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 DG |
38 | #include <unistd.h> |
39 | ||
1e307fab | 40 | #include <ltt-kconsumerd.h> |
e88129fc | 41 | #include <lttng-sessiond-comm.h> |
1e307fab DG |
42 | #include <lttng/lttng-kconsumerd.h> |
43 | #include <lttngerr.h> | |
fac6795d | 44 | |
54d01ffb | 45 | #include "channel.h" |
5eb91c98 | 46 | #include "compat/poll.h" |
099e26bd | 47 | #include "context.h" |
54d01ffb | 48 | #include "event.h" |
099e26bd | 49 | #include "futex.h" |
20fe2104 | 50 | #include "kernel-ctl.h" |
1e307fab | 51 | #include "ltt-sessiond.h" |
0fdd1e2c | 52 | #include "shm.h" |
56fff090 | 53 | #include "ust-app.h" |
1e307fab | 54 | #include "ust-ctl.h" |
8e68d1c8 | 55 | #include "utils.h" |
0177d773 | 56 | #include "ust-ctl.h" |
fac6795d | 57 | |
75462a81 | 58 | /* Const values */ |
686204ab | 59 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 60 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
61 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
62 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
63 | ||
fac6795d | 64 | /* Variables */ |
1d4b027a | 65 | int opt_verbose; /* Not static for lttngerr.h */ |
31f73cc9 | 66 | int opt_verbose_kconsumerd; /* Not static for lttngerr.h */ |
1d4b027a | 67 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 68 | |
fac6795d DG |
69 | const char *progname; |
70 | const char *opt_tracing_group; | |
5b8719f5 | 71 | static int opt_sig_parent; |
fac6795d DG |
72 | static int opt_daemon; |
73 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a DG |
74 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
75 | static pid_t kconsumerd_pid; | |
099e26bd | 76 | static int dispatch_thread_exit; |
fac6795d | 77 | |
54d01ffb DG |
78 | /* Global application Unix socket path */ |
79 | static char apps_unix_sock_path[PATH_MAX]; | |
80 | /* Global client Unix socket path */ | |
81 | static char client_unix_sock_path[PATH_MAX]; | |
82 | /* kconsumerd error and command Unix socket path */ | |
83 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; | |
84 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; | |
85 | /* global wait shm path for UST */ | |
86 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 87 | |
1d4b027a | 88 | /* Sockets and FDs */ |
d6f42150 DG |
89 | static int client_sock; |
90 | static int apps_sock; | |
91 | static int kconsumerd_err_sock; | |
8c0faa1d | 92 | static int kconsumerd_cmd_sock; |
20fe2104 | 93 | static int kernel_tracer_fd; |
7a485870 | 94 | static int kernel_poll_pipe[2]; |
1d4b027a | 95 | |
273ea72c DG |
96 | /* |
97 | * Quit pipe for all threads. This permits a single cancellation point | |
98 | * for all threads when receiving an event on the pipe. | |
99 | */ | |
100 | static int thread_quit_pipe[2]; | |
101 | ||
099e26bd DG |
102 | /* |
103 | * This pipe is used to inform the thread managing application communication | |
104 | * that a command is queued and ready to be processed. | |
105 | */ | |
106 | static int apps_cmd_pipe[2]; | |
107 | ||
1d4b027a | 108 | /* Pthread, Mutexes and Semaphores */ |
8c0faa1d | 109 | static pthread_t kconsumerd_thread; |
1d4b027a | 110 | static pthread_t apps_thread; |
099e26bd | 111 | static pthread_t reg_apps_thread; |
1d4b027a | 112 | static pthread_t client_thread; |
7a485870 | 113 | static pthread_t kernel_thread; |
099e26bd | 114 | static pthread_t dispatch_thread; |
8c0faa1d DG |
115 | static sem_t kconsumerd_sem; |
116 | ||
5eb91c98 DG |
117 | |
118 | /* Mutex to control kconsumerd pid assignation */ | |
119 | static pthread_mutex_t kconsumerd_pid_mutex; | |
fac6795d | 120 | |
099e26bd DG |
121 | /* |
122 | * UST registration command queue. This queue is tied with a futex and uses a N | |
123 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
124 | * | |
125 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
126 | * this queue and the wait/wake scheme. | |
127 | */ | |
128 | static struct ust_cmd_queue ust_cmd_queue; | |
129 | ||
b5541356 DG |
130 | /* |
131 | * Pointer initialized before thread creation. | |
132 | * | |
133 | * This points to the tracing session list containing the session count and a | |
134 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
135 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 136 | * |
d063d709 | 137 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 138 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
139 | */ |
140 | static struct ltt_session_list *session_list_ptr; | |
141 | ||
5eb91c98 DG |
142 | /* |
143 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
144 | */ | |
145 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
146 | unsigned int size) | |
147 | { | |
148 | int ret; | |
149 | ||
150 | if (events == NULL || size == 0) { | |
151 | ret = -1; | |
152 | goto error; | |
153 | } | |
154 | ||
155 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
156 | if (ret < 0) { | |
157 | goto error; | |
158 | } | |
159 | ||
160 | /* Add quit pipe */ | |
161 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
162 | if (ret < 0) { | |
163 | goto error; | |
164 | } | |
165 | ||
166 | return 0; | |
167 | ||
168 | error: | |
169 | return ret; | |
170 | } | |
171 | ||
172 | /* | |
173 | * Check if the thread quit pipe was triggered. | |
174 | * | |
175 | * Return 1 if it was triggered else 0; | |
176 | */ | |
177 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
178 | { | |
179 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
180 | return 1; | |
181 | } | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
0fdd1e2c DG |
186 | /* |
187 | * Remove modules in reverse load order. | |
188 | */ | |
189 | static int modprobe_remove_kernel_modules(void) | |
190 | { | |
191 | int ret = 0, i; | |
192 | char modprobe[256]; | |
193 | ||
194 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
195 | ret = snprintf(modprobe, sizeof(modprobe), | |
196 | "/sbin/modprobe --remove --quiet %s", | |
197 | kernel_modules_list[i].name); | |
198 | if (ret < 0) { | |
199 | perror("snprintf modprobe --remove"); | |
200 | goto error; | |
201 | } | |
202 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
203 | ret = system(modprobe); | |
204 | if (ret == -1) { | |
205 | ERR("Unable to launch modprobe --remove for module %s", | |
206 | kernel_modules_list[i].name); | |
207 | } else if (kernel_modules_list[i].required | |
208 | && WEXITSTATUS(ret) != 0) { | |
209 | ERR("Unable to remove module %s", | |
210 | kernel_modules_list[i].name); | |
211 | } else { | |
212 | DBG("Modprobe removal successful %s", | |
213 | kernel_modules_list[i].name); | |
214 | } | |
215 | } | |
216 | ||
217 | error: | |
218 | return ret; | |
219 | } | |
220 | ||
221 | /* | |
222 | * Return group ID of the tracing group or -1 if not found. | |
223 | */ | |
996b65c8 MD |
224 | static gid_t allowed_group(void) |
225 | { | |
226 | struct group *grp; | |
227 | ||
274e143b MD |
228 | if (opt_tracing_group) { |
229 | grp = getgrnam(opt_tracing_group); | |
230 | } else { | |
231 | grp = getgrnam(default_tracing_group); | |
232 | } | |
996b65c8 MD |
233 | if (!grp) { |
234 | return -1; | |
235 | } else { | |
236 | return grp->gr_gid; | |
237 | } | |
238 | } | |
239 | ||
273ea72c | 240 | /* |
5eb91c98 | 241 | * Init thread quit pipe. |
273ea72c DG |
242 | * |
243 | * Return -1 on error or 0 if all pipes are created. | |
244 | */ | |
245 | static int init_thread_quit_pipe(void) | |
246 | { | |
247 | int ret; | |
248 | ||
249 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
250 | if (ret < 0) { | |
251 | perror("thread quit pipe"); | |
252 | goto error; | |
253 | } | |
254 | ||
255 | error: | |
256 | return ret; | |
257 | } | |
258 | ||
fac6795d | 259 | /* |
d063d709 DG |
260 | * Complete teardown of a kernel session. This free all data structure related |
261 | * to a kernel session and update counter. | |
fac6795d | 262 | */ |
1d4b027a | 263 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 264 | { |
1d4b027a DG |
265 | if (session->kernel_session != NULL) { |
266 | DBG("Tearing down kernel session"); | |
d9800920 DG |
267 | |
268 | /* | |
269 | * If a custom kernel consumer was registered, close the socket before | |
270 | * tearing down the complete kernel session structure | |
271 | */ | |
272 | if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) { | |
273 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
274 | } | |
275 | ||
62499ad6 | 276 | trace_kernel_destroy_session(session->kernel_session); |
1d4b027a DG |
277 | /* Extra precaution */ |
278 | session->kernel_session = NULL; | |
fac6795d | 279 | } |
fac6795d DG |
280 | } |
281 | ||
099e26bd DG |
282 | /* |
283 | * Stop all threads by closing the thread quit pipe. | |
284 | */ | |
cf3af59e MD |
285 | static void stop_threads(void) |
286 | { | |
5eb91c98 DG |
287 | int ret; |
288 | ||
cf3af59e MD |
289 | /* Stopping all threads */ |
290 | DBG("Terminating all threads"); | |
54d01ffb | 291 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
292 | if (ret < 0) { |
293 | ERR("write error on thread quit pipe"); | |
294 | } | |
295 | ||
099e26bd DG |
296 | /* Dispatch thread */ |
297 | dispatch_thread_exit = 1; | |
298 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
299 | } |
300 | ||
fac6795d | 301 | /* |
d063d709 | 302 | * Cleanup the daemon |
fac6795d | 303 | */ |
cf3af59e | 304 | static void cleanup(void) |
fac6795d | 305 | { |
1d4b027a DG |
306 | int ret; |
307 | char *cmd; | |
af9737e9 | 308 | struct ltt_session *sess, *stmp; |
fac6795d | 309 | |
1d4b027a | 310 | DBG("Cleaning up"); |
e07ae692 | 311 | |
1d4b027a | 312 | /* <fun> */ |
2f50c8a3 | 313 | MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" |
273ea72c DG |
314 | "Matthew, BEET driven development works!%c[%dm", |
315 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
1d4b027a | 316 | /* </fun> */ |
fac6795d | 317 | |
5eb91c98 DG |
318 | if (is_root) { |
319 | DBG("Removing %s directory", LTTNG_RUNDIR); | |
320 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
321 | if (ret < 0) { | |
322 | ERR("asprintf failed. Something is really wrong!"); | |
323 | } | |
5461b305 | 324 | |
5eb91c98 DG |
325 | /* Remove lttng run directory */ |
326 | ret = system(cmd); | |
327 | if (ret < 0) { | |
328 | ERR("Unable to clean " LTTNG_RUNDIR); | |
329 | } | |
1d4b027a | 330 | } |
5461b305 | 331 | |
1d4b027a | 332 | DBG("Cleaning up all session"); |
fac6795d | 333 | |
b5541356 | 334 | /* Destroy session list mutex */ |
273ea72c DG |
335 | if (session_list_ptr != NULL) { |
336 | pthread_mutex_destroy(&session_list_ptr->lock); | |
337 | ||
338 | /* Cleanup ALL session */ | |
54d01ffb DG |
339 | cds_list_for_each_entry_safe(sess, stmp, |
340 | &session_list_ptr->head, list) { | |
273ea72c DG |
341 | teardown_kernel_session(sess); |
342 | // TODO complete session cleanup (including UST) | |
343 | } | |
344 | } | |
345 | ||
099e26bd | 346 | DBG("Closing all UST sockets"); |
56fff090 | 347 | ust_app_clean_list(); |
099e26bd | 348 | |
273ea72c | 349 | pthread_mutex_destroy(&kconsumerd_pid_mutex); |
b5541356 | 350 | |
f3ed775e | 351 | DBG("Closing kernel fd"); |
1d4b027a | 352 | close(kernel_tracer_fd); |
ab147185 | 353 | |
2f50c8a3 DG |
354 | if (is_root) { |
355 | DBG("Unloading kernel modules"); | |
356 | modprobe_remove_kernel_modules(); | |
357 | } | |
5eb91c98 DG |
358 | |
359 | close(thread_quit_pipe[0]); | |
360 | close(thread_quit_pipe[1]); | |
fac6795d DG |
361 | } |
362 | ||
e065084a | 363 | /* |
d063d709 | 364 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 365 | * |
d063d709 | 366 | * Return lttcomm error code. |
e065084a DG |
367 | */ |
368 | static int send_unix_sock(int sock, void *buf, size_t len) | |
369 | { | |
370 | /* Check valid length */ | |
371 | if (len <= 0) { | |
372 | return -1; | |
373 | } | |
374 | ||
375 | return lttcomm_send_unix_sock(sock, buf, len); | |
376 | } | |
377 | ||
5461b305 | 378 | /* |
d063d709 | 379 | * Free memory of a command context structure. |
5461b305 | 380 | */ |
a2fb29a5 | 381 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 382 | { |
a2fb29a5 DG |
383 | DBG("Clean command context structure"); |
384 | if (*cmd_ctx) { | |
385 | if ((*cmd_ctx)->llm) { | |
386 | free((*cmd_ctx)->llm); | |
5461b305 | 387 | } |
a2fb29a5 DG |
388 | if ((*cmd_ctx)->lsm) { |
389 | free((*cmd_ctx)->lsm); | |
5461b305 | 390 | } |
a2fb29a5 DG |
391 | free(*cmd_ctx); |
392 | *cmd_ctx = NULL; | |
5461b305 DG |
393 | } |
394 | } | |
395 | ||
f3ed775e | 396 | /* |
d063d709 | 397 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 398 | */ |
54d01ffb DG |
399 | static int send_kconsumerd_channel_fds(int sock, |
400 | struct ltt_kernel_channel *channel) | |
f3ed775e DG |
401 | { |
402 | int ret; | |
403 | size_t nb_fd; | |
404 | struct ltt_kernel_stream *stream; | |
f3ed775e DG |
405 | struct lttcomm_kconsumerd_header lkh; |
406 | struct lttcomm_kconsumerd_msg lkm; | |
407 | ||
54d01ffb DG |
408 | DBG("Sending fds of channel %s to kernel consumer", |
409 | channel->channel->name); | |
7a485870 DG |
410 | |
411 | nb_fd = channel->stream_count; | |
f3ed775e DG |
412 | |
413 | /* Setup header */ | |
7a485870 | 414 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
f3ed775e DG |
415 | lkh.cmd_type = ADD_STREAM; |
416 | ||
417 | DBG("Sending kconsumerd header"); | |
418 | ||
54d01ffb DG |
419 | ret = lttcomm_send_unix_sock(sock, &lkh, |
420 | sizeof(struct lttcomm_kconsumerd_header)); | |
f3ed775e DG |
421 | if (ret < 0) { |
422 | perror("send kconsumerd header"); | |
423 | goto error; | |
424 | } | |
425 | ||
7a485870 DG |
426 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
427 | if (stream->fd != 0) { | |
f3ed775e DG |
428 | lkm.fd = stream->fd; |
429 | lkm.state = stream->state; | |
7a485870 | 430 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
e8b60857 | 431 | lkm.output = channel->channel->attr.output; |
f3ed775e | 432 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
99497cd0 | 433 | lkm.path_name[PATH_MAX - 1] = '\0'; |
f3ed775e DG |
434 | |
435 | DBG("Sending fd %d to kconsumerd", lkm.fd); | |
436 | ||
54d01ffb DG |
437 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, |
438 | &lkm.fd, 1, sizeof(lkm)); | |
f3ed775e DG |
439 | if (ret < 0) { |
440 | perror("send kconsumerd fd"); | |
441 | goto error; | |
442 | } | |
443 | } | |
444 | } | |
445 | ||
7a485870 | 446 | DBG("Kconsumerd channel fds sent"); |
f3ed775e DG |
447 | |
448 | return 0; | |
449 | ||
450 | error: | |
451 | return ret; | |
452 | } | |
453 | ||
454 | /* | |
d063d709 | 455 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 456 | */ |
d9800920 | 457 | static int send_kconsumerd_fds(struct ltt_kernel_session *session) |
f3ed775e DG |
458 | { |
459 | int ret; | |
460 | struct ltt_kernel_channel *chan; | |
7a485870 DG |
461 | struct lttcomm_kconsumerd_header lkh; |
462 | struct lttcomm_kconsumerd_msg lkm; | |
463 | ||
464 | /* Setup header */ | |
465 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); | |
466 | lkh.cmd_type = ADD_STREAM; | |
467 | ||
468 | DBG("Sending kconsumerd header for metadata"); | |
469 | ||
54d01ffb DG |
470 | ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh, |
471 | sizeof(struct lttcomm_kconsumerd_header)); | |
7a485870 DG |
472 | if (ret < 0) { |
473 | perror("send kconsumerd header"); | |
474 | goto error; | |
475 | } | |
476 | ||
477 | DBG("Sending metadata stream fd"); | |
478 | ||
d9800920 DG |
479 | /* Extra protection. It's NOT suppose to be set to 0 at this point */ |
480 | if (session->consumer_fd == 0) { | |
481 | session->consumer_fd = kconsumerd_cmd_sock; | |
482 | } | |
483 | ||
7a485870 DG |
484 | if (session->metadata_stream_fd != 0) { |
485 | /* Send metadata stream fd first */ | |
486 | lkm.fd = session->metadata_stream_fd; | |
487 | lkm.state = ACTIVE_FD; | |
488 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
8b270bdb | 489 | lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
7a485870 | 490 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); |
99497cd0 | 491 | lkm.path_name[PATH_MAX - 1] = '\0'; |
7a485870 | 492 | |
54d01ffb DG |
493 | ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm, |
494 | &lkm.fd, 1, sizeof(lkm)); | |
7a485870 DG |
495 | if (ret < 0) { |
496 | perror("send kconsumerd fd"); | |
497 | goto error; | |
498 | } | |
499 | } | |
f3ed775e | 500 | |
f3ed775e | 501 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
d9800920 | 502 | ret = send_kconsumerd_channel_fds(session->consumer_fd, chan); |
f3ed775e | 503 | if (ret < 0) { |
7a485870 | 504 | goto error; |
f3ed775e DG |
505 | } |
506 | } | |
507 | ||
7a485870 DG |
508 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
509 | ||
f3ed775e DG |
510 | return 0; |
511 | ||
512 | error: | |
513 | return ret; | |
514 | } | |
515 | ||
fac6795d | 516 | /* |
0fdd1e2c | 517 | * Notify UST applications using the shm mmap futex. |
fac6795d | 518 | */ |
0fdd1e2c | 519 | static int notify_ust_apps(int active) |
fac6795d | 520 | { |
0fdd1e2c | 521 | char *wait_shm_mmap; |
fac6795d | 522 | |
0fdd1e2c | 523 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 524 | |
0fdd1e2c DG |
525 | /* See shm.c for this call implying mmap, shm and futex calls */ |
526 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
527 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
528 | goto error; |
529 | } | |
530 | ||
0fdd1e2c DG |
531 | /* Wake waiting process */ |
532 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
533 | ||
534 | /* Apps notified successfully */ | |
535 | return 0; | |
fac6795d DG |
536 | |
537 | error: | |
0fdd1e2c | 538 | return -1; |
fac6795d DG |
539 | } |
540 | ||
e065084a | 541 | /* |
d063d709 DG |
542 | * Setup the outgoing data buffer for the response (llm) by allocating the |
543 | * right amount of memory and copying the original information from the lsm | |
544 | * structure. | |
ca95a216 | 545 | * |
d063d709 | 546 | * Return total size of the buffer pointed by buf. |
ca95a216 | 547 | */ |
5461b305 | 548 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 549 | { |
f3ed775e | 550 | int ret, buf_size; |
ca95a216 | 551 | |
f3ed775e | 552 | buf_size = size; |
5461b305 DG |
553 | |
554 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
555 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 556 | perror("malloc"); |
5461b305 | 557 | ret = -ENOMEM; |
ca95a216 DG |
558 | goto error; |
559 | } | |
560 | ||
5461b305 DG |
561 | /* Copy common data */ |
562 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 563 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 564 | |
5461b305 DG |
565 | cmd_ctx->llm->data_size = size; |
566 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
567 | ||
ca95a216 DG |
568 | return buf_size; |
569 | ||
570 | error: | |
571 | return ret; | |
572 | } | |
573 | ||
7a485870 | 574 | /* |
5eb91c98 | 575 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 576 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 577 | */ |
5eb91c98 | 578 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 579 | { |
5eb91c98 | 580 | int ret; |
7a485870 DG |
581 | struct ltt_session *session; |
582 | struct ltt_kernel_channel *channel; | |
583 | ||
5eb91c98 | 584 | DBG("Updating kernel poll set"); |
7a485870 | 585 | |
54d01ffb | 586 | session_lock_list(); |
b5541356 | 587 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 588 | session_lock(session); |
7a485870 | 589 | if (session->kernel_session == NULL) { |
54d01ffb | 590 | session_unlock(session); |
7a485870 DG |
591 | continue; |
592 | } | |
7a485870 | 593 | |
54d01ffb DG |
594 | cds_list_for_each_entry(channel, |
595 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
596 | /* Add channel fd to the kernel poll set */ |
597 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
598 | if (ret < 0) { | |
54d01ffb | 599 | session_unlock(session); |
5eb91c98 DG |
600 | goto error; |
601 | } | |
602 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 603 | } |
54d01ffb | 604 | session_unlock(session); |
7a485870 | 605 | } |
54d01ffb | 606 | session_unlock_list(); |
7a485870 | 607 | |
5eb91c98 | 608 | return 0; |
7a485870 DG |
609 | |
610 | error: | |
54d01ffb | 611 | session_unlock_list(); |
7a485870 DG |
612 | return -1; |
613 | } | |
614 | ||
615 | /* | |
54d01ffb | 616 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 617 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 618 | * |
d063d709 | 619 | * Useful for CPU hotplug feature. |
7a485870 DG |
620 | */ |
621 | static int update_kernel_stream(int fd) | |
622 | { | |
623 | int ret = 0; | |
624 | struct ltt_session *session; | |
625 | struct ltt_kernel_channel *channel; | |
626 | ||
627 | DBG("Updating kernel streams for channel fd %d", fd); | |
628 | ||
54d01ffb | 629 | session_lock_list(); |
b5541356 | 630 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 631 | session_lock(session); |
7a485870 | 632 | if (session->kernel_session == NULL) { |
54d01ffb | 633 | session_unlock(session); |
7a485870 DG |
634 | continue; |
635 | } | |
d9800920 DG |
636 | |
637 | /* This is not suppose to be 0 but this is an extra security check */ | |
638 | if (session->kernel_session->consumer_fd == 0) { | |
639 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
640 | } | |
641 | ||
5eb91c98 DG |
642 | cds_list_for_each_entry(channel, |
643 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
644 | if (channel->fd == fd) { |
645 | DBG("Channel found, updating kernel streams"); | |
646 | ret = kernel_open_channel_stream(channel); | |
647 | if (ret < 0) { | |
b3c750d2 | 648 | goto error; |
7a485870 | 649 | } |
d9800920 | 650 | |
7a485870 | 651 | /* |
5eb91c98 DG |
652 | * Have we already sent fds to the consumer? If yes, it means |
653 | * that tracing is started so it is safe to send our updated | |
654 | * stream fds. | |
7a485870 DG |
655 | */ |
656 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
5eb91c98 DG |
657 | ret = send_kconsumerd_channel_fds( |
658 | session->kernel_session->consumer_fd, channel); | |
7a485870 | 659 | if (ret < 0) { |
b3c750d2 | 660 | goto error; |
7a485870 DG |
661 | } |
662 | } | |
b3c750d2 | 663 | goto error; |
7a485870 DG |
664 | } |
665 | } | |
54d01ffb | 666 | session_unlock(session); |
7a485870 | 667 | } |
54d01ffb | 668 | session_unlock_list(); |
b3c750d2 | 669 | return ret; |
7a485870 | 670 | |
b3c750d2 | 671 | error: |
54d01ffb DG |
672 | session_unlock(session); |
673 | session_unlock_list(); | |
7a485870 DG |
674 | return ret; |
675 | } | |
676 | ||
677 | /* | |
d063d709 | 678 | * This thread manage event coming from the kernel. |
7a485870 | 679 | * |
d063d709 DG |
680 | * Features supported in this thread: |
681 | * -) CPU Hotplug | |
7a485870 DG |
682 | */ |
683 | static void *thread_manage_kernel(void *data) | |
684 | { | |
5eb91c98 DG |
685 | int ret, i, pollfd, update_poll_flag = 1; |
686 | uint32_t revents, nb_fd; | |
7a485870 | 687 | char tmp; |
5eb91c98 | 688 | struct lttng_poll_event events; |
7a485870 DG |
689 | |
690 | DBG("Thread manage kernel started"); | |
691 | ||
5eb91c98 DG |
692 | ret = create_thread_poll_set(&events, 2); |
693 | if (ret < 0) { | |
694 | goto error; | |
695 | } | |
696 | ||
697 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
698 | if (ret < 0) { | |
699 | goto error; | |
700 | } | |
701 | ||
7a485870 DG |
702 | while (1) { |
703 | if (update_poll_flag == 1) { | |
5f822d0a DG |
704 | /* |
705 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
706 | * quit pipe and the kernel pipe. | |
707 | */ | |
708 | events.nb_fd = 2; | |
709 | ||
5eb91c98 DG |
710 | ret = update_kernel_poll(&events); |
711 | if (ret < 0) { | |
7a485870 DG |
712 | goto error; |
713 | } | |
714 | update_poll_flag = 0; | |
715 | } | |
716 | ||
5eb91c98 DG |
717 | nb_fd = LTTNG_POLL_GETNB(&events); |
718 | ||
719 | DBG("Thread kernel polling on %d fds", nb_fd); | |
720 | ||
721 | /* Zeroed the poll events */ | |
722 | lttng_poll_reset(&events); | |
7a485870 DG |
723 | |
724 | /* Poll infinite value of time */ | |
5eb91c98 | 725 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 726 | if (ret < 0) { |
7a485870 DG |
727 | goto error; |
728 | } else if (ret == 0) { | |
729 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
730 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
731 | "This should not have happened! Continuing..."); | |
7a485870 DG |
732 | continue; |
733 | } | |
734 | ||
5eb91c98 DG |
735 | for (i = 0; i < nb_fd; i++) { |
736 | /* Fetch once the poll data */ | |
737 | revents = LTTNG_POLL_GETEV(&events, i); | |
738 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 739 | |
5eb91c98 DG |
740 | /* Thread quit pipe has been closed. Killing thread. */ |
741 | ret = check_thread_quit_pipe(pollfd, revents); | |
742 | if (ret) { | |
743 | goto error; | |
744 | } | |
7a485870 | 745 | |
5eb91c98 DG |
746 | /* Check for data on kernel pipe */ |
747 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
748 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
749 | update_poll_flag = 1; | |
750 | continue; | |
751 | } else { | |
752 | /* | |
753 | * New CPU detected by the kernel. Adding kernel stream to | |
754 | * kernel session and updating the kernel consumer | |
755 | */ | |
756 | if (revents & LPOLLIN) { | |
757 | ret = update_kernel_stream(pollfd); | |
758 | if (ret < 0) { | |
759 | continue; | |
760 | } | |
761 | break; | |
762 | /* | |
763 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
764 | * and unregister kernel stream at this point. | |
765 | */ | |
7a485870 | 766 | } |
7a485870 DG |
767 | } |
768 | } | |
769 | } | |
770 | ||
771 | error: | |
772 | DBG("Kernel thread dying"); | |
273ea72c DG |
773 | close(kernel_poll_pipe[0]); |
774 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
775 | |
776 | lttng_poll_clean(&events); | |
777 | ||
7a485870 DG |
778 | return NULL; |
779 | } | |
780 | ||
1d4b027a | 781 | /* |
d063d709 | 782 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
783 | */ |
784 | static void *thread_manage_kconsumerd(void *data) | |
785 | { | |
5eb91c98 DG |
786 | int sock = 0, i, ret, pollfd; |
787 | uint32_t revents, nb_fd; | |
1d4b027a | 788 | enum lttcomm_return_code code; |
5eb91c98 | 789 | struct lttng_poll_event events; |
1d4b027a DG |
790 | |
791 | DBG("[thread] Manage kconsumerd started"); | |
792 | ||
793 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
794 | if (ret < 0) { | |
795 | goto error; | |
796 | } | |
797 | ||
5eb91c98 DG |
798 | /* |
799 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
800 | * Nothing more will be added to this poll set. | |
801 | */ | |
802 | ret = create_thread_poll_set(&events, 2); | |
803 | if (ret < 0) { | |
804 | goto error; | |
805 | } | |
273ea72c | 806 | |
5eb91c98 DG |
807 | ret = lttng_poll_add(&events, kconsumerd_err_sock, LPOLLIN | LPOLLRDHUP); |
808 | if (ret < 0) { | |
809 | goto error; | |
810 | } | |
811 | ||
812 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
813 | |
814 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 815 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 816 | if (ret < 0) { |
273ea72c DG |
817 | goto error; |
818 | } | |
819 | ||
5eb91c98 DG |
820 | for (i = 0; i < nb_fd; i++) { |
821 | /* Fetch once the poll data */ | |
822 | revents = LTTNG_POLL_GETEV(&events, i); | |
823 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
824 | ||
825 | /* Thread quit pipe has been closed. Killing thread. */ | |
826 | ret = check_thread_quit_pipe(pollfd, revents); | |
827 | if (ret) { | |
828 | goto error; | |
829 | } | |
830 | ||
831 | /* Event on the registration socket */ | |
832 | if (pollfd == kconsumerd_err_sock) { | |
833 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
834 | ERR("Kconsumerd err socket poll error"); | |
835 | goto error; | |
836 | } | |
837 | } | |
273ea72c DG |
838 | } |
839 | ||
1d4b027a DG |
840 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
841 | if (sock < 0) { | |
842 | goto error; | |
843 | } | |
844 | ||
712ea556 | 845 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
846 | ret = lttcomm_recv_unix_sock(sock, &code, |
847 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
848 | if (ret <= 0) { |
849 | goto error; | |
850 | } | |
851 | ||
852 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
54d01ffb DG |
853 | kconsumerd_cmd_sock = |
854 | lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
1d4b027a | 855 | if (kconsumerd_cmd_sock < 0) { |
712ea556 | 856 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
857 | perror("kconsumerd connect"); |
858 | goto error; | |
859 | } | |
860 | /* Signal condition to tell that the kconsumerd is ready */ | |
861 | sem_post(&kconsumerd_sem); | |
862 | DBG("Kconsumerd command socket ready"); | |
863 | } else { | |
6f61d021 | 864 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
865 | lttcomm_get_readable_code(-code)); |
866 | goto error; | |
867 | } | |
868 | ||
54d01ffb | 869 | /* Remove the kconsumerd error sock since we've established a connexion */ |
5eb91c98 | 870 | ret = lttng_poll_del(&events, kconsumerd_err_sock); |
72079cae | 871 | if (ret < 0) { |
72079cae DG |
872 | goto error; |
873 | } | |
874 | ||
5eb91c98 DG |
875 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
876 | if (ret < 0) { | |
72079cae | 877 | goto error; |
5eb91c98 DG |
878 | } |
879 | ||
880 | /* Update number of fd */ | |
881 | nb_fd = LTTNG_POLL_GETNB(&events); | |
882 | ||
883 | /* Inifinite blocking call, waiting for transmission */ | |
884 | ret = lttng_poll_wait(&events, -1); | |
885 | if (ret < 0) { | |
72079cae DG |
886 | goto error; |
887 | } | |
888 | ||
5eb91c98 DG |
889 | for (i = 0; i < nb_fd; i++) { |
890 | /* Fetch once the poll data */ | |
891 | revents = LTTNG_POLL_GETEV(&events, i); | |
892 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
893 | ||
894 | /* Thread quit pipe has been closed. Killing thread. */ | |
895 | ret = check_thread_quit_pipe(pollfd, revents); | |
896 | if (ret) { | |
897 | goto error; | |
898 | } | |
899 | ||
900 | /* Event on the kconsumerd socket */ | |
901 | if (pollfd == sock) { | |
902 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
903 | ERR("Kconsumerd err socket second poll error"); | |
904 | goto error; | |
905 | } | |
906 | } | |
907 | } | |
908 | ||
712ea556 | 909 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
910 | ret = lttcomm_recv_unix_sock(sock, &code, |
911 | sizeof(enum lttcomm_return_code)); | |
712ea556 DG |
912 | if (ret <= 0) { |
913 | ERR("Kconsumerd closed the command socket"); | |
914 | goto error; | |
6f61d021 | 915 | } |
1d4b027a | 916 | |
712ea556 DG |
917 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
918 | ||
1d4b027a | 919 | error: |
6f61d021 | 920 | DBG("Kconsumerd thread dying"); |
5eb91c98 DG |
921 | close(kconsumerd_err_sock); |
922 | close(kconsumerd_cmd_sock); | |
923 | close(sock); | |
273ea72c DG |
924 | |
925 | unlink(kconsumerd_err_unix_sock_path); | |
926 | unlink(kconsumerd_cmd_unix_sock_path); | |
273ea72c | 927 | kconsumerd_pid = 0; |
1d4b027a | 928 | |
5eb91c98 | 929 | lttng_poll_clean(&events); |
0177d773 | 930 | |
5eb91c98 | 931 | return NULL; |
099e26bd DG |
932 | } |
933 | ||
099e26bd DG |
934 | /* |
935 | * This thread manage application communication. | |
1d4b027a DG |
936 | */ |
937 | static void *thread_manage_apps(void *data) | |
099e26bd | 938 | { |
5eb91c98 DG |
939 | int i, ret, pollfd; |
940 | uint32_t revents, nb_fd; | |
099e26bd | 941 | struct ust_command ust_cmd; |
5eb91c98 | 942 | struct lttng_poll_event events; |
099e26bd DG |
943 | |
944 | DBG("[thread] Manage application started"); | |
945 | ||
5eb91c98 DG |
946 | ret = create_thread_poll_set(&events, 2); |
947 | if (ret < 0) { | |
948 | goto error; | |
949 | } | |
099e26bd | 950 | |
5eb91c98 DG |
951 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
952 | if (ret < 0) { | |
953 | goto error; | |
954 | } | |
099e26bd | 955 | |
5eb91c98 DG |
956 | while (1) { |
957 | /* Zeroed the events structure */ | |
958 | lttng_poll_reset(&events); | |
0177d773 | 959 | |
5eb91c98 | 960 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
961 | |
962 | DBG("Apps thread polling on %d fds", nb_fd); | |
963 | ||
964 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 965 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 966 | if (ret < 0) { |
099e26bd DG |
967 | goto error; |
968 | } | |
969 | ||
5eb91c98 DG |
970 | for (i = 0; i < nb_fd; i++) { |
971 | /* Fetch once the poll data */ | |
972 | revents = LTTNG_POLL_GETEV(&events, i); | |
973 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
974 | ||
975 | /* Thread quit pipe has been closed. Killing thread. */ | |
976 | ret = check_thread_quit_pipe(pollfd, revents); | |
977 | if (ret) { | |
099e26bd | 978 | goto error; |
5eb91c98 | 979 | } |
099e26bd | 980 | |
5eb91c98 DG |
981 | /* Inspect the apps cmd pipe */ |
982 | if (pollfd == apps_cmd_pipe[0]) { | |
983 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
984 | ERR("Apps command pipe error"); | |
0177d773 | 985 | goto error; |
5eb91c98 DG |
986 | } else if (revents & LPOLLIN) { |
987 | /* Empty pipe */ | |
988 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
989 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
990 | perror("read apps cmd pipe"); | |
991 | goto error; | |
992 | } | |
099e26bd | 993 | |
5eb91c98 | 994 | /* Register applicaton to the session daemon */ |
56fff090 | 995 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 996 | ust_cmd.sock); |
5eb91c98 DG |
997 | if (ret < 0) { |
998 | /* Only critical ENOMEM error can be returned here */ | |
999 | goto error; | |
1000 | } | |
1001 | ||
1002 | ret = ustctl_register_done(ust_cmd.sock); | |
1003 | if (ret < 0) { | |
1004 | /* | |
1005 | * If the registration is not possible, we simply | |
1006 | * unregister the apps and continue | |
1007 | */ | |
56fff090 | 1008 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1009 | } else { |
1010 | /* | |
1011 | * We just need here to monitor the close of the UST | |
1012 | * socket and poll set monitor those by default. | |
1013 | */ | |
1014 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1015 | if (ret < 0) { | |
1016 | goto error; | |
1017 | } | |
1018 | ||
54d01ffb DG |
1019 | DBG("Apps with sock %d added to poll set", |
1020 | ust_cmd.sock); | |
5eb91c98 DG |
1021 | } |
1022 | break; | |
0177d773 | 1023 | } |
5eb91c98 DG |
1024 | } else { |
1025 | /* | |
54d01ffb DG |
1026 | * At this point, we know that a registered application made |
1027 | * the event at poll_wait. | |
5eb91c98 DG |
1028 | */ |
1029 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1030 | /* Removing from the poll set */ | |
1031 | ret = lttng_poll_del(&events, pollfd); | |
1032 | if (ret < 0) { | |
1033 | goto error; | |
1034 | } | |
099e26bd | 1035 | |
5eb91c98 | 1036 | /* Socket closed */ |
56fff090 | 1037 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1038 | break; |
1039 | } | |
099e26bd DG |
1040 | } |
1041 | } | |
099e26bd DG |
1042 | } |
1043 | ||
1044 | error: | |
1045 | DBG("Application communication apps dying"); | |
1046 | close(apps_cmd_pipe[0]); | |
1047 | close(apps_cmd_pipe[1]); | |
1048 | ||
5eb91c98 | 1049 | lttng_poll_clean(&events); |
099e26bd DG |
1050 | |
1051 | return NULL; | |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | * Dispatch request from the registration threads to the application | |
1056 | * communication thread. | |
1057 | */ | |
1058 | static void *thread_dispatch_ust_registration(void *data) | |
1059 | { | |
1060 | int ret; | |
1061 | struct cds_wfq_node *node; | |
1062 | struct ust_command *ust_cmd = NULL; | |
1063 | ||
1064 | DBG("[thread] Dispatch UST command started"); | |
1065 | ||
1066 | while (!dispatch_thread_exit) { | |
1067 | /* Atomically prepare the queue futex */ | |
1068 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1069 | ||
1070 | do { | |
1071 | /* Dequeue command for registration */ | |
1072 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1073 | if (node == NULL) { | |
1074 | DBG("Waked up but nothing in the UST command queue"); | |
1075 | /* Continue thread execution */ | |
1076 | break; | |
1077 | } | |
1078 | ||
1079 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1080 | ||
2f50c8a3 DG |
1081 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1082 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1083 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1084 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1085 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1086 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1087 | /* |
1088 | * Inform apps thread of the new application registration. This | |
1089 | * call is blocking so we can be assured that the data will be read | |
1090 | * at some point in time or wait to the end of the world :) | |
1091 | */ | |
1092 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1093 | sizeof(struct ust_command)); | |
1094 | if (ret < 0) { | |
1095 | perror("write apps cmd pipe"); | |
1096 | if (errno == EBADF) { | |
1097 | /* | |
1098 | * We can't inform the application thread to process | |
1099 | * registration. We will exit or else application | |
1100 | * registration will not occur and tracing will never | |
1101 | * start. | |
1102 | */ | |
1103 | goto error; | |
1104 | } | |
1105 | } | |
1106 | free(ust_cmd); | |
1107 | } while (node != NULL); | |
1108 | ||
1109 | /* Futex wait on queue. Blocking call on futex() */ | |
1110 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1111 | } | |
1112 | ||
1113 | error: | |
1114 | DBG("Dispatch thread dying"); | |
1115 | return NULL; | |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * This thread manage application registration. | |
1120 | */ | |
1121 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1122 | { |
5eb91c98 DG |
1123 | int sock = 0, i, ret, pollfd; |
1124 | uint32_t revents, nb_fd; | |
1125 | struct lttng_poll_event events; | |
099e26bd DG |
1126 | /* |
1127 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1128 | * freed in the manage apps thread. | |
1129 | */ | |
1130 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1131 | |
099e26bd | 1132 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1133 | |
1134 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1135 | if (ret < 0) { | |
1136 | goto error; | |
1137 | } | |
1138 | ||
5eb91c98 DG |
1139 | /* |
1140 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1141 | * more will be added to this poll set. | |
1142 | */ | |
1143 | ret = create_thread_poll_set(&events, 2); | |
1144 | if (ret < 0) { | |
1145 | goto error; | |
1146 | } | |
273ea72c | 1147 | |
5eb91c98 DG |
1148 | /* Add the application registration socket */ |
1149 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1150 | if (ret < 0) { | |
1151 | goto error; | |
1152 | } | |
273ea72c | 1153 | |
1d4b027a | 1154 | /* Notify all applications to register */ |
0fdd1e2c DG |
1155 | ret = notify_ust_apps(1); |
1156 | if (ret < 0) { | |
1157 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1158 | "Execution continues but there might be problem for already\n" |
1159 | "running applications that wishes to register."); | |
0fdd1e2c | 1160 | } |
1d4b027a DG |
1161 | |
1162 | while (1) { | |
1163 | DBG("Accepting application registration"); | |
273ea72c | 1164 | |
5eb91c98 DG |
1165 | nb_fd = LTTNG_POLL_GETNB(&events); |
1166 | ||
273ea72c | 1167 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1168 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1169 | if (ret < 0) { |
273ea72c DG |
1170 | goto error; |
1171 | } | |
1172 | ||
5eb91c98 DG |
1173 | for (i = 0; i < nb_fd; i++) { |
1174 | /* Fetch once the poll data */ | |
1175 | revents = LTTNG_POLL_GETEV(&events, i); | |
1176 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1177 | |
5eb91c98 DG |
1178 | /* Thread quit pipe has been closed. Killing thread. */ |
1179 | ret = check_thread_quit_pipe(pollfd, revents); | |
1180 | if (ret) { | |
90014c57 DG |
1181 | goto error; |
1182 | } | |
1d4b027a | 1183 | |
5eb91c98 DG |
1184 | /* Event on the registration socket */ |
1185 | if (pollfd == apps_sock) { | |
1186 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1187 | ERR("Register apps socket poll error"); | |
1188 | goto error; | |
1189 | } else if (revents & LPOLLIN) { | |
1190 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1191 | if (sock < 0) { | |
1192 | goto error; | |
1193 | } | |
099e26bd | 1194 | |
5eb91c98 DG |
1195 | /* Create UST registration command for enqueuing */ |
1196 | ust_cmd = malloc(sizeof(struct ust_command)); | |
1197 | if (ust_cmd == NULL) { | |
1198 | perror("ust command malloc"); | |
1199 | goto error; | |
1200 | } | |
1d4b027a | 1201 | |
5eb91c98 DG |
1202 | /* |
1203 | * Using message-based transmissions to ensure we don't | |
1204 | * have to deal with partially received messages. | |
1205 | */ | |
1206 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1207 | sizeof(struct ust_register_msg)); | |
1208 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1209 | if (ret < 0) { | |
1210 | perror("lttcomm_recv_unix_sock register apps"); | |
1211 | } else { | |
1212 | ERR("Wrong size received on apps register"); | |
1213 | } | |
1214 | free(ust_cmd); | |
1215 | close(sock); | |
1216 | continue; | |
1217 | } | |
099e26bd | 1218 | |
5eb91c98 | 1219 | ust_cmd->sock = sock; |
099e26bd | 1220 | |
5eb91c98 DG |
1221 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1222 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1223 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1224 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1225 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1226 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1227 | |
5eb91c98 DG |
1228 | /* |
1229 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1230 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1231 | */ |
1232 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1233 | ||
1234 | /* | |
1235 | * Wake the registration queue futex. Implicit memory | |
1236 | * barrier with the exchange in cds_wfq_enqueue. | |
1237 | */ | |
1238 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1239 | } | |
1240 | } | |
90014c57 | 1241 | } |
1d4b027a DG |
1242 | } |
1243 | ||
1244 | error: | |
0fdd1e2c DG |
1245 | DBG("UST Registration thread dying"); |
1246 | ||
1247 | /* Notify that the registration thread is gone */ | |
1248 | notify_ust_apps(0); | |
1249 | ||
1250 | close(apps_sock); | |
1251 | close(sock); | |
273ea72c | 1252 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1253 | |
5eb91c98 DG |
1254 | lttng_poll_clean(&events); |
1255 | ||
1d4b027a DG |
1256 | return NULL; |
1257 | } | |
1258 | ||
8c0faa1d | 1259 | /* |
d063d709 DG |
1260 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
1261 | * exec or it will fails. | |
8c0faa1d | 1262 | */ |
693bd40b | 1263 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
1264 | { |
1265 | int ret; | |
1266 | ||
1267 | /* Setup semaphore */ | |
1268 | sem_init(&kconsumerd_sem, 0, 0); | |
1269 | ||
54d01ffb DG |
1270 | ret = pthread_create(&kconsumerd_thread, NULL, |
1271 | thread_manage_kconsumerd, (void *) NULL); | |
8c0faa1d DG |
1272 | if (ret != 0) { |
1273 | perror("pthread_create kconsumerd"); | |
1274 | goto error; | |
1275 | } | |
1276 | ||
693bd40b | 1277 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
1278 | sem_wait(&kconsumerd_sem); |
1279 | ||
712ea556 DG |
1280 | if (kconsumerd_pid == 0) { |
1281 | ERR("Kconsumerd did not start"); | |
1282 | goto error; | |
1283 | } | |
1284 | ||
8c0faa1d DG |
1285 | return 0; |
1286 | ||
1287 | error: | |
712ea556 | 1288 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
1289 | return ret; |
1290 | } | |
1291 | ||
d9800920 DG |
1292 | /* |
1293 | * Join kernel consumer thread | |
1294 | */ | |
cf3af59e MD |
1295 | static int join_kconsumerd_thread(void) |
1296 | { | |
1297 | void *status; | |
1298 | int ret; | |
1299 | ||
1300 | if (kconsumerd_pid != 0) { | |
1301 | ret = kill(kconsumerd_pid, SIGTERM); | |
1302 | if (ret) { | |
1303 | ERR("Error killing kconsumerd"); | |
1304 | return ret; | |
1305 | } | |
1306 | return pthread_join(kconsumerd_thread, &status); | |
1307 | } else { | |
1308 | return 0; | |
1309 | } | |
1310 | } | |
1311 | ||
8c0faa1d | 1312 | /* |
d063d709 | 1313 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 1314 | * |
d063d709 | 1315 | * Return pid if successful else -1. |
8c0faa1d | 1316 | */ |
693bd40b | 1317 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
1318 | { |
1319 | int ret; | |
1320 | pid_t pid; | |
53086306 | 1321 | const char *verbosity; |
8c0faa1d | 1322 | |
c49dc785 DG |
1323 | DBG("Spawning kconsumerd"); |
1324 | ||
8c0faa1d DG |
1325 | pid = fork(); |
1326 | if (pid == 0) { | |
1327 | /* | |
1328 | * Exec kconsumerd. | |
1329 | */ | |
31f73cc9 | 1330 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
53086306 DG |
1331 | verbosity = "--verbose"; |
1332 | } else { | |
1333 | verbosity = "--quiet"; | |
1334 | } | |
54d01ffb DG |
1335 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", |
1336 | "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
1337 | if (errno != 0) { |
1338 | perror("kernel start consumer exec"); | |
1339 | } | |
1340 | exit(EXIT_FAILURE); | |
1341 | } else if (pid > 0) { | |
1342 | ret = pid; | |
1343 | goto error; | |
1344 | } else { | |
1345 | perror("kernel start consumer fork"); | |
1346 | ret = -errno; | |
1347 | goto error; | |
1348 | } | |
1349 | ||
1350 | error: | |
1351 | return ret; | |
1352 | } | |
1353 | ||
693bd40b | 1354 | /* |
d063d709 | 1355 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
1356 | */ |
1357 | static int start_kconsumerd(void) | |
1358 | { | |
1359 | int ret; | |
1360 | ||
693bd40b | 1361 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 1362 | if (kconsumerd_pid != 0) { |
817153bb | 1363 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
1364 | goto end; |
1365 | } | |
693bd40b | 1366 | |
c49dc785 DG |
1367 | ret = spawn_kconsumerd(); |
1368 | if (ret < 0) { | |
1369 | ERR("Spawning kconsumerd failed"); | |
1370 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1371 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
1372 | goto error; | |
693bd40b | 1373 | } |
c49dc785 DG |
1374 | |
1375 | /* Setting up the global kconsumerd_pid */ | |
1376 | kconsumerd_pid = ret; | |
693bd40b DG |
1377 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
1378 | ||
6f61d021 DG |
1379 | DBG("Kconsumerd pid %d", ret); |
1380 | ||
693bd40b | 1381 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
1382 | ret = spawn_kconsumerd_thread(); |
1383 | if (ret < 0) { | |
1384 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
1385 | goto error; |
1386 | } | |
1387 | ||
c49dc785 | 1388 | end: |
693bd40b DG |
1389 | return 0; |
1390 | ||
1391 | error: | |
1392 | return ret; | |
1393 | } | |
1394 | ||
b73401da | 1395 | /* |
d063d709 | 1396 | * modprobe_kernel_modules |
b73401da DG |
1397 | */ |
1398 | static int modprobe_kernel_modules(void) | |
1399 | { | |
ab147185 | 1400 | int ret = 0, i; |
b73401da DG |
1401 | char modprobe[256]; |
1402 | ||
ab147185 MD |
1403 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1404 | ret = snprintf(modprobe, sizeof(modprobe), | |
1405 | "/sbin/modprobe %s%s", | |
1406 | kernel_modules_list[i].required ? "" : "--quiet ", | |
1407 | kernel_modules_list[i].name); | |
b73401da DG |
1408 | if (ret < 0) { |
1409 | perror("snprintf modprobe"); | |
1410 | goto error; | |
1411 | } | |
ab147185 | 1412 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1413 | ret = system(modprobe); |
ab147185 MD |
1414 | if (ret == -1) { |
1415 | ERR("Unable to launch modprobe for module %s", | |
1416 | kernel_modules_list[i].name); | |
1417 | } else if (kernel_modules_list[i].required | |
d9800920 | 1418 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1419 | ERR("Unable to load module %s", |
1420 | kernel_modules_list[i].name); | |
1421 | } else { | |
1422 | DBG("Modprobe successfully %s", | |
1423 | kernel_modules_list[i].name); | |
1424 | } | |
1425 | } | |
1426 | ||
1427 | error: | |
1428 | return ret; | |
1429 | } | |
1430 | ||
b73401da | 1431 | /* |
d063d709 | 1432 | * mount_debugfs |
b73401da DG |
1433 | */ |
1434 | static int mount_debugfs(char *path) | |
1435 | { | |
1436 | int ret; | |
1437 | char *type = "debugfs"; | |
1438 | ||
996b65c8 | 1439 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1440 | if (ret < 0) { |
7272acf5 | 1441 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1442 | goto error; |
1443 | } | |
1444 | ||
1445 | ret = mount(type, path, type, 0, NULL); | |
1446 | if (ret < 0) { | |
7272acf5 | 1447 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1448 | goto error; |
1449 | } | |
1450 | ||
1451 | DBG("Mounted debugfs successfully at %s", path); | |
1452 | ||
1453 | error: | |
1454 | return ret; | |
1455 | } | |
1456 | ||
8c0faa1d | 1457 | /* |
d063d709 | 1458 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1459 | */ |
f3ed775e | 1460 | static void init_kernel_tracer(void) |
8c0faa1d | 1461 | { |
b73401da DG |
1462 | int ret; |
1463 | char *proc_mounts = "/proc/mounts"; | |
1464 | char line[256]; | |
684d34d2 | 1465 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1466 | FILE *fp; |
1467 | ||
1468 | /* Detect debugfs */ | |
1469 | fp = fopen(proc_mounts, "r"); | |
1470 | if (fp == NULL) { | |
1471 | ERR("Unable to probe %s", proc_mounts); | |
1472 | goto error; | |
1473 | } | |
1474 | ||
1475 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1476 | if (strstr(line, "debugfs") != NULL) { | |
1477 | /* Remove first string */ | |
1478 | strtok(line, " "); | |
1479 | /* Dup string here so we can reuse line later on */ | |
1480 | debugfs_path = strdup(strtok(NULL, " ")); | |
1481 | DBG("Got debugfs path : %s", debugfs_path); | |
1482 | break; | |
1483 | } | |
1484 | } | |
1485 | ||
1486 | fclose(fp); | |
1487 | ||
1488 | /* Mount debugfs if needded */ | |
1489 | if (debugfs_path == NULL) { | |
1490 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1491 | if (ret < 0) { | |
1492 | perror("asprintf debugfs path"); | |
1493 | goto error; | |
1494 | } | |
1495 | ret = mount_debugfs(debugfs_path); | |
1496 | if (ret < 0) { | |
7272acf5 | 1497 | perror("Cannot mount debugfs"); |
b73401da DG |
1498 | goto error; |
1499 | } | |
1500 | } | |
1501 | ||
1502 | /* Modprobe lttng kernel modules */ | |
1503 | ret = modprobe_kernel_modules(); | |
1504 | if (ret < 0) { | |
1505 | goto error; | |
1506 | } | |
1507 | ||
1508 | /* Setup lttng kernel path */ | |
1509 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1510 | if (ret < 0) { | |
1511 | perror("asprintf lttng path"); | |
1512 | goto error; | |
1513 | } | |
1514 | ||
1515 | /* Open debugfs lttng */ | |
1516 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1517 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1518 | DBG("Failed to open %s", lttng_path); |
1519 | goto error; | |
8c0faa1d DG |
1520 | } |
1521 | ||
b73401da DG |
1522 | free(lttng_path); |
1523 | free(debugfs_path); | |
f3ed775e | 1524 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1525 | return; |
1526 | ||
1527 | error: | |
1528 | if (lttng_path) { | |
1529 | free(lttng_path); | |
1530 | } | |
1531 | if (debugfs_path) { | |
1532 | free(debugfs_path); | |
1533 | } | |
1534 | WARN("No kernel tracer available"); | |
1535 | kernel_tracer_fd = 0; | |
1536 | return; | |
f3ed775e | 1537 | } |
33a2b854 | 1538 | |
f3ed775e | 1539 | /* |
54d01ffb | 1540 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1541 | */ |
54d01ffb | 1542 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1543 | { |
f40799e8 | 1544 | int ret = 0; |
8c0faa1d | 1545 | |
f3ed775e | 1546 | if (session->kconsumer_fds_sent == 0) { |
d9800920 | 1547 | /* |
54d01ffb DG |
1548 | * Assign default kernel consumer socket if no consumer assigned to the |
1549 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1550 | * an extra security check. | |
d9800920 DG |
1551 | */ |
1552 | if (session->consumer_fd == 0) { | |
1553 | session->consumer_fd = kconsumerd_cmd_sock; | |
1554 | } | |
1555 | ||
1556 | ret = send_kconsumerd_fds(session); | |
f3ed775e | 1557 | if (ret < 0) { |
f3ed775e DG |
1558 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1559 | goto error; | |
1560 | } | |
1d4b027a | 1561 | |
f3ed775e DG |
1562 | session->kconsumer_fds_sent = 1; |
1563 | } | |
1d4b027a DG |
1564 | |
1565 | error: | |
1566 | return ret; | |
8c0faa1d DG |
1567 | } |
1568 | ||
0177d773 DG |
1569 | /* |
1570 | * Create an UST session and add it to the session ust list. | |
1571 | */ | |
44d3bd01 DG |
1572 | static int create_ust_session(struct ltt_session *session, |
1573 | struct lttng_domain *domain) | |
0177d773 | 1574 | { |
44d3bd01 | 1575 | int ret; |
0177d773 | 1576 | struct ltt_ust_session *lus; |
56fff090 | 1577 | struct ust_app *app; |
44d3bd01 DG |
1578 | |
1579 | switch (domain->type) { | |
1580 | case LTTNG_DOMAIN_UST_PID: | |
56fff090 | 1581 | app = ust_app_get_by_pid(domain->attr.pid); |
44d3bd01 DG |
1582 | if (app == NULL) { |
1583 | ret = LTTCOMM_APP_NOT_FOUND; | |
1584 | goto error; | |
1585 | } | |
1586 | break; | |
1587 | default: | |
1588 | goto error; | |
1589 | } | |
0177d773 DG |
1590 | |
1591 | DBG("Creating UST session"); | |
1592 | ||
44d3bd01 | 1593 | lus = trace_ust_create_session(session->path, domain->attr.pid, domain); |
0177d773 | 1594 | if (lus == NULL) { |
44d3bd01 | 1595 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1596 | goto error; |
1597 | } | |
1598 | ||
1599 | ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG, | |
1600 | geteuid(), allowed_group()); | |
1601 | if (ret < 0) { | |
1602 | if (ret != -EEXIST) { | |
1603 | ERR("Trace directory creation error"); | |
44d3bd01 | 1604 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1605 | goto error; |
1606 | } | |
1607 | } | |
1608 | ||
1609 | /* Create session on the UST tracer */ | |
44d3bd01 | 1610 | ret = ustctl_create_session(app->sock, lus); |
0177d773 | 1611 | if (ret < 0) { |
44d3bd01 | 1612 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1613 | goto error; |
1614 | } | |
1615 | ||
44d3bd01 DG |
1616 | cds_list_add(&lus->list, &session->ust_session_list.head); |
1617 | session->ust_session_list.count++; | |
1618 | ||
1619 | return LTTCOMM_OK; | |
0177d773 DG |
1620 | |
1621 | error: | |
1622 | free(lus); | |
1623 | return ret; | |
1624 | } | |
1625 | ||
333f285e | 1626 | /* |
d063d709 | 1627 | * Create a kernel tracer session then create the default channel. |
333f285e | 1628 | */ |
f3ed775e | 1629 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1630 | { |
f3ed775e | 1631 | int ret; |
f3ed775e DG |
1632 | |
1633 | DBG("Creating kernel session"); | |
1634 | ||
1635 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1636 | if (ret < 0) { | |
1637 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1638 | goto error; | |
333f285e DG |
1639 | } |
1640 | ||
d9800920 DG |
1641 | /* Set kernel consumer socket fd */ |
1642 | if (kconsumerd_cmd_sock) { | |
1643 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
1644 | } | |
1645 | ||
63053e7c DG |
1646 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1647 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1648 | if (ret < 0) { |
996b65c8 | 1649 | if (ret != -EEXIST) { |
7a485870 DG |
1650 | ERR("Trace directory creation error"); |
1651 | goto error; | |
1652 | } | |
1653 | } | |
1654 | ||
f3ed775e DG |
1655 | error: |
1656 | return ret; | |
333f285e DG |
1657 | } |
1658 | ||
6c9cc2ab DG |
1659 | /* |
1660 | * Using the session list, filled a lttng_session array to send back to the | |
1661 | * client for session listing. | |
1662 | * | |
1663 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1664 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab DG |
1665 | */ |
1666 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1667 | { | |
1668 | int i = 0; | |
1669 | struct ltt_session *session; | |
1670 | ||
1671 | DBG("Getting all available session"); | |
1672 | /* | |
1673 | * Iterate over session list and append data after the control struct in | |
1674 | * the buffer. | |
1675 | */ | |
1676 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1677 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1678 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1679 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1680 | sessions[i].name[NAME_MAX - 1] = '\0'; |
6c9cc2ab DG |
1681 | i++; |
1682 | } | |
1683 | } | |
1684 | ||
9f19cc17 DG |
1685 | /* |
1686 | * Fill lttng_channel array of all channels. | |
1687 | */ | |
1688 | static void list_lttng_channels(struct ltt_session *session, | |
1689 | struct lttng_channel *channels) | |
1690 | { | |
1691 | int i = 0; | |
1692 | struct ltt_kernel_channel *kchan; | |
1693 | ||
1694 | DBG("Listing channels for session %s", session->name); | |
1695 | ||
1696 | /* Kernel channels */ | |
1697 | if (session->kernel_session != NULL) { | |
54d01ffb DG |
1698 | cds_list_for_each_entry(kchan, |
1699 | &session->kernel_session->channel_list.head, list) { | |
9f19cc17 DG |
1700 | /* Copy lttng_channel struct to array */ |
1701 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1702 | channels[i].enabled = kchan->enabled; | |
1703 | i++; | |
1704 | } | |
1705 | } | |
1706 | ||
1707 | /* TODO: Missing UST listing */ | |
1708 | } | |
1709 | ||
1710 | /* | |
1711 | * Fill lttng_event array of all events in the channel. | |
1712 | */ | |
1713 | static void list_lttng_events(struct ltt_kernel_channel *kchan, | |
1714 | struct lttng_event *events) | |
1715 | { | |
1716 | /* | |
1717 | * TODO: This is ONLY kernel. Need UST support. | |
1718 | */ | |
1719 | int i = 0; | |
1720 | struct ltt_kernel_event *event; | |
1721 | ||
1722 | DBG("Listing events for channel %s", kchan->channel->name); | |
1723 | ||
1724 | /* Kernel channels */ | |
1725 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
1726 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1727 | events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
9f19cc17 DG |
1728 | events[i].enabled = event->enabled; |
1729 | switch (event->event->instrumentation) { | |
1730 | case LTTNG_KERNEL_TRACEPOINT: | |
1731 | events[i].type = LTTNG_EVENT_TRACEPOINT; | |
1732 | break; | |
1733 | case LTTNG_KERNEL_KPROBE: | |
1734 | case LTTNG_KERNEL_KRETPROBE: | |
1735 | events[i].type = LTTNG_EVENT_PROBE; | |
1736 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, | |
1737 | sizeof(struct lttng_kernel_kprobe)); | |
1738 | break; | |
1739 | case LTTNG_KERNEL_FUNCTION: | |
1740 | events[i].type = LTTNG_EVENT_FUNCTION; | |
1741 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, | |
1742 | sizeof(struct lttng_kernel_function)); | |
1743 | break; | |
0133c199 MD |
1744 | case LTTNG_KERNEL_NOOP: |
1745 | events[i].type = LTTNG_EVENT_NOOP; | |
1746 | break; | |
a54bd42d MD |
1747 | case LTTNG_KERNEL_SYSCALL: |
1748 | events[i].type = LTTNG_EVENT_SYSCALL; | |
0133c199 | 1749 | break; |
7a3d1328 MD |
1750 | case LTTNG_KERNEL_ALL: |
1751 | assert(0); | |
1752 | break; | |
9f19cc17 DG |
1753 | } |
1754 | i++; | |
1755 | } | |
1756 | } | |
1757 | ||
fac6795d | 1758 | /* |
54d01ffb | 1759 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 1760 | */ |
54d01ffb DG |
1761 | static int cmd_disable_channel(struct ltt_session *session, |
1762 | int domain, char *channel_name) | |
fac6795d | 1763 | { |
54d01ffb | 1764 | int ret; |
379473d2 | 1765 | |
54d01ffb DG |
1766 | switch (domain) { |
1767 | case LTTNG_DOMAIN_KERNEL: | |
1768 | ret = channel_kernel_disable(session->kernel_session, | |
1769 | channel_name); | |
1770 | if (ret != LTTCOMM_OK) { | |
333f285e DG |
1771 | goto error; |
1772 | } | |
54d01ffb DG |
1773 | |
1774 | kernel_wait_quiescent(kernel_tracer_fd); | |
d0254c7c | 1775 | break; |
44d3bd01 DG |
1776 | case LTTNG_DOMAIN_UST_PID: |
1777 | break; | |
d0254c7c | 1778 | default: |
44d3bd01 | 1779 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
54d01ffb | 1780 | goto error; |
20fe2104 DG |
1781 | } |
1782 | ||
54d01ffb | 1783 | ret = LTTCOMM_OK; |
d65106b1 | 1784 | |
54d01ffb DG |
1785 | error: |
1786 | return ret; | |
1787 | } | |
1788 | ||
56fff090 DG |
1789 | /* |
1790 | * Copy channel from attributes and set it in the application channel list. | |
1791 | */ | |
1792 | static int copy_ust_channel_to_app(struct ltt_ust_session *usess, | |
1793 | struct lttng_channel *attr, struct ust_app *app) | |
1794 | { | |
1795 | int ret; | |
1796 | struct ltt_ust_channel *uchan, *new_chan; | |
1797 | ||
1798 | uchan = trace_ust_get_channel_by_name(attr->name, usess); | |
1799 | if (uchan == NULL) { | |
1800 | ret = LTTCOMM_FATAL; | |
1801 | goto error; | |
1802 | } | |
1803 | ||
1804 | new_chan = trace_ust_create_channel(attr, usess->path); | |
1805 | if (new_chan == NULL) { | |
1806 | PERROR("malloc ltt_ust_channel"); | |
1807 | ret = LTTCOMM_FATAL; | |
1808 | goto error; | |
1809 | } | |
1810 | ||
1811 | ret = channel_ust_copy(new_chan, uchan); | |
1812 | if (ret < 0) { | |
1813 | ret = LTTCOMM_FATAL; | |
1814 | goto error; | |
1815 | } | |
1816 | ||
1817 | /* Add channel to the ust app channel list */ | |
1818 | cds_list_add(&new_chan->list, &app->channels.head); | |
1819 | app->channels.count++; | |
1820 | ||
1821 | error: | |
1822 | return ret; | |
1823 | } | |
1824 | ||
54d01ffb DG |
1825 | /* |
1826 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1827 | */ | |
44d3bd01 DG |
1828 | static int cmd_enable_channel(struct ltt_session *session, |
1829 | struct lttng_domain *domain, struct lttng_channel *attr) | |
54d01ffb DG |
1830 | { |
1831 | int ret; | |
d65106b1 | 1832 | |
44d3bd01 DG |
1833 | switch (domain->type) { |
1834 | case LTTNG_DOMAIN_KERNEL: | |
1835 | { | |
1836 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 1837 | |
44d3bd01 DG |
1838 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1839 | session->kernel_session); | |
1840 | if (kchan == NULL) { | |
1841 | ret = channel_kernel_create(session->kernel_session, | |
1842 | attr, kernel_poll_pipe[1]); | |
1843 | } else { | |
1844 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1845 | } | |
1846 | ||
1847 | if (ret != LTTCOMM_OK) { | |
1848 | goto error; | |
1849 | } | |
1850 | ||
1851 | kernel_wait_quiescent(kernel_tracer_fd); | |
1852 | break; | |
1853 | } | |
1854 | case LTTNG_DOMAIN_UST_PID: | |
1855 | { | |
56fff090 DG |
1856 | int sock; |
1857 | struct ltt_ust_channel *uchan; | |
44d3bd01 | 1858 | struct ltt_ust_session *usess; |
56fff090 | 1859 | struct ust_app *app; |
44d3bd01 DG |
1860 | |
1861 | usess = trace_ust_get_session_by_pid(&session->ust_session_list, | |
1862 | domain->attr.pid); | |
1863 | if (usess == NULL) { | |
1864 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
1865 | goto error; | |
1866 | } | |
1867 | ||
56fff090 | 1868 | app = ust_app_get_by_pid(domain->attr.pid); |
44d3bd01 DG |
1869 | if (app == NULL) { |
1870 | ret = LTTCOMM_APP_NOT_FOUND; | |
1871 | goto error; | |
1872 | } | |
56fff090 | 1873 | sock = app->sock; |
44d3bd01 DG |
1874 | |
1875 | uchan = trace_ust_get_channel_by_name(attr->name, usess); | |
1876 | if (uchan == NULL) { | |
56fff090 | 1877 | ret = channel_ust_create(usess, attr, sock); |
44d3bd01 | 1878 | } else { |
56fff090 | 1879 | ret = channel_ust_enable(usess, uchan, sock); |
44d3bd01 DG |
1880 | } |
1881 | ||
1882 | if (ret != LTTCOMM_OK) { | |
1883 | goto error; | |
1884 | } | |
1885 | ||
56fff090 DG |
1886 | ret = copy_ust_channel_to_app(usess, attr, app); |
1887 | if (ret != LTTCOMM_OK) { | |
44d3bd01 DG |
1888 | goto error; |
1889 | } | |
1890 | ||
44d3bd01 DG |
1891 | DBG("UST channel %s created for app sock %d with pid %d", |
1892 | attr->name, app->sock, domain->attr.pid); | |
1893 | break; | |
1894 | } | |
1895 | default: | |
1896 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
1897 | goto error; | |
54d01ffb DG |
1898 | } |
1899 | ||
1900 | ret = LTTCOMM_OK; | |
1901 | ||
1902 | error: | |
1903 | return ret; | |
1904 | } | |
1905 | ||
1906 | /* | |
1907 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1908 | */ | |
1909 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
1910 | char *channel_name, char *event_name) | |
1911 | { | |
1912 | int ret; | |
1913 | struct ltt_kernel_channel *kchan; | |
1914 | ||
1915 | switch (domain) { | |
1916 | case LTTNG_DOMAIN_KERNEL: | |
1917 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1918 | session->kernel_session); | |
1919 | if (kchan == NULL) { | |
1920 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1921 | goto error; | |
d65106b1 DG |
1922 | } |
1923 | ||
7a3d1328 | 1924 | ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name); |
54d01ffb DG |
1925 | if (ret != LTTCOMM_OK) { |
1926 | goto error; | |
1927 | } | |
1928 | ||
1929 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 1930 | break; |
54d01ffb DG |
1931 | default: |
1932 | /* TODO: Userspace tracing */ | |
1933 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1934 | goto error; | |
d65106b1 | 1935 | } |
26cc6b4e | 1936 | |
54d01ffb DG |
1937 | ret = LTTCOMM_OK; |
1938 | ||
1939 | error: | |
1940 | return ret; | |
1941 | } | |
1942 | ||
1943 | /* | |
1944 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
1945 | */ | |
1946 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
1947 | char *channel_name) | |
1948 | { | |
1949 | int ret; | |
1950 | struct ltt_kernel_channel *kchan; | |
1951 | ||
1952 | switch (domain) { | |
1953 | case LTTNG_DOMAIN_KERNEL: | |
1954 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1955 | session->kernel_session); | |
1956 | if (kchan == NULL) { | |
1957 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1958 | goto error; | |
26cc6b4e DG |
1959 | } |
1960 | ||
54d01ffb DG |
1961 | ret = event_kernel_disable_all(session->kernel_session, kchan); |
1962 | if (ret != LTTCOMM_OK) { | |
0b97ec54 | 1963 | goto error; |
26cc6b4e DG |
1964 | } |
1965 | ||
54d01ffb | 1966 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 1967 | break; |
54d01ffb DG |
1968 | default: |
1969 | /* TODO: Userspace tracing */ | |
1970 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1971 | goto error; | |
26cc6b4e | 1972 | } |
e953ef25 | 1973 | |
54d01ffb | 1974 | ret = LTTCOMM_OK; |
e953ef25 | 1975 | |
54d01ffb DG |
1976 | error: |
1977 | return ret; | |
1978 | } | |
f5177a38 | 1979 | |
54d01ffb DG |
1980 | /* |
1981 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1982 | */ | |
1983 | static int cmd_add_context(struct ltt_session *session, int domain, | |
1984 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
1985 | { | |
1986 | int ret; | |
f5177a38 | 1987 | |
54d01ffb DG |
1988 | switch (domain) { |
1989 | case LTTNG_DOMAIN_KERNEL: | |
1990 | /* Add kernel context to kernel tracer */ | |
1991 | ret = context_kernel_add(session->kernel_session, ctx, | |
1992 | event_name, channel_name); | |
1993 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 1994 | goto error; |
e953ef25 DG |
1995 | } |
1996 | ||
e953ef25 | 1997 | break; |
54d01ffb DG |
1998 | default: |
1999 | /* TODO: Userspace tracing */ | |
2000 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2001 | goto error; | |
e953ef25 | 2002 | } |
950131af | 2003 | |
54d01ffb | 2004 | ret = LTTCOMM_OK; |
950131af | 2005 | |
54d01ffb DG |
2006 | error: |
2007 | return ret; | |
2008 | } | |
2009 | ||
2010 | /* | |
2011 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2012 | */ | |
2013 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2014 | char *channel_name, struct lttng_event *event) | |
2015 | { | |
2016 | int ret; | |
2017 | struct ltt_kernel_channel *kchan; | |
2018 | ||
2019 | switch (domain) { | |
2020 | case LTTNG_DOMAIN_KERNEL: | |
2021 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2022 | session->kernel_session); | |
2023 | if (kchan == NULL) { | |
2024 | /* This call will notify the kernel thread */ | |
44d3bd01 | 2025 | ret = channel_kernel_create(session->kernel_session, |
54d01ffb DG |
2026 | NULL, kernel_poll_pipe[1]); |
2027 | if (ret != LTTCOMM_OK) { | |
f5177a38 DG |
2028 | goto error; |
2029 | } | |
54d01ffb | 2030 | } |
950131af | 2031 | |
54d01ffb DG |
2032 | /* Get the newly created kernel channel pointer */ |
2033 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2034 | session->kernel_session); | |
2035 | if (kchan == NULL) { | |
2036 | /* This sould not happen... */ | |
2037 | ret = LTTCOMM_FATAL; | |
2038 | goto error; | |
2039 | } | |
f5177a38 | 2040 | |
7a3d1328 | 2041 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, event); |
54d01ffb | 2042 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2043 | goto error; |
950131af DG |
2044 | } |
2045 | ||
54d01ffb | 2046 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2047 | break; |
54d01ffb DG |
2048 | default: |
2049 | /* TODO: Userspace tracing */ | |
2050 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2051 | goto error; | |
950131af | 2052 | } |
d36b8583 | 2053 | |
54d01ffb | 2054 | ret = LTTCOMM_OK; |
d36b8583 | 2055 | |
54d01ffb DG |
2056 | error: |
2057 | return ret; | |
2058 | } | |
7d29a247 | 2059 | |
54d01ffb DG |
2060 | /* |
2061 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2062 | */ | |
2063 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2064 | char *channel_name, int event_type) |
54d01ffb DG |
2065 | { |
2066 | int ret; | |
2067 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2068 | |
54d01ffb DG |
2069 | switch (domain) { |
2070 | case LTTNG_DOMAIN_KERNEL: | |
2071 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2072 | session->kernel_session); | |
2073 | if (kchan == NULL) { | |
2074 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2075 | ret = channel_kernel_create(session->kernel_session, NULL, |
2076 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2077 | if (ret != LTTCOMM_OK) { |
2078 | goto error; | |
d36b8583 | 2079 | } |
54d01ffb | 2080 | } |
0d0c377a | 2081 | |
54d01ffb DG |
2082 | /* Get the newly created kernel channel pointer */ |
2083 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2084 | session->kernel_session); | |
2085 | if (kchan == NULL) { | |
2086 | /* This sould not happen... */ | |
2087 | ret = LTTCOMM_FATAL; | |
2088 | goto error; | |
2089 | } | |
0fdd1e2c | 2090 | |
7a3d1328 MD |
2091 | switch (event_type) { |
2092 | case LTTNG_KERNEL_SYSCALL: | |
2093 | ret = event_kernel_enable_all_syscalls(session->kernel_session, | |
8c9ae521 | 2094 | kchan, kernel_tracer_fd); |
7a3d1328 MD |
2095 | break; |
2096 | case LTTNG_KERNEL_TRACEPOINT: | |
8c9ae521 | 2097 | /* |
7a3d1328 MD |
2098 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2099 | * events already registered to the channel. | |
8c9ae521 | 2100 | */ |
7a3d1328 MD |
2101 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2102 | kchan, kernel_tracer_fd); | |
2103 | break; | |
2104 | case LTTNG_KERNEL_ALL: | |
2105 | /* Enable syscalls and tracepoints */ | |
8c9ae521 DG |
2106 | ret = event_kernel_enable_all(session->kernel_session, |
2107 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2108 | break; |
2109 | default: | |
2110 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2111 | goto error; | |
8c9ae521 | 2112 | } |
54d01ffb | 2113 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2114 | goto error; |
d36b8583 DG |
2115 | } |
2116 | ||
54d01ffb | 2117 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2118 | break; |
54d01ffb DG |
2119 | default: |
2120 | /* TODO: Userspace tracing */ | |
2121 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2122 | goto error; | |
d36b8583 | 2123 | } |
f3ed775e | 2124 | |
54d01ffb DG |
2125 | ret = LTTCOMM_OK; |
2126 | ||
2127 | error: | |
2128 | return ret; | |
2129 | } | |
2130 | ||
2131 | /* | |
2132 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2133 | */ | |
2134 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2135 | { | |
2136 | int ret; | |
2137 | ssize_t nb_events = 0; | |
2138 | ||
2139 | switch (domain) { | |
2140 | case LTTNG_DOMAIN_KERNEL: | |
2141 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2142 | if (nb_events < 0) { | |
2143 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2144 | goto error; | |
894be886 | 2145 | } |
54d01ffb DG |
2146 | break; |
2147 | default: | |
2148 | /* TODO: Userspace listing */ | |
2149 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2150 | goto error; | |
2151 | } | |
894be886 | 2152 | |
54d01ffb | 2153 | return nb_events; |
7d29a247 | 2154 | |
54d01ffb DG |
2155 | error: |
2156 | /* Return negative value to differentiate return code */ | |
2157 | return -ret; | |
2158 | } | |
b389abbe | 2159 | |
54d01ffb DG |
2160 | /* |
2161 | * Command LTTNG_START_TRACE processed by the client thread. | |
2162 | */ | |
2163 | static int cmd_start_trace(struct ltt_session *session) | |
2164 | { | |
2165 | int ret; | |
2166 | struct ltt_kernel_channel *kchan; | |
2167 | struct ltt_kernel_session *ksession; | |
b389abbe | 2168 | |
54d01ffb DG |
2169 | /* Short cut */ |
2170 | ksession = session->kernel_session; | |
5eb91c98 | 2171 | |
54d01ffb DG |
2172 | /* Kernel tracing */ |
2173 | if (ksession != NULL) { | |
2174 | /* Open kernel metadata */ | |
2175 | if (ksession->metadata == NULL) { | |
2176 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2177 | if (ret < 0) { | |
2178 | ret = LTTCOMM_KERN_META_FAIL; | |
2179 | goto error; | |
b389abbe | 2180 | } |
54d01ffb | 2181 | } |
7d29a247 | 2182 | |
54d01ffb DG |
2183 | /* Open kernel metadata stream */ |
2184 | if (ksession->metadata_stream_fd == 0) { | |
2185 | ret = kernel_open_metadata_stream(ksession); | |
2186 | if (ret < 0) { | |
2187 | ERR("Kernel create metadata stream failed"); | |
2188 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2189 | goto error; | |
2190 | } | |
2191 | } | |
2192 | ||
2193 | /* For each channel */ | |
2194 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2195 | if (kchan->stream_count == 0) { | |
2196 | ret = kernel_open_channel_stream(kchan); | |
2197 | if (ret < 0) { | |
2198 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2199 | goto error; |
2200 | } | |
54d01ffb DG |
2201 | /* Update the stream global counter */ |
2202 | ksession->stream_count_global += ret; | |
7d29a247 | 2203 | } |
54d01ffb DG |
2204 | } |
2205 | ||
2206 | /* Setup kernel consumer socket and send fds to it */ | |
2207 | ret = init_kernel_tracing(ksession); | |
2208 | if (ret < 0) { | |
2209 | ret = LTTCOMM_KERN_START_FAIL; | |
2210 | goto error; | |
2211 | } | |
2212 | ||
2213 | /* This start the kernel tracing */ | |
2214 | ret = kernel_start_session(ksession); | |
2215 | if (ret < 0) { | |
2216 | ret = LTTCOMM_KERN_START_FAIL; | |
2217 | goto error; | |
2218 | } | |
2219 | ||
2220 | /* Quiescent wait after starting trace */ | |
2221 | kernel_wait_quiescent(kernel_tracer_fd); | |
2222 | } | |
2223 | ||
2224 | /* TODO: Start all UST traces */ | |
2225 | ||
2226 | ret = LTTCOMM_OK; | |
2227 | ||
2228 | error: | |
2229 | return ret; | |
2230 | } | |
2231 | ||
2232 | /* | |
2233 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2234 | */ | |
2235 | static int cmd_stop_trace(struct ltt_session *session) | |
2236 | { | |
2237 | int ret; | |
2238 | struct ltt_kernel_channel *kchan; | |
2239 | struct ltt_kernel_session *ksession; | |
2240 | ||
2241 | /* Short cut */ | |
2242 | ksession = session->kernel_session; | |
2243 | ||
2244 | /* Kernel tracer */ | |
2245 | if (ksession != NULL) { | |
2246 | DBG("Stop kernel tracing"); | |
2247 | ||
2248 | /* Flush all buffers before stopping */ | |
2249 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2250 | if (ret < 0) { | |
2251 | ERR("Kernel metadata flush failed"); | |
2252 | } | |
f34daff7 | 2253 | |
54d01ffb DG |
2254 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2255 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2256 | if (ret < 0) { |
54d01ffb | 2257 | ERR("Kernel flush buffer error"); |
7d29a247 | 2258 | } |
54d01ffb | 2259 | } |
19e70852 | 2260 | |
54d01ffb DG |
2261 | ret = kernel_stop_session(ksession); |
2262 | if (ret < 0) { | |
2263 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2264 | goto error; |
f3ed775e | 2265 | } |
54d01ffb DG |
2266 | |
2267 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2268 | } |
54d01ffb DG |
2269 | |
2270 | /* TODO : User-space tracer */ | |
2271 | ||
2272 | ret = LTTCOMM_OK; | |
2273 | ||
2274 | error: | |
2275 | return ret; | |
2276 | } | |
2277 | ||
2278 | /* | |
2279 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2280 | */ | |
2281 | static int cmd_create_session(char *name, char *path) | |
2282 | { | |
2283 | int ret; | |
2284 | ||
2285 | ret = session_create(name, path); | |
2286 | if (ret != LTTCOMM_OK) { | |
2287 | goto error; | |
2288 | } | |
2289 | ||
2290 | ret = LTTCOMM_OK; | |
2291 | ||
2292 | error: | |
2293 | return ret; | |
2294 | } | |
2295 | ||
2296 | /* | |
2297 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2298 | */ | |
2299 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2300 | { | |
2301 | int ret; | |
2302 | ||
2303 | /* Clean kernel session teardown */ | |
2304 | teardown_kernel_session(session); | |
2305 | ||
2306 | /* | |
2307 | * Must notify the kernel thread here to update it's poll setin order | |
2308 | * to remove the channel(s)' fd just destroyed. | |
2309 | */ | |
2310 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2311 | if (ret < 0) { | |
2312 | perror("write kernel poll pipe"); | |
2313 | } | |
2314 | ||
2315 | ret = session_destroy(name); | |
2316 | ||
2317 | return ret; | |
2318 | } | |
2319 | ||
2320 | /* | |
2321 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2322 | */ | |
2323 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2324 | { | |
2325 | int ret; | |
2326 | ||
2327 | switch (domain) { | |
2328 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 2329 | { |
54d01ffb | 2330 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 2331 | |
54d01ffb DG |
2332 | kcalibrate.type = calibrate->type; |
2333 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 2334 | if (ret < 0) { |
54d01ffb DG |
2335 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
2336 | goto error; | |
33a2b854 | 2337 | } |
54d01ffb DG |
2338 | break; |
2339 | } | |
2340 | default: | |
2341 | /* TODO: Userspace tracing */ | |
2342 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2343 | goto error; | |
2344 | } | |
33a2b854 | 2345 | |
54d01ffb | 2346 | ret = LTTCOMM_OK; |
33a2b854 | 2347 | |
54d01ffb DG |
2348 | error: |
2349 | return ret; | |
2350 | } | |
7d29a247 | 2351 | |
54d01ffb DG |
2352 | /* |
2353 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2354 | */ | |
2355 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
2356 | char *sock_path) | |
2357 | { | |
2358 | int ret, sock; | |
b389abbe | 2359 | |
54d01ffb DG |
2360 | switch (domain) { |
2361 | case LTTNG_DOMAIN_KERNEL: | |
2362 | /* Can't register a consumer if there is already one */ | |
2363 | if (session->kernel_session->consumer_fd != 0) { | |
2364 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
2365 | goto error; | |
2366 | } | |
2367 | ||
2368 | sock = lttcomm_connect_unix_sock(sock_path); | |
2369 | if (sock < 0) { | |
2370 | ret = LTTCOMM_CONNECT_FAIL; | |
2371 | goto error; | |
2372 | } | |
2373 | ||
2374 | session->kernel_session->consumer_fd = sock; | |
2375 | break; | |
2376 | default: | |
2377 | /* TODO: Userspace tracing */ | |
2378 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2379 | goto error; | |
2380 | } | |
2381 | ||
2382 | ret = LTTCOMM_OK; | |
2383 | ||
2384 | error: | |
2385 | return ret; | |
2386 | } | |
2387 | ||
2388 | /* | |
2389 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2390 | */ | |
2391 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
2392 | struct lttng_domain **domains) | |
2393 | { | |
2394 | int ret; | |
2395 | ssize_t nb_dom = 0; | |
2396 | ||
2397 | if (session->kernel_session != NULL) { | |
2398 | nb_dom++; | |
2399 | } | |
2400 | ||
2401 | nb_dom += session->ust_session_list.count; | |
2402 | ||
2403 | *domains = malloc(nb_dom * sizeof(struct lttng_domain)); | |
2404 | if (*domains == NULL) { | |
2405 | ret = -LTTCOMM_FATAL; | |
2406 | goto error; | |
2407 | } | |
2408 | ||
2409 | (*domains)[0].type = LTTNG_DOMAIN_KERNEL; | |
2410 | ||
2411 | /* TODO: User-space tracer domain support */ | |
2412 | ||
2413 | return nb_dom; | |
2414 | ||
2415 | error: | |
2416 | return ret; | |
2417 | } | |
2418 | ||
2419 | /* | |
2420 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2421 | */ | |
2422 | static ssize_t cmd_list_channels(struct ltt_session *session, | |
2423 | struct lttng_channel **channels) | |
2424 | { | |
2425 | int ret; | |
2426 | ssize_t nb_chan = 0; | |
2427 | ||
2428 | if (session->kernel_session != NULL) { | |
2429 | nb_chan += session->kernel_session->channel_count; | |
2430 | } | |
2431 | ||
2432 | *channels = malloc(nb_chan * sizeof(struct lttng_channel)); | |
2433 | if (*channels == NULL) { | |
2434 | ret = -LTTCOMM_FATAL; | |
2435 | goto error; | |
2436 | } | |
2437 | ||
2438 | list_lttng_channels(session, *channels); | |
2439 | ||
2440 | return nb_chan; | |
2441 | ||
2442 | error: | |
2443 | return ret; | |
2444 | } | |
2445 | ||
2446 | /* | |
2447 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2448 | */ | |
2449 | static ssize_t cmd_list_events(struct ltt_session *session, | |
2450 | char *channel_name, struct lttng_event **events) | |
2451 | { | |
2452 | int ret; | |
2453 | ssize_t nb_event = 0; | |
2454 | struct ltt_kernel_channel *kchan = NULL; | |
2455 | ||
2456 | if (session->kernel_session != NULL) { | |
2457 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2458 | session->kernel_session); | |
2459 | if (kchan == NULL) { | |
2460 | ret = -LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2461 | goto error; | |
2462 | } | |
2463 | nb_event += kchan->event_count; | |
2464 | } | |
2465 | ||
2466 | *events = malloc(nb_event * sizeof(struct lttng_event)); | |
2467 | if (*events == NULL) { | |
2468 | ret = -LTTCOMM_FATAL; | |
2469 | goto error; | |
2470 | } | |
2471 | ||
2472 | list_lttng_events(kchan, *events); | |
2473 | ||
2474 | /* TODO: User-space tracer support */ | |
2475 | ||
2476 | return nb_event; | |
2477 | ||
2478 | error: | |
2479 | return ret; | |
2480 | } | |
2481 | ||
2482 | /* | |
2483 | * Process the command requested by the lttng client within the command | |
2484 | * context structure. This function make sure that the return structure (llm) | |
2485 | * is set and ready for transmission before returning. | |
2486 | * | |
2487 | * Return any error encountered or 0 for success. | |
2488 | */ | |
2489 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
2490 | { | |
2491 | int ret = LTTCOMM_OK; | |
44d3bd01 | 2492 | int need_tracing_session = 1; |
54d01ffb DG |
2493 | |
2494 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2495 | ||
2496 | /* | |
2497 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2498 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2499 | * command. |
2500 | */ | |
2501 | switch(cmd_ctx->lsm->cmd_type) { | |
2502 | case LTTNG_LIST_SESSIONS: | |
2503 | case LTTNG_LIST_TRACEPOINTS: | |
2504 | case LTTNG_LIST_DOMAINS: | |
2505 | case LTTNG_LIST_CHANNELS: | |
2506 | case LTTNG_LIST_EVENTS: | |
2507 | break; | |
2508 | default: | |
2509 | /* Setup lttng message with no payload */ | |
2510 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2511 | if (ret < 0) { | |
2512 | /* This label does not try to unlock the session */ | |
2513 | goto init_setup_error; | |
2514 | } | |
2515 | } | |
2516 | ||
2517 | /* Commands that DO NOT need a session. */ | |
2518 | switch (cmd_ctx->lsm->cmd_type) { | |
2519 | case LTTNG_CALIBRATE: | |
2520 | case LTTNG_CREATE_SESSION: | |
2521 | case LTTNG_LIST_SESSIONS: | |
2522 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 2523 | need_tracing_session = 0; |
54d01ffb DG |
2524 | break; |
2525 | default: | |
2526 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
2527 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); | |
2528 | if (cmd_ctx->session == NULL) { | |
2529 | if (cmd_ctx->lsm->session.name != NULL) { | |
2530 | ret = LTTCOMM_SESS_NOT_FOUND; | |
2531 | } else { | |
2532 | /* If no session name specified */ | |
2533 | ret = LTTCOMM_SELECT_SESS; | |
2534 | } | |
2535 | goto error; | |
2536 | } else { | |
2537 | /* Acquire lock for the session */ | |
2538 | session_lock(cmd_ctx->session); | |
2539 | } | |
2540 | break; | |
2541 | } | |
b389abbe | 2542 | |
54d01ffb DG |
2543 | /* |
2544 | * Check domain type for specific "pre-action". | |
2545 | */ | |
2546 | switch (cmd_ctx->lsm->domain.type) { | |
2547 | case LTTNG_DOMAIN_KERNEL: | |
2548 | /* Kernel tracer check */ | |
2549 | if (kernel_tracer_fd == 0) { | |
2550 | /* Basically, load kernel tracer modules */ | |
2551 | init_kernel_tracer(); | |
2552 | if (kernel_tracer_fd == 0) { | |
2553 | ret = LTTCOMM_KERN_NA; | |
2554 | goto error; | |
2555 | } | |
2556 | } | |
5eb91c98 | 2557 | |
54d01ffb | 2558 | /* Need a session for kernel command */ |
44d3bd01 | 2559 | if (need_tracing_session) { |
54d01ffb DG |
2560 | if (cmd_ctx->session->kernel_session == NULL) { |
2561 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 2562 | if (ret < 0) { |
54d01ffb | 2563 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
2564 | goto error; |
2565 | } | |
b389abbe | 2566 | } |
7d29a247 | 2567 | |
54d01ffb DG |
2568 | /* Start the kernel consumer daemon */ |
2569 | if (kconsumerd_pid == 0 && | |
2570 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
2571 | ret = start_kconsumerd(); | |
7d29a247 | 2572 | if (ret < 0) { |
54d01ffb DG |
2573 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
2574 | goto error; | |
950131af | 2575 | } |
33a2b854 | 2576 | } |
0d0c377a | 2577 | } |
54d01ffb | 2578 | break; |
44d3bd01 DG |
2579 | case LTTNG_DOMAIN_UST_PID: |
2580 | { | |
2581 | struct ltt_ust_session *usess; | |
2582 | ||
2583 | if (need_tracing_session) { | |
2584 | usess = trace_ust_get_session_by_pid( | |
2585 | &cmd_ctx->session->ust_session_list, | |
2586 | cmd_ctx->lsm->domain.attr.pid); | |
2587 | if (usess == NULL) { | |
2588 | ret = create_ust_session(cmd_ctx->session, | |
2589 | &cmd_ctx->lsm->domain); | |
2590 | if (ret != LTTCOMM_OK) { | |
2591 | goto error; | |
2592 | } | |
2593 | } | |
2594 | } | |
2595 | break; | |
2596 | } | |
54d01ffb DG |
2597 | default: |
2598 | /* TODO Userspace tracer */ | |
2599 | break; | |
2600 | } | |
33a2b854 | 2601 | |
54d01ffb DG |
2602 | /* Process by command type */ |
2603 | switch (cmd_ctx->lsm->cmd_type) { | |
2604 | case LTTNG_ADD_CONTEXT: | |
2605 | { | |
2606 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2607 | cmd_ctx->lsm->u.context.channel_name, | |
2608 | cmd_ctx->lsm->u.context.event_name, | |
2609 | &cmd_ctx->lsm->u.context.ctx); | |
2610 | break; | |
2611 | } | |
2612 | case LTTNG_DISABLE_CHANNEL: | |
2613 | { | |
2614 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2615 | cmd_ctx->lsm->u.disable.channel_name); | |
2616 | break; | |
2617 | } | |
2618 | case LTTNG_DISABLE_EVENT: | |
2619 | { | |
2620 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2621 | cmd_ctx->lsm->u.disable.channel_name, | |
2622 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2623 | ret = LTTCOMM_OK; |
2624 | break; | |
2625 | } | |
54d01ffb DG |
2626 | case LTTNG_DISABLE_ALL_EVENT: |
2627 | { | |
2628 | DBG("Disabling all kernel event"); | |
2629 | ||
2630 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2631 | cmd_ctx->lsm->u.disable.channel_name); | |
2632 | break; | |
2633 | } | |
2634 | case LTTNG_ENABLE_CHANNEL: | |
2635 | { | |
44d3bd01 | 2636 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb DG |
2637 | &cmd_ctx->lsm->u.channel.chan); |
2638 | break; | |
2639 | } | |
2640 | case LTTNG_ENABLE_EVENT: | |
2641 | { | |
2642 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2643 | cmd_ctx->lsm->u.enable.channel_name, | |
2644 | &cmd_ctx->lsm->u.enable.event); | |
2645 | break; | |
2646 | } | |
2647 | case LTTNG_ENABLE_ALL_EVENT: | |
2648 | { | |
2649 | DBG("Enabling all kernel event"); | |
2650 | ||
2651 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
2652 | cmd_ctx->lsm->u.enable.channel_name, |
2653 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
2654 | break; |
2655 | } | |
052da939 | 2656 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2657 | { |
9f19cc17 | 2658 | struct lttng_event *events; |
54d01ffb | 2659 | ssize_t nb_events; |
052da939 | 2660 | |
54d01ffb DG |
2661 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2662 | if (nb_events < 0) { | |
2663 | ret = -nb_events; | |
2664 | goto error; | |
2ef84c95 DG |
2665 | } |
2666 | ||
2667 | /* | |
2668 | * Setup lttng message with payload size set to the event list size in | |
2669 | * bytes and then copy list into the llm payload. | |
2670 | */ | |
052da939 | 2671 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2672 | if (ret < 0) { |
052da939 | 2673 | free(events); |
2ef84c95 DG |
2674 | goto setup_error; |
2675 | } | |
2676 | ||
2677 | /* Copy event list into message payload */ | |
9f19cc17 | 2678 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2679 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2680 | |
9f19cc17 | 2681 | free(events); |
2ef84c95 DG |
2682 | |
2683 | ret = LTTCOMM_OK; | |
2684 | break; | |
2685 | } | |
f3ed775e | 2686 | case LTTNG_START_TRACE: |
8c0faa1d | 2687 | { |
54d01ffb | 2688 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
2689 | break; |
2690 | } | |
f3ed775e | 2691 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2692 | { |
54d01ffb | 2693 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
2694 | break; |
2695 | } | |
5e16da05 MD |
2696 | case LTTNG_CREATE_SESSION: |
2697 | { | |
54d01ffb DG |
2698 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
2699 | cmd_ctx->lsm->session.path); | |
5e16da05 MD |
2700 | break; |
2701 | } | |
2702 | case LTTNG_DESTROY_SESSION: | |
2703 | { | |
54d01ffb DG |
2704 | ret = cmd_destroy_session(cmd_ctx->session, |
2705 | cmd_ctx->lsm->session.name); | |
5461b305 | 2706 | break; |
5e16da05 | 2707 | } |
9f19cc17 | 2708 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2709 | { |
54d01ffb DG |
2710 | ssize_t nb_dom; |
2711 | struct lttng_domain *domains; | |
5461b305 | 2712 | |
54d01ffb DG |
2713 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
2714 | if (nb_dom < 0) { | |
2715 | ret = -nb_dom; | |
2716 | goto error; | |
ce3d728c | 2717 | } |
520ff687 | 2718 | |
54d01ffb | 2719 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
2720 | if (ret < 0) { |
2721 | goto setup_error; | |
520ff687 | 2722 | } |
57167058 | 2723 | |
54d01ffb DG |
2724 | /* Copy event list into message payload */ |
2725 | memcpy(cmd_ctx->llm->payload, domains, | |
2726 | nb_dom * sizeof(struct lttng_domain)); | |
2727 | ||
2728 | free(domains); | |
5e16da05 | 2729 | |
5461b305 | 2730 | ret = LTTCOMM_OK; |
5e16da05 MD |
2731 | break; |
2732 | } | |
9f19cc17 | 2733 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2734 | { |
54d01ffb DG |
2735 | size_t nb_chan; |
2736 | struct lttng_channel *channels; | |
2737 | ||
2738 | nb_chan = cmd_list_channels(cmd_ctx->session, &channels); | |
2739 | if (nb_chan < 0) { | |
2740 | ret = -nb_chan; | |
2741 | goto error; | |
5461b305 | 2742 | } |
ca95a216 | 2743 | |
54d01ffb | 2744 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
2745 | if (ret < 0) { |
2746 | goto setup_error; | |
2747 | } | |
9f19cc17 | 2748 | |
54d01ffb DG |
2749 | /* Copy event list into message payload */ |
2750 | memcpy(cmd_ctx->llm->payload, channels, | |
2751 | nb_chan * sizeof(struct lttng_channel)); | |
2752 | ||
2753 | free(channels); | |
9f19cc17 DG |
2754 | |
2755 | ret = LTTCOMM_OK; | |
5461b305 | 2756 | break; |
5e16da05 | 2757 | } |
9f19cc17 | 2758 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2759 | { |
54d01ffb | 2760 | size_t nb_event; |
684d34d2 | 2761 | struct lttng_event *events = NULL; |
9f19cc17 | 2762 | |
54d01ffb DG |
2763 | nb_event = cmd_list_events(cmd_ctx->session, |
2764 | cmd_ctx->lsm->u.list.channel_name, &events); | |
2765 | if (nb_event < 0) { | |
2766 | ret = -nb_event; | |
2767 | goto error; | |
5461b305 | 2768 | } |
ca95a216 | 2769 | |
54d01ffb | 2770 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
2771 | if (ret < 0) { |
2772 | goto setup_error; | |
2773 | } | |
9f19cc17 | 2774 | |
54d01ffb DG |
2775 | /* Copy event list into message payload */ |
2776 | memcpy(cmd_ctx->llm->payload, events, | |
2777 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 2778 | |
54d01ffb | 2779 | free(events); |
9f19cc17 DG |
2780 | |
2781 | ret = LTTCOMM_OK; | |
5461b305 | 2782 | break; |
5e16da05 MD |
2783 | } |
2784 | case LTTNG_LIST_SESSIONS: | |
2785 | { | |
54d01ffb | 2786 | session_lock_list(); |
5461b305 | 2787 | |
6c9cc2ab | 2788 | if (session_list_ptr->count == 0) { |
f3ed775e | 2789 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 2790 | session_unlock_list(); |
5461b305 | 2791 | goto error; |
57167058 | 2792 | } |
5e16da05 | 2793 | |
6c9cc2ab DG |
2794 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
2795 | session_list_ptr->count); | |
5461b305 | 2796 | if (ret < 0) { |
54d01ffb | 2797 | session_unlock_list(); |
5461b305 | 2798 | goto setup_error; |
e065084a | 2799 | } |
5e16da05 | 2800 | |
6c9cc2ab DG |
2801 | /* Filled the session array */ |
2802 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
2803 | ||
54d01ffb | 2804 | session_unlock_list(); |
5e16da05 | 2805 | |
5461b305 | 2806 | ret = LTTCOMM_OK; |
5e16da05 MD |
2807 | break; |
2808 | } | |
d0254c7c MD |
2809 | case LTTNG_CALIBRATE: |
2810 | { | |
54d01ffb DG |
2811 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
2812 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
2813 | break; |
2814 | } | |
d9800920 DG |
2815 | case LTTNG_REGISTER_CONSUMER: |
2816 | { | |
54d01ffb DG |
2817 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2818 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
2819 | break; |
2820 | } | |
5e16da05 | 2821 | default: |
5e16da05 | 2822 | ret = LTTCOMM_UND; |
5461b305 | 2823 | break; |
fac6795d DG |
2824 | } |
2825 | ||
5461b305 | 2826 | error: |
5461b305 DG |
2827 | if (cmd_ctx->llm == NULL) { |
2828 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2829 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2830 | goto setup_error; |
2831 | } | |
2832 | } | |
54d01ffb | 2833 | /* Set return code */ |
5461b305 | 2834 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 2835 | setup_error: |
b5541356 | 2836 | if (cmd_ctx->session) { |
54d01ffb | 2837 | session_unlock(cmd_ctx->session); |
b5541356 | 2838 | } |
54d01ffb | 2839 | init_setup_error: |
8028d920 | 2840 | return ret; |
fac6795d DG |
2841 | } |
2842 | ||
1d4b027a | 2843 | /* |
d063d709 DG |
2844 | * This thread manage all clients request using the unix client socket for |
2845 | * communication. | |
1d4b027a DG |
2846 | */ |
2847 | static void *thread_manage_clients(void *data) | |
2848 | { | |
5eb91c98 DG |
2849 | int sock = 0, ret, i, pollfd; |
2850 | uint32_t revents, nb_fd; | |
273ea72c | 2851 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 2852 | struct lttng_poll_event events; |
1d4b027a DG |
2853 | |
2854 | DBG("[thread] Manage client started"); | |
2855 | ||
2856 | ret = lttcomm_listen_unix_sock(client_sock); | |
2857 | if (ret < 0) { | |
2858 | goto error; | |
2859 | } | |
2860 | ||
5eb91c98 DG |
2861 | /* |
2862 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2863 | * more will be added to this poll set. | |
2864 | */ | |
2865 | ret = create_thread_poll_set(&events, 2); | |
2866 | if (ret < 0) { | |
2867 | goto error; | |
2868 | } | |
273ea72c | 2869 | |
5eb91c98 DG |
2870 | /* Add the application registration socket */ |
2871 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
2872 | if (ret < 0) { | |
2873 | goto error; | |
2874 | } | |
273ea72c | 2875 | |
bbd973c2 DG |
2876 | /* |
2877 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
2878 | */ |
2879 | if (opt_sig_parent) { | |
2880 | kill(ppid, SIGCHLD); | |
2881 | } | |
2882 | ||
2883 | while (1) { | |
1d4b027a | 2884 | DBG("Accepting client command ..."); |
273ea72c | 2885 | |
5eb91c98 DG |
2886 | nb_fd = LTTNG_POLL_GETNB(&events); |
2887 | ||
273ea72c | 2888 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 2889 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 2890 | if (ret < 0) { |
273ea72c DG |
2891 | goto error; |
2892 | } | |
2893 | ||
5eb91c98 DG |
2894 | for (i = 0; i < nb_fd; i++) { |
2895 | /* Fetch once the poll data */ | |
2896 | revents = LTTNG_POLL_GETEV(&events, i); | |
2897 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2898 | ||
2899 | /* Thread quit pipe has been closed. Killing thread. */ | |
2900 | ret = check_thread_quit_pipe(pollfd, revents); | |
2901 | if (ret) { | |
2902 | goto error; | |
2903 | } | |
2904 | ||
2905 | /* Event on the registration socket */ | |
2906 | if (pollfd == client_sock) { | |
2907 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2908 | ERR("Client socket poll error"); | |
2909 | goto error; | |
2910 | } | |
2911 | } | |
2912 | } | |
2913 | ||
2914 | DBG("Wait for client response"); | |
2915 | ||
2916 | sock = lttcomm_accept_unix_sock(client_sock); | |
2917 | if (sock < 0) { | |
273ea72c | 2918 | goto error; |
273ea72c DG |
2919 | } |
2920 | ||
5eb91c98 DG |
2921 | /* Allocate context command to process the client request */ |
2922 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
2923 | if (cmd_ctx == NULL) { | |
2924 | perror("malloc cmd_ctx"); | |
1d4b027a | 2925 | goto error; |
5eb91c98 | 2926 | } |
1d4b027a | 2927 | |
5eb91c98 DG |
2928 | /* Allocate data buffer for reception */ |
2929 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
2930 | if (cmd_ctx->lsm == NULL) { | |
2931 | perror("malloc cmd_ctx->lsm"); | |
2932 | goto error; | |
2933 | } | |
1d4b027a | 2934 | |
5eb91c98 DG |
2935 | cmd_ctx->llm = NULL; |
2936 | cmd_ctx->session = NULL; | |
1d4b027a | 2937 | |
5eb91c98 DG |
2938 | /* |
2939 | * Data is received from the lttng client. The struct | |
2940 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2941 | * the client. | |
2942 | */ | |
2943 | DBG("Receiving data from client ..."); | |
2944 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, | |
2945 | sizeof(struct lttcomm_session_msg)); | |
2946 | if (ret <= 0) { | |
2947 | DBG("Nothing recv() from client... continuing"); | |
2948 | close(sock); | |
2949 | free(cmd_ctx); | |
2950 | continue; | |
2951 | } | |
1d4b027a | 2952 | |
5eb91c98 DG |
2953 | // TODO: Validate cmd_ctx including sanity check for |
2954 | // security purpose. | |
f7776ea7 | 2955 | |
5eb91c98 DG |
2956 | /* |
2957 | * This function dispatch the work to the kernel or userspace tracer | |
2958 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2959 | * informations for the client. The command context struct contains | |
2960 | * everything this function may needs. | |
2961 | */ | |
2962 | ret = process_client_msg(cmd_ctx); | |
2963 | if (ret < 0) { | |
bbd973c2 | 2964 | /* |
5eb91c98 DG |
2965 | * TODO: Inform client somehow of the fatal error. At |
2966 | * this point, ret < 0 means that a malloc failed | |
2967 | * (ENOMEM). Error detected but still accept command. | |
bbd973c2 | 2968 | */ |
bbd973c2 | 2969 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
2970 | continue; |
2971 | } | |
d6e4fca4 | 2972 | |
54d01ffb DG |
2973 | DBG("Sending response (size: %d, retcode: %s)", |
2974 | cmd_ctx->lttng_msg_size, | |
532d79a7 | 2975 | lttng_get_readable_code(-cmd_ctx->llm->ret_code)); |
54d01ffb | 2976 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
2977 | if (ret < 0) { |
2978 | ERR("Failed to send data back to client"); | |
bbd973c2 | 2979 | } |
1d4b027a | 2980 | |
5eb91c98 DG |
2981 | clean_command_ctx(&cmd_ctx); |
2982 | ||
2983 | /* End of transmission */ | |
273ea72c DG |
2984 | close(sock); |
2985 | } | |
2986 | ||
5eb91c98 DG |
2987 | error: |
2988 | DBG("Client thread dying"); | |
273ea72c | 2989 | unlink(client_unix_sock_path); |
5eb91c98 DG |
2990 | close(client_sock); |
2991 | close(sock); | |
273ea72c | 2992 | |
5eb91c98 | 2993 | lttng_poll_clean(&events); |
a2fb29a5 | 2994 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2995 | return NULL; |
2996 | } | |
2997 | ||
2998 | ||
fac6795d DG |
2999 | /* |
3000 | * usage function on stderr | |
3001 | */ | |
3002 | static void usage(void) | |
3003 | { | |
b716ce68 | 3004 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3005 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3006 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3007 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3008 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3009 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
3010 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
3011 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3012 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3013 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3014 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3015 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
31f73cc9 | 3016 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
fac6795d DG |
3017 | } |
3018 | ||
3019 | /* | |
3020 | * daemon argument parsing | |
3021 | */ | |
3022 | static int parse_args(int argc, char **argv) | |
3023 | { | |
3024 | int c; | |
3025 | ||
3026 | static struct option long_options[] = { | |
3027 | { "client-sock", 1, 0, 'c' }, | |
3028 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
3029 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
3030 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 3031 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3032 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3033 | { "help", 0, 0, 'h' }, |
3034 | { "group", 1, 0, 'g' }, | |
3035 | { "version", 0, 0, 'V' }, | |
75462a81 | 3036 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3037 | { "verbose", 0, 0, 'v' }, |
31f73cc9 | 3038 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
fac6795d DG |
3039 | { NULL, 0, 0, 0 } |
3040 | }; | |
3041 | ||
3042 | while (1) { | |
3043 | int option_index = 0; | |
54d01ffb DG |
3044 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", |
3045 | long_options, &option_index); | |
fac6795d DG |
3046 | if (c == -1) { |
3047 | break; | |
3048 | } | |
3049 | ||
3050 | switch (c) { | |
3051 | case 0: | |
3052 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3053 | if (optarg) { | |
3054 | fprintf(stderr, " with arg %s\n", optarg); | |
3055 | } | |
3056 | break; | |
b716ce68 | 3057 | case 'c': |
fac6795d DG |
3058 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3059 | break; | |
3060 | case 'a': | |
3061 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3062 | break; | |
3063 | case 'd': | |
3064 | opt_daemon = 1; | |
3065 | break; | |
3066 | case 'g': | |
3067 | opt_tracing_group = strdup(optarg); | |
3068 | break; | |
3069 | case 'h': | |
3070 | usage(); | |
3071 | exit(EXIT_FAILURE); | |
3072 | case 'V': | |
3073 | fprintf(stdout, "%s\n", VERSION); | |
3074 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3075 | case 'S': |
3076 | opt_sig_parent = 1; | |
3077 | break; | |
d6f42150 DG |
3078 | case 'E': |
3079 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3080 | break; | |
3081 | case 'C': | |
3082 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
3083 | break; | |
75462a81 DG |
3084 | case 'q': |
3085 | opt_quiet = 1; | |
3086 | break; | |
3f9947db | 3087 | case 'v': |
53086306 DG |
3088 | /* Verbose level can increase using multiple -v */ |
3089 | opt_verbose += 1; | |
3f9947db | 3090 | break; |
31f73cc9 MD |
3091 | case 'Z': |
3092 | opt_verbose_kconsumerd += 1; | |
3093 | break; | |
fac6795d DG |
3094 | default: |
3095 | /* Unknown option or other error. | |
3096 | * Error is printed by getopt, just return */ | |
3097 | return -1; | |
3098 | } | |
3099 | } | |
3100 | ||
3101 | return 0; | |
3102 | } | |
3103 | ||
3104 | /* | |
d063d709 | 3105 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3106 | * apps_sock - The communication socket for all UST apps. |
3107 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3108 | */ |
cf3af59e | 3109 | static int init_daemon_socket(void) |
fac6795d DG |
3110 | { |
3111 | int ret = 0; | |
3112 | mode_t old_umask; | |
3113 | ||
3114 | old_umask = umask(0); | |
3115 | ||
3116 | /* Create client tool unix socket */ | |
d6f42150 DG |
3117 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3118 | if (client_sock < 0) { | |
3119 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3120 | ret = -1; |
3121 | goto end; | |
3122 | } | |
3123 | ||
3124 | /* File permission MUST be 660 */ | |
3125 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3126 | if (ret < 0) { | |
d6f42150 | 3127 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3128 | perror("chmod"); |
3129 | goto end; | |
3130 | } | |
3131 | ||
3132 | /* Create the application unix socket */ | |
d6f42150 DG |
3133 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3134 | if (apps_sock < 0) { | |
3135 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3136 | ret = -1; |
3137 | goto end; | |
3138 | } | |
3139 | ||
d6f42150 | 3140 | /* File permission MUST be 666 */ |
54d01ffb DG |
3141 | ret = chmod(apps_unix_sock_path, |
3142 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3143 | if (ret < 0) { |
d6f42150 | 3144 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3145 | perror("chmod"); |
3146 | goto end; | |
3147 | } | |
3148 | ||
3149 | end: | |
3150 | umask(old_umask); | |
3151 | return ret; | |
3152 | } | |
3153 | ||
3154 | /* | |
54d01ffb DG |
3155 | * Check if the global socket is available, and if a daemon is answering at the |
3156 | * other side. If yes, error is returned. | |
fac6795d | 3157 | */ |
cf3af59e | 3158 | static int check_existing_daemon(void) |
fac6795d | 3159 | { |
7d8234d9 | 3160 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3161 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3162 | return 0; |
099e26bd | 3163 | } |
54d01ffb | 3164 | |
7d8234d9 | 3165 | /* Is there anybody out there ? */ |
099e26bd | 3166 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3167 | return -EEXIST; |
099e26bd | 3168 | } else { |
7d8234d9 | 3169 | return 0; |
099e26bd | 3170 | } |
fac6795d DG |
3171 | } |
3172 | ||
fac6795d | 3173 | /* |
d063d709 | 3174 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3175 | * |
d063d709 DG |
3176 | * Race window between mkdir and chown is OK because we are going from more |
3177 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 3178 | */ |
d6f42150 | 3179 | static int set_permissions(void) |
fac6795d DG |
3180 | { |
3181 | int ret; | |
996b65c8 | 3182 | gid_t gid; |
fac6795d | 3183 | |
996b65c8 MD |
3184 | gid = allowed_group(); |
3185 | if (gid < 0) { | |
a463f419 DG |
3186 | if (is_root) { |
3187 | WARN("No tracing group detected"); | |
3188 | ret = 0; | |
3189 | } else { | |
3190 | ERR("Missing tracing group. Aborting execution."); | |
3191 | ret = -1; | |
3192 | } | |
fac6795d DG |
3193 | goto end; |
3194 | } | |
3195 | ||
d6f42150 | 3196 | /* Set lttng run dir */ |
996b65c8 | 3197 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
3198 | if (ret < 0) { |
3199 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
3200 | perror("chown"); | |
3201 | } | |
3202 | ||
3203 | /* lttng client socket path */ | |
996b65c8 | 3204 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3205 | if (ret < 0) { |
d6f42150 DG |
3206 | ERR("Unable to set group on %s", client_unix_sock_path); |
3207 | perror("chown"); | |
3208 | } | |
3209 | ||
3210 | /* kconsumerd error socket path */ | |
996b65c8 | 3211 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
d6f42150 DG |
3212 | if (ret < 0) { |
3213 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
3214 | perror("chown"); |
3215 | } | |
3216 | ||
d6f42150 | 3217 | DBG("All permissions are set"); |
e07ae692 | 3218 | |
fac6795d DG |
3219 | end: |
3220 | return ret; | |
3221 | } | |
3222 | ||
7a485870 | 3223 | /* |
d063d709 | 3224 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
3225 | */ |
3226 | static int create_kernel_poll_pipe(void) | |
3227 | { | |
3228 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
3229 | } | |
3230 | ||
099e26bd DG |
3231 | /* |
3232 | * Create the application command pipe to wake thread_manage_apps. | |
3233 | */ | |
3234 | static int create_apps_cmd_pipe(void) | |
3235 | { | |
3236 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
3237 | } | |
3238 | ||
d6f42150 | 3239 | /* |
d063d709 | 3240 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
3241 | */ |
3242 | static int create_lttng_rundir(void) | |
3243 | { | |
3244 | int ret; | |
3245 | ||
3246 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
3247 | if (ret < 0) { | |
b1f11e69 DG |
3248 | if (errno != EEXIST) { |
3249 | ERR("Unable to create " LTTNG_RUNDIR); | |
3250 | goto error; | |
3251 | } else { | |
3252 | ret = 0; | |
3253 | } | |
d6f42150 DG |
3254 | } |
3255 | ||
3256 | error: | |
3257 | return ret; | |
3258 | } | |
3259 | ||
3260 | /* | |
d063d709 DG |
3261 | * Setup sockets and directory needed by the kconsumerd communication with the |
3262 | * session daemon. | |
d6f42150 DG |
3263 | */ |
3264 | static int set_kconsumerd_sockets(void) | |
3265 | { | |
3266 | int ret; | |
3267 | ||
3268 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
54d01ffb DG |
3269 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, |
3270 | KCONSUMERD_ERR_SOCK_PATH); | |
d6f42150 DG |
3271 | } |
3272 | ||
3273 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
54d01ffb DG |
3274 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, |
3275 | KCONSUMERD_CMD_SOCK_PATH); | |
d6f42150 DG |
3276 | } |
3277 | ||
3278 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
3279 | if (ret < 0) { | |
6beb2242 DG |
3280 | if (errno != EEXIST) { |
3281 | ERR("Failed to create " KCONSUMERD_PATH); | |
3282 | goto error; | |
3283 | } | |
3284 | ret = 0; | |
d6f42150 DG |
3285 | } |
3286 | ||
3287 | /* Create the kconsumerd error unix socket */ | |
54d01ffb DG |
3288 | kconsumerd_err_sock = |
3289 | lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
d6f42150 DG |
3290 | if (kconsumerd_err_sock < 0) { |
3291 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
3292 | ret = -1; | |
3293 | goto error; | |
3294 | } | |
3295 | ||
3296 | /* File permission MUST be 660 */ | |
54d01ffb DG |
3297 | ret = chmod(kconsumerd_err_unix_sock_path, |
3298 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
d6f42150 DG |
3299 | if (ret < 0) { |
3300 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
3301 | perror("chmod"); | |
3302 | goto error; | |
3303 | } | |
3304 | ||
3305 | error: | |
3306 | return ret; | |
3307 | } | |
3308 | ||
fac6795d | 3309 | /* |
d063d709 | 3310 | * Signal handler for the daemon |
cf3af59e | 3311 | * |
54d01ffb DG |
3312 | * Simply stop all worker threads, leaving main() return gracefully after |
3313 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3314 | */ |
3315 | static void sighandler(int sig) | |
3316 | { | |
3317 | switch (sig) { | |
cf3af59e MD |
3318 | case SIGPIPE: |
3319 | DBG("SIGPIPE catched"); | |
3320 | return; | |
3321 | case SIGINT: | |
3322 | DBG("SIGINT catched"); | |
3323 | stop_threads(); | |
3324 | break; | |
3325 | case SIGTERM: | |
3326 | DBG("SIGTERM catched"); | |
3327 | stop_threads(); | |
3328 | break; | |
3329 | default: | |
3330 | break; | |
fac6795d | 3331 | } |
fac6795d DG |
3332 | } |
3333 | ||
3334 | /* | |
d063d709 | 3335 | * Setup signal handler for : |
1d4b027a | 3336 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3337 | */ |
1d4b027a | 3338 | static int set_signal_handler(void) |
fac6795d | 3339 | { |
1d4b027a DG |
3340 | int ret = 0; |
3341 | struct sigaction sa; | |
3342 | sigset_t sigset; | |
fac6795d | 3343 | |
1d4b027a DG |
3344 | if ((ret = sigemptyset(&sigset)) < 0) { |
3345 | perror("sigemptyset"); | |
3346 | return ret; | |
3347 | } | |
d6f42150 | 3348 | |
1d4b027a DG |
3349 | sa.sa_handler = sighandler; |
3350 | sa.sa_mask = sigset; | |
3351 | sa.sa_flags = 0; | |
3352 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3353 | perror("sigaction"); | |
3354 | return ret; | |
d6f42150 DG |
3355 | } |
3356 | ||
1d4b027a DG |
3357 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3358 | perror("sigaction"); | |
3359 | return ret; | |
d6f42150 | 3360 | } |
aaf26714 | 3361 | |
1d4b027a DG |
3362 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3363 | perror("sigaction"); | |
3364 | return ret; | |
8c0faa1d DG |
3365 | } |
3366 | ||
1d4b027a DG |
3367 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3368 | ||
3369 | return ret; | |
fac6795d DG |
3370 | } |
3371 | ||
f3ed775e | 3372 | /* |
d063d709 DG |
3373 | * Set open files limit to unlimited. This daemon can open a large number of |
3374 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3375 | */ |
3376 | static void set_ulimit(void) | |
3377 | { | |
3378 | int ret; | |
3379 | struct rlimit lim; | |
3380 | ||
a88df331 | 3381 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3382 | lim.rlim_cur = 65535; |
3383 | lim.rlim_max = 65535; | |
3384 | ||
3385 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3386 | if (ret < 0) { | |
3387 | perror("failed to set open files limit"); | |
3388 | } | |
3389 | } | |
3390 | ||
fac6795d DG |
3391 | /* |
3392 | * main | |
3393 | */ | |
3394 | int main(int argc, char **argv) | |
3395 | { | |
fac6795d DG |
3396 | int ret = 0; |
3397 | void *status; | |
b082db07 | 3398 | const char *home_path; |
fac6795d | 3399 | |
273ea72c | 3400 | /* Create thread quit pipe */ |
cf3af59e MD |
3401 | if ((ret = init_thread_quit_pipe()) < 0) { |
3402 | goto error; | |
273ea72c DG |
3403 | } |
3404 | ||
fac6795d DG |
3405 | /* Parse arguments */ |
3406 | progname = argv[0]; | |
3407 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3408 | goto error; |
fac6795d DG |
3409 | } |
3410 | ||
3411 | /* Daemonize */ | |
3412 | if (opt_daemon) { | |
53094c05 DG |
3413 | ret = daemon(0, 0); |
3414 | if (ret < 0) { | |
3415 | perror("daemon"); | |
cf3af59e | 3416 | goto error; |
53094c05 | 3417 | } |
fac6795d DG |
3418 | } |
3419 | ||
3420 | /* Check if daemon is UID = 0 */ | |
3421 | is_root = !getuid(); | |
3422 | ||
fac6795d | 3423 | if (is_root) { |
d6f42150 DG |
3424 | ret = create_lttng_rundir(); |
3425 | if (ret < 0) { | |
cf3af59e | 3426 | goto error; |
d6f42150 DG |
3427 | } |
3428 | ||
fac6795d | 3429 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3430 | snprintf(apps_unix_sock_path, PATH_MAX, |
3431 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3432 | } |
3433 | ||
3434 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3435 | snprintf(client_unix_sock_path, PATH_MAX, |
3436 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3437 | } | |
0fdd1e2c DG |
3438 | |
3439 | /* Set global SHM for ust */ | |
3440 | if (strlen(wait_shm_path) == 0) { | |
3441 | snprintf(wait_shm_path, PATH_MAX, | |
3442 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3443 | } | |
fac6795d | 3444 | } else { |
b082db07 DG |
3445 | home_path = get_home_dir(); |
3446 | if (home_path == NULL) { | |
273ea72c DG |
3447 | /* TODO: Add --socket PATH option */ |
3448 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3449 | ret = -EPERM; |
3450 | goto error; | |
b082db07 DG |
3451 | } |
3452 | ||
fac6795d | 3453 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3454 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3455 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3456 | } |
3457 | ||
3458 | /* Set the cli tool unix socket path */ | |
3459 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3460 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3461 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 3462 | } |
0fdd1e2c DG |
3463 | |
3464 | /* Set global SHM for ust */ | |
3465 | if (strlen(wait_shm_path) == 0) { | |
3466 | snprintf(wait_shm_path, PATH_MAX, | |
3467 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
3468 | } | |
fac6795d DG |
3469 | } |
3470 | ||
847177cd DG |
3471 | DBG("Client socket path %s", client_unix_sock_path); |
3472 | DBG("Application socket path %s", apps_unix_sock_path); | |
3473 | ||
273ea72c | 3474 | /* |
7d8234d9 | 3475 | * See if daemon already exist. |
fac6795d | 3476 | */ |
7d8234d9 | 3477 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 3478 | ERR("Already running daemon.\n"); |
273ea72c | 3479 | /* |
cf3af59e MD |
3480 | * We do not goto exit because we must not cleanup() |
3481 | * because a daemon is already running. | |
ab118b20 | 3482 | */ |
cf3af59e | 3483 | goto error; |
a88df331 DG |
3484 | } |
3485 | ||
54d01ffb | 3486 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
3487 | |
3488 | /* | |
3489 | * These actions must be executed as root. We do that *after* setting up | |
3490 | * the sockets path because we MUST make the check for another daemon using | |
3491 | * those paths *before* trying to set the kernel consumer sockets and init | |
3492 | * kernel tracer. | |
3493 | */ | |
3494 | if (is_root) { | |
3495 | ret = set_kconsumerd_sockets(); | |
3496 | if (ret < 0) { | |
cf3af59e | 3497 | goto exit; |
a88df331 DG |
3498 | } |
3499 | ||
3500 | /* Setup kernel tracer */ | |
3501 | init_kernel_tracer(); | |
3502 | ||
3503 | /* Set ulimit for open files */ | |
3504 | set_ulimit(); | |
fac6795d DG |
3505 | } |
3506 | ||
cf3af59e MD |
3507 | if ((ret = set_signal_handler()) < 0) { |
3508 | goto exit; | |
fac6795d DG |
3509 | } |
3510 | ||
d6f42150 | 3511 | /* Setup the needed unix socket */ |
cf3af59e MD |
3512 | if ((ret = init_daemon_socket()) < 0) { |
3513 | goto exit; | |
fac6795d DG |
3514 | } |
3515 | ||
3516 | /* Set credentials to socket */ | |
cf3af59e MD |
3517 | if (is_root && ((ret = set_permissions()) < 0)) { |
3518 | goto exit; | |
fac6795d DG |
3519 | } |
3520 | ||
5b8719f5 DG |
3521 | /* Get parent pid if -S, --sig-parent is specified. */ |
3522 | if (opt_sig_parent) { | |
3523 | ppid = getppid(); | |
3524 | } | |
3525 | ||
7a485870 | 3526 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
3527 | if ((ret = create_kernel_poll_pipe()) < 0) { |
3528 | goto exit; | |
7a485870 DG |
3529 | } |
3530 | ||
099e26bd DG |
3531 | /* Setup the thread apps communication pipe. */ |
3532 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
3533 | goto exit; | |
3534 | } | |
3535 | ||
3536 | /* Init UST command queue. */ | |
3537 | cds_wfq_init(&ust_cmd_queue.queue); | |
3538 | ||
273ea72c | 3539 | /* |
54d01ffb DG |
3540 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
3541 | * statically declared in session.c | |
273ea72c | 3542 | */ |
54d01ffb | 3543 | session_list_ptr = session_get_list(); |
b5541356 | 3544 | |
5eb91c98 DG |
3545 | /* Set up max poll set size */ |
3546 | lttng_poll_set_max_size(); | |
3547 | ||
cf3af59e | 3548 | /* Create thread to manage the client socket */ |
099e26bd DG |
3549 | ret = pthread_create(&client_thread, NULL, |
3550 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 3551 | if (ret != 0) { |
099e26bd | 3552 | perror("pthread_create clients"); |
cf3af59e MD |
3553 | goto exit_client; |
3554 | } | |
fac6795d | 3555 | |
099e26bd DG |
3556 | /* Create thread to dispatch registration */ |
3557 | ret = pthread_create(&dispatch_thread, NULL, | |
3558 | thread_dispatch_ust_registration, (void *) NULL); | |
3559 | if (ret != 0) { | |
3560 | perror("pthread_create dispatch"); | |
3561 | goto exit_dispatch; | |
3562 | } | |
3563 | ||
3564 | /* Create thread to manage application registration. */ | |
3565 | ret = pthread_create(®_apps_thread, NULL, | |
3566 | thread_registration_apps, (void *) NULL); | |
3567 | if (ret != 0) { | |
3568 | perror("pthread_create registration"); | |
3569 | goto exit_reg_apps; | |
3570 | } | |
3571 | ||
cf3af59e | 3572 | /* Create thread to manage application socket */ |
54d01ffb DG |
3573 | ret = pthread_create(&apps_thread, NULL, |
3574 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 3575 | if (ret != 0) { |
099e26bd | 3576 | perror("pthread_create apps"); |
cf3af59e MD |
3577 | goto exit_apps; |
3578 | } | |
fac6795d | 3579 | |
cf3af59e | 3580 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
3581 | ret = pthread_create(&kernel_thread, NULL, |
3582 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 3583 | if (ret != 0) { |
099e26bd | 3584 | perror("pthread_create kernel"); |
cf3af59e MD |
3585 | goto exit_kernel; |
3586 | } | |
7a485870 | 3587 | |
cf3af59e MD |
3588 | ret = pthread_join(kernel_thread, &status); |
3589 | if (ret != 0) { | |
3590 | perror("pthread_join"); | |
3591 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
3592 | } |
3593 | ||
cf3af59e MD |
3594 | exit_kernel: |
3595 | ret = pthread_join(apps_thread, &status); | |
3596 | if (ret != 0) { | |
3597 | perror("pthread_join"); | |
3598 | goto error; /* join error, exit without cleanup */ | |
3599 | } | |
fac6795d | 3600 | |
cf3af59e | 3601 | exit_apps: |
099e26bd DG |
3602 | ret = pthread_join(reg_apps_thread, &status); |
3603 | if (ret != 0) { | |
3604 | perror("pthread_join"); | |
3605 | goto error; /* join error, exit without cleanup */ | |
3606 | } | |
3607 | ||
3608 | exit_reg_apps: | |
3609 | ret = pthread_join(dispatch_thread, &status); | |
3610 | if (ret != 0) { | |
3611 | perror("pthread_join"); | |
3612 | goto error; /* join error, exit without cleanup */ | |
3613 | } | |
3614 | ||
3615 | exit_dispatch: | |
cf3af59e MD |
3616 | ret = pthread_join(client_thread, &status); |
3617 | if (ret != 0) { | |
3618 | perror("pthread_join"); | |
3619 | goto error; /* join error, exit without cleanup */ | |
3620 | } | |
3621 | ||
3622 | ret = join_kconsumerd_thread(); | |
3623 | if (ret != 0) { | |
3624 | perror("join_kconsumerd"); | |
3625 | goto error; /* join error, exit without cleanup */ | |
3626 | } | |
a88df331 | 3627 | |
cf3af59e | 3628 | exit_client: |
a88df331 | 3629 | exit: |
cf3af59e MD |
3630 | /* |
3631 | * cleanup() is called when no other thread is running. | |
3632 | */ | |
3633 | cleanup(); | |
3634 | if (!ret) | |
3635 | exit(EXIT_SUCCESS); | |
3636 | error: | |
5e16da05 | 3637 | exit(EXIT_FAILURE); |
fac6795d | 3638 | } |