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 DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
82a3637f DG |
7 | * as published by the Free Software Foundation; only version 2 |
8 | * of the License. | |
91d76f53 | 9 | * |
fac6795d DG |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
91d76f53 | 14 | * |
fac6795d DG |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
18 | */ |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <fcntl.h> | |
22 | #include <getopt.h> | |
23 | #include <grp.h> | |
24 | #include <limits.h> | |
25 | #include <pthread.h> | |
8c0faa1d | 26 | #include <semaphore.h> |
fac6795d DG |
27 | #include <signal.h> |
28 | #include <stdio.h> | |
29 | #include <stdlib.h> | |
30 | #include <string.h> | |
0fdd1e2c | 31 | #include <sys/mman.h> |
b73401da | 32 | #include <sys/mount.h> |
1e307fab | 33 | #include <sys/resource.h> |
fac6795d DG |
34 | #include <sys/socket.h> |
35 | #include <sys/stat.h> | |
36 | #include <sys/types.h> | |
0fdd1e2c DG |
37 | #include <sys/wait.h> |
38 | #include <urcu/futex.h> | |
fac6795d DG |
39 | #include <unistd.h> |
40 | ||
1e307fab | 41 | #include <ltt-kconsumerd.h> |
e88129fc | 42 | #include <lttng-sessiond-comm.h> |
1e307fab DG |
43 | #include <lttng/lttng-kconsumerd.h> |
44 | #include <lttngerr.h> | |
fac6795d | 45 | |
5eb91c98 | 46 | #include "compat/poll.h" |
b579acd9 | 47 | #include "context.h" |
099e26bd | 48 | #include "futex.h" |
20fe2104 | 49 | #include "kernel-ctl.h" |
1e307fab | 50 | #include "ltt-sessiond.h" |
0fdd1e2c | 51 | #include "shm.h" |
91d76f53 | 52 | #include "traceable-app.h" |
1e307fab | 53 | #include "ust-ctl.h" |
8e68d1c8 | 54 | #include "utils.h" |
0177d773 | 55 | #include "ust-ctl.h" |
fac6795d | 56 | |
b25a8868 DG |
57 | #include "benchmark.h" |
58 | ||
75462a81 | 59 | /* Const values */ |
686204ab | 60 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 61 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
62 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
63 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
64 | ||
fac6795d | 65 | /* Variables */ |
1d4b027a | 66 | int opt_verbose; /* Not static for lttngerr.h */ |
31f73cc9 | 67 | int opt_verbose_kconsumerd; /* Not static for lttngerr.h */ |
1d4b027a | 68 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 69 | |
fac6795d DG |
70 | const char *progname; |
71 | const char *opt_tracing_group; | |
5b8719f5 | 72 | static int opt_sig_parent; |
fac6795d DG |
73 | static int opt_daemon; |
74 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a DG |
75 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
76 | static pid_t kconsumerd_pid; | |
099e26bd | 77 | static int dispatch_thread_exit; |
fac6795d | 78 | |
d6f42150 DG |
79 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ |
80 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
81 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */ | |
82 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */ | |
0fdd1e2c | 83 | static char wait_shm_path[PATH_MAX]; /* global wait shm path for UST */ |
fac6795d | 84 | |
1d4b027a | 85 | /* Sockets and FDs */ |
d6f42150 DG |
86 | static int client_sock; |
87 | static int apps_sock; | |
88 | static int kconsumerd_err_sock; | |
8c0faa1d | 89 | static int kconsumerd_cmd_sock; |
20fe2104 | 90 | static int kernel_tracer_fd; |
7a485870 | 91 | static int kernel_poll_pipe[2]; |
1d4b027a | 92 | |
273ea72c DG |
93 | /* |
94 | * Quit pipe for all threads. This permits a single cancellation point | |
95 | * for all threads when receiving an event on the pipe. | |
96 | */ | |
97 | static int thread_quit_pipe[2]; | |
98 | ||
099e26bd DG |
99 | /* |
100 | * This pipe is used to inform the thread managing application communication | |
101 | * that a command is queued and ready to be processed. | |
102 | */ | |
103 | static int apps_cmd_pipe[2]; | |
104 | ||
1d4b027a | 105 | /* Pthread, Mutexes and Semaphores */ |
8c0faa1d | 106 | static pthread_t kconsumerd_thread; |
1d4b027a | 107 | static pthread_t apps_thread; |
099e26bd | 108 | static pthread_t reg_apps_thread; |
1d4b027a | 109 | static pthread_t client_thread; |
7a485870 | 110 | static pthread_t kernel_thread; |
099e26bd | 111 | static pthread_t dispatch_thread; |
8c0faa1d DG |
112 | static sem_t kconsumerd_sem; |
113 | ||
5eb91c98 DG |
114 | |
115 | /* Mutex to control kconsumerd pid assignation */ | |
116 | static pthread_mutex_t kconsumerd_pid_mutex; | |
fac6795d | 117 | |
099e26bd DG |
118 | /* |
119 | * UST registration command queue. This queue is tied with a futex and uses a N | |
120 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
121 | * | |
122 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
123 | * this queue and the wait/wake scheme. | |
124 | */ | |
125 | static struct ust_cmd_queue ust_cmd_queue; | |
126 | ||
b5541356 DG |
127 | /* |
128 | * Pointer initialized before thread creation. | |
129 | * | |
130 | * This points to the tracing session list containing the session count and a | |
131 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
132 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 133 | * |
d063d709 DG |
134 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
135 | * lock_session_list and unlock_session_list for lock acquisition. | |
b5541356 DG |
136 | */ |
137 | static struct ltt_session_list *session_list_ptr; | |
138 | ||
5eb91c98 DG |
139 | /* |
140 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
141 | */ | |
142 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
143 | unsigned int size) | |
144 | { | |
145 | int ret; | |
146 | ||
147 | if (events == NULL || size == 0) { | |
148 | ret = -1; | |
149 | goto error; | |
150 | } | |
151 | ||
152 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
153 | if (ret < 0) { | |
154 | goto error; | |
155 | } | |
156 | ||
157 | /* Add quit pipe */ | |
158 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
159 | if (ret < 0) { | |
160 | goto error; | |
161 | } | |
162 | ||
163 | return 0; | |
164 | ||
165 | error: | |
166 | return ret; | |
167 | } | |
168 | ||
169 | /* | |
170 | * Check if the thread quit pipe was triggered. | |
171 | * | |
172 | * Return 1 if it was triggered else 0; | |
173 | */ | |
174 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
175 | { | |
176 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
177 | return 1; | |
178 | } | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
0fdd1e2c DG |
183 | /* |
184 | * Remove modules in reverse load order. | |
185 | */ | |
186 | static int modprobe_remove_kernel_modules(void) | |
187 | { | |
188 | int ret = 0, i; | |
189 | char modprobe[256]; | |
190 | ||
191 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
192 | ret = snprintf(modprobe, sizeof(modprobe), | |
193 | "/sbin/modprobe --remove --quiet %s", | |
194 | kernel_modules_list[i].name); | |
195 | if (ret < 0) { | |
196 | perror("snprintf modprobe --remove"); | |
197 | goto error; | |
198 | } | |
199 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
200 | ret = system(modprobe); | |
201 | if (ret == -1) { | |
202 | ERR("Unable to launch modprobe --remove for module %s", | |
203 | kernel_modules_list[i].name); | |
204 | } else if (kernel_modules_list[i].required | |
205 | && WEXITSTATUS(ret) != 0) { | |
206 | ERR("Unable to remove module %s", | |
207 | kernel_modules_list[i].name); | |
208 | } else { | |
209 | DBG("Modprobe removal successful %s", | |
210 | kernel_modules_list[i].name); | |
211 | } | |
212 | } | |
213 | ||
214 | error: | |
215 | return ret; | |
216 | } | |
217 | ||
218 | /* | |
219 | * Return group ID of the tracing group or -1 if not found. | |
220 | */ | |
996b65c8 MD |
221 | static gid_t allowed_group(void) |
222 | { | |
223 | struct group *grp; | |
224 | ||
274e143b MD |
225 | if (opt_tracing_group) { |
226 | grp = getgrnam(opt_tracing_group); | |
227 | } else { | |
228 | grp = getgrnam(default_tracing_group); | |
229 | } | |
996b65c8 MD |
230 | if (!grp) { |
231 | return -1; | |
232 | } else { | |
233 | return grp->gr_gid; | |
234 | } | |
235 | } | |
236 | ||
273ea72c | 237 | /* |
5eb91c98 | 238 | * Init thread quit pipe. |
273ea72c DG |
239 | * |
240 | * Return -1 on error or 0 if all pipes are created. | |
241 | */ | |
242 | static int init_thread_quit_pipe(void) | |
243 | { | |
244 | int ret; | |
245 | ||
246 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
247 | if (ret < 0) { | |
248 | perror("thread quit pipe"); | |
249 | goto error; | |
250 | } | |
251 | ||
252 | error: | |
253 | return ret; | |
254 | } | |
255 | ||
fac6795d | 256 | /* |
d063d709 DG |
257 | * Complete teardown of a kernel session. This free all data structure related |
258 | * to a kernel session and update counter. | |
fac6795d | 259 | */ |
1d4b027a | 260 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 261 | { |
1d4b027a DG |
262 | if (session->kernel_session != NULL) { |
263 | DBG("Tearing down kernel session"); | |
d9800920 DG |
264 | |
265 | /* | |
266 | * If a custom kernel consumer was registered, close the socket before | |
267 | * tearing down the complete kernel session structure | |
268 | */ | |
269 | if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) { | |
270 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
271 | } | |
272 | ||
62499ad6 | 273 | trace_kernel_destroy_session(session->kernel_session); |
1d4b027a DG |
274 | /* Extra precaution */ |
275 | session->kernel_session = NULL; | |
fac6795d | 276 | } |
fac6795d DG |
277 | } |
278 | ||
099e26bd DG |
279 | /* |
280 | * Stop all threads by closing the thread quit pipe. | |
281 | */ | |
cf3af59e MD |
282 | static void stop_threads(void) |
283 | { | |
5eb91c98 DG |
284 | int ret; |
285 | ||
cf3af59e MD |
286 | /* Stopping all threads */ |
287 | DBG("Terminating all threads"); | |
5eb91c98 DG |
288 | ret = write(thread_quit_pipe[1], "!", 1); |
289 | if (ret < 0) { | |
290 | ERR("write error on thread quit pipe"); | |
291 | } | |
292 | ||
099e26bd DG |
293 | /* Dispatch thread */ |
294 | dispatch_thread_exit = 1; | |
295 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
296 | } |
297 | ||
fac6795d | 298 | /* |
d063d709 | 299 | * Cleanup the daemon |
fac6795d | 300 | */ |
cf3af59e | 301 | static void cleanup(void) |
fac6795d | 302 | { |
1d4b027a DG |
303 | int ret; |
304 | char *cmd; | |
af9737e9 | 305 | struct ltt_session *sess, *stmp; |
fac6795d | 306 | |
1d4b027a | 307 | DBG("Cleaning up"); |
e07ae692 | 308 | |
1d4b027a | 309 | /* <fun> */ |
2f50c8a3 | 310 | MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" |
273ea72c DG |
311 | "Matthew, BEET driven development works!%c[%dm", |
312 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
1d4b027a | 313 | /* </fun> */ |
fac6795d | 314 | |
5eb91c98 DG |
315 | if (is_root) { |
316 | DBG("Removing %s directory", LTTNG_RUNDIR); | |
317 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
318 | if (ret < 0) { | |
319 | ERR("asprintf failed. Something is really wrong!"); | |
320 | } | |
5461b305 | 321 | |
5eb91c98 DG |
322 | /* Remove lttng run directory */ |
323 | ret = system(cmd); | |
324 | if (ret < 0) { | |
325 | ERR("Unable to clean " LTTNG_RUNDIR); | |
326 | } | |
1d4b027a | 327 | } |
5461b305 | 328 | |
1d4b027a | 329 | DBG("Cleaning up all session"); |
fac6795d | 330 | |
b5541356 | 331 | /* Destroy session list mutex */ |
273ea72c DG |
332 | if (session_list_ptr != NULL) { |
333 | pthread_mutex_destroy(&session_list_ptr->lock); | |
334 | ||
335 | /* Cleanup ALL session */ | |
af9737e9 | 336 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { |
273ea72c DG |
337 | teardown_kernel_session(sess); |
338 | // TODO complete session cleanup (including UST) | |
339 | } | |
340 | } | |
341 | ||
099e26bd DG |
342 | DBG("Closing all UST sockets"); |
343 | clean_traceable_apps_list(); | |
344 | ||
273ea72c | 345 | pthread_mutex_destroy(&kconsumerd_pid_mutex); |
b5541356 | 346 | |
f3ed775e | 347 | DBG("Closing kernel fd"); |
1d4b027a | 348 | close(kernel_tracer_fd); |
ab147185 | 349 | |
2f50c8a3 DG |
350 | if (is_root) { |
351 | DBG("Unloading kernel modules"); | |
352 | modprobe_remove_kernel_modules(); | |
353 | } | |
b25a8868 | 354 | |
5eb91c98 DG |
355 | close(thread_quit_pipe[0]); |
356 | close(thread_quit_pipe[1]); | |
dab4c8a1 | 357 | |
3c6bae61 DG |
358 | /* OUTPUT BENCHMARK RESULTS */ |
359 | bench_init(); | |
360 | ||
62d53818 DG |
361 | if (getenv("BENCH_UST_NOTIFY")) { |
362 | bench_print_ust_notification(); | |
363 | } | |
364 | ||
365 | if (getenv("BENCH_UST_REGISTER")) { | |
366 | bench_print_ust_register(); | |
367 | } | |
368 | ||
369 | if (getenv("BENCH_BOOT_PROCESS")) { | |
370 | bench_print_boot_process(); | |
371 | } | |
3c6bae61 DG |
372 | |
373 | bench_close(); | |
374 | /* END BENCHMARK */ | |
fac6795d DG |
375 | } |
376 | ||
e065084a | 377 | /* |
d063d709 | 378 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 379 | * |
d063d709 | 380 | * Return lttcomm error code. |
e065084a DG |
381 | */ |
382 | static int send_unix_sock(int sock, void *buf, size_t len) | |
383 | { | |
384 | /* Check valid length */ | |
385 | if (len <= 0) { | |
386 | return -1; | |
387 | } | |
388 | ||
389 | return lttcomm_send_unix_sock(sock, buf, len); | |
390 | } | |
391 | ||
5461b305 | 392 | /* |
d063d709 | 393 | * Free memory of a command context structure. |
5461b305 | 394 | */ |
a2fb29a5 | 395 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 396 | { |
a2fb29a5 DG |
397 | DBG("Clean command context structure"); |
398 | if (*cmd_ctx) { | |
399 | if ((*cmd_ctx)->llm) { | |
400 | free((*cmd_ctx)->llm); | |
5461b305 | 401 | } |
a2fb29a5 DG |
402 | if ((*cmd_ctx)->lsm) { |
403 | free((*cmd_ctx)->lsm); | |
5461b305 | 404 | } |
a2fb29a5 DG |
405 | free(*cmd_ctx); |
406 | *cmd_ctx = NULL; | |
5461b305 DG |
407 | } |
408 | } | |
409 | ||
f3ed775e | 410 | /* |
d063d709 | 411 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 412 | */ |
7a485870 | 413 | static int send_kconsumerd_channel_fds(int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
414 | { |
415 | int ret; | |
416 | size_t nb_fd; | |
417 | struct ltt_kernel_stream *stream; | |
f3ed775e DG |
418 | struct lttcomm_kconsumerd_header lkh; |
419 | struct lttcomm_kconsumerd_msg lkm; | |
420 | ||
7a485870 DG |
421 | DBG("Sending fds of channel %s to kernel consumer", channel->channel->name); |
422 | ||
423 | nb_fd = channel->stream_count; | |
f3ed775e DG |
424 | |
425 | /* Setup header */ | |
7a485870 | 426 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
f3ed775e DG |
427 | lkh.cmd_type = ADD_STREAM; |
428 | ||
429 | DBG("Sending kconsumerd header"); | |
430 | ||
431 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
432 | if (ret < 0) { | |
433 | perror("send kconsumerd header"); | |
434 | goto error; | |
435 | } | |
436 | ||
7a485870 DG |
437 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
438 | if (stream->fd != 0) { | |
f3ed775e DG |
439 | lkm.fd = stream->fd; |
440 | lkm.state = stream->state; | |
7a485870 | 441 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
e8b60857 | 442 | lkm.output = channel->channel->attr.output; |
f3ed775e | 443 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
99497cd0 | 444 | lkm.path_name[PATH_MAX - 1] = '\0'; |
f3ed775e DG |
445 | |
446 | DBG("Sending fd %d to kconsumerd", lkm.fd); | |
447 | ||
448 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
449 | if (ret < 0) { | |
450 | perror("send kconsumerd fd"); | |
451 | goto error; | |
452 | } | |
453 | } | |
454 | } | |
455 | ||
7a485870 | 456 | DBG("Kconsumerd channel fds sent"); |
f3ed775e DG |
457 | |
458 | return 0; | |
459 | ||
460 | error: | |
461 | return ret; | |
462 | } | |
463 | ||
464 | /* | |
d063d709 | 465 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 466 | */ |
d9800920 | 467 | static int send_kconsumerd_fds(struct ltt_kernel_session *session) |
f3ed775e DG |
468 | { |
469 | int ret; | |
470 | struct ltt_kernel_channel *chan; | |
7a485870 DG |
471 | struct lttcomm_kconsumerd_header lkh; |
472 | struct lttcomm_kconsumerd_msg lkm; | |
473 | ||
474 | /* Setup header */ | |
475 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); | |
476 | lkh.cmd_type = ADD_STREAM; | |
477 | ||
478 | DBG("Sending kconsumerd header for metadata"); | |
479 | ||
d9800920 | 480 | ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh, sizeof(struct lttcomm_kconsumerd_header)); |
7a485870 DG |
481 | if (ret < 0) { |
482 | perror("send kconsumerd header"); | |
483 | goto error; | |
484 | } | |
485 | ||
486 | DBG("Sending metadata stream fd"); | |
487 | ||
d9800920 DG |
488 | /* Extra protection. It's NOT suppose to be set to 0 at this point */ |
489 | if (session->consumer_fd == 0) { | |
490 | session->consumer_fd = kconsumerd_cmd_sock; | |
491 | } | |
492 | ||
7a485870 DG |
493 | if (session->metadata_stream_fd != 0) { |
494 | /* Send metadata stream fd first */ | |
495 | lkm.fd = session->metadata_stream_fd; | |
496 | lkm.state = ACTIVE_FD; | |
497 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
8b270bdb | 498 | lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
7a485870 | 499 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); |
99497cd0 | 500 | lkm.path_name[PATH_MAX - 1] = '\0'; |
7a485870 | 501 | |
d9800920 | 502 | ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm, &lkm.fd, 1, sizeof(lkm)); |
7a485870 DG |
503 | if (ret < 0) { |
504 | perror("send kconsumerd fd"); | |
505 | goto error; | |
506 | } | |
507 | } | |
f3ed775e | 508 | |
f3ed775e | 509 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
d9800920 | 510 | ret = send_kconsumerd_channel_fds(session->consumer_fd, chan); |
f3ed775e | 511 | if (ret < 0) { |
7a485870 | 512 | goto error; |
f3ed775e DG |
513 | } |
514 | } | |
515 | ||
7a485870 DG |
516 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
517 | ||
f3ed775e DG |
518 | return 0; |
519 | ||
520 | error: | |
521 | return ret; | |
522 | } | |
523 | ||
fac6795d | 524 | /* |
0fdd1e2c | 525 | * Notify UST applications using the shm mmap futex. |
fac6795d | 526 | */ |
0fdd1e2c | 527 | static int notify_ust_apps(int active) |
fac6795d | 528 | { |
0fdd1e2c | 529 | char *wait_shm_mmap; |
fac6795d | 530 | |
0fdd1e2c | 531 | DBG("Notifying applications of session daemon state: %d", active); |
fac6795d | 532 | |
62d53818 DG |
533 | tracepoint(ust_notify_apps_start); |
534 | ||
0fdd1e2c DG |
535 | /* See shm.c for this call implying mmap, shm and futex calls */ |
536 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
537 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
538 | goto error; |
539 | } | |
540 | ||
0fdd1e2c DG |
541 | /* Wake waiting process */ |
542 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
543 | ||
62d53818 DG |
544 | tracepoint(ust_notify_apps_stop); |
545 | ||
0fdd1e2c DG |
546 | /* Apps notified successfully */ |
547 | return 0; | |
fac6795d DG |
548 | |
549 | error: | |
0fdd1e2c | 550 | return -1; |
fac6795d DG |
551 | } |
552 | ||
e065084a | 553 | /* |
d063d709 DG |
554 | * Setup the outgoing data buffer for the response (llm) by allocating the |
555 | * right amount of memory and copying the original information from the lsm | |
556 | * structure. | |
ca95a216 | 557 | * |
d063d709 | 558 | * Return total size of the buffer pointed by buf. |
ca95a216 | 559 | */ |
5461b305 | 560 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 561 | { |
f3ed775e | 562 | int ret, buf_size; |
ca95a216 | 563 | |
f3ed775e | 564 | buf_size = size; |
5461b305 DG |
565 | |
566 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
567 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 568 | perror("malloc"); |
5461b305 | 569 | ret = -ENOMEM; |
ca95a216 DG |
570 | goto error; |
571 | } | |
572 | ||
5461b305 DG |
573 | /* Copy common data */ |
574 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 575 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 576 | |
5461b305 DG |
577 | cmd_ctx->llm->data_size = size; |
578 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
579 | ||
ca95a216 DG |
580 | return buf_size; |
581 | ||
582 | error: | |
583 | return ret; | |
584 | } | |
585 | ||
7a485870 | 586 | /* |
5eb91c98 | 587 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 588 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 589 | */ |
5eb91c98 | 590 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 591 | { |
5eb91c98 | 592 | int ret; |
7a485870 DG |
593 | struct ltt_session *session; |
594 | struct ltt_kernel_channel *channel; | |
595 | ||
5eb91c98 | 596 | DBG("Updating kernel poll set"); |
7a485870 | 597 | |
6c9cc2ab | 598 | lock_session_list(); |
b5541356 DG |
599 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
600 | lock_session(session); | |
7a485870 | 601 | if (session->kernel_session == NULL) { |
b5541356 | 602 | unlock_session(session); |
7a485870 DG |
603 | continue; |
604 | } | |
7a485870 | 605 | |
7a485870 | 606 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { |
5eb91c98 DG |
607 | /* Add channel fd to the kernel poll set */ |
608 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
609 | if (ret < 0) { | |
610 | unlock_session(session); | |
611 | goto error; | |
612 | } | |
613 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 614 | } |
b5541356 | 615 | unlock_session(session); |
7a485870 | 616 | } |
6c9cc2ab | 617 | unlock_session_list(); |
7a485870 | 618 | |
5eb91c98 | 619 | return 0; |
7a485870 DG |
620 | |
621 | error: | |
6c9cc2ab | 622 | unlock_session_list(); |
7a485870 DG |
623 | return -1; |
624 | } | |
625 | ||
626 | /* | |
d063d709 DG |
627 | * Find the channel fd from 'fd' over all tracing session. When found, check |
628 | * for new channel stream and send those stream fds to the kernel consumer. | |
7a485870 | 629 | * |
d063d709 | 630 | * Useful for CPU hotplug feature. |
7a485870 DG |
631 | */ |
632 | static int update_kernel_stream(int fd) | |
633 | { | |
634 | int ret = 0; | |
635 | struct ltt_session *session; | |
636 | struct ltt_kernel_channel *channel; | |
637 | ||
638 | DBG("Updating kernel streams for channel fd %d", fd); | |
639 | ||
6c9cc2ab | 640 | lock_session_list(); |
b5541356 DG |
641 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
642 | lock_session(session); | |
7a485870 | 643 | if (session->kernel_session == NULL) { |
b5541356 | 644 | unlock_session(session); |
7a485870 DG |
645 | continue; |
646 | } | |
d9800920 DG |
647 | |
648 | /* This is not suppose to be 0 but this is an extra security check */ | |
649 | if (session->kernel_session->consumer_fd == 0) { | |
650 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
651 | } | |
652 | ||
5eb91c98 DG |
653 | cds_list_for_each_entry(channel, |
654 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
655 | if (channel->fd == fd) { |
656 | DBG("Channel found, updating kernel streams"); | |
657 | ret = kernel_open_channel_stream(channel); | |
658 | if (ret < 0) { | |
b3c750d2 | 659 | goto error; |
7a485870 | 660 | } |
d9800920 | 661 | |
7a485870 | 662 | /* |
5eb91c98 DG |
663 | * Have we already sent fds to the consumer? If yes, it means |
664 | * that tracing is started so it is safe to send our updated | |
665 | * stream fds. | |
7a485870 DG |
666 | */ |
667 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
5eb91c98 DG |
668 | ret = send_kconsumerd_channel_fds( |
669 | session->kernel_session->consumer_fd, channel); | |
7a485870 | 670 | if (ret < 0) { |
b3c750d2 | 671 | goto error; |
7a485870 DG |
672 | } |
673 | } | |
b3c750d2 | 674 | goto error; |
7a485870 DG |
675 | } |
676 | } | |
b5541356 | 677 | unlock_session(session); |
7a485870 | 678 | } |
b3c750d2 MD |
679 | unlock_session_list(); |
680 | return ret; | |
7a485870 | 681 | |
b3c750d2 MD |
682 | error: |
683 | unlock_session(session); | |
6c9cc2ab | 684 | unlock_session_list(); |
7a485870 DG |
685 | return ret; |
686 | } | |
687 | ||
688 | /* | |
d063d709 | 689 | * This thread manage event coming from the kernel. |
7a485870 | 690 | * |
d063d709 DG |
691 | * Features supported in this thread: |
692 | * -) CPU Hotplug | |
7a485870 DG |
693 | */ |
694 | static void *thread_manage_kernel(void *data) | |
695 | { | |
5eb91c98 DG |
696 | int ret, i, pollfd, update_poll_flag = 1; |
697 | uint32_t revents, nb_fd; | |
7a485870 | 698 | char tmp; |
5eb91c98 | 699 | struct lttng_poll_event events; |
7a485870 | 700 | |
b25a8868 DG |
701 | tracepoint(sessiond_th_kern_start); |
702 | ||
7a485870 DG |
703 | DBG("Thread manage kernel started"); |
704 | ||
5eb91c98 DG |
705 | ret = create_thread_poll_set(&events, 2); |
706 | if (ret < 0) { | |
707 | goto error; | |
708 | } | |
709 | ||
710 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
711 | if (ret < 0) { | |
712 | goto error; | |
713 | } | |
714 | ||
7a485870 DG |
715 | while (1) { |
716 | if (update_poll_flag == 1) { | |
5eb91c98 DG |
717 | ret = update_kernel_poll(&events); |
718 | if (ret < 0) { | |
7a485870 DG |
719 | goto error; |
720 | } | |
721 | update_poll_flag = 0; | |
722 | } | |
723 | ||
5eb91c98 DG |
724 | nb_fd = LTTNG_POLL_GETNB(&events); |
725 | ||
726 | DBG("Thread kernel polling on %d fds", nb_fd); | |
727 | ||
728 | /* Zeroed the poll events */ | |
729 | lttng_poll_reset(&events); | |
7a485870 | 730 | |
b25a8868 DG |
731 | tracepoint(sessiond_th_kern_poll); |
732 | ||
7a485870 | 733 | /* Poll infinite value of time */ |
5eb91c98 | 734 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 735 | if (ret < 0) { |
7a485870 DG |
736 | goto error; |
737 | } else if (ret == 0) { | |
738 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
739 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
740 | "This should not have happened! Continuing..."); | |
7a485870 DG |
741 | continue; |
742 | } | |
743 | ||
5eb91c98 DG |
744 | for (i = 0; i < nb_fd; i++) { |
745 | /* Fetch once the poll data */ | |
746 | revents = LTTNG_POLL_GETEV(&events, i); | |
747 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 748 | |
5eb91c98 DG |
749 | /* Thread quit pipe has been closed. Killing thread. */ |
750 | ret = check_thread_quit_pipe(pollfd, revents); | |
751 | if (ret) { | |
752 | goto error; | |
753 | } | |
7a485870 | 754 | |
5eb91c98 DG |
755 | /* Check for data on kernel pipe */ |
756 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
757 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
758 | update_poll_flag = 1; | |
759 | continue; | |
760 | } else { | |
761 | /* | |
762 | * New CPU detected by the kernel. Adding kernel stream to | |
763 | * kernel session and updating the kernel consumer | |
764 | */ | |
765 | if (revents & LPOLLIN) { | |
766 | ret = update_kernel_stream(pollfd); | |
767 | if (ret < 0) { | |
768 | continue; | |
769 | } | |
770 | break; | |
771 | /* | |
772 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
773 | * and unregister kernel stream at this point. | |
774 | */ | |
7a485870 | 775 | } |
7a485870 DG |
776 | } |
777 | } | |
778 | } | |
779 | ||
780 | error: | |
781 | DBG("Kernel thread dying"); | |
273ea72c DG |
782 | close(kernel_poll_pipe[0]); |
783 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
784 | |
785 | lttng_poll_clean(&events); | |
786 | ||
7a485870 DG |
787 | return NULL; |
788 | } | |
789 | ||
1d4b027a | 790 | /* |
d063d709 | 791 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
792 | */ |
793 | static void *thread_manage_kconsumerd(void *data) | |
794 | { | |
5eb91c98 DG |
795 | int sock = 0, i, ret, pollfd; |
796 | uint32_t revents, nb_fd; | |
1d4b027a | 797 | enum lttcomm_return_code code; |
5eb91c98 | 798 | struct lttng_poll_event events; |
1d4b027a | 799 | |
b25a8868 DG |
800 | tracepoint(sessiond_th_kcon_start); |
801 | ||
1d4b027a DG |
802 | DBG("[thread] Manage kconsumerd started"); |
803 | ||
804 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
805 | if (ret < 0) { | |
806 | goto error; | |
807 | } | |
808 | ||
5eb91c98 DG |
809 | /* |
810 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
811 | * Nothing more will be added to this poll set. | |
812 | */ | |
813 | ret = create_thread_poll_set(&events, 2); | |
814 | if (ret < 0) { | |
815 | goto error; | |
816 | } | |
273ea72c | 817 | |
5eb91c98 DG |
818 | ret = lttng_poll_add(&events, kconsumerd_err_sock, LPOLLIN | LPOLLRDHUP); |
819 | if (ret < 0) { | |
820 | goto error; | |
821 | } | |
273ea72c | 822 | |
5eb91c98 | 823 | nb_fd = LTTNG_POLL_GETNB(&events); |
273ea72c | 824 | |
b25a8868 DG |
825 | tracepoint(sessiond_th_kcon_poll); |
826 | ||
273ea72c | 827 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 828 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 829 | if (ret < 0) { |
273ea72c DG |
830 | goto error; |
831 | } | |
832 | ||
5eb91c98 DG |
833 | for (i = 0; i < nb_fd; i++) { |
834 | /* Fetch once the poll data */ | |
835 | revents = LTTNG_POLL_GETEV(&events, i); | |
836 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
837 | ||
838 | /* Thread quit pipe has been closed. Killing thread. */ | |
839 | ret = check_thread_quit_pipe(pollfd, revents); | |
840 | if (ret) { | |
841 | goto error; | |
842 | } | |
843 | ||
844 | /* Event on the registration socket */ | |
845 | if (pollfd == kconsumerd_err_sock) { | |
846 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
847 | ERR("Kconsumerd err socket poll error"); | |
848 | goto error; | |
849 | } | |
850 | } | |
273ea72c DG |
851 | } |
852 | ||
1d4b027a DG |
853 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
854 | if (sock < 0) { | |
855 | goto error; | |
856 | } | |
857 | ||
712ea556 | 858 | /* Getting status code from kconsumerd */ |
1d4b027a DG |
859 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
860 | if (ret <= 0) { | |
861 | goto error; | |
862 | } | |
863 | ||
864 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
865 | kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
866 | if (kconsumerd_cmd_sock < 0) { | |
712ea556 | 867 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
868 | perror("kconsumerd connect"); |
869 | goto error; | |
870 | } | |
871 | /* Signal condition to tell that the kconsumerd is ready */ | |
872 | sem_post(&kconsumerd_sem); | |
873 | DBG("Kconsumerd command socket ready"); | |
874 | } else { | |
6f61d021 | 875 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
876 | lttcomm_get_readable_code(-code)); |
877 | goto error; | |
878 | } | |
879 | ||
5eb91c98 DG |
880 | /* Remove the kconsumerd error socket since we have established a connexion */ |
881 | ret = lttng_poll_del(&events, kconsumerd_err_sock); | |
72079cae | 882 | if (ret < 0) { |
72079cae DG |
883 | goto error; |
884 | } | |
885 | ||
5eb91c98 DG |
886 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
887 | if (ret < 0) { | |
72079cae | 888 | goto error; |
5eb91c98 DG |
889 | } |
890 | ||
891 | /* Update number of fd */ | |
892 | nb_fd = LTTNG_POLL_GETNB(&events); | |
893 | ||
894 | /* Inifinite blocking call, waiting for transmission */ | |
895 | ret = lttng_poll_wait(&events, -1); | |
896 | if (ret < 0) { | |
72079cae DG |
897 | goto error; |
898 | } | |
899 | ||
5eb91c98 DG |
900 | for (i = 0; i < nb_fd; i++) { |
901 | /* Fetch once the poll data */ | |
902 | revents = LTTNG_POLL_GETEV(&events, i); | |
903 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
904 | ||
905 | /* Thread quit pipe has been closed. Killing thread. */ | |
906 | ret = check_thread_quit_pipe(pollfd, revents); | |
907 | if (ret) { | |
908 | goto error; | |
909 | } | |
910 | ||
911 | /* Event on the kconsumerd socket */ | |
912 | if (pollfd == sock) { | |
913 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
914 | ERR("Kconsumerd err socket second poll error"); | |
915 | goto error; | |
916 | } | |
917 | } | |
918 | } | |
919 | ||
712ea556 DG |
920 | /* Wait for any kconsumerd error */ |
921 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); | |
922 | if (ret <= 0) { | |
923 | ERR("Kconsumerd closed the command socket"); | |
924 | goto error; | |
6f61d021 | 925 | } |
1d4b027a | 926 | |
712ea556 DG |
927 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
928 | ||
1d4b027a | 929 | error: |
6f61d021 | 930 | DBG("Kconsumerd thread dying"); |
5eb91c98 DG |
931 | close(kconsumerd_err_sock); |
932 | close(kconsumerd_cmd_sock); | |
933 | close(sock); | |
273ea72c DG |
934 | |
935 | unlink(kconsumerd_err_unix_sock_path); | |
936 | unlink(kconsumerd_cmd_unix_sock_path); | |
273ea72c | 937 | kconsumerd_pid = 0; |
0177d773 | 938 | |
5eb91c98 | 939 | lttng_poll_clean(&events); |
0177d773 | 940 | |
5eb91c98 | 941 | return NULL; |
099e26bd DG |
942 | } |
943 | ||
099e26bd DG |
944 | /* |
945 | * This thread manage application communication. | |
1d4b027a DG |
946 | */ |
947 | static void *thread_manage_apps(void *data) | |
099e26bd | 948 | { |
5eb91c98 DG |
949 | int i, ret, pollfd; |
950 | uint32_t revents, nb_fd; | |
099e26bd | 951 | struct ust_command ust_cmd; |
5eb91c98 | 952 | struct lttng_poll_event events; |
099e26bd | 953 | |
85c434ee DG |
954 | tracepoint(sessiond_th_apps_start); |
955 | ||
099e26bd DG |
956 | DBG("[thread] Manage application started"); |
957 | ||
5eb91c98 DG |
958 | ret = create_thread_poll_set(&events, 2); |
959 | if (ret < 0) { | |
960 | goto error; | |
961 | } | |
099e26bd | 962 | |
5eb91c98 DG |
963 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
964 | if (ret < 0) { | |
965 | goto error; | |
966 | } | |
099e26bd | 967 | |
5eb91c98 DG |
968 | while (1) { |
969 | /* Zeroed the events structure */ | |
970 | lttng_poll_reset(&events); | |
0177d773 | 971 | |
5eb91c98 | 972 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
973 | |
974 | DBG("Apps thread polling on %d fds", nb_fd); | |
975 | ||
85c434ee DG |
976 | tracepoint(sessiond_th_apps_poll); |
977 | ||
099e26bd | 978 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 979 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 980 | if (ret < 0) { |
099e26bd DG |
981 | goto error; |
982 | } | |
983 | ||
5eb91c98 DG |
984 | for (i = 0; i < nb_fd; i++) { |
985 | /* Fetch once the poll data */ | |
986 | revents = LTTNG_POLL_GETEV(&events, i); | |
987 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
988 | ||
989 | /* Thread quit pipe has been closed. Killing thread. */ | |
990 | ret = check_thread_quit_pipe(pollfd, revents); | |
991 | if (ret) { | |
099e26bd | 992 | goto error; |
5eb91c98 | 993 | } |
62d53818 | 994 | |
5eb91c98 DG |
995 | /* Inspect the apps cmd pipe */ |
996 | if (pollfd == apps_cmd_pipe[0]) { | |
997 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
998 | ERR("Apps command pipe error"); | |
0177d773 | 999 | goto error; |
5eb91c98 | 1000 | } else if (revents & LPOLLIN) { |
dab4c8a1 | 1001 | tracepoint(ust_register_read_start); |
5eb91c98 DG |
1002 | /* Empty pipe */ |
1003 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1004 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1005 | perror("read apps cmd pipe"); | |
1006 | goto error; | |
1007 | } | |
a89c7d1b | 1008 | tracepoint(ust_register_read_stop); |
099e26bd | 1009 | |
a89c7d1b | 1010 | tracepoint(ust_register_add_start); |
5eb91c98 DG |
1011 | /* Register applicaton to the session daemon */ |
1012 | ret = register_traceable_app(&ust_cmd.reg_msg, ust_cmd.sock); | |
1013 | if (ret < 0) { | |
1014 | /* Only critical ENOMEM error can be returned here */ | |
1015 | goto error; | |
1016 | } | |
a89c7d1b | 1017 | tracepoint(ust_register_add_stop); |
85c434ee | 1018 | |
a89c7d1b | 1019 | tracepoint(ust_register_done_start); |
5eb91c98 DG |
1020 | ret = ustctl_register_done(ust_cmd.sock); |
1021 | if (ret < 0) { | |
1022 | /* | |
1023 | * If the registration is not possible, we simply | |
1024 | * unregister the apps and continue | |
1025 | */ | |
1026 | unregister_traceable_app(ust_cmd.sock); | |
1027 | } else { | |
1028 | /* | |
1029 | * We just need here to monitor the close of the UST | |
1030 | * socket and poll set monitor those by default. | |
1031 | */ | |
1032 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1033 | if (ret < 0) { | |
1034 | goto error; | |
1035 | } | |
1036 | ||
1037 | DBG("Apps with sock %d added to poll set", ust_cmd.sock); | |
1038 | } | |
a89c7d1b | 1039 | tracepoint(ust_register_done_stop); |
5eb91c98 | 1040 | break; |
0177d773 | 1041 | } |
5eb91c98 DG |
1042 | } else { |
1043 | /* | |
1044 | * At this point, we know that a registered application made the | |
1045 | * event at poll_wait. | |
1046 | */ | |
1047 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1048 | /* Removing from the poll set */ | |
1049 | ret = lttng_poll_del(&events, pollfd); | |
1050 | if (ret < 0) { | |
1051 | goto error; | |
1052 | } | |
099e26bd | 1053 | |
5eb91c98 DG |
1054 | /* Socket closed */ |
1055 | unregister_traceable_app(pollfd); | |
1056 | break; | |
0177d773 | 1057 | } |
099e26bd DG |
1058 | } |
1059 | } | |
099e26bd DG |
1060 | } |
1061 | ||
1062 | error: | |
1063 | DBG("Application communication apps dying"); | |
1064 | close(apps_cmd_pipe[0]); | |
1065 | close(apps_cmd_pipe[1]); | |
1066 | ||
5eb91c98 | 1067 | lttng_poll_clean(&events); |
099e26bd DG |
1068 | |
1069 | return NULL; | |
1070 | } | |
1071 | ||
1072 | /* | |
1073 | * Dispatch request from the registration threads to the application | |
1074 | * communication thread. | |
1075 | */ | |
1076 | static void *thread_dispatch_ust_registration(void *data) | |
1077 | { | |
1078 | int ret; | |
1079 | struct cds_wfq_node *node; | |
1080 | struct ust_command *ust_cmd = NULL; | |
1081 | ||
85c434ee DG |
1082 | tracepoint(sessiond_th_dispatch_start); |
1083 | ||
099e26bd DG |
1084 | DBG("[thread] Dispatch UST command started"); |
1085 | ||
1086 | while (!dispatch_thread_exit) { | |
1087 | /* Atomically prepare the queue futex */ | |
1088 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1089 | ||
1090 | do { | |
85c434ee DG |
1091 | tracepoint(sessiond_th_dispatch_block); |
1092 | ||
099e26bd DG |
1093 | /* Dequeue command for registration */ |
1094 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1095 | if (node == NULL) { | |
1096 | DBG("Waked up but nothing in the UST command queue"); | |
1097 | /* Continue thread execution */ | |
1098 | break; | |
1099 | } | |
1100 | ||
62d53818 DG |
1101 | tracepoint(ust_dispatch_register_start); |
1102 | ||
099e26bd DG |
1103 | ust_cmd = caa_container_of(node, struct ust_command, node); |
1104 | ||
2f50c8a3 DG |
1105 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1106 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1107 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1108 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1109 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1110 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1111 | /* |
1112 | * Inform apps thread of the new application registration. This | |
1113 | * call is blocking so we can be assured that the data will be read | |
1114 | * at some point in time or wait to the end of the world :) | |
1115 | */ | |
1116 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1117 | sizeof(struct ust_command)); | |
1118 | if (ret < 0) { | |
1119 | perror("write apps cmd pipe"); | |
1120 | if (errno == EBADF) { | |
1121 | /* | |
1122 | * We can't inform the application thread to process | |
1123 | * registration. We will exit or else application | |
1124 | * registration will not occur and tracing will never | |
1125 | * start. | |
1126 | */ | |
1127 | goto error; | |
1128 | } | |
1129 | } | |
1130 | free(ust_cmd); | |
1131 | } while (node != NULL); | |
1132 | ||
62d53818 DG |
1133 | tracepoint(ust_dispatch_register_stop); |
1134 | ||
099e26bd DG |
1135 | /* Futex wait on queue. Blocking call on futex() */ |
1136 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1137 | } | |
1138 | ||
1139 | error: | |
1140 | DBG("Dispatch thread dying"); | |
1141 | return NULL; | |
1142 | } | |
1143 | ||
1144 | /* | |
1145 | * This thread manage application registration. | |
1146 | */ | |
1147 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1148 | { |
5eb91c98 DG |
1149 | int sock = 0, i, ret, pollfd; |
1150 | uint32_t revents, nb_fd; | |
1151 | struct lttng_poll_event events; | |
099e26bd DG |
1152 | /* |
1153 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1154 | * freed in the manage apps thread. | |
1155 | */ | |
1156 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1157 | |
62d53818 | 1158 | tracepoint(sessiond_th_reg_start); |
b25a8868 | 1159 | |
099e26bd | 1160 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1161 | |
1162 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1163 | if (ret < 0) { | |
1164 | goto error; | |
1165 | } | |
1166 | ||
5eb91c98 DG |
1167 | /* |
1168 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1169 | * more will be added to this poll set. | |
1170 | */ | |
1171 | ret = create_thread_poll_set(&events, 2); | |
1172 | if (ret < 0) { | |
1173 | goto error; | |
1174 | } | |
273ea72c | 1175 | |
5eb91c98 DG |
1176 | /* Add the application registration socket */ |
1177 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1178 | if (ret < 0) { | |
1179 | goto error; | |
1180 | } | |
273ea72c | 1181 | |
1d4b027a | 1182 | /* Notify all applications to register */ |
0fdd1e2c DG |
1183 | ret = notify_ust_apps(1); |
1184 | if (ret < 0) { | |
1185 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
1186 | "Execution continues but there might be problem for already running\n" | |
1187 | "applications that wishes to register."); | |
1188 | } | |
1d4b027a DG |
1189 | |
1190 | while (1) { | |
1191 | DBG("Accepting application registration"); | |
273ea72c | 1192 | |
62d53818 | 1193 | tracepoint(sessiond_th_reg_poll); |
b25a8868 | 1194 | |
5eb91c98 DG |
1195 | nb_fd = LTTNG_POLL_GETNB(&events); |
1196 | ||
273ea72c | 1197 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1198 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1199 | if (ret < 0) { |
273ea72c DG |
1200 | goto error; |
1201 | } | |
1202 | ||
5eb91c98 DG |
1203 | for (i = 0; i < nb_fd; i++) { |
1204 | /* Fetch once the poll data */ | |
1205 | revents = LTTNG_POLL_GETEV(&events, i); | |
1206 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1207 | |
5eb91c98 DG |
1208 | /* Thread quit pipe has been closed. Killing thread. */ |
1209 | ret = check_thread_quit_pipe(pollfd, revents); | |
1210 | if (ret) { | |
90014c57 DG |
1211 | goto error; |
1212 | } | |
62d53818 | 1213 | |
5eb91c98 DG |
1214 | /* Event on the registration socket */ |
1215 | if (pollfd == apps_sock) { | |
1216 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1217 | ERR("Register apps socket poll error"); | |
1218 | goto error; | |
1219 | } else if (revents & LPOLLIN) { | |
dab4c8a1 DG |
1220 | /* Registration starts here. Recording cycles */ |
1221 | tracepoint(ust_register_start); | |
1d4b027a | 1222 | |
5eb91c98 DG |
1223 | sock = lttcomm_accept_unix_sock(apps_sock); |
1224 | if (sock < 0) { | |
1225 | goto error; | |
1226 | } | |
099e26bd | 1227 | |
5eb91c98 DG |
1228 | /* Create UST registration command for enqueuing */ |
1229 | ust_cmd = malloc(sizeof(struct ust_command)); | |
1230 | if (ust_cmd == NULL) { | |
1231 | perror("ust command malloc"); | |
1232 | goto error; | |
1233 | } | |
1d4b027a | 1234 | |
5eb91c98 DG |
1235 | /* |
1236 | * Using message-based transmissions to ensure we don't | |
1237 | * have to deal with partially received messages. | |
1238 | */ | |
1239 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1240 | sizeof(struct ust_register_msg)); | |
1241 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1242 | if (ret < 0) { | |
1243 | perror("lttcomm_recv_unix_sock register apps"); | |
1244 | } else { | |
1245 | ERR("Wrong size received on apps register"); | |
1246 | } | |
1247 | free(ust_cmd); | |
1248 | close(sock); | |
1249 | continue; | |
1250 | } | |
099e26bd | 1251 | |
5eb91c98 | 1252 | ust_cmd->sock = sock; |
099e26bd | 1253 | |
5eb91c98 DG |
1254 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1255 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1256 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1257 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1258 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1259 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
1260 | /* | |
1261 | * Lock free enqueue the registration request. The red pill | |
1262 | * has been taken! This apps will be part of the *system* :) | |
1263 | */ | |
1264 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
62d53818 | 1265 | |
5eb91c98 DG |
1266 | /* |
1267 | * Wake the registration queue futex. Implicit memory | |
1268 | * barrier with the exchange in cds_wfq_enqueue. | |
1269 | */ | |
1270 | futex_nto1_wake(&ust_cmd_queue.futex); | |
dab4c8a1 DG |
1271 | |
1272 | tracepoint(ust_register_stop); | |
5eb91c98 DG |
1273 | } |
1274 | } | |
90014c57 | 1275 | } |
1d4b027a DG |
1276 | } |
1277 | ||
1278 | error: | |
0fdd1e2c DG |
1279 | DBG("UST Registration thread dying"); |
1280 | ||
1281 | /* Notify that the registration thread is gone */ | |
1282 | notify_ust_apps(0); | |
1283 | ||
1284 | close(apps_sock); | |
1285 | close(sock); | |
273ea72c | 1286 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1287 | |
5eb91c98 DG |
1288 | lttng_poll_clean(&events); |
1289 | ||
1d4b027a DG |
1290 | return NULL; |
1291 | } | |
1292 | ||
8c0faa1d | 1293 | /* |
d063d709 DG |
1294 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
1295 | * exec or it will fails. | |
8c0faa1d | 1296 | */ |
693bd40b | 1297 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
1298 | { |
1299 | int ret; | |
1300 | ||
1301 | /* Setup semaphore */ | |
1302 | sem_init(&kconsumerd_sem, 0, 0); | |
1303 | ||
1d4b027a | 1304 | ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); |
8c0faa1d DG |
1305 | if (ret != 0) { |
1306 | perror("pthread_create kconsumerd"); | |
1307 | goto error; | |
1308 | } | |
1309 | ||
693bd40b | 1310 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
1311 | sem_wait(&kconsumerd_sem); |
1312 | ||
712ea556 DG |
1313 | if (kconsumerd_pid == 0) { |
1314 | ERR("Kconsumerd did not start"); | |
1315 | goto error; | |
1316 | } | |
1317 | ||
8c0faa1d DG |
1318 | return 0; |
1319 | ||
1320 | error: | |
712ea556 | 1321 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
1322 | return ret; |
1323 | } | |
1324 | ||
d9800920 DG |
1325 | /* |
1326 | * Join kernel consumer thread | |
1327 | */ | |
cf3af59e MD |
1328 | static int join_kconsumerd_thread(void) |
1329 | { | |
1330 | void *status; | |
1331 | int ret; | |
1332 | ||
1333 | if (kconsumerd_pid != 0) { | |
1334 | ret = kill(kconsumerd_pid, SIGTERM); | |
1335 | if (ret) { | |
1336 | ERR("Error killing kconsumerd"); | |
1337 | return ret; | |
1338 | } | |
1339 | return pthread_join(kconsumerd_thread, &status); | |
1340 | } else { | |
1341 | return 0; | |
1342 | } | |
1343 | } | |
1344 | ||
8c0faa1d | 1345 | /* |
d063d709 | 1346 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 1347 | * |
d063d709 | 1348 | * Return pid if successful else -1. |
8c0faa1d | 1349 | */ |
693bd40b | 1350 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
1351 | { |
1352 | int ret; | |
1353 | pid_t pid; | |
53086306 | 1354 | const char *verbosity; |
8c0faa1d | 1355 | |
c49dc785 DG |
1356 | DBG("Spawning kconsumerd"); |
1357 | ||
8c0faa1d DG |
1358 | pid = fork(); |
1359 | if (pid == 0) { | |
1360 | /* | |
1361 | * Exec kconsumerd. | |
1362 | */ | |
31f73cc9 | 1363 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
53086306 DG |
1364 | verbosity = "--verbose"; |
1365 | } else { | |
1366 | verbosity = "--quiet"; | |
1367 | } | |
1368 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
1369 | if (errno != 0) { |
1370 | perror("kernel start consumer exec"); | |
1371 | } | |
1372 | exit(EXIT_FAILURE); | |
1373 | } else if (pid > 0) { | |
1374 | ret = pid; | |
1375 | goto error; | |
1376 | } else { | |
1377 | perror("kernel start consumer fork"); | |
1378 | ret = -errno; | |
1379 | goto error; | |
1380 | } | |
1381 | ||
1382 | error: | |
1383 | return ret; | |
1384 | } | |
1385 | ||
693bd40b | 1386 | /* |
d063d709 | 1387 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
1388 | */ |
1389 | static int start_kconsumerd(void) | |
1390 | { | |
1391 | int ret; | |
1392 | ||
693bd40b | 1393 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 1394 | if (kconsumerd_pid != 0) { |
817153bb | 1395 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
1396 | goto end; |
1397 | } | |
693bd40b | 1398 | |
c49dc785 DG |
1399 | ret = spawn_kconsumerd(); |
1400 | if (ret < 0) { | |
1401 | ERR("Spawning kconsumerd failed"); | |
1402 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1403 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
1404 | goto error; | |
693bd40b | 1405 | } |
c49dc785 DG |
1406 | |
1407 | /* Setting up the global kconsumerd_pid */ | |
1408 | kconsumerd_pid = ret; | |
693bd40b DG |
1409 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
1410 | ||
6f61d021 DG |
1411 | DBG("Kconsumerd pid %d", ret); |
1412 | ||
693bd40b | 1413 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
1414 | ret = spawn_kconsumerd_thread(); |
1415 | if (ret < 0) { | |
1416 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
1417 | goto error; |
1418 | } | |
1419 | ||
c49dc785 | 1420 | end: |
693bd40b DG |
1421 | return 0; |
1422 | ||
1423 | error: | |
1424 | return ret; | |
1425 | } | |
1426 | ||
b73401da | 1427 | /* |
d063d709 | 1428 | * modprobe_kernel_modules |
b73401da DG |
1429 | */ |
1430 | static int modprobe_kernel_modules(void) | |
1431 | { | |
ab147185 | 1432 | int ret = 0, i; |
b73401da DG |
1433 | char modprobe[256]; |
1434 | ||
ab147185 MD |
1435 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1436 | ret = snprintf(modprobe, sizeof(modprobe), | |
1437 | "/sbin/modprobe %s%s", | |
1438 | kernel_modules_list[i].required ? "" : "--quiet ", | |
1439 | kernel_modules_list[i].name); | |
b73401da DG |
1440 | if (ret < 0) { |
1441 | perror("snprintf modprobe"); | |
1442 | goto error; | |
1443 | } | |
ab147185 | 1444 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1445 | ret = system(modprobe); |
ab147185 MD |
1446 | if (ret == -1) { |
1447 | ERR("Unable to launch modprobe for module %s", | |
1448 | kernel_modules_list[i].name); | |
1449 | } else if (kernel_modules_list[i].required | |
d9800920 | 1450 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1451 | ERR("Unable to load module %s", |
1452 | kernel_modules_list[i].name); | |
1453 | } else { | |
1454 | DBG("Modprobe successfully %s", | |
1455 | kernel_modules_list[i].name); | |
1456 | } | |
1457 | } | |
1458 | ||
1459 | error: | |
1460 | return ret; | |
1461 | } | |
1462 | ||
b73401da | 1463 | /* |
d063d709 | 1464 | * mount_debugfs |
b73401da DG |
1465 | */ |
1466 | static int mount_debugfs(char *path) | |
1467 | { | |
1468 | int ret; | |
1469 | char *type = "debugfs"; | |
1470 | ||
996b65c8 | 1471 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da DG |
1472 | if (ret < 0) { |
1473 | goto error; | |
1474 | } | |
1475 | ||
1476 | ret = mount(type, path, type, 0, NULL); | |
1477 | if (ret < 0) { | |
1478 | perror("mount debugfs"); | |
1479 | goto error; | |
1480 | } | |
1481 | ||
1482 | DBG("Mounted debugfs successfully at %s", path); | |
1483 | ||
1484 | error: | |
1485 | return ret; | |
1486 | } | |
1487 | ||
8c0faa1d | 1488 | /* |
d063d709 | 1489 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1490 | */ |
f3ed775e | 1491 | static void init_kernel_tracer(void) |
8c0faa1d | 1492 | { |
b73401da DG |
1493 | int ret; |
1494 | char *proc_mounts = "/proc/mounts"; | |
1495 | char line[256]; | |
1496 | char *debugfs_path = NULL, *lttng_path; | |
1497 | FILE *fp; | |
1498 | ||
1499 | /* Detect debugfs */ | |
1500 | fp = fopen(proc_mounts, "r"); | |
1501 | if (fp == NULL) { | |
1502 | ERR("Unable to probe %s", proc_mounts); | |
1503 | goto error; | |
1504 | } | |
1505 | ||
1506 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1507 | if (strstr(line, "debugfs") != NULL) { | |
1508 | /* Remove first string */ | |
1509 | strtok(line, " "); | |
1510 | /* Dup string here so we can reuse line later on */ | |
1511 | debugfs_path = strdup(strtok(NULL, " ")); | |
1512 | DBG("Got debugfs path : %s", debugfs_path); | |
1513 | break; | |
1514 | } | |
1515 | } | |
1516 | ||
1517 | fclose(fp); | |
1518 | ||
1519 | /* Mount debugfs if needded */ | |
1520 | if (debugfs_path == NULL) { | |
1521 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1522 | if (ret < 0) { | |
1523 | perror("asprintf debugfs path"); | |
1524 | goto error; | |
1525 | } | |
1526 | ret = mount_debugfs(debugfs_path); | |
1527 | if (ret < 0) { | |
1528 | goto error; | |
1529 | } | |
1530 | } | |
1531 | ||
1532 | /* Modprobe lttng kernel modules */ | |
1533 | ret = modprobe_kernel_modules(); | |
1534 | if (ret < 0) { | |
1535 | goto error; | |
1536 | } | |
1537 | ||
1538 | /* Setup lttng kernel path */ | |
1539 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1540 | if (ret < 0) { | |
1541 | perror("asprintf lttng path"); | |
1542 | goto error; | |
1543 | } | |
1544 | ||
1545 | /* Open debugfs lttng */ | |
1546 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1547 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1548 | DBG("Failed to open %s", lttng_path); |
1549 | goto error; | |
8c0faa1d DG |
1550 | } |
1551 | ||
b73401da DG |
1552 | free(lttng_path); |
1553 | free(debugfs_path); | |
f3ed775e | 1554 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1555 | return; |
1556 | ||
1557 | error: | |
1558 | if (lttng_path) { | |
1559 | free(lttng_path); | |
1560 | } | |
1561 | if (debugfs_path) { | |
1562 | free(debugfs_path); | |
1563 | } | |
1564 | WARN("No kernel tracer available"); | |
1565 | kernel_tracer_fd = 0; | |
1566 | return; | |
f3ed775e | 1567 | } |
33a2b854 | 1568 | |
f3ed775e | 1569 | /* |
d063d709 DG |
1570 | * Start tracing by creating trace directory and sending FDs to the kernel |
1571 | * consumer. | |
f3ed775e DG |
1572 | */ |
1573 | static int start_kernel_trace(struct ltt_kernel_session *session) | |
1574 | { | |
f40799e8 | 1575 | int ret = 0; |
8c0faa1d | 1576 | |
f3ed775e | 1577 | if (session->kconsumer_fds_sent == 0) { |
d9800920 DG |
1578 | /* |
1579 | * Assign default kernel consumer if no consumer assigned to the kernel | |
1580 | * session. At this point, it's NOT suppose to be 0 but this is an extra | |
1581 | * security check. | |
1582 | */ | |
1583 | if (session->consumer_fd == 0) { | |
1584 | session->consumer_fd = kconsumerd_cmd_sock; | |
1585 | } | |
1586 | ||
1587 | ret = send_kconsumerd_fds(session); | |
f3ed775e DG |
1588 | if (ret < 0) { |
1589 | ERR("Send kconsumerd fds failed"); | |
1590 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1591 | goto error; | |
1592 | } | |
1d4b027a | 1593 | |
f3ed775e DG |
1594 | session->kconsumer_fds_sent = 1; |
1595 | } | |
1d4b027a DG |
1596 | |
1597 | error: | |
1598 | return ret; | |
8c0faa1d DG |
1599 | } |
1600 | ||
7a485870 | 1601 | /* |
5eb91c98 | 1602 | * Notify kernel thread to update it's poll set. |
7a485870 | 1603 | */ |
5eb91c98 | 1604 | static int notify_kernel_channels_update(void) |
7a485870 DG |
1605 | { |
1606 | int ret; | |
1607 | ||
1608 | /* Inform kernel thread of the new kernel channel */ | |
1609 | ret = write(kernel_poll_pipe[1], "!", 1); | |
1610 | if (ret < 0) { | |
1611 | perror("write kernel poll pipe"); | |
1612 | } | |
1613 | ||
1614 | return ret; | |
1615 | } | |
1616 | ||
8c0faa1d | 1617 | /* |
d063d709 | 1618 | * Allocate a channel structure and fill it. |
8c0faa1d | 1619 | */ |
b389abbe MD |
1620 | static struct lttng_channel *init_default_channel(enum lttng_domain_type domain_type, |
1621 | char *name) | |
8c0faa1d | 1622 | { |
f3ed775e | 1623 | struct lttng_channel *chan; |
1d4b027a | 1624 | |
f3ed775e DG |
1625 | chan = malloc(sizeof(struct lttng_channel)); |
1626 | if (chan == NULL) { | |
1627 | perror("init channel malloc"); | |
1628 | goto error; | |
8c0faa1d | 1629 | } |
1d4b027a | 1630 | |
ed8f384d | 1631 | if (snprintf(chan->name, NAME_MAX, "%s", name) < 0) { |
9f19cc17 | 1632 | perror("snprintf channel name"); |
b389abbe | 1633 | goto error; |
f3ed775e DG |
1634 | } |
1635 | ||
1636 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
f3ed775e DG |
1637 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
1638 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
1d4b027a | 1639 | |
b389abbe MD |
1640 | switch (domain_type) { |
1641 | case LTTNG_DOMAIN_KERNEL: | |
1642 | chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE; | |
1643 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; | |
1644 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1645 | break; | |
1646 | /* TODO: add UST */ | |
1647 | default: | |
1648 | goto error; /* Not implemented */ | |
1649 | } | |
1650 | ||
f3ed775e | 1651 | return chan; |
b389abbe MD |
1652 | |
1653 | error: | |
1654 | free(chan); | |
1655 | return NULL; | |
8c0faa1d DG |
1656 | } |
1657 | ||
0177d773 DG |
1658 | /* |
1659 | * Create an UST session and add it to the session ust list. | |
1660 | */ | |
1661 | static int create_ust_session(pid_t pid, struct ltt_session *session) | |
1662 | { | |
1663 | int ret = -1; | |
1664 | struct ltt_ust_session *lus; | |
1665 | ||
1666 | DBG("Creating UST session"); | |
1667 | ||
1668 | lus = trace_ust_create_session(session->path, pid); | |
1669 | if (lus == NULL) { | |
1670 | goto error; | |
1671 | } | |
1672 | ||
1673 | ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG, | |
1674 | geteuid(), allowed_group()); | |
1675 | if (ret < 0) { | |
1676 | if (ret != -EEXIST) { | |
1677 | ERR("Trace directory creation error"); | |
1678 | goto error; | |
1679 | } | |
1680 | } | |
1681 | ||
1682 | /* Create session on the UST tracer */ | |
1683 | ret = ustctl_create_session(lus); | |
1684 | if (ret < 0) { | |
1685 | goto error; | |
1686 | } | |
1687 | ||
1688 | return 0; | |
1689 | ||
1690 | error: | |
1691 | free(lus); | |
1692 | return ret; | |
1693 | } | |
1694 | ||
333f285e | 1695 | /* |
d063d709 | 1696 | * Create a kernel tracer session then create the default channel. |
333f285e | 1697 | */ |
f3ed775e | 1698 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1699 | { |
f3ed775e | 1700 | int ret; |
f3ed775e DG |
1701 | |
1702 | DBG("Creating kernel session"); | |
1703 | ||
1704 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1705 | if (ret < 0) { | |
1706 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1707 | goto error; | |
333f285e DG |
1708 | } |
1709 | ||
d9800920 DG |
1710 | /* Set kernel consumer socket fd */ |
1711 | if (kconsumerd_cmd_sock) { | |
1712 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
1713 | } | |
1714 | ||
63053e7c DG |
1715 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1716 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1717 | if (ret < 0) { |
996b65c8 | 1718 | if (ret != -EEXIST) { |
7a485870 DG |
1719 | ERR("Trace directory creation error"); |
1720 | goto error; | |
1721 | } | |
1722 | } | |
1723 | ||
f3ed775e DG |
1724 | error: |
1725 | return ret; | |
333f285e DG |
1726 | } |
1727 | ||
6c9cc2ab DG |
1728 | /* |
1729 | * Using the session list, filled a lttng_session array to send back to the | |
1730 | * client for session listing. | |
1731 | * | |
1732 | * The session list lock MUST be acquired before calling this function. Use | |
1733 | * lock_session_list() and unlock_session_list(). | |
1734 | */ | |
1735 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1736 | { | |
1737 | int i = 0; | |
1738 | struct ltt_session *session; | |
1739 | ||
1740 | DBG("Getting all available session"); | |
1741 | /* | |
1742 | * Iterate over session list and append data after the control struct in | |
1743 | * the buffer. | |
1744 | */ | |
1745 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1746 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1747 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1748 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1749 | sessions[i].name[NAME_MAX - 1] = '\0'; |
6c9cc2ab DG |
1750 | i++; |
1751 | } | |
1752 | } | |
1753 | ||
9f19cc17 DG |
1754 | /* |
1755 | * Fill lttng_channel array of all channels. | |
1756 | */ | |
1757 | static void list_lttng_channels(struct ltt_session *session, | |
1758 | struct lttng_channel *channels) | |
1759 | { | |
1760 | int i = 0; | |
1761 | struct ltt_kernel_channel *kchan; | |
1762 | ||
1763 | DBG("Listing channels for session %s", session->name); | |
1764 | ||
1765 | /* Kernel channels */ | |
1766 | if (session->kernel_session != NULL) { | |
1767 | cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head, list) { | |
1768 | /* Copy lttng_channel struct to array */ | |
1769 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1770 | channels[i].enabled = kchan->enabled; | |
1771 | i++; | |
1772 | } | |
1773 | } | |
1774 | ||
1775 | /* TODO: Missing UST listing */ | |
1776 | } | |
1777 | ||
1778 | /* | |
1779 | * Fill lttng_event array of all events in the channel. | |
1780 | */ | |
1781 | static void list_lttng_events(struct ltt_kernel_channel *kchan, | |
1782 | struct lttng_event *events) | |
1783 | { | |
1784 | /* | |
1785 | * TODO: This is ONLY kernel. Need UST support. | |
1786 | */ | |
1787 | int i = 0; | |
1788 | struct ltt_kernel_event *event; | |
1789 | ||
1790 | DBG("Listing events for channel %s", kchan->channel->name); | |
1791 | ||
1792 | /* Kernel channels */ | |
1793 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
1794 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1795 | events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
9f19cc17 DG |
1796 | events[i].enabled = event->enabled; |
1797 | switch (event->event->instrumentation) { | |
1798 | case LTTNG_KERNEL_TRACEPOINT: | |
1799 | events[i].type = LTTNG_EVENT_TRACEPOINT; | |
1800 | break; | |
1801 | case LTTNG_KERNEL_KPROBE: | |
1802 | case LTTNG_KERNEL_KRETPROBE: | |
1803 | events[i].type = LTTNG_EVENT_PROBE; | |
1804 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, | |
1805 | sizeof(struct lttng_kernel_kprobe)); | |
1806 | break; | |
1807 | case LTTNG_KERNEL_FUNCTION: | |
1808 | events[i].type = LTTNG_EVENT_FUNCTION; | |
1809 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, | |
1810 | sizeof(struct lttng_kernel_function)); | |
1811 | break; | |
1812 | } | |
1813 | i++; | |
1814 | } | |
1815 | } | |
1816 | ||
fac6795d | 1817 | /* |
d063d709 DG |
1818 | * Process the command requested by the lttng client within the command |
1819 | * context structure. This function make sure that the return structure (llm) | |
1820 | * is set and ready for transmission before returning. | |
fac6795d | 1821 | * |
e065084a | 1822 | * Return any error encountered or 0 for success. |
fac6795d | 1823 | */ |
5461b305 | 1824 | static int process_client_msg(struct command_ctx *cmd_ctx) |
fac6795d | 1825 | { |
f40799e8 | 1826 | int ret = LTTCOMM_OK; |
fac6795d | 1827 | |
5461b305 | 1828 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
fac6795d | 1829 | |
63053e7c DG |
1830 | /* |
1831 | * Commands that DO NOT need a session. | |
1832 | */ | |
5461b305 | 1833 | switch (cmd_ctx->lsm->cmd_type) { |
5e16da05 MD |
1834 | case LTTNG_CREATE_SESSION: |
1835 | case LTTNG_LIST_SESSIONS: | |
052da939 | 1836 | case LTTNG_LIST_TRACEPOINTS: |
d0254c7c | 1837 | case LTTNG_CALIBRATE: |
5e16da05 MD |
1838 | break; |
1839 | default: | |
42abccdb DG |
1840 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
1841 | cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session.name); | |
5461b305 | 1842 | if (cmd_ctx->session == NULL) { |
f3ed775e | 1843 | /* If session name not found */ |
42abccdb | 1844 | if (cmd_ctx->lsm->session.name != NULL) { |
f3ed775e DG |
1845 | ret = LTTCOMM_SESS_NOT_FOUND; |
1846 | } else { /* If no session name specified */ | |
1847 | ret = LTTCOMM_SELECT_SESS; | |
1848 | } | |
5461b305 | 1849 | goto error; |
b5541356 DG |
1850 | } else { |
1851 | /* Acquire lock for the session */ | |
1852 | lock_session(cmd_ctx->session); | |
379473d2 | 1853 | } |
5e16da05 | 1854 | break; |
379473d2 DG |
1855 | } |
1856 | ||
f3ed775e | 1857 | /* |
d0254c7c | 1858 | * Check domain type for specific "pre-action". |
f3ed775e | 1859 | */ |
0d0c377a DG |
1860 | switch (cmd_ctx->lsm->domain.type) { |
1861 | case LTTNG_DOMAIN_KERNEL: | |
333f285e | 1862 | /* Kernel tracer check */ |
20fe2104 | 1863 | if (kernel_tracer_fd == 0) { |
333f285e DG |
1864 | init_kernel_tracer(); |
1865 | if (kernel_tracer_fd == 0) { | |
1866 | ret = LTTCOMM_KERN_NA; | |
1867 | goto error; | |
1868 | } | |
20fe2104 | 1869 | } |
f3ed775e | 1870 | /* Need a session for kernel command */ |
d0254c7c | 1871 | switch (cmd_ctx->lsm->cmd_type) { |
d9800920 | 1872 | case LTTNG_CALIBRATE: |
d0254c7c MD |
1873 | case LTTNG_CREATE_SESSION: |
1874 | case LTTNG_LIST_SESSIONS: | |
1875 | case LTTNG_LIST_TRACEPOINTS: | |
d0254c7c MD |
1876 | break; |
1877 | default: | |
1878 | if (cmd_ctx->session->kernel_session == NULL) { | |
1879 | ret = create_kernel_session(cmd_ctx->session); | |
f3ed775e | 1880 | if (ret < 0) { |
d0254c7c | 1881 | ret = LTTCOMM_KERN_SESS_FAIL; |
f3ed775e DG |
1882 | goto error; |
1883 | } | |
d0254c7c | 1884 | /* Start the kernel consumer daemon */ |
d9800920 DG |
1885 | if (kconsumerd_pid == 0 && |
1886 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
d0254c7c MD |
1887 | ret = start_kconsumerd(); |
1888 | if (ret < 0) { | |
1889 | goto error; | |
1890 | } | |
1891 | } | |
f3ed775e DG |
1892 | } |
1893 | } | |
0d0c377a | 1894 | break; |
0fdd1e2c DG |
1895 | case LTTNG_DOMAIN_UST_PID: |
1896 | break; | |
0d0c377a DG |
1897 | default: |
1898 | break; | |
20fe2104 DG |
1899 | } |
1900 | ||
fac6795d | 1901 | /* Process by command type */ |
5461b305 | 1902 | switch (cmd_ctx->lsm->cmd_type) { |
b579acd9 | 1903 | case LTTNG_ADD_CONTEXT: |
d65106b1 | 1904 | { |
b579acd9 | 1905 | struct lttng_kernel_context kctx; |
d65106b1 DG |
1906 | |
1907 | /* Setup lttng message with no payload */ | |
1908 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1909 | if (ret < 0) { | |
1910 | goto setup_error; | |
1911 | } | |
1912 | ||
b579acd9 DG |
1913 | switch (cmd_ctx->lsm->domain.type) { |
1914 | case LTTNG_DOMAIN_KERNEL: | |
1915 | /* Create Kernel context */ | |
1916 | kctx.ctx = cmd_ctx->lsm->u.context.ctx.ctx; | |
1917 | kctx.u.perf_counter.type = cmd_ctx->lsm->u.context.ctx.u.perf_counter.type; | |
1918 | kctx.u.perf_counter.config = cmd_ctx->lsm->u.context.ctx.u.perf_counter.config; | |
1919 | strncpy(kctx.u.perf_counter.name, | |
1920 | cmd_ctx->lsm->u.context.ctx.u.perf_counter.name, | |
1921 | LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1922 | kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
b579acd9 DG |
1923 | |
1924 | /* Add kernel context to kernel tracer. See context.c */ | |
1925 | ret = add_kernel_context(cmd_ctx->session->kernel_session, &kctx, | |
1926 | cmd_ctx->lsm->u.context.event_name, | |
1927 | cmd_ctx->lsm->u.context.channel_name); | |
1928 | if (ret != LTTCOMM_OK) { | |
d65106b1 DG |
1929 | goto error; |
1930 | } | |
b579acd9 DG |
1931 | break; |
1932 | default: | |
1933 | /* TODO: Userspace tracing */ | |
1934 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
0b97ec54 | 1935 | goto error; |
d65106b1 DG |
1936 | } |
1937 | ||
1938 | ret = LTTCOMM_OK; | |
1939 | break; | |
1940 | } | |
0b97ec54 | 1941 | case LTTNG_DISABLE_CHANNEL: |
26cc6b4e | 1942 | { |
0b97ec54 | 1943 | struct ltt_kernel_channel *kchan; |
26cc6b4e DG |
1944 | |
1945 | /* Setup lttng message with no payload */ | |
1946 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1947 | if (ret < 0) { | |
1948 | goto setup_error; | |
1949 | } | |
1950 | ||
0b97ec54 DG |
1951 | switch (cmd_ctx->lsm->domain.type) { |
1952 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1953 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
0b97ec54 DG |
1954 | cmd_ctx->session->kernel_session); |
1955 | if (kchan == NULL) { | |
1956 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
26cc6b4e | 1957 | goto error; |
0b97ec54 DG |
1958 | } else if (kchan->enabled == 1) { |
1959 | ret = kernel_disable_channel(kchan); | |
1960 | if (ret < 0) { | |
1961 | if (ret != EEXIST) { | |
1962 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
1963 | } | |
1964 | goto error; | |
1965 | } | |
26cc6b4e | 1966 | } |
0b97ec54 DG |
1967 | kernel_wait_quiescent(kernel_tracer_fd); |
1968 | break; | |
1969 | default: | |
1970 | /* TODO: Userspace tracing */ | |
1971 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1972 | goto error; | |
26cc6b4e DG |
1973 | } |
1974 | ||
26cc6b4e DG |
1975 | ret = LTTCOMM_OK; |
1976 | break; | |
1977 | } | |
f5177a38 | 1978 | case LTTNG_DISABLE_EVENT: |
e953ef25 | 1979 | { |
f5177a38 DG |
1980 | struct ltt_kernel_channel *kchan; |
1981 | struct ltt_kernel_event *kevent; | |
e953ef25 DG |
1982 | |
1983 | /* Setup lttng message with no payload */ | |
1984 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1985 | if (ret < 0) { | |
1986 | goto setup_error; | |
1987 | } | |
1988 | ||
f5177a38 DG |
1989 | switch (cmd_ctx->lsm->domain.type) { |
1990 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1991 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
f5177a38 DG |
1992 | cmd_ctx->session->kernel_session); |
1993 | if (kchan == NULL) { | |
1994 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
19e70852 | 1995 | goto error; |
e953ef25 | 1996 | } |
f5177a38 | 1997 | |
62499ad6 | 1998 | kevent = trace_kernel_get_event_by_name(cmd_ctx->lsm->u.disable.name, kchan); |
f5177a38 DG |
1999 | if (kevent != NULL) { |
2000 | DBG("Disabling kernel event %s for channel %s.", kevent->event->name, | |
2001 | kchan->channel->name); | |
2002 | ret = kernel_disable_event(kevent); | |
2003 | if (ret < 0) { | |
2004 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2005 | goto error; | |
2006 | } | |
2007 | } | |
2008 | ||
2009 | kernel_wait_quiescent(kernel_tracer_fd); | |
2010 | break; | |
2011 | default: | |
2012 | /* TODO: Userspace tracing */ | |
2013 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2014 | goto error; | |
e953ef25 DG |
2015 | } |
2016 | ||
19e70852 | 2017 | ret = LTTCOMM_OK; |
e953ef25 DG |
2018 | break; |
2019 | } | |
f5177a38 | 2020 | case LTTNG_DISABLE_ALL_EVENT: |
950131af | 2021 | { |
f5177a38 DG |
2022 | struct ltt_kernel_channel *kchan; |
2023 | struct ltt_kernel_event *kevent; | |
950131af DG |
2024 | |
2025 | /* Setup lttng message with no payload */ | |
2026 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2027 | if (ret < 0) { | |
2028 | goto setup_error; | |
2029 | } | |
2030 | ||
f5177a38 DG |
2031 | switch (cmd_ctx->lsm->domain.type) { |
2032 | case LTTNG_DOMAIN_KERNEL: | |
2033 | DBG("Disabling all enabled kernel events"); | |
62499ad6 | 2034 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
f5177a38 DG |
2035 | cmd_ctx->session->kernel_session); |
2036 | if (kchan == NULL) { | |
2037 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2038 | goto error; | |
2039 | } | |
950131af | 2040 | |
f5177a38 DG |
2041 | /* For each event in the kernel session */ |
2042 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
2043 | DBG("Disabling kernel event %s for channel %s.", | |
2044 | kevent->event->name, kchan->channel->name); | |
2045 | ret = kernel_disable_event(kevent); | |
2046 | if (ret < 0) { | |
2047 | continue; | |
2048 | } | |
950131af | 2049 | } |
f5177a38 DG |
2050 | |
2051 | /* Quiescent wait after event disable */ | |
2052 | kernel_wait_quiescent(kernel_tracer_fd); | |
2053 | break; | |
2054 | default: | |
2055 | /* TODO: Userspace tracing */ | |
2056 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2057 | goto error; | |
950131af DG |
2058 | } |
2059 | ||
950131af DG |
2060 | ret = LTTCOMM_OK; |
2061 | break; | |
2062 | } | |
0d0c377a | 2063 | case LTTNG_ENABLE_CHANNEL: |
d36b8583 | 2064 | { |
0d0c377a | 2065 | struct ltt_kernel_channel *kchan; |
d36b8583 DG |
2066 | |
2067 | /* Setup lttng message with no payload */ | |
2068 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2069 | if (ret < 0) { | |
2070 | goto setup_error; | |
2071 | } | |
2072 | ||
0d0c377a DG |
2073 | switch (cmd_ctx->lsm->domain.type) { |
2074 | case LTTNG_DOMAIN_KERNEL: | |
5eb91c98 DG |
2075 | kchan = trace_kernel_get_channel_by_name( |
2076 | cmd_ctx->lsm->u.enable.channel_name, | |
0d0c377a DG |
2077 | cmd_ctx->session->kernel_session); |
2078 | if (kchan == NULL) { | |
2079 | /* Channel not found, creating it */ | |
5eb91c98 DG |
2080 | DBG("Creating kernel channel %s", |
2081 | cmd_ctx->lsm->u.enable.channel_name); | |
7d29a247 | 2082 | |
0d0c377a | 2083 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
63053e7c DG |
2084 | &cmd_ctx->lsm->u.channel.chan, |
2085 | cmd_ctx->session->kernel_session->trace_path); | |
0d0c377a DG |
2086 | if (ret < 0) { |
2087 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2088 | goto error; | |
2089 | } | |
7d29a247 | 2090 | |
0d0c377a | 2091 | /* Notify kernel thread that there is a new channel */ |
5eb91c98 | 2092 | ret = notify_kernel_channels_update(); |
0d0c377a DG |
2093 | if (ret < 0) { |
2094 | ret = LTTCOMM_FATAL; | |
2095 | goto error; | |
2096 | } | |
2097 | } else if (kchan->enabled == 0) { | |
2098 | ret = kernel_enable_channel(kchan); | |
2099 | if (ret < 0) { | |
2100 | if (ret != EEXIST) { | |
2101 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
2102 | } | |
2103 | goto error; | |
d36b8583 | 2104 | } |
d36b8583 | 2105 | } |
0d0c377a DG |
2106 | |
2107 | kernel_wait_quiescent(kernel_tracer_fd); | |
2108 | break; | |
0177d773 | 2109 | case LTTNG_DOMAIN_UST_PID: |
0fdd1e2c | 2110 | |
0d0c377a DG |
2111 | break; |
2112 | default: | |
0d0c377a DG |
2113 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2114 | goto error; | |
d36b8583 DG |
2115 | } |
2116 | ||
d36b8583 DG |
2117 | ret = LTTCOMM_OK; |
2118 | break; | |
2119 | } | |
0d0c377a | 2120 | case LTTNG_ENABLE_EVENT: |
894be886 | 2121 | { |
7d29a247 DG |
2122 | char *channel_name; |
2123 | struct ltt_kernel_channel *kchan; | |
0d0c377a | 2124 | struct ltt_kernel_event *kevent; |
7d29a247 | 2125 | struct lttng_channel *chan; |
f3ed775e | 2126 | |
894be886 DG |
2127 | /* Setup lttng message with no payload */ |
2128 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2129 | if (ret < 0) { | |
2130 | goto setup_error; | |
2131 | } | |
2132 | ||
7d29a247 DG |
2133 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
2134 | ||
0d0c377a DG |
2135 | switch (cmd_ctx->lsm->domain.type) { |
2136 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 2137 | kchan = trace_kernel_get_channel_by_name(channel_name, |
b389abbe MD |
2138 | cmd_ctx->session->kernel_session); |
2139 | if (kchan == NULL) { | |
2140 | DBG("Channel not found. Creating channel %s", channel_name); | |
2141 | ||
2142 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); | |
2143 | if (chan == NULL) { | |
2144 | ret = LTTCOMM_FATAL; | |
2145 | goto error; | |
2146 | } | |
2147 | ||
2148 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
2149 | chan, cmd_ctx->session->kernel_session->trace_path); | |
2150 | if (ret < 0) { | |
2151 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2152 | goto error; | |
2153 | } | |
62499ad6 | 2154 | kchan = trace_kernel_get_channel_by_name(channel_name, |
0d0c377a DG |
2155 | cmd_ctx->session->kernel_session); |
2156 | if (kchan == NULL) { | |
b389abbe MD |
2157 | ERR("Channel %s not found after creation. Internal error, giving up.", |
2158 | channel_name); | |
2159 | ret = LTTCOMM_FATAL; | |
2160 | goto error; | |
7d29a247 | 2161 | } |
5eb91c98 DG |
2162 | |
2163 | ret = notify_kernel_channels_update(); | |
2164 | if (ret < 0) { | |
2165 | ret = LTTCOMM_FATAL; | |
2166 | goto error; | |
2167 | } | |
b389abbe | 2168 | } |
7d29a247 | 2169 | |
62499ad6 | 2170 | kevent = trace_kernel_get_event_by_name(cmd_ctx->lsm->u.enable.event.name, kchan); |
0d0c377a DG |
2171 | if (kevent == NULL) { |
2172 | DBG("Creating kernel event %s for channel %s.", | |
2173 | cmd_ctx->lsm->u.enable.event.name, channel_name); | |
2174 | ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, kchan); | |
2175 | } else { | |
2176 | DBG("Enabling kernel event %s for channel %s.", | |
2177 | kevent->event->name, channel_name); | |
2178 | ret = kernel_enable_event(kevent); | |
2179 | if (ret == -EEXIST) { | |
2180 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
7d29a247 DG |
2181 | goto error; |
2182 | } | |
2183 | } | |
f34daff7 | 2184 | |
0d0c377a DG |
2185 | if (ret < 0) { |
2186 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7d29a247 DG |
2187 | goto error; |
2188 | } | |
19e70852 | 2189 | |
0d0c377a DG |
2190 | kernel_wait_quiescent(kernel_tracer_fd); |
2191 | break; | |
2192 | default: | |
2193 | /* TODO: Userspace tracing */ | |
2194 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
19e70852 | 2195 | goto error; |
f3ed775e | 2196 | } |
19e70852 | 2197 | ret = LTTCOMM_OK; |
894be886 DG |
2198 | break; |
2199 | } | |
0d0c377a | 2200 | case LTTNG_ENABLE_ALL_EVENT: |
33a2b854 | 2201 | { |
9f19cc17 DG |
2202 | int size, i; |
2203 | char *channel_name; | |
7d29a247 | 2204 | struct ltt_kernel_channel *kchan; |
0d0c377a | 2205 | struct ltt_kernel_event *kevent; |
9f19cc17 | 2206 | struct lttng_event *event_list; |
7d29a247 | 2207 | struct lttng_channel *chan; |
33a2b854 DG |
2208 | |
2209 | /* Setup lttng message with no payload */ | |
2210 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2211 | if (ret < 0) { | |
2212 | goto setup_error; | |
2213 | } | |
2214 | ||
2215 | DBG("Enabling all kernel event"); | |
2216 | ||
7d29a247 DG |
2217 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
2218 | ||
0d0c377a DG |
2219 | switch (cmd_ctx->lsm->domain.type) { |
2220 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 2221 | kchan = trace_kernel_get_channel_by_name(channel_name, |
b389abbe MD |
2222 | cmd_ctx->session->kernel_session); |
2223 | if (kchan == NULL) { | |
2224 | DBG("Channel not found. Creating channel %s", channel_name); | |
2225 | ||
2226 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); | |
2227 | if (chan == NULL) { | |
2228 | ret = LTTCOMM_FATAL; | |
2229 | goto error; | |
2230 | } | |
2231 | ||
2232 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
2233 | chan, cmd_ctx->session->kernel_session->trace_path); | |
2234 | if (ret < 0) { | |
2235 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2236 | goto error; | |
2237 | } | |
62499ad6 | 2238 | kchan = trace_kernel_get_channel_by_name(channel_name, |
0d0c377a DG |
2239 | cmd_ctx->session->kernel_session); |
2240 | if (kchan == NULL) { | |
b389abbe MD |
2241 | ERR("Channel %s not found after creation. Internal error, giving up.", |
2242 | channel_name); | |
2243 | ret = LTTCOMM_FATAL; | |
2244 | goto error; | |
7d29a247 | 2245 | } |
5eb91c98 DG |
2246 | |
2247 | ret = notify_kernel_channels_update(); | |
2248 | if (ret < 0) { | |
2249 | ret = LTTCOMM_FATAL; | |
2250 | goto error; | |
2251 | } | |
b389abbe | 2252 | } |
7d29a247 | 2253 | |
0d0c377a DG |
2254 | /* For each event in the kernel session */ |
2255 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
2256 | DBG("Enabling kernel event %s for channel %s.", | |
2257 | kevent->event->name, channel_name); | |
2258 | ret = kernel_enable_event(kevent); | |
7d29a247 | 2259 | if (ret < 0) { |
0d0c377a | 2260 | continue; |
7d29a247 DG |
2261 | } |
2262 | } | |
33a2b854 | 2263 | |
0d0c377a DG |
2264 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
2265 | if (size < 0) { | |
2266 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2267 | goto error; | |
f3ed775e | 2268 | } |
f3ed775e | 2269 | |
0d0c377a | 2270 | for (i = 0; i < size; i++) { |
62499ad6 | 2271 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); |
0d0c377a DG |
2272 | if (kevent == NULL) { |
2273 | /* Default event type for enable all */ | |
2274 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
2275 | /* Enable each single tracepoint event */ | |
2276 | ret = kernel_create_event(&event_list[i], kchan); | |
2277 | if (ret < 0) { | |
2278 | /* Ignore error here and continue */ | |
2279 | } | |
950131af | 2280 | } |
33a2b854 | 2281 | } |
33a2b854 | 2282 | |
0d0c377a DG |
2283 | free(event_list); |
2284 | ||
2285 | /* Quiescent wait after event enable */ | |
2286 | kernel_wait_quiescent(kernel_tracer_fd); | |
2287 | break; | |
2288 | default: | |
2289 | /* TODO: Userspace tracing */ | |
2290 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2291 | goto error; | |
2292 | } | |
33a2b854 DG |
2293 | |
2294 | ret = LTTCOMM_OK; | |
2295 | break; | |
2296 | } | |
052da939 | 2297 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2298 | { |
9f19cc17 | 2299 | struct lttng_event *events; |
052da939 DG |
2300 | ssize_t nb_events = 0; |
2301 | ||
2302 | switch (cmd_ctx->lsm->domain.type) { | |
2303 | case LTTNG_DOMAIN_KERNEL: | |
2304 | DBG("Listing kernel events"); | |
2305 | nb_events = kernel_list_events(kernel_tracer_fd, &events); | |
2306 | if (nb_events < 0) { | |
2307 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2308 | goto error; | |
2309 | } | |
2310 | break; | |
2311 | default: | |
2312 | /* TODO: Userspace listing */ | |
2313 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2314 | break; | |
2ef84c95 DG |
2315 | } |
2316 | ||
2317 | /* | |
2318 | * Setup lttng message with payload size set to the event list size in | |
2319 | * bytes and then copy list into the llm payload. | |
2320 | */ | |
052da939 | 2321 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2322 | if (ret < 0) { |
052da939 | 2323 | free(events); |
2ef84c95 DG |
2324 | goto setup_error; |
2325 | } | |
2326 | ||
2327 | /* Copy event list into message payload */ | |
9f19cc17 | 2328 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2329 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2330 | |
9f19cc17 | 2331 | free(events); |
2ef84c95 DG |
2332 | |
2333 | ret = LTTCOMM_OK; | |
2334 | break; | |
2335 | } | |
f3ed775e | 2336 | case LTTNG_START_TRACE: |
8c0faa1d DG |
2337 | { |
2338 | struct ltt_kernel_channel *chan; | |
f3ed775e | 2339 | |
8c0faa1d DG |
2340 | /* Setup lttng message with no payload */ |
2341 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2342 | if (ret < 0) { | |
2343 | goto setup_error; | |
2344 | } | |
2345 | ||
f3ed775e DG |
2346 | /* Kernel tracing */ |
2347 | if (cmd_ctx->session->kernel_session != NULL) { | |
2348 | if (cmd_ctx->session->kernel_session->metadata == NULL) { | |
2349 | DBG("Open kernel metadata"); | |
58a97671 | 2350 | ret = kernel_open_metadata(cmd_ctx->session->kernel_session, |
63053e7c | 2351 | cmd_ctx->session->kernel_session->trace_path); |
f3ed775e DG |
2352 | if (ret < 0) { |
2353 | ret = LTTCOMM_KERN_META_FAIL; | |
2354 | goto error; | |
2355 | } | |
2356 | } | |
8c0faa1d | 2357 | |
f3ed775e DG |
2358 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { |
2359 | DBG("Opening kernel metadata stream"); | |
2360 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { | |
2361 | ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session); | |
2362 | if (ret < 0) { | |
2363 | ERR("Kernel create metadata stream failed"); | |
2364 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2365 | goto error; | |
2366 | } | |
2367 | } | |
2368 | } | |
8c0faa1d | 2369 | |
f3ed775e | 2370 | /* For each channel */ |
0d0c377a DG |
2371 | cds_list_for_each_entry(chan, |
2372 | &cmd_ctx->session->kernel_session->channel_list.head, list) { | |
f3ed775e DG |
2373 | if (chan->stream_count == 0) { |
2374 | ret = kernel_open_channel_stream(chan); | |
2375 | if (ret < 0) { | |
2376 | ERR("Kernel create channel stream failed"); | |
2377 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2378 | goto error; | |
2379 | } | |
2380 | /* Update the stream global counter */ | |
2381 | cmd_ctx->session->kernel_session->stream_count_global += ret; | |
2382 | } | |
2383 | } | |
2384 | ||
283046e0 | 2385 | ret = start_kernel_trace(cmd_ctx->session->kernel_session); |
8c0faa1d | 2386 | if (ret < 0) { |
f3ed775e | 2387 | ret = LTTCOMM_KERN_START_FAIL; |
8c0faa1d DG |
2388 | goto error; |
2389 | } | |
8c0faa1d | 2390 | |
283046e0 DG |
2391 | DBG("Start kernel tracing"); |
2392 | ret = kernel_start_session(cmd_ctx->session->kernel_session); | |
f3ed775e | 2393 | if (ret < 0) { |
283046e0 | 2394 | ERR("Kernel start session failed"); |
f3ed775e | 2395 | ret = LTTCOMM_KERN_START_FAIL; |
8c0faa1d DG |
2396 | goto error; |
2397 | } | |
8c0faa1d | 2398 | |
f3ed775e DG |
2399 | /* Quiescent wait after starting trace */ |
2400 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
2401 | } |
2402 | ||
f3ed775e | 2403 | /* TODO: Start all UST traces */ |
8c0faa1d DG |
2404 | |
2405 | ret = LTTCOMM_OK; | |
2406 | break; | |
2407 | } | |
f3ed775e | 2408 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2409 | { |
f3ed775e | 2410 | struct ltt_kernel_channel *chan; |
8c0faa1d DG |
2411 | /* Setup lttng message with no payload */ |
2412 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2413 | if (ret < 0) { | |
2414 | goto setup_error; | |
2415 | } | |
2416 | ||
f3ed775e DG |
2417 | /* Kernel tracer */ |
2418 | if (cmd_ctx->session->kernel_session != NULL) { | |
2419 | DBG("Stop kernel tracing"); | |
84291629 | 2420 | |
f3ed775e DG |
2421 | ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd); |
2422 | if (ret < 0) { | |
2423 | ERR("Kernel metadata flush failed"); | |
2424 | } | |
8c0faa1d | 2425 | |
f3ed775e DG |
2426 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { |
2427 | ret = kernel_flush_buffer(chan); | |
2428 | if (ret < 0) { | |
2429 | ERR("Kernel flush buffer error"); | |
2430 | } | |
2431 | } | |
2432 | ||
2433 | ret = kernel_stop_session(cmd_ctx->session->kernel_session); | |
2434 | if (ret < 0) { | |
2435 | ERR("Kernel stop session failed"); | |
2436 | ret = LTTCOMM_KERN_STOP_FAIL; | |
2437 | goto error; | |
2438 | } | |
2439 | ||
2440 | /* Quiescent wait after stopping trace */ | |
2441 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
2442 | } |
2443 | ||
f3ed775e | 2444 | /* TODO : User-space tracer */ |
8c0faa1d DG |
2445 | |
2446 | ret = LTTCOMM_OK; | |
2447 | break; | |
2448 | } | |
5e16da05 MD |
2449 | case LTTNG_CREATE_SESSION: |
2450 | { | |
5461b305 DG |
2451 | /* Setup lttng message with no payload */ |
2452 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2453 | if (ret < 0) { | |
2454 | goto setup_error; | |
2455 | } | |
2456 | ||
3c6bae61 | 2457 | tracepoint(create_session_start); |
42abccdb | 2458 | ret = create_session(cmd_ctx->lsm->session.name, cmd_ctx->lsm->session.path); |
3c6bae61 | 2459 | tracepoint(create_session_end); |
5e16da05 | 2460 | if (ret < 0) { |
f3ed775e | 2461 | if (ret == -EEXIST) { |
5e16da05 MD |
2462 | ret = LTTCOMM_EXIST_SESS; |
2463 | } else { | |
aaf97519 | 2464 | ret = LTTCOMM_FATAL; |
aaf97519 | 2465 | } |
5461b305 | 2466 | goto error; |
8028d920 | 2467 | } |
1657e9bb | 2468 | |
5461b305 | 2469 | ret = LTTCOMM_OK; |
5e16da05 MD |
2470 | break; |
2471 | } | |
2472 | case LTTNG_DESTROY_SESSION: | |
2473 | { | |
5461b305 DG |
2474 | /* Setup lttng message with no payload */ |
2475 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2476 | if (ret < 0) { | |
2477 | goto setup_error; | |
2478 | } | |
2479 | ||
f3ed775e DG |
2480 | /* Clean kernel session teardown */ |
2481 | teardown_kernel_session(cmd_ctx->session); | |
2482 | ||
3c6bae61 | 2483 | tracepoint(destroy_session_start); |
42abccdb | 2484 | ret = destroy_session(cmd_ctx->lsm->session.name); |
3c6bae61 | 2485 | tracepoint(destroy_session_end); |
5e16da05 | 2486 | if (ret < 0) { |
f3ed775e | 2487 | ret = LTTCOMM_FATAL; |
5461b305 | 2488 | goto error; |
5e16da05 | 2489 | } |
1657e9bb | 2490 | |
7a485870 | 2491 | /* |
5eb91c98 DG |
2492 | * Must notify the kernel thread here to update it's poll setin order |
2493 | * to remove the channel(s)' fd just destroyed. | |
7a485870 | 2494 | */ |
5eb91c98 | 2495 | ret = notify_kernel_channels_update(); |
7a485870 DG |
2496 | if (ret < 0) { |
2497 | ret = LTTCOMM_FATAL; | |
2498 | goto error; | |
2499 | } | |
2500 | ||
5461b305 DG |
2501 | ret = LTTCOMM_OK; |
2502 | break; | |
5e16da05 | 2503 | } |
9f19cc17 | 2504 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2505 | { |
4b222185 | 2506 | size_t nb_dom = 0; |
5461b305 | 2507 | |
9f19cc17 DG |
2508 | if (cmd_ctx->session->kernel_session != NULL) { |
2509 | nb_dom++; | |
ce3d728c | 2510 | } |
520ff687 | 2511 | |
0177d773 | 2512 | nb_dom += cmd_ctx->session->ust_session_list.count; |
9f19cc17 DG |
2513 | |
2514 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_domain) * nb_dom); | |
5461b305 DG |
2515 | if (ret < 0) { |
2516 | goto setup_error; | |
520ff687 | 2517 | } |
57167058 | 2518 | |
9f19cc17 DG |
2519 | ((struct lttng_domain *)(cmd_ctx->llm->payload))[0].type = |
2520 | LTTNG_DOMAIN_KERNEL; | |
5e16da05 | 2521 | |
9f19cc17 | 2522 | /* TODO: User-space tracer domain support */ |
5461b305 | 2523 | ret = LTTCOMM_OK; |
5e16da05 MD |
2524 | break; |
2525 | } | |
9f19cc17 | 2526 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2527 | { |
9f19cc17 DG |
2528 | /* |
2529 | * TODO: Only kernel channels are listed here. UST listing | |
2530 | * is needed on lttng-ust 2.0 release. | |
2531 | */ | |
2532 | size_t nb_chan = 0; | |
2533 | if (cmd_ctx->session->kernel_session != NULL) { | |
2534 | nb_chan += cmd_ctx->session->kernel_session->channel_count; | |
5461b305 | 2535 | } |
ca95a216 | 2536 | |
9f19cc17 DG |
2537 | ret = setup_lttng_msg(cmd_ctx, |
2538 | sizeof(struct lttng_channel) * nb_chan); | |
5461b305 DG |
2539 | if (ret < 0) { |
2540 | goto setup_error; | |
2541 | } | |
9f19cc17 DG |
2542 | |
2543 | list_lttng_channels(cmd_ctx->session, | |
2544 | (struct lttng_channel *)(cmd_ctx->llm->payload)); | |
2545 | ||
2546 | ret = LTTCOMM_OK; | |
5461b305 | 2547 | break; |
5e16da05 | 2548 | } |
9f19cc17 | 2549 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2550 | { |
9f19cc17 DG |
2551 | /* |
2552 | * TODO: Only kernel events are listed here. UST listing | |
2553 | * is needed on lttng-ust 2.0 release. | |
2554 | */ | |
2555 | size_t nb_event = 0; | |
2556 | struct ltt_kernel_channel *kchan = NULL; | |
2557 | ||
2558 | if (cmd_ctx->session->kernel_session != NULL) { | |
62499ad6 | 2559 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.list.channel_name, |
9f19cc17 DG |
2560 | cmd_ctx->session->kernel_session); |
2561 | if (kchan == NULL) { | |
2562 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2563 | goto error; | |
2564 | } | |
2565 | nb_event += kchan->event_count; | |
5461b305 | 2566 | } |
ca95a216 | 2567 | |
9f19cc17 DG |
2568 | ret = setup_lttng_msg(cmd_ctx, |
2569 | sizeof(struct lttng_event) * nb_event); | |
5461b305 DG |
2570 | if (ret < 0) { |
2571 | goto setup_error; | |
2572 | } | |
9f19cc17 | 2573 | |
ced2f820 | 2574 | DBG("Listing events (%zu events)", nb_event); |
9f19cc17 DG |
2575 | |
2576 | list_lttng_events(kchan, | |
2577 | (struct lttng_event *)(cmd_ctx->llm->payload)); | |
2578 | ||
2579 | ret = LTTCOMM_OK; | |
5461b305 | 2580 | break; |
5e16da05 MD |
2581 | } |
2582 | case LTTNG_LIST_SESSIONS: | |
2583 | { | |
6c9cc2ab | 2584 | lock_session_list(); |
5461b305 | 2585 | |
6c9cc2ab | 2586 | if (session_list_ptr->count == 0) { |
f3ed775e | 2587 | ret = LTTCOMM_NO_SESSION; |
36a83748 | 2588 | unlock_session_list(); |
5461b305 | 2589 | goto error; |
57167058 | 2590 | } |
5e16da05 | 2591 | |
6c9cc2ab DG |
2592 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
2593 | session_list_ptr->count); | |
5461b305 | 2594 | if (ret < 0) { |
36a83748 | 2595 | unlock_session_list(); |
5461b305 | 2596 | goto setup_error; |
e065084a | 2597 | } |
5e16da05 | 2598 | |
6c9cc2ab DG |
2599 | /* Filled the session array */ |
2600 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
2601 | ||
2602 | unlock_session_list(); | |
5e16da05 | 2603 | |
5461b305 | 2604 | ret = LTTCOMM_OK; |
5e16da05 MD |
2605 | break; |
2606 | } | |
d0254c7c MD |
2607 | case LTTNG_CALIBRATE: |
2608 | { | |
2609 | /* Setup lttng message with no payload */ | |
2610 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2611 | if (ret < 0) { | |
2612 | goto setup_error; | |
2613 | } | |
2614 | ||
2615 | switch (cmd_ctx->lsm->domain.type) { | |
2616 | case LTTNG_DOMAIN_KERNEL: | |
2617 | { | |
2618 | struct lttng_kernel_calibrate kcalibrate; | |
2619 | ||
2620 | kcalibrate.type = cmd_ctx->lsm->u.calibrate.type; | |
2621 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
2622 | if (ret < 0) { | |
2623 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2624 | goto error; | |
2625 | } | |
2626 | break; | |
2627 | } | |
2628 | default: | |
2629 | /* TODO: Userspace tracing */ | |
2630 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2631 | goto error; | |
2632 | } | |
2633 | ret = LTTCOMM_OK; | |
2634 | break; | |
2635 | } | |
d9800920 DG |
2636 | case LTTNG_REGISTER_CONSUMER: |
2637 | { | |
2638 | int sock; | |
2639 | ||
2640 | /* Setup lttng message with no payload */ | |
2641 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2642 | if (ret < 0) { | |
2643 | goto setup_error; | |
2644 | } | |
2645 | ||
2646 | switch (cmd_ctx->lsm->domain.type) { | |
2647 | case LTTNG_DOMAIN_KERNEL: | |
2648 | { | |
2649 | /* Can't register a consumer if there is already one */ | |
2650 | if (cmd_ctx->session->kernel_session->consumer_fd != 0) { | |
2651 | ret = LTTCOMM_CONNECT_FAIL; | |
2652 | goto error; | |
2653 | } | |
2654 | ||
2655 | sock = lttcomm_connect_unix_sock(cmd_ctx->lsm->u.reg.path); | |
2656 | if (sock < 0) { | |
2657 | ret = LTTCOMM_CONNECT_FAIL; | |
2658 | goto error; | |
2659 | } | |
2660 | ||
2661 | cmd_ctx->session->kernel_session->consumer_fd = sock; | |
2662 | break; | |
2663 | } | |
2664 | default: | |
2665 | /* TODO: Userspace tracing */ | |
2666 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2667 | goto error; | |
2668 | } | |
2669 | ||
2670 | ret = LTTCOMM_OK; | |
2671 | break; | |
2672 | } | |
d0254c7c | 2673 | |
5e16da05 MD |
2674 | default: |
2675 | /* Undefined command */ | |
5461b305 DG |
2676 | ret = setup_lttng_msg(cmd_ctx, 0); |
2677 | if (ret < 0) { | |
2678 | goto setup_error; | |
2679 | } | |
2680 | ||
5e16da05 | 2681 | ret = LTTCOMM_UND; |
5461b305 | 2682 | break; |
fac6795d DG |
2683 | } |
2684 | ||
5461b305 DG |
2685 | /* Set return code */ |
2686 | cmd_ctx->llm->ret_code = ret; | |
ca95a216 | 2687 | |
b5541356 DG |
2688 | if (cmd_ctx->session) { |
2689 | unlock_session(cmd_ctx->session); | |
2690 | } | |
2691 | ||
e065084a DG |
2692 | return ret; |
2693 | ||
5461b305 | 2694 | error: |
5461b305 DG |
2695 | if (cmd_ctx->llm == NULL) { |
2696 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2697 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2698 | goto setup_error; |
2699 | } | |
2700 | } | |
e065084a | 2701 | /* Notify client of error */ |
5461b305 | 2702 | cmd_ctx->llm->ret_code = ret; |
e065084a | 2703 | |
5461b305 | 2704 | setup_error: |
b5541356 DG |
2705 | if (cmd_ctx->session) { |
2706 | unlock_session(cmd_ctx->session); | |
2707 | } | |
8028d920 | 2708 | return ret; |
fac6795d DG |
2709 | } |
2710 | ||
1d4b027a | 2711 | /* |
d063d709 DG |
2712 | * This thread manage all clients request using the unix client socket for |
2713 | * communication. | |
1d4b027a DG |
2714 | */ |
2715 | static void *thread_manage_clients(void *data) | |
2716 | { | |
5eb91c98 DG |
2717 | int sock = 0, ret, i, pollfd; |
2718 | uint32_t revents, nb_fd; | |
273ea72c | 2719 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 2720 | struct lttng_poll_event events; |
1d4b027a | 2721 | |
b25a8868 DG |
2722 | tracepoint(sessiond_th_cli_start); |
2723 | ||
1d4b027a DG |
2724 | DBG("[thread] Manage client started"); |
2725 | ||
2726 | ret = lttcomm_listen_unix_sock(client_sock); | |
2727 | if (ret < 0) { | |
2728 | goto error; | |
2729 | } | |
2730 | ||
5eb91c98 DG |
2731 | /* |
2732 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2733 | * more will be added to this poll set. | |
2734 | */ | |
2735 | ret = create_thread_poll_set(&events, 2); | |
2736 | if (ret < 0) { | |
2737 | goto error; | |
2738 | } | |
273ea72c | 2739 | |
5eb91c98 DG |
2740 | /* Add the application registration socket */ |
2741 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
2742 | if (ret < 0) { | |
2743 | goto error; | |
2744 | } | |
273ea72c | 2745 | |
bbd973c2 DG |
2746 | /* |
2747 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
2748 | */ |
2749 | if (opt_sig_parent) { | |
2750 | kill(ppid, SIGCHLD); | |
2751 | } | |
2752 | ||
2753 | while (1) { | |
1d4b027a | 2754 | DBG("Accepting client command ..."); |
273ea72c | 2755 | |
b25a8868 DG |
2756 | tracepoint(sessiond_th_cli_poll); |
2757 | ||
5eb91c98 DG |
2758 | nb_fd = LTTNG_POLL_GETNB(&events); |
2759 | ||
273ea72c | 2760 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 2761 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 2762 | if (ret < 0) { |
273ea72c DG |
2763 | goto error; |
2764 | } | |
2765 | ||
5eb91c98 DG |
2766 | for (i = 0; i < nb_fd; i++) { |
2767 | /* Fetch once the poll data */ | |
2768 | revents = LTTNG_POLL_GETEV(&events, i); | |
2769 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2770 | ||
2771 | /* Thread quit pipe has been closed. Killing thread. */ | |
2772 | ret = check_thread_quit_pipe(pollfd, revents); | |
2773 | if (ret) { | |
2774 | goto error; | |
2775 | } | |
2776 | ||
2777 | /* Event on the registration socket */ | |
2778 | if (pollfd == client_sock) { | |
2779 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2780 | ERR("Client socket poll error"); | |
2781 | goto error; | |
2782 | } | |
2783 | } | |
273ea72c DG |
2784 | } |
2785 | ||
5eb91c98 DG |
2786 | DBG("Wait for client response"); |
2787 | ||
1d4b027a DG |
2788 | sock = lttcomm_accept_unix_sock(client_sock); |
2789 | if (sock < 0) { | |
2790 | goto error; | |
2791 | } | |
2792 | ||
2793 | /* Allocate context command to process the client request */ | |
2794 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
5eb91c98 DG |
2795 | if (cmd_ctx == NULL) { |
2796 | perror("malloc cmd_ctx"); | |
1d4b027a | 2797 | goto error; |
5eb91c98 | 2798 | } |
1d4b027a DG |
2799 | |
2800 | /* Allocate data buffer for reception */ | |
2801 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
5eb91c98 DG |
2802 | if (cmd_ctx->lsm == NULL) { |
2803 | perror("malloc cmd_ctx->lsm"); | |
2804 | goto error; | |
2805 | } | |
1d4b027a | 2806 | |
1d4b027a DG |
2807 | cmd_ctx->llm = NULL; |
2808 | cmd_ctx->session = NULL; | |
2809 | ||
2810 | /* | |
2811 | * Data is received from the lttng client. The struct | |
2812 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2813 | * the client. | |
2814 | */ | |
2815 | DBG("Receiving data from client ..."); | |
5eb91c98 DG |
2816 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, |
2817 | sizeof(struct lttcomm_session_msg)); | |
1d4b027a | 2818 | if (ret <= 0) { |
5eb91c98 DG |
2819 | DBG("Nothing recv() from client... continuing"); |
2820 | close(sock); | |
2821 | free(cmd_ctx); | |
1d4b027a DG |
2822 | continue; |
2823 | } | |
2824 | ||
5eb91c98 DG |
2825 | // TODO: Validate cmd_ctx including sanity check for |
2826 | // security purpose. | |
f7776ea7 | 2827 | |
1d4b027a DG |
2828 | /* |
2829 | * This function dispatch the work to the kernel or userspace tracer | |
2830 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2831 | * informations for the client. The command context struct contains | |
2832 | * everything this function may needs. | |
2833 | */ | |
2834 | ret = process_client_msg(cmd_ctx); | |
2835 | if (ret < 0) { | |
bbd973c2 | 2836 | /* |
5eb91c98 DG |
2837 | * TODO: Inform client somehow of the fatal error. At |
2838 | * this point, ret < 0 means that a malloc failed | |
2839 | * (ENOMEM). Error detected but still accept command. | |
bbd973c2 | 2840 | */ |
a2fb29a5 | 2841 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2842 | continue; |
2843 | } | |
2844 | ||
2845 | DBG("Sending response (size: %d, retcode: %d)", | |
2846 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); | |
5eb91c98 DG |
2847 | ret = send_unix_sock(sock, cmd_ctx->llm, |
2848 | cmd_ctx->lttng_msg_size); | |
1d4b027a DG |
2849 | if (ret < 0) { |
2850 | ERR("Failed to send data back to client"); | |
2851 | } | |
2852 | ||
a2fb29a5 | 2853 | clean_command_ctx(&cmd_ctx); |
d6e4fca4 DG |
2854 | |
2855 | /* End of transmission */ | |
2856 | close(sock); | |
1d4b027a DG |
2857 | } |
2858 | ||
2859 | error: | |
273ea72c | 2860 | DBG("Client thread dying"); |
273ea72c | 2861 | unlink(client_unix_sock_path); |
5eb91c98 DG |
2862 | close(client_sock); |
2863 | close(sock); | |
273ea72c | 2864 | |
5eb91c98 | 2865 | lttng_poll_clean(&events); |
a2fb29a5 | 2866 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2867 | return NULL; |
2868 | } | |
2869 | ||
2870 | ||
fac6795d DG |
2871 | /* |
2872 | * usage function on stderr | |
2873 | */ | |
2874 | static void usage(void) | |
2875 | { | |
b716ce68 | 2876 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
2877 | fprintf(stderr, " -h, --help Display this usage.\n"); |
2878 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
2879 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
2880 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
2881 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
2882 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
2883 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
2884 | fprintf(stderr, " -V, --version Show version number.\n"); | |
2885 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
2886 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
2887 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
31f73cc9 | 2888 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
fac6795d DG |
2889 | } |
2890 | ||
2891 | /* | |
2892 | * daemon argument parsing | |
2893 | */ | |
2894 | static int parse_args(int argc, char **argv) | |
2895 | { | |
2896 | int c; | |
2897 | ||
2898 | static struct option long_options[] = { | |
2899 | { "client-sock", 1, 0, 'c' }, | |
2900 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
2901 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
2902 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 2903 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 2904 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
2905 | { "help", 0, 0, 'h' }, |
2906 | { "group", 1, 0, 'g' }, | |
2907 | { "version", 0, 0, 'V' }, | |
75462a81 | 2908 | { "quiet", 0, 0, 'q' }, |
3f9947db | 2909 | { "verbose", 0, 0, 'v' }, |
31f73cc9 | 2910 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
fac6795d DG |
2911 | { NULL, 0, 0, 0 } |
2912 | }; | |
2913 | ||
2914 | while (1) { | |
2915 | int option_index = 0; | |
31f73cc9 | 2916 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", long_options, &option_index); |
fac6795d DG |
2917 | if (c == -1) { |
2918 | break; | |
2919 | } | |
2920 | ||
2921 | switch (c) { | |
2922 | case 0: | |
2923 | fprintf(stderr, "option %s", long_options[option_index].name); | |
2924 | if (optarg) { | |
2925 | fprintf(stderr, " with arg %s\n", optarg); | |
2926 | } | |
2927 | break; | |
b716ce68 | 2928 | case 'c': |
fac6795d DG |
2929 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
2930 | break; | |
2931 | case 'a': | |
2932 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
2933 | break; | |
2934 | case 'd': | |
2935 | opt_daemon = 1; | |
2936 | break; | |
2937 | case 'g': | |
2938 | opt_tracing_group = strdup(optarg); | |
2939 | break; | |
2940 | case 'h': | |
2941 | usage(); | |
2942 | exit(EXIT_FAILURE); | |
2943 | case 'V': | |
2944 | fprintf(stdout, "%s\n", VERSION); | |
2945 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
2946 | case 'S': |
2947 | opt_sig_parent = 1; | |
2948 | break; | |
d6f42150 DG |
2949 | case 'E': |
2950 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
2951 | break; | |
2952 | case 'C': | |
2953 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
2954 | break; | |
75462a81 DG |
2955 | case 'q': |
2956 | opt_quiet = 1; | |
2957 | break; | |
3f9947db | 2958 | case 'v': |
53086306 DG |
2959 | /* Verbose level can increase using multiple -v */ |
2960 | opt_verbose += 1; | |
3f9947db | 2961 | break; |
31f73cc9 MD |
2962 | case 'Z': |
2963 | opt_verbose_kconsumerd += 1; | |
2964 | break; | |
fac6795d DG |
2965 | default: |
2966 | /* Unknown option or other error. | |
2967 | * Error is printed by getopt, just return */ | |
2968 | return -1; | |
2969 | } | |
2970 | } | |
2971 | ||
2972 | return 0; | |
2973 | } | |
2974 | ||
2975 | /* | |
d063d709 | 2976 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
2977 | * apps_sock - The communication socket for all UST apps. |
2978 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 2979 | */ |
cf3af59e | 2980 | static int init_daemon_socket(void) |
fac6795d DG |
2981 | { |
2982 | int ret = 0; | |
2983 | mode_t old_umask; | |
2984 | ||
2985 | old_umask = umask(0); | |
2986 | ||
2987 | /* Create client tool unix socket */ | |
d6f42150 DG |
2988 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
2989 | if (client_sock < 0) { | |
2990 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
2991 | ret = -1; |
2992 | goto end; | |
2993 | } | |
2994 | ||
2995 | /* File permission MUST be 660 */ | |
2996 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2997 | if (ret < 0) { | |
d6f42150 | 2998 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
2999 | perror("chmod"); |
3000 | goto end; | |
3001 | } | |
3002 | ||
3003 | /* Create the application unix socket */ | |
d6f42150 DG |
3004 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3005 | if (apps_sock < 0) { | |
3006 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3007 | ret = -1; |
3008 | goto end; | |
3009 | } | |
3010 | ||
d6f42150 | 3011 | /* File permission MUST be 666 */ |
fac6795d DG |
3012 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
3013 | if (ret < 0) { | |
d6f42150 | 3014 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3015 | perror("chmod"); |
3016 | goto end; | |
3017 | } | |
3018 | ||
3019 | end: | |
3020 | umask(old_umask); | |
3021 | return ret; | |
3022 | } | |
3023 | ||
3024 | /* | |
7d8234d9 MD |
3025 | * Check if the global socket is available, and if a daemon is answering |
3026 | * at the other side. If yes, error is returned. | |
fac6795d | 3027 | */ |
cf3af59e | 3028 | static int check_existing_daemon(void) |
fac6795d | 3029 | { |
7d8234d9 | 3030 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3031 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3032 | return 0; |
099e26bd | 3033 | } |
7d8234d9 | 3034 | /* Is there anybody out there ? */ |
099e26bd | 3035 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3036 | return -EEXIST; |
099e26bd | 3037 | } else { |
7d8234d9 | 3038 | return 0; |
099e26bd | 3039 | } |
fac6795d DG |
3040 | } |
3041 | ||
fac6795d | 3042 | /* |
d063d709 | 3043 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3044 | * |
d063d709 DG |
3045 | * Race window between mkdir and chown is OK because we are going from more |
3046 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 3047 | */ |
d6f42150 | 3048 | static int set_permissions(void) |
fac6795d DG |
3049 | { |
3050 | int ret; | |
996b65c8 | 3051 | gid_t gid; |
fac6795d | 3052 | |
996b65c8 MD |
3053 | gid = allowed_group(); |
3054 | if (gid < 0) { | |
a463f419 DG |
3055 | if (is_root) { |
3056 | WARN("No tracing group detected"); | |
3057 | ret = 0; | |
3058 | } else { | |
3059 | ERR("Missing tracing group. Aborting execution."); | |
3060 | ret = -1; | |
3061 | } | |
fac6795d DG |
3062 | goto end; |
3063 | } | |
3064 | ||
d6f42150 | 3065 | /* Set lttng run dir */ |
996b65c8 | 3066 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
3067 | if (ret < 0) { |
3068 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
3069 | perror("chown"); | |
3070 | } | |
3071 | ||
3072 | /* lttng client socket path */ | |
996b65c8 | 3073 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3074 | if (ret < 0) { |
d6f42150 DG |
3075 | ERR("Unable to set group on %s", client_unix_sock_path); |
3076 | perror("chown"); | |
3077 | } | |
3078 | ||
3079 | /* kconsumerd error socket path */ | |
996b65c8 | 3080 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
d6f42150 DG |
3081 | if (ret < 0) { |
3082 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
3083 | perror("chown"); |
3084 | } | |
3085 | ||
d6f42150 | 3086 | DBG("All permissions are set"); |
e07ae692 | 3087 | |
fac6795d DG |
3088 | end: |
3089 | return ret; | |
3090 | } | |
3091 | ||
7a485870 | 3092 | /* |
d063d709 | 3093 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
3094 | */ |
3095 | static int create_kernel_poll_pipe(void) | |
3096 | { | |
3097 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
3098 | } | |
3099 | ||
099e26bd DG |
3100 | /* |
3101 | * Create the application command pipe to wake thread_manage_apps. | |
3102 | */ | |
3103 | static int create_apps_cmd_pipe(void) | |
3104 | { | |
3105 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
3106 | } | |
3107 | ||
d6f42150 | 3108 | /* |
d063d709 | 3109 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
3110 | */ |
3111 | static int create_lttng_rundir(void) | |
3112 | { | |
3113 | int ret; | |
3114 | ||
3115 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
3116 | if (ret < 0) { | |
b1f11e69 DG |
3117 | if (errno != EEXIST) { |
3118 | ERR("Unable to create " LTTNG_RUNDIR); | |
3119 | goto error; | |
3120 | } else { | |
3121 | ret = 0; | |
3122 | } | |
d6f42150 DG |
3123 | } |
3124 | ||
3125 | error: | |
3126 | return ret; | |
3127 | } | |
3128 | ||
3129 | /* | |
d063d709 DG |
3130 | * Setup sockets and directory needed by the kconsumerd communication with the |
3131 | * session daemon. | |
d6f42150 DG |
3132 | */ |
3133 | static int set_kconsumerd_sockets(void) | |
3134 | { | |
3135 | int ret; | |
3136 | ||
3137 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
3138 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); | |
3139 | } | |
3140 | ||
3141 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
3142 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); | |
3143 | } | |
3144 | ||
3145 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
3146 | if (ret < 0) { | |
6beb2242 DG |
3147 | if (errno != EEXIST) { |
3148 | ERR("Failed to create " KCONSUMERD_PATH); | |
3149 | goto error; | |
3150 | } | |
3151 | ret = 0; | |
d6f42150 DG |
3152 | } |
3153 | ||
3154 | /* Create the kconsumerd error unix socket */ | |
3155 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
3156 | if (kconsumerd_err_sock < 0) { | |
3157 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
3158 | ret = -1; | |
3159 | goto error; | |
3160 | } | |
3161 | ||
3162 | /* File permission MUST be 660 */ | |
3163 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3164 | if (ret < 0) { | |
3165 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
3166 | perror("chmod"); | |
3167 | goto error; | |
3168 | } | |
3169 | ||
3170 | error: | |
3171 | return ret; | |
3172 | } | |
3173 | ||
fac6795d | 3174 | /* |
d063d709 | 3175 | * Signal handler for the daemon |
cf3af59e MD |
3176 | * |
3177 | * Simply stop all worker threads, leaving main() return gracefully | |
3178 | * after joining all threads and calling cleanup(). | |
fac6795d DG |
3179 | */ |
3180 | static void sighandler(int sig) | |
3181 | { | |
3182 | switch (sig) { | |
cf3af59e MD |
3183 | case SIGPIPE: |
3184 | DBG("SIGPIPE catched"); | |
3185 | return; | |
3186 | case SIGINT: | |
3187 | DBG("SIGINT catched"); | |
3188 | stop_threads(); | |
3189 | break; | |
3190 | case SIGTERM: | |
3191 | DBG("SIGTERM catched"); | |
3192 | stop_threads(); | |
3193 | break; | |
3194 | default: | |
3195 | break; | |
fac6795d | 3196 | } |
fac6795d DG |
3197 | } |
3198 | ||
3199 | /* | |
d063d709 | 3200 | * Setup signal handler for : |
1d4b027a | 3201 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3202 | */ |
1d4b027a | 3203 | static int set_signal_handler(void) |
fac6795d | 3204 | { |
1d4b027a DG |
3205 | int ret = 0; |
3206 | struct sigaction sa; | |
3207 | sigset_t sigset; | |
fac6795d | 3208 | |
1d4b027a DG |
3209 | if ((ret = sigemptyset(&sigset)) < 0) { |
3210 | perror("sigemptyset"); | |
3211 | return ret; | |
3212 | } | |
d6f42150 | 3213 | |
1d4b027a DG |
3214 | sa.sa_handler = sighandler; |
3215 | sa.sa_mask = sigset; | |
3216 | sa.sa_flags = 0; | |
3217 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3218 | perror("sigaction"); | |
3219 | return ret; | |
d6f42150 DG |
3220 | } |
3221 | ||
1d4b027a DG |
3222 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3223 | perror("sigaction"); | |
3224 | return ret; | |
d6f42150 | 3225 | } |
aaf26714 | 3226 | |
1d4b027a DG |
3227 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3228 | perror("sigaction"); | |
3229 | return ret; | |
8c0faa1d DG |
3230 | } |
3231 | ||
1d4b027a DG |
3232 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3233 | ||
3234 | return ret; | |
fac6795d DG |
3235 | } |
3236 | ||
f3ed775e | 3237 | /* |
d063d709 DG |
3238 | * Set open files limit to unlimited. This daemon can open a large number of |
3239 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3240 | */ |
3241 | static void set_ulimit(void) | |
3242 | { | |
3243 | int ret; | |
3244 | struct rlimit lim; | |
3245 | ||
a88df331 | 3246 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3247 | lim.rlim_cur = 65535; |
3248 | lim.rlim_max = 65535; | |
3249 | ||
3250 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3251 | if (ret < 0) { | |
3252 | perror("failed to set open files limit"); | |
3253 | } | |
3254 | } | |
3255 | ||
fac6795d DG |
3256 | /* |
3257 | * main | |
3258 | */ | |
3259 | int main(int argc, char **argv) | |
3260 | { | |
fac6795d DG |
3261 | int ret = 0; |
3262 | void *status; | |
b082db07 | 3263 | const char *home_path; |
fac6795d | 3264 | |
b25a8868 DG |
3265 | tracepoint(sessiond_boot_start); |
3266 | ||
273ea72c | 3267 | /* Create thread quit pipe */ |
cf3af59e MD |
3268 | if ((ret = init_thread_quit_pipe()) < 0) { |
3269 | goto error; | |
273ea72c DG |
3270 | } |
3271 | ||
fac6795d DG |
3272 | /* Parse arguments */ |
3273 | progname = argv[0]; | |
3274 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3275 | goto error; |
fac6795d DG |
3276 | } |
3277 | ||
3278 | /* Daemonize */ | |
3279 | if (opt_daemon) { | |
53094c05 DG |
3280 | ret = daemon(0, 0); |
3281 | if (ret < 0) { | |
3282 | perror("daemon"); | |
cf3af59e | 3283 | goto error; |
53094c05 | 3284 | } |
fac6795d DG |
3285 | } |
3286 | ||
3287 | /* Check if daemon is UID = 0 */ | |
3288 | is_root = !getuid(); | |
3289 | ||
fac6795d | 3290 | if (is_root) { |
d6f42150 DG |
3291 | ret = create_lttng_rundir(); |
3292 | if (ret < 0) { | |
cf3af59e | 3293 | goto error; |
d6f42150 DG |
3294 | } |
3295 | ||
fac6795d | 3296 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3297 | snprintf(apps_unix_sock_path, PATH_MAX, |
3298 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3299 | } |
3300 | ||
3301 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3302 | snprintf(client_unix_sock_path, PATH_MAX, |
3303 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3304 | } | |
0fdd1e2c DG |
3305 | |
3306 | /* Set global SHM for ust */ | |
3307 | if (strlen(wait_shm_path) == 0) { | |
3308 | snprintf(wait_shm_path, PATH_MAX, | |
3309 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3310 | } | |
fac6795d | 3311 | } else { |
b082db07 DG |
3312 | home_path = get_home_dir(); |
3313 | if (home_path == NULL) { | |
273ea72c DG |
3314 | /* TODO: Add --socket PATH option */ |
3315 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3316 | ret = -EPERM; |
3317 | goto error; | |
b082db07 DG |
3318 | } |
3319 | ||
fac6795d | 3320 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3321 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3322 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3323 | } |
3324 | ||
3325 | /* Set the cli tool unix socket path */ | |
3326 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3327 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3328 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 3329 | } |
0fdd1e2c DG |
3330 | |
3331 | /* Set global SHM for ust */ | |
3332 | if (strlen(wait_shm_path) == 0) { | |
3333 | snprintf(wait_shm_path, PATH_MAX, | |
3334 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
3335 | } | |
fac6795d DG |
3336 | } |
3337 | ||
847177cd DG |
3338 | DBG("Client socket path %s", client_unix_sock_path); |
3339 | DBG("Application socket path %s", apps_unix_sock_path); | |
3340 | ||
273ea72c | 3341 | /* |
7d8234d9 | 3342 | * See if daemon already exist. |
fac6795d | 3343 | */ |
7d8234d9 | 3344 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 3345 | ERR("Already running daemon.\n"); |
273ea72c | 3346 | /* |
cf3af59e MD |
3347 | * We do not goto exit because we must not cleanup() |
3348 | * because a daemon is already running. | |
ab118b20 | 3349 | */ |
cf3af59e | 3350 | goto error; |
a88df331 DG |
3351 | } |
3352 | ||
3353 | /* After this point, we can safely call cleanup() so goto error is used */ | |
3354 | ||
3355 | /* | |
3356 | * These actions must be executed as root. We do that *after* setting up | |
3357 | * the sockets path because we MUST make the check for another daemon using | |
3358 | * those paths *before* trying to set the kernel consumer sockets and init | |
3359 | * kernel tracer. | |
3360 | */ | |
3361 | if (is_root) { | |
3362 | ret = set_kconsumerd_sockets(); | |
3363 | if (ret < 0) { | |
cf3af59e | 3364 | goto exit; |
a88df331 DG |
3365 | } |
3366 | ||
3367 | /* Setup kernel tracer */ | |
3368 | init_kernel_tracer(); | |
3369 | ||
3370 | /* Set ulimit for open files */ | |
3371 | set_ulimit(); | |
fac6795d DG |
3372 | } |
3373 | ||
cf3af59e MD |
3374 | if ((ret = set_signal_handler()) < 0) { |
3375 | goto exit; | |
fac6795d DG |
3376 | } |
3377 | ||
d6f42150 | 3378 | /* Setup the needed unix socket */ |
cf3af59e MD |
3379 | if ((ret = init_daemon_socket()) < 0) { |
3380 | goto exit; | |
fac6795d DG |
3381 | } |
3382 | ||
3383 | /* Set credentials to socket */ | |
cf3af59e MD |
3384 | if (is_root && ((ret = set_permissions()) < 0)) { |
3385 | goto exit; | |
fac6795d DG |
3386 | } |
3387 | ||
5b8719f5 DG |
3388 | /* Get parent pid if -S, --sig-parent is specified. */ |
3389 | if (opt_sig_parent) { | |
3390 | ppid = getppid(); | |
3391 | } | |
3392 | ||
7a485870 | 3393 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
3394 | if ((ret = create_kernel_poll_pipe()) < 0) { |
3395 | goto exit; | |
7a485870 DG |
3396 | } |
3397 | ||
099e26bd DG |
3398 | /* Setup the thread apps communication pipe. */ |
3399 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
3400 | goto exit; | |
3401 | } | |
3402 | ||
3403 | /* Init UST command queue. */ | |
3404 | cds_wfq_init(&ust_cmd_queue.queue); | |
3405 | ||
273ea72c DG |
3406 | /* |
3407 | * Get session list pointer. This pointer MUST NOT be free(). | |
3408 | * This list is statically declared in session.c | |
3409 | */ | |
b5541356 DG |
3410 | session_list_ptr = get_session_list(); |
3411 | ||
5eb91c98 DG |
3412 | /* Set up max poll set size */ |
3413 | lttng_poll_set_max_size(); | |
3414 | ||
cf3af59e | 3415 | /* Create thread to manage the client socket */ |
099e26bd DG |
3416 | ret = pthread_create(&client_thread, NULL, |
3417 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 3418 | if (ret != 0) { |
099e26bd | 3419 | perror("pthread_create clients"); |
cf3af59e MD |
3420 | goto exit_client; |
3421 | } | |
fac6795d | 3422 | |
099e26bd DG |
3423 | /* Create thread to dispatch registration */ |
3424 | ret = pthread_create(&dispatch_thread, NULL, | |
3425 | thread_dispatch_ust_registration, (void *) NULL); | |
3426 | if (ret != 0) { | |
3427 | perror("pthread_create dispatch"); | |
3428 | goto exit_dispatch; | |
3429 | } | |
3430 | ||
3431 | /* Create thread to manage application registration. */ | |
3432 | ret = pthread_create(®_apps_thread, NULL, | |
3433 | thread_registration_apps, (void *) NULL); | |
3434 | if (ret != 0) { | |
3435 | perror("pthread_create registration"); | |
3436 | goto exit_reg_apps; | |
3437 | } | |
3438 | ||
cf3af59e MD |
3439 | /* Create thread to manage application socket */ |
3440 | ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); | |
3441 | if (ret != 0) { | |
099e26bd | 3442 | perror("pthread_create apps"); |
cf3af59e MD |
3443 | goto exit_apps; |
3444 | } | |
fac6795d | 3445 | |
cf3af59e MD |
3446 | /* Create kernel thread to manage kernel event */ |
3447 | ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL); | |
3448 | if (ret != 0) { | |
099e26bd | 3449 | perror("pthread_create kernel"); |
cf3af59e MD |
3450 | goto exit_kernel; |
3451 | } | |
7a485870 | 3452 | |
b25a8868 DG |
3453 | tracepoint(sessiond_boot_end); |
3454 | ||
cf3af59e MD |
3455 | ret = pthread_join(kernel_thread, &status); |
3456 | if (ret != 0) { | |
3457 | perror("pthread_join"); | |
3458 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
3459 | } |
3460 | ||
cf3af59e MD |
3461 | exit_kernel: |
3462 | ret = pthread_join(apps_thread, &status); | |
3463 | if (ret != 0) { | |
3464 | perror("pthread_join"); | |
3465 | goto error; /* join error, exit without cleanup */ | |
3466 | } | |
fac6795d | 3467 | |
cf3af59e | 3468 | exit_apps: |
099e26bd DG |
3469 | ret = pthread_join(reg_apps_thread, &status); |
3470 | if (ret != 0) { | |
3471 | perror("pthread_join"); | |
3472 | goto error; /* join error, exit without cleanup */ | |
3473 | } | |
3474 | ||
3475 | exit_reg_apps: | |
3476 | ret = pthread_join(dispatch_thread, &status); | |
3477 | if (ret != 0) { | |
3478 | perror("pthread_join"); | |
3479 | goto error; /* join error, exit without cleanup */ | |
3480 | } | |
3481 | ||
3482 | exit_dispatch: | |
cf3af59e MD |
3483 | ret = pthread_join(client_thread, &status); |
3484 | if (ret != 0) { | |
3485 | perror("pthread_join"); | |
3486 | goto error; /* join error, exit without cleanup */ | |
3487 | } | |
3488 | ||
3489 | ret = join_kconsumerd_thread(); | |
3490 | if (ret != 0) { | |
3491 | perror("join_kconsumerd"); | |
3492 | goto error; /* join error, exit without cleanup */ | |
3493 | } | |
a88df331 | 3494 | |
cf3af59e | 3495 | exit_client: |
a88df331 | 3496 | exit: |
cf3af59e MD |
3497 | /* |
3498 | * cleanup() is called when no other thread is running. | |
3499 | */ | |
3500 | cleanup(); | |
3501 | if (!ret) | |
3502 | exit(EXIT_SUCCESS); | |
3503 | error: | |
5e16da05 | 3504 | exit(EXIT_FAILURE); |
fac6795d | 3505 | } |