Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
54d01ffb DG |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; only version 2 of the License. | |
91d76f53 | 8 | * |
54d01ffb DG |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
91d76f53 | 13 | * |
54d01ffb DG |
14 | * You should have received a copy of the GNU General Public License along with |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <fcntl.h> | |
21 | #include <getopt.h> | |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
8c0faa1d | 25 | #include <semaphore.h> |
fac6795d DG |
26 | #include <signal.h> |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
0fdd1e2c | 30 | #include <sys/mman.h> |
b73401da | 31 | #include <sys/mount.h> |
1e307fab | 32 | #include <sys/resource.h> |
fac6795d DG |
33 | #include <sys/socket.h> |
34 | #include <sys/stat.h> | |
35 | #include <sys/types.h> | |
0fdd1e2c DG |
36 | #include <sys/wait.h> |
37 | #include <urcu/futex.h> | |
fac6795d | 38 | #include <unistd.h> |
3bd1e081 | 39 | #include <config.h> |
fac6795d | 40 | |
3bd1e081 | 41 | #include <lttng-consumerd.h> |
e88129fc | 42 | #include <lttng-sessiond-comm.h> |
3bd1e081 | 43 | #include <lttng/lttng-consumer.h> |
2bdd86d4 | 44 | |
1e307fab | 45 | #include <lttngerr.h> |
fac6795d | 46 | |
54d01ffb | 47 | #include "channel.h" |
5eb91c98 | 48 | #include "compat/poll.h" |
099e26bd | 49 | #include "context.h" |
54d01ffb | 50 | #include "event.h" |
099e26bd | 51 | #include "futex.h" |
f6a9efaa | 52 | #include "hashtable.h" |
20fe2104 | 53 | #include "kernel-ctl.h" |
32258573 | 54 | #include "lttng-sessiond.h" |
0fdd1e2c | 55 | #include "shm.h" |
56fff090 | 56 | #include "ust-app.h" |
1e307fab | 57 | #include "ust-ctl.h" |
8e68d1c8 | 58 | #include "utils.h" |
fac6795d | 59 | |
3bd1e081 MD |
60 | struct consumer_data { |
61 | enum lttng_consumer_type type; | |
62 | ||
63 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
64 | sem_t sem; | |
65 | ||
66 | /* Mutex to control consumerd pid assignation */ | |
67 | pthread_mutex_t pid_mutex; | |
68 | pid_t pid; | |
69 | ||
70 | int err_sock; | |
71 | int cmd_sock; | |
72 | ||
73 | /* consumer error and command Unix socket path */ | |
74 | char err_unix_sock_path[PATH_MAX]; | |
75 | char cmd_unix_sock_path[PATH_MAX]; | |
76 | }; | |
77 | ||
75462a81 | 78 | /* Const values */ |
686204ab | 79 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 80 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
81 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
82 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
83 | ||
fac6795d | 84 | /* Variables */ |
1d4b027a | 85 | int opt_verbose; /* Not static for lttngerr.h */ |
3bd1e081 | 86 | int opt_verbose_consumer; /* Not static for lttngerr.h */ |
1d4b027a | 87 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 88 | |
fac6795d DG |
89 | const char *progname; |
90 | const char *opt_tracing_group; | |
5b8719f5 | 91 | static int opt_sig_parent; |
fac6795d DG |
92 | static int opt_daemon; |
93 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a | 94 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
3bd1e081 MD |
95 | |
96 | /* Consumer daemon specific control data */ | |
97 | static struct consumer_data kconsumer_data = { | |
98 | .type = LTTNG_CONSUMER_KERNEL, | |
99 | }; | |
100 | static struct consumer_data ustconsumer_data = { | |
101 | .type = LTTNG_CONSUMER_UST, | |
102 | }; | |
103 | ||
099e26bd | 104 | static int dispatch_thread_exit; |
fac6795d | 105 | |
54d01ffb DG |
106 | /* Global application Unix socket path */ |
107 | static char apps_unix_sock_path[PATH_MAX]; | |
108 | /* Global client Unix socket path */ | |
109 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
110 | /* global wait shm path for UST */ |
111 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 112 | |
1d4b027a | 113 | /* Sockets and FDs */ |
d6f42150 DG |
114 | static int client_sock; |
115 | static int apps_sock; | |
20fe2104 | 116 | static int kernel_tracer_fd; |
7a485870 | 117 | static int kernel_poll_pipe[2]; |
1d4b027a | 118 | |
273ea72c DG |
119 | /* |
120 | * Quit pipe for all threads. This permits a single cancellation point | |
121 | * for all threads when receiving an event on the pipe. | |
122 | */ | |
123 | static int thread_quit_pipe[2]; | |
124 | ||
099e26bd DG |
125 | /* |
126 | * This pipe is used to inform the thread managing application communication | |
127 | * that a command is queued and ready to be processed. | |
128 | */ | |
129 | static int apps_cmd_pipe[2]; | |
130 | ||
1d4b027a | 131 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 132 | static pthread_t apps_thread; |
099e26bd | 133 | static pthread_t reg_apps_thread; |
1d4b027a | 134 | static pthread_t client_thread; |
7a485870 | 135 | static pthread_t kernel_thread; |
099e26bd | 136 | static pthread_t dispatch_thread; |
5eb91c98 | 137 | |
fac6795d | 138 | |
099e26bd DG |
139 | /* |
140 | * UST registration command queue. This queue is tied with a futex and uses a N | |
141 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
142 | * | |
143 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
144 | * this queue and the wait/wake scheme. | |
145 | */ | |
146 | static struct ust_cmd_queue ust_cmd_queue; | |
147 | ||
b5541356 DG |
148 | /* |
149 | * Pointer initialized before thread creation. | |
150 | * | |
151 | * This points to the tracing session list containing the session count and a | |
152 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
153 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 154 | * |
d063d709 | 155 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 156 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
157 | */ |
158 | static struct ltt_session_list *session_list_ptr; | |
159 | ||
5eb91c98 DG |
160 | /* |
161 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
162 | */ | |
163 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
164 | unsigned int size) | |
165 | { | |
166 | int ret; | |
167 | ||
168 | if (events == NULL || size == 0) { | |
169 | ret = -1; | |
170 | goto error; | |
171 | } | |
172 | ||
173 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
174 | if (ret < 0) { | |
175 | goto error; | |
176 | } | |
177 | ||
178 | /* Add quit pipe */ | |
179 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
180 | if (ret < 0) { | |
181 | goto error; | |
182 | } | |
183 | ||
184 | return 0; | |
185 | ||
186 | error: | |
187 | return ret; | |
188 | } | |
189 | ||
190 | /* | |
191 | * Check if the thread quit pipe was triggered. | |
192 | * | |
193 | * Return 1 if it was triggered else 0; | |
194 | */ | |
195 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
196 | { | |
197 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
198 | return 1; | |
199 | } | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
0fdd1e2c DG |
204 | /* |
205 | * Remove modules in reverse load order. | |
206 | */ | |
207 | static int modprobe_remove_kernel_modules(void) | |
208 | { | |
209 | int ret = 0, i; | |
210 | char modprobe[256]; | |
211 | ||
212 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
213 | ret = snprintf(modprobe, sizeof(modprobe), | |
24b487b8 | 214 | "/sbin/modprobe -r -q %s", |
0fdd1e2c DG |
215 | kernel_modules_list[i].name); |
216 | if (ret < 0) { | |
24b487b8 | 217 | perror("snprintf modprobe -r"); |
0fdd1e2c DG |
218 | goto error; |
219 | } | |
220 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
221 | ret = system(modprobe); | |
222 | if (ret == -1) { | |
24b487b8 | 223 | ERR("Unable to launch modprobe -r for module %s", |
0fdd1e2c DG |
224 | kernel_modules_list[i].name); |
225 | } else if (kernel_modules_list[i].required | |
226 | && WEXITSTATUS(ret) != 0) { | |
227 | ERR("Unable to remove module %s", | |
228 | kernel_modules_list[i].name); | |
229 | } else { | |
230 | DBG("Modprobe removal successful %s", | |
231 | kernel_modules_list[i].name); | |
232 | } | |
233 | } | |
234 | ||
235 | error: | |
236 | return ret; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Return group ID of the tracing group or -1 if not found. | |
241 | */ | |
996b65c8 MD |
242 | static gid_t allowed_group(void) |
243 | { | |
244 | struct group *grp; | |
245 | ||
274e143b MD |
246 | if (opt_tracing_group) { |
247 | grp = getgrnam(opt_tracing_group); | |
248 | } else { | |
249 | grp = getgrnam(default_tracing_group); | |
250 | } | |
996b65c8 MD |
251 | if (!grp) { |
252 | return -1; | |
253 | } else { | |
254 | return grp->gr_gid; | |
255 | } | |
256 | } | |
257 | ||
273ea72c | 258 | /* |
5eb91c98 | 259 | * Init thread quit pipe. |
273ea72c DG |
260 | * |
261 | * Return -1 on error or 0 if all pipes are created. | |
262 | */ | |
263 | static int init_thread_quit_pipe(void) | |
264 | { | |
265 | int ret; | |
266 | ||
267 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
268 | if (ret < 0) { | |
269 | perror("thread quit pipe"); | |
270 | goto error; | |
271 | } | |
272 | ||
273 | error: | |
274 | return ret; | |
275 | } | |
276 | ||
fac6795d | 277 | /* |
d063d709 DG |
278 | * Complete teardown of a kernel session. This free all data structure related |
279 | * to a kernel session and update counter. | |
fac6795d | 280 | */ |
1d4b027a | 281 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 282 | { |
1d4b027a DG |
283 | if (session->kernel_session != NULL) { |
284 | DBG("Tearing down kernel session"); | |
d9800920 DG |
285 | |
286 | /* | |
287 | * If a custom kernel consumer was registered, close the socket before | |
288 | * tearing down the complete kernel session structure | |
289 | */ | |
3bd1e081 | 290 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { |
d9800920 DG |
291 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); |
292 | } | |
293 | ||
62499ad6 | 294 | trace_kernel_destroy_session(session->kernel_session); |
1d4b027a DG |
295 | /* Extra precaution */ |
296 | session->kernel_session = NULL; | |
fac6795d | 297 | } |
fac6795d DG |
298 | } |
299 | ||
f6a9efaa DG |
300 | /* |
301 | * Complete teardown of all UST sessions. This will free everything on his path | |
302 | * and destroy the core essence of all ust sessions :) | |
303 | */ | |
304 | static void teardown_ust_session(struct ltt_session *session) | |
305 | { | |
306 | DBG("Tearing down UST session(s)"); | |
307 | ||
308 | trace_ust_destroy_session(session->ust_session); | |
309 | } | |
310 | ||
099e26bd DG |
311 | /* |
312 | * Stop all threads by closing the thread quit pipe. | |
313 | */ | |
cf3af59e MD |
314 | static void stop_threads(void) |
315 | { | |
5eb91c98 DG |
316 | int ret; |
317 | ||
cf3af59e MD |
318 | /* Stopping all threads */ |
319 | DBG("Terminating all threads"); | |
54d01ffb | 320 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
321 | if (ret < 0) { |
322 | ERR("write error on thread quit pipe"); | |
323 | } | |
324 | ||
099e26bd DG |
325 | /* Dispatch thread */ |
326 | dispatch_thread_exit = 1; | |
327 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
328 | } |
329 | ||
fac6795d | 330 | /* |
d063d709 | 331 | * Cleanup the daemon |
fac6795d | 332 | */ |
cf3af59e | 333 | static void cleanup(void) |
fac6795d | 334 | { |
1d4b027a DG |
335 | int ret; |
336 | char *cmd; | |
af9737e9 | 337 | struct ltt_session *sess, *stmp; |
fac6795d | 338 | |
1d4b027a | 339 | DBG("Cleaning up"); |
e07ae692 | 340 | |
5eb91c98 DG |
341 | if (is_root) { |
342 | DBG("Removing %s directory", LTTNG_RUNDIR); | |
343 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
344 | if (ret < 0) { | |
345 | ERR("asprintf failed. Something is really wrong!"); | |
346 | } | |
5461b305 | 347 | |
5eb91c98 DG |
348 | /* Remove lttng run directory */ |
349 | ret = system(cmd); | |
350 | if (ret < 0) { | |
351 | ERR("Unable to clean " LTTNG_RUNDIR); | |
352 | } | |
1d4b027a | 353 | } |
5461b305 | 354 | |
1d4b027a | 355 | DBG("Cleaning up all session"); |
fac6795d | 356 | |
b5541356 | 357 | /* Destroy session list mutex */ |
273ea72c DG |
358 | if (session_list_ptr != NULL) { |
359 | pthread_mutex_destroy(&session_list_ptr->lock); | |
360 | ||
361 | /* Cleanup ALL session */ | |
54d01ffb DG |
362 | cds_list_for_each_entry_safe(sess, stmp, |
363 | &session_list_ptr->head, list) { | |
273ea72c | 364 | teardown_kernel_session(sess); |
f6a9efaa DG |
365 | teardown_ust_session(sess); |
366 | free(sess); | |
273ea72c DG |
367 | } |
368 | } | |
369 | ||
099e26bd | 370 | DBG("Closing all UST sockets"); |
56fff090 | 371 | ust_app_clean_list(); |
099e26bd | 372 | |
3bd1e081 | 373 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 374 | |
f3ed775e | 375 | DBG("Closing kernel fd"); |
1d4b027a | 376 | close(kernel_tracer_fd); |
ab147185 | 377 | |
2f50c8a3 DG |
378 | if (is_root) { |
379 | DBG("Unloading kernel modules"); | |
380 | modprobe_remove_kernel_modules(); | |
381 | } | |
5eb91c98 DG |
382 | |
383 | close(thread_quit_pipe[0]); | |
384 | close(thread_quit_pipe[1]); | |
421cb601 DG |
385 | |
386 | /* <fun> */ | |
387 | MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" | |
388 | "Matthew, BEET driven development works!%c[%dm", | |
389 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
390 | /* </fun> */ | |
fac6795d DG |
391 | } |
392 | ||
e065084a | 393 | /* |
d063d709 | 394 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 395 | * |
d063d709 | 396 | * Return lttcomm error code. |
e065084a DG |
397 | */ |
398 | static int send_unix_sock(int sock, void *buf, size_t len) | |
399 | { | |
400 | /* Check valid length */ | |
401 | if (len <= 0) { | |
402 | return -1; | |
403 | } | |
404 | ||
405 | return lttcomm_send_unix_sock(sock, buf, len); | |
406 | } | |
407 | ||
5461b305 | 408 | /* |
d063d709 | 409 | * Free memory of a command context structure. |
5461b305 | 410 | */ |
a2fb29a5 | 411 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 412 | { |
a2fb29a5 DG |
413 | DBG("Clean command context structure"); |
414 | if (*cmd_ctx) { | |
415 | if ((*cmd_ctx)->llm) { | |
416 | free((*cmd_ctx)->llm); | |
5461b305 | 417 | } |
a2fb29a5 DG |
418 | if ((*cmd_ctx)->lsm) { |
419 | free((*cmd_ctx)->lsm); | |
5461b305 | 420 | } |
a2fb29a5 DG |
421 | free(*cmd_ctx); |
422 | *cmd_ctx = NULL; | |
5461b305 DG |
423 | } |
424 | } | |
425 | ||
f3ed775e | 426 | /* |
d063d709 | 427 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 428 | */ |
2bdd86d4 | 429 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
3bd1e081 | 430 | int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
431 | { |
432 | int ret; | |
f3ed775e | 433 | struct ltt_kernel_stream *stream; |
3bd1e081 | 434 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 435 | |
3bd1e081 | 436 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 437 | channel->channel->name); |
f3ed775e | 438 | |
3bd1e081 MD |
439 | /* Send channel */ |
440 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
441 | lkm.u.channel.channel_key = channel->fd; | |
442 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
443 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 444 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 445 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 446 | if (ret < 0) { |
3bd1e081 | 447 | perror("send consumer channel"); |
f3ed775e DG |
448 | goto error; |
449 | } | |
450 | ||
3bd1e081 | 451 | /* Send streams */ |
7a485870 | 452 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
453 | if (!stream->fd) { |
454 | continue; | |
455 | } | |
456 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
457 | lkm.u.stream.channel_key = channel->fd; | |
458 | lkm.u.stream.stream_key = stream->fd; | |
459 | lkm.u.stream.state = stream->state; | |
460 | lkm.u.stream.output = channel->channel->attr.output; | |
461 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
462 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); | |
463 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
464 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
465 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
466 | if (ret < 0) { | |
467 | perror("send consumer stream"); | |
468 | goto error; | |
469 | } | |
470 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
471 | if (ret < 0) { | |
472 | perror("send consumer stream ancillary data"); | |
473 | goto error; | |
f3ed775e DG |
474 | } |
475 | } | |
476 | ||
3bd1e081 | 477 | DBG("consumer channel streams sent"); |
f3ed775e DG |
478 | |
479 | return 0; | |
480 | ||
481 | error: | |
482 | return ret; | |
483 | } | |
484 | ||
485 | /* | |
d063d709 | 486 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 487 | */ |
2bdd86d4 | 488 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 489 | struct ltt_kernel_session *session) |
f3ed775e DG |
490 | { |
491 | int ret; | |
492 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
493 | struct lttcomm_consumer_msg lkm; |
494 | int sock = session->consumer_fd; | |
7a485870 DG |
495 | |
496 | DBG("Sending metadata stream fd"); | |
497 | ||
2bdd86d4 | 498 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 499 | if (session->consumer_fd == 0) { |
3bd1e081 | 500 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
501 | } |
502 | ||
7a485870 | 503 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
504 | /* Send metadata channel fd */ |
505 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
506 | lkm.u.channel.channel_key = session->metadata->fd; | |
507 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
508 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
509 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
510 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
511 | if (ret < 0) { | |
512 | perror("send consumer channel"); | |
513 | goto error; | |
514 | } | |
515 | ||
516 | /* Send metadata stream fd */ | |
517 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
518 | lkm.u.stream.channel_key = session->metadata->fd; | |
519 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
520 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
521 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
522 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
523 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); | |
524 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
525 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
526 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
527 | if (ret < 0) { | |
528 | perror("send consumer stream"); | |
529 | goto error; | |
530 | } | |
531 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 532 | if (ret < 0) { |
3bd1e081 | 533 | perror("send consumer stream"); |
7a485870 DG |
534 | goto error; |
535 | } | |
536 | } | |
f3ed775e | 537 | |
f3ed775e | 538 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
2bdd86d4 MD |
539 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan); |
540 | if (ret < 0) { | |
541 | goto error; | |
542 | } | |
543 | } | |
544 | ||
545 | DBG("consumer fds (metadata and channel streams) sent"); | |
546 | ||
547 | return 0; | |
548 | ||
549 | error: | |
550 | return ret; | |
551 | } | |
552 | ||
fac6795d | 553 | /* |
0fdd1e2c | 554 | * Notify UST applications using the shm mmap futex. |
fac6795d | 555 | */ |
0fdd1e2c | 556 | static int notify_ust_apps(int active) |
fac6795d | 557 | { |
0fdd1e2c | 558 | char *wait_shm_mmap; |
fac6795d | 559 | |
0fdd1e2c | 560 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 561 | |
0fdd1e2c DG |
562 | /* See shm.c for this call implying mmap, shm and futex calls */ |
563 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
564 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
565 | goto error; |
566 | } | |
567 | ||
0fdd1e2c DG |
568 | /* Wake waiting process */ |
569 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
570 | ||
571 | /* Apps notified successfully */ | |
572 | return 0; | |
fac6795d DG |
573 | |
574 | error: | |
0fdd1e2c | 575 | return -1; |
fac6795d DG |
576 | } |
577 | ||
e065084a | 578 | /* |
d063d709 DG |
579 | * Setup the outgoing data buffer for the response (llm) by allocating the |
580 | * right amount of memory and copying the original information from the lsm | |
581 | * structure. | |
ca95a216 | 582 | * |
d063d709 | 583 | * Return total size of the buffer pointed by buf. |
ca95a216 | 584 | */ |
5461b305 | 585 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 586 | { |
f3ed775e | 587 | int ret, buf_size; |
ca95a216 | 588 | |
f3ed775e | 589 | buf_size = size; |
5461b305 DG |
590 | |
591 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
592 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 593 | perror("malloc"); |
5461b305 | 594 | ret = -ENOMEM; |
ca95a216 DG |
595 | goto error; |
596 | } | |
597 | ||
5461b305 DG |
598 | /* Copy common data */ |
599 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 600 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 601 | |
5461b305 DG |
602 | cmd_ctx->llm->data_size = size; |
603 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
604 | ||
ca95a216 DG |
605 | return buf_size; |
606 | ||
607 | error: | |
608 | return ret; | |
609 | } | |
610 | ||
7a485870 | 611 | /* |
5eb91c98 | 612 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 613 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 614 | */ |
5eb91c98 | 615 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 616 | { |
5eb91c98 | 617 | int ret; |
7a485870 DG |
618 | struct ltt_session *session; |
619 | struct ltt_kernel_channel *channel; | |
620 | ||
5eb91c98 | 621 | DBG("Updating kernel poll set"); |
7a485870 | 622 | |
54d01ffb | 623 | session_lock_list(); |
b5541356 | 624 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 625 | session_lock(session); |
7a485870 | 626 | if (session->kernel_session == NULL) { |
54d01ffb | 627 | session_unlock(session); |
7a485870 DG |
628 | continue; |
629 | } | |
7a485870 | 630 | |
54d01ffb DG |
631 | cds_list_for_each_entry(channel, |
632 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
633 | /* Add channel fd to the kernel poll set */ |
634 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
635 | if (ret < 0) { | |
54d01ffb | 636 | session_unlock(session); |
5eb91c98 DG |
637 | goto error; |
638 | } | |
639 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 640 | } |
54d01ffb | 641 | session_unlock(session); |
7a485870 | 642 | } |
54d01ffb | 643 | session_unlock_list(); |
7a485870 | 644 | |
5eb91c98 | 645 | return 0; |
7a485870 DG |
646 | |
647 | error: | |
54d01ffb | 648 | session_unlock_list(); |
7a485870 DG |
649 | return -1; |
650 | } | |
651 | ||
652 | /* | |
54d01ffb | 653 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 654 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 655 | * |
d063d709 | 656 | * Useful for CPU hotplug feature. |
7a485870 | 657 | */ |
2bdd86d4 | 658 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
659 | { |
660 | int ret = 0; | |
661 | struct ltt_session *session; | |
662 | struct ltt_kernel_channel *channel; | |
663 | ||
664 | DBG("Updating kernel streams for channel fd %d", fd); | |
665 | ||
54d01ffb | 666 | session_lock_list(); |
b5541356 | 667 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 668 | session_lock(session); |
7a485870 | 669 | if (session->kernel_session == NULL) { |
54d01ffb | 670 | session_unlock(session); |
7a485870 DG |
671 | continue; |
672 | } | |
d9800920 DG |
673 | |
674 | /* This is not suppose to be 0 but this is an extra security check */ | |
675 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 676 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
677 | } |
678 | ||
5eb91c98 DG |
679 | cds_list_for_each_entry(channel, |
680 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
681 | if (channel->fd == fd) { |
682 | DBG("Channel found, updating kernel streams"); | |
683 | ret = kernel_open_channel_stream(channel); | |
684 | if (ret < 0) { | |
b3c750d2 | 685 | goto error; |
7a485870 | 686 | } |
d9800920 | 687 | |
7a485870 | 688 | /* |
5eb91c98 DG |
689 | * Have we already sent fds to the consumer? If yes, it means |
690 | * that tracing is started so it is safe to send our updated | |
691 | * stream fds. | |
7a485870 | 692 | */ |
3bd1e081 | 693 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 694 | ret = send_kconsumer_channel_streams(consumer_data, |
5eb91c98 | 695 | session->kernel_session->consumer_fd, channel); |
7a485870 | 696 | if (ret < 0) { |
b3c750d2 | 697 | goto error; |
7a485870 DG |
698 | } |
699 | } | |
b3c750d2 | 700 | goto error; |
7a485870 DG |
701 | } |
702 | } | |
54d01ffb | 703 | session_unlock(session); |
7a485870 | 704 | } |
54d01ffb | 705 | session_unlock_list(); |
b3c750d2 | 706 | return ret; |
7a485870 | 707 | |
b3c750d2 | 708 | error: |
54d01ffb DG |
709 | session_unlock(session); |
710 | session_unlock_list(); | |
7a485870 DG |
711 | return ret; |
712 | } | |
713 | ||
487cf67c DG |
714 | /* |
715 | * For each tracing session, update newly registered apps. | |
716 | */ | |
717 | static void update_ust_app(int app_sock) | |
718 | { | |
719 | struct ltt_session *sess, *stmp; | |
720 | ||
721 | /* For all tracing session(s) */ | |
722 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
421cb601 DG |
723 | if (sess->ust_session) { |
724 | ust_app_global_update(sess->ust_session, app_sock); | |
725 | } | |
487cf67c DG |
726 | } |
727 | } | |
728 | ||
7a485870 | 729 | /* |
d063d709 | 730 | * This thread manage event coming from the kernel. |
7a485870 | 731 | * |
d063d709 DG |
732 | * Features supported in this thread: |
733 | * -) CPU Hotplug | |
7a485870 DG |
734 | */ |
735 | static void *thread_manage_kernel(void *data) | |
736 | { | |
5eb91c98 DG |
737 | int ret, i, pollfd, update_poll_flag = 1; |
738 | uint32_t revents, nb_fd; | |
7a485870 | 739 | char tmp; |
5eb91c98 | 740 | struct lttng_poll_event events; |
7a485870 DG |
741 | |
742 | DBG("Thread manage kernel started"); | |
743 | ||
5eb91c98 DG |
744 | ret = create_thread_poll_set(&events, 2); |
745 | if (ret < 0) { | |
746 | goto error; | |
747 | } | |
748 | ||
749 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
750 | if (ret < 0) { | |
751 | goto error; | |
752 | } | |
753 | ||
7a485870 DG |
754 | while (1) { |
755 | if (update_poll_flag == 1) { | |
5f822d0a DG |
756 | /* |
757 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
758 | * quit pipe and the kernel pipe. | |
759 | */ | |
760 | events.nb_fd = 2; | |
761 | ||
5eb91c98 DG |
762 | ret = update_kernel_poll(&events); |
763 | if (ret < 0) { | |
7a485870 DG |
764 | goto error; |
765 | } | |
766 | update_poll_flag = 0; | |
767 | } | |
768 | ||
5eb91c98 DG |
769 | nb_fd = LTTNG_POLL_GETNB(&events); |
770 | ||
771 | DBG("Thread kernel polling on %d fds", nb_fd); | |
772 | ||
773 | /* Zeroed the poll events */ | |
774 | lttng_poll_reset(&events); | |
7a485870 DG |
775 | |
776 | /* Poll infinite value of time */ | |
5eb91c98 | 777 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 778 | if (ret < 0) { |
7a485870 DG |
779 | goto error; |
780 | } else if (ret == 0) { | |
781 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
782 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
783 | "This should not have happened! Continuing..."); | |
7a485870 DG |
784 | continue; |
785 | } | |
786 | ||
5eb91c98 DG |
787 | for (i = 0; i < nb_fd; i++) { |
788 | /* Fetch once the poll data */ | |
789 | revents = LTTNG_POLL_GETEV(&events, i); | |
790 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 791 | |
5eb91c98 DG |
792 | /* Thread quit pipe has been closed. Killing thread. */ |
793 | ret = check_thread_quit_pipe(pollfd, revents); | |
794 | if (ret) { | |
795 | goto error; | |
796 | } | |
7a485870 | 797 | |
5eb91c98 DG |
798 | /* Check for data on kernel pipe */ |
799 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
800 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
801 | update_poll_flag = 1; | |
802 | continue; | |
803 | } else { | |
804 | /* | |
805 | * New CPU detected by the kernel. Adding kernel stream to | |
806 | * kernel session and updating the kernel consumer | |
807 | */ | |
808 | if (revents & LPOLLIN) { | |
2bdd86d4 | 809 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
810 | if (ret < 0) { |
811 | continue; | |
812 | } | |
813 | break; | |
814 | /* | |
815 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
816 | * and unregister kernel stream at this point. | |
817 | */ | |
7a485870 | 818 | } |
7a485870 DG |
819 | } |
820 | } | |
821 | } | |
822 | ||
823 | error: | |
824 | DBG("Kernel thread dying"); | |
273ea72c DG |
825 | close(kernel_poll_pipe[0]); |
826 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
827 | |
828 | lttng_poll_clean(&events); | |
829 | ||
7a485870 DG |
830 | return NULL; |
831 | } | |
832 | ||
1d4b027a | 833 | /* |
3bd1e081 | 834 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 835 | */ |
3bd1e081 | 836 | static void *thread_manage_consumer(void *data) |
1d4b027a | 837 | { |
5eb91c98 DG |
838 | int sock = 0, i, ret, pollfd; |
839 | uint32_t revents, nb_fd; | |
1d4b027a | 840 | enum lttcomm_return_code code; |
5eb91c98 | 841 | struct lttng_poll_event events; |
3bd1e081 | 842 | struct consumer_data *consumer_data = data; |
1d4b027a | 843 | |
3bd1e081 | 844 | DBG("[thread] Manage consumer started"); |
1d4b027a | 845 | |
3bd1e081 | 846 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
847 | if (ret < 0) { |
848 | goto error; | |
849 | } | |
850 | ||
5eb91c98 DG |
851 | /* |
852 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
853 | * Nothing more will be added to this poll set. | |
854 | */ | |
855 | ret = create_thread_poll_set(&events, 2); | |
856 | if (ret < 0) { | |
857 | goto error; | |
858 | } | |
273ea72c | 859 | |
3bd1e081 | 860 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
861 | if (ret < 0) { |
862 | goto error; | |
863 | } | |
864 | ||
865 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
866 | |
867 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 868 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 869 | if (ret < 0) { |
273ea72c DG |
870 | goto error; |
871 | } | |
872 | ||
5eb91c98 DG |
873 | for (i = 0; i < nb_fd; i++) { |
874 | /* Fetch once the poll data */ | |
875 | revents = LTTNG_POLL_GETEV(&events, i); | |
876 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
877 | ||
878 | /* Thread quit pipe has been closed. Killing thread. */ | |
879 | ret = check_thread_quit_pipe(pollfd, revents); | |
880 | if (ret) { | |
881 | goto error; | |
882 | } | |
883 | ||
884 | /* Event on the registration socket */ | |
3bd1e081 | 885 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 886 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 887 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
888 | goto error; |
889 | } | |
890 | } | |
273ea72c DG |
891 | } |
892 | ||
3bd1e081 | 893 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
894 | if (sock < 0) { |
895 | goto error; | |
896 | } | |
897 | ||
3bd1e081 | 898 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 899 | |
712ea556 | 900 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
901 | ret = lttcomm_recv_unix_sock(sock, &code, |
902 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
903 | if (ret <= 0) { |
904 | goto error; | |
905 | } | |
906 | ||
3bd1e081 MD |
907 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
908 | consumer_data->cmd_sock = | |
909 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
910 | if (consumer_data->cmd_sock < 0) { | |
911 | sem_post(&consumer_data->sem); | |
48842b30 | 912 | PERROR("consumer connect"); |
1d4b027a DG |
913 | goto error; |
914 | } | |
915 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
916 | sem_post(&consumer_data->sem); |
917 | DBG("consumer command socket ready"); | |
1d4b027a | 918 | } else { |
3bd1e081 | 919 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
920 | lttcomm_get_readable_code(-code)); |
921 | goto error; | |
922 | } | |
923 | ||
54d01ffb | 924 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 925 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 926 | if (ret < 0) { |
72079cae DG |
927 | goto error; |
928 | } | |
929 | ||
5eb91c98 DG |
930 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
931 | if (ret < 0) { | |
72079cae | 932 | goto error; |
5eb91c98 DG |
933 | } |
934 | ||
935 | /* Update number of fd */ | |
936 | nb_fd = LTTNG_POLL_GETNB(&events); | |
937 | ||
938 | /* Inifinite blocking call, waiting for transmission */ | |
939 | ret = lttng_poll_wait(&events, -1); | |
940 | if (ret < 0) { | |
72079cae DG |
941 | goto error; |
942 | } | |
943 | ||
5eb91c98 DG |
944 | for (i = 0; i < nb_fd; i++) { |
945 | /* Fetch once the poll data */ | |
946 | revents = LTTNG_POLL_GETEV(&events, i); | |
947 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
948 | ||
949 | /* Thread quit pipe has been closed. Killing thread. */ | |
950 | ret = check_thread_quit_pipe(pollfd, revents); | |
951 | if (ret) { | |
952 | goto error; | |
953 | } | |
954 | ||
955 | /* Event on the kconsumerd socket */ | |
956 | if (pollfd == sock) { | |
957 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 958 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
959 | goto error; |
960 | } | |
961 | } | |
962 | } | |
963 | ||
712ea556 | 964 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
965 | ret = lttcomm_recv_unix_sock(sock, &code, |
966 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 967 | if (ret <= 0) { |
3bd1e081 | 968 | ERR("consumer closed the command socket"); |
712ea556 | 969 | goto error; |
6f61d021 | 970 | } |
1d4b027a | 971 | |
3bd1e081 | 972 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 973 | |
1d4b027a | 974 | error: |
3bd1e081 MD |
975 | DBG("consumer thread dying"); |
976 | close(consumer_data->err_sock); | |
977 | close(consumer_data->cmd_sock); | |
5eb91c98 | 978 | close(sock); |
273ea72c | 979 | |
3bd1e081 MD |
980 | unlink(consumer_data->err_unix_sock_path); |
981 | unlink(consumer_data->cmd_unix_sock_path); | |
982 | consumer_data->pid = 0; | |
1d4b027a | 983 | |
5eb91c98 | 984 | lttng_poll_clean(&events); |
0177d773 | 985 | |
5eb91c98 | 986 | return NULL; |
099e26bd DG |
987 | } |
988 | ||
099e26bd DG |
989 | /* |
990 | * This thread manage application communication. | |
1d4b027a DG |
991 | */ |
992 | static void *thread_manage_apps(void *data) | |
099e26bd | 993 | { |
5eb91c98 DG |
994 | int i, ret, pollfd; |
995 | uint32_t revents, nb_fd; | |
099e26bd | 996 | struct ust_command ust_cmd; |
5eb91c98 | 997 | struct lttng_poll_event events; |
099e26bd DG |
998 | |
999 | DBG("[thread] Manage application started"); | |
1000 | ||
f6a9efaa DG |
1001 | rcu_register_thread(); |
1002 | rcu_thread_online(); | |
1003 | ||
5eb91c98 DG |
1004 | ret = create_thread_poll_set(&events, 2); |
1005 | if (ret < 0) { | |
1006 | goto error; | |
1007 | } | |
099e26bd | 1008 | |
5eb91c98 DG |
1009 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1010 | if (ret < 0) { | |
1011 | goto error; | |
1012 | } | |
099e26bd | 1013 | |
5eb91c98 DG |
1014 | while (1) { |
1015 | /* Zeroed the events structure */ | |
1016 | lttng_poll_reset(&events); | |
0177d773 | 1017 | |
5eb91c98 | 1018 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1019 | |
1020 | DBG("Apps thread polling on %d fds", nb_fd); | |
1021 | ||
1022 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 1023 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1024 | if (ret < 0) { |
099e26bd DG |
1025 | goto error; |
1026 | } | |
1027 | ||
5eb91c98 DG |
1028 | for (i = 0; i < nb_fd; i++) { |
1029 | /* Fetch once the poll data */ | |
1030 | revents = LTTNG_POLL_GETEV(&events, i); | |
1031 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1032 | ||
1033 | /* Thread quit pipe has been closed. Killing thread. */ | |
1034 | ret = check_thread_quit_pipe(pollfd, revents); | |
1035 | if (ret) { | |
099e26bd | 1036 | goto error; |
5eb91c98 | 1037 | } |
099e26bd | 1038 | |
5eb91c98 DG |
1039 | /* Inspect the apps cmd pipe */ |
1040 | if (pollfd == apps_cmd_pipe[0]) { | |
1041 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1042 | ERR("Apps command pipe error"); | |
0177d773 | 1043 | goto error; |
5eb91c98 DG |
1044 | } else if (revents & LPOLLIN) { |
1045 | /* Empty pipe */ | |
1046 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1047 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1048 | perror("read apps cmd pipe"); | |
1049 | goto error; | |
1050 | } | |
099e26bd | 1051 | |
5eb91c98 | 1052 | /* Register applicaton to the session daemon */ |
56fff090 | 1053 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1054 | ust_cmd.sock); |
5eb91c98 DG |
1055 | if (ret < 0) { |
1056 | /* Only critical ENOMEM error can be returned here */ | |
1057 | goto error; | |
1058 | } | |
1059 | ||
1060 | ret = ustctl_register_done(ust_cmd.sock); | |
1061 | if (ret < 0) { | |
1062 | /* | |
1063 | * If the registration is not possible, we simply | |
1064 | * unregister the apps and continue | |
1065 | */ | |
56fff090 | 1066 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1067 | } else { |
1068 | /* | |
1069 | * We just need here to monitor the close of the UST | |
1070 | * socket and poll set monitor those by default. | |
1071 | */ | |
1072 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1073 | if (ret < 0) { | |
1074 | goto error; | |
1075 | } | |
1076 | ||
54d01ffb DG |
1077 | DBG("Apps with sock %d added to poll set", |
1078 | ust_cmd.sock); | |
5eb91c98 | 1079 | } |
487cf67c DG |
1080 | |
1081 | /* | |
1082 | * Add channel(s) and event(s) to newly registered apps | |
1083 | * from lttng global UST domain. | |
1084 | */ | |
1085 | update_ust_app(ust_cmd.sock); | |
5eb91c98 | 1086 | break; |
0177d773 | 1087 | } |
5eb91c98 DG |
1088 | } else { |
1089 | /* | |
54d01ffb DG |
1090 | * At this point, we know that a registered application made |
1091 | * the event at poll_wait. | |
5eb91c98 DG |
1092 | */ |
1093 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1094 | /* Removing from the poll set */ | |
1095 | ret = lttng_poll_del(&events, pollfd); | |
1096 | if (ret < 0) { | |
1097 | goto error; | |
1098 | } | |
099e26bd | 1099 | |
5eb91c98 | 1100 | /* Socket closed */ |
56fff090 | 1101 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1102 | break; |
1103 | } | |
099e26bd DG |
1104 | } |
1105 | } | |
099e26bd DG |
1106 | } |
1107 | ||
1108 | error: | |
1109 | DBG("Application communication apps dying"); | |
1110 | close(apps_cmd_pipe[0]); | |
1111 | close(apps_cmd_pipe[1]); | |
1112 | ||
5eb91c98 | 1113 | lttng_poll_clean(&events); |
099e26bd | 1114 | |
f6a9efaa DG |
1115 | rcu_thread_offline(); |
1116 | rcu_unregister_thread(); | |
099e26bd DG |
1117 | return NULL; |
1118 | } | |
1119 | ||
1120 | /* | |
1121 | * Dispatch request from the registration threads to the application | |
1122 | * communication thread. | |
1123 | */ | |
1124 | static void *thread_dispatch_ust_registration(void *data) | |
1125 | { | |
1126 | int ret; | |
1127 | struct cds_wfq_node *node; | |
1128 | struct ust_command *ust_cmd = NULL; | |
1129 | ||
1130 | DBG("[thread] Dispatch UST command started"); | |
1131 | ||
1132 | while (!dispatch_thread_exit) { | |
1133 | /* Atomically prepare the queue futex */ | |
1134 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1135 | ||
1136 | do { | |
1137 | /* Dequeue command for registration */ | |
1138 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1139 | if (node == NULL) { | |
00a17c97 | 1140 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1141 | /* Continue thread execution */ |
1142 | break; | |
1143 | } | |
1144 | ||
1145 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1146 | ||
2f50c8a3 DG |
1147 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1148 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1149 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1150 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1151 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1152 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1153 | /* |
1154 | * Inform apps thread of the new application registration. This | |
1155 | * call is blocking so we can be assured that the data will be read | |
1156 | * at some point in time or wait to the end of the world :) | |
1157 | */ | |
1158 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1159 | sizeof(struct ust_command)); | |
1160 | if (ret < 0) { | |
1161 | perror("write apps cmd pipe"); | |
1162 | if (errno == EBADF) { | |
1163 | /* | |
1164 | * We can't inform the application thread to process | |
1165 | * registration. We will exit or else application | |
1166 | * registration will not occur and tracing will never | |
1167 | * start. | |
1168 | */ | |
1169 | goto error; | |
1170 | } | |
1171 | } | |
1172 | free(ust_cmd); | |
1173 | } while (node != NULL); | |
1174 | ||
1175 | /* Futex wait on queue. Blocking call on futex() */ | |
1176 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1177 | } | |
1178 | ||
1179 | error: | |
1180 | DBG("Dispatch thread dying"); | |
1181 | return NULL; | |
1182 | } | |
1183 | ||
1184 | /* | |
1185 | * This thread manage application registration. | |
1186 | */ | |
1187 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1188 | { |
5eb91c98 DG |
1189 | int sock = 0, i, ret, pollfd; |
1190 | uint32_t revents, nb_fd; | |
1191 | struct lttng_poll_event events; | |
099e26bd DG |
1192 | /* |
1193 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1194 | * freed in the manage apps thread. | |
1195 | */ | |
1196 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1197 | |
099e26bd | 1198 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1199 | |
1200 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1201 | if (ret < 0) { | |
1202 | goto error; | |
1203 | } | |
1204 | ||
5eb91c98 DG |
1205 | /* |
1206 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1207 | * more will be added to this poll set. | |
1208 | */ | |
1209 | ret = create_thread_poll_set(&events, 2); | |
1210 | if (ret < 0) { | |
1211 | goto error; | |
1212 | } | |
273ea72c | 1213 | |
5eb91c98 DG |
1214 | /* Add the application registration socket */ |
1215 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1216 | if (ret < 0) { | |
1217 | goto error; | |
1218 | } | |
273ea72c | 1219 | |
1d4b027a | 1220 | /* Notify all applications to register */ |
0fdd1e2c DG |
1221 | ret = notify_ust_apps(1); |
1222 | if (ret < 0) { | |
1223 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1224 | "Execution continues but there might be problem for already\n" |
1225 | "running applications that wishes to register."); | |
0fdd1e2c | 1226 | } |
1d4b027a DG |
1227 | |
1228 | while (1) { | |
1229 | DBG("Accepting application registration"); | |
273ea72c | 1230 | |
5eb91c98 DG |
1231 | nb_fd = LTTNG_POLL_GETNB(&events); |
1232 | ||
273ea72c | 1233 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1234 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1235 | if (ret < 0) { |
273ea72c DG |
1236 | goto error; |
1237 | } | |
1238 | ||
5eb91c98 DG |
1239 | for (i = 0; i < nb_fd; i++) { |
1240 | /* Fetch once the poll data */ | |
1241 | revents = LTTNG_POLL_GETEV(&events, i); | |
1242 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1243 | |
5eb91c98 DG |
1244 | /* Thread quit pipe has been closed. Killing thread. */ |
1245 | ret = check_thread_quit_pipe(pollfd, revents); | |
1246 | if (ret) { | |
90014c57 DG |
1247 | goto error; |
1248 | } | |
1d4b027a | 1249 | |
5eb91c98 DG |
1250 | /* Event on the registration socket */ |
1251 | if (pollfd == apps_sock) { | |
1252 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1253 | ERR("Register apps socket poll error"); | |
1254 | goto error; | |
1255 | } else if (revents & LPOLLIN) { | |
1256 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1257 | if (sock < 0) { | |
1258 | goto error; | |
1259 | } | |
099e26bd | 1260 | |
5eb91c98 DG |
1261 | /* Create UST registration command for enqueuing */ |
1262 | ust_cmd = malloc(sizeof(struct ust_command)); | |
1263 | if (ust_cmd == NULL) { | |
1264 | perror("ust command malloc"); | |
1265 | goto error; | |
1266 | } | |
1d4b027a | 1267 | |
5eb91c98 DG |
1268 | /* |
1269 | * Using message-based transmissions to ensure we don't | |
1270 | * have to deal with partially received messages. | |
1271 | */ | |
1272 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1273 | sizeof(struct ust_register_msg)); | |
1274 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1275 | if (ret < 0) { | |
1276 | perror("lttcomm_recv_unix_sock register apps"); | |
1277 | } else { | |
1278 | ERR("Wrong size received on apps register"); | |
1279 | } | |
1280 | free(ust_cmd); | |
1281 | close(sock); | |
1282 | continue; | |
1283 | } | |
099e26bd | 1284 | |
5eb91c98 | 1285 | ust_cmd->sock = sock; |
099e26bd | 1286 | |
5eb91c98 DG |
1287 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1288 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1289 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1290 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1291 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1292 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1293 | |
5eb91c98 DG |
1294 | /* |
1295 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1296 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1297 | */ |
1298 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1299 | ||
1300 | /* | |
1301 | * Wake the registration queue futex. Implicit memory | |
1302 | * barrier with the exchange in cds_wfq_enqueue. | |
1303 | */ | |
1304 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1305 | } | |
1306 | } | |
90014c57 | 1307 | } |
1d4b027a DG |
1308 | } |
1309 | ||
1310 | error: | |
0fdd1e2c DG |
1311 | DBG("UST Registration thread dying"); |
1312 | ||
1313 | /* Notify that the registration thread is gone */ | |
1314 | notify_ust_apps(0); | |
1315 | ||
1316 | close(apps_sock); | |
1317 | close(sock); | |
273ea72c | 1318 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1319 | |
5eb91c98 DG |
1320 | lttng_poll_clean(&events); |
1321 | ||
1d4b027a DG |
1322 | return NULL; |
1323 | } | |
1324 | ||
8c0faa1d | 1325 | /* |
3bd1e081 | 1326 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1327 | * exec or it will fails. |
8c0faa1d | 1328 | */ |
3bd1e081 | 1329 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1330 | { |
1331 | int ret; | |
ee0b0061 DG |
1332 | struct timespec timeout; |
1333 | ||
1334 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1335 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1336 | |
1337 | /* Setup semaphore */ | |
3bd1e081 | 1338 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1339 | if (ret < 0) { |
3bd1e081 | 1340 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1341 | goto error; |
1342 | } | |
8c0faa1d | 1343 | |
3bd1e081 MD |
1344 | ret = pthread_create(&consumer_data->thread, NULL, |
1345 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1346 | if (ret != 0) { |
3bd1e081 | 1347 | PERROR("pthread_create consumer"); |
ee0b0061 | 1348 | ret = -1; |
8c0faa1d DG |
1349 | goto error; |
1350 | } | |
1351 | ||
ee0b0061 DG |
1352 | /* Get time for sem_timedwait absolute timeout */ |
1353 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1354 | if (ret < 0) { | |
3bd1e081 | 1355 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1356 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1357 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1358 | } else { |
1359 | /* Normal timeout if the gettime was successful */ | |
1360 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1361 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1362 | } |
8c0faa1d | 1363 | |
ee0b0061 DG |
1364 | if (ret < 0) { |
1365 | if (errno == ETIMEDOUT) { | |
1366 | /* | |
1367 | * Call has timed out so we kill the kconsumerd_thread and return | |
1368 | * an error. | |
1369 | */ | |
3bd1e081 MD |
1370 | ERR("The consumer thread was never ready. Killing it"); |
1371 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1372 | if (ret < 0) { |
3bd1e081 | 1373 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1374 | } |
1375 | } else { | |
3bd1e081 | 1376 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1377 | } |
1378 | goto error; | |
1379 | } | |
1380 | ||
3bd1e081 MD |
1381 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1382 | if (consumer_data->pid == 0) { | |
712ea556 | 1383 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1384 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1385 | goto error; |
1386 | } | |
3bd1e081 | 1387 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1388 | |
8c0faa1d DG |
1389 | return 0; |
1390 | ||
1391 | error: | |
1392 | return ret; | |
1393 | } | |
1394 | ||
d9800920 | 1395 | /* |
3bd1e081 | 1396 | * Join consumer thread |
d9800920 | 1397 | */ |
3bd1e081 | 1398 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1399 | { |
1400 | void *status; | |
1401 | int ret; | |
1402 | ||
3bd1e081 MD |
1403 | if (consumer_data->pid != 0) { |
1404 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1405 | if (ret) { |
3bd1e081 | 1406 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1407 | return ret; |
1408 | } | |
3bd1e081 | 1409 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1410 | } else { |
1411 | return 0; | |
1412 | } | |
1413 | } | |
1414 | ||
8c0faa1d | 1415 | /* |
3bd1e081 | 1416 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1417 | * |
d063d709 | 1418 | * Return pid if successful else -1. |
8c0faa1d | 1419 | */ |
3bd1e081 | 1420 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1421 | { |
1422 | int ret; | |
1423 | pid_t pid; | |
53086306 | 1424 | const char *verbosity; |
8c0faa1d | 1425 | |
3bd1e081 | 1426 | DBG("Spawning consumerd"); |
c49dc785 | 1427 | |
8c0faa1d DG |
1428 | pid = fork(); |
1429 | if (pid == 0) { | |
1430 | /* | |
3bd1e081 | 1431 | * Exec consumerd. |
8c0faa1d | 1432 | */ |
3bd1e081 | 1433 | if (opt_verbose > 1 || opt_verbose_consumer) { |
53086306 DG |
1434 | verbosity = "--verbose"; |
1435 | } else { | |
1436 | verbosity = "--quiet"; | |
1437 | } | |
3bd1e081 MD |
1438 | switch (consumer_data->type) { |
1439 | case LTTNG_CONSUMER_KERNEL: | |
1440 | execl(INSTALL_BIN_PATH "/lttng-consumerd", | |
1441 | "lttng-consumerd", verbosity, "-k", NULL); | |
1442 | break; | |
1443 | case LTTNG_CONSUMER_UST: | |
1444 | execl(INSTALL_BIN_PATH "/lttng-consumerd", | |
1445 | "lttng-consumerd", verbosity, "-u", NULL); | |
1446 | break; | |
1447 | default: | |
1448 | perror("unknown consumer type"); | |
1449 | exit(EXIT_FAILURE); | |
1450 | } | |
8c0faa1d DG |
1451 | if (errno != 0) { |
1452 | perror("kernel start consumer exec"); | |
1453 | } | |
1454 | exit(EXIT_FAILURE); | |
1455 | } else if (pid > 0) { | |
1456 | ret = pid; | |
8c0faa1d | 1457 | } else { |
3bd1e081 | 1458 | perror("start consumer fork"); |
8c0faa1d | 1459 | ret = -errno; |
8c0faa1d | 1460 | } |
8c0faa1d DG |
1461 | return ret; |
1462 | } | |
1463 | ||
693bd40b | 1464 | /* |
3bd1e081 | 1465 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1466 | */ |
3bd1e081 | 1467 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1468 | { |
1469 | int ret; | |
1470 | ||
3bd1e081 MD |
1471 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1472 | if (consumer_data->pid != 0) { | |
1473 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1474 | goto end; |
1475 | } | |
693bd40b | 1476 | |
3bd1e081 | 1477 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1478 | if (ret < 0) { |
3bd1e081 MD |
1479 | ERR("Spawning consumerd failed"); |
1480 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1481 | goto error; |
693bd40b | 1482 | } |
c49dc785 | 1483 | |
3bd1e081 MD |
1484 | /* Setting up the consumer_data pid */ |
1485 | consumer_data->pid = ret; | |
48842b30 | 1486 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1487 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1488 | |
3bd1e081 MD |
1489 | DBG2("Spawning consumer control thread"); |
1490 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1491 | if (ret < 0) { |
3bd1e081 | 1492 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1493 | goto error; |
1494 | } | |
1495 | ||
c49dc785 | 1496 | end: |
693bd40b DG |
1497 | return 0; |
1498 | ||
1499 | error: | |
1500 | return ret; | |
1501 | } | |
1502 | ||
b73401da | 1503 | /* |
d063d709 | 1504 | * modprobe_kernel_modules |
b73401da DG |
1505 | */ |
1506 | static int modprobe_kernel_modules(void) | |
1507 | { | |
ab147185 | 1508 | int ret = 0, i; |
b73401da DG |
1509 | char modprobe[256]; |
1510 | ||
ab147185 MD |
1511 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1512 | ret = snprintf(modprobe, sizeof(modprobe), | |
1513 | "/sbin/modprobe %s%s", | |
24b487b8 | 1514 | kernel_modules_list[i].required ? "" : "-q ", |
ab147185 | 1515 | kernel_modules_list[i].name); |
b73401da DG |
1516 | if (ret < 0) { |
1517 | perror("snprintf modprobe"); | |
1518 | goto error; | |
1519 | } | |
ab147185 | 1520 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1521 | ret = system(modprobe); |
ab147185 MD |
1522 | if (ret == -1) { |
1523 | ERR("Unable to launch modprobe for module %s", | |
1524 | kernel_modules_list[i].name); | |
1525 | } else if (kernel_modules_list[i].required | |
d9800920 | 1526 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1527 | ERR("Unable to load module %s", |
1528 | kernel_modules_list[i].name); | |
1529 | } else { | |
1530 | DBG("Modprobe successfully %s", | |
1531 | kernel_modules_list[i].name); | |
1532 | } | |
1533 | } | |
1534 | ||
1535 | error: | |
1536 | return ret; | |
1537 | } | |
1538 | ||
b73401da | 1539 | /* |
d063d709 | 1540 | * mount_debugfs |
b73401da DG |
1541 | */ |
1542 | static int mount_debugfs(char *path) | |
1543 | { | |
1544 | int ret; | |
1545 | char *type = "debugfs"; | |
1546 | ||
996b65c8 | 1547 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1548 | if (ret < 0) { |
7272acf5 | 1549 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1550 | goto error; |
1551 | } | |
1552 | ||
1553 | ret = mount(type, path, type, 0, NULL); | |
1554 | if (ret < 0) { | |
7272acf5 | 1555 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1556 | goto error; |
1557 | } | |
1558 | ||
1559 | DBG("Mounted debugfs successfully at %s", path); | |
1560 | ||
1561 | error: | |
1562 | return ret; | |
1563 | } | |
1564 | ||
8c0faa1d | 1565 | /* |
d063d709 | 1566 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1567 | */ |
f3ed775e | 1568 | static void init_kernel_tracer(void) |
8c0faa1d | 1569 | { |
b73401da DG |
1570 | int ret; |
1571 | char *proc_mounts = "/proc/mounts"; | |
1572 | char line[256]; | |
684d34d2 | 1573 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1574 | FILE *fp; |
1575 | ||
1576 | /* Detect debugfs */ | |
1577 | fp = fopen(proc_mounts, "r"); | |
1578 | if (fp == NULL) { | |
1579 | ERR("Unable to probe %s", proc_mounts); | |
1580 | goto error; | |
1581 | } | |
1582 | ||
1583 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1584 | if (strstr(line, "debugfs") != NULL) { | |
1585 | /* Remove first string */ | |
1586 | strtok(line, " "); | |
1587 | /* Dup string here so we can reuse line later on */ | |
1588 | debugfs_path = strdup(strtok(NULL, " ")); | |
1589 | DBG("Got debugfs path : %s", debugfs_path); | |
1590 | break; | |
1591 | } | |
1592 | } | |
1593 | ||
1594 | fclose(fp); | |
1595 | ||
1596 | /* Mount debugfs if needded */ | |
1597 | if (debugfs_path == NULL) { | |
1598 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1599 | if (ret < 0) { | |
1600 | perror("asprintf debugfs path"); | |
1601 | goto error; | |
1602 | } | |
1603 | ret = mount_debugfs(debugfs_path); | |
1604 | if (ret < 0) { | |
7272acf5 | 1605 | perror("Cannot mount debugfs"); |
b73401da DG |
1606 | goto error; |
1607 | } | |
1608 | } | |
1609 | ||
1610 | /* Modprobe lttng kernel modules */ | |
1611 | ret = modprobe_kernel_modules(); | |
1612 | if (ret < 0) { | |
1613 | goto error; | |
1614 | } | |
1615 | ||
1616 | /* Setup lttng kernel path */ | |
1617 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1618 | if (ret < 0) { | |
1619 | perror("asprintf lttng path"); | |
1620 | goto error; | |
1621 | } | |
1622 | ||
1623 | /* Open debugfs lttng */ | |
1624 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1625 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1626 | DBG("Failed to open %s", lttng_path); |
1627 | goto error; | |
8c0faa1d DG |
1628 | } |
1629 | ||
b73401da DG |
1630 | free(lttng_path); |
1631 | free(debugfs_path); | |
f3ed775e | 1632 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1633 | return; |
1634 | ||
1635 | error: | |
1636 | if (lttng_path) { | |
1637 | free(lttng_path); | |
1638 | } | |
1639 | if (debugfs_path) { | |
1640 | free(debugfs_path); | |
1641 | } | |
1642 | WARN("No kernel tracer available"); | |
1643 | kernel_tracer_fd = 0; | |
1644 | return; | |
f3ed775e | 1645 | } |
33a2b854 | 1646 | |
f3ed775e | 1647 | /* |
54d01ffb | 1648 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1649 | */ |
54d01ffb | 1650 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1651 | { |
f40799e8 | 1652 | int ret = 0; |
8c0faa1d | 1653 | |
3bd1e081 | 1654 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1655 | /* |
54d01ffb DG |
1656 | * Assign default kernel consumer socket if no consumer assigned to the |
1657 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1658 | * an extra security check. | |
d9800920 DG |
1659 | */ |
1660 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1661 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1662 | } |
1663 | ||
2bdd86d4 | 1664 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1665 | if (ret < 0) { |
f3ed775e DG |
1666 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1667 | goto error; | |
1668 | } | |
1d4b027a | 1669 | |
3bd1e081 | 1670 | session->consumer_fds_sent = 1; |
f3ed775e | 1671 | } |
1d4b027a DG |
1672 | |
1673 | error: | |
1674 | return ret; | |
8c0faa1d DG |
1675 | } |
1676 | ||
0177d773 DG |
1677 | /* |
1678 | * Create an UST session and add it to the session ust list. | |
1679 | */ | |
44d3bd01 DG |
1680 | static int create_ust_session(struct ltt_session *session, |
1681 | struct lttng_domain *domain) | |
0177d773 | 1682 | { |
44d3bd01 | 1683 | int ret; |
48842b30 | 1684 | unsigned int uid; |
13384287 | 1685 | struct ltt_ust_session *lus = NULL; |
44d3bd01 DG |
1686 | |
1687 | switch (domain->type) { | |
48842b30 | 1688 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1689 | break; |
1690 | default: | |
13384287 | 1691 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1692 | goto error; |
1693 | } | |
0177d773 DG |
1694 | |
1695 | DBG("Creating UST session"); | |
1696 | ||
48842b30 DG |
1697 | session_lock_list(); |
1698 | uid = session_list_ptr->count; | |
1699 | session_unlock_list(); | |
1700 | ||
1701 | lus = trace_ust_create_session(session->path, uid, domain); | |
0177d773 | 1702 | if (lus == NULL) { |
44d3bd01 | 1703 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1704 | goto error; |
1705 | } | |
1706 | ||
48842b30 | 1707 | ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
0177d773 DG |
1708 | geteuid(), allowed_group()); |
1709 | if (ret < 0) { | |
1710 | if (ret != -EEXIST) { | |
1711 | ERR("Trace directory creation error"); | |
44d3bd01 | 1712 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1713 | goto error; |
1714 | } | |
1715 | } | |
1716 | ||
f6a9efaa DG |
1717 | /* The domain type dictate different actions on session creation */ |
1718 | switch (domain->type) { | |
48842b30 DG |
1719 | case LTTNG_DOMAIN_UST: |
1720 | /* No ustctl for the global UST domain */ | |
1721 | break; | |
1722 | default: | |
36dc12cc | 1723 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1724 | goto error; |
0177d773 | 1725 | } |
f6a9efaa | 1726 | session->ust_session = lus; |
44d3bd01 DG |
1727 | |
1728 | return LTTCOMM_OK; | |
0177d773 DG |
1729 | |
1730 | error: | |
1731 | free(lus); | |
1732 | return ret; | |
1733 | } | |
1734 | ||
333f285e | 1735 | /* |
d063d709 | 1736 | * Create a kernel tracer session then create the default channel. |
333f285e | 1737 | */ |
f3ed775e | 1738 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1739 | { |
f3ed775e | 1740 | int ret; |
f3ed775e DG |
1741 | |
1742 | DBG("Creating kernel session"); | |
1743 | ||
1744 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1745 | if (ret < 0) { | |
1746 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1747 | goto error; | |
333f285e DG |
1748 | } |
1749 | ||
d9800920 | 1750 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1751 | if (kconsumer_data.cmd_sock) { |
1752 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1753 | } |
1754 | ||
63053e7c DG |
1755 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1756 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1757 | if (ret < 0) { |
996b65c8 | 1758 | if (ret != -EEXIST) { |
7a485870 DG |
1759 | ERR("Trace directory creation error"); |
1760 | goto error; | |
1761 | } | |
1762 | } | |
1763 | ||
f3ed775e DG |
1764 | error: |
1765 | return ret; | |
333f285e DG |
1766 | } |
1767 | ||
6c9cc2ab DG |
1768 | /* |
1769 | * Using the session list, filled a lttng_session array to send back to the | |
1770 | * client for session listing. | |
1771 | * | |
1772 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1773 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab DG |
1774 | */ |
1775 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1776 | { | |
1777 | int i = 0; | |
1778 | struct ltt_session *session; | |
1779 | ||
1780 | DBG("Getting all available session"); | |
1781 | /* | |
1782 | * Iterate over session list and append data after the control struct in | |
1783 | * the buffer. | |
1784 | */ | |
1785 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1786 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1787 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1788 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1789 | sessions[i].name[NAME_MAX - 1] = '\0'; |
6c9cc2ab DG |
1790 | i++; |
1791 | } | |
1792 | } | |
1793 | ||
9f19cc17 DG |
1794 | /* |
1795 | * Fill lttng_channel array of all channels. | |
1796 | */ | |
b551a063 | 1797 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
1798 | struct lttng_channel *channels) |
1799 | { | |
1800 | int i = 0; | |
1801 | struct ltt_kernel_channel *kchan; | |
1802 | ||
1803 | DBG("Listing channels for session %s", session->name); | |
1804 | ||
b551a063 DG |
1805 | switch (domain) { |
1806 | case LTTNG_DOMAIN_KERNEL: | |
1807 | /* Kernel channels */ | |
1808 | if (session->kernel_session != NULL) { | |
1809 | cds_list_for_each_entry(kchan, | |
1810 | &session->kernel_session->channel_list.head, list) { | |
1811 | /* Copy lttng_channel struct to array */ | |
1812 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1813 | channels[i].enabled = kchan->enabled; | |
1814 | i++; | |
1815 | } | |
1816 | } | |
1817 | break; | |
1818 | case LTTNG_DOMAIN_UST: | |
1819 | { | |
1820 | struct cds_lfht_iter iter; | |
1821 | struct ltt_ust_channel *uchan; | |
1822 | ||
1823 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels, | |
1824 | &iter, uchan, node) { | |
1825 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
1826 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
1827 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
1828 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
1829 | channels[i].attr.switch_timer_interval = | |
1830 | uchan->attr.switch_timer_interval; | |
1831 | channels[i].attr.read_timer_interval = | |
1832 | uchan->attr.read_timer_interval; | |
1833 | channels[i].attr.output = uchan->attr.output; | |
1834 | } | |
1835 | break; | |
1836 | } | |
1837 | default: | |
1838 | break; | |
1839 | } | |
1840 | } | |
1841 | ||
1842 | /* | |
1843 | * Create a list of ust global domain events. | |
1844 | */ | |
1845 | static int list_lttng_ust_global_events(char *channel_name, | |
1846 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
1847 | { | |
1848 | int i = 0, ret = 0; | |
1849 | unsigned int nb_event = 0; | |
1850 | struct cds_lfht_iter iter; | |
1851 | struct ltt_ust_channel *uchan; | |
1852 | struct ltt_ust_event *uevent; | |
1853 | struct lttng_event *tmp; | |
1854 | ||
1855 | DBG("Listing UST global events for channel %s", channel_name); | |
1856 | ||
1857 | rcu_read_lock(); | |
1858 | ||
1859 | /* Count events in all channels */ | |
1860 | cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) { | |
1861 | nb_event += hashtable_get_count(uchan->events); | |
1862 | } | |
1863 | ||
1864 | if (nb_event == 0) { | |
1865 | ret = nb_event; | |
1866 | goto error; | |
1867 | } | |
1868 | ||
1869 | DBG3("Listing UST global %d events", nb_event); | |
1870 | ||
1871 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
1872 | if (tmp == NULL) { | |
1873 | ret = -LTTCOMM_FATAL; | |
1874 | goto error; | |
1875 | } | |
1876 | ||
1877 | cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) { | |
1878 | cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) { | |
1879 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); | |
1880 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
1881 | switch (uevent->attr.instrumentation) { | |
1882 | case LTTNG_UST_TRACEPOINT: | |
1883 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
1884 | break; | |
1885 | case LTTNG_UST_PROBE: | |
1886 | tmp[i].type = LTTNG_EVENT_PROBE; | |
1887 | break; | |
1888 | case LTTNG_UST_FUNCTION: | |
1889 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
1890 | break; | |
1891 | } | |
9f19cc17 DG |
1892 | i++; |
1893 | } | |
1894 | } | |
1895 | ||
b551a063 DG |
1896 | ret = nb_event; |
1897 | *events = tmp; | |
1898 | ||
1899 | error: | |
1900 | rcu_read_unlock(); | |
1901 | return ret; | |
9f19cc17 DG |
1902 | } |
1903 | ||
1904 | /* | |
b551a063 | 1905 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 1906 | */ |
b551a063 DG |
1907 | static int list_lttng_kernel_events(char *channel_name, |
1908 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 1909 | { |
b551a063 DG |
1910 | int i = 0, ret; |
1911 | unsigned int nb_event; | |
9f19cc17 | 1912 | struct ltt_kernel_event *event; |
b551a063 DG |
1913 | struct ltt_kernel_channel *kchan; |
1914 | ||
1915 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
1916 | if (kchan == NULL) { | |
1917 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1918 | goto error; | |
1919 | } | |
1920 | ||
1921 | nb_event = kchan->event_count; | |
9f19cc17 DG |
1922 | |
1923 | DBG("Listing events for channel %s", kchan->channel->name); | |
1924 | ||
b551a063 DG |
1925 | if (nb_event == 0) { |
1926 | ret = nb_event; | |
1927 | goto error; | |
1928 | } | |
1929 | ||
1930 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
1931 | if (*events == NULL) { | |
1932 | ret = LTTCOMM_FATAL; | |
1933 | goto error; | |
1934 | } | |
1935 | ||
9f19cc17 DG |
1936 | /* Kernel channels */ |
1937 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
1938 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
1939 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
1940 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
1941 | switch (event->event->instrumentation) { |
1942 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 1943 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
1944 | break; |
1945 | case LTTNG_KERNEL_KPROBE: | |
1946 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
1947 | (*events)[i].type = LTTNG_EVENT_PROBE; |
1948 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
1949 | sizeof(struct lttng_kernel_kprobe)); |
1950 | break; | |
1951 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
1952 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
1953 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
1954 | sizeof(struct lttng_kernel_function)); |
1955 | break; | |
0133c199 | 1956 | case LTTNG_KERNEL_NOOP: |
b551a063 | 1957 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 1958 | break; |
a54bd42d | 1959 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 1960 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 1961 | break; |
7a3d1328 MD |
1962 | case LTTNG_KERNEL_ALL: |
1963 | assert(0); | |
1964 | break; | |
9f19cc17 DG |
1965 | } |
1966 | i++; | |
1967 | } | |
b551a063 DG |
1968 | |
1969 | return nb_event; | |
1970 | ||
1971 | error: | |
1972 | return ret; | |
9f19cc17 DG |
1973 | } |
1974 | ||
fac6795d | 1975 | /* |
54d01ffb | 1976 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 1977 | */ |
54d01ffb DG |
1978 | static int cmd_disable_channel(struct ltt_session *session, |
1979 | int domain, char *channel_name) | |
fac6795d | 1980 | { |
54d01ffb | 1981 | int ret; |
379473d2 | 1982 | |
54d01ffb DG |
1983 | switch (domain) { |
1984 | case LTTNG_DOMAIN_KERNEL: | |
1985 | ret = channel_kernel_disable(session->kernel_session, | |
1986 | channel_name); | |
1987 | if (ret != LTTCOMM_OK) { | |
333f285e DG |
1988 | goto error; |
1989 | } | |
54d01ffb DG |
1990 | |
1991 | kernel_wait_quiescent(kernel_tracer_fd); | |
d0254c7c | 1992 | break; |
44d3bd01 DG |
1993 | case LTTNG_DOMAIN_UST_PID: |
1994 | break; | |
d0254c7c | 1995 | default: |
44d3bd01 | 1996 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
54d01ffb | 1997 | goto error; |
20fe2104 DG |
1998 | } |
1999 | ||
54d01ffb | 2000 | ret = LTTCOMM_OK; |
d65106b1 | 2001 | |
54d01ffb DG |
2002 | error: |
2003 | return ret; | |
2004 | } | |
2005 | ||
56fff090 DG |
2006 | /* |
2007 | * Copy channel from attributes and set it in the application channel list. | |
2008 | */ | |
f6a9efaa | 2009 | /* |
56fff090 DG |
2010 | static int copy_ust_channel_to_app(struct ltt_ust_session *usess, |
2011 | struct lttng_channel *attr, struct ust_app *app) | |
2012 | { | |
2013 | int ret; | |
2014 | struct ltt_ust_channel *uchan, *new_chan; | |
2015 | ||
f6a9efaa | 2016 | uchan = trace_ust_get_channel_by_key(usess->channels, attr->name); |
56fff090 DG |
2017 | if (uchan == NULL) { |
2018 | ret = LTTCOMM_FATAL; | |
2019 | goto error; | |
2020 | } | |
2021 | ||
2022 | new_chan = trace_ust_create_channel(attr, usess->path); | |
2023 | if (new_chan == NULL) { | |
2024 | PERROR("malloc ltt_ust_channel"); | |
2025 | ret = LTTCOMM_FATAL; | |
2026 | goto error; | |
2027 | } | |
2028 | ||
2029 | ret = channel_ust_copy(new_chan, uchan); | |
2030 | if (ret < 0) { | |
2031 | ret = LTTCOMM_FATAL; | |
2032 | goto error; | |
2033 | } | |
2034 | ||
56fff090 DG |
2035 | error: |
2036 | return ret; | |
2037 | } | |
f6a9efaa | 2038 | */ |
56fff090 | 2039 | |
54d01ffb DG |
2040 | /* |
2041 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2042 | */ | |
44d3bd01 DG |
2043 | static int cmd_enable_channel(struct ltt_session *session, |
2044 | struct lttng_domain *domain, struct lttng_channel *attr) | |
54d01ffb DG |
2045 | { |
2046 | int ret; | |
f6a9efaa DG |
2047 | struct ltt_ust_session *usess = session->ust_session; |
2048 | ||
2049 | DBG("Enabling channel %s for session %s", session->name, attr->name); | |
d65106b1 | 2050 | |
44d3bd01 DG |
2051 | switch (domain->type) { |
2052 | case LTTNG_DOMAIN_KERNEL: | |
2053 | { | |
2054 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2055 | |
44d3bd01 DG |
2056 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2057 | session->kernel_session); | |
2058 | if (kchan == NULL) { | |
2059 | ret = channel_kernel_create(session->kernel_session, | |
2060 | attr, kernel_poll_pipe[1]); | |
2061 | } else { | |
2062 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2063 | } | |
2064 | ||
2065 | if (ret != LTTCOMM_OK) { | |
2066 | goto error; | |
2067 | } | |
2068 | ||
2069 | kernel_wait_quiescent(kernel_tracer_fd); | |
2070 | break; | |
2071 | } | |
f6a9efaa DG |
2072 | case LTTNG_DOMAIN_UST: |
2073 | { | |
2074 | struct ltt_ust_channel *uchan; | |
2075 | ||
48842b30 | 2076 | DBG2("Enabling channel for LTTNG_DOMAIN_UST"); |
f6a9efaa | 2077 | |
48842b30 | 2078 | /* Get channel in global UST domain HT */ |
f6a9efaa DG |
2079 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2080 | attr->name); | |
2081 | if (uchan == NULL) { | |
48842b30 | 2082 | uchan = trace_ust_create_channel(attr, usess->pathname); |
f6a9efaa DG |
2083 | if (uchan == NULL) { |
2084 | ret = LTTCOMM_UST_CHAN_FAIL; | |
2085 | goto error; | |
2086 | } | |
2087 | rcu_read_lock(); | |
2088 | hashtable_add_unique(usess->domain_global.channels, &uchan->node); | |
2089 | rcu_read_unlock(); | |
48842b30 | 2090 | DBG2("UST channel %s added to global domain HT", attr->name); |
f6a9efaa DG |
2091 | } else { |
2092 | ret = LTTCOMM_UST_CHAN_EXIST; | |
2093 | goto error; | |
2094 | } | |
2095 | ||
421cb601 DG |
2096 | /* Add channel to all registered applications */ |
2097 | ret = ust_app_add_channel_all(usess, uchan); | |
48842b30 DG |
2098 | if (ret != LTTCOMM_OK) { |
2099 | goto error; | |
2100 | } | |
f6a9efaa DG |
2101 | |
2102 | break; | |
2103 | } | |
44d3bd01 DG |
2104 | case LTTNG_DOMAIN_UST_PID: |
2105 | { | |
f6a9efaa | 2106 | /* |
56fff090 DG |
2107 | int sock; |
2108 | struct ltt_ust_channel *uchan; | |
44d3bd01 | 2109 | struct ltt_ust_session *usess; |
56fff090 | 2110 | struct ust_app *app; |
44d3bd01 DG |
2111 | |
2112 | usess = trace_ust_get_session_by_pid(&session->ust_session_list, | |
2113 | domain->attr.pid); | |
2114 | if (usess == NULL) { | |
2115 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2116 | goto error; | |
2117 | } | |
2118 | ||
56fff090 | 2119 | app = ust_app_get_by_pid(domain->attr.pid); |
44d3bd01 DG |
2120 | if (app == NULL) { |
2121 | ret = LTTCOMM_APP_NOT_FOUND; | |
2122 | goto error; | |
2123 | } | |
56fff090 | 2124 | sock = app->sock; |
44d3bd01 DG |
2125 | |
2126 | uchan = trace_ust_get_channel_by_name(attr->name, usess); | |
2127 | if (uchan == NULL) { | |
56fff090 | 2128 | ret = channel_ust_create(usess, attr, sock); |
44d3bd01 | 2129 | } else { |
56fff090 | 2130 | ret = channel_ust_enable(usess, uchan, sock); |
44d3bd01 DG |
2131 | } |
2132 | ||
2133 | if (ret != LTTCOMM_OK) { | |
2134 | goto error; | |
2135 | } | |
2136 | ||
56fff090 DG |
2137 | ret = copy_ust_channel_to_app(usess, attr, app); |
2138 | if (ret != LTTCOMM_OK) { | |
44d3bd01 DG |
2139 | goto error; |
2140 | } | |
2141 | ||
44d3bd01 DG |
2142 | DBG("UST channel %s created for app sock %d with pid %d", |
2143 | attr->name, app->sock, domain->attr.pid); | |
f6a9efaa DG |
2144 | */ |
2145 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2146 | goto error; | |
44d3bd01 DG |
2147 | } |
2148 | default: | |
2149 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2150 | goto error; | |
54d01ffb DG |
2151 | } |
2152 | ||
2153 | ret = LTTCOMM_OK; | |
2154 | ||
2155 | error: | |
2156 | return ret; | |
2157 | } | |
2158 | ||
2159 | /* | |
2160 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2161 | */ | |
2162 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2163 | char *channel_name, char *event_name) | |
2164 | { | |
2165 | int ret; | |
54d01ffb DG |
2166 | |
2167 | switch (domain) { | |
2168 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2169 | { |
2170 | struct ltt_kernel_channel *kchan; | |
2171 | ||
54d01ffb DG |
2172 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2173 | session->kernel_session); | |
2174 | if (kchan == NULL) { | |
2175 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2176 | goto error; | |
d65106b1 DG |
2177 | } |
2178 | ||
7a3d1328 | 2179 | ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name); |
54d01ffb DG |
2180 | if (ret != LTTCOMM_OK) { |
2181 | goto error; | |
2182 | } | |
2183 | ||
2184 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2185 | break; |
2bdd86d4 MD |
2186 | } |
2187 | case LTTNG_DOMAIN_UST: | |
2bdd86d4 MD |
2188 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2189 | case LTTNG_DOMAIN_UST_PID: | |
2190 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2191 | default: |
2bdd86d4 | 2192 | /* TODO: Other UST domains */ |
54d01ffb DG |
2193 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2194 | goto error; | |
d65106b1 | 2195 | } |
26cc6b4e | 2196 | |
54d01ffb DG |
2197 | ret = LTTCOMM_OK; |
2198 | ||
2199 | error: | |
2200 | return ret; | |
2201 | } | |
2202 | ||
2203 | /* | |
2204 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2205 | */ | |
2206 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2207 | char *channel_name) | |
2208 | { | |
2209 | int ret; | |
2210 | struct ltt_kernel_channel *kchan; | |
2211 | ||
2212 | switch (domain) { | |
2213 | case LTTNG_DOMAIN_KERNEL: | |
2214 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2215 | session->kernel_session); | |
2216 | if (kchan == NULL) { | |
2217 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2218 | goto error; | |
26cc6b4e DG |
2219 | } |
2220 | ||
54d01ffb DG |
2221 | ret = event_kernel_disable_all(session->kernel_session, kchan); |
2222 | if (ret != LTTCOMM_OK) { | |
0b97ec54 | 2223 | goto error; |
26cc6b4e DG |
2224 | } |
2225 | ||
54d01ffb | 2226 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2227 | break; |
54d01ffb DG |
2228 | default: |
2229 | /* TODO: Userspace tracing */ | |
2230 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2231 | goto error; | |
26cc6b4e | 2232 | } |
e953ef25 | 2233 | |
54d01ffb | 2234 | ret = LTTCOMM_OK; |
e953ef25 | 2235 | |
54d01ffb DG |
2236 | error: |
2237 | return ret; | |
2238 | } | |
f5177a38 | 2239 | |
54d01ffb DG |
2240 | /* |
2241 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2242 | */ | |
2243 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2244 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2245 | { | |
2246 | int ret; | |
f5177a38 | 2247 | |
54d01ffb DG |
2248 | switch (domain) { |
2249 | case LTTNG_DOMAIN_KERNEL: | |
2250 | /* Add kernel context to kernel tracer */ | |
2251 | ret = context_kernel_add(session->kernel_session, ctx, | |
2252 | event_name, channel_name); | |
2253 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2254 | goto error; |
e953ef25 | 2255 | } |
2bdd86d4 MD |
2256 | break; |
2257 | case LTTNG_DOMAIN_UST: | |
2258 | { | |
48842b30 DG |
2259 | /* |
2260 | struct ltt_ust_session *usess; | |
e953ef25 | 2261 | |
48842b30 DG |
2262 | cds_list_for_each_entry(usess, &session->ust_session_list.head, list) { |
2263 | ret = context_ust_add(usess, ctx, | |
2264 | event_name, channel_name, domain); | |
2bdd86d4 MD |
2265 | if (ret != LTTCOMM_OK) { |
2266 | goto error; | |
2267 | } | |
2268 | } | |
e953ef25 | 2269 | break; |
48842b30 | 2270 | */ |
2bdd86d4 | 2271 | } |
54d01ffb | 2272 | default: |
2bdd86d4 | 2273 | /* TODO: UST other domains */ |
54d01ffb DG |
2274 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2275 | goto error; | |
e953ef25 | 2276 | } |
950131af | 2277 | |
54d01ffb | 2278 | ret = LTTCOMM_OK; |
950131af | 2279 | |
54d01ffb DG |
2280 | error: |
2281 | return ret; | |
2282 | } | |
2283 | ||
2284 | /* | |
2285 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2286 | */ | |
2287 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2288 | char *channel_name, struct lttng_event *event) | |
2289 | { | |
2290 | int ret; | |
f6cd6b0f | 2291 | struct lttng_channel *attr; |
48842b30 | 2292 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2293 | |
2294 | switch (domain) { | |
2295 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2296 | { |
2297 | struct ltt_kernel_channel *kchan; | |
2298 | ||
54d01ffb DG |
2299 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2300 | session->kernel_session); | |
2301 | if (kchan == NULL) { | |
f6cd6b0f DG |
2302 | attr = channel_new_default_attr(domain); |
2303 | if (attr == NULL) { | |
2304 | ret = LTTCOMM_FATAL; | |
2305 | goto error; | |
2306 | } | |
2307 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2308 | ||
54d01ffb | 2309 | /* This call will notify the kernel thread */ |
44d3bd01 | 2310 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2311 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2312 | if (ret != LTTCOMM_OK) { |
f5177a38 DG |
2313 | goto error; |
2314 | } | |
54d01ffb | 2315 | } |
950131af | 2316 | |
54d01ffb DG |
2317 | /* Get the newly created kernel channel pointer */ |
2318 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2319 | session->kernel_session); | |
2320 | if (kchan == NULL) { | |
2321 | /* This sould not happen... */ | |
2322 | ret = LTTCOMM_FATAL; | |
2323 | goto error; | |
2324 | } | |
f5177a38 | 2325 | |
48842b30 DG |
2326 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2327 | event); | |
54d01ffb | 2328 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2329 | goto error; |
950131af DG |
2330 | } |
2331 | ||
54d01ffb | 2332 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2333 | break; |
2bdd86d4 MD |
2334 | } |
2335 | case LTTNG_DOMAIN_UST: | |
2336 | { | |
48842b30 DG |
2337 | struct ltt_ust_channel *uchan; |
2338 | struct ltt_ust_event *uevent; | |
2bdd86d4 | 2339 | |
48842b30 DG |
2340 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2341 | channel_name); | |
2342 | if (uchan == NULL) { | |
2343 | /* TODO: Create default channel */ | |
2344 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2345 | goto error; | |
2346 | } | |
2bdd86d4 | 2347 | |
48842b30 DG |
2348 | uevent = trace_ust_find_event_by_name(uchan->events, event->name); |
2349 | if (uevent == NULL) { | |
2350 | uevent = trace_ust_create_event(event); | |
2351 | if (uevent == NULL) { | |
2bdd86d4 MD |
2352 | ret = LTTCOMM_FATAL; |
2353 | goto error; | |
2354 | } | |
48842b30 | 2355 | } |
2bdd86d4 | 2356 | |
421cb601 | 2357 | ret = ust_app_add_event_all(usess, uchan, uevent); |
48842b30 DG |
2358 | if (ret < 0) { |
2359 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2360 | goto error; | |
2bdd86d4 | 2361 | } |
487cf67c DG |
2362 | |
2363 | rcu_read_lock(); | |
2364 | hashtable_add_unique(uchan->events, &uevent->node); | |
2365 | rcu_read_unlock(); | |
2bdd86d4 MD |
2366 | break; |
2367 | } | |
2368 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2369 | case LTTNG_DOMAIN_UST_PID: | |
2370 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2371 | default: |
54d01ffb DG |
2372 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2373 | goto error; | |
950131af | 2374 | } |
d36b8583 | 2375 | |
54d01ffb | 2376 | ret = LTTCOMM_OK; |
d36b8583 | 2377 | |
54d01ffb DG |
2378 | error: |
2379 | return ret; | |
2380 | } | |
7d29a247 | 2381 | |
54d01ffb DG |
2382 | /* |
2383 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2384 | */ | |
2385 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2386 | char *channel_name, int event_type) |
54d01ffb DG |
2387 | { |
2388 | int ret; | |
2389 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2390 | |
54d01ffb DG |
2391 | switch (domain) { |
2392 | case LTTNG_DOMAIN_KERNEL: | |
2393 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2394 | session->kernel_session); | |
2395 | if (kchan == NULL) { | |
2396 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2397 | ret = channel_kernel_create(session->kernel_session, NULL, |
2398 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2399 | if (ret != LTTCOMM_OK) { |
2400 | goto error; | |
d36b8583 | 2401 | } |
54d01ffb | 2402 | } |
0d0c377a | 2403 | |
54d01ffb DG |
2404 | /* Get the newly created kernel channel pointer */ |
2405 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2406 | session->kernel_session); | |
2407 | if (kchan == NULL) { | |
2408 | /* This sould not happen... */ | |
2409 | ret = LTTCOMM_FATAL; | |
2410 | goto error; | |
2411 | } | |
0fdd1e2c | 2412 | |
7a3d1328 MD |
2413 | switch (event_type) { |
2414 | case LTTNG_KERNEL_SYSCALL: | |
2415 | ret = event_kernel_enable_all_syscalls(session->kernel_session, | |
8c9ae521 | 2416 | kchan, kernel_tracer_fd); |
7a3d1328 MD |
2417 | break; |
2418 | case LTTNG_KERNEL_TRACEPOINT: | |
8c9ae521 | 2419 | /* |
7a3d1328 MD |
2420 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2421 | * events already registered to the channel. | |
8c9ae521 | 2422 | */ |
7a3d1328 MD |
2423 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2424 | kchan, kernel_tracer_fd); | |
2425 | break; | |
2426 | case LTTNG_KERNEL_ALL: | |
2427 | /* Enable syscalls and tracepoints */ | |
8c9ae521 DG |
2428 | ret = event_kernel_enable_all(session->kernel_session, |
2429 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2430 | break; |
2431 | default: | |
2432 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2433 | goto error; | |
8c9ae521 | 2434 | } |
54d01ffb | 2435 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2436 | goto error; |
d36b8583 DG |
2437 | } |
2438 | ||
54d01ffb | 2439 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2440 | break; |
54d01ffb DG |
2441 | default: |
2442 | /* TODO: Userspace tracing */ | |
2443 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2444 | goto error; | |
d36b8583 | 2445 | } |
f3ed775e | 2446 | |
54d01ffb DG |
2447 | ret = LTTCOMM_OK; |
2448 | ||
2449 | error: | |
2450 | return ret; | |
2451 | } | |
2452 | ||
2453 | /* | |
2454 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2455 | */ | |
2456 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2457 | { | |
2458 | int ret; | |
2459 | ssize_t nb_events = 0; | |
2460 | ||
2461 | switch (domain) { | |
2462 | case LTTNG_DOMAIN_KERNEL: | |
2463 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2464 | if (nb_events < 0) { | |
2465 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2466 | goto error; | |
894be886 | 2467 | } |
54d01ffb | 2468 | break; |
b551a063 DG |
2469 | case LTTNG_DOMAIN_UST: |
2470 | nb_events = ust_app_list_events(events); | |
2471 | if (nb_events < 0) { | |
2472 | ret = LTTCOMM_UST_LIST_FAIL; | |
2473 | goto error; | |
2474 | } | |
2475 | break; | |
54d01ffb | 2476 | default: |
54d01ffb DG |
2477 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2478 | goto error; | |
2479 | } | |
894be886 | 2480 | |
54d01ffb | 2481 | return nb_events; |
7d29a247 | 2482 | |
54d01ffb DG |
2483 | error: |
2484 | /* Return negative value to differentiate return code */ | |
2485 | return -ret; | |
2486 | } | |
b389abbe | 2487 | |
54d01ffb DG |
2488 | /* |
2489 | * Command LTTNG_START_TRACE processed by the client thread. | |
2490 | */ | |
2491 | static int cmd_start_trace(struct ltt_session *session) | |
2492 | { | |
2493 | int ret; | |
54d01ffb | 2494 | struct ltt_kernel_session *ksession; |
48842b30 | 2495 | struct ltt_ust_session *usess = session->ust_session; |
b389abbe | 2496 | |
54d01ffb DG |
2497 | /* Short cut */ |
2498 | ksession = session->kernel_session; | |
5eb91c98 | 2499 | |
54d01ffb DG |
2500 | /* Kernel tracing */ |
2501 | if (ksession != NULL) { | |
2bdd86d4 MD |
2502 | struct ltt_kernel_channel *kchan; |
2503 | ||
54d01ffb DG |
2504 | /* Open kernel metadata */ |
2505 | if (ksession->metadata == NULL) { | |
2506 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2507 | if (ret < 0) { | |
2508 | ret = LTTCOMM_KERN_META_FAIL; | |
2509 | goto error; | |
b389abbe | 2510 | } |
54d01ffb | 2511 | } |
7d29a247 | 2512 | |
54d01ffb DG |
2513 | /* Open kernel metadata stream */ |
2514 | if (ksession->metadata_stream_fd == 0) { | |
2515 | ret = kernel_open_metadata_stream(ksession); | |
2516 | if (ret < 0) { | |
2517 | ERR("Kernel create metadata stream failed"); | |
2518 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2519 | goto error; | |
2520 | } | |
2521 | } | |
2522 | ||
2523 | /* For each channel */ | |
2524 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2525 | if (kchan->stream_count == 0) { | |
2526 | ret = kernel_open_channel_stream(kchan); | |
2527 | if (ret < 0) { | |
2528 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2529 | goto error; |
2530 | } | |
54d01ffb DG |
2531 | /* Update the stream global counter */ |
2532 | ksession->stream_count_global += ret; | |
7d29a247 | 2533 | } |
54d01ffb DG |
2534 | } |
2535 | ||
2536 | /* Setup kernel consumer socket and send fds to it */ | |
2537 | ret = init_kernel_tracing(ksession); | |
2538 | if (ret < 0) { | |
2539 | ret = LTTCOMM_KERN_START_FAIL; | |
2540 | goto error; | |
2541 | } | |
2542 | ||
2543 | /* This start the kernel tracing */ | |
2544 | ret = kernel_start_session(ksession); | |
2545 | if (ret < 0) { | |
2546 | ret = LTTCOMM_KERN_START_FAIL; | |
2547 | goto error; | |
2548 | } | |
2549 | ||
2550 | /* Quiescent wait after starting trace */ | |
2551 | kernel_wait_quiescent(kernel_tracer_fd); | |
2552 | } | |
2553 | ||
36dc12cc DG |
2554 | /* Flag session that trace should start automatically */ |
2555 | usess->start_trace = 1; | |
2556 | ||
421cb601 | 2557 | ret = ust_app_start_trace_all(usess); |
48842b30 DG |
2558 | if (ret < 0) { |
2559 | ret = LTTCOMM_UST_START_FAIL; | |
2560 | goto error; | |
2bdd86d4 | 2561 | } |
54d01ffb DG |
2562 | |
2563 | ret = LTTCOMM_OK; | |
2564 | ||
2565 | error: | |
2566 | return ret; | |
2567 | } | |
2568 | ||
2569 | /* | |
2570 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2571 | */ | |
2572 | static int cmd_stop_trace(struct ltt_session *session) | |
2573 | { | |
2574 | int ret; | |
2575 | struct ltt_kernel_channel *kchan; | |
2576 | struct ltt_kernel_session *ksession; | |
48842b30 DG |
2577 | //struct ltt_ust_session *usess; |
2578 | //struct ltt_ust_channel *ustchan; | |
54d01ffb DG |
2579 | |
2580 | /* Short cut */ | |
2581 | ksession = session->kernel_session; | |
2582 | ||
2583 | /* Kernel tracer */ | |
2584 | if (ksession != NULL) { | |
2585 | DBG("Stop kernel tracing"); | |
2586 | ||
2587 | /* Flush all buffers before stopping */ | |
2588 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2589 | if (ret < 0) { | |
2590 | ERR("Kernel metadata flush failed"); | |
2591 | } | |
f34daff7 | 2592 | |
54d01ffb DG |
2593 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2594 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2595 | if (ret < 0) { |
54d01ffb | 2596 | ERR("Kernel flush buffer error"); |
7d29a247 | 2597 | } |
54d01ffb | 2598 | } |
19e70852 | 2599 | |
54d01ffb DG |
2600 | ret = kernel_stop_session(ksession); |
2601 | if (ret < 0) { | |
2602 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2603 | goto error; |
f3ed775e | 2604 | } |
54d01ffb DG |
2605 | |
2606 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2607 | } |
54d01ffb | 2608 | |
48842b30 | 2609 | #ifdef DISABLE |
2bdd86d4 MD |
2610 | /* Stop each UST session */ |
2611 | DBG("Stop UST tracing"); | |
48842b30 | 2612 | cds_list_for_each_entry(usess, &session->ust_session_list.head, list) { |
2bdd86d4 | 2613 | /* Flush all buffers before stopping */ |
48842b30 | 2614 | ret = ustctl_flush_buffer(usess->sock, usess->metadata->obj); |
2bdd86d4 MD |
2615 | if (ret < 0) { |
2616 | ERR("UST metadata flush failed"); | |
2617 | } | |
2618 | ||
48842b30 DG |
2619 | cds_list_for_each_entry(ustchan, &usess->channels.head, list) { |
2620 | ret = ustctl_flush_buffer(usess->sock, ustchan->obj); | |
2bdd86d4 MD |
2621 | if (ret < 0) { |
2622 | ERR("UST flush buffer error"); | |
2623 | } | |
2624 | } | |
2625 | ||
48842b30 | 2626 | ret = ustctl_stop_session(usess->sock, usess->handle); |
2bdd86d4 MD |
2627 | if (ret < 0) { |
2628 | ret = LTTCOMM_KERN_STOP_FAIL; | |
2629 | goto error; | |
2630 | } | |
2631 | ||
48842b30 | 2632 | ustctl_wait_quiescent(usess->sock); |
2bdd86d4 | 2633 | } |
48842b30 | 2634 | #endif |
54d01ffb DG |
2635 | |
2636 | ret = LTTCOMM_OK; | |
2637 | ||
2638 | error: | |
2639 | return ret; | |
2640 | } | |
2641 | ||
2642 | /* | |
2643 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2644 | */ | |
2645 | static int cmd_create_session(char *name, char *path) | |
2646 | { | |
2647 | int ret; | |
2648 | ||
2649 | ret = session_create(name, path); | |
2650 | if (ret != LTTCOMM_OK) { | |
2651 | goto error; | |
2652 | } | |
2653 | ||
2654 | ret = LTTCOMM_OK; | |
2655 | ||
2656 | error: | |
2657 | return ret; | |
2658 | } | |
2659 | ||
2660 | /* | |
2661 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2662 | */ | |
2663 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2664 | { | |
2665 | int ret; | |
2666 | ||
2667 | /* Clean kernel session teardown */ | |
2668 | teardown_kernel_session(session); | |
2669 | ||
2670 | /* | |
2671 | * Must notify the kernel thread here to update it's poll setin order | |
2672 | * to remove the channel(s)' fd just destroyed. | |
2673 | */ | |
2674 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2675 | if (ret < 0) { | |
2676 | perror("write kernel poll pipe"); | |
2677 | } | |
2678 | ||
271933a4 | 2679 | ret = session_destroy(session); |
54d01ffb DG |
2680 | |
2681 | return ret; | |
2682 | } | |
2683 | ||
2684 | /* | |
2685 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2686 | */ | |
2687 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2688 | { | |
2689 | int ret; | |
2690 | ||
2691 | switch (domain) { | |
2692 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 2693 | { |
54d01ffb | 2694 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 2695 | |
54d01ffb DG |
2696 | kcalibrate.type = calibrate->type; |
2697 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 2698 | if (ret < 0) { |
54d01ffb DG |
2699 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
2700 | goto error; | |
33a2b854 | 2701 | } |
54d01ffb DG |
2702 | break; |
2703 | } | |
2704 | default: | |
2705 | /* TODO: Userspace tracing */ | |
2706 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2707 | goto error; | |
2708 | } | |
33a2b854 | 2709 | |
54d01ffb | 2710 | ret = LTTCOMM_OK; |
33a2b854 | 2711 | |
54d01ffb DG |
2712 | error: |
2713 | return ret; | |
2714 | } | |
7d29a247 | 2715 | |
54d01ffb DG |
2716 | /* |
2717 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2718 | */ | |
2719 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
2720 | char *sock_path) | |
2721 | { | |
2722 | int ret, sock; | |
b389abbe | 2723 | |
54d01ffb DG |
2724 | switch (domain) { |
2725 | case LTTNG_DOMAIN_KERNEL: | |
2726 | /* Can't register a consumer if there is already one */ | |
2727 | if (session->kernel_session->consumer_fd != 0) { | |
2728 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
2729 | goto error; | |
2730 | } | |
2731 | ||
2732 | sock = lttcomm_connect_unix_sock(sock_path); | |
2733 | if (sock < 0) { | |
2734 | ret = LTTCOMM_CONNECT_FAIL; | |
2735 | goto error; | |
2736 | } | |
2737 | ||
2738 | session->kernel_session->consumer_fd = sock; | |
2739 | break; | |
2740 | default: | |
2741 | /* TODO: Userspace tracing */ | |
2742 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2743 | goto error; | |
2744 | } | |
2745 | ||
2746 | ret = LTTCOMM_OK; | |
2747 | ||
2748 | error: | |
2749 | return ret; | |
2750 | } | |
2751 | ||
2752 | /* | |
2753 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2754 | */ | |
2755 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
2756 | struct lttng_domain **domains) | |
2757 | { | |
b551a063 | 2758 | int ret, index = 0; |
54d01ffb DG |
2759 | ssize_t nb_dom = 0; |
2760 | ||
2761 | if (session->kernel_session != NULL) { | |
b551a063 | 2762 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
2763 | nb_dom++; |
2764 | } | |
2765 | ||
b551a063 DG |
2766 | if (session->ust_session != NULL) { |
2767 | DBG3("Listing domains found UST global domain"); | |
2768 | nb_dom++; | |
2769 | } | |
54d01ffb | 2770 | |
b551a063 | 2771 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
2772 | if (*domains == NULL) { |
2773 | ret = -LTTCOMM_FATAL; | |
2774 | goto error; | |
2775 | } | |
2776 | ||
b551a063 DG |
2777 | if (session->kernel_session != NULL) { |
2778 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
2779 | index++; | |
2780 | } | |
2781 | ||
2782 | if (session->ust_session != NULL) { | |
2783 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
2784 | index++; | |
2785 | } | |
54d01ffb | 2786 | |
54d01ffb DG |
2787 | return nb_dom; |
2788 | ||
2789 | error: | |
2790 | return ret; | |
2791 | } | |
2792 | ||
2793 | /* | |
2794 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2795 | */ | |
b551a063 | 2796 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
2797 | struct lttng_channel **channels) |
2798 | { | |
2799 | int ret; | |
2800 | ssize_t nb_chan = 0; | |
2801 | ||
b551a063 DG |
2802 | switch (domain) { |
2803 | case LTTNG_DOMAIN_KERNEL: | |
2804 | if (session->kernel_session != NULL) { | |
2805 | nb_chan = session->kernel_session->channel_count; | |
2806 | } | |
2807 | DBG3("Number of kernel channels %ld", nb_chan); | |
2808 | break; | |
2809 | case LTTNG_DOMAIN_UST: | |
2810 | if (session->ust_session != NULL) { | |
2811 | nb_chan = hashtable_get_count( | |
2812 | session->ust_session->domain_global.channels); | |
2813 | } | |
2814 | DBG3("Number of UST global channels %ld", nb_chan); | |
2815 | break; | |
2816 | default: | |
2817 | *channels = NULL; | |
2818 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
2819 | goto error; |
2820 | } | |
2821 | ||
b551a063 DG |
2822 | if (nb_chan > 0) { |
2823 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
2824 | if (*channels == NULL) { | |
2825 | ret = -LTTCOMM_FATAL; | |
2826 | goto error; | |
2827 | } | |
54d01ffb | 2828 | |
b551a063 DG |
2829 | list_lttng_channels(domain, session, *channels); |
2830 | } else { | |
2831 | *channels = NULL; | |
2832 | } | |
2bdd86d4 | 2833 | |
54d01ffb DG |
2834 | return nb_chan; |
2835 | ||
2836 | error: | |
2837 | return ret; | |
2838 | } | |
2839 | ||
2840 | /* | |
2841 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2842 | */ | |
b551a063 | 2843 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
2844 | char *channel_name, struct lttng_event **events) |
2845 | { | |
b551a063 | 2846 | int ret = 0; |
54d01ffb | 2847 | ssize_t nb_event = 0; |
54d01ffb | 2848 | |
b551a063 DG |
2849 | switch (domain) { |
2850 | case LTTNG_DOMAIN_KERNEL: | |
2851 | if (session->kernel_session != NULL) { | |
2852 | nb_event = list_lttng_kernel_events(channel_name, | |
2853 | session->kernel_session, events); | |
54d01ffb | 2854 | } |
b551a063 DG |
2855 | break; |
2856 | case LTTNG_DOMAIN_UST: | |
2857 | { | |
2858 | if (session->ust_session != NULL) { | |
2859 | nb_event = list_lttng_ust_global_events(channel_name, | |
2860 | &session->ust_session->domain_global, events); | |
2861 | } | |
2862 | break; | |
54d01ffb | 2863 | } |
b551a063 DG |
2864 | default: |
2865 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
2866 | goto error; |
2867 | } | |
2868 | ||
b551a063 | 2869 | ret = nb_event; |
54d01ffb DG |
2870 | |
2871 | error: | |
2872 | return ret; | |
2873 | } | |
2874 | ||
2875 | /* | |
2876 | * Process the command requested by the lttng client within the command | |
2877 | * context structure. This function make sure that the return structure (llm) | |
2878 | * is set and ready for transmission before returning. | |
2879 | * | |
2880 | * Return any error encountered or 0 for success. | |
2881 | */ | |
2882 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
2883 | { | |
2884 | int ret = LTTCOMM_OK; | |
44d3bd01 | 2885 | int need_tracing_session = 1; |
54d01ffb DG |
2886 | |
2887 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2888 | ||
2889 | /* | |
2890 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2891 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2892 | * command. |
2893 | */ | |
2894 | switch(cmd_ctx->lsm->cmd_type) { | |
2895 | case LTTNG_LIST_SESSIONS: | |
2896 | case LTTNG_LIST_TRACEPOINTS: | |
2897 | case LTTNG_LIST_DOMAINS: | |
2898 | case LTTNG_LIST_CHANNELS: | |
2899 | case LTTNG_LIST_EVENTS: | |
2900 | break; | |
2901 | default: | |
2902 | /* Setup lttng message with no payload */ | |
2903 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2904 | if (ret < 0) { | |
2905 | /* This label does not try to unlock the session */ | |
2906 | goto init_setup_error; | |
2907 | } | |
2908 | } | |
2909 | ||
2910 | /* Commands that DO NOT need a session. */ | |
2911 | switch (cmd_ctx->lsm->cmd_type) { | |
2912 | case LTTNG_CALIBRATE: | |
2913 | case LTTNG_CREATE_SESSION: | |
2914 | case LTTNG_LIST_SESSIONS: | |
2915 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 2916 | need_tracing_session = 0; |
54d01ffb DG |
2917 | break; |
2918 | default: | |
2919 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 2920 | session_lock_list(); |
54d01ffb | 2921 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 2922 | session_unlock_list(); |
54d01ffb DG |
2923 | if (cmd_ctx->session == NULL) { |
2924 | if (cmd_ctx->lsm->session.name != NULL) { | |
2925 | ret = LTTCOMM_SESS_NOT_FOUND; | |
2926 | } else { | |
2927 | /* If no session name specified */ | |
2928 | ret = LTTCOMM_SELECT_SESS; | |
2929 | } | |
2930 | goto error; | |
2931 | } else { | |
2932 | /* Acquire lock for the session */ | |
2933 | session_lock(cmd_ctx->session); | |
2934 | } | |
2935 | break; | |
2936 | } | |
b389abbe | 2937 | |
54d01ffb DG |
2938 | /* |
2939 | * Check domain type for specific "pre-action". | |
2940 | */ | |
2941 | switch (cmd_ctx->lsm->domain.type) { | |
2942 | case LTTNG_DOMAIN_KERNEL: | |
2943 | /* Kernel tracer check */ | |
2944 | if (kernel_tracer_fd == 0) { | |
2945 | /* Basically, load kernel tracer modules */ | |
2946 | init_kernel_tracer(); | |
2947 | if (kernel_tracer_fd == 0) { | |
2948 | ret = LTTCOMM_KERN_NA; | |
2949 | goto error; | |
2950 | } | |
2951 | } | |
5eb91c98 | 2952 | |
54d01ffb | 2953 | /* Need a session for kernel command */ |
44d3bd01 | 2954 | if (need_tracing_session) { |
54d01ffb DG |
2955 | if (cmd_ctx->session->kernel_session == NULL) { |
2956 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 2957 | if (ret < 0) { |
54d01ffb | 2958 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
2959 | goto error; |
2960 | } | |
b389abbe | 2961 | } |
7d29a247 | 2962 | |
54d01ffb | 2963 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2964 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2965 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 2966 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
2967 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2968 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2969 | if (ret < 0) { |
54d01ffb DG |
2970 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
2971 | goto error; | |
950131af | 2972 | } |
33a2b854 | 2973 | } |
3bd1e081 | 2974 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
0d0c377a | 2975 | } |
54d01ffb | 2976 | break; |
2bdd86d4 | 2977 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2978 | { |
44d3bd01 | 2979 | if (need_tracing_session) { |
f6a9efaa | 2980 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 DG |
2981 | ret = create_ust_session(cmd_ctx->session, |
2982 | &cmd_ctx->lsm->domain); | |
2983 | if (ret != LTTCOMM_OK) { | |
2984 | goto error; | |
2985 | } | |
2986 | } | |
2bdd86d4 MD |
2987 | /* Start the kernel consumer daemon */ |
2988 | pthread_mutex_lock(&ustconsumer_data.pid_mutex); | |
2989 | if (ustconsumer_data.pid == 0 && | |
2990 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
2991 | pthread_mutex_unlock(&ustconsumer_data.pid_mutex); | |
2992 | ret = start_consumerd(&ustconsumer_data); | |
2993 | if (ret < 0) { | |
2994 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
2995 | goto error; | |
2996 | } | |
48842b30 DG |
2997 | |
2998 | cmd_ctx->session->ust_session->consumer_fd = | |
2999 | ustconsumer_data.cmd_sock; | |
2bdd86d4 MD |
3000 | } |
3001 | pthread_mutex_unlock(&ustconsumer_data.pid_mutex); | |
44d3bd01 DG |
3002 | } |
3003 | break; | |
48842b30 | 3004 | } |
54d01ffb | 3005 | default: |
54d01ffb DG |
3006 | break; |
3007 | } | |
33a2b854 | 3008 | |
54d01ffb DG |
3009 | /* Process by command type */ |
3010 | switch (cmd_ctx->lsm->cmd_type) { | |
3011 | case LTTNG_ADD_CONTEXT: | |
3012 | { | |
3013 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3014 | cmd_ctx->lsm->u.context.channel_name, | |
3015 | cmd_ctx->lsm->u.context.event_name, | |
3016 | &cmd_ctx->lsm->u.context.ctx); | |
3017 | break; | |
3018 | } | |
3019 | case LTTNG_DISABLE_CHANNEL: | |
3020 | { | |
3021 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3022 | cmd_ctx->lsm->u.disable.channel_name); | |
3023 | break; | |
3024 | } | |
3025 | case LTTNG_DISABLE_EVENT: | |
3026 | { | |
3027 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3028 | cmd_ctx->lsm->u.disable.channel_name, | |
3029 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3030 | ret = LTTCOMM_OK; |
3031 | break; | |
3032 | } | |
54d01ffb DG |
3033 | case LTTNG_DISABLE_ALL_EVENT: |
3034 | { | |
2bdd86d4 | 3035 | DBG("Disabling all events"); |
54d01ffb DG |
3036 | |
3037 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3038 | cmd_ctx->lsm->u.disable.channel_name); | |
3039 | break; | |
3040 | } | |
3041 | case LTTNG_ENABLE_CHANNEL: | |
3042 | { | |
44d3bd01 | 3043 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb DG |
3044 | &cmd_ctx->lsm->u.channel.chan); |
3045 | break; | |
3046 | } | |
3047 | case LTTNG_ENABLE_EVENT: | |
3048 | { | |
3049 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3050 | cmd_ctx->lsm->u.enable.channel_name, | |
3051 | &cmd_ctx->lsm->u.enable.event); | |
3052 | break; | |
3053 | } | |
3054 | case LTTNG_ENABLE_ALL_EVENT: | |
3055 | { | |
2bdd86d4 | 3056 | DBG("Enabling all events"); |
54d01ffb DG |
3057 | |
3058 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3059 | cmd_ctx->lsm->u.enable.channel_name, |
3060 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3061 | break; |
3062 | } | |
052da939 | 3063 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3064 | { |
9f19cc17 | 3065 | struct lttng_event *events; |
54d01ffb | 3066 | ssize_t nb_events; |
052da939 | 3067 | |
54d01ffb DG |
3068 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3069 | if (nb_events < 0) { | |
3070 | ret = -nb_events; | |
3071 | goto error; | |
2ef84c95 DG |
3072 | } |
3073 | ||
3074 | /* | |
3075 | * Setup lttng message with payload size set to the event list size in | |
3076 | * bytes and then copy list into the llm payload. | |
3077 | */ | |
052da939 | 3078 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3079 | if (ret < 0) { |
052da939 | 3080 | free(events); |
2ef84c95 DG |
3081 | goto setup_error; |
3082 | } | |
3083 | ||
3084 | /* Copy event list into message payload */ | |
9f19cc17 | 3085 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3086 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3087 | |
9f19cc17 | 3088 | free(events); |
2ef84c95 DG |
3089 | |
3090 | ret = LTTCOMM_OK; | |
3091 | break; | |
3092 | } | |
f3ed775e | 3093 | case LTTNG_START_TRACE: |
8c0faa1d | 3094 | { |
54d01ffb | 3095 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3096 | break; |
3097 | } | |
f3ed775e | 3098 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3099 | { |
54d01ffb | 3100 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3101 | break; |
3102 | } | |
5e16da05 MD |
3103 | case LTTNG_CREATE_SESSION: |
3104 | { | |
54d01ffb DG |
3105 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
3106 | cmd_ctx->lsm->session.path); | |
5e16da05 MD |
3107 | break; |
3108 | } | |
3109 | case LTTNG_DESTROY_SESSION: | |
3110 | { | |
54d01ffb DG |
3111 | ret = cmd_destroy_session(cmd_ctx->session, |
3112 | cmd_ctx->lsm->session.name); | |
5461b305 | 3113 | break; |
5e16da05 | 3114 | } |
9f19cc17 | 3115 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3116 | { |
54d01ffb DG |
3117 | ssize_t nb_dom; |
3118 | struct lttng_domain *domains; | |
5461b305 | 3119 | |
54d01ffb DG |
3120 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3121 | if (nb_dom < 0) { | |
3122 | ret = -nb_dom; | |
3123 | goto error; | |
ce3d728c | 3124 | } |
520ff687 | 3125 | |
54d01ffb | 3126 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3127 | if (ret < 0) { |
3128 | goto setup_error; | |
520ff687 | 3129 | } |
57167058 | 3130 | |
54d01ffb DG |
3131 | /* Copy event list into message payload */ |
3132 | memcpy(cmd_ctx->llm->payload, domains, | |
3133 | nb_dom * sizeof(struct lttng_domain)); | |
3134 | ||
3135 | free(domains); | |
5e16da05 | 3136 | |
5461b305 | 3137 | ret = LTTCOMM_OK; |
5e16da05 MD |
3138 | break; |
3139 | } | |
9f19cc17 | 3140 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3141 | { |
54d01ffb DG |
3142 | size_t nb_chan; |
3143 | struct lttng_channel *channels; | |
3144 | ||
b551a063 DG |
3145 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3146 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3147 | if (nb_chan < 0) { |
3148 | ret = -nb_chan; | |
3149 | goto error; | |
5461b305 | 3150 | } |
ca95a216 | 3151 | |
54d01ffb | 3152 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3153 | if (ret < 0) { |
3154 | goto setup_error; | |
3155 | } | |
9f19cc17 | 3156 | |
54d01ffb DG |
3157 | /* Copy event list into message payload */ |
3158 | memcpy(cmd_ctx->llm->payload, channels, | |
3159 | nb_chan * sizeof(struct lttng_channel)); | |
3160 | ||
3161 | free(channels); | |
9f19cc17 DG |
3162 | |
3163 | ret = LTTCOMM_OK; | |
5461b305 | 3164 | break; |
5e16da05 | 3165 | } |
9f19cc17 | 3166 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3167 | { |
b551a063 | 3168 | ssize_t nb_event; |
684d34d2 | 3169 | struct lttng_event *events = NULL; |
9f19cc17 | 3170 | |
b551a063 | 3171 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3172 | cmd_ctx->lsm->u.list.channel_name, &events); |
3173 | if (nb_event < 0) { | |
3174 | ret = -nb_event; | |
3175 | goto error; | |
5461b305 | 3176 | } |
ca95a216 | 3177 | |
54d01ffb | 3178 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3179 | if (ret < 0) { |
3180 | goto setup_error; | |
3181 | } | |
9f19cc17 | 3182 | |
54d01ffb DG |
3183 | /* Copy event list into message payload */ |
3184 | memcpy(cmd_ctx->llm->payload, events, | |
3185 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3186 | |
54d01ffb | 3187 | free(events); |
9f19cc17 DG |
3188 | |
3189 | ret = LTTCOMM_OK; | |
5461b305 | 3190 | break; |
5e16da05 MD |
3191 | } |
3192 | case LTTNG_LIST_SESSIONS: | |
3193 | { | |
54d01ffb | 3194 | session_lock_list(); |
5461b305 | 3195 | |
6c9cc2ab | 3196 | if (session_list_ptr->count == 0) { |
f3ed775e | 3197 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 3198 | session_unlock_list(); |
5461b305 | 3199 | goto error; |
57167058 | 3200 | } |
5e16da05 | 3201 | |
6c9cc2ab DG |
3202 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
3203 | session_list_ptr->count); | |
5461b305 | 3204 | if (ret < 0) { |
54d01ffb | 3205 | session_unlock_list(); |
5461b305 | 3206 | goto setup_error; |
e065084a | 3207 | } |
5e16da05 | 3208 | |
6c9cc2ab DG |
3209 | /* Filled the session array */ |
3210 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
3211 | ||
54d01ffb | 3212 | session_unlock_list(); |
5e16da05 | 3213 | |
5461b305 | 3214 | ret = LTTCOMM_OK; |
5e16da05 MD |
3215 | break; |
3216 | } | |
d0254c7c MD |
3217 | case LTTNG_CALIBRATE: |
3218 | { | |
54d01ffb DG |
3219 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3220 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3221 | break; |
3222 | } | |
d9800920 DG |
3223 | case LTTNG_REGISTER_CONSUMER: |
3224 | { | |
54d01ffb DG |
3225 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3226 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3227 | break; |
3228 | } | |
5e16da05 | 3229 | default: |
5e16da05 | 3230 | ret = LTTCOMM_UND; |
5461b305 | 3231 | break; |
fac6795d DG |
3232 | } |
3233 | ||
5461b305 | 3234 | error: |
5461b305 DG |
3235 | if (cmd_ctx->llm == NULL) { |
3236 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3237 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3238 | goto setup_error; |
3239 | } | |
3240 | } | |
54d01ffb | 3241 | /* Set return code */ |
5461b305 | 3242 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3243 | setup_error: |
b5541356 | 3244 | if (cmd_ctx->session) { |
54d01ffb | 3245 | session_unlock(cmd_ctx->session); |
b5541356 | 3246 | } |
54d01ffb | 3247 | init_setup_error: |
8028d920 | 3248 | return ret; |
fac6795d DG |
3249 | } |
3250 | ||
1d4b027a | 3251 | /* |
d063d709 DG |
3252 | * This thread manage all clients request using the unix client socket for |
3253 | * communication. | |
1d4b027a DG |
3254 | */ |
3255 | static void *thread_manage_clients(void *data) | |
3256 | { | |
5eb91c98 DG |
3257 | int sock = 0, ret, i, pollfd; |
3258 | uint32_t revents, nb_fd; | |
273ea72c | 3259 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3260 | struct lttng_poll_event events; |
1d4b027a DG |
3261 | |
3262 | DBG("[thread] Manage client started"); | |
3263 | ||
f6a9efaa DG |
3264 | rcu_register_thread(); |
3265 | ||
1d4b027a DG |
3266 | ret = lttcomm_listen_unix_sock(client_sock); |
3267 | if (ret < 0) { | |
3268 | goto error; | |
3269 | } | |
3270 | ||
5eb91c98 DG |
3271 | /* |
3272 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3273 | * more will be added to this poll set. | |
3274 | */ | |
3275 | ret = create_thread_poll_set(&events, 2); | |
3276 | if (ret < 0) { | |
3277 | goto error; | |
3278 | } | |
273ea72c | 3279 | |
5eb91c98 DG |
3280 | /* Add the application registration socket */ |
3281 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3282 | if (ret < 0) { | |
3283 | goto error; | |
3284 | } | |
273ea72c | 3285 | |
bbd973c2 DG |
3286 | /* |
3287 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3288 | */ |
3289 | if (opt_sig_parent) { | |
3290 | kill(ppid, SIGCHLD); | |
3291 | } | |
3292 | ||
3293 | while (1) { | |
1d4b027a | 3294 | DBG("Accepting client command ..."); |
273ea72c | 3295 | |
5eb91c98 DG |
3296 | nb_fd = LTTNG_POLL_GETNB(&events); |
3297 | ||
273ea72c | 3298 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 3299 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3300 | if (ret < 0) { |
273ea72c DG |
3301 | goto error; |
3302 | } | |
3303 | ||
5eb91c98 DG |
3304 | for (i = 0; i < nb_fd; i++) { |
3305 | /* Fetch once the poll data */ | |
3306 | revents = LTTNG_POLL_GETEV(&events, i); | |
3307 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3308 | ||
3309 | /* Thread quit pipe has been closed. Killing thread. */ | |
3310 | ret = check_thread_quit_pipe(pollfd, revents); | |
3311 | if (ret) { | |
3312 | goto error; | |
3313 | } | |
3314 | ||
3315 | /* Event on the registration socket */ | |
3316 | if (pollfd == client_sock) { | |
3317 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3318 | ERR("Client socket poll error"); | |
3319 | goto error; | |
3320 | } | |
3321 | } | |
3322 | } | |
3323 | ||
3324 | DBG("Wait for client response"); | |
3325 | ||
3326 | sock = lttcomm_accept_unix_sock(client_sock); | |
3327 | if (sock < 0) { | |
273ea72c | 3328 | goto error; |
273ea72c DG |
3329 | } |
3330 | ||
5eb91c98 DG |
3331 | /* Allocate context command to process the client request */ |
3332 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
3333 | if (cmd_ctx == NULL) { | |
3334 | perror("malloc cmd_ctx"); | |
1d4b027a | 3335 | goto error; |
5eb91c98 | 3336 | } |
1d4b027a | 3337 | |
5eb91c98 DG |
3338 | /* Allocate data buffer for reception */ |
3339 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
3340 | if (cmd_ctx->lsm == NULL) { | |
3341 | perror("malloc cmd_ctx->lsm"); | |
3342 | goto error; | |
3343 | } | |
1d4b027a | 3344 | |
5eb91c98 DG |
3345 | cmd_ctx->llm = NULL; |
3346 | cmd_ctx->session = NULL; | |
1d4b027a | 3347 | |
5eb91c98 DG |
3348 | /* |
3349 | * Data is received from the lttng client. The struct | |
3350 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3351 | * the client. | |
3352 | */ | |
3353 | DBG("Receiving data from client ..."); | |
3354 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, | |
3355 | sizeof(struct lttcomm_session_msg)); | |
3356 | if (ret <= 0) { | |
3357 | DBG("Nothing recv() from client... continuing"); | |
3358 | close(sock); | |
3359 | free(cmd_ctx); | |
3360 | continue; | |
3361 | } | |
1d4b027a | 3362 | |
5eb91c98 DG |
3363 | // TODO: Validate cmd_ctx including sanity check for |
3364 | // security purpose. | |
f7776ea7 | 3365 | |
f6a9efaa | 3366 | rcu_thread_online(); |
5eb91c98 DG |
3367 | /* |
3368 | * This function dispatch the work to the kernel or userspace tracer | |
3369 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3370 | * informations for the client. The command context struct contains | |
3371 | * everything this function may needs. | |
3372 | */ | |
3373 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3374 | rcu_thread_offline(); |
5eb91c98 | 3375 | if (ret < 0) { |
bbd973c2 | 3376 | /* |
5eb91c98 DG |
3377 | * TODO: Inform client somehow of the fatal error. At |
3378 | * this point, ret < 0 means that a malloc failed | |
3379 | * (ENOMEM). Error detected but still accept command. | |
bbd973c2 | 3380 | */ |
bbd973c2 | 3381 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3382 | continue; |
3383 | } | |
d6e4fca4 | 3384 | |
54d01ffb DG |
3385 | DBG("Sending response (size: %d, retcode: %s)", |
3386 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3387 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3388 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3389 | if (ret < 0) { |
3390 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3391 | } |
1d4b027a | 3392 | |
5eb91c98 DG |
3393 | clean_command_ctx(&cmd_ctx); |
3394 | ||
3395 | /* End of transmission */ | |
273ea72c DG |
3396 | close(sock); |
3397 | } | |
3398 | ||
5eb91c98 DG |
3399 | error: |
3400 | DBG("Client thread dying"); | |
273ea72c | 3401 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3402 | close(client_sock); |
3403 | close(sock); | |
273ea72c | 3404 | |
5eb91c98 | 3405 | lttng_poll_clean(&events); |
a2fb29a5 | 3406 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3407 | |
3408 | rcu_unregister_thread(); | |
1d4b027a DG |
3409 | return NULL; |
3410 | } | |
3411 | ||
3412 | ||
fac6795d DG |
3413 | /* |
3414 | * usage function on stderr | |
3415 | */ | |
3416 | static void usage(void) | |
3417 | { | |
b716ce68 | 3418 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3419 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3420 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3421 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3422 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3423 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
3bd1e081 MD |
3424 | fprintf(stderr, " --ustconsumerd-err-sock PATH Specify path for the UST consumer error socket\n"); |
3425 | fprintf(stderr, " --ustconsumerd-cmd-sock PATH Specify path for the UST consumer command socket\n"); | |
d6f42150 DG |
3426 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3427 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3428 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3429 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3430 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3431 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3432 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
fac6795d DG |
3433 | } |
3434 | ||
3435 | /* | |
3436 | * daemon argument parsing | |
3437 | */ | |
3438 | static int parse_args(int argc, char **argv) | |
3439 | { | |
3440 | int c; | |
3441 | ||
3442 | static struct option long_options[] = { | |
3443 | { "client-sock", 1, 0, 'c' }, | |
3444 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3445 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3446 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
3447 | { "ustconsumerd-cmd-sock", 1, 0, 'D' }, | |
3448 | { "ustconsumerd-err-sock", 1, 0, 'F' }, | |
fac6795d | 3449 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3450 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3451 | { "help", 0, 0, 'h' }, |
3452 | { "group", 1, 0, 'g' }, | |
3453 | { "version", 0, 0, 'V' }, | |
75462a81 | 3454 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3455 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3456 | { "verbose-consumer", 0, 0, 'Z' }, |
fac6795d DG |
3457 | { NULL, 0, 0, 0 } |
3458 | }; | |
3459 | ||
3460 | while (1) { | |
3461 | int option_index = 0; | |
3bd1e081 | 3462 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z", |
54d01ffb | 3463 | long_options, &option_index); |
fac6795d DG |
3464 | if (c == -1) { |
3465 | break; | |
3466 | } | |
3467 | ||
3468 | switch (c) { | |
3469 | case 0: | |
3470 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3471 | if (optarg) { | |
3472 | fprintf(stderr, " with arg %s\n", optarg); | |
3473 | } | |
3474 | break; | |
b716ce68 | 3475 | case 'c': |
fac6795d DG |
3476 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3477 | break; | |
3478 | case 'a': | |
3479 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3480 | break; | |
3481 | case 'd': | |
3482 | opt_daemon = 1; | |
3483 | break; | |
3484 | case 'g': | |
3485 | opt_tracing_group = strdup(optarg); | |
3486 | break; | |
3487 | case 'h': | |
3488 | usage(); | |
3489 | exit(EXIT_FAILURE); | |
3490 | case 'V': | |
3491 | fprintf(stdout, "%s\n", VERSION); | |
3492 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3493 | case 'S': |
3494 | opt_sig_parent = 1; | |
3495 | break; | |
d6f42150 | 3496 | case 'E': |
3bd1e081 | 3497 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3498 | break; |
3499 | case 'C': | |
3bd1e081 MD |
3500 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3501 | break; | |
3502 | case 'F': | |
3503 | snprintf(ustconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3504 | break; | |
3505 | case 'D': | |
3506 | snprintf(ustconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3507 | break; |
75462a81 DG |
3508 | case 'q': |
3509 | opt_quiet = 1; | |
3510 | break; | |
3f9947db | 3511 | case 'v': |
53086306 DG |
3512 | /* Verbose level can increase using multiple -v */ |
3513 | opt_verbose += 1; | |
3f9947db | 3514 | break; |
31f73cc9 | 3515 | case 'Z': |
3bd1e081 | 3516 | opt_verbose_consumer += 1; |
31f73cc9 | 3517 | break; |
fac6795d DG |
3518 | default: |
3519 | /* Unknown option or other error. | |
3520 | * Error is printed by getopt, just return */ | |
3521 | return -1; | |
3522 | } | |
3523 | } | |
3524 | ||
3525 | return 0; | |
3526 | } | |
3527 | ||
3528 | /* | |
d063d709 | 3529 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3530 | * apps_sock - The communication socket for all UST apps. |
3531 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3532 | */ |
cf3af59e | 3533 | static int init_daemon_socket(void) |
fac6795d DG |
3534 | { |
3535 | int ret = 0; | |
3536 | mode_t old_umask; | |
3537 | ||
3538 | old_umask = umask(0); | |
3539 | ||
3540 | /* Create client tool unix socket */ | |
d6f42150 DG |
3541 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3542 | if (client_sock < 0) { | |
3543 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3544 | ret = -1; |
3545 | goto end; | |
3546 | } | |
3547 | ||
3548 | /* File permission MUST be 660 */ | |
3549 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3550 | if (ret < 0) { | |
d6f42150 | 3551 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3552 | perror("chmod"); |
3553 | goto end; | |
3554 | } | |
3555 | ||
3556 | /* Create the application unix socket */ | |
d6f42150 DG |
3557 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3558 | if (apps_sock < 0) { | |
3559 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3560 | ret = -1; |
3561 | goto end; | |
3562 | } | |
3563 | ||
d6f42150 | 3564 | /* File permission MUST be 666 */ |
54d01ffb DG |
3565 | ret = chmod(apps_unix_sock_path, |
3566 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3567 | if (ret < 0) { |
d6f42150 | 3568 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3569 | perror("chmod"); |
3570 | goto end; | |
3571 | } | |
3572 | ||
3573 | end: | |
3574 | umask(old_umask); | |
3575 | return ret; | |
3576 | } | |
3577 | ||
3578 | /* | |
54d01ffb DG |
3579 | * Check if the global socket is available, and if a daemon is answering at the |
3580 | * other side. If yes, error is returned. | |
fac6795d | 3581 | */ |
cf3af59e | 3582 | static int check_existing_daemon(void) |
fac6795d | 3583 | { |
7d8234d9 | 3584 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3585 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3586 | return 0; |
099e26bd | 3587 | } |
54d01ffb | 3588 | |
7d8234d9 | 3589 | /* Is there anybody out there ? */ |
099e26bd | 3590 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3591 | return -EEXIST; |
099e26bd | 3592 | } else { |
7d8234d9 | 3593 | return 0; |
099e26bd | 3594 | } |
fac6795d DG |
3595 | } |
3596 | ||
fac6795d | 3597 | /* |
d063d709 | 3598 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3599 | * |
d063d709 DG |
3600 | * Race window between mkdir and chown is OK because we are going from more |
3601 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 3602 | */ |
d6f42150 | 3603 | static int set_permissions(void) |
fac6795d DG |
3604 | { |
3605 | int ret; | |
996b65c8 | 3606 | gid_t gid; |
fac6795d | 3607 | |
996b65c8 MD |
3608 | gid = allowed_group(); |
3609 | if (gid < 0) { | |
a463f419 DG |
3610 | if (is_root) { |
3611 | WARN("No tracing group detected"); | |
3612 | ret = 0; | |
3613 | } else { | |
3614 | ERR("Missing tracing group. Aborting execution."); | |
3615 | ret = -1; | |
3616 | } | |
fac6795d DG |
3617 | goto end; |
3618 | } | |
3619 | ||
d6f42150 | 3620 | /* Set lttng run dir */ |
996b65c8 | 3621 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
3622 | if (ret < 0) { |
3623 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
3624 | perror("chown"); | |
3625 | } | |
3626 | ||
3627 | /* lttng client socket path */ | |
996b65c8 | 3628 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3629 | if (ret < 0) { |
d6f42150 DG |
3630 | ERR("Unable to set group on %s", client_unix_sock_path); |
3631 | perror("chown"); | |
3632 | } | |
3633 | ||
3bd1e081 MD |
3634 | /* kconsumer error socket path */ |
3635 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 3636 | if (ret < 0) { |
3bd1e081 MD |
3637 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
3638 | perror("chown"); | |
3639 | } | |
3640 | ||
3641 | /* ustconsumer error socket path */ | |
3642 | ret = chown(ustconsumer_data.err_unix_sock_path, 0, gid); | |
3643 | if (ret < 0) { | |
3644 | ERR("Unable to set group on %s", ustconsumer_data.err_unix_sock_path); | |
fac6795d DG |
3645 | perror("chown"); |
3646 | } | |
3647 | ||
d6f42150 | 3648 | DBG("All permissions are set"); |
e07ae692 | 3649 | |
fac6795d DG |
3650 | end: |
3651 | return ret; | |
3652 | } | |
3653 | ||
7a485870 | 3654 | /* |
d063d709 | 3655 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
3656 | */ |
3657 | static int create_kernel_poll_pipe(void) | |
3658 | { | |
3659 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
3660 | } | |
3661 | ||
099e26bd DG |
3662 | /* |
3663 | * Create the application command pipe to wake thread_manage_apps. | |
3664 | */ | |
3665 | static int create_apps_cmd_pipe(void) | |
3666 | { | |
3667 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
3668 | } | |
3669 | ||
d6f42150 | 3670 | /* |
d063d709 | 3671 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
3672 | */ |
3673 | static int create_lttng_rundir(void) | |
3674 | { | |
3675 | int ret; | |
3676 | ||
3677 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
3678 | if (ret < 0) { | |
b1f11e69 DG |
3679 | if (errno != EEXIST) { |
3680 | ERR("Unable to create " LTTNG_RUNDIR); | |
3681 | goto error; | |
3682 | } else { | |
3683 | ret = 0; | |
3684 | } | |
d6f42150 DG |
3685 | } |
3686 | ||
3687 | error: | |
3688 | return ret; | |
3689 | } | |
3690 | ||
3691 | /* | |
d063d709 DG |
3692 | * Setup sockets and directory needed by the kconsumerd communication with the |
3693 | * session daemon. | |
d6f42150 | 3694 | */ |
3bd1e081 | 3695 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
d6f42150 DG |
3696 | { |
3697 | int ret; | |
3bd1e081 MD |
3698 | const char *path = consumer_data->type == LTTNG_CONSUMER_KERNEL ? |
3699 | KCONSUMERD_PATH : USTCONSUMERD_PATH; | |
d6f42150 | 3700 | |
3bd1e081 MD |
3701 | if (strlen(consumer_data->err_unix_sock_path) == 0) { |
3702 | snprintf(consumer_data->err_unix_sock_path, PATH_MAX, | |
3703 | consumer_data->type == LTTNG_CONSUMER_KERNEL ? | |
3704 | KCONSUMERD_ERR_SOCK_PATH : | |
3705 | USTCONSUMERD_ERR_SOCK_PATH); | |
d6f42150 DG |
3706 | } |
3707 | ||
3bd1e081 MD |
3708 | if (strlen(consumer_data->cmd_unix_sock_path) == 0) { |
3709 | snprintf(consumer_data->cmd_unix_sock_path, PATH_MAX, | |
3710 | consumer_data->type == LTTNG_CONSUMER_KERNEL ? | |
3711 | KCONSUMERD_CMD_SOCK_PATH : | |
3712 | USTCONSUMERD_CMD_SOCK_PATH); | |
d6f42150 DG |
3713 | } |
3714 | ||
3bd1e081 | 3715 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
d6f42150 | 3716 | if (ret < 0) { |
6beb2242 | 3717 | if (errno != EEXIST) { |
3bd1e081 | 3718 | ERR("Failed to create %s", path); |
6beb2242 DG |
3719 | goto error; |
3720 | } | |
3721 | ret = 0; | |
d6f42150 DG |
3722 | } |
3723 | ||
3724 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
3725 | consumer_data->err_sock = |
3726 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
3727 | if (consumer_data->err_sock < 0) { | |
3728 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
3729 | ret = -1; |
3730 | goto error; | |
3731 | } | |
3732 | ||
3733 | /* File permission MUST be 660 */ | |
3bd1e081 | 3734 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 3735 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 3736 | if (ret < 0) { |
3bd1e081 | 3737 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
d6f42150 DG |
3738 | perror("chmod"); |
3739 | goto error; | |
3740 | } | |
3741 | ||
3742 | error: | |
3743 | return ret; | |
3744 | } | |
3745 | ||
fac6795d | 3746 | /* |
d063d709 | 3747 | * Signal handler for the daemon |
cf3af59e | 3748 | * |
54d01ffb DG |
3749 | * Simply stop all worker threads, leaving main() return gracefully after |
3750 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3751 | */ |
3752 | static void sighandler(int sig) | |
3753 | { | |
3754 | switch (sig) { | |
cf3af59e MD |
3755 | case SIGPIPE: |
3756 | DBG("SIGPIPE catched"); | |
3757 | return; | |
3758 | case SIGINT: | |
3759 | DBG("SIGINT catched"); | |
3760 | stop_threads(); | |
3761 | break; | |
3762 | case SIGTERM: | |
3763 | DBG("SIGTERM catched"); | |
3764 | stop_threads(); | |
3765 | break; | |
3766 | default: | |
3767 | break; | |
fac6795d | 3768 | } |
fac6795d DG |
3769 | } |
3770 | ||
3771 | /* | |
d063d709 | 3772 | * Setup signal handler for : |
1d4b027a | 3773 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3774 | */ |
1d4b027a | 3775 | static int set_signal_handler(void) |
fac6795d | 3776 | { |
1d4b027a DG |
3777 | int ret = 0; |
3778 | struct sigaction sa; | |
3779 | sigset_t sigset; | |
fac6795d | 3780 | |
1d4b027a DG |
3781 | if ((ret = sigemptyset(&sigset)) < 0) { |
3782 | perror("sigemptyset"); | |
3783 | return ret; | |
3784 | } | |
d6f42150 | 3785 | |
1d4b027a DG |
3786 | sa.sa_handler = sighandler; |
3787 | sa.sa_mask = sigset; | |
3788 | sa.sa_flags = 0; | |
3789 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3790 | perror("sigaction"); | |
3791 | return ret; | |
d6f42150 DG |
3792 | } |
3793 | ||
1d4b027a DG |
3794 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3795 | perror("sigaction"); | |
3796 | return ret; | |
d6f42150 | 3797 | } |
aaf26714 | 3798 | |
1d4b027a DG |
3799 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3800 | perror("sigaction"); | |
3801 | return ret; | |
8c0faa1d DG |
3802 | } |
3803 | ||
1d4b027a DG |
3804 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3805 | ||
3806 | return ret; | |
fac6795d DG |
3807 | } |
3808 | ||
f3ed775e | 3809 | /* |
d063d709 DG |
3810 | * Set open files limit to unlimited. This daemon can open a large number of |
3811 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3812 | */ |
3813 | static void set_ulimit(void) | |
3814 | { | |
3815 | int ret; | |
3816 | struct rlimit lim; | |
3817 | ||
a88df331 | 3818 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3819 | lim.rlim_cur = 65535; |
3820 | lim.rlim_max = 65535; | |
3821 | ||
3822 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3823 | if (ret < 0) { | |
3824 | perror("failed to set open files limit"); | |
3825 | } | |
3826 | } | |
3827 | ||
fac6795d DG |
3828 | /* |
3829 | * main | |
3830 | */ | |
3831 | int main(int argc, char **argv) | |
3832 | { | |
fac6795d DG |
3833 | int ret = 0; |
3834 | void *status; | |
b082db07 | 3835 | const char *home_path; |
fac6795d | 3836 | |
f6a9efaa DG |
3837 | rcu_register_thread(); |
3838 | ||
273ea72c | 3839 | /* Create thread quit pipe */ |
cf3af59e MD |
3840 | if ((ret = init_thread_quit_pipe()) < 0) { |
3841 | goto error; | |
273ea72c DG |
3842 | } |
3843 | ||
fac6795d DG |
3844 | /* Parse arguments */ |
3845 | progname = argv[0]; | |
3846 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3847 | goto error; |
fac6795d DG |
3848 | } |
3849 | ||
3850 | /* Daemonize */ | |
3851 | if (opt_daemon) { | |
53094c05 DG |
3852 | ret = daemon(0, 0); |
3853 | if (ret < 0) { | |
3854 | perror("daemon"); | |
cf3af59e | 3855 | goto error; |
53094c05 | 3856 | } |
fac6795d DG |
3857 | } |
3858 | ||
3859 | /* Check if daemon is UID = 0 */ | |
3860 | is_root = !getuid(); | |
3861 | ||
fac6795d | 3862 | if (is_root) { |
d6f42150 DG |
3863 | ret = create_lttng_rundir(); |
3864 | if (ret < 0) { | |
cf3af59e | 3865 | goto error; |
d6f42150 DG |
3866 | } |
3867 | ||
fac6795d | 3868 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3869 | snprintf(apps_unix_sock_path, PATH_MAX, |
3870 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3871 | } |
3872 | ||
3873 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3874 | snprintf(client_unix_sock_path, PATH_MAX, |
3875 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3876 | } | |
0fdd1e2c DG |
3877 | |
3878 | /* Set global SHM for ust */ | |
3879 | if (strlen(wait_shm_path) == 0) { | |
3880 | snprintf(wait_shm_path, PATH_MAX, | |
3881 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3882 | } | |
fac6795d | 3883 | } else { |
b082db07 DG |
3884 | home_path = get_home_dir(); |
3885 | if (home_path == NULL) { | |
273ea72c DG |
3886 | /* TODO: Add --socket PATH option */ |
3887 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3888 | ret = -EPERM; |
3889 | goto error; | |
b082db07 DG |
3890 | } |
3891 | ||
fac6795d | 3892 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3893 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3894 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3895 | } |
3896 | ||
3897 | /* Set the cli tool unix socket path */ | |
3898 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3899 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3900 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 3901 | } |
0fdd1e2c DG |
3902 | |
3903 | /* Set global SHM for ust */ | |
3904 | if (strlen(wait_shm_path) == 0) { | |
3905 | snprintf(wait_shm_path, PATH_MAX, | |
3906 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
3907 | } | |
fac6795d DG |
3908 | } |
3909 | ||
847177cd DG |
3910 | DBG("Client socket path %s", client_unix_sock_path); |
3911 | DBG("Application socket path %s", apps_unix_sock_path); | |
3912 | ||
273ea72c | 3913 | /* |
7d8234d9 | 3914 | * See if daemon already exist. |
fac6795d | 3915 | */ |
7d8234d9 | 3916 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 3917 | ERR("Already running daemon.\n"); |
273ea72c | 3918 | /* |
cf3af59e MD |
3919 | * We do not goto exit because we must not cleanup() |
3920 | * because a daemon is already running. | |
ab118b20 | 3921 | */ |
cf3af59e | 3922 | goto error; |
a88df331 DG |
3923 | } |
3924 | ||
54d01ffb | 3925 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
3926 | |
3927 | /* | |
3928 | * These actions must be executed as root. We do that *after* setting up | |
3929 | * the sockets path because we MUST make the check for another daemon using | |
3930 | * those paths *before* trying to set the kernel consumer sockets and init | |
3931 | * kernel tracer. | |
3932 | */ | |
3933 | if (is_root) { | |
3bd1e081 MD |
3934 | ret = set_consumer_sockets(&kconsumer_data); |
3935 | if (ret < 0) { | |
3936 | goto exit; | |
3937 | } | |
48842b30 | 3938 | |
3bd1e081 | 3939 | ret = set_consumer_sockets(&ustconsumer_data); |
a88df331 | 3940 | if (ret < 0) { |
cf3af59e | 3941 | goto exit; |
a88df331 | 3942 | } |
a88df331 DG |
3943 | /* Setup kernel tracer */ |
3944 | init_kernel_tracer(); | |
3945 | ||
3946 | /* Set ulimit for open files */ | |
3947 | set_ulimit(); | |
fac6795d DG |
3948 | } |
3949 | ||
cf3af59e MD |
3950 | if ((ret = set_signal_handler()) < 0) { |
3951 | goto exit; | |
fac6795d DG |
3952 | } |
3953 | ||
d6f42150 | 3954 | /* Setup the needed unix socket */ |
cf3af59e MD |
3955 | if ((ret = init_daemon_socket()) < 0) { |
3956 | goto exit; | |
fac6795d DG |
3957 | } |
3958 | ||
3959 | /* Set credentials to socket */ | |
cf3af59e MD |
3960 | if (is_root && ((ret = set_permissions()) < 0)) { |
3961 | goto exit; | |
fac6795d DG |
3962 | } |
3963 | ||
5b8719f5 DG |
3964 | /* Get parent pid if -S, --sig-parent is specified. */ |
3965 | if (opt_sig_parent) { | |
3966 | ppid = getppid(); | |
3967 | } | |
3968 | ||
7a485870 | 3969 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
3970 | if ((ret = create_kernel_poll_pipe()) < 0) { |
3971 | goto exit; | |
7a485870 DG |
3972 | } |
3973 | ||
099e26bd DG |
3974 | /* Setup the thread apps communication pipe. */ |
3975 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
3976 | goto exit; | |
3977 | } | |
3978 | ||
3979 | /* Init UST command queue. */ | |
3980 | cds_wfq_init(&ust_cmd_queue.queue); | |
3981 | ||
f6a9efaa DG |
3982 | /* Init UST app hash table */ |
3983 | ust_app_ht_alloc(); | |
3984 | ||
273ea72c | 3985 | /* |
54d01ffb DG |
3986 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
3987 | * statically declared in session.c | |
273ea72c | 3988 | */ |
54d01ffb | 3989 | session_list_ptr = session_get_list(); |
b5541356 | 3990 | |
5eb91c98 DG |
3991 | /* Set up max poll set size */ |
3992 | lttng_poll_set_max_size(); | |
3993 | ||
cf3af59e | 3994 | /* Create thread to manage the client socket */ |
099e26bd DG |
3995 | ret = pthread_create(&client_thread, NULL, |
3996 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 3997 | if (ret != 0) { |
099e26bd | 3998 | perror("pthread_create clients"); |
cf3af59e MD |
3999 | goto exit_client; |
4000 | } | |
fac6795d | 4001 | |
099e26bd DG |
4002 | /* Create thread to dispatch registration */ |
4003 | ret = pthread_create(&dispatch_thread, NULL, | |
4004 | thread_dispatch_ust_registration, (void *) NULL); | |
4005 | if (ret != 0) { | |
4006 | perror("pthread_create dispatch"); | |
4007 | goto exit_dispatch; | |
4008 | } | |
4009 | ||
4010 | /* Create thread to manage application registration. */ | |
4011 | ret = pthread_create(®_apps_thread, NULL, | |
4012 | thread_registration_apps, (void *) NULL); | |
4013 | if (ret != 0) { | |
4014 | perror("pthread_create registration"); | |
4015 | goto exit_reg_apps; | |
4016 | } | |
4017 | ||
cf3af59e | 4018 | /* Create thread to manage application socket */ |
54d01ffb DG |
4019 | ret = pthread_create(&apps_thread, NULL, |
4020 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4021 | if (ret != 0) { |
099e26bd | 4022 | perror("pthread_create apps"); |
cf3af59e MD |
4023 | goto exit_apps; |
4024 | } | |
fac6795d | 4025 | |
cf3af59e | 4026 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4027 | ret = pthread_create(&kernel_thread, NULL, |
4028 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4029 | if (ret != 0) { |
099e26bd | 4030 | perror("pthread_create kernel"); |
cf3af59e MD |
4031 | goto exit_kernel; |
4032 | } | |
7a485870 | 4033 | |
cf3af59e MD |
4034 | ret = pthread_join(kernel_thread, &status); |
4035 | if (ret != 0) { | |
4036 | perror("pthread_join"); | |
4037 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4038 | } |
4039 | ||
cf3af59e MD |
4040 | exit_kernel: |
4041 | ret = pthread_join(apps_thread, &status); | |
4042 | if (ret != 0) { | |
4043 | perror("pthread_join"); | |
4044 | goto error; /* join error, exit without cleanup */ | |
4045 | } | |
fac6795d | 4046 | |
cf3af59e | 4047 | exit_apps: |
099e26bd DG |
4048 | ret = pthread_join(reg_apps_thread, &status); |
4049 | if (ret != 0) { | |
4050 | perror("pthread_join"); | |
4051 | goto error; /* join error, exit without cleanup */ | |
4052 | } | |
4053 | ||
4054 | exit_reg_apps: | |
4055 | ret = pthread_join(dispatch_thread, &status); | |
4056 | if (ret != 0) { | |
4057 | perror("pthread_join"); | |
4058 | goto error; /* join error, exit without cleanup */ | |
4059 | } | |
4060 | ||
4061 | exit_dispatch: | |
cf3af59e MD |
4062 | ret = pthread_join(client_thread, &status); |
4063 | if (ret != 0) { | |
4064 | perror("pthread_join"); | |
4065 | goto error; /* join error, exit without cleanup */ | |
4066 | } | |
4067 | ||
3bd1e081 | 4068 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4069 | if (ret != 0) { |
3bd1e081 | 4070 | perror("join_consumer"); |
cf3af59e MD |
4071 | goto error; /* join error, exit without cleanup */ |
4072 | } | |
a88df331 | 4073 | |
cf3af59e | 4074 | exit_client: |
a88df331 | 4075 | exit: |
cf3af59e MD |
4076 | /* |
4077 | * cleanup() is called when no other thread is running. | |
4078 | */ | |
f6a9efaa | 4079 | rcu_thread_online(); |
cf3af59e | 4080 | cleanup(); |
f6a9efaa DG |
4081 | rcu_thread_offline(); |
4082 | rcu_unregister_thread(); | |
cf3af59e MD |
4083 | if (!ret) |
4084 | exit(EXIT_SUCCESS); | |
4085 | error: | |
5e16da05 | 4086 | exit(EXIT_FAILURE); |
fac6795d | 4087 | } |