Commit | Line | Data |
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826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
26296c48 | 4 | * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
fac6795d | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
91d76f53 | 9 | * |
d14d33bf AM |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
91d76f53 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
18 | */ |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
fac6795d DG |
21 | #include <getopt.h> |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
0bb7724a | 24 | #include <paths.h> |
fac6795d DG |
25 | #include <pthread.h> |
26 | #include <signal.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
331744e3 | 30 | #include <inttypes.h> |
0fdd1e2c | 31 | #include <sys/mman.h> |
b73401da | 32 | #include <sys/mount.h> |
1e307fab | 33 | #include <sys/resource.h> |
fac6795d DG |
34 | #include <sys/socket.h> |
35 | #include <sys/stat.h> | |
36 | #include <sys/types.h> | |
0fdd1e2c | 37 | #include <sys/wait.h> |
5c827ce0 | 38 | #include <urcu/uatomic.h> |
fac6795d | 39 | #include <unistd.h> |
4f0b90ee | 40 | #include <ctype.h> |
fac6795d | 41 | |
990570ed | 42 | #include <common/common.h> |
d27c42b8 | 43 | #include <common/compat/socket.h> |
e8fa9fb0 | 44 | #include <common/compat/getenv.h> |
db758600 DG |
45 | #include <common/defaults.h> |
46 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 47 | #include <common/futex.h> |
00e2e675 | 48 | #include <common/relayd/relayd.h> |
81b86775 | 49 | #include <common/utils.h> |
3ccdf997 | 50 | #include <common/daemonize.h> |
f40ef1d5 | 51 | #include <common/config/session-config.h> |
dcabc190 FD |
52 | #include <common/dynamic-buffer.h> |
53 | #include <lttng/userspace-probe-internal.h> | |
76fcf151 | 54 | #include <lttng/event-internal.h> |
fac6795d | 55 | |
10a8a223 | 56 | #include "lttng-sessiond.h" |
7972aab2 | 57 | #include "buffer-registry.h" |
54d01ffb | 58 | #include "channel.h" |
2f77fc4b | 59 | #include "cmd.h" |
00e2e675 | 60 | #include "consumer.h" |
099e26bd | 61 | #include "context.h" |
54d01ffb | 62 | #include "event.h" |
4771f025 | 63 | #include "kernel.h" |
f1e16794 | 64 | #include "kernel-consumer.h" |
096102bd | 65 | #include "modprobe.h" |
0fdd1e2c | 66 | #include "shm.h" |
1e307fab | 67 | #include "ust-ctl.h" |
00e2e675 | 68 | #include "ust-consumer.h" |
8e68d1c8 | 69 | #include "utils.h" |
4063050c | 70 | #include "fd-limit.h" |
8782cc74 | 71 | #include "health-sessiond.h" |
8ac94142 | 72 | #include "testpoint.h" |
d0b96690 | 73 | #include "ust-thread.h" |
022d91ba | 74 | #include "agent-thread.h" |
fb198a11 | 75 | #include "save.h" |
ef367a93 | 76 | #include "load-session-thread.h" |
b3530820 JG |
77 | #include "notification-thread.h" |
78 | #include "notification-thread-commands.h" | |
db66e574 | 79 | #include "rotation-thread.h" |
0dbc2034 | 80 | #include "lttng-syscall.h" |
7c1d2758 | 81 | #include "agent.h" |
5e97de00 | 82 | #include "ht-cleanup.h" |
e6142f2e | 83 | #include "sessiond-config.h" |
8e319828 | 84 | #include "timer.h" |
ebaeda94 | 85 | |
4fc83d94 PP |
86 | static const char *help_msg = |
87 | #ifdef LTTNG_EMBED_HELP | |
88 | #include <lttng-sessiond.8.h> | |
89 | #else | |
90 | NULL | |
91 | #endif | |
92 | ; | |
93 | ||
fac6795d | 94 | const char *progname; |
1d4b027a | 95 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
0bb7724a | 96 | static pid_t child_ppid; /* Internal parent PID use with daemonize. */ |
c9cb3e7d | 97 | static int lockfile_fd = -1; |
3bd1e081 | 98 | |
0bb7724a DG |
99 | /* Set to 1 when a SIGUSR1 signal is received. */ |
100 | static int recv_child_signal; | |
101 | ||
88076e89 JD |
102 | static struct lttng_kernel_tracer_version kernel_tracer_version; |
103 | static struct lttng_kernel_tracer_abi_version kernel_tracer_abi_version; | |
104 | ||
a23ec3a7 DG |
105 | /* |
106 | * Consumer daemon specific control data. Every value not initialized here is | |
107 | * set to 0 by the static definition. | |
108 | */ | |
3bd1e081 MD |
109 | static struct consumer_data kconsumer_data = { |
110 | .type = LTTNG_CONSUMER_KERNEL, | |
03550b58 MD |
111 | .err_sock = -1, |
112 | .cmd_sock = -1, | |
b3530820 | 113 | .channel_monitor_pipe = -1, |
173af62f DG |
114 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
115 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
116 | .cond = PTHREAD_COND_INITIALIZER, |
117 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 118 | }; |
7753dea8 MD |
119 | static struct consumer_data ustconsumer64_data = { |
120 | .type = LTTNG_CONSUMER64_UST, | |
03550b58 MD |
121 | .err_sock = -1, |
122 | .cmd_sock = -1, | |
b3530820 | 123 | .channel_monitor_pipe = -1, |
173af62f DG |
124 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
125 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
126 | .cond = PTHREAD_COND_INITIALIZER, |
127 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
128 | }; |
129 | static struct consumer_data ustconsumer32_data = { | |
130 | .type = LTTNG_CONSUMER32_UST, | |
03550b58 MD |
131 | .err_sock = -1, |
132 | .cmd_sock = -1, | |
b3530820 | 133 | .channel_monitor_pipe = -1, |
173af62f DG |
134 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
135 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
136 | .cond = PTHREAD_COND_INITIALIZER, |
137 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
138 | }; |
139 | ||
26296c48 JG |
140 | /* Command line options */ |
141 | static const struct option long_options[] = { | |
0f5ea17c JG |
142 | { "client-sock", required_argument, 0, 'c' }, |
143 | { "apps-sock", required_argument, 0, 'a' }, | |
144 | { "kconsumerd-cmd-sock", required_argument, 0, '\0' }, | |
145 | { "kconsumerd-err-sock", required_argument, 0, '\0' }, | |
146 | { "ustconsumerd32-cmd-sock", required_argument, 0, '\0' }, | |
147 | { "ustconsumerd32-err-sock", required_argument, 0, '\0' }, | |
148 | { "ustconsumerd64-cmd-sock", required_argument, 0, '\0' }, | |
149 | { "ustconsumerd64-err-sock", required_argument, 0, '\0' }, | |
150 | { "consumerd32-path", required_argument, 0, '\0' }, | |
151 | { "consumerd32-libdir", required_argument, 0, '\0' }, | |
152 | { "consumerd64-path", required_argument, 0, '\0' }, | |
153 | { "consumerd64-libdir", required_argument, 0, '\0' }, | |
154 | { "daemonize", no_argument, 0, 'd' }, | |
155 | { "background", no_argument, 0, 'b' }, | |
156 | { "sig-parent", no_argument, 0, 'S' }, | |
157 | { "help", no_argument, 0, 'h' }, | |
158 | { "group", required_argument, 0, 'g' }, | |
159 | { "version", no_argument, 0, 'V' }, | |
160 | { "quiet", no_argument, 0, 'q' }, | |
161 | { "verbose", no_argument, 0, 'v' }, | |
162 | { "verbose-consumer", no_argument, 0, '\0' }, | |
163 | { "no-kernel", no_argument, 0, '\0' }, | |
164 | { "pidfile", required_argument, 0, 'p' }, | |
165 | { "agent-tcp-port", required_argument, 0, '\0' }, | |
166 | { "config", required_argument, 0, 'f' }, | |
167 | { "load", required_argument, 0, 'l' }, | |
168 | { "kmod-probes", required_argument, 0, '\0' }, | |
169 | { "extra-kmod-probes", required_argument, 0, '\0' }, | |
26296c48 JG |
170 | { NULL, 0, 0, 0 } |
171 | }; | |
172 | ||
e6142f2e JG |
173 | struct sessiond_config config; |
174 | ||
26296c48 JG |
175 | /* Command line options to ignore from configuration file */ |
176 | static const char *config_ignore_options[] = { "help", "version", "config" }; | |
177 | ||
26c9d55e | 178 | /* Shared between threads */ |
099e26bd | 179 | static int dispatch_thread_exit; |
fac6795d | 180 | |
1d4b027a | 181 | /* Sockets and FDs */ |
a4b35e07 MD |
182 | static int client_sock = -1; |
183 | static int apps_sock = -1; | |
2f77fc4b | 184 | int kernel_tracer_fd = -1; |
76d7553f | 185 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 186 | |
273ea72c DG |
187 | /* |
188 | * Quit pipe for all threads. This permits a single cancellation point | |
189 | * for all threads when receiving an event on the pipe. | |
190 | */ | |
76d7553f | 191 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 192 | |
099e26bd DG |
193 | /* |
194 | * This pipe is used to inform the thread managing application communication | |
195 | * that a command is queued and ready to be processed. | |
196 | */ | |
76d7553f | 197 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 198 | |
d0b96690 DG |
199 | int apps_cmd_notify_pipe[2] = { -1, -1 }; |
200 | ||
1d4b027a | 201 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 202 | static pthread_t apps_thread; |
d0b96690 | 203 | static pthread_t apps_notify_thread; |
099e26bd | 204 | static pthread_t reg_apps_thread; |
1d4b027a | 205 | static pthread_t client_thread; |
7a485870 | 206 | static pthread_t kernel_thread; |
099e26bd | 207 | static pthread_t dispatch_thread; |
44a5e5eb | 208 | static pthread_t health_thread; |
0b2dc8df | 209 | static pthread_t ht_cleanup_thread; |
022d91ba | 210 | static pthread_t agent_reg_thread; |
ef367a93 | 211 | static pthread_t load_session_thread; |
b3530820 | 212 | static pthread_t notification_thread; |
db66e574 | 213 | static pthread_t rotation_thread; |
d086f507 | 214 | static pthread_t timer_thread; |
5eb91c98 | 215 | |
099e26bd DG |
216 | /* |
217 | * UST registration command queue. This queue is tied with a futex and uses a N | |
218 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
219 | * | |
b22c5da8 DG |
220 | * The thread_registration_apps and thread_dispatch_ust_registration uses this |
221 | * queue along with the wait/wake scheme. The thread_manage_apps receives down | |
222 | * the line new application socket and monitors it for any I/O error or clean | |
223 | * close that triggers an unregistration of the application. | |
099e26bd DG |
224 | */ |
225 | static struct ust_cmd_queue ust_cmd_queue; | |
226 | ||
b5541356 DG |
227 | /* |
228 | * Pointer initialized before thread creation. | |
229 | * | |
230 | * This points to the tracing session list containing the session count and a | |
231 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
232 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 233 | * |
d063d709 | 234 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 235 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
236 | */ |
237 | static struct ltt_session_list *session_list_ptr; | |
238 | ||
7753dea8 MD |
239 | int ust_consumerd64_fd = -1; |
240 | int ust_consumerd32_fd = -1; | |
241 | ||
2f77fc4b DG |
242 | static const char *module_proc_lttng = "/proc/lttng"; |
243 | ||
5c827ce0 DG |
244 | /* |
245 | * Consumer daemon state which is changed when spawning it, killing it or in | |
246 | * case of a fatal error. | |
247 | */ | |
248 | enum consumerd_state { | |
249 | CONSUMER_STARTED = 1, | |
250 | CONSUMER_STOPPED = 2, | |
251 | CONSUMER_ERROR = 3, | |
252 | }; | |
253 | ||
254 | /* | |
255 | * This consumer daemon state is used to validate if a client command will be | |
256 | * able to reach the consumer. If not, the client is informed. For instance, | |
257 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
258 | * error to the client. | |
259 | * | |
260 | * The following example shows a possible race condition of this scheme: | |
261 | * | |
262 | * consumer thread error happens | |
263 | * client cmd arrives | |
264 | * client cmd checks state -> still OK | |
265 | * consumer thread exit, sets error | |
266 | * client cmd try to talk to consumer | |
267 | * ... | |
268 | * | |
269 | * However, since the consumer is a different daemon, we have no way of making | |
270 | * sure the command will reach it safely even with this state flag. This is why | |
271 | * we consider that up to the state validation during command processing, the | |
272 | * command is safe. After that, we can not guarantee the correctness of the | |
273 | * client request vis-a-vis the consumer. | |
274 | */ | |
275 | static enum consumerd_state ust_consumerd_state; | |
276 | static enum consumerd_state kernel_consumerd_state; | |
277 | ||
12744796 DG |
278 | /* Set in main() with the current page size. */ |
279 | long page_size; | |
280 | ||
8782cc74 MD |
281 | /* Application health monitoring */ |
282 | struct health_app *health_sessiond; | |
283 | ||
f43f95a9 DG |
284 | /* Am I root or not. */ |
285 | int is_root; /* Set to 1 if the daemon is running as root */ | |
286 | ||
26296c48 JG |
287 | const char * const config_section_name = "sessiond"; |
288 | ||
ef367a93 JG |
289 | /* Load session thread information to operate. */ |
290 | struct load_session_thread_data *load_info; | |
291 | ||
b3530820 JG |
292 | /* Notification thread handle. */ |
293 | struct notification_thread_handle *notification_thread_handle; | |
294 | ||
db66e574 JD |
295 | /* Rotation thread handle. */ |
296 | struct rotation_thread_handle *rotation_thread_handle; | |
297 | ||
7c1d2758 JG |
298 | /* Global hash tables */ |
299 | struct lttng_ht *agent_apps_ht_by_sock = NULL; | |
300 | ||
97bc1426 | 301 | /* |
9cc1ba3b JG |
302 | * The initialization of the session daemon is done in multiple phases. |
303 | * | |
304 | * While all threads are launched near-simultaneously, only some of them | |
305 | * are needed to ensure the session daemon can start to respond to client | |
b3530820 | 306 | * requests. |
9cc1ba3b JG |
307 | * |
308 | * There are two important guarantees that we wish to offer with respect | |
309 | * to the initialisation of the session daemon: | |
310 | * - When the daemonize/background launcher process exits, the sessiond | |
311 | * is fully able to respond to client requests, | |
312 | * - Auto-loaded sessions are visible to clients. | |
313 | * | |
314 | * In order to achieve this, a number of support threads have to be launched | |
315 | * to allow the "client" thread to function properly. Moreover, since the | |
316 | * "load session" thread needs the client thread, we must provide a way | |
317 | * for the "load session" thread to know that the "client" thread is up | |
318 | * and running. | |
319 | * | |
320 | * Hence, the support threads decrement the lttng_sessiond_ready counter | |
321 | * while the "client" threads waits for it to reach 0. Once the "client" thread | |
322 | * unblocks, it posts the message_thread_ready semaphore which allows the | |
323 | * "load session" thread to progress. | |
324 | * | |
325 | * This implies that the "load session" thread is the last to be initialized | |
326 | * and will explicitly call sessiond_signal_parents(), which signals the parents | |
327 | * that the session daemon is fully initialized. | |
328 | * | |
329 | * The four (4) support threads are: | |
330 | * - agent_thread | |
331 | * - notification_thread | |
332 | * - rotation_thread | |
333 | * - health_thread | |
97bc1426 | 334 | */ |
bc4b3ff1 JG |
335 | #define NR_LTTNG_SESSIOND_SUPPORT_THREADS 4 |
336 | int lttng_sessiond_ready = NR_LTTNG_SESSIOND_SUPPORT_THREADS; | |
97bc1426 | 337 | |
5e97de00 JG |
338 | int sessiond_check_thread_quit_pipe(int fd, uint32_t events) |
339 | { | |
340 | return (fd == thread_quit_pipe[0] && (events & LPOLLIN)) ? 1 : 0; | |
341 | } | |
342 | ||
97bc1426 | 343 | /* Notify parents that we are ready for cmd and health check */ |
ef367a93 | 344 | LTTNG_HIDDEN |
9cc1ba3b | 345 | void sessiond_signal_parents(void) |
97bc1426 | 346 | { |
9cc1ba3b JG |
347 | /* |
348 | * Notify parent pid that we are ready to accept command | |
349 | * for client side. This ppid is the one from the | |
350 | * external process that spawned us. | |
351 | */ | |
352 | if (config.sig_parent) { | |
353 | kill(ppid, SIGUSR1); | |
354 | } | |
97bc1426 | 355 | |
9cc1ba3b JG |
356 | /* |
357 | * Notify the parent of the fork() process that we are | |
358 | * ready. | |
359 | */ | |
360 | if (config.daemonize || config.background) { | |
361 | kill(child_ppid, SIGUSR1); | |
97bc1426 MD |
362 | } |
363 | } | |
364 | ||
9cc1ba3b JG |
365 | LTTNG_HIDDEN |
366 | void sessiond_notify_ready(void) | |
367 | { | |
368 | /* | |
524423d6 JG |
369 | * This memory barrier is paired with the one performed by |
370 | * the client thread after it has seen that 'lttng_sessiond_ready' is 0. | |
371 | * | |
372 | * The purpose of these memory barriers is to ensure that all | |
373 | * initialization operations of the various threads that call this | |
374 | * function to signal that they are ready are commited/published | |
375 | * before the client thread can see the 'lttng_sessiond_ready' counter | |
376 | * reach 0. | |
377 | * | |
378 | * Note that this could be a 'write' memory barrier, but a full barrier | |
379 | * is used in case the code using this utility changes. The performance | |
380 | * implications of this choice are minimal since this is a slow path. | |
9cc1ba3b | 381 | */ |
524423d6 JG |
382 | cmm_smp_mb(); |
383 | uatomic_sub(<tng_sessiond_ready, 1); | |
9cc1ba3b JG |
384 | } |
385 | ||
4a15001e MD |
386 | static |
387 | int __sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size, | |
388 | int *a_pipe) | |
5eb91c98 DG |
389 | { |
390 | int ret; | |
391 | ||
d0b96690 | 392 | assert(events); |
5eb91c98 DG |
393 | |
394 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
395 | if (ret < 0) { | |
396 | goto error; | |
397 | } | |
398 | ||
399 | /* Add quit pipe */ | |
4a15001e | 400 | ret = lttng_poll_add(events, a_pipe[0], LPOLLIN | LPOLLERR); |
5eb91c98 DG |
401 | if (ret < 0) { |
402 | goto error; | |
403 | } | |
404 | ||
405 | return 0; | |
406 | ||
407 | error: | |
408 | return ret; | |
409 | } | |
410 | ||
4a15001e MD |
411 | /* |
412 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
413 | */ | |
414 | int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size) | |
415 | { | |
416 | return __sessiond_set_thread_pollset(events, size, thread_quit_pipe); | |
417 | } | |
418 | ||
273ea72c | 419 | /* |
5eb91c98 | 420 | * Init thread quit pipe. |
273ea72c DG |
421 | * |
422 | * Return -1 on error or 0 if all pipes are created. | |
423 | */ | |
4a15001e | 424 | static int __init_thread_quit_pipe(int *a_pipe) |
273ea72c | 425 | { |
730389d9 | 426 | int ret, i; |
273ea72c | 427 | |
4a15001e | 428 | ret = pipe(a_pipe); |
273ea72c | 429 | if (ret < 0) { |
730389d9 | 430 | PERROR("thread quit pipe"); |
273ea72c DG |
431 | goto error; |
432 | } | |
433 | ||
730389d9 | 434 | for (i = 0; i < 2; i++) { |
4a15001e | 435 | ret = fcntl(a_pipe[i], F_SETFD, FD_CLOEXEC); |
730389d9 DG |
436 | if (ret < 0) { |
437 | PERROR("fcntl"); | |
438 | goto error; | |
439 | } | |
440 | } | |
441 | ||
273ea72c DG |
442 | error: |
443 | return ret; | |
444 | } | |
445 | ||
4a15001e MD |
446 | static int init_thread_quit_pipe(void) |
447 | { | |
448 | return __init_thread_quit_pipe(thread_quit_pipe); | |
449 | } | |
450 | ||
099e26bd DG |
451 | /* |
452 | * Stop all threads by closing the thread quit pipe. | |
453 | */ | |
cf3af59e MD |
454 | static void stop_threads(void) |
455 | { | |
5eb91c98 DG |
456 | int ret; |
457 | ||
cf3af59e MD |
458 | /* Stopping all threads */ |
459 | DBG("Terminating all threads"); | |
54d01ffb | 460 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
461 | if (ret < 0) { |
462 | ERR("write error on thread quit pipe"); | |
463 | } | |
464 | ||
099e26bd | 465 | /* Dispatch thread */ |
26c9d55e | 466 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 467 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
468 | } |
469 | ||
e975f9f8 DG |
470 | /* |
471 | * Close every consumer sockets. | |
472 | */ | |
473 | static void close_consumer_sockets(void) | |
474 | { | |
475 | int ret; | |
476 | ||
477 | if (kconsumer_data.err_sock >= 0) { | |
478 | ret = close(kconsumer_data.err_sock); | |
479 | if (ret < 0) { | |
480 | PERROR("kernel consumer err_sock close"); | |
481 | } | |
482 | } | |
483 | if (ustconsumer32_data.err_sock >= 0) { | |
484 | ret = close(ustconsumer32_data.err_sock); | |
485 | if (ret < 0) { | |
a76cbd9f | 486 | PERROR("UST consumerd32 err_sock close"); |
e975f9f8 DG |
487 | } |
488 | } | |
489 | if (ustconsumer64_data.err_sock >= 0) { | |
490 | ret = close(ustconsumer64_data.err_sock); | |
491 | if (ret < 0) { | |
a76cbd9f | 492 | PERROR("UST consumerd64 err_sock close"); |
e975f9f8 DG |
493 | } |
494 | } | |
495 | if (kconsumer_data.cmd_sock >= 0) { | |
496 | ret = close(kconsumer_data.cmd_sock); | |
497 | if (ret < 0) { | |
498 | PERROR("kernel consumer cmd_sock close"); | |
499 | } | |
500 | } | |
501 | if (ustconsumer32_data.cmd_sock >= 0) { | |
502 | ret = close(ustconsumer32_data.cmd_sock); | |
503 | if (ret < 0) { | |
a76cbd9f | 504 | PERROR("UST consumerd32 cmd_sock close"); |
e975f9f8 DG |
505 | } |
506 | } | |
507 | if (ustconsumer64_data.cmd_sock >= 0) { | |
508 | ret = close(ustconsumer64_data.cmd_sock); | |
509 | if (ret < 0) { | |
a76cbd9f | 510 | PERROR("UST consumerd64 cmd_sock close"); |
e975f9f8 DG |
511 | } |
512 | } | |
b3530820 JG |
513 | if (kconsumer_data.channel_monitor_pipe >= 0) { |
514 | ret = close(kconsumer_data.channel_monitor_pipe); | |
515 | if (ret < 0) { | |
516 | PERROR("kernel consumer channel monitor pipe close"); | |
517 | } | |
518 | } | |
519 | if (ustconsumer32_data.channel_monitor_pipe >= 0) { | |
520 | ret = close(ustconsumer32_data.channel_monitor_pipe); | |
521 | if (ret < 0) { | |
522 | PERROR("UST consumerd32 channel monitor pipe close"); | |
523 | } | |
524 | } | |
525 | if (ustconsumer64_data.channel_monitor_pipe >= 0) { | |
526 | ret = close(ustconsumer64_data.channel_monitor_pipe); | |
527 | if (ret < 0) { | |
528 | PERROR("UST consumerd64 channel monitor pipe close"); | |
529 | } | |
530 | } | |
e975f9f8 DG |
531 | } |
532 | ||
4e4714cb JR |
533 | /* |
534 | * Wait on consumer process termination. | |
535 | * | |
536 | * Need to be called with the consumer data lock held or from a context | |
537 | * ensuring no concurrent access to data (e.g: cleanup). | |
538 | */ | |
539 | static void wait_consumer(struct consumer_data *consumer_data) | |
540 | { | |
541 | pid_t ret; | |
542 | int status; | |
543 | ||
544 | if (consumer_data->pid <= 0) { | |
545 | return; | |
546 | } | |
547 | ||
548 | DBG("Waiting for complete teardown of consumerd (PID: %d)", | |
549 | consumer_data->pid); | |
550 | ret = waitpid(consumer_data->pid, &status, 0); | |
551 | if (ret == -1) { | |
552 | PERROR("consumerd waitpid pid: %d", consumer_data->pid) | |
1640c24c | 553 | } else if (!WIFEXITED(status)) { |
4e4714cb JR |
554 | ERR("consumerd termination with error: %d", |
555 | WEXITSTATUS(ret)); | |
556 | } | |
557 | consumer_data->pid = 0; | |
558 | } | |
559 | ||
fac6795d | 560 | /* |
4a15001e | 561 | * Cleanup the session daemon's data structures. |
fac6795d | 562 | */ |
4a15001e | 563 | static void sessiond_cleanup(void) |
fac6795d | 564 | { |
ef599319 | 565 | int ret; |
af9737e9 | 566 | struct ltt_session *sess, *stmp; |
fac6795d | 567 | |
4a15001e | 568 | DBG("Cleanup sessiond"); |
e07ae692 | 569 | |
4e449f3f MD |
570 | /* |
571 | * Close the thread quit pipe. It has already done its job, | |
572 | * since we are now called. | |
573 | */ | |
2f77fc4b DG |
574 | utils_close_pipe(thread_quit_pipe); |
575 | ||
c9a2957d JG |
576 | ret = remove(config.pid_file_path.value); |
577 | if (ret < 0) { | |
578 | PERROR("remove pidfile %s", config.pid_file_path.value); | |
35f90c40 DG |
579 | } |
580 | ||
e6142f2e JG |
581 | DBG("Removing sessiond and consumerd content of directory %s", |
582 | config.rundir.value); | |
8c6c56c2 MD |
583 | |
584 | /* sessiond */ | |
e6142f2e JG |
585 | DBG("Removing %s", config.pid_file_path.value); |
586 | (void) unlink(config.pid_file_path.value); | |
8c6c56c2 | 587 | |
e6142f2e JG |
588 | DBG("Removing %s", config.agent_port_file_path.value); |
589 | (void) unlink(config.agent_port_file_path.value); | |
cd9290dd | 590 | |
8c6c56c2 | 591 | /* kconsumerd */ |
e6142f2e JG |
592 | DBG("Removing %s", kconsumer_data.err_unix_sock_path); |
593 | (void) unlink(kconsumer_data.err_unix_sock_path); | |
594 | ||
595 | DBG("Removing directory %s", config.kconsumerd_path.value); | |
596 | (void) rmdir(config.kconsumerd_path.value); | |
8c6c56c2 MD |
597 | |
598 | /* ust consumerd 32 */ | |
e6142f2e JG |
599 | DBG("Removing %s", config.consumerd32_err_unix_sock_path.value); |
600 | (void) unlink(config.consumerd32_err_unix_sock_path.value); | |
601 | ||
602 | DBG("Removing directory %s", config.consumerd32_path.value); | |
603 | (void) rmdir(config.consumerd32_path.value); | |
8c6c56c2 MD |
604 | |
605 | /* ust consumerd 64 */ | |
e6142f2e JG |
606 | DBG("Removing %s", config.consumerd64_err_unix_sock_path.value); |
607 | (void) unlink(config.consumerd64_err_unix_sock_path.value); | |
608 | ||
609 | DBG("Removing directory %s", config.consumerd64_path.value); | |
610 | (void) rmdir(config.consumerd64_path.value); | |
5461b305 | 611 | |
99bab54f | 612 | DBG("Cleaning up all sessions"); |
fac6795d | 613 | |
b5541356 | 614 | /* Destroy session list mutex */ |
273ea72c DG |
615 | if (session_list_ptr != NULL) { |
616 | pthread_mutex_destroy(&session_list_ptr->lock); | |
617 | ||
618 | /* Cleanup ALL session */ | |
54d01ffb DG |
619 | cds_list_for_each_entry_safe(sess, stmp, |
620 | &session_list_ptr->head, list) { | |
90936dcf JD |
621 | cmd_destroy_session(sess, kernel_poll_pipe[1], |
622 | notification_thread_handle); | |
273ea72c DG |
623 | } |
624 | } | |
625 | ||
4e4714cb JR |
626 | wait_consumer(&kconsumer_data); |
627 | wait_consumer(&ustconsumer64_data); | |
628 | wait_consumer(&ustconsumer32_data); | |
629 | ||
6a4e4039 JG |
630 | DBG("Cleaning up all agent apps"); |
631 | agent_app_ht_clean(); | |
632 | ||
099e26bd | 633 | DBG("Closing all UST sockets"); |
56fff090 | 634 | ust_app_clean_list(); |
7972aab2 | 635 | buffer_reg_destroy_registries(); |
099e26bd | 636 | |
e6142f2e | 637 | if (is_root && !config.no_kernel) { |
4fba7219 | 638 | DBG2("Closing kernel fd"); |
a4b35e07 | 639 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
640 | ret = close(kernel_tracer_fd); |
641 | if (ret) { | |
642 | PERROR("close"); | |
643 | } | |
a4b35e07 | 644 | } |
2f50c8a3 | 645 | DBG("Unloading kernel modules"); |
096102bd | 646 | modprobe_remove_lttng_all(); |
834978fd | 647 | free(syscall_table); |
2f50c8a3 | 648 | } |
2f77fc4b | 649 | |
e975f9f8 DG |
650 | close_consumer_sockets(); |
651 | ||
ef367a93 JG |
652 | if (load_info) { |
653 | load_session_destroy_data(load_info); | |
654 | free(load_info); | |
655 | } | |
656 | ||
c9cb3e7d JG |
657 | /* |
658 | * We do NOT rmdir rundir because there are other processes | |
659 | * using it, for instance lttng-relayd, which can start in | |
660 | * parallel with this teardown. | |
661 | */ | |
4a15001e MD |
662 | } |
663 | ||
664 | /* | |
665 | * Cleanup the daemon's option data structures. | |
666 | */ | |
667 | static void sessiond_cleanup_options(void) | |
668 | { | |
669 | DBG("Cleaning up options"); | |
670 | ||
e6142f2e | 671 | sessiond_config_fini(&config); |
c9cb3e7d | 672 | |
7567352f | 673 | run_as_destroy_worker(); |
fac6795d DG |
674 | } |
675 | ||
e065084a | 676 | /* |
d063d709 | 677 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 678 | * |
d063d709 | 679 | * Return lttcomm error code. |
e065084a DG |
680 | */ |
681 | static int send_unix_sock(int sock, void *buf, size_t len) | |
682 | { | |
683 | /* Check valid length */ | |
c617c0c6 | 684 | if (len == 0) { |
e065084a DG |
685 | return -1; |
686 | } | |
687 | ||
688 | return lttcomm_send_unix_sock(sock, buf, len); | |
689 | } | |
690 | ||
5461b305 | 691 | /* |
d063d709 | 692 | * Free memory of a command context structure. |
5461b305 | 693 | */ |
a2fb29a5 | 694 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 695 | { |
a2fb29a5 DG |
696 | DBG("Clean command context structure"); |
697 | if (*cmd_ctx) { | |
698 | if ((*cmd_ctx)->llm) { | |
699 | free((*cmd_ctx)->llm); | |
5461b305 | 700 | } |
a2fb29a5 DG |
701 | if ((*cmd_ctx)->lsm) { |
702 | free((*cmd_ctx)->lsm); | |
5461b305 | 703 | } |
a2fb29a5 DG |
704 | free(*cmd_ctx); |
705 | *cmd_ctx = NULL; | |
5461b305 DG |
706 | } |
707 | } | |
708 | ||
fac6795d | 709 | /* |
0fdd1e2c | 710 | * Notify UST applications using the shm mmap futex. |
fac6795d | 711 | */ |
0fdd1e2c | 712 | static int notify_ust_apps(int active) |
fac6795d | 713 | { |
0fdd1e2c | 714 | char *wait_shm_mmap; |
fac6795d | 715 | |
0fdd1e2c | 716 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 717 | |
0fdd1e2c | 718 | /* See shm.c for this call implying mmap, shm and futex calls */ |
e6142f2e | 719 | wait_shm_mmap = shm_ust_get_mmap(config.wait_shm_path.value, is_root); |
0fdd1e2c | 720 | if (wait_shm_mmap == NULL) { |
fac6795d DG |
721 | goto error; |
722 | } | |
723 | ||
0fdd1e2c DG |
724 | /* Wake waiting process */ |
725 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
726 | ||
727 | /* Apps notified successfully */ | |
728 | return 0; | |
fac6795d DG |
729 | |
730 | error: | |
0fdd1e2c | 731 | return -1; |
fac6795d DG |
732 | } |
733 | ||
e065084a | 734 | /* |
d063d709 DG |
735 | * Setup the outgoing data buffer for the response (llm) by allocating the |
736 | * right amount of memory and copying the original information from the lsm | |
737 | * structure. | |
ca95a216 | 738 | * |
6e10c9b9 | 739 | * Return 0 on success, negative value on error. |
ca95a216 | 740 | */ |
6e10c9b9 PP |
741 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, |
742 | const void *payload_buf, size_t payload_len, | |
743 | const void *cmd_header_buf, size_t cmd_header_len) | |
ca95a216 | 744 | { |
6e10c9b9 PP |
745 | int ret = 0; |
746 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
747 | const size_t cmd_header_offset = header_len; | |
748 | const size_t payload_offset = cmd_header_offset + cmd_header_len; | |
749 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
ca95a216 | 750 | |
6e10c9b9 | 751 | cmd_ctx->llm = zmalloc(total_msg_size); |
5461b305 | 752 | |
5461b305 | 753 | if (cmd_ctx->llm == NULL) { |
76d7553f | 754 | PERROR("zmalloc"); |
5461b305 | 755 | ret = -ENOMEM; |
6e10c9b9 | 756 | goto end; |
ca95a216 DG |
757 | } |
758 | ||
5461b305 DG |
759 | /* Copy common data */ |
760 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 761 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
6e10c9b9 PP |
762 | cmd_ctx->llm->cmd_header_size = cmd_header_len; |
763 | cmd_ctx->llm->data_size = payload_len; | |
764 | cmd_ctx->lttng_msg_size = total_msg_size; | |
5461b305 | 765 | |
6e10c9b9 | 766 | /* Copy command header */ |
b4e3ceb9 PP |
767 | if (cmd_header_len) { |
768 | memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf, | |
769 | cmd_header_len); | |
770 | } | |
5461b305 | 771 | |
6e10c9b9 | 772 | /* Copy payload */ |
b4e3ceb9 PP |
773 | if (payload_len) { |
774 | memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf, | |
775 | payload_len); | |
776 | } | |
ca95a216 | 777 | |
6e10c9b9 | 778 | end: |
ca95a216 DG |
779 | return ret; |
780 | } | |
781 | ||
6e10c9b9 PP |
782 | /* |
783 | * Version of setup_lttng_msg() without command header. | |
784 | */ | |
785 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
786 | void *payload_buf, size_t payload_len) | |
787 | { | |
788 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
789 | } | |
7a485870 | 790 | /* |
5eb91c98 | 791 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 792 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 793 | */ |
5eb91c98 | 794 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 795 | { |
5eb91c98 | 796 | int ret; |
7a485870 DG |
797 | struct ltt_session *session; |
798 | struct ltt_kernel_channel *channel; | |
799 | ||
5eb91c98 | 800 | DBG("Updating kernel poll set"); |
7a485870 | 801 | |
54d01ffb | 802 | session_lock_list(); |
b5541356 | 803 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 804 | session_lock(session); |
7a485870 | 805 | if (session->kernel_session == NULL) { |
54d01ffb | 806 | session_unlock(session); |
7a485870 DG |
807 | continue; |
808 | } | |
7a485870 | 809 | |
54d01ffb DG |
810 | cds_list_for_each_entry(channel, |
811 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
812 | /* Add channel fd to the kernel poll set */ |
813 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
814 | if (ret < 0) { | |
54d01ffb | 815 | session_unlock(session); |
5eb91c98 DG |
816 | goto error; |
817 | } | |
818 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 819 | } |
54d01ffb | 820 | session_unlock(session); |
7a485870 | 821 | } |
54d01ffb | 822 | session_unlock_list(); |
7a485870 | 823 | |
5eb91c98 | 824 | return 0; |
7a485870 DG |
825 | |
826 | error: | |
54d01ffb | 827 | session_unlock_list(); |
7a485870 DG |
828 | return -1; |
829 | } | |
830 | ||
831 | /* | |
54d01ffb | 832 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 833 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 834 | * |
d063d709 | 835 | * Useful for CPU hotplug feature. |
7a485870 | 836 | */ |
7f032058 | 837 | static int update_kernel_stream(int fd) |
7a485870 DG |
838 | { |
839 | int ret = 0; | |
840 | struct ltt_session *session; | |
173af62f | 841 | struct ltt_kernel_session *ksess; |
7a485870 DG |
842 | struct ltt_kernel_channel *channel; |
843 | ||
844 | DBG("Updating kernel streams for channel fd %d", fd); | |
845 | ||
54d01ffb | 846 | session_lock_list(); |
b5541356 | 847 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 848 | session_lock(session); |
7a485870 | 849 | if (session->kernel_session == NULL) { |
54d01ffb | 850 | session_unlock(session); |
7a485870 DG |
851 | continue; |
852 | } | |
173af62f | 853 | ksess = session->kernel_session; |
d9800920 | 854 | |
4a15001e MD |
855 | cds_list_for_each_entry(channel, |
856 | &ksess->channel_list.head, list) { | |
857 | struct lttng_ht_iter iter; | |
858 | struct consumer_socket *socket; | |
d9800920 | 859 | |
4a15001e MD |
860 | if (channel->fd != fd) { |
861 | continue; | |
862 | } | |
863 | DBG("Channel found, updating kernel streams"); | |
864 | ret = kernel_open_channel_stream(channel); | |
865 | if (ret < 0) { | |
866 | goto error; | |
867 | } | |
868 | /* Update the stream global counter */ | |
869 | ksess->stream_count_global += ret; | |
870 | ||
871 | /* | |
872 | * Have we already sent fds to the consumer? If yes, it | |
873 | * means that tracing is started so it is safe to send | |
874 | * our updated stream fds. | |
875 | */ | |
876 | if (ksess->consumer_fds_sent != 1 | |
877 | || ksess->consumer == NULL) { | |
878 | ret = -1; | |
879 | goto error; | |
880 | } | |
881 | ||
882 | rcu_read_lock(); | |
883 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, | |
884 | &iter.iter, socket, node.node) { | |
885 | pthread_mutex_lock(socket->lock); | |
1fc1b7c8 | 886 | ret = kernel_consumer_send_channel_streams(socket, |
4a15001e MD |
887 | channel, ksess, |
888 | session->output_traces ? 1 : 0); | |
889 | pthread_mutex_unlock(socket->lock); | |
890 | if (ret < 0) { | |
e7fe706f | 891 | rcu_read_unlock(); |
4a15001e | 892 | goto error; |
7a485870 | 893 | } |
7a485870 | 894 | } |
4a15001e | 895 | rcu_read_unlock(); |
7a485870 | 896 | } |
54d01ffb | 897 | session_unlock(session); |
7a485870 | 898 | } |
54d01ffb | 899 | session_unlock_list(); |
b3c750d2 | 900 | return ret; |
7a485870 | 901 | |
b3c750d2 | 902 | error: |
54d01ffb DG |
903 | session_unlock(session); |
904 | session_unlock_list(); | |
7a485870 DG |
905 | return ret; |
906 | } | |
907 | ||
487cf67c | 908 | /* |
ffe60014 DG |
909 | * For each tracing session, update newly registered apps. The session list |
910 | * lock MUST be acquired before calling this. | |
487cf67c DG |
911 | */ |
912 | static void update_ust_app(int app_sock) | |
913 | { | |
914 | struct ltt_session *sess, *stmp; | |
915 | ||
fdadac08 DG |
916 | /* Consumer is in an ERROR state. Stop any application update. */ |
917 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
918 | /* Stop the update process since the consumer is dead. */ | |
919 | return; | |
920 | } | |
921 | ||
487cf67c DG |
922 | /* For all tracing session(s) */ |
923 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
a9ad0c8f MD |
924 | struct ust_app *app; |
925 | ||
4ee14516 | 926 | session_lock(sess); |
a9ad0c8f MD |
927 | if (!sess->ust_session) { |
928 | goto unlock_session; | |
929 | } | |
930 | ||
931 | rcu_read_lock(); | |
932 | assert(app_sock >= 0); | |
933 | app = ust_app_find_by_sock(app_sock); | |
934 | if (app == NULL) { | |
935 | /* | |
936 | * Application can be unregistered before so | |
937 | * this is possible hence simply stopping the | |
938 | * update. | |
939 | */ | |
940 | DBG3("UST app update failed to find app sock %d", | |
941 | app_sock); | |
942 | goto unlock_rcu; | |
421cb601 | 943 | } |
a9ad0c8f MD |
944 | ust_app_global_update(sess->ust_session, app); |
945 | unlock_rcu: | |
946 | rcu_read_unlock(); | |
947 | unlock_session: | |
4ee14516 | 948 | session_unlock(sess); |
487cf67c DG |
949 | } |
950 | } | |
951 | ||
7a485870 | 952 | /* |
d063d709 | 953 | * This thread manage event coming from the kernel. |
7a485870 | 954 | * |
d063d709 DG |
955 | * Features supported in this thread: |
956 | * -) CPU Hotplug | |
7a485870 DG |
957 | */ |
958 | static void *thread_manage_kernel(void *data) | |
959 | { | |
139ac872 | 960 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 961 | uint32_t revents, nb_fd; |
7a485870 | 962 | char tmp; |
5eb91c98 | 963 | struct lttng_poll_event events; |
7a485870 | 964 | |
6993eeb3 | 965 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 966 | |
6c71277b | 967 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL); |
927ca06a | 968 | |
d5d63bf1 DG |
969 | /* |
970 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 971 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 972 | */ |
6d737ce4 | 973 | lttng_poll_init(&events); |
d5d63bf1 | 974 | |
e547b070 | 975 | if (testpoint(sessiond_thread_manage_kernel)) { |
6993eeb3 CB |
976 | goto error_testpoint; |
977 | } | |
8ac94142 | 978 | |
840cb59c | 979 | health_code_update(); |
44a5e5eb | 980 | |
e547b070 | 981 | if (testpoint(sessiond_thread_manage_kernel_before_loop)) { |
d21b0d71 | 982 | goto error_testpoint; |
6993eeb3 CB |
983 | } |
984 | ||
7a485870 | 985 | while (1) { |
840cb59c | 986 | health_code_update(); |
44a5e5eb | 987 | |
7a485870 | 988 | if (update_poll_flag == 1) { |
d21b0d71 DG |
989 | /* Clean events object. We are about to populate it again. */ |
990 | lttng_poll_clean(&events); | |
991 | ||
d0b96690 | 992 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
993 | if (ret < 0) { |
994 | goto error_poll_create; | |
995 | } | |
996 | ||
997 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
998 | if (ret < 0) { | |
999 | goto error; | |
1000 | } | |
5f822d0a | 1001 | |
d21b0d71 | 1002 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
1003 | ret = update_kernel_poll(&events); |
1004 | if (ret < 0) { | |
7a485870 DG |
1005 | goto error; |
1006 | } | |
1007 | update_poll_flag = 0; | |
1008 | } | |
1009 | ||
7fa2082e | 1010 | DBG("Thread kernel polling"); |
7a485870 DG |
1011 | |
1012 | /* Poll infinite value of time */ | |
88f2b785 | 1013 | restart: |
a78af745 | 1014 | health_poll_entry(); |
5eb91c98 | 1015 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
1016 | DBG("Thread kernel return from poll on %d fds", |
1017 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 1018 | health_poll_exit(); |
7a485870 | 1019 | if (ret < 0) { |
88f2b785 MD |
1020 | /* |
1021 | * Restart interrupted system call. | |
1022 | */ | |
1023 | if (errno == EINTR) { | |
1024 | goto restart; | |
1025 | } | |
7a485870 DG |
1026 | goto error; |
1027 | } else if (ret == 0) { | |
1028 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
1029 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
1030 | "This should not have happened! Continuing..."); | |
7a485870 DG |
1031 | continue; |
1032 | } | |
1033 | ||
0d9c5d77 DG |
1034 | nb_fd = ret; |
1035 | ||
5eb91c98 DG |
1036 | for (i = 0; i < nb_fd; i++) { |
1037 | /* Fetch once the poll data */ | |
1038 | revents = LTTNG_POLL_GETEV(&events, i); | |
1039 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 1040 | |
840cb59c | 1041 | health_code_update(); |
44a5e5eb | 1042 | |
fd20dac9 MD |
1043 | if (!revents) { |
1044 | /* No activity for this FD (poll implementation). */ | |
1045 | continue; | |
1046 | } | |
1047 | ||
5eb91c98 | 1048 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1049 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1050 | if (ret) { |
139ac872 MD |
1051 | err = 0; |
1052 | goto exit; | |
5eb91c98 | 1053 | } |
7a485870 | 1054 | |
5eb91c98 | 1055 | /* Check for data on kernel pipe */ |
03e43155 MD |
1056 | if (revents & LPOLLIN) { |
1057 | if (pollfd == kernel_poll_pipe[0]) { | |
1058 | (void) lttng_read(kernel_poll_pipe[0], | |
1059 | &tmp, 1); | |
1060 | /* | |
1061 | * Ret value is useless here, if this pipe gets any actions an | |
1062 | * update is required anyway. | |
1063 | */ | |
1064 | update_poll_flag = 1; | |
1065 | continue; | |
1066 | } else { | |
1067 | /* | |
1068 | * New CPU detected by the kernel. Adding kernel stream to | |
1069 | * kernel session and updating the kernel consumer | |
1070 | */ | |
7f032058 | 1071 | ret = update_kernel_stream(pollfd); |
5eb91c98 DG |
1072 | if (ret < 0) { |
1073 | continue; | |
1074 | } | |
1075 | break; | |
7a485870 | 1076 | } |
03e43155 MD |
1077 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1078 | update_poll_flag = 1; | |
1079 | continue; | |
1080 | } else { | |
1081 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1082 | goto error; | |
7a485870 DG |
1083 | } |
1084 | } | |
1085 | } | |
1086 | ||
139ac872 | 1087 | exit: |
7a485870 | 1088 | error: |
5eb91c98 | 1089 | lttng_poll_clean(&events); |
76d7553f | 1090 | error_poll_create: |
6993eeb3 | 1091 | error_testpoint: |
6620da75 DG |
1092 | utils_close_pipe(kernel_poll_pipe); |
1093 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 1094 | if (err) { |
840cb59c | 1095 | health_error(); |
139ac872 | 1096 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
1097 | WARN("Kernel thread died unexpectedly. " |
1098 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 1099 | } |
8782cc74 | 1100 | health_unregister(health_sessiond); |
76d7553f | 1101 | DBG("Kernel thread dying"); |
7a485870 DG |
1102 | return NULL; |
1103 | } | |
1104 | ||
a23ec3a7 DG |
1105 | /* |
1106 | * Signal pthread condition of the consumer data that the thread. | |
1107 | */ | |
1108 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
1109 | { | |
1110 | pthread_mutex_lock(&data->cond_mutex); | |
1111 | ||
1112 | /* | |
1113 | * The state is set before signaling. It can be any value, it's the waiter | |
1114 | * job to correctly interpret this condition variable associated to the | |
1115 | * consumer pthread_cond. | |
1116 | * | |
1117 | * A value of 0 means that the corresponding thread of the consumer data | |
1118 | * was not started. 1 indicates that the thread has started and is ready | |
1119 | * for action. A negative value means that there was an error during the | |
1120 | * thread bootstrap. | |
1121 | */ | |
1122 | data->consumer_thread_is_ready = state; | |
1123 | (void) pthread_cond_signal(&data->cond); | |
1124 | ||
1125 | pthread_mutex_unlock(&data->cond_mutex); | |
1126 | } | |
1127 | ||
1d4b027a | 1128 | /* |
3bd1e081 | 1129 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 1130 | */ |
3bd1e081 | 1131 | static void *thread_manage_consumer(void *data) |
1d4b027a | 1132 | { |
42fc1d0b | 1133 | int sock = -1, i, ret, pollfd, err = -1, should_quit = 0; |
5eb91c98 | 1134 | uint32_t revents, nb_fd; |
1d4b027a | 1135 | enum lttcomm_return_code code; |
5eb91c98 | 1136 | struct lttng_poll_event events; |
3bd1e081 | 1137 | struct consumer_data *consumer_data = data; |
b3530820 | 1138 | struct consumer_socket *cmd_socket_wrapper = NULL; |
1d4b027a | 1139 | |
3bd1e081 | 1140 | DBG("[thread] Manage consumer started"); |
1d4b027a | 1141 | |
34c1e15a MD |
1142 | rcu_register_thread(); |
1143 | rcu_thread_online(); | |
1144 | ||
6c71277b | 1145 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER); |
927ca06a | 1146 | |
855060f8 | 1147 | health_code_update(); |
9449cc75 | 1148 | |
5eb91c98 | 1149 | /* |
331744e3 JD |
1150 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
1151 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 1152 | */ |
331744e3 | 1153 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 1154 | if (ret < 0) { |
76d7553f | 1155 | goto error_poll; |
5eb91c98 | 1156 | } |
273ea72c | 1157 | |
edb8b045 DG |
1158 | /* |
1159 | * The error socket here is already in a listening state which was done | |
1160 | * just before spawning this thread to avoid a race between the consumer | |
1161 | * daemon exec trying to connect and the listen() call. | |
1162 | */ | |
3bd1e081 | 1163 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
1164 | if (ret < 0) { |
1165 | goto error; | |
1166 | } | |
1167 | ||
840cb59c | 1168 | health_code_update(); |
44a5e5eb | 1169 | |
331744e3 | 1170 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1171 | restart: |
a78af745 | 1172 | health_poll_entry(); |
8ac94142 | 1173 | |
e547b070 | 1174 | if (testpoint(sessiond_thread_manage_consumer)) { |
6993eeb3 CB |
1175 | goto error; |
1176 | } | |
8ac94142 | 1177 | |
5eb91c98 | 1178 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1179 | health_poll_exit(); |
273ea72c | 1180 | if (ret < 0) { |
88f2b785 MD |
1181 | /* |
1182 | * Restart interrupted system call. | |
1183 | */ | |
1184 | if (errno == EINTR) { | |
1185 | goto restart; | |
1186 | } | |
273ea72c DG |
1187 | goto error; |
1188 | } | |
1189 | ||
0d9c5d77 DG |
1190 | nb_fd = ret; |
1191 | ||
5eb91c98 DG |
1192 | for (i = 0; i < nb_fd; i++) { |
1193 | /* Fetch once the poll data */ | |
1194 | revents = LTTNG_POLL_GETEV(&events, i); | |
1195 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1196 | ||
840cb59c | 1197 | health_code_update(); |
44a5e5eb | 1198 | |
fd20dac9 MD |
1199 | if (!revents) { |
1200 | /* No activity for this FD (poll implementation). */ | |
1201 | continue; | |
1202 | } | |
1203 | ||
5eb91c98 | 1204 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1205 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1206 | if (ret) { |
139ac872 MD |
1207 | err = 0; |
1208 | goto exit; | |
5eb91c98 DG |
1209 | } |
1210 | ||
1211 | /* Event on the registration socket */ | |
3bd1e081 | 1212 | if (pollfd == consumer_data->err_sock) { |
03e43155 MD |
1213 | if (revents & LPOLLIN) { |
1214 | continue; | |
1215 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1216 | ERR("consumer err socket poll error"); |
5eb91c98 | 1217 | goto error; |
03e43155 MD |
1218 | } else { |
1219 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1220 | goto error; | |
5eb91c98 DG |
1221 | } |
1222 | } | |
273ea72c DG |
1223 | } |
1224 | ||
3bd1e081 | 1225 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1226 | if (sock < 0) { |
1227 | goto error; | |
1228 | } | |
1229 | ||
b662582b DG |
1230 | /* |
1231 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
1232 | * show must go on. | |
1233 | */ | |
1234 | (void) utils_set_fd_cloexec(sock); | |
1235 | ||
840cb59c | 1236 | health_code_update(); |
44a5e5eb | 1237 | |
3bd1e081 | 1238 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1239 | |
712ea556 | 1240 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1241 | ret = lttcomm_recv_unix_sock(sock, &code, |
1242 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1243 | if (ret <= 0) { |
1244 | goto error; | |
1245 | } | |
1246 | ||
840cb59c | 1247 | health_code_update(); |
b3530820 | 1248 | if (code != LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
3bd1e081 | 1249 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1250 | lttcomm_get_readable_code(-code)); |
1251 | goto error; | |
1252 | } | |
1253 | ||
b3530820 JG |
1254 | /* Connect both command and metadata sockets. */ |
1255 | consumer_data->cmd_sock = | |
1256 | lttcomm_connect_unix_sock( | |
1257 | consumer_data->cmd_unix_sock_path); | |
1258 | consumer_data->metadata_fd = | |
1259 | lttcomm_connect_unix_sock( | |
1260 | consumer_data->cmd_unix_sock_path); | |
1261 | if (consumer_data->cmd_sock < 0 || consumer_data->metadata_fd < 0) { | |
1262 | PERROR("consumer connect cmd socket"); | |
1263 | /* On error, signal condition and quit. */ | |
1264 | signal_consumer_condition(consumer_data, -1); | |
1265 | goto error; | |
1266 | } | |
1267 | ||
1268 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; | |
1269 | ||
1270 | /* Create metadata socket lock. */ | |
1271 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1272 | if (consumer_data->metadata_sock.lock == NULL) { | |
1273 | PERROR("zmalloc pthread mutex"); | |
1274 | goto error; | |
1275 | } | |
1276 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1277 | ||
1278 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); | |
1279 | DBG("Consumer metadata socket ready (fd: %d)", | |
1280 | consumer_data->metadata_fd); | |
1281 | ||
1282 | /* | |
1283 | * Remove the consumerd error sock since we've established a connection. | |
1284 | */ | |
3bd1e081 | 1285 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1286 | if (ret < 0) { |
72079cae DG |
1287 | goto error; |
1288 | } | |
1289 | ||
331744e3 | 1290 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1291 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1292 | if (ret < 0) { | |
72079cae | 1293 | goto error; |
5eb91c98 DG |
1294 | } |
1295 | ||
331744e3 | 1296 | /* Add metadata socket that is successfully connected. */ |
4ce514c4 | 1297 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, |
331744e3 JD |
1298 | LPOLLIN | LPOLLRDHUP); |
1299 | if (ret < 0) { | |
1300 | goto error; | |
1301 | } | |
1302 | ||
840cb59c | 1303 | health_code_update(); |
44a5e5eb | 1304 | |
b3530820 | 1305 | /* |
62c43103 | 1306 | * Transfer the write-end of the channel monitoring and rotate pipe |
92816cc3 | 1307 | * to the consumer by issuing a SET_CHANNEL_MONITOR_PIPE command. |
b3530820 JG |
1308 | */ |
1309 | cmd_socket_wrapper = consumer_allocate_socket(&consumer_data->cmd_sock); | |
1310 | if (!cmd_socket_wrapper) { | |
1311 | goto error; | |
1312 | } | |
3e4dc117 | 1313 | cmd_socket_wrapper->lock = &consumer_data->lock; |
b3530820 JG |
1314 | |
1315 | ret = consumer_send_channel_monitor_pipe(cmd_socket_wrapper, | |
1316 | consumer_data->channel_monitor_pipe); | |
1317 | if (ret) { | |
1318 | goto error; | |
1319 | } | |
62c43103 | 1320 | |
b3530820 JG |
1321 | /* Discard the socket wrapper as it is no longer needed. */ |
1322 | consumer_destroy_socket(cmd_socket_wrapper); | |
1323 | cmd_socket_wrapper = NULL; | |
1324 | ||
1325 | /* The thread is completely initialized, signal that it is ready. */ | |
1326 | signal_consumer_condition(consumer_data, 1); | |
1327 | ||
331744e3 | 1328 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1329 | restart_poll: |
331744e3 | 1330 | while (1) { |
42fc1d0b DG |
1331 | health_code_update(); |
1332 | ||
1333 | /* Exit the thread because the thread quit pipe has been triggered. */ | |
1334 | if (should_quit) { | |
1335 | /* Not a health error. */ | |
1336 | err = 0; | |
1337 | goto exit; | |
1338 | } | |
1339 | ||
331744e3 JD |
1340 | health_poll_entry(); |
1341 | ret = lttng_poll_wait(&events, -1); | |
1342 | health_poll_exit(); | |
1343 | if (ret < 0) { | |
1344 | /* | |
1345 | * Restart interrupted system call. | |
1346 | */ | |
1347 | if (errno == EINTR) { | |
1348 | goto restart_poll; | |
1349 | } | |
1350 | goto error; | |
88f2b785 | 1351 | } |
72079cae | 1352 | |
331744e3 | 1353 | nb_fd = ret; |
0d9c5d77 | 1354 | |
331744e3 JD |
1355 | for (i = 0; i < nb_fd; i++) { |
1356 | /* Fetch once the poll data */ | |
1357 | revents = LTTNG_POLL_GETEV(&events, i); | |
1358 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1359 | |
331744e3 | 1360 | health_code_update(); |
44a5e5eb | 1361 | |
fd20dac9 MD |
1362 | if (!revents) { |
1363 | /* No activity for this FD (poll implementation). */ | |
1364 | continue; | |
1365 | } | |
1366 | ||
42fc1d0b DG |
1367 | /* |
1368 | * Thread quit pipe has been triggered, flag that we should stop | |
1369 | * but continue the current loop to handle potential data from | |
1370 | * consumer. | |
1371 | */ | |
1372 | should_quit = sessiond_check_thread_quit_pipe(pollfd, revents); | |
5eb91c98 | 1373 | |
331744e3 JD |
1374 | if (pollfd == sock) { |
1375 | /* Event on the consumerd socket */ | |
03e43155 MD |
1376 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
1377 | && !(revents & LPOLLIN)) { | |
331744e3 JD |
1378 | ERR("consumer err socket second poll error"); |
1379 | goto error; | |
1380 | } | |
1381 | health_code_update(); | |
1382 | /* Wait for any kconsumerd error */ | |
1383 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1384 | sizeof(enum lttcomm_return_code)); | |
1385 | if (ret <= 0) { | |
1386 | ERR("consumer closed the command socket"); | |
1387 | goto error; | |
1388 | } | |
1389 | ||
1390 | ERR("consumer return code : %s", | |
1391 | lttcomm_get_readable_code(-code)); | |
1392 | ||
1393 | goto exit; | |
4ce514c4 | 1394 | } else if (pollfd == consumer_data->metadata_fd) { |
03e43155 MD |
1395 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
1396 | && !(revents & LPOLLIN)) { | |
1397 | ERR("consumer err metadata socket second poll error"); | |
1398 | goto error; | |
1399 | } | |
331744e3 JD |
1400 | /* UST metadata requests */ |
1401 | ret = ust_consumer_metadata_request( | |
1402 | &consumer_data->metadata_sock); | |
1403 | if (ret < 0) { | |
1404 | ERR("Handling metadata request"); | |
1405 | goto error; | |
1406 | } | |
5eb91c98 | 1407 | } |
42fc1d0b | 1408 | /* No need for an else branch all FDs are tested prior. */ |
5eb91c98 | 1409 | } |
331744e3 | 1410 | health_code_update(); |
5eb91c98 DG |
1411 | } |
1412 | ||
139ac872 | 1413 | exit: |
1d4b027a | 1414 | error: |
fdadac08 DG |
1415 | /* |
1416 | * We lock here because we are about to close the sockets and some other | |
92db7cdc DG |
1417 | * thread might be using them so get exclusive access which will abort all |
1418 | * other consumer command by other threads. | |
fdadac08 DG |
1419 | */ |
1420 | pthread_mutex_lock(&consumer_data->lock); | |
1421 | ||
5c827ce0 DG |
1422 | /* Immediately set the consumerd state to stopped */ |
1423 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1424 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1425 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1426 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1427 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1428 | } else { | |
1429 | /* Code flow error... */ | |
1430 | assert(0); | |
1431 | } | |
1432 | ||
76d7553f MD |
1433 | if (consumer_data->err_sock >= 0) { |
1434 | ret = close(consumer_data->err_sock); | |
1435 | if (ret) { | |
1436 | PERROR("close"); | |
1437 | } | |
a76cbd9f | 1438 | consumer_data->err_sock = -1; |
76d7553f MD |
1439 | } |
1440 | if (consumer_data->cmd_sock >= 0) { | |
1441 | ret = close(consumer_data->cmd_sock); | |
1442 | if (ret) { | |
1443 | PERROR("close"); | |
1444 | } | |
a76cbd9f | 1445 | consumer_data->cmd_sock = -1; |
76d7553f | 1446 | } |
96544455 SS |
1447 | if (consumer_data->metadata_sock.fd_ptr && |
1448 | *consumer_data->metadata_sock.fd_ptr >= 0) { | |
9363801e | 1449 | ret = close(*consumer_data->metadata_sock.fd_ptr); |
331744e3 JD |
1450 | if (ret) { |
1451 | PERROR("close"); | |
1452 | } | |
1453 | } | |
76d7553f MD |
1454 | if (sock >= 0) { |
1455 | ret = close(sock); | |
1456 | if (ret) { | |
1457 | PERROR("close"); | |
1458 | } | |
1459 | } | |
273ea72c | 1460 | |
3bd1e081 MD |
1461 | unlink(consumer_data->err_unix_sock_path); |
1462 | unlink(consumer_data->cmd_unix_sock_path); | |
fdadac08 | 1463 | pthread_mutex_unlock(&consumer_data->lock); |
92db7cdc | 1464 | |
fdadac08 | 1465 | /* Cleanup metadata socket mutex. */ |
96544455 SS |
1466 | if (consumer_data->metadata_sock.lock) { |
1467 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1468 | free(consumer_data->metadata_sock.lock); | |
1469 | } | |
5eb91c98 | 1470 | lttng_poll_clean(&events); |
b3530820 JG |
1471 | |
1472 | if (cmd_socket_wrapper) { | |
1473 | consumer_destroy_socket(cmd_socket_wrapper); | |
1474 | } | |
76d7553f | 1475 | error_poll: |
139ac872 | 1476 | if (err) { |
840cb59c | 1477 | health_error(); |
139ac872 MD |
1478 | ERR("Health error occurred in %s", __func__); |
1479 | } | |
8782cc74 | 1480 | health_unregister(health_sessiond); |
76d7553f | 1481 | DBG("consumer thread cleanup completed"); |
0177d773 | 1482 | |
34c1e15a MD |
1483 | rcu_thread_offline(); |
1484 | rcu_unregister_thread(); | |
1485 | ||
5eb91c98 | 1486 | return NULL; |
099e26bd DG |
1487 | } |
1488 | ||
099e26bd | 1489 | /* |
81f04d5f JG |
1490 | * This thread receives application command sockets (FDs) on the |
1491 | * apps_cmd_pipe and waits (polls) on them until they are closed | |
1492 | * or an error occurs. | |
1493 | * | |
1494 | * At that point, it flushes the data (tracing and metadata) associated | |
1495 | * with this application and tears down ust app sessions and other | |
1496 | * associated data structures through ust_app_unregister(). | |
1497 | * | |
1498 | * Note that this thread never sends commands to the applications | |
1499 | * through the command sockets; it merely listens for hang-ups | |
1500 | * and errors on those sockets and cleans-up as they occur. | |
1d4b027a DG |
1501 | */ |
1502 | static void *thread_manage_apps(void *data) | |
099e26bd | 1503 | { |
139ac872 | 1504 | int i, ret, pollfd, err = -1; |
6cd525e8 | 1505 | ssize_t size_ret; |
5eb91c98 | 1506 | uint32_t revents, nb_fd; |
5eb91c98 | 1507 | struct lttng_poll_event events; |
099e26bd DG |
1508 | |
1509 | DBG("[thread] Manage application started"); | |
1510 | ||
f6a9efaa DG |
1511 | rcu_register_thread(); |
1512 | rcu_thread_online(); | |
1513 | ||
6c71277b | 1514 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE); |
927ca06a | 1515 | |
e547b070 | 1516 | if (testpoint(sessiond_thread_manage_apps)) { |
6993eeb3 CB |
1517 | goto error_testpoint; |
1518 | } | |
1519 | ||
840cb59c | 1520 | health_code_update(); |
44a5e5eb | 1521 | |
d0b96690 | 1522 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1523 | if (ret < 0) { |
76d7553f | 1524 | goto error_poll_create; |
5eb91c98 | 1525 | } |
099e26bd | 1526 | |
5eb91c98 DG |
1527 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1528 | if (ret < 0) { | |
1529 | goto error; | |
1530 | } | |
099e26bd | 1531 | |
e547b070 | 1532 | if (testpoint(sessiond_thread_manage_apps_before_loop)) { |
6993eeb3 CB |
1533 | goto error; |
1534 | } | |
8ac94142 | 1535 | |
840cb59c | 1536 | health_code_update(); |
44a5e5eb | 1537 | |
5eb91c98 | 1538 | while (1) { |
7fa2082e | 1539 | DBG("Apps thread polling"); |
099e26bd DG |
1540 | |
1541 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1542 | restart: |
a78af745 | 1543 | health_poll_entry(); |
5eb91c98 | 1544 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
1545 | DBG("Apps thread return from poll on %d fds", |
1546 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 1547 | health_poll_exit(); |
099e26bd | 1548 | if (ret < 0) { |
88f2b785 MD |
1549 | /* |
1550 | * Restart interrupted system call. | |
1551 | */ | |
1552 | if (errno == EINTR) { | |
1553 | goto restart; | |
1554 | } | |
099e26bd DG |
1555 | goto error; |
1556 | } | |
1557 | ||
0d9c5d77 DG |
1558 | nb_fd = ret; |
1559 | ||
5eb91c98 DG |
1560 | for (i = 0; i < nb_fd; i++) { |
1561 | /* Fetch once the poll data */ | |
1562 | revents = LTTNG_POLL_GETEV(&events, i); | |
1563 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1564 | ||
840cb59c | 1565 | health_code_update(); |
44a5e5eb | 1566 | |
fd20dac9 MD |
1567 | if (!revents) { |
1568 | /* No activity for this FD (poll implementation). */ | |
1569 | continue; | |
1570 | } | |
1571 | ||
5eb91c98 | 1572 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1573 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1574 | if (ret) { |
139ac872 MD |
1575 | err = 0; |
1576 | goto exit; | |
5eb91c98 | 1577 | } |
099e26bd | 1578 | |
5eb91c98 DG |
1579 | /* Inspect the apps cmd pipe */ |
1580 | if (pollfd == apps_cmd_pipe[0]) { | |
03e43155 | 1581 | if (revents & LPOLLIN) { |
d0b96690 DG |
1582 | int sock; |
1583 | ||
5eb91c98 | 1584 | /* Empty pipe */ |
6cd525e8 MD |
1585 | size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
1586 | if (size_ret < sizeof(sock)) { | |
76d7553f | 1587 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1588 | goto error; |
1589 | } | |
099e26bd | 1590 | |
840cb59c | 1591 | health_code_update(); |
44a5e5eb | 1592 | |
ffe60014 | 1593 | /* |
03e43155 MD |
1594 | * Since this is a command socket (write then read), |
1595 | * we only monitor the error events of the socket. | |
ffe60014 | 1596 | */ |
d0b96690 DG |
1597 | ret = lttng_poll_add(&events, sock, |
1598 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1599 | if (ret < 0) { | |
5eb91c98 | 1600 | goto error; |
e0c7ec2b | 1601 | } |
acc7b41b | 1602 | |
d0b96690 | 1603 | DBG("Apps with sock %d added to poll set", sock); |
03e43155 MD |
1604 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1605 | ERR("Apps command pipe error"); | |
1606 | goto error; | |
1607 | } else { | |
1608 | ERR("Unknown poll events %u for sock %d", revents, pollfd); | |
1609 | goto error; | |
0177d773 | 1610 | } |
5eb91c98 DG |
1611 | } else { |
1612 | /* | |
54d01ffb DG |
1613 | * At this point, we know that a registered application made |
1614 | * the event at poll_wait. | |
5eb91c98 DG |
1615 | */ |
1616 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1617 | /* Removing from the poll set */ | |
1618 | ret = lttng_poll_del(&events, pollfd); | |
1619 | if (ret < 0) { | |
1620 | goto error; | |
1621 | } | |
099e26bd | 1622 | |
b9d9b220 | 1623 | /* Socket closed on remote end. */ |
56fff090 | 1624 | ust_app_unregister(pollfd); |
03e43155 MD |
1625 | } else { |
1626 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1627 | goto error; | |
5eb91c98 | 1628 | } |
099e26bd | 1629 | } |
44a5e5eb | 1630 | |
840cb59c | 1631 | health_code_update(); |
099e26bd | 1632 | } |
099e26bd DG |
1633 | } |
1634 | ||
139ac872 | 1635 | exit: |
099e26bd | 1636 | error: |
5eb91c98 | 1637 | lttng_poll_clean(&events); |
76d7553f | 1638 | error_poll_create: |
6993eeb3 | 1639 | error_testpoint: |
6620da75 DG |
1640 | utils_close_pipe(apps_cmd_pipe); |
1641 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1642 | ||
1643 | /* | |
1644 | * We don't clean the UST app hash table here since already registered | |
1645 | * applications can still be controlled so let them be until the session | |
1646 | * daemon dies or the applications stop. | |
1647 | */ | |
1648 | ||
139ac872 | 1649 | if (err) { |
840cb59c | 1650 | health_error(); |
139ac872 MD |
1651 | ERR("Health error occurred in %s", __func__); |
1652 | } | |
8782cc74 | 1653 | health_unregister(health_sessiond); |
76d7553f | 1654 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1655 | rcu_thread_offline(); |
1656 | rcu_unregister_thread(); | |
099e26bd DG |
1657 | return NULL; |
1658 | } | |
1659 | ||
d0b96690 | 1660 | /* |
d88aee68 DG |
1661 | * Send a socket to a thread This is called from the dispatch UST registration |
1662 | * thread once all sockets are set for the application. | |
d0b96690 | 1663 | * |
b85dc84c DG |
1664 | * The sock value can be invalid, we don't really care, the thread will handle |
1665 | * it and make the necessary cleanup if so. | |
1666 | * | |
d0b96690 DG |
1667 | * On success, return 0 else a negative value being the errno message of the |
1668 | * write(). | |
1669 | */ | |
d88aee68 | 1670 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 | 1671 | { |
6cd525e8 | 1672 | ssize_t ret; |
d0b96690 | 1673 | |
b85dc84c DG |
1674 | /* |
1675 | * It's possible that the FD is set as invalid with -1 concurrently just | |
1676 | * before calling this function being a shutdown state of the thread. | |
1677 | */ | |
1678 | if (fd < 0) { | |
1679 | ret = -EBADF; | |
1680 | goto error; | |
1681 | } | |
d0b96690 | 1682 | |
6cd525e8 MD |
1683 | ret = lttng_write(fd, &sock, sizeof(sock)); |
1684 | if (ret < sizeof(sock)) { | |
d88aee68 | 1685 | PERROR("write apps pipe %d", fd); |
d0b96690 DG |
1686 | if (ret < 0) { |
1687 | ret = -errno; | |
1688 | } | |
1689 | goto error; | |
1690 | } | |
1691 | ||
1692 | /* All good. Don't send back the write positive ret value. */ | |
1693 | ret = 0; | |
1694 | error: | |
6cd525e8 | 1695 | return (int) ret; |
d0b96690 DG |
1696 | } |
1697 | ||
f45e313d DG |
1698 | /* |
1699 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1700 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1701 | * notify socket is never received. | |
1702 | */ | |
1703 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1704 | { | |
1705 | int ret, nb_fd = 0, i; | |
1706 | unsigned int fd_added = 0; | |
1707 | struct lttng_poll_event events; | |
1708 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1709 | ||
1710 | assert(wait_queue); | |
1711 | ||
1712 | lttng_poll_init(&events); | |
1713 | ||
1714 | /* Just skip everything for an empty queue. */ | |
1715 | if (!wait_queue->count) { | |
1716 | goto end; | |
1717 | } | |
1718 | ||
1719 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1720 | if (ret < 0) { | |
1721 | goto error_create; | |
1722 | } | |
1723 | ||
1724 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1725 | &wait_queue->head, head) { | |
1726 | assert(wait_node->app); | |
1727 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1728 | LPOLLHUP | LPOLLERR); | |
1729 | if (ret < 0) { | |
1730 | goto error; | |
1731 | } | |
1732 | ||
1733 | fd_added = 1; | |
1734 | } | |
1735 | ||
1736 | if (!fd_added) { | |
1737 | goto end; | |
1738 | } | |
1739 | ||
1740 | /* | |
1741 | * Poll but don't block so we can quickly identify the faulty events and | |
1742 | * clean them afterwards from the wait queue. | |
1743 | */ | |
1744 | ret = lttng_poll_wait(&events, 0); | |
1745 | if (ret < 0) { | |
1746 | goto error; | |
1747 | } | |
1748 | nb_fd = ret; | |
1749 | ||
1750 | for (i = 0; i < nb_fd; i++) { | |
1751 | /* Get faulty FD. */ | |
1752 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1753 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1754 | ||
fd20dac9 MD |
1755 | if (!revents) { |
1756 | /* No activity for this FD (poll implementation). */ | |
1757 | continue; | |
1758 | } | |
1759 | ||
f45e313d DG |
1760 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
1761 | &wait_queue->head, head) { | |
1762 | if (pollfd == wait_node->app->sock && | |
1763 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1764 | cds_list_del(&wait_node->head); | |
1765 | wait_queue->count--; | |
1766 | ust_app_destroy(wait_node->app); | |
1767 | free(wait_node); | |
48b40bcf JG |
1768 | /* |
1769 | * Silence warning of use-after-free in | |
1770 | * cds_list_for_each_entry_safe which uses | |
1771 | * __typeof__(*wait_node). | |
1772 | */ | |
1773 | wait_node = NULL; | |
f45e313d | 1774 | break; |
03e43155 MD |
1775 | } else { |
1776 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1777 | goto error; | |
f45e313d DG |
1778 | } |
1779 | } | |
1780 | } | |
1781 | ||
1782 | if (nb_fd > 0) { | |
1783 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1784 | } | |
1785 | ||
1786 | end: | |
1787 | lttng_poll_clean(&events); | |
1788 | return; | |
1789 | ||
1790 | error: | |
1791 | lttng_poll_clean(&events); | |
1792 | error_create: | |
1793 | ERR("Unable to sanitize wait queue"); | |
1794 | return; | |
1795 | } | |
1796 | ||
099e26bd DG |
1797 | /* |
1798 | * Dispatch request from the registration threads to the application | |
1799 | * communication thread. | |
1800 | */ | |
1801 | static void *thread_dispatch_ust_registration(void *data) | |
1802 | { | |
12e2b881 | 1803 | int ret, err = -1; |
8bdee6e2 | 1804 | struct cds_wfcq_node *node; |
099e26bd | 1805 | struct ust_command *ust_cmd = NULL; |
f45e313d DG |
1806 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1807 | struct ust_reg_wait_queue wait_queue = { | |
1808 | .count = 0, | |
1809 | }; | |
d0b96690 | 1810 | |
967e3668 MD |
1811 | rcu_register_thread(); |
1812 | ||
6c71277b | 1813 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH); |
12e2b881 | 1814 | |
9ad42ec1 MD |
1815 | if (testpoint(sessiond_thread_app_reg_dispatch)) { |
1816 | goto error_testpoint; | |
1817 | } | |
1818 | ||
12e2b881 MD |
1819 | health_code_update(); |
1820 | ||
f45e313d | 1821 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1822 | |
1823 | DBG("[thread] Dispatch UST command started"); | |
1824 | ||
0ed3b1a8 | 1825 | for (;;) { |
12e2b881 MD |
1826 | health_code_update(); |
1827 | ||
099e26bd DG |
1828 | /* Atomically prepare the queue futex */ |
1829 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1830 | ||
0ed3b1a8 MD |
1831 | if (CMM_LOAD_SHARED(dispatch_thread_exit)) { |
1832 | break; | |
1833 | } | |
1834 | ||
099e26bd | 1835 | do { |
d0b96690 | 1836 | struct ust_app *app = NULL; |
7972aab2 | 1837 | ust_cmd = NULL; |
d0b96690 | 1838 | |
f45e313d DG |
1839 | /* |
1840 | * Make sure we don't have node(s) that have hung up before receiving | |
1841 | * the notify socket. This is to clean the list in order to avoid | |
1842 | * memory leaks from notify socket that are never seen. | |
1843 | */ | |
1844 | sanitize_wait_queue(&wait_queue); | |
1845 | ||
12e2b881 | 1846 | health_code_update(); |
099e26bd | 1847 | /* Dequeue command for registration */ |
8bdee6e2 | 1848 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 1849 | if (node == NULL) { |
00a17c97 | 1850 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1851 | /* Continue thread execution */ |
1852 | break; | |
1853 | } | |
1854 | ||
1855 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1856 | ||
2f50c8a3 DG |
1857 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1858 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1859 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1860 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1861 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1862 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1863 | |
1864 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1865 | wait_node = zmalloc(sizeof(*wait_node)); | |
1866 | if (!wait_node) { | |
1867 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1868 | ret = close(ust_cmd->sock); |
1869 | if (ret < 0) { | |
1870 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1871 | } | |
51dec90d | 1872 | lttng_fd_put(LTTNG_FD_APPS, 1); |
7972aab2 | 1873 | free(ust_cmd); |
d0b96690 DG |
1874 | goto error; |
1875 | } | |
1876 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1877 | ||
1878 | /* Create application object if socket is CMD. */ | |
1879 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1880 | ust_cmd->sock); | |
1881 | if (!wait_node->app) { | |
1882 | ret = close(ust_cmd->sock); | |
1883 | if (ret < 0) { | |
1884 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1885 | } |
51dec90d | 1886 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 1887 | free(wait_node); |
7972aab2 | 1888 | free(ust_cmd); |
d0b96690 DG |
1889 | continue; |
1890 | } | |
1891 | /* | |
1892 | * Add application to the wait queue so we can set the notify | |
1893 | * socket before putting this object in the global ht. | |
1894 | */ | |
f45e313d DG |
1895 | cds_list_add(&wait_node->head, &wait_queue.head); |
1896 | wait_queue.count++; | |
d0b96690 | 1897 | |
7972aab2 | 1898 | free(ust_cmd); |
d0b96690 DG |
1899 | /* |
1900 | * We have to continue here since we don't have the notify | |
1901 | * socket and the application MUST be added to the hash table | |
1902 | * only at that moment. | |
1903 | */ | |
1904 | continue; | |
1905 | } else { | |
1906 | /* | |
1907 | * Look for the application in the local wait queue and set the | |
1908 | * notify socket if found. | |
1909 | */ | |
d88aee68 | 1910 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1911 | &wait_queue.head, head) { |
12e2b881 | 1912 | health_code_update(); |
d0b96690 DG |
1913 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1914 | wait_node->app->notify_sock = ust_cmd->sock; | |
1915 | cds_list_del(&wait_node->head); | |
f45e313d | 1916 | wait_queue.count--; |
d0b96690 DG |
1917 | app = wait_node->app; |
1918 | free(wait_node); | |
1919 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1920 | break; | |
1921 | } | |
1922 | } | |
020d7f60 DG |
1923 | |
1924 | /* | |
1925 | * With no application at this stage the received socket is | |
1926 | * basically useless so close it before we free the cmd data | |
1927 | * structure for good. | |
1928 | */ | |
1929 | if (!app) { | |
1930 | ret = close(ust_cmd->sock); | |
1931 | if (ret < 0) { | |
1932 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1933 | } | |
51dec90d | 1934 | lttng_fd_put(LTTNG_FD_APPS, 1); |
020d7f60 | 1935 | } |
7972aab2 | 1936 | free(ust_cmd); |
d0b96690 DG |
1937 | } |
1938 | ||
1939 | if (app) { | |
d0b96690 DG |
1940 | /* |
1941 | * @session_lock_list | |
1942 | * | |
1943 | * Lock the global session list so from the register up to the | |
1944 | * registration done message, no thread can see the application | |
1945 | * and change its state. | |
1946 | */ | |
1947 | session_lock_list(); | |
1948 | rcu_read_lock(); | |
d88aee68 | 1949 | |
d0b96690 DG |
1950 | /* |
1951 | * Add application to the global hash table. This needs to be | |
1952 | * done before the update to the UST registry can locate the | |
1953 | * application. | |
1954 | */ | |
1955 | ust_app_add(app); | |
d88aee68 DG |
1956 | |
1957 | /* Set app version. This call will print an error if needed. */ | |
1958 | (void) ust_app_version(app); | |
1959 | ||
1960 | /* Send notify socket through the notify pipe. */ | |
1961 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1962 | app->notify_sock); | |
1963 | if (ret < 0) { | |
1964 | rcu_read_unlock(); | |
1965 | session_unlock_list(); | |
b85dc84c DG |
1966 | /* |
1967 | * No notify thread, stop the UST tracing. However, this is | |
1968 | * not an internal error of the this thread thus setting | |
1969 | * the health error code to a normal exit. | |
1970 | */ | |
1971 | err = 0; | |
d88aee68 | 1972 | goto error; |
6620da75 | 1973 | } |
d88aee68 | 1974 | |
d0b96690 DG |
1975 | /* |
1976 | * Update newly registered application with the tracing | |
1977 | * registry info already enabled information. | |
1978 | */ | |
1979 | update_ust_app(app->sock); | |
d88aee68 DG |
1980 | |
1981 | /* | |
1982 | * Don't care about return value. Let the manage apps threads | |
1983 | * handle app unregistration upon socket close. | |
1984 | */ | |
fb45065e | 1985 | (void) ust_app_register_done(app); |
d88aee68 DG |
1986 | |
1987 | /* | |
1988 | * Even if the application socket has been closed, send the app | |
1989 | * to the thread and unregistration will take place at that | |
1990 | * place. | |
1991 | */ | |
1992 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1993 | if (ret < 0) { |
d88aee68 DG |
1994 | rcu_read_unlock(); |
1995 | session_unlock_list(); | |
b85dc84c DG |
1996 | /* |
1997 | * No apps. thread, stop the UST tracing. However, this is | |
1998 | * not an internal error of the this thread thus setting | |
1999 | * the health error code to a normal exit. | |
2000 | */ | |
2001 | err = 0; | |
d88aee68 | 2002 | goto error; |
d0b96690 | 2003 | } |
d88aee68 | 2004 | |
d0b96690 DG |
2005 | rcu_read_unlock(); |
2006 | session_unlock_list(); | |
099e26bd | 2007 | } |
099e26bd DG |
2008 | } while (node != NULL); |
2009 | ||
12e2b881 | 2010 | health_poll_entry(); |
099e26bd DG |
2011 | /* Futex wait on queue. Blocking call on futex() */ |
2012 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 2013 | health_poll_exit(); |
099e26bd | 2014 | } |
12e2b881 MD |
2015 | /* Normal exit, no error */ |
2016 | err = 0; | |
099e26bd DG |
2017 | |
2018 | error: | |
d88aee68 DG |
2019 | /* Clean up wait queue. */ |
2020 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 2021 | &wait_queue.head, head) { |
d88aee68 | 2022 | cds_list_del(&wait_node->head); |
f45e313d | 2023 | wait_queue.count--; |
d88aee68 DG |
2024 | free(wait_node); |
2025 | } | |
2026 | ||
772b8f4d MD |
2027 | /* Empty command queue. */ |
2028 | for (;;) { | |
2029 | /* Dequeue command for registration */ | |
2030 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); | |
2031 | if (node == NULL) { | |
2032 | break; | |
2033 | } | |
2034 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
2035 | ret = close(ust_cmd->sock); | |
2036 | if (ret < 0) { | |
2037 | PERROR("close ust sock exit dispatch %d", ust_cmd->sock); | |
2038 | } | |
2039 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2040 | free(ust_cmd); | |
2041 | } | |
2042 | ||
9ad42ec1 | 2043 | error_testpoint: |
099e26bd | 2044 | DBG("Dispatch thread dying"); |
12e2b881 MD |
2045 | if (err) { |
2046 | health_error(); | |
2047 | ERR("Health error occurred in %s", __func__); | |
2048 | } | |
8782cc74 | 2049 | health_unregister(health_sessiond); |
967e3668 | 2050 | rcu_unregister_thread(); |
099e26bd DG |
2051 | return NULL; |
2052 | } | |
2053 | ||
2054 | /* | |
2055 | * This thread manage application registration. | |
2056 | */ | |
2057 | static void *thread_registration_apps(void *data) | |
1d4b027a | 2058 | { |
139ac872 | 2059 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
2060 | uint32_t revents, nb_fd; |
2061 | struct lttng_poll_event events; | |
099e26bd DG |
2062 | /* |
2063 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
2064 | * freed in the manage apps thread. | |
2065 | */ | |
2066 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 2067 | |
099e26bd | 2068 | DBG("[thread] Manage application registration started"); |
1d4b027a | 2069 | |
6c71277b | 2070 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG); |
927ca06a | 2071 | |
e547b070 | 2072 | if (testpoint(sessiond_thread_registration_apps)) { |
6993eeb3 CB |
2073 | goto error_testpoint; |
2074 | } | |
8ac94142 | 2075 | |
1d4b027a DG |
2076 | ret = lttcomm_listen_unix_sock(apps_sock); |
2077 | if (ret < 0) { | |
76d7553f | 2078 | goto error_listen; |
1d4b027a DG |
2079 | } |
2080 | ||
5eb91c98 DG |
2081 | /* |
2082 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
2083 | * more will be added to this poll set. | |
2084 | */ | |
d0b96690 | 2085 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 2086 | if (ret < 0) { |
76d7553f | 2087 | goto error_create_poll; |
5eb91c98 | 2088 | } |
273ea72c | 2089 | |
5eb91c98 DG |
2090 | /* Add the application registration socket */ |
2091 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
2092 | if (ret < 0) { | |
76d7553f | 2093 | goto error_poll_add; |
5eb91c98 | 2094 | } |
273ea72c | 2095 | |
1d4b027a | 2096 | /* Notify all applications to register */ |
0fdd1e2c DG |
2097 | ret = notify_ust_apps(1); |
2098 | if (ret < 0) { | |
2099 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
2100 | "Execution continues but there might be problem for already\n" |
2101 | "running applications that wishes to register."); | |
0fdd1e2c | 2102 | } |
1d4b027a DG |
2103 | |
2104 | while (1) { | |
2105 | DBG("Accepting application registration"); | |
273ea72c DG |
2106 | |
2107 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 2108 | restart: |
a78af745 | 2109 | health_poll_entry(); |
5eb91c98 | 2110 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 2111 | health_poll_exit(); |
273ea72c | 2112 | if (ret < 0) { |
88f2b785 MD |
2113 | /* |
2114 | * Restart interrupted system call. | |
2115 | */ | |
2116 | if (errno == EINTR) { | |
2117 | goto restart; | |
2118 | } | |
273ea72c DG |
2119 | goto error; |
2120 | } | |
2121 | ||
0d9c5d77 DG |
2122 | nb_fd = ret; |
2123 | ||
5eb91c98 | 2124 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 2125 | health_code_update(); |
139ac872 | 2126 | |
5eb91c98 DG |
2127 | /* Fetch once the poll data */ |
2128 | revents = LTTNG_POLL_GETEV(&events, i); | |
2129 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 2130 | |
fd20dac9 MD |
2131 | if (!revents) { |
2132 | /* No activity for this FD (poll implementation). */ | |
2133 | continue; | |
2134 | } | |
2135 | ||
5eb91c98 | 2136 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 2137 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 2138 | if (ret) { |
139ac872 MD |
2139 | err = 0; |
2140 | goto exit; | |
90014c57 | 2141 | } |
1d4b027a | 2142 | |
5eb91c98 DG |
2143 | /* Event on the registration socket */ |
2144 | if (pollfd == apps_sock) { | |
03e43155 | 2145 | if (revents & LPOLLIN) { |
5eb91c98 DG |
2146 | sock = lttcomm_accept_unix_sock(apps_sock); |
2147 | if (sock < 0) { | |
2148 | goto error; | |
2149 | } | |
099e26bd | 2150 | |
16c5c8fa DG |
2151 | /* |
2152 | * Set socket timeout for both receiving and ending. | |
2153 | * app_socket_timeout is in seconds, whereas | |
2154 | * lttcomm_setsockopt_rcv_timeout and | |
2155 | * lttcomm_setsockopt_snd_timeout expect msec as | |
2156 | * parameter. | |
2157 | */ | |
e6142f2e | 2158 | if (config.app_socket_timeout >= 0) { |
28ce0ff2 | 2159 | (void) lttcomm_setsockopt_rcv_timeout(sock, |
e6142f2e | 2160 | config.app_socket_timeout * 1000); |
28ce0ff2 | 2161 | (void) lttcomm_setsockopt_snd_timeout(sock, |
e6142f2e | 2162 | config.app_socket_timeout * 1000); |
28ce0ff2 | 2163 | } |
16c5c8fa | 2164 | |
b662582b DG |
2165 | /* |
2166 | * Set the CLOEXEC flag. Return code is useless because | |
2167 | * either way, the show must go on. | |
2168 | */ | |
2169 | (void) utils_set_fd_cloexec(sock); | |
2170 | ||
5eb91c98 | 2171 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 2172 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 2173 | if (ust_cmd == NULL) { |
76d7553f | 2174 | PERROR("ust command zmalloc"); |
41ed8e47 MD |
2175 | ret = close(sock); |
2176 | if (ret) { | |
2177 | PERROR("close"); | |
2178 | } | |
5eb91c98 DG |
2179 | goto error; |
2180 | } | |
1d4b027a | 2181 | |
5eb91c98 DG |
2182 | /* |
2183 | * Using message-based transmissions to ensure we don't | |
2184 | * have to deal with partially received messages. | |
2185 | */ | |
4063050c MD |
2186 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
2187 | if (ret < 0) { | |
2188 | ERR("Exhausted file descriptors allowed for applications."); | |
2189 | free(ust_cmd); | |
2190 | ret = close(sock); | |
2191 | if (ret) { | |
2192 | PERROR("close"); | |
2193 | } | |
2194 | sock = -1; | |
2195 | continue; | |
2196 | } | |
d88aee68 | 2197 | |
840cb59c | 2198 | health_code_update(); |
d0b96690 DG |
2199 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
2200 | if (ret < 0) { | |
5eb91c98 | 2201 | free(ust_cmd); |
d0b96690 | 2202 | /* Close socket of the application. */ |
76d7553f MD |
2203 | ret = close(sock); |
2204 | if (ret) { | |
2205 | PERROR("close"); | |
2206 | } | |
4063050c | 2207 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 2208 | sock = -1; |
5eb91c98 DG |
2209 | continue; |
2210 | } | |
840cb59c | 2211 | health_code_update(); |
099e26bd | 2212 | |
5eb91c98 | 2213 | ust_cmd->sock = sock; |
34a2494f | 2214 | sock = -1; |
099e26bd | 2215 | |
5eb91c98 DG |
2216 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
2217 | " gid:%d sock:%d name:%s (version %d.%d)", | |
2218 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
2219 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
2220 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
2221 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 2222 | |
5eb91c98 DG |
2223 | /* |
2224 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 2225 | * has been taken! This apps will be part of the *system*. |
5eb91c98 | 2226 | */ |
8bdee6e2 | 2227 | cds_wfcq_enqueue(&ust_cmd_queue.head, &ust_cmd_queue.tail, &ust_cmd->node); |
5eb91c98 DG |
2228 | |
2229 | /* | |
2230 | * Wake the registration queue futex. Implicit memory | |
8bdee6e2 | 2231 | * barrier with the exchange in cds_wfcq_enqueue. |
5eb91c98 DG |
2232 | */ |
2233 | futex_nto1_wake(&ust_cmd_queue.futex); | |
03e43155 MD |
2234 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2235 | ERR("Register apps socket poll error"); | |
2236 | goto error; | |
2237 | } else { | |
2238 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2239 | goto error; | |
5eb91c98 DG |
2240 | } |
2241 | } | |
90014c57 | 2242 | } |
1d4b027a DG |
2243 | } |
2244 | ||
139ac872 | 2245 | exit: |
1d4b027a | 2246 | error: |
0fdd1e2c DG |
2247 | /* Notify that the registration thread is gone */ |
2248 | notify_ust_apps(0); | |
2249 | ||
a4b35e07 | 2250 | if (apps_sock >= 0) { |
76d7553f MD |
2251 | ret = close(apps_sock); |
2252 | if (ret) { | |
2253 | PERROR("close"); | |
2254 | } | |
a4b35e07 | 2255 | } |
46c3f085 | 2256 | if (sock >= 0) { |
76d7553f MD |
2257 | ret = close(sock); |
2258 | if (ret) { | |
2259 | PERROR("close"); | |
2260 | } | |
4063050c | 2261 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 2262 | } |
e6142f2e | 2263 | unlink(config.apps_unix_sock_path.value); |
0fdd1e2c | 2264 | |
76d7553f | 2265 | error_poll_add: |
5eb91c98 | 2266 | lttng_poll_clean(&events); |
76d7553f MD |
2267 | error_listen: |
2268 | error_create_poll: | |
6993eeb3 | 2269 | error_testpoint: |
76d7553f | 2270 | DBG("UST Registration thread cleanup complete"); |
9ad42ec1 MD |
2271 | if (err) { |
2272 | health_error(); | |
2273 | ERR("Health error occurred in %s", __func__); | |
2274 | } | |
8782cc74 | 2275 | health_unregister(health_sessiond); |
5eb91c98 | 2276 | |
1d4b027a DG |
2277 | return NULL; |
2278 | } | |
2279 | ||
8c0faa1d | 2280 | /* |
3bd1e081 | 2281 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 2282 | * exec or it will fails. |
8c0faa1d | 2283 | */ |
3bd1e081 | 2284 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 2285 | { |
a23ec3a7 | 2286 | int ret, clock_ret; |
ee0b0061 DG |
2287 | struct timespec timeout; |
2288 | ||
13a7bce3 JG |
2289 | /* |
2290 | * Make sure we set the readiness flag to 0 because we are NOT ready. | |
2291 | * This access to consumer_thread_is_ready does not need to be | |
2292 | * protected by consumer_data.cond_mutex (yet) since the consumer | |
2293 | * management thread has not been started at this point. | |
2294 | */ | |
a23ec3a7 | 2295 | consumer_data->consumer_thread_is_ready = 0; |
8c0faa1d | 2296 | |
a23ec3a7 DG |
2297 | /* Setup pthread condition */ |
2298 | ret = pthread_condattr_init(&consumer_data->condattr); | |
4a15001e | 2299 | if (ret) { |
a23ec3a7 DG |
2300 | errno = ret; |
2301 | PERROR("pthread_condattr_init consumer data"); | |
2302 | goto error; | |
2303 | } | |
2304 | ||
2305 | /* | |
2306 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
2307 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
2308 | * for a more details and how we noticed it. | |
2309 | */ | |
2310 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
4a15001e | 2311 | if (ret) { |
a23ec3a7 DG |
2312 | errno = ret; |
2313 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
2314 | goto error; |
2315 | } | |
8c0faa1d | 2316 | |
a23ec3a7 | 2317 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
4a15001e | 2318 | if (ret) { |
a23ec3a7 DG |
2319 | errno = ret; |
2320 | PERROR("pthread_cond_init consumer data"); | |
2321 | goto error; | |
2322 | } | |
2323 | ||
1a1a34b4 MJ |
2324 | ret = pthread_create(&consumer_data->thread, default_pthread_attr(), |
2325 | thread_manage_consumer, consumer_data); | |
4a15001e MD |
2326 | if (ret) { |
2327 | errno = ret; | |
3bd1e081 | 2328 | PERROR("pthread_create consumer"); |
ee0b0061 | 2329 | ret = -1; |
8c0faa1d DG |
2330 | goto error; |
2331 | } | |
2332 | ||
a23ec3a7 DG |
2333 | /* We are about to wait on a pthread condition */ |
2334 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
2335 | ||
ee0b0061 | 2336 | /* Get time for sem_timedwait absolute timeout */ |
389fbf04 | 2337 | clock_ret = lttng_clock_gettime(CLOCK_MONOTONIC, &timeout); |
a23ec3a7 DG |
2338 | /* |
2339 | * Set the timeout for the condition timed wait even if the clock gettime | |
2340 | * call fails since we might loop on that call and we want to avoid to | |
2341 | * increment the timeout too many times. | |
2342 | */ | |
2343 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
2344 | ||
2345 | /* | |
2346 | * The following loop COULD be skipped in some conditions so this is why we | |
2347 | * set ret to 0 in order to make sure at least one round of the loop is | |
2348 | * done. | |
2349 | */ | |
2350 | ret = 0; | |
2351 | ||
2352 | /* | |
2353 | * Loop until the condition is reached or when a timeout is reached. Note | |
2354 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
2355 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
2356 | * possible. This loop does not take any chances and works with both of | |
2357 | * them. | |
2358 | */ | |
2359 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
2360 | if (clock_ret < 0) { | |
2361 | PERROR("clock_gettime spawn consumer"); | |
2362 | /* Infinite wait for the consumerd thread to be ready */ | |
2363 | ret = pthread_cond_wait(&consumer_data->cond, | |
2364 | &consumer_data->cond_mutex); | |
2365 | } else { | |
2366 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
2367 | &consumer_data->cond_mutex, &timeout); | |
2368 | } | |
ee0b0061 | 2369 | } |
8c0faa1d | 2370 | |
a23ec3a7 DG |
2371 | /* Release the pthread condition */ |
2372 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
2373 | ||
2374 | if (ret != 0) { | |
2375 | errno = ret; | |
2376 | if (ret == ETIMEDOUT) { | |
4282f9a3 DG |
2377 | int pth_ret; |
2378 | ||
ee0b0061 DG |
2379 | /* |
2380 | * Call has timed out so we kill the kconsumerd_thread and return | |
2381 | * an error. | |
2382 | */ | |
a23ec3a7 DG |
2383 | ERR("Condition timed out. The consumer thread was never ready." |
2384 | " Killing it"); | |
4282f9a3 DG |
2385 | pth_ret = pthread_cancel(consumer_data->thread); |
2386 | if (pth_ret < 0) { | |
3bd1e081 | 2387 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
2388 | } |
2389 | } else { | |
a23ec3a7 | 2390 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 | 2391 | } |
4282f9a3 DG |
2392 | /* Caller is expecting a negative value on failure. */ |
2393 | ret = -1; | |
ee0b0061 DG |
2394 | goto error; |
2395 | } | |
2396 | ||
3bd1e081 MD |
2397 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2398 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2399 | ERR("Consumerd did not start"); |
3bd1e081 | 2400 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2401 | goto error; |
2402 | } | |
3bd1e081 | 2403 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2404 | |
8c0faa1d DG |
2405 | return 0; |
2406 | ||
2407 | error: | |
2408 | return ret; | |
2409 | } | |
2410 | ||
d9800920 | 2411 | /* |
3bd1e081 | 2412 | * Join consumer thread |
d9800920 | 2413 | */ |
3bd1e081 | 2414 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2415 | { |
2416 | void *status; | |
cf3af59e | 2417 | |
e8209f6b DG |
2418 | /* Consumer pid must be a real one. */ |
2419 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2420 | int ret; |
3bd1e081 | 2421 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2422 | if (ret) { |
4a15001e | 2423 | PERROR("Error killing consumer daemon"); |
cf3af59e MD |
2424 | return ret; |
2425 | } | |
3bd1e081 | 2426 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2427 | } else { |
2428 | return 0; | |
2429 | } | |
2430 | } | |
2431 | ||
8c0faa1d | 2432 | /* |
3bd1e081 | 2433 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2434 | * |
d063d709 | 2435 | * Return pid if successful else -1. |
8c0faa1d | 2436 | */ |
3bd1e081 | 2437 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2438 | { |
2439 | int ret; | |
2440 | pid_t pid; | |
94c55f17 | 2441 | const char *consumer_to_use; |
53086306 | 2442 | const char *verbosity; |
94c55f17 | 2443 | struct stat st; |
8c0faa1d | 2444 | |
3bd1e081 | 2445 | DBG("Spawning consumerd"); |
c49dc785 | 2446 | |
8c0faa1d DG |
2447 | pid = fork(); |
2448 | if (pid == 0) { | |
2449 | /* | |
3bd1e081 | 2450 | * Exec consumerd. |
8c0faa1d | 2451 | */ |
e6142f2e | 2452 | if (config.verbose_consumer) { |
53086306 | 2453 | verbosity = "--verbose"; |
4421f712 | 2454 | } else if (lttng_opt_quiet) { |
53086306 | 2455 | verbosity = "--quiet"; |
4421f712 DG |
2456 | } else { |
2457 | verbosity = ""; | |
53086306 | 2458 | } |
4421f712 | 2459 | |
3bd1e081 MD |
2460 | switch (consumer_data->type) { |
2461 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2462 | /* |
c7704d57 DG |
2463 | * Find out which consumerd to execute. We will first try the |
2464 | * 64-bit path, then the sessiond's installation directory, and | |
2465 | * fallback on the 32-bit one, | |
94c55f17 | 2466 | */ |
63a799e8 | 2467 | DBG3("Looking for a kernel consumer at these locations:"); |
59ee5091 | 2468 | DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL"); |
e6142f2e | 2469 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); |
59ee5091 | 2470 | DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL"); |
e6142f2e | 2471 | if (stat(config.consumerd64_bin_path.value, &st) == 0) { |
63a799e8 | 2472 | DBG3("Found location #1"); |
e6142f2e JG |
2473 | consumer_to_use = config.consumerd64_bin_path.value; |
2474 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { | |
63a799e8 | 2475 | DBG3("Found location #2"); |
e6142f2e | 2476 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; |
a1a9f823 JG |
2477 | } else if (config.consumerd32_bin_path.value && |
2478 | stat(config.consumerd32_bin_path.value, &st) == 0) { | |
63a799e8 | 2479 | DBG3("Found location #3"); |
e6142f2e | 2480 | consumer_to_use = config.consumerd32_bin_path.value; |
94c55f17 | 2481 | } else { |
63a799e8 | 2482 | DBG("Could not find any valid consumerd executable"); |
4282f9a3 | 2483 | ret = -EINVAL; |
3d678709 | 2484 | goto error; |
94c55f17 AM |
2485 | } |
2486 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
6e2cc8d8 | 2487 | (void) execl(consumer_to_use, |
94c55f17 AM |
2488 | "lttng-consumerd", verbosity, "-k", |
2489 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2490 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
e6142f2e | 2491 | "--group", config.tracing_group_name.value, |
94c55f17 | 2492 | NULL); |
3bd1e081 | 2493 | break; |
7753dea8 MD |
2494 | case LTTNG_CONSUMER64_UST: |
2495 | { | |
46b23495 | 2496 | if (config.consumerd64_lib_dir.value) { |
8f4905da MD |
2497 | char *tmp; |
2498 | size_t tmplen; | |
ddaec4a2 | 2499 | char *tmpnew; |
8f4905da | 2500 | |
e8fa9fb0 | 2501 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2502 | if (!tmp) { |
2503 | tmp = ""; | |
2504 | } | |
d222983e | 2505 | tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); |
8f4905da MD |
2506 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
2507 | if (!tmpnew) { | |
2508 | ret = -ENOMEM; | |
2509 | goto error; | |
2510 | } | |
e6142f2e | 2511 | strcat(tmpnew, config.consumerd64_lib_dir.value); |
8f4905da MD |
2512 | if (tmp[0] != '\0') { |
2513 | strcat(tmpnew, ":"); | |
2514 | strcat(tmpnew, tmp); | |
2515 | } | |
d222983e | 2516 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); |
ddaec4a2 | 2517 | free(tmpnew); |
8f4905da MD |
2518 | if (ret) { |
2519 | ret = -errno; | |
2520 | goto error; | |
2521 | } | |
2522 | } | |
e6142f2e JG |
2523 | DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value); |
2524 | (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
7753dea8 MD |
2525 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2526 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
e6142f2e | 2527 | "--group", config.tracing_group_name.value, |
7753dea8 | 2528 | NULL); |
3bd1e081 | 2529 | break; |
7753dea8 MD |
2530 | } |
2531 | case LTTNG_CONSUMER32_UST: | |
2532 | { | |
46b23495 | 2533 | if (config.consumerd32_lib_dir.value) { |
8f4905da MD |
2534 | char *tmp; |
2535 | size_t tmplen; | |
ddaec4a2 | 2536 | char *tmpnew; |
8f4905da | 2537 | |
e8fa9fb0 | 2538 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2539 | if (!tmp) { |
2540 | tmp = ""; | |
2541 | } | |
d222983e | 2542 | tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); |
8f4905da MD |
2543 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
2544 | if (!tmpnew) { | |
2545 | ret = -ENOMEM; | |
2546 | goto error; | |
2547 | } | |
e6142f2e | 2548 | strcat(tmpnew, config.consumerd32_lib_dir.value); |
8f4905da MD |
2549 | if (tmp[0] != '\0') { |
2550 | strcat(tmpnew, ":"); | |
2551 | strcat(tmpnew, tmp); | |
2552 | } | |
d222983e | 2553 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); |
ddaec4a2 | 2554 | free(tmpnew); |
8f4905da MD |
2555 | if (ret) { |
2556 | ret = -errno; | |
2557 | goto error; | |
2558 | } | |
2559 | } | |
e6142f2e JG |
2560 | DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value); |
2561 | (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
7753dea8 MD |
2562 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2563 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
e6142f2e | 2564 | "--group", config.tracing_group_name.value, |
7753dea8 MD |
2565 | NULL); |
2566 | break; | |
2567 | } | |
3bd1e081 | 2568 | default: |
b60e7183 | 2569 | ERR("unknown consumer type"); |
e9d6b496 | 2570 | errno = 0; |
3bd1e081 | 2571 | } |
8c0faa1d | 2572 | if (errno != 0) { |
4282f9a3 | 2573 | PERROR("Consumer execl()"); |
8c0faa1d | 2574 | } |
4282f9a3 | 2575 | /* Reaching this point, we got a failure on our execl(). */ |
8c0faa1d DG |
2576 | exit(EXIT_FAILURE); |
2577 | } else if (pid > 0) { | |
2578 | ret = pid; | |
8c0faa1d | 2579 | } else { |
76d7553f | 2580 | PERROR("start consumer fork"); |
8c0faa1d | 2581 | ret = -errno; |
8c0faa1d | 2582 | } |
8f4905da | 2583 | error: |
8c0faa1d DG |
2584 | return ret; |
2585 | } | |
2586 | ||
693bd40b | 2587 | /* |
3bd1e081 | 2588 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2589 | */ |
3bd1e081 | 2590 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2591 | { |
c617c0c6 | 2592 | int ret; |
edb8b045 DG |
2593 | |
2594 | /* | |
2595 | * Set the listen() state on the socket since there is a possible race | |
2596 | * between the exec() of the consumer daemon and this call if place in the | |
2597 | * consumer thread. See bug #366 for more details. | |
2598 | */ | |
2599 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2600 | if (ret < 0) { | |
2601 | goto error; | |
2602 | } | |
693bd40b | 2603 | |
3bd1e081 MD |
2604 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2605 | if (consumer_data->pid != 0) { | |
2606 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2607 | goto end; |
2608 | } | |
693bd40b | 2609 | |
3bd1e081 | 2610 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2611 | if (ret < 0) { |
3bd1e081 MD |
2612 | ERR("Spawning consumerd failed"); |
2613 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2614 | goto error; |
693bd40b | 2615 | } |
c49dc785 | 2616 | |
3bd1e081 MD |
2617 | /* Setting up the consumer_data pid */ |
2618 | consumer_data->pid = ret; | |
48842b30 | 2619 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2620 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2621 | |
3bd1e081 MD |
2622 | DBG2("Spawning consumer control thread"); |
2623 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2624 | if (ret < 0) { |
3bd1e081 | 2625 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2626 | goto error; |
2627 | } | |
2628 | ||
c49dc785 | 2629 | end: |
693bd40b DG |
2630 | return 0; |
2631 | ||
2632 | error: | |
331744e3 | 2633 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2634 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2635 | int err; |
2636 | ||
edb8b045 DG |
2637 | err = close(consumer_data->err_sock); |
2638 | if (err < 0) { | |
2639 | PERROR("close consumer data error socket"); | |
2640 | } | |
2641 | } | |
693bd40b DG |
2642 | return ret; |
2643 | } | |
2644 | ||
b73401da | 2645 | /* |
096102bd | 2646 | * Setup necessary data for kernel tracer action. |
b73401da | 2647 | */ |
096102bd | 2648 | static int init_kernel_tracer(void) |
b73401da DG |
2649 | { |
2650 | int ret; | |
b73401da | 2651 | |
096102bd DG |
2652 | /* Modprobe lttng kernel modules */ |
2653 | ret = modprobe_lttng_control(); | |
b73401da | 2654 | if (ret < 0) { |
b73401da DG |
2655 | goto error; |
2656 | } | |
2657 | ||
096102bd DG |
2658 | /* Open debugfs lttng */ |
2659 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2660 | if (kernel_tracer_fd < 0) { | |
2661 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b | 2662 | goto error_open; |
54d01ffb DG |
2663 | } |
2664 | ||
2f77fc4b | 2665 | /* Validate kernel version */ |
88076e89 JD |
2666 | ret = kernel_validate_version(kernel_tracer_fd, &kernel_tracer_version, |
2667 | &kernel_tracer_abi_version); | |
2f77fc4b DG |
2668 | if (ret < 0) { |
2669 | goto error_version; | |
b551a063 | 2670 | } |
54d01ffb | 2671 | |
2f77fc4b DG |
2672 | ret = modprobe_lttng_data(); |
2673 | if (ret < 0) { | |
2674 | goto error_modules; | |
54d01ffb DG |
2675 | } |
2676 | ||
6e21424e JR |
2677 | ret = kernel_supports_ring_buffer_snapshot_sample_positions( |
2678 | kernel_tracer_fd); | |
2679 | if (ret < 0) { | |
2680 | goto error_modules; | |
2681 | } | |
2682 | ||
2683 | if (ret < 1) { | |
2684 | WARN("Kernel tracer does not support buffer monitoring. " | |
2685 | "The monitoring timer of channels in the kernel domain " | |
2686 | "will be set to 0 (disabled)."); | |
2687 | } | |
2688 | ||
2f77fc4b DG |
2689 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2690 | return 0; | |
2691 | ||
2692 | error_version: | |
2693 | modprobe_remove_lttng_control(); | |
2694 | ret = close(kernel_tracer_fd); | |
2695 | if (ret) { | |
2696 | PERROR("close"); | |
b551a063 | 2697 | } |
2f77fc4b | 2698 | kernel_tracer_fd = -1; |
f73fabfd | 2699 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2700 | |
2f77fc4b DG |
2701 | error_modules: |
2702 | ret = close(kernel_tracer_fd); | |
2703 | if (ret) { | |
2704 | PERROR("close"); | |
b551a063 | 2705 | } |
54d01ffb | 2706 | |
2f77fc4b DG |
2707 | error_open: |
2708 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2709 | |
2710 | error: | |
2f77fc4b DG |
2711 | WARN("No kernel tracer available"); |
2712 | kernel_tracer_fd = -1; | |
2713 | if (!is_root) { | |
f73fabfd | 2714 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2715 | } else { |
f73fabfd | 2716 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2717 | } |
54d01ffb DG |
2718 | } |
2719 | ||
2f77fc4b | 2720 | |
54d01ffb | 2721 | /* |
2f77fc4b DG |
2722 | * Copy consumer output from the tracing session to the domain session. The |
2723 | * function also applies the right modification on a per domain basis for the | |
2724 | * trace files destination directory. | |
36b588ed MD |
2725 | * |
2726 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2727 | */ |
2f77fc4b | 2728 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2729 | { |
2730 | int ret; | |
2f77fc4b DG |
2731 | const char *dir_name; |
2732 | struct consumer_output *consumer; | |
2733 | ||
2734 | assert(session); | |
2735 | assert(session->consumer); | |
54d01ffb | 2736 | |
b551a063 DG |
2737 | switch (domain) { |
2738 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2739 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2740 | /* |
2741 | * XXX: We should audit the session creation and what this function | |
2742 | * does "extra" in order to avoid a destroy since this function is used | |
2743 | * in the domain session creation (kernel and ust) only. Same for UST | |
2744 | * domain. | |
2745 | */ | |
2746 | if (session->kernel_session->consumer) { | |
6addfa37 | 2747 | consumer_output_put(session->kernel_session->consumer); |
09a90bcd | 2748 | } |
2f77fc4b DG |
2749 | session->kernel_session->consumer = |
2750 | consumer_copy_output(session->consumer); | |
2751 | /* Ease our life a bit for the next part */ | |
2752 | consumer = session->kernel_session->consumer; | |
2753 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 | 2754 | break; |
f20baf8e | 2755 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2756 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2757 | case LTTNG_DOMAIN_PYTHON: |
b551a063 | 2758 | case LTTNG_DOMAIN_UST: |
2f77fc4b | 2759 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd | 2760 | if (session->ust_session->consumer) { |
6addfa37 | 2761 | consumer_output_put(session->ust_session->consumer); |
09a90bcd | 2762 | } |
2f77fc4b DG |
2763 | session->ust_session->consumer = |
2764 | consumer_copy_output(session->consumer); | |
2765 | /* Ease our life a bit for the next part */ | |
2766 | consumer = session->ust_session->consumer; | |
2767 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2768 | break; |
2769 | default: | |
f73fabfd | 2770 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2771 | goto error; |
2772 | } | |
2773 | ||
2f77fc4b | 2774 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2775 | strncat(consumer->subdir, dir_name, |
2776 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2777 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2778 | ||
f73fabfd | 2779 | ret = LTTNG_OK; |
54d01ffb DG |
2780 | |
2781 | error: | |
2782 | return ret; | |
2783 | } | |
2784 | ||
00e2e675 | 2785 | /* |
2f77fc4b | 2786 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2787 | * |
2788 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2789 | */ |
2f77fc4b DG |
2790 | static int create_ust_session(struct ltt_session *session, |
2791 | struct lttng_domain *domain) | |
00e2e675 DG |
2792 | { |
2793 | int ret; | |
2f77fc4b | 2794 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2795 | |
a4b92340 | 2796 | assert(session); |
2f77fc4b DG |
2797 | assert(domain); |
2798 | assert(session->consumer); | |
a4b92340 | 2799 | |
2f77fc4b | 2800 | switch (domain->type) { |
f20baf8e | 2801 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2802 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2803 | case LTTNG_DOMAIN_PYTHON: |
2f77fc4b DG |
2804 | case LTTNG_DOMAIN_UST: |
2805 | break; | |
2806 | default: | |
2807 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2808 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2809 | goto error; |
2810 | } | |
2811 | ||
2f77fc4b DG |
2812 | DBG("Creating UST session"); |
2813 | ||
dec56f6c | 2814 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2815 | if (lus == NULL) { |
f73fabfd | 2816 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2817 | goto error; |
2818 | } | |
2819 | ||
2f77fc4b DG |
2820 | lus->uid = session->uid; |
2821 | lus->gid = session->gid; | |
2bba9e53 | 2822 | lus->output_traces = session->output_traces; |
27babd3a | 2823 | lus->snapshot_mode = session->snapshot_mode; |
ecc48a90 | 2824 | lus->live_timer_interval = session->live_timer; |
2f77fc4b | 2825 | session->ust_session = lus; |
d7ba1388 | 2826 | if (session->shm_path[0]) { |
3d071855 MD |
2827 | strncpy(lus->root_shm_path, session->shm_path, |
2828 | sizeof(lus->root_shm_path)); | |
2829 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2830 | strncpy(lus->shm_path, session->shm_path, |
2831 | sizeof(lus->shm_path)); | |
2832 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
2833 | strncat(lus->shm_path, "/ust", | |
2834 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
2835 | } | |
2f77fc4b DG |
2836 | /* Copy session output to the newly created UST session */ |
2837 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2838 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2839 | goto error; |
2840 | } | |
2841 | ||
f73fabfd | 2842 | return LTTNG_OK; |
00e2e675 DG |
2843 | |
2844 | error: | |
2f77fc4b DG |
2845 | free(lus); |
2846 | session->ust_session = NULL; | |
00e2e675 DG |
2847 | return ret; |
2848 | } | |
2849 | ||
2850 | /* | |
2f77fc4b | 2851 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2852 | */ |
2f77fc4b | 2853 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2854 | { |
2855 | int ret; | |
a4b92340 | 2856 | |
2f77fc4b | 2857 | DBG("Creating kernel session"); |
00e2e675 | 2858 | |
2f77fc4b DG |
2859 | ret = kernel_create_session(session, kernel_tracer_fd); |
2860 | if (ret < 0) { | |
f73fabfd | 2861 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2862 | goto error; |
2863 | } | |
2864 | ||
2f77fc4b DG |
2865 | /* Code flow safety */ |
2866 | assert(session->kernel_session); | |
2867 | ||
2868 | /* Copy session output to the newly created Kernel session */ | |
2869 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2870 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2871 | goto error; |
2872 | } | |
2873 | ||
2f77fc4b DG |
2874 | session->kernel_session->uid = session->uid; |
2875 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2876 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2877 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2878 | |
f73fabfd | 2879 | return LTTNG_OK; |
00e2e675 | 2880 | |
2f77fc4b DG |
2881 | error: |
2882 | trace_kernel_destroy_session(session->kernel_session); | |
2883 | session->kernel_session = NULL; | |
2884 | return ret; | |
2885 | } | |
00e2e675 | 2886 | |
2f77fc4b DG |
2887 | /* |
2888 | * Count number of session permitted by uid/gid. | |
2889 | */ | |
2890 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2891 | { | |
2892 | unsigned int i = 0; | |
2893 | struct ltt_session *session; | |
07424f16 | 2894 | |
2f77fc4b DG |
2895 | DBG("Counting number of available session for UID %d GID %d", |
2896 | uid, gid); | |
2897 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2898 | /* |
2f77fc4b | 2899 | * Only list the sessions the user can control. |
00e2e675 | 2900 | */ |
2f77fc4b DG |
2901 | if (!session_access_ok(session, uid, gid)) { |
2902 | continue; | |
2903 | } | |
2904 | i++; | |
a4b92340 | 2905 | } |
2f77fc4b | 2906 | return i; |
00e2e675 DG |
2907 | } |
2908 | ||
dcabc190 FD |
2909 | static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock, |
2910 | int *sock_error, struct lttng_event *event) | |
2911 | { | |
2912 | int fd, ret; | |
2913 | struct lttng_userspace_probe_location *probe_location; | |
87597c2c | 2914 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
dcabc190 FD |
2915 | struct lttng_dynamic_buffer probe_location_buffer; |
2916 | struct lttng_buffer_view buffer_view; | |
2917 | ||
2918 | /* | |
2919 | * Create a buffer to store the serialized version of the probe | |
2920 | * location. | |
2921 | */ | |
2922 | lttng_dynamic_buffer_init(&probe_location_buffer); | |
2923 | ret = lttng_dynamic_buffer_set_size(&probe_location_buffer, | |
2924 | cmd_ctx->lsm->u.enable.userspace_probe_location_len); | |
2925 | if (ret) { | |
2926 | ret = LTTNG_ERR_NOMEM; | |
2927 | goto error; | |
2928 | } | |
2929 | ||
2930 | /* | |
2931 | * Receive the probe location. | |
2932 | */ | |
2933 | ret = lttcomm_recv_unix_sock(sock, probe_location_buffer.data, | |
2934 | probe_location_buffer.size); | |
2935 | if (ret <= 0) { | |
2936 | DBG("Nothing recv() from client var len data... continuing"); | |
2937 | *sock_error = 1; | |
2938 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
2939 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2940 | goto error; | |
2941 | } | |
2942 | ||
2943 | buffer_view = lttng_buffer_view_from_dynamic_buffer( | |
2944 | &probe_location_buffer, 0, probe_location_buffer.size); | |
2945 | ||
2946 | /* | |
2947 | * Extract the probe location from the serialized version. | |
2948 | */ | |
2949 | ret = lttng_userspace_probe_location_create_from_buffer( | |
2950 | &buffer_view, &probe_location); | |
2951 | if (ret < 0) { | |
2952 | WARN("Failed to create a userspace probe location from the received buffer"); | |
2953 | lttng_dynamic_buffer_reset( &probe_location_buffer); | |
2954 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2955 | goto error; | |
2956 | } | |
2957 | ||
2958 | /* | |
2959 | * Receive the file descriptor to the target binary from the client. | |
2960 | */ | |
2961 | DBG("Receiving userspace probe target FD from client ..."); | |
2962 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
2963 | if (ret <= 0) { | |
2964 | DBG("Nothing recv() from client userspace probe fd... continuing"); | |
2965 | *sock_error = 1; | |
2966 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2967 | goto error; | |
2968 | } | |
2969 | ||
2970 | /* | |
2971 | * Set the file descriptor received from the client through the unix | |
2972 | * socket in the probe location. | |
2973 | */ | |
2974 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
2975 | if (!lookup) { | |
2976 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2977 | goto error; | |
2978 | } | |
2979 | ||
2980 | /* | |
2981 | * From the kernel tracer's perspective, all userspace probe event types | |
2982 | * are all the same: a file and an offset. | |
2983 | */ | |
2984 | switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) { | |
2985 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
2986 | ret = lttng_userspace_probe_location_function_set_binary_fd( | |
2987 | probe_location, fd); | |
2988 | break; | |
2989 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
2990 | ret = lttng_userspace_probe_location_tracepoint_set_binary_fd( | |
2991 | probe_location, fd); | |
2992 | break; | |
2993 | default: | |
2994 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2995 | goto error; | |
2996 | } | |
2997 | ||
2998 | if (ret) { | |
2999 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
3000 | goto error; | |
3001 | } | |
3002 | ||
3003 | /* Attach the probe location to the event. */ | |
3004 | ret = lttng_event_set_userspace_probe_location(event, probe_location); | |
3005 | if (ret) { | |
3006 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
3007 | goto error; | |
3008 | } | |
3009 | ||
3010 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
3011 | error: | |
3012 | return ret; | |
3013 | } | |
3014 | ||
5c408ad8 JD |
3015 | /* |
3016 | * Check if the current kernel tracer supports the session rotation feature. | |
3017 | * Return 1 if it does, 0 otherwise. | |
3018 | */ | |
3019 | static int check_rotate_compatible(void) | |
3020 | { | |
3021 | int ret = 1; | |
3022 | ||
3023 | if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) { | |
3024 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
3025 | ret = 0; | |
3026 | } | |
3027 | ||
3028 | return ret; | |
3029 | } | |
3030 | ||
54d01ffb DG |
3031 | /* |
3032 | * Process the command requested by the lttng client within the command | |
3033 | * context structure. This function make sure that the return structure (llm) | |
3034 | * is set and ready for transmission before returning. | |
3035 | * | |
3036 | * Return any error encountered or 0 for success. | |
53a80697 MD |
3037 | * |
3038 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
3039 | * |
3040 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 3041 | */ |
53a80697 MD |
3042 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
3043 | int *sock_error) | |
54d01ffb | 3044 | { |
f73fabfd | 3045 | int ret = LTTNG_OK; |
44d3bd01 | 3046 | int need_tracing_session = 1; |
2e09ba09 | 3047 | int need_domain; |
54d01ffb DG |
3048 | |
3049 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3050 | ||
3745d315 MD |
3051 | assert(!rcu_read_ongoing()); |
3052 | ||
53a80697 MD |
3053 | *sock_error = 0; |
3054 | ||
2e09ba09 MD |
3055 | switch (cmd_ctx->lsm->cmd_type) { |
3056 | case LTTNG_CREATE_SESSION: | |
27babd3a | 3057 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 3058 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 MD |
3059 | case LTTNG_DESTROY_SESSION: |
3060 | case LTTNG_LIST_SESSIONS: | |
3061 | case LTTNG_LIST_DOMAINS: | |
3062 | case LTTNG_START_TRACE: | |
3063 | case LTTNG_STOP_TRACE: | |
6d805429 | 3064 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
3065 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3066 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3067 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3068 | case LTTNG_SNAPSHOT_RECORD: | |
fb198a11 | 3069 | case LTTNG_SAVE_SESSION: |
d7ba1388 | 3070 | case LTTNG_SET_SESSION_SHM_PATH: |
eded6438 | 3071 | case LTTNG_REGENERATE_METADATA: |
c2561365 | 3072 | case LTTNG_REGENERATE_STATEDUMP: |
b3530820 JG |
3073 | case LTTNG_REGISTER_TRIGGER: |
3074 | case LTTNG_UNREGISTER_TRIGGER: | |
5c408ad8 | 3075 | case LTTNG_ROTATE_SESSION: |
d68c9a04 | 3076 | case LTTNG_ROTATION_GET_INFO: |
259c2674 | 3077 | case LTTNG_ROTATION_SET_SCHEDULE: |
66ea93b1 | 3078 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
2e09ba09 | 3079 | need_domain = 0; |
3aace903 | 3080 | break; |
2e09ba09 MD |
3081 | default: |
3082 | need_domain = 1; | |
3083 | } | |
3084 | ||
e6142f2e | 3085 | if (config.no_kernel && need_domain |
2e09ba09 | 3086 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { |
531d29f9 | 3087 | if (!is_root) { |
f73fabfd | 3088 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 3089 | } else { |
f73fabfd | 3090 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 3091 | } |
4fba7219 DG |
3092 | goto error; |
3093 | } | |
3094 | ||
8d3113b2 DG |
3095 | /* Deny register consumer if we already have a spawned consumer. */ |
3096 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
3097 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
3098 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 3099 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 3100 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
3101 | goto error; |
3102 | } | |
3103 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
3104 | } | |
3105 | ||
54d01ffb DG |
3106 | /* |
3107 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3108 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3109 | * command. |
3110 | */ | |
3111 | switch(cmd_ctx->lsm->cmd_type) { | |
3112 | case LTTNG_LIST_SESSIONS: | |
3113 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 3114 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
3115 | case LTTNG_LIST_DOMAINS: |
3116 | case LTTNG_LIST_CHANNELS: | |
3117 | case LTTNG_LIST_EVENTS: | |
834978fd | 3118 | case LTTNG_LIST_SYSCALLS: |
a5dfbb9d | 3119 | case LTTNG_LIST_TRACKER_PIDS: |
5cd0780d | 3120 | case LTTNG_DATA_PENDING: |
5c408ad8 | 3121 | case LTTNG_ROTATE_SESSION: |
d68c9a04 | 3122 | case LTTNG_ROTATION_GET_INFO: |
66ea93b1 | 3123 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
54d01ffb DG |
3124 | break; |
3125 | default: | |
3126 | /* Setup lttng message with no payload */ | |
6e10c9b9 | 3127 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); |
54d01ffb DG |
3128 | if (ret < 0) { |
3129 | /* This label does not try to unlock the session */ | |
3130 | goto init_setup_error; | |
3131 | } | |
3132 | } | |
3133 | ||
3134 | /* Commands that DO NOT need a session. */ | |
3135 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 3136 | case LTTNG_CREATE_SESSION: |
27babd3a | 3137 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 3138 | case LTTNG_CREATE_SESSION_LIVE: |
54d01ffb DG |
3139 | case LTTNG_LIST_SESSIONS: |
3140 | case LTTNG_LIST_TRACEPOINTS: | |
834978fd | 3141 | case LTTNG_LIST_SYSCALLS: |
f37d259d | 3142 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
fb198a11 | 3143 | case LTTNG_SAVE_SESSION: |
b3530820 JG |
3144 | case LTTNG_REGISTER_TRIGGER: |
3145 | case LTTNG_UNREGISTER_TRIGGER: | |
44d3bd01 | 3146 | need_tracing_session = 0; |
54d01ffb DG |
3147 | break; |
3148 | default: | |
3149 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
3150 | /* |
3151 | * We keep the session list lock across _all_ commands | |
3152 | * for now, because the per-session lock does not | |
3153 | * handle teardown properly. | |
3154 | */ | |
74babd95 | 3155 | session_lock_list(); |
54d01ffb DG |
3156 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
3157 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 3158 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
3159 | goto error; |
3160 | } else { | |
3161 | /* Acquire lock for the session */ | |
3162 | session_lock(cmd_ctx->session); | |
3163 | } | |
3164 | break; | |
3165 | } | |
b389abbe | 3166 | |
5f3ecf22 DG |
3167 | /* |
3168 | * Commands that need a valid session but should NOT create one if none | |
3169 | * exists. Instead of creating one and destroying it when the command is | |
3170 | * handled, process that right before so we save some round trip in useless | |
3171 | * code path. | |
3172 | */ | |
3173 | switch (cmd_ctx->lsm->cmd_type) { | |
3174 | case LTTNG_DISABLE_CHANNEL: | |
3175 | case LTTNG_DISABLE_EVENT: | |
5f3ecf22 DG |
3176 | switch (cmd_ctx->lsm->domain.type) { |
3177 | case LTTNG_DOMAIN_KERNEL: | |
3178 | if (!cmd_ctx->session->kernel_session) { | |
3179 | ret = LTTNG_ERR_NO_CHANNEL; | |
3180 | goto error; | |
3181 | } | |
3182 | break; | |
3183 | case LTTNG_DOMAIN_JUL: | |
5cdb6027 | 3184 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3185 | case LTTNG_DOMAIN_PYTHON: |
5f3ecf22 DG |
3186 | case LTTNG_DOMAIN_UST: |
3187 | if (!cmd_ctx->session->ust_session) { | |
3188 | ret = LTTNG_ERR_NO_CHANNEL; | |
3189 | goto error; | |
3190 | } | |
3191 | break; | |
3192 | default: | |
3193 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3194 | goto error; | |
3195 | } | |
3196 | default: | |
3197 | break; | |
3198 | } | |
3199 | ||
2e09ba09 MD |
3200 | if (!need_domain) { |
3201 | goto skip_domain; | |
3202 | } | |
a4b92340 | 3203 | |
54d01ffb DG |
3204 | /* |
3205 | * Check domain type for specific "pre-action". | |
3206 | */ | |
3207 | switch (cmd_ctx->lsm->domain.type) { | |
3208 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 3209 | if (!is_root) { |
f73fabfd | 3210 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
3211 | goto error; |
3212 | } | |
3213 | ||
54d01ffb | 3214 | /* Kernel tracer check */ |
a4b35e07 | 3215 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3216 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3217 | ret = init_kernel_tracer(); |
3218 | if (ret != 0) { | |
54d01ffb DG |
3219 | goto error; |
3220 | } | |
3221 | } | |
5eb91c98 | 3222 | |
5c827ce0 DG |
3223 | /* Consumer is in an ERROR state. Report back to client */ |
3224 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3225 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3226 | goto error; |
3227 | } | |
3228 | ||
54d01ffb | 3229 | /* Need a session for kernel command */ |
44d3bd01 | 3230 | if (need_tracing_session) { |
54d01ffb | 3231 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3232 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3233 | if (ret < 0) { |
f73fabfd | 3234 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
3235 | goto error; |
3236 | } | |
b389abbe | 3237 | } |
7d29a247 | 3238 | |
54d01ffb | 3239 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3240 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3241 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 3242 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3243 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3244 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3245 | if (ret < 0) { |
f73fabfd | 3246 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 3247 | goto error; |
950131af | 3248 | } |
5c827ce0 | 3249 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
3250 | } else { |
3251 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3252 | } |
173af62f | 3253 | |
a4b92340 DG |
3254 | /* |
3255 | * The consumer was just spawned so we need to add the socket to | |
3256 | * the consumer output of the session if exist. | |
3257 | */ | |
3258 | ret = consumer_create_socket(&kconsumer_data, | |
3259 | cmd_ctx->session->kernel_session->consumer); | |
3260 | if (ret < 0) { | |
3261 | goto error; | |
173af62f | 3262 | } |
0d0c377a | 3263 | } |
5c827ce0 | 3264 | |
54d01ffb | 3265 | break; |
b9dfb167 | 3266 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3267 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3268 | case LTTNG_DOMAIN_PYTHON: |
2bdd86d4 | 3269 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3270 | { |
b51ec5b4 MD |
3271 | if (!ust_app_supported()) { |
3272 | ret = LTTNG_ERR_NO_UST; | |
3273 | goto error; | |
3274 | } | |
5c827ce0 DG |
3275 | /* Consumer is in an ERROR state. Report back to client */ |
3276 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3277 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3278 | goto error; |
3279 | } | |
3280 | ||
44d3bd01 | 3281 | if (need_tracing_session) { |
a4b92340 | 3282 | /* Create UST session if none exist. */ |
f6a9efaa | 3283 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3284 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3285 | &cmd_ctx->lsm->domain); |
f73fabfd | 3286 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
3287 | goto error; |
3288 | } | |
3289 | } | |
00e2e675 | 3290 | |
7753dea8 MD |
3291 | /* Start the UST consumer daemons */ |
3292 | /* 64-bit */ | |
3293 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
e6142f2e | 3294 | if (config.consumerd64_bin_path.value && |
7753dea8 | 3295 | ustconsumer64_data.pid == 0 && |
785d2d0d | 3296 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3297 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3298 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3299 | if (ret < 0) { |
f73fabfd | 3300 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 3301 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
3302 | goto error; |
3303 | } | |
48842b30 | 3304 | |
173af62f | 3305 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 3306 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 3307 | } else { |
7753dea8 MD |
3308 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3309 | } | |
173af62f DG |
3310 | |
3311 | /* | |
3312 | * Setup socket for consumer 64 bit. No need for atomic access | |
3313 | * since it was set above and can ONLY be set in this thread. | |
3314 | */ | |
a4b92340 DG |
3315 | ret = consumer_create_socket(&ustconsumer64_data, |
3316 | cmd_ctx->session->ust_session->consumer); | |
3317 | if (ret < 0) { | |
3318 | goto error; | |
173af62f DG |
3319 | } |
3320 | ||
7753dea8 | 3321 | /* 32-bit */ |
385b881b | 3322 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); |
e6142f2e | 3323 | if (config.consumerd32_bin_path.value && |
7753dea8 | 3324 | ustconsumer32_data.pid == 0 && |
785d2d0d | 3325 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3326 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
3327 | ret = start_consumerd(&ustconsumer32_data); | |
3328 | if (ret < 0) { | |
f73fabfd | 3329 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 3330 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
3331 | goto error; |
3332 | } | |
5c827ce0 | 3333 | |
173af62f | 3334 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 3335 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
3336 | } else { |
3337 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3338 | } |
173af62f DG |
3339 | |
3340 | /* | |
92816cc3 | 3341 | * Setup socket for consumer 32 bit. No need for atomic access |
173af62f DG |
3342 | * since it was set above and can ONLY be set in this thread. |
3343 | */ | |
a4b92340 DG |
3344 | ret = consumer_create_socket(&ustconsumer32_data, |
3345 | cmd_ctx->session->ust_session->consumer); | |
3346 | if (ret < 0) { | |
3347 | goto error; | |
173af62f | 3348 | } |
44d3bd01 DG |
3349 | } |
3350 | break; | |
48842b30 | 3351 | } |
54d01ffb | 3352 | default: |
54d01ffb DG |
3353 | break; |
3354 | } | |
2e09ba09 | 3355 | skip_domain: |
33a2b854 | 3356 | |
5c827ce0 DG |
3357 | /* Validate consumer daemon state when start/stop trace command */ |
3358 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
3359 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
3360 | switch (cmd_ctx->lsm->domain.type) { | |
e7619875 JG |
3361 | case LTTNG_DOMAIN_NONE: |
3362 | break; | |
b9dfb167 | 3363 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3364 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3365 | case LTTNG_DOMAIN_PYTHON: |
5c827ce0 DG |
3366 | case LTTNG_DOMAIN_UST: |
3367 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3368 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3369 | goto error; |
3370 | } | |
3371 | break; | |
3372 | case LTTNG_DOMAIN_KERNEL: | |
3373 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3374 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3375 | goto error; |
3376 | } | |
3377 | break; | |
825535cc JG |
3378 | default: |
3379 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3380 | goto error; | |
5c827ce0 DG |
3381 | } |
3382 | } | |
3383 | ||
8e0af1b4 MD |
3384 | /* |
3385 | * Check that the UID or GID match that of the tracing session. | |
3386 | * The root user can interact with all sessions. | |
3387 | */ | |
3388 | if (need_tracing_session) { | |
3389 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
3390 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3391 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 3392 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
3393 | goto error; |
3394 | } | |
3395 | } | |
3396 | ||
ffe60014 DG |
3397 | /* |
3398 | * Send relayd information to consumer as soon as we have a domain and a | |
3399 | * session defined. | |
3400 | */ | |
3401 | if (cmd_ctx->session && need_domain) { | |
3402 | /* | |
3403 | * Setup relayd if not done yet. If the relayd information was already | |
3404 | * sent to the consumer, this call will gracefully return. | |
3405 | */ | |
3406 | ret = cmd_setup_relayd(cmd_ctx->session); | |
3407 | if (ret != LTTNG_OK) { | |
3408 | goto error; | |
3409 | } | |
3410 | } | |
3411 | ||
54d01ffb DG |
3412 | /* Process by command type */ |
3413 | switch (cmd_ctx->lsm->cmd_type) { | |
3414 | case LTTNG_ADD_CONTEXT: | |
3415 | { | |
2001793c JG |
3416 | /* |
3417 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
3418 | * payload if the context being added is an application context. | |
3419 | */ | |
3420 | if (cmd_ctx->lsm->u.context.ctx.ctx == | |
3421 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
3422 | char *provider_name = NULL, *context_name = NULL; | |
3423 | size_t provider_name_len = | |
3424 | cmd_ctx->lsm->u.context.provider_name_len; | |
3425 | size_t context_name_len = | |
3426 | cmd_ctx->lsm->u.context.context_name_len; | |
3427 | ||
3428 | if (provider_name_len == 0 || context_name_len == 0) { | |
3429 | /* | |
3430 | * Application provider and context names MUST | |
3431 | * be provided. | |
3432 | */ | |
3433 | ret = -LTTNG_ERR_INVALID; | |
3434 | goto error; | |
3435 | } | |
3436 | ||
3437 | provider_name = zmalloc(provider_name_len + 1); | |
3438 | if (!provider_name) { | |
3439 | ret = -LTTNG_ERR_NOMEM; | |
3440 | goto error; | |
3441 | } | |
e0f4d107 JG |
3442 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = |
3443 | provider_name; | |
2001793c JG |
3444 | |
3445 | context_name = zmalloc(context_name_len + 1); | |
3446 | if (!context_name) { | |
3447 | ret = -LTTNG_ERR_NOMEM; | |
3448 | goto error_add_context; | |
3449 | } | |
e0f4d107 JG |
3450 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = |
3451 | context_name; | |
2001793c JG |
3452 | |
3453 | ret = lttcomm_recv_unix_sock(sock, provider_name, | |
3454 | provider_name_len); | |
3455 | if (ret < 0) { | |
3456 | goto error_add_context; | |
3457 | } | |
3458 | ||
3459 | ret = lttcomm_recv_unix_sock(sock, context_name, | |
3460 | context_name_len); | |
3461 | if (ret < 0) { | |
3462 | goto error_add_context; | |
3463 | } | |
2001793c JG |
3464 | } |
3465 | ||
3466 | /* | |
3467 | * cmd_add_context assumes ownership of the provider and context | |
3468 | * names. | |
3469 | */ | |
3470 | ret = cmd_add_context(cmd_ctx->session, | |
3471 | cmd_ctx->lsm->domain.type, | |
54d01ffb | 3472 | cmd_ctx->lsm->u.context.channel_name, |
2001793c JG |
3473 | &cmd_ctx->lsm->u.context.ctx, |
3474 | kernel_poll_pipe[1]); | |
3475 | ||
3476 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL; | |
3477 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL; | |
3478 | error_add_context: | |
3479 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name); | |
3480 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name); | |
3481 | if (ret < 0) { | |
3482 | goto error; | |
3483 | } | |
54d01ffb DG |
3484 | break; |
3485 | } | |
3486 | case LTTNG_DISABLE_CHANNEL: | |
3487 | { | |
3488 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3489 | cmd_ctx->lsm->u.disable.channel_name); | |
3490 | break; | |
3491 | } | |
3492 | case LTTNG_DISABLE_EVENT: | |
3493 | { | |
47b7e2f9 JG |
3494 | |
3495 | /* | |
3496 | * FIXME: handle filter; for now we just receive the filter's | |
3497 | * bytecode along with the filter expression which are sent by | |
3498 | * liblttng-ctl and discard them. | |
3499 | * | |
3500 | * This fixes an issue where the client may block while sending | |
3501 | * the filter payload and encounter an error because the session | |
3502 | * daemon closes the socket without ever handling this data. | |
3503 | */ | |
3504 | size_t count = cmd_ctx->lsm->u.disable.expression_len + | |
3505 | cmd_ctx->lsm->u.disable.bytecode_len; | |
3506 | ||
3507 | if (count) { | |
3508 | char data[LTTNG_FILTER_MAX_LEN]; | |
3509 | ||
3510 | DBG("Discarding disable event command payload of size %zu", count); | |
3511 | while (count) { | |
3512 | ret = lttcomm_recv_unix_sock(sock, data, | |
3513 | count > sizeof(data) ? sizeof(data) : count); | |
3514 | if (ret < 0) { | |
3515 | goto error; | |
3516 | } | |
3517 | ||
3518 | count -= (size_t) ret; | |
3519 | } | |
3520 | } | |
6e911cad | 3521 | /* FIXME: passing packed structure to non-packed pointer */ |
54d01ffb DG |
3522 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3523 | cmd_ctx->lsm->u.disable.channel_name, | |
6e911cad | 3524 | &cmd_ctx->lsm->u.disable.event); |
33a2b854 DG |
3525 | break; |
3526 | } | |
54d01ffb DG |
3527 | case LTTNG_ENABLE_CHANNEL: |
3528 | { | |
b3530820 JG |
3529 | cmd_ctx->lsm->u.channel.chan.attr.extended.ptr = |
3530 | (struct lttng_channel_extended *) &cmd_ctx->lsm->u.channel.extended; | |
7972aab2 | 3531 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
b3530820 JG |
3532 | &cmd_ctx->lsm->u.channel.chan, |
3533 | kernel_poll_pipe[1]); | |
54d01ffb DG |
3534 | break; |
3535 | } | |
ccf10263 MD |
3536 | case LTTNG_TRACK_PID: |
3537 | { | |
3538 | ret = cmd_track_pid(cmd_ctx->session, | |
3539 | cmd_ctx->lsm->domain.type, | |
3540 | cmd_ctx->lsm->u.pid_tracker.pid); | |
3541 | break; | |
3542 | } | |
3543 | case LTTNG_UNTRACK_PID: | |
3544 | { | |
3545 | ret = cmd_untrack_pid(cmd_ctx->session, | |
3546 | cmd_ctx->lsm->domain.type, | |
3547 | cmd_ctx->lsm->u.pid_tracker.pid); | |
3548 | break; | |
3549 | } | |
54d01ffb DG |
3550 | case LTTNG_ENABLE_EVENT: |
3551 | { | |
dcabc190 | 3552 | struct lttng_event *ev = NULL; |
882ef835 JI |
3553 | struct lttng_event_exclusion *exclusion = NULL; |
3554 | struct lttng_filter_bytecode *bytecode = NULL; | |
6b453b5e | 3555 | char *filter_expression = NULL; |
882ef835 | 3556 | |
67676bd8 DG |
3557 | /* Handle exclusion events and receive it from the client. */ |
3558 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { | |
3559 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; | |
3560 | ||
3561 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
3562 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
3563 | if (!exclusion) { | |
3564 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
3565 | goto error; | |
882ef835 | 3566 | } |
882ef835 | 3567 | |
67676bd8 DG |
3568 | DBG("Receiving var len exclusion event list from client ..."); |
3569 | exclusion->count = count; | |
3570 | ret = lttcomm_recv_unix_sock(sock, exclusion->names, | |
3571 | count * LTTNG_SYMBOL_NAME_LEN); | |
3572 | if (ret <= 0) { | |
3573 | DBG("Nothing recv() from client var len data... continuing"); | |
3574 | *sock_error = 1; | |
3575 | free(exclusion); | |
3576 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
3577 | goto error; | |
3578 | } | |
3579 | } | |
3580 | ||
6b453b5e JG |
3581 | /* Get filter expression from client. */ |
3582 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { | |
3583 | size_t expression_len = | |
3584 | cmd_ctx->lsm->u.enable.expression_len; | |
3585 | ||
3586 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
3587 | ret = LTTNG_ERR_FILTER_INVAL; | |
3588 | free(exclusion); | |
3589 | goto error; | |
3590 | } | |
3591 | ||
3592 | filter_expression = zmalloc(expression_len); | |
3593 | if (!filter_expression) { | |
3594 | free(exclusion); | |
3595 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3596 | goto error; | |
3597 | } | |
3598 | ||
3599 | /* Receive var. len. data */ | |
3600 | DBG("Receiving var len filter's expression from client ..."); | |
3601 | ret = lttcomm_recv_unix_sock(sock, filter_expression, | |
3602 | expression_len); | |
3603 | if (ret <= 0) { | |
dcabc190 | 3604 | DBG("Nothing recv() from client var len data... continuing"); |
6b453b5e JG |
3605 | *sock_error = 1; |
3606 | free(filter_expression); | |
3607 | free(exclusion); | |
3608 | ret = LTTNG_ERR_FILTER_INVAL; | |
3609 | goto error; | |
3610 | } | |
3611 | } | |
3612 | ||
67676bd8 DG |
3613 | /* Handle filter and get bytecode from client. */ |
3614 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { | |
3615 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; | |
3616 | ||
3617 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
3618 | ret = LTTNG_ERR_FILTER_INVAL; | |
49d21f93 | 3619 | free(filter_expression); |
67676bd8 DG |
3620 | free(exclusion); |
3621 | goto error; | |
3622 | } | |
3623 | ||
3624 | bytecode = zmalloc(bytecode_len); | |
3625 | if (!bytecode) { | |
49d21f93 | 3626 | free(filter_expression); |
67676bd8 DG |
3627 | free(exclusion); |
3628 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3629 | goto error; | |
882ef835 JI |
3630 | } |
3631 | ||
67676bd8 DG |
3632 | /* Receive var. len. data */ |
3633 | DBG("Receiving var len filter's bytecode from client ..."); | |
3634 | ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len); | |
3635 | if (ret <= 0) { | |
dcabc190 | 3636 | DBG("Nothing recv() from client var len data... continuing"); |
67676bd8 | 3637 | *sock_error = 1; |
49d21f93 | 3638 | free(filter_expression); |
67676bd8 DG |
3639 | free(bytecode); |
3640 | free(exclusion); | |
3641 | ret = LTTNG_ERR_FILTER_INVAL; | |
3642 | goto error; | |
3643 | } | |
3644 | ||
3645 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
49d21f93 | 3646 | free(filter_expression); |
67676bd8 DG |
3647 | free(bytecode); |
3648 | free(exclusion); | |
3649 | ret = LTTNG_ERR_FILTER_INVAL; | |
3650 | goto error; | |
3651 | } | |
882ef835 | 3652 | } |
67676bd8 | 3653 | |
dcabc190 FD |
3654 | ev = lttng_event_copy(&cmd_ctx->lsm->u.enable.event); |
3655 | if (!ev) { | |
3656 | DBG("Failed to copy event: %s", | |
3657 | cmd_ctx->lsm->u.enable.event.name); | |
5ae0c80e JG |
3658 | free(filter_expression); |
3659 | free(bytecode); | |
3660 | free(exclusion); | |
dcabc190 FD |
3661 | ret = LTTNG_ERR_NOMEM; |
3662 | goto error; | |
3663 | } | |
3664 | ||
3665 | ||
3666 | if (cmd_ctx->lsm->u.enable.userspace_probe_location_len > 0) { | |
3667 | /* Expect a userspace probe description. */ | |
3668 | ret = receive_userspace_probe(cmd_ctx, sock, sock_error, ev); | |
3669 | if (ret) { | |
5ae0c80e JG |
3670 | free(filter_expression); |
3671 | free(bytecode); | |
3672 | free(exclusion); | |
dcabc190 FD |
3673 | lttng_event_destroy(ev); |
3674 | goto error; | |
3675 | } | |
3676 | } | |
3677 | ||
67676bd8 DG |
3678 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
3679 | cmd_ctx->lsm->u.enable.channel_name, | |
dcabc190 | 3680 | ev, |
6b453b5e | 3681 | filter_expression, bytecode, exclusion, |
67676bd8 | 3682 | kernel_poll_pipe[1]); |
dcabc190 | 3683 | lttng_event_destroy(ev); |
54d01ffb DG |
3684 | break; |
3685 | } | |
052da939 | 3686 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3687 | { |
9f19cc17 | 3688 | struct lttng_event *events; |
54d01ffb | 3689 | ssize_t nb_events; |
052da939 | 3690 | |
0845bbfa | 3691 | session_lock_list(); |
54d01ffb | 3692 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
0845bbfa | 3693 | session_unlock_list(); |
54d01ffb | 3694 | if (nb_events < 0) { |
f73fabfd | 3695 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3696 | ret = -nb_events; |
3697 | goto error; | |
2ef84c95 DG |
3698 | } |
3699 | ||
3700 | /* | |
3701 | * Setup lttng message with payload size set to the event list size in | |
3702 | * bytes and then copy list into the llm payload. | |
3703 | */ | |
6e10c9b9 PP |
3704 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
3705 | sizeof(struct lttng_event) * nb_events); | |
3706 | free(events); | |
3707 | ||
2ef84c95 DG |
3708 | if (ret < 0) { |
3709 | goto setup_error; | |
3710 | } | |
3711 | ||
f73fabfd | 3712 | ret = LTTNG_OK; |
2ef84c95 DG |
3713 | break; |
3714 | } | |
f37d259d MD |
3715 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
3716 | { | |
3717 | struct lttng_event_field *fields; | |
3718 | ssize_t nb_fields; | |
3719 | ||
0845bbfa | 3720 | session_lock_list(); |
a4b92340 DG |
3721 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
3722 | &fields); | |
0845bbfa | 3723 | session_unlock_list(); |
f37d259d | 3724 | if (nb_fields < 0) { |
f73fabfd | 3725 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
3726 | ret = -nb_fields; |
3727 | goto error; | |
3728 | } | |
3729 | ||
3730 | /* | |
3731 | * Setup lttng message with payload size set to the event list size in | |
3732 | * bytes and then copy list into the llm payload. | |
3733 | */ | |
6e10c9b9 | 3734 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, |
a4b92340 | 3735 | sizeof(struct lttng_event_field) * nb_fields); |
6e10c9b9 PP |
3736 | free(fields); |
3737 | ||
f37d259d | 3738 | if (ret < 0) { |
f37d259d MD |
3739 | goto setup_error; |
3740 | } | |
3741 | ||
f73fabfd | 3742 | ret = LTTNG_OK; |
f37d259d MD |
3743 | break; |
3744 | } | |
834978fd DG |
3745 | case LTTNG_LIST_SYSCALLS: |
3746 | { | |
3747 | struct lttng_event *events; | |
3748 | ssize_t nb_events; | |
3749 | ||
3750 | nb_events = cmd_list_syscalls(&events); | |
3751 | if (nb_events < 0) { | |
3752 | /* Return value is a negative lttng_error_code. */ | |
3753 | ret = -nb_events; | |
3754 | goto error; | |
3755 | } | |
3756 | ||
3757 | /* | |
3758 | * Setup lttng message with payload size set to the event list size in | |
3759 | * bytes and then copy list into the llm payload. | |
3760 | */ | |
6e10c9b9 PP |
3761 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
3762 | sizeof(struct lttng_event) * nb_events); | |
3763 | free(events); | |
3764 | ||
834978fd | 3765 | if (ret < 0) { |
834978fd DG |
3766 | goto setup_error; |
3767 | } | |
3768 | ||
834978fd DG |
3769 | ret = LTTNG_OK; |
3770 | break; | |
3771 | } | |
a5dfbb9d MD |
3772 | case LTTNG_LIST_TRACKER_PIDS: |
3773 | { | |
3774 | int32_t *pids = NULL; | |
3775 | ssize_t nr_pids; | |
3776 | ||
3777 | nr_pids = cmd_list_tracker_pids(cmd_ctx->session, | |
3778 | cmd_ctx->lsm->domain.type, &pids); | |
3779 | if (nr_pids < 0) { | |
3780 | /* Return value is a negative lttng_error_code. */ | |
3781 | ret = -nr_pids; | |
3782 | goto error; | |
3783 | } | |
3784 | ||
3785 | /* | |
3786 | * Setup lttng message with payload size set to the event list size in | |
3787 | * bytes and then copy list into the llm payload. | |
3788 | */ | |
6e10c9b9 PP |
3789 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, pids, |
3790 | sizeof(int32_t) * nr_pids); | |
3791 | free(pids); | |
3792 | ||
a5dfbb9d | 3793 | if (ret < 0) { |
a5dfbb9d MD |
3794 | goto setup_error; |
3795 | } | |
3796 | ||
a5dfbb9d MD |
3797 | ret = LTTNG_OK; |
3798 | break; | |
3799 | } | |
00e2e675 DG |
3800 | case LTTNG_SET_CONSUMER_URI: |
3801 | { | |
a4b92340 DG |
3802 | size_t nb_uri, len; |
3803 | struct lttng_uri *uris; | |
3804 | ||
3805 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3806 | len = nb_uri * sizeof(struct lttng_uri); | |
3807 | ||
3808 | if (nb_uri == 0) { | |
f73fabfd | 3809 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
3810 | goto error; |
3811 | } | |
3812 | ||
3813 | uris = zmalloc(len); | |
3814 | if (uris == NULL) { | |
f73fabfd | 3815 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3816 | goto error; |
3817 | } | |
3818 | ||
3819 | /* Receive variable len data */ | |
77c7c900 | 3820 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
3821 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3822 | if (ret <= 0) { | |
3823 | DBG("No URIs received from client... continuing"); | |
3824 | *sock_error = 1; | |
f73fabfd | 3825 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3826 | free(uris); |
a4b92340 DG |
3827 | goto error; |
3828 | } | |
3829 | ||
bda32d56 JG |
3830 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); |
3831 | free(uris); | |
f73fabfd | 3832 | if (ret != LTTNG_OK) { |
a4b92340 DG |
3833 | goto error; |
3834 | } | |
3835 | ||
b1d41407 | 3836 | |
00e2e675 DG |
3837 | break; |
3838 | } | |
f3ed775e | 3839 | case LTTNG_START_TRACE: |
8c0faa1d | 3840 | { |
259c2674 JD |
3841 | /* |
3842 | * On the first start, if we have a kernel session and we have | |
3843 | * enabled time or size-based rotations, we have to make sure | |
3844 | * the kernel tracer supports it. | |
3845 | */ | |
3846 | if (!cmd_ctx->session->has_been_started && \ | |
3847 | cmd_ctx->session->kernel_session && \ | |
3848 | (cmd_ctx->session->rotate_timer_period || \ | |
3849 | cmd_ctx->session->rotate_size) && \ | |
3850 | !check_rotate_compatible()) { | |
3851 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
3852 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
3853 | goto error; | |
3854 | } | |
54d01ffb | 3855 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3856 | break; |
3857 | } | |
f3ed775e | 3858 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3859 | { |
54d01ffb | 3860 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3861 | break; |
3862 | } | |
5e16da05 MD |
3863 | case LTTNG_CREATE_SESSION: |
3864 | { | |
a4b92340 DG |
3865 | size_t nb_uri, len; |
3866 | struct lttng_uri *uris = NULL; | |
3867 | ||
3868 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3869 | len = nb_uri * sizeof(struct lttng_uri); | |
3870 | ||
3871 | if (nb_uri > 0) { | |
3872 | uris = zmalloc(len); | |
3873 | if (uris == NULL) { | |
f73fabfd | 3874 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3875 | goto error; |
3876 | } | |
3877 | ||
3878 | /* Receive variable len data */ | |
77c7c900 | 3879 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3880 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3881 | if (ret <= 0) { | |
3882 | DBG("No URIs received from client... continuing"); | |
3883 | *sock_error = 1; | |
f73fabfd | 3884 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3885 | free(uris); |
a4b92340 DG |
3886 | goto error; |
3887 | } | |
3888 | ||
3889 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3890 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3891 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3892 | free(uris); |
a4b92340 DG |
3893 | goto error; |
3894 | } | |
3895 | } | |
3896 | ||
3897 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
ecc48a90 | 3898 | &cmd_ctx->creds, 0); |
a4b92340 | 3899 | |
b1d41407 DG |
3900 | free(uris); |
3901 | ||
00e2e675 DG |
3902 | break; |
3903 | } | |
5e16da05 MD |
3904 | case LTTNG_DESTROY_SESSION: |
3905 | { | |
90936dcf JD |
3906 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1], |
3907 | notification_thread_handle); | |
a4b92340 DG |
3908 | |
3909 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 3910 | cmd_ctx->session = NULL; |
5461b305 | 3911 | break; |
5e16da05 | 3912 | } |
9f19cc17 | 3913 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3914 | { |
54d01ffb | 3915 | ssize_t nb_dom; |
fa64dfb4 | 3916 | struct lttng_domain *domains = NULL; |
5461b305 | 3917 | |
54d01ffb DG |
3918 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3919 | if (nb_dom < 0) { | |
f73fabfd | 3920 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3921 | ret = -nb_dom; |
3922 | goto error; | |
ce3d728c | 3923 | } |
520ff687 | 3924 | |
6e10c9b9 PP |
3925 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, |
3926 | nb_dom * sizeof(struct lttng_domain)); | |
3927 | free(domains); | |
3928 | ||
5461b305 DG |
3929 | if (ret < 0) { |
3930 | goto setup_error; | |
520ff687 | 3931 | } |
57167058 | 3932 | |
f73fabfd | 3933 | ret = LTTNG_OK; |
5e16da05 MD |
3934 | break; |
3935 | } | |
9f19cc17 | 3936 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3937 | { |
53e367f9 | 3938 | ssize_t payload_size; |
ade7ce52 | 3939 | struct lttng_channel *channels = NULL; |
54d01ffb | 3940 | |
53e367f9 | 3941 | payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type, |
b551a063 | 3942 | cmd_ctx->session, &channels); |
53e367f9 | 3943 | if (payload_size < 0) { |
f73fabfd | 3944 | /* Return value is a negative lttng_error_code. */ |
53e367f9 | 3945 | ret = -payload_size; |
54d01ffb | 3946 | goto error; |
5461b305 | 3947 | } |
ca95a216 | 3948 | |
6e10c9b9 | 3949 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, |
53e367f9 | 3950 | payload_size); |
6e10c9b9 PP |
3951 | free(channels); |
3952 | ||
5461b305 DG |
3953 | if (ret < 0) { |
3954 | goto setup_error; | |
3955 | } | |
9f19cc17 | 3956 | |
f73fabfd | 3957 | ret = LTTNG_OK; |
5461b305 | 3958 | break; |
5e16da05 | 3959 | } |
9f19cc17 | 3960 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3961 | { |
b551a063 | 3962 | ssize_t nb_event; |
684d34d2 | 3963 | struct lttng_event *events = NULL; |
b4e3ceb9 PP |
3964 | struct lttcomm_event_command_header cmd_header; |
3965 | size_t total_size; | |
3966 | ||
b2d66287 | 3967 | memset(&cmd_header, 0, sizeof(cmd_header)); |
b4e3ceb9 PP |
3968 | /* Extended infos are included at the end of events */ |
3969 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, | |
3970 | cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name, | |
3971 | &events, &total_size); | |
9f19cc17 | 3972 | |
54d01ffb | 3973 | if (nb_event < 0) { |
f73fabfd | 3974 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3975 | ret = -nb_event; |
3976 | goto error; | |
5461b305 | 3977 | } |
ca95a216 | 3978 | |
b4e3ceb9 PP |
3979 | cmd_header.nb_events = nb_event; |
3980 | ret = setup_lttng_msg(cmd_ctx, events, total_size, | |
3981 | &cmd_header, sizeof(cmd_header)); | |
6e10c9b9 PP |
3982 | free(events); |
3983 | ||
5461b305 DG |
3984 | if (ret < 0) { |
3985 | goto setup_error; | |
3986 | } | |
9f19cc17 | 3987 | |
f73fabfd | 3988 | ret = LTTNG_OK; |
5461b305 | 3989 | break; |
5e16da05 MD |
3990 | } |
3991 | case LTTNG_LIST_SESSIONS: | |
3992 | { | |
8e0af1b4 | 3993 | unsigned int nr_sessions; |
6e10c9b9 PP |
3994 | void *sessions_payload; |
3995 | size_t payload_len; | |
5461b305 | 3996 | |
8e0af1b4 | 3997 | session_lock_list(); |
730389d9 DG |
3998 | nr_sessions = lttng_sessions_count( |
3999 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
4000 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6e10c9b9 PP |
4001 | payload_len = sizeof(struct lttng_session) * nr_sessions; |
4002 | sessions_payload = zmalloc(payload_len); | |
d32fb093 | 4003 | |
6e10c9b9 | 4004 | if (!sessions_payload) { |
54d01ffb | 4005 | session_unlock_list(); |
6e10c9b9 | 4006 | ret = -ENOMEM; |
5461b305 | 4007 | goto setup_error; |
e065084a | 4008 | } |
5e16da05 | 4009 | |
6e10c9b9 | 4010 | cmd_list_lttng_sessions(sessions_payload, |
730389d9 DG |
4011 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
4012 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
54d01ffb | 4013 | session_unlock_list(); |
5e16da05 | 4014 | |
6e10c9b9 PP |
4015 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, |
4016 | payload_len); | |
4017 | free(sessions_payload); | |
4018 | ||
4019 | if (ret < 0) { | |
4020 | goto setup_error; | |
4021 | } | |
4022 | ||
f73fabfd | 4023 | ret = LTTNG_OK; |
5e16da05 MD |
4024 | break; |
4025 | } | |
d9800920 DG |
4026 | case LTTNG_REGISTER_CONSUMER: |
4027 | { | |
2f77fc4b DG |
4028 | struct consumer_data *cdata; |
4029 | ||
4030 | switch (cmd_ctx->lsm->domain.type) { | |
4031 | case LTTNG_DOMAIN_KERNEL: | |
4032 | cdata = &kconsumer_data; | |
4033 | break; | |
4034 | default: | |
f73fabfd | 4035 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
4036 | goto error; |
4037 | } | |
4038 | ||
54d01ffb | 4039 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 4040 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
4041 | break; |
4042 | } | |
6d805429 | 4043 | case LTTNG_DATA_PENDING: |
806e2684 | 4044 | { |
f6151c55 | 4045 | int pending_ret; |
6e10c9b9 | 4046 | uint8_t pending_ret_byte; |
f6151c55 JG |
4047 | |
4048 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
6e10c9b9 | 4049 | |
f6151c55 JG |
4050 | /* |
4051 | * FIXME | |
4052 | * | |
4053 | * This function may returns 0 or 1 to indicate whether or not | |
4054 | * there is data pending. In case of error, it should return an | |
4055 | * LTTNG_ERR code. However, some code paths may still return | |
4056 | * a nondescript error code, which we handle by returning an | |
4057 | * "unknown" error. | |
4058 | */ | |
4059 | if (pending_ret == 0 || pending_ret == 1) { | |
6e10c9b9 PP |
4060 | /* |
4061 | * ret will be set to LTTNG_OK at the end of | |
4062 | * this function. | |
4063 | */ | |
f6151c55 JG |
4064 | } else if (pending_ret < 0) { |
4065 | ret = LTTNG_ERR_UNK; | |
4066 | goto setup_error; | |
4067 | } else { | |
4068 | ret = pending_ret; | |
4069 | goto setup_error; | |
4070 | } | |
4071 | ||
6e10c9b9 PP |
4072 | pending_ret_byte = (uint8_t) pending_ret; |
4073 | ||
4074 | /* 1 byte to return whether or not data is pending */ | |
4075 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
4076 | &pending_ret_byte, 1); | |
4077 | ||
4078 | if (ret < 0) { | |
4079 | goto setup_error; | |
4080 | } | |
4081 | ||
4082 | ret = LTTNG_OK; | |
806e2684 DG |
4083 | break; |
4084 | } | |
da3c9ec1 DG |
4085 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
4086 | { | |
6dc3064a DG |
4087 | struct lttcomm_lttng_output_id reply; |
4088 | ||
4089 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
4090 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
4091 | if (ret != LTTNG_OK) { | |
4092 | goto error; | |
4093 | } | |
4094 | ||
6e10c9b9 PP |
4095 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, |
4096 | sizeof(reply)); | |
6dc3064a DG |
4097 | if (ret < 0) { |
4098 | goto setup_error; | |
4099 | } | |
4100 | ||
4101 | /* Copy output list into message payload */ | |
6dc3064a | 4102 | ret = LTTNG_OK; |
da3c9ec1 DG |
4103 | break; |
4104 | } | |
4105 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
4106 | { | |
6dc3064a DG |
4107 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
4108 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
4109 | break; |
4110 | } | |
4111 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
4112 | { | |
6dc3064a DG |
4113 | ssize_t nb_output; |
4114 | struct lttng_snapshot_output *outputs = NULL; | |
4115 | ||
4116 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
4117 | if (nb_output < 0) { | |
4118 | ret = -nb_output; | |
4119 | goto error; | |
4120 | } | |
4121 | ||
6e10c9b9 PP |
4122 | assert((nb_output > 0 && outputs) || nb_output == 0); |
4123 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
6dc3064a | 4124 | nb_output * sizeof(struct lttng_snapshot_output)); |
6e10c9b9 PP |
4125 | free(outputs); |
4126 | ||
6dc3064a | 4127 | if (ret < 0) { |
6dc3064a DG |
4128 | goto setup_error; |
4129 | } | |
4130 | ||
6dc3064a | 4131 | ret = LTTNG_OK; |
da3c9ec1 DG |
4132 | break; |
4133 | } | |
4134 | case LTTNG_SNAPSHOT_RECORD: | |
4135 | { | |
6dc3064a DG |
4136 | ret = cmd_snapshot_record(cmd_ctx->session, |
4137 | &cmd_ctx->lsm->u.snapshot_record.output, | |
4138 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
4139 | break; |
4140 | } | |
27babd3a DG |
4141 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
4142 | { | |
4143 | size_t nb_uri, len; | |
4144 | struct lttng_uri *uris = NULL; | |
4145 | ||
4146 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
4147 | len = nb_uri * sizeof(struct lttng_uri); | |
4148 | ||
4149 | if (nb_uri > 0) { | |
4150 | uris = zmalloc(len); | |
4151 | if (uris == NULL) { | |
4152 | ret = LTTNG_ERR_FATAL; | |
4153 | goto error; | |
4154 | } | |
4155 | ||
4156 | /* Receive variable len data */ | |
4157 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
4158 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
4159 | if (ret <= 0) { | |
4160 | DBG("No URIs received from client... continuing"); | |
4161 | *sock_error = 1; | |
4162 | ret = LTTNG_ERR_SESSION_FAIL; | |
4163 | free(uris); | |
4164 | goto error; | |
4165 | } | |
4166 | ||
4167 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
4168 | DBG("Creating session with ONE network URI is a bad call"); | |
4169 | ret = LTTNG_ERR_SESSION_FAIL; | |
4170 | free(uris); | |
4171 | goto error; | |
4172 | } | |
4173 | } | |
4174 | ||
4175 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
4176 | nb_uri, &cmd_ctx->creds); | |
4177 | free(uris); | |
4178 | break; | |
4179 | } | |
ecc48a90 JD |
4180 | case LTTNG_CREATE_SESSION_LIVE: |
4181 | { | |
4182 | size_t nb_uri, len; | |
4183 | struct lttng_uri *uris = NULL; | |
4184 | ||
4185 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
4186 | len = nb_uri * sizeof(struct lttng_uri); | |
4187 | ||
4188 | if (nb_uri > 0) { | |
4189 | uris = zmalloc(len); | |
4190 | if (uris == NULL) { | |
4191 | ret = LTTNG_ERR_FATAL; | |
4192 | goto error; | |
4193 | } | |
4194 | ||
4195 | /* Receive variable len data */ | |
4196 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
4197 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
4198 | if (ret <= 0) { | |
4199 | DBG("No URIs received from client... continuing"); | |
4200 | *sock_error = 1; | |
4201 | ret = LTTNG_ERR_SESSION_FAIL; | |
4202 | free(uris); | |
4203 | goto error; | |
4204 | } | |
4205 | ||
4206 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
4207 | DBG("Creating session with ONE network URI is a bad call"); | |
4208 | ret = LTTNG_ERR_SESSION_FAIL; | |
4209 | free(uris); | |
4210 | goto error; | |
4211 | } | |
4212 | } | |
4213 | ||
4214 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, | |
4215 | nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval); | |
4216 | free(uris); | |
4217 | break; | |
4218 | } | |
fb198a11 JG |
4219 | case LTTNG_SAVE_SESSION: |
4220 | { | |
4221 | ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr, | |
4222 | &cmd_ctx->creds); | |
4223 | break; | |
4224 | } | |
d7ba1388 MD |
4225 | case LTTNG_SET_SESSION_SHM_PATH: |
4226 | { | |
4227 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
4228 | cmd_ctx->lsm->u.set_shm_path.shm_path); | |
4229 | break; | |
4230 | } | |
eded6438 | 4231 | case LTTNG_REGENERATE_METADATA: |
93ec662e | 4232 | { |
eded6438 | 4233 | ret = cmd_regenerate_metadata(cmd_ctx->session); |
93ec662e JD |
4234 | break; |
4235 | } | |
c2561365 JD |
4236 | case LTTNG_REGENERATE_STATEDUMP: |
4237 | { | |
4238 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
4239 | break; | |
4240 | } | |
b3530820 JG |
4241 | case LTTNG_REGISTER_TRIGGER: |
4242 | { | |
4243 | ret = cmd_register_trigger(cmd_ctx, sock, | |
4244 | notification_thread_handle); | |
4245 | break; | |
4246 | } | |
4247 | case LTTNG_UNREGISTER_TRIGGER: | |
4248 | { | |
4249 | ret = cmd_unregister_trigger(cmd_ctx, sock, | |
4250 | notification_thread_handle); | |
4251 | break; | |
4252 | } | |
5c408ad8 JD |
4253 | case LTTNG_ROTATE_SESSION: |
4254 | { | |
4255 | struct lttng_rotate_session_return rotate_return; | |
4256 | ||
4257 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); | |
4258 | ||
d68c9a04 | 4259 | memset(&rotate_return, 0, sizeof(rotate_return)); |
5c408ad8 JD |
4260 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { |
4261 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
4262 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
4263 | goto error; | |
4264 | } | |
4265 | ||
4266 | ret = cmd_rotate_session(cmd_ctx->session, &rotate_return); | |
4267 | if (ret < 0) { | |
4268 | ret = -ret; | |
4269 | goto error; | |
4270 | } | |
4271 | ||
4272 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, | |
4273 | sizeof(rotate_return)); | |
4274 | if (ret < 0) { | |
4275 | ret = -ret; | |
4276 | goto error; | |
4277 | } | |
4278 | ||
4279 | ret = LTTNG_OK; | |
4280 | break; | |
4281 | } | |
d68c9a04 | 4282 | case LTTNG_ROTATION_GET_INFO: |
5c408ad8 | 4283 | { |
d68c9a04 | 4284 | struct lttng_rotation_get_info_return get_info_return; |
5c408ad8 | 4285 | |
d68c9a04 JD |
4286 | memset(&get_info_return, 0, sizeof(get_info_return)); |
4287 | ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return, | |
4288 | cmd_ctx->lsm->u.get_rotation_info.rotation_id); | |
5c408ad8 JD |
4289 | if (ret < 0) { |
4290 | ret = -ret; | |
4291 | goto error; | |
4292 | } | |
4293 | ||
d68c9a04 JD |
4294 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return, |
4295 | sizeof(get_info_return)); | |
5c408ad8 JD |
4296 | if (ret < 0) { |
4297 | ret = -ret; | |
4298 | goto error; | |
4299 | } | |
4300 | ||
4301 | ret = LTTNG_OK; | |
4302 | break; | |
4303 | } | |
259c2674 JD |
4304 | case LTTNG_ROTATION_SET_SCHEDULE: |
4305 | { | |
66ea93b1 JG |
4306 | bool set_schedule; |
4307 | enum lttng_rotation_schedule_type schedule_type; | |
4308 | uint64_t value; | |
4309 | ||
259c2674 JD |
4310 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { |
4311 | DBG("Kernel tracer version does not support session rotations"); | |
4312 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
4313 | goto error; | |
4314 | } | |
4315 | ||
66ea93b1 JG |
4316 | set_schedule = cmd_ctx->lsm->u.rotation_set_schedule.set == 1; |
4317 | schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm->u.rotation_set_schedule.type; | |
4318 | value = cmd_ctx->lsm->u.rotation_set_schedule.value; | |
4319 | ||
259c2674 | 4320 | ret = cmd_rotation_set_schedule(cmd_ctx->session, |
66ea93b1 JG |
4321 | set_schedule, |
4322 | schedule_type, | |
4323 | value, | |
90936dcf | 4324 | notification_thread_handle); |
a2026546 | 4325 | if (ret != LTTNG_OK) { |
259c2674 JD |
4326 | goto error; |
4327 | } | |
4328 | ||
259c2674 JD |
4329 | break; |
4330 | } | |
66ea93b1 | 4331 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
329f3443 | 4332 | { |
66ea93b1 JG |
4333 | struct lttng_session_list_schedules_return schedules = { |
4334 | .periodic.set = !!cmd_ctx->session->rotate_timer_period, | |
4335 | .periodic.value = cmd_ctx->session->rotate_timer_period, | |
4336 | .size.set = !!cmd_ctx->session->rotate_size, | |
4337 | .size.value = cmd_ctx->session->rotate_size, | |
4338 | }; | |
4339 | ||
4340 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, | |
4341 | sizeof(schedules)); | |
329f3443 JD |
4342 | if (ret < 0) { |
4343 | ret = -ret; | |
4344 | goto error; | |
4345 | } | |
4346 | ||
4347 | ret = LTTNG_OK; | |
4348 | break; | |
4349 | } | |
5e16da05 | 4350 | default: |
f73fabfd | 4351 | ret = LTTNG_ERR_UND; |
5461b305 | 4352 | break; |
fac6795d DG |
4353 | } |
4354 | ||
5461b305 | 4355 | error: |
5461b305 DG |
4356 | if (cmd_ctx->llm == NULL) { |
4357 | DBG("Missing llm structure. Allocating one."); | |
6e10c9b9 | 4358 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { |
5461b305 DG |
4359 | goto setup_error; |
4360 | } | |
4361 | } | |
54d01ffb | 4362 | /* Set return code */ |
5461b305 | 4363 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 4364 | setup_error: |
b5541356 | 4365 | if (cmd_ctx->session) { |
54d01ffb | 4366 | session_unlock(cmd_ctx->session); |
b5541356 | 4367 | } |
256a5576 MD |
4368 | if (need_tracing_session) { |
4369 | session_unlock_list(); | |
4370 | } | |
54d01ffb | 4371 | init_setup_error: |
3745d315 | 4372 | assert(!rcu_read_ongoing()); |
8028d920 | 4373 | return ret; |
fac6795d DG |
4374 | } |
4375 | ||
44a5e5eb DG |
4376 | /* |
4377 | * Thread managing health check socket. | |
4378 | */ | |
4379 | static void *thread_manage_health(void *data) | |
4380 | { | |
eb4a2943 | 4381 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
4382 | uint32_t revents, nb_fd; |
4383 | struct lttng_poll_event events; | |
0c89d795 MD |
4384 | struct health_comm_msg msg; |
4385 | struct health_comm_reply reply; | |
44a5e5eb DG |
4386 | |
4387 | DBG("[thread] Manage health check started"); | |
4388 | ||
4389 | rcu_register_thread(); | |
4390 | ||
6d737ce4 DG |
4391 | /* We might hit an error path before this is created. */ |
4392 | lttng_poll_init(&events); | |
3cc04881 | 4393 | |
44a5e5eb | 4394 | /* Create unix socket */ |
e6142f2e | 4395 | sock = lttcomm_create_unix_sock(config.health_unix_sock_path.value); |
44a5e5eb DG |
4396 | if (sock < 0) { |
4397 | ERR("Unable to create health check Unix socket"); | |
44a5e5eb DG |
4398 | goto error; |
4399 | } | |
4400 | ||
6c71277b MD |
4401 | if (is_root) { |
4402 | /* lttng health client socket path permissions */ | |
e6142f2e JG |
4403 | ret = chown(config.health_unix_sock_path.value, 0, |
4404 | utils_get_group_id(config.tracing_group_name.value)); | |
6c71277b | 4405 | if (ret < 0) { |
e6142f2e | 4406 | ERR("Unable to set group on %s", config.health_unix_sock_path.value); |
6c71277b | 4407 | PERROR("chown"); |
6c71277b MD |
4408 | goto error; |
4409 | } | |
4410 | ||
e6142f2e | 4411 | ret = chmod(config.health_unix_sock_path.value, |
6c71277b MD |
4412 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
4413 | if (ret < 0) { | |
e6142f2e | 4414 | ERR("Unable to set permissions on %s", config.health_unix_sock_path.value); |
6c71277b | 4415 | PERROR("chmod"); |
6c71277b MD |
4416 | goto error; |
4417 | } | |
4418 | } | |
4419 | ||
b662582b DG |
4420 | /* |
4421 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4422 | * show must go on. | |
4423 | */ | |
4424 | (void) utils_set_fd_cloexec(sock); | |
4425 | ||
44a5e5eb DG |
4426 | ret = lttcomm_listen_unix_sock(sock); |
4427 | if (ret < 0) { | |
4428 | goto error; | |
4429 | } | |
4430 | ||
4431 | /* | |
4432 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4433 | * more will be added to this poll set. | |
4434 | */ | |
d0b96690 | 4435 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
4436 | if (ret < 0) { |
4437 | goto error; | |
4438 | } | |
4439 | ||
4440 | /* Add the application registration socket */ | |
4441 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
4442 | if (ret < 0) { | |
4443 | goto error; | |
4444 | } | |
4445 | ||
ef367a93 | 4446 | sessiond_notify_ready(); |
97bc1426 | 4447 | |
44a5e5eb DG |
4448 | while (1) { |
4449 | DBG("Health check ready"); | |
4450 | ||
44a5e5eb DG |
4451 | /* Inifinite blocking call, waiting for transmission */ |
4452 | restart: | |
4453 | ret = lttng_poll_wait(&events, -1); | |
4454 | if (ret < 0) { | |
4455 | /* | |
4456 | * Restart interrupted system call. | |
4457 | */ | |
4458 | if (errno == EINTR) { | |
4459 | goto restart; | |
4460 | } | |
4461 | goto error; | |
4462 | } | |
4463 | ||
0d9c5d77 DG |
4464 | nb_fd = ret; |
4465 | ||
44a5e5eb DG |
4466 | for (i = 0; i < nb_fd; i++) { |
4467 | /* Fetch once the poll data */ | |
4468 | revents = LTTNG_POLL_GETEV(&events, i); | |
4469 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4470 | ||
fd20dac9 MD |
4471 | if (!revents) { |
4472 | /* No activity for this FD (poll implementation). */ | |
4473 | continue; | |
4474 | } | |
4475 | ||
44a5e5eb | 4476 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4477 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 4478 | if (ret) { |
139ac872 MD |
4479 | err = 0; |
4480 | goto exit; | |
44a5e5eb DG |
4481 | } |
4482 | ||
4483 | /* Event on the registration socket */ | |
4484 | if (pollfd == sock) { | |
03e43155 MD |
4485 | if (revents & LPOLLIN) { |
4486 | continue; | |
4487 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
44a5e5eb DG |
4488 | ERR("Health socket poll error"); |
4489 | goto error; | |
03e43155 MD |
4490 | } else { |
4491 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
4492 | goto error; | |
44a5e5eb DG |
4493 | } |
4494 | } | |
4495 | } | |
4496 | ||
4497 | new_sock = lttcomm_accept_unix_sock(sock); | |
4498 | if (new_sock < 0) { | |
4499 | goto error; | |
4500 | } | |
4501 | ||
b662582b DG |
4502 | /* |
4503 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4504 | * show must go on. | |
4505 | */ | |
4506 | (void) utils_set_fd_cloexec(new_sock); | |
4507 | ||
44a5e5eb DG |
4508 | DBG("Receiving data from client for health..."); |
4509 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
4510 | if (ret <= 0) { | |
4511 | DBG("Nothing recv() from client... continuing"); | |
4512 | ret = close(new_sock); | |
4513 | if (ret) { | |
4514 | PERROR("close"); | |
4515 | } | |
44a5e5eb DG |
4516 | continue; |
4517 | } | |
4518 | ||
4519 | rcu_thread_online(); | |
4520 | ||
53efb85a | 4521 | memset(&reply, 0, sizeof(reply)); |
6c71277b MD |
4522 | for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) { |
4523 | /* | |
4524 | * health_check_state returns 0 if health is | |
4525 | * bad. | |
4526 | */ | |
4527 | if (!health_check_state(health_sessiond, i)) { | |
4528 | reply.ret_code |= 1ULL << i; | |
4529 | } | |
44a5e5eb DG |
4530 | } |
4531 | ||
6c71277b | 4532 | DBG2("Health check return value %" PRIx64, reply.ret_code); |
44a5e5eb DG |
4533 | |
4534 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
4535 | if (ret < 0) { | |
4536 | ERR("Failed to send health data back to client"); | |
4537 | } | |
4538 | ||
4539 | /* End of transmission */ | |
4540 | ret = close(new_sock); | |
4541 | if (ret) { | |
4542 | PERROR("close"); | |
4543 | } | |
44a5e5eb DG |
4544 | } |
4545 | ||
139ac872 | 4546 | exit: |
44a5e5eb | 4547 | error: |
139ac872 MD |
4548 | if (err) { |
4549 | ERR("Health error occurred in %s", __func__); | |
4550 | } | |
44a5e5eb | 4551 | DBG("Health check thread dying"); |
e6142f2e | 4552 | unlink(config.health_unix_sock_path.value); |
44a5e5eb DG |
4553 | if (sock >= 0) { |
4554 | ret = close(sock); | |
4555 | if (ret) { | |
4556 | PERROR("close"); | |
4557 | } | |
4558 | } | |
44a5e5eb DG |
4559 | |
4560 | lttng_poll_clean(&events); | |
b11d6a7f | 4561 | stop_threads(); |
44a5e5eb DG |
4562 | rcu_unregister_thread(); |
4563 | return NULL; | |
4564 | } | |
4565 | ||
1d4b027a | 4566 | /* |
d063d709 DG |
4567 | * This thread manage all clients request using the unix client socket for |
4568 | * communication. | |
1d4b027a DG |
4569 | */ |
4570 | static void *thread_manage_clients(void *data) | |
4571 | { | |
139ac872 | 4572 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 4573 | int sock_error; |
5eb91c98 | 4574 | uint32_t revents, nb_fd; |
273ea72c | 4575 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 4576 | struct lttng_poll_event events; |
1d4b027a DG |
4577 | |
4578 | DBG("[thread] Manage client started"); | |
4579 | ||
f6a9efaa DG |
4580 | rcu_register_thread(); |
4581 | ||
6c71277b | 4582 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
927ca06a | 4583 | |
840cb59c | 4584 | health_code_update(); |
44a5e5eb | 4585 | |
1d4b027a DG |
4586 | ret = lttcomm_listen_unix_sock(client_sock); |
4587 | if (ret < 0) { | |
35df2755 | 4588 | goto error_listen; |
1d4b027a DG |
4589 | } |
4590 | ||
5eb91c98 DG |
4591 | /* |
4592 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4593 | * more will be added to this poll set. | |
4594 | */ | |
d0b96690 | 4595 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 4596 | if (ret < 0) { |
35df2755 | 4597 | goto error_create_poll; |
5eb91c98 | 4598 | } |
273ea72c | 4599 | |
5eb91c98 DG |
4600 | /* Add the application registration socket */ |
4601 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
4602 | if (ret < 0) { | |
4603 | goto error; | |
4604 | } | |
273ea72c | 4605 | |
ef367a93 JG |
4606 | ret = sem_post(&load_info->message_thread_ready); |
4607 | if (ret) { | |
4608 | PERROR("sem_post message_thread_ready"); | |
4609 | goto error; | |
4610 | } | |
0bb7724a | 4611 | |
f28f9e44 JG |
4612 | /* |
4613 | * Wait until all support threads are initialized before accepting | |
4614 | * commands. | |
4615 | */ | |
4616 | while (uatomic_read(<tng_sessiond_ready) != 0) { | |
4617 | fd_set read_fds; | |
4618 | struct timeval timeout; | |
4619 | ||
4620 | FD_ZERO(&read_fds); | |
4621 | FD_SET(thread_quit_pipe[0], &read_fds); | |
4622 | memset(&timeout, 0, sizeof(timeout)); | |
4623 | timeout.tv_usec = 1000; | |
4624 | ||
4625 | /* | |
4626 | * If a support thread failed to launch, it may signal that | |
4627 | * we must exit and the sessiond would never be marked as | |
4628 | * "ready". | |
4629 | * | |
4630 | * The timeout is set to 1ms, which serves as a way to | |
4631 | * pace down this check. | |
4632 | */ | |
4633 | ret = select(thread_quit_pipe[0] + 1, &read_fds, NULL, NULL, | |
4634 | &timeout); | |
4635 | if (ret > 0 || (ret < 0 && errno != EINTR)) { | |
4636 | goto exit; | |
4637 | } | |
4638 | } | |
8b0d4636 JG |
4639 | /* |
4640 | * This barrier is paired with the one in sessiond_notify_ready() to | |
4641 | * ensure that loads accessing data initialized by the other threads, | |
4642 | * on which this thread was waiting, are not performed before this point. | |
4643 | * | |
4644 | * Note that this could be a 'read' memory barrier, but a full barrier | |
4645 | * is used in case the code changes. The performance implications of | |
4646 | * this choice are minimal since this is a slow path. | |
4647 | */ | |
4648 | cmm_smp_mb(); | |
f28f9e44 | 4649 | |
72453c8c MD |
4650 | /* This testpoint is after we signal readiness to the parent. */ |
4651 | if (testpoint(sessiond_thread_manage_clients)) { | |
4652 | goto error; | |
4653 | } | |
4654 | ||
e547b070 | 4655 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { |
6993eeb3 CB |
4656 | goto error; |
4657 | } | |
8ac94142 | 4658 | |
840cb59c | 4659 | health_code_update(); |
44a5e5eb | 4660 | |
1d4b027a | 4661 | while (1) { |
a503e1ef JG |
4662 | const struct cmd_completion_handler *cmd_completion_handler; |
4663 | ||
1d4b027a | 4664 | DBG("Accepting client command ..."); |
273ea72c DG |
4665 | |
4666 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 4667 | restart: |
a78af745 | 4668 | health_poll_entry(); |
5eb91c98 | 4669 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 4670 | health_poll_exit(); |
273ea72c | 4671 | if (ret < 0) { |
88f2b785 MD |
4672 | /* |
4673 | * Restart interrupted system call. | |
4674 | */ | |
4675 | if (errno == EINTR) { | |
4676 | goto restart; | |
4677 | } | |
273ea72c DG |
4678 | goto error; |
4679 | } | |
4680 | ||
0d9c5d77 DG |
4681 | nb_fd = ret; |
4682 | ||
5eb91c98 DG |
4683 | for (i = 0; i < nb_fd; i++) { |
4684 | /* Fetch once the poll data */ | |
4685 | revents = LTTNG_POLL_GETEV(&events, i); | |
4686 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4687 | ||
840cb59c | 4688 | health_code_update(); |
44a5e5eb | 4689 | |
fd20dac9 MD |
4690 | if (!revents) { |
4691 | /* No activity for this FD (poll implementation). */ | |
4692 | continue; | |
4693 | } | |
4694 | ||
5eb91c98 | 4695 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4696 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 4697 | if (ret) { |
139ac872 MD |
4698 | err = 0; |
4699 | goto exit; | |
5eb91c98 DG |
4700 | } |
4701 | ||
4702 | /* Event on the registration socket */ | |
4703 | if (pollfd == client_sock) { | |
03e43155 MD |
4704 | if (revents & LPOLLIN) { |
4705 | continue; | |
4706 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
5eb91c98 DG |
4707 | ERR("Client socket poll error"); |
4708 | goto error; | |
03e43155 MD |
4709 | } else { |
4710 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
4711 | goto error; | |
5eb91c98 DG |
4712 | } |
4713 | } | |
4714 | } | |
4715 | ||
4716 | DBG("Wait for client response"); | |
4717 | ||
840cb59c | 4718 | health_code_update(); |
44a5e5eb | 4719 | |
5eb91c98 DG |
4720 | sock = lttcomm_accept_unix_sock(client_sock); |
4721 | if (sock < 0) { | |
273ea72c | 4722 | goto error; |
273ea72c DG |
4723 | } |
4724 | ||
b662582b DG |
4725 | /* |
4726 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4727 | * show must go on. | |
4728 | */ | |
4729 | (void) utils_set_fd_cloexec(sock); | |
4730 | ||
be040666 DG |
4731 | /* Set socket option for credentials retrieval */ |
4732 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
4733 | if (ret < 0) { | |
4734 | goto error; | |
4735 | } | |
4736 | ||
5eb91c98 | 4737 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 4738 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 4739 | if (cmd_ctx == NULL) { |
76d7553f | 4740 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 4741 | goto error; |
5eb91c98 | 4742 | } |
1d4b027a | 4743 | |
5eb91c98 | 4744 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 4745 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 4746 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 4747 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
4748 | goto error; |
4749 | } | |
1d4b027a | 4750 | |
5eb91c98 DG |
4751 | cmd_ctx->llm = NULL; |
4752 | cmd_ctx->session = NULL; | |
1d4b027a | 4753 | |
840cb59c | 4754 | health_code_update(); |
44a5e5eb | 4755 | |
5eb91c98 DG |
4756 | /* |
4757 | * Data is received from the lttng client. The struct | |
4758 | * lttcomm_session_msg (lsm) contains the command and data request of | |
4759 | * the client. | |
4760 | */ | |
4761 | DBG("Receiving data from client ..."); | |
be040666 DG |
4762 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
4763 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
4764 | if (ret <= 0) { |
4765 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
4766 | ret = close(sock); |
4767 | if (ret) { | |
4768 | PERROR("close"); | |
4769 | } | |
4770 | sock = -1; | |
a2c0da86 | 4771 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4772 | continue; |
4773 | } | |
1d4b027a | 4774 | |
840cb59c | 4775 | health_code_update(); |
44a5e5eb | 4776 | |
5eb91c98 DG |
4777 | // TODO: Validate cmd_ctx including sanity check for |
4778 | // security purpose. | |
f7776ea7 | 4779 | |
f6a9efaa | 4780 | rcu_thread_online(); |
5eb91c98 DG |
4781 | /* |
4782 | * This function dispatch the work to the kernel or userspace tracer | |
4783 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
4784 | * informations for the client. The command context struct contains | |
4785 | * everything this function may needs. | |
4786 | */ | |
53a80697 | 4787 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 4788 | rcu_thread_offline(); |
5eb91c98 | 4789 | if (ret < 0) { |
36134aa1 DG |
4790 | ret = close(sock); |
4791 | if (ret) { | |
4792 | PERROR("close"); | |
53a80697 | 4793 | } |
36134aa1 | 4794 | sock = -1; |
bbd973c2 | 4795 | /* |
5eb91c98 | 4796 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 4797 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
4798 | * (ENOMEM). Error detected but still accept |
4799 | * command, unless a socket error has been | |
4800 | * detected. | |
bbd973c2 | 4801 | */ |
bbd973c2 | 4802 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4803 | continue; |
4804 | } | |
d6e4fca4 | 4805 | |
a503e1ef JG |
4806 | cmd_completion_handler = cmd_pop_completion_handler(); |
4807 | if (cmd_completion_handler) { | |
4808 | enum lttng_error_code completion_code; | |
4809 | ||
4810 | completion_code = cmd_completion_handler->run( | |
4811 | cmd_completion_handler->data); | |
4812 | if (completion_code != LTTNG_OK) { | |
4813 | clean_command_ctx(&cmd_ctx); | |
4814 | continue; | |
4815 | } | |
4816 | } | |
4817 | ||
840cb59c | 4818 | health_code_update(); |
44a5e5eb | 4819 | |
a1ac8b97 | 4820 | DBG("Sending response (size: %d, retcode: %s (%d))", |
54d01ffb | 4821 | cmd_ctx->lttng_msg_size, |
a1ac8b97 JG |
4822 | lttng_strerror(-cmd_ctx->llm->ret_code), |
4823 | cmd_ctx->llm->ret_code); | |
54d01ffb | 4824 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
4825 | if (ret < 0) { |
4826 | ERR("Failed to send data back to client"); | |
bbd973c2 | 4827 | } |
1d4b027a | 4828 | |
5eb91c98 | 4829 | /* End of transmission */ |
76d7553f MD |
4830 | ret = close(sock); |
4831 | if (ret) { | |
4832 | PERROR("close"); | |
4833 | } | |
4834 | sock = -1; | |
be040666 DG |
4835 | |
4836 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 4837 | |
840cb59c | 4838 | health_code_update(); |
273ea72c DG |
4839 | } |
4840 | ||
139ac872 | 4841 | exit: |
5eb91c98 | 4842 | error: |
35df2755 CB |
4843 | if (sock >= 0) { |
4844 | ret = close(sock); | |
4845 | if (ret) { | |
4846 | PERROR("close"); | |
4847 | } | |
139ac872 | 4848 | } |
44a5e5eb | 4849 | |
35df2755 CB |
4850 | lttng_poll_clean(&events); |
4851 | clean_command_ctx(&cmd_ctx); | |
4852 | ||
4853 | error_listen: | |
4854 | error_create_poll: | |
e6142f2e | 4855 | unlink(config.client_unix_sock_path.value); |
76d7553f MD |
4856 | if (client_sock >= 0) { |
4857 | ret = close(client_sock); | |
4858 | if (ret) { | |
4859 | PERROR("close"); | |
4860 | } | |
a4b35e07 | 4861 | } |
35df2755 CB |
4862 | |
4863 | if (err) { | |
840cb59c | 4864 | health_error(); |
35df2755 | 4865 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 4866 | } |
273ea72c | 4867 | |
8782cc74 | 4868 | health_unregister(health_sessiond); |
35df2755 CB |
4869 | |
4870 | DBG("Client thread dying"); | |
f6a9efaa DG |
4871 | |
4872 | rcu_unregister_thread(); | |
4a15001e MD |
4873 | |
4874 | /* | |
4875 | * Since we are creating the consumer threads, we own them, so we need | |
4876 | * to join them before our thread exits. | |
4877 | */ | |
4878 | ret = join_consumer_thread(&kconsumer_data); | |
4879 | if (ret) { | |
4880 | errno = ret; | |
4881 | PERROR("join_consumer"); | |
4882 | } | |
4883 | ||
4884 | ret = join_consumer_thread(&ustconsumer32_data); | |
4885 | if (ret) { | |
4886 | errno = ret; | |
4887 | PERROR("join_consumer ust32"); | |
4888 | } | |
4889 | ||
4890 | ret = join_consumer_thread(&ustconsumer64_data); | |
4891 | if (ret) { | |
4892 | errno = ret; | |
4893 | PERROR("join_consumer ust64"); | |
4894 | } | |
1d4b027a DG |
4895 | return NULL; |
4896 | } | |
4897 | ||
c0232ea5 JG |
4898 | static int string_match(const char *str1, const char *str2) |
4899 | { | |
4900 | return (str1 && str2) && !strcmp(str1, str2); | |
4901 | } | |
4902 | ||
fac6795d | 4903 | /* |
26296c48 JG |
4904 | * Take an option from the getopt output and set it in the right variable to be |
4905 | * used later. | |
4906 | * | |
4907 | * Return 0 on success else a negative value. | |
fac6795d | 4908 | */ |
26296c48 | 4909 | static int set_option(int opt, const char *arg, const char *optname) |
fac6795d | 4910 | { |
26296c48 | 4911 | int ret = 0; |
fac6795d | 4912 | |
c0232ea5 | 4913 | if (string_match(optname, "client-sock") || opt == 'c') { |
66b2ce8e JG |
4914 | if (!arg || *arg == '\0') { |
4915 | ret = -EINVAL; | |
4916 | goto end; | |
4917 | } | |
e8fa9fb0 MD |
4918 | if (lttng_is_setuid_setgid()) { |
4919 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4920 | "-c, --client-sock"); | |
4921 | } else { | |
e6142f2e JG |
4922 | config_string_set(&config.client_unix_sock_path, |
4923 | strdup(arg)); | |
4924 | if (!config.client_unix_sock_path.value) { | |
4925 | ret = -ENOMEM; | |
4926 | PERROR("strdup"); | |
4927 | } | |
e8fa9fb0 | 4928 | } |
c0232ea5 | 4929 | } else if (string_match(optname, "apps-sock") || opt == 'a') { |
66b2ce8e JG |
4930 | if (!arg || *arg == '\0') { |
4931 | ret = -EINVAL; | |
4932 | goto end; | |
4933 | } | |
e8fa9fb0 MD |
4934 | if (lttng_is_setuid_setgid()) { |
4935 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4936 | "-a, --apps-sock"); | |
4937 | } else { | |
e6142f2e JG |
4938 | config_string_set(&config.apps_unix_sock_path, |
4939 | strdup(arg)); | |
4940 | if (!config.apps_unix_sock_path.value) { | |
4941 | ret = -ENOMEM; | |
4942 | PERROR("strdup"); | |
4943 | } | |
e8fa9fb0 | 4944 | } |
c0232ea5 | 4945 | } else if (string_match(optname, "daemonize") || opt == 'd') { |
e6142f2e | 4946 | config.daemonize = true; |
c0232ea5 | 4947 | } else if (string_match(optname, "background") || opt == 'b') { |
e6142f2e | 4948 | config.background = true; |
c0232ea5 | 4949 | } else if (string_match(optname, "group") || opt == 'g') { |
66b2ce8e JG |
4950 | if (!arg || *arg == '\0') { |
4951 | ret = -EINVAL; | |
4952 | goto end; | |
4953 | } | |
e8fa9fb0 MD |
4954 | if (lttng_is_setuid_setgid()) { |
4955 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4956 | "-g, --group"); | |
4957 | } else { | |
e6142f2e JG |
4958 | config_string_set(&config.tracing_group_name, |
4959 | strdup(arg)); | |
4960 | if (!config.tracing_group_name.value) { | |
e8fa9fb0 | 4961 | ret = -ENOMEM; |
e6142f2e | 4962 | PERROR("strdup"); |
e8fa9fb0 | 4963 | } |
db322c4d | 4964 | } |
c0232ea5 | 4965 | } else if (string_match(optname, "help") || opt == 'h') { |
4fc83d94 | 4966 | ret = utils_show_help(8, "lttng-sessiond", help_msg); |
8190767e | 4967 | if (ret) { |
4fc83d94 | 4968 | ERR("Cannot show --help for `lttng-sessiond`"); |
8190767e PP |
4969 | perror("exec"); |
4970 | } | |
4971 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); | |
c0232ea5 | 4972 | } else if (string_match(optname, "version") || opt == 'V') { |
26296c48 JG |
4973 | fprintf(stdout, "%s\n", VERSION); |
4974 | exit(EXIT_SUCCESS); | |
c0232ea5 | 4975 | } else if (string_match(optname, "sig-parent") || opt == 'S') { |
e6142f2e | 4976 | config.sig_parent = true; |
c0232ea5 | 4977 | } else if (string_match(optname, "kconsumerd-err-sock")) { |
66b2ce8e JG |
4978 | if (!arg || *arg == '\0') { |
4979 | ret = -EINVAL; | |
4980 | goto end; | |
4981 | } | |
e8fa9fb0 MD |
4982 | if (lttng_is_setuid_setgid()) { |
4983 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4984 | "--kconsumerd-err-sock"); | |
4985 | } else { | |
e6142f2e JG |
4986 | config_string_set(&config.kconsumerd_err_unix_sock_path, |
4987 | strdup(arg)); | |
4988 | if (!config.kconsumerd_err_unix_sock_path.value) { | |
4989 | ret = -ENOMEM; | |
4990 | PERROR("strdup"); | |
4991 | } | |
e8fa9fb0 | 4992 | } |
c0232ea5 | 4993 | } else if (string_match(optname, "kconsumerd-cmd-sock")) { |
66b2ce8e JG |
4994 | if (!arg || *arg == '\0') { |
4995 | ret = -EINVAL; | |
4996 | goto end; | |
4997 | } | |
e8fa9fb0 MD |
4998 | if (lttng_is_setuid_setgid()) { |
4999 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5000 | "--kconsumerd-cmd-sock"); | |
5001 | } else { | |
e6142f2e JG |
5002 | config_string_set(&config.kconsumerd_cmd_unix_sock_path, |
5003 | strdup(arg)); | |
5004 | if (!config.kconsumerd_cmd_unix_sock_path.value) { | |
5005 | ret = -ENOMEM; | |
5006 | PERROR("strdup"); | |
5007 | } | |
e8fa9fb0 | 5008 | } |
c0232ea5 | 5009 | } else if (string_match(optname, "ustconsumerd64-err-sock")) { |
66b2ce8e JG |
5010 | if (!arg || *arg == '\0') { |
5011 | ret = -EINVAL; | |
5012 | goto end; | |
5013 | } | |
e8fa9fb0 MD |
5014 | if (lttng_is_setuid_setgid()) { |
5015 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5016 | "--ustconsumerd64-err-sock"); | |
5017 | } else { | |
e6142f2e JG |
5018 | config_string_set(&config.consumerd64_err_unix_sock_path, |
5019 | strdup(arg)); | |
5020 | if (!config.consumerd64_err_unix_sock_path.value) { | |
5021 | ret = -ENOMEM; | |
5022 | PERROR("strdup"); | |
5023 | } | |
e8fa9fb0 | 5024 | } |
c0232ea5 | 5025 | } else if (string_match(optname, "ustconsumerd64-cmd-sock")) { |
66b2ce8e JG |
5026 | if (!arg || *arg == '\0') { |
5027 | ret = -EINVAL; | |
5028 | goto end; | |
5029 | } | |
e8fa9fb0 MD |
5030 | if (lttng_is_setuid_setgid()) { |
5031 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5032 | "--ustconsumerd64-cmd-sock"); | |
5033 | } else { | |
e6142f2e JG |
5034 | config_string_set(&config.consumerd64_cmd_unix_sock_path, |
5035 | strdup(arg)); | |
5036 | if (!config.consumerd64_cmd_unix_sock_path.value) { | |
5037 | ret = -ENOMEM; | |
5038 | PERROR("strdup"); | |
5039 | } | |
e8fa9fb0 | 5040 | } |
c0232ea5 | 5041 | } else if (string_match(optname, "ustconsumerd32-err-sock")) { |
66b2ce8e JG |
5042 | if (!arg || *arg == '\0') { |
5043 | ret = -EINVAL; | |
5044 | goto end; | |
5045 | } | |
e8fa9fb0 MD |
5046 | if (lttng_is_setuid_setgid()) { |
5047 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5048 | "--ustconsumerd32-err-sock"); | |
5049 | } else { | |
e6142f2e JG |
5050 | config_string_set(&config.consumerd32_err_unix_sock_path, |
5051 | strdup(arg)); | |
5052 | if (!config.consumerd32_err_unix_sock_path.value) { | |
5053 | ret = -ENOMEM; | |
5054 | PERROR("strdup"); | |
5055 | } | |
e8fa9fb0 | 5056 | } |
c0232ea5 | 5057 | } else if (string_match(optname, "ustconsumerd32-cmd-sock")) { |
66b2ce8e JG |
5058 | if (!arg || *arg == '\0') { |
5059 | ret = -EINVAL; | |
5060 | goto end; | |
5061 | } | |
e8fa9fb0 MD |
5062 | if (lttng_is_setuid_setgid()) { |
5063 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5064 | "--ustconsumerd32-cmd-sock"); | |
5065 | } else { | |
e6142f2e JG |
5066 | config_string_set(&config.consumerd32_cmd_unix_sock_path, |
5067 | strdup(arg)); | |
5068 | if (!config.consumerd32_cmd_unix_sock_path.value) { | |
5069 | ret = -ENOMEM; | |
5070 | PERROR("strdup"); | |
5071 | } | |
e8fa9fb0 | 5072 | } |
c0232ea5 | 5073 | } else if (string_match(optname, "no-kernel")) { |
e6142f2e | 5074 | config.no_kernel = true; |
c0232ea5 | 5075 | } else if (string_match(optname, "quiet") || opt == 'q') { |
6d9a9c65 | 5076 | config.quiet = true; |
c0232ea5 | 5077 | } else if (string_match(optname, "verbose") || opt == 'v') { |
26296c48 JG |
5078 | /* Verbose level can increase using multiple -v */ |
5079 | if (arg) { | |
13755a18 | 5080 | /* Value obtained from config file */ |
e6142f2e | 5081 | config.verbose = config_parse_value(arg); |
26296c48 | 5082 | } else { |
13755a18 | 5083 | /* -v used on command line */ |
e6142f2e | 5084 | config.verbose++; |
26296c48 | 5085 | } |
13755a18 | 5086 | /* Clamp value to [0, 3] */ |
e6142f2e JG |
5087 | config.verbose = config.verbose < 0 ? 0 : |
5088 | (config.verbose <= 3 ? config.verbose : 3); | |
c0232ea5 | 5089 | } else if (string_match(optname, "verbose-consumer")) { |
26296c48 | 5090 | if (arg) { |
e6142f2e | 5091 | config.verbose_consumer = config_parse_value(arg); |
26296c48 | 5092 | } else { |
e6142f2e | 5093 | config.verbose_consumer++; |
26296c48 | 5094 | } |
c0232ea5 | 5095 | } else if (string_match(optname, "consumerd32-path")) { |
66b2ce8e JG |
5096 | if (!arg || *arg == '\0') { |
5097 | ret = -EINVAL; | |
5098 | goto end; | |
5099 | } | |
e8fa9fb0 MD |
5100 | if (lttng_is_setuid_setgid()) { |
5101 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5102 | "--consumerd32-path"); | |
5103 | } else { | |
e6142f2e JG |
5104 | config_string_set(&config.consumerd32_bin_path, |
5105 | strdup(arg)); | |
5106 | if (!config.consumerd32_bin_path.value) { | |
e8fa9fb0 MD |
5107 | PERROR("strdup"); |
5108 | ret = -ENOMEM; | |
5109 | } | |
db322c4d | 5110 | } |
c0232ea5 | 5111 | } else if (string_match(optname, "consumerd32-libdir")) { |
66b2ce8e JG |
5112 | if (!arg || *arg == '\0') { |
5113 | ret = -EINVAL; | |
5114 | goto end; | |
5115 | } | |
e8fa9fb0 MD |
5116 | if (lttng_is_setuid_setgid()) { |
5117 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5118 | "--consumerd32-libdir"); | |
5119 | } else { | |
e6142f2e JG |
5120 | config_string_set(&config.consumerd32_lib_dir, |
5121 | strdup(arg)); | |
5122 | if (!config.consumerd32_lib_dir.value) { | |
e8fa9fb0 MD |
5123 | PERROR("strdup"); |
5124 | ret = -ENOMEM; | |
5125 | } | |
db322c4d | 5126 | } |
c0232ea5 | 5127 | } else if (string_match(optname, "consumerd64-path")) { |
66b2ce8e JG |
5128 | if (!arg || *arg == '\0') { |
5129 | ret = -EINVAL; | |
5130 | goto end; | |
5131 | } | |
e8fa9fb0 MD |
5132 | if (lttng_is_setuid_setgid()) { |
5133 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5134 | "--consumerd64-path"); | |
5135 | } else { | |
e6142f2e JG |
5136 | config_string_set(&config.consumerd64_bin_path, |
5137 | strdup(arg)); | |
5138 | if (!config.consumerd64_bin_path.value) { | |
e8fa9fb0 MD |
5139 | PERROR("strdup"); |
5140 | ret = -ENOMEM; | |
5141 | } | |
db322c4d | 5142 | } |
c0232ea5 | 5143 | } else if (string_match(optname, "consumerd64-libdir")) { |
66b2ce8e JG |
5144 | if (!arg || *arg == '\0') { |
5145 | ret = -EINVAL; | |
5146 | goto end; | |
5147 | } | |
e8fa9fb0 MD |
5148 | if (lttng_is_setuid_setgid()) { |
5149 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5150 | "--consumerd64-libdir"); | |
5151 | } else { | |
e6142f2e JG |
5152 | config_string_set(&config.consumerd64_lib_dir, |
5153 | strdup(arg)); | |
5154 | if (!config.consumerd64_lib_dir.value) { | |
e8fa9fb0 MD |
5155 | PERROR("strdup"); |
5156 | ret = -ENOMEM; | |
5157 | } | |
db322c4d | 5158 | } |
c0232ea5 | 5159 | } else if (string_match(optname, "pidfile") || opt == 'p') { |
66b2ce8e JG |
5160 | if (!arg || *arg == '\0') { |
5161 | ret = -EINVAL; | |
5162 | goto end; | |
5163 | } | |
e8fa9fb0 MD |
5164 | if (lttng_is_setuid_setgid()) { |
5165 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5166 | "-p, --pidfile"); | |
5167 | } else { | |
e6142f2e JG |
5168 | config_string_set(&config.pid_file_path, strdup(arg)); |
5169 | if (!config.pid_file_path.value) { | |
e8fa9fb0 MD |
5170 | PERROR("strdup"); |
5171 | ret = -ENOMEM; | |
5172 | } | |
db322c4d | 5173 | } |
c0232ea5 | 5174 | } else if (string_match(optname, "agent-tcp-port")) { |
66b2ce8e JG |
5175 | if (!arg || *arg == '\0') { |
5176 | ret = -EINVAL; | |
5177 | goto end; | |
5178 | } | |
e8fa9fb0 MD |
5179 | if (lttng_is_setuid_setgid()) { |
5180 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5181 | "--agent-tcp-port"); | |
5182 | } else { | |
5183 | unsigned long v; | |
4d076222 | 5184 | |
e8fa9fb0 MD |
5185 | errno = 0; |
5186 | v = strtoul(arg, NULL, 0); | |
5187 | if (errno != 0 || !isdigit(arg[0])) { | |
5188 | ERR("Wrong value in --agent-tcp-port parameter: %s", arg); | |
5189 | return -1; | |
5190 | } | |
5191 | if (v == 0 || v >= 65535) { | |
5192 | ERR("Port overflow in --agent-tcp-port parameter: %s", arg); | |
5193 | return -1; | |
5194 | } | |
2288467f JG |
5195 | config.agent_tcp_port.begin = config.agent_tcp_port.end = (int) v; |
5196 | DBG3("Agent TCP port set to non default: %i", (int) v); | |
26296c48 | 5197 | } |
c0232ea5 | 5198 | } else if (string_match(optname, "load") || opt == 'l') { |
66b2ce8e JG |
5199 | if (!arg || *arg == '\0') { |
5200 | ret = -EINVAL; | |
5201 | goto end; | |
5202 | } | |
e8fa9fb0 MD |
5203 | if (lttng_is_setuid_setgid()) { |
5204 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5205 | "-l, --load"); | |
5206 | } else { | |
e6142f2e JG |
5207 | config_string_set(&config.load_session_path, strdup(arg)); |
5208 | if (!config.load_session_path.value) { | |
e8fa9fb0 MD |
5209 | PERROR("strdup"); |
5210 | ret = -ENOMEM; | |
5211 | } | |
ef367a93 | 5212 | } |
c0232ea5 | 5213 | } else if (string_match(optname, "kmod-probes")) { |
66b2ce8e JG |
5214 | if (!arg || *arg == '\0') { |
5215 | ret = -EINVAL; | |
5216 | goto end; | |
5217 | } | |
e8fa9fb0 MD |
5218 | if (lttng_is_setuid_setgid()) { |
5219 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5220 | "--kmod-probes"); | |
5221 | } else { | |
e6142f2e JG |
5222 | config_string_set(&config.kmod_probes_list, strdup(arg)); |
5223 | if (!config.kmod_probes_list.value) { | |
e8fa9fb0 MD |
5224 | PERROR("strdup"); |
5225 | ret = -ENOMEM; | |
5226 | } | |
c9d42407 | 5227 | } |
c0232ea5 | 5228 | } else if (string_match(optname, "extra-kmod-probes")) { |
66b2ce8e JG |
5229 | if (!arg || *arg == '\0') { |
5230 | ret = -EINVAL; | |
5231 | goto end; | |
5232 | } | |
e8fa9fb0 MD |
5233 | if (lttng_is_setuid_setgid()) { |
5234 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5235 | "--extra-kmod-probes"); | |
5236 | } else { | |
e6142f2e JG |
5237 | config_string_set(&config.kmod_extra_probes_list, |
5238 | strdup(arg)); | |
5239 | if (!config.kmod_extra_probes_list.value) { | |
e8fa9fb0 MD |
5240 | PERROR("strdup"); |
5241 | ret = -ENOMEM; | |
5242 | } | |
db322c4d | 5243 | } |
c0232ea5 JG |
5244 | } else if (string_match(optname, "config") || opt == 'f') { |
5245 | /* This is handled in set_options() thus silent skip. */ | |
5246 | goto end; | |
5247 | } else { | |
26296c48 JG |
5248 | /* Unknown option or other error. |
5249 | * Error is printed by getopt, just return */ | |
5250 | ret = -1; | |
5251 | } | |
5252 | ||
f3dd7ce7 | 5253 | end: |
c5d350b2 JG |
5254 | if (ret == -EINVAL) { |
5255 | const char *opt_name = "unknown"; | |
5256 | int i; | |
5257 | ||
5258 | for (i = 0; i < sizeof(long_options) / sizeof(struct option); | |
5259 | i++) { | |
5260 | if (opt == long_options[i].val) { | |
5261 | opt_name = long_options[i].name; | |
5262 | break; | |
5263 | } | |
5264 | } | |
5265 | ||
5266 | WARN("Invalid argument provided for option \"%s\", using default value.", | |
5267 | opt_name); | |
5268 | } | |
f3dd7ce7 | 5269 | |
26296c48 JG |
5270 | return ret; |
5271 | } | |
5272 | ||
5273 | /* | |
5274 | * config_entry_handler_cb used to handle options read from a config file. | |
f40ef1d5 | 5275 | * See config_entry_handler_cb comment in common/config/session-config.h for the |
26296c48 JG |
5276 | * return value conventions. |
5277 | */ | |
5278 | static int config_entry_handler(const struct config_entry *entry, void *unused) | |
5279 | { | |
5280 | int ret = 0, i; | |
5281 | ||
5282 | if (!entry || !entry->name || !entry->value) { | |
5283 | ret = -EINVAL; | |
5284 | goto end; | |
5285 | } | |
5286 | ||
5287 | /* Check if the option is to be ignored */ | |
5288 | for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) { | |
5289 | if (!strcmp(entry->name, config_ignore_options[i])) { | |
5290 | goto end; | |
5291 | } | |
5292 | } | |
5293 | ||
5294 | for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; | |
5295 | i++) { | |
5296 | ||
5297 | /* Ignore if not fully matched. */ | |
5298 | if (strcmp(entry->name, long_options[i].name)) { | |
5299 | continue; | |
5300 | } | |
5301 | ||
5302 | /* | |
5303 | * If the option takes no argument on the command line, we have to | |
5304 | * check if the value is "true". We support non-zero numeric values, | |
5305 | * true, on and yes. | |
5306 | */ | |
5307 | if (!long_options[i].has_arg) { | |
5308 | ret = config_parse_value(entry->value); | |
5309 | if (ret <= 0) { | |
5310 | if (ret) { | |
5311 | WARN("Invalid configuration value \"%s\" for option %s", | |
5312 | entry->value, entry->name); | |
5313 | } | |
5314 | /* False, skip boolean config option. */ | |
5315 | goto end; | |
4d076222 | 5316 | } |
26296c48 JG |
5317 | } |
5318 | ||
5319 | ret = set_option(long_options[i].val, entry->value, entry->name); | |
5320 | goto end; | |
5321 | } | |
5322 | ||
5323 | WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name); | |
5324 | ||
5325 | end: | |
5326 | return ret; | |
5327 | } | |
5328 | ||
5329 | /* | |
5330 | * daemon configuration loading and argument parsing | |
5331 | */ | |
5332 | static int set_options(int argc, char **argv) | |
5333 | { | |
5334 | int ret = 0, c = 0, option_index = 0; | |
5335 | int orig_optopt = optopt, orig_optind = optind; | |
5336 | char *optstring; | |
5337 | const char *config_path = NULL; | |
5338 | ||
5339 | optstring = utils_generate_optstring(long_options, | |
5340 | sizeof(long_options) / sizeof(struct option)); | |
5341 | if (!optstring) { | |
5342 | ret = -ENOMEM; | |
5343 | goto end; | |
5344 | } | |
5345 | ||
5346 | /* Check for the --config option */ | |
5347 | while ((c = getopt_long(argc, argv, optstring, long_options, | |
5348 | &option_index)) != -1) { | |
5349 | if (c == '?') { | |
5350 | ret = -EINVAL; | |
5351 | goto end; | |
5352 | } else if (c != 'f') { | |
5353 | /* if not equal to --config option. */ | |
5354 | continue; | |
5355 | } | |
5356 | ||
e8fa9fb0 MD |
5357 | if (lttng_is_setuid_setgid()) { |
5358 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5359 | "-f, --config"); | |
5360 | } else { | |
5361 | config_path = utils_expand_path(optarg); | |
5362 | if (!config_path) { | |
5363 | ERR("Failed to resolve path: %s", optarg); | |
5364 | } | |
26296c48 JG |
5365 | } |
5366 | } | |
5367 | ||
5368 | ret = config_get_section_entries(config_path, config_section_name, | |
5369 | config_entry_handler, NULL); | |
5370 | if (ret) { | |
5371 | if (ret > 0) { | |
5372 | ERR("Invalid configuration option at line %i", ret); | |
5373 | ret = -1; | |
5374 | } | |
5375 | goto end; | |
5376 | } | |
5377 | ||
5378 | /* Reset getopt's global state */ | |
5379 | optopt = orig_optopt; | |
5380 | optind = orig_optind; | |
5381 | while (1) { | |
c0232ea5 JG |
5382 | option_index = -1; |
5383 | /* | |
5384 | * getopt_long() will not set option_index if it encounters a | |
5385 | * short option. | |
5386 | */ | |
5387 | c = getopt_long(argc, argv, optstring, long_options, | |
5388 | &option_index); | |
26296c48 | 5389 | if (c == -1) { |
4d076222 DG |
5390 | break; |
5391 | } | |
26296c48 | 5392 | |
c0232ea5 JG |
5393 | /* |
5394 | * Pass NULL as the long option name if popt left the index | |
5395 | * unset. | |
5396 | */ | |
5397 | ret = set_option(c, optarg, | |
5398 | option_index < 0 ? NULL : | |
5399 | long_options[option_index].name); | |
26296c48 JG |
5400 | if (ret < 0) { |
5401 | break; | |
fac6795d DG |
5402 | } |
5403 | } | |
5404 | ||
26296c48 JG |
5405 | end: |
5406 | free(optstring); | |
5407 | return ret; | |
fac6795d DG |
5408 | } |
5409 | ||
5410 | /* | |
d063d709 | 5411 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
5412 | * apps_sock - The communication socket for all UST apps. |
5413 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 5414 | */ |
cf3af59e | 5415 | static int init_daemon_socket(void) |
fac6795d DG |
5416 | { |
5417 | int ret = 0; | |
5418 | mode_t old_umask; | |
5419 | ||
5420 | old_umask = umask(0); | |
5421 | ||
5422 | /* Create client tool unix socket */ | |
e6142f2e | 5423 | client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value); |
d6f42150 | 5424 | if (client_sock < 0) { |
e6142f2e | 5425 | ERR("Create unix sock failed: %s", config.client_unix_sock_path.value); |
fac6795d DG |
5426 | ret = -1; |
5427 | goto end; | |
5428 | } | |
5429 | ||
b662582b DG |
5430 | /* Set the cloexec flag */ |
5431 | ret = utils_set_fd_cloexec(client_sock); | |
5432 | if (ret < 0) { | |
5433 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
5434 | "Continuing but note that the consumer daemon will have a " | |
5435 | "reference to this socket on exec()", client_sock); | |
5436 | } | |
5437 | ||
fac6795d | 5438 | /* File permission MUST be 660 */ |
e6142f2e | 5439 | ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
fac6795d | 5440 | if (ret < 0) { |
e6142f2e | 5441 | ERR("Set file permissions failed: %s", config.client_unix_sock_path.value); |
76d7553f | 5442 | PERROR("chmod"); |
fac6795d DG |
5443 | goto end; |
5444 | } | |
5445 | ||
5446 | /* Create the application unix socket */ | |
e6142f2e | 5447 | apps_sock = lttcomm_create_unix_sock(config.apps_unix_sock_path.value); |
d6f42150 | 5448 | if (apps_sock < 0) { |
e6142f2e | 5449 | ERR("Create unix sock failed: %s", config.apps_unix_sock_path.value); |
fac6795d DG |
5450 | ret = -1; |
5451 | goto end; | |
5452 | } | |
5453 | ||
b662582b DG |
5454 | /* Set the cloexec flag */ |
5455 | ret = utils_set_fd_cloexec(apps_sock); | |
5456 | if (ret < 0) { | |
5457 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
5458 | "Continuing but note that the consumer daemon will have a " | |
5459 | "reference to this socket on exec()", apps_sock); | |
5460 | } | |
5461 | ||
d6f42150 | 5462 | /* File permission MUST be 666 */ |
e6142f2e | 5463 | ret = chmod(config.apps_unix_sock_path.value, |
54d01ffb | 5464 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
fac6795d | 5465 | if (ret < 0) { |
e6142f2e | 5466 | ERR("Set file permissions failed: %s", config.apps_unix_sock_path.value); |
76d7553f | 5467 | PERROR("chmod"); |
fac6795d DG |
5468 | goto end; |
5469 | } | |
5470 | ||
b662582b DG |
5471 | DBG3("Session daemon client socket %d and application socket %d created", |
5472 | client_sock, apps_sock); | |
5473 | ||
fac6795d DG |
5474 | end: |
5475 | umask(old_umask); | |
5476 | return ret; | |
5477 | } | |
5478 | ||
f472090a JG |
5479 | /* |
5480 | * Create lockfile using the rundir and return its fd. | |
5481 | */ | |
5482 | static int create_lockfile(void) | |
5483 | { | |
5484 | return utils_create_lock_file(config.lock_file_path.value); | |
5485 | } | |
5486 | ||
fac6795d | 5487 | /* |
54d01ffb DG |
5488 | * Check if the global socket is available, and if a daemon is answering at the |
5489 | * other side. If yes, error is returned. | |
f472090a JG |
5490 | * |
5491 | * Also attempts to create and hold the lock file. | |
fac6795d | 5492 | */ |
cf3af59e | 5493 | static int check_existing_daemon(void) |
fac6795d | 5494 | { |
f472090a JG |
5495 | int ret = 0; |
5496 | ||
7d8234d9 | 5497 | /* Is there anybody out there ? */ |
099e26bd | 5498 | if (lttng_session_daemon_alive()) { |
f472090a JG |
5499 | ret = -EEXIST; |
5500 | goto end; | |
099e26bd | 5501 | } |
b09c7c76 | 5502 | |
f472090a JG |
5503 | lockfile_fd = create_lockfile(); |
5504 | if (lockfile_fd < 0) { | |
5505 | ret = -EEXIST; | |
5506 | goto end; | |
5507 | } | |
5508 | end: | |
5509 | return ret; | |
5510 | } | |
5511 | ||
5512 | static void sessiond_cleanup_lock_file(void) | |
5513 | { | |
5514 | int ret; | |
5515 | ||
5516 | /* | |
5517 | * Cleanup lock file by deleting it and finaly closing it which will | |
5518 | * release the file system lock. | |
5519 | */ | |
5520 | if (lockfile_fd >= 0) { | |
5521 | ret = remove(config.lock_file_path.value); | |
5522 | if (ret < 0) { | |
5523 | PERROR("remove lock file"); | |
5524 | } | |
5525 | ret = close(lockfile_fd); | |
5526 | if (ret < 0) { | |
5527 | PERROR("close lock file"); | |
5528 | } | |
5529 | } | |
fac6795d DG |
5530 | } |
5531 | ||
fac6795d | 5532 | /* |
d063d709 | 5533 | * Set the tracing group gid onto the client socket. |
5e16da05 | 5534 | * |
d063d709 | 5535 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 5536 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 5537 | */ |
be040666 | 5538 | static int set_permissions(char *rundir) |
fac6795d DG |
5539 | { |
5540 | int ret; | |
996b65c8 | 5541 | gid_t gid; |
fac6795d | 5542 | |
e6142f2e | 5543 | gid = utils_get_group_id(config.tracing_group_name.value); |
fac6795d | 5544 | |
d6f42150 | 5545 | /* Set lttng run dir */ |
be040666 | 5546 | ret = chown(rundir, 0, gid); |
d6f42150 | 5547 | if (ret < 0) { |
be040666 | 5548 | ERR("Unable to set group on %s", rundir); |
76d7553f | 5549 | PERROR("chown"); |
d6f42150 DG |
5550 | } |
5551 | ||
6c71277b MD |
5552 | /* |
5553 | * Ensure all applications and tracing group can search the run | |
5554 | * dir. Allow everyone to read the directory, since it does not | |
5555 | * buy us anything to hide its content. | |
5556 | */ | |
5557 | ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
d1613cf5 JN |
5558 | if (ret < 0) { |
5559 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 5560 | PERROR("chmod"); |
d1613cf5 JN |
5561 | } |
5562 | ||
d6f42150 | 5563 | /* lttng client socket path */ |
e6142f2e | 5564 | ret = chown(config.client_unix_sock_path.value, 0, gid); |
fac6795d | 5565 | if (ret < 0) { |
e6142f2e | 5566 | ERR("Unable to set group on %s", config.client_unix_sock_path.value); |
76d7553f | 5567 | PERROR("chown"); |
d6f42150 DG |
5568 | } |
5569 | ||
3bd1e081 | 5570 | /* kconsumer error socket path */ |
6c71277b | 5571 | ret = chown(kconsumer_data.err_unix_sock_path, 0, 0); |
d6f42150 | 5572 | if (ret < 0) { |
3bd1e081 | 5573 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 5574 | PERROR("chown"); |
3bd1e081 MD |
5575 | } |
5576 | ||
7753dea8 | 5577 | /* 64-bit ustconsumer error socket path */ |
6c71277b | 5578 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0); |
7753dea8 MD |
5579 | if (ret < 0) { |
5580 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 5581 | PERROR("chown"); |
7753dea8 MD |
5582 | } |
5583 | ||
5584 | /* 32-bit ustconsumer compat32 error socket path */ | |
6c71277b | 5585 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0); |
3bd1e081 | 5586 | if (ret < 0) { |
7753dea8 | 5587 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 5588 | PERROR("chown"); |
fac6795d DG |
5589 | } |
5590 | ||
d6f42150 | 5591 | DBG("All permissions are set"); |
e07ae692 | 5592 | |
fac6795d DG |
5593 | return ret; |
5594 | } | |
5595 | ||
d6f42150 | 5596 | /* |
d063d709 | 5597 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 5598 | */ |
e6142f2e | 5599 | static int create_lttng_rundir(void) |
d6f42150 DG |
5600 | { |
5601 | int ret; | |
5602 | ||
e6142f2e | 5603 | DBG3("Creating LTTng run directory: %s", config.rundir.value); |
67e40797 | 5604 | |
e6142f2e | 5605 | ret = mkdir(config.rundir.value, S_IRWXU); |
d6f42150 | 5606 | if (ret < 0) { |
b1f11e69 | 5607 | if (errno != EEXIST) { |
e6142f2e | 5608 | ERR("Unable to create %s", config.rundir.value); |
b1f11e69 DG |
5609 | goto error; |
5610 | } else { | |
5611 | ret = 0; | |
5612 | } | |
d6f42150 DG |
5613 | } |
5614 | ||
5615 | error: | |
5616 | return ret; | |
5617 | } | |
5618 | ||
5619 | /* | |
e6142f2e | 5620 | * Setup sockets and directory needed by the consumerds' communication with the |
d063d709 | 5621 | * session daemon. |
d6f42150 | 5622 | */ |
e6142f2e | 5623 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
d6f42150 DG |
5624 | { |
5625 | int ret; | |
e6142f2e | 5626 | char *path = NULL; |
d6f42150 | 5627 | |
6c71277b | 5628 | switch (consumer_data->type) { |
7753dea8 | 5629 | case LTTNG_CONSUMER_KERNEL: |
e6142f2e | 5630 | path = config.kconsumerd_path.value; |
7753dea8 MD |
5631 | break; |
5632 | case LTTNG_CONSUMER64_UST: | |
e6142f2e | 5633 | path = config.consumerd64_path.value; |
7753dea8 MD |
5634 | break; |
5635 | case LTTNG_CONSUMER32_UST: | |
e6142f2e | 5636 | path = config.consumerd32_path.value; |
7753dea8 MD |
5637 | break; |
5638 | default: | |
5639 | ERR("Consumer type unknown"); | |
5640 | ret = -EINVAL; | |
5641 | goto error; | |
d6f42150 | 5642 | } |
e6142f2e | 5643 | assert(path); |
d6f42150 | 5644 | |
67e40797 DG |
5645 | DBG2("Creating consumer directory: %s", path); |
5646 | ||
6c71277b | 5647 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP); |
e7e1ef17 JR |
5648 | if (ret < 0 && errno != EEXIST) { |
5649 | PERROR("mkdir"); | |
5650 | ERR("Failed to create %s", path); | |
5651 | goto error; | |
d6f42150 | 5652 | } |
6c71277b | 5653 | if (is_root) { |
e6142f2e | 5654 | ret = chown(path, 0, utils_get_group_id(config.tracing_group_name.value)); |
6c71277b MD |
5655 | if (ret < 0) { |
5656 | ERR("Unable to set group on %s", path); | |
5657 | PERROR("chown"); | |
5658 | goto error; | |
5659 | } | |
5660 | } | |
d6f42150 | 5661 | |
e6142f2e | 5662 | /* Create the consumerd error unix socket */ |
3bd1e081 MD |
5663 | consumer_data->err_sock = |
5664 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
5665 | if (consumer_data->err_sock < 0) { | |
5666 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
5667 | ret = -1; |
5668 | goto error; | |
5669 | } | |
5670 | ||
a24f05ab MD |
5671 | /* |
5672 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
5673 | * show must go on. | |
5674 | */ | |
5675 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
5676 | if (ret < 0) { | |
5677 | PERROR("utils_set_fd_cloexec"); | |
5678 | /* continue anyway */ | |
5679 | } | |
5680 | ||
d6f42150 | 5681 | /* File permission MUST be 660 */ |
3bd1e081 | 5682 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 5683 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 5684 | if (ret < 0) { |
3bd1e081 | 5685 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 5686 | PERROR("chmod"); |
d6f42150 DG |
5687 | goto error; |
5688 | } | |
5689 | ||
5690 | error: | |
5691 | return ret; | |
5692 | } | |
5693 | ||
fac6795d | 5694 | /* |
d063d709 | 5695 | * Signal handler for the daemon |
cf3af59e | 5696 | * |
54d01ffb DG |
5697 | * Simply stop all worker threads, leaving main() return gracefully after |
5698 | * joining all threads and calling cleanup(). | |
fac6795d DG |
5699 | */ |
5700 | static void sighandler(int sig) | |
5701 | { | |
5702 | switch (sig) { | |
cf3af59e | 5703 | case SIGINT: |
af87c45a | 5704 | DBG("SIGINT caught"); |
cf3af59e MD |
5705 | stop_threads(); |
5706 | break; | |
5707 | case SIGTERM: | |
af87c45a | 5708 | DBG("SIGTERM caught"); |
cf3af59e MD |
5709 | stop_threads(); |
5710 | break; | |
0bb7724a DG |
5711 | case SIGUSR1: |
5712 | CMM_STORE_SHARED(recv_child_signal, 1); | |
5713 | break; | |
cf3af59e MD |
5714 | default: |
5715 | break; | |
fac6795d | 5716 | } |
fac6795d DG |
5717 | } |
5718 | ||
5719 | /* | |
d063d709 | 5720 | * Setup signal handler for : |
1d4b027a | 5721 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 5722 | */ |
1d4b027a | 5723 | static int set_signal_handler(void) |
fac6795d | 5724 | { |
1d4b027a DG |
5725 | int ret = 0; |
5726 | struct sigaction sa; | |
5727 | sigset_t sigset; | |
fac6795d | 5728 | |
1d4b027a | 5729 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 5730 | PERROR("sigemptyset"); |
1d4b027a DG |
5731 | return ret; |
5732 | } | |
d6f42150 | 5733 | |
1d4b027a DG |
5734 | sa.sa_mask = sigset; |
5735 | sa.sa_flags = 0; | |
0072e5e2 MD |
5736 | |
5737 | sa.sa_handler = sighandler; | |
1d4b027a | 5738 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
76d7553f | 5739 | PERROR("sigaction"); |
1d4b027a | 5740 | return ret; |
d6f42150 DG |
5741 | } |
5742 | ||
1d4b027a | 5743 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 5744 | PERROR("sigaction"); |
1d4b027a | 5745 | return ret; |
d6f42150 | 5746 | } |
aaf26714 | 5747 | |
0072e5e2 | 5748 | if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) { |
76d7553f | 5749 | PERROR("sigaction"); |
1d4b027a | 5750 | return ret; |
8c0faa1d DG |
5751 | } |
5752 | ||
0072e5e2 MD |
5753 | sa.sa_handler = SIG_IGN; |
5754 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
0bb7724a DG |
5755 | PERROR("sigaction"); |
5756 | return ret; | |
5757 | } | |
5758 | ||
5759 | DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT"); | |
1d4b027a DG |
5760 | |
5761 | return ret; | |
fac6795d DG |
5762 | } |
5763 | ||
f3ed775e | 5764 | /* |
d063d709 | 5765 | * Set open files limit to unlimited. This daemon can open a large number of |
514bb9f0 | 5766 | * file descriptors in order to consume multiple kernel traces. |
f3ed775e DG |
5767 | */ |
5768 | static void set_ulimit(void) | |
5769 | { | |
5770 | int ret; | |
5771 | struct rlimit lim; | |
5772 | ||
514bb9f0 | 5773 | /* The kernel does not allow an infinite limit for open files */ |
f3ed775e DG |
5774 | lim.rlim_cur = 65535; |
5775 | lim.rlim_max = 65535; | |
5776 | ||
5777 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
5778 | if (ret < 0) { | |
76d7553f | 5779 | PERROR("failed to set open files limit"); |
f3ed775e DG |
5780 | } |
5781 | } | |
5782 | ||
4a15001e | 5783 | static int write_pidfile(void) |
35f90c40 | 5784 | { |
e6142f2e | 5785 | return utils_create_pid_file(getpid(), config.pid_file_path.value); |
35f90c40 DG |
5786 | } |
5787 | ||
e6142f2e JG |
5788 | static int set_clock_plugin_env(void) |
5789 | { | |
5790 | int ret = 0; | |
5791 | char *env_value = NULL; | |
cd9290dd | 5792 | |
e6142f2e JG |
5793 | if (!config.lttng_ust_clock_plugin.value) { |
5794 | goto end; | |
5795 | } | |
5796 | ||
5797 | ret = asprintf(&env_value, "LTTNG_UST_CLOCK_PLUGIN=%s", | |
5798 | config.lttng_ust_clock_plugin.value); | |
cd9290dd | 5799 | if (ret < 0) { |
e6142f2e JG |
5800 | PERROR("asprintf"); |
5801 | goto end; | |
cd9290dd DG |
5802 | } |
5803 | ||
e6142f2e JG |
5804 | ret = putenv(env_value); |
5805 | if (ret) { | |
5806 | free(env_value); | |
5807 | PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN"); | |
5808 | goto end; | |
5809 | } | |
cd9290dd | 5810 | |
e6142f2e JG |
5811 | DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"", |
5812 | config.lttng_ust_clock_plugin.value); | |
5813 | end: | |
4a15001e | 5814 | return ret; |
ef367a93 JG |
5815 | } |
5816 | ||
fac6795d DG |
5817 | /* |
5818 | * main | |
5819 | */ | |
5820 | int main(int argc, char **argv) | |
5821 | { | |
4a15001e | 5822 | int ret = 0, retval = 0; |
fac6795d | 5823 | void *status; |
e6142f2e | 5824 | const char *env_app_timeout; |
b3530820 JG |
5825 | struct lttng_pipe *ust32_channel_monitor_pipe = NULL, |
5826 | *ust64_channel_monitor_pipe = NULL, | |
5827 | *kernel_channel_monitor_pipe = NULL; | |
99611076 JG |
5828 | bool notification_thread_launched = false; |
5829 | bool rotation_thread_launched = false; | |
5830 | bool timer_thread_launched = false; | |
d086f507 JD |
5831 | struct timer_thread_parameters timer_thread_ctx; |
5832 | /* Queue of rotation jobs populated by the sessiond-timer. */ | |
5833 | struct rotation_thread_timer_queue *rotation_timer_queue = NULL; | |
90936dcf | 5834 | sem_t notification_thread_ready; |
fac6795d | 5835 | |
335a95b7 MD |
5836 | init_kernel_workarounds(); |
5837 | ||
f6a9efaa DG |
5838 | rcu_register_thread(); |
5839 | ||
4a15001e MD |
5840 | if (set_signal_handler()) { |
5841 | retval = -1; | |
5842 | goto exit_set_signal_handler; | |
0bb7724a DG |
5843 | } |
5844 | ||
92816cc3 | 5845 | if (timer_signal_init()) { |
d086f507 JD |
5846 | retval = -1; |
5847 | goto exit_set_signal_handler; | |
5848 | } | |
5849 | ||
12744796 DG |
5850 | page_size = sysconf(_SC_PAGESIZE); |
5851 | if (page_size < 0) { | |
5852 | PERROR("sysconf _SC_PAGESIZE"); | |
5853 | page_size = LONG_MAX; | |
5854 | WARN("Fallback page size to %ld", page_size); | |
5855 | } | |
5856 | ||
e6142f2e JG |
5857 | ret = sessiond_config_init(&config); |
5858 | if (ret) { | |
5859 | retval = -1; | |
5860 | goto exit_set_signal_handler; | |
5861 | } | |
5862 | ||
2788b494 JR |
5863 | /* |
5864 | * Init config from environment variables. | |
5865 | * Command line option override env configuration per-doc. Do env first. | |
5866 | */ | |
5867 | sessiond_config_apply_env_config(&config); | |
5868 | ||
4a15001e MD |
5869 | /* |
5870 | * Parse arguments and load the daemon configuration file. | |
5871 | * | |
5872 | * We have an exit_options exit path to free memory reserved by | |
5873 | * set_options. This is needed because the rest of sessiond_cleanup() | |
5874 | * depends on ht_cleanup_thread, which depends on lttng_daemonize, which | |
5875 | * depends on set_options. | |
5876 | */ | |
fac6795d | 5877 | progname = argv[0]; |
4a15001e MD |
5878 | if (set_options(argc, argv)) { |
5879 | retval = -1; | |
5880 | goto exit_options; | |
fac6795d DG |
5881 | } |
5882 | ||
e6142f2e JG |
5883 | /* |
5884 | * Resolve all paths received as arguments, configuration option, or | |
5885 | * through environment variable as absolute paths. This is necessary | |
5886 | * since daemonizing causes the sessiond's current working directory | |
5887 | * to '/'. | |
5888 | */ | |
5889 | ret = sessiond_config_resolve_paths(&config); | |
5890 | if (ret) { | |
5891 | goto exit_options; | |
5892 | } | |
5893 | ||
5894 | /* Apply config. */ | |
5895 | lttng_opt_verbose = config.verbose; | |
5896 | lttng_opt_quiet = config.quiet; | |
5897 | kconsumer_data.err_unix_sock_path = | |
5898 | config.kconsumerd_err_unix_sock_path.value; | |
5899 | kconsumer_data.cmd_unix_sock_path = | |
5900 | config.kconsumerd_cmd_unix_sock_path.value; | |
5901 | ustconsumer32_data.err_unix_sock_path = | |
5902 | config.consumerd32_err_unix_sock_path.value; | |
5903 | ustconsumer32_data.cmd_unix_sock_path = | |
5904 | config.consumerd32_cmd_unix_sock_path.value; | |
5905 | ustconsumer64_data.err_unix_sock_path = | |
5906 | config.consumerd64_err_unix_sock_path.value; | |
5907 | ustconsumer64_data.cmd_unix_sock_path = | |
5908 | config.consumerd64_cmd_unix_sock_path.value; | |
5909 | set_clock_plugin_env(); | |
5910 | ||
5911 | sessiond_config_log(&config); | |
5912 | ||
f472090a JG |
5913 | if (create_lttng_rundir()) { |
5914 | retval = -1; | |
5915 | goto exit_options; | |
5916 | } | |
5917 | ||
5918 | /* Abort launch if a session daemon is already running. */ | |
5919 | if (check_existing_daemon()) { | |
5920 | ERR("A session daemon is already running."); | |
5921 | retval = -1; | |
5922 | goto exit_options; | |
5923 | } | |
5924 | ||
fac6795d | 5925 | /* Daemonize */ |
e6142f2e | 5926 | if (config.daemonize || config.background) { |
ceed52b5 MD |
5927 | int i; |
5928 | ||
72dd7491 | 5929 | ret = lttng_daemonize(&child_ppid, &recv_child_signal, |
e6142f2e | 5930 | !config.background); |
53094c05 | 5931 | if (ret < 0) { |
4a15001e MD |
5932 | retval = -1; |
5933 | goto exit_options; | |
53094c05 | 5934 | } |
0bb7724a | 5935 | |
ceed52b5 | 5936 | /* |
0bb7724a | 5937 | * We are in the child. Make sure all other file descriptors are |
4a15001e | 5938 | * closed, in case we are called with more opened file |
f472090a | 5939 | * descriptors than the standard ones and the lock file. |
ceed52b5 MD |
5940 | */ |
5941 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
f472090a JG |
5942 | if (i == lockfile_fd) { |
5943 | continue; | |
5944 | } | |
ceed52b5 MD |
5945 | (void) close(i); |
5946 | } | |
5947 | } | |
5948 | ||
7567352f MD |
5949 | if (run_as_create_worker(argv[0]) < 0) { |
5950 | goto exit_create_run_as_worker_cleanup; | |
5951 | } | |
5952 | ||
4a15001e MD |
5953 | /* |
5954 | * Starting from here, we can create threads. This needs to be after | |
5955 | * lttng_daemonize due to RCU. | |
5956 | */ | |
5957 | ||
5958 | /* | |
5959 | * Initialize the health check subsystem. This call should set the | |
5960 | * appropriate time values. | |
5961 | */ | |
5962 | health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES); | |
5963 | if (!health_sessiond) { | |
5964 | PERROR("health_app_create error"); | |
5965 | retval = -1; | |
5966 | goto exit_health_sessiond_cleanup; | |
5967 | } | |
5968 | ||
4a15001e | 5969 | /* Create thread to clean up RCU hash tables */ |
5e97de00 | 5970 | if (init_ht_cleanup_thread(&ht_cleanup_thread)) { |
4a15001e MD |
5971 | retval = -1; |
5972 | goto exit_ht_cleanup; | |
5973 | } | |
5974 | ||
ceed52b5 | 5975 | /* Create thread quit pipe */ |
4a15001e MD |
5976 | if (init_thread_quit_pipe()) { |
5977 | retval = -1; | |
5978 | goto exit_init_data; | |
fac6795d DG |
5979 | } |
5980 | ||
5981 | /* Check if daemon is UID = 0 */ | |
5982 | is_root = !getuid(); | |
fac6795d | 5983 | if (is_root) { |
67e40797 | 5984 | /* Create global run dir with root access */ |
67e40797 | 5985 | |
b3530820 JG |
5986 | kernel_channel_monitor_pipe = lttng_pipe_open(0); |
5987 | if (!kernel_channel_monitor_pipe) { | |
5988 | ERR("Failed to create kernel consumer channel monitor pipe"); | |
5989 | retval = -1; | |
5990 | goto exit_init_data; | |
5991 | } | |
5992 | kconsumer_data.channel_monitor_pipe = | |
5993 | lttng_pipe_release_writefd( | |
5994 | kernel_channel_monitor_pipe); | |
5995 | if (kconsumer_data.channel_monitor_pipe < 0) { | |
5996 | retval = -1; | |
5997 | goto exit_init_data; | |
5998 | } | |
fac6795d DG |
5999 | } |
6000 | ||
5c827ce0 DG |
6001 | /* Set consumer initial state */ |
6002 | kernel_consumerd_state = CONSUMER_STOPPED; | |
6003 | ust_consumerd_state = CONSUMER_STOPPED; | |
6004 | ||
b3530820 JG |
6005 | ust32_channel_monitor_pipe = lttng_pipe_open(0); |
6006 | if (!ust32_channel_monitor_pipe) { | |
6007 | ERR("Failed to create 32-bit user space consumer channel monitor pipe"); | |
6008 | retval = -1; | |
6009 | goto exit_init_data; | |
6010 | } | |
6011 | ustconsumer32_data.channel_monitor_pipe = lttng_pipe_release_writefd( | |
6012 | ust32_channel_monitor_pipe); | |
6013 | if (ustconsumer32_data.channel_monitor_pipe < 0) { | |
6014 | retval = -1; | |
6015 | goto exit_init_data; | |
6016 | } | |
62c43103 | 6017 | |
d086f507 | 6018 | /* |
92816cc3 JG |
6019 | * The rotation_thread_timer_queue structure is shared between the |
6020 | * sessiond timer thread and the rotation thread. The main thread keeps | |
6021 | * its ownership and destroys it when both threads have been joined. | |
d086f507 | 6022 | */ |
92816cc3 | 6023 | rotation_timer_queue = rotation_thread_timer_queue_create(); |
d086f507 JD |
6024 | if (!rotation_timer_queue) { |
6025 | retval = -1; | |
6026 | goto exit_init_data; | |
6027 | } | |
92816cc3 | 6028 | timer_thread_ctx.rotation_thread_job_queue = rotation_timer_queue; |
67e40797 | 6029 | |
b3530820 JG |
6030 | ust64_channel_monitor_pipe = lttng_pipe_open(0); |
6031 | if (!ust64_channel_monitor_pipe) { | |
6032 | ERR("Failed to create 64-bit user space consumer channel monitor pipe"); | |
6033 | retval = -1; | |
6034 | goto exit_init_data; | |
6035 | } | |
6036 | ustconsumer64_data.channel_monitor_pipe = lttng_pipe_release_writefd( | |
6037 | ust64_channel_monitor_pipe); | |
6038 | if (ustconsumer64_data.channel_monitor_pipe < 0) { | |
6039 | retval = -1; | |
6040 | goto exit_init_data; | |
6041 | } | |
847177cd | 6042 | |
1427f9b2 DG |
6043 | /* |
6044 | * Init UST app hash table. Alloc hash table before this point since | |
6045 | * cleanup() can get called after that point. | |
6046 | */ | |
4a15001e | 6047 | if (ust_app_ht_alloc()) { |
ddbeb0f6 | 6048 | ERR("Failed to allocate UST app hash table"); |
4a15001e MD |
6049 | retval = -1; |
6050 | goto exit_init_data; | |
6051 | } | |
1427f9b2 | 6052 | |
6a4e4039 JG |
6053 | /* |
6054 | * Initialize agent app hash table. We allocate the hash table here | |
6055 | * since cleanup() can get called after this point. | |
6056 | */ | |
6057 | if (agent_app_ht_alloc()) { | |
6058 | ERR("Failed to allocate Agent app hash table"); | |
4a15001e MD |
6059 | retval = -1; |
6060 | goto exit_init_data; | |
f20baf8e DG |
6061 | } |
6062 | ||
a88df331 DG |
6063 | /* |
6064 | * These actions must be executed as root. We do that *after* setting up | |
6065 | * the sockets path because we MUST make the check for another daemon using | |
6066 | * those paths *before* trying to set the kernel consumer sockets and init | |
6067 | * kernel tracer. | |
6068 | */ | |
6069 | if (is_root) { | |
e6142f2e | 6070 | if (set_consumer_sockets(&kconsumer_data)) { |
4a15001e MD |
6071 | retval = -1; |
6072 | goto exit_init_data; | |
7753dea8 MD |
6073 | } |
6074 | ||
a88df331 | 6075 | /* Setup kernel tracer */ |
e6142f2e | 6076 | if (!config.no_kernel) { |
4fba7219 | 6077 | init_kernel_tracer(); |
89588270 DG |
6078 | if (kernel_tracer_fd >= 0) { |
6079 | ret = syscall_init_table(); | |
6080 | if (ret < 0) { | |
4a15001e MD |
6081 | ERR("Unable to populate syscall table. " |
6082 | "Syscall tracing won't work " | |
6083 | "for this session daemon."); | |
89588270 | 6084 | } |
834978fd | 6085 | } |
4fba7219 | 6086 | } |
a88df331 DG |
6087 | |
6088 | /* Set ulimit for open files */ | |
6089 | set_ulimit(); | |
fac6795d | 6090 | } |
4063050c MD |
6091 | /* init lttng_fd tracking must be done after set_ulimit. */ |
6092 | lttng_fd_init(); | |
fac6795d | 6093 | |
e6142f2e | 6094 | if (set_consumer_sockets(&ustconsumer64_data)) { |
4a15001e MD |
6095 | retval = -1; |
6096 | goto exit_init_data; | |
67e40797 DG |
6097 | } |
6098 | ||
e6142f2e | 6099 | if (set_consumer_sockets(&ustconsumer32_data)) { |
4a15001e MD |
6100 | retval = -1; |
6101 | goto exit_init_data; | |
67e40797 DG |
6102 | } |
6103 | ||
d6f42150 | 6104 | /* Setup the needed unix socket */ |
4a15001e MD |
6105 | if (init_daemon_socket()) { |
6106 | retval = -1; | |
6107 | goto exit_init_data; | |
fac6795d DG |
6108 | } |
6109 | ||
6110 | /* Set credentials to socket */ | |
e6142f2e | 6111 | if (is_root && set_permissions(config.rundir.value)) { |
4a15001e MD |
6112 | retval = -1; |
6113 | goto exit_init_data; | |
fac6795d DG |
6114 | } |
6115 | ||
5b8719f5 | 6116 | /* Get parent pid if -S, --sig-parent is specified. */ |
e6142f2e | 6117 | if (config.sig_parent) { |
5b8719f5 DG |
6118 | ppid = getppid(); |
6119 | } | |
6120 | ||
7a485870 | 6121 | /* Setup the kernel pipe for waking up the kernel thread */ |
e6142f2e | 6122 | if (is_root && !config.no_kernel) { |
4a15001e MD |
6123 | if (utils_create_pipe_cloexec(kernel_poll_pipe)) { |
6124 | retval = -1; | |
6125 | goto exit_init_data; | |
6620da75 | 6126 | } |
7a485870 DG |
6127 | } |
6128 | ||
099e26bd | 6129 | /* Setup the thread apps communication pipe. */ |
4a15001e MD |
6130 | if (utils_create_pipe_cloexec(apps_cmd_pipe)) { |
6131 | retval = -1; | |
6132 | goto exit_init_data; | |
099e26bd DG |
6133 | } |
6134 | ||
d0b96690 | 6135 | /* Setup the thread apps notify communication pipe. */ |
4a15001e MD |
6136 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) { |
6137 | retval = -1; | |
6138 | goto exit_init_data; | |
d0b96690 DG |
6139 | } |
6140 | ||
7972aab2 DG |
6141 | /* Initialize global buffer per UID and PID registry. */ |
6142 | buffer_reg_init_uid_registry(); | |
6143 | buffer_reg_init_pid_registry(); | |
6144 | ||
099e26bd | 6145 | /* Init UST command queue. */ |
8bdee6e2 | 6146 | cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 6147 | |
273ea72c | 6148 | /* |
4a15001e MD |
6149 | * Get session list pointer. This pointer MUST NOT be free'd. This list |
6150 | * is statically declared in session.c | |
273ea72c | 6151 | */ |
54d01ffb | 6152 | session_list_ptr = session_get_list(); |
b5541356 | 6153 | |
2f77fc4b | 6154 | cmd_init(); |
00e2e675 | 6155 | |
ae9e45b3 DG |
6156 | /* Check for the application socket timeout env variable. */ |
6157 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
6158 | if (env_app_timeout) { | |
e6142f2e | 6159 | config.app_socket_timeout = atoi(env_app_timeout); |
ae9e45b3 | 6160 | } else { |
e6142f2e | 6161 | config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; |
ae9e45b3 DG |
6162 | } |
6163 | ||
4a15001e MD |
6164 | ret = write_pidfile(); |
6165 | if (ret) { | |
6166 | ERR("Error in write_pidfile"); | |
6167 | retval = -1; | |
6168 | goto exit_init_data; | |
6169 | } | |
35f90c40 | 6170 | |
554831e7 MD |
6171 | /* Initialize communication library */ |
6172 | lttcomm_init(); | |
4a15001e | 6173 | /* Initialize TCP timeout values */ |
d831c249 | 6174 | lttcomm_inet_init(); |
554831e7 | 6175 | |
ef367a93 | 6176 | if (load_session_init_data(&load_info) < 0) { |
4a15001e MD |
6177 | retval = -1; |
6178 | goto exit_init_data; | |
ef367a93 | 6179 | } |
e6142f2e | 6180 | load_info->path = config.load_session_path.value; |
ef367a93 | 6181 | |
12b4fb37 | 6182 | /* Create health-check thread. */ |
1a1a34b4 | 6183 | ret = pthread_create(&health_thread, default_pthread_attr(), |
44a5e5eb | 6184 | thread_manage_health, (void *) NULL); |
4a15001e MD |
6185 | if (ret) { |
6186 | errno = ret; | |
44a5e5eb | 6187 | PERROR("pthread_create health"); |
4a15001e | 6188 | retval = -1; |
44a5e5eb DG |
6189 | goto exit_health; |
6190 | } | |
6191 | ||
90936dcf JD |
6192 | /* |
6193 | * The rotation thread needs the notification thread to be ready before | |
6194 | * creating the rotate_notification_channel, so we use this semaphore as | |
6195 | * a rendez-vous point. | |
6196 | */ | |
6197 | sem_init(¬ification_thread_ready, 0, 0); | |
6198 | ||
b3530820 JG |
6199 | /* notification_thread_data acquires the pipes' read side. */ |
6200 | notification_thread_handle = notification_thread_handle_create( | |
6201 | ust32_channel_monitor_pipe, | |
6202 | ust64_channel_monitor_pipe, | |
90936dcf JD |
6203 | kernel_channel_monitor_pipe, |
6204 | ¬ification_thread_ready); | |
b3530820 JG |
6205 | if (!notification_thread_handle) { |
6206 | retval = -1; | |
6207 | ERR("Failed to create notification thread shared data"); | |
6208 | stop_threads(); | |
6209 | goto exit_notification; | |
6210 | } | |
6211 | ||
6212 | /* Create notification thread. */ | |
6213 | ret = pthread_create(¬ification_thread, default_pthread_attr(), | |
6214 | thread_notification, notification_thread_handle); | |
6215 | if (ret) { | |
6216 | errno = ret; | |
6217 | PERROR("pthread_create notification"); | |
6218 | retval = -1; | |
6219 | stop_threads(); | |
6220 | goto exit_notification; | |
6221 | } | |
99611076 | 6222 | notification_thread_launched = true; |
b3530820 | 6223 | |
d086f507 JD |
6224 | /* Create timer thread. */ |
6225 | ret = pthread_create(&timer_thread, default_pthread_attr(), | |
92816cc3 | 6226 | timer_thread_func, &timer_thread_ctx); |
d086f507 JD |
6227 | if (ret) { |
6228 | errno = ret; | |
6229 | PERROR("pthread_create timer"); | |
6230 | retval = -1; | |
6231 | stop_threads(); | |
6232 | goto exit_notification; | |
6233 | } | |
99611076 | 6234 | timer_thread_launched = true; |
d086f507 | 6235 | |
db66e574 JD |
6236 | /* rotation_thread_data acquires the pipes' read side. */ |
6237 | rotation_thread_handle = rotation_thread_handle_create( | |
d086f507 | 6238 | thread_quit_pipe[0], |
90936dcf JD |
6239 | rotation_timer_queue, |
6240 | notification_thread_handle, | |
6241 | ¬ification_thread_ready); | |
db66e574 JD |
6242 | if (!rotation_thread_handle) { |
6243 | retval = -1; | |
6244 | ERR("Failed to create rotation thread shared data"); | |
6245 | stop_threads(); | |
6246 | goto exit_rotation; | |
6247 | } | |
db66e574 JD |
6248 | |
6249 | /* Create rotation thread. */ | |
6250 | ret = pthread_create(&rotation_thread, default_pthread_attr(), | |
6251 | thread_rotation, rotation_thread_handle); | |
6252 | if (ret) { | |
6253 | errno = ret; | |
6254 | PERROR("pthread_create rotation"); | |
6255 | retval = -1; | |
6256 | stop_threads(); | |
6257 | goto exit_rotation; | |
6258 | } | |
99611076 | 6259 | rotation_thread_launched = true; |
db66e574 | 6260 | |
cf3af59e | 6261 | /* Create thread to manage the client socket */ |
1a1a34b4 | 6262 | ret = pthread_create(&client_thread, default_pthread_attr(), |
099e26bd | 6263 | thread_manage_clients, (void *) NULL); |
4a15001e MD |
6264 | if (ret) { |
6265 | errno = ret; | |
76d7553f | 6266 | PERROR("pthread_create clients"); |
4a15001e | 6267 | retval = -1; |
b3530820 | 6268 | stop_threads(); |
cf3af59e MD |
6269 | goto exit_client; |
6270 | } | |
fac6795d | 6271 | |
099e26bd | 6272 | /* Create thread to dispatch registration */ |
1a1a34b4 | 6273 | ret = pthread_create(&dispatch_thread, default_pthread_attr(), |
099e26bd | 6274 | thread_dispatch_ust_registration, (void *) NULL); |
4a15001e MD |
6275 | if (ret) { |
6276 | errno = ret; | |
76d7553f | 6277 | PERROR("pthread_create dispatch"); |
4a15001e | 6278 | retval = -1; |
b3530820 | 6279 | stop_threads(); |
099e26bd DG |
6280 | goto exit_dispatch; |
6281 | } | |
6282 | ||
6283 | /* Create thread to manage application registration. */ | |
1a1a34b4 | 6284 | ret = pthread_create(®_apps_thread, default_pthread_attr(), |
099e26bd | 6285 | thread_registration_apps, (void *) NULL); |
4a15001e MD |
6286 | if (ret) { |
6287 | errno = ret; | |
76d7553f | 6288 | PERROR("pthread_create registration"); |
4a15001e | 6289 | retval = -1; |
b3530820 | 6290 | stop_threads(); |
099e26bd DG |
6291 | goto exit_reg_apps; |
6292 | } | |
6293 | ||
cf3af59e | 6294 | /* Create thread to manage application socket */ |
1a1a34b4 | 6295 | ret = pthread_create(&apps_thread, default_pthread_attr(), |
54d01ffb | 6296 | thread_manage_apps, (void *) NULL); |
4a15001e MD |
6297 | if (ret) { |
6298 | errno = ret; | |
d0b96690 | 6299 | PERROR("pthread_create apps"); |
4a15001e | 6300 | retval = -1; |
b3530820 | 6301 | stop_threads(); |
d0b96690 DG |
6302 | goto exit_apps; |
6303 | } | |
6304 | ||
6305 | /* Create thread to manage application notify socket */ | |
1a1a34b4 | 6306 | ret = pthread_create(&apps_notify_thread, default_pthread_attr(), |
d0b96690 | 6307 | ust_thread_manage_notify, (void *) NULL); |
4a15001e MD |
6308 | if (ret) { |
6309 | errno = ret; | |
f5c32ef1 | 6310 | PERROR("pthread_create notify"); |
4a15001e | 6311 | retval = -1; |
b3530820 | 6312 | stop_threads(); |
9563b0ad | 6313 | goto exit_apps_notify; |
cf3af59e | 6314 | } |
fac6795d | 6315 | |
022d91ba | 6316 | /* Create agent registration thread. */ |
1a1a34b4 | 6317 | ret = pthread_create(&agent_reg_thread, default_pthread_attr(), |
022d91ba | 6318 | agent_thread_manage_registration, (void *) NULL); |
4a15001e MD |
6319 | if (ret) { |
6320 | errno = ret; | |
022d91ba | 6321 | PERROR("pthread_create agent"); |
4a15001e | 6322 | retval = -1; |
b3530820 | 6323 | stop_threads(); |
022d91ba | 6324 | goto exit_agent_reg; |
4d076222 DG |
6325 | } |
6326 | ||
6620da75 | 6327 | /* Don't start this thread if kernel tracing is not requested nor root */ |
e6142f2e | 6328 | if (is_root && !config.no_kernel) { |
6620da75 | 6329 | /* Create kernel thread to manage kernel event */ |
1a1a34b4 | 6330 | ret = pthread_create(&kernel_thread, default_pthread_attr(), |
6620da75 | 6331 | thread_manage_kernel, (void *) NULL); |
4a15001e MD |
6332 | if (ret) { |
6333 | errno = ret; | |
6620da75 | 6334 | PERROR("pthread_create kernel"); |
4a15001e | 6335 | retval = -1; |
b3530820 | 6336 | stop_threads(); |
6620da75 DG |
6337 | goto exit_kernel; |
6338 | } | |
ef367a93 | 6339 | } |
7a485870 | 6340 | |
4a15001e | 6341 | /* Create session loading thread. */ |
1a1a34b4 MJ |
6342 | ret = pthread_create(&load_session_thread, default_pthread_attr(), |
6343 | thread_load_session, load_info); | |
4a15001e MD |
6344 | if (ret) { |
6345 | errno = ret; | |
6346 | PERROR("pthread_create load_session_thread"); | |
6347 | retval = -1; | |
b3530820 | 6348 | stop_threads(); |
4a15001e MD |
6349 | goto exit_load_session; |
6350 | } | |
6351 | ||
6352 | /* | |
6353 | * This is where we start awaiting program completion (e.g. through | |
6354 | * signal that asks threads to teardown). | |
6355 | */ | |
6356 | ||
6357 | ret = pthread_join(load_session_thread, &status); | |
6358 | if (ret) { | |
6359 | errno = ret; | |
6360 | PERROR("pthread_join load_session_thread"); | |
6361 | retval = -1; | |
6362 | } | |
6363 | exit_load_session: | |
ef367a93 | 6364 | |
e6142f2e | 6365 | if (is_root && !config.no_kernel) { |
6620da75 | 6366 | ret = pthread_join(kernel_thread, &status); |
4a15001e MD |
6367 | if (ret) { |
6368 | errno = ret; | |
6620da75 | 6369 | PERROR("pthread_join"); |
4a15001e | 6370 | retval = -1; |
6620da75 | 6371 | } |
fac6795d | 6372 | } |
cf3af59e | 6373 | exit_kernel: |
4a15001e | 6374 | |
022d91ba | 6375 | ret = pthread_join(agent_reg_thread, &status); |
4a15001e MD |
6376 | if (ret) { |
6377 | errno = ret; | |
022d91ba | 6378 | PERROR("pthread_join agent"); |
4a15001e | 6379 | retval = -1; |
4d076222 | 6380 | } |
022d91ba | 6381 | exit_agent_reg: |
4a15001e | 6382 | |
9563b0ad | 6383 | ret = pthread_join(apps_notify_thread, &status); |
4a15001e MD |
6384 | if (ret) { |
6385 | errno = ret; | |
9563b0ad | 6386 | PERROR("pthread_join apps notify"); |
4a15001e | 6387 | retval = -1; |
9563b0ad | 6388 | } |
9563b0ad | 6389 | exit_apps_notify: |
4a15001e | 6390 | |
cf3af59e | 6391 | ret = pthread_join(apps_thread, &status); |
4a15001e MD |
6392 | if (ret) { |
6393 | errno = ret; | |
9563b0ad | 6394 | PERROR("pthread_join apps"); |
4a15001e | 6395 | retval = -1; |
cf3af59e | 6396 | } |
cf3af59e | 6397 | exit_apps: |
4a15001e | 6398 | |
099e26bd | 6399 | ret = pthread_join(reg_apps_thread, &status); |
4a15001e MD |
6400 | if (ret) { |
6401 | errno = ret; | |
76d7553f | 6402 | PERROR("pthread_join"); |
4a15001e | 6403 | retval = -1; |
099e26bd | 6404 | } |
099e26bd | 6405 | exit_reg_apps: |
4a15001e | 6406 | |
772b8f4d MD |
6407 | /* |
6408 | * Join dispatch thread after joining reg_apps_thread to ensure | |
6409 | * we don't leak applications in the queue. | |
6410 | */ | |
099e26bd | 6411 | ret = pthread_join(dispatch_thread, &status); |
4a15001e MD |
6412 | if (ret) { |
6413 | errno = ret; | |
76d7553f | 6414 | PERROR("pthread_join"); |
4a15001e | 6415 | retval = -1; |
099e26bd | 6416 | } |
099e26bd | 6417 | exit_dispatch: |
4a15001e | 6418 | |
cf3af59e | 6419 | ret = pthread_join(client_thread, &status); |
4a15001e MD |
6420 | if (ret) { |
6421 | errno = ret; | |
76d7553f | 6422 | PERROR("pthread_join"); |
4a15001e | 6423 | retval = -1; |
cf3af59e | 6424 | } |
a88df331 | 6425 | |
b3530820 | 6426 | exit_client: |
db66e574 | 6427 | exit_rotation: |
b3530820 | 6428 | exit_notification: |
90936dcf | 6429 | sem_destroy(¬ification_thread_ready); |
4a15001e MD |
6430 | ret = pthread_join(health_thread, &status); |
6431 | if (ret) { | |
6432 | errno = ret; | |
6433 | PERROR("pthread_join health thread"); | |
6434 | retval = -1; | |
06f525de DG |
6435 | } |
6436 | ||
b3530820 | 6437 | exit_health: |
4a15001e | 6438 | exit_init_data: |
4d62fbf8 MD |
6439 | /* |
6440 | * Wait for all pending call_rcu work to complete before tearing | |
6441 | * down data structures. call_rcu worker may be trying to | |
6442 | * perform lookups in those structures. | |
6443 | */ | |
6444 | rcu_barrier(); | |
4a15001e MD |
6445 | /* |
6446 | * sessiond_cleanup() is called when no other thread is running, except | |
6447 | * the ht_cleanup thread, which is needed to destroy the hash tables. | |
6448 | */ | |
6449 | rcu_thread_online(); | |
6450 | sessiond_cleanup(); | |
06f525de | 6451 | |
c4d5de9d JG |
6452 | /* |
6453 | * Ensure all prior call_rcu are done. call_rcu callbacks may push | |
6454 | * hash tables to the ht_cleanup thread. Therefore, we ensure that | |
6455 | * the queue is empty before shutting down the clean-up thread. | |
6456 | */ | |
6457 | rcu_barrier(); | |
6458 | ||
b3530820 JG |
6459 | /* |
6460 | * The teardown of the notification system is performed after the | |
6461 | * session daemon's teardown in order to allow it to be notified | |
6462 | * of the active session and channels at the moment of the teardown. | |
6463 | */ | |
6464 | if (notification_thread_handle) { | |
99611076 | 6465 | if (notification_thread_launched) { |
6be1a386 JG |
6466 | notification_thread_command_quit( |
6467 | notification_thread_handle); | |
6468 | ret = pthread_join(notification_thread, &status); | |
6469 | if (ret) { | |
6470 | errno = ret; | |
6471 | PERROR("pthread_join notification thread"); | |
6472 | retval = -1; | |
6473 | } | |
3dec304b | 6474 | } |
6be1a386 | 6475 | notification_thread_handle_destroy(notification_thread_handle); |
b3530820 JG |
6476 | } |
6477 | ||
db66e574 | 6478 | if (rotation_thread_handle) { |
99611076 | 6479 | if (rotation_thread_launched) { |
db66e574 JD |
6480 | ret = pthread_join(rotation_thread, &status); |
6481 | if (ret) { | |
6482 | errno = ret; | |
6483 | PERROR("pthread_join rotation thread"); | |
6484 | retval = -1; | |
6485 | } | |
6486 | } | |
6487 | rotation_thread_handle_destroy(rotation_thread_handle); | |
6488 | } | |
6489 | ||
99611076 | 6490 | if (timer_thread_launched) { |
92816cc3 | 6491 | timer_exit(); |
d086f507 JD |
6492 | ret = pthread_join(timer_thread, &status); |
6493 | if (ret) { | |
6494 | errno = ret; | |
6495 | PERROR("pthread_join timer thread"); | |
6496 | retval = -1; | |
6497 | } | |
6498 | } | |
6499 | ||
6500 | /* | |
6501 | * After the rotation and timer thread have quit, we can safely destroy | |
6502 | * the rotation_timer_queue. | |
6503 | */ | |
92816cc3 | 6504 | rotation_thread_timer_queue_destroy(rotation_timer_queue); |
d086f507 | 6505 | |
b3530820 JG |
6506 | rcu_thread_offline(); |
6507 | rcu_unregister_thread(); | |
6508 | ||
5e97de00 | 6509 | ret = fini_ht_cleanup_thread(&ht_cleanup_thread); |
4a15001e | 6510 | if (ret) { |
4a15001e | 6511 | retval = -1; |
0b2dc8df | 6512 | } |
b3530820 JG |
6513 | lttng_pipe_destroy(ust32_channel_monitor_pipe); |
6514 | lttng_pipe_destroy(ust64_channel_monitor_pipe); | |
6515 | lttng_pipe_destroy(kernel_channel_monitor_pipe); | |
0b2dc8df | 6516 | exit_ht_cleanup: |
4a15001e | 6517 | |
4a15001e MD |
6518 | health_app_destroy(health_sessiond); |
6519 | exit_health_sessiond_cleanup: | |
7567352f | 6520 | exit_create_run_as_worker_cleanup: |
4a15001e MD |
6521 | |
6522 | exit_options: | |
f472090a | 6523 | sessiond_cleanup_lock_file(); |
4a15001e MD |
6524 | sessiond_cleanup_options(); |
6525 | ||
6526 | exit_set_signal_handler: | |
6527 | if (!retval) { | |
cf3af59e | 6528 | exit(EXIT_SUCCESS); |
4a15001e MD |
6529 | } else { |
6530 | exit(EXIT_FAILURE); | |
67e40797 | 6531 | } |
fac6795d | 6532 | } |