Add snapshot output init call that uses URIs
[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");
577
578 /* Check for data availability */
579 do {
6d805429 580 data_ret = lttng_data_pending(session_name);
38ee087f
DG
581 if (data_ret < 0) {
582 /* Return the data available call error. */
583 ret = data_ret;
584 goto error;
585 }
586
587 /*
588 * Data sleep time before retrying (in usec). Don't sleep if the call
589 * returned value indicates availability.
590 */
6d805429 591 if (data_ret) {
38ee087f
DG
592 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
593 _MSG(".");
594 }
6d805429 595 } while (data_ret != 0);
38ee087f
DG
596
597 MSG("");
598
599end:
600error:
601 return ret;
602}
603
604/*
605 * Stop tracing and wait for data availability.
606 */
607int lttng_stop_tracing(const char *session_name)
608{
609 return _lttng_stop_tracing(session_name, 1);
610}
611
612/*
613 * Stop tracing but _don't_ wait for data availability.
614 */
615int lttng_stop_tracing_no_wait(const char *session_name)
616{
617 return _lttng_stop_tracing(session_name, 0);
f3ed775e
DG
618}
619
620/*
601d5acf
DG
621 * Add context to a channel.
622 *
623 * If the given channel is NULL, add the contexts to all channels.
624 * The event_name param is ignored.
af87c45a
DG
625 *
626 * Returns the size of the returned payload data or a negative error code.
1df4dedd 627 */
cd80958d 628int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
629 struct lttng_event_context *ctx, const char *event_name,
630 const char *channel_name)
d65106b1 631{
cd80958d
DG
632 struct lttcomm_session_msg lsm;
633
9d697d3d
DG
634 /* Safety check. Both are mandatory */
635 if (handle == NULL || ctx == NULL) {
2f70b271 636 return -LTTNG_ERR_INVALID;
cd80958d
DG
637 }
638
441c16a7
MD
639 memset(&lsm, 0, sizeof(lsm));
640
cd80958d
DG
641 lsm.cmd_type = LTTNG_ADD_CONTEXT;
642
643 /* Copy channel name */
cac3069d 644 lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name,
cd80958d 645 sizeof(lsm.u.context.channel_name));
cd80958d 646
cac3069d 647 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d65106b1 648
9d697d3d 649 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
d65106b1 650
cac3069d 651 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
652 sizeof(lsm.session.name));
653
cac3069d 654 return lttng_ctl_ask_sessiond(&lsm, NULL);
d65106b1
DG
655}
656
f3ed775e 657/*
1c8d13c8
TD
658 * Enable event(s) for a channel.
659 * If no event name is specified, all events are enabled.
660 * If no channel name is specified, the default 'channel0' is used.
661 * Returns size of returned session payload data or a negative error code.
f3ed775e 662 */
cd80958d 663int lttng_enable_event(struct lttng_handle *handle,
38057ed1 664 struct lttng_event *ev, const char *channel_name)
1df4dedd 665{
cd80958d
DG
666 struct lttcomm_session_msg lsm;
667
5117eeec 668 if (handle == NULL || ev == NULL) {
2f70b271 669 return -LTTNG_ERR_INVALID;
cd80958d 670 }
33a2b854 671
441c16a7
MD
672 memset(&lsm, 0, sizeof(lsm));
673
5117eeec 674 /* If no channel name, we put the default name */
94cf3c47 675 if (channel_name == NULL) {
cac3069d 676 lttng_ctl_copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME,
cd80958d 677 sizeof(lsm.u.enable.channel_name));
33a2b854 678 } else {
cac3069d 679 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
cd80958d 680 sizeof(lsm.u.enable.channel_name));
eb354453
DG
681 }
682
cac3069d 683 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
0d0c377a 684
8c9ae521 685 if (ev->name[0] != '\0') {
cd80958d 686 lsm.cmd_type = LTTNG_ENABLE_EVENT;
0d0c377a 687 } else {
cd80958d 688 lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
f3ed775e 689 }
8c9ae521 690 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
f3ed775e 691
cac3069d 692 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
693 sizeof(lsm.session.name));
694
cac3069d 695 return lttng_ctl_ask_sessiond(&lsm, NULL);
1df4dedd
DG
696}
697
53a80697 698/*
025faf73 699 * Create or enable an event with a filter expression.
178191b3 700 *
53a80697
MD
701 * Return negative error value on error.
702 * Return size of returned session payload data if OK.
703 */
025faf73 704int lttng_enable_event_with_filter(struct lttng_handle *handle,
178191b3 705 struct lttng_event *event, const char *channel_name,
53a80697
MD
706 const char *filter_expression)
707{
708 struct lttcomm_session_msg lsm;
709 struct filter_parser_ctx *ctx;
710 FILE *fmem;
711 int ret = 0;
712
52df2401
MD
713 if (!filter_expression) {
714 /*
715 * Fall back to normal event enabling if no filter
716 * specified.
717 */
718 return lttng_enable_event(handle, event, channel_name);
719 }
720
721 /*
722 * Empty filter string will always be rejected by the parser
723 * anyway, so treat this corner-case early to eliminate
724 * lttng_fmemopen error for 0-byte allocation.
725 */
726 if (handle == NULL || filter_expression[0] == '\0') {
2f70b271 727 return -LTTNG_ERR_INVALID;
53a80697
MD
728 }
729
53a80697
MD
730 /*
731 * casting const to non-const, as the underlying function will
732 * use it in read-only mode.
733 */
734 fmem = lttng_fmemopen((void *) filter_expression,
735 strlen(filter_expression), "r");
736 if (!fmem) {
737 fprintf(stderr, "Error opening memory as stream\n");
ff7ef7b8 738 return -LTTNG_ERR_FILTER_NOMEM;
53a80697
MD
739 }
740 ctx = filter_parser_ctx_alloc(fmem);
741 if (!ctx) {
742 fprintf(stderr, "Error allocating parser\n");
ff7ef7b8 743 ret = -LTTNG_ERR_FILTER_NOMEM;
53a80697
MD
744 goto alloc_error;
745 }
746 ret = filter_parser_ctx_append_ast(ctx);
747 if (ret) {
748 fprintf(stderr, "Parse error\n");
ff7ef7b8 749 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
750 goto parse_error;
751 }
752 ret = filter_visitor_set_parent(ctx);
753 if (ret) {
754 fprintf(stderr, "Set parent error\n");
ff7ef7b8 755 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
756 goto parse_error;
757 }
758 if (print_xml) {
759 ret = filter_visitor_print_xml(ctx, stdout, 0);
760 if (ret) {
761 fflush(stdout);
762 fprintf(stderr, "XML print error\n");
ff7ef7b8 763 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
764 goto parse_error;
765 }
766 }
767
768 dbg_printf("Generating IR... ");
769 fflush(stdout);
770 ret = filter_visitor_ir_generate(ctx);
771 if (ret) {
772 fprintf(stderr, "Generate IR error\n");
ff7ef7b8 773 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
774 goto parse_error;
775 }
776 dbg_printf("done\n");
777
778 dbg_printf("Validating IR... ");
779 fflush(stdout);
780 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
781 if (ret) {
ff7ef7b8 782 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
783 goto parse_error;
784 }
785 dbg_printf("done\n");
786
787 dbg_printf("Generating bytecode... ");
788 fflush(stdout);
789 ret = filter_visitor_bytecode_generate(ctx);
790 if (ret) {
791 fprintf(stderr, "Generate bytecode error\n");
ff7ef7b8 792 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
793 goto parse_error;
794 }
795 dbg_printf("done\n");
796 dbg_printf("Size of bytecode generated: %u bytes.\n",
797 bytecode_get_len(&ctx->bytecode->b));
798
799 memset(&lsm, 0, sizeof(lsm));
800
025faf73 801 lsm.cmd_type = LTTNG_ENABLE_EVENT_WITH_FILTER;
53a80697
MD
802
803 /* Copy channel name */
cac3069d 804 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
025faf73 805 sizeof(lsm.u.enable.channel_name));
53a80697 806 /* Copy event name */
178191b3
DG
807 if (event) {
808 memcpy(&lsm.u.enable.event, event, sizeof(lsm.u.enable.event));
809 }
810
025faf73 811 lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
53a80697
MD
812 + bytecode_get_len(&ctx->bytecode->b);
813
cac3069d 814 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
53a80697 815
cac3069d 816 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
53a80697
MD
817 sizeof(lsm.session.name));
818
cac3069d 819 ret = lttng_ctl_ask_sessiond_varlen(&lsm, &ctx->bytecode->b,
025faf73 820 lsm.u.enable.bytecode_len, NULL);
53a80697
MD
821
822 filter_bytecode_free(ctx);
823 filter_ir_free(ctx);
824 filter_parser_ctx_free(ctx);
825 if (fclose(fmem) != 0) {
826 perror("fclose");
827 }
828 return ret;
829
830parse_error:
831 filter_bytecode_free(ctx);
832 filter_ir_free(ctx);
833 filter_parser_ctx_free(ctx);
834alloc_error:
835 if (fclose(fmem) != 0) {
836 perror("fclose");
837 }
838 return ret;
839}
840
1df4dedd 841/*
1c8d13c8
TD
842 * Disable event(s) of a channel and domain.
843 * If no event name is specified, all events are disabled.
844 * If no channel name is specified, the default 'channel0' is used.
845 * Returns size of returned session payload data or a negative error code.
1df4dedd 846 */
cd80958d 847int lttng_disable_event(struct lttng_handle *handle, const char *name,
38057ed1 848 const char *channel_name)
1df4dedd 849{
cd80958d 850 struct lttcomm_session_msg lsm;
1df4dedd 851
9d697d3d 852 if (handle == NULL) {
2f70b271 853 return -LTTNG_ERR_INVALID;
cd80958d
DG
854 }
855
441c16a7
MD
856 memset(&lsm, 0, sizeof(lsm));
857
cd80958d 858 if (channel_name) {
cac3069d 859 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
cd80958d 860 sizeof(lsm.u.disable.channel_name));
f3ed775e 861 } else {
cac3069d 862 lttng_ctl_copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME,
cd80958d 863 sizeof(lsm.u.disable.channel_name));
eb354453
DG
864 }
865
cac3069d 866 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f5177a38 867
f84efadf 868 if (name != NULL) {
cac3069d
DG
869 lttng_ctl_copy_string(lsm.u.disable.name, name,
870 sizeof(lsm.u.disable.name));
cd80958d 871 lsm.cmd_type = LTTNG_DISABLE_EVENT;
f5177a38 872 } else {
cd80958d 873 lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
f3ed775e
DG
874 }
875
cac3069d 876 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
877 sizeof(lsm.session.name));
878
cac3069d 879 return lttng_ctl_ask_sessiond(&lsm, NULL);
1df4dedd
DG
880}
881
882/*
1c8d13c8
TD
883 * Enable channel per domain
884 * Returns size of returned session payload data or a negative error code.
a5c5a2bd 885 */
cd80958d 886int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 887 struct lttng_channel *chan)
a5c5a2bd 888{
cd80958d
DG
889 struct lttcomm_session_msg lsm;
890
5117eeec
DG
891 /*
892 * NULL arguments are forbidden. No default values.
893 */
894 if (handle == NULL || chan == NULL) {
2f70b271 895 return -LTTNG_ERR_INVALID;
cd80958d
DG
896 }
897
441c16a7
MD
898 memset(&lsm, 0, sizeof(lsm));
899
5117eeec 900 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
7d29a247 901
cd80958d
DG
902 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
903
cac3069d 904 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 905
cac3069d 906 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
907 sizeof(lsm.session.name));
908
cac3069d 909 return lttng_ctl_ask_sessiond(&lsm, NULL);
8c0faa1d 910}
1df4dedd 911
2ef84c95 912/*
1c8d13c8
TD
913 * All tracing will be stopped for registered events of the channel.
914 * Returns size of returned session payload data or a negative error code.
2ef84c95 915 */
cd80958d 916int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 917{
cd80958d
DG
918 struct lttcomm_session_msg lsm;
919
9d697d3d
DG
920 /* Safety check. Both are mandatory */
921 if (handle == NULL || name == NULL) {
2f70b271 922 return -LTTNG_ERR_INVALID;
cd80958d
DG
923 }
924
441c16a7
MD
925 memset(&lsm, 0, sizeof(lsm));
926
cd80958d 927 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 928
cac3069d 929 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
9d697d3d
DG
930 sizeof(lsm.u.disable.channel_name));
931
cac3069d 932 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cd80958d 933
cac3069d 934 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
935 sizeof(lsm.session.name));
936
cac3069d 937 return lttng_ctl_ask_sessiond(&lsm, NULL);
ca95a216
DG
938}
939
fac6795d 940/*
1c8d13c8
TD
941 * Lists all available tracepoints of domain.
942 * Sets the contents of the events array.
943 * Returns the number of lttng_event entries in events;
944 * on error, returns a negative value.
fac6795d 945 */
cd80958d 946int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 947 struct lttng_event **events)
fac6795d 948{
052da939 949 int ret;
cd80958d
DG
950 struct lttcomm_session_msg lsm;
951
9d697d3d 952 if (handle == NULL) {
2f70b271 953 return -LTTNG_ERR_INVALID;
cd80958d 954 }
fac6795d 955
cd80958d 956 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
cac3069d 957 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 958
cac3069d 959 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
052da939
DG
960 if (ret < 0) {
961 return ret;
eb354453 962 }
fac6795d 963
9f19cc17 964 return ret / sizeof(struct lttng_event);
fac6795d
DG
965}
966
f37d259d
MD
967/*
968 * Lists all available tracepoint fields of domain.
969 * Sets the contents of the event field array.
970 * Returns the number of lttng_event_field entries in events;
971 * on error, returns a negative value.
972 */
973int lttng_list_tracepoint_fields(struct lttng_handle *handle,
974 struct lttng_event_field **fields)
975{
976 int ret;
977 struct lttcomm_session_msg lsm;
978
979 if (handle == NULL) {
2f70b271 980 return -LTTNG_ERR_INVALID;
f37d259d
MD
981 }
982
983 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
cac3069d 984 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f37d259d 985
cac3069d 986 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
f37d259d
MD
987 if (ret < 0) {
988 return ret;
989 }
990
991 return ret / sizeof(struct lttng_event_field);
992}
993
1657e9bb 994/*
1c8d13c8
TD
995 * Returns a human readable string describing
996 * the error code (a negative value).
1657e9bb 997 */
9a745bc7 998const char *lttng_strerror(int code)
1657e9bb 999{
f73fabfd 1000 return error_get_str(code);
1657e9bb
DG
1001}
1002
aaf97519 1003/*
a4b92340
DG
1004 * Create a brand new session using name and url for destination.
1005 *
f73fabfd 1006 * Returns LTTNG_OK on success or a negative error code.
00e2e675 1007 */
a4b92340 1008int lttng_create_session(const char *name, const char *url)
00e2e675 1009{
3dd05a85 1010 int ret;
a4b92340 1011 ssize_t size;
00e2e675 1012 struct lttcomm_session_msg lsm;
a4b92340 1013 struct lttng_uri *uris = NULL;
00e2e675 1014
a4b92340 1015 if (name == NULL) {
2f70b271 1016 return -LTTNG_ERR_INVALID;
00e2e675
DG
1017 }
1018
a4b92340 1019 memset(&lsm, 0, sizeof(lsm));
00e2e675 1020
a4b92340 1021 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1022 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
a4b92340
DG
1023
1024 /* There should never be a data URL */
bc894455 1025 size = uri_parse_str_urls(url, NULL, &uris);
a4b92340 1026 if (size < 0) {
2f70b271 1027 return -LTTNG_ERR_INVALID;
00e2e675
DG
1028 }
1029
a4b92340
DG
1030 lsm.u.uri.size = size;
1031
cac3069d
DG
1032 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1033 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1034
1035 free(uris);
1036 return ret;
00e2e675
DG
1037}
1038
8028d920 1039/*
8028d920 1040 * Destroy session using name.
1c8d13c8 1041 * Returns size of returned session payload data or a negative error code.
8028d920 1042 */
843f5df9 1043int lttng_destroy_session(const char *session_name)
8028d920 1044{
cd80958d
DG
1045 struct lttcomm_session_msg lsm;
1046
843f5df9 1047 if (session_name == NULL) {
2f70b271 1048 return -LTTNG_ERR_INVALID;
cd80958d
DG
1049 }
1050
1051 lsm.cmd_type = LTTNG_DESTROY_SESSION;
843f5df9 1052
cac3069d
DG
1053 lttng_ctl_copy_string(lsm.session.name, session_name,
1054 sizeof(lsm.session.name));
cd80958d 1055
cac3069d 1056 return lttng_ctl_ask_sessiond(&lsm, NULL);
aaf97519
DG
1057}
1058
57167058 1059/*
57167058 1060 * Ask the session daemon for all available sessions.
1c8d13c8
TD
1061 * Sets the contents of the sessions array.
1062 * Returns the number of lttng_session entries in sessions;
1063 * on error, returns a negative value.
57167058 1064 */
ca95a216 1065int lttng_list_sessions(struct lttng_session **sessions)
57167058 1066{
ca95a216 1067 int ret;
cd80958d 1068 struct lttcomm_session_msg lsm;
57167058 1069
cd80958d 1070 lsm.cmd_type = LTTNG_LIST_SESSIONS;
cac3069d 1071 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
57167058 1072 if (ret < 0) {
ca95a216 1073 return ret;
57167058
DG
1074 }
1075
ca95a216 1076 return ret / sizeof(struct lttng_session);
57167058
DG
1077}
1078
9f19cc17 1079/*
1c8d13c8
TD
1080 * Ask the session daemon for all available domains of a session.
1081 * Sets the contents of the domains array.
1082 * Returns the number of lttng_domain entries in domains;
1083 * on error, returns a negative value.
9f19cc17 1084 */
330be774 1085int lttng_list_domains(const char *session_name,
cd80958d 1086 struct lttng_domain **domains)
9f19cc17
DG
1087{
1088 int ret;
cd80958d
DG
1089 struct lttcomm_session_msg lsm;
1090
330be774 1091 if (session_name == NULL) {
2f70b271 1092 return -LTTNG_ERR_INVALID;
cd80958d 1093 }
9f19cc17 1094
cd80958d
DG
1095 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1096
cac3069d
DG
1097 lttng_ctl_copy_string(lsm.session.name, session_name,
1098 sizeof(lsm.session.name));
cd80958d 1099
cac3069d 1100 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
9f19cc17
DG
1101 if (ret < 0) {
1102 return ret;
1103 }
1104
1105 return ret / sizeof(struct lttng_domain);
1106}
1107
1108/*
1c8d13c8
TD
1109 * Ask the session daemon for all available channels of a session.
1110 * Sets the contents of the channels array.
1111 * Returns the number of lttng_channel entries in channels;
1112 * on error, returns a negative value.
9f19cc17 1113 */
cd80958d
DG
1114int lttng_list_channels(struct lttng_handle *handle,
1115 struct lttng_channel **channels)
9f19cc17
DG
1116{
1117 int ret;
cd80958d
DG
1118 struct lttcomm_session_msg lsm;
1119
9d697d3d 1120 if (handle == NULL) {
2f70b271 1121 return -LTTNG_ERR_INVALID;
cd80958d
DG
1122 }
1123
1124 lsm.cmd_type = LTTNG_LIST_CHANNELS;
cac3069d 1125 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1126 sizeof(lsm.session.name));
9f19cc17 1127
cac3069d 1128 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1129
cac3069d 1130 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
9f19cc17
DG
1131 if (ret < 0) {
1132 return ret;
1133 }
1134
1135 return ret / sizeof(struct lttng_channel);
1136}
1137
1138/*
1c8d13c8
TD
1139 * Ask the session daemon for all available events of a session channel.
1140 * Sets the contents of the events array.
1141 * Returns the number of lttng_event entries in events;
1142 * on error, returns a negative value.
9f19cc17 1143 */
cd80958d
DG
1144int lttng_list_events(struct lttng_handle *handle,
1145 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
1146{
1147 int ret;
cd80958d 1148 struct lttcomm_session_msg lsm;
9f19cc17 1149
9d697d3d
DG
1150 /* Safety check. An handle and channel name are mandatory */
1151 if (handle == NULL || channel_name == NULL) {
2f70b271 1152 return -LTTNG_ERR_INVALID;
cd80958d
DG
1153 }
1154
1155 lsm.cmd_type = LTTNG_LIST_EVENTS;
cac3069d 1156 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1157 sizeof(lsm.session.name));
cac3069d 1158 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
cd80958d
DG
1159 sizeof(lsm.u.list.channel_name));
1160
cac3069d 1161 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1162
cac3069d 1163 ret = lttng_ctl_ask_sessiond(&lsm, (void**) events);
9f19cc17
DG
1164 if (ret < 0) {
1165 return ret;
1166 }
1167
1168 return ret / sizeof(struct lttng_event);
1169}
1170
fac6795d 1171/*
1c8d13c8
TD
1172 * Sets the tracing_group variable with name.
1173 * This function allocates memory pointed to by tracing_group.
1174 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
fac6795d
DG
1175 */
1176int lttng_set_tracing_group(const char *name)
1177{
9d697d3d 1178 if (name == NULL) {
2f70b271 1179 return -LTTNG_ERR_INVALID;
9d697d3d
DG
1180 }
1181
fac6795d 1182 if (asprintf(&tracing_group, "%s", name) < 0) {
2f70b271 1183 return -LTTNG_ERR_FATAL;
fac6795d
DG
1184 }
1185
1186 return 0;
1187}
1188
d0254c7c 1189/*
af87c45a 1190 * Returns size of returned session payload data or a negative error code.
d0254c7c 1191 */
cd80958d 1192int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
1193 struct lttng_calibrate *calibrate)
1194{
cd80958d 1195 struct lttcomm_session_msg lsm;
d0254c7c 1196
9d697d3d
DG
1197 /* Safety check. NULL pointer are forbidden */
1198 if (handle == NULL || calibrate == NULL) {
2f70b271 1199 return -LTTNG_ERR_INVALID;
cd80958d 1200 }
d0254c7c 1201
cd80958d 1202 lsm.cmd_type = LTTNG_CALIBRATE;
cac3069d 1203 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d0254c7c 1204
cd80958d
DG
1205 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
1206
cac3069d 1207 return lttng_ctl_ask_sessiond(&lsm, NULL);
d0254c7c
MD
1208}
1209
5edd7e09
DG
1210/*
1211 * Set default channel attributes.
441c16a7 1212 * If either or both of the arguments are null, attr content is zeroe'd.
5edd7e09
DG
1213 */
1214void lttng_channel_set_default_attr(struct lttng_domain *domain,
1215 struct lttng_channel_attr *attr)
1216{
1217 /* Safety check */
1218 if (attr == NULL || domain == NULL) {
1219 return;
1220 }
1221
eacaa7a6
DS
1222 memset(attr, 0, sizeof(struct lttng_channel_attr));
1223
0a9c6494
DG
1224 /* Same for all domains. */
1225 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
1226 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
1227 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
1228
5edd7e09
DG
1229 switch (domain->type) {
1230 case LTTNG_DOMAIN_KERNEL:
d92ff3ef
DG
1231 attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
1232 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
3e230f92 1233 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
5edd7e09
DG
1234 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
1235 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1236 break;
1237 case LTTNG_DOMAIN_UST:
0a9c6494
DG
1238 switch (domain->buf_type) {
1239 case LTTNG_BUFFER_PER_UID:
1240 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
1241 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
1242 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
1243 attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
1244 attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER;
1245 break;
1246 case LTTNG_BUFFER_PER_PID:
1247 default:
1248 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
1249 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
1250 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
1251 attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
1252 attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER;
1253 break;
1254 }
5edd7e09 1255 default:
441c16a7 1256 /* Default behavior: leave set to 0. */
5edd7e09
DG
1257 break;
1258 }
1259}
1260
fac6795d 1261/*
2269e89e 1262 * Check if session daemon is alive.
fac6795d 1263 *
2269e89e 1264 * Return 1 if alive or 0 if not.
1c8d13c8 1265 * On error returns a negative value.
fac6795d 1266 */
947308c4 1267int lttng_session_daemon_alive(void)
fac6795d
DG
1268{
1269 int ret;
1270
1271 ret = set_session_daemon_path();
1272 if (ret < 0) {
947308c4 1273 /* Error */
fac6795d
DG
1274 return ret;
1275 }
1276
9d035200 1277 if (*sessiond_sock_path == '\0') {
2f70b271
DG
1278 /*
1279 * No socket path set. Weird error which means the constructor was not
1280 * called.
1281 */
1282 assert(0);
fac6795d
DG
1283 }
1284
2269e89e 1285 ret = try_connect_sessiond(sessiond_sock_path);
7d8234d9
MD
1286 if (ret < 0) {
1287 /* Not alive */
1288 return 0;
1289 }
7d8234d9 1290
947308c4
DG
1291 /* Is alive */
1292 return 1;
fac6795d
DG
1293}
1294
00e2e675 1295/*
a4b92340 1296 * Set URL for a consumer for a session and domain.
00e2e675
DG
1297 *
1298 * Return 0 on success, else a negative value.
1299 */
a4b92340
DG
1300int lttng_set_consumer_url(struct lttng_handle *handle,
1301 const char *control_url, const char *data_url)
00e2e675 1302{
3dd05a85 1303 int ret;
a4b92340 1304 ssize_t size;
00e2e675 1305 struct lttcomm_session_msg lsm;
a4b92340 1306 struct lttng_uri *uris = NULL;
00e2e675 1307
a4b92340 1308 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
2f70b271 1309 return -LTTNG_ERR_INVALID;
00e2e675
DG
1310 }
1311
a4b92340
DG
1312 memset(&lsm, 0, sizeof(lsm));
1313
00e2e675
DG
1314 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
1315
cac3069d 1316 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
00e2e675 1317 sizeof(lsm.session.name));
cac3069d 1318 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
00e2e675 1319
bc894455 1320 size = uri_parse_str_urls(control_url, data_url, &uris);
a4b92340 1321 if (size < 0) {
2f70b271 1322 return -LTTNG_ERR_INVALID;
a4b92340
DG
1323 }
1324
1325 lsm.u.uri.size = size;
00e2e675 1326
cac3069d
DG
1327 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1328 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1329
1330 free(uris);
1331 return ret;
00e2e675
DG
1332}
1333
1334/*
9c6bda17 1335 * [OBSOLETE]
00e2e675
DG
1336 */
1337int lttng_enable_consumer(struct lttng_handle *handle)
1338{
785d2d0d 1339 return -ENOSYS;
00e2e675
DG
1340}
1341
1342/*
9c6bda17 1343 * [OBSOLETE]
00e2e675
DG
1344 */
1345int lttng_disable_consumer(struct lttng_handle *handle)
1346{
785d2d0d 1347 return -ENOSYS;
00e2e675
DG
1348}
1349
44a5e5eb
DG
1350/*
1351 * Set health socket path by putting it in the global health_sock_path
1352 * variable.
1353 *
1354 * Returns 0 on success or assert(0) on ENOMEM.
1355 */
1356static int set_health_socket_path(void)
1357{
44a5e5eb
DG
1358 int in_tgroup = 0; /* In tracing group */
1359 uid_t uid;
1360 const char *home;
1361
1362 uid = getuid();
1363
1364 if (uid != 0) {
1365 /* Are we in the tracing group ? */
1366 in_tgroup = check_tracing_group(tracing_group);
1367 }
1368
1369 if ((uid == 0) || in_tgroup) {
cac3069d
DG
1370 lttng_ctl_copy_string(health_sock_path,
1371 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK, sizeof(health_sock_path));
44a5e5eb
DG
1372 }
1373
1374 if (uid != 0) {
c617c0c6
MD
1375 int ret;
1376
44a5e5eb
DG
1377 /*
1378 * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
1379 * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
1380 */
feb0f3e5 1381 home = utils_get_home_dir();
44a5e5eb
DG
1382 if (home == NULL) {
1383 /* Fallback in /tmp .. */
1384 home = "/tmp";
1385 }
1386
1387 ret = snprintf(health_sock_path, sizeof(health_sock_path),
1388 DEFAULT_HOME_HEALTH_UNIX_SOCK, home);
1389 if ((ret < 0) || (ret >= sizeof(health_sock_path))) {
1390 /* ENOMEM at this point... just kill the control lib. */
1391 assert(0);
1392 }
1393 }
1394
1395 return 0;
1396}
1397
1398/*
1399 * Check session daemon health for a specific health component.
1400 *
2f70b271 1401 * Return 0 if health is OK or else 1 if BAD.
44a5e5eb 1402 *
2f70b271 1403 * Any other negative value is a lttng error code which can be translated with
44a5e5eb
DG
1404 * lttng_strerror().
1405 */
1406int lttng_health_check(enum lttng_health_component c)
1407{
1408 int sock, ret;
1409 struct lttcomm_health_msg msg;
1410 struct lttcomm_health_data reply;
1411
1412 /* Connect to the sesssion daemon */
1413 sock = lttcomm_connect_unix_sock(health_sock_path);
1414 if (sock < 0) {
2f70b271 1415 ret = -LTTNG_ERR_NO_SESSIOND;
44a5e5eb
DG
1416 goto error;
1417 }
1418
1419 msg.cmd = LTTNG_HEALTH_CHECK;
1420 msg.component = c;
1421
1422 ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg));
1423 if (ret < 0) {
2f70b271 1424 ret = -LTTNG_ERR_FATAL;
44a5e5eb
DG
1425 goto close_error;
1426 }
1427
1428 ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply));
1429 if (ret < 0) {
2f70b271 1430 ret = -LTTNG_ERR_FATAL;
44a5e5eb
DG
1431 goto close_error;
1432 }
1433
1434 ret = reply.ret_code;
1435
1436close_error:
67ef15b7
MD
1437 {
1438 int closeret;
1439
1440 closeret = close(sock);
1441 assert(!closeret);
1442 }
44a5e5eb
DG
1443
1444error:
1445 return ret;
1446}
1447
07424f16
DG
1448/*
1449 * This is an extension of create session that is ONLY and SHOULD only be used
1450 * by the lttng command line program. It exists to avoid using URI parsing in
1451 * the lttng client.
1452 *
1453 * We need the date and time for the trace path subdirectory for the case where
1454 * the user does NOT define one using either -o or -U. Using the normal
1455 * lttng_create_session API call, we have no clue on the session daemon side if
1456 * the URL was generated automatically by the client or define by the user.
1457 *
1458 * So this function "wrapper" is hidden from the public API, takes the datetime
1459 * string and appends it if necessary to the URI subdirectory before sending it
1460 * to the session daemon.
1461 *
1462 * With this extra function, the lttng_create_session call behavior is not
1463 * changed and the timestamp is appended to the URI on the session daemon side
1464 * if necessary.
1465 */
1466int _lttng_create_session_ext(const char *name, const char *url,
1467 const char *datetime)
1468{
3dd05a85 1469 int ret;
07424f16
DG
1470 ssize_t size;
1471 struct lttcomm_session_msg lsm;
1472 struct lttng_uri *uris = NULL;
1473
2bba9e53 1474 if (name == NULL || datetime == NULL) {
2f70b271 1475 return -LTTNG_ERR_INVALID;
07424f16
DG
1476 }
1477
1478 memset(&lsm, 0, sizeof(lsm));
1479
1480 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1481 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
07424f16
DG
1482
1483 /* There should never be a data URL */
bc894455 1484 size = uri_parse_str_urls(url, NULL, &uris);
07424f16 1485 if (size < 0) {
3dd05a85
DG
1486 ret = -LTTNG_ERR_INVALID;
1487 goto error;
07424f16
DG
1488 }
1489
1490 lsm.u.uri.size = size;
1491
4b35a6b3 1492 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
da4aa2b8
DG
1493 /* Don't append datetime if the name was automatically created. */
1494 if (strncmp(name, DEFAULT_SESSION_NAME "-",
1495 strlen(DEFAULT_SESSION_NAME) + 1)) {
1496 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
1497 name, datetime);
1498 } else {
1499 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
1500 }
07424f16
DG
1501 if (ret < 0) {
1502 PERROR("snprintf uri subdir");
3dd05a85
DG
1503 ret = -LTTNG_ERR_FATAL;
1504 goto error;
07424f16
DG
1505 }
1506 }
1507
cac3069d
DG
1508 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1509 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1510
1511error:
1512 free(uris);
1513 return ret;
07424f16
DG
1514}
1515
806e2684
DG
1516/*
1517 * For a given session name, this call checks if the data is ready to be read
1518 * or is still being extracted by the consumer(s) hence not ready to be used by
1519 * any readers.
1520 */
6d805429 1521int lttng_data_pending(const char *session_name)
806e2684
DG
1522{
1523 int ret;
1524 struct lttcomm_session_msg lsm;
1525
1526 if (session_name == NULL) {
1527 return -LTTNG_ERR_INVALID;
1528 }
1529
6d805429 1530 lsm.cmd_type = LTTNG_DATA_PENDING;
806e2684 1531
cac3069d
DG
1532 lttng_ctl_copy_string(lsm.session.name, session_name,
1533 sizeof(lsm.session.name));
806e2684 1534
cac3069d 1535 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
806e2684
DG
1536
1537 /*
cac3069d
DG
1538 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1539 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1540 * that the data is available. Yes it is hackish but for now this is the
1541 * only way.
806e2684
DG
1542 */
1543 if (ret == -1) {
1544 ret = 1;
1545 }
1546
1547 return ret;
1548}
1549
fac6795d
DG
1550/*
1551 * lib constructor
1552 */
1553static void __attribute__((constructor)) init()
1554{
1555 /* Set default session group */
bbccc3d2 1556 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
44a5e5eb
DG
1557 /* Set socket for health check */
1558 (void) set_health_socket_path();
fac6795d 1559}
49cca668
DG
1560
1561/*
1562 * lib destructor
1563 */
1564static void __attribute__((destructor)) lttng_ctl_exit()
1565{
1566 free(tracing_group);
1567}
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