Bump version to 2.4.0-pre1
[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 *
d14d33bf
AM
8 * This library is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU Lesser General Public License, version 2.1 only,
10 * as published by the Free Software Foundation.
82a3637f
DG
11 *
12 * This library is distributed in the hope that it will be useful,
fac6795d 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
82a3637f
DG
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
d14d33bf
AM
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
fac6795d
DG
20 */
21
22#define _GNU_SOURCE
44a5e5eb 23#include <assert.h>
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>
a4b92340 34#include <common/uri.h>
feb0f3e5 35#include <common/utils.h>
1e307fab 36#include <lttng/lttng.h>
fac6795d 37
d00c599e
DG
38#include "filter/filter-ast.h"
39#include "filter/filter-parser.h"
40#include "filter/filter-bytecode.h"
41#include "filter/memstream.h"
cac3069d 42#include "lttng-ctl-helper.h"
53a80697
MD
43
44#ifdef DEBUG
d00c599e 45static const int print_xml = 1;
53a80697
MD
46#define dbg_printf(fmt, args...) \
47 printf("[debug liblttng-ctl] " fmt, ## args)
48#else
d00c599e 49static const int print_xml = 0;
53a80697
MD
50#define dbg_printf(fmt, args...) \
51do { \
52 /* do nothing but check printf format */ \
53 if (0) \
54 printf("[debug liblttnctl] " fmt, ## args); \
55} while (0)
56#endif
57
58
fac6795d
DG
59/* Socket to session daemon for communication */
60static int sessiond_socket;
61static char sessiond_sock_path[PATH_MAX];
44a5e5eb 62static char health_sock_path[PATH_MAX];
fac6795d 63
fac6795d
DG
64/* Variables */
65static char *tracing_group;
66static int connected;
67
97e19046
DG
68/* Global */
69
70/*
71 * Those two variables are used by error.h to silent or control the verbosity of
72 * error message. They are global to the library so application linking with it
73 * are able to compile correctly and also control verbosity of the library.
97e19046
DG
74 */
75int lttng_opt_quiet;
76int lttng_opt_verbose;
77
99497cd0
MD
78/*
79 * Copy string from src to dst and enforce null terminated byte.
80 */
cac3069d
DG
81LTTNG_HIDDEN
82void lttng_ctl_copy_string(char *dst, const char *src, size_t len)
99497cd0 83{
e7d6716d 84 if (src && dst) {
99497cd0
MD
85 strncpy(dst, src, len);
86 /* Enforce the NULL terminated byte */
87 dst[len - 1] = '\0';
cd80958d
DG
88 } else if (dst) {
89 dst[0] = '\0';
99497cd0
MD
90 }
91}
92
fac6795d 93/*
cd80958d 94 * Copy domain to lttcomm_session_msg domain.
fac6795d 95 *
cd80958d
DG
96 * If domain is unknown, default domain will be the kernel.
97 */
cac3069d
DG
98LTTNG_HIDDEN
99void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
100 struct lttng_domain *src)
cd80958d
DG
101{
102 if (src && dst) {
103 switch (src->type) {
00e2e675
DG
104 case LTTNG_DOMAIN_KERNEL:
105 case LTTNG_DOMAIN_UST:
00e2e675
DG
106 memcpy(dst, src, sizeof(struct lttng_domain));
107 break;
108 default:
109 memset(dst, 0, sizeof(struct lttng_domain));
00e2e675 110 break;
cd80958d
DG
111 }
112 }
113}
114
115/*
116 * Send lttcomm_session_msg to the session daemon.
fac6795d 117 *
1c8d13c8
TD
118 * On success, returns the number of bytes sent (>=0)
119 * On error, returns -1
fac6795d 120 */
cd80958d 121static int send_session_msg(struct lttcomm_session_msg *lsm)
fac6795d
DG
122{
123 int ret;
124
125 if (!connected) {
2f70b271 126 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 127 goto end;
fac6795d
DG
128 }
129
a4b92340
DG
130 DBG("LSM cmd type : %d", lsm->cmd_type);
131
be040666 132 ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
cd80958d 133 sizeof(struct lttcomm_session_msg));
2f70b271
DG
134 if (ret < 0) {
135 ret = -LTTNG_ERR_FATAL;
136 }
e065084a
DG
137
138end:
139 return ret;
140}
141
53a80697
MD
142/*
143 * Send var len data to the session daemon.
144 *
145 * On success, returns the number of bytes sent (>=0)
146 * On error, returns -1
147 */
148static int send_session_varlen(void *data, size_t len)
149{
150 int ret;
151
152 if (!connected) {
2f70b271 153 ret = -LTTNG_ERR_NO_SESSIOND;
53a80697
MD
154 goto end;
155 }
a4b92340 156
53a80697
MD
157 if (!data || !len) {
158 ret = 0;
159 goto end;
160 }
161
162 ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
2f70b271
DG
163 if (ret < 0) {
164 ret = -LTTNG_ERR_FATAL;
165 }
53a80697
MD
166
167end:
168 return ret;
169}
170
e065084a 171/*
cd80958d 172 * Receive data from the sessiond socket.
e065084a 173 *
1c8d13c8
TD
174 * On success, returns the number of bytes received (>=0)
175 * On error, returns -1 (recvmsg() error) or -ENOTCONN
e065084a 176 */
ca95a216 177static int recv_data_sessiond(void *buf, size_t len)
e065084a
DG
178{
179 int ret;
180
181 if (!connected) {
2f70b271 182 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 183 goto end;
fac6795d
DG
184 }
185
ca95a216 186 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
2f70b271
DG
187 if (ret < 0) {
188 ret = -LTTNG_ERR_FATAL;
189 }
fac6795d 190
e065084a 191end:
fac6795d
DG
192 return ret;
193}
194
195/*
1c8d13c8 196 * Check if we are in the specified group.
65beb5ff 197 *
2269e89e 198 * If yes return 1, else return -1.
947308c4
DG
199 */
200static int check_tracing_group(const char *grp_name)
201{
202 struct group *grp_tracing; /* no free(). See getgrnam(3) */
203 gid_t *grp_list;
204 int grp_list_size, grp_id, i;
205 int ret = -1;
206
207 /* Get GID of group 'tracing' */
208 grp_tracing = getgrnam(grp_name);
b4d8603b
MD
209 if (!grp_tracing) {
210 /* If grp_tracing is NULL, the group does not exist. */
947308c4
DG
211 goto end;
212 }
213
214 /* Get number of supplementary group IDs */
215 grp_list_size = getgroups(0, NULL);
216 if (grp_list_size < 0) {
217 perror("getgroups");
218 goto end;
219 }
220
221 /* Alloc group list of the right size */
222 grp_list = malloc(grp_list_size * sizeof(gid_t));
00795392 223 if (!grp_list) {
1c8d13c8 224 perror("malloc");
00795392
MD
225 goto end;
226 }
947308c4 227 grp_id = getgroups(grp_list_size, grp_list);
1c8d13c8 228 if (grp_id < 0) {
947308c4
DG
229 perror("getgroups");
230 goto free_list;
231 }
232
233 for (i = 0; i < grp_list_size; i++) {
234 if (grp_list[i] == grp_tracing->gr_gid) {
2269e89e 235 ret = 1;
947308c4
DG
236 break;
237 }
238 }
239
240free_list:
241 free(grp_list);
242
243end:
244 return ret;
245}
246
247/*
2269e89e
DG
248 * Try connect to session daemon with sock_path.
249 *
250 * Return 0 on success, else -1
251 */
252static int try_connect_sessiond(const char *sock_path)
253{
254 int ret;
255
256 /* If socket exist, we check if the daemon listens for connect. */
257 ret = access(sock_path, F_OK);
258 if (ret < 0) {
259 /* Not alive */
2f70b271 260 goto error;
2269e89e
DG
261 }
262
263 ret = lttcomm_connect_unix_sock(sock_path);
264 if (ret < 0) {
265 /* Not alive */
2f70b271 266 goto error;
2269e89e
DG
267 }
268
269 ret = lttcomm_close_unix_sock(ret);
270 if (ret < 0) {
271 perror("lttcomm_close_unix_sock");
272 }
273
274 return 0;
2f70b271
DG
275
276error:
277 return -1;
2269e89e
DG
278}
279
280/*
2f70b271
DG
281 * Set sessiond socket path by putting it in the global sessiond_sock_path
282 * variable.
283 *
284 * Returns 0 on success, negative value on failure (the sessiond socket path
285 * is somehow too long or ENOMEM).
947308c4
DG
286 */
287static int set_session_daemon_path(void)
288{
2269e89e
DG
289 int in_tgroup = 0; /* In tracing group */
290 uid_t uid;
291
292 uid = getuid();
947308c4 293
2269e89e
DG
294 if (uid != 0) {
295 /* Are we in the tracing group ? */
296 in_tgroup = check_tracing_group(tracing_group);
297 }
298
08a9c49f 299 if ((uid == 0) || in_tgroup) {
cac3069d
DG
300 lttng_ctl_copy_string(sessiond_sock_path,
301 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path));
08a9c49f 302 }
2269e89e 303
08a9c49f 304 if (uid != 0) {
c617c0c6
MD
305 int ret;
306
08a9c49f
TD
307 if (in_tgroup) {
308 /* Tracing group */
309 ret = try_connect_sessiond(sessiond_sock_path);
310 if (ret >= 0) {
311 goto end;
2269e89e 312 }
08a9c49f 313 /* Global session daemon not available... */
2269e89e 314 }
08a9c49f
TD
315 /* ...or not in tracing group (and not root), default */
316
317 /*
318 * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
319 * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
320 */
321 ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
feb0f3e5 322 DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
08a9c49f 323 if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
2f70b271 324 goto error;
947308c4 325 }
947308c4 326 }
08a9c49f 327end:
947308c4 328 return 0;
2f70b271
DG
329
330error:
331 return -1;
947308c4
DG
332}
333
65beb5ff
DG
334/*
335 * Connect to the LTTng session daemon.
336 *
337 * On success, return 0. On error, return -1.
338 */
339static int connect_sessiond(void)
340{
341 int ret;
342
da3c9ec1
DG
343 /* Don't try to connect if already connected. */
344 if (connected) {
345 return 0;
346 }
347
65beb5ff
DG
348 ret = set_session_daemon_path();
349 if (ret < 0) {
2f70b271 350 goto error;
65beb5ff
DG
351 }
352
353 /* Connect to the sesssion daemon */
354 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
355 if (ret < 0) {
2f70b271 356 goto error;
65beb5ff
DG
357 }
358
359 sessiond_socket = ret;
360 connected = 1;
361
362 return 0;
2f70b271
DG
363
364error:
365 return -1;
65beb5ff
DG
366}
367
368/*
1c8d13c8
TD
369 * Clean disconnect from the session daemon.
370 * On success, return 0. On error, return -1.
65beb5ff
DG
371 */
372static int disconnect_sessiond(void)
373{
374 int ret = 0;
375
376 if (connected) {
377 ret = lttcomm_close_unix_sock(sessiond_socket);
378 sessiond_socket = 0;
379 connected = 0;
380 }
381
382 return ret;
383}
384
35a6fdb7 385/*
cd80958d 386 * Ask the session daemon a specific command and put the data into buf.
53a80697 387 * Takes extra var. len. data as input to send to the session daemon.
65beb5ff 388 *
af87c45a 389 * Return size of data (only payload, not header) or a negative error code.
65beb5ff 390 */
cac3069d
DG
391LTTNG_HIDDEN
392int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
a4b92340 393 void *vardata, size_t varlen, void **buf)
65beb5ff
DG
394{
395 int ret;
396 size_t size;
397 void *data = NULL;
cd80958d 398 struct lttcomm_lttng_msg llm;
65beb5ff
DG
399
400 ret = connect_sessiond();
401 if (ret < 0) {
2f70b271 402 ret = -LTTNG_ERR_NO_SESSIOND;
65beb5ff
DG
403 goto end;
404 }
405
65beb5ff 406 /* Send command to session daemon */
cd80958d 407 ret = send_session_msg(lsm);
65beb5ff 408 if (ret < 0) {
2f70b271 409 /* Ret value is a valid lttng error code. */
65beb5ff
DG
410 goto end;
411 }
53a80697
MD
412 /* Send var len data */
413 ret = send_session_varlen(vardata, varlen);
414 if (ret < 0) {
2f70b271 415 /* Ret value is a valid lttng error code. */
53a80697
MD
416 goto end;
417 }
65beb5ff
DG
418
419 /* Get header from data transmission */
420 ret = recv_data_sessiond(&llm, sizeof(llm));
421 if (ret < 0) {
2f70b271 422 /* Ret value is a valid lttng error code. */
65beb5ff
DG
423 goto end;
424 }
425
426 /* Check error code if OK */
f73fabfd 427 if (llm.ret_code != LTTNG_OK) {
65beb5ff
DG
428 ret = -llm.ret_code;
429 goto end;
430 }
431
432 size = llm.data_size;
433 if (size == 0) {
874d3f84 434 /* If client free with size 0 */
a45d5536
DG
435 if (buf != NULL) {
436 *buf = NULL;
437 }
7d29a247 438 ret = 0;
65beb5ff
DG
439 goto end;
440 }
441
442 data = (void*) malloc(size);
443
444 /* Get payload data */
445 ret = recv_data_sessiond(data, size);
446 if (ret < 0) {
447 free(data);
448 goto end;
449 }
450
83009e5e
DG
451 /*
452 * Extra protection not to dereference a NULL pointer. If buf is NULL at
453 * this point, an error is returned and data is freed.
454 */
455 if (buf == NULL) {
2f70b271 456 ret = -LTTNG_ERR_INVALID;
83009e5e
DG
457 free(data);
458 goto end;
459 }
460
65beb5ff
DG
461 *buf = data;
462 ret = size;
463
464end:
465 disconnect_sessiond();
466 return ret;
467}
468
9f19cc17 469/*
cd80958d 470 * Create lttng handle and return pointer.
1c8d13c8 471 * The returned pointer will be NULL in case of malloc() error.
9f19cc17 472 */
cd80958d
DG
473struct lttng_handle *lttng_create_handle(const char *session_name,
474 struct lttng_domain *domain)
9f19cc17 475{
2f70b271
DG
476 struct lttng_handle *handle = NULL;
477
478 if (domain == NULL) {
479 goto end;
480 }
cd80958d
DG
481
482 handle = malloc(sizeof(struct lttng_handle));
483 if (handle == NULL) {
2f70b271 484 PERROR("malloc handle");
cd80958d
DG
485 goto end;
486 }
487
488 /* Copy session name */
cac3069d 489 lttng_ctl_copy_string(handle->session_name, session_name,
cd80958d
DG
490 sizeof(handle->session_name));
491
492 /* Copy lttng domain */
cac3069d 493 lttng_ctl_copy_lttng_domain(&handle->domain, domain);
cd80958d
DG
494
495end:
496 return handle;
497}
498
499/*
500 * Destroy handle by free(3) the pointer.
501 */
502void lttng_destroy_handle(struct lttng_handle *handle)
503{
0e428499 504 free(handle);
eb354453
DG
505}
506
d9800920
DG
507/*
508 * Register an outside consumer.
1c8d13c8 509 * Returns size of returned session payload data or a negative error code.
d9800920
DG
510 */
511int lttng_register_consumer(struct lttng_handle *handle,
512 const char *socket_path)
513{
514 struct lttcomm_session_msg lsm;
515
2f70b271
DG
516 if (handle == NULL || socket_path == NULL) {
517 return -LTTNG_ERR_INVALID;
518 }
519
d9800920 520 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
cac3069d 521 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
d9800920 522 sizeof(lsm.session.name));
cac3069d 523 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d9800920 524
cac3069d 525 lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
d9800920 526
cac3069d 527 return lttng_ctl_ask_sessiond(&lsm, NULL);
d9800920
DG
528}
529
1df4dedd 530/*
1c8d13c8
TD
531 * Start tracing for all traces of the session.
532 * Returns size of returned session payload data or a negative error code.
1df4dedd 533 */
6a4f824d 534int lttng_start_tracing(const char *session_name)
f3ed775e 535{
cd80958d
DG
536 struct lttcomm_session_msg lsm;
537
6a4f824d 538 if (session_name == NULL) {
2f70b271 539 return -LTTNG_ERR_INVALID;
cd80958d
DG
540 }
541
542 lsm.cmd_type = LTTNG_START_TRACE;
6a4f824d 543
cac3069d
DG
544 lttng_ctl_copy_string(lsm.session.name, session_name,
545 sizeof(lsm.session.name));
cd80958d 546
cac3069d 547 return lttng_ctl_ask_sessiond(&lsm, NULL);
f3ed775e 548}
1df4dedd
DG
549
550/*
38ee087f 551 * Stop tracing for all traces of the session.
f3ed775e 552 */
38ee087f 553static int _lttng_stop_tracing(const char *session_name, int wait)
f3ed775e 554{
38ee087f 555 int ret, data_ret;
cd80958d
DG
556 struct lttcomm_session_msg lsm;
557
6a4f824d 558 if (session_name == NULL) {
2f70b271 559 return -LTTNG_ERR_INVALID;
6a4f824d
DG
560 }
561
cd80958d 562 lsm.cmd_type = LTTNG_STOP_TRACE;
6a4f824d 563
cac3069d
DG
564 lttng_ctl_copy_string(lsm.session.name, session_name,
565 sizeof(lsm.session.name));
cd80958d 566
cac3069d 567 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
38ee087f
DG
568 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
569 goto error;
570 }
571
572 if (!wait) {
573 goto end;
574 }
575
576 _MSG("Waiting for data availability");
b7a81c24 577 fflush(stdout);
38ee087f
DG
578
579 /* Check for data availability */
580 do {
6d805429 581 data_ret = lttng_data_pending(session_name);
38ee087f
DG
582 if (data_ret < 0) {
583 /* Return the data available call error. */
584 ret = data_ret;
585 goto error;
586 }
587
588 /*
589 * Data sleep time before retrying (in usec). Don't sleep if the call
590 * returned value indicates availability.
591 */
6d805429 592 if (data_ret) {
38ee087f
DG
593 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
594 _MSG(".");
b7a81c24 595 fflush(stdout);
38ee087f 596 }
6d805429 597 } while (data_ret != 0);
38ee087f
DG
598
599 MSG("");
600
601end:
602error:
603 return ret;
604}
605
606/*
607 * Stop tracing and wait for data availability.
608 */
609int lttng_stop_tracing(const char *session_name)
610{
611 return _lttng_stop_tracing(session_name, 1);
612}
613
614/*
615 * Stop tracing but _don't_ wait for data availability.
616 */
617int lttng_stop_tracing_no_wait(const char *session_name)
618{
619 return _lttng_stop_tracing(session_name, 0);
f3ed775e
DG
620}
621
622/*
601d5acf
DG
623 * Add context to a channel.
624 *
625 * If the given channel is NULL, add the contexts to all channels.
626 * The event_name param is ignored.
af87c45a
DG
627 *
628 * Returns the size of the returned payload data or a negative error code.
1df4dedd 629 */
cd80958d 630int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
631 struct lttng_event_context *ctx, const char *event_name,
632 const char *channel_name)
d65106b1 633{
cd80958d
DG
634 struct lttcomm_session_msg lsm;
635
9d697d3d
DG
636 /* Safety check. Both are mandatory */
637 if (handle == NULL || ctx == NULL) {
2f70b271 638 return -LTTNG_ERR_INVALID;
cd80958d
DG
639 }
640
441c16a7
MD
641 memset(&lsm, 0, sizeof(lsm));
642
cd80958d
DG
643 lsm.cmd_type = LTTNG_ADD_CONTEXT;
644
85076754
MD
645 /* If no channel name, send empty string. */
646 if (channel_name == NULL) {
647 lttng_ctl_copy_string(lsm.u.context.channel_name, "",
648 sizeof(lsm.u.context.channel_name));
649 } else {
650 lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name,
651 sizeof(lsm.u.context.channel_name));
652 }
cd80958d 653
cac3069d 654 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d65106b1 655
9d697d3d 656 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
d65106b1 657
cac3069d 658 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
659 sizeof(lsm.session.name));
660
cac3069d 661 return lttng_ctl_ask_sessiond(&lsm, NULL);
d65106b1
DG
662}
663
f3ed775e 664/*
1c8d13c8
TD
665 * Enable event(s) for a channel.
666 * If no event name is specified, all events are enabled.
667 * If no channel name is specified, the default 'channel0' is used.
668 * Returns size of returned session payload data or a negative error code.
f3ed775e 669 */
cd80958d 670int lttng_enable_event(struct lttng_handle *handle,
38057ed1 671 struct lttng_event *ev, const char *channel_name)
1df4dedd 672{
cd80958d
DG
673 struct lttcomm_session_msg lsm;
674
5117eeec 675 if (handle == NULL || ev == NULL) {
2f70b271 676 return -LTTNG_ERR_INVALID;
cd80958d 677 }
33a2b854 678
441c16a7
MD
679 memset(&lsm, 0, sizeof(lsm));
680
85076754 681 /* If no channel name, send empty string. */
94cf3c47 682 if (channel_name == NULL) {
85076754 683 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
cd80958d 684 sizeof(lsm.u.enable.channel_name));
33a2b854 685 } else {
cac3069d 686 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
cd80958d 687 sizeof(lsm.u.enable.channel_name));
eb354453
DG
688 }
689
cac3069d 690 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
0d0c377a 691
8c9ae521 692 if (ev->name[0] != '\0') {
cd80958d 693 lsm.cmd_type = LTTNG_ENABLE_EVENT;
0d0c377a 694 } else {
cd80958d 695 lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
f3ed775e 696 }
8c9ae521 697 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
f3ed775e 698
cac3069d 699 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
700 sizeof(lsm.session.name));
701
cac3069d 702 return lttng_ctl_ask_sessiond(&lsm, NULL);
1df4dedd
DG
703}
704
53a80697 705/*
025faf73 706 * Create or enable an event with a filter expression.
178191b3 707 *
53a80697
MD
708 * Return negative error value on error.
709 * Return size of returned session payload data if OK.
710 */
025faf73 711int lttng_enable_event_with_filter(struct lttng_handle *handle,
178191b3 712 struct lttng_event *event, const char *channel_name,
53a80697
MD
713 const char *filter_expression)
714{
715 struct lttcomm_session_msg lsm;
716 struct filter_parser_ctx *ctx;
717 FILE *fmem;
718 int ret = 0;
719
52df2401
MD
720 if (!filter_expression) {
721 /*
722 * Fall back to normal event enabling if no filter
723 * specified.
724 */
725 return lttng_enable_event(handle, event, channel_name);
726 }
727
728 /*
729 * Empty filter string will always be rejected by the parser
730 * anyway, so treat this corner-case early to eliminate
731 * lttng_fmemopen error for 0-byte allocation.
732 */
733 if (handle == NULL || filter_expression[0] == '\0') {
2f70b271 734 return -LTTNG_ERR_INVALID;
53a80697
MD
735 }
736
53a80697
MD
737 /*
738 * casting const to non-const, as the underlying function will
739 * use it in read-only mode.
740 */
741 fmem = lttng_fmemopen((void *) filter_expression,
742 strlen(filter_expression), "r");
743 if (!fmem) {
744 fprintf(stderr, "Error opening memory as stream\n");
ff7ef7b8 745 return -LTTNG_ERR_FILTER_NOMEM;
53a80697
MD
746 }
747 ctx = filter_parser_ctx_alloc(fmem);
748 if (!ctx) {
749 fprintf(stderr, "Error allocating parser\n");
ff7ef7b8 750 ret = -LTTNG_ERR_FILTER_NOMEM;
53a80697
MD
751 goto alloc_error;
752 }
753 ret = filter_parser_ctx_append_ast(ctx);
754 if (ret) {
755 fprintf(stderr, "Parse error\n");
ff7ef7b8 756 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
757 goto parse_error;
758 }
759 ret = filter_visitor_set_parent(ctx);
760 if (ret) {
761 fprintf(stderr, "Set parent error\n");
ff7ef7b8 762 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
763 goto parse_error;
764 }
765 if (print_xml) {
766 ret = filter_visitor_print_xml(ctx, stdout, 0);
767 if (ret) {
768 fflush(stdout);
769 fprintf(stderr, "XML print error\n");
ff7ef7b8 770 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
771 goto parse_error;
772 }
773 }
774
775 dbg_printf("Generating IR... ");
776 fflush(stdout);
777 ret = filter_visitor_ir_generate(ctx);
778 if (ret) {
779 fprintf(stderr, "Generate IR error\n");
ff7ef7b8 780 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
781 goto parse_error;
782 }
783 dbg_printf("done\n");
784
785 dbg_printf("Validating IR... ");
786 fflush(stdout);
787 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
788 if (ret) {
ff7ef7b8 789 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
790 goto parse_error;
791 }
792 dbg_printf("done\n");
793
794 dbg_printf("Generating bytecode... ");
795 fflush(stdout);
796 ret = filter_visitor_bytecode_generate(ctx);
797 if (ret) {
798 fprintf(stderr, "Generate bytecode error\n");
ff7ef7b8 799 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
800 goto parse_error;
801 }
802 dbg_printf("done\n");
803 dbg_printf("Size of bytecode generated: %u bytes.\n",
804 bytecode_get_len(&ctx->bytecode->b));
805
806 memset(&lsm, 0, sizeof(lsm));
807
025faf73 808 lsm.cmd_type = LTTNG_ENABLE_EVENT_WITH_FILTER;
53a80697 809
85076754
MD
810 /* If no channel name, send empty string. */
811 if (channel_name == NULL) {
812 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
813 sizeof(lsm.u.enable.channel_name));
814 } else {
815 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
816 sizeof(lsm.u.enable.channel_name));
817 }
818
53a80697 819 /* Copy event name */
178191b3
DG
820 if (event) {
821 memcpy(&lsm.u.enable.event, event, sizeof(lsm.u.enable.event));
822 }
823
025faf73 824 lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
53a80697
MD
825 + bytecode_get_len(&ctx->bytecode->b);
826
cac3069d 827 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
53a80697 828
cac3069d 829 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
53a80697
MD
830 sizeof(lsm.session.name));
831
cac3069d 832 ret = lttng_ctl_ask_sessiond_varlen(&lsm, &ctx->bytecode->b,
025faf73 833 lsm.u.enable.bytecode_len, NULL);
53a80697
MD
834
835 filter_bytecode_free(ctx);
836 filter_ir_free(ctx);
837 filter_parser_ctx_free(ctx);
838 if (fclose(fmem) != 0) {
839 perror("fclose");
840 }
841 return ret;
842
843parse_error:
844 filter_bytecode_free(ctx);
845 filter_ir_free(ctx);
846 filter_parser_ctx_free(ctx);
847alloc_error:
848 if (fclose(fmem) != 0) {
849 perror("fclose");
850 }
851 return ret;
852}
853
1df4dedd 854/*
1c8d13c8
TD
855 * Disable event(s) of a channel and domain.
856 * If no event name is specified, all events are disabled.
857 * If no channel name is specified, the default 'channel0' is used.
858 * Returns size of returned session payload data or a negative error code.
1df4dedd 859 */
cd80958d 860int lttng_disable_event(struct lttng_handle *handle, const char *name,
38057ed1 861 const char *channel_name)
1df4dedd 862{
cd80958d 863 struct lttcomm_session_msg lsm;
1df4dedd 864
9d697d3d 865 if (handle == NULL) {
2f70b271 866 return -LTTNG_ERR_INVALID;
cd80958d
DG
867 }
868
441c16a7
MD
869 memset(&lsm, 0, sizeof(lsm));
870
85076754
MD
871 /* If no channel name, send empty string. */
872 if (channel_name == NULL) {
873 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
cd80958d 874 sizeof(lsm.u.disable.channel_name));
f3ed775e 875 } else {
85076754 876 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
cd80958d 877 sizeof(lsm.u.disable.channel_name));
eb354453
DG
878 }
879
cac3069d 880 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f5177a38 881
f84efadf 882 if (name != NULL) {
cac3069d
DG
883 lttng_ctl_copy_string(lsm.u.disable.name, name,
884 sizeof(lsm.u.disable.name));
cd80958d 885 lsm.cmd_type = LTTNG_DISABLE_EVENT;
f5177a38 886 } else {
cd80958d 887 lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
f3ed775e
DG
888 }
889
cac3069d 890 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
891 sizeof(lsm.session.name));
892
cac3069d 893 return lttng_ctl_ask_sessiond(&lsm, NULL);
1df4dedd
DG
894}
895
896/*
1c8d13c8
TD
897 * Enable channel per domain
898 * Returns size of returned session payload data or a negative error code.
a5c5a2bd 899 */
cd80958d 900int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 901 struct lttng_channel *chan)
a5c5a2bd 902{
cd80958d
DG
903 struct lttcomm_session_msg lsm;
904
5117eeec
DG
905 /*
906 * NULL arguments are forbidden. No default values.
907 */
908 if (handle == NULL || chan == NULL) {
2f70b271 909 return -LTTNG_ERR_INVALID;
cd80958d
DG
910 }
911
441c16a7
MD
912 memset(&lsm, 0, sizeof(lsm));
913
5117eeec 914 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
7d29a247 915
cd80958d
DG
916 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
917
cac3069d 918 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 919
cac3069d 920 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
921 sizeof(lsm.session.name));
922
cac3069d 923 return lttng_ctl_ask_sessiond(&lsm, NULL);
8c0faa1d 924}
1df4dedd 925
2ef84c95 926/*
1c8d13c8
TD
927 * All tracing will be stopped for registered events of the channel.
928 * Returns size of returned session payload data or a negative error code.
2ef84c95 929 */
cd80958d 930int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 931{
cd80958d
DG
932 struct lttcomm_session_msg lsm;
933
9d697d3d
DG
934 /* Safety check. Both are mandatory */
935 if (handle == NULL || name == NULL) {
2f70b271 936 return -LTTNG_ERR_INVALID;
cd80958d
DG
937 }
938
441c16a7
MD
939 memset(&lsm, 0, sizeof(lsm));
940
cd80958d 941 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 942
cac3069d 943 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
9d697d3d
DG
944 sizeof(lsm.u.disable.channel_name));
945
cac3069d 946 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cd80958d 947
cac3069d 948 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
949 sizeof(lsm.session.name));
950
cac3069d 951 return lttng_ctl_ask_sessiond(&lsm, NULL);
ca95a216
DG
952}
953
fac6795d 954/*
1c8d13c8
TD
955 * Lists all available tracepoints of domain.
956 * Sets the contents of the events array.
957 * Returns the number of lttng_event entries in events;
958 * on error, returns a negative value.
fac6795d 959 */
cd80958d 960int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 961 struct lttng_event **events)
fac6795d 962{
052da939 963 int ret;
cd80958d
DG
964 struct lttcomm_session_msg lsm;
965
9d697d3d 966 if (handle == NULL) {
2f70b271 967 return -LTTNG_ERR_INVALID;
cd80958d 968 }
fac6795d 969
cd80958d 970 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
cac3069d 971 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 972
cac3069d 973 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
052da939
DG
974 if (ret < 0) {
975 return ret;
eb354453 976 }
fac6795d 977
9f19cc17 978 return ret / sizeof(struct lttng_event);
fac6795d
DG
979}
980
f37d259d
MD
981/*
982 * Lists all available tracepoint fields of domain.
983 * Sets the contents of the event field array.
984 * Returns the number of lttng_event_field entries in events;
985 * on error, returns a negative value.
986 */
987int lttng_list_tracepoint_fields(struct lttng_handle *handle,
988 struct lttng_event_field **fields)
989{
990 int ret;
991 struct lttcomm_session_msg lsm;
992
993 if (handle == NULL) {
2f70b271 994 return -LTTNG_ERR_INVALID;
f37d259d
MD
995 }
996
997 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
cac3069d 998 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f37d259d 999
cac3069d 1000 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
f37d259d
MD
1001 if (ret < 0) {
1002 return ret;
1003 }
1004
1005 return ret / sizeof(struct lttng_event_field);
1006}
1007
1657e9bb 1008/*
1c8d13c8
TD
1009 * Returns a human readable string describing
1010 * the error code (a negative value).
1657e9bb 1011 */
9a745bc7 1012const char *lttng_strerror(int code)
1657e9bb 1013{
f73fabfd 1014 return error_get_str(code);
1657e9bb
DG
1015}
1016
aaf97519 1017/*
a4b92340
DG
1018 * Create a brand new session using name and url for destination.
1019 *
f73fabfd 1020 * Returns LTTNG_OK on success or a negative error code.
00e2e675 1021 */
a4b92340 1022int lttng_create_session(const char *name, const char *url)
00e2e675 1023{
3dd05a85 1024 int ret;
a4b92340 1025 ssize_t size;
00e2e675 1026 struct lttcomm_session_msg lsm;
a4b92340 1027 struct lttng_uri *uris = NULL;
00e2e675 1028
a4b92340 1029 if (name == NULL) {
2f70b271 1030 return -LTTNG_ERR_INVALID;
00e2e675
DG
1031 }
1032
a4b92340 1033 memset(&lsm, 0, sizeof(lsm));
00e2e675 1034
a4b92340 1035 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1036 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
a4b92340
DG
1037
1038 /* There should never be a data URL */
bc894455 1039 size = uri_parse_str_urls(url, NULL, &uris);
a4b92340 1040 if (size < 0) {
2f70b271 1041 return -LTTNG_ERR_INVALID;
00e2e675
DG
1042 }
1043
a4b92340
DG
1044 lsm.u.uri.size = size;
1045
cac3069d
DG
1046 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1047 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1048
1049 free(uris);
1050 return ret;
00e2e675
DG
1051}
1052
8028d920 1053/*
8028d920 1054 * Destroy session using name.
1c8d13c8 1055 * Returns size of returned session payload data or a negative error code.
8028d920 1056 */
843f5df9 1057int lttng_destroy_session(const char *session_name)
8028d920 1058{
cd80958d
DG
1059 struct lttcomm_session_msg lsm;
1060
843f5df9 1061 if (session_name == NULL) {
2f70b271 1062 return -LTTNG_ERR_INVALID;
cd80958d
DG
1063 }
1064
1065 lsm.cmd_type = LTTNG_DESTROY_SESSION;
843f5df9 1066
cac3069d
DG
1067 lttng_ctl_copy_string(lsm.session.name, session_name,
1068 sizeof(lsm.session.name));
cd80958d 1069
cac3069d 1070 return lttng_ctl_ask_sessiond(&lsm, NULL);
aaf97519
DG
1071}
1072
57167058 1073/*
57167058 1074 * Ask the session daemon for all available sessions.
1c8d13c8
TD
1075 * Sets the contents of the sessions array.
1076 * Returns the number of lttng_session entries in sessions;
1077 * on error, returns a negative value.
57167058 1078 */
ca95a216 1079int lttng_list_sessions(struct lttng_session **sessions)
57167058 1080{
ca95a216 1081 int ret;
cd80958d 1082 struct lttcomm_session_msg lsm;
57167058 1083
cd80958d 1084 lsm.cmd_type = LTTNG_LIST_SESSIONS;
cac3069d 1085 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
57167058 1086 if (ret < 0) {
ca95a216 1087 return ret;
57167058
DG
1088 }
1089
ca95a216 1090 return ret / sizeof(struct lttng_session);
57167058
DG
1091}
1092
9f19cc17 1093/*
1c8d13c8
TD
1094 * Ask the session daemon for all available domains of a session.
1095 * Sets the contents of the domains array.
1096 * Returns the number of lttng_domain entries in domains;
1097 * on error, returns a negative value.
9f19cc17 1098 */
330be774 1099int lttng_list_domains(const char *session_name,
cd80958d 1100 struct lttng_domain **domains)
9f19cc17
DG
1101{
1102 int ret;
cd80958d
DG
1103 struct lttcomm_session_msg lsm;
1104
330be774 1105 if (session_name == NULL) {
2f70b271 1106 return -LTTNG_ERR_INVALID;
cd80958d 1107 }
9f19cc17 1108
cd80958d
DG
1109 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1110
cac3069d
DG
1111 lttng_ctl_copy_string(lsm.session.name, session_name,
1112 sizeof(lsm.session.name));
cd80958d 1113
cac3069d 1114 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
9f19cc17
DG
1115 if (ret < 0) {
1116 return ret;
1117 }
1118
1119 return ret / sizeof(struct lttng_domain);
1120}
1121
1122/*
1c8d13c8
TD
1123 * Ask the session daemon for all available channels of a session.
1124 * Sets the contents of the channels array.
1125 * Returns the number of lttng_channel entries in channels;
1126 * on error, returns a negative value.
9f19cc17 1127 */
cd80958d
DG
1128int lttng_list_channels(struct lttng_handle *handle,
1129 struct lttng_channel **channels)
9f19cc17
DG
1130{
1131 int ret;
cd80958d
DG
1132 struct lttcomm_session_msg lsm;
1133
9d697d3d 1134 if (handle == NULL) {
2f70b271 1135 return -LTTNG_ERR_INVALID;
cd80958d
DG
1136 }
1137
1138 lsm.cmd_type = LTTNG_LIST_CHANNELS;
cac3069d 1139 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1140 sizeof(lsm.session.name));
9f19cc17 1141
cac3069d 1142 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1143
cac3069d 1144 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
9f19cc17
DG
1145 if (ret < 0) {
1146 return ret;
1147 }
1148
1149 return ret / sizeof(struct lttng_channel);
1150}
1151
1152/*
1c8d13c8
TD
1153 * Ask the session daemon for all available events of a session channel.
1154 * Sets the contents of the events array.
1155 * Returns the number of lttng_event entries in events;
1156 * on error, returns a negative value.
9f19cc17 1157 */
cd80958d
DG
1158int lttng_list_events(struct lttng_handle *handle,
1159 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
1160{
1161 int ret;
cd80958d 1162 struct lttcomm_session_msg lsm;
9f19cc17 1163
9d697d3d
DG
1164 /* Safety check. An handle and channel name are mandatory */
1165 if (handle == NULL || channel_name == NULL) {
2f70b271 1166 return -LTTNG_ERR_INVALID;
cd80958d
DG
1167 }
1168
1169 lsm.cmd_type = LTTNG_LIST_EVENTS;
cac3069d 1170 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1171 sizeof(lsm.session.name));
cac3069d 1172 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
cd80958d
DG
1173 sizeof(lsm.u.list.channel_name));
1174
cac3069d 1175 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1176
cac3069d 1177 ret = lttng_ctl_ask_sessiond(&lsm, (void**) events);
9f19cc17
DG
1178 if (ret < 0) {
1179 return ret;
1180 }
1181
1182 return ret / sizeof(struct lttng_event);
1183}
1184
fac6795d 1185/*
1c8d13c8
TD
1186 * Sets the tracing_group variable with name.
1187 * This function allocates memory pointed to by tracing_group.
1188 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
fac6795d
DG
1189 */
1190int lttng_set_tracing_group(const char *name)
1191{
9d697d3d 1192 if (name == NULL) {
2f70b271 1193 return -LTTNG_ERR_INVALID;
9d697d3d
DG
1194 }
1195
fac6795d 1196 if (asprintf(&tracing_group, "%s", name) < 0) {
2f70b271 1197 return -LTTNG_ERR_FATAL;
fac6795d
DG
1198 }
1199
1200 return 0;
1201}
1202
d0254c7c 1203/*
af87c45a 1204 * Returns size of returned session payload data or a negative error code.
d0254c7c 1205 */
cd80958d 1206int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
1207 struct lttng_calibrate *calibrate)
1208{
cd80958d 1209 struct lttcomm_session_msg lsm;
d0254c7c 1210
9d697d3d
DG
1211 /* Safety check. NULL pointer are forbidden */
1212 if (handle == NULL || calibrate == NULL) {
2f70b271 1213 return -LTTNG_ERR_INVALID;
cd80958d 1214 }
d0254c7c 1215
cd80958d 1216 lsm.cmd_type = LTTNG_CALIBRATE;
cac3069d 1217 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d0254c7c 1218
cd80958d
DG
1219 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
1220
cac3069d 1221 return lttng_ctl_ask_sessiond(&lsm, NULL);
d0254c7c
MD
1222}
1223
5edd7e09
DG
1224/*
1225 * Set default channel attributes.
441c16a7 1226 * If either or both of the arguments are null, attr content is zeroe'd.
5edd7e09
DG
1227 */
1228void lttng_channel_set_default_attr(struct lttng_domain *domain,
1229 struct lttng_channel_attr *attr)
1230{
1231 /* Safety check */
1232 if (attr == NULL || domain == NULL) {
1233 return;
1234 }
1235
eacaa7a6
DS
1236 memset(attr, 0, sizeof(struct lttng_channel_attr));
1237
0a9c6494
DG
1238 /* Same for all domains. */
1239 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
1240 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
1241 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
1242
5edd7e09
DG
1243 switch (domain->type) {
1244 case LTTNG_DOMAIN_KERNEL:
d92ff3ef
DG
1245 attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
1246 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
3e230f92 1247 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
5edd7e09
DG
1248 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
1249 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1250 break;
1251 case LTTNG_DOMAIN_UST:
0a9c6494
DG
1252 switch (domain->buf_type) {
1253 case LTTNG_BUFFER_PER_UID:
1254 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
1255 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
1256 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
1257 attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
1258 attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER;
1259 break;
1260 case LTTNG_BUFFER_PER_PID:
1261 default:
1262 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
1263 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
1264 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
1265 attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
1266 attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER;
1267 break;
1268 }
5edd7e09 1269 default:
441c16a7 1270 /* Default behavior: leave set to 0. */
5edd7e09
DG
1271 break;
1272 }
1273}
1274
fac6795d 1275/*
2269e89e 1276 * Check if session daemon is alive.
fac6795d 1277 *
2269e89e 1278 * Return 1 if alive or 0 if not.
1c8d13c8 1279 * On error returns a negative value.
fac6795d 1280 */
947308c4 1281int lttng_session_daemon_alive(void)
fac6795d
DG
1282{
1283 int ret;
1284
1285 ret = set_session_daemon_path();
1286 if (ret < 0) {
947308c4 1287 /* Error */
fac6795d
DG
1288 return ret;
1289 }
1290
9d035200 1291 if (*sessiond_sock_path == '\0') {
2f70b271
DG
1292 /*
1293 * No socket path set. Weird error which means the constructor was not
1294 * called.
1295 */
1296 assert(0);
fac6795d
DG
1297 }
1298
2269e89e 1299 ret = try_connect_sessiond(sessiond_sock_path);
7d8234d9
MD
1300 if (ret < 0) {
1301 /* Not alive */
1302 return 0;
1303 }
7d8234d9 1304
947308c4
DG
1305 /* Is alive */
1306 return 1;
fac6795d
DG
1307}
1308
00e2e675 1309/*
a4b92340 1310 * Set URL for a consumer for a session and domain.
00e2e675
DG
1311 *
1312 * Return 0 on success, else a negative value.
1313 */
a4b92340
DG
1314int lttng_set_consumer_url(struct lttng_handle *handle,
1315 const char *control_url, const char *data_url)
00e2e675 1316{
3dd05a85 1317 int ret;
a4b92340 1318 ssize_t size;
00e2e675 1319 struct lttcomm_session_msg lsm;
a4b92340 1320 struct lttng_uri *uris = NULL;
00e2e675 1321
a4b92340 1322 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
2f70b271 1323 return -LTTNG_ERR_INVALID;
00e2e675
DG
1324 }
1325
a4b92340
DG
1326 memset(&lsm, 0, sizeof(lsm));
1327
00e2e675
DG
1328 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
1329
cac3069d 1330 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
00e2e675 1331 sizeof(lsm.session.name));
cac3069d 1332 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
00e2e675 1333
bc894455 1334 size = uri_parse_str_urls(control_url, data_url, &uris);
a4b92340 1335 if (size < 0) {
2f70b271 1336 return -LTTNG_ERR_INVALID;
a4b92340
DG
1337 }
1338
1339 lsm.u.uri.size = size;
00e2e675 1340
cac3069d
DG
1341 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1342 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1343
1344 free(uris);
1345 return ret;
00e2e675
DG
1346}
1347
1348/*
9c6bda17 1349 * [OBSOLETE]
00e2e675
DG
1350 */
1351int lttng_enable_consumer(struct lttng_handle *handle)
1352{
785d2d0d 1353 return -ENOSYS;
00e2e675
DG
1354}
1355
1356/*
9c6bda17 1357 * [OBSOLETE]
00e2e675
DG
1358 */
1359int lttng_disable_consumer(struct lttng_handle *handle)
1360{
785d2d0d 1361 return -ENOSYS;
00e2e675
DG
1362}
1363
44a5e5eb
DG
1364/*
1365 * Set health socket path by putting it in the global health_sock_path
1366 * variable.
1367 *
1368 * Returns 0 on success or assert(0) on ENOMEM.
1369 */
1370static int set_health_socket_path(void)
1371{
44a5e5eb
DG
1372 int in_tgroup = 0; /* In tracing group */
1373 uid_t uid;
1374 const char *home;
1375
1376 uid = getuid();
1377
1378 if (uid != 0) {
1379 /* Are we in the tracing group ? */
1380 in_tgroup = check_tracing_group(tracing_group);
1381 }
1382
1383 if ((uid == 0) || in_tgroup) {
cac3069d
DG
1384 lttng_ctl_copy_string(health_sock_path,
1385 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK, sizeof(health_sock_path));
44a5e5eb
DG
1386 }
1387
1388 if (uid != 0) {
c617c0c6
MD
1389 int ret;
1390
44a5e5eb
DG
1391 /*
1392 * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
1393 * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
1394 */
feb0f3e5 1395 home = utils_get_home_dir();
44a5e5eb
DG
1396 if (home == NULL) {
1397 /* Fallback in /tmp .. */
1398 home = "/tmp";
1399 }
1400
1401 ret = snprintf(health_sock_path, sizeof(health_sock_path),
1402 DEFAULT_HOME_HEALTH_UNIX_SOCK, home);
1403 if ((ret < 0) || (ret >= sizeof(health_sock_path))) {
1404 /* ENOMEM at this point... just kill the control lib. */
1405 assert(0);
1406 }
1407 }
1408
1409 return 0;
1410}
1411
1412/*
1413 * Check session daemon health for a specific health component.
1414 *
2f70b271 1415 * Return 0 if health is OK or else 1 if BAD.
44a5e5eb 1416 *
2f70b271 1417 * Any other negative value is a lttng error code which can be translated with
44a5e5eb
DG
1418 * lttng_strerror().
1419 */
1420int lttng_health_check(enum lttng_health_component c)
1421{
1422 int sock, ret;
1423 struct lttcomm_health_msg msg;
1424 struct lttcomm_health_data reply;
1425
1426 /* Connect to the sesssion daemon */
1427 sock = lttcomm_connect_unix_sock(health_sock_path);
1428 if (sock < 0) {
2f70b271 1429 ret = -LTTNG_ERR_NO_SESSIOND;
44a5e5eb
DG
1430 goto error;
1431 }
1432
1433 msg.cmd = LTTNG_HEALTH_CHECK;
1434 msg.component = c;
1435
1436 ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg));
1437 if (ret < 0) {
2f70b271 1438 ret = -LTTNG_ERR_FATAL;
44a5e5eb
DG
1439 goto close_error;
1440 }
1441
1442 ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply));
1443 if (ret < 0) {
2f70b271 1444 ret = -LTTNG_ERR_FATAL;
44a5e5eb
DG
1445 goto close_error;
1446 }
1447
1448 ret = reply.ret_code;
1449
1450close_error:
67ef15b7
MD
1451 {
1452 int closeret;
1453
1454 closeret = close(sock);
1455 assert(!closeret);
1456 }
44a5e5eb
DG
1457
1458error:
1459 return ret;
1460}
1461
07424f16
DG
1462/*
1463 * This is an extension of create session that is ONLY and SHOULD only be used
1464 * by the lttng command line program. It exists to avoid using URI parsing in
1465 * the lttng client.
1466 *
1467 * We need the date and time for the trace path subdirectory for the case where
1468 * the user does NOT define one using either -o or -U. Using the normal
1469 * lttng_create_session API call, we have no clue on the session daemon side if
1470 * the URL was generated automatically by the client or define by the user.
1471 *
1472 * So this function "wrapper" is hidden from the public API, takes the datetime
1473 * string and appends it if necessary to the URI subdirectory before sending it
1474 * to the session daemon.
1475 *
1476 * With this extra function, the lttng_create_session call behavior is not
1477 * changed and the timestamp is appended to the URI on the session daemon side
1478 * if necessary.
1479 */
1480int _lttng_create_session_ext(const char *name, const char *url,
1481 const char *datetime)
1482{
3dd05a85 1483 int ret;
07424f16
DG
1484 ssize_t size;
1485 struct lttcomm_session_msg lsm;
1486 struct lttng_uri *uris = NULL;
1487
2bba9e53 1488 if (name == NULL || datetime == NULL) {
2f70b271 1489 return -LTTNG_ERR_INVALID;
07424f16
DG
1490 }
1491
1492 memset(&lsm, 0, sizeof(lsm));
1493
1494 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1495 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
07424f16
DG
1496
1497 /* There should never be a data URL */
bc894455 1498 size = uri_parse_str_urls(url, NULL, &uris);
07424f16 1499 if (size < 0) {
3dd05a85
DG
1500 ret = -LTTNG_ERR_INVALID;
1501 goto error;
07424f16
DG
1502 }
1503
1504 lsm.u.uri.size = size;
1505
4b35a6b3 1506 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
da4aa2b8
DG
1507 /* Don't append datetime if the name was automatically created. */
1508 if (strncmp(name, DEFAULT_SESSION_NAME "-",
1509 strlen(DEFAULT_SESSION_NAME) + 1)) {
1510 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
1511 name, datetime);
1512 } else {
1513 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
1514 }
07424f16
DG
1515 if (ret < 0) {
1516 PERROR("snprintf uri subdir");
3dd05a85
DG
1517 ret = -LTTNG_ERR_FATAL;
1518 goto error;
07424f16
DG
1519 }
1520 }
1521
cac3069d
DG
1522 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1523 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1524
1525error:
1526 free(uris);
1527 return ret;
07424f16
DG
1528}
1529
806e2684
DG
1530/*
1531 * For a given session name, this call checks if the data is ready to be read
1532 * or is still being extracted by the consumer(s) hence not ready to be used by
1533 * any readers.
1534 */
6d805429 1535int lttng_data_pending(const char *session_name)
806e2684
DG
1536{
1537 int ret;
1538 struct lttcomm_session_msg lsm;
1539
1540 if (session_name == NULL) {
1541 return -LTTNG_ERR_INVALID;
1542 }
1543
6d805429 1544 lsm.cmd_type = LTTNG_DATA_PENDING;
806e2684 1545
cac3069d
DG
1546 lttng_ctl_copy_string(lsm.session.name, session_name,
1547 sizeof(lsm.session.name));
806e2684 1548
cac3069d 1549 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
806e2684
DG
1550
1551 /*
cac3069d
DG
1552 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1553 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1554 * that the data is available. Yes it is hackish but for now this is the
1555 * only way.
806e2684
DG
1556 */
1557 if (ret == -1) {
1558 ret = 1;
1559 }
1560
1561 return ret;
1562}
1563
27babd3a
DG
1564/*
1565 * Create a session exclusively used for snapshot.
1566 *
1567 * Returns LTTNG_OK on success or a negative error code.
1568 */
1569int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
1570{
1571 int ret;
1572 ssize_t size;
1573 struct lttcomm_session_msg lsm;
1574 struct lttng_uri *uris = NULL;
1575
1576 if (name == NULL) {
1577 return -LTTNG_ERR_INVALID;
1578 }
1579
1580 memset(&lsm, 0, sizeof(lsm));
1581
1582 lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
1583 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1584
1585 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
1586 if (size < 0) {
1587 return -LTTNG_ERR_INVALID;
1588 }
1589
1590 lsm.u.uri.size = size;
1591
1592 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1593 sizeof(struct lttng_uri) * size, NULL);
1594
1595 free(uris);
1596 return ret;
1597}
1598
fac6795d
DG
1599/*
1600 * lib constructor
1601 */
1602static void __attribute__((constructor)) init()
1603{
1604 /* Set default session group */
bbccc3d2 1605 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
44a5e5eb
DG
1606 /* Set socket for health check */
1607 (void) set_health_socket_path();
fac6795d 1608}
49cca668
DG
1609
1610/*
1611 * lib destructor
1612 */
1613static void __attribute__((destructor)) lttng_ctl_exit()
1614{
1615 free(tracing_group);
1616}
This page took 0.218821 seconds and 4 git commands to generate.