Commit | Line | Data |
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826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
26296c48 | 4 | * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
fac6795d | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
91d76f53 | 9 | * |
d14d33bf AM |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
91d76f53 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
18 | */ |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
fac6795d DG |
21 | #include <getopt.h> |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
0bb7724a | 24 | #include <paths.h> |
fac6795d DG |
25 | #include <pthread.h> |
26 | #include <signal.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
331744e3 | 30 | #include <inttypes.h> |
0fdd1e2c | 31 | #include <sys/mman.h> |
b73401da | 32 | #include <sys/mount.h> |
1e307fab | 33 | #include <sys/resource.h> |
fac6795d DG |
34 | #include <sys/socket.h> |
35 | #include <sys/stat.h> | |
36 | #include <sys/types.h> | |
0fdd1e2c | 37 | #include <sys/wait.h> |
5c827ce0 | 38 | #include <urcu/uatomic.h> |
fac6795d | 39 | #include <unistd.h> |
4f0b90ee | 40 | #include <ctype.h> |
fac6795d | 41 | |
990570ed | 42 | #include <common/common.h> |
d27c42b8 | 43 | #include <common/compat/socket.h> |
e8fa9fb0 | 44 | #include <common/compat/getenv.h> |
db758600 DG |
45 | #include <common/defaults.h> |
46 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 47 | #include <common/futex.h> |
00e2e675 | 48 | #include <common/relayd/relayd.h> |
81b86775 | 49 | #include <common/utils.h> |
3ccdf997 | 50 | #include <common/daemonize.h> |
f40ef1d5 | 51 | #include <common/config/session-config.h> |
fac6795d | 52 | |
10a8a223 | 53 | #include "lttng-sessiond.h" |
7972aab2 | 54 | #include "buffer-registry.h" |
54d01ffb | 55 | #include "channel.h" |
2f77fc4b | 56 | #include "cmd.h" |
00e2e675 | 57 | #include "consumer.h" |
099e26bd | 58 | #include "context.h" |
54d01ffb | 59 | #include "event.h" |
4771f025 | 60 | #include "kernel.h" |
f1e16794 | 61 | #include "kernel-consumer.h" |
096102bd | 62 | #include "modprobe.h" |
0fdd1e2c | 63 | #include "shm.h" |
1e307fab | 64 | #include "ust-ctl.h" |
00e2e675 | 65 | #include "ust-consumer.h" |
8e68d1c8 | 66 | #include "utils.h" |
4063050c | 67 | #include "fd-limit.h" |
8782cc74 | 68 | #include "health-sessiond.h" |
8ac94142 | 69 | #include "testpoint.h" |
d0b96690 | 70 | #include "ust-thread.h" |
022d91ba | 71 | #include "agent-thread.h" |
fb198a11 | 72 | #include "save.h" |
ef367a93 | 73 | #include "load-session-thread.h" |
834978fd | 74 | #include "syscall.h" |
7c1d2758 | 75 | #include "agent.h" |
5e97de00 | 76 | #include "ht-cleanup.h" |
fac6795d | 77 | |
ebaeda94 MD |
78 | #define CONSUMERD_FILE "lttng-consumerd" |
79 | ||
fac6795d | 80 | const char *progname; |
6c71277b | 81 | static const char *tracing_group_name = DEFAULT_TRACING_GROUP; |
26296c48 JG |
82 | static int tracing_group_name_override; |
83 | static char *opt_pidfile; | |
5b8719f5 | 84 | static int opt_sig_parent; |
97e19046 | 85 | static int opt_verbose_consumer; |
72dd7491 | 86 | static int opt_daemon, opt_background; |
4fba7219 | 87 | static int opt_no_kernel; |
ef367a93 | 88 | static char *opt_load_session_path; |
1d4b027a | 89 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
0bb7724a | 90 | static pid_t child_ppid; /* Internal parent PID use with daemonize. */ |
67e40797 | 91 | static char *rundir; |
c9cb3e7d | 92 | static int lockfile_fd = -1; |
3bd1e081 | 93 | |
0bb7724a DG |
94 | /* Set to 1 when a SIGUSR1 signal is received. */ |
95 | static int recv_child_signal; | |
96 | ||
a23ec3a7 DG |
97 | /* |
98 | * Consumer daemon specific control data. Every value not initialized here is | |
99 | * set to 0 by the static definition. | |
100 | */ | |
3bd1e081 MD |
101 | static struct consumer_data kconsumer_data = { |
102 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
103 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
104 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
105 | .err_sock = -1, |
106 | .cmd_sock = -1, | |
173af62f DG |
107 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
108 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
109 | .cond = PTHREAD_COND_INITIALIZER, |
110 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 111 | }; |
7753dea8 MD |
112 | static struct consumer_data ustconsumer64_data = { |
113 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
114 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
115 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
116 | .err_sock = -1, |
117 | .cmd_sock = -1, | |
173af62f DG |
118 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
119 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
120 | .cond = PTHREAD_COND_INITIALIZER, |
121 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
122 | }; |
123 | static struct consumer_data ustconsumer32_data = { | |
124 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
125 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
126 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
127 | .err_sock = -1, |
128 | .cmd_sock = -1, | |
173af62f DG |
129 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
130 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
131 | .cond = PTHREAD_COND_INITIALIZER, |
132 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
133 | }; |
134 | ||
26296c48 JG |
135 | /* Command line options */ |
136 | static const struct option long_options[] = { | |
0f5ea17c JG |
137 | { "client-sock", required_argument, 0, 'c' }, |
138 | { "apps-sock", required_argument, 0, 'a' }, | |
139 | { "kconsumerd-cmd-sock", required_argument, 0, '\0' }, | |
140 | { "kconsumerd-err-sock", required_argument, 0, '\0' }, | |
141 | { "ustconsumerd32-cmd-sock", required_argument, 0, '\0' }, | |
142 | { "ustconsumerd32-err-sock", required_argument, 0, '\0' }, | |
143 | { "ustconsumerd64-cmd-sock", required_argument, 0, '\0' }, | |
144 | { "ustconsumerd64-err-sock", required_argument, 0, '\0' }, | |
145 | { "consumerd32-path", required_argument, 0, '\0' }, | |
146 | { "consumerd32-libdir", required_argument, 0, '\0' }, | |
147 | { "consumerd64-path", required_argument, 0, '\0' }, | |
148 | { "consumerd64-libdir", required_argument, 0, '\0' }, | |
149 | { "daemonize", no_argument, 0, 'd' }, | |
150 | { "background", no_argument, 0, 'b' }, | |
151 | { "sig-parent", no_argument, 0, 'S' }, | |
152 | { "help", no_argument, 0, 'h' }, | |
153 | { "group", required_argument, 0, 'g' }, | |
154 | { "version", no_argument, 0, 'V' }, | |
155 | { "quiet", no_argument, 0, 'q' }, | |
156 | { "verbose", no_argument, 0, 'v' }, | |
157 | { "verbose-consumer", no_argument, 0, '\0' }, | |
158 | { "no-kernel", no_argument, 0, '\0' }, | |
159 | { "pidfile", required_argument, 0, 'p' }, | |
160 | { "agent-tcp-port", required_argument, 0, '\0' }, | |
161 | { "config", required_argument, 0, 'f' }, | |
162 | { "load", required_argument, 0, 'l' }, | |
163 | { "kmod-probes", required_argument, 0, '\0' }, | |
164 | { "extra-kmod-probes", required_argument, 0, '\0' }, | |
26296c48 JG |
165 | { NULL, 0, 0, 0 } |
166 | }; | |
167 | ||
168 | /* Command line options to ignore from configuration file */ | |
169 | static const char *config_ignore_options[] = { "help", "version", "config" }; | |
170 | ||
26c9d55e | 171 | /* Shared between threads */ |
099e26bd | 172 | static int dispatch_thread_exit; |
fac6795d | 173 | |
54d01ffb DG |
174 | /* Global application Unix socket path */ |
175 | static char apps_unix_sock_path[PATH_MAX]; | |
176 | /* Global client Unix socket path */ | |
177 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
178 | /* global wait shm path for UST */ |
179 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
180 | /* Global health check unix path */ |
181 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 182 | |
1d4b027a | 183 | /* Sockets and FDs */ |
a4b35e07 MD |
184 | static int client_sock = -1; |
185 | static int apps_sock = -1; | |
2f77fc4b | 186 | int kernel_tracer_fd = -1; |
76d7553f | 187 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 188 | |
273ea72c DG |
189 | /* |
190 | * Quit pipe for all threads. This permits a single cancellation point | |
191 | * for all threads when receiving an event on the pipe. | |
192 | */ | |
76d7553f | 193 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 194 | |
099e26bd DG |
195 | /* |
196 | * This pipe is used to inform the thread managing application communication | |
197 | * that a command is queued and ready to be processed. | |
198 | */ | |
76d7553f | 199 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 200 | |
d0b96690 DG |
201 | int apps_cmd_notify_pipe[2] = { -1, -1 }; |
202 | ||
1d4b027a | 203 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 204 | static pthread_t apps_thread; |
d0b96690 | 205 | static pthread_t apps_notify_thread; |
099e26bd | 206 | static pthread_t reg_apps_thread; |
1d4b027a | 207 | static pthread_t client_thread; |
7a485870 | 208 | static pthread_t kernel_thread; |
099e26bd | 209 | static pthread_t dispatch_thread; |
44a5e5eb | 210 | static pthread_t health_thread; |
0b2dc8df | 211 | static pthread_t ht_cleanup_thread; |
022d91ba | 212 | static pthread_t agent_reg_thread; |
ef367a93 | 213 | static pthread_t load_session_thread; |
5eb91c98 | 214 | |
099e26bd DG |
215 | /* |
216 | * UST registration command queue. This queue is tied with a futex and uses a N | |
217 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
218 | * | |
b22c5da8 DG |
219 | * The thread_registration_apps and thread_dispatch_ust_registration uses this |
220 | * queue along with the wait/wake scheme. The thread_manage_apps receives down | |
221 | * the line new application socket and monitors it for any I/O error or clean | |
222 | * close that triggers an unregistration of the application. | |
099e26bd DG |
223 | */ |
224 | static struct ust_cmd_queue ust_cmd_queue; | |
225 | ||
b5541356 DG |
226 | /* |
227 | * Pointer initialized before thread creation. | |
228 | * | |
229 | * This points to the tracing session list containing the session count and a | |
230 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
231 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 232 | * |
d063d709 | 233 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 234 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
235 | */ |
236 | static struct ltt_session_list *session_list_ptr; | |
237 | ||
7753dea8 MD |
238 | int ust_consumerd64_fd = -1; |
239 | int ust_consumerd32_fd = -1; | |
240 | ||
fb6f1fa2 YB |
241 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
242 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
243 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
244 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
26296c48 JG |
245 | static int consumerd32_bin_override; |
246 | static int consumerd64_bin_override; | |
247 | static int consumerd32_libdir_override; | |
248 | static int consumerd64_libdir_override; | |
fb09408a | 249 | |
2f77fc4b DG |
250 | static const char *module_proc_lttng = "/proc/lttng"; |
251 | ||
5c827ce0 DG |
252 | /* |
253 | * Consumer daemon state which is changed when spawning it, killing it or in | |
254 | * case of a fatal error. | |
255 | */ | |
256 | enum consumerd_state { | |
257 | CONSUMER_STARTED = 1, | |
258 | CONSUMER_STOPPED = 2, | |
259 | CONSUMER_ERROR = 3, | |
260 | }; | |
261 | ||
262 | /* | |
263 | * This consumer daemon state is used to validate if a client command will be | |
264 | * able to reach the consumer. If not, the client is informed. For instance, | |
265 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
266 | * error to the client. | |
267 | * | |
268 | * The following example shows a possible race condition of this scheme: | |
269 | * | |
270 | * consumer thread error happens | |
271 | * client cmd arrives | |
272 | * client cmd checks state -> still OK | |
273 | * consumer thread exit, sets error | |
274 | * client cmd try to talk to consumer | |
275 | * ... | |
276 | * | |
277 | * However, since the consumer is a different daemon, we have no way of making | |
278 | * sure the command will reach it safely even with this state flag. This is why | |
279 | * we consider that up to the state validation during command processing, the | |
280 | * command is safe. After that, we can not guarantee the correctness of the | |
281 | * client request vis-a-vis the consumer. | |
282 | */ | |
283 | static enum consumerd_state ust_consumerd_state; | |
284 | static enum consumerd_state kernel_consumerd_state; | |
285 | ||
ae9e45b3 DG |
286 | /* |
287 | * Socket timeout for receiving and sending in seconds. | |
288 | */ | |
289 | static int app_socket_timeout; | |
290 | ||
12744796 DG |
291 | /* Set in main() with the current page size. */ |
292 | long page_size; | |
293 | ||
8782cc74 MD |
294 | /* Application health monitoring */ |
295 | struct health_app *health_sessiond; | |
296 | ||
022d91ba DG |
297 | /* Agent TCP port for registration. Used by the agent thread. */ |
298 | unsigned int agent_tcp_port = DEFAULT_AGENT_TCP_PORT; | |
4d076222 | 299 | |
f43f95a9 DG |
300 | /* Am I root or not. */ |
301 | int is_root; /* Set to 1 if the daemon is running as root */ | |
302 | ||
26296c48 JG |
303 | const char * const config_section_name = "sessiond"; |
304 | ||
ef367a93 JG |
305 | /* Load session thread information to operate. */ |
306 | struct load_session_thread_data *load_info; | |
307 | ||
7c1d2758 JG |
308 | /* Global hash tables */ |
309 | struct lttng_ht *agent_apps_ht_by_sock = NULL; | |
310 | ||
97bc1426 | 311 | /* |
f15331c0 JG |
312 | * The initialization of the session daemon is done in multiple phases. |
313 | * | |
314 | * While all threads are launched near-simultaneously, only some of them | |
315 | * are needed to ensure the session daemon can start to respond to client | |
316 | * requests. | |
317 | * | |
318 | * There are two important guarantees that we wish to offer with respect | |
319 | * to the initialisation of the session daemon: | |
320 | * - When the daemonize/background launcher process exits, the sessiond | |
321 | * is fully able to respond to client requests, | |
322 | * - Auto-loaded sessions are visible to clients. | |
323 | * | |
324 | * In order to achieve this, a number of support threads have to be launched | |
325 | * to allow the "client" thread to function properly. Moreover, since the | |
326 | * "load session" thread needs the client thread, we must provide a way | |
327 | * for the "load session" thread to know that the "client" thread is up | |
328 | * and running. | |
329 | * | |
330 | * Hence, the support threads decrement the lttng_sessiond_ready counter | |
331 | * while the "client" threads waits for it to reach 0. Once the "client" thread | |
332 | * unblocks, it posts the message_thread_ready semaphore which allows the | |
333 | * "load session" thread to progress. | |
334 | * | |
335 | * This implies that the "load session" thread is the last to be initialized | |
336 | * and will explicitly call sessiond_signal_parents(), which signals the parents | |
337 | * that the session daemon is fully initialized. | |
338 | * | |
339 | * The two (2) support threads are: | |
340 | * - agent_thread | |
341 | * - health_thread | |
97bc1426 | 342 | */ |
f15331c0 | 343 | int lttng_sessiond_ready = 2; |
97bc1426 | 344 | |
5e97de00 JG |
345 | int sessiond_check_thread_quit_pipe(int fd, uint32_t events) |
346 | { | |
347 | return (fd == thread_quit_pipe[0] && (events & LPOLLIN)) ? 1 : 0; | |
348 | } | |
349 | ||
97bc1426 | 350 | /* Notify parents that we are ready for cmd and health check */ |
ef367a93 | 351 | LTTNG_HIDDEN |
f15331c0 | 352 | void sessiond_signal_parents(void) |
97bc1426 | 353 | { |
f15331c0 JG |
354 | /* |
355 | * Notify parent pid that we are ready to accept command | |
356 | * for client side. This ppid is the one from the | |
357 | * external process that spawned us. | |
358 | */ | |
359 | if (opt_sig_parent) { | |
360 | kill(ppid, SIGUSR1); | |
361 | } | |
97bc1426 | 362 | |
f15331c0 JG |
363 | /* |
364 | * Notify the parent of the fork() process that we are | |
365 | * ready. | |
366 | */ | |
367 | if (opt_daemon || opt_background) { | |
368 | kill(child_ppid, SIGUSR1); | |
97bc1426 MD |
369 | } |
370 | } | |
371 | ||
f15331c0 JG |
372 | LTTNG_HIDDEN |
373 | void sessiond_notify_ready(void) | |
374 | { | |
375 | /* | |
376 | * The _return variant is used since the implied memory barriers are | |
377 | * required. | |
378 | */ | |
379 | (void) uatomic_sub_return(<tng_sessiond_ready, 1); | |
380 | } | |
381 | ||
fb09408a | 382 | static |
7753dea8 | 383 | void setup_consumerd_path(void) |
fb09408a | 384 | { |
fc7a59ce | 385 | const char *bin, *libdir; |
fb09408a | 386 | |
7753dea8 MD |
387 | /* |
388 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
389 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
390 | * has not been defined. | |
7753dea8 | 391 | */ |
ebaeda94 | 392 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
393 | if (!consumerd32_bin[0]) { |
394 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
395 | } |
396 | if (!consumerd32_libdir[0]) { | |
397 | consumerd32_libdir = INSTALL_LIB_PATH; | |
398 | } | |
399 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
400 | if (!consumerd64_bin[0]) { |
401 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 402 | } |
ebaeda94 MD |
403 | if (!consumerd64_libdir[0]) { |
404 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
405 | } |
406 | #else | |
407 | #error "Unknown bitness" | |
408 | #endif | |
409 | ||
fb09408a MD |
410 | /* |
411 | * runtime env. var. overrides the build default. | |
412 | */ | |
e8fa9fb0 | 413 | bin = lttng_secure_getenv("LTTNG_CONSUMERD32_BIN"); |
fc7a59ce AM |
414 | if (bin) { |
415 | consumerd32_bin = bin; | |
7753dea8 | 416 | } |
e8fa9fb0 | 417 | bin = lttng_secure_getenv("LTTNG_CONSUMERD64_BIN"); |
fc7a59ce AM |
418 | if (bin) { |
419 | consumerd64_bin = bin; | |
ebaeda94 | 420 | } |
e8fa9fb0 | 421 | libdir = lttng_secure_getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
422 | if (libdir) { |
423 | consumerd32_libdir = libdir; | |
424 | } | |
e8fa9fb0 | 425 | libdir = lttng_secure_getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
426 | if (libdir) { |
427 | consumerd64_libdir = libdir; | |
fb09408a MD |
428 | } |
429 | } | |
430 | ||
4a15001e MD |
431 | static |
432 | int __sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size, | |
433 | int *a_pipe) | |
5eb91c98 DG |
434 | { |
435 | int ret; | |
436 | ||
d0b96690 | 437 | assert(events); |
5eb91c98 DG |
438 | |
439 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
440 | if (ret < 0) { | |
441 | goto error; | |
442 | } | |
443 | ||
444 | /* Add quit pipe */ | |
4a15001e | 445 | ret = lttng_poll_add(events, a_pipe[0], LPOLLIN | LPOLLERR); |
5eb91c98 DG |
446 | if (ret < 0) { |
447 | goto error; | |
448 | } | |
449 | ||
450 | return 0; | |
451 | ||
452 | error: | |
453 | return ret; | |
454 | } | |
455 | ||
4a15001e MD |
456 | /* |
457 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
458 | */ | |
459 | int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size) | |
460 | { | |
461 | return __sessiond_set_thread_pollset(events, size, thread_quit_pipe); | |
462 | } | |
463 | ||
273ea72c | 464 | /* |
5eb91c98 | 465 | * Init thread quit pipe. |
273ea72c DG |
466 | * |
467 | * Return -1 on error or 0 if all pipes are created. | |
468 | */ | |
4a15001e | 469 | static int __init_thread_quit_pipe(int *a_pipe) |
273ea72c | 470 | { |
730389d9 | 471 | int ret, i; |
273ea72c | 472 | |
4a15001e | 473 | ret = pipe(a_pipe); |
273ea72c | 474 | if (ret < 0) { |
730389d9 | 475 | PERROR("thread quit pipe"); |
273ea72c DG |
476 | goto error; |
477 | } | |
478 | ||
730389d9 | 479 | for (i = 0; i < 2; i++) { |
4a15001e | 480 | ret = fcntl(a_pipe[i], F_SETFD, FD_CLOEXEC); |
730389d9 DG |
481 | if (ret < 0) { |
482 | PERROR("fcntl"); | |
483 | goto error; | |
484 | } | |
485 | } | |
486 | ||
273ea72c DG |
487 | error: |
488 | return ret; | |
489 | } | |
490 | ||
4a15001e MD |
491 | static int init_thread_quit_pipe(void) |
492 | { | |
493 | return __init_thread_quit_pipe(thread_quit_pipe); | |
494 | } | |
495 | ||
099e26bd DG |
496 | /* |
497 | * Stop all threads by closing the thread quit pipe. | |
498 | */ | |
cf3af59e MD |
499 | static void stop_threads(void) |
500 | { | |
5eb91c98 DG |
501 | int ret; |
502 | ||
cf3af59e MD |
503 | /* Stopping all threads */ |
504 | DBG("Terminating all threads"); | |
54d01ffb | 505 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
506 | if (ret < 0) { |
507 | ERR("write error on thread quit pipe"); | |
508 | } | |
509 | ||
099e26bd | 510 | /* Dispatch thread */ |
26c9d55e | 511 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 512 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
513 | } |
514 | ||
e975f9f8 DG |
515 | /* |
516 | * Close every consumer sockets. | |
517 | */ | |
518 | static void close_consumer_sockets(void) | |
519 | { | |
520 | int ret; | |
521 | ||
522 | if (kconsumer_data.err_sock >= 0) { | |
523 | ret = close(kconsumer_data.err_sock); | |
524 | if (ret < 0) { | |
525 | PERROR("kernel consumer err_sock close"); | |
526 | } | |
527 | } | |
528 | if (ustconsumer32_data.err_sock >= 0) { | |
529 | ret = close(ustconsumer32_data.err_sock); | |
530 | if (ret < 0) { | |
a76cbd9f | 531 | PERROR("UST consumerd32 err_sock close"); |
e975f9f8 DG |
532 | } |
533 | } | |
534 | if (ustconsumer64_data.err_sock >= 0) { | |
535 | ret = close(ustconsumer64_data.err_sock); | |
536 | if (ret < 0) { | |
a76cbd9f | 537 | PERROR("UST consumerd64 err_sock close"); |
e975f9f8 DG |
538 | } |
539 | } | |
540 | if (kconsumer_data.cmd_sock >= 0) { | |
541 | ret = close(kconsumer_data.cmd_sock); | |
542 | if (ret < 0) { | |
543 | PERROR("kernel consumer cmd_sock close"); | |
544 | } | |
545 | } | |
546 | if (ustconsumer32_data.cmd_sock >= 0) { | |
547 | ret = close(ustconsumer32_data.cmd_sock); | |
548 | if (ret < 0) { | |
a76cbd9f | 549 | PERROR("UST consumerd32 cmd_sock close"); |
e975f9f8 DG |
550 | } |
551 | } | |
552 | if (ustconsumer64_data.cmd_sock >= 0) { | |
553 | ret = close(ustconsumer64_data.cmd_sock); | |
554 | if (ret < 0) { | |
a76cbd9f | 555 | PERROR("UST consumerd64 cmd_sock close"); |
e975f9f8 DG |
556 | } |
557 | } | |
558 | } | |
559 | ||
c9cb3e7d JG |
560 | /* |
561 | * Generate the full lock file path using the rundir. | |
562 | * | |
563 | * Return the snprintf() return value thus a negative value is an error. | |
564 | */ | |
565 | static int generate_lock_file_path(char *path, size_t len) | |
566 | { | |
567 | int ret; | |
568 | ||
569 | assert(path); | |
570 | assert(rundir); | |
571 | ||
572 | /* Build lockfile path from rundir. */ | |
573 | ret = snprintf(path, len, "%s/" DEFAULT_LTTNG_SESSIOND_LOCKFILE, rundir); | |
574 | if (ret < 0) { | |
575 | PERROR("snprintf lockfile path"); | |
576 | } | |
577 | ||
578 | return ret; | |
579 | } | |
580 | ||
4e4714cb JR |
581 | /* |
582 | * Wait on consumer process termination. | |
583 | * | |
584 | * Need to be called with the consumer data lock held or from a context | |
585 | * ensuring no concurrent access to data (e.g: cleanup). | |
586 | */ | |
587 | static void wait_consumer(struct consumer_data *consumer_data) | |
588 | { | |
589 | pid_t ret; | |
590 | int status; | |
591 | ||
592 | if (consumer_data->pid <= 0) { | |
593 | return; | |
594 | } | |
595 | ||
596 | DBG("Waiting for complete teardown of consumerd (PID: %d)", | |
597 | consumer_data->pid); | |
598 | ret = waitpid(consumer_data->pid, &status, 0); | |
599 | if (ret == -1) { | |
600 | PERROR("consumerd waitpid pid: %d", consumer_data->pid) | |
78f1416a | 601 | } else if (!WIFEXITED(status)) { |
4e4714cb JR |
602 | ERR("consumerd termination with error: %d", |
603 | WEXITSTATUS(ret)); | |
604 | } | |
605 | consumer_data->pid = 0; | |
606 | } | |
607 | ||
fac6795d | 608 | /* |
4a15001e | 609 | * Cleanup the session daemon's data structures. |
fac6795d | 610 | */ |
4a15001e | 611 | static void sessiond_cleanup(void) |
fac6795d | 612 | { |
ef599319 | 613 | int ret; |
af9737e9 | 614 | struct ltt_session *sess, *stmp; |
8c6c56c2 | 615 | char path[PATH_MAX]; |
fac6795d | 616 | |
4a15001e | 617 | DBG("Cleanup sessiond"); |
e07ae692 | 618 | |
4e449f3f MD |
619 | /* |
620 | * Close the thread quit pipe. It has already done its job, | |
621 | * since we are now called. | |
622 | */ | |
2f77fc4b DG |
623 | utils_close_pipe(thread_quit_pipe); |
624 | ||
35f90c40 DG |
625 | /* |
626 | * If opt_pidfile is undefined, the default file will be wiped when | |
627 | * removing the rundir. | |
628 | */ | |
629 | if (opt_pidfile) { | |
630 | ret = remove(opt_pidfile); | |
631 | if (ret < 0) { | |
632 | PERROR("remove pidfile %s", opt_pidfile); | |
633 | } | |
634 | } | |
635 | ||
8c6c56c2 MD |
636 | DBG("Removing sessiond and consumerd content of directory %s", rundir); |
637 | ||
638 | /* sessiond */ | |
639 | snprintf(path, PATH_MAX, | |
640 | "%s/%s", | |
641 | rundir, DEFAULT_LTTNG_SESSIOND_PIDFILE); | |
642 | DBG("Removing %s", path); | |
643 | (void) unlink(path); | |
644 | ||
cd9290dd | 645 | snprintf(path, PATH_MAX, "%s/%s", rundir, |
022d91ba | 646 | DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE); |
cd9290dd DG |
647 | DBG("Removing %s", path); |
648 | (void) unlink(path); | |
649 | ||
8c6c56c2 MD |
650 | /* kconsumerd */ |
651 | snprintf(path, PATH_MAX, | |
652 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, | |
653 | rundir); | |
654 | DBG("Removing %s", path); | |
655 | (void) unlink(path); | |
656 | ||
657 | snprintf(path, PATH_MAX, | |
658 | DEFAULT_KCONSUMERD_PATH, | |
659 | rundir); | |
660 | DBG("Removing directory %s", path); | |
661 | (void) rmdir(path); | |
662 | ||
663 | /* ust consumerd 32 */ | |
664 | snprintf(path, PATH_MAX, | |
665 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, | |
666 | rundir); | |
667 | DBG("Removing %s", path); | |
668 | (void) unlink(path); | |
669 | ||
670 | snprintf(path, PATH_MAX, | |
671 | DEFAULT_USTCONSUMERD32_PATH, | |
672 | rundir); | |
673 | DBG("Removing directory %s", path); | |
674 | (void) rmdir(path); | |
675 | ||
676 | /* ust consumerd 64 */ | |
677 | snprintf(path, PATH_MAX, | |
678 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, | |
679 | rundir); | |
680 | DBG("Removing %s", path); | |
681 | (void) unlink(path); | |
682 | ||
683 | snprintf(path, PATH_MAX, | |
684 | DEFAULT_USTCONSUMERD64_PATH, | |
685 | rundir); | |
686 | DBG("Removing directory %s", path); | |
687 | (void) rmdir(path); | |
5461b305 | 688 | |
99bab54f | 689 | DBG("Cleaning up all sessions"); |
fac6795d | 690 | |
b5541356 | 691 | /* Destroy session list mutex */ |
273ea72c DG |
692 | if (session_list_ptr != NULL) { |
693 | pthread_mutex_destroy(&session_list_ptr->lock); | |
694 | ||
695 | /* Cleanup ALL session */ | |
54d01ffb DG |
696 | cds_list_for_each_entry_safe(sess, stmp, |
697 | &session_list_ptr->head, list) { | |
2f77fc4b | 698 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
699 | } |
700 | } | |
701 | ||
4e4714cb JR |
702 | wait_consumer(&kconsumer_data); |
703 | wait_consumer(&ustconsumer64_data); | |
704 | wait_consumer(&ustconsumer32_data); | |
705 | ||
6a4e4039 JG |
706 | DBG("Cleaning up all agent apps"); |
707 | agent_app_ht_clean(); | |
708 | ||
099e26bd | 709 | DBG("Closing all UST sockets"); |
56fff090 | 710 | ust_app_clean_list(); |
7972aab2 | 711 | buffer_reg_destroy_registries(); |
099e26bd | 712 | |
4fba7219 DG |
713 | if (is_root && !opt_no_kernel) { |
714 | DBG2("Closing kernel fd"); | |
a4b35e07 | 715 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
716 | ret = close(kernel_tracer_fd); |
717 | if (ret) { | |
718 | PERROR("close"); | |
719 | } | |
a4b35e07 | 720 | } |
2f50c8a3 | 721 | DBG("Unloading kernel modules"); |
096102bd | 722 | modprobe_remove_lttng_all(); |
834978fd | 723 | free(syscall_table); |
2f50c8a3 | 724 | } |
2f77fc4b | 725 | |
e975f9f8 DG |
726 | close_consumer_sockets(); |
727 | ||
ef367a93 JG |
728 | if (load_info) { |
729 | load_session_destroy_data(load_info); | |
730 | free(load_info); | |
731 | } | |
732 | ||
c9cb3e7d JG |
733 | /* |
734 | * Cleanup lock file by deleting it and finaly closing it which will | |
735 | * release the file system lock. | |
736 | */ | |
737 | if (lockfile_fd >= 0) { | |
738 | char lockfile_path[PATH_MAX]; | |
739 | ||
4a15001e MD |
740 | ret = generate_lock_file_path(lockfile_path, |
741 | sizeof(lockfile_path)); | |
c9cb3e7d JG |
742 | if (ret > 0) { |
743 | ret = remove(lockfile_path); | |
744 | if (ret < 0) { | |
745 | PERROR("remove lock file"); | |
746 | } | |
747 | ret = close(lockfile_fd); | |
748 | if (ret < 0) { | |
749 | PERROR("close lock file"); | |
750 | } | |
751 | } | |
752 | } | |
753 | ||
754 | /* | |
755 | * We do NOT rmdir rundir because there are other processes | |
756 | * using it, for instance lttng-relayd, which can start in | |
757 | * parallel with this teardown. | |
758 | */ | |
759 | ||
760 | free(rundir); | |
4a15001e MD |
761 | } |
762 | ||
763 | /* | |
764 | * Cleanup the daemon's option data structures. | |
765 | */ | |
766 | static void sessiond_cleanup_options(void) | |
767 | { | |
768 | DBG("Cleaning up options"); | |
769 | ||
770 | /* | |
771 | * If the override option is set, the pointer points to a *non* const | |
772 | * thus freeing it even though the variable type is set to const. | |
773 | */ | |
774 | if (tracing_group_name_override) { | |
775 | free((void *) tracing_group_name); | |
776 | } | |
777 | if (consumerd32_bin_override) { | |
778 | free((void *) consumerd32_bin); | |
779 | } | |
780 | if (consumerd64_bin_override) { | |
781 | free((void *) consumerd64_bin); | |
782 | } | |
783 | if (consumerd32_libdir_override) { | |
784 | free((void *) consumerd32_libdir); | |
785 | } | |
786 | if (consumerd64_libdir_override) { | |
787 | free((void *) consumerd64_libdir); | |
788 | } | |
789 | ||
790 | free(opt_pidfile); | |
791 | free(opt_load_session_path); | |
792 | free(kmod_probes_list); | |
793 | free(kmod_extra_probes_list); | |
c9cb3e7d | 794 | |
7567352f | 795 | run_as_destroy_worker(); |
fac6795d DG |
796 | } |
797 | ||
e065084a | 798 | /* |
d063d709 | 799 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 800 | * |
d063d709 | 801 | * Return lttcomm error code. |
e065084a DG |
802 | */ |
803 | static int send_unix_sock(int sock, void *buf, size_t len) | |
804 | { | |
805 | /* Check valid length */ | |
c617c0c6 | 806 | if (len == 0) { |
e065084a DG |
807 | return -1; |
808 | } | |
809 | ||
810 | return lttcomm_send_unix_sock(sock, buf, len); | |
811 | } | |
812 | ||
5461b305 | 813 | /* |
d063d709 | 814 | * Free memory of a command context structure. |
5461b305 | 815 | */ |
a2fb29a5 | 816 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 817 | { |
a2fb29a5 DG |
818 | DBG("Clean command context structure"); |
819 | if (*cmd_ctx) { | |
820 | if ((*cmd_ctx)->llm) { | |
821 | free((*cmd_ctx)->llm); | |
5461b305 | 822 | } |
a2fb29a5 DG |
823 | if ((*cmd_ctx)->lsm) { |
824 | free((*cmd_ctx)->lsm); | |
5461b305 | 825 | } |
a2fb29a5 DG |
826 | free(*cmd_ctx); |
827 | *cmd_ctx = NULL; | |
5461b305 DG |
828 | } |
829 | } | |
830 | ||
fac6795d | 831 | /* |
0fdd1e2c | 832 | * Notify UST applications using the shm mmap futex. |
fac6795d | 833 | */ |
0fdd1e2c | 834 | static int notify_ust_apps(int active) |
fac6795d | 835 | { |
0fdd1e2c | 836 | char *wait_shm_mmap; |
fac6795d | 837 | |
0fdd1e2c | 838 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 839 | |
0fdd1e2c DG |
840 | /* See shm.c for this call implying mmap, shm and futex calls */ |
841 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
842 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
843 | goto error; |
844 | } | |
845 | ||
0fdd1e2c DG |
846 | /* Wake waiting process */ |
847 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
848 | ||
849 | /* Apps notified successfully */ | |
850 | return 0; | |
fac6795d DG |
851 | |
852 | error: | |
0fdd1e2c | 853 | return -1; |
fac6795d DG |
854 | } |
855 | ||
e065084a | 856 | /* |
d063d709 DG |
857 | * Setup the outgoing data buffer for the response (llm) by allocating the |
858 | * right amount of memory and copying the original information from the lsm | |
859 | * structure. | |
ca95a216 | 860 | * |
6e10c9b9 | 861 | * Return 0 on success, negative value on error. |
ca95a216 | 862 | */ |
6e10c9b9 PP |
863 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, |
864 | const void *payload_buf, size_t payload_len, | |
865 | const void *cmd_header_buf, size_t cmd_header_len) | |
ca95a216 | 866 | { |
6e10c9b9 PP |
867 | int ret = 0; |
868 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
869 | const size_t cmd_header_offset = header_len; | |
870 | const size_t payload_offset = cmd_header_offset + cmd_header_len; | |
871 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
ca95a216 | 872 | |
6e10c9b9 | 873 | cmd_ctx->llm = zmalloc(total_msg_size); |
5461b305 | 874 | |
5461b305 | 875 | if (cmd_ctx->llm == NULL) { |
76d7553f | 876 | PERROR("zmalloc"); |
5461b305 | 877 | ret = -ENOMEM; |
6e10c9b9 | 878 | goto end; |
ca95a216 DG |
879 | } |
880 | ||
5461b305 DG |
881 | /* Copy common data */ |
882 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 883 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
6e10c9b9 PP |
884 | cmd_ctx->llm->cmd_header_size = cmd_header_len; |
885 | cmd_ctx->llm->data_size = payload_len; | |
886 | cmd_ctx->lttng_msg_size = total_msg_size; | |
5461b305 | 887 | |
6e10c9b9 | 888 | /* Copy command header */ |
b4e3ceb9 PP |
889 | if (cmd_header_len) { |
890 | memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf, | |
891 | cmd_header_len); | |
892 | } | |
5461b305 | 893 | |
6e10c9b9 | 894 | /* Copy payload */ |
b4e3ceb9 PP |
895 | if (payload_len) { |
896 | memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf, | |
897 | payload_len); | |
898 | } | |
ca95a216 | 899 | |
6e10c9b9 | 900 | end: |
ca95a216 DG |
901 | return ret; |
902 | } | |
903 | ||
6e10c9b9 PP |
904 | /* |
905 | * Version of setup_lttng_msg() without command header. | |
906 | */ | |
907 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
908 | void *payload_buf, size_t payload_len) | |
909 | { | |
910 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
911 | } | |
7a485870 | 912 | /* |
5eb91c98 | 913 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 914 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 915 | */ |
5eb91c98 | 916 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 917 | { |
5eb91c98 | 918 | int ret; |
7a485870 DG |
919 | struct ltt_session *session; |
920 | struct ltt_kernel_channel *channel; | |
921 | ||
5eb91c98 | 922 | DBG("Updating kernel poll set"); |
7a485870 | 923 | |
54d01ffb | 924 | session_lock_list(); |
b5541356 | 925 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 926 | session_lock(session); |
7a485870 | 927 | if (session->kernel_session == NULL) { |
54d01ffb | 928 | session_unlock(session); |
7a485870 DG |
929 | continue; |
930 | } | |
7a485870 | 931 | |
54d01ffb DG |
932 | cds_list_for_each_entry(channel, |
933 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
934 | /* Add channel fd to the kernel poll set */ |
935 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
936 | if (ret < 0) { | |
54d01ffb | 937 | session_unlock(session); |
5eb91c98 DG |
938 | goto error; |
939 | } | |
940 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 941 | } |
54d01ffb | 942 | session_unlock(session); |
7a485870 | 943 | } |
54d01ffb | 944 | session_unlock_list(); |
7a485870 | 945 | |
5eb91c98 | 946 | return 0; |
7a485870 DG |
947 | |
948 | error: | |
54d01ffb | 949 | session_unlock_list(); |
7a485870 DG |
950 | return -1; |
951 | } | |
952 | ||
953 | /* | |
54d01ffb | 954 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 955 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 956 | * |
d063d709 | 957 | * Useful for CPU hotplug feature. |
7a485870 | 958 | */ |
2bdd86d4 | 959 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
960 | { |
961 | int ret = 0; | |
962 | struct ltt_session *session; | |
173af62f | 963 | struct ltt_kernel_session *ksess; |
7a485870 DG |
964 | struct ltt_kernel_channel *channel; |
965 | ||
966 | DBG("Updating kernel streams for channel fd %d", fd); | |
967 | ||
54d01ffb | 968 | session_lock_list(); |
b5541356 | 969 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 970 | session_lock(session); |
7a485870 | 971 | if (session->kernel_session == NULL) { |
54d01ffb | 972 | session_unlock(session); |
7a485870 DG |
973 | continue; |
974 | } | |
173af62f | 975 | ksess = session->kernel_session; |
d9800920 | 976 | |
4a15001e MD |
977 | cds_list_for_each_entry(channel, |
978 | &ksess->channel_list.head, list) { | |
979 | struct lttng_ht_iter iter; | |
980 | struct consumer_socket *socket; | |
d9800920 | 981 | |
4a15001e MD |
982 | if (channel->fd != fd) { |
983 | continue; | |
984 | } | |
985 | DBG("Channel found, updating kernel streams"); | |
986 | ret = kernel_open_channel_stream(channel); | |
987 | if (ret < 0) { | |
988 | goto error; | |
989 | } | |
990 | /* Update the stream global counter */ | |
991 | ksess->stream_count_global += ret; | |
992 | ||
993 | /* | |
994 | * Have we already sent fds to the consumer? If yes, it | |
995 | * means that tracing is started so it is safe to send | |
996 | * our updated stream fds. | |
997 | */ | |
998 | if (ksess->consumer_fds_sent != 1 | |
999 | || ksess->consumer == NULL) { | |
1000 | ret = -1; | |
1001 | goto error; | |
1002 | } | |
1003 | ||
1004 | rcu_read_lock(); | |
1005 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, | |
1006 | &iter.iter, socket, node.node) { | |
1007 | pthread_mutex_lock(socket->lock); | |
1008 | ret = kernel_consumer_send_channel_stream(socket, | |
1009 | channel, ksess, | |
1010 | session->output_traces ? 1 : 0); | |
1011 | pthread_mutex_unlock(socket->lock); | |
1012 | if (ret < 0) { | |
e7fe706f | 1013 | rcu_read_unlock(); |
4a15001e | 1014 | goto error; |
7a485870 | 1015 | } |
7a485870 | 1016 | } |
4a15001e | 1017 | rcu_read_unlock(); |
7a485870 | 1018 | } |
54d01ffb | 1019 | session_unlock(session); |
7a485870 | 1020 | } |
54d01ffb | 1021 | session_unlock_list(); |
b3c750d2 | 1022 | return ret; |
7a485870 | 1023 | |
b3c750d2 | 1024 | error: |
54d01ffb DG |
1025 | session_unlock(session); |
1026 | session_unlock_list(); | |
7a485870 DG |
1027 | return ret; |
1028 | } | |
1029 | ||
487cf67c | 1030 | /* |
ffe60014 DG |
1031 | * For each tracing session, update newly registered apps. The session list |
1032 | * lock MUST be acquired before calling this. | |
487cf67c DG |
1033 | */ |
1034 | static void update_ust_app(int app_sock) | |
1035 | { | |
1036 | struct ltt_session *sess, *stmp; | |
1037 | ||
fdadac08 DG |
1038 | /* Consumer is in an ERROR state. Stop any application update. */ |
1039 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
1040 | /* Stop the update process since the consumer is dead. */ | |
1041 | return; | |
1042 | } | |
1043 | ||
487cf67c DG |
1044 | /* For all tracing session(s) */ |
1045 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
a9ad0c8f MD |
1046 | struct ust_app *app; |
1047 | ||
4ee14516 | 1048 | session_lock(sess); |
a9ad0c8f MD |
1049 | if (!sess->ust_session) { |
1050 | goto unlock_session; | |
1051 | } | |
1052 | ||
1053 | rcu_read_lock(); | |
1054 | assert(app_sock >= 0); | |
1055 | app = ust_app_find_by_sock(app_sock); | |
1056 | if (app == NULL) { | |
1057 | /* | |
1058 | * Application can be unregistered before so | |
1059 | * this is possible hence simply stopping the | |
1060 | * update. | |
1061 | */ | |
1062 | DBG3("UST app update failed to find app sock %d", | |
1063 | app_sock); | |
1064 | goto unlock_rcu; | |
421cb601 | 1065 | } |
a9ad0c8f MD |
1066 | ust_app_global_update(sess->ust_session, app); |
1067 | unlock_rcu: | |
1068 | rcu_read_unlock(); | |
1069 | unlock_session: | |
4ee14516 | 1070 | session_unlock(sess); |
487cf67c DG |
1071 | } |
1072 | } | |
1073 | ||
7a485870 | 1074 | /* |
d063d709 | 1075 | * This thread manage event coming from the kernel. |
7a485870 | 1076 | * |
d063d709 DG |
1077 | * Features supported in this thread: |
1078 | * -) CPU Hotplug | |
7a485870 DG |
1079 | */ |
1080 | static void *thread_manage_kernel(void *data) | |
1081 | { | |
139ac872 | 1082 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 1083 | uint32_t revents, nb_fd; |
7a485870 | 1084 | char tmp; |
5eb91c98 | 1085 | struct lttng_poll_event events; |
7a485870 | 1086 | |
6993eeb3 | 1087 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 1088 | |
6c71277b | 1089 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL); |
927ca06a | 1090 | |
d5d63bf1 DG |
1091 | /* |
1092 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 1093 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 1094 | */ |
6d737ce4 | 1095 | lttng_poll_init(&events); |
d5d63bf1 | 1096 | |
e547b070 | 1097 | if (testpoint(sessiond_thread_manage_kernel)) { |
6993eeb3 CB |
1098 | goto error_testpoint; |
1099 | } | |
8ac94142 | 1100 | |
840cb59c | 1101 | health_code_update(); |
44a5e5eb | 1102 | |
e547b070 | 1103 | if (testpoint(sessiond_thread_manage_kernel_before_loop)) { |
d21b0d71 | 1104 | goto error_testpoint; |
6993eeb3 CB |
1105 | } |
1106 | ||
7a485870 | 1107 | while (1) { |
840cb59c | 1108 | health_code_update(); |
44a5e5eb | 1109 | |
7a485870 | 1110 | if (update_poll_flag == 1) { |
d21b0d71 DG |
1111 | /* Clean events object. We are about to populate it again. */ |
1112 | lttng_poll_clean(&events); | |
1113 | ||
d0b96690 | 1114 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
1115 | if (ret < 0) { |
1116 | goto error_poll_create; | |
1117 | } | |
1118 | ||
1119 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
1120 | if (ret < 0) { | |
1121 | goto error; | |
1122 | } | |
5f822d0a | 1123 | |
d21b0d71 | 1124 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
1125 | ret = update_kernel_poll(&events); |
1126 | if (ret < 0) { | |
7a485870 DG |
1127 | goto error; |
1128 | } | |
1129 | update_poll_flag = 0; | |
1130 | } | |
1131 | ||
7fa2082e | 1132 | DBG("Thread kernel polling"); |
7a485870 DG |
1133 | |
1134 | /* Poll infinite value of time */ | |
88f2b785 | 1135 | restart: |
a78af745 | 1136 | health_poll_entry(); |
5eb91c98 | 1137 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
1138 | DBG("Thread kernel return from poll on %d fds", |
1139 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 1140 | health_poll_exit(); |
7a485870 | 1141 | if (ret < 0) { |
88f2b785 MD |
1142 | /* |
1143 | * Restart interrupted system call. | |
1144 | */ | |
1145 | if (errno == EINTR) { | |
1146 | goto restart; | |
1147 | } | |
7a485870 DG |
1148 | goto error; |
1149 | } else if (ret == 0) { | |
1150 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
1151 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
1152 | "This should not have happened! Continuing..."); | |
7a485870 DG |
1153 | continue; |
1154 | } | |
1155 | ||
0d9c5d77 DG |
1156 | nb_fd = ret; |
1157 | ||
5eb91c98 DG |
1158 | for (i = 0; i < nb_fd; i++) { |
1159 | /* Fetch once the poll data */ | |
1160 | revents = LTTNG_POLL_GETEV(&events, i); | |
1161 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 1162 | |
840cb59c | 1163 | health_code_update(); |
44a5e5eb | 1164 | |
fd20dac9 MD |
1165 | if (!revents) { |
1166 | /* No activity for this FD (poll implementation). */ | |
1167 | continue; | |
1168 | } | |
1169 | ||
5eb91c98 | 1170 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1171 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1172 | if (ret) { |
139ac872 MD |
1173 | err = 0; |
1174 | goto exit; | |
5eb91c98 | 1175 | } |
7a485870 | 1176 | |
5eb91c98 | 1177 | /* Check for data on kernel pipe */ |
03e43155 MD |
1178 | if (revents & LPOLLIN) { |
1179 | if (pollfd == kernel_poll_pipe[0]) { | |
1180 | (void) lttng_read(kernel_poll_pipe[0], | |
1181 | &tmp, 1); | |
1182 | /* | |
1183 | * Ret value is useless here, if this pipe gets any actions an | |
1184 | * update is required anyway. | |
1185 | */ | |
1186 | update_poll_flag = 1; | |
1187 | continue; | |
1188 | } else { | |
1189 | /* | |
1190 | * New CPU detected by the kernel. Adding kernel stream to | |
1191 | * kernel session and updating the kernel consumer | |
1192 | */ | |
2bdd86d4 | 1193 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
1194 | if (ret < 0) { |
1195 | continue; | |
1196 | } | |
1197 | break; | |
7a485870 | 1198 | } |
03e43155 MD |
1199 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1200 | update_poll_flag = 1; | |
1201 | continue; | |
1202 | } else { | |
1203 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1204 | goto error; | |
7a485870 DG |
1205 | } |
1206 | } | |
1207 | } | |
1208 | ||
139ac872 | 1209 | exit: |
7a485870 | 1210 | error: |
5eb91c98 | 1211 | lttng_poll_clean(&events); |
76d7553f | 1212 | error_poll_create: |
6993eeb3 | 1213 | error_testpoint: |
6620da75 DG |
1214 | utils_close_pipe(kernel_poll_pipe); |
1215 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 1216 | if (err) { |
840cb59c | 1217 | health_error(); |
139ac872 | 1218 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
1219 | WARN("Kernel thread died unexpectedly. " |
1220 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 1221 | } |
8782cc74 | 1222 | health_unregister(health_sessiond); |
76d7553f | 1223 | DBG("Kernel thread dying"); |
7a485870 DG |
1224 | return NULL; |
1225 | } | |
1226 | ||
a23ec3a7 DG |
1227 | /* |
1228 | * Signal pthread condition of the consumer data that the thread. | |
1229 | */ | |
1230 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
1231 | { | |
1232 | pthread_mutex_lock(&data->cond_mutex); | |
1233 | ||
1234 | /* | |
1235 | * The state is set before signaling. It can be any value, it's the waiter | |
1236 | * job to correctly interpret this condition variable associated to the | |
1237 | * consumer pthread_cond. | |
1238 | * | |
1239 | * A value of 0 means that the corresponding thread of the consumer data | |
1240 | * was not started. 1 indicates that the thread has started and is ready | |
1241 | * for action. A negative value means that there was an error during the | |
1242 | * thread bootstrap. | |
1243 | */ | |
1244 | data->consumer_thread_is_ready = state; | |
1245 | (void) pthread_cond_signal(&data->cond); | |
1246 | ||
1247 | pthread_mutex_unlock(&data->cond_mutex); | |
1248 | } | |
1249 | ||
1d4b027a | 1250 | /* |
3bd1e081 | 1251 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 1252 | */ |
3bd1e081 | 1253 | static void *thread_manage_consumer(void *data) |
1d4b027a | 1254 | { |
42fc1d0b | 1255 | int sock = -1, i, ret, pollfd, err = -1, should_quit = 0; |
5eb91c98 | 1256 | uint32_t revents, nb_fd; |
1d4b027a | 1257 | enum lttcomm_return_code code; |
5eb91c98 | 1258 | struct lttng_poll_event events; |
3bd1e081 | 1259 | struct consumer_data *consumer_data = data; |
1d4b027a | 1260 | |
3bd1e081 | 1261 | DBG("[thread] Manage consumer started"); |
1d4b027a | 1262 | |
34c1e15a MD |
1263 | rcu_register_thread(); |
1264 | rcu_thread_online(); | |
1265 | ||
6c71277b | 1266 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER); |
927ca06a | 1267 | |
855060f8 | 1268 | health_code_update(); |
9449cc75 | 1269 | |
5eb91c98 | 1270 | /* |
331744e3 JD |
1271 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
1272 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 1273 | */ |
331744e3 | 1274 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 1275 | if (ret < 0) { |
76d7553f | 1276 | goto error_poll; |
5eb91c98 | 1277 | } |
273ea72c | 1278 | |
edb8b045 DG |
1279 | /* |
1280 | * The error socket here is already in a listening state which was done | |
1281 | * just before spawning this thread to avoid a race between the consumer | |
1282 | * daemon exec trying to connect and the listen() call. | |
1283 | */ | |
3bd1e081 | 1284 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
1285 | if (ret < 0) { |
1286 | goto error; | |
1287 | } | |
1288 | ||
840cb59c | 1289 | health_code_update(); |
44a5e5eb | 1290 | |
331744e3 | 1291 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1292 | restart: |
a78af745 | 1293 | health_poll_entry(); |
8ac94142 | 1294 | |
e547b070 | 1295 | if (testpoint(sessiond_thread_manage_consumer)) { |
6993eeb3 CB |
1296 | goto error; |
1297 | } | |
8ac94142 | 1298 | |
5eb91c98 | 1299 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1300 | health_poll_exit(); |
273ea72c | 1301 | if (ret < 0) { |
88f2b785 MD |
1302 | /* |
1303 | * Restart interrupted system call. | |
1304 | */ | |
1305 | if (errno == EINTR) { | |
1306 | goto restart; | |
1307 | } | |
273ea72c DG |
1308 | goto error; |
1309 | } | |
1310 | ||
0d9c5d77 DG |
1311 | nb_fd = ret; |
1312 | ||
5eb91c98 DG |
1313 | for (i = 0; i < nb_fd; i++) { |
1314 | /* Fetch once the poll data */ | |
1315 | revents = LTTNG_POLL_GETEV(&events, i); | |
1316 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1317 | ||
840cb59c | 1318 | health_code_update(); |
44a5e5eb | 1319 | |
fd20dac9 MD |
1320 | if (!revents) { |
1321 | /* No activity for this FD (poll implementation). */ | |
1322 | continue; | |
1323 | } | |
1324 | ||
5eb91c98 | 1325 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1326 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1327 | if (ret) { |
139ac872 MD |
1328 | err = 0; |
1329 | goto exit; | |
5eb91c98 DG |
1330 | } |
1331 | ||
1332 | /* Event on the registration socket */ | |
3bd1e081 | 1333 | if (pollfd == consumer_data->err_sock) { |
03e43155 MD |
1334 | if (revents & LPOLLIN) { |
1335 | continue; | |
1336 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1337 | ERR("consumer err socket poll error"); |
5eb91c98 | 1338 | goto error; |
03e43155 MD |
1339 | } else { |
1340 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1341 | goto error; | |
5eb91c98 DG |
1342 | } |
1343 | } | |
273ea72c DG |
1344 | } |
1345 | ||
3bd1e081 | 1346 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1347 | if (sock < 0) { |
1348 | goto error; | |
1349 | } | |
1350 | ||
b662582b DG |
1351 | /* |
1352 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
1353 | * show must go on. | |
1354 | */ | |
1355 | (void) utils_set_fd_cloexec(sock); | |
1356 | ||
840cb59c | 1357 | health_code_update(); |
44a5e5eb | 1358 | |
3bd1e081 | 1359 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1360 | |
712ea556 | 1361 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1362 | ret = lttcomm_recv_unix_sock(sock, &code, |
1363 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1364 | if (ret <= 0) { |
1365 | goto error; | |
1366 | } | |
1367 | ||
840cb59c | 1368 | health_code_update(); |
f73fabfd | 1369 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
331744e3 | 1370 | /* Connect both socket, command and metadata. */ |
3bd1e081 MD |
1371 | consumer_data->cmd_sock = |
1372 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
4ce514c4 | 1373 | consumer_data->metadata_fd = |
331744e3 | 1374 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); |
92db7cdc DG |
1375 | if (consumer_data->cmd_sock < 0 |
1376 | || consumer_data->metadata_fd < 0) { | |
331744e3 | 1377 | PERROR("consumer connect cmd socket"); |
a23ec3a7 DG |
1378 | /* On error, signal condition and quit. */ |
1379 | signal_consumer_condition(consumer_data, -1); | |
1d4b027a DG |
1380 | goto error; |
1381 | } | |
9363801e | 1382 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; |
331744e3 JD |
1383 | /* Create metadata socket lock. */ |
1384 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1385 | if (consumer_data->metadata_sock.lock == NULL) { | |
1386 | PERROR("zmalloc pthread mutex"); | |
331744e3 JD |
1387 | goto error; |
1388 | } | |
1389 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1390 | ||
a23ec3a7 | 1391 | signal_consumer_condition(consumer_data, 1); |
331744e3 JD |
1392 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); |
1393 | DBG("Consumer metadata socket ready (fd: %d)", | |
4ce514c4 | 1394 | consumer_data->metadata_fd); |
1d4b027a | 1395 | } else { |
3bd1e081 | 1396 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1397 | lttcomm_get_readable_code(-code)); |
1398 | goto error; | |
1399 | } | |
1400 | ||
331744e3 | 1401 | /* Remove the consumerd error sock since we've established a connexion */ |
3bd1e081 | 1402 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1403 | if (ret < 0) { |
72079cae DG |
1404 | goto error; |
1405 | } | |
1406 | ||
331744e3 | 1407 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1408 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1409 | if (ret < 0) { | |
72079cae | 1410 | goto error; |
5eb91c98 DG |
1411 | } |
1412 | ||
331744e3 | 1413 | /* Add metadata socket that is successfully connected. */ |
4ce514c4 | 1414 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, |
331744e3 JD |
1415 | LPOLLIN | LPOLLRDHUP); |
1416 | if (ret < 0) { | |
1417 | goto error; | |
1418 | } | |
1419 | ||
840cb59c | 1420 | health_code_update(); |
44a5e5eb | 1421 | |
331744e3 | 1422 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1423 | restart_poll: |
331744e3 | 1424 | while (1) { |
42fc1d0b DG |
1425 | health_code_update(); |
1426 | ||
1427 | /* Exit the thread because the thread quit pipe has been triggered. */ | |
1428 | if (should_quit) { | |
1429 | /* Not a health error. */ | |
1430 | err = 0; | |
1431 | goto exit; | |
1432 | } | |
1433 | ||
331744e3 JD |
1434 | health_poll_entry(); |
1435 | ret = lttng_poll_wait(&events, -1); | |
1436 | health_poll_exit(); | |
1437 | if (ret < 0) { | |
1438 | /* | |
1439 | * Restart interrupted system call. | |
1440 | */ | |
1441 | if (errno == EINTR) { | |
1442 | goto restart_poll; | |
1443 | } | |
1444 | goto error; | |
88f2b785 | 1445 | } |
72079cae | 1446 | |
331744e3 | 1447 | nb_fd = ret; |
0d9c5d77 | 1448 | |
331744e3 JD |
1449 | for (i = 0; i < nb_fd; i++) { |
1450 | /* Fetch once the poll data */ | |
1451 | revents = LTTNG_POLL_GETEV(&events, i); | |
1452 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1453 | |
331744e3 | 1454 | health_code_update(); |
44a5e5eb | 1455 | |
fd20dac9 MD |
1456 | if (!revents) { |
1457 | /* No activity for this FD (poll implementation). */ | |
1458 | continue; | |
1459 | } | |
1460 | ||
42fc1d0b DG |
1461 | /* |
1462 | * Thread quit pipe has been triggered, flag that we should stop | |
1463 | * but continue the current loop to handle potential data from | |
1464 | * consumer. | |
1465 | */ | |
1466 | should_quit = sessiond_check_thread_quit_pipe(pollfd, revents); | |
5eb91c98 | 1467 | |
331744e3 JD |
1468 | if (pollfd == sock) { |
1469 | /* Event on the consumerd socket */ | |
03e43155 MD |
1470 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
1471 | && !(revents & LPOLLIN)) { | |
331744e3 JD |
1472 | ERR("consumer err socket second poll error"); |
1473 | goto error; | |
1474 | } | |
1475 | health_code_update(); | |
1476 | /* Wait for any kconsumerd error */ | |
1477 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1478 | sizeof(enum lttcomm_return_code)); | |
1479 | if (ret <= 0) { | |
1480 | ERR("consumer closed the command socket"); | |
1481 | goto error; | |
1482 | } | |
1483 | ||
1484 | ERR("consumer return code : %s", | |
1485 | lttcomm_get_readable_code(-code)); | |
1486 | ||
1487 | goto exit; | |
4ce514c4 | 1488 | } else if (pollfd == consumer_data->metadata_fd) { |
03e43155 MD |
1489 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
1490 | && !(revents & LPOLLIN)) { | |
1491 | ERR("consumer err metadata socket second poll error"); | |
1492 | goto error; | |
1493 | } | |
331744e3 JD |
1494 | /* UST metadata requests */ |
1495 | ret = ust_consumer_metadata_request( | |
1496 | &consumer_data->metadata_sock); | |
1497 | if (ret < 0) { | |
1498 | ERR("Handling metadata request"); | |
1499 | goto error; | |
1500 | } | |
5eb91c98 | 1501 | } |
42fc1d0b | 1502 | /* No need for an else branch all FDs are tested prior. */ |
5eb91c98 | 1503 | } |
331744e3 | 1504 | health_code_update(); |
5eb91c98 DG |
1505 | } |
1506 | ||
139ac872 | 1507 | exit: |
1d4b027a | 1508 | error: |
fdadac08 DG |
1509 | /* |
1510 | * We lock here because we are about to close the sockets and some other | |
92db7cdc DG |
1511 | * thread might be using them so get exclusive access which will abort all |
1512 | * other consumer command by other threads. | |
fdadac08 DG |
1513 | */ |
1514 | pthread_mutex_lock(&consumer_data->lock); | |
1515 | ||
5c827ce0 DG |
1516 | /* Immediately set the consumerd state to stopped */ |
1517 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1518 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1519 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1520 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1521 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1522 | } else { | |
1523 | /* Code flow error... */ | |
1524 | assert(0); | |
1525 | } | |
1526 | ||
76d7553f MD |
1527 | if (consumer_data->err_sock >= 0) { |
1528 | ret = close(consumer_data->err_sock); | |
1529 | if (ret) { | |
1530 | PERROR("close"); | |
1531 | } | |
a76cbd9f | 1532 | consumer_data->err_sock = -1; |
76d7553f MD |
1533 | } |
1534 | if (consumer_data->cmd_sock >= 0) { | |
1535 | ret = close(consumer_data->cmd_sock); | |
1536 | if (ret) { | |
1537 | PERROR("close"); | |
1538 | } | |
a76cbd9f | 1539 | consumer_data->cmd_sock = -1; |
76d7553f | 1540 | } |
96544455 SS |
1541 | if (consumer_data->metadata_sock.fd_ptr && |
1542 | *consumer_data->metadata_sock.fd_ptr >= 0) { | |
9363801e | 1543 | ret = close(*consumer_data->metadata_sock.fd_ptr); |
331744e3 JD |
1544 | if (ret) { |
1545 | PERROR("close"); | |
1546 | } | |
1547 | } | |
76d7553f MD |
1548 | if (sock >= 0) { |
1549 | ret = close(sock); | |
1550 | if (ret) { | |
1551 | PERROR("close"); | |
1552 | } | |
1553 | } | |
273ea72c | 1554 | |
3bd1e081 MD |
1555 | unlink(consumer_data->err_unix_sock_path); |
1556 | unlink(consumer_data->cmd_unix_sock_path); | |
fdadac08 | 1557 | pthread_mutex_unlock(&consumer_data->lock); |
92db7cdc | 1558 | |
fdadac08 | 1559 | /* Cleanup metadata socket mutex. */ |
96544455 SS |
1560 | if (consumer_data->metadata_sock.lock) { |
1561 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1562 | free(consumer_data->metadata_sock.lock); | |
1563 | } | |
5eb91c98 | 1564 | lttng_poll_clean(&events); |
76d7553f | 1565 | error_poll: |
139ac872 | 1566 | if (err) { |
840cb59c | 1567 | health_error(); |
139ac872 MD |
1568 | ERR("Health error occurred in %s", __func__); |
1569 | } | |
8782cc74 | 1570 | health_unregister(health_sessiond); |
76d7553f | 1571 | DBG("consumer thread cleanup completed"); |
0177d773 | 1572 | |
34c1e15a MD |
1573 | rcu_thread_offline(); |
1574 | rcu_unregister_thread(); | |
1575 | ||
5eb91c98 | 1576 | return NULL; |
099e26bd DG |
1577 | } |
1578 | ||
099e26bd DG |
1579 | /* |
1580 | * This thread manage application communication. | |
1d4b027a DG |
1581 | */ |
1582 | static void *thread_manage_apps(void *data) | |
099e26bd | 1583 | { |
139ac872 | 1584 | int i, ret, pollfd, err = -1; |
6cd525e8 | 1585 | ssize_t size_ret; |
5eb91c98 | 1586 | uint32_t revents, nb_fd; |
5eb91c98 | 1587 | struct lttng_poll_event events; |
099e26bd DG |
1588 | |
1589 | DBG("[thread] Manage application started"); | |
1590 | ||
f6a9efaa DG |
1591 | rcu_register_thread(); |
1592 | rcu_thread_online(); | |
1593 | ||
6c71277b | 1594 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE); |
927ca06a | 1595 | |
e547b070 | 1596 | if (testpoint(sessiond_thread_manage_apps)) { |
6993eeb3 CB |
1597 | goto error_testpoint; |
1598 | } | |
1599 | ||
840cb59c | 1600 | health_code_update(); |
44a5e5eb | 1601 | |
d0b96690 | 1602 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1603 | if (ret < 0) { |
76d7553f | 1604 | goto error_poll_create; |
5eb91c98 | 1605 | } |
099e26bd | 1606 | |
5eb91c98 DG |
1607 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1608 | if (ret < 0) { | |
1609 | goto error; | |
1610 | } | |
099e26bd | 1611 | |
e547b070 | 1612 | if (testpoint(sessiond_thread_manage_apps_before_loop)) { |
6993eeb3 CB |
1613 | goto error; |
1614 | } | |
8ac94142 | 1615 | |
840cb59c | 1616 | health_code_update(); |
44a5e5eb | 1617 | |
5eb91c98 | 1618 | while (1) { |
7fa2082e | 1619 | DBG("Apps thread polling"); |
099e26bd DG |
1620 | |
1621 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1622 | restart: |
a78af745 | 1623 | health_poll_entry(); |
5eb91c98 | 1624 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
1625 | DBG("Apps thread return from poll on %d fds", |
1626 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 1627 | health_poll_exit(); |
099e26bd | 1628 | if (ret < 0) { |
88f2b785 MD |
1629 | /* |
1630 | * Restart interrupted system call. | |
1631 | */ | |
1632 | if (errno == EINTR) { | |
1633 | goto restart; | |
1634 | } | |
099e26bd DG |
1635 | goto error; |
1636 | } | |
1637 | ||
0d9c5d77 DG |
1638 | nb_fd = ret; |
1639 | ||
5eb91c98 DG |
1640 | for (i = 0; i < nb_fd; i++) { |
1641 | /* Fetch once the poll data */ | |
1642 | revents = LTTNG_POLL_GETEV(&events, i); | |
1643 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1644 | ||
840cb59c | 1645 | health_code_update(); |
44a5e5eb | 1646 | |
fd20dac9 MD |
1647 | if (!revents) { |
1648 | /* No activity for this FD (poll implementation). */ | |
1649 | continue; | |
1650 | } | |
1651 | ||
5eb91c98 | 1652 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1653 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1654 | if (ret) { |
139ac872 MD |
1655 | err = 0; |
1656 | goto exit; | |
5eb91c98 | 1657 | } |
099e26bd | 1658 | |
5eb91c98 DG |
1659 | /* Inspect the apps cmd pipe */ |
1660 | if (pollfd == apps_cmd_pipe[0]) { | |
03e43155 | 1661 | if (revents & LPOLLIN) { |
d0b96690 DG |
1662 | int sock; |
1663 | ||
5eb91c98 | 1664 | /* Empty pipe */ |
6cd525e8 MD |
1665 | size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
1666 | if (size_ret < sizeof(sock)) { | |
76d7553f | 1667 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1668 | goto error; |
1669 | } | |
099e26bd | 1670 | |
840cb59c | 1671 | health_code_update(); |
44a5e5eb | 1672 | |
ffe60014 | 1673 | /* |
03e43155 MD |
1674 | * Since this is a command socket (write then read), |
1675 | * we only monitor the error events of the socket. | |
ffe60014 | 1676 | */ |
d0b96690 DG |
1677 | ret = lttng_poll_add(&events, sock, |
1678 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1679 | if (ret < 0) { | |
5eb91c98 | 1680 | goto error; |
e0c7ec2b | 1681 | } |
acc7b41b | 1682 | |
d0b96690 | 1683 | DBG("Apps with sock %d added to poll set", sock); |
03e43155 MD |
1684 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1685 | ERR("Apps command pipe error"); | |
1686 | goto error; | |
1687 | } else { | |
1688 | ERR("Unknown poll events %u for sock %d", revents, pollfd); | |
1689 | goto error; | |
0177d773 | 1690 | } |
5eb91c98 DG |
1691 | } else { |
1692 | /* | |
54d01ffb DG |
1693 | * At this point, we know that a registered application made |
1694 | * the event at poll_wait. | |
5eb91c98 DG |
1695 | */ |
1696 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1697 | /* Removing from the poll set */ | |
1698 | ret = lttng_poll_del(&events, pollfd); | |
1699 | if (ret < 0) { | |
1700 | goto error; | |
1701 | } | |
099e26bd | 1702 | |
b9d9b220 | 1703 | /* Socket closed on remote end. */ |
56fff090 | 1704 | ust_app_unregister(pollfd); |
03e43155 MD |
1705 | } else { |
1706 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1707 | goto error; | |
5eb91c98 | 1708 | } |
099e26bd | 1709 | } |
44a5e5eb | 1710 | |
840cb59c | 1711 | health_code_update(); |
099e26bd | 1712 | } |
099e26bd DG |
1713 | } |
1714 | ||
139ac872 | 1715 | exit: |
099e26bd | 1716 | error: |
5eb91c98 | 1717 | lttng_poll_clean(&events); |
76d7553f | 1718 | error_poll_create: |
6993eeb3 | 1719 | error_testpoint: |
6620da75 DG |
1720 | utils_close_pipe(apps_cmd_pipe); |
1721 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1722 | ||
1723 | /* | |
1724 | * We don't clean the UST app hash table here since already registered | |
1725 | * applications can still be controlled so let them be until the session | |
1726 | * daemon dies or the applications stop. | |
1727 | */ | |
1728 | ||
139ac872 | 1729 | if (err) { |
840cb59c | 1730 | health_error(); |
139ac872 MD |
1731 | ERR("Health error occurred in %s", __func__); |
1732 | } | |
8782cc74 | 1733 | health_unregister(health_sessiond); |
76d7553f | 1734 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1735 | rcu_thread_offline(); |
1736 | rcu_unregister_thread(); | |
099e26bd DG |
1737 | return NULL; |
1738 | } | |
1739 | ||
d0b96690 | 1740 | /* |
d88aee68 DG |
1741 | * Send a socket to a thread This is called from the dispatch UST registration |
1742 | * thread once all sockets are set for the application. | |
d0b96690 | 1743 | * |
b85dc84c DG |
1744 | * The sock value can be invalid, we don't really care, the thread will handle |
1745 | * it and make the necessary cleanup if so. | |
1746 | * | |
d0b96690 DG |
1747 | * On success, return 0 else a negative value being the errno message of the |
1748 | * write(). | |
1749 | */ | |
d88aee68 | 1750 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 | 1751 | { |
6cd525e8 | 1752 | ssize_t ret; |
d0b96690 | 1753 | |
b85dc84c DG |
1754 | /* |
1755 | * It's possible that the FD is set as invalid with -1 concurrently just | |
1756 | * before calling this function being a shutdown state of the thread. | |
1757 | */ | |
1758 | if (fd < 0) { | |
1759 | ret = -EBADF; | |
1760 | goto error; | |
1761 | } | |
d0b96690 | 1762 | |
6cd525e8 MD |
1763 | ret = lttng_write(fd, &sock, sizeof(sock)); |
1764 | if (ret < sizeof(sock)) { | |
d88aee68 | 1765 | PERROR("write apps pipe %d", fd); |
d0b96690 DG |
1766 | if (ret < 0) { |
1767 | ret = -errno; | |
1768 | } | |
1769 | goto error; | |
1770 | } | |
1771 | ||
1772 | /* All good. Don't send back the write positive ret value. */ | |
1773 | ret = 0; | |
1774 | error: | |
6cd525e8 | 1775 | return (int) ret; |
d0b96690 DG |
1776 | } |
1777 | ||
f45e313d DG |
1778 | /* |
1779 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1780 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1781 | * notify socket is never received. | |
1782 | */ | |
1783 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1784 | { | |
1785 | int ret, nb_fd = 0, i; | |
1786 | unsigned int fd_added = 0; | |
1787 | struct lttng_poll_event events; | |
1788 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1789 | ||
1790 | assert(wait_queue); | |
1791 | ||
1792 | lttng_poll_init(&events); | |
1793 | ||
1794 | /* Just skip everything for an empty queue. */ | |
1795 | if (!wait_queue->count) { | |
1796 | goto end; | |
1797 | } | |
1798 | ||
1799 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1800 | if (ret < 0) { | |
1801 | goto error_create; | |
1802 | } | |
1803 | ||
1804 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1805 | &wait_queue->head, head) { | |
1806 | assert(wait_node->app); | |
1807 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1808 | LPOLLHUP | LPOLLERR); | |
1809 | if (ret < 0) { | |
1810 | goto error; | |
1811 | } | |
1812 | ||
1813 | fd_added = 1; | |
1814 | } | |
1815 | ||
1816 | if (!fd_added) { | |
1817 | goto end; | |
1818 | } | |
1819 | ||
1820 | /* | |
1821 | * Poll but don't block so we can quickly identify the faulty events and | |
1822 | * clean them afterwards from the wait queue. | |
1823 | */ | |
1824 | ret = lttng_poll_wait(&events, 0); | |
1825 | if (ret < 0) { | |
1826 | goto error; | |
1827 | } | |
1828 | nb_fd = ret; | |
1829 | ||
1830 | for (i = 0; i < nb_fd; i++) { | |
1831 | /* Get faulty FD. */ | |
1832 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1833 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1834 | ||
fd20dac9 MD |
1835 | if (!revents) { |
1836 | /* No activity for this FD (poll implementation). */ | |
1837 | continue; | |
1838 | } | |
1839 | ||
f45e313d DG |
1840 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
1841 | &wait_queue->head, head) { | |
1842 | if (pollfd == wait_node->app->sock && | |
1843 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1844 | cds_list_del(&wait_node->head); | |
1845 | wait_queue->count--; | |
1846 | ust_app_destroy(wait_node->app); | |
1847 | free(wait_node); | |
48b40bcf JG |
1848 | /* |
1849 | * Silence warning of use-after-free in | |
1850 | * cds_list_for_each_entry_safe which uses | |
1851 | * __typeof__(*wait_node). | |
1852 | */ | |
1853 | wait_node = NULL; | |
f45e313d | 1854 | break; |
03e43155 MD |
1855 | } else { |
1856 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1857 | goto error; | |
f45e313d DG |
1858 | } |
1859 | } | |
1860 | } | |
1861 | ||
1862 | if (nb_fd > 0) { | |
1863 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1864 | } | |
1865 | ||
1866 | end: | |
1867 | lttng_poll_clean(&events); | |
1868 | return; | |
1869 | ||
1870 | error: | |
1871 | lttng_poll_clean(&events); | |
1872 | error_create: | |
1873 | ERR("Unable to sanitize wait queue"); | |
1874 | return; | |
1875 | } | |
1876 | ||
099e26bd DG |
1877 | /* |
1878 | * Dispatch request from the registration threads to the application | |
1879 | * communication thread. | |
1880 | */ | |
1881 | static void *thread_dispatch_ust_registration(void *data) | |
1882 | { | |
12e2b881 | 1883 | int ret, err = -1; |
8bdee6e2 | 1884 | struct cds_wfcq_node *node; |
099e26bd | 1885 | struct ust_command *ust_cmd = NULL; |
f45e313d DG |
1886 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1887 | struct ust_reg_wait_queue wait_queue = { | |
1888 | .count = 0, | |
1889 | }; | |
d0b96690 | 1890 | |
78d8cf23 MD |
1891 | rcu_register_thread(); |
1892 | ||
6c71277b | 1893 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH); |
12e2b881 | 1894 | |
9ad42ec1 MD |
1895 | if (testpoint(sessiond_thread_app_reg_dispatch)) { |
1896 | goto error_testpoint; | |
1897 | } | |
1898 | ||
12e2b881 MD |
1899 | health_code_update(); |
1900 | ||
f45e313d | 1901 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1902 | |
1903 | DBG("[thread] Dispatch UST command started"); | |
1904 | ||
68924dc1 | 1905 | for (;;) { |
12e2b881 MD |
1906 | health_code_update(); |
1907 | ||
099e26bd DG |
1908 | /* Atomically prepare the queue futex */ |
1909 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1910 | ||
68924dc1 MD |
1911 | if (CMM_LOAD_SHARED(dispatch_thread_exit)) { |
1912 | break; | |
1913 | } | |
1914 | ||
099e26bd | 1915 | do { |
d0b96690 | 1916 | struct ust_app *app = NULL; |
7972aab2 | 1917 | ust_cmd = NULL; |
d0b96690 | 1918 | |
f45e313d DG |
1919 | /* |
1920 | * Make sure we don't have node(s) that have hung up before receiving | |
1921 | * the notify socket. This is to clean the list in order to avoid | |
1922 | * memory leaks from notify socket that are never seen. | |
1923 | */ | |
1924 | sanitize_wait_queue(&wait_queue); | |
1925 | ||
12e2b881 | 1926 | health_code_update(); |
099e26bd | 1927 | /* Dequeue command for registration */ |
8bdee6e2 | 1928 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 1929 | if (node == NULL) { |
00a17c97 | 1930 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1931 | /* Continue thread execution */ |
1932 | break; | |
1933 | } | |
1934 | ||
1935 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1936 | ||
2f50c8a3 DG |
1937 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1938 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1939 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1940 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1941 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1942 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1943 | |
1944 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1945 | wait_node = zmalloc(sizeof(*wait_node)); | |
1946 | if (!wait_node) { | |
1947 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1948 | ret = close(ust_cmd->sock); |
1949 | if (ret < 0) { | |
1950 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1951 | } | |
51dec90d | 1952 | lttng_fd_put(LTTNG_FD_APPS, 1); |
7972aab2 | 1953 | free(ust_cmd); |
d0b96690 DG |
1954 | goto error; |
1955 | } | |
1956 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1957 | ||
1958 | /* Create application object if socket is CMD. */ | |
1959 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1960 | ust_cmd->sock); | |
1961 | if (!wait_node->app) { | |
1962 | ret = close(ust_cmd->sock); | |
1963 | if (ret < 0) { | |
1964 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1965 | } |
51dec90d | 1966 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 1967 | free(wait_node); |
7972aab2 | 1968 | free(ust_cmd); |
d0b96690 DG |
1969 | continue; |
1970 | } | |
1971 | /* | |
1972 | * Add application to the wait queue so we can set the notify | |
1973 | * socket before putting this object in the global ht. | |
1974 | */ | |
f45e313d DG |
1975 | cds_list_add(&wait_node->head, &wait_queue.head); |
1976 | wait_queue.count++; | |
d0b96690 | 1977 | |
7972aab2 | 1978 | free(ust_cmd); |
d0b96690 DG |
1979 | /* |
1980 | * We have to continue here since we don't have the notify | |
1981 | * socket and the application MUST be added to the hash table | |
1982 | * only at that moment. | |
1983 | */ | |
1984 | continue; | |
1985 | } else { | |
1986 | /* | |
1987 | * Look for the application in the local wait queue and set the | |
1988 | * notify socket if found. | |
1989 | */ | |
d88aee68 | 1990 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1991 | &wait_queue.head, head) { |
12e2b881 | 1992 | health_code_update(); |
d0b96690 DG |
1993 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1994 | wait_node->app->notify_sock = ust_cmd->sock; | |
1995 | cds_list_del(&wait_node->head); | |
f45e313d | 1996 | wait_queue.count--; |
d0b96690 DG |
1997 | app = wait_node->app; |
1998 | free(wait_node); | |
1999 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
2000 | break; | |
2001 | } | |
2002 | } | |
020d7f60 DG |
2003 | |
2004 | /* | |
2005 | * With no application at this stage the received socket is | |
2006 | * basically useless so close it before we free the cmd data | |
2007 | * structure for good. | |
2008 | */ | |
2009 | if (!app) { | |
2010 | ret = close(ust_cmd->sock); | |
2011 | if (ret < 0) { | |
2012 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
2013 | } | |
51dec90d | 2014 | lttng_fd_put(LTTNG_FD_APPS, 1); |
020d7f60 | 2015 | } |
7972aab2 | 2016 | free(ust_cmd); |
d0b96690 DG |
2017 | } |
2018 | ||
2019 | if (app) { | |
d0b96690 DG |
2020 | /* |
2021 | * @session_lock_list | |
2022 | * | |
2023 | * Lock the global session list so from the register up to the | |
2024 | * registration done message, no thread can see the application | |
2025 | * and change its state. | |
2026 | */ | |
2027 | session_lock_list(); | |
2028 | rcu_read_lock(); | |
d88aee68 | 2029 | |
d0b96690 DG |
2030 | /* |
2031 | * Add application to the global hash table. This needs to be | |
2032 | * done before the update to the UST registry can locate the | |
2033 | * application. | |
2034 | */ | |
2035 | ust_app_add(app); | |
d88aee68 DG |
2036 | |
2037 | /* Set app version. This call will print an error if needed. */ | |
2038 | (void) ust_app_version(app); | |
2039 | ||
2040 | /* Send notify socket through the notify pipe. */ | |
2041 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
2042 | app->notify_sock); | |
2043 | if (ret < 0) { | |
2044 | rcu_read_unlock(); | |
2045 | session_unlock_list(); | |
b85dc84c DG |
2046 | /* |
2047 | * No notify thread, stop the UST tracing. However, this is | |
2048 | * not an internal error of the this thread thus setting | |
2049 | * the health error code to a normal exit. | |
2050 | */ | |
2051 | err = 0; | |
d88aee68 | 2052 | goto error; |
6620da75 | 2053 | } |
d88aee68 | 2054 | |
d0b96690 DG |
2055 | /* |
2056 | * Update newly registered application with the tracing | |
2057 | * registry info already enabled information. | |
2058 | */ | |
2059 | update_ust_app(app->sock); | |
d88aee68 DG |
2060 | |
2061 | /* | |
2062 | * Don't care about return value. Let the manage apps threads | |
2063 | * handle app unregistration upon socket close. | |
2064 | */ | |
fb45065e | 2065 | (void) ust_app_register_done(app); |
d88aee68 DG |
2066 | |
2067 | /* | |
2068 | * Even if the application socket has been closed, send the app | |
2069 | * to the thread and unregistration will take place at that | |
2070 | * place. | |
2071 | */ | |
2072 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 2073 | if (ret < 0) { |
d88aee68 DG |
2074 | rcu_read_unlock(); |
2075 | session_unlock_list(); | |
b85dc84c DG |
2076 | /* |
2077 | * No apps. thread, stop the UST tracing. However, this is | |
2078 | * not an internal error of the this thread thus setting | |
2079 | * the health error code to a normal exit. | |
2080 | */ | |
2081 | err = 0; | |
d88aee68 | 2082 | goto error; |
d0b96690 | 2083 | } |
d88aee68 | 2084 | |
d0b96690 DG |
2085 | rcu_read_unlock(); |
2086 | session_unlock_list(); | |
099e26bd | 2087 | } |
099e26bd DG |
2088 | } while (node != NULL); |
2089 | ||
12e2b881 | 2090 | health_poll_entry(); |
099e26bd DG |
2091 | /* Futex wait on queue. Blocking call on futex() */ |
2092 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 2093 | health_poll_exit(); |
099e26bd | 2094 | } |
12e2b881 MD |
2095 | /* Normal exit, no error */ |
2096 | err = 0; | |
099e26bd DG |
2097 | |
2098 | error: | |
d88aee68 DG |
2099 | /* Clean up wait queue. */ |
2100 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 2101 | &wait_queue.head, head) { |
d88aee68 | 2102 | cds_list_del(&wait_node->head); |
f45e313d | 2103 | wait_queue.count--; |
d88aee68 DG |
2104 | free(wait_node); |
2105 | } | |
2106 | ||
772b8f4d MD |
2107 | /* Empty command queue. */ |
2108 | for (;;) { | |
2109 | /* Dequeue command for registration */ | |
2110 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); | |
2111 | if (node == NULL) { | |
2112 | break; | |
2113 | } | |
2114 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
2115 | ret = close(ust_cmd->sock); | |
2116 | if (ret < 0) { | |
2117 | PERROR("close ust sock exit dispatch %d", ust_cmd->sock); | |
2118 | } | |
2119 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2120 | free(ust_cmd); | |
2121 | } | |
2122 | ||
9ad42ec1 | 2123 | error_testpoint: |
099e26bd | 2124 | DBG("Dispatch thread dying"); |
12e2b881 MD |
2125 | if (err) { |
2126 | health_error(); | |
2127 | ERR("Health error occurred in %s", __func__); | |
2128 | } | |
8782cc74 | 2129 | health_unregister(health_sessiond); |
78d8cf23 | 2130 | rcu_unregister_thread(); |
099e26bd DG |
2131 | return NULL; |
2132 | } | |
2133 | ||
2134 | /* | |
2135 | * This thread manage application registration. | |
2136 | */ | |
2137 | static void *thread_registration_apps(void *data) | |
1d4b027a | 2138 | { |
139ac872 | 2139 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
2140 | uint32_t revents, nb_fd; |
2141 | struct lttng_poll_event events; | |
099e26bd DG |
2142 | /* |
2143 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
2144 | * freed in the manage apps thread. | |
2145 | */ | |
2146 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 2147 | |
099e26bd | 2148 | DBG("[thread] Manage application registration started"); |
1d4b027a | 2149 | |
6c71277b | 2150 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG); |
927ca06a | 2151 | |
e547b070 | 2152 | if (testpoint(sessiond_thread_registration_apps)) { |
6993eeb3 CB |
2153 | goto error_testpoint; |
2154 | } | |
8ac94142 | 2155 | |
1d4b027a DG |
2156 | ret = lttcomm_listen_unix_sock(apps_sock); |
2157 | if (ret < 0) { | |
76d7553f | 2158 | goto error_listen; |
1d4b027a DG |
2159 | } |
2160 | ||
5eb91c98 DG |
2161 | /* |
2162 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
2163 | * more will be added to this poll set. | |
2164 | */ | |
d0b96690 | 2165 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 2166 | if (ret < 0) { |
76d7553f | 2167 | goto error_create_poll; |
5eb91c98 | 2168 | } |
273ea72c | 2169 | |
5eb91c98 DG |
2170 | /* Add the application registration socket */ |
2171 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
2172 | if (ret < 0) { | |
76d7553f | 2173 | goto error_poll_add; |
5eb91c98 | 2174 | } |
273ea72c | 2175 | |
1d4b027a | 2176 | /* Notify all applications to register */ |
0fdd1e2c DG |
2177 | ret = notify_ust_apps(1); |
2178 | if (ret < 0) { | |
2179 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
2180 | "Execution continues but there might be problem for already\n" |
2181 | "running applications that wishes to register."); | |
0fdd1e2c | 2182 | } |
1d4b027a DG |
2183 | |
2184 | while (1) { | |
2185 | DBG("Accepting application registration"); | |
273ea72c DG |
2186 | |
2187 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 2188 | restart: |
a78af745 | 2189 | health_poll_entry(); |
5eb91c98 | 2190 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 2191 | health_poll_exit(); |
273ea72c | 2192 | if (ret < 0) { |
88f2b785 MD |
2193 | /* |
2194 | * Restart interrupted system call. | |
2195 | */ | |
2196 | if (errno == EINTR) { | |
2197 | goto restart; | |
2198 | } | |
273ea72c DG |
2199 | goto error; |
2200 | } | |
2201 | ||
0d9c5d77 DG |
2202 | nb_fd = ret; |
2203 | ||
5eb91c98 | 2204 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 2205 | health_code_update(); |
139ac872 | 2206 | |
5eb91c98 DG |
2207 | /* Fetch once the poll data */ |
2208 | revents = LTTNG_POLL_GETEV(&events, i); | |
2209 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 2210 | |
fd20dac9 MD |
2211 | if (!revents) { |
2212 | /* No activity for this FD (poll implementation). */ | |
2213 | continue; | |
2214 | } | |
2215 | ||
5eb91c98 | 2216 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 2217 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 2218 | if (ret) { |
139ac872 MD |
2219 | err = 0; |
2220 | goto exit; | |
90014c57 | 2221 | } |
1d4b027a | 2222 | |
5eb91c98 DG |
2223 | /* Event on the registration socket */ |
2224 | if (pollfd == apps_sock) { | |
03e43155 | 2225 | if (revents & LPOLLIN) { |
5eb91c98 DG |
2226 | sock = lttcomm_accept_unix_sock(apps_sock); |
2227 | if (sock < 0) { | |
2228 | goto error; | |
2229 | } | |
099e26bd | 2230 | |
16c5c8fa DG |
2231 | /* |
2232 | * Set socket timeout for both receiving and ending. | |
2233 | * app_socket_timeout is in seconds, whereas | |
2234 | * lttcomm_setsockopt_rcv_timeout and | |
2235 | * lttcomm_setsockopt_snd_timeout expect msec as | |
2236 | * parameter. | |
2237 | */ | |
28ce0ff2 JG |
2238 | if (app_socket_timeout >= 0) { |
2239 | (void) lttcomm_setsockopt_rcv_timeout(sock, | |
2240 | app_socket_timeout * 1000); | |
2241 | (void) lttcomm_setsockopt_snd_timeout(sock, | |
2242 | app_socket_timeout * 1000); | |
2243 | } | |
16c5c8fa | 2244 | |
b662582b DG |
2245 | /* |
2246 | * Set the CLOEXEC flag. Return code is useless because | |
2247 | * either way, the show must go on. | |
2248 | */ | |
2249 | (void) utils_set_fd_cloexec(sock); | |
2250 | ||
5eb91c98 | 2251 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 2252 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 2253 | if (ust_cmd == NULL) { |
76d7553f | 2254 | PERROR("ust command zmalloc"); |
41ed8e47 MD |
2255 | ret = close(sock); |
2256 | if (ret) { | |
2257 | PERROR("close"); | |
2258 | } | |
5eb91c98 DG |
2259 | goto error; |
2260 | } | |
1d4b027a | 2261 | |
5eb91c98 DG |
2262 | /* |
2263 | * Using message-based transmissions to ensure we don't | |
2264 | * have to deal with partially received messages. | |
2265 | */ | |
4063050c MD |
2266 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
2267 | if (ret < 0) { | |
2268 | ERR("Exhausted file descriptors allowed for applications."); | |
2269 | free(ust_cmd); | |
2270 | ret = close(sock); | |
2271 | if (ret) { | |
2272 | PERROR("close"); | |
2273 | } | |
2274 | sock = -1; | |
2275 | continue; | |
2276 | } | |
d88aee68 | 2277 | |
840cb59c | 2278 | health_code_update(); |
d0b96690 DG |
2279 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
2280 | if (ret < 0) { | |
5eb91c98 | 2281 | free(ust_cmd); |
d0b96690 | 2282 | /* Close socket of the application. */ |
76d7553f MD |
2283 | ret = close(sock); |
2284 | if (ret) { | |
2285 | PERROR("close"); | |
2286 | } | |
4063050c | 2287 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 2288 | sock = -1; |
5eb91c98 DG |
2289 | continue; |
2290 | } | |
840cb59c | 2291 | health_code_update(); |
099e26bd | 2292 | |
5eb91c98 | 2293 | ust_cmd->sock = sock; |
34a2494f | 2294 | sock = -1; |
099e26bd | 2295 | |
5eb91c98 DG |
2296 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
2297 | " gid:%d sock:%d name:%s (version %d.%d)", | |
2298 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
2299 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
2300 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
2301 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 2302 | |
5eb91c98 DG |
2303 | /* |
2304 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 2305 | * has been taken! This apps will be part of the *system*. |
5eb91c98 | 2306 | */ |
8bdee6e2 | 2307 | cds_wfcq_enqueue(&ust_cmd_queue.head, &ust_cmd_queue.tail, &ust_cmd->node); |
5eb91c98 DG |
2308 | |
2309 | /* | |
2310 | * Wake the registration queue futex. Implicit memory | |
8bdee6e2 | 2311 | * barrier with the exchange in cds_wfcq_enqueue. |
5eb91c98 DG |
2312 | */ |
2313 | futex_nto1_wake(&ust_cmd_queue.futex); | |
03e43155 MD |
2314 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2315 | ERR("Register apps socket poll error"); | |
2316 | goto error; | |
2317 | } else { | |
2318 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2319 | goto error; | |
5eb91c98 DG |
2320 | } |
2321 | } | |
90014c57 | 2322 | } |
1d4b027a DG |
2323 | } |
2324 | ||
139ac872 | 2325 | exit: |
1d4b027a | 2326 | error: |
0fdd1e2c DG |
2327 | /* Notify that the registration thread is gone */ |
2328 | notify_ust_apps(0); | |
2329 | ||
a4b35e07 | 2330 | if (apps_sock >= 0) { |
76d7553f MD |
2331 | ret = close(apps_sock); |
2332 | if (ret) { | |
2333 | PERROR("close"); | |
2334 | } | |
a4b35e07 | 2335 | } |
46c3f085 | 2336 | if (sock >= 0) { |
76d7553f MD |
2337 | ret = close(sock); |
2338 | if (ret) { | |
2339 | PERROR("close"); | |
2340 | } | |
4063050c | 2341 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 2342 | } |
273ea72c | 2343 | unlink(apps_unix_sock_path); |
0fdd1e2c | 2344 | |
76d7553f | 2345 | error_poll_add: |
5eb91c98 | 2346 | lttng_poll_clean(&events); |
76d7553f MD |
2347 | error_listen: |
2348 | error_create_poll: | |
6993eeb3 | 2349 | error_testpoint: |
76d7553f | 2350 | DBG("UST Registration thread cleanup complete"); |
9ad42ec1 MD |
2351 | if (err) { |
2352 | health_error(); | |
2353 | ERR("Health error occurred in %s", __func__); | |
2354 | } | |
8782cc74 | 2355 | health_unregister(health_sessiond); |
5eb91c98 | 2356 | |
1d4b027a DG |
2357 | return NULL; |
2358 | } | |
2359 | ||
8c0faa1d | 2360 | /* |
3bd1e081 | 2361 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 2362 | * exec or it will fails. |
8c0faa1d | 2363 | */ |
3bd1e081 | 2364 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 2365 | { |
a23ec3a7 | 2366 | int ret, clock_ret; |
ee0b0061 DG |
2367 | struct timespec timeout; |
2368 | ||
13a7bce3 JG |
2369 | /* |
2370 | * Make sure we set the readiness flag to 0 because we are NOT ready. | |
2371 | * This access to consumer_thread_is_ready does not need to be | |
2372 | * protected by consumer_data.cond_mutex (yet) since the consumer | |
2373 | * management thread has not been started at this point. | |
2374 | */ | |
a23ec3a7 | 2375 | consumer_data->consumer_thread_is_ready = 0; |
8c0faa1d | 2376 | |
a23ec3a7 DG |
2377 | /* Setup pthread condition */ |
2378 | ret = pthread_condattr_init(&consumer_data->condattr); | |
4a15001e | 2379 | if (ret) { |
a23ec3a7 DG |
2380 | errno = ret; |
2381 | PERROR("pthread_condattr_init consumer data"); | |
2382 | goto error; | |
2383 | } | |
2384 | ||
2385 | /* | |
2386 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
2387 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
2388 | * for a more details and how we noticed it. | |
2389 | */ | |
2390 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
4a15001e | 2391 | if (ret) { |
a23ec3a7 DG |
2392 | errno = ret; |
2393 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
2394 | goto error; |
2395 | } | |
8c0faa1d | 2396 | |
a23ec3a7 | 2397 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
4a15001e | 2398 | if (ret) { |
a23ec3a7 DG |
2399 | errno = ret; |
2400 | PERROR("pthread_cond_init consumer data"); | |
2401 | goto error; | |
2402 | } | |
2403 | ||
1a1a34b4 MJ |
2404 | ret = pthread_create(&consumer_data->thread, default_pthread_attr(), |
2405 | thread_manage_consumer, consumer_data); | |
4a15001e MD |
2406 | if (ret) { |
2407 | errno = ret; | |
3bd1e081 | 2408 | PERROR("pthread_create consumer"); |
ee0b0061 | 2409 | ret = -1; |
8c0faa1d DG |
2410 | goto error; |
2411 | } | |
2412 | ||
a23ec3a7 DG |
2413 | /* We are about to wait on a pthread condition */ |
2414 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
2415 | ||
ee0b0061 | 2416 | /* Get time for sem_timedwait absolute timeout */ |
389fbf04 | 2417 | clock_ret = lttng_clock_gettime(CLOCK_MONOTONIC, &timeout); |
a23ec3a7 DG |
2418 | /* |
2419 | * Set the timeout for the condition timed wait even if the clock gettime | |
2420 | * call fails since we might loop on that call and we want to avoid to | |
2421 | * increment the timeout too many times. | |
2422 | */ | |
2423 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
2424 | ||
2425 | /* | |
2426 | * The following loop COULD be skipped in some conditions so this is why we | |
2427 | * set ret to 0 in order to make sure at least one round of the loop is | |
2428 | * done. | |
2429 | */ | |
2430 | ret = 0; | |
2431 | ||
2432 | /* | |
2433 | * Loop until the condition is reached or when a timeout is reached. Note | |
2434 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
2435 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
2436 | * possible. This loop does not take any chances and works with both of | |
2437 | * them. | |
2438 | */ | |
2439 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
2440 | if (clock_ret < 0) { | |
2441 | PERROR("clock_gettime spawn consumer"); | |
2442 | /* Infinite wait for the consumerd thread to be ready */ | |
2443 | ret = pthread_cond_wait(&consumer_data->cond, | |
2444 | &consumer_data->cond_mutex); | |
2445 | } else { | |
2446 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
2447 | &consumer_data->cond_mutex, &timeout); | |
2448 | } | |
ee0b0061 | 2449 | } |
8c0faa1d | 2450 | |
a23ec3a7 DG |
2451 | /* Release the pthread condition */ |
2452 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
2453 | ||
2454 | if (ret != 0) { | |
2455 | errno = ret; | |
2456 | if (ret == ETIMEDOUT) { | |
4282f9a3 DG |
2457 | int pth_ret; |
2458 | ||
ee0b0061 DG |
2459 | /* |
2460 | * Call has timed out so we kill the kconsumerd_thread and return | |
2461 | * an error. | |
2462 | */ | |
a23ec3a7 DG |
2463 | ERR("Condition timed out. The consumer thread was never ready." |
2464 | " Killing it"); | |
4282f9a3 DG |
2465 | pth_ret = pthread_cancel(consumer_data->thread); |
2466 | if (pth_ret < 0) { | |
3bd1e081 | 2467 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
2468 | } |
2469 | } else { | |
a23ec3a7 | 2470 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 | 2471 | } |
4282f9a3 DG |
2472 | /* Caller is expecting a negative value on failure. */ |
2473 | ret = -1; | |
ee0b0061 DG |
2474 | goto error; |
2475 | } | |
2476 | ||
3bd1e081 MD |
2477 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2478 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2479 | ERR("Consumerd did not start"); |
3bd1e081 | 2480 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2481 | goto error; |
2482 | } | |
3bd1e081 | 2483 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2484 | |
8c0faa1d DG |
2485 | return 0; |
2486 | ||
2487 | error: | |
2488 | return ret; | |
2489 | } | |
2490 | ||
d9800920 | 2491 | /* |
3bd1e081 | 2492 | * Join consumer thread |
d9800920 | 2493 | */ |
3bd1e081 | 2494 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2495 | { |
2496 | void *status; | |
cf3af59e | 2497 | |
e8209f6b DG |
2498 | /* Consumer pid must be a real one. */ |
2499 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2500 | int ret; |
3bd1e081 | 2501 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2502 | if (ret) { |
4a15001e | 2503 | PERROR("Error killing consumer daemon"); |
cf3af59e MD |
2504 | return ret; |
2505 | } | |
3bd1e081 | 2506 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2507 | } else { |
2508 | return 0; | |
2509 | } | |
2510 | } | |
2511 | ||
8c0faa1d | 2512 | /* |
3bd1e081 | 2513 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2514 | * |
d063d709 | 2515 | * Return pid if successful else -1. |
8c0faa1d | 2516 | */ |
3bd1e081 | 2517 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2518 | { |
2519 | int ret; | |
2520 | pid_t pid; | |
94c55f17 | 2521 | const char *consumer_to_use; |
53086306 | 2522 | const char *verbosity; |
94c55f17 | 2523 | struct stat st; |
8c0faa1d | 2524 | |
3bd1e081 | 2525 | DBG("Spawning consumerd"); |
c49dc785 | 2526 | |
8c0faa1d DG |
2527 | pid = fork(); |
2528 | if (pid == 0) { | |
2529 | /* | |
3bd1e081 | 2530 | * Exec consumerd. |
8c0faa1d | 2531 | */ |
daee5345 | 2532 | if (opt_verbose_consumer) { |
53086306 | 2533 | verbosity = "--verbose"; |
4421f712 | 2534 | } else if (lttng_opt_quiet) { |
53086306 | 2535 | verbosity = "--quiet"; |
4421f712 DG |
2536 | } else { |
2537 | verbosity = ""; | |
53086306 | 2538 | } |
4421f712 | 2539 | |
3bd1e081 MD |
2540 | switch (consumer_data->type) { |
2541 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2542 | /* |
c7704d57 DG |
2543 | * Find out which consumerd to execute. We will first try the |
2544 | * 64-bit path, then the sessiond's installation directory, and | |
2545 | * fallback on the 32-bit one, | |
94c55f17 | 2546 | */ |
63a799e8 AM |
2547 | DBG3("Looking for a kernel consumer at these locations:"); |
2548 | DBG3(" 1) %s", consumerd64_bin); | |
2549 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
2550 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 2551 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 2552 | DBG3("Found location #1"); |
94c55f17 | 2553 | consumer_to_use = consumerd64_bin; |
94c55f17 | 2554 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 2555 | DBG3("Found location #2"); |
94c55f17 | 2556 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 2557 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 2558 | DBG3("Found location #3"); |
eb1e0bd4 | 2559 | consumer_to_use = consumerd32_bin; |
94c55f17 | 2560 | } else { |
63a799e8 | 2561 | DBG("Could not find any valid consumerd executable"); |
4282f9a3 | 2562 | ret = -EINVAL; |
5b49a21f | 2563 | goto error; |
94c55f17 AM |
2564 | } |
2565 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
4282f9a3 | 2566 | ret = execl(consumer_to_use, |
94c55f17 AM |
2567 | "lttng-consumerd", verbosity, "-k", |
2568 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2569 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2570 | "--group", tracing_group_name, |
94c55f17 | 2571 | NULL); |
3bd1e081 | 2572 | break; |
7753dea8 MD |
2573 | case LTTNG_CONSUMER64_UST: |
2574 | { | |
b1e0b6b6 | 2575 | char *tmpnew = NULL; |
8f4905da MD |
2576 | |
2577 | if (consumerd64_libdir[0] != '\0') { | |
2578 | char *tmp; | |
2579 | size_t tmplen; | |
2580 | ||
e8fa9fb0 | 2581 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2582 | if (!tmp) { |
2583 | tmp = ""; | |
2584 | } | |
2585 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2586 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
2587 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2588 | if (!tmpnew) { | |
2589 | ret = -ENOMEM; | |
2590 | goto error; | |
2591 | } | |
2592 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2593 | strcat(tmpnew, consumerd64_libdir); | |
2594 | if (tmp[0] != '\0') { | |
2595 | strcat(tmpnew, ":"); | |
2596 | strcat(tmpnew, tmp); | |
2597 | } | |
2598 | ret = putenv(tmpnew); | |
2599 | if (ret) { | |
2600 | ret = -errno; | |
c6f76da9 | 2601 | free(tmpnew); |
8f4905da MD |
2602 | goto error; |
2603 | } | |
2604 | } | |
94c55f17 | 2605 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 2606 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2607 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2608 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2609 | "--group", tracing_group_name, |
7753dea8 | 2610 | NULL); |
8f4905da MD |
2611 | if (consumerd64_libdir[0] != '\0') { |
2612 | free(tmpnew); | |
2613 | } | |
3bd1e081 | 2614 | break; |
7753dea8 MD |
2615 | } |
2616 | case LTTNG_CONSUMER32_UST: | |
2617 | { | |
937dde8e | 2618 | char *tmpnew = NULL; |
8f4905da MD |
2619 | |
2620 | if (consumerd32_libdir[0] != '\0') { | |
2621 | char *tmp; | |
2622 | size_t tmplen; | |
2623 | ||
e8fa9fb0 | 2624 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2625 | if (!tmp) { |
2626 | tmp = ""; | |
2627 | } | |
2628 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2629 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
2630 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2631 | if (!tmpnew) { | |
2632 | ret = -ENOMEM; | |
2633 | goto error; | |
2634 | } | |
2635 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2636 | strcat(tmpnew, consumerd32_libdir); | |
2637 | if (tmp[0] != '\0') { | |
2638 | strcat(tmpnew, ":"); | |
2639 | strcat(tmpnew, tmp); | |
2640 | } | |
2641 | ret = putenv(tmpnew); | |
2642 | if (ret) { | |
2643 | ret = -errno; | |
c6f76da9 | 2644 | free(tmpnew); |
8f4905da MD |
2645 | goto error; |
2646 | } | |
2647 | } | |
94c55f17 | 2648 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 2649 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2650 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2651 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2652 | "--group", tracing_group_name, |
7753dea8 | 2653 | NULL); |
8f4905da MD |
2654 | if (consumerd32_libdir[0] != '\0') { |
2655 | free(tmpnew); | |
2656 | } | |
7753dea8 MD |
2657 | break; |
2658 | } | |
3bd1e081 | 2659 | default: |
db58870b | 2660 | ERR("unknown consumer type"); |
3bd1e081 MD |
2661 | exit(EXIT_FAILURE); |
2662 | } | |
8c0faa1d | 2663 | if (errno != 0) { |
4282f9a3 | 2664 | PERROR("Consumer execl()"); |
8c0faa1d | 2665 | } |
4282f9a3 | 2666 | /* Reaching this point, we got a failure on our execl(). */ |
8c0faa1d DG |
2667 | exit(EXIT_FAILURE); |
2668 | } else if (pid > 0) { | |
2669 | ret = pid; | |
8c0faa1d | 2670 | } else { |
76d7553f | 2671 | PERROR("start consumer fork"); |
8c0faa1d | 2672 | ret = -errno; |
8c0faa1d | 2673 | } |
8f4905da | 2674 | error: |
8c0faa1d DG |
2675 | return ret; |
2676 | } | |
2677 | ||
693bd40b | 2678 | /* |
3bd1e081 | 2679 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2680 | */ |
3bd1e081 | 2681 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2682 | { |
c617c0c6 | 2683 | int ret; |
edb8b045 DG |
2684 | |
2685 | /* | |
2686 | * Set the listen() state on the socket since there is a possible race | |
2687 | * between the exec() of the consumer daemon and this call if place in the | |
2688 | * consumer thread. See bug #366 for more details. | |
2689 | */ | |
2690 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2691 | if (ret < 0) { | |
2692 | goto error; | |
2693 | } | |
693bd40b | 2694 | |
3bd1e081 MD |
2695 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2696 | if (consumer_data->pid != 0) { | |
2697 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2698 | goto end; |
2699 | } | |
693bd40b | 2700 | |
3bd1e081 | 2701 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2702 | if (ret < 0) { |
3bd1e081 MD |
2703 | ERR("Spawning consumerd failed"); |
2704 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2705 | goto error; |
693bd40b | 2706 | } |
c49dc785 | 2707 | |
3bd1e081 MD |
2708 | /* Setting up the consumer_data pid */ |
2709 | consumer_data->pid = ret; | |
48842b30 | 2710 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2711 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2712 | |
3bd1e081 MD |
2713 | DBG2("Spawning consumer control thread"); |
2714 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2715 | if (ret < 0) { |
3bd1e081 | 2716 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2717 | goto error; |
2718 | } | |
2719 | ||
c49dc785 | 2720 | end: |
693bd40b DG |
2721 | return 0; |
2722 | ||
2723 | error: | |
331744e3 | 2724 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2725 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2726 | int err; |
2727 | ||
edb8b045 DG |
2728 | err = close(consumer_data->err_sock); |
2729 | if (err < 0) { | |
2730 | PERROR("close consumer data error socket"); | |
2731 | } | |
2732 | } | |
693bd40b DG |
2733 | return ret; |
2734 | } | |
2735 | ||
b73401da | 2736 | /* |
096102bd | 2737 | * Setup necessary data for kernel tracer action. |
b73401da | 2738 | */ |
096102bd | 2739 | static int init_kernel_tracer(void) |
b73401da DG |
2740 | { |
2741 | int ret; | |
b73401da | 2742 | |
096102bd DG |
2743 | /* Modprobe lttng kernel modules */ |
2744 | ret = modprobe_lttng_control(); | |
b73401da | 2745 | if (ret < 0) { |
b73401da DG |
2746 | goto error; |
2747 | } | |
2748 | ||
096102bd DG |
2749 | /* Open debugfs lttng */ |
2750 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2751 | if (kernel_tracer_fd < 0) { | |
2752 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b | 2753 | goto error_open; |
54d01ffb DG |
2754 | } |
2755 | ||
2f77fc4b DG |
2756 | /* Validate kernel version */ |
2757 | ret = kernel_validate_version(kernel_tracer_fd); | |
2758 | if (ret < 0) { | |
2759 | goto error_version; | |
b551a063 | 2760 | } |
54d01ffb | 2761 | |
2f77fc4b DG |
2762 | ret = modprobe_lttng_data(); |
2763 | if (ret < 0) { | |
2764 | goto error_modules; | |
54d01ffb DG |
2765 | } |
2766 | ||
2f77fc4b DG |
2767 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2768 | return 0; | |
2769 | ||
2770 | error_version: | |
2771 | modprobe_remove_lttng_control(); | |
2772 | ret = close(kernel_tracer_fd); | |
2773 | if (ret) { | |
2774 | PERROR("close"); | |
b551a063 | 2775 | } |
2f77fc4b | 2776 | kernel_tracer_fd = -1; |
f73fabfd | 2777 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2778 | |
2f77fc4b DG |
2779 | error_modules: |
2780 | ret = close(kernel_tracer_fd); | |
2781 | if (ret) { | |
2782 | PERROR("close"); | |
b551a063 | 2783 | } |
54d01ffb | 2784 | |
2f77fc4b DG |
2785 | error_open: |
2786 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2787 | |
2788 | error: | |
2f77fc4b DG |
2789 | WARN("No kernel tracer available"); |
2790 | kernel_tracer_fd = -1; | |
2791 | if (!is_root) { | |
f73fabfd | 2792 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2793 | } else { |
f73fabfd | 2794 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2795 | } |
54d01ffb DG |
2796 | } |
2797 | ||
2f77fc4b | 2798 | |
54d01ffb | 2799 | /* |
2f77fc4b DG |
2800 | * Copy consumer output from the tracing session to the domain session. The |
2801 | * function also applies the right modification on a per domain basis for the | |
2802 | * trace files destination directory. | |
36b588ed MD |
2803 | * |
2804 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2805 | */ |
2f77fc4b | 2806 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2807 | { |
2808 | int ret; | |
2f77fc4b DG |
2809 | const char *dir_name; |
2810 | struct consumer_output *consumer; | |
2811 | ||
2812 | assert(session); | |
2813 | assert(session->consumer); | |
54d01ffb | 2814 | |
b551a063 DG |
2815 | switch (domain) { |
2816 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2817 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2818 | /* |
2819 | * XXX: We should audit the session creation and what this function | |
2820 | * does "extra" in order to avoid a destroy since this function is used | |
2821 | * in the domain session creation (kernel and ust) only. Same for UST | |
2822 | * domain. | |
2823 | */ | |
2824 | if (session->kernel_session->consumer) { | |
6addfa37 | 2825 | consumer_output_put(session->kernel_session->consumer); |
09a90bcd | 2826 | } |
2f77fc4b DG |
2827 | session->kernel_session->consumer = |
2828 | consumer_copy_output(session->consumer); | |
2829 | /* Ease our life a bit for the next part */ | |
2830 | consumer = session->kernel_session->consumer; | |
2831 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 | 2832 | break; |
f20baf8e | 2833 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2834 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2835 | case LTTNG_DOMAIN_PYTHON: |
b551a063 | 2836 | case LTTNG_DOMAIN_UST: |
2f77fc4b | 2837 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd | 2838 | if (session->ust_session->consumer) { |
6addfa37 | 2839 | consumer_output_put(session->ust_session->consumer); |
09a90bcd | 2840 | } |
2f77fc4b DG |
2841 | session->ust_session->consumer = |
2842 | consumer_copy_output(session->consumer); | |
2843 | /* Ease our life a bit for the next part */ | |
2844 | consumer = session->ust_session->consumer; | |
2845 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2846 | break; |
2847 | default: | |
f73fabfd | 2848 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2849 | goto error; |
2850 | } | |
2851 | ||
2f77fc4b | 2852 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2853 | strncat(consumer->subdir, dir_name, |
2854 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2855 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2856 | ||
f73fabfd | 2857 | ret = LTTNG_OK; |
54d01ffb DG |
2858 | |
2859 | error: | |
2860 | return ret; | |
2861 | } | |
2862 | ||
00e2e675 | 2863 | /* |
2f77fc4b | 2864 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2865 | * |
2866 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2867 | */ |
2f77fc4b DG |
2868 | static int create_ust_session(struct ltt_session *session, |
2869 | struct lttng_domain *domain) | |
00e2e675 DG |
2870 | { |
2871 | int ret; | |
2f77fc4b | 2872 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2873 | |
a4b92340 | 2874 | assert(session); |
2f77fc4b DG |
2875 | assert(domain); |
2876 | assert(session->consumer); | |
a4b92340 | 2877 | |
2f77fc4b | 2878 | switch (domain->type) { |
f20baf8e | 2879 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2880 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2881 | case LTTNG_DOMAIN_PYTHON: |
2f77fc4b DG |
2882 | case LTTNG_DOMAIN_UST: |
2883 | break; | |
2884 | default: | |
2885 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2886 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2887 | goto error; |
2888 | } | |
2889 | ||
2f77fc4b DG |
2890 | DBG("Creating UST session"); |
2891 | ||
dec56f6c | 2892 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2893 | if (lus == NULL) { |
f73fabfd | 2894 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2895 | goto error; |
2896 | } | |
2897 | ||
2f77fc4b DG |
2898 | lus->uid = session->uid; |
2899 | lus->gid = session->gid; | |
2bba9e53 | 2900 | lus->output_traces = session->output_traces; |
27babd3a | 2901 | lus->snapshot_mode = session->snapshot_mode; |
ecc48a90 | 2902 | lus->live_timer_interval = session->live_timer; |
2f77fc4b | 2903 | session->ust_session = lus; |
d7ba1388 | 2904 | if (session->shm_path[0]) { |
3d071855 MD |
2905 | strncpy(lus->root_shm_path, session->shm_path, |
2906 | sizeof(lus->root_shm_path)); | |
2907 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2908 | strncpy(lus->shm_path, session->shm_path, |
2909 | sizeof(lus->shm_path)); | |
2910 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
2911 | strncat(lus->shm_path, "/ust", | |
2912 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
2913 | } | |
2f77fc4b DG |
2914 | /* Copy session output to the newly created UST session */ |
2915 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2916 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2917 | goto error; |
2918 | } | |
2919 | ||
f73fabfd | 2920 | return LTTNG_OK; |
00e2e675 DG |
2921 | |
2922 | error: | |
2f77fc4b DG |
2923 | free(lus); |
2924 | session->ust_session = NULL; | |
00e2e675 DG |
2925 | return ret; |
2926 | } | |
2927 | ||
2928 | /* | |
2f77fc4b | 2929 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2930 | */ |
2f77fc4b | 2931 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2932 | { |
2933 | int ret; | |
a4b92340 | 2934 | |
2f77fc4b | 2935 | DBG("Creating kernel session"); |
00e2e675 | 2936 | |
2f77fc4b DG |
2937 | ret = kernel_create_session(session, kernel_tracer_fd); |
2938 | if (ret < 0) { | |
f73fabfd | 2939 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2940 | goto error; |
2941 | } | |
2942 | ||
2f77fc4b DG |
2943 | /* Code flow safety */ |
2944 | assert(session->kernel_session); | |
2945 | ||
2946 | /* Copy session output to the newly created Kernel session */ | |
2947 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2948 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2949 | goto error; |
2950 | } | |
2951 | ||
2f77fc4b DG |
2952 | /* Create directory(ies) on local filesystem. */ |
2953 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2954 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2955 | ret = run_as_mkdir_recursive( | |
2956 | session->kernel_session->consumer->dst.trace_path, | |
2957 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2958 | if (ret < 0) { | |
df5b86c8 | 2959 | if (errno != EEXIST) { |
2f77fc4b | 2960 | ERR("Trace directory creation error"); |
00e2e675 DG |
2961 | goto error; |
2962 | } | |
00e2e675 | 2963 | } |
2f77fc4b | 2964 | } |
00e2e675 | 2965 | |
2f77fc4b DG |
2966 | session->kernel_session->uid = session->uid; |
2967 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2968 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2969 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2970 | |
f73fabfd | 2971 | return LTTNG_OK; |
00e2e675 | 2972 | |
2f77fc4b DG |
2973 | error: |
2974 | trace_kernel_destroy_session(session->kernel_session); | |
2975 | session->kernel_session = NULL; | |
2976 | return ret; | |
2977 | } | |
00e2e675 | 2978 | |
2f77fc4b DG |
2979 | /* |
2980 | * Count number of session permitted by uid/gid. | |
2981 | */ | |
2982 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2983 | { | |
2984 | unsigned int i = 0; | |
2985 | struct ltt_session *session; | |
07424f16 | 2986 | |
2f77fc4b DG |
2987 | DBG("Counting number of available session for UID %d GID %d", |
2988 | uid, gid); | |
2989 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2990 | /* |
2f77fc4b | 2991 | * Only list the sessions the user can control. |
00e2e675 | 2992 | */ |
2f77fc4b DG |
2993 | if (!session_access_ok(session, uid, gid)) { |
2994 | continue; | |
2995 | } | |
2996 | i++; | |
a4b92340 | 2997 | } |
2f77fc4b | 2998 | return i; |
00e2e675 DG |
2999 | } |
3000 | ||
54d01ffb DG |
3001 | /* |
3002 | * Process the command requested by the lttng client within the command | |
3003 | * context structure. This function make sure that the return structure (llm) | |
3004 | * is set and ready for transmission before returning. | |
3005 | * | |
3006 | * Return any error encountered or 0 for success. | |
53a80697 MD |
3007 | * |
3008 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
3009 | * |
3010 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 3011 | */ |
53a80697 MD |
3012 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
3013 | int *sock_error) | |
54d01ffb | 3014 | { |
f73fabfd | 3015 | int ret = LTTNG_OK; |
44d3bd01 | 3016 | int need_tracing_session = 1; |
2e09ba09 | 3017 | int need_domain; |
54d01ffb DG |
3018 | |
3019 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3020 | ||
3745d315 MD |
3021 | assert(!rcu_read_ongoing()); |
3022 | ||
53a80697 MD |
3023 | *sock_error = 0; |
3024 | ||
2e09ba09 MD |
3025 | switch (cmd_ctx->lsm->cmd_type) { |
3026 | case LTTNG_CREATE_SESSION: | |
27babd3a | 3027 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 3028 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 MD |
3029 | case LTTNG_DESTROY_SESSION: |
3030 | case LTTNG_LIST_SESSIONS: | |
3031 | case LTTNG_LIST_DOMAINS: | |
3032 | case LTTNG_START_TRACE: | |
3033 | case LTTNG_STOP_TRACE: | |
6d805429 | 3034 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
3035 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3036 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3037 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3038 | case LTTNG_SNAPSHOT_RECORD: | |
fb198a11 | 3039 | case LTTNG_SAVE_SESSION: |
d7ba1388 | 3040 | case LTTNG_SET_SESSION_SHM_PATH: |
eded6438 | 3041 | case LTTNG_REGENERATE_METADATA: |
c2561365 | 3042 | case LTTNG_REGENERATE_STATEDUMP: |
2e09ba09 | 3043 | need_domain = 0; |
3aace903 | 3044 | break; |
2e09ba09 MD |
3045 | default: |
3046 | need_domain = 1; | |
3047 | } | |
3048 | ||
3049 | if (opt_no_kernel && need_domain | |
3050 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 3051 | if (!is_root) { |
f73fabfd | 3052 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 3053 | } else { |
f73fabfd | 3054 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 3055 | } |
4fba7219 DG |
3056 | goto error; |
3057 | } | |
3058 | ||
8d3113b2 DG |
3059 | /* Deny register consumer if we already have a spawned consumer. */ |
3060 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
3061 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
3062 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 3063 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 3064 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
3065 | goto error; |
3066 | } | |
3067 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
3068 | } | |
3069 | ||
54d01ffb DG |
3070 | /* |
3071 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3072 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3073 | * command. |
3074 | */ | |
3075 | switch(cmd_ctx->lsm->cmd_type) { | |
3076 | case LTTNG_LIST_SESSIONS: | |
3077 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 3078 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
3079 | case LTTNG_LIST_DOMAINS: |
3080 | case LTTNG_LIST_CHANNELS: | |
3081 | case LTTNG_LIST_EVENTS: | |
834978fd | 3082 | case LTTNG_LIST_SYSCALLS: |
a5dfbb9d | 3083 | case LTTNG_LIST_TRACKER_PIDS: |
5cd0780d | 3084 | case LTTNG_DATA_PENDING: |
54d01ffb DG |
3085 | break; |
3086 | default: | |
3087 | /* Setup lttng message with no payload */ | |
6e10c9b9 | 3088 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); |
54d01ffb DG |
3089 | if (ret < 0) { |
3090 | /* This label does not try to unlock the session */ | |
3091 | goto init_setup_error; | |
3092 | } | |
3093 | } | |
3094 | ||
3095 | /* Commands that DO NOT need a session. */ | |
3096 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 3097 | case LTTNG_CREATE_SESSION: |
27babd3a | 3098 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 3099 | case LTTNG_CREATE_SESSION_LIVE: |
54d01ffb DG |
3100 | case LTTNG_LIST_SESSIONS: |
3101 | case LTTNG_LIST_TRACEPOINTS: | |
834978fd | 3102 | case LTTNG_LIST_SYSCALLS: |
f37d259d | 3103 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
fb198a11 | 3104 | case LTTNG_SAVE_SESSION: |
44d3bd01 | 3105 | need_tracing_session = 0; |
54d01ffb DG |
3106 | break; |
3107 | default: | |
3108 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
3109 | /* |
3110 | * We keep the session list lock across _all_ commands | |
3111 | * for now, because the per-session lock does not | |
3112 | * handle teardown properly. | |
3113 | */ | |
74babd95 | 3114 | session_lock_list(); |
54d01ffb DG |
3115 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
3116 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 3117 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
3118 | goto error; |
3119 | } else { | |
3120 | /* Acquire lock for the session */ | |
3121 | session_lock(cmd_ctx->session); | |
3122 | } | |
3123 | break; | |
3124 | } | |
b389abbe | 3125 | |
5f3ecf22 DG |
3126 | /* |
3127 | * Commands that need a valid session but should NOT create one if none | |
3128 | * exists. Instead of creating one and destroying it when the command is | |
3129 | * handled, process that right before so we save some round trip in useless | |
3130 | * code path. | |
3131 | */ | |
3132 | switch (cmd_ctx->lsm->cmd_type) { | |
3133 | case LTTNG_DISABLE_CHANNEL: | |
3134 | case LTTNG_DISABLE_EVENT: | |
5f3ecf22 DG |
3135 | switch (cmd_ctx->lsm->domain.type) { |
3136 | case LTTNG_DOMAIN_KERNEL: | |
3137 | if (!cmd_ctx->session->kernel_session) { | |
3138 | ret = LTTNG_ERR_NO_CHANNEL; | |
3139 | goto error; | |
3140 | } | |
3141 | break; | |
3142 | case LTTNG_DOMAIN_JUL: | |
5cdb6027 | 3143 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3144 | case LTTNG_DOMAIN_PYTHON: |
5f3ecf22 DG |
3145 | case LTTNG_DOMAIN_UST: |
3146 | if (!cmd_ctx->session->ust_session) { | |
3147 | ret = LTTNG_ERR_NO_CHANNEL; | |
3148 | goto error; | |
3149 | } | |
3150 | break; | |
3151 | default: | |
3152 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3153 | goto error; | |
3154 | } | |
3155 | default: | |
3156 | break; | |
3157 | } | |
3158 | ||
2e09ba09 MD |
3159 | if (!need_domain) { |
3160 | goto skip_domain; | |
3161 | } | |
a4b92340 | 3162 | |
54d01ffb DG |
3163 | /* |
3164 | * Check domain type for specific "pre-action". | |
3165 | */ | |
3166 | switch (cmd_ctx->lsm->domain.type) { | |
3167 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 3168 | if (!is_root) { |
f73fabfd | 3169 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
3170 | goto error; |
3171 | } | |
3172 | ||
54d01ffb | 3173 | /* Kernel tracer check */ |
a4b35e07 | 3174 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3175 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3176 | ret = init_kernel_tracer(); |
3177 | if (ret != 0) { | |
54d01ffb DG |
3178 | goto error; |
3179 | } | |
3180 | } | |
5eb91c98 | 3181 | |
5c827ce0 DG |
3182 | /* Consumer is in an ERROR state. Report back to client */ |
3183 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3184 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3185 | goto error; |
3186 | } | |
3187 | ||
54d01ffb | 3188 | /* Need a session for kernel command */ |
44d3bd01 | 3189 | if (need_tracing_session) { |
54d01ffb | 3190 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3191 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3192 | if (ret < 0) { |
f73fabfd | 3193 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
3194 | goto error; |
3195 | } | |
b389abbe | 3196 | } |
7d29a247 | 3197 | |
54d01ffb | 3198 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3199 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3200 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 3201 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3202 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3203 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3204 | if (ret < 0) { |
f73fabfd | 3205 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 3206 | goto error; |
950131af | 3207 | } |
5c827ce0 | 3208 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
3209 | } else { |
3210 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3211 | } |
173af62f | 3212 | |
a4b92340 DG |
3213 | /* |
3214 | * The consumer was just spawned so we need to add the socket to | |
3215 | * the consumer output of the session if exist. | |
3216 | */ | |
3217 | ret = consumer_create_socket(&kconsumer_data, | |
3218 | cmd_ctx->session->kernel_session->consumer); | |
3219 | if (ret < 0) { | |
3220 | goto error; | |
173af62f | 3221 | } |
0d0c377a | 3222 | } |
5c827ce0 | 3223 | |
54d01ffb | 3224 | break; |
b9dfb167 | 3225 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3226 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3227 | case LTTNG_DOMAIN_PYTHON: |
2bdd86d4 | 3228 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3229 | { |
b51ec5b4 MD |
3230 | if (!ust_app_supported()) { |
3231 | ret = LTTNG_ERR_NO_UST; | |
3232 | goto error; | |
3233 | } | |
5c827ce0 DG |
3234 | /* Consumer is in an ERROR state. Report back to client */ |
3235 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3236 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3237 | goto error; |
3238 | } | |
3239 | ||
44d3bd01 | 3240 | if (need_tracing_session) { |
a4b92340 | 3241 | /* Create UST session if none exist. */ |
f6a9efaa | 3242 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3243 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3244 | &cmd_ctx->lsm->domain); |
f73fabfd | 3245 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
3246 | goto error; |
3247 | } | |
3248 | } | |
00e2e675 | 3249 | |
7753dea8 MD |
3250 | /* Start the UST consumer daemons */ |
3251 | /* 64-bit */ | |
3252 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3253 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3254 | ustconsumer64_data.pid == 0 && |
785d2d0d | 3255 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3256 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3257 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3258 | if (ret < 0) { |
f73fabfd | 3259 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 3260 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
3261 | goto error; |
3262 | } | |
48842b30 | 3263 | |
173af62f | 3264 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 3265 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 3266 | } else { |
7753dea8 MD |
3267 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3268 | } | |
173af62f DG |
3269 | |
3270 | /* | |
3271 | * Setup socket for consumer 64 bit. No need for atomic access | |
3272 | * since it was set above and can ONLY be set in this thread. | |
3273 | */ | |
a4b92340 DG |
3274 | ret = consumer_create_socket(&ustconsumer64_data, |
3275 | cmd_ctx->session->ust_session->consumer); | |
3276 | if (ret < 0) { | |
3277 | goto error; | |
173af62f DG |
3278 | } |
3279 | ||
7753dea8 | 3280 | /* 32-bit */ |
385b881b | 3281 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); |
fc7a59ce | 3282 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 3283 | ustconsumer32_data.pid == 0 && |
785d2d0d | 3284 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3285 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
3286 | ret = start_consumerd(&ustconsumer32_data); | |
3287 | if (ret < 0) { | |
f73fabfd | 3288 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 3289 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
3290 | goto error; |
3291 | } | |
5c827ce0 | 3292 | |
173af62f | 3293 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 3294 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
3295 | } else { |
3296 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3297 | } |
173af62f DG |
3298 | |
3299 | /* | |
3300 | * Setup socket for consumer 64 bit. No need for atomic access | |
3301 | * since it was set above and can ONLY be set in this thread. | |
3302 | */ | |
a4b92340 DG |
3303 | ret = consumer_create_socket(&ustconsumer32_data, |
3304 | cmd_ctx->session->ust_session->consumer); | |
3305 | if (ret < 0) { | |
3306 | goto error; | |
173af62f | 3307 | } |
44d3bd01 DG |
3308 | } |
3309 | break; | |
48842b30 | 3310 | } |
54d01ffb | 3311 | default: |
54d01ffb DG |
3312 | break; |
3313 | } | |
2e09ba09 | 3314 | skip_domain: |
33a2b854 | 3315 | |
5c827ce0 DG |
3316 | /* Validate consumer daemon state when start/stop trace command */ |
3317 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
3318 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
3319 | switch (cmd_ctx->lsm->domain.type) { | |
e7619875 JG |
3320 | case LTTNG_DOMAIN_NONE: |
3321 | break; | |
b9dfb167 | 3322 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3323 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3324 | case LTTNG_DOMAIN_PYTHON: |
5c827ce0 DG |
3325 | case LTTNG_DOMAIN_UST: |
3326 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3327 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3328 | goto error; |
3329 | } | |
3330 | break; | |
3331 | case LTTNG_DOMAIN_KERNEL: | |
3332 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3333 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3334 | goto error; |
3335 | } | |
3336 | break; | |
825535cc JG |
3337 | default: |
3338 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3339 | goto error; | |
5c827ce0 DG |
3340 | } |
3341 | } | |
3342 | ||
8e0af1b4 MD |
3343 | /* |
3344 | * Check that the UID or GID match that of the tracing session. | |
3345 | * The root user can interact with all sessions. | |
3346 | */ | |
3347 | if (need_tracing_session) { | |
3348 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
3349 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3350 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 3351 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
3352 | goto error; |
3353 | } | |
3354 | } | |
3355 | ||
ffe60014 DG |
3356 | /* |
3357 | * Send relayd information to consumer as soon as we have a domain and a | |
3358 | * session defined. | |
3359 | */ | |
3360 | if (cmd_ctx->session && need_domain) { | |
3361 | /* | |
3362 | * Setup relayd if not done yet. If the relayd information was already | |
3363 | * sent to the consumer, this call will gracefully return. | |
3364 | */ | |
3365 | ret = cmd_setup_relayd(cmd_ctx->session); | |
3366 | if (ret != LTTNG_OK) { | |
3367 | goto error; | |
3368 | } | |
3369 | } | |
3370 | ||
54d01ffb DG |
3371 | /* Process by command type */ |
3372 | switch (cmd_ctx->lsm->cmd_type) { | |
3373 | case LTTNG_ADD_CONTEXT: | |
3374 | { | |
2001793c JG |
3375 | /* |
3376 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
3377 | * payload if the context being added is an application context. | |
3378 | */ | |
3379 | if (cmd_ctx->lsm->u.context.ctx.ctx == | |
3380 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
3381 | char *provider_name = NULL, *context_name = NULL; | |
3382 | size_t provider_name_len = | |
3383 | cmd_ctx->lsm->u.context.provider_name_len; | |
3384 | size_t context_name_len = | |
3385 | cmd_ctx->lsm->u.context.context_name_len; | |
3386 | ||
3387 | if (provider_name_len == 0 || context_name_len == 0) { | |
3388 | /* | |
3389 | * Application provider and context names MUST | |
3390 | * be provided. | |
3391 | */ | |
3392 | ret = -LTTNG_ERR_INVALID; | |
3393 | goto error; | |
3394 | } | |
3395 | ||
3396 | provider_name = zmalloc(provider_name_len + 1); | |
3397 | if (!provider_name) { | |
3398 | ret = -LTTNG_ERR_NOMEM; | |
3399 | goto error; | |
3400 | } | |
e0f4d107 JG |
3401 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = |
3402 | provider_name; | |
2001793c JG |
3403 | |
3404 | context_name = zmalloc(context_name_len + 1); | |
3405 | if (!context_name) { | |
3406 | ret = -LTTNG_ERR_NOMEM; | |
3407 | goto error_add_context; | |
3408 | } | |
e0f4d107 JG |
3409 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = |
3410 | context_name; | |
2001793c JG |
3411 | |
3412 | ret = lttcomm_recv_unix_sock(sock, provider_name, | |
3413 | provider_name_len); | |
3414 | if (ret < 0) { | |
3415 | goto error_add_context; | |
3416 | } | |
3417 | ||
3418 | ret = lttcomm_recv_unix_sock(sock, context_name, | |
3419 | context_name_len); | |
3420 | if (ret < 0) { | |
3421 | goto error_add_context; | |
3422 | } | |
2001793c JG |
3423 | } |
3424 | ||
3425 | /* | |
3426 | * cmd_add_context assumes ownership of the provider and context | |
3427 | * names. | |
3428 | */ | |
3429 | ret = cmd_add_context(cmd_ctx->session, | |
3430 | cmd_ctx->lsm->domain.type, | |
54d01ffb | 3431 | cmd_ctx->lsm->u.context.channel_name, |
2001793c JG |
3432 | &cmd_ctx->lsm->u.context.ctx, |
3433 | kernel_poll_pipe[1]); | |
3434 | ||
3435 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL; | |
3436 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL; | |
3437 | error_add_context: | |
3438 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name); | |
3439 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name); | |
3440 | if (ret < 0) { | |
3441 | goto error; | |
3442 | } | |
54d01ffb DG |
3443 | break; |
3444 | } | |
3445 | case LTTNG_DISABLE_CHANNEL: | |
3446 | { | |
3447 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3448 | cmd_ctx->lsm->u.disable.channel_name); | |
3449 | break; | |
3450 | } | |
3451 | case LTTNG_DISABLE_EVENT: | |
3452 | { | |
47b7e2f9 JG |
3453 | |
3454 | /* | |
3455 | * FIXME: handle filter; for now we just receive the filter's | |
3456 | * bytecode along with the filter expression which are sent by | |
3457 | * liblttng-ctl and discard them. | |
3458 | * | |
3459 | * This fixes an issue where the client may block while sending | |
3460 | * the filter payload and encounter an error because the session | |
3461 | * daemon closes the socket without ever handling this data. | |
3462 | */ | |
3463 | size_t count = cmd_ctx->lsm->u.disable.expression_len + | |
3464 | cmd_ctx->lsm->u.disable.bytecode_len; | |
3465 | ||
3466 | if (count) { | |
3467 | char data[LTTNG_FILTER_MAX_LEN]; | |
3468 | ||
3469 | DBG("Discarding disable event command payload of size %zu", count); | |
3470 | while (count) { | |
3471 | ret = lttcomm_recv_unix_sock(sock, data, | |
3472 | count > sizeof(data) ? sizeof(data) : count); | |
3473 | if (ret < 0) { | |
3474 | goto error; | |
3475 | } | |
3476 | ||
3477 | count -= (size_t) ret; | |
3478 | } | |
3479 | } | |
6e911cad | 3480 | /* FIXME: passing packed structure to non-packed pointer */ |
54d01ffb DG |
3481 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3482 | cmd_ctx->lsm->u.disable.channel_name, | |
6e911cad | 3483 | &cmd_ctx->lsm->u.disable.event); |
33a2b854 DG |
3484 | break; |
3485 | } | |
54d01ffb DG |
3486 | case LTTNG_ENABLE_CHANNEL: |
3487 | { | |
7972aab2 | 3488 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
2f77fc4b | 3489 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
3490 | break; |
3491 | } | |
ccf10263 MD |
3492 | case LTTNG_TRACK_PID: |
3493 | { | |
3494 | ret = cmd_track_pid(cmd_ctx->session, | |
3495 | cmd_ctx->lsm->domain.type, | |
3496 | cmd_ctx->lsm->u.pid_tracker.pid); | |
3497 | break; | |
3498 | } | |
3499 | case LTTNG_UNTRACK_PID: | |
3500 | { | |
3501 | ret = cmd_untrack_pid(cmd_ctx->session, | |
3502 | cmd_ctx->lsm->domain.type, | |
3503 | cmd_ctx->lsm->u.pid_tracker.pid); | |
3504 | break; | |
3505 | } | |
54d01ffb DG |
3506 | case LTTNG_ENABLE_EVENT: |
3507 | { | |
882ef835 JI |
3508 | struct lttng_event_exclusion *exclusion = NULL; |
3509 | struct lttng_filter_bytecode *bytecode = NULL; | |
6b453b5e | 3510 | char *filter_expression = NULL; |
882ef835 | 3511 | |
67676bd8 DG |
3512 | /* Handle exclusion events and receive it from the client. */ |
3513 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { | |
3514 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; | |
3515 | ||
3516 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
3517 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
3518 | if (!exclusion) { | |
3519 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
3520 | goto error; | |
882ef835 | 3521 | } |
882ef835 | 3522 | |
67676bd8 DG |
3523 | DBG("Receiving var len exclusion event list from client ..."); |
3524 | exclusion->count = count; | |
3525 | ret = lttcomm_recv_unix_sock(sock, exclusion->names, | |
3526 | count * LTTNG_SYMBOL_NAME_LEN); | |
3527 | if (ret <= 0) { | |
3528 | DBG("Nothing recv() from client var len data... continuing"); | |
3529 | *sock_error = 1; | |
3530 | free(exclusion); | |
3531 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
3532 | goto error; | |
3533 | } | |
3534 | } | |
3535 | ||
6b453b5e JG |
3536 | /* Get filter expression from client. */ |
3537 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { | |
3538 | size_t expression_len = | |
3539 | cmd_ctx->lsm->u.enable.expression_len; | |
3540 | ||
3541 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
3542 | ret = LTTNG_ERR_FILTER_INVAL; | |
3543 | free(exclusion); | |
3544 | goto error; | |
3545 | } | |
3546 | ||
3547 | filter_expression = zmalloc(expression_len); | |
3548 | if (!filter_expression) { | |
3549 | free(exclusion); | |
3550 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3551 | goto error; | |
3552 | } | |
3553 | ||
3554 | /* Receive var. len. data */ | |
3555 | DBG("Receiving var len filter's expression from client ..."); | |
3556 | ret = lttcomm_recv_unix_sock(sock, filter_expression, | |
3557 | expression_len); | |
3558 | if (ret <= 0) { | |
3559 | DBG("Nothing recv() from client car len data... continuing"); | |
3560 | *sock_error = 1; | |
3561 | free(filter_expression); | |
3562 | free(exclusion); | |
3563 | ret = LTTNG_ERR_FILTER_INVAL; | |
3564 | goto error; | |
3565 | } | |
3566 | } | |
3567 | ||
67676bd8 DG |
3568 | /* Handle filter and get bytecode from client. */ |
3569 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { | |
3570 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; | |
3571 | ||
3572 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
3573 | ret = LTTNG_ERR_FILTER_INVAL; | |
49d21f93 | 3574 | free(filter_expression); |
67676bd8 DG |
3575 | free(exclusion); |
3576 | goto error; | |
3577 | } | |
3578 | ||
3579 | bytecode = zmalloc(bytecode_len); | |
3580 | if (!bytecode) { | |
49d21f93 | 3581 | free(filter_expression); |
67676bd8 DG |
3582 | free(exclusion); |
3583 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3584 | goto error; | |
882ef835 JI |
3585 | } |
3586 | ||
67676bd8 DG |
3587 | /* Receive var. len. data */ |
3588 | DBG("Receiving var len filter's bytecode from client ..."); | |
3589 | ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len); | |
3590 | if (ret <= 0) { | |
3591 | DBG("Nothing recv() from client car len data... continuing"); | |
3592 | *sock_error = 1; | |
49d21f93 | 3593 | free(filter_expression); |
67676bd8 DG |
3594 | free(bytecode); |
3595 | free(exclusion); | |
3596 | ret = LTTNG_ERR_FILTER_INVAL; | |
3597 | goto error; | |
3598 | } | |
3599 | ||
3600 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
49d21f93 | 3601 | free(filter_expression); |
67676bd8 DG |
3602 | free(bytecode); |
3603 | free(exclusion); | |
3604 | ret = LTTNG_ERR_FILTER_INVAL; | |
3605 | goto error; | |
3606 | } | |
882ef835 | 3607 | } |
67676bd8 DG |
3608 | |
3609 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, | |
3610 | cmd_ctx->lsm->u.enable.channel_name, | |
6b453b5e JG |
3611 | &cmd_ctx->lsm->u.enable.event, |
3612 | filter_expression, bytecode, exclusion, | |
67676bd8 | 3613 | kernel_poll_pipe[1]); |
54d01ffb DG |
3614 | break; |
3615 | } | |
052da939 | 3616 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3617 | { |
9f19cc17 | 3618 | struct lttng_event *events; |
54d01ffb | 3619 | ssize_t nb_events; |
052da939 | 3620 | |
0845bbfa | 3621 | session_lock_list(); |
54d01ffb | 3622 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
0845bbfa | 3623 | session_unlock_list(); |
54d01ffb | 3624 | if (nb_events < 0) { |
f73fabfd | 3625 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3626 | ret = -nb_events; |
3627 | goto error; | |
2ef84c95 DG |
3628 | } |
3629 | ||
3630 | /* | |
3631 | * Setup lttng message with payload size set to the event list size in | |
3632 | * bytes and then copy list into the llm payload. | |
3633 | */ | |
6e10c9b9 PP |
3634 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
3635 | sizeof(struct lttng_event) * nb_events); | |
3636 | free(events); | |
3637 | ||
2ef84c95 DG |
3638 | if (ret < 0) { |
3639 | goto setup_error; | |
3640 | } | |
3641 | ||
f73fabfd | 3642 | ret = LTTNG_OK; |
2ef84c95 DG |
3643 | break; |
3644 | } | |
f37d259d MD |
3645 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
3646 | { | |
3647 | struct lttng_event_field *fields; | |
3648 | ssize_t nb_fields; | |
3649 | ||
0845bbfa | 3650 | session_lock_list(); |
a4b92340 DG |
3651 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
3652 | &fields); | |
0845bbfa | 3653 | session_unlock_list(); |
f37d259d | 3654 | if (nb_fields < 0) { |
f73fabfd | 3655 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
3656 | ret = -nb_fields; |
3657 | goto error; | |
3658 | } | |
3659 | ||
3660 | /* | |
3661 | * Setup lttng message with payload size set to the event list size in | |
3662 | * bytes and then copy list into the llm payload. | |
3663 | */ | |
6e10c9b9 | 3664 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, |
a4b92340 | 3665 | sizeof(struct lttng_event_field) * nb_fields); |
6e10c9b9 PP |
3666 | free(fields); |
3667 | ||
f37d259d | 3668 | if (ret < 0) { |
f37d259d MD |
3669 | goto setup_error; |
3670 | } | |
3671 | ||
f73fabfd | 3672 | ret = LTTNG_OK; |
f37d259d MD |
3673 | break; |
3674 | } | |
834978fd DG |
3675 | case LTTNG_LIST_SYSCALLS: |
3676 | { | |
3677 | struct lttng_event *events; | |
3678 | ssize_t nb_events; | |
3679 | ||
3680 | nb_events = cmd_list_syscalls(&events); | |
3681 | if (nb_events < 0) { | |
3682 | /* Return value is a negative lttng_error_code. */ | |
3683 | ret = -nb_events; | |
3684 | goto error; | |
3685 | } | |
3686 | ||
3687 | /* | |
3688 | * Setup lttng message with payload size set to the event list size in | |
3689 | * bytes and then copy list into the llm payload. | |
3690 | */ | |
6e10c9b9 PP |
3691 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
3692 | sizeof(struct lttng_event) * nb_events); | |
3693 | free(events); | |
3694 | ||
834978fd | 3695 | if (ret < 0) { |
834978fd DG |
3696 | goto setup_error; |
3697 | } | |
3698 | ||
834978fd DG |
3699 | ret = LTTNG_OK; |
3700 | break; | |
3701 | } | |
a5dfbb9d MD |
3702 | case LTTNG_LIST_TRACKER_PIDS: |
3703 | { | |
3704 | int32_t *pids = NULL; | |
3705 | ssize_t nr_pids; | |
3706 | ||
3707 | nr_pids = cmd_list_tracker_pids(cmd_ctx->session, | |
3708 | cmd_ctx->lsm->domain.type, &pids); | |
3709 | if (nr_pids < 0) { | |
3710 | /* Return value is a negative lttng_error_code. */ | |
3711 | ret = -nr_pids; | |
3712 | goto error; | |
3713 | } | |
3714 | ||
3715 | /* | |
3716 | * Setup lttng message with payload size set to the event list size in | |
3717 | * bytes and then copy list into the llm payload. | |
3718 | */ | |
6e10c9b9 PP |
3719 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, pids, |
3720 | sizeof(int32_t) * nr_pids); | |
3721 | free(pids); | |
3722 | ||
a5dfbb9d | 3723 | if (ret < 0) { |
a5dfbb9d MD |
3724 | goto setup_error; |
3725 | } | |
3726 | ||
a5dfbb9d MD |
3727 | ret = LTTNG_OK; |
3728 | break; | |
3729 | } | |
00e2e675 DG |
3730 | case LTTNG_SET_CONSUMER_URI: |
3731 | { | |
a4b92340 DG |
3732 | size_t nb_uri, len; |
3733 | struct lttng_uri *uris; | |
3734 | ||
3735 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3736 | len = nb_uri * sizeof(struct lttng_uri); | |
3737 | ||
3738 | if (nb_uri == 0) { | |
f73fabfd | 3739 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
3740 | goto error; |
3741 | } | |
3742 | ||
3743 | uris = zmalloc(len); | |
3744 | if (uris == NULL) { | |
f73fabfd | 3745 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3746 | goto error; |
3747 | } | |
3748 | ||
3749 | /* Receive variable len data */ | |
77c7c900 | 3750 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
3751 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3752 | if (ret <= 0) { | |
3753 | DBG("No URIs received from client... continuing"); | |
3754 | *sock_error = 1; | |
f73fabfd | 3755 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3756 | free(uris); |
a4b92340 DG |
3757 | goto error; |
3758 | } | |
3759 | ||
bda32d56 JG |
3760 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); |
3761 | free(uris); | |
f73fabfd | 3762 | if (ret != LTTNG_OK) { |
a4b92340 DG |
3763 | goto error; |
3764 | } | |
3765 | ||
b1d41407 | 3766 | |
00e2e675 DG |
3767 | break; |
3768 | } | |
f3ed775e | 3769 | case LTTNG_START_TRACE: |
8c0faa1d | 3770 | { |
54d01ffb | 3771 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3772 | break; |
3773 | } | |
f3ed775e | 3774 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3775 | { |
54d01ffb | 3776 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3777 | break; |
3778 | } | |
5e16da05 MD |
3779 | case LTTNG_CREATE_SESSION: |
3780 | { | |
a4b92340 DG |
3781 | size_t nb_uri, len; |
3782 | struct lttng_uri *uris = NULL; | |
3783 | ||
3784 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3785 | len = nb_uri * sizeof(struct lttng_uri); | |
3786 | ||
3787 | if (nb_uri > 0) { | |
3788 | uris = zmalloc(len); | |
3789 | if (uris == NULL) { | |
f73fabfd | 3790 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3791 | goto error; |
3792 | } | |
3793 | ||
3794 | /* Receive variable len data */ | |
77c7c900 | 3795 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3796 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3797 | if (ret <= 0) { | |
3798 | DBG("No URIs received from client... continuing"); | |
3799 | *sock_error = 1; | |
f73fabfd | 3800 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3801 | free(uris); |
a4b92340 DG |
3802 | goto error; |
3803 | } | |
3804 | ||
3805 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3806 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3807 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3808 | free(uris); |
a4b92340 DG |
3809 | goto error; |
3810 | } | |
3811 | } | |
3812 | ||
3813 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
ecc48a90 | 3814 | &cmd_ctx->creds, 0); |
a4b92340 | 3815 | |
b1d41407 DG |
3816 | free(uris); |
3817 | ||
00e2e675 DG |
3818 | break; |
3819 | } | |
5e16da05 MD |
3820 | case LTTNG_DESTROY_SESSION: |
3821 | { | |
2f77fc4b | 3822 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
3823 | |
3824 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 3825 | cmd_ctx->session = NULL; |
5461b305 | 3826 | break; |
5e16da05 | 3827 | } |
9f19cc17 | 3828 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3829 | { |
54d01ffb | 3830 | ssize_t nb_dom; |
fa64dfb4 | 3831 | struct lttng_domain *domains = NULL; |
5461b305 | 3832 | |
54d01ffb DG |
3833 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3834 | if (nb_dom < 0) { | |
f73fabfd | 3835 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3836 | ret = -nb_dom; |
3837 | goto error; | |
ce3d728c | 3838 | } |
520ff687 | 3839 | |
6e10c9b9 PP |
3840 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, |
3841 | nb_dom * sizeof(struct lttng_domain)); | |
3842 | free(domains); | |
3843 | ||
5461b305 DG |
3844 | if (ret < 0) { |
3845 | goto setup_error; | |
520ff687 | 3846 | } |
57167058 | 3847 | |
f73fabfd | 3848 | ret = LTTNG_OK; |
5e16da05 MD |
3849 | break; |
3850 | } | |
9f19cc17 | 3851 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3852 | { |
53e367f9 | 3853 | ssize_t payload_size; |
ade7ce52 | 3854 | struct lttng_channel *channels = NULL; |
54d01ffb | 3855 | |
53e367f9 | 3856 | payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type, |
b551a063 | 3857 | cmd_ctx->session, &channels); |
53e367f9 | 3858 | if (payload_size < 0) { |
f73fabfd | 3859 | /* Return value is a negative lttng_error_code. */ |
53e367f9 | 3860 | ret = -payload_size; |
54d01ffb | 3861 | goto error; |
5461b305 | 3862 | } |
ca95a216 | 3863 | |
6e10c9b9 | 3864 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, |
53e367f9 | 3865 | payload_size); |
6e10c9b9 PP |
3866 | free(channels); |
3867 | ||
5461b305 DG |
3868 | if (ret < 0) { |
3869 | goto setup_error; | |
3870 | } | |
9f19cc17 | 3871 | |
f73fabfd | 3872 | ret = LTTNG_OK; |
5461b305 | 3873 | break; |
5e16da05 | 3874 | } |
9f19cc17 | 3875 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3876 | { |
b551a063 | 3877 | ssize_t nb_event; |
684d34d2 | 3878 | struct lttng_event *events = NULL; |
b4e3ceb9 PP |
3879 | struct lttcomm_event_command_header cmd_header; |
3880 | size_t total_size; | |
3881 | ||
b2d66287 | 3882 | memset(&cmd_header, 0, sizeof(cmd_header)); |
b4e3ceb9 PP |
3883 | /* Extended infos are included at the end of events */ |
3884 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, | |
3885 | cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name, | |
3886 | &events, &total_size); | |
9f19cc17 | 3887 | |
54d01ffb | 3888 | if (nb_event < 0) { |
f73fabfd | 3889 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3890 | ret = -nb_event; |
3891 | goto error; | |
5461b305 | 3892 | } |
ca95a216 | 3893 | |
b4e3ceb9 PP |
3894 | cmd_header.nb_events = nb_event; |
3895 | ret = setup_lttng_msg(cmd_ctx, events, total_size, | |
3896 | &cmd_header, sizeof(cmd_header)); | |
6e10c9b9 PP |
3897 | free(events); |
3898 | ||
5461b305 DG |
3899 | if (ret < 0) { |
3900 | goto setup_error; | |
3901 | } | |
9f19cc17 | 3902 | |
f73fabfd | 3903 | ret = LTTNG_OK; |
5461b305 | 3904 | break; |
5e16da05 MD |
3905 | } |
3906 | case LTTNG_LIST_SESSIONS: | |
3907 | { | |
8e0af1b4 | 3908 | unsigned int nr_sessions; |
6e10c9b9 PP |
3909 | void *sessions_payload; |
3910 | size_t payload_len; | |
5461b305 | 3911 | |
8e0af1b4 | 3912 | session_lock_list(); |
730389d9 DG |
3913 | nr_sessions = lttng_sessions_count( |
3914 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3915 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6e10c9b9 PP |
3916 | payload_len = sizeof(struct lttng_session) * nr_sessions; |
3917 | sessions_payload = zmalloc(payload_len); | |
d32fb093 | 3918 | |
6e10c9b9 | 3919 | if (!sessions_payload) { |
54d01ffb | 3920 | session_unlock_list(); |
6e10c9b9 | 3921 | ret = -ENOMEM; |
5461b305 | 3922 | goto setup_error; |
e065084a | 3923 | } |
5e16da05 | 3924 | |
6e10c9b9 | 3925 | cmd_list_lttng_sessions(sessions_payload, |
730389d9 DG |
3926 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3927 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
54d01ffb | 3928 | session_unlock_list(); |
5e16da05 | 3929 | |
6e10c9b9 PP |
3930 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, |
3931 | payload_len); | |
3932 | free(sessions_payload); | |
3933 | ||
3934 | if (ret < 0) { | |
3935 | goto setup_error; | |
3936 | } | |
3937 | ||
f73fabfd | 3938 | ret = LTTNG_OK; |
5e16da05 MD |
3939 | break; |
3940 | } | |
d9800920 DG |
3941 | case LTTNG_REGISTER_CONSUMER: |
3942 | { | |
2f77fc4b DG |
3943 | struct consumer_data *cdata; |
3944 | ||
3945 | switch (cmd_ctx->lsm->domain.type) { | |
3946 | case LTTNG_DOMAIN_KERNEL: | |
3947 | cdata = &kconsumer_data; | |
3948 | break; | |
3949 | default: | |
f73fabfd | 3950 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3951 | goto error; |
3952 | } | |
3953 | ||
54d01ffb | 3954 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 3955 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
3956 | break; |
3957 | } | |
6d805429 | 3958 | case LTTNG_DATA_PENDING: |
806e2684 | 3959 | { |
f6151c55 | 3960 | int pending_ret; |
6e10c9b9 | 3961 | uint8_t pending_ret_byte; |
f6151c55 JG |
3962 | |
3963 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
6e10c9b9 | 3964 | |
f6151c55 JG |
3965 | /* |
3966 | * FIXME | |
3967 | * | |
3968 | * This function may returns 0 or 1 to indicate whether or not | |
3969 | * there is data pending. In case of error, it should return an | |
3970 | * LTTNG_ERR code. However, some code paths may still return | |
3971 | * a nondescript error code, which we handle by returning an | |
3972 | * "unknown" error. | |
3973 | */ | |
3974 | if (pending_ret == 0 || pending_ret == 1) { | |
6e10c9b9 PP |
3975 | /* |
3976 | * ret will be set to LTTNG_OK at the end of | |
3977 | * this function. | |
3978 | */ | |
f6151c55 JG |
3979 | } else if (pending_ret < 0) { |
3980 | ret = LTTNG_ERR_UNK; | |
3981 | goto setup_error; | |
3982 | } else { | |
3983 | ret = pending_ret; | |
3984 | goto setup_error; | |
3985 | } | |
3986 | ||
6e10c9b9 PP |
3987 | pending_ret_byte = (uint8_t) pending_ret; |
3988 | ||
3989 | /* 1 byte to return whether or not data is pending */ | |
3990 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
3991 | &pending_ret_byte, 1); | |
3992 | ||
3993 | if (ret < 0) { | |
3994 | goto setup_error; | |
3995 | } | |
3996 | ||
3997 | ret = LTTNG_OK; | |
806e2684 DG |
3998 | break; |
3999 | } | |
da3c9ec1 DG |
4000 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
4001 | { | |
6dc3064a DG |
4002 | struct lttcomm_lttng_output_id reply; |
4003 | ||
4004 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
4005 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
4006 | if (ret != LTTNG_OK) { | |
4007 | goto error; | |
4008 | } | |
4009 | ||
6e10c9b9 PP |
4010 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, |
4011 | sizeof(reply)); | |
6dc3064a DG |
4012 | if (ret < 0) { |
4013 | goto setup_error; | |
4014 | } | |
4015 | ||
4016 | /* Copy output list into message payload */ | |
6dc3064a | 4017 | ret = LTTNG_OK; |
da3c9ec1 DG |
4018 | break; |
4019 | } | |
4020 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
4021 | { | |
6dc3064a DG |
4022 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
4023 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
4024 | break; |
4025 | } | |
4026 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
4027 | { | |
6dc3064a DG |
4028 | ssize_t nb_output; |
4029 | struct lttng_snapshot_output *outputs = NULL; | |
4030 | ||
4031 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
4032 | if (nb_output < 0) { | |
4033 | ret = -nb_output; | |
4034 | goto error; | |
4035 | } | |
4036 | ||
6e10c9b9 PP |
4037 | assert((nb_output > 0 && outputs) || nb_output == 0); |
4038 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
6dc3064a | 4039 | nb_output * sizeof(struct lttng_snapshot_output)); |
6e10c9b9 PP |
4040 | free(outputs); |
4041 | ||
6dc3064a | 4042 | if (ret < 0) { |
6dc3064a DG |
4043 | goto setup_error; |
4044 | } | |
4045 | ||
6dc3064a | 4046 | ret = LTTNG_OK; |
da3c9ec1 DG |
4047 | break; |
4048 | } | |
4049 | case LTTNG_SNAPSHOT_RECORD: | |
4050 | { | |
6dc3064a DG |
4051 | ret = cmd_snapshot_record(cmd_ctx->session, |
4052 | &cmd_ctx->lsm->u.snapshot_record.output, | |
4053 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
4054 | break; |
4055 | } | |
27babd3a DG |
4056 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
4057 | { | |
4058 | size_t nb_uri, len; | |
4059 | struct lttng_uri *uris = NULL; | |
4060 | ||
4061 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
4062 | len = nb_uri * sizeof(struct lttng_uri); | |
4063 | ||
4064 | if (nb_uri > 0) { | |
4065 | uris = zmalloc(len); | |
4066 | if (uris == NULL) { | |
4067 | ret = LTTNG_ERR_FATAL; | |
4068 | goto error; | |
4069 | } | |
4070 | ||
4071 | /* Receive variable len data */ | |
4072 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
4073 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
4074 | if (ret <= 0) { | |
4075 | DBG("No URIs received from client... continuing"); | |
4076 | *sock_error = 1; | |
4077 | ret = LTTNG_ERR_SESSION_FAIL; | |
4078 | free(uris); | |
4079 | goto error; | |
4080 | } | |
4081 | ||
4082 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
4083 | DBG("Creating session with ONE network URI is a bad call"); | |
4084 | ret = LTTNG_ERR_SESSION_FAIL; | |
4085 | free(uris); | |
4086 | goto error; | |
4087 | } | |
4088 | } | |
4089 | ||
4090 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
4091 | nb_uri, &cmd_ctx->creds); | |
4092 | free(uris); | |
4093 | break; | |
4094 | } | |
ecc48a90 JD |
4095 | case LTTNG_CREATE_SESSION_LIVE: |
4096 | { | |
4097 | size_t nb_uri, len; | |
4098 | struct lttng_uri *uris = NULL; | |
4099 | ||
4100 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
4101 | len = nb_uri * sizeof(struct lttng_uri); | |
4102 | ||
4103 | if (nb_uri > 0) { | |
4104 | uris = zmalloc(len); | |
4105 | if (uris == NULL) { | |
4106 | ret = LTTNG_ERR_FATAL; | |
4107 | goto error; | |
4108 | } | |
4109 | ||
4110 | /* Receive variable len data */ | |
4111 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
4112 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
4113 | if (ret <= 0) { | |
4114 | DBG("No URIs received from client... continuing"); | |
4115 | *sock_error = 1; | |
4116 | ret = LTTNG_ERR_SESSION_FAIL; | |
4117 | free(uris); | |
4118 | goto error; | |
4119 | } | |
4120 | ||
4121 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
4122 | DBG("Creating session with ONE network URI is a bad call"); | |
4123 | ret = LTTNG_ERR_SESSION_FAIL; | |
4124 | free(uris); | |
4125 | goto error; | |
4126 | } | |
4127 | } | |
4128 | ||
4129 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, | |
4130 | nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval); | |
4131 | free(uris); | |
4132 | break; | |
4133 | } | |
fb198a11 JG |
4134 | case LTTNG_SAVE_SESSION: |
4135 | { | |
4136 | ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr, | |
4137 | &cmd_ctx->creds); | |
4138 | break; | |
4139 | } | |
d7ba1388 MD |
4140 | case LTTNG_SET_SESSION_SHM_PATH: |
4141 | { | |
4142 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
4143 | cmd_ctx->lsm->u.set_shm_path.shm_path); | |
4144 | break; | |
4145 | } | |
eded6438 | 4146 | case LTTNG_REGENERATE_METADATA: |
93ec662e | 4147 | { |
eded6438 | 4148 | ret = cmd_regenerate_metadata(cmd_ctx->session); |
93ec662e JD |
4149 | break; |
4150 | } | |
c2561365 JD |
4151 | case LTTNG_REGENERATE_STATEDUMP: |
4152 | { | |
4153 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
4154 | break; | |
4155 | } | |
5e16da05 | 4156 | default: |
f73fabfd | 4157 | ret = LTTNG_ERR_UND; |
5461b305 | 4158 | break; |
fac6795d DG |
4159 | } |
4160 | ||
5461b305 | 4161 | error: |
5461b305 DG |
4162 | if (cmd_ctx->llm == NULL) { |
4163 | DBG("Missing llm structure. Allocating one."); | |
6e10c9b9 | 4164 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { |
5461b305 DG |
4165 | goto setup_error; |
4166 | } | |
4167 | } | |
54d01ffb | 4168 | /* Set return code */ |
5461b305 | 4169 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 4170 | setup_error: |
b5541356 | 4171 | if (cmd_ctx->session) { |
54d01ffb | 4172 | session_unlock(cmd_ctx->session); |
b5541356 | 4173 | } |
256a5576 MD |
4174 | if (need_tracing_session) { |
4175 | session_unlock_list(); | |
4176 | } | |
54d01ffb | 4177 | init_setup_error: |
3745d315 | 4178 | assert(!rcu_read_ongoing()); |
8028d920 | 4179 | return ret; |
fac6795d DG |
4180 | } |
4181 | ||
44a5e5eb DG |
4182 | /* |
4183 | * Thread managing health check socket. | |
4184 | */ | |
4185 | static void *thread_manage_health(void *data) | |
4186 | { | |
eb4a2943 | 4187 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
4188 | uint32_t revents, nb_fd; |
4189 | struct lttng_poll_event events; | |
0c89d795 MD |
4190 | struct health_comm_msg msg; |
4191 | struct health_comm_reply reply; | |
44a5e5eb DG |
4192 | |
4193 | DBG("[thread] Manage health check started"); | |
4194 | ||
4195 | rcu_register_thread(); | |
4196 | ||
6d737ce4 DG |
4197 | /* We might hit an error path before this is created. */ |
4198 | lttng_poll_init(&events); | |
3cc04881 | 4199 | |
44a5e5eb DG |
4200 | /* Create unix socket */ |
4201 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
4202 | if (sock < 0) { | |
4203 | ERR("Unable to create health check Unix socket"); | |
44a5e5eb DG |
4204 | goto error; |
4205 | } | |
4206 | ||
6c71277b MD |
4207 | if (is_root) { |
4208 | /* lttng health client socket path permissions */ | |
4209 | ret = chown(health_unix_sock_path, 0, | |
4210 | utils_get_group_id(tracing_group_name)); | |
4211 | if (ret < 0) { | |
4212 | ERR("Unable to set group on %s", health_unix_sock_path); | |
4213 | PERROR("chown"); | |
6c71277b MD |
4214 | goto error; |
4215 | } | |
4216 | ||
4217 | ret = chmod(health_unix_sock_path, | |
4218 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4219 | if (ret < 0) { | |
4220 | ERR("Unable to set permissions on %s", health_unix_sock_path); | |
4221 | PERROR("chmod"); | |
6c71277b MD |
4222 | goto error; |
4223 | } | |
4224 | } | |
4225 | ||
b662582b DG |
4226 | /* |
4227 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4228 | * show must go on. | |
4229 | */ | |
4230 | (void) utils_set_fd_cloexec(sock); | |
4231 | ||
44a5e5eb DG |
4232 | ret = lttcomm_listen_unix_sock(sock); |
4233 | if (ret < 0) { | |
4234 | goto error; | |
4235 | } | |
4236 | ||
4237 | /* | |
4238 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4239 | * more will be added to this poll set. | |
4240 | */ | |
d0b96690 | 4241 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
4242 | if (ret < 0) { |
4243 | goto error; | |
4244 | } | |
4245 | ||
4246 | /* Add the application registration socket */ | |
4247 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
4248 | if (ret < 0) { | |
4249 | goto error; | |
4250 | } | |
4251 | ||
ef367a93 | 4252 | sessiond_notify_ready(); |
97bc1426 | 4253 | |
44a5e5eb DG |
4254 | while (1) { |
4255 | DBG("Health check ready"); | |
4256 | ||
44a5e5eb DG |
4257 | /* Inifinite blocking call, waiting for transmission */ |
4258 | restart: | |
4259 | ret = lttng_poll_wait(&events, -1); | |
4260 | if (ret < 0) { | |
4261 | /* | |
4262 | * Restart interrupted system call. | |
4263 | */ | |
4264 | if (errno == EINTR) { | |
4265 | goto restart; | |
4266 | } | |
4267 | goto error; | |
4268 | } | |
4269 | ||
0d9c5d77 DG |
4270 | nb_fd = ret; |
4271 | ||
44a5e5eb DG |
4272 | for (i = 0; i < nb_fd; i++) { |
4273 | /* Fetch once the poll data */ | |
4274 | revents = LTTNG_POLL_GETEV(&events, i); | |
4275 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4276 | ||
fd20dac9 MD |
4277 | if (!revents) { |
4278 | /* No activity for this FD (poll implementation). */ | |
4279 | continue; | |
4280 | } | |
4281 | ||
44a5e5eb | 4282 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4283 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 4284 | if (ret) { |
139ac872 MD |
4285 | err = 0; |
4286 | goto exit; | |
44a5e5eb DG |
4287 | } |
4288 | ||
4289 | /* Event on the registration socket */ | |
4290 | if (pollfd == sock) { | |
03e43155 MD |
4291 | if (revents & LPOLLIN) { |
4292 | continue; | |
4293 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
44a5e5eb DG |
4294 | ERR("Health socket poll error"); |
4295 | goto error; | |
03e43155 MD |
4296 | } else { |
4297 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
4298 | goto error; | |
44a5e5eb DG |
4299 | } |
4300 | } | |
4301 | } | |
4302 | ||
4303 | new_sock = lttcomm_accept_unix_sock(sock); | |
4304 | if (new_sock < 0) { | |
4305 | goto error; | |
4306 | } | |
4307 | ||
b662582b DG |
4308 | /* |
4309 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4310 | * show must go on. | |
4311 | */ | |
4312 | (void) utils_set_fd_cloexec(new_sock); | |
4313 | ||
44a5e5eb DG |
4314 | DBG("Receiving data from client for health..."); |
4315 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
4316 | if (ret <= 0) { | |
4317 | DBG("Nothing recv() from client... continuing"); | |
4318 | ret = close(new_sock); | |
4319 | if (ret) { | |
4320 | PERROR("close"); | |
4321 | } | |
44a5e5eb DG |
4322 | continue; |
4323 | } | |
4324 | ||
4325 | rcu_thread_online(); | |
4326 | ||
53efb85a | 4327 | memset(&reply, 0, sizeof(reply)); |
6c71277b MD |
4328 | for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) { |
4329 | /* | |
4330 | * health_check_state returns 0 if health is | |
4331 | * bad. | |
4332 | */ | |
4333 | if (!health_check_state(health_sessiond, i)) { | |
4334 | reply.ret_code |= 1ULL << i; | |
4335 | } | |
44a5e5eb DG |
4336 | } |
4337 | ||
6c71277b | 4338 | DBG2("Health check return value %" PRIx64, reply.ret_code); |
44a5e5eb DG |
4339 | |
4340 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
4341 | if (ret < 0) { | |
4342 | ERR("Failed to send health data back to client"); | |
4343 | } | |
4344 | ||
4345 | /* End of transmission */ | |
4346 | ret = close(new_sock); | |
4347 | if (ret) { | |
4348 | PERROR("close"); | |
4349 | } | |
44a5e5eb DG |
4350 | } |
4351 | ||
139ac872 | 4352 | exit: |
44a5e5eb | 4353 | error: |
139ac872 MD |
4354 | if (err) { |
4355 | ERR("Health error occurred in %s", __func__); | |
4356 | } | |
44a5e5eb DG |
4357 | DBG("Health check thread dying"); |
4358 | unlink(health_unix_sock_path); | |
4359 | if (sock >= 0) { | |
4360 | ret = close(sock); | |
4361 | if (ret) { | |
4362 | PERROR("close"); | |
4363 | } | |
4364 | } | |
44a5e5eb DG |
4365 | |
4366 | lttng_poll_clean(&events); | |
28538a70 | 4367 | stop_threads(); |
44a5e5eb DG |
4368 | rcu_unregister_thread(); |
4369 | return NULL; | |
4370 | } | |
4371 | ||
1d4b027a | 4372 | /* |
d063d709 DG |
4373 | * This thread manage all clients request using the unix client socket for |
4374 | * communication. | |
1d4b027a DG |
4375 | */ |
4376 | static void *thread_manage_clients(void *data) | |
4377 | { | |
139ac872 | 4378 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 4379 | int sock_error; |
5eb91c98 | 4380 | uint32_t revents, nb_fd; |
273ea72c | 4381 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 4382 | struct lttng_poll_event events; |
1d4b027a DG |
4383 | |
4384 | DBG("[thread] Manage client started"); | |
4385 | ||
f6a9efaa DG |
4386 | rcu_register_thread(); |
4387 | ||
6c71277b | 4388 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
927ca06a | 4389 | |
840cb59c | 4390 | health_code_update(); |
44a5e5eb | 4391 | |
1d4b027a DG |
4392 | ret = lttcomm_listen_unix_sock(client_sock); |
4393 | if (ret < 0) { | |
35df2755 | 4394 | goto error_listen; |
1d4b027a DG |
4395 | } |
4396 | ||
5eb91c98 DG |
4397 | /* |
4398 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4399 | * more will be added to this poll set. | |
4400 | */ | |
d0b96690 | 4401 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 4402 | if (ret < 0) { |
35df2755 | 4403 | goto error_create_poll; |
5eb91c98 | 4404 | } |
273ea72c | 4405 | |
5eb91c98 DG |
4406 | /* Add the application registration socket */ |
4407 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
4408 | if (ret < 0) { | |
4409 | goto error; | |
4410 | } | |
273ea72c | 4411 | |
ef367a93 JG |
4412 | ret = sem_post(&load_info->message_thread_ready); |
4413 | if (ret) { | |
4414 | PERROR("sem_post message_thread_ready"); | |
4415 | goto error; | |
4416 | } | |
0bb7724a | 4417 | |
09a88287 JG |
4418 | /* |
4419 | * Wait until all support threads are initialized before accepting | |
4420 | * commands. | |
4421 | */ | |
4422 | while (uatomic_read(<tng_sessiond_ready) != 0) { | |
4423 | fd_set read_fds; | |
4424 | struct timeval timeout; | |
4425 | ||
4426 | FD_ZERO(&read_fds); | |
4427 | FD_SET(thread_quit_pipe[0], &read_fds); | |
4428 | memset(&timeout, 0, sizeof(timeout)); | |
4429 | timeout.tv_usec = 1000; | |
4430 | ||
4431 | /* | |
4432 | * If a support thread failed to launch, it may signal that | |
4433 | * we must exit and the sessiond would never be marked as | |
4434 | * "ready". | |
4435 | * | |
4436 | * The timeout is set to 1ms, which serves as a way to | |
4437 | * pace down this check. | |
4438 | */ | |
4439 | ret = select(thread_quit_pipe[0] + 1, &read_fds, NULL, NULL, | |
4440 | &timeout); | |
4441 | if (ret > 0 || (ret < 0 && errno != EINTR)) { | |
4442 | goto exit; | |
4443 | } | |
4444 | } | |
70a71a41 JG |
4445 | /* |
4446 | * This barrier is paired with the one in sessiond_notify_ready() to | |
4447 | * ensure that loads accessing data initialized by the other threads, | |
4448 | * on which this thread was waiting, are not performed before this point. | |
4449 | * | |
4450 | * Note that this could be a 'read' memory barrier, but a full barrier | |
4451 | * is used in case the code changes. The performance implications of | |
4452 | * this choice are minimal since this is a slow path. | |
4453 | */ | |
4454 | cmm_smp_mb(); | |
09a88287 | 4455 | |
72453c8c MD |
4456 | /* This testpoint is after we signal readiness to the parent. */ |
4457 | if (testpoint(sessiond_thread_manage_clients)) { | |
4458 | goto error; | |
4459 | } | |
4460 | ||
e547b070 | 4461 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { |
6993eeb3 CB |
4462 | goto error; |
4463 | } | |
8ac94142 | 4464 | |
840cb59c | 4465 | health_code_update(); |
44a5e5eb | 4466 | |
1d4b027a | 4467 | while (1) { |
1d4b027a | 4468 | DBG("Accepting client command ..."); |
273ea72c DG |
4469 | |
4470 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 4471 | restart: |
a78af745 | 4472 | health_poll_entry(); |
5eb91c98 | 4473 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 4474 | health_poll_exit(); |
273ea72c | 4475 | if (ret < 0) { |
88f2b785 MD |
4476 | /* |
4477 | * Restart interrupted system call. | |
4478 | */ | |
4479 | if (errno == EINTR) { | |
4480 | goto restart; | |
4481 | } | |
273ea72c DG |
4482 | goto error; |
4483 | } | |
4484 | ||
0d9c5d77 DG |
4485 | nb_fd = ret; |
4486 | ||
5eb91c98 DG |
4487 | for (i = 0; i < nb_fd; i++) { |
4488 | /* Fetch once the poll data */ | |
4489 | revents = LTTNG_POLL_GETEV(&events, i); | |
4490 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4491 | ||
840cb59c | 4492 | health_code_update(); |
44a5e5eb | 4493 | |
fd20dac9 MD |
4494 | if (!revents) { |
4495 | /* No activity for this FD (poll implementation). */ | |
4496 | continue; | |
4497 | } | |
4498 | ||
5eb91c98 | 4499 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4500 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 4501 | if (ret) { |
139ac872 MD |
4502 | err = 0; |
4503 | goto exit; | |
5eb91c98 DG |
4504 | } |
4505 | ||
4506 | /* Event on the registration socket */ | |
4507 | if (pollfd == client_sock) { | |
03e43155 MD |
4508 | if (revents & LPOLLIN) { |
4509 | continue; | |
4510 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
5eb91c98 DG |
4511 | ERR("Client socket poll error"); |
4512 | goto error; | |
03e43155 MD |
4513 | } else { |
4514 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
4515 | goto error; | |
5eb91c98 DG |
4516 | } |
4517 | } | |
4518 | } | |
4519 | ||
4520 | DBG("Wait for client response"); | |
4521 | ||
840cb59c | 4522 | health_code_update(); |
44a5e5eb | 4523 | |
5eb91c98 DG |
4524 | sock = lttcomm_accept_unix_sock(client_sock); |
4525 | if (sock < 0) { | |
273ea72c | 4526 | goto error; |
273ea72c DG |
4527 | } |
4528 | ||
b662582b DG |
4529 | /* |
4530 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4531 | * show must go on. | |
4532 | */ | |
4533 | (void) utils_set_fd_cloexec(sock); | |
4534 | ||
be040666 DG |
4535 | /* Set socket option for credentials retrieval */ |
4536 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
4537 | if (ret < 0) { | |
4538 | goto error; | |
4539 | } | |
4540 | ||
5eb91c98 | 4541 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 4542 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 4543 | if (cmd_ctx == NULL) { |
76d7553f | 4544 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 4545 | goto error; |
5eb91c98 | 4546 | } |
1d4b027a | 4547 | |
5eb91c98 | 4548 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 4549 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 4550 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 4551 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
4552 | goto error; |
4553 | } | |
1d4b027a | 4554 | |
5eb91c98 DG |
4555 | cmd_ctx->llm = NULL; |
4556 | cmd_ctx->session = NULL; | |
1d4b027a | 4557 | |
840cb59c | 4558 | health_code_update(); |
44a5e5eb | 4559 | |
5eb91c98 DG |
4560 | /* |
4561 | * Data is received from the lttng client. The struct | |
4562 | * lttcomm_session_msg (lsm) contains the command and data request of | |
4563 | * the client. | |
4564 | */ | |
4565 | DBG("Receiving data from client ..."); | |
be040666 DG |
4566 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
4567 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
4568 | if (ret <= 0) { |
4569 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
4570 | ret = close(sock); |
4571 | if (ret) { | |
4572 | PERROR("close"); | |
4573 | } | |
4574 | sock = -1; | |
a2c0da86 | 4575 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4576 | continue; |
4577 | } | |
1d4b027a | 4578 | |
840cb59c | 4579 | health_code_update(); |
44a5e5eb | 4580 | |
5eb91c98 DG |
4581 | // TODO: Validate cmd_ctx including sanity check for |
4582 | // security purpose. | |
f7776ea7 | 4583 | |
f6a9efaa | 4584 | rcu_thread_online(); |
5eb91c98 DG |
4585 | /* |
4586 | * This function dispatch the work to the kernel or userspace tracer | |
4587 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
4588 | * informations for the client. The command context struct contains | |
4589 | * everything this function may needs. | |
4590 | */ | |
53a80697 | 4591 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 4592 | rcu_thread_offline(); |
5eb91c98 | 4593 | if (ret < 0) { |
36134aa1 DG |
4594 | ret = close(sock); |
4595 | if (ret) { | |
4596 | PERROR("close"); | |
53a80697 | 4597 | } |
36134aa1 | 4598 | sock = -1; |
bbd973c2 | 4599 | /* |
5eb91c98 | 4600 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 4601 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
4602 | * (ENOMEM). Error detected but still accept |
4603 | * command, unless a socket error has been | |
4604 | * detected. | |
bbd973c2 | 4605 | */ |
bbd973c2 | 4606 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4607 | continue; |
4608 | } | |
d6e4fca4 | 4609 | |
840cb59c | 4610 | health_code_update(); |
44a5e5eb | 4611 | |
a1ac8b97 | 4612 | DBG("Sending response (size: %d, retcode: %s (%d))", |
54d01ffb | 4613 | cmd_ctx->lttng_msg_size, |
a1ac8b97 JG |
4614 | lttng_strerror(-cmd_ctx->llm->ret_code), |
4615 | cmd_ctx->llm->ret_code); | |
54d01ffb | 4616 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
4617 | if (ret < 0) { |
4618 | ERR("Failed to send data back to client"); | |
bbd973c2 | 4619 | } |
1d4b027a | 4620 | |
5eb91c98 | 4621 | /* End of transmission */ |
76d7553f MD |
4622 | ret = close(sock); |
4623 | if (ret) { | |
4624 | PERROR("close"); | |
4625 | } | |
4626 | sock = -1; | |
be040666 DG |
4627 | |
4628 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 4629 | |
840cb59c | 4630 | health_code_update(); |
273ea72c DG |
4631 | } |
4632 | ||
139ac872 | 4633 | exit: |
5eb91c98 | 4634 | error: |
35df2755 CB |
4635 | if (sock >= 0) { |
4636 | ret = close(sock); | |
4637 | if (ret) { | |
4638 | PERROR("close"); | |
4639 | } | |
139ac872 | 4640 | } |
44a5e5eb | 4641 | |
35df2755 CB |
4642 | lttng_poll_clean(&events); |
4643 | clean_command_ctx(&cmd_ctx); | |
4644 | ||
4645 | error_listen: | |
4646 | error_create_poll: | |
273ea72c | 4647 | unlink(client_unix_sock_path); |
76d7553f MD |
4648 | if (client_sock >= 0) { |
4649 | ret = close(client_sock); | |
4650 | if (ret) { | |
4651 | PERROR("close"); | |
4652 | } | |
a4b35e07 | 4653 | } |
35df2755 CB |
4654 | |
4655 | if (err) { | |
840cb59c | 4656 | health_error(); |
35df2755 | 4657 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 4658 | } |
273ea72c | 4659 | |
8782cc74 | 4660 | health_unregister(health_sessiond); |
35df2755 CB |
4661 | |
4662 | DBG("Client thread dying"); | |
f6a9efaa DG |
4663 | |
4664 | rcu_unregister_thread(); | |
4a15001e MD |
4665 | |
4666 | /* | |
4667 | * Since we are creating the consumer threads, we own them, so we need | |
4668 | * to join them before our thread exits. | |
4669 | */ | |
4670 | ret = join_consumer_thread(&kconsumer_data); | |
4671 | if (ret) { | |
4672 | errno = ret; | |
4673 | PERROR("join_consumer"); | |
4674 | } | |
4675 | ||
4676 | ret = join_consumer_thread(&ustconsumer32_data); | |
4677 | if (ret) { | |
4678 | errno = ret; | |
4679 | PERROR("join_consumer ust32"); | |
4680 | } | |
4681 | ||
4682 | ret = join_consumer_thread(&ustconsumer64_data); | |
4683 | if (ret) { | |
4684 | errno = ret; | |
4685 | PERROR("join_consumer ust64"); | |
4686 | } | |
1d4b027a DG |
4687 | return NULL; |
4688 | } | |
4689 | ||
c0232ea5 JG |
4690 | static int string_match(const char *str1, const char *str2) |
4691 | { | |
4692 | return (str1 && str2) && !strcmp(str1, str2); | |
4693 | } | |
4694 | ||
fac6795d | 4695 | /* |
26296c48 JG |
4696 | * Take an option from the getopt output and set it in the right variable to be |
4697 | * used later. | |
4698 | * | |
4699 | * Return 0 on success else a negative value. | |
fac6795d | 4700 | */ |
26296c48 | 4701 | static int set_option(int opt, const char *arg, const char *optname) |
fac6795d | 4702 | { |
26296c48 | 4703 | int ret = 0; |
fac6795d | 4704 | |
c0232ea5 | 4705 | if (string_match(optname, "client-sock") || opt == 'c') { |
66b2ce8e JG |
4706 | if (!arg || *arg == '\0') { |
4707 | ret = -EINVAL; | |
4708 | goto end; | |
4709 | } | |
e8fa9fb0 MD |
4710 | if (lttng_is_setuid_setgid()) { |
4711 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4712 | "-c, --client-sock"); | |
4713 | } else { | |
4714 | snprintf(client_unix_sock_path, PATH_MAX, "%s", arg); | |
4715 | } | |
c0232ea5 | 4716 | } else if (string_match(optname, "apps-sock") || opt == 'a') { |
66b2ce8e JG |
4717 | if (!arg || *arg == '\0') { |
4718 | ret = -EINVAL; | |
4719 | goto end; | |
4720 | } | |
e8fa9fb0 MD |
4721 | if (lttng_is_setuid_setgid()) { |
4722 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4723 | "-a, --apps-sock"); | |
4724 | } else { | |
4725 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", arg); | |
4726 | } | |
c0232ea5 | 4727 | } else if (string_match(optname, "daemonize") || opt == 'd') { |
26296c48 | 4728 | opt_daemon = 1; |
c0232ea5 | 4729 | } else if (string_match(optname, "background") || opt == 'b') { |
72dd7491 | 4730 | opt_background = 1; |
c0232ea5 | 4731 | } else if (string_match(optname, "group") || opt == 'g') { |
66b2ce8e JG |
4732 | if (!arg || *arg == '\0') { |
4733 | ret = -EINVAL; | |
4734 | goto end; | |
4735 | } | |
e8fa9fb0 MD |
4736 | if (lttng_is_setuid_setgid()) { |
4737 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4738 | "-g, --group"); | |
4739 | } else { | |
4740 | /* | |
4741 | * If the override option is set, the pointer points to a | |
4742 | * *non* const thus freeing it even though the variable type is | |
4743 | * set to const. | |
4744 | */ | |
4745 | if (tracing_group_name_override) { | |
4746 | free((void *) tracing_group_name); | |
4747 | } | |
4748 | tracing_group_name = strdup(arg); | |
4749 | if (!tracing_group_name) { | |
4750 | PERROR("strdup"); | |
4751 | ret = -ENOMEM; | |
4752 | } | |
4753 | tracing_group_name_override = 1; | |
db322c4d | 4754 | } |
c0232ea5 | 4755 | } else if (string_match(optname, "help") || opt == 'h') { |
8190767e PP |
4756 | ret = utils_show_man_page(8, "lttng-sessiond"); |
4757 | if (ret) { | |
4758 | ERR("Cannot view man page lttng-sessiond(8)"); | |
4759 | perror("exec"); | |
4760 | } | |
4761 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); | |
c0232ea5 | 4762 | } else if (string_match(optname, "version") || opt == 'V') { |
26296c48 JG |
4763 | fprintf(stdout, "%s\n", VERSION); |
4764 | exit(EXIT_SUCCESS); | |
c0232ea5 | 4765 | } else if (string_match(optname, "sig-parent") || opt == 'S') { |
26296c48 | 4766 | opt_sig_parent = 1; |
c0232ea5 | 4767 | } else if (string_match(optname, "kconsumerd-err-sock")) { |
66b2ce8e JG |
4768 | if (!arg || *arg == '\0') { |
4769 | ret = -EINVAL; | |
4770 | goto end; | |
4771 | } | |
e8fa9fb0 MD |
4772 | if (lttng_is_setuid_setgid()) { |
4773 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4774 | "--kconsumerd-err-sock"); | |
4775 | } else { | |
4776 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4777 | } | |
c0232ea5 | 4778 | } else if (string_match(optname, "kconsumerd-cmd-sock")) { |
66b2ce8e JG |
4779 | if (!arg || *arg == '\0') { |
4780 | ret = -EINVAL; | |
4781 | goto end; | |
4782 | } | |
e8fa9fb0 MD |
4783 | if (lttng_is_setuid_setgid()) { |
4784 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4785 | "--kconsumerd-cmd-sock"); | |
4786 | } else { | |
4787 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4788 | } | |
c0232ea5 | 4789 | } else if (string_match(optname, "ustconsumerd64-err-sock")) { |
66b2ce8e JG |
4790 | if (!arg || *arg == '\0') { |
4791 | ret = -EINVAL; | |
4792 | goto end; | |
4793 | } | |
e8fa9fb0 MD |
4794 | if (lttng_is_setuid_setgid()) { |
4795 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4796 | "--ustconsumerd64-err-sock"); | |
4797 | } else { | |
4798 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4799 | } | |
c0232ea5 | 4800 | } else if (string_match(optname, "ustconsumerd64-cmd-sock")) { |
66b2ce8e JG |
4801 | if (!arg || *arg == '\0') { |
4802 | ret = -EINVAL; | |
4803 | goto end; | |
4804 | } | |
e8fa9fb0 MD |
4805 | if (lttng_is_setuid_setgid()) { |
4806 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4807 | "--ustconsumerd64-cmd-sock"); | |
4808 | } else { | |
4809 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4810 | } | |
c0232ea5 | 4811 | } else if (string_match(optname, "ustconsumerd32-err-sock")) { |
66b2ce8e JG |
4812 | if (!arg || *arg == '\0') { |
4813 | ret = -EINVAL; | |
4814 | goto end; | |
4815 | } | |
e8fa9fb0 MD |
4816 | if (lttng_is_setuid_setgid()) { |
4817 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4818 | "--ustconsumerd32-err-sock"); | |
4819 | } else { | |
4820 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4821 | } | |
c0232ea5 | 4822 | } else if (string_match(optname, "ustconsumerd32-cmd-sock")) { |
66b2ce8e JG |
4823 | if (!arg || *arg == '\0') { |
4824 | ret = -EINVAL; | |
4825 | goto end; | |
4826 | } | |
e8fa9fb0 MD |
4827 | if (lttng_is_setuid_setgid()) { |
4828 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4829 | "--ustconsumerd32-cmd-sock"); | |
4830 | } else { | |
4831 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4832 | } | |
c0232ea5 | 4833 | } else if (string_match(optname, "no-kernel")) { |
26296c48 | 4834 | opt_no_kernel = 1; |
c0232ea5 | 4835 | } else if (string_match(optname, "quiet") || opt == 'q') { |
26296c48 | 4836 | lttng_opt_quiet = 1; |
c0232ea5 | 4837 | } else if (string_match(optname, "verbose") || opt == 'v') { |
26296c48 JG |
4838 | /* Verbose level can increase using multiple -v */ |
4839 | if (arg) { | |
13755a18 | 4840 | /* Value obtained from config file */ |
26296c48 JG |
4841 | lttng_opt_verbose = config_parse_value(arg); |
4842 | } else { | |
13755a18 JG |
4843 | /* -v used on command line */ |
4844 | lttng_opt_verbose++; | |
26296c48 | 4845 | } |
13755a18 JG |
4846 | /* Clamp value to [0, 3] */ |
4847 | lttng_opt_verbose = lttng_opt_verbose < 0 ? 0 : | |
4848 | (lttng_opt_verbose <= 3 ? lttng_opt_verbose : 3); | |
c0232ea5 | 4849 | } else if (string_match(optname, "verbose-consumer")) { |
26296c48 JG |
4850 | if (arg) { |
4851 | opt_verbose_consumer = config_parse_value(arg); | |
4852 | } else { | |
ca939de8 | 4853 | opt_verbose_consumer++; |
26296c48 | 4854 | } |
c0232ea5 | 4855 | } else if (string_match(optname, "consumerd32-path")) { |
66b2ce8e JG |
4856 | if (!arg || *arg == '\0') { |
4857 | ret = -EINVAL; | |
4858 | goto end; | |
4859 | } | |
e8fa9fb0 MD |
4860 | if (lttng_is_setuid_setgid()) { |
4861 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4862 | "--consumerd32-path"); | |
4863 | } else { | |
4864 | if (consumerd32_bin_override) { | |
4865 | free((void *) consumerd32_bin); | |
4866 | } | |
4867 | consumerd32_bin = strdup(arg); | |
4868 | if (!consumerd32_bin) { | |
4869 | PERROR("strdup"); | |
4870 | ret = -ENOMEM; | |
4871 | } | |
4872 | consumerd32_bin_override = 1; | |
db322c4d | 4873 | } |
c0232ea5 | 4874 | } else if (string_match(optname, "consumerd32-libdir")) { |
66b2ce8e JG |
4875 | if (!arg || *arg == '\0') { |
4876 | ret = -EINVAL; | |
4877 | goto end; | |
4878 | } | |
e8fa9fb0 MD |
4879 | if (lttng_is_setuid_setgid()) { |
4880 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4881 | "--consumerd32-libdir"); | |
4882 | } else { | |
4883 | if (consumerd32_libdir_override) { | |
4884 | free((void *) consumerd32_libdir); | |
4885 | } | |
4886 | consumerd32_libdir = strdup(arg); | |
4887 | if (!consumerd32_libdir) { | |
4888 | PERROR("strdup"); | |
4889 | ret = -ENOMEM; | |
4890 | } | |
4891 | consumerd32_libdir_override = 1; | |
db322c4d | 4892 | } |
c0232ea5 | 4893 | } else if (string_match(optname, "consumerd64-path")) { |
66b2ce8e JG |
4894 | if (!arg || *arg == '\0') { |
4895 | ret = -EINVAL; | |
4896 | goto end; | |
4897 | } | |
e8fa9fb0 MD |
4898 | if (lttng_is_setuid_setgid()) { |
4899 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4900 | "--consumerd64-path"); | |
4901 | } else { | |
4902 | if (consumerd64_bin_override) { | |
4903 | free((void *) consumerd64_bin); | |
4904 | } | |
4905 | consumerd64_bin = strdup(arg); | |
4906 | if (!consumerd64_bin) { | |
4907 | PERROR("strdup"); | |
4908 | ret = -ENOMEM; | |
4909 | } | |
4910 | consumerd64_bin_override = 1; | |
db322c4d | 4911 | } |
c0232ea5 | 4912 | } else if (string_match(optname, "consumerd64-libdir")) { |
66b2ce8e JG |
4913 | if (!arg || *arg == '\0') { |
4914 | ret = -EINVAL; | |
4915 | goto end; | |
4916 | } | |
e8fa9fb0 MD |
4917 | if (lttng_is_setuid_setgid()) { |
4918 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4919 | "--consumerd64-libdir"); | |
4920 | } else { | |
4921 | if (consumerd64_libdir_override) { | |
4922 | free((void *) consumerd64_libdir); | |
4923 | } | |
4924 | consumerd64_libdir = strdup(arg); | |
4925 | if (!consumerd64_libdir) { | |
4926 | PERROR("strdup"); | |
4927 | ret = -ENOMEM; | |
4928 | } | |
4929 | consumerd64_libdir_override = 1; | |
db322c4d | 4930 | } |
c0232ea5 | 4931 | } else if (string_match(optname, "pidfile") || opt == 'p') { |
66b2ce8e JG |
4932 | if (!arg || *arg == '\0') { |
4933 | ret = -EINVAL; | |
4934 | goto end; | |
4935 | } | |
e8fa9fb0 MD |
4936 | if (lttng_is_setuid_setgid()) { |
4937 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4938 | "-p, --pidfile"); | |
4939 | } else { | |
4940 | free(opt_pidfile); | |
4941 | opt_pidfile = strdup(arg); | |
4942 | if (!opt_pidfile) { | |
4943 | PERROR("strdup"); | |
4944 | ret = -ENOMEM; | |
4945 | } | |
db322c4d | 4946 | } |
c0232ea5 | 4947 | } else if (string_match(optname, "agent-tcp-port")) { |
66b2ce8e JG |
4948 | if (!arg || *arg == '\0') { |
4949 | ret = -EINVAL; | |
4950 | goto end; | |
4951 | } | |
e8fa9fb0 MD |
4952 | if (lttng_is_setuid_setgid()) { |
4953 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4954 | "--agent-tcp-port"); | |
4955 | } else { | |
4956 | unsigned long v; | |
4d076222 | 4957 | |
e8fa9fb0 MD |
4958 | errno = 0; |
4959 | v = strtoul(arg, NULL, 0); | |
4960 | if (errno != 0 || !isdigit(arg[0])) { | |
4961 | ERR("Wrong value in --agent-tcp-port parameter: %s", arg); | |
4962 | return -1; | |
4963 | } | |
4964 | if (v == 0 || v >= 65535) { | |
4965 | ERR("Port overflow in --agent-tcp-port parameter: %s", arg); | |
4966 | return -1; | |
4967 | } | |
4968 | agent_tcp_port = (uint32_t) v; | |
4969 | DBG3("Agent TCP port set to non default: %u", agent_tcp_port); | |
26296c48 | 4970 | } |
c0232ea5 | 4971 | } else if (string_match(optname, "load") || opt == 'l') { |
66b2ce8e JG |
4972 | if (!arg || *arg == '\0') { |
4973 | ret = -EINVAL; | |
4974 | goto end; | |
4975 | } | |
e8fa9fb0 MD |
4976 | if (lttng_is_setuid_setgid()) { |
4977 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4978 | "-l, --load"); | |
4979 | } else { | |
4980 | free(opt_load_session_path); | |
aacbfa47 | 4981 | opt_load_session_path = utils_expand_path(arg); |
e8fa9fb0 | 4982 | if (!opt_load_session_path) { |
aacbfa47 JG |
4983 | ERR("Failed to expand load path %s", arg); |
4984 | ret = -EINVAL; | |
e8fa9fb0 | 4985 | } |
ef367a93 | 4986 | } |
c0232ea5 | 4987 | } else if (string_match(optname, "kmod-probes")) { |
66b2ce8e JG |
4988 | if (!arg || *arg == '\0') { |
4989 | ret = -EINVAL; | |
4990 | goto end; | |
4991 | } | |
e8fa9fb0 MD |
4992 | if (lttng_is_setuid_setgid()) { |
4993 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4994 | "--kmod-probes"); | |
4995 | } else { | |
4996 | free(kmod_probes_list); | |
4997 | kmod_probes_list = strdup(arg); | |
4998 | if (!kmod_probes_list) { | |
4999 | PERROR("strdup"); | |
5000 | ret = -ENOMEM; | |
5001 | } | |
c9d42407 | 5002 | } |
c0232ea5 | 5003 | } else if (string_match(optname, "extra-kmod-probes")) { |
66b2ce8e JG |
5004 | if (!arg || *arg == '\0') { |
5005 | ret = -EINVAL; | |
5006 | goto end; | |
5007 | } | |
e8fa9fb0 MD |
5008 | if (lttng_is_setuid_setgid()) { |
5009 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5010 | "--extra-kmod-probes"); | |
5011 | } else { | |
5012 | free(kmod_extra_probes_list); | |
5013 | kmod_extra_probes_list = strdup(arg); | |
5014 | if (!kmod_extra_probes_list) { | |
5015 | PERROR("strdup"); | |
5016 | ret = -ENOMEM; | |
5017 | } | |
db322c4d | 5018 | } |
c0232ea5 JG |
5019 | } else if (string_match(optname, "config") || opt == 'f') { |
5020 | /* This is handled in set_options() thus silent skip. */ | |
5021 | goto end; | |
5022 | } else { | |
26296c48 JG |
5023 | /* Unknown option or other error. |
5024 | * Error is printed by getopt, just return */ | |
5025 | ret = -1; | |
5026 | } | |
5027 | ||
f3dd7ce7 | 5028 | end: |
c5d350b2 JG |
5029 | if (ret == -EINVAL) { |
5030 | const char *opt_name = "unknown"; | |
5031 | int i; | |
5032 | ||
5033 | for (i = 0; i < sizeof(long_options) / sizeof(struct option); | |
5034 | i++) { | |
5035 | if (opt == long_options[i].val) { | |
5036 | opt_name = long_options[i].name; | |
5037 | break; | |
5038 | } | |
5039 | } | |
5040 | ||
5041 | WARN("Invalid argument provided for option \"%s\", using default value.", | |
5042 | opt_name); | |
5043 | } | |
f3dd7ce7 | 5044 | |
26296c48 JG |
5045 | return ret; |
5046 | } | |
5047 | ||
5048 | /* | |
5049 | * config_entry_handler_cb used to handle options read from a config file. | |
f40ef1d5 | 5050 | * See config_entry_handler_cb comment in common/config/session-config.h for the |
26296c48 JG |
5051 | * return value conventions. |
5052 | */ | |
5053 | static int config_entry_handler(const struct config_entry *entry, void *unused) | |
5054 | { | |
5055 | int ret = 0, i; | |
5056 | ||
5057 | if (!entry || !entry->name || !entry->value) { | |
5058 | ret = -EINVAL; | |
5059 | goto end; | |
5060 | } | |
5061 | ||
5062 | /* Check if the option is to be ignored */ | |
5063 | for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) { | |
5064 | if (!strcmp(entry->name, config_ignore_options[i])) { | |
5065 | goto end; | |
5066 | } | |
5067 | } | |
5068 | ||
5069 | for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; | |
5070 | i++) { | |
5071 | ||
5072 | /* Ignore if not fully matched. */ | |
5073 | if (strcmp(entry->name, long_options[i].name)) { | |
5074 | continue; | |
5075 | } | |
5076 | ||
5077 | /* | |
5078 | * If the option takes no argument on the command line, we have to | |
5079 | * check if the value is "true". We support non-zero numeric values, | |
5080 | * true, on and yes. | |
5081 | */ | |
5082 | if (!long_options[i].has_arg) { | |
5083 | ret = config_parse_value(entry->value); | |
5084 | if (ret <= 0) { | |
5085 | if (ret) { | |
5086 | WARN("Invalid configuration value \"%s\" for option %s", | |
5087 | entry->value, entry->name); | |
5088 | } | |
5089 | /* False, skip boolean config option. */ | |
5090 | goto end; | |
4d076222 | 5091 | } |
26296c48 JG |
5092 | } |
5093 | ||
5094 | ret = set_option(long_options[i].val, entry->value, entry->name); | |
5095 | goto end; | |
5096 | } | |
5097 | ||
5098 | WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name); | |
5099 | ||
5100 | end: | |
5101 | return ret; | |
5102 | } | |
5103 | ||
5104 | /* | |
5105 | * daemon configuration loading and argument parsing | |
5106 | */ | |
5107 | static int set_options(int argc, char **argv) | |
5108 | { | |
5109 | int ret = 0, c = 0, option_index = 0; | |
5110 | int orig_optopt = optopt, orig_optind = optind; | |
5111 | char *optstring; | |
5112 | const char *config_path = NULL; | |
5113 | ||
5114 | optstring = utils_generate_optstring(long_options, | |
5115 | sizeof(long_options) / sizeof(struct option)); | |
5116 | if (!optstring) { | |
5117 | ret = -ENOMEM; | |
5118 | goto end; | |
5119 | } | |
5120 | ||
5121 | /* Check for the --config option */ | |
5122 | while ((c = getopt_long(argc, argv, optstring, long_options, | |
5123 | &option_index)) != -1) { | |
5124 | if (c == '?') { | |
5125 | ret = -EINVAL; | |
5126 | goto end; | |
5127 | } else if (c != 'f') { | |
5128 | /* if not equal to --config option. */ | |
5129 | continue; | |
5130 | } | |
5131 | ||
e8fa9fb0 MD |
5132 | if (lttng_is_setuid_setgid()) { |
5133 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5134 | "-f, --config"); | |
5135 | } else { | |
5136 | config_path = utils_expand_path(optarg); | |
5137 | if (!config_path) { | |
5138 | ERR("Failed to resolve path: %s", optarg); | |
5139 | } | |
26296c48 JG |
5140 | } |
5141 | } | |
5142 | ||
5143 | ret = config_get_section_entries(config_path, config_section_name, | |
5144 | config_entry_handler, NULL); | |
5145 | if (ret) { | |
5146 | if (ret > 0) { | |
5147 | ERR("Invalid configuration option at line %i", ret); | |
5148 | ret = -1; | |
5149 | } | |
5150 | goto end; | |
5151 | } | |
5152 | ||
5153 | /* Reset getopt's global state */ | |
5154 | optopt = orig_optopt; | |
5155 | optind = orig_optind; | |
5156 | while (1) { | |
c0232ea5 JG |
5157 | option_index = -1; |
5158 | /* | |
5159 | * getopt_long() will not set option_index if it encounters a | |
5160 | * short option. | |
5161 | */ | |
5162 | c = getopt_long(argc, argv, optstring, long_options, | |
5163 | &option_index); | |
26296c48 | 5164 | if (c == -1) { |
4d076222 DG |
5165 | break; |
5166 | } | |
26296c48 | 5167 | |
c0232ea5 JG |
5168 | /* |
5169 | * Pass NULL as the long option name if popt left the index | |
5170 | * unset. | |
5171 | */ | |
5172 | ret = set_option(c, optarg, | |
5173 | option_index < 0 ? NULL : | |
5174 | long_options[option_index].name); | |
26296c48 JG |
5175 | if (ret < 0) { |
5176 | break; | |
fac6795d DG |
5177 | } |
5178 | } | |
5179 | ||
26296c48 JG |
5180 | end: |
5181 | free(optstring); | |
5182 | return ret; | |
fac6795d DG |
5183 | } |
5184 | ||
5185 | /* | |
d063d709 | 5186 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
5187 | * apps_sock - The communication socket for all UST apps. |
5188 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 5189 | */ |
cf3af59e | 5190 | static int init_daemon_socket(void) |
fac6795d DG |
5191 | { |
5192 | int ret = 0; | |
5193 | mode_t old_umask; | |
5194 | ||
5195 | old_umask = umask(0); | |
5196 | ||
5197 | /* Create client tool unix socket */ | |
d6f42150 DG |
5198 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
5199 | if (client_sock < 0) { | |
5200 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
5201 | ret = -1; |
5202 | goto end; | |
5203 | } | |
5204 | ||
b662582b DG |
5205 | /* Set the cloexec flag */ |
5206 | ret = utils_set_fd_cloexec(client_sock); | |
5207 | if (ret < 0) { | |
5208 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
5209 | "Continuing but note that the consumer daemon will have a " | |
5210 | "reference to this socket on exec()", client_sock); | |
5211 | } | |
5212 | ||
fac6795d DG |
5213 | /* File permission MUST be 660 */ |
5214 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
5215 | if (ret < 0) { | |
d6f42150 | 5216 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 5217 | PERROR("chmod"); |
fac6795d DG |
5218 | goto end; |
5219 | } | |
5220 | ||
5221 | /* Create the application unix socket */ | |
d6f42150 DG |
5222 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
5223 | if (apps_sock < 0) { | |
5224 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
5225 | ret = -1; |
5226 | goto end; | |
5227 | } | |
5228 | ||
b662582b DG |
5229 | /* Set the cloexec flag */ |
5230 | ret = utils_set_fd_cloexec(apps_sock); | |
5231 | if (ret < 0) { | |
5232 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
5233 | "Continuing but note that the consumer daemon will have a " | |
5234 | "reference to this socket on exec()", apps_sock); | |
5235 | } | |
5236 | ||
d6f42150 | 5237 | /* File permission MUST be 666 */ |
54d01ffb DG |
5238 | ret = chmod(apps_unix_sock_path, |
5239 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 5240 | if (ret < 0) { |
d6f42150 | 5241 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 5242 | PERROR("chmod"); |
fac6795d DG |
5243 | goto end; |
5244 | } | |
5245 | ||
b662582b DG |
5246 | DBG3("Session daemon client socket %d and application socket %d created", |
5247 | client_sock, apps_sock); | |
5248 | ||
fac6795d DG |
5249 | end: |
5250 | umask(old_umask); | |
5251 | return ret; | |
5252 | } | |
5253 | ||
5254 | /* | |
54d01ffb DG |
5255 | * Check if the global socket is available, and if a daemon is answering at the |
5256 | * other side. If yes, error is returned. | |
fac6795d | 5257 | */ |
cf3af59e | 5258 | static int check_existing_daemon(void) |
fac6795d | 5259 | { |
7d8234d9 | 5260 | /* Is there anybody out there ? */ |
099e26bd | 5261 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 5262 | return -EEXIST; |
099e26bd | 5263 | } |
b09c7c76 DG |
5264 | |
5265 | return 0; | |
fac6795d DG |
5266 | } |
5267 | ||
fac6795d | 5268 | /* |
d063d709 | 5269 | * Set the tracing group gid onto the client socket. |
5e16da05 | 5270 | * |
d063d709 | 5271 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 5272 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 5273 | */ |
be040666 | 5274 | static int set_permissions(char *rundir) |
fac6795d DG |
5275 | { |
5276 | int ret; | |
996b65c8 | 5277 | gid_t gid; |
fac6795d | 5278 | |
6c71277b | 5279 | gid = utils_get_group_id(tracing_group_name); |
fac6795d | 5280 | |
d6f42150 | 5281 | /* Set lttng run dir */ |
be040666 | 5282 | ret = chown(rundir, 0, gid); |
d6f42150 | 5283 | if (ret < 0) { |
be040666 | 5284 | ERR("Unable to set group on %s", rundir); |
76d7553f | 5285 | PERROR("chown"); |
d6f42150 DG |
5286 | } |
5287 | ||
6c71277b MD |
5288 | /* |
5289 | * Ensure all applications and tracing group can search the run | |
5290 | * dir. Allow everyone to read the directory, since it does not | |
5291 | * buy us anything to hide its content. | |
5292 | */ | |
5293 | ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
d1613cf5 JN |
5294 | if (ret < 0) { |
5295 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 5296 | PERROR("chmod"); |
d1613cf5 JN |
5297 | } |
5298 | ||
d6f42150 | 5299 | /* lttng client socket path */ |
996b65c8 | 5300 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 5301 | if (ret < 0) { |
d6f42150 | 5302 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 5303 | PERROR("chown"); |
d6f42150 DG |
5304 | } |
5305 | ||
3bd1e081 | 5306 | /* kconsumer error socket path */ |
6c71277b | 5307 | ret = chown(kconsumer_data.err_unix_sock_path, 0, 0); |
d6f42150 | 5308 | if (ret < 0) { |
3bd1e081 | 5309 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 5310 | PERROR("chown"); |
3bd1e081 MD |
5311 | } |
5312 | ||
7753dea8 | 5313 | /* 64-bit ustconsumer error socket path */ |
6c71277b | 5314 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0); |
7753dea8 MD |
5315 | if (ret < 0) { |
5316 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 5317 | PERROR("chown"); |
7753dea8 MD |
5318 | } |
5319 | ||
5320 | /* 32-bit ustconsumer compat32 error socket path */ | |
6c71277b | 5321 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0); |
3bd1e081 | 5322 | if (ret < 0) { |
7753dea8 | 5323 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 5324 | PERROR("chown"); |
fac6795d DG |
5325 | } |
5326 | ||
d6f42150 | 5327 | DBG("All permissions are set"); |
e07ae692 | 5328 | |
fac6795d DG |
5329 | return ret; |
5330 | } | |
5331 | ||
d6f42150 | 5332 | /* |
d063d709 | 5333 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 5334 | */ |
67e40797 | 5335 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
5336 | { |
5337 | int ret; | |
5338 | ||
67e40797 DG |
5339 | DBG3("Creating LTTng run directory: %s", rundir); |
5340 | ||
d1613cf5 | 5341 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 5342 | if (ret < 0) { |
b1f11e69 | 5343 | if (errno != EEXIST) { |
67e40797 | 5344 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
5345 | goto error; |
5346 | } else { | |
5347 | ret = 0; | |
5348 | } | |
d6f42150 DG |
5349 | } |
5350 | ||
5351 | error: | |
5352 | return ret; | |
5353 | } | |
5354 | ||
5355 | /* | |
d063d709 DG |
5356 | * Setup sockets and directory needed by the kconsumerd communication with the |
5357 | * session daemon. | |
d6f42150 | 5358 | */ |
67e40797 DG |
5359 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
5360 | const char *rundir) | |
d6f42150 DG |
5361 | { |
5362 | int ret; | |
67e40797 | 5363 | char path[PATH_MAX]; |
d6f42150 | 5364 | |
6c71277b | 5365 | switch (consumer_data->type) { |
7753dea8 | 5366 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 5367 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
5368 | break; |
5369 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 5370 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
5371 | break; |
5372 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 5373 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
5374 | break; |
5375 | default: | |
5376 | ERR("Consumer type unknown"); | |
5377 | ret = -EINVAL; | |
5378 | goto error; | |
d6f42150 DG |
5379 | } |
5380 | ||
67e40797 DG |
5381 | DBG2("Creating consumer directory: %s", path); |
5382 | ||
6c71277b | 5383 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP); |
d6f42150 | 5384 | if (ret < 0) { |
6beb2242 | 5385 | if (errno != EEXIST) { |
f11e84c2 | 5386 | PERROR("mkdir"); |
3bd1e081 | 5387 | ERR("Failed to create %s", path); |
6beb2242 DG |
5388 | goto error; |
5389 | } | |
f11e84c2 | 5390 | ret = -1; |
d6f42150 | 5391 | } |
6c71277b MD |
5392 | if (is_root) { |
5393 | ret = chown(path, 0, utils_get_group_id(tracing_group_name)); | |
5394 | if (ret < 0) { | |
5395 | ERR("Unable to set group on %s", path); | |
5396 | PERROR("chown"); | |
5397 | goto error; | |
5398 | } | |
5399 | } | |
d6f42150 DG |
5400 | |
5401 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
5402 | consumer_data->err_sock = |
5403 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
5404 | if (consumer_data->err_sock < 0) { | |
5405 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
5406 | ret = -1; |
5407 | goto error; | |
5408 | } | |
5409 | ||
a24f05ab MD |
5410 | /* |
5411 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
5412 | * show must go on. | |
5413 | */ | |
5414 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
5415 | if (ret < 0) { | |
5416 | PERROR("utils_set_fd_cloexec"); | |
5417 | /* continue anyway */ | |
5418 | } | |
5419 | ||
d6f42150 | 5420 | /* File permission MUST be 660 */ |
3bd1e081 | 5421 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 5422 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 5423 | if (ret < 0) { |
3bd1e081 | 5424 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 5425 | PERROR("chmod"); |
d6f42150 DG |
5426 | goto error; |
5427 | } | |
5428 | ||
5429 | error: | |
5430 | return ret; | |
5431 | } | |
5432 | ||
fac6795d | 5433 | /* |
d063d709 | 5434 | * Signal handler for the daemon |
cf3af59e | 5435 | * |
54d01ffb DG |
5436 | * Simply stop all worker threads, leaving main() return gracefully after |
5437 | * joining all threads and calling cleanup(). | |
fac6795d DG |
5438 | */ |
5439 | static void sighandler(int sig) | |
5440 | { | |
5441 | switch (sig) { | |
cf3af59e | 5442 | case SIGINT: |
af87c45a | 5443 | DBG("SIGINT caught"); |
cf3af59e MD |
5444 | stop_threads(); |
5445 | break; | |
5446 | case SIGTERM: | |
af87c45a | 5447 | DBG("SIGTERM caught"); |
cf3af59e MD |
5448 | stop_threads(); |
5449 | break; | |
0bb7724a DG |
5450 | case SIGUSR1: |
5451 | CMM_STORE_SHARED(recv_child_signal, 1); | |
5452 | break; | |
cf3af59e MD |
5453 | default: |
5454 | break; | |
fac6795d | 5455 | } |
fac6795d DG |
5456 | } |
5457 | ||
5458 | /* | |
d063d709 | 5459 | * Setup signal handler for : |
1d4b027a | 5460 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 5461 | */ |
1d4b027a | 5462 | static int set_signal_handler(void) |
fac6795d | 5463 | { |
1d4b027a DG |
5464 | int ret = 0; |
5465 | struct sigaction sa; | |
5466 | sigset_t sigset; | |
fac6795d | 5467 | |
1d4b027a | 5468 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 5469 | PERROR("sigemptyset"); |
1d4b027a DG |
5470 | return ret; |
5471 | } | |
d6f42150 | 5472 | |
1d4b027a DG |
5473 | sa.sa_mask = sigset; |
5474 | sa.sa_flags = 0; | |
0072e5e2 MD |
5475 | |
5476 | sa.sa_handler = sighandler; | |
1d4b027a | 5477 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
76d7553f | 5478 | PERROR("sigaction"); |
1d4b027a | 5479 | return ret; |
d6f42150 DG |
5480 | } |
5481 | ||
1d4b027a | 5482 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 5483 | PERROR("sigaction"); |
1d4b027a | 5484 | return ret; |
d6f42150 | 5485 | } |
aaf26714 | 5486 | |
0072e5e2 | 5487 | if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) { |
76d7553f | 5488 | PERROR("sigaction"); |
1d4b027a | 5489 | return ret; |
8c0faa1d DG |
5490 | } |
5491 | ||
0072e5e2 MD |
5492 | sa.sa_handler = SIG_IGN; |
5493 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
0bb7724a DG |
5494 | PERROR("sigaction"); |
5495 | return ret; | |
5496 | } | |
5497 | ||
5498 | DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT"); | |
1d4b027a DG |
5499 | |
5500 | return ret; | |
fac6795d DG |
5501 | } |
5502 | ||
f3ed775e | 5503 | /* |
d063d709 | 5504 | * Set open files limit to unlimited. This daemon can open a large number of |
514bb9f0 | 5505 | * file descriptors in order to consume multiple kernel traces. |
f3ed775e DG |
5506 | */ |
5507 | static void set_ulimit(void) | |
5508 | { | |
5509 | int ret; | |
5510 | struct rlimit lim; | |
5511 | ||
514bb9f0 | 5512 | /* The kernel does not allow an infinite limit for open files */ |
f3ed775e DG |
5513 | lim.rlim_cur = 65535; |
5514 | lim.rlim_max = 65535; | |
5515 | ||
5516 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
5517 | if (ret < 0) { | |
76d7553f | 5518 | PERROR("failed to set open files limit"); |
f3ed775e DG |
5519 | } |
5520 | } | |
5521 | ||
35f90c40 DG |
5522 | /* |
5523 | * Write pidfile using the rundir and opt_pidfile. | |
5524 | */ | |
4a15001e | 5525 | static int write_pidfile(void) |
35f90c40 DG |
5526 | { |
5527 | int ret; | |
5528 | char pidfile_path[PATH_MAX]; | |
5529 | ||
5530 | assert(rundir); | |
5531 | ||
5532 | if (opt_pidfile) { | |
b8d76705 MD |
5533 | if (lttng_strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path))) { |
5534 | ret = -1; | |
5535 | goto error; | |
5536 | } | |
35f90c40 DG |
5537 | } else { |
5538 | /* Build pidfile path from rundir and opt_pidfile. */ | |
5539 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
5540 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
5541 | if (ret < 0) { | |
5542 | PERROR("snprintf pidfile path"); | |
5543 | goto error; | |
5544 | } | |
5545 | } | |
5546 | ||
5547 | /* | |
4a15001e | 5548 | * Create pid file in rundir. |
35f90c40 | 5549 | */ |
4a15001e | 5550 | ret = utils_create_pid_file(getpid(), pidfile_path); |
35f90c40 | 5551 | error: |
4a15001e | 5552 | return ret; |
35f90c40 DG |
5553 | } |
5554 | ||
c9cb3e7d JG |
5555 | /* |
5556 | * Create lockfile using the rundir and return its fd. | |
5557 | */ | |
5558 | static int create_lockfile(void) | |
5559 | { | |
5560 | int ret; | |
5561 | char lockfile_path[PATH_MAX]; | |
5562 | ||
5563 | ret = generate_lock_file_path(lockfile_path, sizeof(lockfile_path)); | |
5564 | if (ret < 0) { | |
5565 | goto error; | |
5566 | } | |
5567 | ||
5568 | ret = utils_create_lock_file(lockfile_path); | |
5569 | error: | |
5570 | return ret; | |
5571 | } | |
5572 | ||
cd9290dd | 5573 | /* |
022d91ba | 5574 | * Write agent TCP port using the rundir. |
cd9290dd | 5575 | */ |
4a15001e | 5576 | static int write_agent_port(void) |
cd9290dd DG |
5577 | { |
5578 | int ret; | |
5579 | char path[PATH_MAX]; | |
5580 | ||
5581 | assert(rundir); | |
5582 | ||
5583 | ret = snprintf(path, sizeof(path), "%s/" | |
022d91ba | 5584 | DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE, rundir); |
cd9290dd | 5585 | if (ret < 0) { |
022d91ba | 5586 | PERROR("snprintf agent port path"); |
cd9290dd DG |
5587 | goto error; |
5588 | } | |
5589 | ||
5590 | /* | |
4a15001e | 5591 | * Create TCP agent port file in rundir. |
cd9290dd | 5592 | */ |
4a15001e | 5593 | ret = utils_create_pid_file(agent_tcp_port, path); |
cd9290dd DG |
5594 | |
5595 | error: | |
4a15001e | 5596 | return ret; |
ef367a93 JG |
5597 | } |
5598 | ||
51c59105 JG |
5599 | static int set_clock_plugin_env(void) |
5600 | { | |
5601 | int ret = 0; | |
5602 | const char *original_env_value; | |
5603 | char *full_path = NULL; | |
5604 | char *new_env_value = NULL; | |
5605 | ||
5606 | original_env_value = getenv("LTTNG_UST_CLOCK_PLUGIN"); | |
5607 | if (!original_env_value) { | |
5608 | goto end; | |
5609 | } | |
5610 | ||
5611 | full_path = utils_expand_path(original_env_value); | |
5612 | if (!full_path) { | |
5613 | ERR("Failed to expand LTTNG_UST_CLOCK_PLUGIN path \"%s\"", | |
5614 | original_env_value); | |
5615 | ret = -1; | |
5616 | goto end; | |
5617 | } | |
5618 | ret = asprintf(&new_env_value, "LTTNG_UST_CLOCK_PLUGIN=%s", | |
5619 | full_path); | |
5620 | free(full_path); | |
5621 | if (ret < 0) { | |
5622 | PERROR("asprintf"); | |
5623 | goto end; | |
5624 | } | |
5625 | ||
5626 | DBG("Updating environment: %s", new_env_value); | |
5627 | ret = putenv(new_env_value); | |
5628 | if (ret) { | |
5629 | free(new_env_value); | |
5630 | PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN"); | |
5631 | goto end; | |
5632 | } | |
5633 | end: | |
5634 | return ret; | |
5635 | } | |
5636 | ||
fac6795d DG |
5637 | /* |
5638 | * main | |
5639 | */ | |
5640 | int main(int argc, char **argv) | |
5641 | { | |
4a15001e | 5642 | int ret = 0, retval = 0; |
fac6795d | 5643 | void *status; |
ae9e45b3 | 5644 | const char *home_path, *env_app_timeout; |
fac6795d | 5645 | |
335a95b7 MD |
5646 | init_kernel_workarounds(); |
5647 | ||
f6a9efaa DG |
5648 | rcu_register_thread(); |
5649 | ||
4a15001e MD |
5650 | if (set_signal_handler()) { |
5651 | retval = -1; | |
5652 | goto exit_set_signal_handler; | |
0bb7724a DG |
5653 | } |
5654 | ||
7753dea8 | 5655 | setup_consumerd_path(); |
fb09408a | 5656 | |
12744796 DG |
5657 | page_size = sysconf(_SC_PAGESIZE); |
5658 | if (page_size < 0) { | |
5659 | PERROR("sysconf _SC_PAGESIZE"); | |
5660 | page_size = LONG_MAX; | |
5661 | WARN("Fallback page size to %ld", page_size); | |
5662 | } | |
5663 | ||
4a15001e MD |
5664 | /* |
5665 | * Parse arguments and load the daemon configuration file. | |
5666 | * | |
5667 | * We have an exit_options exit path to free memory reserved by | |
5668 | * set_options. This is needed because the rest of sessiond_cleanup() | |
5669 | * depends on ht_cleanup_thread, which depends on lttng_daemonize, which | |
5670 | * depends on set_options. | |
5671 | */ | |
fac6795d | 5672 | progname = argv[0]; |
4a15001e MD |
5673 | if (set_options(argc, argv)) { |
5674 | retval = -1; | |
5675 | goto exit_options; | |
fac6795d DG |
5676 | } |
5677 | ||
51c59105 JG |
5678 | ret = set_clock_plugin_env(); |
5679 | if (ret) { | |
5680 | retval = -1; | |
5681 | goto exit_options; | |
5682 | } | |
5683 | ||
fac6795d | 5684 | /* Daemonize */ |
72dd7491 | 5685 | if (opt_daemon || opt_background) { |
ceed52b5 MD |
5686 | int i; |
5687 | ||
72dd7491 MD |
5688 | ret = lttng_daemonize(&child_ppid, &recv_child_signal, |
5689 | !opt_background); | |
53094c05 | 5690 | if (ret < 0) { |
4a15001e MD |
5691 | retval = -1; |
5692 | goto exit_options; | |
53094c05 | 5693 | } |
0bb7724a | 5694 | |
ceed52b5 | 5695 | /* |
0bb7724a | 5696 | * We are in the child. Make sure all other file descriptors are |
4a15001e MD |
5697 | * closed, in case we are called with more opened file |
5698 | * descriptors than the standard ones. | |
ceed52b5 MD |
5699 | */ |
5700 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
5701 | (void) close(i); | |
5702 | } | |
5703 | } | |
5704 | ||
7567352f MD |
5705 | if (run_as_create_worker(argv[0]) < 0) { |
5706 | goto exit_create_run_as_worker_cleanup; | |
5707 | } | |
5708 | ||
4a15001e MD |
5709 | /* |
5710 | * Starting from here, we can create threads. This needs to be after | |
5711 | * lttng_daemonize due to RCU. | |
5712 | */ | |
5713 | ||
5714 | /* | |
5715 | * Initialize the health check subsystem. This call should set the | |
5716 | * appropriate time values. | |
5717 | */ | |
5718 | health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES); | |
5719 | if (!health_sessiond) { | |
5720 | PERROR("health_app_create error"); | |
5721 | retval = -1; | |
5722 | goto exit_health_sessiond_cleanup; | |
5723 | } | |
5724 | ||
4a15001e | 5725 | /* Create thread to clean up RCU hash tables */ |
5e97de00 | 5726 | if (init_ht_cleanup_thread(&ht_cleanup_thread)) { |
4a15001e MD |
5727 | retval = -1; |
5728 | goto exit_ht_cleanup; | |
5729 | } | |
5730 | ||
ceed52b5 | 5731 | /* Create thread quit pipe */ |
4a15001e MD |
5732 | if (init_thread_quit_pipe()) { |
5733 | retval = -1; | |
5734 | goto exit_init_data; | |
fac6795d DG |
5735 | } |
5736 | ||
5737 | /* Check if daemon is UID = 0 */ | |
5738 | is_root = !getuid(); | |
5739 | ||
fac6795d | 5740 | if (is_root) { |
990570ed | 5741 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
4ea184d1 | 5742 | if (!rundir) { |
4a15001e MD |
5743 | retval = -1; |
5744 | goto exit_init_data; | |
4ea184d1 | 5745 | } |
67e40797 DG |
5746 | |
5747 | /* Create global run dir with root access */ | |
4a15001e MD |
5748 | if (create_lttng_rundir(rundir)) { |
5749 | retval = -1; | |
5750 | goto exit_init_data; | |
d6f42150 DG |
5751 | } |
5752 | ||
fac6795d | 5753 | if (strlen(apps_unix_sock_path) == 0) { |
4a15001e | 5754 | ret = snprintf(apps_unix_sock_path, PATH_MAX, |
d6f42150 | 5755 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); |
4a15001e MD |
5756 | if (ret < 0) { |
5757 | retval = -1; | |
5758 | goto exit_init_data; | |
5759 | } | |
fac6795d DG |
5760 | } |
5761 | ||
5762 | if (strlen(client_unix_sock_path) == 0) { | |
4a15001e | 5763 | ret = snprintf(client_unix_sock_path, PATH_MAX, |
d6f42150 | 5764 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); |
4a15001e MD |
5765 | if (ret < 0) { |
5766 | retval = -1; | |
5767 | goto exit_init_data; | |
5768 | } | |
d6f42150 | 5769 | } |
0fdd1e2c DG |
5770 | |
5771 | /* Set global SHM for ust */ | |
5772 | if (strlen(wait_shm_path) == 0) { | |
4a15001e | 5773 | ret = snprintf(wait_shm_path, PATH_MAX, |
0fdd1e2c | 5774 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); |
4a15001e MD |
5775 | if (ret < 0) { |
5776 | retval = -1; | |
5777 | goto exit_init_data; | |
5778 | } | |
0fdd1e2c | 5779 | } |
67e40797 | 5780 | |
44a5e5eb | 5781 | if (strlen(health_unix_sock_path) == 0) { |
4a15001e MD |
5782 | ret = snprintf(health_unix_sock_path, |
5783 | sizeof(health_unix_sock_path), | |
44a5e5eb | 5784 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); |
4a15001e MD |
5785 | if (ret < 0) { |
5786 | retval = -1; | |
5787 | goto exit_init_data; | |
5788 | } | |
44a5e5eb DG |
5789 | } |
5790 | ||
67e40797 | 5791 | /* Setup kernel consumerd path */ |
4a15001e | 5792 | ret = snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, |
60922cb0 | 5793 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
4a15001e MD |
5794 | if (ret < 0) { |
5795 | retval = -1; | |
5796 | goto exit_init_data; | |
5797 | } | |
5798 | ret = snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, | |
60922cb0 | 5799 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
4a15001e MD |
5800 | if (ret < 0) { |
5801 | retval = -1; | |
5802 | goto exit_init_data; | |
5803 | } | |
67e40797 DG |
5804 | |
5805 | DBG2("Kernel consumer err path: %s", | |
5806 | kconsumer_data.err_unix_sock_path); | |
5807 | DBG2("Kernel consumer cmd path: %s", | |
5808 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 5809 | } else { |
feb0f3e5 | 5810 | home_path = utils_get_home_dir(); |
b082db07 | 5811 | if (home_path == NULL) { |
273ea72c DG |
5812 | /* TODO: Add --socket PATH option */ |
5813 | ERR("Can't get HOME directory for sockets creation."); | |
4a15001e MD |
5814 | retval = -1; |
5815 | goto exit_init_data; | |
b082db07 DG |
5816 | } |
5817 | ||
67e40797 DG |
5818 | /* |
5819 | * Create rundir from home path. This will create something like | |
5820 | * $HOME/.lttng | |
5821 | */ | |
990570ed | 5822 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 | 5823 | if (ret < 0) { |
4a15001e MD |
5824 | retval = -1; |
5825 | goto exit_init_data; | |
67e40797 DG |
5826 | } |
5827 | ||
4a15001e MD |
5828 | if (create_lttng_rundir(rundir)) { |
5829 | retval = -1; | |
5830 | goto exit_init_data; | |
67e40797 DG |
5831 | } |
5832 | ||
fac6795d | 5833 | if (strlen(apps_unix_sock_path) == 0) { |
4a15001e MD |
5834 | ret = snprintf(apps_unix_sock_path, PATH_MAX, |
5835 | DEFAULT_HOME_APPS_UNIX_SOCK, | |
5836 | home_path); | |
5837 | if (ret < 0) { | |
5838 | retval = -1; | |
5839 | goto exit_init_data; | |
5840 | } | |
fac6795d DG |
5841 | } |
5842 | ||
5843 | /* Set the cli tool unix socket path */ | |
5844 | if (strlen(client_unix_sock_path) == 0) { | |
4a15001e MD |
5845 | ret = snprintf(client_unix_sock_path, PATH_MAX, |
5846 | DEFAULT_HOME_CLIENT_UNIX_SOCK, | |
5847 | home_path); | |
5848 | if (ret < 0) { | |
5849 | retval = -1; | |
5850 | goto exit_init_data; | |
5851 | } | |
fac6795d | 5852 | } |
0fdd1e2c DG |
5853 | |
5854 | /* Set global SHM for ust */ | |
5855 | if (strlen(wait_shm_path) == 0) { | |
4a15001e MD |
5856 | ret = snprintf(wait_shm_path, PATH_MAX, |
5857 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, | |
5858 | getuid()); | |
5859 | if (ret < 0) { | |
5860 | retval = -1; | |
5861 | goto exit_init_data; | |
5862 | } | |
0fdd1e2c | 5863 | } |
44a5e5eb DG |
5864 | |
5865 | /* Set health check Unix path */ | |
5866 | if (strlen(health_unix_sock_path) == 0) { | |
4a15001e MD |
5867 | ret = snprintf(health_unix_sock_path, |
5868 | sizeof(health_unix_sock_path), | |
5869 | DEFAULT_HOME_HEALTH_UNIX_SOCK, | |
5870 | home_path); | |
5871 | if (ret < 0) { | |
5872 | retval = -1; | |
5873 | goto exit_init_data; | |
5874 | } | |
44a5e5eb | 5875 | } |
fac6795d DG |
5876 | } |
5877 | ||
c9cb3e7d JG |
5878 | lockfile_fd = create_lockfile(); |
5879 | if (lockfile_fd < 0) { | |
4a15001e MD |
5880 | retval = -1; |
5881 | goto exit_init_data; | |
c9cb3e7d JG |
5882 | } |
5883 | ||
5c827ce0 DG |
5884 | /* Set consumer initial state */ |
5885 | kernel_consumerd_state = CONSUMER_STOPPED; | |
5886 | ust_consumerd_state = CONSUMER_STOPPED; | |
5887 | ||
847177cd DG |
5888 | DBG("Client socket path %s", client_unix_sock_path); |
5889 | DBG("Application socket path %s", apps_unix_sock_path); | |
d0b96690 | 5890 | DBG("Application wait path %s", wait_shm_path); |
67e40797 DG |
5891 | DBG("LTTng run directory path: %s", rundir); |
5892 | ||
5893 | /* 32 bits consumerd path setup */ | |
4a15001e | 5894 | ret = snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, |
60922cb0 | 5895 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
4a15001e MD |
5896 | if (ret < 0) { |
5897 | PERROR("snprintf 32-bit consumer error socket path"); | |
5898 | retval = -1; | |
5899 | goto exit_init_data; | |
5900 | } | |
5901 | ret = snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, | |
60922cb0 | 5902 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
4a15001e MD |
5903 | if (ret < 0) { |
5904 | PERROR("snprintf 32-bit consumer command socket path"); | |
5905 | retval = -1; | |
5906 | goto exit_init_data; | |
5907 | } | |
67e40797 DG |
5908 | |
5909 | DBG2("UST consumer 32 bits err path: %s", | |
5910 | ustconsumer32_data.err_unix_sock_path); | |
5911 | DBG2("UST consumer 32 bits cmd path: %s", | |
5912 | ustconsumer32_data.cmd_unix_sock_path); | |
5913 | ||
5914 | /* 64 bits consumerd path setup */ | |
4a15001e | 5915 | ret = snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, |
60922cb0 | 5916 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
4a15001e MD |
5917 | if (ret < 0) { |
5918 | PERROR("snprintf 64-bit consumer error socket path"); | |
5919 | retval = -1; | |
5920 | goto exit_init_data; | |
5921 | } | |
5922 | ret = snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, | |
60922cb0 | 5923 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
4a15001e MD |
5924 | if (ret < 0) { |
5925 | PERROR("snprintf 64-bit consumer command socket path"); | |
5926 | retval = -1; | |
5927 | goto exit_init_data; | |
5928 | } | |
67e40797 DG |
5929 | |
5930 | DBG2("UST consumer 64 bits err path: %s", | |
5931 | ustconsumer64_data.err_unix_sock_path); | |
5932 | DBG2("UST consumer 64 bits cmd path: %s", | |
5933 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 5934 | |
273ea72c | 5935 | /* |
7d8234d9 | 5936 | * See if daemon already exist. |
fac6795d | 5937 | */ |
4a15001e | 5938 | if (check_existing_daemon()) { |
75462a81 | 5939 | ERR("Already running daemon.\n"); |
273ea72c | 5940 | /* |
cf3af59e MD |
5941 | * We do not goto exit because we must not cleanup() |
5942 | * because a daemon is already running. | |
ab118b20 | 5943 | */ |
4a15001e MD |
5944 | retval = -1; |
5945 | goto exit_init_data; | |
a88df331 DG |
5946 | } |
5947 | ||
1427f9b2 DG |
5948 | /* |
5949 | * Init UST app hash table. Alloc hash table before this point since | |
5950 | * cleanup() can get called after that point. | |
5951 | */ | |
4a15001e | 5952 | if (ust_app_ht_alloc()) { |
ddbeb0f6 | 5953 | ERR("Failed to allocate UST app hash table"); |
4a15001e MD |
5954 | retval = -1; |
5955 | goto exit_init_data; | |
5956 | } | |
1427f9b2 | 5957 | |
6a4e4039 JG |
5958 | /* |
5959 | * Initialize agent app hash table. We allocate the hash table here | |
5960 | * since cleanup() can get called after this point. | |
5961 | */ | |
5962 | if (agent_app_ht_alloc()) { | |
5963 | ERR("Failed to allocate Agent app hash table"); | |
4a15001e MD |
5964 | retval = -1; |
5965 | goto exit_init_data; | |
f20baf8e DG |
5966 | } |
5967 | ||
a88df331 DG |
5968 | /* |
5969 | * These actions must be executed as root. We do that *after* setting up | |
5970 | * the sockets path because we MUST make the check for another daemon using | |
5971 | * those paths *before* trying to set the kernel consumer sockets and init | |
5972 | * kernel tracer. | |
5973 | */ | |
5974 | if (is_root) { | |
4a15001e MD |
5975 | if (set_consumer_sockets(&kconsumer_data, rundir)) { |
5976 | retval = -1; | |
5977 | goto exit_init_data; | |
7753dea8 MD |
5978 | } |
5979 | ||
a88df331 | 5980 | /* Setup kernel tracer */ |
4fba7219 DG |
5981 | if (!opt_no_kernel) { |
5982 | init_kernel_tracer(); | |
89588270 DG |
5983 | if (kernel_tracer_fd >= 0) { |
5984 | ret = syscall_init_table(); | |
5985 | if (ret < 0) { | |
4a15001e MD |
5986 | ERR("Unable to populate syscall table. " |
5987 | "Syscall tracing won't work " | |
5988 | "for this session daemon."); | |
89588270 | 5989 | } |
834978fd | 5990 | } |
4fba7219 | 5991 | } |
a88df331 DG |
5992 | |
5993 | /* Set ulimit for open files */ | |
5994 | set_ulimit(); | |
fac6795d | 5995 | } |
4063050c MD |
5996 | /* init lttng_fd tracking must be done after set_ulimit. */ |
5997 | lttng_fd_init(); | |
fac6795d | 5998 | |
4a15001e MD |
5999 | if (set_consumer_sockets(&ustconsumer64_data, rundir)) { |
6000 | retval = -1; | |
6001 | goto exit_init_data; | |
67e40797 DG |
6002 | } |
6003 | ||
4a15001e MD |
6004 | if (set_consumer_sockets(&ustconsumer32_data, rundir)) { |
6005 | retval = -1; | |
6006 | goto exit_init_data; | |
67e40797 DG |
6007 | } |
6008 | ||
d6f42150 | 6009 | /* Setup the needed unix socket */ |
4a15001e MD |
6010 | if (init_daemon_socket()) { |
6011 | retval = -1; | |
6012 | goto exit_init_data; | |
fac6795d DG |
6013 | } |
6014 | ||
6015 | /* Set credentials to socket */ | |
4a15001e MD |
6016 | if (is_root && set_permissions(rundir)) { |
6017 | retval = -1; | |
6018 | goto exit_init_data; | |
fac6795d DG |
6019 | } |
6020 | ||
5b8719f5 DG |
6021 | /* Get parent pid if -S, --sig-parent is specified. */ |
6022 | if (opt_sig_parent) { | |
6023 | ppid = getppid(); | |
6024 | } | |
6025 | ||
7a485870 | 6026 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 | 6027 | if (is_root && !opt_no_kernel) { |
4a15001e MD |
6028 | if (utils_create_pipe_cloexec(kernel_poll_pipe)) { |
6029 | retval = -1; | |
6030 | goto exit_init_data; | |
6620da75 | 6031 | } |
7a485870 DG |
6032 | } |
6033 | ||
099e26bd | 6034 | /* Setup the thread apps communication pipe. */ |
4a15001e MD |
6035 | if (utils_create_pipe_cloexec(apps_cmd_pipe)) { |
6036 | retval = -1; | |
6037 | goto exit_init_data; | |
099e26bd DG |
6038 | } |
6039 | ||
d0b96690 | 6040 | /* Setup the thread apps notify communication pipe. */ |
4a15001e MD |
6041 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) { |
6042 | retval = -1; | |
6043 | goto exit_init_data; | |
d0b96690 DG |
6044 | } |
6045 | ||
7972aab2 DG |
6046 | /* Initialize global buffer per UID and PID registry. */ |
6047 | buffer_reg_init_uid_registry(); | |
6048 | buffer_reg_init_pid_registry(); | |
6049 | ||
099e26bd | 6050 | /* Init UST command queue. */ |
8bdee6e2 | 6051 | cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 6052 | |
273ea72c | 6053 | /* |
4a15001e MD |
6054 | * Get session list pointer. This pointer MUST NOT be free'd. This list |
6055 | * is statically declared in session.c | |
273ea72c | 6056 | */ |
54d01ffb | 6057 | session_list_ptr = session_get_list(); |
b5541356 | 6058 | |
2f77fc4b | 6059 | cmd_init(); |
00e2e675 | 6060 | |
ae9e45b3 DG |
6061 | /* Check for the application socket timeout env variable. */ |
6062 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
6063 | if (env_app_timeout) { | |
6064 | app_socket_timeout = atoi(env_app_timeout); | |
6065 | } else { | |
6066 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
6067 | } | |
6068 | ||
4a15001e MD |
6069 | ret = write_pidfile(); |
6070 | if (ret) { | |
6071 | ERR("Error in write_pidfile"); | |
6072 | retval = -1; | |
6073 | goto exit_init_data; | |
6074 | } | |
6075 | ret = write_agent_port(); | |
6076 | if (ret) { | |
6077 | ERR("Error in write_agent_port"); | |
6078 | retval = -1; | |
6079 | goto exit_init_data; | |
6080 | } | |
35f90c40 | 6081 | |
554831e7 MD |
6082 | /* Initialize communication library */ |
6083 | lttcomm_init(); | |
4a15001e | 6084 | /* Initialize TCP timeout values */ |
d831c249 | 6085 | lttcomm_inet_init(); |
554831e7 | 6086 | |
ef367a93 | 6087 | if (load_session_init_data(&load_info) < 0) { |
4a15001e MD |
6088 | retval = -1; |
6089 | goto exit_init_data; | |
ef367a93 JG |
6090 | } |
6091 | load_info->path = opt_load_session_path; | |
6092 | ||
d5b9fd2f | 6093 | /* Create health-check thread */ |
1a1a34b4 | 6094 | ret = pthread_create(&health_thread, default_pthread_attr(), |
44a5e5eb | 6095 | thread_manage_health, (void *) NULL); |
4a15001e MD |
6096 | if (ret) { |
6097 | errno = ret; | |
44a5e5eb | 6098 | PERROR("pthread_create health"); |
4a15001e | 6099 | retval = -1; |
44a5e5eb DG |
6100 | goto exit_health; |
6101 | } | |
6102 | ||
cf3af59e | 6103 | /* Create thread to manage the client socket */ |
1a1a34b4 | 6104 | ret = pthread_create(&client_thread, default_pthread_attr(), |
099e26bd | 6105 | thread_manage_clients, (void *) NULL); |
4a15001e MD |
6106 | if (ret) { |
6107 | errno = ret; | |
76d7553f | 6108 | PERROR("pthread_create clients"); |
4a15001e | 6109 | retval = -1; |
cf3af59e MD |
6110 | goto exit_client; |
6111 | } | |
fac6795d | 6112 | |
099e26bd | 6113 | /* Create thread to dispatch registration */ |
1a1a34b4 | 6114 | ret = pthread_create(&dispatch_thread, default_pthread_attr(), |
099e26bd | 6115 | thread_dispatch_ust_registration, (void *) NULL); |
4a15001e MD |
6116 | if (ret) { |
6117 | errno = ret; | |
76d7553f | 6118 | PERROR("pthread_create dispatch"); |
4a15001e | 6119 | retval = -1; |
099e26bd DG |
6120 | goto exit_dispatch; |
6121 | } | |
6122 | ||
6123 | /* Create thread to manage application registration. */ | |
1a1a34b4 | 6124 | ret = pthread_create(®_apps_thread, default_pthread_attr(), |
099e26bd | 6125 | thread_registration_apps, (void *) NULL); |
4a15001e MD |
6126 | if (ret) { |
6127 | errno = ret; | |
76d7553f | 6128 | PERROR("pthread_create registration"); |
4a15001e | 6129 | retval = -1; |
099e26bd DG |
6130 | goto exit_reg_apps; |
6131 | } | |
6132 | ||
cf3af59e | 6133 | /* Create thread to manage application socket */ |
1a1a34b4 | 6134 | ret = pthread_create(&apps_thread, default_pthread_attr(), |
54d01ffb | 6135 | thread_manage_apps, (void *) NULL); |
4a15001e MD |
6136 | if (ret) { |
6137 | errno = ret; | |
d0b96690 | 6138 | PERROR("pthread_create apps"); |
4a15001e | 6139 | retval = -1; |
d0b96690 DG |
6140 | goto exit_apps; |
6141 | } | |
6142 | ||
6143 | /* Create thread to manage application notify socket */ | |
1a1a34b4 | 6144 | ret = pthread_create(&apps_notify_thread, default_pthread_attr(), |
d0b96690 | 6145 | ust_thread_manage_notify, (void *) NULL); |
4a15001e MD |
6146 | if (ret) { |
6147 | errno = ret; | |
f5c32ef1 | 6148 | PERROR("pthread_create notify"); |
4a15001e | 6149 | retval = -1; |
9563b0ad | 6150 | goto exit_apps_notify; |
cf3af59e | 6151 | } |
fac6795d | 6152 | |
022d91ba | 6153 | /* Create agent registration thread. */ |
1a1a34b4 | 6154 | ret = pthread_create(&agent_reg_thread, default_pthread_attr(), |
022d91ba | 6155 | agent_thread_manage_registration, (void *) NULL); |
4a15001e MD |
6156 | if (ret) { |
6157 | errno = ret; | |
022d91ba | 6158 | PERROR("pthread_create agent"); |
4a15001e | 6159 | retval = -1; |
022d91ba | 6160 | goto exit_agent_reg; |
4d076222 DG |
6161 | } |
6162 | ||
6620da75 DG |
6163 | /* Don't start this thread if kernel tracing is not requested nor root */ |
6164 | if (is_root && !opt_no_kernel) { | |
6165 | /* Create kernel thread to manage kernel event */ | |
1a1a34b4 | 6166 | ret = pthread_create(&kernel_thread, default_pthread_attr(), |
6620da75 | 6167 | thread_manage_kernel, (void *) NULL); |
4a15001e MD |
6168 | if (ret) { |
6169 | errno = ret; | |
6620da75 | 6170 | PERROR("pthread_create kernel"); |
4a15001e | 6171 | retval = -1; |
6620da75 DG |
6172 | goto exit_kernel; |
6173 | } | |
ef367a93 | 6174 | } |
7a485870 | 6175 | |
4a15001e | 6176 | /* Create session loading thread. */ |
1a1a34b4 MJ |
6177 | ret = pthread_create(&load_session_thread, default_pthread_attr(), |
6178 | thread_load_session, load_info); | |
4a15001e MD |
6179 | if (ret) { |
6180 | errno = ret; | |
6181 | PERROR("pthread_create load_session_thread"); | |
6182 | retval = -1; | |
6183 | goto exit_load_session; | |
6184 | } | |
6185 | ||
6186 | /* | |
6187 | * This is where we start awaiting program completion (e.g. through | |
6188 | * signal that asks threads to teardown). | |
6189 | */ | |
6190 | ||
6191 | ret = pthread_join(load_session_thread, &status); | |
6192 | if (ret) { | |
6193 | errno = ret; | |
6194 | PERROR("pthread_join load_session_thread"); | |
6195 | retval = -1; | |
6196 | } | |
6197 | exit_load_session: | |
ef367a93 JG |
6198 | |
6199 | if (is_root && !opt_no_kernel) { | |
6620da75 | 6200 | ret = pthread_join(kernel_thread, &status); |
4a15001e MD |
6201 | if (ret) { |
6202 | errno = ret; | |
6620da75 | 6203 | PERROR("pthread_join"); |
4a15001e | 6204 | retval = -1; |
6620da75 | 6205 | } |
fac6795d | 6206 | } |
cf3af59e | 6207 | exit_kernel: |
4a15001e | 6208 | |
022d91ba | 6209 | ret = pthread_join(agent_reg_thread, &status); |
4a15001e MD |
6210 | if (ret) { |
6211 | errno = ret; | |
022d91ba | 6212 | PERROR("pthread_join agent"); |
4a15001e | 6213 | retval = -1; |
4d076222 | 6214 | } |
022d91ba | 6215 | exit_agent_reg: |
4a15001e | 6216 | |
9563b0ad | 6217 | ret = pthread_join(apps_notify_thread, &status); |
4a15001e MD |
6218 | if (ret) { |
6219 | errno = ret; | |
9563b0ad | 6220 | PERROR("pthread_join apps notify"); |
4a15001e | 6221 | retval = -1; |
9563b0ad | 6222 | } |
9563b0ad | 6223 | exit_apps_notify: |
4a15001e | 6224 | |
cf3af59e | 6225 | ret = pthread_join(apps_thread, &status); |
4a15001e MD |
6226 | if (ret) { |
6227 | errno = ret; | |
9563b0ad | 6228 | PERROR("pthread_join apps"); |
4a15001e | 6229 | retval = -1; |
cf3af59e | 6230 | } |
cf3af59e | 6231 | exit_apps: |
4a15001e | 6232 | |
099e26bd | 6233 | ret = pthread_join(reg_apps_thread, &status); |
4a15001e MD |
6234 | if (ret) { |
6235 | errno = ret; | |
76d7553f | 6236 | PERROR("pthread_join"); |
4a15001e | 6237 | retval = -1; |
099e26bd | 6238 | } |
099e26bd | 6239 | exit_reg_apps: |
4a15001e | 6240 | |
772b8f4d MD |
6241 | /* |
6242 | * Join dispatch thread after joining reg_apps_thread to ensure | |
6243 | * we don't leak applications in the queue. | |
6244 | */ | |
099e26bd | 6245 | ret = pthread_join(dispatch_thread, &status); |
4a15001e MD |
6246 | if (ret) { |
6247 | errno = ret; | |
76d7553f | 6248 | PERROR("pthread_join"); |
4a15001e | 6249 | retval = -1; |
099e26bd | 6250 | } |
099e26bd | 6251 | exit_dispatch: |
4a15001e | 6252 | |
cf3af59e | 6253 | ret = pthread_join(client_thread, &status); |
4a15001e MD |
6254 | if (ret) { |
6255 | errno = ret; | |
76d7553f | 6256 | PERROR("pthread_join"); |
4a15001e | 6257 | retval = -1; |
cf3af59e | 6258 | } |
4a15001e | 6259 | exit_client: |
a88df331 | 6260 | |
4a15001e MD |
6261 | ret = pthread_join(health_thread, &status); |
6262 | if (ret) { | |
6263 | errno = ret; | |
6264 | PERROR("pthread_join health thread"); | |
6265 | retval = -1; | |
06f525de | 6266 | } |
4a15001e | 6267 | exit_health: |
06f525de | 6268 | |
4a15001e | 6269 | exit_init_data: |
2668465a MD |
6270 | /* |
6271 | * Wait for all pending call_rcu work to complete before tearing | |
6272 | * down data structures. call_rcu worker may be trying to | |
6273 | * perform lookups in those structures. | |
6274 | */ | |
6275 | rcu_barrier(); | |
4a15001e MD |
6276 | /* |
6277 | * sessiond_cleanup() is called when no other thread is running, except | |
6278 | * the ht_cleanup thread, which is needed to destroy the hash tables. | |
6279 | */ | |
6280 | rcu_thread_online(); | |
6281 | sessiond_cleanup(); | |
6282 | rcu_thread_offline(); | |
6283 | rcu_unregister_thread(); | |
06f525de | 6284 | |
c4d5de9d JG |
6285 | /* |
6286 | * Ensure all prior call_rcu are done. call_rcu callbacks may push | |
6287 | * hash tables to the ht_cleanup thread. Therefore, we ensure that | |
6288 | * the queue is empty before shutting down the clean-up thread. | |
6289 | */ | |
6290 | rcu_barrier(); | |
6291 | ||
5e97de00 | 6292 | ret = fini_ht_cleanup_thread(&ht_cleanup_thread); |
4a15001e | 6293 | if (ret) { |
4a15001e | 6294 | retval = -1; |
0b2dc8df MD |
6295 | } |
6296 | exit_ht_cleanup: | |
4a15001e | 6297 | |
4a15001e MD |
6298 | health_app_destroy(health_sessiond); |
6299 | exit_health_sessiond_cleanup: | |
7567352f | 6300 | exit_create_run_as_worker_cleanup: |
4a15001e MD |
6301 | |
6302 | exit_options: | |
6303 | sessiond_cleanup_options(); | |
6304 | ||
6305 | exit_set_signal_handler: | |
0658924e | 6306 | |
4a15001e | 6307 | if (!retval) { |
cf3af59e | 6308 | exit(EXIT_SUCCESS); |
4a15001e MD |
6309 | } else { |
6310 | exit(EXIT_FAILURE); | |
67e40797 | 6311 | } |
fac6795d | 6312 | } |