Commit | Line | Data |
---|---|---|
826d496d | 1 | /* |
82a3637f DG |
2 | * liblttngctl.c |
3 | * | |
4 | * Linux Trace Toolkit Control Library | |
5 | * | |
826d496d | 6 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
fac6795d | 7 | * |
82a3637f DG |
8 | * This library is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
fac6795d | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
82a3637f DG |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
fac6795d DG |
21 | */ |
22 | ||
23 | #define _GNU_SOURCE | |
24 | #include <errno.h> | |
25 | #include <grp.h> | |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <unistd.h> | |
30 | ||
5b97ec60 | 31 | #include <lttng/lttng.h> |
fac6795d | 32 | |
e88129fc | 33 | #include <lttng-sessiond-comm.h> |
fac6795d | 34 | #include "lttngerr.h" |
f3ed775e | 35 | #include "lttng-share.h" |
fac6795d DG |
36 | |
37 | /* Socket to session daemon for communication */ | |
38 | static int sessiond_socket; | |
39 | static char sessiond_sock_path[PATH_MAX]; | |
40 | ||
fac6795d DG |
41 | /* Variables */ |
42 | static char *tracing_group; | |
43 | static int connected; | |
44 | ||
99497cd0 MD |
45 | /* |
46 | * Copy string from src to dst and enforce null terminated byte. | |
47 | */ | |
48 | static void copy_string(char *dst, const char *src, size_t len) | |
49 | { | |
e7d6716d | 50 | if (src && dst) { |
99497cd0 MD |
51 | strncpy(dst, src, len); |
52 | /* Enforce the NULL terminated byte */ | |
53 | dst[len - 1] = '\0'; | |
cd80958d DG |
54 | } else if (dst) { |
55 | dst[0] = '\0'; | |
99497cd0 MD |
56 | } |
57 | } | |
58 | ||
fac6795d | 59 | /* |
cd80958d | 60 | * Copy domain to lttcomm_session_msg domain. |
fac6795d | 61 | * |
cd80958d DG |
62 | * If domain is unknown, default domain will be the kernel. |
63 | */ | |
64 | static void copy_lttng_domain(struct lttng_domain *dst, struct lttng_domain *src) | |
65 | { | |
66 | if (src && dst) { | |
67 | switch (src->type) { | |
68 | case LTTNG_DOMAIN_KERNEL: | |
69 | case LTTNG_DOMAIN_UST: | |
70 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
71 | case LTTNG_DOMAIN_UST_PID: | |
72 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
73 | memcpy(dst, src, sizeof(struct lttng_domain)); | |
74 | break; | |
75 | default: | |
76 | dst->type = LTTNG_DOMAIN_KERNEL; | |
77 | break; | |
78 | } | |
79 | } | |
80 | } | |
81 | ||
82 | /* | |
83 | * Send lttcomm_session_msg to the session daemon. | |
fac6795d | 84 | * |
cd80958d DG |
85 | * On success, return 0 |
86 | * On error, return error code | |
fac6795d | 87 | */ |
cd80958d | 88 | static int send_session_msg(struct lttcomm_session_msg *lsm) |
fac6795d DG |
89 | { |
90 | int ret; | |
91 | ||
92 | if (!connected) { | |
e065084a DG |
93 | ret = -ENOTCONN; |
94 | goto end; | |
fac6795d DG |
95 | } |
96 | ||
cd80958d DG |
97 | ret = lttcomm_send_unix_sock(sessiond_socket, lsm, |
98 | sizeof(struct lttcomm_session_msg)); | |
e065084a DG |
99 | |
100 | end: | |
101 | return ret; | |
102 | } | |
103 | ||
104 | /* | |
cd80958d | 105 | * Receive data from the sessiond socket. |
e065084a | 106 | * |
cd80958d DG |
107 | * On success, return 0 |
108 | * On error, return recv() error code | |
e065084a | 109 | */ |
ca95a216 | 110 | static int recv_data_sessiond(void *buf, size_t len) |
e065084a DG |
111 | { |
112 | int ret; | |
113 | ||
114 | if (!connected) { | |
115 | ret = -ENOTCONN; | |
116 | goto end; | |
fac6795d DG |
117 | } |
118 | ||
ca95a216 | 119 | ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len); |
fac6795d | 120 | |
e065084a | 121 | end: |
fac6795d DG |
122 | return ret; |
123 | } | |
124 | ||
125 | /* | |
947308c4 | 126 | * Check if the specified group name exist. |
65beb5ff | 127 | * |
2269e89e | 128 | * If yes return 1, else return -1. |
947308c4 DG |
129 | */ |
130 | static int check_tracing_group(const char *grp_name) | |
131 | { | |
132 | struct group *grp_tracing; /* no free(). See getgrnam(3) */ | |
133 | gid_t *grp_list; | |
134 | int grp_list_size, grp_id, i; | |
135 | int ret = -1; | |
136 | ||
137 | /* Get GID of group 'tracing' */ | |
138 | grp_tracing = getgrnam(grp_name); | |
139 | if (grp_tracing == NULL) { | |
140 | /* NULL means not found also. getgrnam(3) */ | |
141 | if (errno != 0) { | |
142 | perror("getgrnam"); | |
143 | } | |
144 | goto end; | |
145 | } | |
146 | ||
147 | /* Get number of supplementary group IDs */ | |
148 | grp_list_size = getgroups(0, NULL); | |
149 | if (grp_list_size < 0) { | |
150 | perror("getgroups"); | |
151 | goto end; | |
152 | } | |
153 | ||
154 | /* Alloc group list of the right size */ | |
155 | grp_list = malloc(grp_list_size * sizeof(gid_t)); | |
00795392 MD |
156 | if (!grp_list) { |
157 | ret = -1; | |
158 | goto end; | |
159 | } | |
947308c4 DG |
160 | grp_id = getgroups(grp_list_size, grp_list); |
161 | if (grp_id < -1) { | |
162 | perror("getgroups"); | |
163 | goto free_list; | |
164 | } | |
165 | ||
166 | for (i = 0; i < grp_list_size; i++) { | |
167 | if (grp_list[i] == grp_tracing->gr_gid) { | |
2269e89e | 168 | ret = 1; |
947308c4 DG |
169 | break; |
170 | } | |
171 | } | |
172 | ||
173 | free_list: | |
174 | free(grp_list); | |
175 | ||
176 | end: | |
177 | return ret; | |
178 | } | |
179 | ||
180 | /* | |
2269e89e DG |
181 | * Try connect to session daemon with sock_path. |
182 | * | |
183 | * Return 0 on success, else -1 | |
184 | */ | |
185 | static int try_connect_sessiond(const char *sock_path) | |
186 | { | |
187 | int ret; | |
188 | ||
189 | /* If socket exist, we check if the daemon listens for connect. */ | |
190 | ret = access(sock_path, F_OK); | |
191 | if (ret < 0) { | |
192 | /* Not alive */ | |
193 | return -1; | |
194 | } | |
195 | ||
196 | ret = lttcomm_connect_unix_sock(sock_path); | |
197 | if (ret < 0) { | |
198 | /* Not alive */ | |
199 | return -1; | |
200 | } | |
201 | ||
202 | ret = lttcomm_close_unix_sock(ret); | |
203 | if (ret < 0) { | |
204 | perror("lttcomm_close_unix_sock"); | |
205 | } | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
210 | /* | |
211 | * Set sessiond socket path by putting it in the global sessiond_sock_path | |
212 | * variable. | |
947308c4 DG |
213 | */ |
214 | static int set_session_daemon_path(void) | |
215 | { | |
216 | int ret; | |
2269e89e DG |
217 | int in_tgroup = 0; /* In tracing group */ |
218 | uid_t uid; | |
219 | ||
220 | uid = getuid(); | |
947308c4 | 221 | |
2269e89e DG |
222 | if (uid != 0) { |
223 | /* Are we in the tracing group ? */ | |
224 | in_tgroup = check_tracing_group(tracing_group); | |
225 | } | |
226 | ||
227 | if (uid == 0) { | |
228 | /* Root */ | |
229 | copy_string(sessiond_sock_path, | |
230 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, | |
231 | sizeof(sessiond_sock_path)); | |
232 | } else if (in_tgroup) { | |
233 | /* Tracing group */ | |
234 | copy_string(sessiond_sock_path, | |
235 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, | |
236 | sizeof(sessiond_sock_path)); | |
237 | ||
238 | ret = try_connect_sessiond(sessiond_sock_path); | |
239 | if (ret < 0) { | |
240 | /* Global session daemon not available */ | |
241 | if (snprintf(sessiond_sock_path, sizeof(sessiond_sock_path), | |
242 | DEFAULT_HOME_CLIENT_UNIX_SOCK, | |
243 | getenv("HOME")) < 0) { | |
244 | return -ENOMEM; | |
245 | } | |
246 | } | |
247 | } else { | |
248 | /* Not in tracing group and not root, default */ | |
99497cd0 | 249 | if (snprintf(sessiond_sock_path, PATH_MAX, |
cd80958d DG |
250 | DEFAULT_HOME_CLIENT_UNIX_SOCK, |
251 | getenv("HOME")) < 0) { | |
947308c4 DG |
252 | return -ENOMEM; |
253 | } | |
947308c4 DG |
254 | } |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
65beb5ff DG |
259 | /* |
260 | * Connect to the LTTng session daemon. | |
261 | * | |
262 | * On success, return 0. On error, return -1. | |
263 | */ | |
264 | static int connect_sessiond(void) | |
265 | { | |
266 | int ret; | |
267 | ||
268 | ret = set_session_daemon_path(); | |
269 | if (ret < 0) { | |
270 | return ret; | |
271 | } | |
272 | ||
273 | /* Connect to the sesssion daemon */ | |
274 | ret = lttcomm_connect_unix_sock(sessiond_sock_path); | |
275 | if (ret < 0) { | |
276 | return ret; | |
277 | } | |
278 | ||
279 | sessiond_socket = ret; | |
280 | connected = 1; | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | /* | |
286 | * Clean disconnect the session daemon. | |
287 | */ | |
288 | static int disconnect_sessiond(void) | |
289 | { | |
290 | int ret = 0; | |
291 | ||
292 | if (connected) { | |
293 | ret = lttcomm_close_unix_sock(sessiond_socket); | |
294 | sessiond_socket = 0; | |
295 | connected = 0; | |
296 | } | |
297 | ||
298 | return ret; | |
299 | } | |
300 | ||
35a6fdb7 | 301 | /* |
cd80958d | 302 | * Ask the session daemon a specific command and put the data into buf. |
65beb5ff | 303 | * |
cd80958d | 304 | * Return size of data (only payload, not header). |
65beb5ff | 305 | */ |
cd80958d | 306 | static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf) |
65beb5ff DG |
307 | { |
308 | int ret; | |
309 | size_t size; | |
310 | void *data = NULL; | |
cd80958d | 311 | struct lttcomm_lttng_msg llm; |
65beb5ff DG |
312 | |
313 | ret = connect_sessiond(); | |
314 | if (ret < 0) { | |
315 | goto end; | |
316 | } | |
317 | ||
65beb5ff | 318 | /* Send command to session daemon */ |
cd80958d | 319 | ret = send_session_msg(lsm); |
65beb5ff DG |
320 | if (ret < 0) { |
321 | goto end; | |
322 | } | |
323 | ||
324 | /* Get header from data transmission */ | |
325 | ret = recv_data_sessiond(&llm, sizeof(llm)); | |
326 | if (ret < 0) { | |
327 | goto end; | |
328 | } | |
329 | ||
330 | /* Check error code if OK */ | |
331 | if (llm.ret_code != LTTCOMM_OK) { | |
332 | ret = -llm.ret_code; | |
333 | goto end; | |
334 | } | |
335 | ||
336 | size = llm.data_size; | |
337 | if (size == 0) { | |
7d29a247 | 338 | ret = 0; |
65beb5ff DG |
339 | goto end; |
340 | } | |
341 | ||
342 | data = (void*) malloc(size); | |
343 | ||
344 | /* Get payload data */ | |
345 | ret = recv_data_sessiond(data, size); | |
346 | if (ret < 0) { | |
347 | free(data); | |
348 | goto end; | |
349 | } | |
350 | ||
351 | *buf = data; | |
352 | ret = size; | |
353 | ||
354 | end: | |
355 | disconnect_sessiond(); | |
356 | return ret; | |
357 | } | |
358 | ||
9f19cc17 | 359 | /* |
cd80958d | 360 | * Create lttng handle and return pointer. |
9f19cc17 | 361 | */ |
cd80958d DG |
362 | struct lttng_handle *lttng_create_handle(const char *session_name, |
363 | struct lttng_domain *domain) | |
9f19cc17 | 364 | { |
cd80958d DG |
365 | struct lttng_handle *handle; |
366 | ||
367 | handle = malloc(sizeof(struct lttng_handle)); | |
368 | if (handle == NULL) { | |
369 | perror("malloc handle"); | |
370 | goto end; | |
371 | } | |
372 | ||
373 | /* Copy session name */ | |
374 | copy_string(handle->session_name, session_name, | |
375 | sizeof(handle->session_name)); | |
376 | ||
377 | /* Copy lttng domain */ | |
378 | copy_lttng_domain(&handle->domain, domain); | |
379 | ||
380 | end: | |
381 | return handle; | |
382 | } | |
383 | ||
384 | /* | |
385 | * Destroy handle by free(3) the pointer. | |
386 | */ | |
387 | void lttng_destroy_handle(struct lttng_handle *handle) | |
388 | { | |
389 | if (handle) { | |
390 | free(handle); | |
eb354453 DG |
391 | } |
392 | } | |
393 | ||
d9800920 DG |
394 | /* |
395 | * Register an outside consumer. | |
396 | */ | |
397 | int lttng_register_consumer(struct lttng_handle *handle, | |
398 | const char *socket_path) | |
399 | { | |
400 | struct lttcomm_session_msg lsm; | |
401 | ||
402 | lsm.cmd_type = LTTNG_REGISTER_CONSUMER; | |
403 | copy_string(lsm.session.name, handle->session_name, | |
404 | sizeof(lsm.session.name)); | |
405 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
406 | ||
407 | copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path)); | |
408 | ||
409 | return ask_sessiond(&lsm, NULL); | |
410 | } | |
411 | ||
1df4dedd | 412 | /* |
f3ed775e | 413 | * Start tracing for all trace of the session. |
1df4dedd | 414 | */ |
cd80958d | 415 | int lttng_start_tracing(struct lttng_handle *handle) |
f3ed775e | 416 | { |
cd80958d DG |
417 | struct lttcomm_session_msg lsm; |
418 | ||
419 | if (!handle) { | |
420 | return -1; | |
421 | } | |
422 | ||
423 | lsm.cmd_type = LTTNG_START_TRACE; | |
424 | copy_string(lsm.session.name, handle->session_name, | |
425 | sizeof(lsm.session.name)); | |
426 | ||
427 | return ask_sessiond(&lsm, NULL); | |
f3ed775e | 428 | } |
1df4dedd DG |
429 | |
430 | /* | |
f3ed775e DG |
431 | * Stop tracing for all trace of the session. |
432 | */ | |
cd80958d | 433 | int lttng_stop_tracing(struct lttng_handle *handle) |
f3ed775e | 434 | { |
cd80958d DG |
435 | struct lttcomm_session_msg lsm; |
436 | ||
437 | lsm.cmd_type = LTTNG_STOP_TRACE; | |
438 | copy_string(lsm.session.name, handle->session_name, | |
439 | sizeof(lsm.session.name)); | |
440 | ||
441 | return ask_sessiond(&lsm, NULL); | |
f3ed775e DG |
442 | } |
443 | ||
444 | /* | |
cd80958d | 445 | * Add context to event or/and channel. |
1df4dedd | 446 | */ |
cd80958d | 447 | int lttng_add_context(struct lttng_handle *handle, |
38057ed1 DG |
448 | struct lttng_event_context *ctx, const char *event_name, |
449 | const char *channel_name) | |
d65106b1 | 450 | { |
cd80958d DG |
451 | struct lttcomm_session_msg lsm; |
452 | ||
453 | if (!handle) { | |
454 | return -1; | |
455 | } | |
456 | ||
457 | lsm.cmd_type = LTTNG_ADD_CONTEXT; | |
458 | ||
459 | /* Copy channel name */ | |
460 | copy_string(lsm.u.context.channel_name, channel_name, | |
461 | sizeof(lsm.u.context.channel_name)); | |
462 | /* Copy event name */ | |
463 | copy_string(lsm.u.context.event_name, event_name, | |
464 | sizeof(lsm.u.context.event_name)); | |
465 | ||
466 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
d65106b1 | 467 | |
eb354453 DG |
468 | if (ctx) { |
469 | memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); | |
d65106b1 DG |
470 | } |
471 | ||
cd80958d DG |
472 | copy_string(lsm.session.name, handle->session_name, |
473 | sizeof(lsm.session.name)); | |
474 | ||
475 | return ask_sessiond(&lsm, NULL); | |
d65106b1 DG |
476 | } |
477 | ||
f3ed775e | 478 | /* |
cd80958d | 479 | * Enable event |
f3ed775e | 480 | */ |
cd80958d | 481 | int lttng_enable_event(struct lttng_handle *handle, |
38057ed1 | 482 | struct lttng_event *ev, const char *channel_name) |
1df4dedd | 483 | { |
cd80958d DG |
484 | struct lttcomm_session_msg lsm; |
485 | ||
486 | if (!handle) { | |
487 | return -1; | |
488 | } | |
33a2b854 | 489 | |
94cf3c47 | 490 | if (channel_name == NULL) { |
cd80958d DG |
491 | copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME, |
492 | sizeof(lsm.u.enable.channel_name)); | |
33a2b854 | 493 | } else { |
cd80958d DG |
494 | copy_string(lsm.u.enable.channel_name, channel_name, |
495 | sizeof(lsm.u.enable.channel_name)); | |
eb354453 DG |
496 | } |
497 | ||
cd80958d | 498 | copy_lttng_domain(&lsm.domain, &handle->domain); |
0d0c377a | 499 | |
cd80958d DG |
500 | if (ev) { |
501 | lsm.cmd_type = LTTNG_ENABLE_EVENT; | |
502 | memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event)); | |
0d0c377a | 503 | } else { |
cd80958d | 504 | lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT; |
f3ed775e DG |
505 | } |
506 | ||
cd80958d DG |
507 | copy_string(lsm.session.name, handle->session_name, |
508 | sizeof(lsm.session.name)); | |
509 | ||
510 | return ask_sessiond(&lsm, NULL); | |
1df4dedd DG |
511 | } |
512 | ||
513 | /* | |
f5177a38 | 514 | * Disable event of a channel and domain. |
1df4dedd | 515 | */ |
cd80958d | 516 | int lttng_disable_event(struct lttng_handle *handle, const char *name, |
38057ed1 | 517 | const char *channel_name) |
1df4dedd | 518 | { |
cd80958d | 519 | struct lttcomm_session_msg lsm; |
1df4dedd | 520 | |
cd80958d DG |
521 | if (!handle) { |
522 | return -1; | |
523 | } | |
524 | ||
525 | if (channel_name) { | |
526 | copy_string(lsm.u.disable.channel_name, channel_name, | |
527 | sizeof(lsm.u.disable.channel_name)); | |
f3ed775e | 528 | } else { |
cd80958d DG |
529 | copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME, |
530 | sizeof(lsm.u.disable.channel_name)); | |
eb354453 DG |
531 | } |
532 | ||
cd80958d | 533 | copy_lttng_domain(&lsm.domain, &handle->domain); |
f5177a38 DG |
534 | |
535 | if (name == NULL) { | |
cd80958d DG |
536 | copy_string(lsm.u.disable.name, name, sizeof(lsm.u.disable.name)); |
537 | lsm.cmd_type = LTTNG_DISABLE_EVENT; | |
f5177a38 | 538 | } else { |
cd80958d | 539 | lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT; |
f3ed775e DG |
540 | } |
541 | ||
cd80958d DG |
542 | copy_string(lsm.session.name, handle->session_name, |
543 | sizeof(lsm.session.name)); | |
544 | ||
545 | return ask_sessiond(&lsm, NULL); | |
1df4dedd DG |
546 | } |
547 | ||
548 | /* | |
0d0c377a | 549 | * Enable channel per domain |
a5c5a2bd | 550 | */ |
cd80958d | 551 | int lttng_enable_channel(struct lttng_handle *handle, |
38057ed1 | 552 | struct lttng_channel *chan) |
a5c5a2bd | 553 | { |
cd80958d DG |
554 | struct lttcomm_session_msg lsm; |
555 | ||
556 | if (!handle) { | |
557 | return -1; | |
558 | } | |
559 | ||
eb354453 | 560 | if (chan) { |
cd80958d | 561 | memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan)); |
eb354453 | 562 | } |
7d29a247 | 563 | |
cd80958d DG |
564 | lsm.cmd_type = LTTNG_ENABLE_CHANNEL; |
565 | ||
566 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
7d29a247 | 567 | |
cd80958d DG |
568 | copy_string(lsm.session.name, handle->session_name, |
569 | sizeof(lsm.session.name)); | |
570 | ||
571 | return ask_sessiond(&lsm, NULL); | |
8c0faa1d | 572 | } |
1df4dedd | 573 | |
2ef84c95 | 574 | /* |
0b97ec54 | 575 | * All tracing will be stopped for registered events of the channel. |
2ef84c95 | 576 | */ |
cd80958d | 577 | int lttng_disable_channel(struct lttng_handle *handle, const char *name) |
2ef84c95 | 578 | { |
cd80958d DG |
579 | struct lttcomm_session_msg lsm; |
580 | ||
581 | if (!handle) { | |
582 | return -1; | |
583 | } | |
584 | ||
585 | if (name) { | |
586 | copy_string(lsm.u.disable.channel_name, name, | |
587 | sizeof(lsm.u.disable.channel_name)); | |
588 | } | |
589 | ||
590 | lsm.cmd_type = LTTNG_DISABLE_CHANNEL; | |
1df4dedd | 591 | |
cd80958d DG |
592 | copy_lttng_domain(&lsm.domain, &handle->domain); |
593 | ||
594 | copy_string(lsm.session.name, handle->session_name, | |
595 | sizeof(lsm.session.name)); | |
596 | ||
597 | return ask_sessiond(&lsm, NULL); | |
ca95a216 DG |
598 | } |
599 | ||
fac6795d | 600 | /* |
2a71efd5 | 601 | * List all available tracepoints of domain. |
fac6795d | 602 | * |
2a71efd5 | 603 | * Return the size (bytes) of the list and set the events array. |
7d29a247 | 604 | * On error, return negative value. |
fac6795d | 605 | */ |
cd80958d | 606 | int lttng_list_tracepoints(struct lttng_handle *handle, |
2a71efd5 | 607 | struct lttng_event **events) |
fac6795d | 608 | { |
052da939 | 609 | int ret; |
cd80958d DG |
610 | struct lttcomm_session_msg lsm; |
611 | ||
612 | if (!handle) { | |
613 | return -1; | |
614 | } | |
fac6795d | 615 | |
cd80958d DG |
616 | lsm.cmd_type = LTTNG_LIST_TRACEPOINTS; |
617 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
2a71efd5 | 618 | |
cd80958d | 619 | ret = ask_sessiond(&lsm, (void **) events); |
052da939 DG |
620 | if (ret < 0) { |
621 | return ret; | |
eb354453 | 622 | } |
fac6795d | 623 | |
9f19cc17 | 624 | return ret / sizeof(struct lttng_event); |
fac6795d DG |
625 | } |
626 | ||
1657e9bb | 627 | /* |
7d29a247 | 628 | * Return a human readable string of code |
1657e9bb | 629 | */ |
7d29a247 | 630 | const char *lttng_get_readable_code(int code) |
1657e9bb | 631 | { |
7d29a247 DG |
632 | if (code > -LTTCOMM_OK) { |
633 | return "Ended with errors"; | |
1657e9bb DG |
634 | } |
635 | ||
7d29a247 | 636 | return lttcomm_get_readable_code(code); |
1657e9bb DG |
637 | } |
638 | ||
aaf97519 | 639 | /* |
894be886 | 640 | * Create a brand new session using name. |
aaf97519 | 641 | */ |
38057ed1 | 642 | int lttng_create_session(const char *name, const char *path) |
aaf97519 | 643 | { |
cd80958d DG |
644 | struct lttcomm_session_msg lsm; |
645 | ||
646 | lsm.cmd_type = LTTNG_CREATE_SESSION; | |
647 | copy_string(lsm.session.name, name, sizeof(lsm.session.name)); | |
648 | copy_string(lsm.session.path, path, sizeof(lsm.session.path)); | |
649 | ||
650 | return ask_sessiond(&lsm, NULL); | |
8028d920 DG |
651 | } |
652 | ||
653 | /* | |
8028d920 DG |
654 | * Destroy session using name. |
655 | */ | |
cd80958d | 656 | int lttng_destroy_session(struct lttng_handle *handle) |
8028d920 | 657 | { |
cd80958d DG |
658 | struct lttcomm_session_msg lsm; |
659 | ||
660 | if (!handle) { | |
661 | return -1; | |
662 | } | |
663 | ||
664 | lsm.cmd_type = LTTNG_DESTROY_SESSION; | |
665 | copy_string(lsm.session.name, handle->session_name, | |
666 | sizeof(lsm.session.name)); | |
667 | ||
668 | return ask_sessiond(&lsm, NULL); | |
aaf97519 DG |
669 | } |
670 | ||
57167058 | 671 | /* |
57167058 DG |
672 | * Ask the session daemon for all available sessions. |
673 | * | |
ca95a216 DG |
674 | * Return number of session. |
675 | * On error, return negative value. | |
57167058 | 676 | */ |
ca95a216 | 677 | int lttng_list_sessions(struct lttng_session **sessions) |
57167058 | 678 | { |
ca95a216 | 679 | int ret; |
cd80958d | 680 | struct lttcomm_session_msg lsm; |
57167058 | 681 | |
cd80958d DG |
682 | lsm.cmd_type = LTTNG_LIST_SESSIONS; |
683 | ret = ask_sessiond(&lsm, (void**) sessions); | |
57167058 | 684 | if (ret < 0) { |
ca95a216 | 685 | return ret; |
57167058 DG |
686 | } |
687 | ||
ca95a216 | 688 | return ret / sizeof(struct lttng_session); |
57167058 DG |
689 | } |
690 | ||
9f19cc17 DG |
691 | /* |
692 | * List domain of a session. | |
693 | */ | |
cd80958d DG |
694 | int lttng_list_domains(struct lttng_handle *handle, |
695 | struct lttng_domain **domains) | |
9f19cc17 DG |
696 | { |
697 | int ret; | |
cd80958d DG |
698 | struct lttcomm_session_msg lsm; |
699 | ||
700 | if (!handle) { | |
701 | return -1; | |
702 | } | |
9f19cc17 | 703 | |
cd80958d DG |
704 | lsm.cmd_type = LTTNG_LIST_DOMAINS; |
705 | ||
706 | copy_string(lsm.session.name, handle->session_name, | |
707 | sizeof(lsm.session.name)); | |
708 | ||
709 | ret = ask_sessiond(&lsm, (void**) domains); | |
9f19cc17 DG |
710 | if (ret < 0) { |
711 | return ret; | |
712 | } | |
713 | ||
714 | return ret / sizeof(struct lttng_domain); | |
715 | } | |
716 | ||
717 | /* | |
718 | * List channels of a session | |
719 | */ | |
cd80958d DG |
720 | int lttng_list_channels(struct lttng_handle *handle, |
721 | struct lttng_channel **channels) | |
9f19cc17 DG |
722 | { |
723 | int ret; | |
cd80958d DG |
724 | struct lttcomm_session_msg lsm; |
725 | ||
726 | if (!handle) { | |
727 | return -1; | |
728 | } | |
729 | ||
730 | lsm.cmd_type = LTTNG_LIST_CHANNELS; | |
731 | copy_string(lsm.session.name, handle->session_name, | |
732 | sizeof(lsm.session.name)); | |
9f19cc17 | 733 | |
cd80958d | 734 | copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 735 | |
cd80958d | 736 | ret = ask_sessiond(&lsm, (void**) channels); |
9f19cc17 DG |
737 | if (ret < 0) { |
738 | return ret; | |
739 | } | |
740 | ||
741 | return ret / sizeof(struct lttng_channel); | |
742 | } | |
743 | ||
744 | /* | |
745 | * List events of a session channel. | |
746 | */ | |
cd80958d DG |
747 | int lttng_list_events(struct lttng_handle *handle, |
748 | const char *channel_name, struct lttng_event **events) | |
9f19cc17 DG |
749 | { |
750 | int ret; | |
cd80958d | 751 | struct lttcomm_session_msg lsm; |
9f19cc17 | 752 | |
cd80958d DG |
753 | if (!handle) { |
754 | return -1; | |
755 | } | |
756 | ||
757 | lsm.cmd_type = LTTNG_LIST_EVENTS; | |
758 | copy_string(lsm.session.name, handle->session_name, | |
759 | sizeof(lsm.session.name)); | |
760 | copy_string(lsm.u.list.channel_name, channel_name, | |
761 | sizeof(lsm.u.list.channel_name)); | |
762 | ||
763 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
9f19cc17 | 764 | |
cd80958d | 765 | ret = ask_sessiond(&lsm, (void**) events); |
9f19cc17 DG |
766 | if (ret < 0) { |
767 | return ret; | |
768 | } | |
769 | ||
770 | return ret / sizeof(struct lttng_event); | |
771 | } | |
772 | ||
fac6795d DG |
773 | /* |
774 | * lttng_set_tracing_group | |
775 | * | |
776 | * Set tracing group variable with name. This function | |
777 | * allocate memory pointed by tracing_group. | |
778 | */ | |
779 | int lttng_set_tracing_group(const char *name) | |
780 | { | |
781 | if (asprintf(&tracing_group, "%s", name) < 0) { | |
782 | return -ENOMEM; | |
783 | } | |
784 | ||
785 | return 0; | |
786 | } | |
787 | ||
d0254c7c MD |
788 | /* |
789 | * lttng_calibrate | |
790 | */ | |
cd80958d | 791 | int lttng_calibrate(struct lttng_handle *handle, |
d0254c7c MD |
792 | struct lttng_calibrate *calibrate) |
793 | { | |
cd80958d | 794 | struct lttcomm_session_msg lsm; |
d0254c7c | 795 | |
cd80958d DG |
796 | if (!handle) { |
797 | return -1; | |
798 | } | |
d0254c7c | 799 | |
cd80958d DG |
800 | lsm.cmd_type = LTTNG_CALIBRATE; |
801 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
d0254c7c | 802 | |
cd80958d DG |
803 | memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate)); |
804 | ||
805 | return ask_sessiond(&lsm, NULL); | |
d0254c7c MD |
806 | } |
807 | ||
fac6795d | 808 | /* |
2269e89e | 809 | * Check if session daemon is alive. |
fac6795d | 810 | * |
2269e89e DG |
811 | * Return 1 if alive or 0 if not. |
812 | * On error return -1 | |
fac6795d | 813 | */ |
947308c4 | 814 | int lttng_session_daemon_alive(void) |
fac6795d DG |
815 | { |
816 | int ret; | |
817 | ||
818 | ret = set_session_daemon_path(); | |
819 | if (ret < 0) { | |
947308c4 | 820 | /* Error */ |
fac6795d DG |
821 | return ret; |
822 | } | |
823 | ||
2269e89e DG |
824 | if (strlen(sessiond_sock_path) == 0) { |
825 | /* No socket path set. Weird error */ | |
826 | return -1; | |
fac6795d DG |
827 | } |
828 | ||
2269e89e | 829 | ret = try_connect_sessiond(sessiond_sock_path); |
7d8234d9 MD |
830 | if (ret < 0) { |
831 | /* Not alive */ | |
832 | return 0; | |
833 | } | |
7d8234d9 | 834 | |
947308c4 DG |
835 | /* Is alive */ |
836 | return 1; | |
fac6795d DG |
837 | } |
838 | ||
839 | /* | |
840 | * lib constructor | |
841 | */ | |
842 | static void __attribute__((constructor)) init() | |
843 | { | |
844 | /* Set default session group */ | |
64a23ac4 | 845 | lttng_set_tracing_group(LTTNG_DEFAULT_TRACING_GROUP); |
fac6795d | 846 | } |