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 | |
fac6795d | 24 | #include <grp.h> |
1e307fab | 25 | #include <errno.h> |
fac6795d DG |
26 | #include <stdio.h> |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <unistd.h> | |
30 | ||
990570ed DG |
31 | #include <common/common.h> |
32 | #include <common/defaults.h> | |
db758600 | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 34 | #include <lttng/lttng.h> |
fac6795d DG |
35 | |
36 | /* Socket to session daemon for communication */ | |
37 | static int sessiond_socket; | |
38 | static char sessiond_sock_path[PATH_MAX]; | |
39 | ||
fac6795d DG |
40 | /* Variables */ |
41 | static char *tracing_group; | |
42 | static int connected; | |
43 | ||
99497cd0 MD |
44 | /* |
45 | * Copy string from src to dst and enforce null terminated byte. | |
46 | */ | |
47 | static void copy_string(char *dst, const char *src, size_t len) | |
48 | { | |
e7d6716d | 49 | if (src && dst) { |
99497cd0 MD |
50 | strncpy(dst, src, len); |
51 | /* Enforce the NULL terminated byte */ | |
52 | dst[len - 1] = '\0'; | |
cd80958d DG |
53 | } else if (dst) { |
54 | dst[0] = '\0'; | |
99497cd0 MD |
55 | } |
56 | } | |
57 | ||
fac6795d | 58 | /* |
cd80958d | 59 | * Copy domain to lttcomm_session_msg domain. |
fac6795d | 60 | * |
cd80958d DG |
61 | * If domain is unknown, default domain will be the kernel. |
62 | */ | |
63 | static void copy_lttng_domain(struct lttng_domain *dst, struct lttng_domain *src) | |
64 | { | |
65 | if (src && dst) { | |
66 | switch (src->type) { | |
67 | case LTTNG_DOMAIN_KERNEL: | |
68 | case LTTNG_DOMAIN_UST: | |
d78d6610 | 69 | /* |
cd80958d DG |
70 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
71 | case LTTNG_DOMAIN_UST_PID: | |
72 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 73 | */ |
cd80958d DG |
74 | memcpy(dst, src, sizeof(struct lttng_domain)); |
75 | break; | |
76 | default: | |
441c16a7 | 77 | memset(dst, 0, sizeof(struct lttng_domain)); |
cd80958d DG |
78 | dst->type = LTTNG_DOMAIN_KERNEL; |
79 | break; | |
80 | } | |
81 | } | |
82 | } | |
83 | ||
84 | /* | |
85 | * Send lttcomm_session_msg to the session daemon. | |
fac6795d | 86 | * |
1c8d13c8 TD |
87 | * On success, returns the number of bytes sent (>=0) |
88 | * On error, returns -1 | |
fac6795d | 89 | */ |
cd80958d | 90 | static int send_session_msg(struct lttcomm_session_msg *lsm) |
fac6795d DG |
91 | { |
92 | int ret; | |
93 | ||
94 | if (!connected) { | |
e065084a DG |
95 | ret = -ENOTCONN; |
96 | goto end; | |
fac6795d DG |
97 | } |
98 | ||
be040666 | 99 | ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm, |
cd80958d | 100 | sizeof(struct lttcomm_session_msg)); |
e065084a DG |
101 | |
102 | end: | |
103 | return ret; | |
104 | } | |
105 | ||
106 | /* | |
cd80958d | 107 | * Receive data from the sessiond socket. |
e065084a | 108 | * |
1c8d13c8 TD |
109 | * On success, returns the number of bytes received (>=0) |
110 | * On error, returns -1 (recvmsg() error) or -ENOTCONN | |
e065084a | 111 | */ |
ca95a216 | 112 | static int recv_data_sessiond(void *buf, size_t len) |
e065084a DG |
113 | { |
114 | int ret; | |
115 | ||
116 | if (!connected) { | |
117 | ret = -ENOTCONN; | |
118 | goto end; | |
fac6795d DG |
119 | } |
120 | ||
ca95a216 | 121 | ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len); |
fac6795d | 122 | |
e065084a | 123 | end: |
fac6795d DG |
124 | return ret; |
125 | } | |
126 | ||
127 | /* | |
1c8d13c8 | 128 | * Check if we are in the specified group. |
65beb5ff | 129 | * |
2269e89e | 130 | * If yes return 1, else return -1. |
947308c4 DG |
131 | */ |
132 | static int check_tracing_group(const char *grp_name) | |
133 | { | |
134 | struct group *grp_tracing; /* no free(). See getgrnam(3) */ | |
135 | gid_t *grp_list; | |
136 | int grp_list_size, grp_id, i; | |
137 | int ret = -1; | |
138 | ||
139 | /* Get GID of group 'tracing' */ | |
140 | grp_tracing = getgrnam(grp_name); | |
e66c1d2c MD |
141 | if (!grp_tracing) { |
142 | /* If grp_tracing is NULL, the group does not exist. */ | |
947308c4 DG |
143 | goto end; |
144 | } | |
145 | ||
146 | /* Get number of supplementary group IDs */ | |
147 | grp_list_size = getgroups(0, NULL); | |
148 | if (grp_list_size < 0) { | |
149 | perror("getgroups"); | |
150 | goto end; | |
151 | } | |
152 | ||
153 | /* Alloc group list of the right size */ | |
154 | grp_list = malloc(grp_list_size * sizeof(gid_t)); | |
00795392 | 155 | if (!grp_list) { |
1c8d13c8 | 156 | perror("malloc"); |
00795392 MD |
157 | goto end; |
158 | } | |
947308c4 | 159 | grp_id = getgroups(grp_list_size, grp_list); |
1c8d13c8 | 160 | if (grp_id < 0) { |
947308c4 DG |
161 | perror("getgroups"); |
162 | goto free_list; | |
163 | } | |
164 | ||
165 | for (i = 0; i < grp_list_size; i++) { | |
166 | if (grp_list[i] == grp_tracing->gr_gid) { | |
2269e89e | 167 | ret = 1; |
947308c4 DG |
168 | break; |
169 | } | |
170 | } | |
171 | ||
172 | free_list: | |
173 | free(grp_list); | |
174 | ||
175 | end: | |
176 | return ret; | |
177 | } | |
178 | ||
179 | /* | |
2269e89e DG |
180 | * Try connect to session daemon with sock_path. |
181 | * | |
182 | * Return 0 on success, else -1 | |
183 | */ | |
184 | static int try_connect_sessiond(const char *sock_path) | |
185 | { | |
186 | int ret; | |
187 | ||
188 | /* If socket exist, we check if the daemon listens for connect. */ | |
189 | ret = access(sock_path, F_OK); | |
190 | if (ret < 0) { | |
191 | /* Not alive */ | |
192 | return -1; | |
193 | } | |
194 | ||
195 | ret = lttcomm_connect_unix_sock(sock_path); | |
196 | if (ret < 0) { | |
197 | /* Not alive */ | |
198 | return -1; | |
199 | } | |
200 | ||
201 | ret = lttcomm_close_unix_sock(ret); | |
202 | if (ret < 0) { | |
203 | perror("lttcomm_close_unix_sock"); | |
204 | } | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | /* | |
1c8d13c8 TD |
210 | * Set sessiond socket path by putting it in the global |
211 | * sessiond_sock_path variable. | |
212 | * Returns 0 on success, | |
213 | * -ENOMEM on failure (the sessiond socket path is somehow too long) | |
947308c4 DG |
214 | */ |
215 | static int set_session_daemon_path(void) | |
216 | { | |
217 | int ret; | |
2269e89e DG |
218 | int in_tgroup = 0; /* In tracing group */ |
219 | uid_t uid; | |
220 | ||
221 | uid = getuid(); | |
947308c4 | 222 | |
2269e89e DG |
223 | if (uid != 0) { |
224 | /* Are we in the tracing group ? */ | |
225 | in_tgroup = check_tracing_group(tracing_group); | |
226 | } | |
227 | ||
08a9c49f TD |
228 | if ((uid == 0) || in_tgroup) { |
229 | copy_string(sessiond_sock_path, DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, | |
2269e89e | 230 | sizeof(sessiond_sock_path)); |
08a9c49f | 231 | } |
2269e89e | 232 | |
08a9c49f TD |
233 | if (uid != 0) { |
234 | if (in_tgroup) { | |
235 | /* Tracing group */ | |
236 | ret = try_connect_sessiond(sessiond_sock_path); | |
237 | if (ret >= 0) { | |
238 | goto end; | |
2269e89e | 239 | } |
08a9c49f | 240 | /* Global session daemon not available... */ |
2269e89e | 241 | } |
08a9c49f TD |
242 | /* ...or not in tracing group (and not root), default */ |
243 | ||
244 | /* | |
245 | * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small; | |
246 | * With GNU C >= 2.1, snprintf returns the required size (excluding closing null) | |
247 | */ | |
248 | ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path), | |
249 | DEFAULT_HOME_CLIENT_UNIX_SOCK, getenv("HOME")); | |
250 | if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) { | |
947308c4 DG |
251 | return -ENOMEM; |
252 | } | |
947308c4 | 253 | } |
08a9c49f | 254 | end: |
947308c4 DG |
255 | return 0; |
256 | } | |
257 | ||
65beb5ff DG |
258 | /* |
259 | * Connect to the LTTng session daemon. | |
260 | * | |
261 | * On success, return 0. On error, return -1. | |
262 | */ | |
263 | static int connect_sessiond(void) | |
264 | { | |
265 | int ret; | |
266 | ||
267 | ret = set_session_daemon_path(); | |
268 | if (ret < 0) { | |
1c8d13c8 | 269 | return -1; /* set_session_daemon_path() returns -ENOMEM */ |
65beb5ff DG |
270 | } |
271 | ||
272 | /* Connect to the sesssion daemon */ | |
273 | ret = lttcomm_connect_unix_sock(sessiond_sock_path); | |
274 | if (ret < 0) { | |
275 | return ret; | |
276 | } | |
277 | ||
278 | sessiond_socket = ret; | |
279 | connected = 1; | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | /* | |
1c8d13c8 TD |
285 | * Clean disconnect from the session daemon. |
286 | * On success, return 0. On error, return -1. | |
65beb5ff DG |
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 | * |
af87c45a | 304 | * Return size of data (only payload, not header) or a negative error code. |
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) { | |
874d3f84 | 338 | /* If client free with size 0 */ |
a45d5536 DG |
339 | if (buf != NULL) { |
340 | *buf = NULL; | |
341 | } | |
7d29a247 | 342 | ret = 0; |
65beb5ff DG |
343 | goto end; |
344 | } | |
345 | ||
346 | data = (void*) malloc(size); | |
347 | ||
348 | /* Get payload data */ | |
349 | ret = recv_data_sessiond(data, size); | |
350 | if (ret < 0) { | |
351 | free(data); | |
352 | goto end; | |
353 | } | |
354 | ||
83009e5e DG |
355 | /* |
356 | * Extra protection not to dereference a NULL pointer. If buf is NULL at | |
357 | * this point, an error is returned and data is freed. | |
358 | */ | |
359 | if (buf == NULL) { | |
360 | ret = -1; | |
361 | free(data); | |
362 | goto end; | |
363 | } | |
364 | ||
65beb5ff DG |
365 | *buf = data; |
366 | ret = size; | |
367 | ||
368 | end: | |
369 | disconnect_sessiond(); | |
370 | return ret; | |
371 | } | |
372 | ||
9f19cc17 | 373 | /* |
cd80958d | 374 | * Create lttng handle and return pointer. |
1c8d13c8 | 375 | * The returned pointer will be NULL in case of malloc() error. |
9f19cc17 | 376 | */ |
cd80958d DG |
377 | struct lttng_handle *lttng_create_handle(const char *session_name, |
378 | struct lttng_domain *domain) | |
9f19cc17 | 379 | { |
cd80958d DG |
380 | struct lttng_handle *handle; |
381 | ||
382 | handle = malloc(sizeof(struct lttng_handle)); | |
383 | if (handle == NULL) { | |
384 | perror("malloc handle"); | |
385 | goto end; | |
386 | } | |
387 | ||
388 | /* Copy session name */ | |
389 | copy_string(handle->session_name, session_name, | |
390 | sizeof(handle->session_name)); | |
391 | ||
392 | /* Copy lttng domain */ | |
393 | copy_lttng_domain(&handle->domain, domain); | |
394 | ||
395 | end: | |
396 | return handle; | |
397 | } | |
398 | ||
399 | /* | |
400 | * Destroy handle by free(3) the pointer. | |
401 | */ | |
402 | void lttng_destroy_handle(struct lttng_handle *handle) | |
403 | { | |
404 | if (handle) { | |
405 | free(handle); | |
eb354453 DG |
406 | } |
407 | } | |
408 | ||
d9800920 DG |
409 | /* |
410 | * Register an outside consumer. | |
1c8d13c8 | 411 | * Returns size of returned session payload data or a negative error code. |
d9800920 DG |
412 | */ |
413 | int lttng_register_consumer(struct lttng_handle *handle, | |
414 | const char *socket_path) | |
415 | { | |
416 | struct lttcomm_session_msg lsm; | |
417 | ||
418 | lsm.cmd_type = LTTNG_REGISTER_CONSUMER; | |
419 | copy_string(lsm.session.name, handle->session_name, | |
420 | sizeof(lsm.session.name)); | |
421 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
422 | ||
423 | copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path)); | |
424 | ||
425 | return ask_sessiond(&lsm, NULL); | |
426 | } | |
427 | ||
1df4dedd | 428 | /* |
1c8d13c8 TD |
429 | * Start tracing for all traces of the session. |
430 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 431 | */ |
6a4f824d | 432 | int lttng_start_tracing(const char *session_name) |
f3ed775e | 433 | { |
cd80958d DG |
434 | struct lttcomm_session_msg lsm; |
435 | ||
6a4f824d | 436 | if (session_name == NULL) { |
cd80958d DG |
437 | return -1; |
438 | } | |
439 | ||
440 | lsm.cmd_type = LTTNG_START_TRACE; | |
6a4f824d DG |
441 | |
442 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); | |
cd80958d DG |
443 | |
444 | return ask_sessiond(&lsm, NULL); | |
f3ed775e | 445 | } |
1df4dedd DG |
446 | |
447 | /* | |
1c8d13c8 TD |
448 | * Stop tracing for all traces of the session. |
449 | * Returns size of returned session payload data or a negative error code. | |
f3ed775e | 450 | */ |
6a4f824d | 451 | int lttng_stop_tracing(const char *session_name) |
f3ed775e | 452 | { |
cd80958d DG |
453 | struct lttcomm_session_msg lsm; |
454 | ||
6a4f824d DG |
455 | if (session_name == NULL) { |
456 | return -1; | |
457 | } | |
458 | ||
cd80958d | 459 | lsm.cmd_type = LTTNG_STOP_TRACE; |
6a4f824d DG |
460 | |
461 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); | |
cd80958d DG |
462 | |
463 | return ask_sessiond(&lsm, NULL); | |
f3ed775e DG |
464 | } |
465 | ||
466 | /* | |
1e46a50f TD |
467 | * Add context to event and/or channel. |
468 | * If event_name is NULL, the context is applied to all events of the channel. | |
469 | * If channel_name is NULL, a lookup of the event's channel is done. | |
470 | * If both are NULL, the context is applied to all events of all channels. | |
af87c45a DG |
471 | * |
472 | * Returns the size of the returned payload data or a negative error code. | |
1df4dedd | 473 | */ |
cd80958d | 474 | int lttng_add_context(struct lttng_handle *handle, |
38057ed1 DG |
475 | struct lttng_event_context *ctx, const char *event_name, |
476 | const char *channel_name) | |
d65106b1 | 477 | { |
cd80958d DG |
478 | struct lttcomm_session_msg lsm; |
479 | ||
9d697d3d DG |
480 | /* Safety check. Both are mandatory */ |
481 | if (handle == NULL || ctx == NULL) { | |
cd80958d DG |
482 | return -1; |
483 | } | |
484 | ||
441c16a7 MD |
485 | memset(&lsm, 0, sizeof(lsm)); |
486 | ||
cd80958d DG |
487 | lsm.cmd_type = LTTNG_ADD_CONTEXT; |
488 | ||
489 | /* Copy channel name */ | |
490 | copy_string(lsm.u.context.channel_name, channel_name, | |
491 | sizeof(lsm.u.context.channel_name)); | |
492 | /* Copy event name */ | |
493 | copy_string(lsm.u.context.event_name, event_name, | |
494 | sizeof(lsm.u.context.event_name)); | |
495 | ||
496 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
d65106b1 | 497 | |
9d697d3d | 498 | memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); |
d65106b1 | 499 | |
cd80958d DG |
500 | copy_string(lsm.session.name, handle->session_name, |
501 | sizeof(lsm.session.name)); | |
502 | ||
503 | return ask_sessiond(&lsm, NULL); | |
d65106b1 DG |
504 | } |
505 | ||
f3ed775e | 506 | /* |
1c8d13c8 TD |
507 | * Enable event(s) for a channel. |
508 | * If no event name is specified, all events are enabled. | |
509 | * If no channel name is specified, the default 'channel0' is used. | |
510 | * Returns size of returned session payload data or a negative error code. | |
f3ed775e | 511 | */ |
cd80958d | 512 | int lttng_enable_event(struct lttng_handle *handle, |
38057ed1 | 513 | struct lttng_event *ev, const char *channel_name) |
1df4dedd | 514 | { |
cd80958d DG |
515 | struct lttcomm_session_msg lsm; |
516 | ||
5117eeec | 517 | if (handle == NULL || ev == NULL) { |
cd80958d DG |
518 | return -1; |
519 | } | |
33a2b854 | 520 | |
441c16a7 MD |
521 | memset(&lsm, 0, sizeof(lsm)); |
522 | ||
5117eeec | 523 | /* If no channel name, we put the default name */ |
94cf3c47 | 524 | if (channel_name == NULL) { |
cd80958d DG |
525 | copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME, |
526 | sizeof(lsm.u.enable.channel_name)); | |
33a2b854 | 527 | } else { |
cd80958d DG |
528 | copy_string(lsm.u.enable.channel_name, channel_name, |
529 | sizeof(lsm.u.enable.channel_name)); | |
eb354453 DG |
530 | } |
531 | ||
cd80958d | 532 | copy_lttng_domain(&lsm.domain, &handle->domain); |
0d0c377a | 533 | |
8c9ae521 | 534 | if (ev->name[0] != '\0') { |
cd80958d | 535 | lsm.cmd_type = LTTNG_ENABLE_EVENT; |
0d0c377a | 536 | } else { |
cd80958d | 537 | lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT; |
f3ed775e | 538 | } |
8c9ae521 | 539 | memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event)); |
f3ed775e | 540 | |
cd80958d DG |
541 | copy_string(lsm.session.name, handle->session_name, |
542 | sizeof(lsm.session.name)); | |
543 | ||
544 | return ask_sessiond(&lsm, NULL); | |
1df4dedd DG |
545 | } |
546 | ||
547 | /* | |
1c8d13c8 TD |
548 | * Disable event(s) of a channel and domain. |
549 | * If no event name is specified, all events are disabled. | |
550 | * If no channel name is specified, the default 'channel0' is used. | |
551 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 552 | */ |
cd80958d | 553 | int lttng_disable_event(struct lttng_handle *handle, const char *name, |
38057ed1 | 554 | const char *channel_name) |
1df4dedd | 555 | { |
cd80958d | 556 | struct lttcomm_session_msg lsm; |
1df4dedd | 557 | |
9d697d3d | 558 | if (handle == NULL) { |
cd80958d DG |
559 | return -1; |
560 | } | |
561 | ||
441c16a7 MD |
562 | memset(&lsm, 0, sizeof(lsm)); |
563 | ||
cd80958d DG |
564 | if (channel_name) { |
565 | copy_string(lsm.u.disable.channel_name, channel_name, | |
566 | sizeof(lsm.u.disable.channel_name)); | |
f3ed775e | 567 | } else { |
cd80958d DG |
568 | copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME, |
569 | sizeof(lsm.u.disable.channel_name)); | |
eb354453 DG |
570 | } |
571 | ||
cd80958d | 572 | copy_lttng_domain(&lsm.domain, &handle->domain); |
f5177a38 | 573 | |
f84efadf | 574 | if (name != NULL) { |
cd80958d DG |
575 | copy_string(lsm.u.disable.name, name, sizeof(lsm.u.disable.name)); |
576 | lsm.cmd_type = LTTNG_DISABLE_EVENT; | |
f5177a38 | 577 | } else { |
cd80958d | 578 | lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT; |
f3ed775e DG |
579 | } |
580 | ||
cd80958d DG |
581 | copy_string(lsm.session.name, handle->session_name, |
582 | sizeof(lsm.session.name)); | |
583 | ||
584 | return ask_sessiond(&lsm, NULL); | |
1df4dedd DG |
585 | } |
586 | ||
587 | /* | |
1c8d13c8 TD |
588 | * Enable channel per domain |
589 | * Returns size of returned session payload data or a negative error code. | |
a5c5a2bd | 590 | */ |
cd80958d | 591 | int lttng_enable_channel(struct lttng_handle *handle, |
38057ed1 | 592 | struct lttng_channel *chan) |
a5c5a2bd | 593 | { |
cd80958d DG |
594 | struct lttcomm_session_msg lsm; |
595 | ||
5117eeec DG |
596 | /* |
597 | * NULL arguments are forbidden. No default values. | |
598 | */ | |
599 | if (handle == NULL || chan == NULL) { | |
cd80958d DG |
600 | return -1; |
601 | } | |
602 | ||
441c16a7 MD |
603 | memset(&lsm, 0, sizeof(lsm)); |
604 | ||
5117eeec | 605 | memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan)); |
7d29a247 | 606 | |
cd80958d DG |
607 | lsm.cmd_type = LTTNG_ENABLE_CHANNEL; |
608 | ||
609 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
7d29a247 | 610 | |
cd80958d DG |
611 | copy_string(lsm.session.name, handle->session_name, |
612 | sizeof(lsm.session.name)); | |
613 | ||
614 | return ask_sessiond(&lsm, NULL); | |
8c0faa1d | 615 | } |
1df4dedd | 616 | |
2ef84c95 | 617 | /* |
1c8d13c8 TD |
618 | * All tracing will be stopped for registered events of the channel. |
619 | * Returns size of returned session payload data or a negative error code. | |
2ef84c95 | 620 | */ |
cd80958d | 621 | int lttng_disable_channel(struct lttng_handle *handle, const char *name) |
2ef84c95 | 622 | { |
cd80958d DG |
623 | struct lttcomm_session_msg lsm; |
624 | ||
9d697d3d DG |
625 | /* Safety check. Both are mandatory */ |
626 | if (handle == NULL || name == NULL) { | |
cd80958d DG |
627 | return -1; |
628 | } | |
629 | ||
441c16a7 MD |
630 | memset(&lsm, 0, sizeof(lsm)); |
631 | ||
cd80958d | 632 | lsm.cmd_type = LTTNG_DISABLE_CHANNEL; |
1df4dedd | 633 | |
9d697d3d DG |
634 | copy_string(lsm.u.disable.channel_name, name, |
635 | sizeof(lsm.u.disable.channel_name)); | |
636 | ||
cd80958d DG |
637 | copy_lttng_domain(&lsm.domain, &handle->domain); |
638 | ||
639 | copy_string(lsm.session.name, handle->session_name, | |
640 | sizeof(lsm.session.name)); | |
641 | ||
642 | return ask_sessiond(&lsm, NULL); | |
ca95a216 DG |
643 | } |
644 | ||
fac6795d | 645 | /* |
1c8d13c8 TD |
646 | * Lists all available tracepoints of domain. |
647 | * Sets the contents of the events array. | |
648 | * Returns the number of lttng_event entries in events; | |
649 | * on error, returns a negative value. | |
fac6795d | 650 | */ |
cd80958d | 651 | int lttng_list_tracepoints(struct lttng_handle *handle, |
2a71efd5 | 652 | struct lttng_event **events) |
fac6795d | 653 | { |
052da939 | 654 | int ret; |
cd80958d DG |
655 | struct lttcomm_session_msg lsm; |
656 | ||
9d697d3d | 657 | if (handle == NULL) { |
cd80958d DG |
658 | return -1; |
659 | } | |
fac6795d | 660 | |
cd80958d DG |
661 | lsm.cmd_type = LTTNG_LIST_TRACEPOINTS; |
662 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
2a71efd5 | 663 | |
cd80958d | 664 | ret = ask_sessiond(&lsm, (void **) events); |
052da939 DG |
665 | if (ret < 0) { |
666 | return ret; | |
eb354453 | 667 | } |
fac6795d | 668 | |
9f19cc17 | 669 | return ret / sizeof(struct lttng_event); |
fac6795d DG |
670 | } |
671 | ||
1657e9bb | 672 | /* |
1c8d13c8 TD |
673 | * Returns a human readable string describing |
674 | * the error code (a negative value). | |
1657e9bb | 675 | */ |
9a745bc7 | 676 | const char *lttng_strerror(int code) |
1657e9bb | 677 | { |
1c8d13c8 | 678 | /* lttcomm error codes range from -LTTCOMM_OK down to -LTTCOMM_NR */ |
7d29a247 DG |
679 | if (code > -LTTCOMM_OK) { |
680 | return "Ended with errors"; | |
1657e9bb DG |
681 | } |
682 | ||
7d29a247 | 683 | return lttcomm_get_readable_code(code); |
1657e9bb DG |
684 | } |
685 | ||
aaf97519 | 686 | /* |
1c8d13c8 TD |
687 | * Create a brand new session using name and path. |
688 | * Returns size of returned session payload data or a negative error code. | |
aaf97519 | 689 | */ |
38057ed1 | 690 | int lttng_create_session(const char *name, const char *path) |
aaf97519 | 691 | { |
cd80958d DG |
692 | struct lttcomm_session_msg lsm; |
693 | ||
694 | lsm.cmd_type = LTTNG_CREATE_SESSION; | |
695 | copy_string(lsm.session.name, name, sizeof(lsm.session.name)); | |
696 | copy_string(lsm.session.path, path, sizeof(lsm.session.path)); | |
697 | ||
698 | return ask_sessiond(&lsm, NULL); | |
8028d920 DG |
699 | } |
700 | ||
701 | /* | |
8028d920 | 702 | * Destroy session using name. |
1c8d13c8 | 703 | * Returns size of returned session payload data or a negative error code. |
8028d920 | 704 | */ |
843f5df9 | 705 | int lttng_destroy_session(const char *session_name) |
8028d920 | 706 | { |
cd80958d DG |
707 | struct lttcomm_session_msg lsm; |
708 | ||
843f5df9 | 709 | if (session_name == NULL) { |
cd80958d DG |
710 | return -1; |
711 | } | |
712 | ||
713 | lsm.cmd_type = LTTNG_DESTROY_SESSION; | |
843f5df9 DG |
714 | |
715 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); | |
cd80958d DG |
716 | |
717 | return ask_sessiond(&lsm, NULL); | |
aaf97519 DG |
718 | } |
719 | ||
57167058 | 720 | /* |
57167058 | 721 | * Ask the session daemon for all available sessions. |
1c8d13c8 TD |
722 | * Sets the contents of the sessions array. |
723 | * Returns the number of lttng_session entries in sessions; | |
724 | * on error, returns a negative value. | |
57167058 | 725 | */ |
ca95a216 | 726 | int lttng_list_sessions(struct lttng_session **sessions) |
57167058 | 727 | { |
ca95a216 | 728 | int ret; |
cd80958d | 729 | struct lttcomm_session_msg lsm; |
57167058 | 730 | |
cd80958d DG |
731 | lsm.cmd_type = LTTNG_LIST_SESSIONS; |
732 | ret = ask_sessiond(&lsm, (void**) sessions); | |
57167058 | 733 | if (ret < 0) { |
ca95a216 | 734 | return ret; |
57167058 DG |
735 | } |
736 | ||
ca95a216 | 737 | return ret / sizeof(struct lttng_session); |
57167058 DG |
738 | } |
739 | ||
9f19cc17 | 740 | /* |
1c8d13c8 TD |
741 | * Ask the session daemon for all available domains of a session. |
742 | * Sets the contents of the domains array. | |
743 | * Returns the number of lttng_domain entries in domains; | |
744 | * on error, returns a negative value. | |
9f19cc17 | 745 | */ |
330be774 | 746 | int lttng_list_domains(const char *session_name, |
cd80958d | 747 | struct lttng_domain **domains) |
9f19cc17 DG |
748 | { |
749 | int ret; | |
cd80958d DG |
750 | struct lttcomm_session_msg lsm; |
751 | ||
330be774 | 752 | if (session_name == NULL) { |
cd80958d DG |
753 | return -1; |
754 | } | |
9f19cc17 | 755 | |
cd80958d DG |
756 | lsm.cmd_type = LTTNG_LIST_DOMAINS; |
757 | ||
330be774 | 758 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); |
cd80958d DG |
759 | |
760 | ret = ask_sessiond(&lsm, (void**) domains); | |
9f19cc17 DG |
761 | if (ret < 0) { |
762 | return ret; | |
763 | } | |
764 | ||
765 | return ret / sizeof(struct lttng_domain); | |
766 | } | |
767 | ||
768 | /* | |
1c8d13c8 TD |
769 | * Ask the session daemon for all available channels of a session. |
770 | * Sets the contents of the channels array. | |
771 | * Returns the number of lttng_channel entries in channels; | |
772 | * on error, returns a negative value. | |
9f19cc17 | 773 | */ |
cd80958d DG |
774 | int lttng_list_channels(struct lttng_handle *handle, |
775 | struct lttng_channel **channels) | |
9f19cc17 DG |
776 | { |
777 | int ret; | |
cd80958d DG |
778 | struct lttcomm_session_msg lsm; |
779 | ||
9d697d3d | 780 | if (handle == NULL) { |
cd80958d DG |
781 | return -1; |
782 | } | |
783 | ||
784 | lsm.cmd_type = LTTNG_LIST_CHANNELS; | |
785 | copy_string(lsm.session.name, handle->session_name, | |
786 | sizeof(lsm.session.name)); | |
9f19cc17 | 787 | |
cd80958d | 788 | copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 789 | |
cd80958d | 790 | ret = ask_sessiond(&lsm, (void**) channels); |
9f19cc17 DG |
791 | if (ret < 0) { |
792 | return ret; | |
793 | } | |
794 | ||
795 | return ret / sizeof(struct lttng_channel); | |
796 | } | |
797 | ||
798 | /* | |
1c8d13c8 TD |
799 | * Ask the session daemon for all available events of a session channel. |
800 | * Sets the contents of the events array. | |
801 | * Returns the number of lttng_event entries in events; | |
802 | * on error, returns a negative value. | |
9f19cc17 | 803 | */ |
cd80958d DG |
804 | int lttng_list_events(struct lttng_handle *handle, |
805 | const char *channel_name, struct lttng_event **events) | |
9f19cc17 DG |
806 | { |
807 | int ret; | |
cd80958d | 808 | struct lttcomm_session_msg lsm; |
9f19cc17 | 809 | |
9d697d3d DG |
810 | /* Safety check. An handle and channel name are mandatory */ |
811 | if (handle == NULL || channel_name == NULL) { | |
cd80958d DG |
812 | return -1; |
813 | } | |
814 | ||
815 | lsm.cmd_type = LTTNG_LIST_EVENTS; | |
816 | copy_string(lsm.session.name, handle->session_name, | |
817 | sizeof(lsm.session.name)); | |
818 | copy_string(lsm.u.list.channel_name, channel_name, | |
819 | sizeof(lsm.u.list.channel_name)); | |
820 | ||
821 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
9f19cc17 | 822 | |
cd80958d | 823 | ret = ask_sessiond(&lsm, (void**) events); |
9f19cc17 DG |
824 | if (ret < 0) { |
825 | return ret; | |
826 | } | |
827 | ||
828 | return ret / sizeof(struct lttng_event); | |
829 | } | |
830 | ||
fac6795d | 831 | /* |
1c8d13c8 TD |
832 | * Sets the tracing_group variable with name. |
833 | * This function allocates memory pointed to by tracing_group. | |
834 | * On success, returns 0, on error, returns -1 (null name) or -ENOMEM. | |
fac6795d DG |
835 | */ |
836 | int lttng_set_tracing_group(const char *name) | |
837 | { | |
9d697d3d DG |
838 | if (name == NULL) { |
839 | return -1; | |
840 | } | |
841 | ||
fac6795d DG |
842 | if (asprintf(&tracing_group, "%s", name) < 0) { |
843 | return -ENOMEM; | |
844 | } | |
845 | ||
846 | return 0; | |
847 | } | |
848 | ||
d0254c7c | 849 | /* |
af87c45a | 850 | * Returns size of returned session payload data or a negative error code. |
d0254c7c | 851 | */ |
cd80958d | 852 | int lttng_calibrate(struct lttng_handle *handle, |
d0254c7c MD |
853 | struct lttng_calibrate *calibrate) |
854 | { | |
cd80958d | 855 | struct lttcomm_session_msg lsm; |
d0254c7c | 856 | |
9d697d3d DG |
857 | /* Safety check. NULL pointer are forbidden */ |
858 | if (handle == NULL || calibrate == NULL) { | |
cd80958d DG |
859 | return -1; |
860 | } | |
d0254c7c | 861 | |
cd80958d DG |
862 | lsm.cmd_type = LTTNG_CALIBRATE; |
863 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
d0254c7c | 864 | |
cd80958d DG |
865 | memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate)); |
866 | ||
867 | return ask_sessiond(&lsm, NULL); | |
d0254c7c MD |
868 | } |
869 | ||
5edd7e09 DG |
870 | /* |
871 | * Set default channel attributes. | |
441c16a7 | 872 | * If either or both of the arguments are null, attr content is zeroe'd. |
5edd7e09 DG |
873 | */ |
874 | void lttng_channel_set_default_attr(struct lttng_domain *domain, | |
875 | struct lttng_channel_attr *attr) | |
876 | { | |
441c16a7 MD |
877 | memset(attr, 0, sizeof(struct lttng_channel_attr)); |
878 | ||
5edd7e09 DG |
879 | /* Safety check */ |
880 | if (attr == NULL || domain == NULL) { | |
881 | return; | |
882 | } | |
883 | ||
884 | switch (domain->type) { | |
885 | case LTTNG_DOMAIN_KERNEL: | |
886 | attr->overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
887 | attr->switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
888 | attr->read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
889 | ||
890 | attr->subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE; | |
891 | attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; | |
892 | attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
893 | break; | |
894 | case LTTNG_DOMAIN_UST: | |
d78d6610 | 895 | #if 0 |
5edd7e09 DG |
896 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
897 | case LTTNG_DOMAIN_UST_PID: | |
898 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 899 | #endif |
5edd7e09 DG |
900 | attr->overwrite = DEFAULT_CHANNEL_OVERWRITE; |
901 | attr->switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
902 | attr->read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
903 | ||
904 | attr->subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE; | |
905 | attr->num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM; | |
906 | attr->output = DEFAULT_UST_CHANNEL_OUTPUT; | |
907 | break; | |
908 | default: | |
441c16a7 | 909 | /* Default behavior: leave set to 0. */ |
5edd7e09 DG |
910 | break; |
911 | } | |
912 | } | |
913 | ||
fac6795d | 914 | /* |
2269e89e | 915 | * Check if session daemon is alive. |
fac6795d | 916 | * |
2269e89e | 917 | * Return 1 if alive or 0 if not. |
1c8d13c8 | 918 | * On error returns a negative value. |
fac6795d | 919 | */ |
947308c4 | 920 | int lttng_session_daemon_alive(void) |
fac6795d DG |
921 | { |
922 | int ret; | |
923 | ||
924 | ret = set_session_daemon_path(); | |
925 | if (ret < 0) { | |
947308c4 | 926 | /* Error */ |
fac6795d DG |
927 | return ret; |
928 | } | |
929 | ||
2269e89e DG |
930 | if (strlen(sessiond_sock_path) == 0) { |
931 | /* No socket path set. Weird error */ | |
932 | return -1; | |
fac6795d DG |
933 | } |
934 | ||
2269e89e | 935 | ret = try_connect_sessiond(sessiond_sock_path); |
7d8234d9 MD |
936 | if (ret < 0) { |
937 | /* Not alive */ | |
938 | return 0; | |
939 | } | |
7d8234d9 | 940 | |
947308c4 DG |
941 | /* Is alive */ |
942 | return 1; | |
fac6795d DG |
943 | } |
944 | ||
945 | /* | |
946 | * lib constructor | |
947 | */ | |
948 | static void __attribute__((constructor)) init() | |
949 | { | |
950 | /* Set default session group */ | |
bbccc3d2 | 951 | lttng_set_tracing_group(DEFAULT_TRACING_GROUP); |
fac6795d | 952 | } |