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 DG |
127 | * |
128 | * If yes return 0, 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)); | |
156 | grp_id = getgroups(grp_list_size, grp_list); | |
157 | if (grp_id < -1) { | |
158 | perror("getgroups"); | |
159 | goto free_list; | |
160 | } | |
161 | ||
162 | for (i = 0; i < grp_list_size; i++) { | |
163 | if (grp_list[i] == grp_tracing->gr_gid) { | |
164 | ret = 0; | |
165 | break; | |
166 | } | |
167 | } | |
168 | ||
169 | free_list: | |
170 | free(grp_list); | |
171 | ||
172 | end: | |
173 | return ret; | |
174 | } | |
175 | ||
176 | /* | |
65beb5ff DG |
177 | * Set sessiond socket path by putting it in the global sessiond_sock_path |
178 | * variable. | |
947308c4 DG |
179 | */ |
180 | static int set_session_daemon_path(void) | |
181 | { | |
182 | int ret; | |
183 | ||
184 | /* Are we in the tracing group ? */ | |
185 | ret = check_tracing_group(tracing_group); | |
186 | if (ret < 0 && getuid() != 0) { | |
99497cd0 | 187 | if (snprintf(sessiond_sock_path, PATH_MAX, |
cd80958d DG |
188 | DEFAULT_HOME_CLIENT_UNIX_SOCK, |
189 | getenv("HOME")) < 0) { | |
947308c4 DG |
190 | return -ENOMEM; |
191 | } | |
192 | } else { | |
cd80958d DG |
193 | copy_string(sessiond_sock_path, |
194 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, | |
195 | PATH_MAX); | |
947308c4 DG |
196 | } |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
65beb5ff DG |
201 | /* |
202 | * Connect to the LTTng session daemon. | |
203 | * | |
204 | * On success, return 0. On error, return -1. | |
205 | */ | |
206 | static int connect_sessiond(void) | |
207 | { | |
208 | int ret; | |
209 | ||
210 | ret = set_session_daemon_path(); | |
211 | if (ret < 0) { | |
212 | return ret; | |
213 | } | |
214 | ||
215 | /* Connect to the sesssion daemon */ | |
216 | ret = lttcomm_connect_unix_sock(sessiond_sock_path); | |
217 | if (ret < 0) { | |
218 | return ret; | |
219 | } | |
220 | ||
221 | sessiond_socket = ret; | |
222 | connected = 1; | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | /* | |
228 | * Clean disconnect the session daemon. | |
229 | */ | |
230 | static int disconnect_sessiond(void) | |
231 | { | |
232 | int ret = 0; | |
233 | ||
234 | if (connected) { | |
235 | ret = lttcomm_close_unix_sock(sessiond_socket); | |
236 | sessiond_socket = 0; | |
237 | connected = 0; | |
238 | } | |
239 | ||
240 | return ret; | |
241 | } | |
242 | ||
35a6fdb7 | 243 | /* |
cd80958d | 244 | * Ask the session daemon a specific command and put the data into buf. |
65beb5ff | 245 | * |
cd80958d | 246 | * Return size of data (only payload, not header). |
65beb5ff | 247 | */ |
cd80958d | 248 | static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf) |
65beb5ff DG |
249 | { |
250 | int ret; | |
251 | size_t size; | |
252 | void *data = NULL; | |
cd80958d | 253 | struct lttcomm_lttng_msg llm; |
65beb5ff DG |
254 | |
255 | ret = connect_sessiond(); | |
256 | if (ret < 0) { | |
257 | goto end; | |
258 | } | |
259 | ||
65beb5ff | 260 | /* Send command to session daemon */ |
cd80958d | 261 | ret = send_session_msg(lsm); |
65beb5ff DG |
262 | if (ret < 0) { |
263 | goto end; | |
264 | } | |
265 | ||
266 | /* Get header from data transmission */ | |
267 | ret = recv_data_sessiond(&llm, sizeof(llm)); | |
268 | if (ret < 0) { | |
269 | goto end; | |
270 | } | |
271 | ||
272 | /* Check error code if OK */ | |
273 | if (llm.ret_code != LTTCOMM_OK) { | |
274 | ret = -llm.ret_code; | |
275 | goto end; | |
276 | } | |
277 | ||
278 | size = llm.data_size; | |
279 | if (size == 0) { | |
7d29a247 | 280 | ret = 0; |
65beb5ff DG |
281 | goto end; |
282 | } | |
283 | ||
284 | data = (void*) malloc(size); | |
285 | ||
286 | /* Get payload data */ | |
287 | ret = recv_data_sessiond(data, size); | |
288 | if (ret < 0) { | |
289 | free(data); | |
290 | goto end; | |
291 | } | |
292 | ||
293 | *buf = data; | |
294 | ret = size; | |
295 | ||
296 | end: | |
297 | disconnect_sessiond(); | |
298 | return ret; | |
299 | } | |
300 | ||
9f19cc17 | 301 | /* |
cd80958d | 302 | * Create lttng handle and return pointer. |
9f19cc17 | 303 | */ |
cd80958d DG |
304 | struct lttng_handle *lttng_create_handle(const char *session_name, |
305 | struct lttng_domain *domain) | |
9f19cc17 | 306 | { |
cd80958d DG |
307 | struct lttng_handle *handle; |
308 | ||
309 | handle = malloc(sizeof(struct lttng_handle)); | |
310 | if (handle == NULL) { | |
311 | perror("malloc handle"); | |
312 | goto end; | |
313 | } | |
314 | ||
315 | /* Copy session name */ | |
316 | copy_string(handle->session_name, session_name, | |
317 | sizeof(handle->session_name)); | |
318 | ||
319 | /* Copy lttng domain */ | |
320 | copy_lttng_domain(&handle->domain, domain); | |
321 | ||
322 | end: | |
323 | return handle; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Destroy handle by free(3) the pointer. | |
328 | */ | |
329 | void lttng_destroy_handle(struct lttng_handle *handle) | |
330 | { | |
331 | if (handle) { | |
332 | free(handle); | |
eb354453 DG |
333 | } |
334 | } | |
335 | ||
d9800920 DG |
336 | /* |
337 | * Register an outside consumer. | |
338 | */ | |
339 | int lttng_register_consumer(struct lttng_handle *handle, | |
340 | const char *socket_path) | |
341 | { | |
342 | struct lttcomm_session_msg lsm; | |
343 | ||
344 | lsm.cmd_type = LTTNG_REGISTER_CONSUMER; | |
345 | copy_string(lsm.session.name, handle->session_name, | |
346 | sizeof(lsm.session.name)); | |
347 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
348 | ||
349 | copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path)); | |
350 | ||
351 | return ask_sessiond(&lsm, NULL); | |
352 | } | |
353 | ||
1df4dedd | 354 | /* |
f3ed775e | 355 | * Start tracing for all trace of the session. |
1df4dedd | 356 | */ |
cd80958d | 357 | int lttng_start_tracing(struct lttng_handle *handle) |
f3ed775e | 358 | { |
cd80958d DG |
359 | struct lttcomm_session_msg lsm; |
360 | ||
361 | if (!handle) { | |
362 | return -1; | |
363 | } | |
364 | ||
365 | lsm.cmd_type = LTTNG_START_TRACE; | |
366 | copy_string(lsm.session.name, handle->session_name, | |
367 | sizeof(lsm.session.name)); | |
368 | ||
369 | return ask_sessiond(&lsm, NULL); | |
f3ed775e | 370 | } |
1df4dedd DG |
371 | |
372 | /* | |
f3ed775e DG |
373 | * Stop tracing for all trace of the session. |
374 | */ | |
cd80958d | 375 | int lttng_stop_tracing(struct lttng_handle *handle) |
f3ed775e | 376 | { |
cd80958d DG |
377 | struct lttcomm_session_msg lsm; |
378 | ||
379 | lsm.cmd_type = LTTNG_STOP_TRACE; | |
380 | copy_string(lsm.session.name, handle->session_name, | |
381 | sizeof(lsm.session.name)); | |
382 | ||
383 | return ask_sessiond(&lsm, NULL); | |
f3ed775e DG |
384 | } |
385 | ||
386 | /* | |
cd80958d | 387 | * Add context to event or/and channel. |
1df4dedd | 388 | */ |
cd80958d | 389 | int lttng_add_context(struct lttng_handle *handle, |
38057ed1 DG |
390 | struct lttng_event_context *ctx, const char *event_name, |
391 | const char *channel_name) | |
d65106b1 | 392 | { |
cd80958d DG |
393 | struct lttcomm_session_msg lsm; |
394 | ||
395 | if (!handle) { | |
396 | return -1; | |
397 | } | |
398 | ||
399 | lsm.cmd_type = LTTNG_ADD_CONTEXT; | |
400 | ||
401 | /* Copy channel name */ | |
402 | copy_string(lsm.u.context.channel_name, channel_name, | |
403 | sizeof(lsm.u.context.channel_name)); | |
404 | /* Copy event name */ | |
405 | copy_string(lsm.u.context.event_name, event_name, | |
406 | sizeof(lsm.u.context.event_name)); | |
407 | ||
408 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
d65106b1 | 409 | |
eb354453 DG |
410 | if (ctx) { |
411 | memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); | |
d65106b1 DG |
412 | } |
413 | ||
cd80958d DG |
414 | copy_string(lsm.session.name, handle->session_name, |
415 | sizeof(lsm.session.name)); | |
416 | ||
417 | return ask_sessiond(&lsm, NULL); | |
d65106b1 DG |
418 | } |
419 | ||
f3ed775e | 420 | /* |
cd80958d | 421 | * Enable event |
f3ed775e | 422 | */ |
cd80958d | 423 | int lttng_enable_event(struct lttng_handle *handle, |
38057ed1 | 424 | struct lttng_event *ev, const char *channel_name) |
1df4dedd | 425 | { |
cd80958d DG |
426 | struct lttcomm_session_msg lsm; |
427 | ||
428 | if (!handle) { | |
429 | return -1; | |
430 | } | |
33a2b854 | 431 | |
94cf3c47 | 432 | if (channel_name == NULL) { |
cd80958d DG |
433 | copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME, |
434 | sizeof(lsm.u.enable.channel_name)); | |
33a2b854 | 435 | } else { |
cd80958d DG |
436 | copy_string(lsm.u.enable.channel_name, channel_name, |
437 | sizeof(lsm.u.enable.channel_name)); | |
eb354453 DG |
438 | } |
439 | ||
cd80958d | 440 | copy_lttng_domain(&lsm.domain, &handle->domain); |
0d0c377a | 441 | |
cd80958d DG |
442 | if (ev) { |
443 | lsm.cmd_type = LTTNG_ENABLE_EVENT; | |
444 | memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event)); | |
0d0c377a | 445 | } else { |
cd80958d | 446 | lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT; |
f3ed775e DG |
447 | } |
448 | ||
cd80958d DG |
449 | copy_string(lsm.session.name, handle->session_name, |
450 | sizeof(lsm.session.name)); | |
451 | ||
452 | return ask_sessiond(&lsm, NULL); | |
1df4dedd DG |
453 | } |
454 | ||
455 | /* | |
f5177a38 | 456 | * Disable event of a channel and domain. |
1df4dedd | 457 | */ |
cd80958d | 458 | int lttng_disable_event(struct lttng_handle *handle, const char *name, |
38057ed1 | 459 | const char *channel_name) |
1df4dedd | 460 | { |
cd80958d | 461 | struct lttcomm_session_msg lsm; |
1df4dedd | 462 | |
cd80958d DG |
463 | if (!handle) { |
464 | return -1; | |
465 | } | |
466 | ||
467 | if (channel_name) { | |
468 | copy_string(lsm.u.disable.channel_name, channel_name, | |
469 | sizeof(lsm.u.disable.channel_name)); | |
f3ed775e | 470 | } else { |
cd80958d DG |
471 | copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME, |
472 | sizeof(lsm.u.disable.channel_name)); | |
eb354453 DG |
473 | } |
474 | ||
cd80958d | 475 | copy_lttng_domain(&lsm.domain, &handle->domain); |
f5177a38 DG |
476 | |
477 | if (name == NULL) { | |
cd80958d DG |
478 | copy_string(lsm.u.disable.name, name, sizeof(lsm.u.disable.name)); |
479 | lsm.cmd_type = LTTNG_DISABLE_EVENT; | |
f5177a38 | 480 | } else { |
cd80958d | 481 | lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT; |
f3ed775e DG |
482 | } |
483 | ||
cd80958d DG |
484 | copy_string(lsm.session.name, handle->session_name, |
485 | sizeof(lsm.session.name)); | |
486 | ||
487 | return ask_sessiond(&lsm, NULL); | |
1df4dedd DG |
488 | } |
489 | ||
490 | /* | |
0d0c377a | 491 | * Enable channel per domain |
a5c5a2bd | 492 | */ |
cd80958d | 493 | int lttng_enable_channel(struct lttng_handle *handle, |
38057ed1 | 494 | struct lttng_channel *chan) |
a5c5a2bd | 495 | { |
cd80958d DG |
496 | struct lttcomm_session_msg lsm; |
497 | ||
498 | if (!handle) { | |
499 | return -1; | |
500 | } | |
501 | ||
eb354453 | 502 | if (chan) { |
cd80958d | 503 | memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan)); |
eb354453 | 504 | } |
7d29a247 | 505 | |
cd80958d DG |
506 | lsm.cmd_type = LTTNG_ENABLE_CHANNEL; |
507 | ||
508 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
7d29a247 | 509 | |
cd80958d DG |
510 | copy_string(lsm.session.name, handle->session_name, |
511 | sizeof(lsm.session.name)); | |
512 | ||
513 | return ask_sessiond(&lsm, NULL); | |
8c0faa1d | 514 | } |
1df4dedd | 515 | |
2ef84c95 | 516 | /* |
0b97ec54 | 517 | * All tracing will be stopped for registered events of the channel. |
2ef84c95 | 518 | */ |
cd80958d | 519 | int lttng_disable_channel(struct lttng_handle *handle, const char *name) |
2ef84c95 | 520 | { |
cd80958d DG |
521 | struct lttcomm_session_msg lsm; |
522 | ||
523 | if (!handle) { | |
524 | return -1; | |
525 | } | |
526 | ||
527 | if (name) { | |
528 | copy_string(lsm.u.disable.channel_name, name, | |
529 | sizeof(lsm.u.disable.channel_name)); | |
530 | } | |
531 | ||
532 | lsm.cmd_type = LTTNG_DISABLE_CHANNEL; | |
1df4dedd | 533 | |
cd80958d DG |
534 | copy_lttng_domain(&lsm.domain, &handle->domain); |
535 | ||
536 | copy_string(lsm.session.name, handle->session_name, | |
537 | sizeof(lsm.session.name)); | |
538 | ||
539 | return ask_sessiond(&lsm, NULL); | |
ca95a216 DG |
540 | } |
541 | ||
fac6795d | 542 | /* |
2a71efd5 | 543 | * List all available tracepoints of domain. |
fac6795d | 544 | * |
2a71efd5 | 545 | * Return the size (bytes) of the list and set the events array. |
7d29a247 | 546 | * On error, return negative value. |
fac6795d | 547 | */ |
cd80958d | 548 | int lttng_list_tracepoints(struct lttng_handle *handle, |
2a71efd5 | 549 | struct lttng_event **events) |
fac6795d | 550 | { |
052da939 | 551 | int ret; |
cd80958d DG |
552 | struct lttcomm_session_msg lsm; |
553 | ||
554 | if (!handle) { | |
555 | return -1; | |
556 | } | |
fac6795d | 557 | |
cd80958d DG |
558 | lsm.cmd_type = LTTNG_LIST_TRACEPOINTS; |
559 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
2a71efd5 | 560 | |
cd80958d | 561 | ret = ask_sessiond(&lsm, (void **) events); |
052da939 DG |
562 | if (ret < 0) { |
563 | return ret; | |
eb354453 | 564 | } |
fac6795d | 565 | |
9f19cc17 | 566 | return ret / sizeof(struct lttng_event); |
fac6795d DG |
567 | } |
568 | ||
1657e9bb | 569 | /* |
7d29a247 | 570 | * Return a human readable string of code |
1657e9bb | 571 | */ |
7d29a247 | 572 | const char *lttng_get_readable_code(int code) |
1657e9bb | 573 | { |
7d29a247 DG |
574 | if (code > -LTTCOMM_OK) { |
575 | return "Ended with errors"; | |
1657e9bb DG |
576 | } |
577 | ||
7d29a247 | 578 | return lttcomm_get_readable_code(code); |
1657e9bb DG |
579 | } |
580 | ||
aaf97519 | 581 | /* |
894be886 | 582 | * Create a brand new session using name. |
aaf97519 | 583 | */ |
38057ed1 | 584 | int lttng_create_session(const char *name, const char *path) |
aaf97519 | 585 | { |
cd80958d DG |
586 | struct lttcomm_session_msg lsm; |
587 | ||
588 | lsm.cmd_type = LTTNG_CREATE_SESSION; | |
589 | copy_string(lsm.session.name, name, sizeof(lsm.session.name)); | |
590 | copy_string(lsm.session.path, path, sizeof(lsm.session.path)); | |
591 | ||
592 | return ask_sessiond(&lsm, NULL); | |
8028d920 DG |
593 | } |
594 | ||
595 | /* | |
8028d920 DG |
596 | * Destroy session using name. |
597 | */ | |
cd80958d | 598 | int lttng_destroy_session(struct lttng_handle *handle) |
8028d920 | 599 | { |
cd80958d DG |
600 | struct lttcomm_session_msg lsm; |
601 | ||
602 | if (!handle) { | |
603 | return -1; | |
604 | } | |
605 | ||
606 | lsm.cmd_type = LTTNG_DESTROY_SESSION; | |
607 | copy_string(lsm.session.name, handle->session_name, | |
608 | sizeof(lsm.session.name)); | |
609 | ||
610 | return ask_sessiond(&lsm, NULL); | |
aaf97519 DG |
611 | } |
612 | ||
57167058 | 613 | /* |
57167058 DG |
614 | * Ask the session daemon for all available sessions. |
615 | * | |
ca95a216 DG |
616 | * Return number of session. |
617 | * On error, return negative value. | |
57167058 | 618 | */ |
ca95a216 | 619 | int lttng_list_sessions(struct lttng_session **sessions) |
57167058 | 620 | { |
ca95a216 | 621 | int ret; |
cd80958d | 622 | struct lttcomm_session_msg lsm; |
57167058 | 623 | |
cd80958d DG |
624 | lsm.cmd_type = LTTNG_LIST_SESSIONS; |
625 | ret = ask_sessiond(&lsm, (void**) sessions); | |
57167058 | 626 | if (ret < 0) { |
ca95a216 | 627 | return ret; |
57167058 DG |
628 | } |
629 | ||
ca95a216 | 630 | return ret / sizeof(struct lttng_session); |
57167058 DG |
631 | } |
632 | ||
9f19cc17 DG |
633 | /* |
634 | * List domain of a session. | |
635 | */ | |
cd80958d DG |
636 | int lttng_list_domains(struct lttng_handle *handle, |
637 | struct lttng_domain **domains) | |
9f19cc17 DG |
638 | { |
639 | int ret; | |
cd80958d DG |
640 | struct lttcomm_session_msg lsm; |
641 | ||
642 | if (!handle) { | |
643 | return -1; | |
644 | } | |
9f19cc17 | 645 | |
cd80958d DG |
646 | lsm.cmd_type = LTTNG_LIST_DOMAINS; |
647 | ||
648 | copy_string(lsm.session.name, handle->session_name, | |
649 | sizeof(lsm.session.name)); | |
650 | ||
651 | ret = ask_sessiond(&lsm, (void**) domains); | |
9f19cc17 DG |
652 | if (ret < 0) { |
653 | return ret; | |
654 | } | |
655 | ||
656 | return ret / sizeof(struct lttng_domain); | |
657 | } | |
658 | ||
659 | /* | |
660 | * List channels of a session | |
661 | */ | |
cd80958d DG |
662 | int lttng_list_channels(struct lttng_handle *handle, |
663 | struct lttng_channel **channels) | |
9f19cc17 DG |
664 | { |
665 | int ret; | |
cd80958d DG |
666 | struct lttcomm_session_msg lsm; |
667 | ||
668 | if (!handle) { | |
669 | return -1; | |
670 | } | |
671 | ||
672 | lsm.cmd_type = LTTNG_LIST_CHANNELS; | |
673 | copy_string(lsm.session.name, handle->session_name, | |
674 | sizeof(lsm.session.name)); | |
9f19cc17 | 675 | |
cd80958d | 676 | copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 677 | |
cd80958d | 678 | ret = ask_sessiond(&lsm, (void**) channels); |
9f19cc17 DG |
679 | if (ret < 0) { |
680 | return ret; | |
681 | } | |
682 | ||
683 | return ret / sizeof(struct lttng_channel); | |
684 | } | |
685 | ||
686 | /* | |
687 | * List events of a session channel. | |
688 | */ | |
cd80958d DG |
689 | int lttng_list_events(struct lttng_handle *handle, |
690 | const char *channel_name, struct lttng_event **events) | |
9f19cc17 DG |
691 | { |
692 | int ret; | |
cd80958d | 693 | struct lttcomm_session_msg lsm; |
9f19cc17 | 694 | |
cd80958d DG |
695 | if (!handle) { |
696 | return -1; | |
697 | } | |
698 | ||
699 | lsm.cmd_type = LTTNG_LIST_EVENTS; | |
700 | copy_string(lsm.session.name, handle->session_name, | |
701 | sizeof(lsm.session.name)); | |
702 | copy_string(lsm.u.list.channel_name, channel_name, | |
703 | sizeof(lsm.u.list.channel_name)); | |
704 | ||
705 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
9f19cc17 | 706 | |
cd80958d | 707 | ret = ask_sessiond(&lsm, (void**) events); |
9f19cc17 DG |
708 | if (ret < 0) { |
709 | return ret; | |
710 | } | |
711 | ||
712 | return ret / sizeof(struct lttng_event); | |
713 | } | |
714 | ||
fac6795d DG |
715 | /* |
716 | * lttng_set_tracing_group | |
717 | * | |
718 | * Set tracing group variable with name. This function | |
719 | * allocate memory pointed by tracing_group. | |
720 | */ | |
721 | int lttng_set_tracing_group(const char *name) | |
722 | { | |
723 | if (asprintf(&tracing_group, "%s", name) < 0) { | |
724 | return -ENOMEM; | |
725 | } | |
726 | ||
727 | return 0; | |
728 | } | |
729 | ||
d0254c7c MD |
730 | /* |
731 | * lttng_calibrate | |
732 | */ | |
cd80958d | 733 | int lttng_calibrate(struct lttng_handle *handle, |
d0254c7c MD |
734 | struct lttng_calibrate *calibrate) |
735 | { | |
cd80958d | 736 | struct lttcomm_session_msg lsm; |
d0254c7c | 737 | |
cd80958d DG |
738 | if (!handle) { |
739 | return -1; | |
740 | } | |
d0254c7c | 741 | |
cd80958d DG |
742 | lsm.cmd_type = LTTNG_CALIBRATE; |
743 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
d0254c7c | 744 | |
cd80958d DG |
745 | memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate)); |
746 | ||
747 | return ask_sessiond(&lsm, NULL); | |
d0254c7c MD |
748 | } |
749 | ||
fac6795d DG |
750 | /* |
751 | * lttng_check_session_daemon | |
752 | * | |
947308c4 DG |
753 | * Yes, return 1 |
754 | * No, return 0 | |
755 | * Error, return negative value | |
fac6795d | 756 | */ |
947308c4 | 757 | int lttng_session_daemon_alive(void) |
fac6795d DG |
758 | { |
759 | int ret; | |
760 | ||
761 | ret = set_session_daemon_path(); | |
762 | if (ret < 0) { | |
947308c4 | 763 | /* Error */ |
fac6795d DG |
764 | return ret; |
765 | } | |
766 | ||
7d8234d9 | 767 | /* If socket exist, we check if the daemon listens to connect. */ |
fac6795d DG |
768 | ret = access(sessiond_sock_path, F_OK); |
769 | if (ret < 0) { | |
947308c4 DG |
770 | /* Not alive */ |
771 | return 0; | |
fac6795d DG |
772 | } |
773 | ||
7d8234d9 MD |
774 | ret = lttcomm_connect_unix_sock(sessiond_sock_path); |
775 | if (ret < 0) { | |
776 | /* Not alive */ | |
777 | return 0; | |
778 | } | |
779 | ret = lttcomm_close_unix_sock(ret); | |
780 | if (ret < 0) | |
781 | perror("lttcomm_close_unix_sock"); | |
782 | ||
947308c4 DG |
783 | /* Is alive */ |
784 | return 1; | |
fac6795d DG |
785 | } |
786 | ||
787 | /* | |
788 | * lib constructor | |
789 | */ | |
790 | static void __attribute__((constructor)) init() | |
791 | { | |
792 | /* Set default session group */ | |
64a23ac4 | 793 | lttng_set_tracing_group(LTTNG_DEFAULT_TRACING_GROUP); |
fac6795d | 794 | } |