Set event exclusions in the target when event is created
[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>
0c89d795 37#include <lttng/health-internal.h>
fac6795d 38
d00c599e
DG
39#include "filter/filter-ast.h"
40#include "filter/filter-parser.h"
41#include "filter/filter-bytecode.h"
42#include "filter/memstream.h"
cac3069d 43#include "lttng-ctl-helper.h"
53a80697
MD
44
45#ifdef DEBUG
d00c599e 46static const int print_xml = 1;
53a80697
MD
47#define dbg_printf(fmt, args...) \
48 printf("[debug liblttng-ctl] " fmt, ## args)
49#else
d00c599e 50static const int print_xml = 0;
53a80697
MD
51#define dbg_printf(fmt, args...) \
52do { \
53 /* do nothing but check printf format */ \
54 if (0) \
55 printf("[debug liblttnctl] " fmt, ## args); \
56} while (0)
57#endif
58
59
fac6795d
DG
60/* Socket to session daemon for communication */
61static int sessiond_socket;
62static char sessiond_sock_path[PATH_MAX];
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:
b9dfb167 106 case LTTNG_DOMAIN_JUL:
00e2e675
DG
107 memcpy(dst, src, sizeof(struct lttng_domain));
108 break;
109 default:
110 memset(dst, 0, sizeof(struct lttng_domain));
00e2e675 111 break;
cd80958d
DG
112 }
113 }
114}
115
116/*
117 * Send lttcomm_session_msg to the session daemon.
fac6795d 118 *
1c8d13c8
TD
119 * On success, returns the number of bytes sent (>=0)
120 * On error, returns -1
fac6795d 121 */
cd80958d 122static int send_session_msg(struct lttcomm_session_msg *lsm)
fac6795d
DG
123{
124 int ret;
125
126 if (!connected) {
2f70b271 127 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 128 goto end;
fac6795d
DG
129 }
130
a4b92340
DG
131 DBG("LSM cmd type : %d", lsm->cmd_type);
132
be040666 133 ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
cd80958d 134 sizeof(struct lttcomm_session_msg));
2f70b271
DG
135 if (ret < 0) {
136 ret = -LTTNG_ERR_FATAL;
137 }
e065084a
DG
138
139end:
140 return ret;
141}
142
53a80697
MD
143/*
144 * Send var len data to the session daemon.
145 *
146 * On success, returns the number of bytes sent (>=0)
147 * On error, returns -1
148 */
149static int send_session_varlen(void *data, size_t len)
150{
151 int ret;
152
153 if (!connected) {
2f70b271 154 ret = -LTTNG_ERR_NO_SESSIOND;
53a80697
MD
155 goto end;
156 }
a4b92340 157
53a80697
MD
158 if (!data || !len) {
159 ret = 0;
160 goto end;
161 }
162
163 ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
2f70b271
DG
164 if (ret < 0) {
165 ret = -LTTNG_ERR_FATAL;
166 }
53a80697
MD
167
168end:
169 return ret;
170}
171
e065084a 172/*
cd80958d 173 * Receive data from the sessiond socket.
e065084a 174 *
1c8d13c8
TD
175 * On success, returns the number of bytes received (>=0)
176 * On error, returns -1 (recvmsg() error) or -ENOTCONN
e065084a 177 */
ca95a216 178static int recv_data_sessiond(void *buf, size_t len)
e065084a
DG
179{
180 int ret;
181
182 if (!connected) {
2f70b271 183 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 184 goto end;
fac6795d
DG
185 }
186
ca95a216 187 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
2f70b271
DG
188 if (ret < 0) {
189 ret = -LTTNG_ERR_FATAL;
190 }
fac6795d 191
e065084a 192end:
fac6795d
DG
193 return ret;
194}
195
196/*
1c8d13c8 197 * Check if we are in the specified group.
65beb5ff 198 *
2269e89e 199 * If yes return 1, else return -1.
947308c4 200 */
6c71277b
MD
201LTTNG_HIDDEN
202int lttng_check_tracing_group(void)
947308c4
DG
203{
204 struct group *grp_tracing; /* no free(). See getgrnam(3) */
205 gid_t *grp_list;
206 int grp_list_size, grp_id, i;
207 int ret = -1;
6c71277b 208 const char *grp_name = tracing_group;
947308c4
DG
209
210 /* Get GID of group 'tracing' */
211 grp_tracing = getgrnam(grp_name);
b4d8603b
MD
212 if (!grp_tracing) {
213 /* If grp_tracing is NULL, the group does not exist. */
947308c4
DG
214 goto end;
215 }
216
217 /* Get number of supplementary group IDs */
218 grp_list_size = getgroups(0, NULL);
219 if (grp_list_size < 0) {
220 perror("getgroups");
221 goto end;
222 }
223
224 /* Alloc group list of the right size */
225 grp_list = malloc(grp_list_size * sizeof(gid_t));
00795392 226 if (!grp_list) {
1c8d13c8 227 perror("malloc");
00795392
MD
228 goto end;
229 }
947308c4 230 grp_id = getgroups(grp_list_size, grp_list);
1c8d13c8 231 if (grp_id < 0) {
947308c4
DG
232 perror("getgroups");
233 goto free_list;
234 }
235
236 for (i = 0; i < grp_list_size; i++) {
237 if (grp_list[i] == grp_tracing->gr_gid) {
2269e89e 238 ret = 1;
947308c4
DG
239 break;
240 }
241 }
242
243free_list:
244 free(grp_list);
245
246end:
247 return ret;
248}
249
250/*
2269e89e
DG
251 * Try connect to session daemon with sock_path.
252 *
253 * Return 0 on success, else -1
254 */
255static int try_connect_sessiond(const char *sock_path)
256{
257 int ret;
258
259 /* If socket exist, we check if the daemon listens for connect. */
260 ret = access(sock_path, F_OK);
261 if (ret < 0) {
262 /* Not alive */
2f70b271 263 goto error;
2269e89e
DG
264 }
265
266 ret = lttcomm_connect_unix_sock(sock_path);
267 if (ret < 0) {
268 /* Not alive */
2f70b271 269 goto error;
2269e89e
DG
270 }
271
272 ret = lttcomm_close_unix_sock(ret);
273 if (ret < 0) {
274 perror("lttcomm_close_unix_sock");
275 }
276
277 return 0;
2f70b271
DG
278
279error:
280 return -1;
2269e89e
DG
281}
282
283/*
2f70b271
DG
284 * Set sessiond socket path by putting it in the global sessiond_sock_path
285 * variable.
286 *
287 * Returns 0 on success, negative value on failure (the sessiond socket path
288 * is somehow too long or ENOMEM).
947308c4
DG
289 */
290static int set_session_daemon_path(void)
291{
2269e89e
DG
292 int in_tgroup = 0; /* In tracing group */
293 uid_t uid;
294
295 uid = getuid();
947308c4 296
2269e89e
DG
297 if (uid != 0) {
298 /* Are we in the tracing group ? */
6c71277b 299 in_tgroup = lttng_check_tracing_group();
2269e89e
DG
300 }
301
08a9c49f 302 if ((uid == 0) || in_tgroup) {
cac3069d
DG
303 lttng_ctl_copy_string(sessiond_sock_path,
304 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path));
08a9c49f 305 }
2269e89e 306
08a9c49f 307 if (uid != 0) {
c617c0c6
MD
308 int ret;
309
08a9c49f
TD
310 if (in_tgroup) {
311 /* Tracing group */
312 ret = try_connect_sessiond(sessiond_sock_path);
313 if (ret >= 0) {
314 goto end;
2269e89e 315 }
08a9c49f 316 /* Global session daemon not available... */
2269e89e 317 }
08a9c49f
TD
318 /* ...or not in tracing group (and not root), default */
319
320 /*
321 * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
322 * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
323 */
324 ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
feb0f3e5 325 DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
08a9c49f 326 if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
2f70b271 327 goto error;
947308c4 328 }
947308c4 329 }
08a9c49f 330end:
947308c4 331 return 0;
2f70b271
DG
332
333error:
334 return -1;
947308c4
DG
335}
336
65beb5ff
DG
337/*
338 * Connect to the LTTng session daemon.
339 *
340 * On success, return 0. On error, return -1.
341 */
342static int connect_sessiond(void)
343{
344 int ret;
345
da3c9ec1
DG
346 /* Don't try to connect if already connected. */
347 if (connected) {
348 return 0;
349 }
350
65beb5ff
DG
351 ret = set_session_daemon_path();
352 if (ret < 0) {
2f70b271 353 goto error;
65beb5ff
DG
354 }
355
356 /* Connect to the sesssion daemon */
357 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
358 if (ret < 0) {
2f70b271 359 goto error;
65beb5ff
DG
360 }
361
362 sessiond_socket = ret;
363 connected = 1;
364
365 return 0;
2f70b271
DG
366
367error:
368 return -1;
65beb5ff
DG
369}
370
371/*
1c8d13c8
TD
372 * Clean disconnect from the session daemon.
373 * On success, return 0. On error, return -1.
65beb5ff
DG
374 */
375static int disconnect_sessiond(void)
376{
377 int ret = 0;
378
379 if (connected) {
380 ret = lttcomm_close_unix_sock(sessiond_socket);
381 sessiond_socket = 0;
382 connected = 0;
383 }
384
385 return ret;
386}
387
35a6fdb7 388/*
cd80958d 389 * Ask the session daemon a specific command and put the data into buf.
53a80697 390 * Takes extra var. len. data as input to send to the session daemon.
65beb5ff 391 *
af87c45a 392 * Return size of data (only payload, not header) or a negative error code.
65beb5ff 393 */
cac3069d
DG
394LTTNG_HIDDEN
395int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
a4b92340 396 void *vardata, size_t varlen, void **buf)
65beb5ff
DG
397{
398 int ret;
399 size_t size;
400 void *data = NULL;
cd80958d 401 struct lttcomm_lttng_msg llm;
65beb5ff
DG
402
403 ret = connect_sessiond();
404 if (ret < 0) {
2f70b271 405 ret = -LTTNG_ERR_NO_SESSIOND;
65beb5ff
DG
406 goto end;
407 }
408
65beb5ff 409 /* Send command to session daemon */
cd80958d 410 ret = send_session_msg(lsm);
65beb5ff 411 if (ret < 0) {
2f70b271 412 /* Ret value is a valid lttng error code. */
65beb5ff
DG
413 goto end;
414 }
53a80697
MD
415 /* Send var len data */
416 ret = send_session_varlen(vardata, varlen);
417 if (ret < 0) {
2f70b271 418 /* Ret value is a valid lttng error code. */
53a80697
MD
419 goto end;
420 }
65beb5ff
DG
421
422 /* Get header from data transmission */
423 ret = recv_data_sessiond(&llm, sizeof(llm));
424 if (ret < 0) {
2f70b271 425 /* Ret value is a valid lttng error code. */
65beb5ff
DG
426 goto end;
427 }
428
429 /* Check error code if OK */
f73fabfd 430 if (llm.ret_code != LTTNG_OK) {
65beb5ff
DG
431 ret = -llm.ret_code;
432 goto end;
433 }
434
435 size = llm.data_size;
436 if (size == 0) {
874d3f84 437 /* If client free with size 0 */
a45d5536
DG
438 if (buf != NULL) {
439 *buf = NULL;
440 }
7d29a247 441 ret = 0;
65beb5ff
DG
442 goto end;
443 }
444
445 data = (void*) malloc(size);
446
447 /* Get payload data */
448 ret = recv_data_sessiond(data, size);
449 if (ret < 0) {
450 free(data);
451 goto end;
452 }
453
83009e5e
DG
454 /*
455 * Extra protection not to dereference a NULL pointer. If buf is NULL at
456 * this point, an error is returned and data is freed.
457 */
458 if (buf == NULL) {
2f70b271 459 ret = -LTTNG_ERR_INVALID;
83009e5e
DG
460 free(data);
461 goto end;
462 }
463
65beb5ff
DG
464 *buf = data;
465 ret = size;
466
467end:
468 disconnect_sessiond();
469 return ret;
470}
471
9f19cc17 472/*
cd80958d 473 * Create lttng handle and return pointer.
1c8d13c8 474 * The returned pointer will be NULL in case of malloc() error.
9f19cc17 475 */
cd80958d
DG
476struct lttng_handle *lttng_create_handle(const char *session_name,
477 struct lttng_domain *domain)
9f19cc17 478{
2f70b271
DG
479 struct lttng_handle *handle = NULL;
480
481 if (domain == NULL) {
482 goto end;
483 }
cd80958d
DG
484
485 handle = malloc(sizeof(struct lttng_handle));
486 if (handle == NULL) {
2f70b271 487 PERROR("malloc handle");
cd80958d
DG
488 goto end;
489 }
490
491 /* Copy session name */
cac3069d 492 lttng_ctl_copy_string(handle->session_name, session_name,
cd80958d
DG
493 sizeof(handle->session_name));
494
495 /* Copy lttng domain */
cac3069d 496 lttng_ctl_copy_lttng_domain(&handle->domain, domain);
cd80958d
DG
497
498end:
499 return handle;
500}
501
502/*
503 * Destroy handle by free(3) the pointer.
504 */
505void lttng_destroy_handle(struct lttng_handle *handle)
506{
0e428499 507 free(handle);
eb354453
DG
508}
509
d9800920
DG
510/*
511 * Register an outside consumer.
1c8d13c8 512 * Returns size of returned session payload data or a negative error code.
d9800920
DG
513 */
514int lttng_register_consumer(struct lttng_handle *handle,
515 const char *socket_path)
516{
517 struct lttcomm_session_msg lsm;
518
2f70b271
DG
519 if (handle == NULL || socket_path == NULL) {
520 return -LTTNG_ERR_INVALID;
521 }
522
d9800920 523 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
cac3069d 524 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
d9800920 525 sizeof(lsm.session.name));
cac3069d 526 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d9800920 527
cac3069d 528 lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
d9800920 529
cac3069d 530 return lttng_ctl_ask_sessiond(&lsm, NULL);
d9800920
DG
531}
532
1df4dedd 533/*
1c8d13c8
TD
534 * Start tracing for all traces of the session.
535 * Returns size of returned session payload data or a negative error code.
1df4dedd 536 */
6a4f824d 537int lttng_start_tracing(const char *session_name)
f3ed775e 538{
cd80958d
DG
539 struct lttcomm_session_msg lsm;
540
6a4f824d 541 if (session_name == NULL) {
2f70b271 542 return -LTTNG_ERR_INVALID;
cd80958d
DG
543 }
544
545 lsm.cmd_type = LTTNG_START_TRACE;
6a4f824d 546
cac3069d
DG
547 lttng_ctl_copy_string(lsm.session.name, session_name,
548 sizeof(lsm.session.name));
cd80958d 549
cac3069d 550 return lttng_ctl_ask_sessiond(&lsm, NULL);
f3ed775e 551}
1df4dedd
DG
552
553/*
38ee087f 554 * Stop tracing for all traces of the session.
f3ed775e 555 */
38ee087f 556static int _lttng_stop_tracing(const char *session_name, int wait)
f3ed775e 557{
38ee087f 558 int ret, data_ret;
cd80958d
DG
559 struct lttcomm_session_msg lsm;
560
6a4f824d 561 if (session_name == NULL) {
2f70b271 562 return -LTTNG_ERR_INVALID;
6a4f824d
DG
563 }
564
cd80958d 565 lsm.cmd_type = LTTNG_STOP_TRACE;
6a4f824d 566
cac3069d
DG
567 lttng_ctl_copy_string(lsm.session.name, session_name,
568 sizeof(lsm.session.name));
cd80958d 569
cac3069d 570 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
38ee087f
DG
571 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
572 goto error;
573 }
574
575 if (!wait) {
576 goto end;
577 }
578
579 _MSG("Waiting for data availability");
b7a81c24 580 fflush(stdout);
38ee087f
DG
581
582 /* Check for data availability */
583 do {
6d805429 584 data_ret = lttng_data_pending(session_name);
38ee087f
DG
585 if (data_ret < 0) {
586 /* Return the data available call error. */
587 ret = data_ret;
588 goto error;
589 }
590
591 /*
592 * Data sleep time before retrying (in usec). Don't sleep if the call
593 * returned value indicates availability.
594 */
6d805429 595 if (data_ret) {
38ee087f
DG
596 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
597 _MSG(".");
b7a81c24 598 fflush(stdout);
38ee087f 599 }
6d805429 600 } while (data_ret != 0);
38ee087f
DG
601
602 MSG("");
603
604end:
605error:
606 return ret;
607}
608
609/*
610 * Stop tracing and wait for data availability.
611 */
612int lttng_stop_tracing(const char *session_name)
613{
614 return _lttng_stop_tracing(session_name, 1);
615}
616
617/*
618 * Stop tracing but _don't_ wait for data availability.
619 */
620int lttng_stop_tracing_no_wait(const char *session_name)
621{
622 return _lttng_stop_tracing(session_name, 0);
f3ed775e
DG
623}
624
625/*
601d5acf
DG
626 * Add context to a channel.
627 *
628 * If the given channel is NULL, add the contexts to all channels.
629 * The event_name param is ignored.
af87c45a
DG
630 *
631 * Returns the size of the returned payload data or a negative error code.
1df4dedd 632 */
cd80958d 633int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
634 struct lttng_event_context *ctx, const char *event_name,
635 const char *channel_name)
d65106b1 636{
cd80958d
DG
637 struct lttcomm_session_msg lsm;
638
9d697d3d
DG
639 /* Safety check. Both are mandatory */
640 if (handle == NULL || ctx == NULL) {
2f70b271 641 return -LTTNG_ERR_INVALID;
cd80958d
DG
642 }
643
441c16a7
MD
644 memset(&lsm, 0, sizeof(lsm));
645
cd80958d
DG
646 lsm.cmd_type = LTTNG_ADD_CONTEXT;
647
85076754
MD
648 /* If no channel name, send empty string. */
649 if (channel_name == NULL) {
650 lttng_ctl_copy_string(lsm.u.context.channel_name, "",
651 sizeof(lsm.u.context.channel_name));
652 } else {
653 lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name,
654 sizeof(lsm.u.context.channel_name));
655 }
cd80958d 656
cac3069d 657 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d65106b1 658
9d697d3d 659 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
d65106b1 660
cac3069d 661 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
662 sizeof(lsm.session.name));
663
cac3069d 664 return lttng_ctl_ask_sessiond(&lsm, NULL);
d65106b1
DG
665}
666
f3ed775e 667/*
1c8d13c8
TD
668 * Enable event(s) for a channel.
669 * If no event name is specified, all events are enabled.
670 * If no channel name is specified, the default 'channel0' is used.
671 * Returns size of returned session payload data or a negative error code.
f3ed775e 672 */
cd80958d 673int lttng_enable_event(struct lttng_handle *handle,
38057ed1 674 struct lttng_event *ev, const char *channel_name)
1df4dedd 675{
cd80958d
DG
676 struct lttcomm_session_msg lsm;
677
5117eeec 678 if (handle == NULL || ev == NULL) {
2f70b271 679 return -LTTNG_ERR_INVALID;
cd80958d 680 }
33a2b854 681
441c16a7
MD
682 memset(&lsm, 0, sizeof(lsm));
683
85076754 684 /* If no channel name, send empty string. */
94cf3c47 685 if (channel_name == NULL) {
85076754 686 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
cd80958d 687 sizeof(lsm.u.enable.channel_name));
33a2b854 688 } else {
cac3069d 689 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
cd80958d 690 sizeof(lsm.u.enable.channel_name));
eb354453
DG
691 }
692
cac3069d 693 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
0d0c377a 694
8c9ae521 695 if (ev->name[0] != '\0') {
cd80958d 696 lsm.cmd_type = LTTNG_ENABLE_EVENT;
0d0c377a 697 } else {
cd80958d 698 lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
f3ed775e 699 }
8c9ae521 700 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
f3ed775e 701
cac3069d 702 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
703 sizeof(lsm.session.name));
704
cac3069d 705 return lttng_ctl_ask_sessiond(&lsm, NULL);
1df4dedd
DG
706}
707
53a80697 708/*
025faf73 709 * Create or enable an event with a filter expression.
178191b3 710 *
53a80697
MD
711 * Return negative error value on error.
712 * Return size of returned session payload data if OK.
713 */
025faf73 714int lttng_enable_event_with_filter(struct lttng_handle *handle,
178191b3 715 struct lttng_event *event, const char *channel_name,
53a80697
MD
716 const char *filter_expression)
717{
718 struct lttcomm_session_msg lsm;
719 struct filter_parser_ctx *ctx;
720 FILE *fmem;
721 int ret = 0;
722
52df2401
MD
723 if (!filter_expression) {
724 /*
725 * Fall back to normal event enabling if no filter
726 * specified.
727 */
728 return lttng_enable_event(handle, event, channel_name);
729 }
730
731 /*
732 * Empty filter string will always be rejected by the parser
733 * anyway, so treat this corner-case early to eliminate
734 * lttng_fmemopen error for 0-byte allocation.
735 */
736 if (handle == NULL || filter_expression[0] == '\0') {
2f70b271 737 return -LTTNG_ERR_INVALID;
53a80697
MD
738 }
739
53a80697
MD
740 /*
741 * casting const to non-const, as the underlying function will
742 * use it in read-only mode.
743 */
744 fmem = lttng_fmemopen((void *) filter_expression,
745 strlen(filter_expression), "r");
746 if (!fmem) {
747 fprintf(stderr, "Error opening memory as stream\n");
ff7ef7b8 748 return -LTTNG_ERR_FILTER_NOMEM;
53a80697
MD
749 }
750 ctx = filter_parser_ctx_alloc(fmem);
751 if (!ctx) {
752 fprintf(stderr, "Error allocating parser\n");
ff7ef7b8 753 ret = -LTTNG_ERR_FILTER_NOMEM;
53a80697
MD
754 goto alloc_error;
755 }
756 ret = filter_parser_ctx_append_ast(ctx);
757 if (ret) {
758 fprintf(stderr, "Parse error\n");
ff7ef7b8 759 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
760 goto parse_error;
761 }
762 ret = filter_visitor_set_parent(ctx);
763 if (ret) {
764 fprintf(stderr, "Set parent error\n");
ff7ef7b8 765 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
766 goto parse_error;
767 }
768 if (print_xml) {
769 ret = filter_visitor_print_xml(ctx, stdout, 0);
770 if (ret) {
771 fflush(stdout);
772 fprintf(stderr, "XML print error\n");
ff7ef7b8 773 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
774 goto parse_error;
775 }
776 }
777
778 dbg_printf("Generating IR... ");
779 fflush(stdout);
780 ret = filter_visitor_ir_generate(ctx);
781 if (ret) {
782 fprintf(stderr, "Generate IR error\n");
ff7ef7b8 783 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
784 goto parse_error;
785 }
786 dbg_printf("done\n");
787
788 dbg_printf("Validating IR... ");
789 fflush(stdout);
790 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
791 if (ret) {
ff7ef7b8 792 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
793 goto parse_error;
794 }
795 dbg_printf("done\n");
796
797 dbg_printf("Generating bytecode... ");
798 fflush(stdout);
799 ret = filter_visitor_bytecode_generate(ctx);
800 if (ret) {
801 fprintf(stderr, "Generate bytecode error\n");
ff7ef7b8 802 ret = -LTTNG_ERR_FILTER_INVAL;
53a80697
MD
803 goto parse_error;
804 }
805 dbg_printf("done\n");
806 dbg_printf("Size of bytecode generated: %u bytes.\n",
807 bytecode_get_len(&ctx->bytecode->b));
808
809 memset(&lsm, 0, sizeof(lsm));
810
025faf73 811 lsm.cmd_type = LTTNG_ENABLE_EVENT_WITH_FILTER;
53a80697 812
85076754
MD
813 /* If no channel name, send empty string. */
814 if (channel_name == NULL) {
815 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
816 sizeof(lsm.u.enable.channel_name));
817 } else {
818 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
819 sizeof(lsm.u.enable.channel_name));
820 }
821
53a80697 822 /* Copy event name */
178191b3
DG
823 if (event) {
824 memcpy(&lsm.u.enable.event, event, sizeof(lsm.u.enable.event));
825 }
826
025faf73 827 lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
53a80697
MD
828 + bytecode_get_len(&ctx->bytecode->b);
829
cac3069d 830 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
53a80697 831
cac3069d 832 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
53a80697
MD
833 sizeof(lsm.session.name));
834
cac3069d 835 ret = lttng_ctl_ask_sessiond_varlen(&lsm, &ctx->bytecode->b,
025faf73 836 lsm.u.enable.bytecode_len, NULL);
53a80697
MD
837
838 filter_bytecode_free(ctx);
839 filter_ir_free(ctx);
840 filter_parser_ctx_free(ctx);
841 if (fclose(fmem) != 0) {
842 perror("fclose");
843 }
844 return ret;
845
846parse_error:
847 filter_bytecode_free(ctx);
848 filter_ir_free(ctx);
849 filter_parser_ctx_free(ctx);
850alloc_error:
851 if (fclose(fmem) != 0) {
852 perror("fclose");
853 }
854 return ret;
855}
856
1df4dedd 857/*
1c8d13c8
TD
858 * Disable event(s) of a channel and domain.
859 * If no event name is specified, all events are disabled.
860 * If no channel name is specified, the default 'channel0' is used.
861 * Returns size of returned session payload data or a negative error code.
1df4dedd 862 */
cd80958d 863int lttng_disable_event(struct lttng_handle *handle, const char *name,
38057ed1 864 const char *channel_name)
1df4dedd 865{
cd80958d 866 struct lttcomm_session_msg lsm;
1df4dedd 867
9d697d3d 868 if (handle == NULL) {
2f70b271 869 return -LTTNG_ERR_INVALID;
cd80958d
DG
870 }
871
441c16a7
MD
872 memset(&lsm, 0, sizeof(lsm));
873
85076754
MD
874 /* If no channel name, send empty string. */
875 if (channel_name == NULL) {
876 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
cd80958d 877 sizeof(lsm.u.disable.channel_name));
f3ed775e 878 } else {
85076754 879 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
cd80958d 880 sizeof(lsm.u.disable.channel_name));
eb354453
DG
881 }
882
cac3069d 883 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f5177a38 884
f84efadf 885 if (name != NULL) {
cac3069d
DG
886 lttng_ctl_copy_string(lsm.u.disable.name, name,
887 sizeof(lsm.u.disable.name));
cd80958d 888 lsm.cmd_type = LTTNG_DISABLE_EVENT;
f5177a38 889 } else {
cd80958d 890 lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
f3ed775e
DG
891 }
892
cac3069d 893 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
894 sizeof(lsm.session.name));
895
cac3069d 896 return lttng_ctl_ask_sessiond(&lsm, NULL);
1df4dedd
DG
897}
898
899/*
1c8d13c8
TD
900 * Enable channel per domain
901 * Returns size of returned session payload data or a negative error code.
a5c5a2bd 902 */
cd80958d 903int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 904 struct lttng_channel *chan)
a5c5a2bd 905{
cd80958d
DG
906 struct lttcomm_session_msg lsm;
907
5117eeec
DG
908 /*
909 * NULL arguments are forbidden. No default values.
910 */
911 if (handle == NULL || chan == NULL) {
2f70b271 912 return -LTTNG_ERR_INVALID;
cd80958d
DG
913 }
914
441c16a7
MD
915 memset(&lsm, 0, sizeof(lsm));
916
5117eeec 917 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
7d29a247 918
cd80958d
DG
919 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
920
cac3069d 921 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 922
cac3069d 923 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
924 sizeof(lsm.session.name));
925
cac3069d 926 return lttng_ctl_ask_sessiond(&lsm, NULL);
8c0faa1d 927}
1df4dedd 928
2ef84c95 929/*
1c8d13c8
TD
930 * All tracing will be stopped for registered events of the channel.
931 * Returns size of returned session payload data or a negative error code.
2ef84c95 932 */
cd80958d 933int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 934{
cd80958d
DG
935 struct lttcomm_session_msg lsm;
936
9d697d3d
DG
937 /* Safety check. Both are mandatory */
938 if (handle == NULL || name == NULL) {
2f70b271 939 return -LTTNG_ERR_INVALID;
cd80958d
DG
940 }
941
441c16a7
MD
942 memset(&lsm, 0, sizeof(lsm));
943
cd80958d 944 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 945
cac3069d 946 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
9d697d3d
DG
947 sizeof(lsm.u.disable.channel_name));
948
cac3069d 949 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cd80958d 950
cac3069d 951 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
952 sizeof(lsm.session.name));
953
cac3069d 954 return lttng_ctl_ask_sessiond(&lsm, NULL);
ca95a216
DG
955}
956
fac6795d 957/*
1c8d13c8
TD
958 * Lists all available tracepoints of domain.
959 * Sets the contents of the events array.
960 * Returns the number of lttng_event entries in events;
961 * on error, returns a negative value.
fac6795d 962 */
cd80958d 963int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 964 struct lttng_event **events)
fac6795d 965{
052da939 966 int ret;
cd80958d
DG
967 struct lttcomm_session_msg lsm;
968
9d697d3d 969 if (handle == NULL) {
2f70b271 970 return -LTTNG_ERR_INVALID;
cd80958d 971 }
fac6795d 972
cd80958d 973 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
cac3069d 974 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 975
cac3069d 976 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
052da939
DG
977 if (ret < 0) {
978 return ret;
eb354453 979 }
fac6795d 980
9f19cc17 981 return ret / sizeof(struct lttng_event);
fac6795d
DG
982}
983
f37d259d
MD
984/*
985 * Lists all available tracepoint fields of domain.
986 * Sets the contents of the event field array.
987 * Returns the number of lttng_event_field entries in events;
988 * on error, returns a negative value.
989 */
990int lttng_list_tracepoint_fields(struct lttng_handle *handle,
991 struct lttng_event_field **fields)
992{
993 int ret;
994 struct lttcomm_session_msg lsm;
995
996 if (handle == NULL) {
2f70b271 997 return -LTTNG_ERR_INVALID;
f37d259d
MD
998 }
999
1000 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
cac3069d 1001 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f37d259d 1002
cac3069d 1003 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
f37d259d
MD
1004 if (ret < 0) {
1005 return ret;
1006 }
1007
1008 return ret / sizeof(struct lttng_event_field);
1009}
1010
1657e9bb 1011/*
1c8d13c8
TD
1012 * Returns a human readable string describing
1013 * the error code (a negative value).
1657e9bb 1014 */
9a745bc7 1015const char *lttng_strerror(int code)
1657e9bb 1016{
f73fabfd 1017 return error_get_str(code);
1657e9bb
DG
1018}
1019
aaf97519 1020/*
a4b92340
DG
1021 * Create a brand new session using name and url for destination.
1022 *
f73fabfd 1023 * Returns LTTNG_OK on success or a negative error code.
00e2e675 1024 */
a4b92340 1025int lttng_create_session(const char *name, const char *url)
00e2e675 1026{
3dd05a85 1027 int ret;
a4b92340 1028 ssize_t size;
00e2e675 1029 struct lttcomm_session_msg lsm;
a4b92340 1030 struct lttng_uri *uris = NULL;
00e2e675 1031
a4b92340 1032 if (name == NULL) {
2f70b271 1033 return -LTTNG_ERR_INVALID;
00e2e675
DG
1034 }
1035
a4b92340 1036 memset(&lsm, 0, sizeof(lsm));
00e2e675 1037
a4b92340 1038 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1039 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
a4b92340
DG
1040
1041 /* There should never be a data URL */
bc894455 1042 size = uri_parse_str_urls(url, NULL, &uris);
a4b92340 1043 if (size < 0) {
2f70b271 1044 return -LTTNG_ERR_INVALID;
00e2e675
DG
1045 }
1046
a4b92340
DG
1047 lsm.u.uri.size = size;
1048
cac3069d
DG
1049 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1050 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1051
1052 free(uris);
1053 return ret;
00e2e675
DG
1054}
1055
8028d920 1056/*
8028d920 1057 * Destroy session using name.
1c8d13c8 1058 * Returns size of returned session payload data or a negative error code.
8028d920 1059 */
843f5df9 1060int lttng_destroy_session(const char *session_name)
8028d920 1061{
cd80958d
DG
1062 struct lttcomm_session_msg lsm;
1063
843f5df9 1064 if (session_name == NULL) {
2f70b271 1065 return -LTTNG_ERR_INVALID;
cd80958d
DG
1066 }
1067
1068 lsm.cmd_type = LTTNG_DESTROY_SESSION;
843f5df9 1069
cac3069d
DG
1070 lttng_ctl_copy_string(lsm.session.name, session_name,
1071 sizeof(lsm.session.name));
cd80958d 1072
cac3069d 1073 return lttng_ctl_ask_sessiond(&lsm, NULL);
aaf97519
DG
1074}
1075
57167058 1076/*
57167058 1077 * Ask the session daemon for all available sessions.
1c8d13c8
TD
1078 * Sets the contents of the sessions array.
1079 * Returns the number of lttng_session entries in sessions;
1080 * on error, returns a negative value.
57167058 1081 */
ca95a216 1082int lttng_list_sessions(struct lttng_session **sessions)
57167058 1083{
ca95a216 1084 int ret;
cd80958d 1085 struct lttcomm_session_msg lsm;
57167058 1086
cd80958d 1087 lsm.cmd_type = LTTNG_LIST_SESSIONS;
cac3069d 1088 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
57167058 1089 if (ret < 0) {
ca95a216 1090 return ret;
57167058
DG
1091 }
1092
ca95a216 1093 return ret / sizeof(struct lttng_session);
57167058
DG
1094}
1095
9f19cc17 1096/*
1c8d13c8
TD
1097 * Ask the session daemon for all available domains of a session.
1098 * Sets the contents of the domains array.
1099 * Returns the number of lttng_domain entries in domains;
1100 * on error, returns a negative value.
9f19cc17 1101 */
330be774 1102int lttng_list_domains(const char *session_name,
cd80958d 1103 struct lttng_domain **domains)
9f19cc17
DG
1104{
1105 int ret;
cd80958d
DG
1106 struct lttcomm_session_msg lsm;
1107
330be774 1108 if (session_name == NULL) {
2f70b271 1109 return -LTTNG_ERR_INVALID;
cd80958d 1110 }
9f19cc17 1111
cd80958d
DG
1112 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1113
cac3069d
DG
1114 lttng_ctl_copy_string(lsm.session.name, session_name,
1115 sizeof(lsm.session.name));
cd80958d 1116
cac3069d 1117 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
9f19cc17
DG
1118 if (ret < 0) {
1119 return ret;
1120 }
1121
1122 return ret / sizeof(struct lttng_domain);
1123}
1124
1125/*
1c8d13c8
TD
1126 * Ask the session daemon for all available channels of a session.
1127 * Sets the contents of the channels array.
1128 * Returns the number of lttng_channel entries in channels;
1129 * on error, returns a negative value.
9f19cc17 1130 */
cd80958d
DG
1131int lttng_list_channels(struct lttng_handle *handle,
1132 struct lttng_channel **channels)
9f19cc17
DG
1133{
1134 int ret;
cd80958d
DG
1135 struct lttcomm_session_msg lsm;
1136
9d697d3d 1137 if (handle == NULL) {
2f70b271 1138 return -LTTNG_ERR_INVALID;
cd80958d
DG
1139 }
1140
1141 lsm.cmd_type = LTTNG_LIST_CHANNELS;
cac3069d 1142 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1143 sizeof(lsm.session.name));
9f19cc17 1144
cac3069d 1145 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1146
cac3069d 1147 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
9f19cc17
DG
1148 if (ret < 0) {
1149 return ret;
1150 }
1151
1152 return ret / sizeof(struct lttng_channel);
1153}
1154
1155/*
1c8d13c8
TD
1156 * Ask the session daemon for all available events of a session channel.
1157 * Sets the contents of the events array.
1158 * Returns the number of lttng_event entries in events;
1159 * on error, returns a negative value.
9f19cc17 1160 */
cd80958d
DG
1161int lttng_list_events(struct lttng_handle *handle,
1162 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
1163{
1164 int ret;
cd80958d 1165 struct lttcomm_session_msg lsm;
9f19cc17 1166
9d697d3d
DG
1167 /* Safety check. An handle and channel name are mandatory */
1168 if (handle == NULL || channel_name == NULL) {
2f70b271 1169 return -LTTNG_ERR_INVALID;
cd80958d
DG
1170 }
1171
1172 lsm.cmd_type = LTTNG_LIST_EVENTS;
cac3069d 1173 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1174 sizeof(lsm.session.name));
cac3069d 1175 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
cd80958d
DG
1176 sizeof(lsm.u.list.channel_name));
1177
cac3069d 1178 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1179
cac3069d 1180 ret = lttng_ctl_ask_sessiond(&lsm, (void**) events);
9f19cc17
DG
1181 if (ret < 0) {
1182 return ret;
1183 }
1184
1185 return ret / sizeof(struct lttng_event);
1186}
1187
fac6795d 1188/*
1c8d13c8
TD
1189 * Sets the tracing_group variable with name.
1190 * This function allocates memory pointed to by tracing_group.
1191 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
fac6795d
DG
1192 */
1193int lttng_set_tracing_group(const char *name)
1194{
9d697d3d 1195 if (name == NULL) {
2f70b271 1196 return -LTTNG_ERR_INVALID;
9d697d3d
DG
1197 }
1198
fac6795d 1199 if (asprintf(&tracing_group, "%s", name) < 0) {
2f70b271 1200 return -LTTNG_ERR_FATAL;
fac6795d
DG
1201 }
1202
1203 return 0;
1204}
1205
d0254c7c 1206/*
af87c45a 1207 * Returns size of returned session payload data or a negative error code.
d0254c7c 1208 */
cd80958d 1209int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
1210 struct lttng_calibrate *calibrate)
1211{
cd80958d 1212 struct lttcomm_session_msg lsm;
d0254c7c 1213
9d697d3d
DG
1214 /* Safety check. NULL pointer are forbidden */
1215 if (handle == NULL || calibrate == NULL) {
2f70b271 1216 return -LTTNG_ERR_INVALID;
cd80958d 1217 }
d0254c7c 1218
cd80958d 1219 lsm.cmd_type = LTTNG_CALIBRATE;
cac3069d 1220 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d0254c7c 1221
cd80958d
DG
1222 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
1223
cac3069d 1224 return lttng_ctl_ask_sessiond(&lsm, NULL);
d0254c7c
MD
1225}
1226
5edd7e09
DG
1227/*
1228 * Set default channel attributes.
441c16a7 1229 * If either or both of the arguments are null, attr content is zeroe'd.
5edd7e09
DG
1230 */
1231void lttng_channel_set_default_attr(struct lttng_domain *domain,
1232 struct lttng_channel_attr *attr)
1233{
1234 /* Safety check */
1235 if (attr == NULL || domain == NULL) {
1236 return;
1237 }
1238
eacaa7a6
DS
1239 memset(attr, 0, sizeof(struct lttng_channel_attr));
1240
0a9c6494
DG
1241 /* Same for all domains. */
1242 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
1243 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
1244 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
1245
5edd7e09
DG
1246 switch (domain->type) {
1247 case LTTNG_DOMAIN_KERNEL:
d92ff3ef
DG
1248 attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
1249 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
3e230f92 1250 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
5edd7e09
DG
1251 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
1252 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1253 break;
1254 case LTTNG_DOMAIN_UST:
0a9c6494
DG
1255 switch (domain->buf_type) {
1256 case LTTNG_BUFFER_PER_UID:
1257 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
1258 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
1259 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
1260 attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
1261 attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER;
1262 break;
1263 case LTTNG_BUFFER_PER_PID:
1264 default:
1265 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
1266 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
1267 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
1268 attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
1269 attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER;
1270 break;
1271 }
5edd7e09 1272 default:
441c16a7 1273 /* Default behavior: leave set to 0. */
5edd7e09
DG
1274 break;
1275 }
1276}
1277
fac6795d 1278/*
2269e89e 1279 * Check if session daemon is alive.
fac6795d 1280 *
2269e89e 1281 * Return 1 if alive or 0 if not.
1c8d13c8 1282 * On error returns a negative value.
fac6795d 1283 */
947308c4 1284int lttng_session_daemon_alive(void)
fac6795d
DG
1285{
1286 int ret;
1287
1288 ret = set_session_daemon_path();
1289 if (ret < 0) {
947308c4 1290 /* Error */
fac6795d
DG
1291 return ret;
1292 }
1293
9d035200 1294 if (*sessiond_sock_path == '\0') {
2f70b271
DG
1295 /*
1296 * No socket path set. Weird error which means the constructor was not
1297 * called.
1298 */
1299 assert(0);
fac6795d
DG
1300 }
1301
2269e89e 1302 ret = try_connect_sessiond(sessiond_sock_path);
7d8234d9
MD
1303 if (ret < 0) {
1304 /* Not alive */
1305 return 0;
1306 }
7d8234d9 1307
947308c4
DG
1308 /* Is alive */
1309 return 1;
fac6795d
DG
1310}
1311
00e2e675 1312/*
a4b92340 1313 * Set URL for a consumer for a session and domain.
00e2e675
DG
1314 *
1315 * Return 0 on success, else a negative value.
1316 */
a4b92340
DG
1317int lttng_set_consumer_url(struct lttng_handle *handle,
1318 const char *control_url, const char *data_url)
00e2e675 1319{
3dd05a85 1320 int ret;
a4b92340 1321 ssize_t size;
00e2e675 1322 struct lttcomm_session_msg lsm;
a4b92340 1323 struct lttng_uri *uris = NULL;
00e2e675 1324
a4b92340 1325 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
2f70b271 1326 return -LTTNG_ERR_INVALID;
00e2e675
DG
1327 }
1328
a4b92340
DG
1329 memset(&lsm, 0, sizeof(lsm));
1330
00e2e675
DG
1331 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
1332
cac3069d 1333 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
00e2e675 1334 sizeof(lsm.session.name));
cac3069d 1335 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
00e2e675 1336
bc894455 1337 size = uri_parse_str_urls(control_url, data_url, &uris);
a4b92340 1338 if (size < 0) {
2f70b271 1339 return -LTTNG_ERR_INVALID;
a4b92340
DG
1340 }
1341
1342 lsm.u.uri.size = size;
00e2e675 1343
cac3069d
DG
1344 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1345 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1346
1347 free(uris);
1348 return ret;
00e2e675
DG
1349}
1350
1351/*
9c6bda17 1352 * [OBSOLETE]
00e2e675
DG
1353 */
1354int lttng_enable_consumer(struct lttng_handle *handle)
1355{
785d2d0d 1356 return -ENOSYS;
00e2e675
DG
1357}
1358
1359/*
9c6bda17 1360 * [OBSOLETE]
00e2e675
DG
1361 */
1362int lttng_disable_consumer(struct lttng_handle *handle)
1363{
785d2d0d 1364 return -ENOSYS;
00e2e675
DG
1365}
1366
07424f16
DG
1367/*
1368 * This is an extension of create session that is ONLY and SHOULD only be used
1369 * by the lttng command line program. It exists to avoid using URI parsing in
1370 * the lttng client.
1371 *
1372 * We need the date and time for the trace path subdirectory for the case where
1373 * the user does NOT define one using either -o or -U. Using the normal
1374 * lttng_create_session API call, we have no clue on the session daemon side if
1375 * the URL was generated automatically by the client or define by the user.
1376 *
1377 * So this function "wrapper" is hidden from the public API, takes the datetime
1378 * string and appends it if necessary to the URI subdirectory before sending it
1379 * to the session daemon.
1380 *
1381 * With this extra function, the lttng_create_session call behavior is not
1382 * changed and the timestamp is appended to the URI on the session daemon side
1383 * if necessary.
1384 */
1385int _lttng_create_session_ext(const char *name, const char *url,
1386 const char *datetime)
1387{
3dd05a85 1388 int ret;
07424f16
DG
1389 ssize_t size;
1390 struct lttcomm_session_msg lsm;
1391 struct lttng_uri *uris = NULL;
1392
2bba9e53 1393 if (name == NULL || datetime == NULL) {
2f70b271 1394 return -LTTNG_ERR_INVALID;
07424f16
DG
1395 }
1396
1397 memset(&lsm, 0, sizeof(lsm));
1398
1399 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1400 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
07424f16
DG
1401
1402 /* There should never be a data URL */
bc894455 1403 size = uri_parse_str_urls(url, NULL, &uris);
07424f16 1404 if (size < 0) {
3dd05a85
DG
1405 ret = -LTTNG_ERR_INVALID;
1406 goto error;
07424f16
DG
1407 }
1408
1409 lsm.u.uri.size = size;
1410
4b35a6b3 1411 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
da4aa2b8
DG
1412 /* Don't append datetime if the name was automatically created. */
1413 if (strncmp(name, DEFAULT_SESSION_NAME "-",
1414 strlen(DEFAULT_SESSION_NAME) + 1)) {
1415 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
1416 name, datetime);
1417 } else {
1418 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
1419 }
07424f16
DG
1420 if (ret < 0) {
1421 PERROR("snprintf uri subdir");
3dd05a85
DG
1422 ret = -LTTNG_ERR_FATAL;
1423 goto error;
07424f16
DG
1424 }
1425 }
1426
cac3069d
DG
1427 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1428 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1429
1430error:
1431 free(uris);
1432 return ret;
07424f16
DG
1433}
1434
806e2684
DG
1435/*
1436 * For a given session name, this call checks if the data is ready to be read
1437 * or is still being extracted by the consumer(s) hence not ready to be used by
1438 * any readers.
1439 */
6d805429 1440int lttng_data_pending(const char *session_name)
806e2684
DG
1441{
1442 int ret;
1443 struct lttcomm_session_msg lsm;
1444
1445 if (session_name == NULL) {
1446 return -LTTNG_ERR_INVALID;
1447 }
1448
6d805429 1449 lsm.cmd_type = LTTNG_DATA_PENDING;
806e2684 1450
cac3069d
DG
1451 lttng_ctl_copy_string(lsm.session.name, session_name,
1452 sizeof(lsm.session.name));
806e2684 1453
cac3069d 1454 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
806e2684
DG
1455
1456 /*
cac3069d
DG
1457 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1458 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1459 * that the data is available. Yes it is hackish but for now this is the
1460 * only way.
806e2684
DG
1461 */
1462 if (ret == -1) {
1463 ret = 1;
1464 }
1465
1466 return ret;
1467}
1468
27babd3a
DG
1469/*
1470 * Create a session exclusively used for snapshot.
1471 *
1472 * Returns LTTNG_OK on success or a negative error code.
1473 */
1474int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
1475{
1476 int ret;
1477 ssize_t size;
1478 struct lttcomm_session_msg lsm;
1479 struct lttng_uri *uris = NULL;
1480
1481 if (name == NULL) {
1482 return -LTTNG_ERR_INVALID;
1483 }
1484
1485 memset(&lsm, 0, sizeof(lsm));
1486
1487 lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
1488 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1489
1490 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
1491 if (size < 0) {
1492 return -LTTNG_ERR_INVALID;
1493 }
1494
1495 lsm.u.uri.size = size;
1496
1497 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1498 sizeof(struct lttng_uri) * size, NULL);
1499
1500 free(uris);
1501 return ret;
1502}
1503
ecc48a90
JD
1504/*
1505 * Create a session exclusively used for live.
1506 *
1507 * Returns LTTNG_OK on success or a negative error code.
1508 */
1509int lttng_create_session_live(const char *name, const char *url,
1510 unsigned int timer_interval)
1511{
1512 int ret;
1513 ssize_t size;
1514 struct lttcomm_session_msg lsm;
1515 struct lttng_uri *uris = NULL;
1516
1517 if (name == NULL) {
1518 return -LTTNG_ERR_INVALID;
1519 }
1520
1521 memset(&lsm, 0, sizeof(lsm));
1522
1523 lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE;
1524 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1525
1526 size = uri_parse_str_urls(url, NULL, &uris);
1527 if (size < 0) {
1528 ret = -LTTNG_ERR_INVALID;
1529 goto end;
1530 }
1531
1532 /* file:// is not accepted for live session. */
1533 if (uris[0].dtype == LTTNG_DST_PATH) {
1534 ret = -LTTNG_ERR_INVALID;
1535 goto end;
1536 }
1537
1538 lsm.u.session_live.nb_uri = size;
1539 lsm.u.session_live.timer_interval = timer_interval;
1540
1541 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1542 sizeof(struct lttng_uri) * size, NULL);
1543
1544end:
1545 free(uris);
1546 return ret;
1547}
1548
fac6795d
DG
1549/*
1550 * lib constructor
1551 */
1552static void __attribute__((constructor)) init()
1553{
1554 /* Set default session group */
bbccc3d2 1555 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
fac6795d 1556}
49cca668
DG
1557
1558/*
1559 * lib destructor
1560 */
1561static void __attribute__((destructor)) lttng_ctl_exit()
1562{
1563 free(tracing_group);
1564}
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