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 | ||
20 | #define _GNU_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> |
3bd1e081 | 40 | #include <config.h> |
fac6795d | 41 | |
990570ed | 42 | #include <common/common.h> |
d27c42b8 | 43 | #include <common/compat/socket.h> |
db758600 DG |
44 | #include <common/defaults.h> |
45 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 46 | #include <common/futex.h> |
00e2e675 | 47 | #include <common/relayd/relayd.h> |
81b86775 | 48 | #include <common/utils.h> |
26296c48 | 49 | #include <common/config/config.h> |
fac6795d | 50 | |
10a8a223 | 51 | #include "lttng-sessiond.h" |
7972aab2 | 52 | #include "buffer-registry.h" |
54d01ffb | 53 | #include "channel.h" |
2f77fc4b | 54 | #include "cmd.h" |
00e2e675 | 55 | #include "consumer.h" |
099e26bd | 56 | #include "context.h" |
54d01ffb | 57 | #include "event.h" |
4771f025 | 58 | #include "kernel.h" |
f1e16794 | 59 | #include "kernel-consumer.h" |
096102bd | 60 | #include "modprobe.h" |
0fdd1e2c | 61 | #include "shm.h" |
1e307fab | 62 | #include "ust-ctl.h" |
00e2e675 | 63 | #include "ust-consumer.h" |
8e68d1c8 | 64 | #include "utils.h" |
4063050c | 65 | #include "fd-limit.h" |
8782cc74 | 66 | #include "health-sessiond.h" |
8ac94142 | 67 | #include "testpoint.h" |
d0b96690 | 68 | #include "ust-thread.h" |
4d076222 | 69 | #include "jul-thread.h" |
fac6795d | 70 | |
ebaeda94 MD |
71 | #define CONSUMERD_FILE "lttng-consumerd" |
72 | ||
fac6795d | 73 | const char *progname; |
6c71277b | 74 | static const char *tracing_group_name = DEFAULT_TRACING_GROUP; |
26296c48 JG |
75 | static int tracing_group_name_override; |
76 | static char *opt_pidfile; | |
5b8719f5 | 77 | static int opt_sig_parent; |
97e19046 | 78 | static int opt_verbose_consumer; |
fac6795d | 79 | static int opt_daemon; |
4fba7219 | 80 | static int opt_no_kernel; |
fac6795d | 81 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 82 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
0bb7724a | 83 | static pid_t child_ppid; /* Internal parent PID use with daemonize. */ |
67e40797 | 84 | static char *rundir; |
3bd1e081 | 85 | |
0bb7724a DG |
86 | /* Set to 1 when a SIGUSR1 signal is received. */ |
87 | static int recv_child_signal; | |
88 | ||
a23ec3a7 DG |
89 | /* |
90 | * Consumer daemon specific control data. Every value not initialized here is | |
91 | * set to 0 by the static definition. | |
92 | */ | |
3bd1e081 MD |
93 | static struct consumer_data kconsumer_data = { |
94 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
95 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
96 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
97 | .err_sock = -1, |
98 | .cmd_sock = -1, | |
173af62f DG |
99 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
100 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
101 | .cond = PTHREAD_COND_INITIALIZER, |
102 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 103 | }; |
7753dea8 MD |
104 | static struct consumer_data ustconsumer64_data = { |
105 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
106 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
107 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
108 | .err_sock = -1, |
109 | .cmd_sock = -1, | |
173af62f DG |
110 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
111 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
112 | .cond = PTHREAD_COND_INITIALIZER, |
113 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
114 | }; |
115 | static struct consumer_data ustconsumer32_data = { | |
116 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
117 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
118 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
119 | .err_sock = -1, |
120 | .cmd_sock = -1, | |
173af62f DG |
121 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
122 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
123 | .cond = PTHREAD_COND_INITIALIZER, |
124 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
125 | }; |
126 | ||
26296c48 JG |
127 | /* Command line options */ |
128 | static const struct option long_options[] = { | |
129 | { "client-sock", 1, 0, 'c' }, | |
130 | { "apps-sock", 1, 0, 'a' }, | |
131 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, | |
132 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
133 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, | |
134 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
135 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, | |
136 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
137 | { "consumerd32-path", 1, 0, 'u' }, | |
138 | { "consumerd32-libdir", 1, 0, 'U' }, | |
139 | { "consumerd64-path", 1, 0, 't' }, | |
140 | { "consumerd64-libdir", 1, 0, 'T' }, | |
141 | { "daemonize", 0, 0, 'd' }, | |
142 | { "sig-parent", 0, 0, 'S' }, | |
143 | { "help", 0, 0, 'h' }, | |
144 | { "group", 1, 0, 'g' }, | |
145 | { "version", 0, 0, 'V' }, | |
146 | { "quiet", 0, 0, 'q' }, | |
147 | { "verbose", 0, 0, 'v' }, | |
148 | { "verbose-consumer", 0, 0, 'Z' }, | |
149 | { "no-kernel", 0, 0, 'N' }, | |
150 | { "pidfile", 1, 0, 'p' }, | |
151 | { "jul-tcp-port", 1, 0, 'J' }, | |
152 | { "config", 1, 0, 'f' }, | |
153 | { NULL, 0, 0, 0 } | |
154 | }; | |
155 | ||
156 | /* Command line options to ignore from configuration file */ | |
157 | static const char *config_ignore_options[] = { "help", "version", "config" }; | |
158 | ||
26c9d55e | 159 | /* Shared between threads */ |
099e26bd | 160 | static int dispatch_thread_exit; |
fac6795d | 161 | |
54d01ffb DG |
162 | /* Global application Unix socket path */ |
163 | static char apps_unix_sock_path[PATH_MAX]; | |
164 | /* Global client Unix socket path */ | |
165 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
166 | /* global wait shm path for UST */ |
167 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
168 | /* Global health check unix path */ |
169 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 170 | |
1d4b027a | 171 | /* Sockets and FDs */ |
a4b35e07 MD |
172 | static int client_sock = -1; |
173 | static int apps_sock = -1; | |
2f77fc4b | 174 | int kernel_tracer_fd = -1; |
76d7553f | 175 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 176 | |
273ea72c DG |
177 | /* |
178 | * Quit pipe for all threads. This permits a single cancellation point | |
179 | * for all threads when receiving an event on the pipe. | |
180 | */ | |
76d7553f | 181 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 182 | |
099e26bd DG |
183 | /* |
184 | * This pipe is used to inform the thread managing application communication | |
185 | * that a command is queued and ready to be processed. | |
186 | */ | |
76d7553f | 187 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 188 | |
d0b96690 DG |
189 | int apps_cmd_notify_pipe[2] = { -1, -1 }; |
190 | ||
1d4b027a | 191 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 192 | static pthread_t apps_thread; |
d0b96690 | 193 | static pthread_t apps_notify_thread; |
099e26bd | 194 | static pthread_t reg_apps_thread; |
1d4b027a | 195 | static pthread_t client_thread; |
7a485870 | 196 | static pthread_t kernel_thread; |
099e26bd | 197 | static pthread_t dispatch_thread; |
44a5e5eb | 198 | static pthread_t health_thread; |
0b2dc8df | 199 | static pthread_t ht_cleanup_thread; |
4d076222 | 200 | static pthread_t jul_reg_thread; |
5eb91c98 | 201 | |
099e26bd DG |
202 | /* |
203 | * UST registration command queue. This queue is tied with a futex and uses a N | |
204 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
205 | * | |
206 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
207 | * this queue and the wait/wake scheme. | |
208 | */ | |
209 | static struct ust_cmd_queue ust_cmd_queue; | |
210 | ||
b5541356 DG |
211 | /* |
212 | * Pointer initialized before thread creation. | |
213 | * | |
214 | * This points to the tracing session list containing the session count and a | |
215 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
216 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 217 | * |
d063d709 | 218 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 219 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
220 | */ |
221 | static struct ltt_session_list *session_list_ptr; | |
222 | ||
7753dea8 MD |
223 | int ust_consumerd64_fd = -1; |
224 | int ust_consumerd32_fd = -1; | |
225 | ||
fb6f1fa2 YB |
226 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
227 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
228 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
229 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
26296c48 JG |
230 | static int consumerd32_bin_override; |
231 | static int consumerd64_bin_override; | |
232 | static int consumerd32_libdir_override; | |
233 | static int consumerd64_libdir_override; | |
fb09408a | 234 | |
2f77fc4b DG |
235 | static const char *module_proc_lttng = "/proc/lttng"; |
236 | ||
5c827ce0 DG |
237 | /* |
238 | * Consumer daemon state which is changed when spawning it, killing it or in | |
239 | * case of a fatal error. | |
240 | */ | |
241 | enum consumerd_state { | |
242 | CONSUMER_STARTED = 1, | |
243 | CONSUMER_STOPPED = 2, | |
244 | CONSUMER_ERROR = 3, | |
245 | }; | |
246 | ||
247 | /* | |
248 | * This consumer daemon state is used to validate if a client command will be | |
249 | * able to reach the consumer. If not, the client is informed. For instance, | |
250 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
251 | * error to the client. | |
252 | * | |
253 | * The following example shows a possible race condition of this scheme: | |
254 | * | |
255 | * consumer thread error happens | |
256 | * client cmd arrives | |
257 | * client cmd checks state -> still OK | |
258 | * consumer thread exit, sets error | |
259 | * client cmd try to talk to consumer | |
260 | * ... | |
261 | * | |
262 | * However, since the consumer is a different daemon, we have no way of making | |
263 | * sure the command will reach it safely even with this state flag. This is why | |
264 | * we consider that up to the state validation during command processing, the | |
265 | * command is safe. After that, we can not guarantee the correctness of the | |
266 | * client request vis-a-vis the consumer. | |
267 | */ | |
268 | static enum consumerd_state ust_consumerd_state; | |
269 | static enum consumerd_state kernel_consumerd_state; | |
270 | ||
ae9e45b3 DG |
271 | /* |
272 | * Socket timeout for receiving and sending in seconds. | |
273 | */ | |
274 | static int app_socket_timeout; | |
275 | ||
12744796 DG |
276 | /* Set in main() with the current page size. */ |
277 | long page_size; | |
278 | ||
8782cc74 MD |
279 | /* Application health monitoring */ |
280 | struct health_app *health_sessiond; | |
281 | ||
4d076222 DG |
282 | /* JUL TCP port for registration. Used by the JUL thread. */ |
283 | unsigned int jul_tcp_port = DEFAULT_JUL_TCP_PORT; | |
284 | ||
26296c48 JG |
285 | const char * const config_section_name = "sessiond"; |
286 | ||
97bc1426 MD |
287 | /* |
288 | * Whether sessiond is ready for commands/health check requests. | |
289 | * NR_LTTNG_SESSIOND_READY must match the number of calls to | |
290 | * lttng_sessiond_notify_ready(). | |
291 | */ | |
292 | #define NR_LTTNG_SESSIOND_READY 2 | |
293 | int lttng_sessiond_ready = NR_LTTNG_SESSIOND_READY; | |
294 | ||
295 | /* Notify parents that we are ready for cmd and health check */ | |
296 | static | |
297 | void lttng_sessiond_notify_ready(void) | |
298 | { | |
299 | if (uatomic_sub_return(<tng_sessiond_ready, 1) == 0) { | |
300 | /* | |
301 | * Notify parent pid that we are ready to accept command | |
302 | * for client side. This ppid is the one from the | |
303 | * external process that spawned us. | |
304 | */ | |
305 | if (opt_sig_parent) { | |
306 | kill(ppid, SIGUSR1); | |
307 | } | |
308 | ||
309 | /* | |
310 | * Notify the parent of the fork() process that we are | |
311 | * ready. | |
312 | */ | |
313 | if (opt_daemon) { | |
314 | kill(child_ppid, SIGUSR1); | |
315 | } | |
316 | } | |
317 | } | |
318 | ||
fb09408a | 319 | static |
7753dea8 | 320 | void setup_consumerd_path(void) |
fb09408a | 321 | { |
fc7a59ce | 322 | const char *bin, *libdir; |
fb09408a | 323 | |
7753dea8 MD |
324 | /* |
325 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
326 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
327 | * has not been defined. | |
7753dea8 | 328 | */ |
ebaeda94 | 329 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
330 | if (!consumerd32_bin[0]) { |
331 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
332 | } |
333 | if (!consumerd32_libdir[0]) { | |
334 | consumerd32_libdir = INSTALL_LIB_PATH; | |
335 | } | |
336 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
337 | if (!consumerd64_bin[0]) { |
338 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 339 | } |
ebaeda94 MD |
340 | if (!consumerd64_libdir[0]) { |
341 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
342 | } |
343 | #else | |
344 | #error "Unknown bitness" | |
345 | #endif | |
346 | ||
fb09408a MD |
347 | /* |
348 | * runtime env. var. overrides the build default. | |
349 | */ | |
fc7a59ce AM |
350 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
351 | if (bin) { | |
352 | consumerd32_bin = bin; | |
7753dea8 | 353 | } |
fc7a59ce AM |
354 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
355 | if (bin) { | |
356 | consumerd64_bin = bin; | |
ebaeda94 | 357 | } |
72f579ee | 358 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
359 | if (libdir) { |
360 | consumerd32_libdir = libdir; | |
361 | } | |
72f579ee | 362 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
363 | if (libdir) { |
364 | consumerd64_libdir = libdir; | |
fb09408a MD |
365 | } |
366 | } | |
367 | ||
5eb91c98 DG |
368 | /* |
369 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
370 | */ | |
d0b96690 | 371 | int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size) |
5eb91c98 DG |
372 | { |
373 | int ret; | |
374 | ||
d0b96690 | 375 | assert(events); |
5eb91c98 DG |
376 | |
377 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
378 | if (ret < 0) { | |
379 | goto error; | |
380 | } | |
381 | ||
382 | /* Add quit pipe */ | |
d0b96690 | 383 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
5eb91c98 DG |
384 | if (ret < 0) { |
385 | goto error; | |
386 | } | |
387 | ||
388 | return 0; | |
389 | ||
390 | error: | |
391 | return ret; | |
392 | } | |
393 | ||
394 | /* | |
395 | * Check if the thread quit pipe was triggered. | |
396 | * | |
397 | * Return 1 if it was triggered else 0; | |
398 | */ | |
d0b96690 | 399 | int sessiond_check_thread_quit_pipe(int fd, uint32_t events) |
5eb91c98 DG |
400 | { |
401 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
402 | return 1; | |
403 | } | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
273ea72c | 408 | /* |
5eb91c98 | 409 | * Init thread quit pipe. |
273ea72c DG |
410 | * |
411 | * Return -1 on error or 0 if all pipes are created. | |
412 | */ | |
413 | static int init_thread_quit_pipe(void) | |
414 | { | |
730389d9 | 415 | int ret, i; |
273ea72c | 416 | |
730389d9 | 417 | ret = pipe(thread_quit_pipe); |
273ea72c | 418 | if (ret < 0) { |
730389d9 | 419 | PERROR("thread quit pipe"); |
273ea72c DG |
420 | goto error; |
421 | } | |
422 | ||
730389d9 DG |
423 | for (i = 0; i < 2; i++) { |
424 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
425 | if (ret < 0) { | |
426 | PERROR("fcntl"); | |
427 | goto error; | |
428 | } | |
429 | } | |
430 | ||
273ea72c DG |
431 | error: |
432 | return ret; | |
433 | } | |
434 | ||
099e26bd DG |
435 | /* |
436 | * Stop all threads by closing the thread quit pipe. | |
437 | */ | |
cf3af59e MD |
438 | static void stop_threads(void) |
439 | { | |
5eb91c98 DG |
440 | int ret; |
441 | ||
cf3af59e MD |
442 | /* Stopping all threads */ |
443 | DBG("Terminating all threads"); | |
54d01ffb | 444 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
445 | if (ret < 0) { |
446 | ERR("write error on thread quit pipe"); | |
447 | } | |
448 | ||
099e26bd | 449 | /* Dispatch thread */ |
26c9d55e | 450 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 451 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
452 | } |
453 | ||
e975f9f8 DG |
454 | /* |
455 | * Close every consumer sockets. | |
456 | */ | |
457 | static void close_consumer_sockets(void) | |
458 | { | |
459 | int ret; | |
460 | ||
461 | if (kconsumer_data.err_sock >= 0) { | |
462 | ret = close(kconsumer_data.err_sock); | |
463 | if (ret < 0) { | |
464 | PERROR("kernel consumer err_sock close"); | |
465 | } | |
466 | } | |
467 | if (ustconsumer32_data.err_sock >= 0) { | |
468 | ret = close(ustconsumer32_data.err_sock); | |
469 | if (ret < 0) { | |
a76cbd9f | 470 | PERROR("UST consumerd32 err_sock close"); |
e975f9f8 DG |
471 | } |
472 | } | |
473 | if (ustconsumer64_data.err_sock >= 0) { | |
474 | ret = close(ustconsumer64_data.err_sock); | |
475 | if (ret < 0) { | |
a76cbd9f | 476 | PERROR("UST consumerd64 err_sock close"); |
e975f9f8 DG |
477 | } |
478 | } | |
479 | if (kconsumer_data.cmd_sock >= 0) { | |
480 | ret = close(kconsumer_data.cmd_sock); | |
481 | if (ret < 0) { | |
482 | PERROR("kernel consumer cmd_sock close"); | |
483 | } | |
484 | } | |
485 | if (ustconsumer32_data.cmd_sock >= 0) { | |
486 | ret = close(ustconsumer32_data.cmd_sock); | |
487 | if (ret < 0) { | |
a76cbd9f | 488 | PERROR("UST consumerd32 cmd_sock close"); |
e975f9f8 DG |
489 | } |
490 | } | |
491 | if (ustconsumer64_data.cmd_sock >= 0) { | |
492 | ret = close(ustconsumer64_data.cmd_sock); | |
493 | if (ret < 0) { | |
a76cbd9f | 494 | PERROR("UST consumerd64 cmd_sock close"); |
e975f9f8 DG |
495 | } |
496 | } | |
497 | } | |
498 | ||
fac6795d | 499 | /* |
d063d709 | 500 | * Cleanup the daemon |
fac6795d | 501 | */ |
cf3af59e | 502 | static void cleanup(void) |
fac6795d | 503 | { |
ef599319 | 504 | int ret; |
af9737e9 | 505 | struct ltt_session *sess, *stmp; |
8c6c56c2 | 506 | char path[PATH_MAX]; |
fac6795d | 507 | |
1d4b027a | 508 | DBG("Cleaning up"); |
e07ae692 | 509 | |
4e449f3f MD |
510 | /* |
511 | * Close the thread quit pipe. It has already done its job, | |
512 | * since we are now called. | |
513 | */ | |
2f77fc4b DG |
514 | utils_close_pipe(thread_quit_pipe); |
515 | ||
35f90c40 DG |
516 | /* |
517 | * If opt_pidfile is undefined, the default file will be wiped when | |
518 | * removing the rundir. | |
519 | */ | |
520 | if (opt_pidfile) { | |
521 | ret = remove(opt_pidfile); | |
522 | if (ret < 0) { | |
523 | PERROR("remove pidfile %s", opt_pidfile); | |
524 | } | |
525 | } | |
526 | ||
8c6c56c2 MD |
527 | DBG("Removing sessiond and consumerd content of directory %s", rundir); |
528 | ||
529 | /* sessiond */ | |
530 | snprintf(path, PATH_MAX, | |
531 | "%s/%s", | |
532 | rundir, DEFAULT_LTTNG_SESSIOND_PIDFILE); | |
533 | DBG("Removing %s", path); | |
534 | (void) unlink(path); | |
535 | ||
cd9290dd DG |
536 | snprintf(path, PATH_MAX, "%s/%s", rundir, |
537 | DEFAULT_LTTNG_SESSIOND_JULPORT_FILE); | |
538 | DBG("Removing %s", path); | |
539 | (void) unlink(path); | |
540 | ||
8c6c56c2 MD |
541 | /* kconsumerd */ |
542 | snprintf(path, PATH_MAX, | |
543 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, | |
544 | rundir); | |
545 | DBG("Removing %s", path); | |
546 | (void) unlink(path); | |
547 | ||
548 | snprintf(path, PATH_MAX, | |
549 | DEFAULT_KCONSUMERD_PATH, | |
550 | rundir); | |
551 | DBG("Removing directory %s", path); | |
552 | (void) rmdir(path); | |
553 | ||
554 | /* ust consumerd 32 */ | |
555 | snprintf(path, PATH_MAX, | |
556 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, | |
557 | rundir); | |
558 | DBG("Removing %s", path); | |
559 | (void) unlink(path); | |
560 | ||
561 | snprintf(path, PATH_MAX, | |
562 | DEFAULT_USTCONSUMERD32_PATH, | |
563 | rundir); | |
564 | DBG("Removing directory %s", path); | |
565 | (void) rmdir(path); | |
566 | ||
567 | /* ust consumerd 64 */ | |
568 | snprintf(path, PATH_MAX, | |
569 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, | |
570 | rundir); | |
571 | DBG("Removing %s", path); | |
572 | (void) unlink(path); | |
573 | ||
574 | snprintf(path, PATH_MAX, | |
575 | DEFAULT_USTCONSUMERD64_PATH, | |
576 | rundir); | |
577 | DBG("Removing directory %s", path); | |
578 | (void) rmdir(path); | |
5461b305 | 579 | |
dcbcae3e MD |
580 | /* |
581 | * We do NOT rmdir rundir because there are other processes | |
582 | * using it, for instance lttng-relayd, which can start in | |
583 | * parallel with this teardown. | |
584 | */ | |
585 | ||
bd69add2 | 586 | free(rundir); |
5461b305 | 587 | |
99bab54f | 588 | DBG("Cleaning up all sessions"); |
fac6795d | 589 | |
b5541356 | 590 | /* Destroy session list mutex */ |
273ea72c DG |
591 | if (session_list_ptr != NULL) { |
592 | pthread_mutex_destroy(&session_list_ptr->lock); | |
593 | ||
594 | /* Cleanup ALL session */ | |
54d01ffb DG |
595 | cds_list_for_each_entry_safe(sess, stmp, |
596 | &session_list_ptr->head, list) { | |
2f77fc4b | 597 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
598 | } |
599 | } | |
600 | ||
099e26bd | 601 | DBG("Closing all UST sockets"); |
56fff090 | 602 | ust_app_clean_list(); |
7972aab2 | 603 | buffer_reg_destroy_registries(); |
099e26bd | 604 | |
4fba7219 DG |
605 | if (is_root && !opt_no_kernel) { |
606 | DBG2("Closing kernel fd"); | |
a4b35e07 | 607 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
608 | ret = close(kernel_tracer_fd); |
609 | if (ret) { | |
610 | PERROR("close"); | |
611 | } | |
a4b35e07 | 612 | } |
2f50c8a3 | 613 | DBG("Unloading kernel modules"); |
096102bd | 614 | modprobe_remove_lttng_all(); |
2f50c8a3 | 615 | } |
2f77fc4b | 616 | |
e975f9f8 DG |
617 | close_consumer_sockets(); |
618 | ||
26296c48 JG |
619 | /* |
620 | * If the override option is set, the pointer points to a *non* const thus | |
621 | * freeing it even though the variable type is set to const. | |
622 | */ | |
623 | if (tracing_group_name_override) { | |
624 | free((void *) tracing_group_name); | |
625 | } | |
626 | if (consumerd32_bin_override) { | |
627 | free((void *) consumerd32_bin); | |
628 | } | |
629 | if (consumerd64_bin_override) { | |
630 | free((void *) consumerd64_bin); | |
631 | } | |
632 | if (consumerd32_libdir_override) { | |
633 | free((void *) consumerd32_libdir); | |
634 | } | |
635 | if (consumerd64_libdir_override) { | |
636 | free((void *) consumerd64_libdir); | |
637 | } | |
638 | ||
639 | if (opt_pidfile) { | |
640 | free(opt_pidfile); | |
641 | } | |
642 | ||
421cb601 | 643 | /* <fun> */ |
f56a39af | 644 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
645 | "Matthew, BEET driven development works!%c[%dm", |
646 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
647 | /* </fun> */ | |
fac6795d DG |
648 | } |
649 | ||
e065084a | 650 | /* |
d063d709 | 651 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 652 | * |
d063d709 | 653 | * Return lttcomm error code. |
e065084a DG |
654 | */ |
655 | static int send_unix_sock(int sock, void *buf, size_t len) | |
656 | { | |
657 | /* Check valid length */ | |
c617c0c6 | 658 | if (len == 0) { |
e065084a DG |
659 | return -1; |
660 | } | |
661 | ||
662 | return lttcomm_send_unix_sock(sock, buf, len); | |
663 | } | |
664 | ||
5461b305 | 665 | /* |
d063d709 | 666 | * Free memory of a command context structure. |
5461b305 | 667 | */ |
a2fb29a5 | 668 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 669 | { |
a2fb29a5 DG |
670 | DBG("Clean command context structure"); |
671 | if (*cmd_ctx) { | |
672 | if ((*cmd_ctx)->llm) { | |
673 | free((*cmd_ctx)->llm); | |
5461b305 | 674 | } |
a2fb29a5 DG |
675 | if ((*cmd_ctx)->lsm) { |
676 | free((*cmd_ctx)->lsm); | |
5461b305 | 677 | } |
a2fb29a5 DG |
678 | free(*cmd_ctx); |
679 | *cmd_ctx = NULL; | |
5461b305 DG |
680 | } |
681 | } | |
682 | ||
fac6795d | 683 | /* |
0fdd1e2c | 684 | * Notify UST applications using the shm mmap futex. |
fac6795d | 685 | */ |
0fdd1e2c | 686 | static int notify_ust_apps(int active) |
fac6795d | 687 | { |
0fdd1e2c | 688 | char *wait_shm_mmap; |
fac6795d | 689 | |
0fdd1e2c | 690 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 691 | |
0fdd1e2c DG |
692 | /* See shm.c for this call implying mmap, shm and futex calls */ |
693 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
694 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
695 | goto error; |
696 | } | |
697 | ||
0fdd1e2c DG |
698 | /* Wake waiting process */ |
699 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
700 | ||
701 | /* Apps notified successfully */ | |
702 | return 0; | |
fac6795d DG |
703 | |
704 | error: | |
0fdd1e2c | 705 | return -1; |
fac6795d DG |
706 | } |
707 | ||
e065084a | 708 | /* |
d063d709 DG |
709 | * Setup the outgoing data buffer for the response (llm) by allocating the |
710 | * right amount of memory and copying the original information from the lsm | |
711 | * structure. | |
ca95a216 | 712 | * |
d063d709 | 713 | * Return total size of the buffer pointed by buf. |
ca95a216 | 714 | */ |
5461b305 | 715 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 716 | { |
f3ed775e | 717 | int ret, buf_size; |
ca95a216 | 718 | |
f3ed775e | 719 | buf_size = size; |
5461b305 | 720 | |
ba7f0ae5 | 721 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 722 | if (cmd_ctx->llm == NULL) { |
76d7553f | 723 | PERROR("zmalloc"); |
5461b305 | 724 | ret = -ENOMEM; |
ca95a216 DG |
725 | goto error; |
726 | } | |
727 | ||
5461b305 DG |
728 | /* Copy common data */ |
729 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 730 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 731 | |
5461b305 DG |
732 | cmd_ctx->llm->data_size = size; |
733 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
734 | ||
ca95a216 DG |
735 | return buf_size; |
736 | ||
737 | error: | |
738 | return ret; | |
739 | } | |
740 | ||
7a485870 | 741 | /* |
5eb91c98 | 742 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 743 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 744 | */ |
5eb91c98 | 745 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 746 | { |
5eb91c98 | 747 | int ret; |
7a485870 DG |
748 | struct ltt_session *session; |
749 | struct ltt_kernel_channel *channel; | |
750 | ||
5eb91c98 | 751 | DBG("Updating kernel poll set"); |
7a485870 | 752 | |
54d01ffb | 753 | session_lock_list(); |
b5541356 | 754 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 755 | session_lock(session); |
7a485870 | 756 | if (session->kernel_session == NULL) { |
54d01ffb | 757 | session_unlock(session); |
7a485870 DG |
758 | continue; |
759 | } | |
7a485870 | 760 | |
54d01ffb DG |
761 | cds_list_for_each_entry(channel, |
762 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
763 | /* Add channel fd to the kernel poll set */ |
764 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
765 | if (ret < 0) { | |
54d01ffb | 766 | session_unlock(session); |
5eb91c98 DG |
767 | goto error; |
768 | } | |
769 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 770 | } |
54d01ffb | 771 | session_unlock(session); |
7a485870 | 772 | } |
54d01ffb | 773 | session_unlock_list(); |
7a485870 | 774 | |
5eb91c98 | 775 | return 0; |
7a485870 DG |
776 | |
777 | error: | |
54d01ffb | 778 | session_unlock_list(); |
7a485870 DG |
779 | return -1; |
780 | } | |
781 | ||
782 | /* | |
54d01ffb | 783 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 784 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 785 | * |
d063d709 | 786 | * Useful for CPU hotplug feature. |
7a485870 | 787 | */ |
2bdd86d4 | 788 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
789 | { |
790 | int ret = 0; | |
791 | struct ltt_session *session; | |
173af62f | 792 | struct ltt_kernel_session *ksess; |
7a485870 DG |
793 | struct ltt_kernel_channel *channel; |
794 | ||
795 | DBG("Updating kernel streams for channel fd %d", fd); | |
796 | ||
54d01ffb | 797 | session_lock_list(); |
b5541356 | 798 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 799 | session_lock(session); |
7a485870 | 800 | if (session->kernel_session == NULL) { |
54d01ffb | 801 | session_unlock(session); |
7a485870 DG |
802 | continue; |
803 | } | |
173af62f | 804 | ksess = session->kernel_session; |
d9800920 | 805 | |
173af62f | 806 | cds_list_for_each_entry(channel, &ksess->channel_list.head, list) { |
7a485870 DG |
807 | if (channel->fd == fd) { |
808 | DBG("Channel found, updating kernel streams"); | |
809 | ret = kernel_open_channel_stream(channel); | |
810 | if (ret < 0) { | |
b3c750d2 | 811 | goto error; |
7a485870 | 812 | } |
5c786ded JD |
813 | /* Update the stream global counter */ |
814 | ksess->stream_count_global += ret; | |
d9800920 | 815 | |
7a485870 | 816 | /* |
5eb91c98 DG |
817 | * Have we already sent fds to the consumer? If yes, it means |
818 | * that tracing is started so it is safe to send our updated | |
819 | * stream fds. | |
7a485870 | 820 | */ |
173af62f DG |
821 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
822 | struct lttng_ht_iter iter; | |
823 | struct consumer_socket *socket; | |
824 | ||
e7fe706f | 825 | rcu_read_lock(); |
173af62f DG |
826 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, |
827 | &iter.iter, socket, node.node) { | |
173af62f | 828 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 829 | ret = kernel_consumer_send_channel_stream(socket, |
2bba9e53 DG |
830 | channel, ksess, |
831 | session->output_traces ? 1 : 0); | |
173af62f DG |
832 | pthread_mutex_unlock(socket->lock); |
833 | if (ret < 0) { | |
e7fe706f | 834 | rcu_read_unlock(); |
173af62f DG |
835 | goto error; |
836 | } | |
7a485870 | 837 | } |
e7fe706f | 838 | rcu_read_unlock(); |
7a485870 | 839 | } |
b3c750d2 | 840 | goto error; |
7a485870 DG |
841 | } |
842 | } | |
54d01ffb | 843 | session_unlock(session); |
7a485870 | 844 | } |
54d01ffb | 845 | session_unlock_list(); |
b3c750d2 | 846 | return ret; |
7a485870 | 847 | |
b3c750d2 | 848 | error: |
54d01ffb DG |
849 | session_unlock(session); |
850 | session_unlock_list(); | |
7a485870 DG |
851 | return ret; |
852 | } | |
853 | ||
487cf67c | 854 | /* |
ffe60014 DG |
855 | * For each tracing session, update newly registered apps. The session list |
856 | * lock MUST be acquired before calling this. | |
487cf67c DG |
857 | */ |
858 | static void update_ust_app(int app_sock) | |
859 | { | |
860 | struct ltt_session *sess, *stmp; | |
861 | ||
fdadac08 DG |
862 | /* Consumer is in an ERROR state. Stop any application update. */ |
863 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
864 | /* Stop the update process since the consumer is dead. */ | |
865 | return; | |
866 | } | |
867 | ||
487cf67c DG |
868 | /* For all tracing session(s) */ |
869 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 870 | session_lock(sess); |
421cb601 DG |
871 | if (sess->ust_session) { |
872 | ust_app_global_update(sess->ust_session, app_sock); | |
873 | } | |
4ee14516 | 874 | session_unlock(sess); |
487cf67c DG |
875 | } |
876 | } | |
877 | ||
7a485870 | 878 | /* |
d063d709 | 879 | * This thread manage event coming from the kernel. |
7a485870 | 880 | * |
d063d709 DG |
881 | * Features supported in this thread: |
882 | * -) CPU Hotplug | |
7a485870 DG |
883 | */ |
884 | static void *thread_manage_kernel(void *data) | |
885 | { | |
139ac872 | 886 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 887 | uint32_t revents, nb_fd; |
7a485870 | 888 | char tmp; |
5eb91c98 | 889 | struct lttng_poll_event events; |
7a485870 | 890 | |
6993eeb3 | 891 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 892 | |
6c71277b | 893 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL); |
927ca06a | 894 | |
d5d63bf1 DG |
895 | /* |
896 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 897 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 898 | */ |
6d737ce4 | 899 | lttng_poll_init(&events); |
d5d63bf1 | 900 | |
e547b070 | 901 | if (testpoint(sessiond_thread_manage_kernel)) { |
6993eeb3 CB |
902 | goto error_testpoint; |
903 | } | |
8ac94142 | 904 | |
840cb59c | 905 | health_code_update(); |
44a5e5eb | 906 | |
e547b070 | 907 | if (testpoint(sessiond_thread_manage_kernel_before_loop)) { |
d21b0d71 | 908 | goto error_testpoint; |
6993eeb3 CB |
909 | } |
910 | ||
7a485870 | 911 | while (1) { |
840cb59c | 912 | health_code_update(); |
44a5e5eb | 913 | |
7a485870 | 914 | if (update_poll_flag == 1) { |
d21b0d71 DG |
915 | /* Clean events object. We are about to populate it again. */ |
916 | lttng_poll_clean(&events); | |
917 | ||
d0b96690 | 918 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
919 | if (ret < 0) { |
920 | goto error_poll_create; | |
921 | } | |
922 | ||
923 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
924 | if (ret < 0) { | |
925 | goto error; | |
926 | } | |
5f822d0a | 927 | |
d21b0d71 | 928 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
929 | ret = update_kernel_poll(&events); |
930 | if (ret < 0) { | |
7a485870 DG |
931 | goto error; |
932 | } | |
933 | update_poll_flag = 0; | |
934 | } | |
935 | ||
d21b0d71 | 936 | DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events)); |
7a485870 DG |
937 | |
938 | /* Poll infinite value of time */ | |
88f2b785 | 939 | restart: |
a78af745 | 940 | health_poll_entry(); |
5eb91c98 | 941 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 942 | health_poll_exit(); |
7a485870 | 943 | if (ret < 0) { |
88f2b785 MD |
944 | /* |
945 | * Restart interrupted system call. | |
946 | */ | |
947 | if (errno == EINTR) { | |
948 | goto restart; | |
949 | } | |
7a485870 DG |
950 | goto error; |
951 | } else if (ret == 0) { | |
952 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
953 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
954 | "This should not have happened! Continuing..."); | |
7a485870 DG |
955 | continue; |
956 | } | |
957 | ||
0d9c5d77 DG |
958 | nb_fd = ret; |
959 | ||
5eb91c98 DG |
960 | for (i = 0; i < nb_fd; i++) { |
961 | /* Fetch once the poll data */ | |
962 | revents = LTTNG_POLL_GETEV(&events, i); | |
963 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 964 | |
840cb59c | 965 | health_code_update(); |
44a5e5eb | 966 | |
5eb91c98 | 967 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 968 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 969 | if (ret) { |
139ac872 MD |
970 | err = 0; |
971 | goto exit; | |
5eb91c98 | 972 | } |
7a485870 | 973 | |
5eb91c98 DG |
974 | /* Check for data on kernel pipe */ |
975 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
6cd525e8 MD |
976 | (void) lttng_read(kernel_poll_pipe[0], |
977 | &tmp, 1); | |
f921c78f DG |
978 | /* |
979 | * Ret value is useless here, if this pipe gets any actions an | |
980 | * update is required anyway. | |
981 | */ | |
5eb91c98 DG |
982 | update_poll_flag = 1; |
983 | continue; | |
984 | } else { | |
985 | /* | |
986 | * New CPU detected by the kernel. Adding kernel stream to | |
987 | * kernel session and updating the kernel consumer | |
988 | */ | |
989 | if (revents & LPOLLIN) { | |
2bdd86d4 | 990 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
991 | if (ret < 0) { |
992 | continue; | |
993 | } | |
994 | break; | |
995 | /* | |
996 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
997 | * and unregister kernel stream at this point. | |
998 | */ | |
7a485870 | 999 | } |
7a485870 DG |
1000 | } |
1001 | } | |
1002 | } | |
1003 | ||
139ac872 | 1004 | exit: |
7a485870 | 1005 | error: |
5eb91c98 | 1006 | lttng_poll_clean(&events); |
76d7553f | 1007 | error_poll_create: |
6993eeb3 | 1008 | error_testpoint: |
6620da75 DG |
1009 | utils_close_pipe(kernel_poll_pipe); |
1010 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 1011 | if (err) { |
840cb59c | 1012 | health_error(); |
139ac872 | 1013 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
1014 | WARN("Kernel thread died unexpectedly. " |
1015 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 1016 | } |
8782cc74 | 1017 | health_unregister(health_sessiond); |
76d7553f | 1018 | DBG("Kernel thread dying"); |
7a485870 DG |
1019 | return NULL; |
1020 | } | |
1021 | ||
a23ec3a7 DG |
1022 | /* |
1023 | * Signal pthread condition of the consumer data that the thread. | |
1024 | */ | |
1025 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
1026 | { | |
1027 | pthread_mutex_lock(&data->cond_mutex); | |
1028 | ||
1029 | /* | |
1030 | * The state is set before signaling. It can be any value, it's the waiter | |
1031 | * job to correctly interpret this condition variable associated to the | |
1032 | * consumer pthread_cond. | |
1033 | * | |
1034 | * A value of 0 means that the corresponding thread of the consumer data | |
1035 | * was not started. 1 indicates that the thread has started and is ready | |
1036 | * for action. A negative value means that there was an error during the | |
1037 | * thread bootstrap. | |
1038 | */ | |
1039 | data->consumer_thread_is_ready = state; | |
1040 | (void) pthread_cond_signal(&data->cond); | |
1041 | ||
1042 | pthread_mutex_unlock(&data->cond_mutex); | |
1043 | } | |
1044 | ||
1d4b027a | 1045 | /* |
3bd1e081 | 1046 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 1047 | */ |
3bd1e081 | 1048 | static void *thread_manage_consumer(void *data) |
1d4b027a | 1049 | { |
139ac872 | 1050 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 1051 | uint32_t revents, nb_fd; |
1d4b027a | 1052 | enum lttcomm_return_code code; |
5eb91c98 | 1053 | struct lttng_poll_event events; |
3bd1e081 | 1054 | struct consumer_data *consumer_data = data; |
1d4b027a | 1055 | |
3bd1e081 | 1056 | DBG("[thread] Manage consumer started"); |
1d4b027a | 1057 | |
6c71277b | 1058 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER); |
927ca06a | 1059 | |
855060f8 | 1060 | health_code_update(); |
9449cc75 | 1061 | |
5eb91c98 | 1062 | /* |
331744e3 JD |
1063 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
1064 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 1065 | */ |
331744e3 | 1066 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 1067 | if (ret < 0) { |
76d7553f | 1068 | goto error_poll; |
5eb91c98 | 1069 | } |
273ea72c | 1070 | |
edb8b045 DG |
1071 | /* |
1072 | * The error socket here is already in a listening state which was done | |
1073 | * just before spawning this thread to avoid a race between the consumer | |
1074 | * daemon exec trying to connect and the listen() call. | |
1075 | */ | |
3bd1e081 | 1076 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
1077 | if (ret < 0) { |
1078 | goto error; | |
1079 | } | |
1080 | ||
840cb59c | 1081 | health_code_update(); |
44a5e5eb | 1082 | |
331744e3 | 1083 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1084 | restart: |
a78af745 | 1085 | health_poll_entry(); |
8ac94142 | 1086 | |
e547b070 | 1087 | if (testpoint(sessiond_thread_manage_consumer)) { |
6993eeb3 CB |
1088 | goto error; |
1089 | } | |
8ac94142 | 1090 | |
5eb91c98 | 1091 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1092 | health_poll_exit(); |
273ea72c | 1093 | if (ret < 0) { |
88f2b785 MD |
1094 | /* |
1095 | * Restart interrupted system call. | |
1096 | */ | |
1097 | if (errno == EINTR) { | |
1098 | goto restart; | |
1099 | } | |
273ea72c DG |
1100 | goto error; |
1101 | } | |
1102 | ||
0d9c5d77 DG |
1103 | nb_fd = ret; |
1104 | ||
5eb91c98 DG |
1105 | for (i = 0; i < nb_fd; i++) { |
1106 | /* Fetch once the poll data */ | |
1107 | revents = LTTNG_POLL_GETEV(&events, i); | |
1108 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1109 | ||
840cb59c | 1110 | health_code_update(); |
44a5e5eb | 1111 | |
5eb91c98 | 1112 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1113 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1114 | if (ret) { |
139ac872 MD |
1115 | err = 0; |
1116 | goto exit; | |
5eb91c98 DG |
1117 | } |
1118 | ||
1119 | /* Event on the registration socket */ | |
3bd1e081 | 1120 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 1121 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 1122 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
1123 | goto error; |
1124 | } | |
1125 | } | |
273ea72c DG |
1126 | } |
1127 | ||
3bd1e081 | 1128 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1129 | if (sock < 0) { |
1130 | goto error; | |
1131 | } | |
1132 | ||
b662582b DG |
1133 | /* |
1134 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
1135 | * show must go on. | |
1136 | */ | |
1137 | (void) utils_set_fd_cloexec(sock); | |
1138 | ||
840cb59c | 1139 | health_code_update(); |
44a5e5eb | 1140 | |
3bd1e081 | 1141 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1142 | |
712ea556 | 1143 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1144 | ret = lttcomm_recv_unix_sock(sock, &code, |
1145 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1146 | if (ret <= 0) { |
1147 | goto error; | |
1148 | } | |
1149 | ||
840cb59c | 1150 | health_code_update(); |
44a5e5eb | 1151 | |
f73fabfd | 1152 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
331744e3 | 1153 | /* Connect both socket, command and metadata. */ |
3bd1e081 MD |
1154 | consumer_data->cmd_sock = |
1155 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
4ce514c4 | 1156 | consumer_data->metadata_fd = |
331744e3 | 1157 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); |
92db7cdc DG |
1158 | if (consumer_data->cmd_sock < 0 |
1159 | || consumer_data->metadata_fd < 0) { | |
331744e3 | 1160 | PERROR("consumer connect cmd socket"); |
a23ec3a7 DG |
1161 | /* On error, signal condition and quit. */ |
1162 | signal_consumer_condition(consumer_data, -1); | |
1d4b027a DG |
1163 | goto error; |
1164 | } | |
9363801e | 1165 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; |
331744e3 JD |
1166 | /* Create metadata socket lock. */ |
1167 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1168 | if (consumer_data->metadata_sock.lock == NULL) { | |
1169 | PERROR("zmalloc pthread mutex"); | |
1170 | ret = -1; | |
1171 | goto error; | |
1172 | } | |
1173 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1174 | ||
a23ec3a7 | 1175 | signal_consumer_condition(consumer_data, 1); |
331744e3 JD |
1176 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); |
1177 | DBG("Consumer metadata socket ready (fd: %d)", | |
4ce514c4 | 1178 | consumer_data->metadata_fd); |
1d4b027a | 1179 | } else { |
3bd1e081 | 1180 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1181 | lttcomm_get_readable_code(-code)); |
1182 | goto error; | |
1183 | } | |
1184 | ||
331744e3 | 1185 | /* Remove the consumerd error sock since we've established a connexion */ |
3bd1e081 | 1186 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1187 | if (ret < 0) { |
72079cae DG |
1188 | goto error; |
1189 | } | |
1190 | ||
331744e3 | 1191 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1192 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1193 | if (ret < 0) { | |
72079cae | 1194 | goto error; |
5eb91c98 DG |
1195 | } |
1196 | ||
331744e3 | 1197 | /* Add metadata socket that is successfully connected. */ |
4ce514c4 | 1198 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, |
331744e3 JD |
1199 | LPOLLIN | LPOLLRDHUP); |
1200 | if (ret < 0) { | |
1201 | goto error; | |
1202 | } | |
1203 | ||
840cb59c | 1204 | health_code_update(); |
44a5e5eb | 1205 | |
331744e3 | 1206 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1207 | restart_poll: |
331744e3 JD |
1208 | while (1) { |
1209 | health_poll_entry(); | |
1210 | ret = lttng_poll_wait(&events, -1); | |
1211 | health_poll_exit(); | |
1212 | if (ret < 0) { | |
1213 | /* | |
1214 | * Restart interrupted system call. | |
1215 | */ | |
1216 | if (errno == EINTR) { | |
1217 | goto restart_poll; | |
1218 | } | |
1219 | goto error; | |
88f2b785 | 1220 | } |
72079cae | 1221 | |
331744e3 | 1222 | nb_fd = ret; |
0d9c5d77 | 1223 | |
331744e3 JD |
1224 | for (i = 0; i < nb_fd; i++) { |
1225 | /* Fetch once the poll data */ | |
1226 | revents = LTTNG_POLL_GETEV(&events, i); | |
1227 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1228 | |
331744e3 | 1229 | health_code_update(); |
44a5e5eb | 1230 | |
331744e3 JD |
1231 | /* Thread quit pipe has been closed. Killing thread. */ |
1232 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); | |
1233 | if (ret) { | |
1234 | err = 0; | |
1235 | goto exit; | |
1236 | } | |
5eb91c98 | 1237 | |
331744e3 JD |
1238 | if (pollfd == sock) { |
1239 | /* Event on the consumerd socket */ | |
1240 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1241 | ERR("consumer err socket second poll error"); | |
1242 | goto error; | |
1243 | } | |
1244 | health_code_update(); | |
1245 | /* Wait for any kconsumerd error */ | |
1246 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1247 | sizeof(enum lttcomm_return_code)); | |
1248 | if (ret <= 0) { | |
1249 | ERR("consumer closed the command socket"); | |
1250 | goto error; | |
1251 | } | |
1252 | ||
1253 | ERR("consumer return code : %s", | |
1254 | lttcomm_get_readable_code(-code)); | |
1255 | ||
1256 | goto exit; | |
4ce514c4 | 1257 | } else if (pollfd == consumer_data->metadata_fd) { |
331744e3 JD |
1258 | /* UST metadata requests */ |
1259 | ret = ust_consumer_metadata_request( | |
1260 | &consumer_data->metadata_sock); | |
1261 | if (ret < 0) { | |
1262 | ERR("Handling metadata request"); | |
1263 | goto error; | |
1264 | } | |
1265 | break; | |
1266 | } else { | |
1267 | ERR("Unknown pollfd"); | |
5eb91c98 DG |
1268 | goto error; |
1269 | } | |
1270 | } | |
331744e3 | 1271 | health_code_update(); |
5eb91c98 DG |
1272 | } |
1273 | ||
139ac872 | 1274 | exit: |
1d4b027a | 1275 | error: |
fdadac08 DG |
1276 | /* |
1277 | * We lock here because we are about to close the sockets and some other | |
92db7cdc DG |
1278 | * thread might be using them so get exclusive access which will abort all |
1279 | * other consumer command by other threads. | |
fdadac08 DG |
1280 | */ |
1281 | pthread_mutex_lock(&consumer_data->lock); | |
1282 | ||
5c827ce0 DG |
1283 | /* Immediately set the consumerd state to stopped */ |
1284 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1285 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1286 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1287 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1288 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1289 | } else { | |
1290 | /* Code flow error... */ | |
1291 | assert(0); | |
1292 | } | |
1293 | ||
76d7553f MD |
1294 | if (consumer_data->err_sock >= 0) { |
1295 | ret = close(consumer_data->err_sock); | |
1296 | if (ret) { | |
1297 | PERROR("close"); | |
1298 | } | |
a76cbd9f | 1299 | consumer_data->err_sock = -1; |
76d7553f MD |
1300 | } |
1301 | if (consumer_data->cmd_sock >= 0) { | |
1302 | ret = close(consumer_data->cmd_sock); | |
1303 | if (ret) { | |
1304 | PERROR("close"); | |
1305 | } | |
a76cbd9f | 1306 | consumer_data->cmd_sock = -1; |
76d7553f | 1307 | } |
9363801e DG |
1308 | if (*consumer_data->metadata_sock.fd_ptr >= 0) { |
1309 | ret = close(*consumer_data->metadata_sock.fd_ptr); | |
331744e3 JD |
1310 | if (ret) { |
1311 | PERROR("close"); | |
1312 | } | |
1313 | } | |
331744e3 | 1314 | |
76d7553f MD |
1315 | if (sock >= 0) { |
1316 | ret = close(sock); | |
1317 | if (ret) { | |
1318 | PERROR("close"); | |
1319 | } | |
1320 | } | |
273ea72c | 1321 | |
3bd1e081 MD |
1322 | unlink(consumer_data->err_unix_sock_path); |
1323 | unlink(consumer_data->cmd_unix_sock_path); | |
1324 | consumer_data->pid = 0; | |
fdadac08 | 1325 | pthread_mutex_unlock(&consumer_data->lock); |
92db7cdc | 1326 | |
fdadac08 DG |
1327 | /* Cleanup metadata socket mutex. */ |
1328 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1329 | free(consumer_data->metadata_sock.lock); | |
1d4b027a | 1330 | |
5eb91c98 | 1331 | lttng_poll_clean(&events); |
76d7553f | 1332 | error_poll: |
139ac872 | 1333 | if (err) { |
840cb59c | 1334 | health_error(); |
139ac872 MD |
1335 | ERR("Health error occurred in %s", __func__); |
1336 | } | |
8782cc74 | 1337 | health_unregister(health_sessiond); |
76d7553f | 1338 | DBG("consumer thread cleanup completed"); |
0177d773 | 1339 | |
5eb91c98 | 1340 | return NULL; |
099e26bd DG |
1341 | } |
1342 | ||
099e26bd DG |
1343 | /* |
1344 | * This thread manage application communication. | |
1d4b027a DG |
1345 | */ |
1346 | static void *thread_manage_apps(void *data) | |
099e26bd | 1347 | { |
139ac872 | 1348 | int i, ret, pollfd, err = -1; |
6cd525e8 | 1349 | ssize_t size_ret; |
5eb91c98 | 1350 | uint32_t revents, nb_fd; |
5eb91c98 | 1351 | struct lttng_poll_event events; |
099e26bd DG |
1352 | |
1353 | DBG("[thread] Manage application started"); | |
1354 | ||
f6a9efaa DG |
1355 | rcu_register_thread(); |
1356 | rcu_thread_online(); | |
1357 | ||
6c71277b | 1358 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE); |
927ca06a | 1359 | |
e547b070 | 1360 | if (testpoint(sessiond_thread_manage_apps)) { |
6993eeb3 CB |
1361 | goto error_testpoint; |
1362 | } | |
1363 | ||
840cb59c | 1364 | health_code_update(); |
44a5e5eb | 1365 | |
d0b96690 | 1366 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1367 | if (ret < 0) { |
76d7553f | 1368 | goto error_poll_create; |
5eb91c98 | 1369 | } |
099e26bd | 1370 | |
5eb91c98 DG |
1371 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1372 | if (ret < 0) { | |
1373 | goto error; | |
1374 | } | |
099e26bd | 1375 | |
e547b070 | 1376 | if (testpoint(sessiond_thread_manage_apps_before_loop)) { |
6993eeb3 CB |
1377 | goto error; |
1378 | } | |
8ac94142 | 1379 | |
840cb59c | 1380 | health_code_update(); |
44a5e5eb | 1381 | |
5eb91c98 | 1382 | while (1) { |
d21b0d71 | 1383 | DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events)); |
099e26bd DG |
1384 | |
1385 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1386 | restart: |
a78af745 | 1387 | health_poll_entry(); |
5eb91c98 | 1388 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1389 | health_poll_exit(); |
099e26bd | 1390 | if (ret < 0) { |
88f2b785 MD |
1391 | /* |
1392 | * Restart interrupted system call. | |
1393 | */ | |
1394 | if (errno == EINTR) { | |
1395 | goto restart; | |
1396 | } | |
099e26bd DG |
1397 | goto error; |
1398 | } | |
1399 | ||
0d9c5d77 DG |
1400 | nb_fd = ret; |
1401 | ||
5eb91c98 DG |
1402 | for (i = 0; i < nb_fd; i++) { |
1403 | /* Fetch once the poll data */ | |
1404 | revents = LTTNG_POLL_GETEV(&events, i); | |
1405 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1406 | ||
840cb59c | 1407 | health_code_update(); |
44a5e5eb | 1408 | |
5eb91c98 | 1409 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1410 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1411 | if (ret) { |
139ac872 MD |
1412 | err = 0; |
1413 | goto exit; | |
5eb91c98 | 1414 | } |
099e26bd | 1415 | |
5eb91c98 DG |
1416 | /* Inspect the apps cmd pipe */ |
1417 | if (pollfd == apps_cmd_pipe[0]) { | |
1418 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1419 | ERR("Apps command pipe error"); | |
0177d773 | 1420 | goto error; |
5eb91c98 | 1421 | } else if (revents & LPOLLIN) { |
d0b96690 DG |
1422 | int sock; |
1423 | ||
5eb91c98 | 1424 | /* Empty pipe */ |
6cd525e8 MD |
1425 | size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
1426 | if (size_ret < sizeof(sock)) { | |
76d7553f | 1427 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1428 | goto error; |
1429 | } | |
099e26bd | 1430 | |
840cb59c | 1431 | health_code_update(); |
44a5e5eb | 1432 | |
ffe60014 | 1433 | /* |
d0b96690 DG |
1434 | * We only monitor the error events of the socket. This |
1435 | * thread does not handle any incoming data from UST | |
1436 | * (POLLIN). | |
ffe60014 | 1437 | */ |
d0b96690 DG |
1438 | ret = lttng_poll_add(&events, sock, |
1439 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1440 | if (ret < 0) { | |
5eb91c98 | 1441 | goto error; |
e0c7ec2b | 1442 | } |
acc7b41b | 1443 | |
d0b96690 | 1444 | DBG("Apps with sock %d added to poll set", sock); |
0177d773 | 1445 | } |
5eb91c98 DG |
1446 | } else { |
1447 | /* | |
54d01ffb DG |
1448 | * At this point, we know that a registered application made |
1449 | * the event at poll_wait. | |
5eb91c98 DG |
1450 | */ |
1451 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1452 | /* Removing from the poll set */ | |
1453 | ret = lttng_poll_del(&events, pollfd); | |
1454 | if (ret < 0) { | |
1455 | goto error; | |
1456 | } | |
099e26bd | 1457 | |
b9d9b220 | 1458 | /* Socket closed on remote end. */ |
56fff090 | 1459 | ust_app_unregister(pollfd); |
5eb91c98 | 1460 | } |
099e26bd | 1461 | } |
44a5e5eb | 1462 | |
840cb59c | 1463 | health_code_update(); |
099e26bd | 1464 | } |
099e26bd DG |
1465 | } |
1466 | ||
139ac872 | 1467 | exit: |
099e26bd | 1468 | error: |
5eb91c98 | 1469 | lttng_poll_clean(&events); |
76d7553f | 1470 | error_poll_create: |
6993eeb3 | 1471 | error_testpoint: |
6620da75 DG |
1472 | utils_close_pipe(apps_cmd_pipe); |
1473 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1474 | ||
1475 | /* | |
1476 | * We don't clean the UST app hash table here since already registered | |
1477 | * applications can still be controlled so let them be until the session | |
1478 | * daemon dies or the applications stop. | |
1479 | */ | |
1480 | ||
139ac872 | 1481 | if (err) { |
840cb59c | 1482 | health_error(); |
139ac872 MD |
1483 | ERR("Health error occurred in %s", __func__); |
1484 | } | |
8782cc74 | 1485 | health_unregister(health_sessiond); |
76d7553f | 1486 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1487 | rcu_thread_offline(); |
1488 | rcu_unregister_thread(); | |
099e26bd DG |
1489 | return NULL; |
1490 | } | |
1491 | ||
d0b96690 | 1492 | /* |
d88aee68 DG |
1493 | * Send a socket to a thread This is called from the dispatch UST registration |
1494 | * thread once all sockets are set for the application. | |
d0b96690 | 1495 | * |
b85dc84c DG |
1496 | * The sock value can be invalid, we don't really care, the thread will handle |
1497 | * it and make the necessary cleanup if so. | |
1498 | * | |
d0b96690 DG |
1499 | * On success, return 0 else a negative value being the errno message of the |
1500 | * write(). | |
1501 | */ | |
d88aee68 | 1502 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 | 1503 | { |
6cd525e8 | 1504 | ssize_t ret; |
d0b96690 | 1505 | |
b85dc84c DG |
1506 | /* |
1507 | * It's possible that the FD is set as invalid with -1 concurrently just | |
1508 | * before calling this function being a shutdown state of the thread. | |
1509 | */ | |
1510 | if (fd < 0) { | |
1511 | ret = -EBADF; | |
1512 | goto error; | |
1513 | } | |
d0b96690 | 1514 | |
6cd525e8 MD |
1515 | ret = lttng_write(fd, &sock, sizeof(sock)); |
1516 | if (ret < sizeof(sock)) { | |
d88aee68 | 1517 | PERROR("write apps pipe %d", fd); |
d0b96690 DG |
1518 | if (ret < 0) { |
1519 | ret = -errno; | |
1520 | } | |
1521 | goto error; | |
1522 | } | |
1523 | ||
1524 | /* All good. Don't send back the write positive ret value. */ | |
1525 | ret = 0; | |
1526 | error: | |
6cd525e8 | 1527 | return (int) ret; |
d0b96690 DG |
1528 | } |
1529 | ||
f45e313d DG |
1530 | /* |
1531 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1532 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1533 | * notify socket is never received. | |
1534 | */ | |
1535 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1536 | { | |
1537 | int ret, nb_fd = 0, i; | |
1538 | unsigned int fd_added = 0; | |
1539 | struct lttng_poll_event events; | |
1540 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1541 | ||
1542 | assert(wait_queue); | |
1543 | ||
1544 | lttng_poll_init(&events); | |
1545 | ||
1546 | /* Just skip everything for an empty queue. */ | |
1547 | if (!wait_queue->count) { | |
1548 | goto end; | |
1549 | } | |
1550 | ||
1551 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1552 | if (ret < 0) { | |
1553 | goto error_create; | |
1554 | } | |
1555 | ||
1556 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1557 | &wait_queue->head, head) { | |
1558 | assert(wait_node->app); | |
1559 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1560 | LPOLLHUP | LPOLLERR); | |
1561 | if (ret < 0) { | |
1562 | goto error; | |
1563 | } | |
1564 | ||
1565 | fd_added = 1; | |
1566 | } | |
1567 | ||
1568 | if (!fd_added) { | |
1569 | goto end; | |
1570 | } | |
1571 | ||
1572 | /* | |
1573 | * Poll but don't block so we can quickly identify the faulty events and | |
1574 | * clean them afterwards from the wait queue. | |
1575 | */ | |
1576 | ret = lttng_poll_wait(&events, 0); | |
1577 | if (ret < 0) { | |
1578 | goto error; | |
1579 | } | |
1580 | nb_fd = ret; | |
1581 | ||
1582 | for (i = 0; i < nb_fd; i++) { | |
1583 | /* Get faulty FD. */ | |
1584 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1585 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1586 | ||
1587 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1588 | &wait_queue->head, head) { | |
1589 | if (pollfd == wait_node->app->sock && | |
1590 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1591 | cds_list_del(&wait_node->head); | |
1592 | wait_queue->count--; | |
1593 | ust_app_destroy(wait_node->app); | |
1594 | free(wait_node); | |
1595 | break; | |
1596 | } | |
1597 | } | |
1598 | } | |
1599 | ||
1600 | if (nb_fd > 0) { | |
1601 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1602 | } | |
1603 | ||
1604 | end: | |
1605 | lttng_poll_clean(&events); | |
1606 | return; | |
1607 | ||
1608 | error: | |
1609 | lttng_poll_clean(&events); | |
1610 | error_create: | |
1611 | ERR("Unable to sanitize wait queue"); | |
1612 | return; | |
1613 | } | |
1614 | ||
099e26bd DG |
1615 | /* |
1616 | * Dispatch request from the registration threads to the application | |
1617 | * communication thread. | |
1618 | */ | |
1619 | static void *thread_dispatch_ust_registration(void *data) | |
1620 | { | |
12e2b881 | 1621 | int ret, err = -1; |
099e26bd DG |
1622 | struct cds_wfq_node *node; |
1623 | struct ust_command *ust_cmd = NULL; | |
f45e313d DG |
1624 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1625 | struct ust_reg_wait_queue wait_queue = { | |
1626 | .count = 0, | |
1627 | }; | |
d0b96690 | 1628 | |
6c71277b | 1629 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH); |
12e2b881 MD |
1630 | |
1631 | health_code_update(); | |
1632 | ||
f45e313d | 1633 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1634 | |
1635 | DBG("[thread] Dispatch UST command started"); | |
1636 | ||
26c9d55e | 1637 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
12e2b881 MD |
1638 | health_code_update(); |
1639 | ||
099e26bd DG |
1640 | /* Atomically prepare the queue futex */ |
1641 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1642 | ||
1643 | do { | |
d0b96690 | 1644 | struct ust_app *app = NULL; |
7972aab2 | 1645 | ust_cmd = NULL; |
d0b96690 | 1646 | |
f45e313d DG |
1647 | /* |
1648 | * Make sure we don't have node(s) that have hung up before receiving | |
1649 | * the notify socket. This is to clean the list in order to avoid | |
1650 | * memory leaks from notify socket that are never seen. | |
1651 | */ | |
1652 | sanitize_wait_queue(&wait_queue); | |
1653 | ||
12e2b881 | 1654 | health_code_update(); |
099e26bd DG |
1655 | /* Dequeue command for registration */ |
1656 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1657 | if (node == NULL) { | |
00a17c97 | 1658 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1659 | /* Continue thread execution */ |
1660 | break; | |
1661 | } | |
1662 | ||
1663 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1664 | ||
2f50c8a3 DG |
1665 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1666 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1667 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1668 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1669 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1670 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1671 | |
1672 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1673 | wait_node = zmalloc(sizeof(*wait_node)); | |
1674 | if (!wait_node) { | |
1675 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1676 | ret = close(ust_cmd->sock); |
1677 | if (ret < 0) { | |
1678 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1679 | } | |
51dec90d | 1680 | lttng_fd_put(LTTNG_FD_APPS, 1); |
7972aab2 | 1681 | free(ust_cmd); |
d0b96690 DG |
1682 | goto error; |
1683 | } | |
1684 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1685 | ||
1686 | /* Create application object if socket is CMD. */ | |
1687 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1688 | ust_cmd->sock); | |
1689 | if (!wait_node->app) { | |
1690 | ret = close(ust_cmd->sock); | |
1691 | if (ret < 0) { | |
1692 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1693 | } |
51dec90d | 1694 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 1695 | free(wait_node); |
7972aab2 | 1696 | free(ust_cmd); |
d0b96690 DG |
1697 | continue; |
1698 | } | |
1699 | /* | |
1700 | * Add application to the wait queue so we can set the notify | |
1701 | * socket before putting this object in the global ht. | |
1702 | */ | |
f45e313d DG |
1703 | cds_list_add(&wait_node->head, &wait_queue.head); |
1704 | wait_queue.count++; | |
d0b96690 | 1705 | |
7972aab2 | 1706 | free(ust_cmd); |
d0b96690 DG |
1707 | /* |
1708 | * We have to continue here since we don't have the notify | |
1709 | * socket and the application MUST be added to the hash table | |
1710 | * only at that moment. | |
1711 | */ | |
1712 | continue; | |
1713 | } else { | |
1714 | /* | |
1715 | * Look for the application in the local wait queue and set the | |
1716 | * notify socket if found. | |
1717 | */ | |
d88aee68 | 1718 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1719 | &wait_queue.head, head) { |
12e2b881 | 1720 | health_code_update(); |
d0b96690 DG |
1721 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1722 | wait_node->app->notify_sock = ust_cmd->sock; | |
1723 | cds_list_del(&wait_node->head); | |
f45e313d | 1724 | wait_queue.count--; |
d0b96690 DG |
1725 | app = wait_node->app; |
1726 | free(wait_node); | |
1727 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1728 | break; | |
1729 | } | |
1730 | } | |
020d7f60 DG |
1731 | |
1732 | /* | |
1733 | * With no application at this stage the received socket is | |
1734 | * basically useless so close it before we free the cmd data | |
1735 | * structure for good. | |
1736 | */ | |
1737 | if (!app) { | |
1738 | ret = close(ust_cmd->sock); | |
1739 | if (ret < 0) { | |
1740 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1741 | } | |
51dec90d | 1742 | lttng_fd_put(LTTNG_FD_APPS, 1); |
020d7f60 | 1743 | } |
7972aab2 | 1744 | free(ust_cmd); |
d0b96690 DG |
1745 | } |
1746 | ||
1747 | if (app) { | |
d0b96690 DG |
1748 | /* |
1749 | * @session_lock_list | |
1750 | * | |
1751 | * Lock the global session list so from the register up to the | |
1752 | * registration done message, no thread can see the application | |
1753 | * and change its state. | |
1754 | */ | |
1755 | session_lock_list(); | |
1756 | rcu_read_lock(); | |
d88aee68 | 1757 | |
d0b96690 DG |
1758 | /* |
1759 | * Add application to the global hash table. This needs to be | |
1760 | * done before the update to the UST registry can locate the | |
1761 | * application. | |
1762 | */ | |
1763 | ust_app_add(app); | |
d88aee68 DG |
1764 | |
1765 | /* Set app version. This call will print an error if needed. */ | |
1766 | (void) ust_app_version(app); | |
1767 | ||
1768 | /* Send notify socket through the notify pipe. */ | |
1769 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1770 | app->notify_sock); | |
1771 | if (ret < 0) { | |
1772 | rcu_read_unlock(); | |
1773 | session_unlock_list(); | |
b85dc84c DG |
1774 | /* |
1775 | * No notify thread, stop the UST tracing. However, this is | |
1776 | * not an internal error of the this thread thus setting | |
1777 | * the health error code to a normal exit. | |
1778 | */ | |
1779 | err = 0; | |
d88aee68 | 1780 | goto error; |
6620da75 | 1781 | } |
d88aee68 | 1782 | |
d0b96690 DG |
1783 | /* |
1784 | * Update newly registered application with the tracing | |
1785 | * registry info already enabled information. | |
1786 | */ | |
1787 | update_ust_app(app->sock); | |
d88aee68 DG |
1788 | |
1789 | /* | |
1790 | * Don't care about return value. Let the manage apps threads | |
1791 | * handle app unregistration upon socket close. | |
1792 | */ | |
1793 | (void) ust_app_register_done(app->sock); | |
1794 | ||
1795 | /* | |
1796 | * Even if the application socket has been closed, send the app | |
1797 | * to the thread and unregistration will take place at that | |
1798 | * place. | |
1799 | */ | |
1800 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1801 | if (ret < 0) { |
d88aee68 DG |
1802 | rcu_read_unlock(); |
1803 | session_unlock_list(); | |
b85dc84c DG |
1804 | /* |
1805 | * No apps. thread, stop the UST tracing. However, this is | |
1806 | * not an internal error of the this thread thus setting | |
1807 | * the health error code to a normal exit. | |
1808 | */ | |
1809 | err = 0; | |
d88aee68 | 1810 | goto error; |
d0b96690 | 1811 | } |
d88aee68 | 1812 | |
d0b96690 DG |
1813 | rcu_read_unlock(); |
1814 | session_unlock_list(); | |
099e26bd | 1815 | } |
099e26bd DG |
1816 | } while (node != NULL); |
1817 | ||
12e2b881 | 1818 | health_poll_entry(); |
099e26bd DG |
1819 | /* Futex wait on queue. Blocking call on futex() */ |
1820 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 1821 | health_poll_exit(); |
099e26bd | 1822 | } |
12e2b881 MD |
1823 | /* Normal exit, no error */ |
1824 | err = 0; | |
099e26bd DG |
1825 | |
1826 | error: | |
d88aee68 DG |
1827 | /* Clean up wait queue. */ |
1828 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 1829 | &wait_queue.head, head) { |
d88aee68 | 1830 | cds_list_del(&wait_node->head); |
f45e313d | 1831 | wait_queue.count--; |
d88aee68 DG |
1832 | free(wait_node); |
1833 | } | |
1834 | ||
099e26bd | 1835 | DBG("Dispatch thread dying"); |
12e2b881 MD |
1836 | if (err) { |
1837 | health_error(); | |
1838 | ERR("Health error occurred in %s", __func__); | |
1839 | } | |
8782cc74 | 1840 | health_unregister(health_sessiond); |
099e26bd DG |
1841 | return NULL; |
1842 | } | |
1843 | ||
1844 | /* | |
1845 | * This thread manage application registration. | |
1846 | */ | |
1847 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1848 | { |
139ac872 | 1849 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1850 | uint32_t revents, nb_fd; |
1851 | struct lttng_poll_event events; | |
099e26bd DG |
1852 | /* |
1853 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1854 | * freed in the manage apps thread. | |
1855 | */ | |
1856 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1857 | |
099e26bd | 1858 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1859 | |
6c71277b | 1860 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG); |
927ca06a | 1861 | |
e547b070 | 1862 | if (testpoint(sessiond_thread_registration_apps)) { |
6993eeb3 CB |
1863 | goto error_testpoint; |
1864 | } | |
8ac94142 | 1865 | |
1d4b027a DG |
1866 | ret = lttcomm_listen_unix_sock(apps_sock); |
1867 | if (ret < 0) { | |
76d7553f | 1868 | goto error_listen; |
1d4b027a DG |
1869 | } |
1870 | ||
5eb91c98 DG |
1871 | /* |
1872 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1873 | * more will be added to this poll set. | |
1874 | */ | |
d0b96690 | 1875 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1876 | if (ret < 0) { |
76d7553f | 1877 | goto error_create_poll; |
5eb91c98 | 1878 | } |
273ea72c | 1879 | |
5eb91c98 DG |
1880 | /* Add the application registration socket */ |
1881 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1882 | if (ret < 0) { | |
76d7553f | 1883 | goto error_poll_add; |
5eb91c98 | 1884 | } |
273ea72c | 1885 | |
1d4b027a | 1886 | /* Notify all applications to register */ |
0fdd1e2c DG |
1887 | ret = notify_ust_apps(1); |
1888 | if (ret < 0) { | |
1889 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1890 | "Execution continues but there might be problem for already\n" |
1891 | "running applications that wishes to register."); | |
0fdd1e2c | 1892 | } |
1d4b027a DG |
1893 | |
1894 | while (1) { | |
1895 | DBG("Accepting application registration"); | |
273ea72c DG |
1896 | |
1897 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1898 | restart: |
a78af745 | 1899 | health_poll_entry(); |
5eb91c98 | 1900 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1901 | health_poll_exit(); |
273ea72c | 1902 | if (ret < 0) { |
88f2b785 MD |
1903 | /* |
1904 | * Restart interrupted system call. | |
1905 | */ | |
1906 | if (errno == EINTR) { | |
1907 | goto restart; | |
1908 | } | |
273ea72c DG |
1909 | goto error; |
1910 | } | |
1911 | ||
0d9c5d77 DG |
1912 | nb_fd = ret; |
1913 | ||
5eb91c98 | 1914 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 1915 | health_code_update(); |
139ac872 | 1916 | |
5eb91c98 DG |
1917 | /* Fetch once the poll data */ |
1918 | revents = LTTNG_POLL_GETEV(&events, i); | |
1919 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1920 | |
5eb91c98 | 1921 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1922 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1923 | if (ret) { |
139ac872 MD |
1924 | err = 0; |
1925 | goto exit; | |
90014c57 | 1926 | } |
1d4b027a | 1927 | |
5eb91c98 DG |
1928 | /* Event on the registration socket */ |
1929 | if (pollfd == apps_sock) { | |
1930 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1931 | ERR("Register apps socket poll error"); | |
1932 | goto error; | |
1933 | } else if (revents & LPOLLIN) { | |
1934 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1935 | if (sock < 0) { | |
1936 | goto error; | |
1937 | } | |
099e26bd | 1938 | |
16c5c8fa DG |
1939 | /* |
1940 | * Set socket timeout for both receiving and ending. | |
1941 | * app_socket_timeout is in seconds, whereas | |
1942 | * lttcomm_setsockopt_rcv_timeout and | |
1943 | * lttcomm_setsockopt_snd_timeout expect msec as | |
1944 | * parameter. | |
1945 | */ | |
1946 | (void) lttcomm_setsockopt_rcv_timeout(sock, | |
1947 | app_socket_timeout * 1000); | |
1948 | (void) lttcomm_setsockopt_snd_timeout(sock, | |
1949 | app_socket_timeout * 1000); | |
1950 | ||
b662582b DG |
1951 | /* |
1952 | * Set the CLOEXEC flag. Return code is useless because | |
1953 | * either way, the show must go on. | |
1954 | */ | |
1955 | (void) utils_set_fd_cloexec(sock); | |
1956 | ||
5eb91c98 | 1957 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1958 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1959 | if (ust_cmd == NULL) { |
76d7553f | 1960 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1961 | goto error; |
1962 | } | |
1d4b027a | 1963 | |
5eb91c98 DG |
1964 | /* |
1965 | * Using message-based transmissions to ensure we don't | |
1966 | * have to deal with partially received messages. | |
1967 | */ | |
4063050c MD |
1968 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1969 | if (ret < 0) { | |
1970 | ERR("Exhausted file descriptors allowed for applications."); | |
1971 | free(ust_cmd); | |
1972 | ret = close(sock); | |
1973 | if (ret) { | |
1974 | PERROR("close"); | |
1975 | } | |
1976 | sock = -1; | |
1977 | continue; | |
1978 | } | |
d88aee68 | 1979 | |
840cb59c | 1980 | health_code_update(); |
d0b96690 DG |
1981 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
1982 | if (ret < 0) { | |
5eb91c98 | 1983 | free(ust_cmd); |
d0b96690 | 1984 | /* Close socket of the application. */ |
76d7553f MD |
1985 | ret = close(sock); |
1986 | if (ret) { | |
1987 | PERROR("close"); | |
1988 | } | |
4063050c | 1989 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1990 | sock = -1; |
5eb91c98 DG |
1991 | continue; |
1992 | } | |
840cb59c | 1993 | health_code_update(); |
099e26bd | 1994 | |
5eb91c98 | 1995 | ust_cmd->sock = sock; |
34a2494f | 1996 | sock = -1; |
099e26bd | 1997 | |
5eb91c98 DG |
1998 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1999 | " gid:%d sock:%d name:%s (version %d.%d)", | |
2000 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
2001 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
2002 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
2003 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 2004 | |
5eb91c98 DG |
2005 | /* |
2006 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 2007 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
2008 | */ |
2009 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
2010 | ||
2011 | /* | |
2012 | * Wake the registration queue futex. Implicit memory | |
2013 | * barrier with the exchange in cds_wfq_enqueue. | |
2014 | */ | |
2015 | futex_nto1_wake(&ust_cmd_queue.futex); | |
2016 | } | |
2017 | } | |
90014c57 | 2018 | } |
1d4b027a DG |
2019 | } |
2020 | ||
139ac872 | 2021 | exit: |
1d4b027a | 2022 | error: |
139ac872 | 2023 | if (err) { |
840cb59c | 2024 | health_error(); |
139ac872 MD |
2025 | ERR("Health error occurred in %s", __func__); |
2026 | } | |
139ac872 | 2027 | |
0fdd1e2c DG |
2028 | /* Notify that the registration thread is gone */ |
2029 | notify_ust_apps(0); | |
2030 | ||
a4b35e07 | 2031 | if (apps_sock >= 0) { |
76d7553f MD |
2032 | ret = close(apps_sock); |
2033 | if (ret) { | |
2034 | PERROR("close"); | |
2035 | } | |
a4b35e07 | 2036 | } |
46c3f085 | 2037 | if (sock >= 0) { |
76d7553f MD |
2038 | ret = close(sock); |
2039 | if (ret) { | |
2040 | PERROR("close"); | |
2041 | } | |
4063050c | 2042 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 2043 | } |
273ea72c | 2044 | unlink(apps_unix_sock_path); |
0fdd1e2c | 2045 | |
76d7553f | 2046 | error_poll_add: |
5eb91c98 | 2047 | lttng_poll_clean(&events); |
76d7553f MD |
2048 | error_listen: |
2049 | error_create_poll: | |
6993eeb3 | 2050 | error_testpoint: |
76d7553f | 2051 | DBG("UST Registration thread cleanup complete"); |
8782cc74 | 2052 | health_unregister(health_sessiond); |
5eb91c98 | 2053 | |
1d4b027a DG |
2054 | return NULL; |
2055 | } | |
2056 | ||
8c0faa1d | 2057 | /* |
3bd1e081 | 2058 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 2059 | * exec or it will fails. |
8c0faa1d | 2060 | */ |
3bd1e081 | 2061 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 2062 | { |
a23ec3a7 | 2063 | int ret, clock_ret; |
ee0b0061 DG |
2064 | struct timespec timeout; |
2065 | ||
a23ec3a7 DG |
2066 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
2067 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 2068 | |
a23ec3a7 DG |
2069 | /* Setup pthread condition */ |
2070 | ret = pthread_condattr_init(&consumer_data->condattr); | |
2071 | if (ret != 0) { | |
2072 | errno = ret; | |
2073 | PERROR("pthread_condattr_init consumer data"); | |
2074 | goto error; | |
2075 | } | |
2076 | ||
2077 | /* | |
2078 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
2079 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
2080 | * for a more details and how we noticed it. | |
2081 | */ | |
2082 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
2083 | if (ret != 0) { | |
2084 | errno = ret; | |
2085 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
2086 | goto error; |
2087 | } | |
8c0faa1d | 2088 | |
a23ec3a7 DG |
2089 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
2090 | if (ret != 0) { | |
2091 | errno = ret; | |
2092 | PERROR("pthread_cond_init consumer data"); | |
2093 | goto error; | |
2094 | } | |
2095 | ||
2096 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
2097 | consumer_data); | |
8c0faa1d | 2098 | if (ret != 0) { |
3bd1e081 | 2099 | PERROR("pthread_create consumer"); |
ee0b0061 | 2100 | ret = -1; |
8c0faa1d DG |
2101 | goto error; |
2102 | } | |
2103 | ||
a23ec3a7 DG |
2104 | /* We are about to wait on a pthread condition */ |
2105 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
2106 | ||
ee0b0061 | 2107 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
2108 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
2109 | /* | |
2110 | * Set the timeout for the condition timed wait even if the clock gettime | |
2111 | * call fails since we might loop on that call and we want to avoid to | |
2112 | * increment the timeout too many times. | |
2113 | */ | |
2114 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
2115 | ||
2116 | /* | |
2117 | * The following loop COULD be skipped in some conditions so this is why we | |
2118 | * set ret to 0 in order to make sure at least one round of the loop is | |
2119 | * done. | |
2120 | */ | |
2121 | ret = 0; | |
2122 | ||
2123 | /* | |
2124 | * Loop until the condition is reached or when a timeout is reached. Note | |
2125 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
2126 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
2127 | * possible. This loop does not take any chances and works with both of | |
2128 | * them. | |
2129 | */ | |
2130 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
2131 | if (clock_ret < 0) { | |
2132 | PERROR("clock_gettime spawn consumer"); | |
2133 | /* Infinite wait for the consumerd thread to be ready */ | |
2134 | ret = pthread_cond_wait(&consumer_data->cond, | |
2135 | &consumer_data->cond_mutex); | |
2136 | } else { | |
2137 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
2138 | &consumer_data->cond_mutex, &timeout); | |
2139 | } | |
ee0b0061 | 2140 | } |
8c0faa1d | 2141 | |
a23ec3a7 DG |
2142 | /* Release the pthread condition */ |
2143 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
2144 | ||
2145 | if (ret != 0) { | |
2146 | errno = ret; | |
2147 | if (ret == ETIMEDOUT) { | |
ee0b0061 DG |
2148 | /* |
2149 | * Call has timed out so we kill the kconsumerd_thread and return | |
2150 | * an error. | |
2151 | */ | |
a23ec3a7 DG |
2152 | ERR("Condition timed out. The consumer thread was never ready." |
2153 | " Killing it"); | |
3bd1e081 | 2154 | ret = pthread_cancel(consumer_data->thread); |
ee0b0061 | 2155 | if (ret < 0) { |
3bd1e081 | 2156 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
2157 | } |
2158 | } else { | |
a23ec3a7 | 2159 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 DG |
2160 | } |
2161 | goto error; | |
2162 | } | |
2163 | ||
3bd1e081 MD |
2164 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2165 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2166 | ERR("Consumerd did not start"); |
3bd1e081 | 2167 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2168 | goto error; |
2169 | } | |
3bd1e081 | 2170 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2171 | |
8c0faa1d DG |
2172 | return 0; |
2173 | ||
2174 | error: | |
2175 | return ret; | |
2176 | } | |
2177 | ||
d9800920 | 2178 | /* |
3bd1e081 | 2179 | * Join consumer thread |
d9800920 | 2180 | */ |
3bd1e081 | 2181 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2182 | { |
2183 | void *status; | |
cf3af59e | 2184 | |
e8209f6b DG |
2185 | /* Consumer pid must be a real one. */ |
2186 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2187 | int ret; |
3bd1e081 | 2188 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2189 | if (ret) { |
3bd1e081 | 2190 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
2191 | return ret; |
2192 | } | |
3bd1e081 | 2193 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2194 | } else { |
2195 | return 0; | |
2196 | } | |
2197 | } | |
2198 | ||
8c0faa1d | 2199 | /* |
3bd1e081 | 2200 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2201 | * |
d063d709 | 2202 | * Return pid if successful else -1. |
8c0faa1d | 2203 | */ |
3bd1e081 | 2204 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2205 | { |
2206 | int ret; | |
2207 | pid_t pid; | |
94c55f17 | 2208 | const char *consumer_to_use; |
53086306 | 2209 | const char *verbosity; |
94c55f17 | 2210 | struct stat st; |
8c0faa1d | 2211 | |
3bd1e081 | 2212 | DBG("Spawning consumerd"); |
c49dc785 | 2213 | |
8c0faa1d DG |
2214 | pid = fork(); |
2215 | if (pid == 0) { | |
2216 | /* | |
3bd1e081 | 2217 | * Exec consumerd. |
8c0faa1d | 2218 | */ |
daee5345 | 2219 | if (opt_verbose_consumer) { |
53086306 DG |
2220 | verbosity = "--verbose"; |
2221 | } else { | |
2222 | verbosity = "--quiet"; | |
2223 | } | |
3bd1e081 MD |
2224 | switch (consumer_data->type) { |
2225 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2226 | /* |
c7704d57 DG |
2227 | * Find out which consumerd to execute. We will first try the |
2228 | * 64-bit path, then the sessiond's installation directory, and | |
2229 | * fallback on the 32-bit one, | |
94c55f17 | 2230 | */ |
63a799e8 AM |
2231 | DBG3("Looking for a kernel consumer at these locations:"); |
2232 | DBG3(" 1) %s", consumerd64_bin); | |
2233 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
2234 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 2235 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 2236 | DBG3("Found location #1"); |
94c55f17 | 2237 | consumer_to_use = consumerd64_bin; |
94c55f17 | 2238 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 2239 | DBG3("Found location #2"); |
94c55f17 | 2240 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 2241 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 2242 | DBG3("Found location #3"); |
eb1e0bd4 | 2243 | consumer_to_use = consumerd32_bin; |
94c55f17 | 2244 | } else { |
63a799e8 | 2245 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
2246 | break; |
2247 | } | |
2248 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
2249 | execl(consumer_to_use, | |
2250 | "lttng-consumerd", verbosity, "-k", | |
2251 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2252 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2253 | "--group", tracing_group_name, |
94c55f17 | 2254 | NULL); |
3bd1e081 | 2255 | break; |
7753dea8 MD |
2256 | case LTTNG_CONSUMER64_UST: |
2257 | { | |
b1e0b6b6 | 2258 | char *tmpnew = NULL; |
8f4905da MD |
2259 | |
2260 | if (consumerd64_libdir[0] != '\0') { | |
2261 | char *tmp; | |
2262 | size_t tmplen; | |
2263 | ||
2264 | tmp = getenv("LD_LIBRARY_PATH"); | |
2265 | if (!tmp) { | |
2266 | tmp = ""; | |
2267 | } | |
2268 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2269 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
2270 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2271 | if (!tmpnew) { | |
2272 | ret = -ENOMEM; | |
2273 | goto error; | |
2274 | } | |
2275 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2276 | strcat(tmpnew, consumerd64_libdir); | |
2277 | if (tmp[0] != '\0') { | |
2278 | strcat(tmpnew, ":"); | |
2279 | strcat(tmpnew, tmp); | |
2280 | } | |
2281 | ret = putenv(tmpnew); | |
2282 | if (ret) { | |
2283 | ret = -errno; | |
c6f76da9 | 2284 | free(tmpnew); |
8f4905da MD |
2285 | goto error; |
2286 | } | |
2287 | } | |
94c55f17 | 2288 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 2289 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2290 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2291 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2292 | "--group", tracing_group_name, |
7753dea8 | 2293 | NULL); |
8f4905da MD |
2294 | if (consumerd64_libdir[0] != '\0') { |
2295 | free(tmpnew); | |
2296 | } | |
2297 | if (ret) { | |
2298 | goto error; | |
2299 | } | |
3bd1e081 | 2300 | break; |
7753dea8 MD |
2301 | } |
2302 | case LTTNG_CONSUMER32_UST: | |
2303 | { | |
937dde8e | 2304 | char *tmpnew = NULL; |
8f4905da MD |
2305 | |
2306 | if (consumerd32_libdir[0] != '\0') { | |
2307 | char *tmp; | |
2308 | size_t tmplen; | |
2309 | ||
2310 | tmp = getenv("LD_LIBRARY_PATH"); | |
2311 | if (!tmp) { | |
2312 | tmp = ""; | |
2313 | } | |
2314 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2315 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
2316 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2317 | if (!tmpnew) { | |
2318 | ret = -ENOMEM; | |
2319 | goto error; | |
2320 | } | |
2321 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2322 | strcat(tmpnew, consumerd32_libdir); | |
2323 | if (tmp[0] != '\0') { | |
2324 | strcat(tmpnew, ":"); | |
2325 | strcat(tmpnew, tmp); | |
2326 | } | |
2327 | ret = putenv(tmpnew); | |
2328 | if (ret) { | |
2329 | ret = -errno; | |
c6f76da9 | 2330 | free(tmpnew); |
8f4905da MD |
2331 | goto error; |
2332 | } | |
2333 | } | |
94c55f17 | 2334 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 2335 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2336 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2337 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2338 | "--group", tracing_group_name, |
7753dea8 | 2339 | NULL); |
8f4905da MD |
2340 | if (consumerd32_libdir[0] != '\0') { |
2341 | free(tmpnew); | |
2342 | } | |
2343 | if (ret) { | |
2344 | goto error; | |
2345 | } | |
7753dea8 MD |
2346 | break; |
2347 | } | |
3bd1e081 | 2348 | default: |
76d7553f | 2349 | PERROR("unknown consumer type"); |
3bd1e081 MD |
2350 | exit(EXIT_FAILURE); |
2351 | } | |
8c0faa1d | 2352 | if (errno != 0) { |
76d7553f | 2353 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
2354 | } |
2355 | exit(EXIT_FAILURE); | |
2356 | } else if (pid > 0) { | |
2357 | ret = pid; | |
8c0faa1d | 2358 | } else { |
76d7553f | 2359 | PERROR("start consumer fork"); |
8c0faa1d | 2360 | ret = -errno; |
8c0faa1d | 2361 | } |
8f4905da | 2362 | error: |
8c0faa1d DG |
2363 | return ret; |
2364 | } | |
2365 | ||
693bd40b | 2366 | /* |
3bd1e081 | 2367 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2368 | */ |
3bd1e081 | 2369 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2370 | { |
c617c0c6 | 2371 | int ret; |
edb8b045 DG |
2372 | |
2373 | /* | |
2374 | * Set the listen() state on the socket since there is a possible race | |
2375 | * between the exec() of the consumer daemon and this call if place in the | |
2376 | * consumer thread. See bug #366 for more details. | |
2377 | */ | |
2378 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2379 | if (ret < 0) { | |
2380 | goto error; | |
2381 | } | |
693bd40b | 2382 | |
3bd1e081 MD |
2383 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2384 | if (consumer_data->pid != 0) { | |
2385 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2386 | goto end; |
2387 | } | |
693bd40b | 2388 | |
3bd1e081 | 2389 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2390 | if (ret < 0) { |
3bd1e081 MD |
2391 | ERR("Spawning consumerd failed"); |
2392 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2393 | goto error; |
693bd40b | 2394 | } |
c49dc785 | 2395 | |
3bd1e081 MD |
2396 | /* Setting up the consumer_data pid */ |
2397 | consumer_data->pid = ret; | |
48842b30 | 2398 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2399 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2400 | |
3bd1e081 MD |
2401 | DBG2("Spawning consumer control thread"); |
2402 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2403 | if (ret < 0) { |
3bd1e081 | 2404 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2405 | goto error; |
2406 | } | |
2407 | ||
c49dc785 | 2408 | end: |
693bd40b DG |
2409 | return 0; |
2410 | ||
2411 | error: | |
331744e3 | 2412 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2413 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2414 | int err; |
2415 | ||
edb8b045 DG |
2416 | err = close(consumer_data->err_sock); |
2417 | if (err < 0) { | |
2418 | PERROR("close consumer data error socket"); | |
2419 | } | |
2420 | } | |
693bd40b DG |
2421 | return ret; |
2422 | } | |
2423 | ||
b73401da | 2424 | /* |
096102bd | 2425 | * Setup necessary data for kernel tracer action. |
b73401da | 2426 | */ |
096102bd | 2427 | static int init_kernel_tracer(void) |
b73401da DG |
2428 | { |
2429 | int ret; | |
b73401da | 2430 | |
096102bd DG |
2431 | /* Modprobe lttng kernel modules */ |
2432 | ret = modprobe_lttng_control(); | |
b73401da | 2433 | if (ret < 0) { |
b73401da DG |
2434 | goto error; |
2435 | } | |
2436 | ||
096102bd DG |
2437 | /* Open debugfs lttng */ |
2438 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2439 | if (kernel_tracer_fd < 0) { | |
2440 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
2441 | ret = -1; |
2442 | goto error_open; | |
54d01ffb DG |
2443 | } |
2444 | ||
2f77fc4b DG |
2445 | /* Validate kernel version */ |
2446 | ret = kernel_validate_version(kernel_tracer_fd); | |
2447 | if (ret < 0) { | |
2448 | goto error_version; | |
b551a063 | 2449 | } |
54d01ffb | 2450 | |
2f77fc4b DG |
2451 | ret = modprobe_lttng_data(); |
2452 | if (ret < 0) { | |
2453 | goto error_modules; | |
54d01ffb DG |
2454 | } |
2455 | ||
2f77fc4b DG |
2456 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2457 | return 0; | |
2458 | ||
2459 | error_version: | |
2460 | modprobe_remove_lttng_control(); | |
2461 | ret = close(kernel_tracer_fd); | |
2462 | if (ret) { | |
2463 | PERROR("close"); | |
b551a063 | 2464 | } |
2f77fc4b | 2465 | kernel_tracer_fd = -1; |
f73fabfd | 2466 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2467 | |
2f77fc4b DG |
2468 | error_modules: |
2469 | ret = close(kernel_tracer_fd); | |
2470 | if (ret) { | |
2471 | PERROR("close"); | |
b551a063 | 2472 | } |
54d01ffb | 2473 | |
2f77fc4b DG |
2474 | error_open: |
2475 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2476 | |
2477 | error: | |
2f77fc4b DG |
2478 | WARN("No kernel tracer available"); |
2479 | kernel_tracer_fd = -1; | |
2480 | if (!is_root) { | |
f73fabfd | 2481 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2482 | } else { |
f73fabfd | 2483 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2484 | } |
54d01ffb DG |
2485 | } |
2486 | ||
2f77fc4b | 2487 | |
54d01ffb | 2488 | /* |
2f77fc4b DG |
2489 | * Copy consumer output from the tracing session to the domain session. The |
2490 | * function also applies the right modification on a per domain basis for the | |
2491 | * trace files destination directory. | |
36b588ed MD |
2492 | * |
2493 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2494 | */ |
2f77fc4b | 2495 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2496 | { |
2497 | int ret; | |
2f77fc4b DG |
2498 | const char *dir_name; |
2499 | struct consumer_output *consumer; | |
2500 | ||
2501 | assert(session); | |
2502 | assert(session->consumer); | |
54d01ffb | 2503 | |
b551a063 DG |
2504 | switch (domain) { |
2505 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2506 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2507 | /* |
2508 | * XXX: We should audit the session creation and what this function | |
2509 | * does "extra" in order to avoid a destroy since this function is used | |
2510 | * in the domain session creation (kernel and ust) only. Same for UST | |
2511 | * domain. | |
2512 | */ | |
2513 | if (session->kernel_session->consumer) { | |
2514 | consumer_destroy_output(session->kernel_session->consumer); | |
2515 | } | |
2f77fc4b DG |
2516 | session->kernel_session->consumer = |
2517 | consumer_copy_output(session->consumer); | |
2518 | /* Ease our life a bit for the next part */ | |
2519 | consumer = session->kernel_session->consumer; | |
2520 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 | 2521 | break; |
f20baf8e | 2522 | case LTTNG_DOMAIN_JUL: |
b551a063 | 2523 | case LTTNG_DOMAIN_UST: |
2f77fc4b | 2524 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2525 | if (session->ust_session->consumer) { |
2526 | consumer_destroy_output(session->ust_session->consumer); | |
2527 | } | |
2f77fc4b DG |
2528 | session->ust_session->consumer = |
2529 | consumer_copy_output(session->consumer); | |
2530 | /* Ease our life a bit for the next part */ | |
2531 | consumer = session->ust_session->consumer; | |
2532 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2533 | break; |
2534 | default: | |
f73fabfd | 2535 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2536 | goto error; |
2537 | } | |
2538 | ||
2f77fc4b | 2539 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2540 | strncat(consumer->subdir, dir_name, |
2541 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2542 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2543 | ||
f73fabfd | 2544 | ret = LTTNG_OK; |
54d01ffb DG |
2545 | |
2546 | error: | |
2547 | return ret; | |
2548 | } | |
2549 | ||
00e2e675 | 2550 | /* |
2f77fc4b | 2551 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2552 | * |
2553 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2554 | */ |
2f77fc4b DG |
2555 | static int create_ust_session(struct ltt_session *session, |
2556 | struct lttng_domain *domain) | |
00e2e675 DG |
2557 | { |
2558 | int ret; | |
2f77fc4b | 2559 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2560 | |
a4b92340 | 2561 | assert(session); |
2f77fc4b DG |
2562 | assert(domain); |
2563 | assert(session->consumer); | |
a4b92340 | 2564 | |
2f77fc4b | 2565 | switch (domain->type) { |
f20baf8e | 2566 | case LTTNG_DOMAIN_JUL: |
2f77fc4b DG |
2567 | case LTTNG_DOMAIN_UST: |
2568 | break; | |
2569 | default: | |
2570 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2571 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2572 | goto error; |
2573 | } | |
2574 | ||
2f77fc4b DG |
2575 | DBG("Creating UST session"); |
2576 | ||
dec56f6c | 2577 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2578 | if (lus == NULL) { |
f73fabfd | 2579 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2580 | goto error; |
2581 | } | |
2582 | ||
2f77fc4b DG |
2583 | lus->uid = session->uid; |
2584 | lus->gid = session->gid; | |
2bba9e53 | 2585 | lus->output_traces = session->output_traces; |
27babd3a | 2586 | lus->snapshot_mode = session->snapshot_mode; |
ecc48a90 | 2587 | lus->live_timer_interval = session->live_timer; |
2f77fc4b | 2588 | session->ust_session = lus; |
00e2e675 | 2589 | |
2f77fc4b DG |
2590 | /* Copy session output to the newly created UST session */ |
2591 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2592 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2593 | goto error; |
2594 | } | |
2595 | ||
f73fabfd | 2596 | return LTTNG_OK; |
00e2e675 DG |
2597 | |
2598 | error: | |
2f77fc4b DG |
2599 | free(lus); |
2600 | session->ust_session = NULL; | |
00e2e675 DG |
2601 | return ret; |
2602 | } | |
2603 | ||
2604 | /* | |
2f77fc4b | 2605 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2606 | */ |
2f77fc4b | 2607 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2608 | { |
2609 | int ret; | |
a4b92340 | 2610 | |
2f77fc4b | 2611 | DBG("Creating kernel session"); |
00e2e675 | 2612 | |
2f77fc4b DG |
2613 | ret = kernel_create_session(session, kernel_tracer_fd); |
2614 | if (ret < 0) { | |
f73fabfd | 2615 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2616 | goto error; |
2617 | } | |
2618 | ||
2f77fc4b DG |
2619 | /* Code flow safety */ |
2620 | assert(session->kernel_session); | |
2621 | ||
2622 | /* Copy session output to the newly created Kernel session */ | |
2623 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2624 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2625 | goto error; |
2626 | } | |
2627 | ||
2f77fc4b DG |
2628 | /* Create directory(ies) on local filesystem. */ |
2629 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2630 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2631 | ret = run_as_mkdir_recursive( | |
2632 | session->kernel_session->consumer->dst.trace_path, | |
2633 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2634 | if (ret < 0) { | |
2635 | if (ret != -EEXIST) { | |
2636 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2637 | goto error; |
2638 | } | |
00e2e675 | 2639 | } |
2f77fc4b | 2640 | } |
00e2e675 | 2641 | |
2f77fc4b DG |
2642 | session->kernel_session->uid = session->uid; |
2643 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2644 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2645 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2646 | |
f73fabfd | 2647 | return LTTNG_OK; |
00e2e675 | 2648 | |
2f77fc4b DG |
2649 | error: |
2650 | trace_kernel_destroy_session(session->kernel_session); | |
2651 | session->kernel_session = NULL; | |
2652 | return ret; | |
2653 | } | |
00e2e675 | 2654 | |
2f77fc4b DG |
2655 | /* |
2656 | * Count number of session permitted by uid/gid. | |
2657 | */ | |
2658 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2659 | { | |
2660 | unsigned int i = 0; | |
2661 | struct ltt_session *session; | |
07424f16 | 2662 | |
2f77fc4b DG |
2663 | DBG("Counting number of available session for UID %d GID %d", |
2664 | uid, gid); | |
2665 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2666 | /* |
2f77fc4b | 2667 | * Only list the sessions the user can control. |
00e2e675 | 2668 | */ |
2f77fc4b DG |
2669 | if (!session_access_ok(session, uid, gid)) { |
2670 | continue; | |
2671 | } | |
2672 | i++; | |
a4b92340 | 2673 | } |
2f77fc4b | 2674 | return i; |
00e2e675 DG |
2675 | } |
2676 | ||
54d01ffb DG |
2677 | /* |
2678 | * Process the command requested by the lttng client within the command | |
2679 | * context structure. This function make sure that the return structure (llm) | |
2680 | * is set and ready for transmission before returning. | |
2681 | * | |
2682 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2683 | * |
2684 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
2685 | * |
2686 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2687 | */ |
53a80697 MD |
2688 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2689 | int *sock_error) | |
54d01ffb | 2690 | { |
f73fabfd | 2691 | int ret = LTTNG_OK; |
44d3bd01 | 2692 | int need_tracing_session = 1; |
2e09ba09 | 2693 | int need_domain; |
54d01ffb DG |
2694 | |
2695 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2696 | ||
53a80697 MD |
2697 | *sock_error = 0; |
2698 | ||
2e09ba09 MD |
2699 | switch (cmd_ctx->lsm->cmd_type) { |
2700 | case LTTNG_CREATE_SESSION: | |
27babd3a | 2701 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2702 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 MD |
2703 | case LTTNG_DESTROY_SESSION: |
2704 | case LTTNG_LIST_SESSIONS: | |
2705 | case LTTNG_LIST_DOMAINS: | |
2706 | case LTTNG_START_TRACE: | |
2707 | case LTTNG_STOP_TRACE: | |
6d805429 | 2708 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
2709 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
2710 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2711 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2712 | case LTTNG_SNAPSHOT_RECORD: | |
2e09ba09 | 2713 | need_domain = 0; |
3aace903 | 2714 | break; |
2e09ba09 MD |
2715 | default: |
2716 | need_domain = 1; | |
2717 | } | |
2718 | ||
2719 | if (opt_no_kernel && need_domain | |
2720 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2721 | if (!is_root) { |
f73fabfd | 2722 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2723 | } else { |
f73fabfd | 2724 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2725 | } |
4fba7219 DG |
2726 | goto error; |
2727 | } | |
2728 | ||
8d3113b2 DG |
2729 | /* Deny register consumer if we already have a spawned consumer. */ |
2730 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2731 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2732 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2733 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2734 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2735 | goto error; |
2736 | } | |
2737 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2738 | } | |
2739 | ||
54d01ffb DG |
2740 | /* |
2741 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2742 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2743 | * command. |
2744 | */ | |
2745 | switch(cmd_ctx->lsm->cmd_type) { | |
2746 | case LTTNG_LIST_SESSIONS: | |
2747 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2748 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2749 | case LTTNG_LIST_DOMAINS: |
2750 | case LTTNG_LIST_CHANNELS: | |
2751 | case LTTNG_LIST_EVENTS: | |
2752 | break; | |
2753 | default: | |
2754 | /* Setup lttng message with no payload */ | |
2755 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2756 | if (ret < 0) { | |
2757 | /* This label does not try to unlock the session */ | |
2758 | goto init_setup_error; | |
2759 | } | |
2760 | } | |
2761 | ||
2762 | /* Commands that DO NOT need a session. */ | |
2763 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2764 | case LTTNG_CREATE_SESSION: |
27babd3a | 2765 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2766 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 | 2767 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2768 | case LTTNG_LIST_SESSIONS: |
2769 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2770 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2771 | need_tracing_session = 0; |
54d01ffb DG |
2772 | break; |
2773 | default: | |
2774 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2775 | /* |
2776 | * We keep the session list lock across _all_ commands | |
2777 | * for now, because the per-session lock does not | |
2778 | * handle teardown properly. | |
2779 | */ | |
74babd95 | 2780 | session_lock_list(); |
54d01ffb DG |
2781 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2782 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 2783 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2784 | goto error; |
2785 | } else { | |
2786 | /* Acquire lock for the session */ | |
2787 | session_lock(cmd_ctx->session); | |
2788 | } | |
2789 | break; | |
2790 | } | |
b389abbe | 2791 | |
2e09ba09 MD |
2792 | if (!need_domain) { |
2793 | goto skip_domain; | |
2794 | } | |
a4b92340 | 2795 | |
54d01ffb DG |
2796 | /* |
2797 | * Check domain type for specific "pre-action". | |
2798 | */ | |
2799 | switch (cmd_ctx->lsm->domain.type) { | |
2800 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2801 | if (!is_root) { |
f73fabfd | 2802 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2803 | goto error; |
2804 | } | |
2805 | ||
54d01ffb | 2806 | /* Kernel tracer check */ |
a4b35e07 | 2807 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2808 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2809 | ret = init_kernel_tracer(); |
2810 | if (ret != 0) { | |
54d01ffb DG |
2811 | goto error; |
2812 | } | |
2813 | } | |
5eb91c98 | 2814 | |
5c827ce0 DG |
2815 | /* Consumer is in an ERROR state. Report back to client */ |
2816 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2817 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2818 | goto error; |
2819 | } | |
2820 | ||
54d01ffb | 2821 | /* Need a session for kernel command */ |
44d3bd01 | 2822 | if (need_tracing_session) { |
54d01ffb | 2823 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2824 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2825 | if (ret < 0) { |
f73fabfd | 2826 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2827 | goto error; |
2828 | } | |
b389abbe | 2829 | } |
7d29a247 | 2830 | |
54d01ffb | 2831 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2832 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2833 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 2834 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
2835 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2836 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2837 | if (ret < 0) { |
f73fabfd | 2838 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2839 | goto error; |
950131af | 2840 | } |
5c827ce0 | 2841 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2842 | } else { |
2843 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2844 | } |
173af62f | 2845 | |
a4b92340 DG |
2846 | /* |
2847 | * The consumer was just spawned so we need to add the socket to | |
2848 | * the consumer output of the session if exist. | |
2849 | */ | |
2850 | ret = consumer_create_socket(&kconsumer_data, | |
2851 | cmd_ctx->session->kernel_session->consumer); | |
2852 | if (ret < 0) { | |
2853 | goto error; | |
173af62f | 2854 | } |
0d0c377a | 2855 | } |
5c827ce0 | 2856 | |
54d01ffb | 2857 | break; |
b9dfb167 | 2858 | case LTTNG_DOMAIN_JUL: |
2bdd86d4 | 2859 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2860 | { |
b51ec5b4 MD |
2861 | if (!ust_app_supported()) { |
2862 | ret = LTTNG_ERR_NO_UST; | |
2863 | goto error; | |
2864 | } | |
5c827ce0 DG |
2865 | /* Consumer is in an ERROR state. Report back to client */ |
2866 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2867 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2868 | goto error; |
2869 | } | |
2870 | ||
44d3bd01 | 2871 | if (need_tracing_session) { |
a4b92340 | 2872 | /* Create UST session if none exist. */ |
f6a9efaa | 2873 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2874 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2875 | &cmd_ctx->lsm->domain); |
f73fabfd | 2876 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2877 | goto error; |
2878 | } | |
2879 | } | |
00e2e675 | 2880 | |
7753dea8 MD |
2881 | /* Start the UST consumer daemons */ |
2882 | /* 64-bit */ | |
2883 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2884 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2885 | ustconsumer64_data.pid == 0 && |
785d2d0d | 2886 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2887 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2888 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2889 | if (ret < 0) { |
f73fabfd | 2890 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2891 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2892 | goto error; |
2893 | } | |
48842b30 | 2894 | |
173af62f | 2895 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2896 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2897 | } else { |
7753dea8 MD |
2898 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2899 | } | |
173af62f DG |
2900 | |
2901 | /* | |
2902 | * Setup socket for consumer 64 bit. No need for atomic access | |
2903 | * since it was set above and can ONLY be set in this thread. | |
2904 | */ | |
a4b92340 DG |
2905 | ret = consumer_create_socket(&ustconsumer64_data, |
2906 | cmd_ctx->session->ust_session->consumer); | |
2907 | if (ret < 0) { | |
2908 | goto error; | |
173af62f DG |
2909 | } |
2910 | ||
7753dea8 | 2911 | /* 32-bit */ |
fc7a59ce | 2912 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2913 | ustconsumer32_data.pid == 0 && |
785d2d0d | 2914 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2915 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2916 | ret = start_consumerd(&ustconsumer32_data); | |
2917 | if (ret < 0) { | |
f73fabfd | 2918 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2919 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2920 | goto error; |
2921 | } | |
5c827ce0 | 2922 | |
173af62f | 2923 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2924 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2925 | } else { |
2926 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2927 | } |
173af62f DG |
2928 | |
2929 | /* | |
2930 | * Setup socket for consumer 64 bit. No need for atomic access | |
2931 | * since it was set above and can ONLY be set in this thread. | |
2932 | */ | |
a4b92340 DG |
2933 | ret = consumer_create_socket(&ustconsumer32_data, |
2934 | cmd_ctx->session->ust_session->consumer); | |
2935 | if (ret < 0) { | |
2936 | goto error; | |
173af62f | 2937 | } |
44d3bd01 DG |
2938 | } |
2939 | break; | |
48842b30 | 2940 | } |
54d01ffb | 2941 | default: |
54d01ffb DG |
2942 | break; |
2943 | } | |
2e09ba09 | 2944 | skip_domain: |
33a2b854 | 2945 | |
5c827ce0 DG |
2946 | /* Validate consumer daemon state when start/stop trace command */ |
2947 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2948 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2949 | switch (cmd_ctx->lsm->domain.type) { | |
b9dfb167 | 2950 | case LTTNG_DOMAIN_JUL: |
5c827ce0 DG |
2951 | case LTTNG_DOMAIN_UST: |
2952 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2953 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2954 | goto error; |
2955 | } | |
2956 | break; | |
2957 | case LTTNG_DOMAIN_KERNEL: | |
2958 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2959 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2960 | goto error; |
2961 | } | |
2962 | break; | |
2963 | } | |
2964 | } | |
2965 | ||
8e0af1b4 MD |
2966 | /* |
2967 | * Check that the UID or GID match that of the tracing session. | |
2968 | * The root user can interact with all sessions. | |
2969 | */ | |
2970 | if (need_tracing_session) { | |
2971 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2972 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2973 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2974 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2975 | goto error; |
2976 | } | |
2977 | } | |
2978 | ||
ffe60014 DG |
2979 | /* |
2980 | * Send relayd information to consumer as soon as we have a domain and a | |
2981 | * session defined. | |
2982 | */ | |
2983 | if (cmd_ctx->session && need_domain) { | |
2984 | /* | |
2985 | * Setup relayd if not done yet. If the relayd information was already | |
2986 | * sent to the consumer, this call will gracefully return. | |
2987 | */ | |
2988 | ret = cmd_setup_relayd(cmd_ctx->session); | |
2989 | if (ret != LTTNG_OK) { | |
2990 | goto error; | |
2991 | } | |
2992 | } | |
2993 | ||
54d01ffb DG |
2994 | /* Process by command type */ |
2995 | switch (cmd_ctx->lsm->cmd_type) { | |
2996 | case LTTNG_ADD_CONTEXT: | |
2997 | { | |
2998 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2999 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 3000 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
3001 | break; |
3002 | } | |
3003 | case LTTNG_DISABLE_CHANNEL: | |
3004 | { | |
3005 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3006 | cmd_ctx->lsm->u.disable.channel_name); | |
3007 | break; | |
3008 | } | |
3009 | case LTTNG_DISABLE_EVENT: | |
3010 | { | |
3011 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3012 | cmd_ctx->lsm->u.disable.channel_name, | |
3013 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3014 | break; |
3015 | } | |
54d01ffb DG |
3016 | case LTTNG_DISABLE_ALL_EVENT: |
3017 | { | |
2bdd86d4 | 3018 | DBG("Disabling all events"); |
54d01ffb DG |
3019 | |
3020 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3021 | cmd_ctx->lsm->u.disable.channel_name); | |
3022 | break; | |
3023 | } | |
3024 | case LTTNG_ENABLE_CHANNEL: | |
3025 | { | |
7972aab2 | 3026 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
2f77fc4b | 3027 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
3028 | break; |
3029 | } | |
3030 | case LTTNG_ENABLE_EVENT: | |
3031 | { | |
882ef835 JI |
3032 | struct lttng_event_exclusion *exclusion = NULL; |
3033 | struct lttng_filter_bytecode *bytecode = NULL; | |
3034 | ||
67676bd8 DG |
3035 | /* Handle exclusion events and receive it from the client. */ |
3036 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { | |
3037 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; | |
3038 | ||
3039 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
3040 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
3041 | if (!exclusion) { | |
3042 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
3043 | goto error; | |
882ef835 | 3044 | } |
882ef835 | 3045 | |
67676bd8 DG |
3046 | DBG("Receiving var len exclusion event list from client ..."); |
3047 | exclusion->count = count; | |
3048 | ret = lttcomm_recv_unix_sock(sock, exclusion->names, | |
3049 | count * LTTNG_SYMBOL_NAME_LEN); | |
3050 | if (ret <= 0) { | |
3051 | DBG("Nothing recv() from client var len data... continuing"); | |
3052 | *sock_error = 1; | |
3053 | free(exclusion); | |
3054 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
3055 | goto error; | |
3056 | } | |
3057 | } | |
3058 | ||
3059 | /* Handle filter and get bytecode from client. */ | |
3060 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { | |
3061 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; | |
3062 | ||
3063 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
3064 | ret = LTTNG_ERR_FILTER_INVAL; | |
3065 | free(exclusion); | |
3066 | goto error; | |
3067 | } | |
3068 | ||
3069 | bytecode = zmalloc(bytecode_len); | |
3070 | if (!bytecode) { | |
3071 | free(exclusion); | |
3072 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3073 | goto error; | |
882ef835 JI |
3074 | } |
3075 | ||
67676bd8 DG |
3076 | /* Receive var. len. data */ |
3077 | DBG("Receiving var len filter's bytecode from client ..."); | |
3078 | ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len); | |
3079 | if (ret <= 0) { | |
3080 | DBG("Nothing recv() from client car len data... continuing"); | |
3081 | *sock_error = 1; | |
3082 | free(bytecode); | |
3083 | free(exclusion); | |
3084 | ret = LTTNG_ERR_FILTER_INVAL; | |
3085 | goto error; | |
3086 | } | |
3087 | ||
3088 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
3089 | free(bytecode); | |
3090 | free(exclusion); | |
3091 | ret = LTTNG_ERR_FILTER_INVAL; | |
3092 | goto error; | |
3093 | } | |
882ef835 | 3094 | } |
67676bd8 DG |
3095 | |
3096 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, | |
3097 | cmd_ctx->lsm->u.enable.channel_name, | |
3098 | &cmd_ctx->lsm->u.enable.event, bytecode, exclusion, | |
3099 | kernel_poll_pipe[1]); | |
54d01ffb DG |
3100 | break; |
3101 | } | |
3102 | case LTTNG_ENABLE_ALL_EVENT: | |
3103 | { | |
2bdd86d4 | 3104 | DBG("Enabling all events"); |
54d01ffb | 3105 | |
7972aab2 | 3106 | ret = cmd_enable_event_all(cmd_ctx->session, &cmd_ctx->lsm->domain, |
8c9ae521 | 3107 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 3108 | cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
3109 | break; |
3110 | } | |
052da939 | 3111 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3112 | { |
9f19cc17 | 3113 | struct lttng_event *events; |
54d01ffb | 3114 | ssize_t nb_events; |
052da939 | 3115 | |
54d01ffb DG |
3116 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3117 | if (nb_events < 0) { | |
f73fabfd | 3118 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3119 | ret = -nb_events; |
3120 | goto error; | |
2ef84c95 DG |
3121 | } |
3122 | ||
3123 | /* | |
3124 | * Setup lttng message with payload size set to the event list size in | |
3125 | * bytes and then copy list into the llm payload. | |
3126 | */ | |
052da939 | 3127 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3128 | if (ret < 0) { |
052da939 | 3129 | free(events); |
2ef84c95 DG |
3130 | goto setup_error; |
3131 | } | |
3132 | ||
3133 | /* Copy event list into message payload */ | |
9f19cc17 | 3134 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3135 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3136 | |
9f19cc17 | 3137 | free(events); |
2ef84c95 | 3138 | |
f73fabfd | 3139 | ret = LTTNG_OK; |
2ef84c95 DG |
3140 | break; |
3141 | } | |
f37d259d MD |
3142 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
3143 | { | |
3144 | struct lttng_event_field *fields; | |
3145 | ssize_t nb_fields; | |
3146 | ||
a4b92340 DG |
3147 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
3148 | &fields); | |
f37d259d | 3149 | if (nb_fields < 0) { |
f73fabfd | 3150 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
3151 | ret = -nb_fields; |
3152 | goto error; | |
3153 | } | |
3154 | ||
3155 | /* | |
3156 | * Setup lttng message with payload size set to the event list size in | |
3157 | * bytes and then copy list into the llm payload. | |
3158 | */ | |
a4b92340 DG |
3159 | ret = setup_lttng_msg(cmd_ctx, |
3160 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
3161 | if (ret < 0) { |
3162 | free(fields); | |
3163 | goto setup_error; | |
3164 | } | |
3165 | ||
3166 | /* Copy event list into message payload */ | |
3167 | memcpy(cmd_ctx->llm->payload, fields, | |
3168 | sizeof(struct lttng_event_field) * nb_fields); | |
3169 | ||
3170 | free(fields); | |
3171 | ||
f73fabfd | 3172 | ret = LTTNG_OK; |
f37d259d MD |
3173 | break; |
3174 | } | |
00e2e675 DG |
3175 | case LTTNG_SET_CONSUMER_URI: |
3176 | { | |
a4b92340 DG |
3177 | size_t nb_uri, len; |
3178 | struct lttng_uri *uris; | |
3179 | ||
3180 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3181 | len = nb_uri * sizeof(struct lttng_uri); | |
3182 | ||
3183 | if (nb_uri == 0) { | |
f73fabfd | 3184 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
3185 | goto error; |
3186 | } | |
3187 | ||
3188 | uris = zmalloc(len); | |
3189 | if (uris == NULL) { | |
f73fabfd | 3190 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3191 | goto error; |
3192 | } | |
3193 | ||
3194 | /* Receive variable len data */ | |
77c7c900 | 3195 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
3196 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3197 | if (ret <= 0) { | |
3198 | DBG("No URIs received from client... continuing"); | |
3199 | *sock_error = 1; | |
f73fabfd | 3200 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3201 | free(uris); |
a4b92340 DG |
3202 | goto error; |
3203 | } | |
3204 | ||
00e2e675 | 3205 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 3206 | nb_uri, uris); |
f73fabfd | 3207 | if (ret != LTTNG_OK) { |
b1d41407 | 3208 | free(uris); |
a4b92340 DG |
3209 | goto error; |
3210 | } | |
3211 | ||
3212 | /* | |
3213 | * XXX: 0 means that this URI should be applied on the session. Should | |
3214 | * be a DOMAIN enuam. | |
3215 | */ | |
3216 | if (cmd_ctx->lsm->domain.type == 0) { | |
3217 | /* Add the URI for the UST session if a consumer is present. */ | |
3218 | if (cmd_ctx->session->ust_session && | |
3219 | cmd_ctx->session->ust_session->consumer) { | |
3220 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
3221 | nb_uri, uris); | |
3222 | } else if (cmd_ctx->session->kernel_session && | |
3223 | cmd_ctx->session->kernel_session->consumer) { | |
3224 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
3225 | cmd_ctx->session, nb_uri, uris); | |
3226 | } | |
3227 | } | |
3228 | ||
b1d41407 DG |
3229 | free(uris); |
3230 | ||
00e2e675 DG |
3231 | break; |
3232 | } | |
f3ed775e | 3233 | case LTTNG_START_TRACE: |
8c0faa1d | 3234 | { |
54d01ffb | 3235 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3236 | break; |
3237 | } | |
f3ed775e | 3238 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3239 | { |
54d01ffb | 3240 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3241 | break; |
3242 | } | |
5e16da05 MD |
3243 | case LTTNG_CREATE_SESSION: |
3244 | { | |
a4b92340 DG |
3245 | size_t nb_uri, len; |
3246 | struct lttng_uri *uris = NULL; | |
3247 | ||
3248 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3249 | len = nb_uri * sizeof(struct lttng_uri); | |
3250 | ||
3251 | if (nb_uri > 0) { | |
3252 | uris = zmalloc(len); | |
3253 | if (uris == NULL) { | |
f73fabfd | 3254 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3255 | goto error; |
3256 | } | |
3257 | ||
3258 | /* Receive variable len data */ | |
77c7c900 | 3259 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3260 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3261 | if (ret <= 0) { | |
3262 | DBG("No URIs received from client... continuing"); | |
3263 | *sock_error = 1; | |
f73fabfd | 3264 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3265 | free(uris); |
a4b92340 DG |
3266 | goto error; |
3267 | } | |
3268 | ||
3269 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3270 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3271 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3272 | free(uris); |
a4b92340 DG |
3273 | goto error; |
3274 | } | |
3275 | } | |
3276 | ||
3277 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
ecc48a90 | 3278 | &cmd_ctx->creds, 0); |
a4b92340 | 3279 | |
b1d41407 DG |
3280 | free(uris); |
3281 | ||
00e2e675 DG |
3282 | break; |
3283 | } | |
5e16da05 MD |
3284 | case LTTNG_DESTROY_SESSION: |
3285 | { | |
2f77fc4b | 3286 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
3287 | |
3288 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 3289 | cmd_ctx->session = NULL; |
5461b305 | 3290 | break; |
5e16da05 | 3291 | } |
9f19cc17 | 3292 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3293 | { |
54d01ffb DG |
3294 | ssize_t nb_dom; |
3295 | struct lttng_domain *domains; | |
5461b305 | 3296 | |
54d01ffb DG |
3297 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3298 | if (nb_dom < 0) { | |
f73fabfd | 3299 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3300 | ret = -nb_dom; |
3301 | goto error; | |
ce3d728c | 3302 | } |
520ff687 | 3303 | |
54d01ffb | 3304 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 | 3305 | if (ret < 0) { |
ae9c20bc | 3306 | free(domains); |
5461b305 | 3307 | goto setup_error; |
520ff687 | 3308 | } |
57167058 | 3309 | |
54d01ffb DG |
3310 | /* Copy event list into message payload */ |
3311 | memcpy(cmd_ctx->llm->payload, domains, | |
3312 | nb_dom * sizeof(struct lttng_domain)); | |
3313 | ||
3314 | free(domains); | |
5e16da05 | 3315 | |
f73fabfd | 3316 | ret = LTTNG_OK; |
5e16da05 MD |
3317 | break; |
3318 | } | |
9f19cc17 | 3319 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3320 | { |
6775595e | 3321 | int nb_chan; |
54d01ffb DG |
3322 | struct lttng_channel *channels; |
3323 | ||
b551a063 DG |
3324 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3325 | cmd_ctx->session, &channels); | |
54d01ffb | 3326 | if (nb_chan < 0) { |
f73fabfd | 3327 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3328 | ret = -nb_chan; |
3329 | goto error; | |
5461b305 | 3330 | } |
ca95a216 | 3331 | |
54d01ffb | 3332 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 | 3333 | if (ret < 0) { |
ae9c20bc | 3334 | free(channels); |
5461b305 DG |
3335 | goto setup_error; |
3336 | } | |
9f19cc17 | 3337 | |
54d01ffb DG |
3338 | /* Copy event list into message payload */ |
3339 | memcpy(cmd_ctx->llm->payload, channels, | |
3340 | nb_chan * sizeof(struct lttng_channel)); | |
3341 | ||
3342 | free(channels); | |
9f19cc17 | 3343 | |
f73fabfd | 3344 | ret = LTTNG_OK; |
5461b305 | 3345 | break; |
5e16da05 | 3346 | } |
9f19cc17 | 3347 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3348 | { |
b551a063 | 3349 | ssize_t nb_event; |
684d34d2 | 3350 | struct lttng_event *events = NULL; |
9f19cc17 | 3351 | |
b551a063 | 3352 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3353 | cmd_ctx->lsm->u.list.channel_name, &events); |
3354 | if (nb_event < 0) { | |
f73fabfd | 3355 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3356 | ret = -nb_event; |
3357 | goto error; | |
5461b305 | 3358 | } |
ca95a216 | 3359 | |
54d01ffb | 3360 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 | 3361 | if (ret < 0) { |
ae9c20bc | 3362 | free(events); |
5461b305 DG |
3363 | goto setup_error; |
3364 | } | |
9f19cc17 | 3365 | |
54d01ffb DG |
3366 | /* Copy event list into message payload */ |
3367 | memcpy(cmd_ctx->llm->payload, events, | |
3368 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3369 | |
54d01ffb | 3370 | free(events); |
9f19cc17 | 3371 | |
f73fabfd | 3372 | ret = LTTNG_OK; |
5461b305 | 3373 | break; |
5e16da05 MD |
3374 | } |
3375 | case LTTNG_LIST_SESSIONS: | |
3376 | { | |
8e0af1b4 | 3377 | unsigned int nr_sessions; |
5461b305 | 3378 | |
8e0af1b4 | 3379 | session_lock_list(); |
730389d9 DG |
3380 | nr_sessions = lttng_sessions_count( |
3381 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3382 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3383 | |
8e0af1b4 | 3384 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3385 | if (ret < 0) { |
54d01ffb | 3386 | session_unlock_list(); |
5461b305 | 3387 | goto setup_error; |
e065084a | 3388 | } |
5e16da05 | 3389 | |
6c9cc2ab | 3390 | /* Filled the session array */ |
2f77fc4b | 3391 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3392 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3393 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3394 | |
54d01ffb | 3395 | session_unlock_list(); |
5e16da05 | 3396 | |
f73fabfd | 3397 | ret = LTTNG_OK; |
5e16da05 MD |
3398 | break; |
3399 | } | |
d0254c7c MD |
3400 | case LTTNG_CALIBRATE: |
3401 | { | |
54d01ffb DG |
3402 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3403 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3404 | break; |
3405 | } | |
d9800920 DG |
3406 | case LTTNG_REGISTER_CONSUMER: |
3407 | { | |
2f77fc4b DG |
3408 | struct consumer_data *cdata; |
3409 | ||
3410 | switch (cmd_ctx->lsm->domain.type) { | |
3411 | case LTTNG_DOMAIN_KERNEL: | |
3412 | cdata = &kconsumer_data; | |
3413 | break; | |
3414 | default: | |
f73fabfd | 3415 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3416 | goto error; |
3417 | } | |
3418 | ||
54d01ffb | 3419 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 3420 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
3421 | break; |
3422 | } | |
6d805429 | 3423 | case LTTNG_DATA_PENDING: |
806e2684 | 3424 | { |
6d805429 | 3425 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
3426 | break; |
3427 | } | |
da3c9ec1 DG |
3428 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3429 | { | |
6dc3064a DG |
3430 | struct lttcomm_lttng_output_id reply; |
3431 | ||
3432 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3433 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
3434 | if (ret != LTTNG_OK) { | |
3435 | goto error; | |
3436 | } | |
3437 | ||
3438 | ret = setup_lttng_msg(cmd_ctx, sizeof(reply)); | |
3439 | if (ret < 0) { | |
3440 | goto setup_error; | |
3441 | } | |
3442 | ||
3443 | /* Copy output list into message payload */ | |
3444 | memcpy(cmd_ctx->llm->payload, &reply, sizeof(reply)); | |
3445 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3446 | break; |
3447 | } | |
3448 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3449 | { | |
6dc3064a DG |
3450 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
3451 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
3452 | break; |
3453 | } | |
3454 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3455 | { | |
6dc3064a DG |
3456 | ssize_t nb_output; |
3457 | struct lttng_snapshot_output *outputs = NULL; | |
3458 | ||
3459 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
3460 | if (nb_output < 0) { | |
3461 | ret = -nb_output; | |
3462 | goto error; | |
3463 | } | |
3464 | ||
3465 | ret = setup_lttng_msg(cmd_ctx, | |
3466 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3467 | if (ret < 0) { | |
3468 | free(outputs); | |
3469 | goto setup_error; | |
3470 | } | |
3471 | ||
3472 | if (outputs) { | |
3473 | /* Copy output list into message payload */ | |
3474 | memcpy(cmd_ctx->llm->payload, outputs, | |
3475 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3476 | free(outputs); | |
3477 | } | |
3478 | ||
3479 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3480 | break; |
3481 | } | |
3482 | case LTTNG_SNAPSHOT_RECORD: | |
3483 | { | |
6dc3064a DG |
3484 | ret = cmd_snapshot_record(cmd_ctx->session, |
3485 | &cmd_ctx->lsm->u.snapshot_record.output, | |
3486 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
3487 | break; |
3488 | } | |
27babd3a DG |
3489 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
3490 | { | |
3491 | size_t nb_uri, len; | |
3492 | struct lttng_uri *uris = NULL; | |
3493 | ||
3494 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3495 | len = nb_uri * sizeof(struct lttng_uri); | |
3496 | ||
3497 | if (nb_uri > 0) { | |
3498 | uris = zmalloc(len); | |
3499 | if (uris == NULL) { | |
3500 | ret = LTTNG_ERR_FATAL; | |
3501 | goto error; | |
3502 | } | |
3503 | ||
3504 | /* Receive variable len data */ | |
3505 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3506 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3507 | if (ret <= 0) { | |
3508 | DBG("No URIs received from client... continuing"); | |
3509 | *sock_error = 1; | |
3510 | ret = LTTNG_ERR_SESSION_FAIL; | |
3511 | free(uris); | |
3512 | goto error; | |
3513 | } | |
3514 | ||
3515 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3516 | DBG("Creating session with ONE network URI is a bad call"); | |
3517 | ret = LTTNG_ERR_SESSION_FAIL; | |
3518 | free(uris); | |
3519 | goto error; | |
3520 | } | |
3521 | } | |
3522 | ||
3523 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
3524 | nb_uri, &cmd_ctx->creds); | |
3525 | free(uris); | |
3526 | break; | |
3527 | } | |
ecc48a90 JD |
3528 | case LTTNG_CREATE_SESSION_LIVE: |
3529 | { | |
3530 | size_t nb_uri, len; | |
3531 | struct lttng_uri *uris = NULL; | |
3532 | ||
3533 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3534 | len = nb_uri * sizeof(struct lttng_uri); | |
3535 | ||
3536 | if (nb_uri > 0) { | |
3537 | uris = zmalloc(len); | |
3538 | if (uris == NULL) { | |
3539 | ret = LTTNG_ERR_FATAL; | |
3540 | goto error; | |
3541 | } | |
3542 | ||
3543 | /* Receive variable len data */ | |
3544 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3545 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3546 | if (ret <= 0) { | |
3547 | DBG("No URIs received from client... continuing"); | |
3548 | *sock_error = 1; | |
3549 | ret = LTTNG_ERR_SESSION_FAIL; | |
3550 | free(uris); | |
3551 | goto error; | |
3552 | } | |
3553 | ||
3554 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3555 | DBG("Creating session with ONE network URI is a bad call"); | |
3556 | ret = LTTNG_ERR_SESSION_FAIL; | |
3557 | free(uris); | |
3558 | goto error; | |
3559 | } | |
3560 | } | |
3561 | ||
3562 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, | |
3563 | nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval); | |
3564 | free(uris); | |
3565 | break; | |
3566 | } | |
5e16da05 | 3567 | default: |
f73fabfd | 3568 | ret = LTTNG_ERR_UND; |
5461b305 | 3569 | break; |
fac6795d DG |
3570 | } |
3571 | ||
5461b305 | 3572 | error: |
5461b305 DG |
3573 | if (cmd_ctx->llm == NULL) { |
3574 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3575 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3576 | goto setup_error; |
3577 | } | |
3578 | } | |
54d01ffb | 3579 | /* Set return code */ |
5461b305 | 3580 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3581 | setup_error: |
b5541356 | 3582 | if (cmd_ctx->session) { |
54d01ffb | 3583 | session_unlock(cmd_ctx->session); |
b5541356 | 3584 | } |
256a5576 MD |
3585 | if (need_tracing_session) { |
3586 | session_unlock_list(); | |
3587 | } | |
54d01ffb | 3588 | init_setup_error: |
8028d920 | 3589 | return ret; |
fac6795d DG |
3590 | } |
3591 | ||
44a5e5eb DG |
3592 | /* |
3593 | * Thread managing health check socket. | |
3594 | */ | |
3595 | static void *thread_manage_health(void *data) | |
3596 | { | |
eb4a2943 | 3597 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
3598 | uint32_t revents, nb_fd; |
3599 | struct lttng_poll_event events; | |
0c89d795 MD |
3600 | struct health_comm_msg msg; |
3601 | struct health_comm_reply reply; | |
44a5e5eb DG |
3602 | |
3603 | DBG("[thread] Manage health check started"); | |
3604 | ||
3605 | rcu_register_thread(); | |
3606 | ||
6d737ce4 DG |
3607 | /* We might hit an error path before this is created. */ |
3608 | lttng_poll_init(&events); | |
3cc04881 | 3609 | |
44a5e5eb DG |
3610 | /* Create unix socket */ |
3611 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
3612 | if (sock < 0) { | |
3613 | ERR("Unable to create health check Unix socket"); | |
3614 | ret = -1; | |
3615 | goto error; | |
3616 | } | |
3617 | ||
6c71277b MD |
3618 | if (is_root) { |
3619 | /* lttng health client socket path permissions */ | |
3620 | ret = chown(health_unix_sock_path, 0, | |
3621 | utils_get_group_id(tracing_group_name)); | |
3622 | if (ret < 0) { | |
3623 | ERR("Unable to set group on %s", health_unix_sock_path); | |
3624 | PERROR("chown"); | |
3625 | ret = -1; | |
3626 | goto error; | |
3627 | } | |
3628 | ||
3629 | ret = chmod(health_unix_sock_path, | |
3630 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3631 | if (ret < 0) { | |
3632 | ERR("Unable to set permissions on %s", health_unix_sock_path); | |
3633 | PERROR("chmod"); | |
3634 | ret = -1; | |
3635 | goto error; | |
3636 | } | |
3637 | } | |
3638 | ||
b662582b DG |
3639 | /* |
3640 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3641 | * show must go on. | |
3642 | */ | |
3643 | (void) utils_set_fd_cloexec(sock); | |
3644 | ||
44a5e5eb DG |
3645 | ret = lttcomm_listen_unix_sock(sock); |
3646 | if (ret < 0) { | |
3647 | goto error; | |
3648 | } | |
3649 | ||
3650 | /* | |
3651 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3652 | * more will be added to this poll set. | |
3653 | */ | |
d0b96690 | 3654 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
3655 | if (ret < 0) { |
3656 | goto error; | |
3657 | } | |
3658 | ||
3659 | /* Add the application registration socket */ | |
3660 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
3661 | if (ret < 0) { | |
3662 | goto error; | |
3663 | } | |
3664 | ||
97bc1426 MD |
3665 | lttng_sessiond_notify_ready(); |
3666 | ||
44a5e5eb DG |
3667 | while (1) { |
3668 | DBG("Health check ready"); | |
3669 | ||
44a5e5eb DG |
3670 | /* Inifinite blocking call, waiting for transmission */ |
3671 | restart: | |
3672 | ret = lttng_poll_wait(&events, -1); | |
3673 | if (ret < 0) { | |
3674 | /* | |
3675 | * Restart interrupted system call. | |
3676 | */ | |
3677 | if (errno == EINTR) { | |
3678 | goto restart; | |
3679 | } | |
3680 | goto error; | |
3681 | } | |
3682 | ||
0d9c5d77 DG |
3683 | nb_fd = ret; |
3684 | ||
44a5e5eb DG |
3685 | for (i = 0; i < nb_fd; i++) { |
3686 | /* Fetch once the poll data */ | |
3687 | revents = LTTNG_POLL_GETEV(&events, i); | |
3688 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3689 | ||
3690 | /* Thread quit pipe has been closed. Killing thread. */ | |
d0b96690 | 3691 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 3692 | if (ret) { |
139ac872 MD |
3693 | err = 0; |
3694 | goto exit; | |
44a5e5eb DG |
3695 | } |
3696 | ||
3697 | /* Event on the registration socket */ | |
3698 | if (pollfd == sock) { | |
3699 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3700 | ERR("Health socket poll error"); | |
3701 | goto error; | |
3702 | } | |
3703 | } | |
3704 | } | |
3705 | ||
3706 | new_sock = lttcomm_accept_unix_sock(sock); | |
3707 | if (new_sock < 0) { | |
3708 | goto error; | |
3709 | } | |
3710 | ||
b662582b DG |
3711 | /* |
3712 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3713 | * show must go on. | |
3714 | */ | |
3715 | (void) utils_set_fd_cloexec(new_sock); | |
3716 | ||
44a5e5eb DG |
3717 | DBG("Receiving data from client for health..."); |
3718 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
3719 | if (ret <= 0) { | |
3720 | DBG("Nothing recv() from client... continuing"); | |
3721 | ret = close(new_sock); | |
3722 | if (ret) { | |
3723 | PERROR("close"); | |
3724 | } | |
3725 | new_sock = -1; | |
3726 | continue; | |
3727 | } | |
3728 | ||
3729 | rcu_thread_online(); | |
3730 | ||
6c71277b MD |
3731 | reply.ret_code = 0; |
3732 | for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) { | |
3733 | /* | |
3734 | * health_check_state returns 0 if health is | |
3735 | * bad. | |
3736 | */ | |
3737 | if (!health_check_state(health_sessiond, i)) { | |
3738 | reply.ret_code |= 1ULL << i; | |
3739 | } | |
44a5e5eb DG |
3740 | } |
3741 | ||
6c71277b | 3742 | DBG2("Health check return value %" PRIx64, reply.ret_code); |
44a5e5eb DG |
3743 | |
3744 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
3745 | if (ret < 0) { | |
3746 | ERR("Failed to send health data back to client"); | |
3747 | } | |
3748 | ||
3749 | /* End of transmission */ | |
3750 | ret = close(new_sock); | |
3751 | if (ret) { | |
3752 | PERROR("close"); | |
3753 | } | |
3754 | new_sock = -1; | |
3755 | } | |
3756 | ||
139ac872 | 3757 | exit: |
44a5e5eb | 3758 | error: |
139ac872 MD |
3759 | if (err) { |
3760 | ERR("Health error occurred in %s", __func__); | |
3761 | } | |
44a5e5eb DG |
3762 | DBG("Health check thread dying"); |
3763 | unlink(health_unix_sock_path); | |
3764 | if (sock >= 0) { | |
3765 | ret = close(sock); | |
3766 | if (ret) { | |
3767 | PERROR("close"); | |
3768 | } | |
3769 | } | |
44a5e5eb DG |
3770 | |
3771 | lttng_poll_clean(&events); | |
3772 | ||
3773 | rcu_unregister_thread(); | |
3774 | return NULL; | |
3775 | } | |
3776 | ||
1d4b027a | 3777 | /* |
d063d709 DG |
3778 | * This thread manage all clients request using the unix client socket for |
3779 | * communication. | |
1d4b027a DG |
3780 | */ |
3781 | static void *thread_manage_clients(void *data) | |
3782 | { | |
139ac872 | 3783 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3784 | int sock_error; |
5eb91c98 | 3785 | uint32_t revents, nb_fd; |
273ea72c | 3786 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3787 | struct lttng_poll_event events; |
1d4b027a DG |
3788 | |
3789 | DBG("[thread] Manage client started"); | |
3790 | ||
f6a9efaa DG |
3791 | rcu_register_thread(); |
3792 | ||
6c71277b | 3793 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
927ca06a | 3794 | |
840cb59c | 3795 | health_code_update(); |
44a5e5eb | 3796 | |
1d4b027a DG |
3797 | ret = lttcomm_listen_unix_sock(client_sock); |
3798 | if (ret < 0) { | |
35df2755 | 3799 | goto error_listen; |
1d4b027a DG |
3800 | } |
3801 | ||
5eb91c98 DG |
3802 | /* |
3803 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3804 | * more will be added to this poll set. | |
3805 | */ | |
d0b96690 | 3806 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 3807 | if (ret < 0) { |
35df2755 | 3808 | goto error_create_poll; |
5eb91c98 | 3809 | } |
273ea72c | 3810 | |
5eb91c98 DG |
3811 | /* Add the application registration socket */ |
3812 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3813 | if (ret < 0) { | |
3814 | goto error; | |
3815 | } | |
273ea72c | 3816 | |
97bc1426 | 3817 | lttng_sessiond_notify_ready(); |
0bb7724a | 3818 | |
72453c8c MD |
3819 | /* This testpoint is after we signal readiness to the parent. */ |
3820 | if (testpoint(sessiond_thread_manage_clients)) { | |
3821 | goto error; | |
3822 | } | |
3823 | ||
e547b070 | 3824 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { |
6993eeb3 CB |
3825 | goto error; |
3826 | } | |
8ac94142 | 3827 | |
840cb59c | 3828 | health_code_update(); |
44a5e5eb | 3829 | |
1d4b027a | 3830 | while (1) { |
1d4b027a | 3831 | DBG("Accepting client command ..."); |
273ea72c DG |
3832 | |
3833 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 3834 | restart: |
a78af745 | 3835 | health_poll_entry(); |
5eb91c98 | 3836 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 3837 | health_poll_exit(); |
273ea72c | 3838 | if (ret < 0) { |
88f2b785 MD |
3839 | /* |
3840 | * Restart interrupted system call. | |
3841 | */ | |
3842 | if (errno == EINTR) { | |
3843 | goto restart; | |
3844 | } | |
273ea72c DG |
3845 | goto error; |
3846 | } | |
3847 | ||
0d9c5d77 DG |
3848 | nb_fd = ret; |
3849 | ||
5eb91c98 DG |
3850 | for (i = 0; i < nb_fd; i++) { |
3851 | /* Fetch once the poll data */ | |
3852 | revents = LTTNG_POLL_GETEV(&events, i); | |
3853 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3854 | ||
840cb59c | 3855 | health_code_update(); |
44a5e5eb | 3856 | |
5eb91c98 | 3857 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 3858 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 3859 | if (ret) { |
139ac872 MD |
3860 | err = 0; |
3861 | goto exit; | |
5eb91c98 DG |
3862 | } |
3863 | ||
3864 | /* Event on the registration socket */ | |
3865 | if (pollfd == client_sock) { | |
3866 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3867 | ERR("Client socket poll error"); | |
3868 | goto error; | |
3869 | } | |
3870 | } | |
3871 | } | |
3872 | ||
3873 | DBG("Wait for client response"); | |
3874 | ||
840cb59c | 3875 | health_code_update(); |
44a5e5eb | 3876 | |
5eb91c98 DG |
3877 | sock = lttcomm_accept_unix_sock(client_sock); |
3878 | if (sock < 0) { | |
273ea72c | 3879 | goto error; |
273ea72c DG |
3880 | } |
3881 | ||
b662582b DG |
3882 | /* |
3883 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3884 | * show must go on. | |
3885 | */ | |
3886 | (void) utils_set_fd_cloexec(sock); | |
3887 | ||
be040666 DG |
3888 | /* Set socket option for credentials retrieval */ |
3889 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3890 | if (ret < 0) { | |
3891 | goto error; | |
3892 | } | |
3893 | ||
5eb91c98 | 3894 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3895 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3896 | if (cmd_ctx == NULL) { |
76d7553f | 3897 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3898 | goto error; |
5eb91c98 | 3899 | } |
1d4b027a | 3900 | |
5eb91c98 | 3901 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3902 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3903 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3904 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3905 | goto error; |
3906 | } | |
1d4b027a | 3907 | |
5eb91c98 DG |
3908 | cmd_ctx->llm = NULL; |
3909 | cmd_ctx->session = NULL; | |
1d4b027a | 3910 | |
840cb59c | 3911 | health_code_update(); |
44a5e5eb | 3912 | |
5eb91c98 DG |
3913 | /* |
3914 | * Data is received from the lttng client. The struct | |
3915 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3916 | * the client. | |
3917 | */ | |
3918 | DBG("Receiving data from client ..."); | |
be040666 DG |
3919 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3920 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3921 | if (ret <= 0) { |
3922 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3923 | ret = close(sock); |
3924 | if (ret) { | |
3925 | PERROR("close"); | |
3926 | } | |
3927 | sock = -1; | |
a2c0da86 | 3928 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3929 | continue; |
3930 | } | |
1d4b027a | 3931 | |
840cb59c | 3932 | health_code_update(); |
44a5e5eb | 3933 | |
5eb91c98 DG |
3934 | // TODO: Validate cmd_ctx including sanity check for |
3935 | // security purpose. | |
f7776ea7 | 3936 | |
f6a9efaa | 3937 | rcu_thread_online(); |
5eb91c98 DG |
3938 | /* |
3939 | * This function dispatch the work to the kernel or userspace tracer | |
3940 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3941 | * informations for the client. The command context struct contains | |
3942 | * everything this function may needs. | |
3943 | */ | |
53a80697 | 3944 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3945 | rcu_thread_offline(); |
5eb91c98 | 3946 | if (ret < 0) { |
36134aa1 DG |
3947 | ret = close(sock); |
3948 | if (ret) { | |
3949 | PERROR("close"); | |
53a80697 | 3950 | } |
36134aa1 | 3951 | sock = -1; |
bbd973c2 | 3952 | /* |
5eb91c98 | 3953 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3954 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3955 | * (ENOMEM). Error detected but still accept |
3956 | * command, unless a socket error has been | |
3957 | * detected. | |
bbd973c2 | 3958 | */ |
bbd973c2 | 3959 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3960 | continue; |
3961 | } | |
d6e4fca4 | 3962 | |
840cb59c | 3963 | health_code_update(); |
44a5e5eb | 3964 | |
54d01ffb DG |
3965 | DBG("Sending response (size: %d, retcode: %s)", |
3966 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3967 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3968 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3969 | if (ret < 0) { |
3970 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3971 | } |
1d4b027a | 3972 | |
5eb91c98 | 3973 | /* End of transmission */ |
76d7553f MD |
3974 | ret = close(sock); |
3975 | if (ret) { | |
3976 | PERROR("close"); | |
3977 | } | |
3978 | sock = -1; | |
be040666 DG |
3979 | |
3980 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 3981 | |
840cb59c | 3982 | health_code_update(); |
273ea72c DG |
3983 | } |
3984 | ||
139ac872 | 3985 | exit: |
5eb91c98 | 3986 | error: |
35df2755 CB |
3987 | if (sock >= 0) { |
3988 | ret = close(sock); | |
3989 | if (ret) { | |
3990 | PERROR("close"); | |
3991 | } | |
139ac872 | 3992 | } |
44a5e5eb | 3993 | |
35df2755 CB |
3994 | lttng_poll_clean(&events); |
3995 | clean_command_ctx(&cmd_ctx); | |
3996 | ||
3997 | error_listen: | |
3998 | error_create_poll: | |
273ea72c | 3999 | unlink(client_unix_sock_path); |
76d7553f MD |
4000 | if (client_sock >= 0) { |
4001 | ret = close(client_sock); | |
4002 | if (ret) { | |
4003 | PERROR("close"); | |
4004 | } | |
a4b35e07 | 4005 | } |
35df2755 CB |
4006 | |
4007 | if (err) { | |
840cb59c | 4008 | health_error(); |
35df2755 | 4009 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 4010 | } |
273ea72c | 4011 | |
8782cc74 | 4012 | health_unregister(health_sessiond); |
35df2755 CB |
4013 | |
4014 | DBG("Client thread dying"); | |
f6a9efaa DG |
4015 | |
4016 | rcu_unregister_thread(); | |
1d4b027a DG |
4017 | return NULL; |
4018 | } | |
4019 | ||
4020 | ||
fac6795d DG |
4021 | /* |
4022 | * usage function on stderr | |
4023 | */ | |
4024 | static void usage(void) | |
4025 | { | |
b716ce68 | 4026 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
4027 | fprintf(stderr, " -h, --help Display this usage.\n"); |
4028 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
4029 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
4030 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
4031 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
4032 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
4033 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
4034 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
4035 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
4036 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
4037 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
4038 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
4039 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
4040 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
4041 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
4042 | fprintf(stderr, " -V, --version Show version number.\n"); | |
7fe6d2c5 | 4043 | fprintf(stderr, " -S, --sig-parent Send SIGUSR1 to parent pid to notify readiness.\n"); |
d6f42150 DG |
4044 | fprintf(stderr, " -q, --quiet No output at all.\n"); |
4045 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
35f90c40 | 4046 | fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n"); |
3bd1e081 | 4047 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 4048 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
4d076222 | 4049 | fprintf(stderr, " --jul-tcp-port JUL application registration TCP port\n"); |
26296c48 | 4050 | fprintf(stderr, " -f --config Load daemon configuration file\n"); |
fac6795d DG |
4051 | } |
4052 | ||
4053 | /* | |
26296c48 JG |
4054 | * Take an option from the getopt output and set it in the right variable to be |
4055 | * used later. | |
4056 | * | |
4057 | * Return 0 on success else a negative value. | |
fac6795d | 4058 | */ |
26296c48 | 4059 | static int set_option(int opt, const char *arg, const char *optname) |
fac6795d | 4060 | { |
26296c48 | 4061 | int ret = 0; |
fac6795d | 4062 | |
26296c48 JG |
4063 | switch (opt) { |
4064 | case 0: | |
4065 | fprintf(stderr, "option %s", optname); | |
4066 | if (arg) { | |
4067 | fprintf(stderr, " with arg %s\n", arg); | |
fac6795d | 4068 | } |
26296c48 JG |
4069 | break; |
4070 | case 'c': | |
4071 | snprintf(client_unix_sock_path, PATH_MAX, "%s", arg); | |
4072 | break; | |
4073 | case 'a': | |
4074 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", arg); | |
4075 | break; | |
4076 | case 'd': | |
4077 | opt_daemon = 1; | |
4078 | break; | |
4079 | case 'g': | |
4080 | tracing_group_name = strdup(arg); | |
4081 | break; | |
4082 | case 'h': | |
4083 | usage(); | |
4084 | exit(EXIT_FAILURE); | |
4085 | case 'V': | |
4086 | fprintf(stdout, "%s\n", VERSION); | |
4087 | exit(EXIT_SUCCESS); | |
4088 | case 'S': | |
4089 | opt_sig_parent = 1; | |
4090 | break; | |
4091 | case 'E': | |
4092 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4093 | break; | |
4094 | case 'C': | |
4095 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4096 | break; | |
4097 | case 'F': | |
4098 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4099 | break; | |
4100 | case 'D': | |
4101 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4102 | break; | |
4103 | case 'H': | |
4104 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4105 | break; | |
4106 | case 'G': | |
4107 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4108 | break; | |
4109 | case 'N': | |
4110 | opt_no_kernel = 1; | |
4111 | break; | |
4112 | case 'q': | |
4113 | lttng_opt_quiet = 1; | |
4114 | break; | |
4115 | case 'v': | |
4116 | /* Verbose level can increase using multiple -v */ | |
4117 | if (arg) { | |
4118 | lttng_opt_verbose = config_parse_value(arg); | |
4119 | } else { | |
97e19046 | 4120 | lttng_opt_verbose += 1; |
26296c48 JG |
4121 | } |
4122 | break; | |
4123 | case 'Z': | |
4124 | if (arg) { | |
4125 | opt_verbose_consumer = config_parse_value(arg); | |
4126 | } else { | |
3bd1e081 | 4127 | opt_verbose_consumer += 1; |
26296c48 JG |
4128 | } |
4129 | break; | |
4130 | case 'u': | |
4131 | consumerd32_bin = strdup(arg); | |
4132 | consumerd32_bin_override = 1; | |
4133 | break; | |
4134 | case 'U': | |
4135 | consumerd32_libdir = strdup(arg); | |
4136 | consumerd32_libdir_override = 1; | |
4137 | break; | |
4138 | case 't': | |
4139 | consumerd64_bin = strdup(arg); | |
4140 | consumerd64_bin_override = 1; | |
4141 | break; | |
4142 | case 'T': | |
4143 | consumerd64_libdir = strdup(arg); | |
4144 | consumerd64_libdir_override = 1; | |
4145 | break; | |
4146 | case 'p': | |
4147 | opt_pidfile = strdup(arg); | |
4148 | break; | |
4149 | case 'J': /* JUL TCP port. */ | |
4150 | { | |
4151 | unsigned long v; | |
4d076222 | 4152 | |
26296c48 JG |
4153 | errno = 0; |
4154 | v = strtoul(arg, NULL, 0); | |
4155 | if (errno != 0 || !isdigit(arg[0])) { | |
4156 | ERR("Wrong value in --jul-tcp-port parameter: %s", arg); | |
4157 | return -1; | |
4158 | } | |
4159 | if (v == 0 || v >= 65535) { | |
4160 | ERR("Port overflow in --jul-tcp-port parameter: %s", arg); | |
4161 | return -1; | |
4162 | } | |
4163 | jul_tcp_port = (uint32_t) v; | |
4164 | DBG3("JUL TCP port set to non default: %u", jul_tcp_port); | |
4165 | break; | |
4166 | } | |
4167 | default: | |
4168 | /* Unknown option or other error. | |
4169 | * Error is printed by getopt, just return */ | |
4170 | ret = -1; | |
4171 | } | |
4172 | ||
4173 | return ret; | |
4174 | } | |
4175 | ||
4176 | /* | |
4177 | * config_entry_handler_cb used to handle options read from a config file. | |
4178 | * See config_entry_handler_cb comment in common/config/config.h for the | |
4179 | * return value conventions. | |
4180 | */ | |
4181 | static int config_entry_handler(const struct config_entry *entry, void *unused) | |
4182 | { | |
4183 | int ret = 0, i; | |
4184 | ||
4185 | if (!entry || !entry->name || !entry->value) { | |
4186 | ret = -EINVAL; | |
4187 | goto end; | |
4188 | } | |
4189 | ||
4190 | /* Check if the option is to be ignored */ | |
4191 | for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) { | |
4192 | if (!strcmp(entry->name, config_ignore_options[i])) { | |
4193 | goto end; | |
4194 | } | |
4195 | } | |
4196 | ||
4197 | for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; | |
4198 | i++) { | |
4199 | ||
4200 | /* Ignore if not fully matched. */ | |
4201 | if (strcmp(entry->name, long_options[i].name)) { | |
4202 | continue; | |
4203 | } | |
4204 | ||
4205 | /* | |
4206 | * If the option takes no argument on the command line, we have to | |
4207 | * check if the value is "true". We support non-zero numeric values, | |
4208 | * true, on and yes. | |
4209 | */ | |
4210 | if (!long_options[i].has_arg) { | |
4211 | ret = config_parse_value(entry->value); | |
4212 | if (ret <= 0) { | |
4213 | if (ret) { | |
4214 | WARN("Invalid configuration value \"%s\" for option %s", | |
4215 | entry->value, entry->name); | |
4216 | } | |
4217 | /* False, skip boolean config option. */ | |
4218 | goto end; | |
4d076222 | 4219 | } |
26296c48 JG |
4220 | } |
4221 | ||
4222 | ret = set_option(long_options[i].val, entry->value, entry->name); | |
4223 | goto end; | |
4224 | } | |
4225 | ||
4226 | WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name); | |
4227 | ||
4228 | end: | |
4229 | return ret; | |
4230 | } | |
4231 | ||
4232 | /* | |
4233 | * daemon configuration loading and argument parsing | |
4234 | */ | |
4235 | static int set_options(int argc, char **argv) | |
4236 | { | |
4237 | int ret = 0, c = 0, option_index = 0; | |
4238 | int orig_optopt = optopt, orig_optind = optind; | |
4239 | char *optstring; | |
4240 | const char *config_path = NULL; | |
4241 | ||
4242 | optstring = utils_generate_optstring(long_options, | |
4243 | sizeof(long_options) / sizeof(struct option)); | |
4244 | if (!optstring) { | |
4245 | ret = -ENOMEM; | |
4246 | goto end; | |
4247 | } | |
4248 | ||
4249 | /* Check for the --config option */ | |
4250 | while ((c = getopt_long(argc, argv, optstring, long_options, | |
4251 | &option_index)) != -1) { | |
4252 | if (c == '?') { | |
4253 | ret = -EINVAL; | |
4254 | goto end; | |
4255 | } else if (c != 'f') { | |
4256 | /* if not equal to --config option. */ | |
4257 | continue; | |
4258 | } | |
4259 | ||
4260 | config_path = utils_expand_path(optarg); | |
4261 | if (!config_path) { | |
4262 | ERR("Failed to resolve path: %s", optarg); | |
4263 | } | |
4264 | } | |
4265 | ||
4266 | ret = config_get_section_entries(config_path, config_section_name, | |
4267 | config_entry_handler, NULL); | |
4268 | if (ret) { | |
4269 | if (ret > 0) { | |
4270 | ERR("Invalid configuration option at line %i", ret); | |
4271 | ret = -1; | |
4272 | } | |
4273 | goto end; | |
4274 | } | |
4275 | ||
4276 | /* Reset getopt's global state */ | |
4277 | optopt = orig_optopt; | |
4278 | optind = orig_optind; | |
4279 | while (1) { | |
4280 | c = getopt_long(argc, argv, optstring, long_options, &option_index); | |
4281 | if (c == -1) { | |
4d076222 DG |
4282 | break; |
4283 | } | |
26296c48 JG |
4284 | |
4285 | ret = set_option(c, optarg, long_options[option_index].name); | |
4286 | if (ret < 0) { | |
4287 | break; | |
fac6795d DG |
4288 | } |
4289 | } | |
4290 | ||
26296c48 JG |
4291 | end: |
4292 | free(optstring); | |
4293 | return ret; | |
fac6795d DG |
4294 | } |
4295 | ||
4296 | /* | |
d063d709 | 4297 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4298 | * apps_sock - The communication socket for all UST apps. |
4299 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4300 | */ |
cf3af59e | 4301 | static int init_daemon_socket(void) |
fac6795d DG |
4302 | { |
4303 | int ret = 0; | |
4304 | mode_t old_umask; | |
4305 | ||
4306 | old_umask = umask(0); | |
4307 | ||
4308 | /* Create client tool unix socket */ | |
d6f42150 DG |
4309 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4310 | if (client_sock < 0) { | |
4311 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4312 | ret = -1; |
4313 | goto end; | |
4314 | } | |
4315 | ||
b662582b DG |
4316 | /* Set the cloexec flag */ |
4317 | ret = utils_set_fd_cloexec(client_sock); | |
4318 | if (ret < 0) { | |
4319 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
4320 | "Continuing but note that the consumer daemon will have a " | |
4321 | "reference to this socket on exec()", client_sock); | |
4322 | } | |
4323 | ||
fac6795d DG |
4324 | /* File permission MUST be 660 */ |
4325 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4326 | if (ret < 0) { | |
d6f42150 | 4327 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4328 | PERROR("chmod"); |
fac6795d DG |
4329 | goto end; |
4330 | } | |
4331 | ||
4332 | /* Create the application unix socket */ | |
d6f42150 DG |
4333 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4334 | if (apps_sock < 0) { | |
4335 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4336 | ret = -1; |
4337 | goto end; | |
4338 | } | |
4339 | ||
b662582b DG |
4340 | /* Set the cloexec flag */ |
4341 | ret = utils_set_fd_cloexec(apps_sock); | |
4342 | if (ret < 0) { | |
4343 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
4344 | "Continuing but note that the consumer daemon will have a " | |
4345 | "reference to this socket on exec()", apps_sock); | |
4346 | } | |
4347 | ||
d6f42150 | 4348 | /* File permission MUST be 666 */ |
54d01ffb DG |
4349 | ret = chmod(apps_unix_sock_path, |
4350 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4351 | if (ret < 0) { |
d6f42150 | 4352 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4353 | PERROR("chmod"); |
fac6795d DG |
4354 | goto end; |
4355 | } | |
4356 | ||
b662582b DG |
4357 | DBG3("Session daemon client socket %d and application socket %d created", |
4358 | client_sock, apps_sock); | |
4359 | ||
fac6795d DG |
4360 | end: |
4361 | umask(old_umask); | |
4362 | return ret; | |
4363 | } | |
4364 | ||
4365 | /* | |
54d01ffb DG |
4366 | * Check if the global socket is available, and if a daemon is answering at the |
4367 | * other side. If yes, error is returned. | |
fac6795d | 4368 | */ |
cf3af59e | 4369 | static int check_existing_daemon(void) |
fac6795d | 4370 | { |
7d8234d9 | 4371 | /* Is there anybody out there ? */ |
099e26bd | 4372 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4373 | return -EEXIST; |
099e26bd | 4374 | } |
b09c7c76 DG |
4375 | |
4376 | return 0; | |
fac6795d DG |
4377 | } |
4378 | ||
fac6795d | 4379 | /* |
d063d709 | 4380 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4381 | * |
d063d709 | 4382 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4383 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4384 | */ |
be040666 | 4385 | static int set_permissions(char *rundir) |
fac6795d DG |
4386 | { |
4387 | int ret; | |
996b65c8 | 4388 | gid_t gid; |
fac6795d | 4389 | |
6c71277b | 4390 | gid = utils_get_group_id(tracing_group_name); |
fac6795d | 4391 | |
d6f42150 | 4392 | /* Set lttng run dir */ |
be040666 | 4393 | ret = chown(rundir, 0, gid); |
d6f42150 | 4394 | if (ret < 0) { |
be040666 | 4395 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4396 | PERROR("chown"); |
d6f42150 DG |
4397 | } |
4398 | ||
6c71277b MD |
4399 | /* |
4400 | * Ensure all applications and tracing group can search the run | |
4401 | * dir. Allow everyone to read the directory, since it does not | |
4402 | * buy us anything to hide its content. | |
4403 | */ | |
4404 | ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
d1613cf5 JN |
4405 | if (ret < 0) { |
4406 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 4407 | PERROR("chmod"); |
d1613cf5 JN |
4408 | } |
4409 | ||
d6f42150 | 4410 | /* lttng client socket path */ |
996b65c8 | 4411 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4412 | if (ret < 0) { |
d6f42150 | 4413 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 4414 | PERROR("chown"); |
d6f42150 DG |
4415 | } |
4416 | ||
3bd1e081 | 4417 | /* kconsumer error socket path */ |
6c71277b | 4418 | ret = chown(kconsumer_data.err_unix_sock_path, 0, 0); |
d6f42150 | 4419 | if (ret < 0) { |
3bd1e081 | 4420 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4421 | PERROR("chown"); |
3bd1e081 MD |
4422 | } |
4423 | ||
7753dea8 | 4424 | /* 64-bit ustconsumer error socket path */ |
6c71277b | 4425 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0); |
7753dea8 MD |
4426 | if (ret < 0) { |
4427 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4428 | PERROR("chown"); |
7753dea8 MD |
4429 | } |
4430 | ||
4431 | /* 32-bit ustconsumer compat32 error socket path */ | |
6c71277b | 4432 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0); |
3bd1e081 | 4433 | if (ret < 0) { |
7753dea8 | 4434 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4435 | PERROR("chown"); |
fac6795d DG |
4436 | } |
4437 | ||
d6f42150 | 4438 | DBG("All permissions are set"); |
e07ae692 | 4439 | |
fac6795d DG |
4440 | return ret; |
4441 | } | |
4442 | ||
d6f42150 | 4443 | /* |
d063d709 | 4444 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4445 | */ |
67e40797 | 4446 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4447 | { |
4448 | int ret; | |
4449 | ||
67e40797 DG |
4450 | DBG3("Creating LTTng run directory: %s", rundir); |
4451 | ||
d1613cf5 | 4452 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4453 | if (ret < 0) { |
b1f11e69 | 4454 | if (errno != EEXIST) { |
67e40797 | 4455 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4456 | goto error; |
4457 | } else { | |
4458 | ret = 0; | |
4459 | } | |
d6f42150 DG |
4460 | } |
4461 | ||
4462 | error: | |
4463 | return ret; | |
4464 | } | |
4465 | ||
4466 | /* | |
d063d709 DG |
4467 | * Setup sockets and directory needed by the kconsumerd communication with the |
4468 | * session daemon. | |
d6f42150 | 4469 | */ |
67e40797 DG |
4470 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4471 | const char *rundir) | |
d6f42150 DG |
4472 | { |
4473 | int ret; | |
67e40797 | 4474 | char path[PATH_MAX]; |
d6f42150 | 4475 | |
6c71277b | 4476 | switch (consumer_data->type) { |
7753dea8 | 4477 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4478 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4479 | break; |
4480 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4481 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4482 | break; |
4483 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4484 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4485 | break; |
4486 | default: | |
4487 | ERR("Consumer type unknown"); | |
4488 | ret = -EINVAL; | |
4489 | goto error; | |
d6f42150 DG |
4490 | } |
4491 | ||
67e40797 DG |
4492 | DBG2("Creating consumer directory: %s", path); |
4493 | ||
6c71277b | 4494 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP); |
d6f42150 | 4495 | if (ret < 0) { |
6beb2242 | 4496 | if (errno != EEXIST) { |
f11e84c2 | 4497 | PERROR("mkdir"); |
3bd1e081 | 4498 | ERR("Failed to create %s", path); |
6beb2242 DG |
4499 | goto error; |
4500 | } | |
f11e84c2 | 4501 | ret = -1; |
d6f42150 | 4502 | } |
6c71277b MD |
4503 | if (is_root) { |
4504 | ret = chown(path, 0, utils_get_group_id(tracing_group_name)); | |
4505 | if (ret < 0) { | |
4506 | ERR("Unable to set group on %s", path); | |
4507 | PERROR("chown"); | |
4508 | goto error; | |
4509 | } | |
4510 | } | |
d6f42150 DG |
4511 | |
4512 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4513 | consumer_data->err_sock = |
4514 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4515 | if (consumer_data->err_sock < 0) { | |
4516 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4517 | ret = -1; |
4518 | goto error; | |
4519 | } | |
4520 | ||
a24f05ab MD |
4521 | /* |
4522 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4523 | * show must go on. | |
4524 | */ | |
4525 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
4526 | if (ret < 0) { | |
4527 | PERROR("utils_set_fd_cloexec"); | |
4528 | /* continue anyway */ | |
4529 | } | |
4530 | ||
d6f42150 | 4531 | /* File permission MUST be 660 */ |
3bd1e081 | 4532 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4533 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4534 | if (ret < 0) { |
3bd1e081 | 4535 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4536 | PERROR("chmod"); |
d6f42150 DG |
4537 | goto error; |
4538 | } | |
4539 | ||
4540 | error: | |
4541 | return ret; | |
4542 | } | |
4543 | ||
fac6795d | 4544 | /* |
d063d709 | 4545 | * Signal handler for the daemon |
cf3af59e | 4546 | * |
54d01ffb DG |
4547 | * Simply stop all worker threads, leaving main() return gracefully after |
4548 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4549 | */ |
4550 | static void sighandler(int sig) | |
4551 | { | |
4552 | switch (sig) { | |
cf3af59e | 4553 | case SIGPIPE: |
af87c45a | 4554 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4555 | return; |
4556 | case SIGINT: | |
af87c45a | 4557 | DBG("SIGINT caught"); |
cf3af59e MD |
4558 | stop_threads(); |
4559 | break; | |
4560 | case SIGTERM: | |
af87c45a | 4561 | DBG("SIGTERM caught"); |
cf3af59e MD |
4562 | stop_threads(); |
4563 | break; | |
0bb7724a DG |
4564 | case SIGUSR1: |
4565 | CMM_STORE_SHARED(recv_child_signal, 1); | |
4566 | break; | |
cf3af59e MD |
4567 | default: |
4568 | break; | |
fac6795d | 4569 | } |
fac6795d DG |
4570 | } |
4571 | ||
4572 | /* | |
d063d709 | 4573 | * Setup signal handler for : |
1d4b027a | 4574 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4575 | */ |
1d4b027a | 4576 | static int set_signal_handler(void) |
fac6795d | 4577 | { |
1d4b027a DG |
4578 | int ret = 0; |
4579 | struct sigaction sa; | |
4580 | sigset_t sigset; | |
fac6795d | 4581 | |
1d4b027a | 4582 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4583 | PERROR("sigemptyset"); |
1d4b027a DG |
4584 | return ret; |
4585 | } | |
d6f42150 | 4586 | |
1d4b027a DG |
4587 | sa.sa_handler = sighandler; |
4588 | sa.sa_mask = sigset; | |
4589 | sa.sa_flags = 0; | |
4590 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4591 | PERROR("sigaction"); |
1d4b027a | 4592 | return ret; |
d6f42150 DG |
4593 | } |
4594 | ||
1d4b027a | 4595 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4596 | PERROR("sigaction"); |
1d4b027a | 4597 | return ret; |
d6f42150 | 4598 | } |
aaf26714 | 4599 | |
1d4b027a | 4600 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4601 | PERROR("sigaction"); |
1d4b027a | 4602 | return ret; |
8c0faa1d DG |
4603 | } |
4604 | ||
0bb7724a DG |
4605 | if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) { |
4606 | PERROR("sigaction"); | |
4607 | return ret; | |
4608 | } | |
4609 | ||
4610 | DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT"); | |
1d4b027a DG |
4611 | |
4612 | return ret; | |
fac6795d DG |
4613 | } |
4614 | ||
f3ed775e | 4615 | /* |
d063d709 DG |
4616 | * Set open files limit to unlimited. This daemon can open a large number of |
4617 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4618 | */ |
4619 | static void set_ulimit(void) | |
4620 | { | |
4621 | int ret; | |
4622 | struct rlimit lim; | |
4623 | ||
a88df331 | 4624 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4625 | lim.rlim_cur = 65535; |
4626 | lim.rlim_max = 65535; | |
4627 | ||
4628 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4629 | if (ret < 0) { | |
76d7553f | 4630 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4631 | } |
4632 | } | |
4633 | ||
35f90c40 DG |
4634 | /* |
4635 | * Write pidfile using the rundir and opt_pidfile. | |
4636 | */ | |
4637 | static void write_pidfile(void) | |
4638 | { | |
4639 | int ret; | |
4640 | char pidfile_path[PATH_MAX]; | |
4641 | ||
4642 | assert(rundir); | |
4643 | ||
4644 | if (opt_pidfile) { | |
4645 | strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path)); | |
4646 | } else { | |
4647 | /* Build pidfile path from rundir and opt_pidfile. */ | |
4648 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
4649 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
4650 | if (ret < 0) { | |
4651 | PERROR("snprintf pidfile path"); | |
4652 | goto error; | |
4653 | } | |
4654 | } | |
4655 | ||
4656 | /* | |
4657 | * Create pid file in rundir. Return value is of no importance. The | |
4658 | * execution will continue even though we are not able to write the file. | |
4659 | */ | |
4660 | (void) utils_create_pid_file(getpid(), pidfile_path); | |
4661 | ||
4662 | error: | |
4663 | return; | |
4664 | } | |
4665 | ||
cd9290dd DG |
4666 | /* |
4667 | * Write JUL TCP port using the rundir. | |
4668 | */ | |
4669 | static void write_julport(void) | |
4670 | { | |
4671 | int ret; | |
4672 | char path[PATH_MAX]; | |
4673 | ||
4674 | assert(rundir); | |
4675 | ||
4676 | ret = snprintf(path, sizeof(path), "%s/" | |
4677 | DEFAULT_LTTNG_SESSIOND_JULPORT_FILE, rundir); | |
4678 | if (ret < 0) { | |
4679 | PERROR("snprintf julport path"); | |
4680 | goto error; | |
4681 | } | |
4682 | ||
4683 | /* | |
4684 | * Create TCP JUL port file in rundir. Return value is of no importance. | |
4685 | * The execution will continue even though we are not able to write the | |
4686 | * file. | |
4687 | */ | |
4688 | (void) utils_create_pid_file(jul_tcp_port, path); | |
4689 | ||
4690 | error: | |
4691 | return; | |
4692 | } | |
4693 | ||
0bb7724a DG |
4694 | /* |
4695 | * Daemonize this process by forking and making the parent wait for the child | |
4696 | * to signal it indicating readiness. Once received, the parent successfully | |
4697 | * quits. | |
4698 | * | |
4699 | * The child process undergoes the same action that daemon(3) does meaning | |
4700 | * setsid, chdir, and dup /dev/null into 0, 1 and 2. | |
4701 | * | |
4702 | * Return 0 on success else -1 on error. | |
4703 | */ | |
4704 | static int daemonize(void) | |
4705 | { | |
4706 | int ret; | |
4707 | pid_t pid; | |
4708 | ||
4709 | /* Get parent pid of this process. */ | |
4710 | child_ppid = getppid(); | |
4711 | ||
4712 | pid = fork(); | |
4713 | if (pid < 0) { | |
4714 | PERROR("fork"); | |
4715 | goto error; | |
4716 | } else if (pid == 0) { | |
4717 | int fd; | |
4718 | pid_t sid; | |
4719 | ||
4720 | /* Child */ | |
4721 | ||
4722 | /* | |
4723 | * Get the newly created parent pid so we can signal that process when | |
4724 | * we are ready to operate. | |
4725 | */ | |
4726 | child_ppid = getppid(); | |
4727 | ||
4728 | sid = setsid(); | |
4729 | if (sid < 0) { | |
4730 | PERROR("setsid"); | |
4731 | goto error; | |
4732 | } | |
4733 | ||
4734 | /* Try to change directory to /. If we can't well at least notify. */ | |
4735 | ret = chdir("/"); | |
4736 | if (ret < 0) { | |
4737 | PERROR("chdir"); | |
4738 | } | |
4739 | ||
4740 | fd = open(_PATH_DEVNULL, O_RDWR, 0); | |
4741 | if (fd < 0) { | |
4742 | PERROR("open %s", _PATH_DEVNULL); | |
4743 | /* Let 0, 1 and 2 open since we can't bind them to /dev/null. */ | |
4744 | } else { | |
4745 | (void) dup2(fd, STDIN_FILENO); | |
4746 | (void) dup2(fd, STDOUT_FILENO); | |
4747 | (void) dup2(fd, STDERR_FILENO); | |
4748 | if (fd > 2) { | |
4749 | ret = close(fd); | |
4750 | if (ret < 0) { | |
4751 | PERROR("close"); | |
4752 | } | |
4753 | } | |
4754 | } | |
4755 | goto end; | |
4756 | } else { | |
4757 | /* Parent */ | |
4758 | ||
4759 | /* | |
4760 | * Waiting for child to notify this parent that it can exit. Note that | |
4761 | * sleep() is interrupted before the 1 second delay as soon as the | |
4762 | * signal is received, so it will not cause visible delay for the | |
4763 | * user. | |
4764 | */ | |
4765 | while (!CMM_LOAD_SHARED(recv_child_signal)) { | |
077df0b3 DG |
4766 | int status; |
4767 | pid_t ret; | |
4768 | ||
4769 | /* | |
4770 | * Check if child exists without blocking. If so, we have to stop | |
4771 | * this parent process and return an error. | |
4772 | */ | |
4773 | ret = waitpid(pid, &status, WNOHANG); | |
4774 | if (ret < 0 || (ret != 0 && WIFEXITED(status))) { | |
4775 | /* The child exited somehow or was not valid. */ | |
4776 | goto error; | |
4777 | } | |
0bb7724a DG |
4778 | sleep(1); |
4779 | } | |
4780 | ||
4781 | /* | |
4782 | * From this point on, the parent can exit and the child is now an | |
4783 | * operationnal session daemon ready to serve clients and applications. | |
4784 | */ | |
4785 | exit(EXIT_SUCCESS); | |
4786 | } | |
4787 | ||
4788 | end: | |
4789 | return 0; | |
4790 | ||
4791 | error: | |
4792 | return -1; | |
4793 | } | |
4794 | ||
fac6795d DG |
4795 | /* |
4796 | * main | |
4797 | */ | |
4798 | int main(int argc, char **argv) | |
4799 | { | |
fac6795d DG |
4800 | int ret = 0; |
4801 | void *status; | |
ae9e45b3 | 4802 | const char *home_path, *env_app_timeout; |
fac6795d | 4803 | |
335a95b7 MD |
4804 | init_kernel_workarounds(); |
4805 | ||
f6a9efaa DG |
4806 | rcu_register_thread(); |
4807 | ||
0bb7724a DG |
4808 | if ((ret = set_signal_handler()) < 0) { |
4809 | goto error; | |
4810 | } | |
4811 | ||
7753dea8 | 4812 | setup_consumerd_path(); |
fb09408a | 4813 | |
12744796 DG |
4814 | page_size = sysconf(_SC_PAGESIZE); |
4815 | if (page_size < 0) { | |
4816 | PERROR("sysconf _SC_PAGESIZE"); | |
4817 | page_size = LONG_MAX; | |
4818 | WARN("Fallback page size to %ld", page_size); | |
4819 | } | |
4820 | ||
26296c48 | 4821 | /* Parse arguments and load the daemon configuration file */ |
fac6795d | 4822 | progname = argv[0]; |
26296c48 | 4823 | if ((ret = set_options(argc, argv)) < 0) { |
cf3af59e | 4824 | goto error; |
fac6795d DG |
4825 | } |
4826 | ||
4827 | /* Daemonize */ | |
4828 | if (opt_daemon) { | |
ceed52b5 MD |
4829 | int i; |
4830 | ||
0bb7724a | 4831 | ret = daemonize(); |
53094c05 | 4832 | if (ret < 0) { |
cf3af59e | 4833 | goto error; |
53094c05 | 4834 | } |
0bb7724a | 4835 | |
ceed52b5 | 4836 | /* |
0bb7724a DG |
4837 | * We are in the child. Make sure all other file descriptors are |
4838 | * closed, in case we are called with more opened file descriptors than | |
4839 | * the standard ones. | |
ceed52b5 MD |
4840 | */ |
4841 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
4842 | (void) close(i); | |
4843 | } | |
4844 | } | |
4845 | ||
4846 | /* Create thread quit pipe */ | |
4847 | if ((ret = init_thread_quit_pipe()) < 0) { | |
4848 | goto error; | |
fac6795d DG |
4849 | } |
4850 | ||
4851 | /* Check if daemon is UID = 0 */ | |
4852 | is_root = !getuid(); | |
4853 | ||
fac6795d | 4854 | if (is_root) { |
990570ed | 4855 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4856 | |
4857 | /* Create global run dir with root access */ | |
4858 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4859 | if (ret < 0) { |
cf3af59e | 4860 | goto error; |
d6f42150 DG |
4861 | } |
4862 | ||
fac6795d | 4863 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4864 | snprintf(apps_unix_sock_path, PATH_MAX, |
4865 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4866 | } |
4867 | ||
4868 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4869 | snprintf(client_unix_sock_path, PATH_MAX, |
4870 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4871 | } | |
0fdd1e2c DG |
4872 | |
4873 | /* Set global SHM for ust */ | |
4874 | if (strlen(wait_shm_path) == 0) { | |
4875 | snprintf(wait_shm_path, PATH_MAX, | |
4876 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4877 | } | |
67e40797 | 4878 | |
44a5e5eb DG |
4879 | if (strlen(health_unix_sock_path) == 0) { |
4880 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4881 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
4882 | } | |
4883 | ||
67e40797 DG |
4884 | /* Setup kernel consumerd path */ |
4885 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4886 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4887 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4888 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4889 | |
4890 | DBG2("Kernel consumer err path: %s", | |
4891 | kconsumer_data.err_unix_sock_path); | |
4892 | DBG2("Kernel consumer cmd path: %s", | |
4893 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4894 | } else { |
feb0f3e5 | 4895 | home_path = utils_get_home_dir(); |
b082db07 | 4896 | if (home_path == NULL) { |
273ea72c DG |
4897 | /* TODO: Add --socket PATH option */ |
4898 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4899 | ret = -EPERM; |
4900 | goto error; | |
b082db07 DG |
4901 | } |
4902 | ||
67e40797 DG |
4903 | /* |
4904 | * Create rundir from home path. This will create something like | |
4905 | * $HOME/.lttng | |
4906 | */ | |
990570ed | 4907 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4908 | if (ret < 0) { |
4909 | ret = -ENOMEM; | |
4910 | goto error; | |
4911 | } | |
4912 | ||
4913 | ret = create_lttng_rundir(rundir); | |
4914 | if (ret < 0) { | |
4915 | goto error; | |
4916 | } | |
4917 | ||
fac6795d | 4918 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4919 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4920 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4921 | } |
4922 | ||
4923 | /* Set the cli tool unix socket path */ | |
4924 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4925 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4926 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4927 | } |
0fdd1e2c DG |
4928 | |
4929 | /* Set global SHM for ust */ | |
4930 | if (strlen(wait_shm_path) == 0) { | |
4931 | snprintf(wait_shm_path, PATH_MAX, | |
d0b96690 | 4932 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); |
0fdd1e2c | 4933 | } |
44a5e5eb DG |
4934 | |
4935 | /* Set health check Unix path */ | |
4936 | if (strlen(health_unix_sock_path) == 0) { | |
4937 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4938 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
4939 | } | |
fac6795d DG |
4940 | } |
4941 | ||
5c827ce0 DG |
4942 | /* Set consumer initial state */ |
4943 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4944 | ust_consumerd_state = CONSUMER_STOPPED; | |
4945 | ||
847177cd DG |
4946 | DBG("Client socket path %s", client_unix_sock_path); |
4947 | DBG("Application socket path %s", apps_unix_sock_path); | |
d0b96690 | 4948 | DBG("Application wait path %s", wait_shm_path); |
67e40797 DG |
4949 | DBG("LTTng run directory path: %s", rundir); |
4950 | ||
4951 | /* 32 bits consumerd path setup */ | |
4952 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4953 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4954 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4955 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4956 | |
4957 | DBG2("UST consumer 32 bits err path: %s", | |
4958 | ustconsumer32_data.err_unix_sock_path); | |
4959 | DBG2("UST consumer 32 bits cmd path: %s", | |
4960 | ustconsumer32_data.cmd_unix_sock_path); | |
4961 | ||
4962 | /* 64 bits consumerd path setup */ | |
4963 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4964 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4965 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4966 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4967 | |
4968 | DBG2("UST consumer 64 bits err path: %s", | |
4969 | ustconsumer64_data.err_unix_sock_path); | |
4970 | DBG2("UST consumer 64 bits cmd path: %s", | |
4971 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4972 | |
273ea72c | 4973 | /* |
7d8234d9 | 4974 | * See if daemon already exist. |
fac6795d | 4975 | */ |
7d8234d9 | 4976 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4977 | ERR("Already running daemon.\n"); |
273ea72c | 4978 | /* |
cf3af59e MD |
4979 | * We do not goto exit because we must not cleanup() |
4980 | * because a daemon is already running. | |
ab118b20 | 4981 | */ |
cf3af59e | 4982 | goto error; |
a88df331 DG |
4983 | } |
4984 | ||
1427f9b2 DG |
4985 | /* |
4986 | * Init UST app hash table. Alloc hash table before this point since | |
4987 | * cleanup() can get called after that point. | |
4988 | */ | |
4989 | ust_app_ht_alloc(); | |
4990 | ||
f20baf8e DG |
4991 | /* Initialize JUL domain subsystem. */ |
4992 | if ((ret = jul_init()) < 0) { | |
4993 | /* ENOMEM at this point. */ | |
4994 | goto error; | |
4995 | } | |
4996 | ||
54d01ffb | 4997 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4998 | |
4999 | /* | |
5000 | * These actions must be executed as root. We do that *after* setting up | |
5001 | * the sockets path because we MUST make the check for another daemon using | |
5002 | * those paths *before* trying to set the kernel consumer sockets and init | |
5003 | * kernel tracer. | |
5004 | */ | |
5005 | if (is_root) { | |
67e40797 | 5006 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
5007 | if (ret < 0) { |
5008 | goto exit; | |
5009 | } | |
5010 | ||
a88df331 | 5011 | /* Setup kernel tracer */ |
4fba7219 DG |
5012 | if (!opt_no_kernel) { |
5013 | init_kernel_tracer(); | |
5014 | } | |
a88df331 DG |
5015 | |
5016 | /* Set ulimit for open files */ | |
5017 | set_ulimit(); | |
fac6795d | 5018 | } |
4063050c MD |
5019 | /* init lttng_fd tracking must be done after set_ulimit. */ |
5020 | lttng_fd_init(); | |
fac6795d | 5021 | |
67e40797 DG |
5022 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
5023 | if (ret < 0) { | |
5024 | goto exit; | |
5025 | } | |
5026 | ||
5027 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
5028 | if (ret < 0) { | |
5029 | goto exit; | |
5030 | } | |
5031 | ||
d6f42150 | 5032 | /* Setup the needed unix socket */ |
cf3af59e MD |
5033 | if ((ret = init_daemon_socket()) < 0) { |
5034 | goto exit; | |
fac6795d DG |
5035 | } |
5036 | ||
5037 | /* Set credentials to socket */ | |
be040666 | 5038 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 5039 | goto exit; |
fac6795d DG |
5040 | } |
5041 | ||
5b8719f5 DG |
5042 | /* Get parent pid if -S, --sig-parent is specified. */ |
5043 | if (opt_sig_parent) { | |
5044 | ppid = getppid(); | |
5045 | } | |
5046 | ||
7a485870 | 5047 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 DG |
5048 | if (is_root && !opt_no_kernel) { |
5049 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { | |
5050 | goto exit; | |
5051 | } | |
7a485870 DG |
5052 | } |
5053 | ||
0b2dc8df MD |
5054 | /* Setup the thread ht_cleanup communication pipe. */ |
5055 | if (utils_create_pipe_cloexec(ht_cleanup_pipe) < 0) { | |
5056 | goto exit; | |
5057 | } | |
5058 | ||
099e26bd | 5059 | /* Setup the thread apps communication pipe. */ |
ef599319 | 5060 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
5061 | goto exit; |
5062 | } | |
5063 | ||
d0b96690 DG |
5064 | /* Setup the thread apps notify communication pipe. */ |
5065 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) { | |
5066 | goto exit; | |
5067 | } | |
5068 | ||
7972aab2 DG |
5069 | /* Initialize global buffer per UID and PID registry. */ |
5070 | buffer_reg_init_uid_registry(); | |
5071 | buffer_reg_init_pid_registry(); | |
5072 | ||
099e26bd DG |
5073 | /* Init UST command queue. */ |
5074 | cds_wfq_init(&ust_cmd_queue.queue); | |
5075 | ||
273ea72c | 5076 | /* |
54d01ffb DG |
5077 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
5078 | * statically declared in session.c | |
273ea72c | 5079 | */ |
54d01ffb | 5080 | session_list_ptr = session_get_list(); |
b5541356 | 5081 | |
5eb91c98 DG |
5082 | /* Set up max poll set size */ |
5083 | lttng_poll_set_max_size(); | |
5084 | ||
2f77fc4b | 5085 | cmd_init(); |
00e2e675 | 5086 | |
ae9e45b3 DG |
5087 | /* Check for the application socket timeout env variable. */ |
5088 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
5089 | if (env_app_timeout) { | |
5090 | app_socket_timeout = atoi(env_app_timeout); | |
5091 | } else { | |
5092 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
5093 | } | |
5094 | ||
35f90c40 | 5095 | write_pidfile(); |
cd9290dd | 5096 | write_julport(); |
35f90c40 | 5097 | |
554831e7 MD |
5098 | /* Initialize communication library */ |
5099 | lttcomm_init(); | |
d831c249 DG |
5100 | /* This is to get the TCP timeout value. */ |
5101 | lttcomm_inet_init(); | |
554831e7 | 5102 | |
67e05644 DG |
5103 | /* |
5104 | * Initialize the health check subsystem. This call should set the | |
5105 | * appropriate time values. | |
5106 | */ | |
6c71277b | 5107 | health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES); |
8782cc74 MD |
5108 | if (!health_sessiond) { |
5109 | PERROR("health_app_create error"); | |
5110 | goto exit_health_sessiond_cleanup; | |
5111 | } | |
67e05644 | 5112 | |
d5b9fd2f | 5113 | /* Create thread to clean up RCU hash tables */ |
0b2dc8df MD |
5114 | ret = pthread_create(&ht_cleanup_thread, NULL, |
5115 | thread_ht_cleanup, (void *) NULL); | |
5116 | if (ret != 0) { | |
5117 | PERROR("pthread_create ht_cleanup"); | |
5118 | goto exit_ht_cleanup; | |
5119 | } | |
5120 | ||
d5b9fd2f | 5121 | /* Create health-check thread */ |
44a5e5eb DG |
5122 | ret = pthread_create(&health_thread, NULL, |
5123 | thread_manage_health, (void *) NULL); | |
5124 | if (ret != 0) { | |
5125 | PERROR("pthread_create health"); | |
5126 | goto exit_health; | |
5127 | } | |
5128 | ||
cf3af59e | 5129 | /* Create thread to manage the client socket */ |
099e26bd DG |
5130 | ret = pthread_create(&client_thread, NULL, |
5131 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 5132 | if (ret != 0) { |
76d7553f | 5133 | PERROR("pthread_create clients"); |
cf3af59e MD |
5134 | goto exit_client; |
5135 | } | |
fac6795d | 5136 | |
099e26bd DG |
5137 | /* Create thread to dispatch registration */ |
5138 | ret = pthread_create(&dispatch_thread, NULL, | |
5139 | thread_dispatch_ust_registration, (void *) NULL); | |
5140 | if (ret != 0) { | |
76d7553f | 5141 | PERROR("pthread_create dispatch"); |
099e26bd DG |
5142 | goto exit_dispatch; |
5143 | } | |
5144 | ||
5145 | /* Create thread to manage application registration. */ | |
5146 | ret = pthread_create(®_apps_thread, NULL, | |
5147 | thread_registration_apps, (void *) NULL); | |
5148 | if (ret != 0) { | |
76d7553f | 5149 | PERROR("pthread_create registration"); |
099e26bd DG |
5150 | goto exit_reg_apps; |
5151 | } | |
5152 | ||
cf3af59e | 5153 | /* Create thread to manage application socket */ |
54d01ffb DG |
5154 | ret = pthread_create(&apps_thread, NULL, |
5155 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 5156 | if (ret != 0) { |
d0b96690 DG |
5157 | PERROR("pthread_create apps"); |
5158 | goto exit_apps; | |
5159 | } | |
5160 | ||
5161 | /* Create thread to manage application notify socket */ | |
5162 | ret = pthread_create(&apps_notify_thread, NULL, | |
5163 | ust_thread_manage_notify, (void *) NULL); | |
5164 | if (ret != 0) { | |
76d7553f | 5165 | PERROR("pthread_create apps"); |
9563b0ad | 5166 | goto exit_apps_notify; |
cf3af59e | 5167 | } |
fac6795d | 5168 | |
4d076222 DG |
5169 | /* Create JUL registration thread. */ |
5170 | ret = pthread_create(&jul_reg_thread, NULL, | |
5171 | jul_thread_manage_registration, (void *) NULL); | |
5172 | if (ret != 0) { | |
5173 | PERROR("pthread_create apps"); | |
5174 | goto exit_jul_reg; | |
5175 | } | |
5176 | ||
6620da75 DG |
5177 | /* Don't start this thread if kernel tracing is not requested nor root */ |
5178 | if (is_root && !opt_no_kernel) { | |
5179 | /* Create kernel thread to manage kernel event */ | |
5180 | ret = pthread_create(&kernel_thread, NULL, | |
5181 | thread_manage_kernel, (void *) NULL); | |
5182 | if (ret != 0) { | |
5183 | PERROR("pthread_create kernel"); | |
5184 | goto exit_kernel; | |
5185 | } | |
7a485870 | 5186 | |
6620da75 DG |
5187 | ret = pthread_join(kernel_thread, &status); |
5188 | if (ret != 0) { | |
5189 | PERROR("pthread_join"); | |
5190 | goto error; /* join error, exit without cleanup */ | |
5191 | } | |
fac6795d DG |
5192 | } |
5193 | ||
cf3af59e | 5194 | exit_kernel: |
4d076222 DG |
5195 | ret = pthread_join(jul_reg_thread, &status); |
5196 | if (ret != 0) { | |
5197 | PERROR("pthread_join JUL"); | |
5198 | goto error; /* join error, exit without cleanup */ | |
5199 | } | |
5200 | ||
5201 | exit_jul_reg: | |
9563b0ad DG |
5202 | ret = pthread_join(apps_notify_thread, &status); |
5203 | if (ret != 0) { | |
5204 | PERROR("pthread_join apps notify"); | |
5205 | goto error; /* join error, exit without cleanup */ | |
5206 | } | |
5207 | ||
5208 | exit_apps_notify: | |
cf3af59e MD |
5209 | ret = pthread_join(apps_thread, &status); |
5210 | if (ret != 0) { | |
9563b0ad | 5211 | PERROR("pthread_join apps"); |
cf3af59e MD |
5212 | goto error; /* join error, exit without cleanup */ |
5213 | } | |
fac6795d | 5214 | |
4ccd8c8f | 5215 | |
cf3af59e | 5216 | exit_apps: |
099e26bd DG |
5217 | ret = pthread_join(reg_apps_thread, &status); |
5218 | if (ret != 0) { | |
76d7553f | 5219 | PERROR("pthread_join"); |
099e26bd DG |
5220 | goto error; /* join error, exit without cleanup */ |
5221 | } | |
5222 | ||
5223 | exit_reg_apps: | |
5224 | ret = pthread_join(dispatch_thread, &status); | |
5225 | if (ret != 0) { | |
76d7553f | 5226 | PERROR("pthread_join"); |
099e26bd DG |
5227 | goto error; /* join error, exit without cleanup */ |
5228 | } | |
5229 | ||
5230 | exit_dispatch: | |
cf3af59e MD |
5231 | ret = pthread_join(client_thread, &status); |
5232 | if (ret != 0) { | |
76d7553f | 5233 | PERROR("pthread_join"); |
cf3af59e MD |
5234 | goto error; /* join error, exit without cleanup */ |
5235 | } | |
5236 | ||
3bd1e081 | 5237 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 5238 | if (ret != 0) { |
76d7553f | 5239 | PERROR("join_consumer"); |
cf3af59e MD |
5240 | goto error; /* join error, exit without cleanup */ |
5241 | } | |
a88df331 | 5242 | |
06f525de DG |
5243 | ret = join_consumer_thread(&ustconsumer32_data); |
5244 | if (ret != 0) { | |
5245 | PERROR("join_consumer ust32"); | |
5246 | goto error; /* join error, exit without cleanup */ | |
5247 | } | |
5248 | ||
5249 | ret = join_consumer_thread(&ustconsumer64_data); | |
5250 | if (ret != 0) { | |
5251 | PERROR("join_consumer ust64"); | |
5252 | goto error; /* join error, exit without cleanup */ | |
5253 | } | |
5254 | ||
cf3af59e | 5255 | exit_client: |
06f525de DG |
5256 | ret = pthread_join(health_thread, &status); |
5257 | if (ret != 0) { | |
5258 | PERROR("pthread_join health thread"); | |
5259 | goto error; /* join error, exit without cleanup */ | |
5260 | } | |
5261 | ||
44a5e5eb | 5262 | exit_health: |
0b2dc8df MD |
5263 | ret = pthread_join(ht_cleanup_thread, &status); |
5264 | if (ret != 0) { | |
5265 | PERROR("pthread_join ht cleanup thread"); | |
5266 | goto error; /* join error, exit without cleanup */ | |
5267 | } | |
5268 | exit_ht_cleanup: | |
8782cc74 MD |
5269 | health_app_destroy(health_sessiond); |
5270 | exit_health_sessiond_cleanup: | |
a88df331 | 5271 | exit: |
cf3af59e MD |
5272 | /* |
5273 | * cleanup() is called when no other thread is running. | |
5274 | */ | |
f6a9efaa | 5275 | rcu_thread_online(); |
cf3af59e | 5276 | cleanup(); |
f6a9efaa DG |
5277 | rcu_thread_offline(); |
5278 | rcu_unregister_thread(); | |
67e40797 | 5279 | if (!ret) { |
cf3af59e | 5280 | exit(EXIT_SUCCESS); |
67e40797 | 5281 | } |
cf3af59e | 5282 | error: |
5e16da05 | 5283 | exit(EXIT_FAILURE); |
fac6795d | 5284 | } |