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> |
fac6795d | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 | 8 | * |
d14d33bf AM |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
91d76f53 | 13 | * |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
fac6795d DG |
20 | #include <getopt.h> |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
0fdd1e2c | 28 | #include <sys/mman.h> |
b73401da | 29 | #include <sys/mount.h> |
1e307fab | 30 | #include <sys/resource.h> |
fac6795d DG |
31 | #include <sys/socket.h> |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
0fdd1e2c | 34 | #include <sys/wait.h> |
5c827ce0 | 35 | #include <urcu/uatomic.h> |
fac6795d | 36 | #include <unistd.h> |
3bd1e081 | 37 | #include <config.h> |
fac6795d | 38 | |
990570ed | 39 | #include <common/common.h> |
0ba98ebc | 40 | #include <common/compat/poll.h> |
d27c42b8 | 41 | #include <common/compat/socket.h> |
db758600 DG |
42 | #include <common/defaults.h> |
43 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 44 | #include <common/futex.h> |
00e2e675 | 45 | #include <common/relayd/relayd.h> |
81b86775 | 46 | #include <common/utils.h> |
fac6795d | 47 | |
10a8a223 | 48 | #include "lttng-sessiond.h" |
54d01ffb | 49 | #include "channel.h" |
2f77fc4b | 50 | #include "cmd.h" |
00e2e675 | 51 | #include "consumer.h" |
099e26bd | 52 | #include "context.h" |
54d01ffb | 53 | #include "event.h" |
4771f025 | 54 | #include "kernel.h" |
f1e16794 | 55 | #include "kernel-consumer.h" |
096102bd | 56 | #include "modprobe.h" |
0fdd1e2c | 57 | #include "shm.h" |
1e307fab | 58 | #include "ust-ctl.h" |
00e2e675 | 59 | #include "ust-consumer.h" |
8e68d1c8 | 60 | #include "utils.h" |
4063050c | 61 | #include "fd-limit.h" |
53a80697 | 62 | #include "filter.h" |
44a5e5eb | 63 | #include "health.h" |
8ac94142 | 64 | #include "testpoint.h" |
fac6795d | 65 | |
ebaeda94 MD |
66 | #define CONSUMERD_FILE "lttng-consumerd" |
67 | ||
75462a81 | 68 | /* Const values */ |
686204ab | 69 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 70 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
71 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
72 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
73 | ||
fac6795d DG |
74 | const char *progname; |
75 | const char *opt_tracing_group; | |
5b8719f5 | 76 | static int opt_sig_parent; |
97e19046 | 77 | static int opt_verbose_consumer; |
fac6795d | 78 | static int opt_daemon; |
4fba7219 | 79 | static int opt_no_kernel; |
fac6795d | 80 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 81 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 82 | static char *rundir; |
3bd1e081 | 83 | |
a23ec3a7 DG |
84 | /* |
85 | * Consumer daemon specific control data. Every value not initialized here is | |
86 | * set to 0 by the static definition. | |
87 | */ | |
3bd1e081 MD |
88 | static struct consumer_data kconsumer_data = { |
89 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
90 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
91 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
92 | .err_sock = -1, |
93 | .cmd_sock = -1, | |
173af62f DG |
94 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
95 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
96 | .cond = PTHREAD_COND_INITIALIZER, |
97 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 98 | }; |
7753dea8 MD |
99 | static struct consumer_data ustconsumer64_data = { |
100 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
101 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
102 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
103 | .err_sock = -1, |
104 | .cmd_sock = -1, | |
173af62f DG |
105 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
106 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
107 | .cond = PTHREAD_COND_INITIALIZER, |
108 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
109 | }; |
110 | static struct consumer_data ustconsumer32_data = { | |
111 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
112 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
113 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
114 | .err_sock = -1, |
115 | .cmd_sock = -1, | |
173af62f DG |
116 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
117 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
118 | .cond = PTHREAD_COND_INITIALIZER, |
119 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
120 | }; |
121 | ||
26c9d55e | 122 | /* Shared between threads */ |
099e26bd | 123 | static int dispatch_thread_exit; |
fac6795d | 124 | |
54d01ffb DG |
125 | /* Global application Unix socket path */ |
126 | static char apps_unix_sock_path[PATH_MAX]; | |
127 | /* Global client Unix socket path */ | |
128 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
129 | /* global wait shm path for UST */ |
130 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
131 | /* Global health check unix path */ |
132 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 133 | |
1d4b027a | 134 | /* Sockets and FDs */ |
a4b35e07 MD |
135 | static int client_sock = -1; |
136 | static int apps_sock = -1; | |
2f77fc4b | 137 | int kernel_tracer_fd = -1; |
76d7553f | 138 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 139 | |
273ea72c DG |
140 | /* |
141 | * Quit pipe for all threads. This permits a single cancellation point | |
142 | * for all threads when receiving an event on the pipe. | |
143 | */ | |
76d7553f | 144 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 145 | |
099e26bd DG |
146 | /* |
147 | * This pipe is used to inform the thread managing application communication | |
148 | * that a command is queued and ready to be processed. | |
149 | */ | |
76d7553f | 150 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 151 | |
1d4b027a | 152 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 153 | static pthread_t apps_thread; |
099e26bd | 154 | static pthread_t reg_apps_thread; |
1d4b027a | 155 | static pthread_t client_thread; |
7a485870 | 156 | static pthread_t kernel_thread; |
099e26bd | 157 | static pthread_t dispatch_thread; |
44a5e5eb | 158 | static pthread_t health_thread; |
5eb91c98 | 159 | |
099e26bd DG |
160 | /* |
161 | * UST registration command queue. This queue is tied with a futex and uses a N | |
162 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
163 | * | |
164 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
165 | * this queue and the wait/wake scheme. | |
166 | */ | |
167 | static struct ust_cmd_queue ust_cmd_queue; | |
168 | ||
b5541356 DG |
169 | /* |
170 | * Pointer initialized before thread creation. | |
171 | * | |
172 | * This points to the tracing session list containing the session count and a | |
173 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
174 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 175 | * |
d063d709 | 176 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 177 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
178 | */ |
179 | static struct ltt_session_list *session_list_ptr; | |
180 | ||
7753dea8 MD |
181 | int ust_consumerd64_fd = -1; |
182 | int ust_consumerd32_fd = -1; | |
183 | ||
fb6f1fa2 YB |
184 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
185 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
186 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
187 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 188 | |
2f77fc4b DG |
189 | static const char *module_proc_lttng = "/proc/lttng"; |
190 | ||
5c827ce0 DG |
191 | /* |
192 | * Consumer daemon state which is changed when spawning it, killing it or in | |
193 | * case of a fatal error. | |
194 | */ | |
195 | enum consumerd_state { | |
196 | CONSUMER_STARTED = 1, | |
197 | CONSUMER_STOPPED = 2, | |
198 | CONSUMER_ERROR = 3, | |
199 | }; | |
200 | ||
201 | /* | |
202 | * This consumer daemon state is used to validate if a client command will be | |
203 | * able to reach the consumer. If not, the client is informed. For instance, | |
204 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
205 | * error to the client. | |
206 | * | |
207 | * The following example shows a possible race condition of this scheme: | |
208 | * | |
209 | * consumer thread error happens | |
210 | * client cmd arrives | |
211 | * client cmd checks state -> still OK | |
212 | * consumer thread exit, sets error | |
213 | * client cmd try to talk to consumer | |
214 | * ... | |
215 | * | |
216 | * However, since the consumer is a different daemon, we have no way of making | |
217 | * sure the command will reach it safely even with this state flag. This is why | |
218 | * we consider that up to the state validation during command processing, the | |
219 | * command is safe. After that, we can not guarantee the correctness of the | |
220 | * client request vis-a-vis the consumer. | |
221 | */ | |
222 | static enum consumerd_state ust_consumerd_state; | |
223 | static enum consumerd_state kernel_consumerd_state; | |
224 | ||
44a5e5eb DG |
225 | /* Used for the health monitoring of the session daemon. See health.h */ |
226 | struct health_state health_thread_cmd; | |
139ac872 | 227 | struct health_state health_thread_app_manage; |
44a5e5eb DG |
228 | struct health_state health_thread_app_reg; |
229 | struct health_state health_thread_kernel; | |
230 | ||
fb09408a | 231 | static |
7753dea8 | 232 | void setup_consumerd_path(void) |
fb09408a | 233 | { |
fc7a59ce | 234 | const char *bin, *libdir; |
fb09408a | 235 | |
7753dea8 MD |
236 | /* |
237 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
238 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
239 | * has not been defined. | |
7753dea8 | 240 | */ |
ebaeda94 | 241 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
242 | if (!consumerd32_bin[0]) { |
243 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
244 | } |
245 | if (!consumerd32_libdir[0]) { | |
246 | consumerd32_libdir = INSTALL_LIB_PATH; | |
247 | } | |
248 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
249 | if (!consumerd64_bin[0]) { |
250 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 251 | } |
ebaeda94 MD |
252 | if (!consumerd64_libdir[0]) { |
253 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
254 | } |
255 | #else | |
256 | #error "Unknown bitness" | |
257 | #endif | |
258 | ||
fb09408a MD |
259 | /* |
260 | * runtime env. var. overrides the build default. | |
261 | */ | |
fc7a59ce AM |
262 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
263 | if (bin) { | |
264 | consumerd32_bin = bin; | |
7753dea8 | 265 | } |
fc7a59ce AM |
266 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
267 | if (bin) { | |
268 | consumerd64_bin = bin; | |
ebaeda94 | 269 | } |
72f579ee | 270 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
271 | if (libdir) { |
272 | consumerd32_libdir = libdir; | |
273 | } | |
72f579ee | 274 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
275 | if (libdir) { |
276 | consumerd64_libdir = libdir; | |
fb09408a MD |
277 | } |
278 | } | |
279 | ||
5eb91c98 DG |
280 | /* |
281 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
282 | */ | |
283 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
284 | unsigned int size) | |
285 | { | |
286 | int ret; | |
287 | ||
288 | if (events == NULL || size == 0) { | |
289 | ret = -1; | |
290 | goto error; | |
291 | } | |
292 | ||
293 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
294 | if (ret < 0) { | |
295 | goto error; | |
296 | } | |
297 | ||
298 | /* Add quit pipe */ | |
299 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
300 | if (ret < 0) { | |
301 | goto error; | |
302 | } | |
303 | ||
304 | return 0; | |
305 | ||
306 | error: | |
307 | return ret; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Check if the thread quit pipe was triggered. | |
312 | * | |
313 | * Return 1 if it was triggered else 0; | |
314 | */ | |
315 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
316 | { | |
317 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
318 | return 1; | |
319 | } | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
0fdd1e2c DG |
324 | /* |
325 | * Return group ID of the tracing group or -1 if not found. | |
326 | */ | |
996b65c8 MD |
327 | static gid_t allowed_group(void) |
328 | { | |
329 | struct group *grp; | |
330 | ||
274e143b MD |
331 | if (opt_tracing_group) { |
332 | grp = getgrnam(opt_tracing_group); | |
333 | } else { | |
334 | grp = getgrnam(default_tracing_group); | |
335 | } | |
996b65c8 MD |
336 | if (!grp) { |
337 | return -1; | |
338 | } else { | |
339 | return grp->gr_gid; | |
340 | } | |
341 | } | |
342 | ||
273ea72c | 343 | /* |
5eb91c98 | 344 | * Init thread quit pipe. |
273ea72c DG |
345 | * |
346 | * Return -1 on error or 0 if all pipes are created. | |
347 | */ | |
348 | static int init_thread_quit_pipe(void) | |
349 | { | |
730389d9 | 350 | int ret, i; |
273ea72c | 351 | |
730389d9 | 352 | ret = pipe(thread_quit_pipe); |
273ea72c | 353 | if (ret < 0) { |
730389d9 | 354 | PERROR("thread quit pipe"); |
273ea72c DG |
355 | goto error; |
356 | } | |
357 | ||
730389d9 DG |
358 | for (i = 0; i < 2; i++) { |
359 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
360 | if (ret < 0) { | |
361 | PERROR("fcntl"); | |
362 | goto error; | |
363 | } | |
364 | } | |
365 | ||
273ea72c DG |
366 | error: |
367 | return ret; | |
368 | } | |
369 | ||
099e26bd DG |
370 | /* |
371 | * Stop all threads by closing the thread quit pipe. | |
372 | */ | |
cf3af59e MD |
373 | static void stop_threads(void) |
374 | { | |
5eb91c98 DG |
375 | int ret; |
376 | ||
cf3af59e MD |
377 | /* Stopping all threads */ |
378 | DBG("Terminating all threads"); | |
54d01ffb | 379 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
380 | if (ret < 0) { |
381 | ERR("write error on thread quit pipe"); | |
382 | } | |
383 | ||
099e26bd | 384 | /* Dispatch thread */ |
26c9d55e | 385 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 386 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
387 | } |
388 | ||
fac6795d | 389 | /* |
d063d709 | 390 | * Cleanup the daemon |
fac6795d | 391 | */ |
cf3af59e | 392 | static void cleanup(void) |
fac6795d | 393 | { |
ef599319 | 394 | int ret; |
1d4b027a | 395 | char *cmd; |
af9737e9 | 396 | struct ltt_session *sess, *stmp; |
fac6795d | 397 | |
1d4b027a | 398 | DBG("Cleaning up"); |
e07ae692 | 399 | |
2f77fc4b DG |
400 | /* First thing first, stop all threads */ |
401 | utils_close_pipe(thread_quit_pipe); | |
402 | ||
67e40797 DG |
403 | DBG("Removing %s directory", rundir); |
404 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
405 | if (ret < 0) { | |
406 | ERR("asprintf failed. Something is really wrong!"); | |
407 | } | |
5461b305 | 408 | |
67e40797 DG |
409 | /* Remove lttng run directory */ |
410 | ret = system(cmd); | |
411 | if (ret < 0) { | |
412 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 413 | } |
67e40797 | 414 | free(cmd); |
5461b305 | 415 | |
99bab54f | 416 | DBG("Cleaning up all sessions"); |
fac6795d | 417 | |
b5541356 | 418 | /* Destroy session list mutex */ |
273ea72c DG |
419 | if (session_list_ptr != NULL) { |
420 | pthread_mutex_destroy(&session_list_ptr->lock); | |
421 | ||
422 | /* Cleanup ALL session */ | |
54d01ffb DG |
423 | cds_list_for_each_entry_safe(sess, stmp, |
424 | &session_list_ptr->head, list) { | |
2f77fc4b | 425 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
426 | } |
427 | } | |
428 | ||
099e26bd | 429 | DBG("Closing all UST sockets"); |
56fff090 | 430 | ust_app_clean_list(); |
099e26bd | 431 | |
4fba7219 DG |
432 | if (is_root && !opt_no_kernel) { |
433 | DBG2("Closing kernel fd"); | |
a4b35e07 | 434 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
435 | ret = close(kernel_tracer_fd); |
436 | if (ret) { | |
437 | PERROR("close"); | |
438 | } | |
a4b35e07 | 439 | } |
2f50c8a3 | 440 | DBG("Unloading kernel modules"); |
096102bd | 441 | modprobe_remove_lttng_all(); |
2f50c8a3 | 442 | } |
2f77fc4b | 443 | |
ef599319 | 444 | utils_close_pipe(kernel_poll_pipe); |
ef599319 | 445 | utils_close_pipe(apps_cmd_pipe); |
421cb601 DG |
446 | |
447 | /* <fun> */ | |
f56a39af | 448 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
449 | "Matthew, BEET driven development works!%c[%dm", |
450 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
451 | /* </fun> */ | |
fac6795d DG |
452 | } |
453 | ||
e065084a | 454 | /* |
d063d709 | 455 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 456 | * |
d063d709 | 457 | * Return lttcomm error code. |
e065084a DG |
458 | */ |
459 | static int send_unix_sock(int sock, void *buf, size_t len) | |
460 | { | |
461 | /* Check valid length */ | |
462 | if (len <= 0) { | |
463 | return -1; | |
464 | } | |
465 | ||
466 | return lttcomm_send_unix_sock(sock, buf, len); | |
467 | } | |
468 | ||
5461b305 | 469 | /* |
d063d709 | 470 | * Free memory of a command context structure. |
5461b305 | 471 | */ |
a2fb29a5 | 472 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 473 | { |
a2fb29a5 DG |
474 | DBG("Clean command context structure"); |
475 | if (*cmd_ctx) { | |
476 | if ((*cmd_ctx)->llm) { | |
477 | free((*cmd_ctx)->llm); | |
5461b305 | 478 | } |
a2fb29a5 DG |
479 | if ((*cmd_ctx)->lsm) { |
480 | free((*cmd_ctx)->lsm); | |
5461b305 | 481 | } |
a2fb29a5 DG |
482 | free(*cmd_ctx); |
483 | *cmd_ctx = NULL; | |
5461b305 DG |
484 | } |
485 | } | |
486 | ||
fac6795d | 487 | /* |
0fdd1e2c | 488 | * Notify UST applications using the shm mmap futex. |
fac6795d | 489 | */ |
0fdd1e2c | 490 | static int notify_ust_apps(int active) |
fac6795d | 491 | { |
0fdd1e2c | 492 | char *wait_shm_mmap; |
fac6795d | 493 | |
0fdd1e2c | 494 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 495 | |
0fdd1e2c DG |
496 | /* See shm.c for this call implying mmap, shm and futex calls */ |
497 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
498 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
499 | goto error; |
500 | } | |
501 | ||
0fdd1e2c DG |
502 | /* Wake waiting process */ |
503 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
504 | ||
505 | /* Apps notified successfully */ | |
506 | return 0; | |
fac6795d DG |
507 | |
508 | error: | |
0fdd1e2c | 509 | return -1; |
fac6795d DG |
510 | } |
511 | ||
e065084a | 512 | /* |
d063d709 DG |
513 | * Setup the outgoing data buffer for the response (llm) by allocating the |
514 | * right amount of memory and copying the original information from the lsm | |
515 | * structure. | |
ca95a216 | 516 | * |
d063d709 | 517 | * Return total size of the buffer pointed by buf. |
ca95a216 | 518 | */ |
5461b305 | 519 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 520 | { |
f3ed775e | 521 | int ret, buf_size; |
ca95a216 | 522 | |
f3ed775e | 523 | buf_size = size; |
5461b305 | 524 | |
ba7f0ae5 | 525 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 526 | if (cmd_ctx->llm == NULL) { |
76d7553f | 527 | PERROR("zmalloc"); |
5461b305 | 528 | ret = -ENOMEM; |
ca95a216 DG |
529 | goto error; |
530 | } | |
531 | ||
5461b305 DG |
532 | /* Copy common data */ |
533 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 534 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 535 | |
5461b305 DG |
536 | cmd_ctx->llm->data_size = size; |
537 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
538 | ||
ca95a216 DG |
539 | return buf_size; |
540 | ||
541 | error: | |
542 | return ret; | |
543 | } | |
544 | ||
7a485870 | 545 | /* |
5eb91c98 | 546 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 547 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 548 | */ |
5eb91c98 | 549 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 550 | { |
5eb91c98 | 551 | int ret; |
7a485870 DG |
552 | struct ltt_session *session; |
553 | struct ltt_kernel_channel *channel; | |
554 | ||
5eb91c98 | 555 | DBG("Updating kernel poll set"); |
7a485870 | 556 | |
54d01ffb | 557 | session_lock_list(); |
b5541356 | 558 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 559 | session_lock(session); |
7a485870 | 560 | if (session->kernel_session == NULL) { |
54d01ffb | 561 | session_unlock(session); |
7a485870 DG |
562 | continue; |
563 | } | |
7a485870 | 564 | |
54d01ffb DG |
565 | cds_list_for_each_entry(channel, |
566 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
567 | /* Add channel fd to the kernel poll set */ |
568 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
569 | if (ret < 0) { | |
54d01ffb | 570 | session_unlock(session); |
5eb91c98 DG |
571 | goto error; |
572 | } | |
573 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 574 | } |
54d01ffb | 575 | session_unlock(session); |
7a485870 | 576 | } |
54d01ffb | 577 | session_unlock_list(); |
7a485870 | 578 | |
5eb91c98 | 579 | return 0; |
7a485870 DG |
580 | |
581 | error: | |
54d01ffb | 582 | session_unlock_list(); |
7a485870 DG |
583 | return -1; |
584 | } | |
585 | ||
586 | /* | |
54d01ffb | 587 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 588 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 589 | * |
d063d709 | 590 | * Useful for CPU hotplug feature. |
7a485870 | 591 | */ |
2bdd86d4 | 592 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
593 | { |
594 | int ret = 0; | |
595 | struct ltt_session *session; | |
173af62f | 596 | struct ltt_kernel_session *ksess; |
7a485870 DG |
597 | struct ltt_kernel_channel *channel; |
598 | ||
599 | DBG("Updating kernel streams for channel fd %d", fd); | |
600 | ||
54d01ffb | 601 | session_lock_list(); |
b5541356 | 602 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 603 | session_lock(session); |
7a485870 | 604 | if (session->kernel_session == NULL) { |
54d01ffb | 605 | session_unlock(session); |
7a485870 DG |
606 | continue; |
607 | } | |
173af62f | 608 | ksess = session->kernel_session; |
d9800920 | 609 | |
173af62f | 610 | cds_list_for_each_entry(channel, &ksess->channel_list.head, list) { |
7a485870 DG |
611 | if (channel->fd == fd) { |
612 | DBG("Channel found, updating kernel streams"); | |
613 | ret = kernel_open_channel_stream(channel); | |
614 | if (ret < 0) { | |
b3c750d2 | 615 | goto error; |
7a485870 | 616 | } |
d9800920 | 617 | |
7a485870 | 618 | /* |
5eb91c98 DG |
619 | * Have we already sent fds to the consumer? If yes, it means |
620 | * that tracing is started so it is safe to send our updated | |
621 | * stream fds. | |
7a485870 | 622 | */ |
173af62f DG |
623 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
624 | struct lttng_ht_iter iter; | |
625 | struct consumer_socket *socket; | |
626 | ||
627 | ||
628 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, | |
629 | &iter.iter, socket, node.node) { | |
630 | /* Code flow error */ | |
631 | assert(socket->fd >= 0); | |
632 | ||
633 | pthread_mutex_lock(socket->lock); | |
634 | ret = kernel_consumer_send_channel_stream(socket->fd, | |
635 | channel, ksess); | |
636 | pthread_mutex_unlock(socket->lock); | |
637 | if (ret < 0) { | |
638 | goto error; | |
639 | } | |
7a485870 DG |
640 | } |
641 | } | |
b3c750d2 | 642 | goto error; |
7a485870 DG |
643 | } |
644 | } | |
54d01ffb | 645 | session_unlock(session); |
7a485870 | 646 | } |
54d01ffb | 647 | session_unlock_list(); |
b3c750d2 | 648 | return ret; |
7a485870 | 649 | |
b3c750d2 | 650 | error: |
54d01ffb DG |
651 | session_unlock(session); |
652 | session_unlock_list(); | |
7a485870 DG |
653 | return ret; |
654 | } | |
655 | ||
487cf67c DG |
656 | /* |
657 | * For each tracing session, update newly registered apps. | |
658 | */ | |
659 | static void update_ust_app(int app_sock) | |
660 | { | |
661 | struct ltt_session *sess, *stmp; | |
662 | ||
4ee14516 DG |
663 | session_lock_list(); |
664 | ||
487cf67c DG |
665 | /* For all tracing session(s) */ |
666 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 667 | session_lock(sess); |
421cb601 DG |
668 | if (sess->ust_session) { |
669 | ust_app_global_update(sess->ust_session, app_sock); | |
670 | } | |
4ee14516 | 671 | session_unlock(sess); |
487cf67c | 672 | } |
4ee14516 DG |
673 | |
674 | session_unlock_list(); | |
487cf67c DG |
675 | } |
676 | ||
7a485870 | 677 | /* |
d063d709 | 678 | * This thread manage event coming from the kernel. |
7a485870 | 679 | * |
d063d709 DG |
680 | * Features supported in this thread: |
681 | * -) CPU Hotplug | |
7a485870 DG |
682 | */ |
683 | static void *thread_manage_kernel(void *data) | |
684 | { | |
139ac872 | 685 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 686 | uint32_t revents, nb_fd; |
7a485870 | 687 | char tmp; |
5eb91c98 | 688 | struct lttng_poll_event events; |
7a485870 DG |
689 | |
690 | DBG("Thread manage kernel started"); | |
691 | ||
8ac94142 CB |
692 | testpoint(thread_manage_kernel); |
693 | ||
44a5e5eb DG |
694 | health_code_update(&health_thread_kernel); |
695 | ||
8ac94142 CB |
696 | testpoint(thread_manage_kernel_before_loop); |
697 | ||
5eb91c98 DG |
698 | ret = create_thread_poll_set(&events, 2); |
699 | if (ret < 0) { | |
76d7553f | 700 | goto error_poll_create; |
5eb91c98 DG |
701 | } |
702 | ||
703 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
704 | if (ret < 0) { | |
705 | goto error; | |
706 | } | |
707 | ||
7a485870 | 708 | while (1) { |
44a5e5eb DG |
709 | health_code_update(&health_thread_kernel); |
710 | ||
7a485870 | 711 | if (update_poll_flag == 1) { |
5f822d0a DG |
712 | /* |
713 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
714 | * quit pipe and the kernel pipe. | |
715 | */ | |
716 | events.nb_fd = 2; | |
717 | ||
5eb91c98 DG |
718 | ret = update_kernel_poll(&events); |
719 | if (ret < 0) { | |
7a485870 DG |
720 | goto error; |
721 | } | |
722 | update_poll_flag = 0; | |
723 | } | |
724 | ||
5eb91c98 DG |
725 | nb_fd = LTTNG_POLL_GETNB(&events); |
726 | ||
727 | DBG("Thread kernel polling on %d fds", nb_fd); | |
728 | ||
729 | /* Zeroed the poll events */ | |
730 | lttng_poll_reset(&events); | |
7a485870 DG |
731 | |
732 | /* Poll infinite value of time */ | |
88f2b785 | 733 | restart: |
44a5e5eb | 734 | health_poll_update(&health_thread_kernel); |
5eb91c98 | 735 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 736 | health_poll_update(&health_thread_kernel); |
7a485870 | 737 | if (ret < 0) { |
88f2b785 MD |
738 | /* |
739 | * Restart interrupted system call. | |
740 | */ | |
741 | if (errno == EINTR) { | |
742 | goto restart; | |
743 | } | |
7a485870 DG |
744 | goto error; |
745 | } else if (ret == 0) { | |
746 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
747 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
748 | "This should not have happened! Continuing..."); | |
7a485870 DG |
749 | continue; |
750 | } | |
751 | ||
5eb91c98 DG |
752 | for (i = 0; i < nb_fd; i++) { |
753 | /* Fetch once the poll data */ | |
754 | revents = LTTNG_POLL_GETEV(&events, i); | |
755 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 756 | |
44a5e5eb DG |
757 | health_code_update(&health_thread_kernel); |
758 | ||
5eb91c98 DG |
759 | /* Thread quit pipe has been closed. Killing thread. */ |
760 | ret = check_thread_quit_pipe(pollfd, revents); | |
761 | if (ret) { | |
139ac872 MD |
762 | err = 0; |
763 | goto exit; | |
5eb91c98 | 764 | } |
7a485870 | 765 | |
5eb91c98 DG |
766 | /* Check for data on kernel pipe */ |
767 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
768 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
769 | update_poll_flag = 1; | |
770 | continue; | |
771 | } else { | |
772 | /* | |
773 | * New CPU detected by the kernel. Adding kernel stream to | |
774 | * kernel session and updating the kernel consumer | |
775 | */ | |
776 | if (revents & LPOLLIN) { | |
2bdd86d4 | 777 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
778 | if (ret < 0) { |
779 | continue; | |
780 | } | |
781 | break; | |
782 | /* | |
783 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
784 | * and unregister kernel stream at this point. | |
785 | */ | |
7a485870 | 786 | } |
7a485870 DG |
787 | } |
788 | } | |
789 | } | |
790 | ||
139ac872 | 791 | exit: |
7a485870 | 792 | error: |
5eb91c98 | 793 | lttng_poll_clean(&events); |
76d7553f | 794 | error_poll_create: |
139ac872 MD |
795 | if (err) { |
796 | health_error(&health_thread_kernel); | |
797 | ERR("Health error occurred in %s", __func__); | |
798 | } | |
799 | health_exit(&health_thread_kernel); | |
76d7553f | 800 | DBG("Kernel thread dying"); |
7a485870 DG |
801 | return NULL; |
802 | } | |
803 | ||
a23ec3a7 DG |
804 | /* |
805 | * Signal pthread condition of the consumer data that the thread. | |
806 | */ | |
807 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
808 | { | |
809 | pthread_mutex_lock(&data->cond_mutex); | |
810 | ||
811 | /* | |
812 | * The state is set before signaling. It can be any value, it's the waiter | |
813 | * job to correctly interpret this condition variable associated to the | |
814 | * consumer pthread_cond. | |
815 | * | |
816 | * A value of 0 means that the corresponding thread of the consumer data | |
817 | * was not started. 1 indicates that the thread has started and is ready | |
818 | * for action. A negative value means that there was an error during the | |
819 | * thread bootstrap. | |
820 | */ | |
821 | data->consumer_thread_is_ready = state; | |
822 | (void) pthread_cond_signal(&data->cond); | |
823 | ||
824 | pthread_mutex_unlock(&data->cond_mutex); | |
825 | } | |
826 | ||
1d4b027a | 827 | /* |
3bd1e081 | 828 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 829 | */ |
3bd1e081 | 830 | static void *thread_manage_consumer(void *data) |
1d4b027a | 831 | { |
139ac872 | 832 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 833 | uint32_t revents, nb_fd; |
1d4b027a | 834 | enum lttcomm_return_code code; |
5eb91c98 | 835 | struct lttng_poll_event events; |
3bd1e081 | 836 | struct consumer_data *consumer_data = data; |
1d4b027a | 837 | |
3bd1e081 | 838 | DBG("[thread] Manage consumer started"); |
1d4b027a | 839 | |
44a5e5eb DG |
840 | health_code_update(&consumer_data->health); |
841 | ||
3bd1e081 | 842 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a | 843 | if (ret < 0) { |
76d7553f | 844 | goto error_listen; |
1d4b027a DG |
845 | } |
846 | ||
5eb91c98 DG |
847 | /* |
848 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
849 | * Nothing more will be added to this poll set. | |
850 | */ | |
851 | ret = create_thread_poll_set(&events, 2); | |
852 | if (ret < 0) { | |
76d7553f | 853 | goto error_poll; |
5eb91c98 | 854 | } |
273ea72c | 855 | |
3bd1e081 | 856 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
857 | if (ret < 0) { |
858 | goto error; | |
859 | } | |
860 | ||
861 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c | 862 | |
44a5e5eb DG |
863 | health_code_update(&consumer_data->health); |
864 | ||
273ea72c | 865 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 866 | restart: |
44a5e5eb | 867 | health_poll_update(&consumer_data->health); |
8ac94142 CB |
868 | |
869 | testpoint(thread_manage_consumer); | |
870 | ||
5eb91c98 | 871 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 872 | health_poll_update(&consumer_data->health); |
273ea72c | 873 | if (ret < 0) { |
88f2b785 MD |
874 | /* |
875 | * Restart interrupted system call. | |
876 | */ | |
877 | if (errno == EINTR) { | |
878 | goto restart; | |
879 | } | |
273ea72c DG |
880 | goto error; |
881 | } | |
882 | ||
5eb91c98 DG |
883 | for (i = 0; i < nb_fd; i++) { |
884 | /* Fetch once the poll data */ | |
885 | revents = LTTNG_POLL_GETEV(&events, i); | |
886 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
887 | ||
44a5e5eb DG |
888 | health_code_update(&consumer_data->health); |
889 | ||
5eb91c98 DG |
890 | /* Thread quit pipe has been closed. Killing thread. */ |
891 | ret = check_thread_quit_pipe(pollfd, revents); | |
892 | if (ret) { | |
139ac872 MD |
893 | err = 0; |
894 | goto exit; | |
5eb91c98 DG |
895 | } |
896 | ||
897 | /* Event on the registration socket */ | |
3bd1e081 | 898 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 899 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 900 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
901 | goto error; |
902 | } | |
903 | } | |
273ea72c DG |
904 | } |
905 | ||
3bd1e081 | 906 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
907 | if (sock < 0) { |
908 | goto error; | |
909 | } | |
910 | ||
44a5e5eb DG |
911 | health_code_update(&consumer_data->health); |
912 | ||
3bd1e081 | 913 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 914 | |
712ea556 | 915 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
916 | ret = lttcomm_recv_unix_sock(sock, &code, |
917 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
918 | if (ret <= 0) { |
919 | goto error; | |
920 | } | |
921 | ||
44a5e5eb DG |
922 | health_code_update(&consumer_data->health); |
923 | ||
f73fabfd | 924 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
3bd1e081 MD |
925 | consumer_data->cmd_sock = |
926 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
927 | if (consumer_data->cmd_sock < 0) { | |
a23ec3a7 DG |
928 | /* On error, signal condition and quit. */ |
929 | signal_consumer_condition(consumer_data, -1); | |
48842b30 | 930 | PERROR("consumer connect"); |
1d4b027a DG |
931 | goto error; |
932 | } | |
a23ec3a7 DG |
933 | signal_consumer_condition(consumer_data, 1); |
934 | DBG("Consumer command socket ready"); | |
1d4b027a | 935 | } else { |
3bd1e081 | 936 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
937 | lttcomm_get_readable_code(-code)); |
938 | goto error; | |
939 | } | |
940 | ||
54d01ffb | 941 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 942 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 943 | if (ret < 0) { |
72079cae DG |
944 | goto error; |
945 | } | |
946 | ||
5eb91c98 DG |
947 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
948 | if (ret < 0) { | |
72079cae | 949 | goto error; |
5eb91c98 DG |
950 | } |
951 | ||
44a5e5eb DG |
952 | health_code_update(&consumer_data->health); |
953 | ||
5eb91c98 DG |
954 | /* Update number of fd */ |
955 | nb_fd = LTTNG_POLL_GETNB(&events); | |
956 | ||
957 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 958 | restart_poll: |
44a5e5eb | 959 | health_poll_update(&consumer_data->health); |
5eb91c98 | 960 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 961 | health_poll_update(&consumer_data->health); |
5eb91c98 | 962 | if (ret < 0) { |
88f2b785 MD |
963 | /* |
964 | * Restart interrupted system call. | |
965 | */ | |
966 | if (errno == EINTR) { | |
967 | goto restart_poll; | |
968 | } | |
72079cae DG |
969 | goto error; |
970 | } | |
971 | ||
5eb91c98 DG |
972 | for (i = 0; i < nb_fd; i++) { |
973 | /* Fetch once the poll data */ | |
974 | revents = LTTNG_POLL_GETEV(&events, i); | |
975 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
976 | ||
44a5e5eb DG |
977 | health_code_update(&consumer_data->health); |
978 | ||
5eb91c98 DG |
979 | /* Thread quit pipe has been closed. Killing thread. */ |
980 | ret = check_thread_quit_pipe(pollfd, revents); | |
981 | if (ret) { | |
139ac872 MD |
982 | err = 0; |
983 | goto exit; | |
5eb91c98 DG |
984 | } |
985 | ||
986 | /* Event on the kconsumerd socket */ | |
987 | if (pollfd == sock) { | |
988 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 989 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
990 | goto error; |
991 | } | |
992 | } | |
993 | } | |
994 | ||
44a5e5eb DG |
995 | health_code_update(&consumer_data->health); |
996 | ||
712ea556 | 997 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
998 | ret = lttcomm_recv_unix_sock(sock, &code, |
999 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1000 | if (ret <= 0) { |
3bd1e081 | 1001 | ERR("consumer closed the command socket"); |
712ea556 | 1002 | goto error; |
6f61d021 | 1003 | } |
1d4b027a | 1004 | |
3bd1e081 | 1005 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1006 | |
139ac872 | 1007 | exit: |
1d4b027a | 1008 | error: |
5c827ce0 DG |
1009 | /* Immediately set the consumerd state to stopped */ |
1010 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1011 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1012 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1013 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1014 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1015 | } else { | |
1016 | /* Code flow error... */ | |
1017 | assert(0); | |
1018 | } | |
1019 | ||
76d7553f MD |
1020 | if (consumer_data->err_sock >= 0) { |
1021 | ret = close(consumer_data->err_sock); | |
1022 | if (ret) { | |
1023 | PERROR("close"); | |
1024 | } | |
1025 | } | |
1026 | if (consumer_data->cmd_sock >= 0) { | |
1027 | ret = close(consumer_data->cmd_sock); | |
1028 | if (ret) { | |
1029 | PERROR("close"); | |
1030 | } | |
1031 | } | |
1032 | if (sock >= 0) { | |
1033 | ret = close(sock); | |
1034 | if (ret) { | |
1035 | PERROR("close"); | |
1036 | } | |
1037 | } | |
273ea72c | 1038 | |
3bd1e081 MD |
1039 | unlink(consumer_data->err_unix_sock_path); |
1040 | unlink(consumer_data->cmd_unix_sock_path); | |
1041 | consumer_data->pid = 0; | |
1d4b027a | 1042 | |
5eb91c98 | 1043 | lttng_poll_clean(&events); |
76d7553f MD |
1044 | error_poll: |
1045 | error_listen: | |
139ac872 MD |
1046 | if (err) { |
1047 | health_error(&consumer_data->health); | |
1048 | ERR("Health error occurred in %s", __func__); | |
1049 | } | |
1050 | health_exit(&consumer_data->health); | |
76d7553f | 1051 | DBG("consumer thread cleanup completed"); |
0177d773 | 1052 | |
5eb91c98 | 1053 | return NULL; |
099e26bd DG |
1054 | } |
1055 | ||
099e26bd DG |
1056 | /* |
1057 | * This thread manage application communication. | |
1d4b027a DG |
1058 | */ |
1059 | static void *thread_manage_apps(void *data) | |
099e26bd | 1060 | { |
139ac872 | 1061 | int i, ret, pollfd, err = -1; |
5eb91c98 | 1062 | uint32_t revents, nb_fd; |
099e26bd | 1063 | struct ust_command ust_cmd; |
5eb91c98 | 1064 | struct lttng_poll_event events; |
099e26bd DG |
1065 | |
1066 | DBG("[thread] Manage application started"); | |
1067 | ||
8ac94142 CB |
1068 | testpoint(thread_manage_apps); |
1069 | ||
f6a9efaa DG |
1070 | rcu_register_thread(); |
1071 | rcu_thread_online(); | |
1072 | ||
139ac872 | 1073 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1074 | |
5eb91c98 DG |
1075 | ret = create_thread_poll_set(&events, 2); |
1076 | if (ret < 0) { | |
76d7553f | 1077 | goto error_poll_create; |
5eb91c98 | 1078 | } |
099e26bd | 1079 | |
5eb91c98 DG |
1080 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1081 | if (ret < 0) { | |
1082 | goto error; | |
1083 | } | |
099e26bd | 1084 | |
8ac94142 CB |
1085 | testpoint(thread_manage_apps_before_loop); |
1086 | ||
139ac872 | 1087 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1088 | |
5eb91c98 DG |
1089 | while (1) { |
1090 | /* Zeroed the events structure */ | |
1091 | lttng_poll_reset(&events); | |
0177d773 | 1092 | |
5eb91c98 | 1093 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1094 | |
1095 | DBG("Apps thread polling on %d fds", nb_fd); | |
1096 | ||
1097 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1098 | restart: |
139ac872 | 1099 | health_poll_update(&health_thread_app_manage); |
5eb91c98 | 1100 | ret = lttng_poll_wait(&events, -1); |
139ac872 | 1101 | health_poll_update(&health_thread_app_manage); |
099e26bd | 1102 | if (ret < 0) { |
88f2b785 MD |
1103 | /* |
1104 | * Restart interrupted system call. | |
1105 | */ | |
1106 | if (errno == EINTR) { | |
1107 | goto restart; | |
1108 | } | |
099e26bd DG |
1109 | goto error; |
1110 | } | |
1111 | ||
5eb91c98 DG |
1112 | for (i = 0; i < nb_fd; i++) { |
1113 | /* Fetch once the poll data */ | |
1114 | revents = LTTNG_POLL_GETEV(&events, i); | |
1115 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1116 | ||
139ac872 | 1117 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1118 | |
5eb91c98 DG |
1119 | /* Thread quit pipe has been closed. Killing thread. */ |
1120 | ret = check_thread_quit_pipe(pollfd, revents); | |
1121 | if (ret) { | |
139ac872 MD |
1122 | err = 0; |
1123 | goto exit; | |
5eb91c98 | 1124 | } |
099e26bd | 1125 | |
5eb91c98 DG |
1126 | /* Inspect the apps cmd pipe */ |
1127 | if (pollfd == apps_cmd_pipe[0]) { | |
1128 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1129 | ERR("Apps command pipe error"); | |
0177d773 | 1130 | goto error; |
5eb91c98 DG |
1131 | } else if (revents & LPOLLIN) { |
1132 | /* Empty pipe */ | |
1133 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1134 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
76d7553f | 1135 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1136 | goto error; |
1137 | } | |
099e26bd | 1138 | |
139ac872 | 1139 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1140 | |
5eb91c98 | 1141 | /* Register applicaton to the session daemon */ |
56fff090 | 1142 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1143 | ust_cmd.sock); |
88ff5b7f | 1144 | if (ret == -ENOMEM) { |
5eb91c98 | 1145 | goto error; |
88ff5b7f MD |
1146 | } else if (ret < 0) { |
1147 | break; | |
5eb91c98 DG |
1148 | } |
1149 | ||
139ac872 | 1150 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1151 | |
acc7b41b | 1152 | /* |
e0c7ec2b | 1153 | * Validate UST version compatibility. |
acc7b41b | 1154 | */ |
e0c7ec2b DG |
1155 | ret = ust_app_validate_version(ust_cmd.sock); |
1156 | if (ret >= 0) { | |
1157 | /* | |
1158 | * Add channel(s) and event(s) to newly registered apps | |
1159 | * from lttng global UST domain. | |
1160 | */ | |
1161 | update_ust_app(ust_cmd.sock); | |
1162 | } | |
acc7b41b | 1163 | |
139ac872 | 1164 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1165 | |
f2ca2e25 | 1166 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1167 | if (ret < 0) { |
1168 | /* | |
1169 | * If the registration is not possible, we simply | |
1170 | * unregister the apps and continue | |
1171 | */ | |
56fff090 | 1172 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1173 | } else { |
1174 | /* | |
1175 | * We just need here to monitor the close of the UST | |
1176 | * socket and poll set monitor those by default. | |
a9ade966 MD |
1177 | * Listen on POLLIN (even if we never expect any |
1178 | * data) to ensure that hangup wakes us. | |
5eb91c98 | 1179 | */ |
a9ade966 | 1180 | ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN); |
5eb91c98 DG |
1181 | if (ret < 0) { |
1182 | goto error; | |
1183 | } | |
1184 | ||
54d01ffb DG |
1185 | DBG("Apps with sock %d added to poll set", |
1186 | ust_cmd.sock); | |
5eb91c98 | 1187 | } |
487cf67c | 1188 | |
139ac872 | 1189 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1190 | |
5eb91c98 | 1191 | break; |
0177d773 | 1192 | } |
5eb91c98 DG |
1193 | } else { |
1194 | /* | |
54d01ffb DG |
1195 | * At this point, we know that a registered application made |
1196 | * the event at poll_wait. | |
5eb91c98 DG |
1197 | */ |
1198 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1199 | /* Removing from the poll set */ | |
1200 | ret = lttng_poll_del(&events, pollfd); | |
1201 | if (ret < 0) { | |
1202 | goto error; | |
1203 | } | |
099e26bd | 1204 | |
b9d9b220 | 1205 | /* Socket closed on remote end. */ |
56fff090 | 1206 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1207 | break; |
1208 | } | |
099e26bd | 1209 | } |
44a5e5eb | 1210 | |
139ac872 | 1211 | health_code_update(&health_thread_app_manage); |
099e26bd | 1212 | } |
099e26bd DG |
1213 | } |
1214 | ||
139ac872 | 1215 | exit: |
099e26bd | 1216 | error: |
5eb91c98 | 1217 | lttng_poll_clean(&events); |
76d7553f | 1218 | error_poll_create: |
139ac872 MD |
1219 | if (err) { |
1220 | health_error(&health_thread_app_manage); | |
1221 | ERR("Health error occurred in %s", __func__); | |
1222 | } | |
1223 | health_exit(&health_thread_app_manage); | |
76d7553f | 1224 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1225 | rcu_thread_offline(); |
1226 | rcu_unregister_thread(); | |
099e26bd DG |
1227 | return NULL; |
1228 | } | |
1229 | ||
1230 | /* | |
1231 | * Dispatch request from the registration threads to the application | |
1232 | * communication thread. | |
1233 | */ | |
1234 | static void *thread_dispatch_ust_registration(void *data) | |
1235 | { | |
1236 | int ret; | |
1237 | struct cds_wfq_node *node; | |
1238 | struct ust_command *ust_cmd = NULL; | |
1239 | ||
1240 | DBG("[thread] Dispatch UST command started"); | |
1241 | ||
26c9d55e | 1242 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
099e26bd DG |
1243 | /* Atomically prepare the queue futex */ |
1244 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1245 | ||
1246 | do { | |
1247 | /* Dequeue command for registration */ | |
1248 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1249 | if (node == NULL) { | |
00a17c97 | 1250 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1251 | /* Continue thread execution */ |
1252 | break; | |
1253 | } | |
1254 | ||
1255 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1256 | ||
2f50c8a3 DG |
1257 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1258 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1259 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1260 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1261 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1262 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1263 | /* |
1264 | * Inform apps thread of the new application registration. This | |
1265 | * call is blocking so we can be assured that the data will be read | |
1266 | * at some point in time or wait to the end of the world :) | |
1267 | */ | |
1268 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1269 | sizeof(struct ust_command)); | |
1270 | if (ret < 0) { | |
76d7553f | 1271 | PERROR("write apps cmd pipe"); |
099e26bd DG |
1272 | if (errno == EBADF) { |
1273 | /* | |
1274 | * We can't inform the application thread to process | |
1275 | * registration. We will exit or else application | |
1276 | * registration will not occur and tracing will never | |
1277 | * start. | |
1278 | */ | |
1279 | goto error; | |
1280 | } | |
1281 | } | |
1282 | free(ust_cmd); | |
1283 | } while (node != NULL); | |
1284 | ||
1285 | /* Futex wait on queue. Blocking call on futex() */ | |
1286 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1287 | } | |
1288 | ||
1289 | error: | |
1290 | DBG("Dispatch thread dying"); | |
1291 | return NULL; | |
1292 | } | |
1293 | ||
1294 | /* | |
1295 | * This thread manage application registration. | |
1296 | */ | |
1297 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1298 | { |
139ac872 | 1299 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1300 | uint32_t revents, nb_fd; |
1301 | struct lttng_poll_event events; | |
099e26bd DG |
1302 | /* |
1303 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1304 | * freed in the manage apps thread. | |
1305 | */ | |
1306 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1307 | |
099e26bd | 1308 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1309 | |
8ac94142 CB |
1310 | testpoint(thread_registration_apps); |
1311 | ||
1d4b027a DG |
1312 | ret = lttcomm_listen_unix_sock(apps_sock); |
1313 | if (ret < 0) { | |
76d7553f | 1314 | goto error_listen; |
1d4b027a DG |
1315 | } |
1316 | ||
5eb91c98 DG |
1317 | /* |
1318 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1319 | * more will be added to this poll set. | |
1320 | */ | |
1321 | ret = create_thread_poll_set(&events, 2); | |
1322 | if (ret < 0) { | |
76d7553f | 1323 | goto error_create_poll; |
5eb91c98 | 1324 | } |
273ea72c | 1325 | |
5eb91c98 DG |
1326 | /* Add the application registration socket */ |
1327 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1328 | if (ret < 0) { | |
76d7553f | 1329 | goto error_poll_add; |
5eb91c98 | 1330 | } |
273ea72c | 1331 | |
1d4b027a | 1332 | /* Notify all applications to register */ |
0fdd1e2c DG |
1333 | ret = notify_ust_apps(1); |
1334 | if (ret < 0) { | |
1335 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1336 | "Execution continues but there might be problem for already\n" |
1337 | "running applications that wishes to register."); | |
0fdd1e2c | 1338 | } |
1d4b027a DG |
1339 | |
1340 | while (1) { | |
1341 | DBG("Accepting application registration"); | |
273ea72c | 1342 | |
5eb91c98 DG |
1343 | nb_fd = LTTNG_POLL_GETNB(&events); |
1344 | ||
273ea72c | 1345 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1346 | restart: |
139ac872 | 1347 | health_poll_update(&health_thread_app_reg); |
5eb91c98 | 1348 | ret = lttng_poll_wait(&events, -1); |
139ac872 | 1349 | health_poll_update(&health_thread_app_reg); |
273ea72c | 1350 | if (ret < 0) { |
88f2b785 MD |
1351 | /* |
1352 | * Restart interrupted system call. | |
1353 | */ | |
1354 | if (errno == EINTR) { | |
1355 | goto restart; | |
1356 | } | |
273ea72c DG |
1357 | goto error; |
1358 | } | |
1359 | ||
5eb91c98 | 1360 | for (i = 0; i < nb_fd; i++) { |
139ac872 MD |
1361 | health_code_update(&health_thread_app_reg); |
1362 | ||
5eb91c98 DG |
1363 | /* Fetch once the poll data */ |
1364 | revents = LTTNG_POLL_GETEV(&events, i); | |
1365 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1366 | |
5eb91c98 DG |
1367 | /* Thread quit pipe has been closed. Killing thread. */ |
1368 | ret = check_thread_quit_pipe(pollfd, revents); | |
1369 | if (ret) { | |
139ac872 MD |
1370 | err = 0; |
1371 | goto exit; | |
90014c57 | 1372 | } |
1d4b027a | 1373 | |
5eb91c98 DG |
1374 | /* Event on the registration socket */ |
1375 | if (pollfd == apps_sock) { | |
1376 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1377 | ERR("Register apps socket poll error"); | |
1378 | goto error; | |
1379 | } else if (revents & LPOLLIN) { | |
1380 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1381 | if (sock < 0) { | |
1382 | goto error; | |
1383 | } | |
099e26bd | 1384 | |
5eb91c98 | 1385 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1386 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1387 | if (ust_cmd == NULL) { |
76d7553f | 1388 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1389 | goto error; |
1390 | } | |
1d4b027a | 1391 | |
5eb91c98 DG |
1392 | /* |
1393 | * Using message-based transmissions to ensure we don't | |
1394 | * have to deal with partially received messages. | |
1395 | */ | |
4063050c MD |
1396 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1397 | if (ret < 0) { | |
1398 | ERR("Exhausted file descriptors allowed for applications."); | |
1399 | free(ust_cmd); | |
1400 | ret = close(sock); | |
1401 | if (ret) { | |
1402 | PERROR("close"); | |
1403 | } | |
1404 | sock = -1; | |
1405 | continue; | |
1406 | } | |
139ac872 | 1407 | health_code_update(&health_thread_app_reg); |
5eb91c98 DG |
1408 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1409 | sizeof(struct ust_register_msg)); | |
1410 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1411 | if (ret < 0) { | |
76d7553f | 1412 | PERROR("lttcomm_recv_unix_sock register apps"); |
5eb91c98 DG |
1413 | } else { |
1414 | ERR("Wrong size received on apps register"); | |
1415 | } | |
1416 | free(ust_cmd); | |
76d7553f MD |
1417 | ret = close(sock); |
1418 | if (ret) { | |
1419 | PERROR("close"); | |
1420 | } | |
4063050c | 1421 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1422 | sock = -1; |
5eb91c98 DG |
1423 | continue; |
1424 | } | |
139ac872 | 1425 | health_code_update(&health_thread_app_reg); |
099e26bd | 1426 | |
5eb91c98 | 1427 | ust_cmd->sock = sock; |
34a2494f | 1428 | sock = -1; |
099e26bd | 1429 | |
5eb91c98 DG |
1430 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1431 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1432 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1433 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1434 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1435 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1436 | |
5eb91c98 DG |
1437 | /* |
1438 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1439 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1440 | */ |
1441 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1442 | ||
1443 | /* | |
1444 | * Wake the registration queue futex. Implicit memory | |
1445 | * barrier with the exchange in cds_wfq_enqueue. | |
1446 | */ | |
1447 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1448 | } | |
1449 | } | |
90014c57 | 1450 | } |
1d4b027a DG |
1451 | } |
1452 | ||
139ac872 | 1453 | exit: |
1d4b027a | 1454 | error: |
139ac872 MD |
1455 | if (err) { |
1456 | health_error(&health_thread_app_reg); | |
1457 | ERR("Health error occurred in %s", __func__); | |
1458 | } | |
1459 | health_exit(&health_thread_app_reg); | |
1460 | ||
0fdd1e2c DG |
1461 | /* Notify that the registration thread is gone */ |
1462 | notify_ust_apps(0); | |
1463 | ||
a4b35e07 | 1464 | if (apps_sock >= 0) { |
76d7553f MD |
1465 | ret = close(apps_sock); |
1466 | if (ret) { | |
1467 | PERROR("close"); | |
1468 | } | |
a4b35e07 | 1469 | } |
46c3f085 | 1470 | if (sock >= 0) { |
76d7553f MD |
1471 | ret = close(sock); |
1472 | if (ret) { | |
1473 | PERROR("close"); | |
1474 | } | |
4063050c | 1475 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1476 | } |
273ea72c | 1477 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1478 | |
76d7553f | 1479 | error_poll_add: |
5eb91c98 | 1480 | lttng_poll_clean(&events); |
76d7553f MD |
1481 | error_listen: |
1482 | error_create_poll: | |
1483 | DBG("UST Registration thread cleanup complete"); | |
5eb91c98 | 1484 | |
1d4b027a DG |
1485 | return NULL; |
1486 | } | |
1487 | ||
8c0faa1d | 1488 | /* |
3bd1e081 | 1489 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1490 | * exec or it will fails. |
8c0faa1d | 1491 | */ |
3bd1e081 | 1492 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 1493 | { |
a23ec3a7 | 1494 | int ret, clock_ret; |
ee0b0061 DG |
1495 | struct timespec timeout; |
1496 | ||
a23ec3a7 DG |
1497 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
1498 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 1499 | |
a23ec3a7 DG |
1500 | /* Setup pthread condition */ |
1501 | ret = pthread_condattr_init(&consumer_data->condattr); | |
1502 | if (ret != 0) { | |
1503 | errno = ret; | |
1504 | PERROR("pthread_condattr_init consumer data"); | |
1505 | goto error; | |
1506 | } | |
1507 | ||
1508 | /* | |
1509 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
1510 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
1511 | * for a more details and how we noticed it. | |
1512 | */ | |
1513 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
1514 | if (ret != 0) { | |
1515 | errno = ret; | |
1516 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
1517 | goto error; |
1518 | } | |
8c0faa1d | 1519 | |
a23ec3a7 DG |
1520 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
1521 | if (ret != 0) { | |
1522 | errno = ret; | |
1523 | PERROR("pthread_cond_init consumer data"); | |
1524 | goto error; | |
1525 | } | |
1526 | ||
1527 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
1528 | consumer_data); | |
8c0faa1d | 1529 | if (ret != 0) { |
3bd1e081 | 1530 | PERROR("pthread_create consumer"); |
ee0b0061 | 1531 | ret = -1; |
8c0faa1d DG |
1532 | goto error; |
1533 | } | |
1534 | ||
a23ec3a7 DG |
1535 | /* We are about to wait on a pthread condition */ |
1536 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
1537 | ||
ee0b0061 | 1538 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
1539 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
1540 | /* | |
1541 | * Set the timeout for the condition timed wait even if the clock gettime | |
1542 | * call fails since we might loop on that call and we want to avoid to | |
1543 | * increment the timeout too many times. | |
1544 | */ | |
1545 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
1546 | ||
1547 | /* | |
1548 | * The following loop COULD be skipped in some conditions so this is why we | |
1549 | * set ret to 0 in order to make sure at least one round of the loop is | |
1550 | * done. | |
1551 | */ | |
1552 | ret = 0; | |
1553 | ||
1554 | /* | |
1555 | * Loop until the condition is reached or when a timeout is reached. Note | |
1556 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
1557 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
1558 | * possible. This loop does not take any chances and works with both of | |
1559 | * them. | |
1560 | */ | |
1561 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
1562 | if (clock_ret < 0) { | |
1563 | PERROR("clock_gettime spawn consumer"); | |
1564 | /* Infinite wait for the consumerd thread to be ready */ | |
1565 | ret = pthread_cond_wait(&consumer_data->cond, | |
1566 | &consumer_data->cond_mutex); | |
1567 | } else { | |
1568 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
1569 | &consumer_data->cond_mutex, &timeout); | |
1570 | } | |
ee0b0061 | 1571 | } |
8c0faa1d | 1572 | |
a23ec3a7 DG |
1573 | /* Release the pthread condition */ |
1574 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
1575 | ||
1576 | if (ret != 0) { | |
1577 | errno = ret; | |
1578 | if (ret == ETIMEDOUT) { | |
ee0b0061 DG |
1579 | /* |
1580 | * Call has timed out so we kill the kconsumerd_thread and return | |
1581 | * an error. | |
1582 | */ | |
a23ec3a7 DG |
1583 | ERR("Condition timed out. The consumer thread was never ready." |
1584 | " Killing it"); | |
3bd1e081 | 1585 | ret = pthread_cancel(consumer_data->thread); |
ee0b0061 | 1586 | if (ret < 0) { |
3bd1e081 | 1587 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1588 | } |
1589 | } else { | |
a23ec3a7 | 1590 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 DG |
1591 | } |
1592 | goto error; | |
1593 | } | |
1594 | ||
3bd1e081 MD |
1595 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1596 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 1597 | ERR("Consumerd did not start"); |
3bd1e081 | 1598 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1599 | goto error; |
1600 | } | |
3bd1e081 | 1601 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1602 | |
8c0faa1d DG |
1603 | return 0; |
1604 | ||
1605 | error: | |
1606 | return ret; | |
1607 | } | |
1608 | ||
d9800920 | 1609 | /* |
3bd1e081 | 1610 | * Join consumer thread |
d9800920 | 1611 | */ |
3bd1e081 | 1612 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1613 | { |
1614 | void *status; | |
1615 | int ret; | |
1616 | ||
e8209f6b DG |
1617 | /* Consumer pid must be a real one. */ |
1618 | if (consumer_data->pid > 0) { | |
3bd1e081 | 1619 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 1620 | if (ret) { |
3bd1e081 | 1621 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1622 | return ret; |
1623 | } | |
3bd1e081 | 1624 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1625 | } else { |
1626 | return 0; | |
1627 | } | |
1628 | } | |
1629 | ||
8c0faa1d | 1630 | /* |
3bd1e081 | 1631 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1632 | * |
d063d709 | 1633 | * Return pid if successful else -1. |
8c0faa1d | 1634 | */ |
3bd1e081 | 1635 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1636 | { |
1637 | int ret; | |
1638 | pid_t pid; | |
94c55f17 | 1639 | const char *consumer_to_use; |
53086306 | 1640 | const char *verbosity; |
94c55f17 | 1641 | struct stat st; |
8c0faa1d | 1642 | |
3bd1e081 | 1643 | DBG("Spawning consumerd"); |
c49dc785 | 1644 | |
8c0faa1d DG |
1645 | pid = fork(); |
1646 | if (pid == 0) { | |
1647 | /* | |
3bd1e081 | 1648 | * Exec consumerd. |
8c0faa1d | 1649 | */ |
daee5345 | 1650 | if (opt_verbose_consumer) { |
53086306 DG |
1651 | verbosity = "--verbose"; |
1652 | } else { | |
1653 | verbosity = "--quiet"; | |
1654 | } | |
3bd1e081 MD |
1655 | switch (consumer_data->type) { |
1656 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1657 | /* |
c7704d57 DG |
1658 | * Find out which consumerd to execute. We will first try the |
1659 | * 64-bit path, then the sessiond's installation directory, and | |
1660 | * fallback on the 32-bit one, | |
94c55f17 | 1661 | */ |
63a799e8 AM |
1662 | DBG3("Looking for a kernel consumer at these locations:"); |
1663 | DBG3(" 1) %s", consumerd64_bin); | |
1664 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1665 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1666 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1667 | DBG3("Found location #1"); |
94c55f17 | 1668 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1669 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1670 | DBG3("Found location #2"); |
94c55f17 | 1671 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1672 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1673 | DBG3("Found location #3"); |
eb1e0bd4 | 1674 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1675 | } else { |
63a799e8 | 1676 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1677 | break; |
1678 | } | |
1679 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1680 | execl(consumer_to_use, | |
1681 | "lttng-consumerd", verbosity, "-k", | |
1682 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1683 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1684 | NULL); | |
3bd1e081 | 1685 | break; |
7753dea8 MD |
1686 | case LTTNG_CONSUMER64_UST: |
1687 | { | |
b1e0b6b6 | 1688 | char *tmpnew = NULL; |
8f4905da MD |
1689 | |
1690 | if (consumerd64_libdir[0] != '\0') { | |
1691 | char *tmp; | |
1692 | size_t tmplen; | |
1693 | ||
1694 | tmp = getenv("LD_LIBRARY_PATH"); | |
1695 | if (!tmp) { | |
1696 | tmp = ""; | |
1697 | } | |
1698 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1699 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1700 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1701 | if (!tmpnew) { | |
1702 | ret = -ENOMEM; | |
1703 | goto error; | |
1704 | } | |
1705 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1706 | strcat(tmpnew, consumerd64_libdir); | |
1707 | if (tmp[0] != '\0') { | |
1708 | strcat(tmpnew, ":"); | |
1709 | strcat(tmpnew, tmp); | |
1710 | } | |
1711 | ret = putenv(tmpnew); | |
1712 | if (ret) { | |
1713 | ret = -errno; | |
1714 | goto error; | |
1715 | } | |
1716 | } | |
94c55f17 | 1717 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1718 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1719 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1720 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1721 | NULL); | |
8f4905da MD |
1722 | if (consumerd64_libdir[0] != '\0') { |
1723 | free(tmpnew); | |
1724 | } | |
1725 | if (ret) { | |
1726 | goto error; | |
1727 | } | |
3bd1e081 | 1728 | break; |
7753dea8 MD |
1729 | } |
1730 | case LTTNG_CONSUMER32_UST: | |
1731 | { | |
937dde8e | 1732 | char *tmpnew = NULL; |
8f4905da MD |
1733 | |
1734 | if (consumerd32_libdir[0] != '\0') { | |
1735 | char *tmp; | |
1736 | size_t tmplen; | |
1737 | ||
1738 | tmp = getenv("LD_LIBRARY_PATH"); | |
1739 | if (!tmp) { | |
1740 | tmp = ""; | |
1741 | } | |
1742 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1743 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1744 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1745 | if (!tmpnew) { | |
1746 | ret = -ENOMEM; | |
1747 | goto error; | |
1748 | } | |
1749 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1750 | strcat(tmpnew, consumerd32_libdir); | |
1751 | if (tmp[0] != '\0') { | |
1752 | strcat(tmpnew, ":"); | |
1753 | strcat(tmpnew, tmp); | |
1754 | } | |
1755 | ret = putenv(tmpnew); | |
1756 | if (ret) { | |
1757 | ret = -errno; | |
1758 | goto error; | |
1759 | } | |
1760 | } | |
94c55f17 | 1761 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1762 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1763 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1764 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1765 | NULL); | |
8f4905da MD |
1766 | if (consumerd32_libdir[0] != '\0') { |
1767 | free(tmpnew); | |
1768 | } | |
1769 | if (ret) { | |
1770 | goto error; | |
1771 | } | |
7753dea8 MD |
1772 | break; |
1773 | } | |
3bd1e081 | 1774 | default: |
76d7553f | 1775 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1776 | exit(EXIT_FAILURE); |
1777 | } | |
8c0faa1d | 1778 | if (errno != 0) { |
76d7553f | 1779 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1780 | } |
1781 | exit(EXIT_FAILURE); | |
1782 | } else if (pid > 0) { | |
1783 | ret = pid; | |
8c0faa1d | 1784 | } else { |
76d7553f | 1785 | PERROR("start consumer fork"); |
8c0faa1d | 1786 | ret = -errno; |
8c0faa1d | 1787 | } |
8f4905da | 1788 | error: |
8c0faa1d DG |
1789 | return ret; |
1790 | } | |
1791 | ||
693bd40b | 1792 | /* |
3bd1e081 | 1793 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1794 | */ |
3bd1e081 | 1795 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1796 | { |
1797 | int ret; | |
1798 | ||
3bd1e081 MD |
1799 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1800 | if (consumer_data->pid != 0) { | |
1801 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1802 | goto end; |
1803 | } | |
693bd40b | 1804 | |
3bd1e081 | 1805 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1806 | if (ret < 0) { |
3bd1e081 MD |
1807 | ERR("Spawning consumerd failed"); |
1808 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1809 | goto error; |
693bd40b | 1810 | } |
c49dc785 | 1811 | |
3bd1e081 MD |
1812 | /* Setting up the consumer_data pid */ |
1813 | consumer_data->pid = ret; | |
48842b30 | 1814 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1815 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1816 | |
3bd1e081 MD |
1817 | DBG2("Spawning consumer control thread"); |
1818 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1819 | if (ret < 0) { |
3bd1e081 | 1820 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1821 | goto error; |
1822 | } | |
1823 | ||
c49dc785 | 1824 | end: |
693bd40b DG |
1825 | return 0; |
1826 | ||
1827 | error: | |
1828 | return ret; | |
1829 | } | |
1830 | ||
44a5e5eb | 1831 | /* |
139ac872 MD |
1832 | * Compute health status of each consumer. If one of them is zero (bad |
1833 | * state), we return 0. | |
44a5e5eb DG |
1834 | */ |
1835 | static int check_consumer_health(void) | |
1836 | { | |
1837 | int ret; | |
1838 | ||
139ac872 MD |
1839 | ret = health_check_state(&kconsumer_data.health) && |
1840 | health_check_state(&ustconsumer32_data.health) && | |
44a5e5eb DG |
1841 | health_check_state(&ustconsumer64_data.health); |
1842 | ||
1843 | DBG3("Health consumer check %d", ret); | |
1844 | ||
1845 | return ret; | |
1846 | } | |
1847 | ||
b73401da | 1848 | /* |
096102bd | 1849 | * Setup necessary data for kernel tracer action. |
b73401da | 1850 | */ |
096102bd | 1851 | static int init_kernel_tracer(void) |
b73401da DG |
1852 | { |
1853 | int ret; | |
b73401da | 1854 | |
096102bd DG |
1855 | /* Modprobe lttng kernel modules */ |
1856 | ret = modprobe_lttng_control(); | |
b73401da | 1857 | if (ret < 0) { |
b73401da DG |
1858 | goto error; |
1859 | } | |
1860 | ||
096102bd DG |
1861 | /* Open debugfs lttng */ |
1862 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1863 | if (kernel_tracer_fd < 0) { | |
1864 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
1865 | ret = -1; |
1866 | goto error_open; | |
54d01ffb DG |
1867 | } |
1868 | ||
2f77fc4b DG |
1869 | /* Validate kernel version */ |
1870 | ret = kernel_validate_version(kernel_tracer_fd); | |
1871 | if (ret < 0) { | |
1872 | goto error_version; | |
b551a063 | 1873 | } |
54d01ffb | 1874 | |
2f77fc4b DG |
1875 | ret = modprobe_lttng_data(); |
1876 | if (ret < 0) { | |
1877 | goto error_modules; | |
54d01ffb DG |
1878 | } |
1879 | ||
2f77fc4b DG |
1880 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
1881 | return 0; | |
1882 | ||
1883 | error_version: | |
1884 | modprobe_remove_lttng_control(); | |
1885 | ret = close(kernel_tracer_fd); | |
1886 | if (ret) { | |
1887 | PERROR("close"); | |
b551a063 | 1888 | } |
2f77fc4b | 1889 | kernel_tracer_fd = -1; |
f73fabfd | 1890 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 1891 | |
2f77fc4b DG |
1892 | error_modules: |
1893 | ret = close(kernel_tracer_fd); | |
1894 | if (ret) { | |
1895 | PERROR("close"); | |
b551a063 | 1896 | } |
54d01ffb | 1897 | |
2f77fc4b DG |
1898 | error_open: |
1899 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
1900 | |
1901 | error: | |
2f77fc4b DG |
1902 | WARN("No kernel tracer available"); |
1903 | kernel_tracer_fd = -1; | |
1904 | if (!is_root) { | |
f73fabfd | 1905 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 1906 | } else { |
f73fabfd | 1907 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 1908 | } |
54d01ffb DG |
1909 | } |
1910 | ||
2f77fc4b | 1911 | |
54d01ffb | 1912 | /* |
2f77fc4b DG |
1913 | * Copy consumer output from the tracing session to the domain session. The |
1914 | * function also applies the right modification on a per domain basis for the | |
1915 | * trace files destination directory. | |
54d01ffb | 1916 | */ |
2f77fc4b | 1917 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
1918 | { |
1919 | int ret; | |
2f77fc4b DG |
1920 | const char *dir_name; |
1921 | struct consumer_output *consumer; | |
1922 | ||
1923 | assert(session); | |
1924 | assert(session->consumer); | |
54d01ffb | 1925 | |
b551a063 DG |
1926 | switch (domain) { |
1927 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b DG |
1928 | DBG3("Copying tracing session consumer output in kernel session"); |
1929 | session->kernel_session->consumer = | |
1930 | consumer_copy_output(session->consumer); | |
1931 | /* Ease our life a bit for the next part */ | |
1932 | consumer = session->kernel_session->consumer; | |
1933 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 DG |
1934 | break; |
1935 | case LTTNG_DOMAIN_UST: | |
2f77fc4b DG |
1936 | DBG3("Copying tracing session consumer output in UST session"); |
1937 | session->ust_session->consumer = | |
1938 | consumer_copy_output(session->consumer); | |
1939 | /* Ease our life a bit for the next part */ | |
1940 | consumer = session->ust_session->consumer; | |
1941 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
1942 | break; |
1943 | default: | |
f73fabfd | 1944 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
1945 | goto error; |
1946 | } | |
1947 | ||
2f77fc4b | 1948 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
1949 | strncat(consumer->subdir, dir_name, |
1950 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
1951 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
1952 | ||
f73fabfd | 1953 | ret = LTTNG_OK; |
54d01ffb DG |
1954 | |
1955 | error: | |
1956 | return ret; | |
1957 | } | |
1958 | ||
00e2e675 | 1959 | /* |
2f77fc4b | 1960 | * Create an UST session and add it to the session ust list. |
00e2e675 | 1961 | */ |
2f77fc4b DG |
1962 | static int create_ust_session(struct ltt_session *session, |
1963 | struct lttng_domain *domain) | |
00e2e675 DG |
1964 | { |
1965 | int ret; | |
2f77fc4b | 1966 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 1967 | |
a4b92340 | 1968 | assert(session); |
2f77fc4b DG |
1969 | assert(domain); |
1970 | assert(session->consumer); | |
a4b92340 | 1971 | |
2f77fc4b DG |
1972 | switch (domain->type) { |
1973 | case LTTNG_DOMAIN_UST: | |
1974 | break; | |
1975 | default: | |
1976 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 1977 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
1978 | goto error; |
1979 | } | |
1980 | ||
2f77fc4b DG |
1981 | DBG("Creating UST session"); |
1982 | ||
1983 | lus = trace_ust_create_session(session->path, session->id, domain); | |
1984 | if (lus == NULL) { | |
f73fabfd | 1985 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
1986 | goto error; |
1987 | } | |
1988 | ||
2f77fc4b DG |
1989 | lus->uid = session->uid; |
1990 | lus->gid = session->gid; | |
1991 | session->ust_session = lus; | |
00e2e675 | 1992 | |
2f77fc4b DG |
1993 | /* Copy session output to the newly created UST session */ |
1994 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 1995 | if (ret != LTTNG_OK) { |
00e2e675 DG |
1996 | goto error; |
1997 | } | |
1998 | ||
f73fabfd | 1999 | return LTTNG_OK; |
00e2e675 DG |
2000 | |
2001 | error: | |
2f77fc4b DG |
2002 | free(lus); |
2003 | session->ust_session = NULL; | |
00e2e675 DG |
2004 | return ret; |
2005 | } | |
2006 | ||
2007 | /* | |
2f77fc4b | 2008 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2009 | */ |
2f77fc4b | 2010 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2011 | { |
2012 | int ret; | |
a4b92340 | 2013 | |
2f77fc4b | 2014 | DBG("Creating kernel session"); |
00e2e675 | 2015 | |
2f77fc4b DG |
2016 | ret = kernel_create_session(session, kernel_tracer_fd); |
2017 | if (ret < 0) { | |
f73fabfd | 2018 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2019 | goto error; |
2020 | } | |
2021 | ||
2f77fc4b DG |
2022 | /* Code flow safety */ |
2023 | assert(session->kernel_session); | |
2024 | ||
2025 | /* Copy session output to the newly created Kernel session */ | |
2026 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2027 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2028 | goto error; |
2029 | } | |
2030 | ||
2f77fc4b DG |
2031 | /* Create directory(ies) on local filesystem. */ |
2032 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2033 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2034 | ret = run_as_mkdir_recursive( | |
2035 | session->kernel_session->consumer->dst.trace_path, | |
2036 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2037 | if (ret < 0) { | |
2038 | if (ret != -EEXIST) { | |
2039 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2040 | goto error; |
2041 | } | |
00e2e675 | 2042 | } |
2f77fc4b | 2043 | } |
00e2e675 | 2044 | |
2f77fc4b DG |
2045 | session->kernel_session->uid = session->uid; |
2046 | session->kernel_session->gid = session->gid; | |
00e2e675 | 2047 | |
f73fabfd | 2048 | return LTTNG_OK; |
00e2e675 | 2049 | |
2f77fc4b DG |
2050 | error: |
2051 | trace_kernel_destroy_session(session->kernel_session); | |
2052 | session->kernel_session = NULL; | |
2053 | return ret; | |
2054 | } | |
00e2e675 | 2055 | |
2f77fc4b DG |
2056 | /* |
2057 | * Count number of session permitted by uid/gid. | |
2058 | */ | |
2059 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2060 | { | |
2061 | unsigned int i = 0; | |
2062 | struct ltt_session *session; | |
07424f16 | 2063 | |
2f77fc4b DG |
2064 | DBG("Counting number of available session for UID %d GID %d", |
2065 | uid, gid); | |
2066 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2067 | /* |
2f77fc4b | 2068 | * Only list the sessions the user can control. |
00e2e675 | 2069 | */ |
2f77fc4b DG |
2070 | if (!session_access_ok(session, uid, gid)) { |
2071 | continue; | |
2072 | } | |
2073 | i++; | |
a4b92340 | 2074 | } |
2f77fc4b | 2075 | return i; |
00e2e675 DG |
2076 | } |
2077 | ||
54d01ffb DG |
2078 | /* |
2079 | * Process the command requested by the lttng client within the command | |
2080 | * context structure. This function make sure that the return structure (llm) | |
2081 | * is set and ready for transmission before returning. | |
2082 | * | |
2083 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2084 | * |
2085 | * "sock" is only used for special-case var. len data. | |
54d01ffb | 2086 | */ |
53a80697 MD |
2087 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2088 | int *sock_error) | |
54d01ffb | 2089 | { |
f73fabfd | 2090 | int ret = LTTNG_OK; |
44d3bd01 | 2091 | int need_tracing_session = 1; |
2e09ba09 | 2092 | int need_domain; |
54d01ffb DG |
2093 | |
2094 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2095 | ||
53a80697 MD |
2096 | *sock_error = 0; |
2097 | ||
2e09ba09 MD |
2098 | switch (cmd_ctx->lsm->cmd_type) { |
2099 | case LTTNG_CREATE_SESSION: | |
2100 | case LTTNG_DESTROY_SESSION: | |
2101 | case LTTNG_LIST_SESSIONS: | |
2102 | case LTTNG_LIST_DOMAINS: | |
2103 | case LTTNG_START_TRACE: | |
2104 | case LTTNG_STOP_TRACE: | |
806e2684 | 2105 | case LTTNG_DATA_AVAILABLE: |
2e09ba09 | 2106 | need_domain = 0; |
3aace903 | 2107 | break; |
2e09ba09 MD |
2108 | default: |
2109 | need_domain = 1; | |
2110 | } | |
2111 | ||
2112 | if (opt_no_kernel && need_domain | |
2113 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2114 | if (!is_root) { |
f73fabfd | 2115 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2116 | } else { |
f73fabfd | 2117 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2118 | } |
4fba7219 DG |
2119 | goto error; |
2120 | } | |
2121 | ||
8d3113b2 DG |
2122 | /* Deny register consumer if we already have a spawned consumer. */ |
2123 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2124 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2125 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2126 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2127 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2128 | goto error; |
2129 | } | |
2130 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2131 | } | |
2132 | ||
54d01ffb DG |
2133 | /* |
2134 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2135 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2136 | * command. |
2137 | */ | |
2138 | switch(cmd_ctx->lsm->cmd_type) { | |
2139 | case LTTNG_LIST_SESSIONS: | |
2140 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2141 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2142 | case LTTNG_LIST_DOMAINS: |
2143 | case LTTNG_LIST_CHANNELS: | |
2144 | case LTTNG_LIST_EVENTS: | |
2145 | break; | |
2146 | default: | |
2147 | /* Setup lttng message with no payload */ | |
2148 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2149 | if (ret < 0) { | |
2150 | /* This label does not try to unlock the session */ | |
2151 | goto init_setup_error; | |
2152 | } | |
2153 | } | |
2154 | ||
2155 | /* Commands that DO NOT need a session. */ | |
2156 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2157 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 2158 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2159 | case LTTNG_LIST_SESSIONS: |
2160 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2161 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2162 | need_tracing_session = 0; |
54d01ffb DG |
2163 | break; |
2164 | default: | |
2165 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2166 | /* |
2167 | * We keep the session list lock across _all_ commands | |
2168 | * for now, because the per-session lock does not | |
2169 | * handle teardown properly. | |
2170 | */ | |
74babd95 | 2171 | session_lock_list(); |
54d01ffb DG |
2172 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2173 | if (cmd_ctx->session == NULL) { | |
2174 | if (cmd_ctx->lsm->session.name != NULL) { | |
f73fabfd | 2175 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2176 | } else { |
2177 | /* If no session name specified */ | |
f73fabfd | 2178 | ret = LTTNG_ERR_SELECT_SESS; |
54d01ffb DG |
2179 | } |
2180 | goto error; | |
2181 | } else { | |
2182 | /* Acquire lock for the session */ | |
2183 | session_lock(cmd_ctx->session); | |
2184 | } | |
2185 | break; | |
2186 | } | |
b389abbe | 2187 | |
2e09ba09 MD |
2188 | if (!need_domain) { |
2189 | goto skip_domain; | |
2190 | } | |
a4b92340 | 2191 | |
54d01ffb DG |
2192 | /* |
2193 | * Check domain type for specific "pre-action". | |
2194 | */ | |
2195 | switch (cmd_ctx->lsm->domain.type) { | |
2196 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2197 | if (!is_root) { |
f73fabfd | 2198 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2199 | goto error; |
2200 | } | |
2201 | ||
54d01ffb | 2202 | /* Kernel tracer check */ |
a4b35e07 | 2203 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2204 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2205 | ret = init_kernel_tracer(); |
2206 | if (ret != 0) { | |
54d01ffb DG |
2207 | goto error; |
2208 | } | |
2209 | } | |
5eb91c98 | 2210 | |
5c827ce0 DG |
2211 | /* Consumer is in an ERROR state. Report back to client */ |
2212 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2213 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2214 | goto error; |
2215 | } | |
2216 | ||
54d01ffb | 2217 | /* Need a session for kernel command */ |
44d3bd01 | 2218 | if (need_tracing_session) { |
54d01ffb | 2219 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2220 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2221 | if (ret < 0) { |
f73fabfd | 2222 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2223 | goto error; |
2224 | } | |
b389abbe | 2225 | } |
7d29a247 | 2226 | |
54d01ffb | 2227 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2228 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2229 | if (kconsumer_data.pid == 0 && | |
a4b92340 DG |
2230 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2231 | cmd_ctx->session->start_consumer) { | |
3bd1e081 MD |
2232 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2233 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2234 | if (ret < 0) { |
f73fabfd | 2235 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2236 | goto error; |
950131af | 2237 | } |
5c827ce0 | 2238 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2239 | } else { |
2240 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2241 | } |
173af62f | 2242 | |
a4b92340 DG |
2243 | /* |
2244 | * The consumer was just spawned so we need to add the socket to | |
2245 | * the consumer output of the session if exist. | |
2246 | */ | |
2247 | ret = consumer_create_socket(&kconsumer_data, | |
2248 | cmd_ctx->session->kernel_session->consumer); | |
2249 | if (ret < 0) { | |
2250 | goto error; | |
173af62f | 2251 | } |
0d0c377a | 2252 | } |
5c827ce0 | 2253 | |
54d01ffb | 2254 | break; |
2bdd86d4 | 2255 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2256 | { |
5c827ce0 DG |
2257 | /* Consumer is in an ERROR state. Report back to client */ |
2258 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2259 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2260 | goto error; |
2261 | } | |
2262 | ||
44d3bd01 | 2263 | if (need_tracing_session) { |
a4b92340 | 2264 | /* Create UST session if none exist. */ |
f6a9efaa | 2265 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2266 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2267 | &cmd_ctx->lsm->domain); |
f73fabfd | 2268 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2269 | goto error; |
2270 | } | |
2271 | } | |
00e2e675 | 2272 | |
7753dea8 MD |
2273 | /* Start the UST consumer daemons */ |
2274 | /* 64-bit */ | |
2275 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2276 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2277 | ustconsumer64_data.pid == 0 && |
a4b92340 DG |
2278 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2279 | cmd_ctx->session->start_consumer) { | |
7753dea8 MD |
2280 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2281 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2282 | if (ret < 0) { |
f73fabfd | 2283 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2284 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2285 | goto error; |
2286 | } | |
48842b30 | 2287 | |
173af62f | 2288 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2289 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2290 | } else { |
7753dea8 MD |
2291 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2292 | } | |
173af62f DG |
2293 | |
2294 | /* | |
2295 | * Setup socket for consumer 64 bit. No need for atomic access | |
2296 | * since it was set above and can ONLY be set in this thread. | |
2297 | */ | |
a4b92340 DG |
2298 | ret = consumer_create_socket(&ustconsumer64_data, |
2299 | cmd_ctx->session->ust_session->consumer); | |
2300 | if (ret < 0) { | |
2301 | goto error; | |
173af62f DG |
2302 | } |
2303 | ||
7753dea8 | 2304 | /* 32-bit */ |
fc7a59ce | 2305 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2306 | ustconsumer32_data.pid == 0 && |
a4b92340 DG |
2307 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2308 | cmd_ctx->session->start_consumer) { | |
7753dea8 MD |
2309 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2310 | ret = start_consumerd(&ustconsumer32_data); | |
2311 | if (ret < 0) { | |
f73fabfd | 2312 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2313 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2314 | goto error; |
2315 | } | |
5c827ce0 | 2316 | |
173af62f | 2317 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2318 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2319 | } else { |
2320 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2321 | } |
173af62f DG |
2322 | |
2323 | /* | |
2324 | * Setup socket for consumer 64 bit. No need for atomic access | |
2325 | * since it was set above and can ONLY be set in this thread. | |
2326 | */ | |
a4b92340 DG |
2327 | ret = consumer_create_socket(&ustconsumer32_data, |
2328 | cmd_ctx->session->ust_session->consumer); | |
2329 | if (ret < 0) { | |
2330 | goto error; | |
173af62f | 2331 | } |
44d3bd01 DG |
2332 | } |
2333 | break; | |
48842b30 | 2334 | } |
54d01ffb | 2335 | default: |
54d01ffb DG |
2336 | break; |
2337 | } | |
2e09ba09 | 2338 | skip_domain: |
33a2b854 | 2339 | |
5c827ce0 DG |
2340 | /* Validate consumer daemon state when start/stop trace command */ |
2341 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2342 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2343 | switch (cmd_ctx->lsm->domain.type) { | |
2344 | case LTTNG_DOMAIN_UST: | |
2345 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2346 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2347 | goto error; |
2348 | } | |
2349 | break; | |
2350 | case LTTNG_DOMAIN_KERNEL: | |
2351 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2352 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2353 | goto error; |
2354 | } | |
2355 | break; | |
2356 | } | |
2357 | } | |
2358 | ||
8e0af1b4 MD |
2359 | /* |
2360 | * Check that the UID or GID match that of the tracing session. | |
2361 | * The root user can interact with all sessions. | |
2362 | */ | |
2363 | if (need_tracing_session) { | |
2364 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2365 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2366 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2367 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2368 | goto error; |
2369 | } | |
2370 | } | |
2371 | ||
54d01ffb DG |
2372 | /* Process by command type */ |
2373 | switch (cmd_ctx->lsm->cmd_type) { | |
2374 | case LTTNG_ADD_CONTEXT: | |
2375 | { | |
2376 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2377 | cmd_ctx->lsm->u.context.channel_name, | |
2378 | cmd_ctx->lsm->u.context.event_name, | |
2379 | &cmd_ctx->lsm->u.context.ctx); | |
2380 | break; | |
2381 | } | |
2382 | case LTTNG_DISABLE_CHANNEL: | |
2383 | { | |
2384 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2385 | cmd_ctx->lsm->u.disable.channel_name); | |
2386 | break; | |
2387 | } | |
2388 | case LTTNG_DISABLE_EVENT: | |
2389 | { | |
2390 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2391 | cmd_ctx->lsm->u.disable.channel_name, | |
2392 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2393 | break; |
2394 | } | |
54d01ffb DG |
2395 | case LTTNG_DISABLE_ALL_EVENT: |
2396 | { | |
2bdd86d4 | 2397 | DBG("Disabling all events"); |
54d01ffb DG |
2398 | |
2399 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2400 | cmd_ctx->lsm->u.disable.channel_name); | |
2401 | break; | |
2402 | } | |
00e2e675 DG |
2403 | case LTTNG_DISABLE_CONSUMER: |
2404 | { | |
2405 | ret = cmd_disable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session); | |
2406 | break; | |
2407 | } | |
54d01ffb DG |
2408 | case LTTNG_ENABLE_CHANNEL: |
2409 | { | |
aea829b3 | 2410 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 2411 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
2412 | break; |
2413 | } | |
00e2e675 DG |
2414 | case LTTNG_ENABLE_CONSUMER: |
2415 | { | |
a4b92340 DG |
2416 | /* |
2417 | * XXX: 0 means that this URI should be applied on the session. Should | |
2418 | * be a DOMAIN enuam. | |
2419 | */ | |
00e2e675 | 2420 | ret = cmd_enable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session); |
f73fabfd | 2421 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2422 | goto error; |
2423 | } | |
2424 | ||
2425 | if (cmd_ctx->lsm->domain.type == 0) { | |
2426 | /* Add the URI for the UST session if a consumer is present. */ | |
2427 | if (cmd_ctx->session->ust_session && | |
2428 | cmd_ctx->session->ust_session->consumer) { | |
2429 | ret = cmd_enable_consumer(LTTNG_DOMAIN_UST, cmd_ctx->session); | |
2430 | } else if (cmd_ctx->session->kernel_session && | |
2431 | cmd_ctx->session->kernel_session->consumer) { | |
2432 | ret = cmd_enable_consumer(LTTNG_DOMAIN_KERNEL, | |
2433 | cmd_ctx->session); | |
2434 | } | |
2435 | } | |
00e2e675 DG |
2436 | break; |
2437 | } | |
54d01ffb DG |
2438 | case LTTNG_ENABLE_EVENT: |
2439 | { | |
2440 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2441 | cmd_ctx->lsm->u.enable.channel_name, | |
2f77fc4b | 2442 | &cmd_ctx->lsm->u.enable.event, kernel_poll_pipe[1]); |
54d01ffb DG |
2443 | break; |
2444 | } | |
2445 | case LTTNG_ENABLE_ALL_EVENT: | |
2446 | { | |
2bdd86d4 | 2447 | DBG("Enabling all events"); |
54d01ffb DG |
2448 | |
2449 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 | 2450 | cmd_ctx->lsm->u.enable.channel_name, |
2f77fc4b | 2451 | cmd_ctx->lsm->u.enable.event.type, kernel_poll_pipe[1]); |
54d01ffb DG |
2452 | break; |
2453 | } | |
052da939 | 2454 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2455 | { |
9f19cc17 | 2456 | struct lttng_event *events; |
54d01ffb | 2457 | ssize_t nb_events; |
052da939 | 2458 | |
54d01ffb DG |
2459 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2460 | if (nb_events < 0) { | |
f73fabfd | 2461 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2462 | ret = -nb_events; |
2463 | goto error; | |
2ef84c95 DG |
2464 | } |
2465 | ||
2466 | /* | |
2467 | * Setup lttng message with payload size set to the event list size in | |
2468 | * bytes and then copy list into the llm payload. | |
2469 | */ | |
052da939 | 2470 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2471 | if (ret < 0) { |
052da939 | 2472 | free(events); |
2ef84c95 DG |
2473 | goto setup_error; |
2474 | } | |
2475 | ||
2476 | /* Copy event list into message payload */ | |
9f19cc17 | 2477 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2478 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2479 | |
9f19cc17 | 2480 | free(events); |
2ef84c95 | 2481 | |
f73fabfd | 2482 | ret = LTTNG_OK; |
2ef84c95 DG |
2483 | break; |
2484 | } | |
f37d259d MD |
2485 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
2486 | { | |
2487 | struct lttng_event_field *fields; | |
2488 | ssize_t nb_fields; | |
2489 | ||
a4b92340 DG |
2490 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
2491 | &fields); | |
f37d259d | 2492 | if (nb_fields < 0) { |
f73fabfd | 2493 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
2494 | ret = -nb_fields; |
2495 | goto error; | |
2496 | } | |
2497 | ||
2498 | /* | |
2499 | * Setup lttng message with payload size set to the event list size in | |
2500 | * bytes and then copy list into the llm payload. | |
2501 | */ | |
a4b92340 DG |
2502 | ret = setup_lttng_msg(cmd_ctx, |
2503 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
2504 | if (ret < 0) { |
2505 | free(fields); | |
2506 | goto setup_error; | |
2507 | } | |
2508 | ||
2509 | /* Copy event list into message payload */ | |
2510 | memcpy(cmd_ctx->llm->payload, fields, | |
2511 | sizeof(struct lttng_event_field) * nb_fields); | |
2512 | ||
2513 | free(fields); | |
2514 | ||
f73fabfd | 2515 | ret = LTTNG_OK; |
f37d259d MD |
2516 | break; |
2517 | } | |
00e2e675 DG |
2518 | case LTTNG_SET_CONSUMER_URI: |
2519 | { | |
a4b92340 DG |
2520 | size_t nb_uri, len; |
2521 | struct lttng_uri *uris; | |
2522 | ||
2523 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2524 | len = nb_uri * sizeof(struct lttng_uri); | |
2525 | ||
2526 | if (nb_uri == 0) { | |
f73fabfd | 2527 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
2528 | goto error; |
2529 | } | |
2530 | ||
2531 | uris = zmalloc(len); | |
2532 | if (uris == NULL) { | |
f73fabfd | 2533 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2534 | goto error; |
2535 | } | |
2536 | ||
2537 | /* Receive variable len data */ | |
77c7c900 | 2538 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
2539 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2540 | if (ret <= 0) { | |
2541 | DBG("No URIs received from client... continuing"); | |
2542 | *sock_error = 1; | |
f73fabfd | 2543 | ret = LTTNG_ERR_SESSION_FAIL; |
a4b92340 DG |
2544 | goto error; |
2545 | } | |
2546 | ||
00e2e675 | 2547 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 2548 | nb_uri, uris); |
f73fabfd | 2549 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2550 | goto error; |
2551 | } | |
2552 | ||
2553 | /* | |
2554 | * XXX: 0 means that this URI should be applied on the session. Should | |
2555 | * be a DOMAIN enuam. | |
2556 | */ | |
2557 | if (cmd_ctx->lsm->domain.type == 0) { | |
2558 | /* Add the URI for the UST session if a consumer is present. */ | |
2559 | if (cmd_ctx->session->ust_session && | |
2560 | cmd_ctx->session->ust_session->consumer) { | |
2561 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
2562 | nb_uri, uris); | |
2563 | } else if (cmd_ctx->session->kernel_session && | |
2564 | cmd_ctx->session->kernel_session->consumer) { | |
2565 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
2566 | cmd_ctx->session, nb_uri, uris); | |
2567 | } | |
2568 | } | |
2569 | ||
00e2e675 DG |
2570 | break; |
2571 | } | |
f3ed775e | 2572 | case LTTNG_START_TRACE: |
8c0faa1d | 2573 | { |
54d01ffb | 2574 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
2575 | break; |
2576 | } | |
f3ed775e | 2577 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2578 | { |
54d01ffb | 2579 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
2580 | break; |
2581 | } | |
5e16da05 MD |
2582 | case LTTNG_CREATE_SESSION: |
2583 | { | |
a4b92340 DG |
2584 | size_t nb_uri, len; |
2585 | struct lttng_uri *uris = NULL; | |
2586 | ||
2587 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2588 | len = nb_uri * sizeof(struct lttng_uri); | |
2589 | ||
2590 | if (nb_uri > 0) { | |
2591 | uris = zmalloc(len); | |
2592 | if (uris == NULL) { | |
f73fabfd | 2593 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2594 | goto error; |
2595 | } | |
2596 | ||
2597 | /* Receive variable len data */ | |
77c7c900 | 2598 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
2599 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2600 | if (ret <= 0) { | |
2601 | DBG("No URIs received from client... continuing"); | |
2602 | *sock_error = 1; | |
f73fabfd | 2603 | ret = LTTNG_ERR_SESSION_FAIL; |
a4b92340 DG |
2604 | goto error; |
2605 | } | |
2606 | ||
2607 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
2608 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 2609 | ret = LTTNG_ERR_SESSION_FAIL; |
a4b92340 DG |
2610 | goto error; |
2611 | } | |
2612 | } | |
2613 | ||
2614 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
2615 | &cmd_ctx->creds); | |
2616 | ||
00e2e675 DG |
2617 | break; |
2618 | } | |
5e16da05 MD |
2619 | case LTTNG_DESTROY_SESSION: |
2620 | { | |
2f77fc4b | 2621 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
2622 | |
2623 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 2624 | cmd_ctx->session = NULL; |
5461b305 | 2625 | break; |
5e16da05 | 2626 | } |
9f19cc17 | 2627 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2628 | { |
54d01ffb DG |
2629 | ssize_t nb_dom; |
2630 | struct lttng_domain *domains; | |
5461b305 | 2631 | |
54d01ffb DG |
2632 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
2633 | if (nb_dom < 0) { | |
f73fabfd | 2634 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2635 | ret = -nb_dom; |
2636 | goto error; | |
ce3d728c | 2637 | } |
520ff687 | 2638 | |
54d01ffb | 2639 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
2640 | if (ret < 0) { |
2641 | goto setup_error; | |
520ff687 | 2642 | } |
57167058 | 2643 | |
54d01ffb DG |
2644 | /* Copy event list into message payload */ |
2645 | memcpy(cmd_ctx->llm->payload, domains, | |
2646 | nb_dom * sizeof(struct lttng_domain)); | |
2647 | ||
2648 | free(domains); | |
5e16da05 | 2649 | |
f73fabfd | 2650 | ret = LTTNG_OK; |
5e16da05 MD |
2651 | break; |
2652 | } | |
9f19cc17 | 2653 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2654 | { |
6775595e | 2655 | int nb_chan; |
54d01ffb DG |
2656 | struct lttng_channel *channels; |
2657 | ||
b551a063 DG |
2658 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
2659 | cmd_ctx->session, &channels); | |
54d01ffb | 2660 | if (nb_chan < 0) { |
f73fabfd | 2661 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2662 | ret = -nb_chan; |
2663 | goto error; | |
5461b305 | 2664 | } |
ca95a216 | 2665 | |
54d01ffb | 2666 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
2667 | if (ret < 0) { |
2668 | goto setup_error; | |
2669 | } | |
9f19cc17 | 2670 | |
54d01ffb DG |
2671 | /* Copy event list into message payload */ |
2672 | memcpy(cmd_ctx->llm->payload, channels, | |
2673 | nb_chan * sizeof(struct lttng_channel)); | |
2674 | ||
2675 | free(channels); | |
9f19cc17 | 2676 | |
f73fabfd | 2677 | ret = LTTNG_OK; |
5461b305 | 2678 | break; |
5e16da05 | 2679 | } |
9f19cc17 | 2680 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2681 | { |
b551a063 | 2682 | ssize_t nb_event; |
684d34d2 | 2683 | struct lttng_event *events = NULL; |
9f19cc17 | 2684 | |
b551a063 | 2685 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
2686 | cmd_ctx->lsm->u.list.channel_name, &events); |
2687 | if (nb_event < 0) { | |
f73fabfd | 2688 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2689 | ret = -nb_event; |
2690 | goto error; | |
5461b305 | 2691 | } |
ca95a216 | 2692 | |
54d01ffb | 2693 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
2694 | if (ret < 0) { |
2695 | goto setup_error; | |
2696 | } | |
9f19cc17 | 2697 | |
54d01ffb DG |
2698 | /* Copy event list into message payload */ |
2699 | memcpy(cmd_ctx->llm->payload, events, | |
2700 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 2701 | |
54d01ffb | 2702 | free(events); |
9f19cc17 | 2703 | |
f73fabfd | 2704 | ret = LTTNG_OK; |
5461b305 | 2705 | break; |
5e16da05 MD |
2706 | } |
2707 | case LTTNG_LIST_SESSIONS: | |
2708 | { | |
8e0af1b4 | 2709 | unsigned int nr_sessions; |
5461b305 | 2710 | |
8e0af1b4 | 2711 | session_lock_list(); |
730389d9 DG |
2712 | nr_sessions = lttng_sessions_count( |
2713 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
2714 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 2715 | |
8e0af1b4 | 2716 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 2717 | if (ret < 0) { |
54d01ffb | 2718 | session_unlock_list(); |
5461b305 | 2719 | goto setup_error; |
e065084a | 2720 | } |
5e16da05 | 2721 | |
6c9cc2ab | 2722 | /* Filled the session array */ |
2f77fc4b | 2723 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
2724 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2725 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 2726 | |
54d01ffb | 2727 | session_unlock_list(); |
5e16da05 | 2728 | |
f73fabfd | 2729 | ret = LTTNG_OK; |
5e16da05 MD |
2730 | break; |
2731 | } | |
d0254c7c MD |
2732 | case LTTNG_CALIBRATE: |
2733 | { | |
54d01ffb DG |
2734 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
2735 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
2736 | break; |
2737 | } | |
d9800920 DG |
2738 | case LTTNG_REGISTER_CONSUMER: |
2739 | { | |
2f77fc4b DG |
2740 | struct consumer_data *cdata; |
2741 | ||
2742 | switch (cmd_ctx->lsm->domain.type) { | |
2743 | case LTTNG_DOMAIN_KERNEL: | |
2744 | cdata = &kconsumer_data; | |
2745 | break; | |
2746 | default: | |
f73fabfd | 2747 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2748 | goto error; |
2749 | } | |
2750 | ||
54d01ffb | 2751 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 2752 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
2753 | break; |
2754 | } | |
53a80697 MD |
2755 | case LTTNG_SET_FILTER: |
2756 | { | |
2757 | struct lttng_filter_bytecode *bytecode; | |
2758 | ||
d93c4f1f | 2759 | if (cmd_ctx->lsm->u.filter.bytecode_len > LTTNG_FILTER_MAX_LEN) { |
f73fabfd | 2760 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2761 | goto error; |
2762 | } | |
2763 | bytecode = zmalloc(cmd_ctx->lsm->u.filter.bytecode_len); | |
2764 | if (!bytecode) { | |
f73fabfd | 2765 | ret = LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
2766 | goto error; |
2767 | } | |
2768 | /* Receive var. len. data */ | |
2769 | DBG("Receiving var len data from client ..."); | |
2770 | ret = lttcomm_recv_unix_sock(sock, bytecode, | |
2771 | cmd_ctx->lsm->u.filter.bytecode_len); | |
2772 | if (ret <= 0) { | |
2773 | DBG("Nothing recv() from client var len data... continuing"); | |
2774 | *sock_error = 1; | |
f73fabfd | 2775 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2776 | goto error; |
2777 | } | |
2778 | ||
2779 | if (bytecode->len + sizeof(*bytecode) | |
2780 | != cmd_ctx->lsm->u.filter.bytecode_len) { | |
2781 | free(bytecode); | |
f73fabfd | 2782 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2783 | goto error; |
2784 | } | |
2785 | ||
2786 | ret = cmd_set_filter(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2787 | cmd_ctx->lsm->u.filter.channel_name, | |
2788 | cmd_ctx->lsm->u.filter.event_name, | |
2789 | bytecode); | |
2790 | break; | |
2791 | } | |
806e2684 DG |
2792 | case LTTNG_DATA_AVAILABLE: |
2793 | { | |
2794 | ret = cmd_data_available(cmd_ctx->session); | |
2795 | break; | |
2796 | } | |
5e16da05 | 2797 | default: |
f73fabfd | 2798 | ret = LTTNG_ERR_UND; |
5461b305 | 2799 | break; |
fac6795d DG |
2800 | } |
2801 | ||
5461b305 | 2802 | error: |
5461b305 DG |
2803 | if (cmd_ctx->llm == NULL) { |
2804 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2805 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2806 | goto setup_error; |
2807 | } | |
2808 | } | |
54d01ffb | 2809 | /* Set return code */ |
5461b305 | 2810 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 2811 | setup_error: |
b5541356 | 2812 | if (cmd_ctx->session) { |
54d01ffb | 2813 | session_unlock(cmd_ctx->session); |
b5541356 | 2814 | } |
256a5576 MD |
2815 | if (need_tracing_session) { |
2816 | session_unlock_list(); | |
2817 | } | |
54d01ffb | 2818 | init_setup_error: |
8028d920 | 2819 | return ret; |
fac6795d DG |
2820 | } |
2821 | ||
44a5e5eb DG |
2822 | /* |
2823 | * Thread managing health check socket. | |
2824 | */ | |
2825 | static void *thread_manage_health(void *data) | |
2826 | { | |
eb4a2943 | 2827 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
2828 | uint32_t revents, nb_fd; |
2829 | struct lttng_poll_event events; | |
2830 | struct lttcomm_health_msg msg; | |
2831 | struct lttcomm_health_data reply; | |
2832 | ||
2833 | DBG("[thread] Manage health check started"); | |
2834 | ||
2835 | rcu_register_thread(); | |
2836 | ||
2837 | /* Create unix socket */ | |
2838 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
2839 | if (sock < 0) { | |
2840 | ERR("Unable to create health check Unix socket"); | |
2841 | ret = -1; | |
2842 | goto error; | |
2843 | } | |
2844 | ||
2845 | ret = lttcomm_listen_unix_sock(sock); | |
2846 | if (ret < 0) { | |
2847 | goto error; | |
2848 | } | |
2849 | ||
2850 | /* | |
2851 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2852 | * more will be added to this poll set. | |
2853 | */ | |
2854 | ret = create_thread_poll_set(&events, 2); | |
2855 | if (ret < 0) { | |
2856 | goto error; | |
2857 | } | |
2858 | ||
2859 | /* Add the application registration socket */ | |
2860 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
2861 | if (ret < 0) { | |
2862 | goto error; | |
2863 | } | |
2864 | ||
2865 | while (1) { | |
2866 | DBG("Health check ready"); | |
2867 | ||
2868 | nb_fd = LTTNG_POLL_GETNB(&events); | |
2869 | ||
2870 | /* Inifinite blocking call, waiting for transmission */ | |
2871 | restart: | |
2872 | ret = lttng_poll_wait(&events, -1); | |
2873 | if (ret < 0) { | |
2874 | /* | |
2875 | * Restart interrupted system call. | |
2876 | */ | |
2877 | if (errno == EINTR) { | |
2878 | goto restart; | |
2879 | } | |
2880 | goto error; | |
2881 | } | |
2882 | ||
2883 | for (i = 0; i < nb_fd; i++) { | |
2884 | /* Fetch once the poll data */ | |
2885 | revents = LTTNG_POLL_GETEV(&events, i); | |
2886 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2887 | ||
2888 | /* Thread quit pipe has been closed. Killing thread. */ | |
2889 | ret = check_thread_quit_pipe(pollfd, revents); | |
2890 | if (ret) { | |
139ac872 MD |
2891 | err = 0; |
2892 | goto exit; | |
44a5e5eb DG |
2893 | } |
2894 | ||
2895 | /* Event on the registration socket */ | |
2896 | if (pollfd == sock) { | |
2897 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2898 | ERR("Health socket poll error"); | |
2899 | goto error; | |
2900 | } | |
2901 | } | |
2902 | } | |
2903 | ||
2904 | new_sock = lttcomm_accept_unix_sock(sock); | |
2905 | if (new_sock < 0) { | |
2906 | goto error; | |
2907 | } | |
2908 | ||
2909 | DBG("Receiving data from client for health..."); | |
2910 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
2911 | if (ret <= 0) { | |
2912 | DBG("Nothing recv() from client... continuing"); | |
2913 | ret = close(new_sock); | |
2914 | if (ret) { | |
2915 | PERROR("close"); | |
2916 | } | |
2917 | new_sock = -1; | |
2918 | continue; | |
2919 | } | |
2920 | ||
2921 | rcu_thread_online(); | |
2922 | ||
2923 | switch (msg.component) { | |
2924 | case LTTNG_HEALTH_CMD: | |
2925 | reply.ret_code = health_check_state(&health_thread_cmd); | |
2926 | break; | |
139ac872 MD |
2927 | case LTTNG_HEALTH_APP_MANAGE: |
2928 | reply.ret_code = health_check_state(&health_thread_app_manage); | |
2929 | break; | |
44a5e5eb DG |
2930 | case LTTNG_HEALTH_APP_REG: |
2931 | reply.ret_code = health_check_state(&health_thread_app_reg); | |
2932 | break; | |
2933 | case LTTNG_HEALTH_KERNEL: | |
2934 | reply.ret_code = health_check_state(&health_thread_kernel); | |
2935 | break; | |
2936 | case LTTNG_HEALTH_CONSUMER: | |
2937 | reply.ret_code = check_consumer_health(); | |
2938 | break; | |
2939 | case LTTNG_HEALTH_ALL: | |
44a5e5eb | 2940 | reply.ret_code = |
139ac872 MD |
2941 | health_check_state(&health_thread_app_manage) && |
2942 | health_check_state(&health_thread_app_reg) && | |
2943 | health_check_state(&health_thread_cmd) && | |
2944 | health_check_state(&health_thread_kernel) && | |
2945 | check_consumer_health(); | |
44a5e5eb DG |
2946 | break; |
2947 | default: | |
f73fabfd | 2948 | reply.ret_code = LTTNG_ERR_UND; |
44a5e5eb DG |
2949 | break; |
2950 | } | |
2951 | ||
2952 | /* | |
2953 | * Flip ret value since 0 is a success and 1 indicates a bad health for | |
2954 | * the client where in the sessiond it is the opposite. Again, this is | |
2955 | * just to make things easier for us poor developer which enjoy a lot | |
2956 | * lazyness. | |
2957 | */ | |
2958 | if (reply.ret_code == 0 || reply.ret_code == 1) { | |
2959 | reply.ret_code = !reply.ret_code; | |
2960 | } | |
2961 | ||
2962 | DBG2("Health check return value %d", reply.ret_code); | |
2963 | ||
2964 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
2965 | if (ret < 0) { | |
2966 | ERR("Failed to send health data back to client"); | |
2967 | } | |
2968 | ||
2969 | /* End of transmission */ | |
2970 | ret = close(new_sock); | |
2971 | if (ret) { | |
2972 | PERROR("close"); | |
2973 | } | |
2974 | new_sock = -1; | |
2975 | } | |
2976 | ||
139ac872 | 2977 | exit: |
44a5e5eb | 2978 | error: |
139ac872 MD |
2979 | if (err) { |
2980 | ERR("Health error occurred in %s", __func__); | |
2981 | } | |
44a5e5eb DG |
2982 | DBG("Health check thread dying"); |
2983 | unlink(health_unix_sock_path); | |
2984 | if (sock >= 0) { | |
2985 | ret = close(sock); | |
2986 | if (ret) { | |
2987 | PERROR("close"); | |
2988 | } | |
2989 | } | |
2990 | if (new_sock >= 0) { | |
2991 | ret = close(new_sock); | |
2992 | if (ret) { | |
2993 | PERROR("close"); | |
2994 | } | |
2995 | } | |
2996 | ||
2997 | lttng_poll_clean(&events); | |
2998 | ||
2999 | rcu_unregister_thread(); | |
3000 | return NULL; | |
3001 | } | |
3002 | ||
1d4b027a | 3003 | /* |
d063d709 DG |
3004 | * This thread manage all clients request using the unix client socket for |
3005 | * communication. | |
1d4b027a DG |
3006 | */ |
3007 | static void *thread_manage_clients(void *data) | |
3008 | { | |
139ac872 | 3009 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3010 | int sock_error; |
5eb91c98 | 3011 | uint32_t revents, nb_fd; |
273ea72c | 3012 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3013 | struct lttng_poll_event events; |
1d4b027a DG |
3014 | |
3015 | DBG("[thread] Manage client started"); | |
3016 | ||
8ac94142 CB |
3017 | testpoint(thread_manage_clients); |
3018 | ||
f6a9efaa DG |
3019 | rcu_register_thread(); |
3020 | ||
44a5e5eb DG |
3021 | health_code_update(&health_thread_cmd); |
3022 | ||
1d4b027a DG |
3023 | ret = lttcomm_listen_unix_sock(client_sock); |
3024 | if (ret < 0) { | |
3025 | goto error; | |
3026 | } | |
3027 | ||
5eb91c98 DG |
3028 | /* |
3029 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3030 | * more will be added to this poll set. | |
3031 | */ | |
3032 | ret = create_thread_poll_set(&events, 2); | |
3033 | if (ret < 0) { | |
3034 | goto error; | |
3035 | } | |
273ea72c | 3036 | |
5eb91c98 DG |
3037 | /* Add the application registration socket */ |
3038 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3039 | if (ret < 0) { | |
3040 | goto error; | |
3041 | } | |
273ea72c | 3042 | |
bbd973c2 DG |
3043 | /* |
3044 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3045 | */ |
3046 | if (opt_sig_parent) { | |
8db8d1dc | 3047 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3048 | } |
3049 | ||
8ac94142 CB |
3050 | testpoint(thread_manage_clients_before_loop); |
3051 | ||
44a5e5eb DG |
3052 | health_code_update(&health_thread_cmd); |
3053 | ||
1d4b027a | 3054 | while (1) { |
1d4b027a | 3055 | DBG("Accepting client command ..."); |
273ea72c | 3056 | |
5eb91c98 DG |
3057 | nb_fd = LTTNG_POLL_GETNB(&events); |
3058 | ||
273ea72c | 3059 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 3060 | restart: |
44a5e5eb | 3061 | health_poll_update(&health_thread_cmd); |
5eb91c98 | 3062 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 3063 | health_poll_update(&health_thread_cmd); |
273ea72c | 3064 | if (ret < 0) { |
88f2b785 MD |
3065 | /* |
3066 | * Restart interrupted system call. | |
3067 | */ | |
3068 | if (errno == EINTR) { | |
3069 | goto restart; | |
3070 | } | |
273ea72c DG |
3071 | goto error; |
3072 | } | |
3073 | ||
5eb91c98 DG |
3074 | for (i = 0; i < nb_fd; i++) { |
3075 | /* Fetch once the poll data */ | |
3076 | revents = LTTNG_POLL_GETEV(&events, i); | |
3077 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3078 | ||
44a5e5eb DG |
3079 | health_code_update(&health_thread_cmd); |
3080 | ||
5eb91c98 DG |
3081 | /* Thread quit pipe has been closed. Killing thread. */ |
3082 | ret = check_thread_quit_pipe(pollfd, revents); | |
3083 | if (ret) { | |
139ac872 MD |
3084 | err = 0; |
3085 | goto exit; | |
5eb91c98 DG |
3086 | } |
3087 | ||
3088 | /* Event on the registration socket */ | |
3089 | if (pollfd == client_sock) { | |
3090 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3091 | ERR("Client socket poll error"); | |
3092 | goto error; | |
3093 | } | |
3094 | } | |
3095 | } | |
3096 | ||
3097 | DBG("Wait for client response"); | |
3098 | ||
44a5e5eb DG |
3099 | health_code_update(&health_thread_cmd); |
3100 | ||
5eb91c98 DG |
3101 | sock = lttcomm_accept_unix_sock(client_sock); |
3102 | if (sock < 0) { | |
273ea72c | 3103 | goto error; |
273ea72c DG |
3104 | } |
3105 | ||
be040666 DG |
3106 | /* Set socket option for credentials retrieval */ |
3107 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3108 | if (ret < 0) { | |
3109 | goto error; | |
3110 | } | |
3111 | ||
5eb91c98 | 3112 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3113 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3114 | if (cmd_ctx == NULL) { |
76d7553f | 3115 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3116 | goto error; |
5eb91c98 | 3117 | } |
1d4b027a | 3118 | |
5eb91c98 | 3119 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3120 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3121 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3122 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3123 | goto error; |
3124 | } | |
1d4b027a | 3125 | |
5eb91c98 DG |
3126 | cmd_ctx->llm = NULL; |
3127 | cmd_ctx->session = NULL; | |
1d4b027a | 3128 | |
44a5e5eb DG |
3129 | health_code_update(&health_thread_cmd); |
3130 | ||
5eb91c98 DG |
3131 | /* |
3132 | * Data is received from the lttng client. The struct | |
3133 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3134 | * the client. | |
3135 | */ | |
3136 | DBG("Receiving data from client ..."); | |
be040666 DG |
3137 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3138 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3139 | if (ret <= 0) { |
3140 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3141 | ret = close(sock); |
3142 | if (ret) { | |
3143 | PERROR("close"); | |
3144 | } | |
3145 | sock = -1; | |
a2c0da86 | 3146 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3147 | continue; |
3148 | } | |
1d4b027a | 3149 | |
44a5e5eb DG |
3150 | health_code_update(&health_thread_cmd); |
3151 | ||
5eb91c98 DG |
3152 | // TODO: Validate cmd_ctx including sanity check for |
3153 | // security purpose. | |
f7776ea7 | 3154 | |
f6a9efaa | 3155 | rcu_thread_online(); |
5eb91c98 DG |
3156 | /* |
3157 | * This function dispatch the work to the kernel or userspace tracer | |
3158 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3159 | * informations for the client. The command context struct contains | |
3160 | * everything this function may needs. | |
3161 | */ | |
53a80697 | 3162 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3163 | rcu_thread_offline(); |
5eb91c98 | 3164 | if (ret < 0) { |
53a80697 MD |
3165 | if (sock_error) { |
3166 | ret = close(sock); | |
3167 | if (ret) { | |
3168 | PERROR("close"); | |
3169 | } | |
3170 | sock = -1; | |
3171 | } | |
bbd973c2 | 3172 | /* |
5eb91c98 | 3173 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3174 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3175 | * (ENOMEM). Error detected but still accept |
3176 | * command, unless a socket error has been | |
3177 | * detected. | |
bbd973c2 | 3178 | */ |
bbd973c2 | 3179 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3180 | continue; |
3181 | } | |
d6e4fca4 | 3182 | |
44a5e5eb DG |
3183 | health_code_update(&health_thread_cmd); |
3184 | ||
54d01ffb DG |
3185 | DBG("Sending response (size: %d, retcode: %s)", |
3186 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3187 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3188 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3189 | if (ret < 0) { |
3190 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3191 | } |
1d4b027a | 3192 | |
5eb91c98 | 3193 | /* End of transmission */ |
76d7553f MD |
3194 | ret = close(sock); |
3195 | if (ret) { | |
3196 | PERROR("close"); | |
3197 | } | |
3198 | sock = -1; | |
be040666 DG |
3199 | |
3200 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb DG |
3201 | |
3202 | health_code_update(&health_thread_cmd); | |
273ea72c DG |
3203 | } |
3204 | ||
139ac872 | 3205 | exit: |
5eb91c98 | 3206 | error: |
139ac872 MD |
3207 | if (err) { |
3208 | health_error(&health_thread_cmd); | |
3209 | ERR("Health error occurred in %s", __func__); | |
3210 | } | |
3211 | health_exit(&health_thread_cmd); | |
44a5e5eb | 3212 | |
5eb91c98 | 3213 | DBG("Client thread dying"); |
273ea72c | 3214 | unlink(client_unix_sock_path); |
76d7553f MD |
3215 | if (client_sock >= 0) { |
3216 | ret = close(client_sock); | |
3217 | if (ret) { | |
3218 | PERROR("close"); | |
3219 | } | |
a4b35e07 MD |
3220 | } |
3221 | if (sock >= 0) { | |
76d7553f MD |
3222 | ret = close(sock); |
3223 | if (ret) { | |
3224 | PERROR("close"); | |
3225 | } | |
a4b35e07 | 3226 | } |
273ea72c | 3227 | |
5eb91c98 | 3228 | lttng_poll_clean(&events); |
a2fb29a5 | 3229 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3230 | |
3231 | rcu_unregister_thread(); | |
1d4b027a DG |
3232 | return NULL; |
3233 | } | |
3234 | ||
3235 | ||
fac6795d DG |
3236 | /* |
3237 | * usage function on stderr | |
3238 | */ | |
3239 | static void usage(void) | |
3240 | { | |
b716ce68 | 3241 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3242 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3243 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3244 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3245 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3246 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3247 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3248 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3249 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3250 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3251 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3252 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3253 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3254 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3255 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3256 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3257 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3258 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3259 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3260 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3261 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3262 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3263 | } |
3264 | ||
3265 | /* | |
3266 | * daemon argument parsing | |
3267 | */ | |
3268 | static int parse_args(int argc, char **argv) | |
3269 | { | |
3270 | int c; | |
3271 | ||
3272 | static struct option long_options[] = { | |
3273 | { "client-sock", 1, 0, 'c' }, | |
3274 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3275 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3276 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3277 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3278 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3279 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3280 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3281 | { "consumerd32-path", 1, 0, 'u' }, | |
3282 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3283 | { "consumerd64-path", 1, 0, 't' }, | |
3284 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3285 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3286 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3287 | { "help", 0, 0, 'h' }, |
3288 | { "group", 1, 0, 'g' }, | |
3289 | { "version", 0, 0, 'V' }, | |
75462a81 | 3290 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3291 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3292 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3293 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
3294 | { NULL, 0, 0, 0 } |
3295 | }; | |
3296 | ||
3297 | while (1) { | |
3298 | int option_index = 0; | |
4fba7219 | 3299 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3300 | long_options, &option_index); |
fac6795d DG |
3301 | if (c == -1) { |
3302 | break; | |
3303 | } | |
3304 | ||
3305 | switch (c) { | |
3306 | case 0: | |
3307 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3308 | if (optarg) { | |
3309 | fprintf(stderr, " with arg %s\n", optarg); | |
3310 | } | |
3311 | break; | |
b716ce68 | 3312 | case 'c': |
fac6795d DG |
3313 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3314 | break; | |
3315 | case 'a': | |
3316 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3317 | break; | |
3318 | case 'd': | |
3319 | opt_daemon = 1; | |
3320 | break; | |
3321 | case 'g': | |
fb09408a | 3322 | opt_tracing_group = optarg; |
fac6795d DG |
3323 | break; |
3324 | case 'h': | |
3325 | usage(); | |
3326 | exit(EXIT_FAILURE); | |
3327 | case 'V': | |
3328 | fprintf(stdout, "%s\n", VERSION); | |
3329 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3330 | case 'S': |
3331 | opt_sig_parent = 1; | |
3332 | break; | |
d6f42150 | 3333 | case 'E': |
3bd1e081 | 3334 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3335 | break; |
3336 | case 'C': | |
3bd1e081 MD |
3337 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3338 | break; | |
3339 | case 'F': | |
7753dea8 | 3340 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3341 | break; |
3342 | case 'D': | |
7753dea8 MD |
3343 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3344 | break; | |
3345 | case 'H': | |
3346 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3347 | break; | |
3348 | case 'G': | |
3349 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3350 | break; |
4fba7219 DG |
3351 | case 'N': |
3352 | opt_no_kernel = 1; | |
3353 | break; | |
75462a81 | 3354 | case 'q': |
97e19046 | 3355 | lttng_opt_quiet = 1; |
75462a81 | 3356 | break; |
3f9947db | 3357 | case 'v': |
53086306 | 3358 | /* Verbose level can increase using multiple -v */ |
97e19046 | 3359 | lttng_opt_verbose += 1; |
3f9947db | 3360 | break; |
31f73cc9 | 3361 | case 'Z': |
3bd1e081 | 3362 | opt_verbose_consumer += 1; |
31f73cc9 | 3363 | break; |
fb09408a | 3364 | case 'u': |
fc7a59ce | 3365 | consumerd32_bin= optarg; |
ebaeda94 MD |
3366 | break; |
3367 | case 'U': | |
3368 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3369 | break; |
3370 | case 't': | |
fc7a59ce | 3371 | consumerd64_bin = optarg; |
ebaeda94 MD |
3372 | break; |
3373 | case 'T': | |
3374 | consumerd64_libdir = optarg; | |
fb09408a | 3375 | break; |
fac6795d DG |
3376 | default: |
3377 | /* Unknown option or other error. | |
3378 | * Error is printed by getopt, just return */ | |
3379 | return -1; | |
3380 | } | |
3381 | } | |
3382 | ||
3383 | return 0; | |
3384 | } | |
3385 | ||
3386 | /* | |
d063d709 | 3387 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3388 | * apps_sock - The communication socket for all UST apps. |
3389 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3390 | */ |
cf3af59e | 3391 | static int init_daemon_socket(void) |
fac6795d DG |
3392 | { |
3393 | int ret = 0; | |
3394 | mode_t old_umask; | |
3395 | ||
3396 | old_umask = umask(0); | |
3397 | ||
3398 | /* Create client tool unix socket */ | |
d6f42150 DG |
3399 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3400 | if (client_sock < 0) { | |
3401 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3402 | ret = -1; |
3403 | goto end; | |
3404 | } | |
3405 | ||
3406 | /* File permission MUST be 660 */ | |
3407 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3408 | if (ret < 0) { | |
d6f42150 | 3409 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 3410 | PERROR("chmod"); |
fac6795d DG |
3411 | goto end; |
3412 | } | |
3413 | ||
3414 | /* Create the application unix socket */ | |
d6f42150 DG |
3415 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3416 | if (apps_sock < 0) { | |
3417 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3418 | ret = -1; |
3419 | goto end; | |
3420 | } | |
3421 | ||
d6f42150 | 3422 | /* File permission MUST be 666 */ |
54d01ffb DG |
3423 | ret = chmod(apps_unix_sock_path, |
3424 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3425 | if (ret < 0) { |
d6f42150 | 3426 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 3427 | PERROR("chmod"); |
fac6795d DG |
3428 | goto end; |
3429 | } | |
3430 | ||
3431 | end: | |
3432 | umask(old_umask); | |
3433 | return ret; | |
3434 | } | |
3435 | ||
3436 | /* | |
54d01ffb DG |
3437 | * Check if the global socket is available, and if a daemon is answering at the |
3438 | * other side. If yes, error is returned. | |
fac6795d | 3439 | */ |
cf3af59e | 3440 | static int check_existing_daemon(void) |
fac6795d | 3441 | { |
7d8234d9 | 3442 | /* Is there anybody out there ? */ |
099e26bd | 3443 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3444 | return -EEXIST; |
099e26bd | 3445 | } |
b09c7c76 DG |
3446 | |
3447 | return 0; | |
fac6795d DG |
3448 | } |
3449 | ||
fac6795d | 3450 | /* |
d063d709 | 3451 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3452 | * |
d063d709 | 3453 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 3454 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 3455 | */ |
be040666 | 3456 | static int set_permissions(char *rundir) |
fac6795d DG |
3457 | { |
3458 | int ret; | |
996b65c8 | 3459 | gid_t gid; |
fac6795d | 3460 | |
6775595e DG |
3461 | ret = allowed_group(); |
3462 | if (ret < 0) { | |
be040666 DG |
3463 | WARN("No tracing group detected"); |
3464 | ret = 0; | |
fac6795d DG |
3465 | goto end; |
3466 | } | |
3467 | ||
6775595e DG |
3468 | gid = ret; |
3469 | ||
d6f42150 | 3470 | /* Set lttng run dir */ |
be040666 | 3471 | ret = chown(rundir, 0, gid); |
d6f42150 | 3472 | if (ret < 0) { |
be040666 | 3473 | ERR("Unable to set group on %s", rundir); |
76d7553f | 3474 | PERROR("chown"); |
d6f42150 DG |
3475 | } |
3476 | ||
d1613cf5 | 3477 | /* Ensure tracing group can search the run dir */ |
61076f74 | 3478 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
3479 | if (ret < 0) { |
3480 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 3481 | PERROR("chmod"); |
d1613cf5 JN |
3482 | } |
3483 | ||
d6f42150 | 3484 | /* lttng client socket path */ |
996b65c8 | 3485 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3486 | if (ret < 0) { |
d6f42150 | 3487 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 3488 | PERROR("chown"); |
d6f42150 DG |
3489 | } |
3490 | ||
3bd1e081 MD |
3491 | /* kconsumer error socket path */ |
3492 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 3493 | if (ret < 0) { |
3bd1e081 | 3494 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 3495 | PERROR("chown"); |
3bd1e081 MD |
3496 | } |
3497 | ||
7753dea8 MD |
3498 | /* 64-bit ustconsumer error socket path */ |
3499 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
3500 | if (ret < 0) { | |
3501 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 3502 | PERROR("chown"); |
7753dea8 MD |
3503 | } |
3504 | ||
3505 | /* 32-bit ustconsumer compat32 error socket path */ | |
3506 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 3507 | if (ret < 0) { |
7753dea8 | 3508 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 3509 | PERROR("chown"); |
fac6795d DG |
3510 | } |
3511 | ||
d6f42150 | 3512 | DBG("All permissions are set"); |
e07ae692 | 3513 | |
fac6795d DG |
3514 | end: |
3515 | return ret; | |
3516 | } | |
3517 | ||
d6f42150 | 3518 | /* |
d063d709 | 3519 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 3520 | */ |
67e40797 | 3521 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
3522 | { |
3523 | int ret; | |
3524 | ||
67e40797 DG |
3525 | DBG3("Creating LTTng run directory: %s", rundir); |
3526 | ||
d1613cf5 | 3527 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 3528 | if (ret < 0) { |
b1f11e69 | 3529 | if (errno != EEXIST) { |
67e40797 | 3530 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
3531 | goto error; |
3532 | } else { | |
3533 | ret = 0; | |
3534 | } | |
d6f42150 DG |
3535 | } |
3536 | ||
3537 | error: | |
3538 | return ret; | |
3539 | } | |
3540 | ||
3541 | /* | |
d063d709 DG |
3542 | * Setup sockets and directory needed by the kconsumerd communication with the |
3543 | * session daemon. | |
d6f42150 | 3544 | */ |
67e40797 DG |
3545 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
3546 | const char *rundir) | |
d6f42150 DG |
3547 | { |
3548 | int ret; | |
67e40797 | 3549 | char path[PATH_MAX]; |
d6f42150 | 3550 | |
67e40797 | 3551 | switch (consumer_data->type) { |
7753dea8 | 3552 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 3553 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
3554 | break; |
3555 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 3556 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
3557 | break; |
3558 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 3559 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
3560 | break; |
3561 | default: | |
3562 | ERR("Consumer type unknown"); | |
3563 | ret = -EINVAL; | |
3564 | goto error; | |
d6f42150 DG |
3565 | } |
3566 | ||
67e40797 DG |
3567 | DBG2("Creating consumer directory: %s", path); |
3568 | ||
d1613cf5 | 3569 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 3570 | if (ret < 0) { |
6beb2242 | 3571 | if (errno != EEXIST) { |
f11e84c2 | 3572 | PERROR("mkdir"); |
3bd1e081 | 3573 | ERR("Failed to create %s", path); |
6beb2242 DG |
3574 | goto error; |
3575 | } | |
f11e84c2 | 3576 | ret = -1; |
d6f42150 DG |
3577 | } |
3578 | ||
3579 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
3580 | consumer_data->err_sock = |
3581 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
3582 | if (consumer_data->err_sock < 0) { | |
3583 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
3584 | ret = -1; |
3585 | goto error; | |
3586 | } | |
3587 | ||
3588 | /* File permission MUST be 660 */ | |
3bd1e081 | 3589 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 3590 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 3591 | if (ret < 0) { |
3bd1e081 | 3592 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 3593 | PERROR("chmod"); |
d6f42150 DG |
3594 | goto error; |
3595 | } | |
3596 | ||
3597 | error: | |
3598 | return ret; | |
3599 | } | |
3600 | ||
fac6795d | 3601 | /* |
d063d709 | 3602 | * Signal handler for the daemon |
cf3af59e | 3603 | * |
54d01ffb DG |
3604 | * Simply stop all worker threads, leaving main() return gracefully after |
3605 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3606 | */ |
3607 | static void sighandler(int sig) | |
3608 | { | |
3609 | switch (sig) { | |
cf3af59e | 3610 | case SIGPIPE: |
af87c45a | 3611 | DBG("SIGPIPE caught"); |
cf3af59e MD |
3612 | return; |
3613 | case SIGINT: | |
af87c45a | 3614 | DBG("SIGINT caught"); |
cf3af59e MD |
3615 | stop_threads(); |
3616 | break; | |
3617 | case SIGTERM: | |
af87c45a | 3618 | DBG("SIGTERM caught"); |
cf3af59e MD |
3619 | stop_threads(); |
3620 | break; | |
3621 | default: | |
3622 | break; | |
fac6795d | 3623 | } |
fac6795d DG |
3624 | } |
3625 | ||
3626 | /* | |
d063d709 | 3627 | * Setup signal handler for : |
1d4b027a | 3628 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3629 | */ |
1d4b027a | 3630 | static int set_signal_handler(void) |
fac6795d | 3631 | { |
1d4b027a DG |
3632 | int ret = 0; |
3633 | struct sigaction sa; | |
3634 | sigset_t sigset; | |
fac6795d | 3635 | |
1d4b027a | 3636 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 3637 | PERROR("sigemptyset"); |
1d4b027a DG |
3638 | return ret; |
3639 | } | |
d6f42150 | 3640 | |
1d4b027a DG |
3641 | sa.sa_handler = sighandler; |
3642 | sa.sa_mask = sigset; | |
3643 | sa.sa_flags = 0; | |
3644 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 3645 | PERROR("sigaction"); |
1d4b027a | 3646 | return ret; |
d6f42150 DG |
3647 | } |
3648 | ||
1d4b027a | 3649 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 3650 | PERROR("sigaction"); |
1d4b027a | 3651 | return ret; |
d6f42150 | 3652 | } |
aaf26714 | 3653 | |
1d4b027a | 3654 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 3655 | PERROR("sigaction"); |
1d4b027a | 3656 | return ret; |
8c0faa1d DG |
3657 | } |
3658 | ||
1d4b027a DG |
3659 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3660 | ||
3661 | return ret; | |
fac6795d DG |
3662 | } |
3663 | ||
f3ed775e | 3664 | /* |
d063d709 DG |
3665 | * Set open files limit to unlimited. This daemon can open a large number of |
3666 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3667 | */ |
3668 | static void set_ulimit(void) | |
3669 | { | |
3670 | int ret; | |
3671 | struct rlimit lim; | |
3672 | ||
a88df331 | 3673 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3674 | lim.rlim_cur = 65535; |
3675 | lim.rlim_max = 65535; | |
3676 | ||
3677 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3678 | if (ret < 0) { | |
76d7553f | 3679 | PERROR("failed to set open files limit"); |
f3ed775e DG |
3680 | } |
3681 | } | |
3682 | ||
fac6795d DG |
3683 | /* |
3684 | * main | |
3685 | */ | |
3686 | int main(int argc, char **argv) | |
3687 | { | |
fac6795d DG |
3688 | int ret = 0; |
3689 | void *status; | |
b082db07 | 3690 | const char *home_path; |
fac6795d | 3691 | |
335a95b7 MD |
3692 | init_kernel_workarounds(); |
3693 | ||
f6a9efaa DG |
3694 | rcu_register_thread(); |
3695 | ||
7753dea8 | 3696 | setup_consumerd_path(); |
fb09408a | 3697 | |
fac6795d DG |
3698 | /* Parse arguments */ |
3699 | progname = argv[0]; | |
3700 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3701 | goto error; |
fac6795d DG |
3702 | } |
3703 | ||
3704 | /* Daemonize */ | |
3705 | if (opt_daemon) { | |
ceed52b5 MD |
3706 | int i; |
3707 | ||
3708 | /* | |
3709 | * fork | |
3710 | * child: setsid, close FD 0, 1, 2, chdir / | |
3711 | * parent: exit (if fork is successful) | |
3712 | */ | |
53094c05 DG |
3713 | ret = daemon(0, 0); |
3714 | if (ret < 0) { | |
76d7553f | 3715 | PERROR("daemon"); |
cf3af59e | 3716 | goto error; |
53094c05 | 3717 | } |
ceed52b5 MD |
3718 | /* |
3719 | * We are in the child. Make sure all other file | |
3720 | * descriptors are closed, in case we are called with | |
3721 | * more opened file descriptors than the standard ones. | |
3722 | */ | |
3723 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
3724 | (void) close(i); | |
3725 | } | |
3726 | } | |
3727 | ||
3728 | /* Create thread quit pipe */ | |
3729 | if ((ret = init_thread_quit_pipe()) < 0) { | |
3730 | goto error; | |
fac6795d DG |
3731 | } |
3732 | ||
3733 | /* Check if daemon is UID = 0 */ | |
3734 | is_root = !getuid(); | |
3735 | ||
fac6795d | 3736 | if (is_root) { |
990570ed | 3737 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
3738 | |
3739 | /* Create global run dir with root access */ | |
3740 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 3741 | if (ret < 0) { |
cf3af59e | 3742 | goto error; |
d6f42150 DG |
3743 | } |
3744 | ||
fac6795d | 3745 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3746 | snprintf(apps_unix_sock_path, PATH_MAX, |
3747 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3748 | } |
3749 | ||
3750 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3751 | snprintf(client_unix_sock_path, PATH_MAX, |
3752 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3753 | } | |
0fdd1e2c DG |
3754 | |
3755 | /* Set global SHM for ust */ | |
3756 | if (strlen(wait_shm_path) == 0) { | |
3757 | snprintf(wait_shm_path, PATH_MAX, | |
3758 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3759 | } | |
67e40797 | 3760 | |
44a5e5eb DG |
3761 | if (strlen(health_unix_sock_path) == 0) { |
3762 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
3763 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
3764 | } | |
3765 | ||
67e40797 DG |
3766 | /* Setup kernel consumerd path */ |
3767 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 3768 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 3769 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 3770 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
3771 | |
3772 | DBG2("Kernel consumer err path: %s", | |
3773 | kconsumer_data.err_unix_sock_path); | |
3774 | DBG2("Kernel consumer cmd path: %s", | |
3775 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 3776 | } else { |
b082db07 DG |
3777 | home_path = get_home_dir(); |
3778 | if (home_path == NULL) { | |
273ea72c DG |
3779 | /* TODO: Add --socket PATH option */ |
3780 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3781 | ret = -EPERM; |
3782 | goto error; | |
b082db07 DG |
3783 | } |
3784 | ||
67e40797 DG |
3785 | /* |
3786 | * Create rundir from home path. This will create something like | |
3787 | * $HOME/.lttng | |
3788 | */ | |
990570ed | 3789 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
3790 | if (ret < 0) { |
3791 | ret = -ENOMEM; | |
3792 | goto error; | |
3793 | } | |
3794 | ||
3795 | ret = create_lttng_rundir(rundir); | |
3796 | if (ret < 0) { | |
3797 | goto error; | |
3798 | } | |
3799 | ||
fac6795d | 3800 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3801 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3802 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3803 | } |
3804 | ||
3805 | /* Set the cli tool unix socket path */ | |
3806 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3807 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3808 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 3809 | } |
0fdd1e2c DG |
3810 | |
3811 | /* Set global SHM for ust */ | |
3812 | if (strlen(wait_shm_path) == 0) { | |
3813 | snprintf(wait_shm_path, PATH_MAX, | |
3814 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
3815 | } | |
44a5e5eb DG |
3816 | |
3817 | /* Set health check Unix path */ | |
3818 | if (strlen(health_unix_sock_path) == 0) { | |
3819 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
3820 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
3821 | } | |
fac6795d DG |
3822 | } |
3823 | ||
5c827ce0 DG |
3824 | /* Set consumer initial state */ |
3825 | kernel_consumerd_state = CONSUMER_STOPPED; | |
3826 | ust_consumerd_state = CONSUMER_STOPPED; | |
3827 | ||
847177cd DG |
3828 | DBG("Client socket path %s", client_unix_sock_path); |
3829 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
3830 | DBG("LTTng run directory path: %s", rundir); |
3831 | ||
3832 | /* 32 bits consumerd path setup */ | |
3833 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 3834 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 3835 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 3836 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
3837 | |
3838 | DBG2("UST consumer 32 bits err path: %s", | |
3839 | ustconsumer32_data.err_unix_sock_path); | |
3840 | DBG2("UST consumer 32 bits cmd path: %s", | |
3841 | ustconsumer32_data.cmd_unix_sock_path); | |
3842 | ||
3843 | /* 64 bits consumerd path setup */ | |
3844 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 3845 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 3846 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 3847 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
3848 | |
3849 | DBG2("UST consumer 64 bits err path: %s", | |
3850 | ustconsumer64_data.err_unix_sock_path); | |
3851 | DBG2("UST consumer 64 bits cmd path: %s", | |
3852 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 3853 | |
273ea72c | 3854 | /* |
7d8234d9 | 3855 | * See if daemon already exist. |
fac6795d | 3856 | */ |
7d8234d9 | 3857 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 3858 | ERR("Already running daemon.\n"); |
273ea72c | 3859 | /* |
cf3af59e MD |
3860 | * We do not goto exit because we must not cleanup() |
3861 | * because a daemon is already running. | |
ab118b20 | 3862 | */ |
cf3af59e | 3863 | goto error; |
a88df331 DG |
3864 | } |
3865 | ||
1427f9b2 DG |
3866 | /* |
3867 | * Init UST app hash table. Alloc hash table before this point since | |
3868 | * cleanup() can get called after that point. | |
3869 | */ | |
3870 | ust_app_ht_alloc(); | |
3871 | ||
54d01ffb | 3872 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
3873 | |
3874 | /* | |
3875 | * These actions must be executed as root. We do that *after* setting up | |
3876 | * the sockets path because we MUST make the check for another daemon using | |
3877 | * those paths *before* trying to set the kernel consumer sockets and init | |
3878 | * kernel tracer. | |
3879 | */ | |
3880 | if (is_root) { | |
67e40797 | 3881 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
3882 | if (ret < 0) { |
3883 | goto exit; | |
3884 | } | |
3885 | ||
a88df331 | 3886 | /* Setup kernel tracer */ |
4fba7219 DG |
3887 | if (!opt_no_kernel) { |
3888 | init_kernel_tracer(); | |
3889 | } | |
a88df331 DG |
3890 | |
3891 | /* Set ulimit for open files */ | |
3892 | set_ulimit(); | |
fac6795d | 3893 | } |
4063050c MD |
3894 | /* init lttng_fd tracking must be done after set_ulimit. */ |
3895 | lttng_fd_init(); | |
fac6795d | 3896 | |
67e40797 DG |
3897 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
3898 | if (ret < 0) { | |
3899 | goto exit; | |
3900 | } | |
3901 | ||
3902 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
3903 | if (ret < 0) { | |
3904 | goto exit; | |
3905 | } | |
3906 | ||
cf3af59e MD |
3907 | if ((ret = set_signal_handler()) < 0) { |
3908 | goto exit; | |
fac6795d DG |
3909 | } |
3910 | ||
d6f42150 | 3911 | /* Setup the needed unix socket */ |
cf3af59e MD |
3912 | if ((ret = init_daemon_socket()) < 0) { |
3913 | goto exit; | |
fac6795d DG |
3914 | } |
3915 | ||
3916 | /* Set credentials to socket */ | |
be040666 | 3917 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 3918 | goto exit; |
fac6795d DG |
3919 | } |
3920 | ||
5b8719f5 DG |
3921 | /* Get parent pid if -S, --sig-parent is specified. */ |
3922 | if (opt_sig_parent) { | |
3923 | ppid = getppid(); | |
3924 | } | |
3925 | ||
7a485870 | 3926 | /* Setup the kernel pipe for waking up the kernel thread */ |
ef599319 | 3927 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { |
cf3af59e | 3928 | goto exit; |
7a485870 DG |
3929 | } |
3930 | ||
099e26bd | 3931 | /* Setup the thread apps communication pipe. */ |
ef599319 | 3932 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
3933 | goto exit; |
3934 | } | |
3935 | ||
3936 | /* Init UST command queue. */ | |
3937 | cds_wfq_init(&ust_cmd_queue.queue); | |
3938 | ||
273ea72c | 3939 | /* |
54d01ffb DG |
3940 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
3941 | * statically declared in session.c | |
273ea72c | 3942 | */ |
54d01ffb | 3943 | session_list_ptr = session_get_list(); |
b5541356 | 3944 | |
5eb91c98 DG |
3945 | /* Set up max poll set size */ |
3946 | lttng_poll_set_max_size(); | |
3947 | ||
2f77fc4b | 3948 | cmd_init(); |
00e2e675 | 3949 | |
44a5e5eb DG |
3950 | /* Init all health thread counters. */ |
3951 | health_init(&health_thread_cmd); | |
3952 | health_init(&health_thread_kernel); | |
139ac872 | 3953 | health_init(&health_thread_app_manage); |
44a5e5eb DG |
3954 | health_init(&health_thread_app_reg); |
3955 | ||
3956 | /* | |
3957 | * Init health counters of the consumer thread. We do a quick hack here to | |
3958 | * the state of the consumer health is fine even if the thread is not | |
3959 | * started. This is simply to ease our life and has no cost what so ever. | |
3960 | */ | |
3961 | health_init(&kconsumer_data.health); | |
3962 | health_poll_update(&kconsumer_data.health); | |
3963 | health_init(&ustconsumer32_data.health); | |
3964 | health_poll_update(&ustconsumer32_data.health); | |
3965 | health_init(&ustconsumer64_data.health); | |
3966 | health_poll_update(&ustconsumer64_data.health); | |
3967 | ||
3968 | /* Create thread to manage the client socket */ | |
3969 | ret = pthread_create(&health_thread, NULL, | |
3970 | thread_manage_health, (void *) NULL); | |
3971 | if (ret != 0) { | |
3972 | PERROR("pthread_create health"); | |
3973 | goto exit_health; | |
3974 | } | |
3975 | ||
cf3af59e | 3976 | /* Create thread to manage the client socket */ |
099e26bd DG |
3977 | ret = pthread_create(&client_thread, NULL, |
3978 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 3979 | if (ret != 0) { |
76d7553f | 3980 | PERROR("pthread_create clients"); |
cf3af59e MD |
3981 | goto exit_client; |
3982 | } | |
fac6795d | 3983 | |
099e26bd DG |
3984 | /* Create thread to dispatch registration */ |
3985 | ret = pthread_create(&dispatch_thread, NULL, | |
3986 | thread_dispatch_ust_registration, (void *) NULL); | |
3987 | if (ret != 0) { | |
76d7553f | 3988 | PERROR("pthread_create dispatch"); |
099e26bd DG |
3989 | goto exit_dispatch; |
3990 | } | |
3991 | ||
3992 | /* Create thread to manage application registration. */ | |
3993 | ret = pthread_create(®_apps_thread, NULL, | |
3994 | thread_registration_apps, (void *) NULL); | |
3995 | if (ret != 0) { | |
76d7553f | 3996 | PERROR("pthread_create registration"); |
099e26bd DG |
3997 | goto exit_reg_apps; |
3998 | } | |
3999 | ||
cf3af59e | 4000 | /* Create thread to manage application socket */ |
54d01ffb DG |
4001 | ret = pthread_create(&apps_thread, NULL, |
4002 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4003 | if (ret != 0) { |
76d7553f | 4004 | PERROR("pthread_create apps"); |
cf3af59e MD |
4005 | goto exit_apps; |
4006 | } | |
fac6795d | 4007 | |
cf3af59e | 4008 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4009 | ret = pthread_create(&kernel_thread, NULL, |
4010 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4011 | if (ret != 0) { |
76d7553f | 4012 | PERROR("pthread_create kernel"); |
cf3af59e MD |
4013 | goto exit_kernel; |
4014 | } | |
7a485870 | 4015 | |
cf3af59e MD |
4016 | ret = pthread_join(kernel_thread, &status); |
4017 | if (ret != 0) { | |
76d7553f | 4018 | PERROR("pthread_join"); |
cf3af59e | 4019 | goto error; /* join error, exit without cleanup */ |
fac6795d DG |
4020 | } |
4021 | ||
cf3af59e MD |
4022 | exit_kernel: |
4023 | ret = pthread_join(apps_thread, &status); | |
4024 | if (ret != 0) { | |
76d7553f | 4025 | PERROR("pthread_join"); |
cf3af59e MD |
4026 | goto error; /* join error, exit without cleanup */ |
4027 | } | |
fac6795d | 4028 | |
cf3af59e | 4029 | exit_apps: |
099e26bd DG |
4030 | ret = pthread_join(reg_apps_thread, &status); |
4031 | if (ret != 0) { | |
76d7553f | 4032 | PERROR("pthread_join"); |
099e26bd DG |
4033 | goto error; /* join error, exit without cleanup */ |
4034 | } | |
4035 | ||
4036 | exit_reg_apps: | |
4037 | ret = pthread_join(dispatch_thread, &status); | |
4038 | if (ret != 0) { | |
76d7553f | 4039 | PERROR("pthread_join"); |
099e26bd DG |
4040 | goto error; /* join error, exit without cleanup */ |
4041 | } | |
4042 | ||
4043 | exit_dispatch: | |
cf3af59e MD |
4044 | ret = pthread_join(client_thread, &status); |
4045 | if (ret != 0) { | |
76d7553f | 4046 | PERROR("pthread_join"); |
cf3af59e MD |
4047 | goto error; /* join error, exit without cleanup */ |
4048 | } | |
4049 | ||
3bd1e081 | 4050 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4051 | if (ret != 0) { |
76d7553f | 4052 | PERROR("join_consumer"); |
cf3af59e MD |
4053 | goto error; /* join error, exit without cleanup */ |
4054 | } | |
a88df331 | 4055 | |
cf3af59e | 4056 | exit_client: |
44a5e5eb | 4057 | exit_health: |
a88df331 | 4058 | exit: |
cf3af59e MD |
4059 | /* |
4060 | * cleanup() is called when no other thread is running. | |
4061 | */ | |
f6a9efaa | 4062 | rcu_thread_online(); |
cf3af59e | 4063 | cleanup(); |
f6a9efaa DG |
4064 | rcu_thread_offline(); |
4065 | rcu_unregister_thread(); | |
67e40797 | 4066 | if (!ret) { |
cf3af59e | 4067 | exit(EXIT_SUCCESS); |
67e40797 | 4068 | } |
cf3af59e | 4069 | error: |
5e16da05 | 4070 | exit(EXIT_FAILURE); |
fac6795d | 4071 | } |