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> | |
331744e3 | 28 | #include <inttypes.h> |
0fdd1e2c | 29 | #include <sys/mman.h> |
b73401da | 30 | #include <sys/mount.h> |
1e307fab | 31 | #include <sys/resource.h> |
fac6795d DG |
32 | #include <sys/socket.h> |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
0fdd1e2c | 35 | #include <sys/wait.h> |
5c827ce0 | 36 | #include <urcu/uatomic.h> |
fac6795d | 37 | #include <unistd.h> |
3bd1e081 | 38 | #include <config.h> |
fac6795d | 39 | |
990570ed | 40 | #include <common/common.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" |
7972aab2 | 49 | #include "buffer-registry.h" |
54d01ffb | 50 | #include "channel.h" |
2f77fc4b | 51 | #include "cmd.h" |
00e2e675 | 52 | #include "consumer.h" |
099e26bd | 53 | #include "context.h" |
54d01ffb | 54 | #include "event.h" |
4771f025 | 55 | #include "kernel.h" |
f1e16794 | 56 | #include "kernel-consumer.h" |
096102bd | 57 | #include "modprobe.h" |
0fdd1e2c | 58 | #include "shm.h" |
1e307fab | 59 | #include "ust-ctl.h" |
00e2e675 | 60 | #include "ust-consumer.h" |
8e68d1c8 | 61 | #include "utils.h" |
4063050c | 62 | #include "fd-limit.h" |
44a5e5eb | 63 | #include "health.h" |
8ac94142 | 64 | #include "testpoint.h" |
d0b96690 | 65 | #include "ust-thread.h" |
fac6795d | 66 | |
ebaeda94 MD |
67 | #define CONSUMERD_FILE "lttng-consumerd" |
68 | ||
75462a81 | 69 | /* Const values */ |
bbccc3d2 | 70 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab | 71 | |
fac6795d DG |
72 | const char *progname; |
73 | const char *opt_tracing_group; | |
35f90c40 | 74 | static const char *opt_pidfile; |
5b8719f5 | 75 | static int opt_sig_parent; |
97e19046 | 76 | static int opt_verbose_consumer; |
fac6795d | 77 | static int opt_daemon; |
4fba7219 | 78 | static int opt_no_kernel; |
fac6795d | 79 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 80 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 81 | static char *rundir; |
3bd1e081 | 82 | |
a23ec3a7 DG |
83 | /* |
84 | * Consumer daemon specific control data. Every value not initialized here is | |
85 | * set to 0 by the static definition. | |
86 | */ | |
3bd1e081 MD |
87 | static struct consumer_data kconsumer_data = { |
88 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
89 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
90 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
91 | .err_sock = -1, |
92 | .cmd_sock = -1, | |
173af62f DG |
93 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
94 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
95 | .cond = PTHREAD_COND_INITIALIZER, |
96 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 97 | }; |
7753dea8 MD |
98 | static struct consumer_data ustconsumer64_data = { |
99 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
100 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
101 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
102 | .err_sock = -1, |
103 | .cmd_sock = -1, | |
173af62f DG |
104 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
105 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
106 | .cond = PTHREAD_COND_INITIALIZER, |
107 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
108 | }; |
109 | static struct consumer_data ustconsumer32_data = { | |
110 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
111 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
112 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
113 | .err_sock = -1, |
114 | .cmd_sock = -1, | |
173af62f DG |
115 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
116 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
117 | .cond = PTHREAD_COND_INITIALIZER, |
118 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
119 | }; |
120 | ||
26c9d55e | 121 | /* Shared between threads */ |
099e26bd | 122 | static int dispatch_thread_exit; |
fac6795d | 123 | |
54d01ffb DG |
124 | /* Global application Unix socket path */ |
125 | static char apps_unix_sock_path[PATH_MAX]; | |
126 | /* Global client Unix socket path */ | |
127 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
128 | /* global wait shm path for UST */ |
129 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
130 | /* Global health check unix path */ |
131 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 132 | |
1d4b027a | 133 | /* Sockets and FDs */ |
a4b35e07 MD |
134 | static int client_sock = -1; |
135 | static int apps_sock = -1; | |
2f77fc4b | 136 | int kernel_tracer_fd = -1; |
76d7553f | 137 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 138 | |
273ea72c DG |
139 | /* |
140 | * Quit pipe for all threads. This permits a single cancellation point | |
141 | * for all threads when receiving an event on the pipe. | |
142 | */ | |
76d7553f | 143 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 144 | |
099e26bd DG |
145 | /* |
146 | * This pipe is used to inform the thread managing application communication | |
147 | * that a command is queued and ready to be processed. | |
148 | */ | |
76d7553f | 149 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 150 | |
d0b96690 DG |
151 | int apps_cmd_notify_pipe[2] = { -1, -1 }; |
152 | ||
1d4b027a | 153 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 154 | static pthread_t apps_thread; |
d0b96690 | 155 | static pthread_t apps_notify_thread; |
099e26bd | 156 | static pthread_t reg_apps_thread; |
1d4b027a | 157 | static pthread_t client_thread; |
7a485870 | 158 | static pthread_t kernel_thread; |
099e26bd | 159 | static pthread_t dispatch_thread; |
44a5e5eb | 160 | static pthread_t health_thread; |
0b2dc8df | 161 | static pthread_t ht_cleanup_thread; |
5eb91c98 | 162 | |
099e26bd DG |
163 | /* |
164 | * UST registration command queue. This queue is tied with a futex and uses a N | |
165 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
166 | * | |
167 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
168 | * this queue and the wait/wake scheme. | |
169 | */ | |
170 | static struct ust_cmd_queue ust_cmd_queue; | |
171 | ||
b5541356 DG |
172 | /* |
173 | * Pointer initialized before thread creation. | |
174 | * | |
175 | * This points to the tracing session list containing the session count and a | |
176 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
177 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 178 | * |
d063d709 | 179 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 180 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
181 | */ |
182 | static struct ltt_session_list *session_list_ptr; | |
183 | ||
7753dea8 MD |
184 | int ust_consumerd64_fd = -1; |
185 | int ust_consumerd32_fd = -1; | |
186 | ||
fb6f1fa2 YB |
187 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
188 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
189 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
190 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 191 | |
2f77fc4b DG |
192 | static const char *module_proc_lttng = "/proc/lttng"; |
193 | ||
5c827ce0 DG |
194 | /* |
195 | * Consumer daemon state which is changed when spawning it, killing it or in | |
196 | * case of a fatal error. | |
197 | */ | |
198 | enum consumerd_state { | |
199 | CONSUMER_STARTED = 1, | |
200 | CONSUMER_STOPPED = 2, | |
201 | CONSUMER_ERROR = 3, | |
202 | }; | |
203 | ||
204 | /* | |
205 | * This consumer daemon state is used to validate if a client command will be | |
206 | * able to reach the consumer. If not, the client is informed. For instance, | |
207 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
208 | * error to the client. | |
209 | * | |
210 | * The following example shows a possible race condition of this scheme: | |
211 | * | |
212 | * consumer thread error happens | |
213 | * client cmd arrives | |
214 | * client cmd checks state -> still OK | |
215 | * consumer thread exit, sets error | |
216 | * client cmd try to talk to consumer | |
217 | * ... | |
218 | * | |
219 | * However, since the consumer is a different daemon, we have no way of making | |
220 | * sure the command will reach it safely even with this state flag. This is why | |
221 | * we consider that up to the state validation during command processing, the | |
222 | * command is safe. After that, we can not guarantee the correctness of the | |
223 | * client request vis-a-vis the consumer. | |
224 | */ | |
225 | static enum consumerd_state ust_consumerd_state; | |
226 | static enum consumerd_state kernel_consumerd_state; | |
227 | ||
ae9e45b3 DG |
228 | /* |
229 | * Socket timeout for receiving and sending in seconds. | |
230 | */ | |
231 | static int app_socket_timeout; | |
232 | ||
12744796 DG |
233 | /* Set in main() with the current page size. */ |
234 | long page_size; | |
235 | ||
fb09408a | 236 | static |
7753dea8 | 237 | void setup_consumerd_path(void) |
fb09408a | 238 | { |
fc7a59ce | 239 | const char *bin, *libdir; |
fb09408a | 240 | |
7753dea8 MD |
241 | /* |
242 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
243 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
244 | * has not been defined. | |
7753dea8 | 245 | */ |
ebaeda94 | 246 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
247 | if (!consumerd32_bin[0]) { |
248 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
249 | } |
250 | if (!consumerd32_libdir[0]) { | |
251 | consumerd32_libdir = INSTALL_LIB_PATH; | |
252 | } | |
253 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
254 | if (!consumerd64_bin[0]) { |
255 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 256 | } |
ebaeda94 MD |
257 | if (!consumerd64_libdir[0]) { |
258 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
259 | } |
260 | #else | |
261 | #error "Unknown bitness" | |
262 | #endif | |
263 | ||
fb09408a MD |
264 | /* |
265 | * runtime env. var. overrides the build default. | |
266 | */ | |
fc7a59ce AM |
267 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
268 | if (bin) { | |
269 | consumerd32_bin = bin; | |
7753dea8 | 270 | } |
fc7a59ce AM |
271 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
272 | if (bin) { | |
273 | consumerd64_bin = bin; | |
ebaeda94 | 274 | } |
72f579ee | 275 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
276 | if (libdir) { |
277 | consumerd32_libdir = libdir; | |
278 | } | |
72f579ee | 279 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
280 | if (libdir) { |
281 | consumerd64_libdir = libdir; | |
fb09408a MD |
282 | } |
283 | } | |
284 | ||
5eb91c98 DG |
285 | /* |
286 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
287 | */ | |
d0b96690 | 288 | int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size) |
5eb91c98 DG |
289 | { |
290 | int ret; | |
291 | ||
d0b96690 | 292 | assert(events); |
5eb91c98 DG |
293 | |
294 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
295 | if (ret < 0) { | |
296 | goto error; | |
297 | } | |
298 | ||
299 | /* Add quit pipe */ | |
d0b96690 | 300 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
5eb91c98 DG |
301 | if (ret < 0) { |
302 | goto error; | |
303 | } | |
304 | ||
305 | return 0; | |
306 | ||
307 | error: | |
308 | return ret; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Check if the thread quit pipe was triggered. | |
313 | * | |
314 | * Return 1 if it was triggered else 0; | |
315 | */ | |
d0b96690 | 316 | int sessiond_check_thread_quit_pipe(int fd, uint32_t events) |
5eb91c98 DG |
317 | { |
318 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
319 | return 1; | |
320 | } | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
0fdd1e2c DG |
325 | /* |
326 | * Return group ID of the tracing group or -1 if not found. | |
327 | */ | |
996b65c8 MD |
328 | static gid_t allowed_group(void) |
329 | { | |
330 | struct group *grp; | |
331 | ||
274e143b MD |
332 | if (opt_tracing_group) { |
333 | grp = getgrnam(opt_tracing_group); | |
334 | } else { | |
335 | grp = getgrnam(default_tracing_group); | |
336 | } | |
996b65c8 MD |
337 | if (!grp) { |
338 | return -1; | |
339 | } else { | |
340 | return grp->gr_gid; | |
341 | } | |
342 | } | |
343 | ||
273ea72c | 344 | /* |
5eb91c98 | 345 | * Init thread quit pipe. |
273ea72c DG |
346 | * |
347 | * Return -1 on error or 0 if all pipes are created. | |
348 | */ | |
349 | static int init_thread_quit_pipe(void) | |
350 | { | |
730389d9 | 351 | int ret, i; |
273ea72c | 352 | |
730389d9 | 353 | ret = pipe(thread_quit_pipe); |
273ea72c | 354 | if (ret < 0) { |
730389d9 | 355 | PERROR("thread quit pipe"); |
273ea72c DG |
356 | goto error; |
357 | } | |
358 | ||
730389d9 DG |
359 | for (i = 0; i < 2; i++) { |
360 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
361 | if (ret < 0) { | |
362 | PERROR("fcntl"); | |
363 | goto error; | |
364 | } | |
365 | } | |
366 | ||
273ea72c DG |
367 | error: |
368 | return ret; | |
369 | } | |
370 | ||
099e26bd DG |
371 | /* |
372 | * Stop all threads by closing the thread quit pipe. | |
373 | */ | |
cf3af59e MD |
374 | static void stop_threads(void) |
375 | { | |
5eb91c98 DG |
376 | int ret; |
377 | ||
cf3af59e MD |
378 | /* Stopping all threads */ |
379 | DBG("Terminating all threads"); | |
54d01ffb | 380 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
381 | if (ret < 0) { |
382 | ERR("write error on thread quit pipe"); | |
383 | } | |
384 | ||
099e26bd | 385 | /* Dispatch thread */ |
26c9d55e | 386 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 387 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
388 | } |
389 | ||
e975f9f8 DG |
390 | /* |
391 | * Close every consumer sockets. | |
392 | */ | |
393 | static void close_consumer_sockets(void) | |
394 | { | |
395 | int ret; | |
396 | ||
397 | if (kconsumer_data.err_sock >= 0) { | |
398 | ret = close(kconsumer_data.err_sock); | |
399 | if (ret < 0) { | |
400 | PERROR("kernel consumer err_sock close"); | |
401 | } | |
402 | } | |
403 | if (ustconsumer32_data.err_sock >= 0) { | |
404 | ret = close(ustconsumer32_data.err_sock); | |
405 | if (ret < 0) { | |
a76cbd9f | 406 | PERROR("UST consumerd32 err_sock close"); |
e975f9f8 DG |
407 | } |
408 | } | |
409 | if (ustconsumer64_data.err_sock >= 0) { | |
410 | ret = close(ustconsumer64_data.err_sock); | |
411 | if (ret < 0) { | |
a76cbd9f | 412 | PERROR("UST consumerd64 err_sock close"); |
e975f9f8 DG |
413 | } |
414 | } | |
415 | if (kconsumer_data.cmd_sock >= 0) { | |
416 | ret = close(kconsumer_data.cmd_sock); | |
417 | if (ret < 0) { | |
418 | PERROR("kernel consumer cmd_sock close"); | |
419 | } | |
420 | } | |
421 | if (ustconsumer32_data.cmd_sock >= 0) { | |
422 | ret = close(ustconsumer32_data.cmd_sock); | |
423 | if (ret < 0) { | |
a76cbd9f | 424 | PERROR("UST consumerd32 cmd_sock close"); |
e975f9f8 DG |
425 | } |
426 | } | |
427 | if (ustconsumer64_data.cmd_sock >= 0) { | |
428 | ret = close(ustconsumer64_data.cmd_sock); | |
429 | if (ret < 0) { | |
a76cbd9f | 430 | PERROR("UST consumerd64 cmd_sock close"); |
e975f9f8 DG |
431 | } |
432 | } | |
433 | } | |
434 | ||
fac6795d | 435 | /* |
d063d709 | 436 | * Cleanup the daemon |
fac6795d | 437 | */ |
cf3af59e | 438 | static void cleanup(void) |
fac6795d | 439 | { |
ef599319 | 440 | int ret; |
6620da75 | 441 | char *cmd = NULL; |
af9737e9 | 442 | struct ltt_session *sess, *stmp; |
fac6795d | 443 | |
1d4b027a | 444 | DBG("Cleaning up"); |
e07ae692 | 445 | |
4e449f3f MD |
446 | /* |
447 | * Close the thread quit pipe. It has already done its job, | |
448 | * since we are now called. | |
449 | */ | |
2f77fc4b DG |
450 | utils_close_pipe(thread_quit_pipe); |
451 | ||
35f90c40 DG |
452 | /* |
453 | * If opt_pidfile is undefined, the default file will be wiped when | |
454 | * removing the rundir. | |
455 | */ | |
456 | if (opt_pidfile) { | |
457 | ret = remove(opt_pidfile); | |
458 | if (ret < 0) { | |
459 | PERROR("remove pidfile %s", opt_pidfile); | |
460 | } | |
461 | } | |
462 | ||
67e40797 DG |
463 | DBG("Removing %s directory", rundir); |
464 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
465 | if (ret < 0) { | |
466 | ERR("asprintf failed. Something is really wrong!"); | |
467 | } | |
5461b305 | 468 | |
67e40797 DG |
469 | /* Remove lttng run directory */ |
470 | ret = system(cmd); | |
471 | if (ret < 0) { | |
472 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 473 | } |
67e40797 | 474 | free(cmd); |
bd69add2 | 475 | free(rundir); |
5461b305 | 476 | |
99bab54f | 477 | DBG("Cleaning up all sessions"); |
fac6795d | 478 | |
b5541356 | 479 | /* Destroy session list mutex */ |
273ea72c DG |
480 | if (session_list_ptr != NULL) { |
481 | pthread_mutex_destroy(&session_list_ptr->lock); | |
482 | ||
483 | /* Cleanup ALL session */ | |
54d01ffb DG |
484 | cds_list_for_each_entry_safe(sess, stmp, |
485 | &session_list_ptr->head, list) { | |
2f77fc4b | 486 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
487 | } |
488 | } | |
489 | ||
099e26bd | 490 | DBG("Closing all UST sockets"); |
56fff090 | 491 | ust_app_clean_list(); |
7972aab2 | 492 | buffer_reg_destroy_registries(); |
099e26bd | 493 | |
4fba7219 DG |
494 | if (is_root && !opt_no_kernel) { |
495 | DBG2("Closing kernel fd"); | |
a4b35e07 | 496 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
497 | ret = close(kernel_tracer_fd); |
498 | if (ret) { | |
499 | PERROR("close"); | |
500 | } | |
a4b35e07 | 501 | } |
2f50c8a3 | 502 | DBG("Unloading kernel modules"); |
096102bd | 503 | modprobe_remove_lttng_all(); |
2f50c8a3 | 504 | } |
2f77fc4b | 505 | |
e975f9f8 DG |
506 | close_consumer_sockets(); |
507 | ||
421cb601 | 508 | /* <fun> */ |
f56a39af | 509 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
510 | "Matthew, BEET driven development works!%c[%dm", |
511 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
512 | /* </fun> */ | |
fac6795d DG |
513 | } |
514 | ||
e065084a | 515 | /* |
d063d709 | 516 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 517 | * |
d063d709 | 518 | * Return lttcomm error code. |
e065084a DG |
519 | */ |
520 | static int send_unix_sock(int sock, void *buf, size_t len) | |
521 | { | |
522 | /* Check valid length */ | |
c617c0c6 | 523 | if (len == 0) { |
e065084a DG |
524 | return -1; |
525 | } | |
526 | ||
527 | return lttcomm_send_unix_sock(sock, buf, len); | |
528 | } | |
529 | ||
5461b305 | 530 | /* |
d063d709 | 531 | * Free memory of a command context structure. |
5461b305 | 532 | */ |
a2fb29a5 | 533 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 534 | { |
a2fb29a5 DG |
535 | DBG("Clean command context structure"); |
536 | if (*cmd_ctx) { | |
537 | if ((*cmd_ctx)->llm) { | |
538 | free((*cmd_ctx)->llm); | |
5461b305 | 539 | } |
a2fb29a5 DG |
540 | if ((*cmd_ctx)->lsm) { |
541 | free((*cmd_ctx)->lsm); | |
5461b305 | 542 | } |
a2fb29a5 DG |
543 | free(*cmd_ctx); |
544 | *cmd_ctx = NULL; | |
5461b305 DG |
545 | } |
546 | } | |
547 | ||
fac6795d | 548 | /* |
0fdd1e2c | 549 | * Notify UST applications using the shm mmap futex. |
fac6795d | 550 | */ |
0fdd1e2c | 551 | static int notify_ust_apps(int active) |
fac6795d | 552 | { |
0fdd1e2c | 553 | char *wait_shm_mmap; |
fac6795d | 554 | |
0fdd1e2c | 555 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 556 | |
0fdd1e2c DG |
557 | /* See shm.c for this call implying mmap, shm and futex calls */ |
558 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
559 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
560 | goto error; |
561 | } | |
562 | ||
0fdd1e2c DG |
563 | /* Wake waiting process */ |
564 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
565 | ||
566 | /* Apps notified successfully */ | |
567 | return 0; | |
fac6795d DG |
568 | |
569 | error: | |
0fdd1e2c | 570 | return -1; |
fac6795d DG |
571 | } |
572 | ||
e065084a | 573 | /* |
d063d709 DG |
574 | * Setup the outgoing data buffer for the response (llm) by allocating the |
575 | * right amount of memory and copying the original information from the lsm | |
576 | * structure. | |
ca95a216 | 577 | * |
d063d709 | 578 | * Return total size of the buffer pointed by buf. |
ca95a216 | 579 | */ |
5461b305 | 580 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 581 | { |
f3ed775e | 582 | int ret, buf_size; |
ca95a216 | 583 | |
f3ed775e | 584 | buf_size = size; |
5461b305 | 585 | |
ba7f0ae5 | 586 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 587 | if (cmd_ctx->llm == NULL) { |
76d7553f | 588 | PERROR("zmalloc"); |
5461b305 | 589 | ret = -ENOMEM; |
ca95a216 DG |
590 | goto error; |
591 | } | |
592 | ||
5461b305 DG |
593 | /* Copy common data */ |
594 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 595 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 596 | |
5461b305 DG |
597 | cmd_ctx->llm->data_size = size; |
598 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
599 | ||
ca95a216 DG |
600 | return buf_size; |
601 | ||
602 | error: | |
603 | return ret; | |
604 | } | |
605 | ||
7a485870 | 606 | /* |
5eb91c98 | 607 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 608 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 609 | */ |
5eb91c98 | 610 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 611 | { |
5eb91c98 | 612 | int ret; |
7a485870 DG |
613 | struct ltt_session *session; |
614 | struct ltt_kernel_channel *channel; | |
615 | ||
5eb91c98 | 616 | DBG("Updating kernel poll set"); |
7a485870 | 617 | |
54d01ffb | 618 | session_lock_list(); |
b5541356 | 619 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 620 | session_lock(session); |
7a485870 | 621 | if (session->kernel_session == NULL) { |
54d01ffb | 622 | session_unlock(session); |
7a485870 DG |
623 | continue; |
624 | } | |
7a485870 | 625 | |
54d01ffb DG |
626 | cds_list_for_each_entry(channel, |
627 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
628 | /* Add channel fd to the kernel poll set */ |
629 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
630 | if (ret < 0) { | |
54d01ffb | 631 | session_unlock(session); |
5eb91c98 DG |
632 | goto error; |
633 | } | |
634 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 635 | } |
54d01ffb | 636 | session_unlock(session); |
7a485870 | 637 | } |
54d01ffb | 638 | session_unlock_list(); |
7a485870 | 639 | |
5eb91c98 | 640 | return 0; |
7a485870 DG |
641 | |
642 | error: | |
54d01ffb | 643 | session_unlock_list(); |
7a485870 DG |
644 | return -1; |
645 | } | |
646 | ||
647 | /* | |
54d01ffb | 648 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 649 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 650 | * |
d063d709 | 651 | * Useful for CPU hotplug feature. |
7a485870 | 652 | */ |
2bdd86d4 | 653 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
654 | { |
655 | int ret = 0; | |
656 | struct ltt_session *session; | |
173af62f | 657 | struct ltt_kernel_session *ksess; |
7a485870 DG |
658 | struct ltt_kernel_channel *channel; |
659 | ||
660 | DBG("Updating kernel streams for channel fd %d", fd); | |
661 | ||
54d01ffb | 662 | session_lock_list(); |
b5541356 | 663 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 664 | session_lock(session); |
7a485870 | 665 | if (session->kernel_session == NULL) { |
54d01ffb | 666 | session_unlock(session); |
7a485870 DG |
667 | continue; |
668 | } | |
173af62f | 669 | ksess = session->kernel_session; |
d9800920 | 670 | |
173af62f | 671 | cds_list_for_each_entry(channel, &ksess->channel_list.head, list) { |
7a485870 DG |
672 | if (channel->fd == fd) { |
673 | DBG("Channel found, updating kernel streams"); | |
674 | ret = kernel_open_channel_stream(channel); | |
675 | if (ret < 0) { | |
b3c750d2 | 676 | goto error; |
7a485870 | 677 | } |
5c786ded JD |
678 | /* Update the stream global counter */ |
679 | ksess->stream_count_global += ret; | |
d9800920 | 680 | |
7a485870 | 681 | /* |
5eb91c98 DG |
682 | * Have we already sent fds to the consumer? If yes, it means |
683 | * that tracing is started so it is safe to send our updated | |
684 | * stream fds. | |
7a485870 | 685 | */ |
173af62f DG |
686 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
687 | struct lttng_ht_iter iter; | |
688 | struct consumer_socket *socket; | |
689 | ||
e7fe706f | 690 | rcu_read_lock(); |
173af62f DG |
691 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, |
692 | &iter.iter, socket, node.node) { | |
173af62f | 693 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 694 | ret = kernel_consumer_send_channel_stream(socket, |
2bba9e53 DG |
695 | channel, ksess, |
696 | session->output_traces ? 1 : 0); | |
173af62f DG |
697 | pthread_mutex_unlock(socket->lock); |
698 | if (ret < 0) { | |
e7fe706f | 699 | rcu_read_unlock(); |
173af62f DG |
700 | goto error; |
701 | } | |
7a485870 | 702 | } |
e7fe706f | 703 | rcu_read_unlock(); |
7a485870 | 704 | } |
b3c750d2 | 705 | goto error; |
7a485870 DG |
706 | } |
707 | } | |
54d01ffb | 708 | session_unlock(session); |
7a485870 | 709 | } |
54d01ffb | 710 | session_unlock_list(); |
b3c750d2 | 711 | return ret; |
7a485870 | 712 | |
b3c750d2 | 713 | error: |
54d01ffb DG |
714 | session_unlock(session); |
715 | session_unlock_list(); | |
7a485870 DG |
716 | return ret; |
717 | } | |
718 | ||
487cf67c | 719 | /* |
ffe60014 DG |
720 | * For each tracing session, update newly registered apps. The session list |
721 | * lock MUST be acquired before calling this. | |
487cf67c DG |
722 | */ |
723 | static void update_ust_app(int app_sock) | |
724 | { | |
725 | struct ltt_session *sess, *stmp; | |
726 | ||
fdadac08 DG |
727 | /* Consumer is in an ERROR state. Stop any application update. */ |
728 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
729 | /* Stop the update process since the consumer is dead. */ | |
730 | return; | |
731 | } | |
732 | ||
487cf67c DG |
733 | /* For all tracing session(s) */ |
734 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 735 | session_lock(sess); |
421cb601 DG |
736 | if (sess->ust_session) { |
737 | ust_app_global_update(sess->ust_session, app_sock); | |
738 | } | |
4ee14516 | 739 | session_unlock(sess); |
487cf67c DG |
740 | } |
741 | } | |
742 | ||
7a485870 | 743 | /* |
d063d709 | 744 | * This thread manage event coming from the kernel. |
7a485870 | 745 | * |
d063d709 DG |
746 | * Features supported in this thread: |
747 | * -) CPU Hotplug | |
7a485870 DG |
748 | */ |
749 | static void *thread_manage_kernel(void *data) | |
750 | { | |
139ac872 | 751 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 752 | uint32_t revents, nb_fd; |
7a485870 | 753 | char tmp; |
5eb91c98 | 754 | struct lttng_poll_event events; |
7a485870 | 755 | |
6993eeb3 | 756 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 757 | |
927ca06a DG |
758 | health_register(HEALTH_TYPE_KERNEL); |
759 | ||
d5d63bf1 DG |
760 | /* |
761 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 762 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 763 | */ |
6d737ce4 | 764 | lttng_poll_init(&events); |
d5d63bf1 | 765 | |
6993eeb3 CB |
766 | if (testpoint(thread_manage_kernel)) { |
767 | goto error_testpoint; | |
768 | } | |
8ac94142 | 769 | |
840cb59c | 770 | health_code_update(); |
44a5e5eb | 771 | |
6993eeb3 | 772 | if (testpoint(thread_manage_kernel_before_loop)) { |
d21b0d71 | 773 | goto error_testpoint; |
6993eeb3 CB |
774 | } |
775 | ||
7a485870 | 776 | while (1) { |
840cb59c | 777 | health_code_update(); |
44a5e5eb | 778 | |
7a485870 | 779 | if (update_poll_flag == 1) { |
d21b0d71 DG |
780 | /* Clean events object. We are about to populate it again. */ |
781 | lttng_poll_clean(&events); | |
782 | ||
d0b96690 | 783 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
784 | if (ret < 0) { |
785 | goto error_poll_create; | |
786 | } | |
787 | ||
788 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
789 | if (ret < 0) { | |
790 | goto error; | |
791 | } | |
5f822d0a | 792 | |
d21b0d71 | 793 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
794 | ret = update_kernel_poll(&events); |
795 | if (ret < 0) { | |
7a485870 DG |
796 | goto error; |
797 | } | |
798 | update_poll_flag = 0; | |
799 | } | |
800 | ||
d21b0d71 | 801 | DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events)); |
7a485870 DG |
802 | |
803 | /* Poll infinite value of time */ | |
88f2b785 | 804 | restart: |
a78af745 | 805 | health_poll_entry(); |
5eb91c98 | 806 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 807 | health_poll_exit(); |
7a485870 | 808 | if (ret < 0) { |
88f2b785 MD |
809 | /* |
810 | * Restart interrupted system call. | |
811 | */ | |
812 | if (errno == EINTR) { | |
813 | goto restart; | |
814 | } | |
7a485870 DG |
815 | goto error; |
816 | } else if (ret == 0) { | |
817 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
818 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
819 | "This should not have happened! Continuing..."); | |
7a485870 DG |
820 | continue; |
821 | } | |
822 | ||
0d9c5d77 DG |
823 | nb_fd = ret; |
824 | ||
5eb91c98 DG |
825 | for (i = 0; i < nb_fd; i++) { |
826 | /* Fetch once the poll data */ | |
827 | revents = LTTNG_POLL_GETEV(&events, i); | |
828 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 829 | |
840cb59c | 830 | health_code_update(); |
44a5e5eb | 831 | |
5eb91c98 | 832 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 833 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 834 | if (ret) { |
139ac872 MD |
835 | err = 0; |
836 | goto exit; | |
5eb91c98 | 837 | } |
7a485870 | 838 | |
5eb91c98 DG |
839 | /* Check for data on kernel pipe */ |
840 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
f921c78f DG |
841 | do { |
842 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
843 | } while (ret < 0 && errno == EINTR); | |
844 | /* | |
845 | * Ret value is useless here, if this pipe gets any actions an | |
846 | * update is required anyway. | |
847 | */ | |
5eb91c98 DG |
848 | update_poll_flag = 1; |
849 | continue; | |
850 | } else { | |
851 | /* | |
852 | * New CPU detected by the kernel. Adding kernel stream to | |
853 | * kernel session and updating the kernel consumer | |
854 | */ | |
855 | if (revents & LPOLLIN) { | |
2bdd86d4 | 856 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
857 | if (ret < 0) { |
858 | continue; | |
859 | } | |
860 | break; | |
861 | /* | |
862 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
863 | * and unregister kernel stream at this point. | |
864 | */ | |
7a485870 | 865 | } |
7a485870 DG |
866 | } |
867 | } | |
868 | } | |
869 | ||
139ac872 | 870 | exit: |
7a485870 | 871 | error: |
5eb91c98 | 872 | lttng_poll_clean(&events); |
76d7553f | 873 | error_poll_create: |
6993eeb3 | 874 | error_testpoint: |
6620da75 DG |
875 | utils_close_pipe(kernel_poll_pipe); |
876 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 877 | if (err) { |
840cb59c | 878 | health_error(); |
139ac872 | 879 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
880 | WARN("Kernel thread died unexpectedly. " |
881 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 882 | } |
927ca06a | 883 | health_unregister(); |
76d7553f | 884 | DBG("Kernel thread dying"); |
7a485870 DG |
885 | return NULL; |
886 | } | |
887 | ||
a23ec3a7 DG |
888 | /* |
889 | * Signal pthread condition of the consumer data that the thread. | |
890 | */ | |
891 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
892 | { | |
893 | pthread_mutex_lock(&data->cond_mutex); | |
894 | ||
895 | /* | |
896 | * The state is set before signaling. It can be any value, it's the waiter | |
897 | * job to correctly interpret this condition variable associated to the | |
898 | * consumer pthread_cond. | |
899 | * | |
900 | * A value of 0 means that the corresponding thread of the consumer data | |
901 | * was not started. 1 indicates that the thread has started and is ready | |
902 | * for action. A negative value means that there was an error during the | |
903 | * thread bootstrap. | |
904 | */ | |
905 | data->consumer_thread_is_ready = state; | |
906 | (void) pthread_cond_signal(&data->cond); | |
907 | ||
908 | pthread_mutex_unlock(&data->cond_mutex); | |
909 | } | |
910 | ||
1d4b027a | 911 | /* |
3bd1e081 | 912 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 913 | */ |
3bd1e081 | 914 | static void *thread_manage_consumer(void *data) |
1d4b027a | 915 | { |
139ac872 | 916 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 917 | uint32_t revents, nb_fd; |
1d4b027a | 918 | enum lttcomm_return_code code; |
5eb91c98 | 919 | struct lttng_poll_event events; |
3bd1e081 | 920 | struct consumer_data *consumer_data = data; |
1d4b027a | 921 | |
3bd1e081 | 922 | DBG("[thread] Manage consumer started"); |
1d4b027a | 923 | |
927ca06a DG |
924 | health_register(HEALTH_TYPE_CONSUMER); |
925 | ||
855060f8 | 926 | health_code_update(); |
9449cc75 | 927 | |
5eb91c98 | 928 | /* |
331744e3 JD |
929 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
930 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 931 | */ |
331744e3 | 932 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 933 | if (ret < 0) { |
76d7553f | 934 | goto error_poll; |
5eb91c98 | 935 | } |
273ea72c | 936 | |
edb8b045 DG |
937 | /* |
938 | * The error socket here is already in a listening state which was done | |
939 | * just before spawning this thread to avoid a race between the consumer | |
940 | * daemon exec trying to connect and the listen() call. | |
941 | */ | |
3bd1e081 | 942 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
943 | if (ret < 0) { |
944 | goto error; | |
945 | } | |
946 | ||
840cb59c | 947 | health_code_update(); |
44a5e5eb | 948 | |
331744e3 | 949 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 950 | restart: |
a78af745 | 951 | health_poll_entry(); |
8ac94142 | 952 | |
6993eeb3 CB |
953 | if (testpoint(thread_manage_consumer)) { |
954 | goto error; | |
955 | } | |
8ac94142 | 956 | |
5eb91c98 | 957 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 958 | health_poll_exit(); |
273ea72c | 959 | if (ret < 0) { |
88f2b785 MD |
960 | /* |
961 | * Restart interrupted system call. | |
962 | */ | |
963 | if (errno == EINTR) { | |
964 | goto restart; | |
965 | } | |
273ea72c DG |
966 | goto error; |
967 | } | |
968 | ||
0d9c5d77 DG |
969 | nb_fd = ret; |
970 | ||
5eb91c98 DG |
971 | for (i = 0; i < nb_fd; i++) { |
972 | /* Fetch once the poll data */ | |
973 | revents = LTTNG_POLL_GETEV(&events, i); | |
974 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
975 | ||
840cb59c | 976 | health_code_update(); |
44a5e5eb | 977 | |
5eb91c98 | 978 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 979 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 980 | if (ret) { |
139ac872 MD |
981 | err = 0; |
982 | goto exit; | |
5eb91c98 DG |
983 | } |
984 | ||
985 | /* Event on the registration socket */ | |
3bd1e081 | 986 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 987 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 988 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
989 | goto error; |
990 | } | |
991 | } | |
273ea72c DG |
992 | } |
993 | ||
3bd1e081 | 994 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
995 | if (sock < 0) { |
996 | goto error; | |
997 | } | |
998 | ||
b662582b DG |
999 | /* |
1000 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
1001 | * show must go on. | |
1002 | */ | |
1003 | (void) utils_set_fd_cloexec(sock); | |
1004 | ||
840cb59c | 1005 | health_code_update(); |
44a5e5eb | 1006 | |
3bd1e081 | 1007 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1008 | |
712ea556 | 1009 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1010 | ret = lttcomm_recv_unix_sock(sock, &code, |
1011 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1012 | if (ret <= 0) { |
1013 | goto error; | |
1014 | } | |
1015 | ||
840cb59c | 1016 | health_code_update(); |
f73fabfd | 1017 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
331744e3 | 1018 | /* Connect both socket, command and metadata. */ |
3bd1e081 MD |
1019 | consumer_data->cmd_sock = |
1020 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
4ce514c4 | 1021 | consumer_data->metadata_fd = |
331744e3 | 1022 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); |
92db7cdc DG |
1023 | if (consumer_data->cmd_sock < 0 |
1024 | || consumer_data->metadata_fd < 0) { | |
331744e3 | 1025 | PERROR("consumer connect cmd socket"); |
a23ec3a7 DG |
1026 | /* On error, signal condition and quit. */ |
1027 | signal_consumer_condition(consumer_data, -1); | |
1d4b027a DG |
1028 | goto error; |
1029 | } | |
9363801e | 1030 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; |
331744e3 JD |
1031 | /* Create metadata socket lock. */ |
1032 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1033 | if (consumer_data->metadata_sock.lock == NULL) { | |
1034 | PERROR("zmalloc pthread mutex"); | |
1035 | ret = -1; | |
1036 | goto error; | |
1037 | } | |
1038 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1039 | ||
a23ec3a7 | 1040 | signal_consumer_condition(consumer_data, 1); |
331744e3 JD |
1041 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); |
1042 | DBG("Consumer metadata socket ready (fd: %d)", | |
4ce514c4 | 1043 | consumer_data->metadata_fd); |
1d4b027a | 1044 | } else { |
3bd1e081 | 1045 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1046 | lttcomm_get_readable_code(-code)); |
1047 | goto error; | |
1048 | } | |
1049 | ||
331744e3 | 1050 | /* Remove the consumerd error sock since we've established a connexion */ |
3bd1e081 | 1051 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1052 | if (ret < 0) { |
72079cae DG |
1053 | goto error; |
1054 | } | |
1055 | ||
331744e3 | 1056 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1057 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1058 | if (ret < 0) { | |
72079cae | 1059 | goto error; |
5eb91c98 DG |
1060 | } |
1061 | ||
331744e3 | 1062 | /* Add metadata socket that is successfully connected. */ |
4ce514c4 | 1063 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, |
331744e3 JD |
1064 | LPOLLIN | LPOLLRDHUP); |
1065 | if (ret < 0) { | |
1066 | goto error; | |
1067 | } | |
1068 | ||
840cb59c | 1069 | health_code_update(); |
44a5e5eb | 1070 | |
331744e3 | 1071 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1072 | restart_poll: |
331744e3 JD |
1073 | while (1) { |
1074 | health_poll_entry(); | |
1075 | ret = lttng_poll_wait(&events, -1); | |
1076 | health_poll_exit(); | |
1077 | if (ret < 0) { | |
1078 | /* | |
1079 | * Restart interrupted system call. | |
1080 | */ | |
1081 | if (errno == EINTR) { | |
1082 | goto restart_poll; | |
1083 | } | |
1084 | goto error; | |
88f2b785 | 1085 | } |
72079cae | 1086 | |
331744e3 | 1087 | nb_fd = ret; |
0d9c5d77 | 1088 | |
331744e3 JD |
1089 | for (i = 0; i < nb_fd; i++) { |
1090 | /* Fetch once the poll data */ | |
1091 | revents = LTTNG_POLL_GETEV(&events, i); | |
1092 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1093 | |
331744e3 | 1094 | health_code_update(); |
44a5e5eb | 1095 | |
331744e3 JD |
1096 | /* Thread quit pipe has been closed. Killing thread. */ |
1097 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); | |
1098 | if (ret) { | |
1099 | err = 0; | |
1100 | goto exit; | |
1101 | } | |
5eb91c98 | 1102 | |
331744e3 JD |
1103 | if (pollfd == sock) { |
1104 | /* Event on the consumerd socket */ | |
1105 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1106 | ERR("consumer err socket second poll error"); | |
1107 | goto error; | |
1108 | } | |
1109 | health_code_update(); | |
1110 | /* Wait for any kconsumerd error */ | |
1111 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1112 | sizeof(enum lttcomm_return_code)); | |
1113 | if (ret <= 0) { | |
1114 | ERR("consumer closed the command socket"); | |
1115 | goto error; | |
1116 | } | |
1117 | ||
1118 | ERR("consumer return code : %s", | |
1119 | lttcomm_get_readable_code(-code)); | |
1120 | ||
1121 | goto exit; | |
4ce514c4 | 1122 | } else if (pollfd == consumer_data->metadata_fd) { |
331744e3 JD |
1123 | /* UST metadata requests */ |
1124 | ret = ust_consumer_metadata_request( | |
1125 | &consumer_data->metadata_sock); | |
1126 | if (ret < 0) { | |
1127 | ERR("Handling metadata request"); | |
1128 | goto error; | |
1129 | } | |
1130 | break; | |
1131 | } else { | |
1132 | ERR("Unknown pollfd"); | |
5eb91c98 DG |
1133 | goto error; |
1134 | } | |
1135 | } | |
331744e3 | 1136 | health_code_update(); |
5eb91c98 DG |
1137 | } |
1138 | ||
139ac872 | 1139 | exit: |
1d4b027a | 1140 | error: |
fdadac08 DG |
1141 | /* |
1142 | * We lock here because we are about to close the sockets and some other | |
92db7cdc DG |
1143 | * thread might be using them so get exclusive access which will abort all |
1144 | * other consumer command by other threads. | |
fdadac08 DG |
1145 | */ |
1146 | pthread_mutex_lock(&consumer_data->lock); | |
1147 | ||
5c827ce0 DG |
1148 | /* Immediately set the consumerd state to stopped */ |
1149 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1150 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1151 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1152 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1153 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1154 | } else { | |
1155 | /* Code flow error... */ | |
1156 | assert(0); | |
1157 | } | |
1158 | ||
76d7553f MD |
1159 | if (consumer_data->err_sock >= 0) { |
1160 | ret = close(consumer_data->err_sock); | |
1161 | if (ret) { | |
1162 | PERROR("close"); | |
1163 | } | |
a76cbd9f | 1164 | consumer_data->err_sock = -1; |
76d7553f MD |
1165 | } |
1166 | if (consumer_data->cmd_sock >= 0) { | |
1167 | ret = close(consumer_data->cmd_sock); | |
1168 | if (ret) { | |
1169 | PERROR("close"); | |
1170 | } | |
a76cbd9f | 1171 | consumer_data->cmd_sock = -1; |
76d7553f | 1172 | } |
2051fb75 SS |
1173 | if (consumer_data->metadata_sock.fd_ptr && |
1174 | *consumer_data->metadata_sock.fd_ptr >= 0) { | |
9363801e | 1175 | ret = close(*consumer_data->metadata_sock.fd_ptr); |
331744e3 JD |
1176 | if (ret) { |
1177 | PERROR("close"); | |
1178 | } | |
1179 | } | |
76d7553f MD |
1180 | if (sock >= 0) { |
1181 | ret = close(sock); | |
1182 | if (ret) { | |
1183 | PERROR("close"); | |
1184 | } | |
1185 | } | |
273ea72c | 1186 | |
3bd1e081 MD |
1187 | unlink(consumer_data->err_unix_sock_path); |
1188 | unlink(consumer_data->cmd_unix_sock_path); | |
1189 | consumer_data->pid = 0; | |
fdadac08 | 1190 | pthread_mutex_unlock(&consumer_data->lock); |
92db7cdc | 1191 | |
fdadac08 | 1192 | /* Cleanup metadata socket mutex. */ |
2051fb75 SS |
1193 | if (consumer_data->metadata_sock.lock) { |
1194 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1195 | free(consumer_data->metadata_sock.lock); | |
1196 | } | |
5eb91c98 | 1197 | lttng_poll_clean(&events); |
76d7553f | 1198 | error_poll: |
139ac872 | 1199 | if (err) { |
840cb59c | 1200 | health_error(); |
139ac872 MD |
1201 | ERR("Health error occurred in %s", __func__); |
1202 | } | |
927ca06a | 1203 | health_unregister(); |
76d7553f | 1204 | DBG("consumer thread cleanup completed"); |
0177d773 | 1205 | |
5eb91c98 | 1206 | return NULL; |
099e26bd DG |
1207 | } |
1208 | ||
099e26bd DG |
1209 | /* |
1210 | * This thread manage application communication. | |
1d4b027a DG |
1211 | */ |
1212 | static void *thread_manage_apps(void *data) | |
099e26bd | 1213 | { |
139ac872 | 1214 | int i, ret, pollfd, err = -1; |
5eb91c98 | 1215 | uint32_t revents, nb_fd; |
5eb91c98 | 1216 | struct lttng_poll_event events; |
099e26bd DG |
1217 | |
1218 | DBG("[thread] Manage application started"); | |
1219 | ||
f6a9efaa DG |
1220 | rcu_register_thread(); |
1221 | rcu_thread_online(); | |
1222 | ||
927ca06a DG |
1223 | health_register(HEALTH_TYPE_APP_MANAGE); |
1224 | ||
6993eeb3 CB |
1225 | if (testpoint(thread_manage_apps)) { |
1226 | goto error_testpoint; | |
1227 | } | |
1228 | ||
840cb59c | 1229 | health_code_update(); |
44a5e5eb | 1230 | |
d0b96690 | 1231 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1232 | if (ret < 0) { |
76d7553f | 1233 | goto error_poll_create; |
5eb91c98 | 1234 | } |
099e26bd | 1235 | |
5eb91c98 DG |
1236 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1237 | if (ret < 0) { | |
1238 | goto error; | |
1239 | } | |
099e26bd | 1240 | |
6993eeb3 CB |
1241 | if (testpoint(thread_manage_apps_before_loop)) { |
1242 | goto error; | |
1243 | } | |
8ac94142 | 1244 | |
840cb59c | 1245 | health_code_update(); |
44a5e5eb | 1246 | |
5eb91c98 | 1247 | while (1) { |
d21b0d71 | 1248 | DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events)); |
099e26bd DG |
1249 | |
1250 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1251 | restart: |
a78af745 | 1252 | health_poll_entry(); |
5eb91c98 | 1253 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1254 | health_poll_exit(); |
099e26bd | 1255 | if (ret < 0) { |
88f2b785 MD |
1256 | /* |
1257 | * Restart interrupted system call. | |
1258 | */ | |
1259 | if (errno == EINTR) { | |
1260 | goto restart; | |
1261 | } | |
099e26bd DG |
1262 | goto error; |
1263 | } | |
1264 | ||
0d9c5d77 DG |
1265 | nb_fd = ret; |
1266 | ||
5eb91c98 DG |
1267 | for (i = 0; i < nb_fd; i++) { |
1268 | /* Fetch once the poll data */ | |
1269 | revents = LTTNG_POLL_GETEV(&events, i); | |
1270 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1271 | ||
840cb59c | 1272 | health_code_update(); |
44a5e5eb | 1273 | |
5eb91c98 | 1274 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1275 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1276 | if (ret) { |
139ac872 MD |
1277 | err = 0; |
1278 | goto exit; | |
5eb91c98 | 1279 | } |
099e26bd | 1280 | |
5eb91c98 DG |
1281 | /* Inspect the apps cmd pipe */ |
1282 | if (pollfd == apps_cmd_pipe[0]) { | |
1283 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1284 | ERR("Apps command pipe error"); | |
0177d773 | 1285 | goto error; |
5eb91c98 | 1286 | } else if (revents & LPOLLIN) { |
d0b96690 DG |
1287 | int sock; |
1288 | ||
5eb91c98 | 1289 | /* Empty pipe */ |
f921c78f | 1290 | do { |
d0b96690 | 1291 | ret = read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
f921c78f | 1292 | } while (ret < 0 && errno == EINTR); |
d0b96690 | 1293 | if (ret < 0 || ret < sizeof(sock)) { |
76d7553f | 1294 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1295 | goto error; |
1296 | } | |
099e26bd | 1297 | |
840cb59c | 1298 | health_code_update(); |
44a5e5eb | 1299 | |
ffe60014 | 1300 | /* |
d0b96690 DG |
1301 | * We only monitor the error events of the socket. This |
1302 | * thread does not handle any incoming data from UST | |
1303 | * (POLLIN). | |
ffe60014 | 1304 | */ |
d0b96690 DG |
1305 | ret = lttng_poll_add(&events, sock, |
1306 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1307 | if (ret < 0) { | |
5eb91c98 | 1308 | goto error; |
e0c7ec2b | 1309 | } |
acc7b41b | 1310 | |
d0b96690 | 1311 | DBG("Apps with sock %d added to poll set", sock); |
0177d773 | 1312 | } |
5eb91c98 DG |
1313 | } else { |
1314 | /* | |
54d01ffb DG |
1315 | * At this point, we know that a registered application made |
1316 | * the event at poll_wait. | |
5eb91c98 DG |
1317 | */ |
1318 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1319 | /* Removing from the poll set */ | |
1320 | ret = lttng_poll_del(&events, pollfd); | |
1321 | if (ret < 0) { | |
1322 | goto error; | |
1323 | } | |
099e26bd | 1324 | |
b9d9b220 | 1325 | /* Socket closed on remote end. */ |
56fff090 | 1326 | ust_app_unregister(pollfd); |
5eb91c98 | 1327 | } |
099e26bd | 1328 | } |
44a5e5eb | 1329 | |
840cb59c | 1330 | health_code_update(); |
099e26bd | 1331 | } |
099e26bd DG |
1332 | } |
1333 | ||
139ac872 | 1334 | exit: |
099e26bd | 1335 | error: |
5eb91c98 | 1336 | lttng_poll_clean(&events); |
76d7553f | 1337 | error_poll_create: |
6993eeb3 | 1338 | error_testpoint: |
6620da75 DG |
1339 | utils_close_pipe(apps_cmd_pipe); |
1340 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1341 | ||
1342 | /* | |
1343 | * We don't clean the UST app hash table here since already registered | |
1344 | * applications can still be controlled so let them be until the session | |
1345 | * daemon dies or the applications stop. | |
1346 | */ | |
1347 | ||
139ac872 | 1348 | if (err) { |
840cb59c | 1349 | health_error(); |
139ac872 MD |
1350 | ERR("Health error occurred in %s", __func__); |
1351 | } | |
927ca06a | 1352 | health_unregister(); |
76d7553f | 1353 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1354 | rcu_thread_offline(); |
1355 | rcu_unregister_thread(); | |
099e26bd DG |
1356 | return NULL; |
1357 | } | |
1358 | ||
d0b96690 | 1359 | /* |
d88aee68 DG |
1360 | * Send a socket to a thread This is called from the dispatch UST registration |
1361 | * thread once all sockets are set for the application. | |
d0b96690 | 1362 | * |
b85dc84c DG |
1363 | * The sock value can be invalid, we don't really care, the thread will handle |
1364 | * it and make the necessary cleanup if so. | |
1365 | * | |
d0b96690 DG |
1366 | * On success, return 0 else a negative value being the errno message of the |
1367 | * write(). | |
1368 | */ | |
d88aee68 | 1369 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 DG |
1370 | { |
1371 | int ret; | |
1372 | ||
b85dc84c DG |
1373 | /* |
1374 | * It's possible that the FD is set as invalid with -1 concurrently just | |
1375 | * before calling this function being a shutdown state of the thread. | |
1376 | */ | |
1377 | if (fd < 0) { | |
1378 | ret = -EBADF; | |
1379 | goto error; | |
1380 | } | |
d0b96690 DG |
1381 | |
1382 | do { | |
d88aee68 | 1383 | ret = write(fd, &sock, sizeof(sock)); |
d0b96690 | 1384 | } while (ret < 0 && errno == EINTR); |
d88aee68 DG |
1385 | if (ret < 0 || ret != sizeof(sock)) { |
1386 | PERROR("write apps pipe %d", fd); | |
d0b96690 DG |
1387 | if (ret < 0) { |
1388 | ret = -errno; | |
1389 | } | |
1390 | goto error; | |
1391 | } | |
1392 | ||
1393 | /* All good. Don't send back the write positive ret value. */ | |
1394 | ret = 0; | |
1395 | error: | |
1396 | return ret; | |
1397 | } | |
1398 | ||
f45e313d DG |
1399 | /* |
1400 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1401 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1402 | * notify socket is never received. | |
1403 | */ | |
1404 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1405 | { | |
1406 | int ret, nb_fd = 0, i; | |
1407 | unsigned int fd_added = 0; | |
1408 | struct lttng_poll_event events; | |
1409 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1410 | ||
1411 | assert(wait_queue); | |
1412 | ||
1413 | lttng_poll_init(&events); | |
1414 | ||
1415 | /* Just skip everything for an empty queue. */ | |
1416 | if (!wait_queue->count) { | |
1417 | goto end; | |
1418 | } | |
1419 | ||
1420 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1421 | if (ret < 0) { | |
1422 | goto error_create; | |
1423 | } | |
1424 | ||
1425 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1426 | &wait_queue->head, head) { | |
1427 | assert(wait_node->app); | |
1428 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1429 | LPOLLHUP | LPOLLERR); | |
1430 | if (ret < 0) { | |
1431 | goto error; | |
1432 | } | |
1433 | ||
1434 | fd_added = 1; | |
1435 | } | |
1436 | ||
1437 | if (!fd_added) { | |
1438 | goto end; | |
1439 | } | |
1440 | ||
1441 | /* | |
1442 | * Poll but don't block so we can quickly identify the faulty events and | |
1443 | * clean them afterwards from the wait queue. | |
1444 | */ | |
1445 | ret = lttng_poll_wait(&events, 0); | |
1446 | if (ret < 0) { | |
1447 | goto error; | |
1448 | } | |
1449 | nb_fd = ret; | |
1450 | ||
1451 | for (i = 0; i < nb_fd; i++) { | |
1452 | /* Get faulty FD. */ | |
1453 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1454 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1455 | ||
1456 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1457 | &wait_queue->head, head) { | |
1458 | if (pollfd == wait_node->app->sock && | |
1459 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1460 | cds_list_del(&wait_node->head); | |
1461 | wait_queue->count--; | |
1462 | ust_app_destroy(wait_node->app); | |
1463 | free(wait_node); | |
1464 | break; | |
1465 | } | |
1466 | } | |
1467 | } | |
1468 | ||
1469 | if (nb_fd > 0) { | |
1470 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1471 | } | |
1472 | ||
1473 | end: | |
1474 | lttng_poll_clean(&events); | |
1475 | return; | |
1476 | ||
1477 | error: | |
1478 | lttng_poll_clean(&events); | |
1479 | error_create: | |
1480 | ERR("Unable to sanitize wait queue"); | |
1481 | return; | |
1482 | } | |
1483 | ||
099e26bd DG |
1484 | /* |
1485 | * Dispatch request from the registration threads to the application | |
1486 | * communication thread. | |
1487 | */ | |
1488 | static void *thread_dispatch_ust_registration(void *data) | |
1489 | { | |
12e2b881 | 1490 | int ret, err = -1; |
099e26bd DG |
1491 | struct cds_wfq_node *node; |
1492 | struct ust_command *ust_cmd = NULL; | |
f45e313d DG |
1493 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1494 | struct ust_reg_wait_queue wait_queue = { | |
1495 | .count = 0, | |
1496 | }; | |
d0b96690 | 1497 | |
12e2b881 MD |
1498 | health_register(HEALTH_TYPE_APP_REG_DISPATCH); |
1499 | ||
1500 | health_code_update(); | |
1501 | ||
f45e313d | 1502 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1503 | |
1504 | DBG("[thread] Dispatch UST command started"); | |
1505 | ||
26c9d55e | 1506 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
12e2b881 MD |
1507 | health_code_update(); |
1508 | ||
099e26bd DG |
1509 | /* Atomically prepare the queue futex */ |
1510 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1511 | ||
1512 | do { | |
d0b96690 | 1513 | struct ust_app *app = NULL; |
7972aab2 | 1514 | ust_cmd = NULL; |
d0b96690 | 1515 | |
f45e313d DG |
1516 | /* |
1517 | * Make sure we don't have node(s) that have hung up before receiving | |
1518 | * the notify socket. This is to clean the list in order to avoid | |
1519 | * memory leaks from notify socket that are never seen. | |
1520 | */ | |
1521 | sanitize_wait_queue(&wait_queue); | |
1522 | ||
12e2b881 | 1523 | health_code_update(); |
099e26bd DG |
1524 | /* Dequeue command for registration */ |
1525 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1526 | if (node == NULL) { | |
00a17c97 | 1527 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1528 | /* Continue thread execution */ |
1529 | break; | |
1530 | } | |
1531 | ||
1532 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1533 | ||
2f50c8a3 DG |
1534 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1535 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1536 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1537 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1538 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1539 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1540 | |
1541 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1542 | wait_node = zmalloc(sizeof(*wait_node)); | |
1543 | if (!wait_node) { | |
1544 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1545 | ret = close(ust_cmd->sock); |
1546 | if (ret < 0) { | |
1547 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1548 | } | |
2f51ddea | 1549 | lttng_fd_put(LTTNG_FD_APPS, 1); |
7972aab2 | 1550 | free(ust_cmd); |
d0b96690 DG |
1551 | goto error; |
1552 | } | |
1553 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1554 | ||
1555 | /* Create application object if socket is CMD. */ | |
1556 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1557 | ust_cmd->sock); | |
1558 | if (!wait_node->app) { | |
1559 | ret = close(ust_cmd->sock); | |
1560 | if (ret < 0) { | |
1561 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1562 | } |
2f51ddea | 1563 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 1564 | free(wait_node); |
7972aab2 | 1565 | free(ust_cmd); |
d0b96690 DG |
1566 | continue; |
1567 | } | |
1568 | /* | |
1569 | * Add application to the wait queue so we can set the notify | |
1570 | * socket before putting this object in the global ht. | |
1571 | */ | |
f45e313d DG |
1572 | cds_list_add(&wait_node->head, &wait_queue.head); |
1573 | wait_queue.count++; | |
d0b96690 | 1574 | |
7972aab2 | 1575 | free(ust_cmd); |
d0b96690 DG |
1576 | /* |
1577 | * We have to continue here since we don't have the notify | |
1578 | * socket and the application MUST be added to the hash table | |
1579 | * only at that moment. | |
1580 | */ | |
1581 | continue; | |
1582 | } else { | |
1583 | /* | |
1584 | * Look for the application in the local wait queue and set the | |
1585 | * notify socket if found. | |
1586 | */ | |
d88aee68 | 1587 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1588 | &wait_queue.head, head) { |
12e2b881 | 1589 | health_code_update(); |
d0b96690 DG |
1590 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1591 | wait_node->app->notify_sock = ust_cmd->sock; | |
1592 | cds_list_del(&wait_node->head); | |
f45e313d | 1593 | wait_queue.count--; |
d0b96690 DG |
1594 | app = wait_node->app; |
1595 | free(wait_node); | |
1596 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1597 | break; | |
1598 | } | |
1599 | } | |
020d7f60 DG |
1600 | |
1601 | /* | |
1602 | * With no application at this stage the received socket is | |
1603 | * basically useless so close it before we free the cmd data | |
1604 | * structure for good. | |
1605 | */ | |
1606 | if (!app) { | |
1607 | ret = close(ust_cmd->sock); | |
1608 | if (ret < 0) { | |
1609 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1610 | } | |
2f51ddea | 1611 | lttng_fd_put(LTTNG_FD_APPS, 1); |
020d7f60 | 1612 | } |
7972aab2 | 1613 | free(ust_cmd); |
d0b96690 DG |
1614 | } |
1615 | ||
1616 | if (app) { | |
d0b96690 DG |
1617 | /* |
1618 | * @session_lock_list | |
1619 | * | |
1620 | * Lock the global session list so from the register up to the | |
1621 | * registration done message, no thread can see the application | |
1622 | * and change its state. | |
1623 | */ | |
1624 | session_lock_list(); | |
1625 | rcu_read_lock(); | |
d88aee68 | 1626 | |
d0b96690 DG |
1627 | /* |
1628 | * Add application to the global hash table. This needs to be | |
1629 | * done before the update to the UST registry can locate the | |
1630 | * application. | |
1631 | */ | |
1632 | ust_app_add(app); | |
d88aee68 DG |
1633 | |
1634 | /* Set app version. This call will print an error if needed. */ | |
1635 | (void) ust_app_version(app); | |
1636 | ||
1637 | /* Send notify socket through the notify pipe. */ | |
1638 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1639 | app->notify_sock); | |
1640 | if (ret < 0) { | |
1641 | rcu_read_unlock(); | |
1642 | session_unlock_list(); | |
b85dc84c DG |
1643 | /* |
1644 | * No notify thread, stop the UST tracing. However, this is | |
1645 | * not an internal error of the this thread thus setting | |
1646 | * the health error code to a normal exit. | |
1647 | */ | |
1648 | err = 0; | |
d88aee68 | 1649 | goto error; |
6620da75 | 1650 | } |
d88aee68 | 1651 | |
d0b96690 DG |
1652 | /* |
1653 | * Update newly registered application with the tracing | |
1654 | * registry info already enabled information. | |
1655 | */ | |
1656 | update_ust_app(app->sock); | |
d88aee68 DG |
1657 | |
1658 | /* | |
1659 | * Don't care about return value. Let the manage apps threads | |
1660 | * handle app unregistration upon socket close. | |
1661 | */ | |
1662 | (void) ust_app_register_done(app->sock); | |
1663 | ||
1664 | /* | |
1665 | * Even if the application socket has been closed, send the app | |
1666 | * to the thread and unregistration will take place at that | |
1667 | * place. | |
1668 | */ | |
1669 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1670 | if (ret < 0) { |
d88aee68 DG |
1671 | rcu_read_unlock(); |
1672 | session_unlock_list(); | |
b85dc84c DG |
1673 | /* |
1674 | * No apps. thread, stop the UST tracing. However, this is | |
1675 | * not an internal error of the this thread thus setting | |
1676 | * the health error code to a normal exit. | |
1677 | */ | |
1678 | err = 0; | |
d88aee68 | 1679 | goto error; |
d0b96690 | 1680 | } |
d88aee68 | 1681 | |
d0b96690 DG |
1682 | rcu_read_unlock(); |
1683 | session_unlock_list(); | |
099e26bd | 1684 | } |
099e26bd DG |
1685 | } while (node != NULL); |
1686 | ||
12e2b881 | 1687 | health_poll_entry(); |
099e26bd DG |
1688 | /* Futex wait on queue. Blocking call on futex() */ |
1689 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 1690 | health_poll_exit(); |
099e26bd | 1691 | } |
12e2b881 MD |
1692 | /* Normal exit, no error */ |
1693 | err = 0; | |
099e26bd DG |
1694 | |
1695 | error: | |
d88aee68 DG |
1696 | /* Clean up wait queue. */ |
1697 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 1698 | &wait_queue.head, head) { |
d88aee68 | 1699 | cds_list_del(&wait_node->head); |
f45e313d | 1700 | wait_queue.count--; |
d88aee68 DG |
1701 | free(wait_node); |
1702 | } | |
1703 | ||
099e26bd | 1704 | DBG("Dispatch thread dying"); |
12e2b881 MD |
1705 | if (err) { |
1706 | health_error(); | |
1707 | ERR("Health error occurred in %s", __func__); | |
1708 | } | |
1709 | health_unregister(); | |
099e26bd DG |
1710 | return NULL; |
1711 | } | |
1712 | ||
1713 | /* | |
1714 | * This thread manage application registration. | |
1715 | */ | |
1716 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1717 | { |
139ac872 | 1718 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1719 | uint32_t revents, nb_fd; |
1720 | struct lttng_poll_event events; | |
099e26bd DG |
1721 | /* |
1722 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1723 | * freed in the manage apps thread. | |
1724 | */ | |
1725 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1726 | |
099e26bd | 1727 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1728 | |
927ca06a DG |
1729 | health_register(HEALTH_TYPE_APP_REG); |
1730 | ||
6993eeb3 CB |
1731 | if (testpoint(thread_registration_apps)) { |
1732 | goto error_testpoint; | |
1733 | } | |
8ac94142 | 1734 | |
1d4b027a DG |
1735 | ret = lttcomm_listen_unix_sock(apps_sock); |
1736 | if (ret < 0) { | |
76d7553f | 1737 | goto error_listen; |
1d4b027a DG |
1738 | } |
1739 | ||
5eb91c98 DG |
1740 | /* |
1741 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1742 | * more will be added to this poll set. | |
1743 | */ | |
d0b96690 | 1744 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1745 | if (ret < 0) { |
76d7553f | 1746 | goto error_create_poll; |
5eb91c98 | 1747 | } |
273ea72c | 1748 | |
5eb91c98 DG |
1749 | /* Add the application registration socket */ |
1750 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1751 | if (ret < 0) { | |
76d7553f | 1752 | goto error_poll_add; |
5eb91c98 | 1753 | } |
273ea72c | 1754 | |
1d4b027a | 1755 | /* Notify all applications to register */ |
0fdd1e2c DG |
1756 | ret = notify_ust_apps(1); |
1757 | if (ret < 0) { | |
1758 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1759 | "Execution continues but there might be problem for already\n" |
1760 | "running applications that wishes to register."); | |
0fdd1e2c | 1761 | } |
1d4b027a DG |
1762 | |
1763 | while (1) { | |
1764 | DBG("Accepting application registration"); | |
273ea72c DG |
1765 | |
1766 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1767 | restart: |
a78af745 | 1768 | health_poll_entry(); |
5eb91c98 | 1769 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1770 | health_poll_exit(); |
273ea72c | 1771 | if (ret < 0) { |
88f2b785 MD |
1772 | /* |
1773 | * Restart interrupted system call. | |
1774 | */ | |
1775 | if (errno == EINTR) { | |
1776 | goto restart; | |
1777 | } | |
273ea72c DG |
1778 | goto error; |
1779 | } | |
1780 | ||
0d9c5d77 DG |
1781 | nb_fd = ret; |
1782 | ||
5eb91c98 | 1783 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 1784 | health_code_update(); |
139ac872 | 1785 | |
5eb91c98 DG |
1786 | /* Fetch once the poll data */ |
1787 | revents = LTTNG_POLL_GETEV(&events, i); | |
1788 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1789 | |
5eb91c98 | 1790 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1791 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1792 | if (ret) { |
139ac872 MD |
1793 | err = 0; |
1794 | goto exit; | |
90014c57 | 1795 | } |
1d4b027a | 1796 | |
5eb91c98 DG |
1797 | /* Event on the registration socket */ |
1798 | if (pollfd == apps_sock) { | |
1799 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1800 | ERR("Register apps socket poll error"); | |
1801 | goto error; | |
1802 | } else if (revents & LPOLLIN) { | |
1803 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1804 | if (sock < 0) { | |
1805 | goto error; | |
1806 | } | |
099e26bd | 1807 | |
dbc204f1 DG |
1808 | /* |
1809 | * Set socket timeout for both receiving and ending. | |
1810 | * app_socket_timeout is in seconds, whereas | |
1811 | * lttcomm_setsockopt_rcv_timeout and | |
1812 | * lttcomm_setsockopt_snd_timeout expect msec as | |
1813 | * parameter. | |
1814 | */ | |
1815 | (void) lttcomm_setsockopt_rcv_timeout(sock, | |
1816 | app_socket_timeout * 1000); | |
1817 | (void) lttcomm_setsockopt_snd_timeout(sock, | |
1818 | app_socket_timeout * 1000); | |
1819 | ||
b662582b DG |
1820 | /* |
1821 | * Set the CLOEXEC flag. Return code is useless because | |
1822 | * either way, the show must go on. | |
1823 | */ | |
1824 | (void) utils_set_fd_cloexec(sock); | |
1825 | ||
5eb91c98 | 1826 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1827 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1828 | if (ust_cmd == NULL) { |
76d7553f | 1829 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1830 | goto error; |
1831 | } | |
1d4b027a | 1832 | |
5eb91c98 DG |
1833 | /* |
1834 | * Using message-based transmissions to ensure we don't | |
1835 | * have to deal with partially received messages. | |
1836 | */ | |
4063050c MD |
1837 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1838 | if (ret < 0) { | |
1839 | ERR("Exhausted file descriptors allowed for applications."); | |
1840 | free(ust_cmd); | |
1841 | ret = close(sock); | |
1842 | if (ret) { | |
1843 | PERROR("close"); | |
1844 | } | |
1845 | sock = -1; | |
1846 | continue; | |
1847 | } | |
d88aee68 | 1848 | |
840cb59c | 1849 | health_code_update(); |
d0b96690 DG |
1850 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
1851 | if (ret < 0) { | |
5eb91c98 | 1852 | free(ust_cmd); |
d0b96690 | 1853 | /* Close socket of the application. */ |
76d7553f MD |
1854 | ret = close(sock); |
1855 | if (ret) { | |
1856 | PERROR("close"); | |
1857 | } | |
4063050c | 1858 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1859 | sock = -1; |
5eb91c98 DG |
1860 | continue; |
1861 | } | |
840cb59c | 1862 | health_code_update(); |
099e26bd | 1863 | |
5eb91c98 | 1864 | ust_cmd->sock = sock; |
34a2494f | 1865 | sock = -1; |
099e26bd | 1866 | |
5eb91c98 DG |
1867 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1868 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1869 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1870 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1871 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1872 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1873 | |
5eb91c98 DG |
1874 | /* |
1875 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1876 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1877 | */ |
1878 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1879 | ||
1880 | /* | |
1881 | * Wake the registration queue futex. Implicit memory | |
1882 | * barrier with the exchange in cds_wfq_enqueue. | |
1883 | */ | |
1884 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1885 | } | |
1886 | } | |
90014c57 | 1887 | } |
1d4b027a DG |
1888 | } |
1889 | ||
139ac872 | 1890 | exit: |
1d4b027a | 1891 | error: |
139ac872 | 1892 | if (err) { |
840cb59c | 1893 | health_error(); |
139ac872 MD |
1894 | ERR("Health error occurred in %s", __func__); |
1895 | } | |
139ac872 | 1896 | |
0fdd1e2c DG |
1897 | /* Notify that the registration thread is gone */ |
1898 | notify_ust_apps(0); | |
1899 | ||
a4b35e07 | 1900 | if (apps_sock >= 0) { |
76d7553f MD |
1901 | ret = close(apps_sock); |
1902 | if (ret) { | |
1903 | PERROR("close"); | |
1904 | } | |
a4b35e07 | 1905 | } |
46c3f085 | 1906 | if (sock >= 0) { |
76d7553f MD |
1907 | ret = close(sock); |
1908 | if (ret) { | |
1909 | PERROR("close"); | |
1910 | } | |
4063050c | 1911 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1912 | } |
273ea72c | 1913 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1914 | |
76d7553f | 1915 | error_poll_add: |
5eb91c98 | 1916 | lttng_poll_clean(&events); |
76d7553f MD |
1917 | error_listen: |
1918 | error_create_poll: | |
6993eeb3 | 1919 | error_testpoint: |
76d7553f | 1920 | DBG("UST Registration thread cleanup complete"); |
927ca06a | 1921 | health_unregister(); |
5eb91c98 | 1922 | |
1d4b027a DG |
1923 | return NULL; |
1924 | } | |
1925 | ||
8c0faa1d | 1926 | /* |
3bd1e081 | 1927 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1928 | * exec or it will fails. |
8c0faa1d | 1929 | */ |
3bd1e081 | 1930 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 1931 | { |
a23ec3a7 | 1932 | int ret, clock_ret; |
ee0b0061 DG |
1933 | struct timespec timeout; |
1934 | ||
a23ec3a7 DG |
1935 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
1936 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 1937 | |
a23ec3a7 DG |
1938 | /* Setup pthread condition */ |
1939 | ret = pthread_condattr_init(&consumer_data->condattr); | |
1940 | if (ret != 0) { | |
1941 | errno = ret; | |
1942 | PERROR("pthread_condattr_init consumer data"); | |
1943 | goto error; | |
1944 | } | |
1945 | ||
1946 | /* | |
1947 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
1948 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
1949 | * for a more details and how we noticed it. | |
1950 | */ | |
1951 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
1952 | if (ret != 0) { | |
1953 | errno = ret; | |
1954 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
1955 | goto error; |
1956 | } | |
8c0faa1d | 1957 | |
a23ec3a7 DG |
1958 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
1959 | if (ret != 0) { | |
1960 | errno = ret; | |
1961 | PERROR("pthread_cond_init consumer data"); | |
1962 | goto error; | |
1963 | } | |
1964 | ||
1965 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
1966 | consumer_data); | |
8c0faa1d | 1967 | if (ret != 0) { |
3bd1e081 | 1968 | PERROR("pthread_create consumer"); |
ee0b0061 | 1969 | ret = -1; |
8c0faa1d DG |
1970 | goto error; |
1971 | } | |
1972 | ||
a23ec3a7 DG |
1973 | /* We are about to wait on a pthread condition */ |
1974 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
1975 | ||
ee0b0061 | 1976 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
1977 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
1978 | /* | |
1979 | * Set the timeout for the condition timed wait even if the clock gettime | |
1980 | * call fails since we might loop on that call and we want to avoid to | |
1981 | * increment the timeout too many times. | |
1982 | */ | |
1983 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
1984 | ||
1985 | /* | |
1986 | * The following loop COULD be skipped in some conditions so this is why we | |
1987 | * set ret to 0 in order to make sure at least one round of the loop is | |
1988 | * done. | |
1989 | */ | |
1990 | ret = 0; | |
1991 | ||
1992 | /* | |
1993 | * Loop until the condition is reached or when a timeout is reached. Note | |
1994 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
1995 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
1996 | * possible. This loop does not take any chances and works with both of | |
1997 | * them. | |
1998 | */ | |
1999 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
2000 | if (clock_ret < 0) { | |
2001 | PERROR("clock_gettime spawn consumer"); | |
2002 | /* Infinite wait for the consumerd thread to be ready */ | |
2003 | ret = pthread_cond_wait(&consumer_data->cond, | |
2004 | &consumer_data->cond_mutex); | |
2005 | } else { | |
2006 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
2007 | &consumer_data->cond_mutex, &timeout); | |
2008 | } | |
ee0b0061 | 2009 | } |
8c0faa1d | 2010 | |
a23ec3a7 DG |
2011 | /* Release the pthread condition */ |
2012 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
2013 | ||
2014 | if (ret != 0) { | |
2015 | errno = ret; | |
2016 | if (ret == ETIMEDOUT) { | |
92d28f51 DG |
2017 | int pth_ret; |
2018 | ||
ee0b0061 DG |
2019 | /* |
2020 | * Call has timed out so we kill the kconsumerd_thread and return | |
2021 | * an error. | |
2022 | */ | |
a23ec3a7 DG |
2023 | ERR("Condition timed out. The consumer thread was never ready." |
2024 | " Killing it"); | |
92d28f51 DG |
2025 | pth_ret = pthread_cancel(consumer_data->thread); |
2026 | if (pth_ret < 0) { | |
3bd1e081 | 2027 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
2028 | } |
2029 | } else { | |
a23ec3a7 | 2030 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 | 2031 | } |
92d28f51 DG |
2032 | /* Caller is expecting a negative value on failure. */ |
2033 | ret = -1; | |
ee0b0061 DG |
2034 | goto error; |
2035 | } | |
2036 | ||
3bd1e081 MD |
2037 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2038 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2039 | ERR("Consumerd did not start"); |
3bd1e081 | 2040 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2041 | goto error; |
2042 | } | |
3bd1e081 | 2043 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2044 | |
8c0faa1d DG |
2045 | return 0; |
2046 | ||
2047 | error: | |
2048 | return ret; | |
2049 | } | |
2050 | ||
d9800920 | 2051 | /* |
3bd1e081 | 2052 | * Join consumer thread |
d9800920 | 2053 | */ |
3bd1e081 | 2054 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2055 | { |
2056 | void *status; | |
cf3af59e | 2057 | |
e8209f6b DG |
2058 | /* Consumer pid must be a real one. */ |
2059 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2060 | int ret; |
3bd1e081 | 2061 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2062 | if (ret) { |
3bd1e081 | 2063 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
2064 | return ret; |
2065 | } | |
3bd1e081 | 2066 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2067 | } else { |
2068 | return 0; | |
2069 | } | |
2070 | } | |
2071 | ||
8c0faa1d | 2072 | /* |
3bd1e081 | 2073 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2074 | * |
d063d709 | 2075 | * Return pid if successful else -1. |
8c0faa1d | 2076 | */ |
3bd1e081 | 2077 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2078 | { |
2079 | int ret; | |
2080 | pid_t pid; | |
94c55f17 | 2081 | const char *consumer_to_use; |
53086306 | 2082 | const char *verbosity; |
94c55f17 | 2083 | struct stat st; |
8c0faa1d | 2084 | |
3bd1e081 | 2085 | DBG("Spawning consumerd"); |
c49dc785 | 2086 | |
8c0faa1d DG |
2087 | pid = fork(); |
2088 | if (pid == 0) { | |
2089 | /* | |
3bd1e081 | 2090 | * Exec consumerd. |
8c0faa1d | 2091 | */ |
daee5345 | 2092 | if (opt_verbose_consumer) { |
53086306 DG |
2093 | verbosity = "--verbose"; |
2094 | } else { | |
2095 | verbosity = "--quiet"; | |
2096 | } | |
3bd1e081 MD |
2097 | switch (consumer_data->type) { |
2098 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2099 | /* |
c7704d57 DG |
2100 | * Find out which consumerd to execute. We will first try the |
2101 | * 64-bit path, then the sessiond's installation directory, and | |
2102 | * fallback on the 32-bit one, | |
94c55f17 | 2103 | */ |
63a799e8 AM |
2104 | DBG3("Looking for a kernel consumer at these locations:"); |
2105 | DBG3(" 1) %s", consumerd64_bin); | |
2106 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
2107 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 2108 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 2109 | DBG3("Found location #1"); |
94c55f17 | 2110 | consumer_to_use = consumerd64_bin; |
94c55f17 | 2111 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 2112 | DBG3("Found location #2"); |
94c55f17 | 2113 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 2114 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 2115 | DBG3("Found location #3"); |
eb1e0bd4 | 2116 | consumer_to_use = consumerd32_bin; |
94c55f17 | 2117 | } else { |
63a799e8 | 2118 | DBG("Could not find any valid consumerd executable"); |
92d28f51 | 2119 | ret = -EINVAL; |
94c55f17 AM |
2120 | break; |
2121 | } | |
2122 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
92d28f51 | 2123 | ret = execl(consumer_to_use, |
94c55f17 AM |
2124 | "lttng-consumerd", verbosity, "-k", |
2125 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2126 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2127 | NULL); | |
3bd1e081 | 2128 | break; |
7753dea8 MD |
2129 | case LTTNG_CONSUMER64_UST: |
2130 | { | |
b1e0b6b6 | 2131 | char *tmpnew = NULL; |
8f4905da MD |
2132 | |
2133 | if (consumerd64_libdir[0] != '\0') { | |
2134 | char *tmp; | |
2135 | size_t tmplen; | |
2136 | ||
2137 | tmp = getenv("LD_LIBRARY_PATH"); | |
2138 | if (!tmp) { | |
2139 | tmp = ""; | |
2140 | } | |
2141 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2142 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
2143 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2144 | if (!tmpnew) { | |
2145 | ret = -ENOMEM; | |
2146 | goto error; | |
2147 | } | |
2148 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2149 | strcat(tmpnew, consumerd64_libdir); | |
2150 | if (tmp[0] != '\0') { | |
2151 | strcat(tmpnew, ":"); | |
2152 | strcat(tmpnew, tmp); | |
2153 | } | |
2154 | ret = putenv(tmpnew); | |
2155 | if (ret) { | |
2156 | ret = -errno; | |
c6f76da9 | 2157 | free(tmpnew); |
8f4905da MD |
2158 | goto error; |
2159 | } | |
2160 | } | |
94c55f17 | 2161 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 2162 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2163 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2164 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2165 | NULL); | |
8f4905da MD |
2166 | if (consumerd64_libdir[0] != '\0') { |
2167 | free(tmpnew); | |
2168 | } | |
3bd1e081 | 2169 | break; |
7753dea8 MD |
2170 | } |
2171 | case LTTNG_CONSUMER32_UST: | |
2172 | { | |
937dde8e | 2173 | char *tmpnew = NULL; |
8f4905da MD |
2174 | |
2175 | if (consumerd32_libdir[0] != '\0') { | |
2176 | char *tmp; | |
2177 | size_t tmplen; | |
2178 | ||
2179 | tmp = getenv("LD_LIBRARY_PATH"); | |
2180 | if (!tmp) { | |
2181 | tmp = ""; | |
2182 | } | |
2183 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2184 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
2185 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2186 | if (!tmpnew) { | |
2187 | ret = -ENOMEM; | |
2188 | goto error; | |
2189 | } | |
2190 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2191 | strcat(tmpnew, consumerd32_libdir); | |
2192 | if (tmp[0] != '\0') { | |
2193 | strcat(tmpnew, ":"); | |
2194 | strcat(tmpnew, tmp); | |
2195 | } | |
2196 | ret = putenv(tmpnew); | |
2197 | if (ret) { | |
2198 | ret = -errno; | |
c6f76da9 | 2199 | free(tmpnew); |
8f4905da MD |
2200 | goto error; |
2201 | } | |
2202 | } | |
94c55f17 | 2203 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 2204 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2205 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2206 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2207 | NULL); | |
8f4905da MD |
2208 | if (consumerd32_libdir[0] != '\0') { |
2209 | free(tmpnew); | |
2210 | } | |
7753dea8 MD |
2211 | break; |
2212 | } | |
3bd1e081 | 2213 | default: |
76d7553f | 2214 | PERROR("unknown consumer type"); |
3bd1e081 MD |
2215 | exit(EXIT_FAILURE); |
2216 | } | |
8c0faa1d | 2217 | if (errno != 0) { |
92d28f51 | 2218 | PERROR("Consumer execl()"); |
8c0faa1d | 2219 | } |
92d28f51 | 2220 | /* Reaching this point, we got a failure on our execl(). */ |
8c0faa1d DG |
2221 | exit(EXIT_FAILURE); |
2222 | } else if (pid > 0) { | |
2223 | ret = pid; | |
8c0faa1d | 2224 | } else { |
76d7553f | 2225 | PERROR("start consumer fork"); |
8c0faa1d | 2226 | ret = -errno; |
8c0faa1d | 2227 | } |
8f4905da | 2228 | error: |
8c0faa1d DG |
2229 | return ret; |
2230 | } | |
2231 | ||
693bd40b | 2232 | /* |
3bd1e081 | 2233 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2234 | */ |
3bd1e081 | 2235 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2236 | { |
c617c0c6 | 2237 | int ret; |
edb8b045 DG |
2238 | |
2239 | /* | |
2240 | * Set the listen() state on the socket since there is a possible race | |
2241 | * between the exec() of the consumer daemon and this call if place in the | |
2242 | * consumer thread. See bug #366 for more details. | |
2243 | */ | |
2244 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2245 | if (ret < 0) { | |
2246 | goto error; | |
2247 | } | |
693bd40b | 2248 | |
3bd1e081 MD |
2249 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2250 | if (consumer_data->pid != 0) { | |
2251 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2252 | goto end; |
2253 | } | |
693bd40b | 2254 | |
3bd1e081 | 2255 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2256 | if (ret < 0) { |
3bd1e081 MD |
2257 | ERR("Spawning consumerd failed"); |
2258 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2259 | goto error; |
693bd40b | 2260 | } |
c49dc785 | 2261 | |
3bd1e081 MD |
2262 | /* Setting up the consumer_data pid */ |
2263 | consumer_data->pid = ret; | |
48842b30 | 2264 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2265 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2266 | |
3bd1e081 MD |
2267 | DBG2("Spawning consumer control thread"); |
2268 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2269 | if (ret < 0) { |
3bd1e081 | 2270 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2271 | goto error; |
2272 | } | |
2273 | ||
c49dc785 | 2274 | end: |
693bd40b DG |
2275 | return 0; |
2276 | ||
2277 | error: | |
331744e3 | 2278 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2279 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2280 | int err; |
2281 | ||
edb8b045 DG |
2282 | err = close(consumer_data->err_sock); |
2283 | if (err < 0) { | |
2284 | PERROR("close consumer data error socket"); | |
2285 | } | |
2286 | } | |
693bd40b DG |
2287 | return ret; |
2288 | } | |
2289 | ||
44a5e5eb | 2290 | /* |
139ac872 MD |
2291 | * Compute health status of each consumer. If one of them is zero (bad |
2292 | * state), we return 0. | |
44a5e5eb DG |
2293 | */ |
2294 | static int check_consumer_health(void) | |
2295 | { | |
2296 | int ret; | |
2297 | ||
927ca06a | 2298 | ret = health_check_state(HEALTH_TYPE_CONSUMER); |
44a5e5eb DG |
2299 | |
2300 | DBG3("Health consumer check %d", ret); | |
2301 | ||
2302 | return ret; | |
2303 | } | |
2304 | ||
b73401da | 2305 | /* |
096102bd | 2306 | * Setup necessary data for kernel tracer action. |
b73401da | 2307 | */ |
096102bd | 2308 | static int init_kernel_tracer(void) |
b73401da DG |
2309 | { |
2310 | int ret; | |
b73401da | 2311 | |
096102bd DG |
2312 | /* Modprobe lttng kernel modules */ |
2313 | ret = modprobe_lttng_control(); | |
b73401da | 2314 | if (ret < 0) { |
b73401da DG |
2315 | goto error; |
2316 | } | |
2317 | ||
096102bd DG |
2318 | /* Open debugfs lttng */ |
2319 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2320 | if (kernel_tracer_fd < 0) { | |
2321 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
2322 | ret = -1; |
2323 | goto error_open; | |
54d01ffb DG |
2324 | } |
2325 | ||
2f77fc4b DG |
2326 | /* Validate kernel version */ |
2327 | ret = kernel_validate_version(kernel_tracer_fd); | |
2328 | if (ret < 0) { | |
2329 | goto error_version; | |
b551a063 | 2330 | } |
54d01ffb | 2331 | |
2f77fc4b DG |
2332 | ret = modprobe_lttng_data(); |
2333 | if (ret < 0) { | |
2334 | goto error_modules; | |
54d01ffb DG |
2335 | } |
2336 | ||
2f77fc4b DG |
2337 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2338 | return 0; | |
2339 | ||
2340 | error_version: | |
2341 | modprobe_remove_lttng_control(); | |
2342 | ret = close(kernel_tracer_fd); | |
2343 | if (ret) { | |
2344 | PERROR("close"); | |
b551a063 | 2345 | } |
2f77fc4b | 2346 | kernel_tracer_fd = -1; |
f73fabfd | 2347 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2348 | |
2f77fc4b DG |
2349 | error_modules: |
2350 | ret = close(kernel_tracer_fd); | |
2351 | if (ret) { | |
2352 | PERROR("close"); | |
b551a063 | 2353 | } |
54d01ffb | 2354 | |
2f77fc4b DG |
2355 | error_open: |
2356 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2357 | |
2358 | error: | |
2f77fc4b DG |
2359 | WARN("No kernel tracer available"); |
2360 | kernel_tracer_fd = -1; | |
2361 | if (!is_root) { | |
f73fabfd | 2362 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2363 | } else { |
f73fabfd | 2364 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2365 | } |
54d01ffb DG |
2366 | } |
2367 | ||
2f77fc4b | 2368 | |
54d01ffb | 2369 | /* |
2f77fc4b DG |
2370 | * Copy consumer output from the tracing session to the domain session. The |
2371 | * function also applies the right modification on a per domain basis for the | |
2372 | * trace files destination directory. | |
36b588ed MD |
2373 | * |
2374 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2375 | */ |
2f77fc4b | 2376 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2377 | { |
2378 | int ret; | |
2f77fc4b DG |
2379 | const char *dir_name; |
2380 | struct consumer_output *consumer; | |
2381 | ||
2382 | assert(session); | |
2383 | assert(session->consumer); | |
54d01ffb | 2384 | |
b551a063 DG |
2385 | switch (domain) { |
2386 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2387 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2388 | /* |
2389 | * XXX: We should audit the session creation and what this function | |
2390 | * does "extra" in order to avoid a destroy since this function is used | |
2391 | * in the domain session creation (kernel and ust) only. Same for UST | |
2392 | * domain. | |
2393 | */ | |
2394 | if (session->kernel_session->consumer) { | |
2395 | consumer_destroy_output(session->kernel_session->consumer); | |
2396 | } | |
2f77fc4b DG |
2397 | session->kernel_session->consumer = |
2398 | consumer_copy_output(session->consumer); | |
2399 | /* Ease our life a bit for the next part */ | |
2400 | consumer = session->kernel_session->consumer; | |
2401 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 DG |
2402 | break; |
2403 | case LTTNG_DOMAIN_UST: | |
2f77fc4b | 2404 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2405 | if (session->ust_session->consumer) { |
2406 | consumer_destroy_output(session->ust_session->consumer); | |
2407 | } | |
2f77fc4b DG |
2408 | session->ust_session->consumer = |
2409 | consumer_copy_output(session->consumer); | |
2410 | /* Ease our life a bit for the next part */ | |
2411 | consumer = session->ust_session->consumer; | |
2412 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2413 | break; |
2414 | default: | |
f73fabfd | 2415 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2416 | goto error; |
2417 | } | |
2418 | ||
2f77fc4b | 2419 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2420 | strncat(consumer->subdir, dir_name, |
2421 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2422 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2423 | ||
f73fabfd | 2424 | ret = LTTNG_OK; |
54d01ffb DG |
2425 | |
2426 | error: | |
2427 | return ret; | |
2428 | } | |
2429 | ||
00e2e675 | 2430 | /* |
2f77fc4b | 2431 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2432 | * |
2433 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2434 | */ |
2f77fc4b DG |
2435 | static int create_ust_session(struct ltt_session *session, |
2436 | struct lttng_domain *domain) | |
00e2e675 DG |
2437 | { |
2438 | int ret; | |
2f77fc4b | 2439 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2440 | |
a4b92340 | 2441 | assert(session); |
2f77fc4b DG |
2442 | assert(domain); |
2443 | assert(session->consumer); | |
a4b92340 | 2444 | |
2f77fc4b DG |
2445 | switch (domain->type) { |
2446 | case LTTNG_DOMAIN_UST: | |
2447 | break; | |
2448 | default: | |
2449 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2450 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2451 | goto error; |
2452 | } | |
2453 | ||
2f77fc4b DG |
2454 | DBG("Creating UST session"); |
2455 | ||
dec56f6c | 2456 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2457 | if (lus == NULL) { |
f73fabfd | 2458 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2459 | goto error; |
2460 | } | |
2461 | ||
2f77fc4b DG |
2462 | lus->uid = session->uid; |
2463 | lus->gid = session->gid; | |
2bba9e53 | 2464 | lus->output_traces = session->output_traces; |
27babd3a | 2465 | lus->snapshot_mode = session->snapshot_mode; |
2f77fc4b | 2466 | session->ust_session = lus; |
00e2e675 | 2467 | |
2f77fc4b DG |
2468 | /* Copy session output to the newly created UST session */ |
2469 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2470 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2471 | goto error; |
2472 | } | |
2473 | ||
f73fabfd | 2474 | return LTTNG_OK; |
00e2e675 DG |
2475 | |
2476 | error: | |
2f77fc4b DG |
2477 | free(lus); |
2478 | session->ust_session = NULL; | |
00e2e675 DG |
2479 | return ret; |
2480 | } | |
2481 | ||
2482 | /* | |
2f77fc4b | 2483 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2484 | */ |
2f77fc4b | 2485 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2486 | { |
2487 | int ret; | |
a4b92340 | 2488 | |
2f77fc4b | 2489 | DBG("Creating kernel session"); |
00e2e675 | 2490 | |
2f77fc4b DG |
2491 | ret = kernel_create_session(session, kernel_tracer_fd); |
2492 | if (ret < 0) { | |
f73fabfd | 2493 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2494 | goto error; |
2495 | } | |
2496 | ||
2f77fc4b DG |
2497 | /* Code flow safety */ |
2498 | assert(session->kernel_session); | |
2499 | ||
2500 | /* Copy session output to the newly created Kernel session */ | |
2501 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2502 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2503 | goto error; |
2504 | } | |
2505 | ||
2f77fc4b DG |
2506 | /* Create directory(ies) on local filesystem. */ |
2507 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2508 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2509 | ret = run_as_mkdir_recursive( | |
2510 | session->kernel_session->consumer->dst.trace_path, | |
2511 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2512 | if (ret < 0) { | |
2513 | if (ret != -EEXIST) { | |
2514 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2515 | goto error; |
2516 | } | |
00e2e675 | 2517 | } |
2f77fc4b | 2518 | } |
00e2e675 | 2519 | |
2f77fc4b DG |
2520 | session->kernel_session->uid = session->uid; |
2521 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2522 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2523 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2524 | |
f73fabfd | 2525 | return LTTNG_OK; |
00e2e675 | 2526 | |
2f77fc4b DG |
2527 | error: |
2528 | trace_kernel_destroy_session(session->kernel_session); | |
2529 | session->kernel_session = NULL; | |
2530 | return ret; | |
2531 | } | |
00e2e675 | 2532 | |
2f77fc4b DG |
2533 | /* |
2534 | * Count number of session permitted by uid/gid. | |
2535 | */ | |
2536 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2537 | { | |
2538 | unsigned int i = 0; | |
2539 | struct ltt_session *session; | |
07424f16 | 2540 | |
2f77fc4b DG |
2541 | DBG("Counting number of available session for UID %d GID %d", |
2542 | uid, gid); | |
2543 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2544 | /* |
2f77fc4b | 2545 | * Only list the sessions the user can control. |
00e2e675 | 2546 | */ |
2f77fc4b DG |
2547 | if (!session_access_ok(session, uid, gid)) { |
2548 | continue; | |
2549 | } | |
2550 | i++; | |
a4b92340 | 2551 | } |
2f77fc4b | 2552 | return i; |
00e2e675 DG |
2553 | } |
2554 | ||
54d01ffb DG |
2555 | /* |
2556 | * Process the command requested by the lttng client within the command | |
2557 | * context structure. This function make sure that the return structure (llm) | |
2558 | * is set and ready for transmission before returning. | |
2559 | * | |
2560 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2561 | * |
2562 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
2563 | * |
2564 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2565 | */ |
53a80697 MD |
2566 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2567 | int *sock_error) | |
54d01ffb | 2568 | { |
f73fabfd | 2569 | int ret = LTTNG_OK; |
44d3bd01 | 2570 | int need_tracing_session = 1; |
2e09ba09 | 2571 | int need_domain; |
54d01ffb DG |
2572 | |
2573 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2574 | ||
53a80697 MD |
2575 | *sock_error = 0; |
2576 | ||
2e09ba09 MD |
2577 | switch (cmd_ctx->lsm->cmd_type) { |
2578 | case LTTNG_CREATE_SESSION: | |
27babd3a | 2579 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
2e09ba09 MD |
2580 | case LTTNG_DESTROY_SESSION: |
2581 | case LTTNG_LIST_SESSIONS: | |
2582 | case LTTNG_LIST_DOMAINS: | |
2583 | case LTTNG_START_TRACE: | |
2584 | case LTTNG_STOP_TRACE: | |
6d805429 | 2585 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
2586 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
2587 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2588 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2589 | case LTTNG_SNAPSHOT_RECORD: | |
2e09ba09 | 2590 | need_domain = 0; |
3aace903 | 2591 | break; |
2e09ba09 MD |
2592 | default: |
2593 | need_domain = 1; | |
2594 | } | |
2595 | ||
2596 | if (opt_no_kernel && need_domain | |
2597 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2598 | if (!is_root) { |
f73fabfd | 2599 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2600 | } else { |
f73fabfd | 2601 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2602 | } |
4fba7219 DG |
2603 | goto error; |
2604 | } | |
2605 | ||
8d3113b2 DG |
2606 | /* Deny register consumer if we already have a spawned consumer. */ |
2607 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2608 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2609 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2610 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2611 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2612 | goto error; |
2613 | } | |
2614 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2615 | } | |
2616 | ||
54d01ffb DG |
2617 | /* |
2618 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2619 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2620 | * command. |
2621 | */ | |
2622 | switch(cmd_ctx->lsm->cmd_type) { | |
2623 | case LTTNG_LIST_SESSIONS: | |
2624 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2625 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2626 | case LTTNG_LIST_DOMAINS: |
2627 | case LTTNG_LIST_CHANNELS: | |
2628 | case LTTNG_LIST_EVENTS: | |
2629 | break; | |
2630 | default: | |
2631 | /* Setup lttng message with no payload */ | |
2632 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2633 | if (ret < 0) { | |
2634 | /* This label does not try to unlock the session */ | |
2635 | goto init_setup_error; | |
2636 | } | |
2637 | } | |
2638 | ||
2639 | /* Commands that DO NOT need a session. */ | |
2640 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2641 | case LTTNG_CREATE_SESSION: |
27babd3a | 2642 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
2e09ba09 | 2643 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2644 | case LTTNG_LIST_SESSIONS: |
2645 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2646 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2647 | need_tracing_session = 0; |
54d01ffb DG |
2648 | break; |
2649 | default: | |
2650 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2651 | /* |
2652 | * We keep the session list lock across _all_ commands | |
2653 | * for now, because the per-session lock does not | |
2654 | * handle teardown properly. | |
2655 | */ | |
74babd95 | 2656 | session_lock_list(); |
54d01ffb DG |
2657 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2658 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 2659 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2660 | goto error; |
2661 | } else { | |
2662 | /* Acquire lock for the session */ | |
2663 | session_lock(cmd_ctx->session); | |
2664 | } | |
2665 | break; | |
2666 | } | |
b389abbe | 2667 | |
2e09ba09 MD |
2668 | if (!need_domain) { |
2669 | goto skip_domain; | |
2670 | } | |
a4b92340 | 2671 | |
54d01ffb DG |
2672 | /* |
2673 | * Check domain type for specific "pre-action". | |
2674 | */ | |
2675 | switch (cmd_ctx->lsm->domain.type) { | |
2676 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2677 | if (!is_root) { |
f73fabfd | 2678 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2679 | goto error; |
2680 | } | |
2681 | ||
54d01ffb | 2682 | /* Kernel tracer check */ |
a4b35e07 | 2683 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2684 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2685 | ret = init_kernel_tracer(); |
2686 | if (ret != 0) { | |
54d01ffb DG |
2687 | goto error; |
2688 | } | |
2689 | } | |
5eb91c98 | 2690 | |
5c827ce0 DG |
2691 | /* Consumer is in an ERROR state. Report back to client */ |
2692 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2693 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2694 | goto error; |
2695 | } | |
2696 | ||
54d01ffb | 2697 | /* Need a session for kernel command */ |
44d3bd01 | 2698 | if (need_tracing_session) { |
54d01ffb | 2699 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2700 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2701 | if (ret < 0) { |
f73fabfd | 2702 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2703 | goto error; |
2704 | } | |
b389abbe | 2705 | } |
7d29a247 | 2706 | |
54d01ffb | 2707 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2708 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2709 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 2710 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
2711 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2712 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2713 | if (ret < 0) { |
f73fabfd | 2714 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2715 | goto error; |
950131af | 2716 | } |
5c827ce0 | 2717 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2718 | } else { |
2719 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2720 | } |
173af62f | 2721 | |
a4b92340 DG |
2722 | /* |
2723 | * The consumer was just spawned so we need to add the socket to | |
2724 | * the consumer output of the session if exist. | |
2725 | */ | |
2726 | ret = consumer_create_socket(&kconsumer_data, | |
2727 | cmd_ctx->session->kernel_session->consumer); | |
2728 | if (ret < 0) { | |
2729 | goto error; | |
173af62f | 2730 | } |
0d0c377a | 2731 | } |
5c827ce0 | 2732 | |
54d01ffb | 2733 | break; |
2bdd86d4 | 2734 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2735 | { |
b51ec5b4 MD |
2736 | if (!ust_app_supported()) { |
2737 | ret = LTTNG_ERR_NO_UST; | |
2738 | goto error; | |
2739 | } | |
5c827ce0 DG |
2740 | /* Consumer is in an ERROR state. Report back to client */ |
2741 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2742 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2743 | goto error; |
2744 | } | |
2745 | ||
44d3bd01 | 2746 | if (need_tracing_session) { |
a4b92340 | 2747 | /* Create UST session if none exist. */ |
f6a9efaa | 2748 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2749 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2750 | &cmd_ctx->lsm->domain); |
f73fabfd | 2751 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2752 | goto error; |
2753 | } | |
2754 | } | |
00e2e675 | 2755 | |
7753dea8 MD |
2756 | /* Start the UST consumer daemons */ |
2757 | /* 64-bit */ | |
2758 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2759 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2760 | ustconsumer64_data.pid == 0 && |
785d2d0d | 2761 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2762 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2763 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2764 | if (ret < 0) { |
f73fabfd | 2765 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2766 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2767 | goto error; |
2768 | } | |
48842b30 | 2769 | |
173af62f | 2770 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2771 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2772 | } else { |
7753dea8 MD |
2773 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2774 | } | |
173af62f DG |
2775 | |
2776 | /* | |
2777 | * Setup socket for consumer 64 bit. No need for atomic access | |
2778 | * since it was set above and can ONLY be set in this thread. | |
2779 | */ | |
a4b92340 DG |
2780 | ret = consumer_create_socket(&ustconsumer64_data, |
2781 | cmd_ctx->session->ust_session->consumer); | |
2782 | if (ret < 0) { | |
2783 | goto error; | |
173af62f DG |
2784 | } |
2785 | ||
7753dea8 | 2786 | /* 32-bit */ |
fc7a59ce | 2787 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2788 | ustconsumer32_data.pid == 0 && |
785d2d0d | 2789 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2790 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2791 | ret = start_consumerd(&ustconsumer32_data); | |
2792 | if (ret < 0) { | |
f73fabfd | 2793 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2794 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2795 | goto error; |
2796 | } | |
5c827ce0 | 2797 | |
173af62f | 2798 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2799 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2800 | } else { |
2801 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2802 | } |
173af62f DG |
2803 | |
2804 | /* | |
2805 | * Setup socket for consumer 64 bit. No need for atomic access | |
2806 | * since it was set above and can ONLY be set in this thread. | |
2807 | */ | |
a4b92340 DG |
2808 | ret = consumer_create_socket(&ustconsumer32_data, |
2809 | cmd_ctx->session->ust_session->consumer); | |
2810 | if (ret < 0) { | |
2811 | goto error; | |
173af62f | 2812 | } |
44d3bd01 DG |
2813 | } |
2814 | break; | |
48842b30 | 2815 | } |
54d01ffb | 2816 | default: |
54d01ffb DG |
2817 | break; |
2818 | } | |
2e09ba09 | 2819 | skip_domain: |
33a2b854 | 2820 | |
5c827ce0 DG |
2821 | /* Validate consumer daemon state when start/stop trace command */ |
2822 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2823 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2824 | switch (cmd_ctx->lsm->domain.type) { | |
2825 | case LTTNG_DOMAIN_UST: | |
2826 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2827 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2828 | goto error; |
2829 | } | |
2830 | break; | |
2831 | case LTTNG_DOMAIN_KERNEL: | |
2832 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2833 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2834 | goto error; |
2835 | } | |
2836 | break; | |
2837 | } | |
2838 | } | |
2839 | ||
8e0af1b4 MD |
2840 | /* |
2841 | * Check that the UID or GID match that of the tracing session. | |
2842 | * The root user can interact with all sessions. | |
2843 | */ | |
2844 | if (need_tracing_session) { | |
2845 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2846 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2847 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2848 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2849 | goto error; |
2850 | } | |
2851 | } | |
2852 | ||
ffe60014 DG |
2853 | /* |
2854 | * Send relayd information to consumer as soon as we have a domain and a | |
2855 | * session defined. | |
2856 | */ | |
2857 | if (cmd_ctx->session && need_domain) { | |
2858 | /* | |
2859 | * Setup relayd if not done yet. If the relayd information was already | |
2860 | * sent to the consumer, this call will gracefully return. | |
2861 | */ | |
2862 | ret = cmd_setup_relayd(cmd_ctx->session); | |
2863 | if (ret != LTTNG_OK) { | |
2864 | goto error; | |
2865 | } | |
2866 | } | |
2867 | ||
54d01ffb DG |
2868 | /* Process by command type */ |
2869 | switch (cmd_ctx->lsm->cmd_type) { | |
2870 | case LTTNG_ADD_CONTEXT: | |
2871 | { | |
2872 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2873 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 2874 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
2875 | break; |
2876 | } | |
2877 | case LTTNG_DISABLE_CHANNEL: | |
2878 | { | |
2879 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2880 | cmd_ctx->lsm->u.disable.channel_name); | |
2881 | break; | |
2882 | } | |
2883 | case LTTNG_DISABLE_EVENT: | |
2884 | { | |
2885 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2886 | cmd_ctx->lsm->u.disable.channel_name, | |
2887 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2888 | break; |
2889 | } | |
54d01ffb DG |
2890 | case LTTNG_DISABLE_ALL_EVENT: |
2891 | { | |
2bdd86d4 | 2892 | DBG("Disabling all events"); |
54d01ffb DG |
2893 | |
2894 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2895 | cmd_ctx->lsm->u.disable.channel_name); | |
2896 | break; | |
2897 | } | |
2898 | case LTTNG_ENABLE_CHANNEL: | |
2899 | { | |
7972aab2 | 2900 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
2f77fc4b | 2901 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
2902 | break; |
2903 | } | |
2904 | case LTTNG_ENABLE_EVENT: | |
2905 | { | |
7972aab2 | 2906 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb | 2907 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2908 | &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2909 | break; |
2910 | } | |
2911 | case LTTNG_ENABLE_ALL_EVENT: | |
2912 | { | |
2bdd86d4 | 2913 | DBG("Enabling all events"); |
54d01ffb | 2914 | |
7972aab2 | 2915 | ret = cmd_enable_event_all(cmd_ctx->session, &cmd_ctx->lsm->domain, |
8c9ae521 | 2916 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2917 | cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2918 | break; |
2919 | } | |
052da939 | 2920 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2921 | { |
9f19cc17 | 2922 | struct lttng_event *events; |
54d01ffb | 2923 | ssize_t nb_events; |
052da939 | 2924 | |
ae7f78f3 | 2925 | session_lock_list(); |
54d01ffb | 2926 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
ae7f78f3 | 2927 | session_unlock_list(); |
54d01ffb | 2928 | if (nb_events < 0) { |
f73fabfd | 2929 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2930 | ret = -nb_events; |
2931 | goto error; | |
2ef84c95 DG |
2932 | } |
2933 | ||
2934 | /* | |
2935 | * Setup lttng message with payload size set to the event list size in | |
2936 | * bytes and then copy list into the llm payload. | |
2937 | */ | |
052da939 | 2938 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2939 | if (ret < 0) { |
052da939 | 2940 | free(events); |
2ef84c95 DG |
2941 | goto setup_error; |
2942 | } | |
2943 | ||
2944 | /* Copy event list into message payload */ | |
9f19cc17 | 2945 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2946 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2947 | |
9f19cc17 | 2948 | free(events); |
2ef84c95 | 2949 | |
f73fabfd | 2950 | ret = LTTNG_OK; |
2ef84c95 DG |
2951 | break; |
2952 | } | |
f37d259d MD |
2953 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
2954 | { | |
2955 | struct lttng_event_field *fields; | |
2956 | ssize_t nb_fields; | |
2957 | ||
ae7f78f3 | 2958 | session_lock_list(); |
a4b92340 DG |
2959 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
2960 | &fields); | |
ae7f78f3 | 2961 | session_unlock_list(); |
f37d259d | 2962 | if (nb_fields < 0) { |
f73fabfd | 2963 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
2964 | ret = -nb_fields; |
2965 | goto error; | |
2966 | } | |
2967 | ||
2968 | /* | |
2969 | * Setup lttng message with payload size set to the event list size in | |
2970 | * bytes and then copy list into the llm payload. | |
2971 | */ | |
a4b92340 DG |
2972 | ret = setup_lttng_msg(cmd_ctx, |
2973 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
2974 | if (ret < 0) { |
2975 | free(fields); | |
2976 | goto setup_error; | |
2977 | } | |
2978 | ||
2979 | /* Copy event list into message payload */ | |
2980 | memcpy(cmd_ctx->llm->payload, fields, | |
2981 | sizeof(struct lttng_event_field) * nb_fields); | |
2982 | ||
2983 | free(fields); | |
2984 | ||
f73fabfd | 2985 | ret = LTTNG_OK; |
f37d259d MD |
2986 | break; |
2987 | } | |
00e2e675 DG |
2988 | case LTTNG_SET_CONSUMER_URI: |
2989 | { | |
a4b92340 DG |
2990 | size_t nb_uri, len; |
2991 | struct lttng_uri *uris; | |
2992 | ||
2993 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2994 | len = nb_uri * sizeof(struct lttng_uri); | |
2995 | ||
2996 | if (nb_uri == 0) { | |
f73fabfd | 2997 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
2998 | goto error; |
2999 | } | |
3000 | ||
3001 | uris = zmalloc(len); | |
3002 | if (uris == NULL) { | |
f73fabfd | 3003 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3004 | goto error; |
3005 | } | |
3006 | ||
3007 | /* Receive variable len data */ | |
77c7c900 | 3008 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
3009 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3010 | if (ret <= 0) { | |
3011 | DBG("No URIs received from client... continuing"); | |
3012 | *sock_error = 1; | |
f73fabfd | 3013 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3014 | free(uris); |
a4b92340 DG |
3015 | goto error; |
3016 | } | |
3017 | ||
00e2e675 | 3018 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 3019 | nb_uri, uris); |
f73fabfd | 3020 | if (ret != LTTNG_OK) { |
b1d41407 | 3021 | free(uris); |
a4b92340 DG |
3022 | goto error; |
3023 | } | |
3024 | ||
3025 | /* | |
3026 | * XXX: 0 means that this URI should be applied on the session. Should | |
3027 | * be a DOMAIN enuam. | |
3028 | */ | |
3029 | if (cmd_ctx->lsm->domain.type == 0) { | |
3030 | /* Add the URI for the UST session if a consumer is present. */ | |
3031 | if (cmd_ctx->session->ust_session && | |
3032 | cmd_ctx->session->ust_session->consumer) { | |
3033 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
3034 | nb_uri, uris); | |
3035 | } else if (cmd_ctx->session->kernel_session && | |
3036 | cmd_ctx->session->kernel_session->consumer) { | |
3037 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
3038 | cmd_ctx->session, nb_uri, uris); | |
3039 | } | |
3040 | } | |
3041 | ||
b1d41407 DG |
3042 | free(uris); |
3043 | ||
00e2e675 DG |
3044 | break; |
3045 | } | |
f3ed775e | 3046 | case LTTNG_START_TRACE: |
8c0faa1d | 3047 | { |
54d01ffb | 3048 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3049 | break; |
3050 | } | |
f3ed775e | 3051 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3052 | { |
54d01ffb | 3053 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3054 | break; |
3055 | } | |
5e16da05 MD |
3056 | case LTTNG_CREATE_SESSION: |
3057 | { | |
a4b92340 DG |
3058 | size_t nb_uri, len; |
3059 | struct lttng_uri *uris = NULL; | |
3060 | ||
3061 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3062 | len = nb_uri * sizeof(struct lttng_uri); | |
3063 | ||
3064 | if (nb_uri > 0) { | |
3065 | uris = zmalloc(len); | |
3066 | if (uris == NULL) { | |
f73fabfd | 3067 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3068 | goto error; |
3069 | } | |
3070 | ||
3071 | /* Receive variable len data */ | |
77c7c900 | 3072 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3073 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3074 | if (ret <= 0) { | |
3075 | DBG("No URIs received from client... continuing"); | |
3076 | *sock_error = 1; | |
f73fabfd | 3077 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3078 | free(uris); |
a4b92340 DG |
3079 | goto error; |
3080 | } | |
3081 | ||
3082 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3083 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3084 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3085 | free(uris); |
a4b92340 DG |
3086 | goto error; |
3087 | } | |
3088 | } | |
3089 | ||
3090 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
3091 | &cmd_ctx->creds); | |
3092 | ||
b1d41407 DG |
3093 | free(uris); |
3094 | ||
00e2e675 DG |
3095 | break; |
3096 | } | |
5e16da05 MD |
3097 | case LTTNG_DESTROY_SESSION: |
3098 | { | |
2f77fc4b | 3099 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
3100 | |
3101 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 3102 | cmd_ctx->session = NULL; |
5461b305 | 3103 | break; |
5e16da05 | 3104 | } |
9f19cc17 | 3105 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3106 | { |
54d01ffb DG |
3107 | ssize_t nb_dom; |
3108 | struct lttng_domain *domains; | |
5461b305 | 3109 | |
54d01ffb DG |
3110 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3111 | if (nb_dom < 0) { | |
f73fabfd | 3112 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3113 | ret = -nb_dom; |
3114 | goto error; | |
ce3d728c | 3115 | } |
520ff687 | 3116 | |
54d01ffb | 3117 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 | 3118 | if (ret < 0) { |
ae9c20bc | 3119 | free(domains); |
5461b305 | 3120 | goto setup_error; |
520ff687 | 3121 | } |
57167058 | 3122 | |
54d01ffb DG |
3123 | /* Copy event list into message payload */ |
3124 | memcpy(cmd_ctx->llm->payload, domains, | |
3125 | nb_dom * sizeof(struct lttng_domain)); | |
3126 | ||
3127 | free(domains); | |
5e16da05 | 3128 | |
f73fabfd | 3129 | ret = LTTNG_OK; |
5e16da05 MD |
3130 | break; |
3131 | } | |
9f19cc17 | 3132 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3133 | { |
6775595e | 3134 | int nb_chan; |
54d01ffb DG |
3135 | struct lttng_channel *channels; |
3136 | ||
b551a063 DG |
3137 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3138 | cmd_ctx->session, &channels); | |
54d01ffb | 3139 | if (nb_chan < 0) { |
f73fabfd | 3140 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3141 | ret = -nb_chan; |
3142 | goto error; | |
5461b305 | 3143 | } |
ca95a216 | 3144 | |
54d01ffb | 3145 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 | 3146 | if (ret < 0) { |
ae9c20bc | 3147 | free(channels); |
5461b305 DG |
3148 | goto setup_error; |
3149 | } | |
9f19cc17 | 3150 | |
54d01ffb DG |
3151 | /* Copy event list into message payload */ |
3152 | memcpy(cmd_ctx->llm->payload, channels, | |
3153 | nb_chan * sizeof(struct lttng_channel)); | |
3154 | ||
3155 | free(channels); | |
9f19cc17 | 3156 | |
f73fabfd | 3157 | ret = LTTNG_OK; |
5461b305 | 3158 | break; |
5e16da05 | 3159 | } |
9f19cc17 | 3160 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3161 | { |
b551a063 | 3162 | ssize_t nb_event; |
684d34d2 | 3163 | struct lttng_event *events = NULL; |
9f19cc17 | 3164 | |
b551a063 | 3165 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3166 | cmd_ctx->lsm->u.list.channel_name, &events); |
3167 | if (nb_event < 0) { | |
f73fabfd | 3168 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3169 | ret = -nb_event; |
3170 | goto error; | |
5461b305 | 3171 | } |
ca95a216 | 3172 | |
54d01ffb | 3173 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 | 3174 | if (ret < 0) { |
ae9c20bc | 3175 | free(events); |
5461b305 DG |
3176 | goto setup_error; |
3177 | } | |
9f19cc17 | 3178 | |
54d01ffb DG |
3179 | /* Copy event list into message payload */ |
3180 | memcpy(cmd_ctx->llm->payload, events, | |
3181 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3182 | |
54d01ffb | 3183 | free(events); |
9f19cc17 | 3184 | |
f73fabfd | 3185 | ret = LTTNG_OK; |
5461b305 | 3186 | break; |
5e16da05 MD |
3187 | } |
3188 | case LTTNG_LIST_SESSIONS: | |
3189 | { | |
8e0af1b4 | 3190 | unsigned int nr_sessions; |
5461b305 | 3191 | |
8e0af1b4 | 3192 | session_lock_list(); |
730389d9 DG |
3193 | nr_sessions = lttng_sessions_count( |
3194 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3195 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3196 | |
8e0af1b4 | 3197 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3198 | if (ret < 0) { |
54d01ffb | 3199 | session_unlock_list(); |
5461b305 | 3200 | goto setup_error; |
e065084a | 3201 | } |
5e16da05 | 3202 | |
6c9cc2ab | 3203 | /* Filled the session array */ |
2f77fc4b | 3204 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3205 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3206 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3207 | |
54d01ffb | 3208 | session_unlock_list(); |
5e16da05 | 3209 | |
f73fabfd | 3210 | ret = LTTNG_OK; |
5e16da05 MD |
3211 | break; |
3212 | } | |
d0254c7c MD |
3213 | case LTTNG_CALIBRATE: |
3214 | { | |
54d01ffb DG |
3215 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3216 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3217 | break; |
3218 | } | |
d9800920 DG |
3219 | case LTTNG_REGISTER_CONSUMER: |
3220 | { | |
2f77fc4b DG |
3221 | struct consumer_data *cdata; |
3222 | ||
3223 | switch (cmd_ctx->lsm->domain.type) { | |
3224 | case LTTNG_DOMAIN_KERNEL: | |
3225 | cdata = &kconsumer_data; | |
3226 | break; | |
3227 | default: | |
f73fabfd | 3228 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3229 | goto error; |
3230 | } | |
3231 | ||
54d01ffb | 3232 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 3233 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
3234 | break; |
3235 | } | |
025faf73 | 3236 | case LTTNG_ENABLE_EVENT_WITH_FILTER: |
53a80697 MD |
3237 | { |
3238 | struct lttng_filter_bytecode *bytecode; | |
3239 | ||
025faf73 | 3240 | if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) { |
f73fabfd | 3241 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3242 | goto error; |
3243 | } | |
52df2401 MD |
3244 | if (cmd_ctx->lsm->u.enable.bytecode_len == 0) { |
3245 | ret = LTTNG_ERR_FILTER_INVAL; | |
3246 | goto error; | |
3247 | } | |
025faf73 | 3248 | bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 | 3249 | if (!bytecode) { |
f73fabfd | 3250 | ret = LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
3251 | goto error; |
3252 | } | |
3253 | /* Receive var. len. data */ | |
3254 | DBG("Receiving var len data from client ..."); | |
3255 | ret = lttcomm_recv_unix_sock(sock, bytecode, | |
025faf73 | 3256 | cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 MD |
3257 | if (ret <= 0) { |
3258 | DBG("Nothing recv() from client var len data... continuing"); | |
3259 | *sock_error = 1; | |
f73fabfd | 3260 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3261 | goto error; |
3262 | } | |
3263 | ||
3264 | if (bytecode->len + sizeof(*bytecode) | |
025faf73 | 3265 | != cmd_ctx->lsm->u.enable.bytecode_len) { |
53a80697 | 3266 | free(bytecode); |
f73fabfd | 3267 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3268 | goto error; |
3269 | } | |
3270 | ||
7972aab2 | 3271 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
025faf73 DG |
3272 | cmd_ctx->lsm->u.enable.channel_name, |
3273 | &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]); | |
53a80697 MD |
3274 | break; |
3275 | } | |
6d805429 | 3276 | case LTTNG_DATA_PENDING: |
806e2684 | 3277 | { |
6d805429 | 3278 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
3279 | break; |
3280 | } | |
da3c9ec1 DG |
3281 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3282 | { | |
6dc3064a DG |
3283 | struct lttcomm_lttng_output_id reply; |
3284 | ||
3285 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3286 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
3287 | if (ret != LTTNG_OK) { | |
3288 | goto error; | |
3289 | } | |
3290 | ||
3291 | ret = setup_lttng_msg(cmd_ctx, sizeof(reply)); | |
3292 | if (ret < 0) { | |
3293 | goto setup_error; | |
3294 | } | |
3295 | ||
3296 | /* Copy output list into message payload */ | |
3297 | memcpy(cmd_ctx->llm->payload, &reply, sizeof(reply)); | |
3298 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3299 | break; |
3300 | } | |
3301 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3302 | { | |
6dc3064a DG |
3303 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
3304 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
3305 | break; |
3306 | } | |
3307 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3308 | { | |
6dc3064a DG |
3309 | ssize_t nb_output; |
3310 | struct lttng_snapshot_output *outputs = NULL; | |
3311 | ||
3312 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
3313 | if (nb_output < 0) { | |
3314 | ret = -nb_output; | |
3315 | goto error; | |
3316 | } | |
3317 | ||
3318 | ret = setup_lttng_msg(cmd_ctx, | |
3319 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3320 | if (ret < 0) { | |
3321 | free(outputs); | |
3322 | goto setup_error; | |
3323 | } | |
3324 | ||
3325 | if (outputs) { | |
3326 | /* Copy output list into message payload */ | |
3327 | memcpy(cmd_ctx->llm->payload, outputs, | |
3328 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3329 | free(outputs); | |
3330 | } | |
3331 | ||
3332 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3333 | break; |
3334 | } | |
3335 | case LTTNG_SNAPSHOT_RECORD: | |
3336 | { | |
6dc3064a DG |
3337 | ret = cmd_snapshot_record(cmd_ctx->session, |
3338 | &cmd_ctx->lsm->u.snapshot_record.output, | |
3339 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
3340 | break; |
3341 | } | |
27babd3a DG |
3342 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
3343 | { | |
3344 | size_t nb_uri, len; | |
3345 | struct lttng_uri *uris = NULL; | |
3346 | ||
3347 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3348 | len = nb_uri * sizeof(struct lttng_uri); | |
3349 | ||
3350 | if (nb_uri > 0) { | |
3351 | uris = zmalloc(len); | |
3352 | if (uris == NULL) { | |
3353 | ret = LTTNG_ERR_FATAL; | |
3354 | goto error; | |
3355 | } | |
3356 | ||
3357 | /* Receive variable len data */ | |
3358 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3359 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3360 | if (ret <= 0) { | |
3361 | DBG("No URIs received from client... continuing"); | |
3362 | *sock_error = 1; | |
3363 | ret = LTTNG_ERR_SESSION_FAIL; | |
3364 | free(uris); | |
3365 | goto error; | |
3366 | } | |
3367 | ||
3368 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3369 | DBG("Creating session with ONE network URI is a bad call"); | |
3370 | ret = LTTNG_ERR_SESSION_FAIL; | |
3371 | free(uris); | |
3372 | goto error; | |
3373 | } | |
3374 | } | |
3375 | ||
3376 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
3377 | nb_uri, &cmd_ctx->creds); | |
3378 | free(uris); | |
3379 | break; | |
3380 | } | |
5e16da05 | 3381 | default: |
f73fabfd | 3382 | ret = LTTNG_ERR_UND; |
5461b305 | 3383 | break; |
fac6795d DG |
3384 | } |
3385 | ||
5461b305 | 3386 | error: |
5461b305 DG |
3387 | if (cmd_ctx->llm == NULL) { |
3388 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3389 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3390 | goto setup_error; |
3391 | } | |
3392 | } | |
54d01ffb | 3393 | /* Set return code */ |
5461b305 | 3394 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3395 | setup_error: |
b5541356 | 3396 | if (cmd_ctx->session) { |
54d01ffb | 3397 | session_unlock(cmd_ctx->session); |
b5541356 | 3398 | } |
256a5576 MD |
3399 | if (need_tracing_session) { |
3400 | session_unlock_list(); | |
3401 | } | |
54d01ffb | 3402 | init_setup_error: |
8028d920 | 3403 | return ret; |
fac6795d DG |
3404 | } |
3405 | ||
44a5e5eb DG |
3406 | /* |
3407 | * Thread managing health check socket. | |
3408 | */ | |
3409 | static void *thread_manage_health(void *data) | |
3410 | { | |
eb4a2943 | 3411 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
3412 | uint32_t revents, nb_fd; |
3413 | struct lttng_poll_event events; | |
3414 | struct lttcomm_health_msg msg; | |
3415 | struct lttcomm_health_data reply; | |
3416 | ||
3417 | DBG("[thread] Manage health check started"); | |
3418 | ||
3419 | rcu_register_thread(); | |
3420 | ||
6d737ce4 DG |
3421 | /* We might hit an error path before this is created. */ |
3422 | lttng_poll_init(&events); | |
3cc04881 | 3423 | |
44a5e5eb DG |
3424 | /* Create unix socket */ |
3425 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
3426 | if (sock < 0) { | |
3427 | ERR("Unable to create health check Unix socket"); | |
3428 | ret = -1; | |
3429 | goto error; | |
3430 | } | |
3431 | ||
b662582b DG |
3432 | /* |
3433 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3434 | * show must go on. | |
3435 | */ | |
3436 | (void) utils_set_fd_cloexec(sock); | |
3437 | ||
44a5e5eb DG |
3438 | ret = lttcomm_listen_unix_sock(sock); |
3439 | if (ret < 0) { | |
3440 | goto error; | |
3441 | } | |
3442 | ||
3443 | /* | |
3444 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3445 | * more will be added to this poll set. | |
3446 | */ | |
d0b96690 | 3447 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
3448 | if (ret < 0) { |
3449 | goto error; | |
3450 | } | |
3451 | ||
3452 | /* Add the application registration socket */ | |
3453 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
3454 | if (ret < 0) { | |
3455 | goto error; | |
3456 | } | |
3457 | ||
3458 | while (1) { | |
3459 | DBG("Health check ready"); | |
3460 | ||
44a5e5eb DG |
3461 | /* Inifinite blocking call, waiting for transmission */ |
3462 | restart: | |
3463 | ret = lttng_poll_wait(&events, -1); | |
3464 | if (ret < 0) { | |
3465 | /* | |
3466 | * Restart interrupted system call. | |
3467 | */ | |
3468 | if (errno == EINTR) { | |
3469 | goto restart; | |
3470 | } | |
3471 | goto error; | |
3472 | } | |
3473 | ||
0d9c5d77 DG |
3474 | nb_fd = ret; |
3475 | ||
44a5e5eb DG |
3476 | for (i = 0; i < nb_fd; i++) { |
3477 | /* Fetch once the poll data */ | |
3478 | revents = LTTNG_POLL_GETEV(&events, i); | |
3479 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3480 | ||
3481 | /* Thread quit pipe has been closed. Killing thread. */ | |
d0b96690 | 3482 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 3483 | if (ret) { |
139ac872 MD |
3484 | err = 0; |
3485 | goto exit; | |
44a5e5eb DG |
3486 | } |
3487 | ||
3488 | /* Event on the registration socket */ | |
3489 | if (pollfd == sock) { | |
3490 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3491 | ERR("Health socket poll error"); | |
3492 | goto error; | |
3493 | } | |
3494 | } | |
3495 | } | |
3496 | ||
3497 | new_sock = lttcomm_accept_unix_sock(sock); | |
3498 | if (new_sock < 0) { | |
3499 | goto error; | |
3500 | } | |
3501 | ||
b662582b DG |
3502 | /* |
3503 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3504 | * show must go on. | |
3505 | */ | |
3506 | (void) utils_set_fd_cloexec(new_sock); | |
3507 | ||
44a5e5eb DG |
3508 | DBG("Receiving data from client for health..."); |
3509 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
3510 | if (ret <= 0) { | |
3511 | DBG("Nothing recv() from client... continuing"); | |
3512 | ret = close(new_sock); | |
3513 | if (ret) { | |
3514 | PERROR("close"); | |
3515 | } | |
3516 | new_sock = -1; | |
3517 | continue; | |
3518 | } | |
3519 | ||
3520 | rcu_thread_online(); | |
3521 | ||
3522 | switch (msg.component) { | |
3523 | case LTTNG_HEALTH_CMD: | |
927ca06a | 3524 | reply.ret_code = health_check_state(HEALTH_TYPE_CMD); |
44a5e5eb | 3525 | break; |
139ac872 | 3526 | case LTTNG_HEALTH_APP_MANAGE: |
927ca06a | 3527 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE); |
139ac872 | 3528 | break; |
44a5e5eb | 3529 | case LTTNG_HEALTH_APP_REG: |
927ca06a | 3530 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG); |
44a5e5eb DG |
3531 | break; |
3532 | case LTTNG_HEALTH_KERNEL: | |
927ca06a | 3533 | reply.ret_code = health_check_state(HEALTH_TYPE_KERNEL); |
44a5e5eb DG |
3534 | break; |
3535 | case LTTNG_HEALTH_CONSUMER: | |
3536 | reply.ret_code = check_consumer_health(); | |
3537 | break; | |
0b2dc8df MD |
3538 | case LTTNG_HEALTH_HT_CLEANUP: |
3539 | reply.ret_code = health_check_state(HEALTH_TYPE_HT_CLEANUP); | |
3540 | break; | |
380e8d6f MD |
3541 | case LTTNG_HEALTH_APP_MANAGE_NOTIFY: |
3542 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY); | |
3543 | break; | |
12e2b881 MD |
3544 | case LTTNG_HEALTH_APP_REG_DISPATCH: |
3545 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG_DISPATCH); | |
3546 | break; | |
44a5e5eb | 3547 | case LTTNG_HEALTH_ALL: |
44a5e5eb | 3548 | reply.ret_code = |
927ca06a DG |
3549 | health_check_state(HEALTH_TYPE_APP_MANAGE) && |
3550 | health_check_state(HEALTH_TYPE_APP_REG) && | |
3551 | health_check_state(HEALTH_TYPE_CMD) && | |
3552 | health_check_state(HEALTH_TYPE_KERNEL) && | |
0b2dc8df | 3553 | check_consumer_health() && |
380e8d6f | 3554 | health_check_state(HEALTH_TYPE_HT_CLEANUP) && |
12e2b881 MD |
3555 | health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY) && |
3556 | health_check_state(HEALTH_TYPE_APP_REG_DISPATCH); | |
44a5e5eb DG |
3557 | break; |
3558 | default: | |
f73fabfd | 3559 | reply.ret_code = LTTNG_ERR_UND; |
44a5e5eb DG |
3560 | break; |
3561 | } | |
3562 | ||
3563 | /* | |
3564 | * Flip ret value since 0 is a success and 1 indicates a bad health for | |
3565 | * the client where in the sessiond it is the opposite. Again, this is | |
3566 | * just to make things easier for us poor developer which enjoy a lot | |
3567 | * lazyness. | |
3568 | */ | |
3569 | if (reply.ret_code == 0 || reply.ret_code == 1) { | |
3570 | reply.ret_code = !reply.ret_code; | |
3571 | } | |
3572 | ||
3573 | DBG2("Health check return value %d", reply.ret_code); | |
3574 | ||
3575 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
3576 | if (ret < 0) { | |
3577 | ERR("Failed to send health data back to client"); | |
3578 | } | |
3579 | ||
3580 | /* End of transmission */ | |
3581 | ret = close(new_sock); | |
3582 | if (ret) { | |
3583 | PERROR("close"); | |
3584 | } | |
3585 | new_sock = -1; | |
3586 | } | |
3587 | ||
139ac872 | 3588 | exit: |
44a5e5eb | 3589 | error: |
139ac872 MD |
3590 | if (err) { |
3591 | ERR("Health error occurred in %s", __func__); | |
3592 | } | |
44a5e5eb DG |
3593 | DBG("Health check thread dying"); |
3594 | unlink(health_unix_sock_path); | |
3595 | if (sock >= 0) { | |
3596 | ret = close(sock); | |
3597 | if (ret) { | |
3598 | PERROR("close"); | |
3599 | } | |
3600 | } | |
44a5e5eb DG |
3601 | |
3602 | lttng_poll_clean(&events); | |
3603 | ||
3604 | rcu_unregister_thread(); | |
3605 | return NULL; | |
3606 | } | |
3607 | ||
1d4b027a | 3608 | /* |
d063d709 DG |
3609 | * This thread manage all clients request using the unix client socket for |
3610 | * communication. | |
1d4b027a DG |
3611 | */ |
3612 | static void *thread_manage_clients(void *data) | |
3613 | { | |
139ac872 | 3614 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3615 | int sock_error; |
5eb91c98 | 3616 | uint32_t revents, nb_fd; |
273ea72c | 3617 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3618 | struct lttng_poll_event events; |
1d4b027a DG |
3619 | |
3620 | DBG("[thread] Manage client started"); | |
3621 | ||
f6a9efaa DG |
3622 | rcu_register_thread(); |
3623 | ||
927ca06a DG |
3624 | health_register(HEALTH_TYPE_CMD); |
3625 | ||
6993eeb3 CB |
3626 | if (testpoint(thread_manage_clients)) { |
3627 | goto error_testpoint; | |
3628 | } | |
3629 | ||
840cb59c | 3630 | health_code_update(); |
44a5e5eb | 3631 | |
1d4b027a DG |
3632 | ret = lttcomm_listen_unix_sock(client_sock); |
3633 | if (ret < 0) { | |
35df2755 | 3634 | goto error_listen; |
1d4b027a DG |
3635 | } |
3636 | ||
5eb91c98 DG |
3637 | /* |
3638 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3639 | * more will be added to this poll set. | |
3640 | */ | |
d0b96690 | 3641 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 3642 | if (ret < 0) { |
35df2755 | 3643 | goto error_create_poll; |
5eb91c98 | 3644 | } |
273ea72c | 3645 | |
5eb91c98 DG |
3646 | /* Add the application registration socket */ |
3647 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3648 | if (ret < 0) { | |
3649 | goto error; | |
3650 | } | |
273ea72c | 3651 | |
bbd973c2 DG |
3652 | /* |
3653 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3654 | */ |
3655 | if (opt_sig_parent) { | |
8db8d1dc | 3656 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3657 | } |
3658 | ||
6993eeb3 CB |
3659 | if (testpoint(thread_manage_clients_before_loop)) { |
3660 | goto error; | |
3661 | } | |
8ac94142 | 3662 | |
840cb59c | 3663 | health_code_update(); |
44a5e5eb | 3664 | |
1d4b027a | 3665 | while (1) { |
1d4b027a | 3666 | DBG("Accepting client command ..."); |
273ea72c DG |
3667 | |
3668 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 3669 | restart: |
a78af745 | 3670 | health_poll_entry(); |
5eb91c98 | 3671 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 3672 | health_poll_exit(); |
273ea72c | 3673 | if (ret < 0) { |
88f2b785 MD |
3674 | /* |
3675 | * Restart interrupted system call. | |
3676 | */ | |
3677 | if (errno == EINTR) { | |
3678 | goto restart; | |
3679 | } | |
273ea72c DG |
3680 | goto error; |
3681 | } | |
3682 | ||
0d9c5d77 DG |
3683 | nb_fd = ret; |
3684 | ||
5eb91c98 DG |
3685 | for (i = 0; i < nb_fd; i++) { |
3686 | /* Fetch once the poll data */ | |
3687 | revents = LTTNG_POLL_GETEV(&events, i); | |
3688 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3689 | ||
840cb59c | 3690 | health_code_update(); |
44a5e5eb | 3691 | |
5eb91c98 | 3692 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 3693 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 3694 | if (ret) { |
139ac872 MD |
3695 | err = 0; |
3696 | goto exit; | |
5eb91c98 DG |
3697 | } |
3698 | ||
3699 | /* Event on the registration socket */ | |
3700 | if (pollfd == client_sock) { | |
3701 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3702 | ERR("Client socket poll error"); | |
3703 | goto error; | |
3704 | } | |
3705 | } | |
3706 | } | |
3707 | ||
3708 | DBG("Wait for client response"); | |
3709 | ||
840cb59c | 3710 | health_code_update(); |
44a5e5eb | 3711 | |
5eb91c98 DG |
3712 | sock = lttcomm_accept_unix_sock(client_sock); |
3713 | if (sock < 0) { | |
273ea72c | 3714 | goto error; |
273ea72c DG |
3715 | } |
3716 | ||
b662582b DG |
3717 | /* |
3718 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3719 | * show must go on. | |
3720 | */ | |
3721 | (void) utils_set_fd_cloexec(sock); | |
3722 | ||
be040666 DG |
3723 | /* Set socket option for credentials retrieval */ |
3724 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3725 | if (ret < 0) { | |
3726 | goto error; | |
3727 | } | |
3728 | ||
5eb91c98 | 3729 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3730 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3731 | if (cmd_ctx == NULL) { |
76d7553f | 3732 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3733 | goto error; |
5eb91c98 | 3734 | } |
1d4b027a | 3735 | |
5eb91c98 | 3736 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3737 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3738 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3739 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3740 | goto error; |
3741 | } | |
1d4b027a | 3742 | |
5eb91c98 DG |
3743 | cmd_ctx->llm = NULL; |
3744 | cmd_ctx->session = NULL; | |
1d4b027a | 3745 | |
840cb59c | 3746 | health_code_update(); |
44a5e5eb | 3747 | |
5eb91c98 DG |
3748 | /* |
3749 | * Data is received from the lttng client. The struct | |
3750 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3751 | * the client. | |
3752 | */ | |
3753 | DBG("Receiving data from client ..."); | |
be040666 DG |
3754 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3755 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3756 | if (ret <= 0) { |
3757 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3758 | ret = close(sock); |
3759 | if (ret) { | |
3760 | PERROR("close"); | |
3761 | } | |
3762 | sock = -1; | |
a2c0da86 | 3763 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3764 | continue; |
3765 | } | |
1d4b027a | 3766 | |
840cb59c | 3767 | health_code_update(); |
44a5e5eb | 3768 | |
5eb91c98 DG |
3769 | // TODO: Validate cmd_ctx including sanity check for |
3770 | // security purpose. | |
f7776ea7 | 3771 | |
f6a9efaa | 3772 | rcu_thread_online(); |
5eb91c98 DG |
3773 | /* |
3774 | * This function dispatch the work to the kernel or userspace tracer | |
3775 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3776 | * informations for the client. The command context struct contains | |
3777 | * everything this function may needs. | |
3778 | */ | |
53a80697 | 3779 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3780 | rcu_thread_offline(); |
5eb91c98 | 3781 | if (ret < 0) { |
36134aa1 DG |
3782 | ret = close(sock); |
3783 | if (ret) { | |
3784 | PERROR("close"); | |
53a80697 | 3785 | } |
36134aa1 | 3786 | sock = -1; |
bbd973c2 | 3787 | /* |
5eb91c98 | 3788 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3789 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3790 | * (ENOMEM). Error detected but still accept |
3791 | * command, unless a socket error has been | |
3792 | * detected. | |
bbd973c2 | 3793 | */ |
bbd973c2 | 3794 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3795 | continue; |
3796 | } | |
d6e4fca4 | 3797 | |
840cb59c | 3798 | health_code_update(); |
44a5e5eb | 3799 | |
54d01ffb DG |
3800 | DBG("Sending response (size: %d, retcode: %s)", |
3801 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3802 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3803 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3804 | if (ret < 0) { |
3805 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3806 | } |
1d4b027a | 3807 | |
5eb91c98 | 3808 | /* End of transmission */ |
76d7553f MD |
3809 | ret = close(sock); |
3810 | if (ret) { | |
3811 | PERROR("close"); | |
3812 | } | |
3813 | sock = -1; | |
be040666 DG |
3814 | |
3815 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 3816 | |
840cb59c | 3817 | health_code_update(); |
273ea72c DG |
3818 | } |
3819 | ||
139ac872 | 3820 | exit: |
5eb91c98 | 3821 | error: |
35df2755 CB |
3822 | if (sock >= 0) { |
3823 | ret = close(sock); | |
3824 | if (ret) { | |
3825 | PERROR("close"); | |
3826 | } | |
139ac872 | 3827 | } |
44a5e5eb | 3828 | |
35df2755 CB |
3829 | lttng_poll_clean(&events); |
3830 | clean_command_ctx(&cmd_ctx); | |
3831 | ||
3832 | error_listen: | |
3833 | error_create_poll: | |
6993eeb3 | 3834 | error_testpoint: |
273ea72c | 3835 | unlink(client_unix_sock_path); |
76d7553f MD |
3836 | if (client_sock >= 0) { |
3837 | ret = close(client_sock); | |
3838 | if (ret) { | |
3839 | PERROR("close"); | |
3840 | } | |
a4b35e07 | 3841 | } |
35df2755 CB |
3842 | |
3843 | if (err) { | |
840cb59c | 3844 | health_error(); |
35df2755 | 3845 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 3846 | } |
273ea72c | 3847 | |
927ca06a | 3848 | health_unregister(); |
35df2755 CB |
3849 | |
3850 | DBG("Client thread dying"); | |
f6a9efaa DG |
3851 | |
3852 | rcu_unregister_thread(); | |
1d4b027a DG |
3853 | return NULL; |
3854 | } | |
3855 | ||
3856 | ||
fac6795d DG |
3857 | /* |
3858 | * usage function on stderr | |
3859 | */ | |
3860 | static void usage(void) | |
3861 | { | |
b716ce68 | 3862 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3863 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3864 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3865 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3866 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3867 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3868 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3869 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3870 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3871 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3872 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3873 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3874 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3875 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3876 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3877 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3878 | fprintf(stderr, " -V, --version Show version number.\n"); | |
789e0d37 | 3879 | fprintf(stderr, " -S, --sig-parent Send SIGUSR1 to parent pid to notify readiness.\n"); |
d6f42150 DG |
3880 | fprintf(stderr, " -q, --quiet No output at all.\n"); |
3881 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
35f90c40 | 3882 | fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n"); |
3bd1e081 | 3883 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3884 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3885 | } |
3886 | ||
3887 | /* | |
3888 | * daemon argument parsing | |
3889 | */ | |
3890 | static int parse_args(int argc, char **argv) | |
3891 | { | |
3892 | int c; | |
3893 | ||
3894 | static struct option long_options[] = { | |
3895 | { "client-sock", 1, 0, 'c' }, | |
3896 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3897 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3898 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3899 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3900 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3901 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3902 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3903 | { "consumerd32-path", 1, 0, 'u' }, | |
3904 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3905 | { "consumerd64-path", 1, 0, 't' }, | |
3906 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3907 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3908 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3909 | { "help", 0, 0, 'h' }, |
3910 | { "group", 1, 0, 'g' }, | |
3911 | { "version", 0, 0, 'V' }, | |
75462a81 | 3912 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3913 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3914 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3915 | { "no-kernel", 0, 0, 'N' }, |
35f90c40 | 3916 | { "pidfile", 1, 0, 'p' }, |
fac6795d DG |
3917 | { NULL, 0, 0, 0 } |
3918 | }; | |
3919 | ||
3920 | while (1) { | |
3921 | int option_index = 0; | |
35f90c40 | 3922 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:", |
54d01ffb | 3923 | long_options, &option_index); |
fac6795d DG |
3924 | if (c == -1) { |
3925 | break; | |
3926 | } | |
3927 | ||
3928 | switch (c) { | |
3929 | case 0: | |
3930 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3931 | if (optarg) { | |
3932 | fprintf(stderr, " with arg %s\n", optarg); | |
3933 | } | |
3934 | break; | |
b716ce68 | 3935 | case 'c': |
fac6795d DG |
3936 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3937 | break; | |
3938 | case 'a': | |
3939 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3940 | break; | |
3941 | case 'd': | |
3942 | opt_daemon = 1; | |
3943 | break; | |
3944 | case 'g': | |
fb09408a | 3945 | opt_tracing_group = optarg; |
fac6795d DG |
3946 | break; |
3947 | case 'h': | |
3948 | usage(); | |
3949 | exit(EXIT_FAILURE); | |
3950 | case 'V': | |
3951 | fprintf(stdout, "%s\n", VERSION); | |
3952 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3953 | case 'S': |
3954 | opt_sig_parent = 1; | |
3955 | break; | |
d6f42150 | 3956 | case 'E': |
3bd1e081 | 3957 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3958 | break; |
3959 | case 'C': | |
3bd1e081 MD |
3960 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3961 | break; | |
3962 | case 'F': | |
7753dea8 | 3963 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3964 | break; |
3965 | case 'D': | |
7753dea8 MD |
3966 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3967 | break; | |
3968 | case 'H': | |
3969 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3970 | break; | |
3971 | case 'G': | |
3972 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3973 | break; |
4fba7219 DG |
3974 | case 'N': |
3975 | opt_no_kernel = 1; | |
3976 | break; | |
75462a81 | 3977 | case 'q': |
97e19046 | 3978 | lttng_opt_quiet = 1; |
75462a81 | 3979 | break; |
3f9947db | 3980 | case 'v': |
53086306 | 3981 | /* Verbose level can increase using multiple -v */ |
97e19046 | 3982 | lttng_opt_verbose += 1; |
3f9947db | 3983 | break; |
31f73cc9 | 3984 | case 'Z': |
3bd1e081 | 3985 | opt_verbose_consumer += 1; |
31f73cc9 | 3986 | break; |
fb09408a | 3987 | case 'u': |
fc7a59ce | 3988 | consumerd32_bin= optarg; |
ebaeda94 MD |
3989 | break; |
3990 | case 'U': | |
3991 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3992 | break; |
3993 | case 't': | |
fc7a59ce | 3994 | consumerd64_bin = optarg; |
ebaeda94 MD |
3995 | break; |
3996 | case 'T': | |
3997 | consumerd64_libdir = optarg; | |
fb09408a | 3998 | break; |
35f90c40 DG |
3999 | case 'p': |
4000 | opt_pidfile = optarg; | |
4001 | break; | |
fac6795d DG |
4002 | default: |
4003 | /* Unknown option or other error. | |
4004 | * Error is printed by getopt, just return */ | |
4005 | return -1; | |
4006 | } | |
4007 | } | |
4008 | ||
4009 | return 0; | |
4010 | } | |
4011 | ||
4012 | /* | |
d063d709 | 4013 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4014 | * apps_sock - The communication socket for all UST apps. |
4015 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4016 | */ |
cf3af59e | 4017 | static int init_daemon_socket(void) |
fac6795d DG |
4018 | { |
4019 | int ret = 0; | |
4020 | mode_t old_umask; | |
4021 | ||
4022 | old_umask = umask(0); | |
4023 | ||
4024 | /* Create client tool unix socket */ | |
d6f42150 DG |
4025 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4026 | if (client_sock < 0) { | |
4027 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4028 | ret = -1; |
4029 | goto end; | |
4030 | } | |
4031 | ||
b662582b DG |
4032 | /* Set the cloexec flag */ |
4033 | ret = utils_set_fd_cloexec(client_sock); | |
4034 | if (ret < 0) { | |
4035 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
4036 | "Continuing but note that the consumer daemon will have a " | |
4037 | "reference to this socket on exec()", client_sock); | |
4038 | } | |
4039 | ||
fac6795d DG |
4040 | /* File permission MUST be 660 */ |
4041 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4042 | if (ret < 0) { | |
d6f42150 | 4043 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4044 | PERROR("chmod"); |
fac6795d DG |
4045 | goto end; |
4046 | } | |
4047 | ||
4048 | /* Create the application unix socket */ | |
d6f42150 DG |
4049 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4050 | if (apps_sock < 0) { | |
4051 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4052 | ret = -1; |
4053 | goto end; | |
4054 | } | |
4055 | ||
b662582b DG |
4056 | /* Set the cloexec flag */ |
4057 | ret = utils_set_fd_cloexec(apps_sock); | |
4058 | if (ret < 0) { | |
4059 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
4060 | "Continuing but note that the consumer daemon will have a " | |
4061 | "reference to this socket on exec()", apps_sock); | |
4062 | } | |
4063 | ||
d6f42150 | 4064 | /* File permission MUST be 666 */ |
54d01ffb DG |
4065 | ret = chmod(apps_unix_sock_path, |
4066 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4067 | if (ret < 0) { |
d6f42150 | 4068 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4069 | PERROR("chmod"); |
fac6795d DG |
4070 | goto end; |
4071 | } | |
4072 | ||
b662582b DG |
4073 | DBG3("Session daemon client socket %d and application socket %d created", |
4074 | client_sock, apps_sock); | |
4075 | ||
fac6795d DG |
4076 | end: |
4077 | umask(old_umask); | |
4078 | return ret; | |
4079 | } | |
4080 | ||
4081 | /* | |
54d01ffb DG |
4082 | * Check if the global socket is available, and if a daemon is answering at the |
4083 | * other side. If yes, error is returned. | |
fac6795d | 4084 | */ |
cf3af59e | 4085 | static int check_existing_daemon(void) |
fac6795d | 4086 | { |
7d8234d9 | 4087 | /* Is there anybody out there ? */ |
099e26bd | 4088 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4089 | return -EEXIST; |
099e26bd | 4090 | } |
b09c7c76 DG |
4091 | |
4092 | return 0; | |
fac6795d DG |
4093 | } |
4094 | ||
fac6795d | 4095 | /* |
d063d709 | 4096 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4097 | * |
d063d709 | 4098 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4099 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4100 | */ |
be040666 | 4101 | static int set_permissions(char *rundir) |
fac6795d DG |
4102 | { |
4103 | int ret; | |
996b65c8 | 4104 | gid_t gid; |
fac6795d | 4105 | |
6775595e DG |
4106 | ret = allowed_group(); |
4107 | if (ret < 0) { | |
be040666 | 4108 | WARN("No tracing group detected"); |
360e82e5 MD |
4109 | /* Setting gid to 0 if no tracing group is found */ |
4110 | gid = 0; | |
4111 | } else { | |
4112 | gid = ret; | |
fac6795d DG |
4113 | } |
4114 | ||
d6f42150 | 4115 | /* Set lttng run dir */ |
be040666 | 4116 | ret = chown(rundir, 0, gid); |
d6f42150 | 4117 | if (ret < 0) { |
be040666 | 4118 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4119 | PERROR("chown"); |
d6f42150 DG |
4120 | } |
4121 | ||
360e82e5 | 4122 | /* Ensure all applications and tracing group can search the run dir */ |
61076f74 | 4123 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
4124 | if (ret < 0) { |
4125 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 4126 | PERROR("chmod"); |
d1613cf5 JN |
4127 | } |
4128 | ||
d6f42150 | 4129 | /* lttng client socket path */ |
996b65c8 | 4130 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4131 | if (ret < 0) { |
d6f42150 | 4132 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 4133 | PERROR("chown"); |
d6f42150 DG |
4134 | } |
4135 | ||
3bd1e081 MD |
4136 | /* kconsumer error socket path */ |
4137 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4138 | if (ret < 0) { |
3bd1e081 | 4139 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4140 | PERROR("chown"); |
3bd1e081 MD |
4141 | } |
4142 | ||
7753dea8 MD |
4143 | /* 64-bit ustconsumer error socket path */ |
4144 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4145 | if (ret < 0) { | |
4146 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4147 | PERROR("chown"); |
7753dea8 MD |
4148 | } |
4149 | ||
4150 | /* 32-bit ustconsumer compat32 error socket path */ | |
4151 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4152 | if (ret < 0) { |
7753dea8 | 4153 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4154 | PERROR("chown"); |
fac6795d DG |
4155 | } |
4156 | ||
d6f42150 | 4157 | DBG("All permissions are set"); |
e07ae692 | 4158 | |
fac6795d DG |
4159 | return ret; |
4160 | } | |
4161 | ||
d6f42150 | 4162 | /* |
d063d709 | 4163 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4164 | */ |
67e40797 | 4165 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4166 | { |
4167 | int ret; | |
4168 | ||
67e40797 DG |
4169 | DBG3("Creating LTTng run directory: %s", rundir); |
4170 | ||
d1613cf5 | 4171 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4172 | if (ret < 0) { |
b1f11e69 | 4173 | if (errno != EEXIST) { |
67e40797 | 4174 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4175 | goto error; |
4176 | } else { | |
4177 | ret = 0; | |
4178 | } | |
d6f42150 DG |
4179 | } |
4180 | ||
4181 | error: | |
4182 | return ret; | |
4183 | } | |
4184 | ||
4185 | /* | |
d063d709 DG |
4186 | * Setup sockets and directory needed by the kconsumerd communication with the |
4187 | * session daemon. | |
d6f42150 | 4188 | */ |
67e40797 DG |
4189 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4190 | const char *rundir) | |
d6f42150 DG |
4191 | { |
4192 | int ret; | |
67e40797 | 4193 | char path[PATH_MAX]; |
d6f42150 | 4194 | |
67e40797 | 4195 | switch (consumer_data->type) { |
7753dea8 | 4196 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4197 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4198 | break; |
4199 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4200 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4201 | break; |
4202 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4203 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4204 | break; |
4205 | default: | |
4206 | ERR("Consumer type unknown"); | |
4207 | ret = -EINVAL; | |
4208 | goto error; | |
d6f42150 DG |
4209 | } |
4210 | ||
67e40797 DG |
4211 | DBG2("Creating consumer directory: %s", path); |
4212 | ||
d1613cf5 | 4213 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 4214 | if (ret < 0) { |
6beb2242 | 4215 | if (errno != EEXIST) { |
f11e84c2 | 4216 | PERROR("mkdir"); |
3bd1e081 | 4217 | ERR("Failed to create %s", path); |
6beb2242 DG |
4218 | goto error; |
4219 | } | |
f11e84c2 | 4220 | ret = -1; |
d6f42150 DG |
4221 | } |
4222 | ||
4223 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4224 | consumer_data->err_sock = |
4225 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4226 | if (consumer_data->err_sock < 0) { | |
4227 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4228 | ret = -1; |
4229 | goto error; | |
4230 | } | |
4231 | ||
a24f05ab MD |
4232 | /* |
4233 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4234 | * show must go on. | |
4235 | */ | |
4236 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
4237 | if (ret < 0) { | |
4238 | PERROR("utils_set_fd_cloexec"); | |
4239 | /* continue anyway */ | |
4240 | } | |
4241 | ||
d6f42150 | 4242 | /* File permission MUST be 660 */ |
3bd1e081 | 4243 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4244 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4245 | if (ret < 0) { |
3bd1e081 | 4246 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4247 | PERROR("chmod"); |
d6f42150 DG |
4248 | goto error; |
4249 | } | |
4250 | ||
4251 | error: | |
4252 | return ret; | |
4253 | } | |
4254 | ||
fac6795d | 4255 | /* |
d063d709 | 4256 | * Signal handler for the daemon |
cf3af59e | 4257 | * |
54d01ffb DG |
4258 | * Simply stop all worker threads, leaving main() return gracefully after |
4259 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4260 | */ |
4261 | static void sighandler(int sig) | |
4262 | { | |
4263 | switch (sig) { | |
cf3af59e | 4264 | case SIGPIPE: |
af87c45a | 4265 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4266 | return; |
4267 | case SIGINT: | |
af87c45a | 4268 | DBG("SIGINT caught"); |
cf3af59e MD |
4269 | stop_threads(); |
4270 | break; | |
4271 | case SIGTERM: | |
af87c45a | 4272 | DBG("SIGTERM caught"); |
cf3af59e MD |
4273 | stop_threads(); |
4274 | break; | |
4275 | default: | |
4276 | break; | |
fac6795d | 4277 | } |
fac6795d DG |
4278 | } |
4279 | ||
4280 | /* | |
d063d709 | 4281 | * Setup signal handler for : |
1d4b027a | 4282 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4283 | */ |
1d4b027a | 4284 | static int set_signal_handler(void) |
fac6795d | 4285 | { |
1d4b027a DG |
4286 | int ret = 0; |
4287 | struct sigaction sa; | |
4288 | sigset_t sigset; | |
fac6795d | 4289 | |
1d4b027a | 4290 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4291 | PERROR("sigemptyset"); |
1d4b027a DG |
4292 | return ret; |
4293 | } | |
d6f42150 | 4294 | |
1d4b027a DG |
4295 | sa.sa_handler = sighandler; |
4296 | sa.sa_mask = sigset; | |
4297 | sa.sa_flags = 0; | |
4298 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4299 | PERROR("sigaction"); |
1d4b027a | 4300 | return ret; |
d6f42150 DG |
4301 | } |
4302 | ||
1d4b027a | 4303 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4304 | PERROR("sigaction"); |
1d4b027a | 4305 | return ret; |
d6f42150 | 4306 | } |
aaf26714 | 4307 | |
1d4b027a | 4308 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4309 | PERROR("sigaction"); |
1d4b027a | 4310 | return ret; |
8c0faa1d DG |
4311 | } |
4312 | ||
1d4b027a DG |
4313 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4314 | ||
4315 | return ret; | |
fac6795d DG |
4316 | } |
4317 | ||
f3ed775e | 4318 | /* |
d063d709 DG |
4319 | * Set open files limit to unlimited. This daemon can open a large number of |
4320 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4321 | */ |
4322 | static void set_ulimit(void) | |
4323 | { | |
4324 | int ret; | |
4325 | struct rlimit lim; | |
4326 | ||
a88df331 | 4327 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4328 | lim.rlim_cur = 65535; |
4329 | lim.rlim_max = 65535; | |
4330 | ||
4331 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4332 | if (ret < 0) { | |
76d7553f | 4333 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4334 | } |
4335 | } | |
4336 | ||
35f90c40 DG |
4337 | /* |
4338 | * Write pidfile using the rundir and opt_pidfile. | |
4339 | */ | |
4340 | static void write_pidfile(void) | |
4341 | { | |
4342 | int ret; | |
4343 | char pidfile_path[PATH_MAX]; | |
4344 | ||
4345 | assert(rundir); | |
4346 | ||
4347 | if (opt_pidfile) { | |
4348 | strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path)); | |
4349 | } else { | |
4350 | /* Build pidfile path from rundir and opt_pidfile. */ | |
4351 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
4352 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
4353 | if (ret < 0) { | |
4354 | PERROR("snprintf pidfile path"); | |
4355 | goto error; | |
4356 | } | |
4357 | } | |
4358 | ||
4359 | /* | |
4360 | * Create pid file in rundir. Return value is of no importance. The | |
4361 | * execution will continue even though we are not able to write the file. | |
4362 | */ | |
4363 | (void) utils_create_pid_file(getpid(), pidfile_path); | |
4364 | ||
4365 | error: | |
4366 | return; | |
4367 | } | |
4368 | ||
fac6795d DG |
4369 | /* |
4370 | * main | |
4371 | */ | |
4372 | int main(int argc, char **argv) | |
4373 | { | |
fac6795d DG |
4374 | int ret = 0; |
4375 | void *status; | |
ae9e45b3 | 4376 | const char *home_path, *env_app_timeout; |
fac6795d | 4377 | |
335a95b7 MD |
4378 | init_kernel_workarounds(); |
4379 | ||
f6a9efaa DG |
4380 | rcu_register_thread(); |
4381 | ||
7753dea8 | 4382 | setup_consumerd_path(); |
fb09408a | 4383 | |
12744796 DG |
4384 | page_size = sysconf(_SC_PAGESIZE); |
4385 | if (page_size < 0) { | |
4386 | PERROR("sysconf _SC_PAGESIZE"); | |
4387 | page_size = LONG_MAX; | |
4388 | WARN("Fallback page size to %ld", page_size); | |
4389 | } | |
4390 | ||
fac6795d DG |
4391 | /* Parse arguments */ |
4392 | progname = argv[0]; | |
c617c0c6 | 4393 | if ((ret = parse_args(argc, argv)) < 0) { |
cf3af59e | 4394 | goto error; |
fac6795d DG |
4395 | } |
4396 | ||
4397 | /* Daemonize */ | |
4398 | if (opt_daemon) { | |
ceed52b5 MD |
4399 | int i; |
4400 | ||
4401 | /* | |
4402 | * fork | |
4403 | * child: setsid, close FD 0, 1, 2, chdir / | |
4404 | * parent: exit (if fork is successful) | |
4405 | */ | |
53094c05 DG |
4406 | ret = daemon(0, 0); |
4407 | if (ret < 0) { | |
76d7553f | 4408 | PERROR("daemon"); |
cf3af59e | 4409 | goto error; |
53094c05 | 4410 | } |
ceed52b5 MD |
4411 | /* |
4412 | * We are in the child. Make sure all other file | |
4413 | * descriptors are closed, in case we are called with | |
4414 | * more opened file descriptors than the standard ones. | |
4415 | */ | |
4416 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
4417 | (void) close(i); | |
4418 | } | |
4419 | } | |
4420 | ||
4421 | /* Create thread quit pipe */ | |
4422 | if ((ret = init_thread_quit_pipe()) < 0) { | |
4423 | goto error; | |
fac6795d DG |
4424 | } |
4425 | ||
4426 | /* Check if daemon is UID = 0 */ | |
4427 | is_root = !getuid(); | |
4428 | ||
fac6795d | 4429 | if (is_root) { |
990570ed | 4430 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4431 | |
4432 | /* Create global run dir with root access */ | |
4433 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4434 | if (ret < 0) { |
cf3af59e | 4435 | goto error; |
d6f42150 DG |
4436 | } |
4437 | ||
fac6795d | 4438 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4439 | snprintf(apps_unix_sock_path, PATH_MAX, |
4440 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4441 | } |
4442 | ||
4443 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4444 | snprintf(client_unix_sock_path, PATH_MAX, |
4445 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4446 | } | |
0fdd1e2c DG |
4447 | |
4448 | /* Set global SHM for ust */ | |
4449 | if (strlen(wait_shm_path) == 0) { | |
4450 | snprintf(wait_shm_path, PATH_MAX, | |
4451 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4452 | } | |
67e40797 | 4453 | |
44a5e5eb DG |
4454 | if (strlen(health_unix_sock_path) == 0) { |
4455 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4456 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
4457 | } | |
4458 | ||
67e40797 DG |
4459 | /* Setup kernel consumerd path */ |
4460 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4461 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4462 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4463 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4464 | |
4465 | DBG2("Kernel consumer err path: %s", | |
4466 | kconsumer_data.err_unix_sock_path); | |
4467 | DBG2("Kernel consumer cmd path: %s", | |
4468 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4469 | } else { |
feb0f3e5 | 4470 | home_path = utils_get_home_dir(); |
b082db07 | 4471 | if (home_path == NULL) { |
273ea72c DG |
4472 | /* TODO: Add --socket PATH option */ |
4473 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4474 | ret = -EPERM; |
4475 | goto error; | |
b082db07 DG |
4476 | } |
4477 | ||
67e40797 DG |
4478 | /* |
4479 | * Create rundir from home path. This will create something like | |
4480 | * $HOME/.lttng | |
4481 | */ | |
990570ed | 4482 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4483 | if (ret < 0) { |
4484 | ret = -ENOMEM; | |
4485 | goto error; | |
4486 | } | |
4487 | ||
4488 | ret = create_lttng_rundir(rundir); | |
4489 | if (ret < 0) { | |
4490 | goto error; | |
4491 | } | |
4492 | ||
fac6795d | 4493 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4494 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4495 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4496 | } |
4497 | ||
4498 | /* Set the cli tool unix socket path */ | |
4499 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4500 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4501 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4502 | } |
0fdd1e2c DG |
4503 | |
4504 | /* Set global SHM for ust */ | |
4505 | if (strlen(wait_shm_path) == 0) { | |
4506 | snprintf(wait_shm_path, PATH_MAX, | |
d0b96690 | 4507 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); |
0fdd1e2c | 4508 | } |
44a5e5eb DG |
4509 | |
4510 | /* Set health check Unix path */ | |
4511 | if (strlen(health_unix_sock_path) == 0) { | |
4512 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4513 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
4514 | } | |
fac6795d DG |
4515 | } |
4516 | ||
5c827ce0 DG |
4517 | /* Set consumer initial state */ |
4518 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4519 | ust_consumerd_state = CONSUMER_STOPPED; | |
4520 | ||
847177cd DG |
4521 | DBG("Client socket path %s", client_unix_sock_path); |
4522 | DBG("Application socket path %s", apps_unix_sock_path); | |
d0b96690 | 4523 | DBG("Application wait path %s", wait_shm_path); |
67e40797 DG |
4524 | DBG("LTTng run directory path: %s", rundir); |
4525 | ||
4526 | /* 32 bits consumerd path setup */ | |
4527 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4528 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4529 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4530 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4531 | |
4532 | DBG2("UST consumer 32 bits err path: %s", | |
4533 | ustconsumer32_data.err_unix_sock_path); | |
4534 | DBG2("UST consumer 32 bits cmd path: %s", | |
4535 | ustconsumer32_data.cmd_unix_sock_path); | |
4536 | ||
4537 | /* 64 bits consumerd path setup */ | |
4538 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4539 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4540 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4541 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4542 | |
4543 | DBG2("UST consumer 64 bits err path: %s", | |
4544 | ustconsumer64_data.err_unix_sock_path); | |
4545 | DBG2("UST consumer 64 bits cmd path: %s", | |
4546 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4547 | |
273ea72c | 4548 | /* |
7d8234d9 | 4549 | * See if daemon already exist. |
fac6795d | 4550 | */ |
7d8234d9 | 4551 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4552 | ERR("Already running daemon.\n"); |
273ea72c | 4553 | /* |
cf3af59e MD |
4554 | * We do not goto exit because we must not cleanup() |
4555 | * because a daemon is already running. | |
ab118b20 | 4556 | */ |
cf3af59e | 4557 | goto error; |
a88df331 DG |
4558 | } |
4559 | ||
1427f9b2 DG |
4560 | /* |
4561 | * Init UST app hash table. Alloc hash table before this point since | |
4562 | * cleanup() can get called after that point. | |
4563 | */ | |
4564 | ust_app_ht_alloc(); | |
4565 | ||
54d01ffb | 4566 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4567 | |
4568 | /* | |
4569 | * These actions must be executed as root. We do that *after* setting up | |
4570 | * the sockets path because we MUST make the check for another daemon using | |
4571 | * those paths *before* trying to set the kernel consumer sockets and init | |
4572 | * kernel tracer. | |
4573 | */ | |
4574 | if (is_root) { | |
67e40797 | 4575 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4576 | if (ret < 0) { |
4577 | goto exit; | |
4578 | } | |
4579 | ||
a88df331 | 4580 | /* Setup kernel tracer */ |
4fba7219 DG |
4581 | if (!opt_no_kernel) { |
4582 | init_kernel_tracer(); | |
4583 | } | |
a88df331 DG |
4584 | |
4585 | /* Set ulimit for open files */ | |
4586 | set_ulimit(); | |
fac6795d | 4587 | } |
4063050c MD |
4588 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4589 | lttng_fd_init(); | |
fac6795d | 4590 | |
67e40797 DG |
4591 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4592 | if (ret < 0) { | |
4593 | goto exit; | |
4594 | } | |
4595 | ||
4596 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4597 | if (ret < 0) { | |
4598 | goto exit; | |
4599 | } | |
4600 | ||
cf3af59e MD |
4601 | if ((ret = set_signal_handler()) < 0) { |
4602 | goto exit; | |
fac6795d DG |
4603 | } |
4604 | ||
d6f42150 | 4605 | /* Setup the needed unix socket */ |
cf3af59e MD |
4606 | if ((ret = init_daemon_socket()) < 0) { |
4607 | goto exit; | |
fac6795d DG |
4608 | } |
4609 | ||
4610 | /* Set credentials to socket */ | |
be040666 | 4611 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4612 | goto exit; |
fac6795d DG |
4613 | } |
4614 | ||
5b8719f5 DG |
4615 | /* Get parent pid if -S, --sig-parent is specified. */ |
4616 | if (opt_sig_parent) { | |
4617 | ppid = getppid(); | |
4618 | } | |
4619 | ||
7a485870 | 4620 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 DG |
4621 | if (is_root && !opt_no_kernel) { |
4622 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { | |
4623 | goto exit; | |
4624 | } | |
7a485870 DG |
4625 | } |
4626 | ||
0b2dc8df MD |
4627 | /* Setup the thread ht_cleanup communication pipe. */ |
4628 | if (utils_create_pipe_cloexec(ht_cleanup_pipe) < 0) { | |
4629 | goto exit; | |
4630 | } | |
4631 | ||
099e26bd | 4632 | /* Setup the thread apps communication pipe. */ |
ef599319 | 4633 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
4634 | goto exit; |
4635 | } | |
4636 | ||
d0b96690 DG |
4637 | /* Setup the thread apps notify communication pipe. */ |
4638 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) { | |
4639 | goto exit; | |
4640 | } | |
4641 | ||
7972aab2 DG |
4642 | /* Initialize global buffer per UID and PID registry. */ |
4643 | buffer_reg_init_uid_registry(); | |
4644 | buffer_reg_init_pid_registry(); | |
4645 | ||
099e26bd DG |
4646 | /* Init UST command queue. */ |
4647 | cds_wfq_init(&ust_cmd_queue.queue); | |
4648 | ||
273ea72c | 4649 | /* |
54d01ffb DG |
4650 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4651 | * statically declared in session.c | |
273ea72c | 4652 | */ |
54d01ffb | 4653 | session_list_ptr = session_get_list(); |
b5541356 | 4654 | |
5eb91c98 DG |
4655 | /* Set up max poll set size */ |
4656 | lttng_poll_set_max_size(); | |
4657 | ||
2f77fc4b | 4658 | cmd_init(); |
00e2e675 | 4659 | |
ae9e45b3 DG |
4660 | /* Check for the application socket timeout env variable. */ |
4661 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
4662 | if (env_app_timeout) { | |
4663 | app_socket_timeout = atoi(env_app_timeout); | |
4664 | } else { | |
4665 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
4666 | } | |
4667 | ||
35f90c40 DG |
4668 | write_pidfile(); |
4669 | ||
554831e7 MD |
4670 | /* Initialize communication library */ |
4671 | lttcomm_init(); | |
d831c249 DG |
4672 | /* This is to get the TCP timeout value. */ |
4673 | lttcomm_inet_init(); | |
554831e7 | 4674 | |
67e05644 DG |
4675 | /* |
4676 | * Initialize the health check subsystem. This call should set the | |
4677 | * appropriate time values. | |
4678 | */ | |
4679 | health_init(); | |
4680 | ||
0b2dc8df MD |
4681 | /* Create thread to manage the client socket */ |
4682 | ret = pthread_create(&ht_cleanup_thread, NULL, | |
4683 | thread_ht_cleanup, (void *) NULL); | |
4684 | if (ret != 0) { | |
4685 | PERROR("pthread_create ht_cleanup"); | |
4686 | goto exit_ht_cleanup; | |
4687 | } | |
4688 | ||
44a5e5eb DG |
4689 | /* Create thread to manage the client socket */ |
4690 | ret = pthread_create(&health_thread, NULL, | |
4691 | thread_manage_health, (void *) NULL); | |
4692 | if (ret != 0) { | |
4693 | PERROR("pthread_create health"); | |
4694 | goto exit_health; | |
4695 | } | |
4696 | ||
cf3af59e | 4697 | /* Create thread to manage the client socket */ |
099e26bd DG |
4698 | ret = pthread_create(&client_thread, NULL, |
4699 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4700 | if (ret != 0) { |
76d7553f | 4701 | PERROR("pthread_create clients"); |
cf3af59e MD |
4702 | goto exit_client; |
4703 | } | |
fac6795d | 4704 | |
099e26bd DG |
4705 | /* Create thread to dispatch registration */ |
4706 | ret = pthread_create(&dispatch_thread, NULL, | |
4707 | thread_dispatch_ust_registration, (void *) NULL); | |
4708 | if (ret != 0) { | |
76d7553f | 4709 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4710 | goto exit_dispatch; |
4711 | } | |
4712 | ||
4713 | /* Create thread to manage application registration. */ | |
4714 | ret = pthread_create(®_apps_thread, NULL, | |
4715 | thread_registration_apps, (void *) NULL); | |
4716 | if (ret != 0) { | |
76d7553f | 4717 | PERROR("pthread_create registration"); |
099e26bd DG |
4718 | goto exit_reg_apps; |
4719 | } | |
4720 | ||
cf3af59e | 4721 | /* Create thread to manage application socket */ |
54d01ffb DG |
4722 | ret = pthread_create(&apps_thread, NULL, |
4723 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4724 | if (ret != 0) { |
d0b96690 DG |
4725 | PERROR("pthread_create apps"); |
4726 | goto exit_apps; | |
4727 | } | |
4728 | ||
4729 | /* Create thread to manage application notify socket */ | |
4730 | ret = pthread_create(&apps_notify_thread, NULL, | |
4731 | ust_thread_manage_notify, (void *) NULL); | |
4732 | if (ret != 0) { | |
76d7553f | 4733 | PERROR("pthread_create apps"); |
cf3af59e MD |
4734 | goto exit_apps; |
4735 | } | |
fac6795d | 4736 | |
6620da75 DG |
4737 | /* Don't start this thread if kernel tracing is not requested nor root */ |
4738 | if (is_root && !opt_no_kernel) { | |
4739 | /* Create kernel thread to manage kernel event */ | |
4740 | ret = pthread_create(&kernel_thread, NULL, | |
4741 | thread_manage_kernel, (void *) NULL); | |
4742 | if (ret != 0) { | |
4743 | PERROR("pthread_create kernel"); | |
4744 | goto exit_kernel; | |
4745 | } | |
7a485870 | 4746 | |
6620da75 DG |
4747 | ret = pthread_join(kernel_thread, &status); |
4748 | if (ret != 0) { | |
4749 | PERROR("pthread_join"); | |
4750 | goto error; /* join error, exit without cleanup */ | |
4751 | } | |
fac6795d DG |
4752 | } |
4753 | ||
cf3af59e MD |
4754 | exit_kernel: |
4755 | ret = pthread_join(apps_thread, &status); | |
4756 | if (ret != 0) { | |
76d7553f | 4757 | PERROR("pthread_join"); |
cf3af59e MD |
4758 | goto error; /* join error, exit without cleanup */ |
4759 | } | |
fac6795d | 4760 | |
cf3af59e | 4761 | exit_apps: |
099e26bd DG |
4762 | ret = pthread_join(reg_apps_thread, &status); |
4763 | if (ret != 0) { | |
76d7553f | 4764 | PERROR("pthread_join"); |
099e26bd DG |
4765 | goto error; /* join error, exit without cleanup */ |
4766 | } | |
4767 | ||
4768 | exit_reg_apps: | |
4769 | ret = pthread_join(dispatch_thread, &status); | |
4770 | if (ret != 0) { | |
76d7553f | 4771 | PERROR("pthread_join"); |
099e26bd DG |
4772 | goto error; /* join error, exit without cleanup */ |
4773 | } | |
4774 | ||
4775 | exit_dispatch: | |
cf3af59e MD |
4776 | ret = pthread_join(client_thread, &status); |
4777 | if (ret != 0) { | |
76d7553f | 4778 | PERROR("pthread_join"); |
cf3af59e MD |
4779 | goto error; /* join error, exit without cleanup */ |
4780 | } | |
4781 | ||
3bd1e081 | 4782 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4783 | if (ret != 0) { |
76d7553f | 4784 | PERROR("join_consumer"); |
cf3af59e MD |
4785 | goto error; /* join error, exit without cleanup */ |
4786 | } | |
a88df331 | 4787 | |
06f525de DG |
4788 | ret = join_consumer_thread(&ustconsumer32_data); |
4789 | if (ret != 0) { | |
4790 | PERROR("join_consumer ust32"); | |
4791 | goto error; /* join error, exit without cleanup */ | |
4792 | } | |
4793 | ||
4794 | ret = join_consumer_thread(&ustconsumer64_data); | |
4795 | if (ret != 0) { | |
4796 | PERROR("join_consumer ust64"); | |
4797 | goto error; /* join error, exit without cleanup */ | |
4798 | } | |
4799 | ||
cf3af59e | 4800 | exit_client: |
06f525de DG |
4801 | ret = pthread_join(health_thread, &status); |
4802 | if (ret != 0) { | |
4803 | PERROR("pthread_join health thread"); | |
4804 | goto error; /* join error, exit without cleanup */ | |
4805 | } | |
4806 | ||
44a5e5eb | 4807 | exit_health: |
0b2dc8df MD |
4808 | ret = pthread_join(ht_cleanup_thread, &status); |
4809 | if (ret != 0) { | |
4810 | PERROR("pthread_join ht cleanup thread"); | |
4811 | goto error; /* join error, exit without cleanup */ | |
4812 | } | |
4813 | exit_ht_cleanup: | |
a88df331 | 4814 | exit: |
cf3af59e MD |
4815 | /* |
4816 | * cleanup() is called when no other thread is running. | |
4817 | */ | |
f6a9efaa | 4818 | rcu_thread_online(); |
cf3af59e | 4819 | cleanup(); |
f6a9efaa DG |
4820 | rcu_thread_offline(); |
4821 | rcu_unregister_thread(); | |
67e40797 | 4822 | if (!ret) { |
cf3af59e | 4823 | exit(EXIT_SUCCESS); |
67e40797 | 4824 | } |
cf3af59e | 4825 | error: |
5e16da05 | 4826 | exit(EXIT_FAILURE); |
fac6795d | 4827 | } |