Fix lttng list usage
[lttng-tools.git] / src / lib / lttng-ctl / lttng-ctl.c
CommitLineData
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 */
37static int sessiond_socket;
38static char sessiond_sock_path[PATH_MAX];
39
fac6795d
DG
40/* Variables */
41static char *tracing_group;
42static int connected;
43
99497cd0
MD
44/*
45 * Copy string from src to dst and enforce null terminated byte.
46 */
47static 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 */
63static 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:
77 dst->type = LTTNG_DOMAIN_KERNEL;
78 break;
79 }
80 }
81}
82
83/*
84 * Send lttcomm_session_msg to the session daemon.
fac6795d 85 *
1c8d13c8
TD
86 * On success, returns the number of bytes sent (>=0)
87 * On error, returns -1
fac6795d 88 */
cd80958d 89static int send_session_msg(struct lttcomm_session_msg *lsm)
fac6795d
DG
90{
91 int ret;
92
93 if (!connected) {
e065084a
DG
94 ret = -ENOTCONN;
95 goto end;
fac6795d
DG
96 }
97
be040666 98 ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
cd80958d 99 sizeof(struct lttcomm_session_msg));
e065084a
DG
100
101end:
102 return ret;
103}
104
105/*
cd80958d 106 * Receive data from the sessiond socket.
e065084a 107 *
1c8d13c8
TD
108 * On success, returns the number of bytes received (>=0)
109 * On error, returns -1 (recvmsg() error) or -ENOTCONN
e065084a 110 */
ca95a216 111static int recv_data_sessiond(void *buf, size_t len)
e065084a
DG
112{
113 int ret;
114
115 if (!connected) {
116 ret = -ENOTCONN;
117 goto end;
fac6795d
DG
118 }
119
ca95a216 120 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
fac6795d 121
e065084a 122end:
fac6795d
DG
123 return ret;
124}
125
126/*
1c8d13c8 127 * Check if we are in the specified group.
65beb5ff 128 *
2269e89e 129 * If yes return 1, else return -1.
947308c4
DG
130 */
131static int check_tracing_group(const char *grp_name)
132{
133 struct group *grp_tracing; /* no free(). See getgrnam(3) */
134 gid_t *grp_list;
135 int grp_list_size, grp_id, i;
136 int ret = -1;
137
138 /* Get GID of group 'tracing' */
139 grp_tracing = getgrnam(grp_name);
140 if (grp_tracing == NULL) {
141 /* NULL means not found also. getgrnam(3) */
142 if (errno != 0) {
143 perror("getgrnam");
144 }
145 goto end;
146 }
147
148 /* Get number of supplementary group IDs */
149 grp_list_size = getgroups(0, NULL);
150 if (grp_list_size < 0) {
151 perror("getgroups");
152 goto end;
153 }
154
155 /* Alloc group list of the right size */
156 grp_list = malloc(grp_list_size * sizeof(gid_t));
00795392 157 if (!grp_list) {
1c8d13c8 158 perror("malloc");
00795392
MD
159 goto end;
160 }
947308c4 161 grp_id = getgroups(grp_list_size, grp_list);
1c8d13c8 162 if (grp_id < 0) {
947308c4
DG
163 perror("getgroups");
164 goto free_list;
165 }
166
167 for (i = 0; i < grp_list_size; i++) {
168 if (grp_list[i] == grp_tracing->gr_gid) {
2269e89e 169 ret = 1;
947308c4
DG
170 break;
171 }
172 }
173
174free_list:
175 free(grp_list);
176
177end:
178 return ret;
179}
180
181/*
2269e89e
DG
182 * Try connect to session daemon with sock_path.
183 *
184 * Return 0 on success, else -1
185 */
186static int try_connect_sessiond(const char *sock_path)
187{
188 int ret;
189
190 /* If socket exist, we check if the daemon listens for connect. */
191 ret = access(sock_path, F_OK);
192 if (ret < 0) {
193 /* Not alive */
194 return -1;
195 }
196
197 ret = lttcomm_connect_unix_sock(sock_path);
198 if (ret < 0) {
199 /* Not alive */
200 return -1;
201 }
202
203 ret = lttcomm_close_unix_sock(ret);
204 if (ret < 0) {
205 perror("lttcomm_close_unix_sock");
206 }
207
208 return 0;
209}
210
211/*
1c8d13c8
TD
212 * Set sessiond socket path by putting it in the global
213 * sessiond_sock_path variable.
214 * Returns 0 on success,
215 * -ENOMEM on failure (the sessiond socket path is somehow too long)
947308c4
DG
216 */
217static int set_session_daemon_path(void)
218{
219 int ret;
2269e89e
DG
220 int in_tgroup = 0; /* In tracing group */
221 uid_t uid;
222
223 uid = getuid();
947308c4 224
2269e89e
DG
225 if (uid != 0) {
226 /* Are we in the tracing group ? */
227 in_tgroup = check_tracing_group(tracing_group);
228 }
229
230 if (uid == 0) {
231 /* Root */
232 copy_string(sessiond_sock_path,
233 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
234 sizeof(sessiond_sock_path));
235 } else if (in_tgroup) {
236 /* Tracing group */
237 copy_string(sessiond_sock_path,
238 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
239 sizeof(sessiond_sock_path));
240
241 ret = try_connect_sessiond(sessiond_sock_path);
242 if (ret < 0) {
243 /* Global session daemon not available */
244 if (snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
245 DEFAULT_HOME_CLIENT_UNIX_SOCK,
246 getenv("HOME")) < 0) {
247 return -ENOMEM;
248 }
249 }
250 } else {
251 /* Not in tracing group and not root, default */
99497cd0 252 if (snprintf(sessiond_sock_path, PATH_MAX,
cd80958d
DG
253 DEFAULT_HOME_CLIENT_UNIX_SOCK,
254 getenv("HOME")) < 0) {
947308c4
DG
255 return -ENOMEM;
256 }
947308c4
DG
257 }
258
259 return 0;
260}
261
65beb5ff
DG
262/*
263 * Connect to the LTTng session daemon.
264 *
265 * On success, return 0. On error, return -1.
266 */
267static int connect_sessiond(void)
268{
269 int ret;
270
271 ret = set_session_daemon_path();
272 if (ret < 0) {
1c8d13c8 273 return -1; /* set_session_daemon_path() returns -ENOMEM */
65beb5ff
DG
274 }
275
276 /* Connect to the sesssion daemon */
277 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
278 if (ret < 0) {
279 return ret;
280 }
281
282 sessiond_socket = ret;
283 connected = 1;
284
285 return 0;
286}
287
288/*
1c8d13c8
TD
289 * Clean disconnect from the session daemon.
290 * On success, return 0. On error, return -1.
65beb5ff
DG
291 */
292static int disconnect_sessiond(void)
293{
294 int ret = 0;
295
296 if (connected) {
297 ret = lttcomm_close_unix_sock(sessiond_socket);
298 sessiond_socket = 0;
299 connected = 0;
300 }
301
302 return ret;
303}
304
35a6fdb7 305/*
cd80958d 306 * Ask the session daemon a specific command and put the data into buf.
65beb5ff 307 *
af87c45a 308 * Return size of data (only payload, not header) or a negative error code.
65beb5ff 309 */
cd80958d 310static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
65beb5ff
DG
311{
312 int ret;
313 size_t size;
314 void *data = NULL;
cd80958d 315 struct lttcomm_lttng_msg llm;
65beb5ff
DG
316
317 ret = connect_sessiond();
318 if (ret < 0) {
319 goto end;
320 }
321
65beb5ff 322 /* Send command to session daemon */
cd80958d 323 ret = send_session_msg(lsm);
65beb5ff
DG
324 if (ret < 0) {
325 goto end;
326 }
327
328 /* Get header from data transmission */
329 ret = recv_data_sessiond(&llm, sizeof(llm));
330 if (ret < 0) {
331 goto end;
332 }
333
334 /* Check error code if OK */
335 if (llm.ret_code != LTTCOMM_OK) {
336 ret = -llm.ret_code;
337 goto end;
338 }
339
340 size = llm.data_size;
341 if (size == 0) {
874d3f84 342 /* If client free with size 0 */
a45d5536
DG
343 if (buf != NULL) {
344 *buf = NULL;
345 }
7d29a247 346 ret = 0;
65beb5ff
DG
347 goto end;
348 }
349
350 data = (void*) malloc(size);
351
352 /* Get payload data */
353 ret = recv_data_sessiond(data, size);
354 if (ret < 0) {
355 free(data);
356 goto end;
357 }
358
83009e5e
DG
359 /*
360 * Extra protection not to dereference a NULL pointer. If buf is NULL at
361 * this point, an error is returned and data is freed.
362 */
363 if (buf == NULL) {
364 ret = -1;
365 free(data);
366 goto end;
367 }
368
65beb5ff
DG
369 *buf = data;
370 ret = size;
371
372end:
373 disconnect_sessiond();
374 return ret;
375}
376
9f19cc17 377/*
cd80958d 378 * Create lttng handle and return pointer.
1c8d13c8 379 * The returned pointer will be NULL in case of malloc() error.
9f19cc17 380 */
cd80958d
DG
381struct lttng_handle *lttng_create_handle(const char *session_name,
382 struct lttng_domain *domain)
9f19cc17 383{
cd80958d
DG
384 struct lttng_handle *handle;
385
386 handle = malloc(sizeof(struct lttng_handle));
387 if (handle == NULL) {
388 perror("malloc handle");
389 goto end;
390 }
391
392 /* Copy session name */
393 copy_string(handle->session_name, session_name,
394 sizeof(handle->session_name));
395
396 /* Copy lttng domain */
397 copy_lttng_domain(&handle->domain, domain);
398
399end:
400 return handle;
401}
402
403/*
404 * Destroy handle by free(3) the pointer.
405 */
406void lttng_destroy_handle(struct lttng_handle *handle)
407{
408 if (handle) {
409 free(handle);
eb354453
DG
410 }
411}
412
d9800920
DG
413/*
414 * Register an outside consumer.
1c8d13c8 415 * Returns size of returned session payload data or a negative error code.
d9800920
DG
416 */
417int lttng_register_consumer(struct lttng_handle *handle,
418 const char *socket_path)
419{
420 struct lttcomm_session_msg lsm;
421
422 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
423 copy_string(lsm.session.name, handle->session_name,
424 sizeof(lsm.session.name));
425 copy_lttng_domain(&lsm.domain, &handle->domain);
426
427 copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
428
429 return ask_sessiond(&lsm, NULL);
430}
431
1df4dedd 432/*
1c8d13c8
TD
433 * Start tracing for all traces of the session.
434 * Returns size of returned session payload data or a negative error code.
1df4dedd 435 */
6a4f824d 436int lttng_start_tracing(const char *session_name)
f3ed775e 437{
cd80958d
DG
438 struct lttcomm_session_msg lsm;
439
6a4f824d 440 if (session_name == NULL) {
cd80958d
DG
441 return -1;
442 }
443
444 lsm.cmd_type = LTTNG_START_TRACE;
6a4f824d
DG
445
446 copy_string(lsm.session.name, session_name, sizeof(lsm.session.name));
cd80958d
DG
447
448 return ask_sessiond(&lsm, NULL);
f3ed775e 449}
1df4dedd
DG
450
451/*
1c8d13c8
TD
452 * Stop tracing for all traces of the session.
453 * Returns size of returned session payload data or a negative error code.
f3ed775e 454 */
6a4f824d 455int lttng_stop_tracing(const char *session_name)
f3ed775e 456{
cd80958d
DG
457 struct lttcomm_session_msg lsm;
458
6a4f824d
DG
459 if (session_name == NULL) {
460 return -1;
461 }
462
cd80958d 463 lsm.cmd_type = LTTNG_STOP_TRACE;
6a4f824d
DG
464
465 copy_string(lsm.session.name, session_name, sizeof(lsm.session.name));
cd80958d
DG
466
467 return ask_sessiond(&lsm, NULL);
f3ed775e
DG
468}
469
470/*
cd80958d 471 * Add context to event or/and channel.
af87c45a
DG
472 *
473 * Returns the size of the returned payload data or a negative error code.
1df4dedd 474 */
cd80958d 475int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
476 struct lttng_event_context *ctx, const char *event_name,
477 const char *channel_name)
d65106b1 478{
cd80958d
DG
479 struct lttcomm_session_msg lsm;
480
9d697d3d
DG
481 /* Safety check. Both are mandatory */
482 if (handle == NULL || ctx == NULL) {
cd80958d
DG
483 return -1;
484 }
485
486 lsm.cmd_type = LTTNG_ADD_CONTEXT;
487
488 /* Copy channel name */
489 copy_string(lsm.u.context.channel_name, channel_name,
490 sizeof(lsm.u.context.channel_name));
491 /* Copy event name */
492 copy_string(lsm.u.context.event_name, event_name,
493 sizeof(lsm.u.context.event_name));
494
495 copy_lttng_domain(&lsm.domain, &handle->domain);
d65106b1 496
9d697d3d 497 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
d65106b1 498
cd80958d
DG
499 copy_string(lsm.session.name, handle->session_name,
500 sizeof(lsm.session.name));
501
502 return ask_sessiond(&lsm, NULL);
d65106b1
DG
503}
504
f3ed775e 505/*
1c8d13c8
TD
506 * Enable event(s) for a channel.
507 * If no event name is specified, all events are enabled.
508 * If no channel name is specified, the default 'channel0' is used.
509 * Returns size of returned session payload data or a negative error code.
f3ed775e 510 */
cd80958d 511int lttng_enable_event(struct lttng_handle *handle,
38057ed1 512 struct lttng_event *ev, const char *channel_name)
1df4dedd 513{
cd80958d
DG
514 struct lttcomm_session_msg lsm;
515
5117eeec 516 if (handle == NULL || ev == NULL) {
cd80958d
DG
517 return -1;
518 }
33a2b854 519
5117eeec 520 /* If no channel name, we put the default name */
94cf3c47 521 if (channel_name == NULL) {
cd80958d
DG
522 copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME,
523 sizeof(lsm.u.enable.channel_name));
33a2b854 524 } else {
cd80958d
DG
525 copy_string(lsm.u.enable.channel_name, channel_name,
526 sizeof(lsm.u.enable.channel_name));
eb354453
DG
527 }
528
cd80958d 529 copy_lttng_domain(&lsm.domain, &handle->domain);
0d0c377a 530
8c9ae521 531 if (ev->name[0] != '\0') {
cd80958d 532 lsm.cmd_type = LTTNG_ENABLE_EVENT;
0d0c377a 533 } else {
cd80958d 534 lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
f3ed775e 535 }
8c9ae521 536 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
f3ed775e 537
cd80958d
DG
538 copy_string(lsm.session.name, handle->session_name,
539 sizeof(lsm.session.name));
540
541 return ask_sessiond(&lsm, NULL);
1df4dedd
DG
542}
543
544/*
1c8d13c8
TD
545 * Disable event(s) of a channel and domain.
546 * If no event name is specified, all events are disabled.
547 * If no channel name is specified, the default 'channel0' is used.
548 * Returns size of returned session payload data or a negative error code.
1df4dedd 549 */
cd80958d 550int lttng_disable_event(struct lttng_handle *handle, const char *name,
38057ed1 551 const char *channel_name)
1df4dedd 552{
cd80958d 553 struct lttcomm_session_msg lsm;
1df4dedd 554
9d697d3d 555 if (handle == NULL) {
cd80958d
DG
556 return -1;
557 }
558
559 if (channel_name) {
560 copy_string(lsm.u.disable.channel_name, channel_name,
561 sizeof(lsm.u.disable.channel_name));
f3ed775e 562 } else {
cd80958d
DG
563 copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME,
564 sizeof(lsm.u.disable.channel_name));
eb354453
DG
565 }
566
cd80958d 567 copy_lttng_domain(&lsm.domain, &handle->domain);
f5177a38 568
f84efadf 569 if (name != NULL) {
cd80958d
DG
570 copy_string(lsm.u.disable.name, name, sizeof(lsm.u.disable.name));
571 lsm.cmd_type = LTTNG_DISABLE_EVENT;
f5177a38 572 } else {
cd80958d 573 lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
f3ed775e
DG
574 }
575
cd80958d
DG
576 copy_string(lsm.session.name, handle->session_name,
577 sizeof(lsm.session.name));
578
579 return ask_sessiond(&lsm, NULL);
1df4dedd
DG
580}
581
582/*
1c8d13c8
TD
583 * Enable channel per domain
584 * Returns size of returned session payload data or a negative error code.
a5c5a2bd 585 */
cd80958d 586int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 587 struct lttng_channel *chan)
a5c5a2bd 588{
cd80958d
DG
589 struct lttcomm_session_msg lsm;
590
5117eeec
DG
591 /*
592 * NULL arguments are forbidden. No default values.
593 */
594 if (handle == NULL || chan == NULL) {
cd80958d
DG
595 return -1;
596 }
597
5117eeec 598 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
7d29a247 599
cd80958d
DG
600 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
601
602 copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 603
cd80958d
DG
604 copy_string(lsm.session.name, handle->session_name,
605 sizeof(lsm.session.name));
606
607 return ask_sessiond(&lsm, NULL);
8c0faa1d 608}
1df4dedd 609
2ef84c95 610/*
1c8d13c8
TD
611 * All tracing will be stopped for registered events of the channel.
612 * Returns size of returned session payload data or a negative error code.
2ef84c95 613 */
cd80958d 614int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 615{
cd80958d
DG
616 struct lttcomm_session_msg lsm;
617
9d697d3d
DG
618 /* Safety check. Both are mandatory */
619 if (handle == NULL || name == NULL) {
cd80958d
DG
620 return -1;
621 }
622
cd80958d 623 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 624
9d697d3d
DG
625 copy_string(lsm.u.disable.channel_name, name,
626 sizeof(lsm.u.disable.channel_name));
627
cd80958d
DG
628 copy_lttng_domain(&lsm.domain, &handle->domain);
629
630 copy_string(lsm.session.name, handle->session_name,
631 sizeof(lsm.session.name));
632
633 return ask_sessiond(&lsm, NULL);
ca95a216
DG
634}
635
fac6795d 636/*
1c8d13c8
TD
637 * Lists all available tracepoints of domain.
638 * Sets the contents of the events array.
639 * Returns the number of lttng_event entries in events;
640 * on error, returns a negative value.
fac6795d 641 */
cd80958d 642int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 643 struct lttng_event **events)
fac6795d 644{
052da939 645 int ret;
cd80958d
DG
646 struct lttcomm_session_msg lsm;
647
9d697d3d 648 if (handle == NULL) {
cd80958d
DG
649 return -1;
650 }
fac6795d 651
cd80958d
DG
652 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
653 copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 654
cd80958d 655 ret = ask_sessiond(&lsm, (void **) events);
052da939
DG
656 if (ret < 0) {
657 return ret;
eb354453 658 }
fac6795d 659
9f19cc17 660 return ret / sizeof(struct lttng_event);
fac6795d
DG
661}
662
1657e9bb 663/*
1c8d13c8
TD
664 * Returns a human readable string describing
665 * the error code (a negative value).
1657e9bb 666 */
9a745bc7 667const char *lttng_strerror(int code)
1657e9bb 668{
1c8d13c8 669 /* lttcomm error codes range from -LTTCOMM_OK down to -LTTCOMM_NR */
7d29a247
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670 if (code > -LTTCOMM_OK) {
671 return "Ended with errors";
1657e9bb
DG
672 }
673
7d29a247 674 return lttcomm_get_readable_code(code);
1657e9bb
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675}
676
aaf97519 677/*
1c8d13c8
TD
678 * Create a brand new session using name and path.
679 * Returns size of returned session payload data or a negative error code.
aaf97519 680 */
38057ed1 681int lttng_create_session(const char *name, const char *path)
aaf97519 682{
cd80958d
DG
683 struct lttcomm_session_msg lsm;
684
685 lsm.cmd_type = LTTNG_CREATE_SESSION;
686 copy_string(lsm.session.name, name, sizeof(lsm.session.name));
687 copy_string(lsm.session.path, path, sizeof(lsm.session.path));
688
689 return ask_sessiond(&lsm, NULL);
8028d920
DG
690}
691
692/*
8028d920 693 * Destroy session using name.
1c8d13c8 694 * Returns size of returned session payload data or a negative error code.
8028d920 695 */
843f5df9 696int lttng_destroy_session(const char *session_name)
8028d920 697{
cd80958d
DG
698 struct lttcomm_session_msg lsm;
699
843f5df9 700 if (session_name == NULL) {
cd80958d
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701 return -1;
702 }
703
704 lsm.cmd_type = LTTNG_DESTROY_SESSION;
843f5df9
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705
706 copy_string(lsm.session.name, session_name, sizeof(lsm.session.name));
cd80958d
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707
708 return ask_sessiond(&lsm, NULL);
aaf97519
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709}
710
57167058 711/*
57167058 712 * Ask the session daemon for all available sessions.
1c8d13c8
TD
713 * Sets the contents of the sessions array.
714 * Returns the number of lttng_session entries in sessions;
715 * on error, returns a negative value.
57167058 716 */
ca95a216 717int lttng_list_sessions(struct lttng_session **sessions)
57167058 718{
ca95a216 719 int ret;
cd80958d 720 struct lttcomm_session_msg lsm;
57167058 721
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722 lsm.cmd_type = LTTNG_LIST_SESSIONS;
723 ret = ask_sessiond(&lsm, (void**) sessions);
57167058 724 if (ret < 0) {
ca95a216 725 return ret;
57167058
DG
726 }
727
ca95a216 728 return ret / sizeof(struct lttng_session);
57167058
DG
729}
730
9f19cc17 731/*
1c8d13c8
TD
732 * Ask the session daemon for all available domains of a session.
733 * Sets the contents of the domains array.
734 * Returns the number of lttng_domain entries in domains;
735 * on error, returns a negative value.
9f19cc17 736 */
330be774 737int lttng_list_domains(const char *session_name,
cd80958d 738 struct lttng_domain **domains)
9f19cc17
DG
739{
740 int ret;
cd80958d
DG
741 struct lttcomm_session_msg lsm;
742
330be774 743 if (session_name == NULL) {
cd80958d
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744 return -1;
745 }
9f19cc17 746
cd80958d
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747 lsm.cmd_type = LTTNG_LIST_DOMAINS;
748
330be774 749 copy_string(lsm.session.name, session_name, sizeof(lsm.session.name));
cd80958d
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750
751 ret = ask_sessiond(&lsm, (void**) domains);
9f19cc17
DG
752 if (ret < 0) {
753 return ret;
754 }
755
756 return ret / sizeof(struct lttng_domain);
757}
758
759/*
1c8d13c8
TD
760 * Ask the session daemon for all available channels of a session.
761 * Sets the contents of the channels array.
762 * Returns the number of lttng_channel entries in channels;
763 * on error, returns a negative value.
9f19cc17 764 */
cd80958d
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765int lttng_list_channels(struct lttng_handle *handle,
766 struct lttng_channel **channels)
9f19cc17
DG
767{
768 int ret;
cd80958d
DG
769 struct lttcomm_session_msg lsm;
770
9d697d3d 771 if (handle == NULL) {
cd80958d
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772 return -1;
773 }
774
775 lsm.cmd_type = LTTNG_LIST_CHANNELS;
776 copy_string(lsm.session.name, handle->session_name,
777 sizeof(lsm.session.name));
9f19cc17 778
cd80958d 779 copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 780
cd80958d 781 ret = ask_sessiond(&lsm, (void**) channels);
9f19cc17
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782 if (ret < 0) {
783 return ret;
784 }
785
786 return ret / sizeof(struct lttng_channel);
787}
788
789/*
1c8d13c8
TD
790 * Ask the session daemon for all available events of a session channel.
791 * Sets the contents of the events array.
792 * Returns the number of lttng_event entries in events;
793 * on error, returns a negative value.
9f19cc17 794 */
cd80958d
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795int lttng_list_events(struct lttng_handle *handle,
796 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
797{
798 int ret;
cd80958d 799 struct lttcomm_session_msg lsm;
9f19cc17 800
9d697d3d
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801 /* Safety check. An handle and channel name are mandatory */
802 if (handle == NULL || channel_name == NULL) {
cd80958d
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803 return -1;
804 }
805
806 lsm.cmd_type = LTTNG_LIST_EVENTS;
807 copy_string(lsm.session.name, handle->session_name,
808 sizeof(lsm.session.name));
809 copy_string(lsm.u.list.channel_name, channel_name,
810 sizeof(lsm.u.list.channel_name));
811
812 copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 813
cd80958d 814 ret = ask_sessiond(&lsm, (void**) events);
9f19cc17
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815 if (ret < 0) {
816 return ret;
817 }
818
819 return ret / sizeof(struct lttng_event);
820}
821
fac6795d 822/*
1c8d13c8
TD
823 * Sets the tracing_group variable with name.
824 * This function allocates memory pointed to by tracing_group.
825 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
fac6795d
DG
826 */
827int lttng_set_tracing_group(const char *name)
828{
9d697d3d
DG
829 if (name == NULL) {
830 return -1;
831 }
832
fac6795d
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833 if (asprintf(&tracing_group, "%s", name) < 0) {
834 return -ENOMEM;
835 }
836
837 return 0;
838}
839
d0254c7c 840/*
af87c45a 841 * Returns size of returned session payload data or a negative error code.
d0254c7c 842 */
cd80958d 843int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
844 struct lttng_calibrate *calibrate)
845{
cd80958d 846 struct lttcomm_session_msg lsm;
d0254c7c 847
9d697d3d
DG
848 /* Safety check. NULL pointer are forbidden */
849 if (handle == NULL || calibrate == NULL) {
cd80958d
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850 return -1;
851 }
d0254c7c 852
cd80958d
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853 lsm.cmd_type = LTTNG_CALIBRATE;
854 copy_lttng_domain(&lsm.domain, &handle->domain);
d0254c7c 855
cd80958d
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856 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
857
858 return ask_sessiond(&lsm, NULL);
d0254c7c
MD
859}
860
5edd7e09
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861/*
862 * Set default channel attributes.
1c8d13c8 863 * If either or both of the arguments are null, nothing happens.
5edd7e09
DG
864 */
865void lttng_channel_set_default_attr(struct lttng_domain *domain,
866 struct lttng_channel_attr *attr)
867{
868 /* Safety check */
869 if (attr == NULL || domain == NULL) {
870 return;
871 }
872
873 switch (domain->type) {
874 case LTTNG_DOMAIN_KERNEL:
875 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
876 attr->switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
877 attr->read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
878
879 attr->subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE;
880 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
881 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
882 break;
883 case LTTNG_DOMAIN_UST:
d78d6610 884#if 0
5edd7e09
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885 case LTTNG_DOMAIN_UST_EXEC_NAME:
886 case LTTNG_DOMAIN_UST_PID:
887 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 888#endif
5edd7e09
DG
889 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
890 attr->switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
891 attr->read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
892
893 attr->subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE;
894 attr->num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM;
895 attr->output = DEFAULT_UST_CHANNEL_OUTPUT;
896 break;
897 default:
898 /* Default behavior */
899 memset(attr, 0, sizeof(struct lttng_channel_attr));
900 break;
901 }
902}
903
fac6795d 904/*
2269e89e 905 * Check if session daemon is alive.
fac6795d 906 *
2269e89e 907 * Return 1 if alive or 0 if not.
1c8d13c8 908 * On error returns a negative value.
fac6795d 909 */
947308c4 910int lttng_session_daemon_alive(void)
fac6795d
DG
911{
912 int ret;
913
914 ret = set_session_daemon_path();
915 if (ret < 0) {
947308c4 916 /* Error */
fac6795d
DG
917 return ret;
918 }
919
2269e89e
DG
920 if (strlen(sessiond_sock_path) == 0) {
921 /* No socket path set. Weird error */
922 return -1;
fac6795d
DG
923 }
924
2269e89e 925 ret = try_connect_sessiond(sessiond_sock_path);
7d8234d9
MD
926 if (ret < 0) {
927 /* Not alive */
928 return 0;
929 }
7d8234d9 930
947308c4
DG
931 /* Is alive */
932 return 1;
fac6795d
DG
933}
934
935/*
936 * lib constructor
937 */
938static void __attribute__((constructor)) init()
939{
940 /* Set default session group */
bbccc3d2 941 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
fac6795d 942}
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