Fix: missing valid return code when adding an URI to consumer
[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
53efb85a 523 memset(&lsm, 0, sizeof(lsm));
d9800920 524 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
cac3069d 525 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
d9800920 526 sizeof(lsm.session.name));
cac3069d 527 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d9800920 528
cac3069d 529 lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
d9800920 530
cac3069d 531 return lttng_ctl_ask_sessiond(&lsm, NULL);
d9800920
DG
532}
533
1df4dedd 534/*
1c8d13c8
TD
535 * Start tracing for all traces of the session.
536 * Returns size of returned session payload data or a negative error code.
1df4dedd 537 */
6a4f824d 538int lttng_start_tracing(const char *session_name)
f3ed775e 539{
cd80958d
DG
540 struct lttcomm_session_msg lsm;
541
6a4f824d 542 if (session_name == NULL) {
2f70b271 543 return -LTTNG_ERR_INVALID;
cd80958d
DG
544 }
545
53efb85a 546 memset(&lsm, 0, sizeof(lsm));
cd80958d 547 lsm.cmd_type = LTTNG_START_TRACE;
6a4f824d 548
cac3069d
DG
549 lttng_ctl_copy_string(lsm.session.name, session_name,
550 sizeof(lsm.session.name));
cd80958d 551
cac3069d 552 return lttng_ctl_ask_sessiond(&lsm, NULL);
f3ed775e 553}
1df4dedd
DG
554
555/*
38ee087f 556 * Stop tracing for all traces of the session.
f3ed775e 557 */
38ee087f 558static int _lttng_stop_tracing(const char *session_name, int wait)
f3ed775e 559{
38ee087f 560 int ret, data_ret;
cd80958d
DG
561 struct lttcomm_session_msg lsm;
562
6a4f824d 563 if (session_name == NULL) {
2f70b271 564 return -LTTNG_ERR_INVALID;
6a4f824d
DG
565 }
566
53efb85a 567 memset(&lsm, 0, sizeof(lsm));
cd80958d 568 lsm.cmd_type = LTTNG_STOP_TRACE;
6a4f824d 569
cac3069d
DG
570 lttng_ctl_copy_string(lsm.session.name, session_name,
571 sizeof(lsm.session.name));
cd80958d 572
cac3069d 573 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
38ee087f
DG
574 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
575 goto error;
576 }
577
578 if (!wait) {
579 goto end;
580 }
581
582 _MSG("Waiting for data availability");
b7a81c24 583 fflush(stdout);
38ee087f
DG
584
585 /* Check for data availability */
586 do {
6d805429 587 data_ret = lttng_data_pending(session_name);
38ee087f
DG
588 if (data_ret < 0) {
589 /* Return the data available call error. */
590 ret = data_ret;
591 goto error;
592 }
593
594 /*
595 * Data sleep time before retrying (in usec). Don't sleep if the call
596 * returned value indicates availability.
597 */
6d805429 598 if (data_ret) {
38ee087f
DG
599 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
600 _MSG(".");
b7a81c24 601 fflush(stdout);
38ee087f 602 }
6d805429 603 } while (data_ret != 0);
38ee087f
DG
604
605 MSG("");
606
607end:
608error:
609 return ret;
610}
611
612/*
613 * Stop tracing and wait for data availability.
614 */
615int lttng_stop_tracing(const char *session_name)
616{
617 return _lttng_stop_tracing(session_name, 1);
618}
619
620/*
621 * Stop tracing but _don't_ wait for data availability.
622 */
623int lttng_stop_tracing_no_wait(const char *session_name)
624{
625 return _lttng_stop_tracing(session_name, 0);
f3ed775e
DG
626}
627
628/*
601d5acf
DG
629 * Add context to a channel.
630 *
631 * If the given channel is NULL, add the contexts to all channels.
632 * The event_name param is ignored.
af87c45a
DG
633 *
634 * Returns the size of the returned payload data or a negative error code.
1df4dedd 635 */
cd80958d 636int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
637 struct lttng_event_context *ctx, const char *event_name,
638 const char *channel_name)
d65106b1 639{
cd80958d
DG
640 struct lttcomm_session_msg lsm;
641
9d697d3d
DG
642 /* Safety check. Both are mandatory */
643 if (handle == NULL || ctx == NULL) {
2f70b271 644 return -LTTNG_ERR_INVALID;
cd80958d
DG
645 }
646
441c16a7
MD
647 memset(&lsm, 0, sizeof(lsm));
648
cd80958d
DG
649 lsm.cmd_type = LTTNG_ADD_CONTEXT;
650
85076754
MD
651 /* If no channel name, send empty string. */
652 if (channel_name == NULL) {
653 lttng_ctl_copy_string(lsm.u.context.channel_name, "",
654 sizeof(lsm.u.context.channel_name));
655 } else {
656 lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name,
657 sizeof(lsm.u.context.channel_name));
658 }
cd80958d 659
cac3069d 660 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d65106b1 661
9d697d3d 662 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
d65106b1 663
cac3069d 664 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
665 sizeof(lsm.session.name));
666
cac3069d 667 return lttng_ctl_ask_sessiond(&lsm, NULL);
d65106b1
DG
668}
669
f3ed775e 670/*
1c8d13c8
TD
671 * Enable event(s) for a channel.
672 * If no event name is specified, all events are enabled.
673 * If no channel name is specified, the default 'channel0' is used.
674 * Returns size of returned session payload data or a negative error code.
f3ed775e 675 */
cd80958d 676int lttng_enable_event(struct lttng_handle *handle,
38057ed1 677 struct lttng_event *ev, const char *channel_name)
1df4dedd 678{
f8a96544
JI
679 return lttng_enable_event_with_exclusions(handle, ev, channel_name,
680 NULL, 0, NULL);
1df4dedd
DG
681}
682
53a80697 683/*
025faf73 684 * Create or enable an event with a filter expression.
178191b3 685 *
53a80697
MD
686 * Return negative error value on error.
687 * Return size of returned session payload data if OK.
688 */
025faf73 689int lttng_enable_event_with_filter(struct lttng_handle *handle,
178191b3 690 struct lttng_event *event, const char *channel_name,
53a80697
MD
691 const char *filter_expression)
692{
f8a96544
JI
693 return lttng_enable_event_with_exclusions(handle, event, channel_name,
694 filter_expression, 0, NULL);
53a80697
MD
695}
696
93deb080
JI
697/*
698 * Enable event(s) for a channel, possibly with exclusions and a filter.
699 * If no event name is specified, all events are enabled.
700 * If no channel name is specified, the default name is used.
701 * If filter expression is not NULL, the filter is set for the event.
702 * If exclusion count is not zero, the exclusions are set for the event.
703 * Returns size of returned session payload data or a negative error code.
704 */
705int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
706 struct lttng_event *ev, const char *channel_name,
707 const char *filter_expression,
708 int exclusion_count, char **exclusion_list)
709{
710 struct lttcomm_session_msg lsm;
711 char *varlen_data;
712 int ret = 0;
713 struct filter_parser_ctx *ctx = NULL;
714 FILE *fmem = NULL;
715
716 if (handle == NULL || ev == NULL) {
717 return -LTTNG_ERR_INVALID;
718 }
719
720 /* Empty filter string will always be rejected by the parser
721 * anyway, so treat this corner-case early to eliminate
722 * lttng_fmemopen error for 0-byte allocation.
723 */
724 if (filter_expression && filter_expression[0] == '\0') {
725 return -LTTNG_ERR_INVALID;
726 }
727
728 memset(&lsm, 0, sizeof(lsm));
729
730 /* If no channel name, send empty string. */
731 if (channel_name == NULL) {
732 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
733 sizeof(lsm.u.enable.channel_name));
734 } else {
735 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
736 sizeof(lsm.u.enable.channel_name));
737 }
738
6565421f
DG
739 if (ev->name[0] != '\0') {
740 lsm.cmd_type = LTTNG_ENABLE_EVENT;
741 } else {
742 lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
743 }
93deb080 744
6565421f 745 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
93deb080
JI
746 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
747
748 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
749 sizeof(lsm.session.name));
750 lsm.u.enable.exclusion_count = exclusion_count;
751 lsm.u.enable.bytecode_len = 0;
752
753 if (exclusion_count == 0 && filter_expression == NULL) {
754 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
755 return ret;
756 }
757
758 /*
759 * We have either a filter or some exclusions, so we need to set up
760 * a variable-length memory block from where to send the data
761 */
762
763 /* Parse filter expression */
764 if (filter_expression != NULL) {
765
766 /*
767 * casting const to non-const, as the underlying function will
768 * use it in read-only mode.
769 */
770 fmem = lttng_fmemopen((void *) filter_expression,
771 strlen(filter_expression), "r");
772 if (!fmem) {
773 fprintf(stderr, "Error opening memory as stream\n");
774 return -LTTNG_ERR_FILTER_NOMEM;
775 }
776 ctx = filter_parser_ctx_alloc(fmem);
777 if (!ctx) {
778 fprintf(stderr, "Error allocating parser\n");
779 ret = -LTTNG_ERR_FILTER_NOMEM;
780 goto filter_alloc_error;
781 }
782 ret = filter_parser_ctx_append_ast(ctx);
783 if (ret) {
784 fprintf(stderr, "Parse error\n");
785 ret = -LTTNG_ERR_FILTER_INVAL;
786 goto parse_error;
787 }
788 ret = filter_visitor_set_parent(ctx);
789 if (ret) {
790 fprintf(stderr, "Set parent error\n");
791 ret = -LTTNG_ERR_FILTER_INVAL;
792 goto parse_error;
793 }
794 if (print_xml) {
795 ret = filter_visitor_print_xml(ctx, stdout, 0);
796 if (ret) {
797 fflush(stdout);
798 fprintf(stderr, "XML print error\n");
799 ret = -LTTNG_ERR_FILTER_INVAL;
800 goto parse_error;
801 }
802 }
803
804 dbg_printf("Generating IR... ");
805 fflush(stdout);
806 ret = filter_visitor_ir_generate(ctx);
807 if (ret) {
808 fprintf(stderr, "Generate IR error\n");
809 ret = -LTTNG_ERR_FILTER_INVAL;
810 goto parse_error;
811 }
812 dbg_printf("done\n");
813
814 dbg_printf("Validating IR... ");
815 fflush(stdout);
816 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
817 if (ret) {
818 ret = -LTTNG_ERR_FILTER_INVAL;
819 goto parse_error;
820 }
821 dbg_printf("done\n");
822
823 dbg_printf("Generating bytecode... ");
824 fflush(stdout);
825 ret = filter_visitor_bytecode_generate(ctx);
826 if (ret) {
827 fprintf(stderr, "Generate bytecode error\n");
828 ret = -LTTNG_ERR_FILTER_INVAL;
829 goto parse_error;
830 }
831 dbg_printf("done\n");
832 dbg_printf("Size of bytecode generated: %u bytes.\n",
833 bytecode_get_len(&ctx->bytecode->b));
834
835 lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
836 + bytecode_get_len(&ctx->bytecode->b);
6b453b5e
JG
837 lsm.u.enable.expression_len = strlen(filter_expression) + 1;
838 }
839
840 varlen_data = zmalloc(lsm.u.enable.bytecode_len
841 + lsm.u.enable.expression_len
842 + LTTNG_SYMBOL_NAME_LEN * exclusion_count);
843 if (!varlen_data) {
844 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
845 goto varlen_alloc_error;
846 }
847 /* Put exclusion names first in the data */
848 while (exclusion_count--) {
849 strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count,
850 *(exclusion_list + exclusion_count),
851 LTTNG_SYMBOL_NAME_LEN);
852 }
853 /* Add filter expression next */
854 if (lsm.u.enable.expression_len != 0) {
855 memcpy(varlen_data
856 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count,
857 filter_expression,
858 lsm.u.enable.expression_len);
859 }
860 /* Add filter bytecode next */
861 if (lsm.u.enable.bytecode_len != 0) {
862 memcpy(varlen_data
863 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count
864 + lsm.u.enable.expression_len,
865 &ctx->bytecode->b,
866 lsm.u.enable.bytecode_len);
93deb080
JI
867 }
868
869 ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data,
67676bd8 870 (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) +
6b453b5e
JG
871 lsm.u.enable.bytecode_len + lsm.u.enable.expression_len,
872 NULL);
873 free(varlen_data);
93deb080
JI
874
875varlen_alloc_error:
876 if (filter_expression) {
877 filter_bytecode_free(ctx);
878 filter_ir_free(ctx);
879 filter_parser_ctx_free(ctx);
880 if (fclose(fmem) != 0) {
881 perror("fclose");
882 }
883 }
884 return ret;
885
886parse_error:
887 filter_bytecode_free(ctx);
888 filter_ir_free(ctx);
889 filter_parser_ctx_free(ctx);
890filter_alloc_error:
891 if (fclose(fmem) != 0) {
892 perror("fclose");
893 }
894 return ret;
895}
896
1df4dedd 897/*
1c8d13c8
TD
898 * Disable event(s) of a channel and domain.
899 * If no event name is specified, all events are disabled.
900 * If no channel name is specified, the default 'channel0' is used.
901 * Returns size of returned session payload data or a negative error code.
1df4dedd 902 */
cd80958d 903int lttng_disable_event(struct lttng_handle *handle, const char *name,
38057ed1 904 const char *channel_name)
1df4dedd 905{
cd80958d 906 struct lttcomm_session_msg lsm;
1df4dedd 907
9d697d3d 908 if (handle == NULL) {
2f70b271 909 return -LTTNG_ERR_INVALID;
cd80958d
DG
910 }
911
441c16a7
MD
912 memset(&lsm, 0, sizeof(lsm));
913
85076754
MD
914 /* If no channel name, send empty string. */
915 if (channel_name == NULL) {
916 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
cd80958d 917 sizeof(lsm.u.disable.channel_name));
f3ed775e 918 } else {
85076754 919 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
cd80958d 920 sizeof(lsm.u.disable.channel_name));
eb354453
DG
921 }
922
cac3069d 923 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f5177a38 924
f84efadf 925 if (name != NULL) {
cac3069d
DG
926 lttng_ctl_copy_string(lsm.u.disable.name, name,
927 sizeof(lsm.u.disable.name));
cd80958d 928 lsm.cmd_type = LTTNG_DISABLE_EVENT;
f5177a38 929 } else {
cd80958d 930 lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
f3ed775e
DG
931 }
932
cac3069d 933 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
934 sizeof(lsm.session.name));
935
cac3069d 936 return lttng_ctl_ask_sessiond(&lsm, NULL);
1df4dedd
DG
937}
938
939/*
1c8d13c8
TD
940 * Enable channel per domain
941 * Returns size of returned session payload data or a negative error code.
a5c5a2bd 942 */
cd80958d 943int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 944 struct lttng_channel *chan)
a5c5a2bd 945{
cd80958d
DG
946 struct lttcomm_session_msg lsm;
947
5117eeec
DG
948 /*
949 * NULL arguments are forbidden. No default values.
950 */
951 if (handle == NULL || chan == NULL) {
2f70b271 952 return -LTTNG_ERR_INVALID;
cd80958d
DG
953 }
954
441c16a7
MD
955 memset(&lsm, 0, sizeof(lsm));
956
5117eeec 957 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
7d29a247 958
cd80958d
DG
959 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
960
cac3069d 961 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 962
cac3069d 963 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
964 sizeof(lsm.session.name));
965
cac3069d 966 return lttng_ctl_ask_sessiond(&lsm, NULL);
8c0faa1d 967}
1df4dedd 968
2ef84c95 969/*
1c8d13c8
TD
970 * All tracing will be stopped for registered events of the channel.
971 * Returns size of returned session payload data or a negative error code.
2ef84c95 972 */
cd80958d 973int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 974{
cd80958d
DG
975 struct lttcomm_session_msg lsm;
976
9d697d3d
DG
977 /* Safety check. Both are mandatory */
978 if (handle == NULL || name == NULL) {
2f70b271 979 return -LTTNG_ERR_INVALID;
cd80958d
DG
980 }
981
441c16a7
MD
982 memset(&lsm, 0, sizeof(lsm));
983
cd80958d 984 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 985
cac3069d 986 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
9d697d3d
DG
987 sizeof(lsm.u.disable.channel_name));
988
cac3069d 989 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cd80958d 990
cac3069d 991 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
992 sizeof(lsm.session.name));
993
cac3069d 994 return lttng_ctl_ask_sessiond(&lsm, NULL);
ca95a216
DG
995}
996
fac6795d 997/*
1c8d13c8
TD
998 * Lists all available tracepoints of domain.
999 * Sets the contents of the events array.
1000 * Returns the number of lttng_event entries in events;
1001 * on error, returns a negative value.
fac6795d 1002 */
cd80958d 1003int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 1004 struct lttng_event **events)
fac6795d 1005{
052da939 1006 int ret;
cd80958d
DG
1007 struct lttcomm_session_msg lsm;
1008
9d697d3d 1009 if (handle == NULL) {
2f70b271 1010 return -LTTNG_ERR_INVALID;
cd80958d 1011 }
fac6795d 1012
53efb85a 1013 memset(&lsm, 0, sizeof(lsm));
cd80958d 1014 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
cac3069d 1015 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 1016
cac3069d 1017 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
052da939
DG
1018 if (ret < 0) {
1019 return ret;
eb354453 1020 }
fac6795d 1021
9f19cc17 1022 return ret / sizeof(struct lttng_event);
fac6795d
DG
1023}
1024
f37d259d
MD
1025/*
1026 * Lists all available tracepoint fields of domain.
1027 * Sets the contents of the event field array.
1028 * Returns the number of lttng_event_field entries in events;
1029 * on error, returns a negative value.
1030 */
1031int lttng_list_tracepoint_fields(struct lttng_handle *handle,
1032 struct lttng_event_field **fields)
1033{
1034 int ret;
1035 struct lttcomm_session_msg lsm;
1036
1037 if (handle == NULL) {
2f70b271 1038 return -LTTNG_ERR_INVALID;
f37d259d
MD
1039 }
1040
53efb85a 1041 memset(&lsm, 0, sizeof(lsm));
f37d259d 1042 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
cac3069d 1043 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f37d259d 1044
cac3069d 1045 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
f37d259d
MD
1046 if (ret < 0) {
1047 return ret;
1048 }
1049
1050 return ret / sizeof(struct lttng_event_field);
1051}
1052
1657e9bb 1053/*
1c8d13c8
TD
1054 * Returns a human readable string describing
1055 * the error code (a negative value).
1657e9bb 1056 */
9a745bc7 1057const char *lttng_strerror(int code)
1657e9bb 1058{
f73fabfd 1059 return error_get_str(code);
1657e9bb
DG
1060}
1061
aaf97519 1062/*
a4b92340
DG
1063 * Create a brand new session using name and url for destination.
1064 *
f73fabfd 1065 * Returns LTTNG_OK on success or a negative error code.
00e2e675 1066 */
a4b92340 1067int lttng_create_session(const char *name, const char *url)
00e2e675 1068{
3dd05a85 1069 int ret;
a4b92340 1070 ssize_t size;
00e2e675 1071 struct lttcomm_session_msg lsm;
a4b92340 1072 struct lttng_uri *uris = NULL;
00e2e675 1073
a4b92340 1074 if (name == NULL) {
2f70b271 1075 return -LTTNG_ERR_INVALID;
00e2e675
DG
1076 }
1077
a4b92340 1078 memset(&lsm, 0, sizeof(lsm));
00e2e675 1079
a4b92340 1080 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1081 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
a4b92340
DG
1082
1083 /* There should never be a data URL */
bc894455 1084 size = uri_parse_str_urls(url, NULL, &uris);
a4b92340 1085 if (size < 0) {
2f70b271 1086 return -LTTNG_ERR_INVALID;
00e2e675
DG
1087 }
1088
a4b92340
DG
1089 lsm.u.uri.size = size;
1090
cac3069d
DG
1091 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1092 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1093
1094 free(uris);
1095 return ret;
00e2e675
DG
1096}
1097
8028d920 1098/*
8028d920 1099 * Destroy session using name.
1c8d13c8 1100 * Returns size of returned session payload data or a negative error code.
8028d920 1101 */
843f5df9 1102int lttng_destroy_session(const char *session_name)
8028d920 1103{
cd80958d
DG
1104 struct lttcomm_session_msg lsm;
1105
843f5df9 1106 if (session_name == NULL) {
2f70b271 1107 return -LTTNG_ERR_INVALID;
cd80958d
DG
1108 }
1109
53efb85a 1110 memset(&lsm, 0, sizeof(lsm));
cd80958d 1111 lsm.cmd_type = LTTNG_DESTROY_SESSION;
843f5df9 1112
cac3069d
DG
1113 lttng_ctl_copy_string(lsm.session.name, session_name,
1114 sizeof(lsm.session.name));
cd80958d 1115
cac3069d 1116 return lttng_ctl_ask_sessiond(&lsm, NULL);
aaf97519
DG
1117}
1118
57167058 1119/*
57167058 1120 * Ask the session daemon for all available sessions.
1c8d13c8
TD
1121 * Sets the contents of the sessions array.
1122 * Returns the number of lttng_session entries in sessions;
1123 * on error, returns a negative value.
57167058 1124 */
ca95a216 1125int lttng_list_sessions(struct lttng_session **sessions)
57167058 1126{
ca95a216 1127 int ret;
cd80958d 1128 struct lttcomm_session_msg lsm;
57167058 1129
53efb85a 1130 memset(&lsm, 0, sizeof(lsm));
cd80958d 1131 lsm.cmd_type = LTTNG_LIST_SESSIONS;
cac3069d 1132 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
57167058 1133 if (ret < 0) {
ca95a216 1134 return ret;
57167058
DG
1135 }
1136
ca95a216 1137 return ret / sizeof(struct lttng_session);
57167058
DG
1138}
1139
9f19cc17 1140/*
1c8d13c8
TD
1141 * Ask the session daemon for all available domains of a session.
1142 * Sets the contents of the domains array.
1143 * Returns the number of lttng_domain entries in domains;
1144 * on error, returns a negative value.
9f19cc17 1145 */
330be774 1146int lttng_list_domains(const char *session_name,
cd80958d 1147 struct lttng_domain **domains)
9f19cc17
DG
1148{
1149 int ret;
cd80958d
DG
1150 struct lttcomm_session_msg lsm;
1151
330be774 1152 if (session_name == NULL) {
2f70b271 1153 return -LTTNG_ERR_INVALID;
cd80958d 1154 }
9f19cc17 1155
53efb85a 1156 memset(&lsm, 0, sizeof(lsm));
cd80958d
DG
1157 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1158
cac3069d
DG
1159 lttng_ctl_copy_string(lsm.session.name, session_name,
1160 sizeof(lsm.session.name));
cd80958d 1161
cac3069d 1162 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
9f19cc17
DG
1163 if (ret < 0) {
1164 return ret;
1165 }
1166
1167 return ret / sizeof(struct lttng_domain);
1168}
1169
1170/*
1c8d13c8
TD
1171 * Ask the session daemon for all available channels of a session.
1172 * Sets the contents of the channels array.
1173 * Returns the number of lttng_channel entries in channels;
1174 * on error, returns a negative value.
9f19cc17 1175 */
cd80958d
DG
1176int lttng_list_channels(struct lttng_handle *handle,
1177 struct lttng_channel **channels)
9f19cc17
DG
1178{
1179 int ret;
cd80958d
DG
1180 struct lttcomm_session_msg lsm;
1181
9d697d3d 1182 if (handle == NULL) {
2f70b271 1183 return -LTTNG_ERR_INVALID;
cd80958d
DG
1184 }
1185
53efb85a 1186 memset(&lsm, 0, sizeof(lsm));
cd80958d 1187 lsm.cmd_type = LTTNG_LIST_CHANNELS;
cac3069d 1188 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1189 sizeof(lsm.session.name));
9f19cc17 1190
cac3069d 1191 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1192
cac3069d 1193 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
9f19cc17
DG
1194 if (ret < 0) {
1195 return ret;
1196 }
1197
1198 return ret / sizeof(struct lttng_channel);
1199}
1200
1201/*
1c8d13c8
TD
1202 * Ask the session daemon for all available events of a session channel.
1203 * Sets the contents of the events array.
1204 * Returns the number of lttng_event entries in events;
1205 * on error, returns a negative value.
9f19cc17 1206 */
cd80958d
DG
1207int lttng_list_events(struct lttng_handle *handle,
1208 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
1209{
1210 int ret;
cd80958d 1211 struct lttcomm_session_msg lsm;
9f19cc17 1212
9d697d3d
DG
1213 /* Safety check. An handle and channel name are mandatory */
1214 if (handle == NULL || channel_name == NULL) {
2f70b271 1215 return -LTTNG_ERR_INVALID;
cd80958d
DG
1216 }
1217
53efb85a 1218 memset(&lsm, 0, sizeof(lsm));
cd80958d 1219 lsm.cmd_type = LTTNG_LIST_EVENTS;
cac3069d 1220 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1221 sizeof(lsm.session.name));
cac3069d 1222 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
cd80958d
DG
1223 sizeof(lsm.u.list.channel_name));
1224
cac3069d 1225 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1226
cac3069d 1227 ret = lttng_ctl_ask_sessiond(&lsm, (void**) events);
9f19cc17
DG
1228 if (ret < 0) {
1229 return ret;
1230 }
1231
1232 return ret / sizeof(struct lttng_event);
1233}
1234
fac6795d 1235/*
1c8d13c8
TD
1236 * Sets the tracing_group variable with name.
1237 * This function allocates memory pointed to by tracing_group.
1238 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
fac6795d
DG
1239 */
1240int lttng_set_tracing_group(const char *name)
1241{
9d697d3d 1242 if (name == NULL) {
2f70b271 1243 return -LTTNG_ERR_INVALID;
9d697d3d
DG
1244 }
1245
fac6795d 1246 if (asprintf(&tracing_group, "%s", name) < 0) {
2f70b271 1247 return -LTTNG_ERR_FATAL;
fac6795d
DG
1248 }
1249
1250 return 0;
1251}
1252
d0254c7c 1253/*
af87c45a 1254 * Returns size of returned session payload data or a negative error code.
d0254c7c 1255 */
cd80958d 1256int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
1257 struct lttng_calibrate *calibrate)
1258{
cd80958d 1259 struct lttcomm_session_msg lsm;
d0254c7c 1260
9d697d3d
DG
1261 /* Safety check. NULL pointer are forbidden */
1262 if (handle == NULL || calibrate == NULL) {
2f70b271 1263 return -LTTNG_ERR_INVALID;
cd80958d 1264 }
d0254c7c 1265
53efb85a 1266 memset(&lsm, 0, sizeof(lsm));
cd80958d 1267 lsm.cmd_type = LTTNG_CALIBRATE;
cac3069d 1268 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d0254c7c 1269
cd80958d
DG
1270 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
1271
cac3069d 1272 return lttng_ctl_ask_sessiond(&lsm, NULL);
d0254c7c
MD
1273}
1274
5edd7e09
DG
1275/*
1276 * Set default channel attributes.
441c16a7 1277 * If either or both of the arguments are null, attr content is zeroe'd.
5edd7e09
DG
1278 */
1279void lttng_channel_set_default_attr(struct lttng_domain *domain,
1280 struct lttng_channel_attr *attr)
1281{
1282 /* Safety check */
1283 if (attr == NULL || domain == NULL) {
1284 return;
1285 }
1286
eacaa7a6
DS
1287 memset(attr, 0, sizeof(struct lttng_channel_attr));
1288
0a9c6494
DG
1289 /* Same for all domains. */
1290 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
1291 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
1292 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
1293
5edd7e09
DG
1294 switch (domain->type) {
1295 case LTTNG_DOMAIN_KERNEL:
d92ff3ef
DG
1296 attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
1297 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
3e230f92 1298 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
5edd7e09
DG
1299 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
1300 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1301 break;
1302 case LTTNG_DOMAIN_UST:
0a9c6494
DG
1303 switch (domain->buf_type) {
1304 case LTTNG_BUFFER_PER_UID:
1305 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
1306 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
1307 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
1308 attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
1309 attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER;
1310 break;
1311 case LTTNG_BUFFER_PER_PID:
1312 default:
1313 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
1314 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
1315 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
1316 attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
1317 attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER;
1318 break;
1319 }
5edd7e09 1320 default:
441c16a7 1321 /* Default behavior: leave set to 0. */
5edd7e09
DG
1322 break;
1323 }
1324}
1325
fac6795d 1326/*
2269e89e 1327 * Check if session daemon is alive.
fac6795d 1328 *
2269e89e 1329 * Return 1 if alive or 0 if not.
1c8d13c8 1330 * On error returns a negative value.
fac6795d 1331 */
947308c4 1332int lttng_session_daemon_alive(void)
fac6795d
DG
1333{
1334 int ret;
1335
1336 ret = set_session_daemon_path();
1337 if (ret < 0) {
947308c4 1338 /* Error */
fac6795d
DG
1339 return ret;
1340 }
1341
9d035200 1342 if (*sessiond_sock_path == '\0') {
2f70b271
DG
1343 /*
1344 * No socket path set. Weird error which means the constructor was not
1345 * called.
1346 */
1347 assert(0);
fac6795d
DG
1348 }
1349
2269e89e 1350 ret = try_connect_sessiond(sessiond_sock_path);
7d8234d9
MD
1351 if (ret < 0) {
1352 /* Not alive */
1353 return 0;
1354 }
7d8234d9 1355
947308c4
DG
1356 /* Is alive */
1357 return 1;
fac6795d
DG
1358}
1359
00e2e675 1360/*
a4b92340 1361 * Set URL for a consumer for a session and domain.
00e2e675
DG
1362 *
1363 * Return 0 on success, else a negative value.
1364 */
a4b92340
DG
1365int lttng_set_consumer_url(struct lttng_handle *handle,
1366 const char *control_url, const char *data_url)
00e2e675 1367{
3dd05a85 1368 int ret;
a4b92340 1369 ssize_t size;
00e2e675 1370 struct lttcomm_session_msg lsm;
a4b92340 1371 struct lttng_uri *uris = NULL;
00e2e675 1372
a4b92340 1373 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
2f70b271 1374 return -LTTNG_ERR_INVALID;
00e2e675
DG
1375 }
1376
a4b92340
DG
1377 memset(&lsm, 0, sizeof(lsm));
1378
00e2e675
DG
1379 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
1380
cac3069d 1381 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
00e2e675 1382 sizeof(lsm.session.name));
cac3069d 1383 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
00e2e675 1384
bc894455 1385 size = uri_parse_str_urls(control_url, data_url, &uris);
a4b92340 1386 if (size < 0) {
2f70b271 1387 return -LTTNG_ERR_INVALID;
a4b92340
DG
1388 }
1389
1390 lsm.u.uri.size = size;
00e2e675 1391
cac3069d
DG
1392 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1393 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1394
1395 free(uris);
1396 return ret;
00e2e675
DG
1397}
1398
1399/*
9c6bda17 1400 * [OBSOLETE]
00e2e675
DG
1401 */
1402int lttng_enable_consumer(struct lttng_handle *handle)
1403{
785d2d0d 1404 return -ENOSYS;
00e2e675
DG
1405}
1406
1407/*
9c6bda17 1408 * [OBSOLETE]
00e2e675
DG
1409 */
1410int lttng_disable_consumer(struct lttng_handle *handle)
1411{
785d2d0d 1412 return -ENOSYS;
00e2e675
DG
1413}
1414
07424f16
DG
1415/*
1416 * This is an extension of create session that is ONLY and SHOULD only be used
1417 * by the lttng command line program. It exists to avoid using URI parsing in
1418 * the lttng client.
1419 *
1420 * We need the date and time for the trace path subdirectory for the case where
1421 * the user does NOT define one using either -o or -U. Using the normal
1422 * lttng_create_session API call, we have no clue on the session daemon side if
1423 * the URL was generated automatically by the client or define by the user.
1424 *
1425 * So this function "wrapper" is hidden from the public API, takes the datetime
1426 * string and appends it if necessary to the URI subdirectory before sending it
1427 * to the session daemon.
1428 *
1429 * With this extra function, the lttng_create_session call behavior is not
1430 * changed and the timestamp is appended to the URI on the session daemon side
1431 * if necessary.
1432 */
1433int _lttng_create_session_ext(const char *name, const char *url,
1434 const char *datetime)
1435{
3dd05a85 1436 int ret;
07424f16
DG
1437 ssize_t size;
1438 struct lttcomm_session_msg lsm;
1439 struct lttng_uri *uris = NULL;
1440
2bba9e53 1441 if (name == NULL || datetime == NULL) {
2f70b271 1442 return -LTTNG_ERR_INVALID;
07424f16
DG
1443 }
1444
1445 memset(&lsm, 0, sizeof(lsm));
1446
1447 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1448 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
07424f16
DG
1449
1450 /* There should never be a data URL */
bc894455 1451 size = uri_parse_str_urls(url, NULL, &uris);
07424f16 1452 if (size < 0) {
3dd05a85
DG
1453 ret = -LTTNG_ERR_INVALID;
1454 goto error;
07424f16
DG
1455 }
1456
1457 lsm.u.uri.size = size;
1458
4b35a6b3 1459 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
da4aa2b8
DG
1460 /* Don't append datetime if the name was automatically created. */
1461 if (strncmp(name, DEFAULT_SESSION_NAME "-",
1462 strlen(DEFAULT_SESSION_NAME) + 1)) {
1463 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
1464 name, datetime);
1465 } else {
1466 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
1467 }
07424f16
DG
1468 if (ret < 0) {
1469 PERROR("snprintf uri subdir");
3dd05a85
DG
1470 ret = -LTTNG_ERR_FATAL;
1471 goto error;
07424f16
DG
1472 }
1473 }
1474
cac3069d
DG
1475 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1476 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1477
1478error:
1479 free(uris);
1480 return ret;
07424f16
DG
1481}
1482
806e2684
DG
1483/*
1484 * For a given session name, this call checks if the data is ready to be read
1485 * or is still being extracted by the consumer(s) hence not ready to be used by
1486 * any readers.
1487 */
6d805429 1488int lttng_data_pending(const char *session_name)
806e2684
DG
1489{
1490 int ret;
1491 struct lttcomm_session_msg lsm;
1492
1493 if (session_name == NULL) {
1494 return -LTTNG_ERR_INVALID;
1495 }
1496
53efb85a 1497 memset(&lsm, 0, sizeof(lsm));
6d805429 1498 lsm.cmd_type = LTTNG_DATA_PENDING;
806e2684 1499
cac3069d
DG
1500 lttng_ctl_copy_string(lsm.session.name, session_name,
1501 sizeof(lsm.session.name));
806e2684 1502
cac3069d 1503 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
806e2684
DG
1504
1505 /*
cac3069d
DG
1506 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1507 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1508 * that the data is available. Yes it is hackish but for now this is the
1509 * only way.
806e2684
DG
1510 */
1511 if (ret == -1) {
1512 ret = 1;
1513 }
1514
1515 return ret;
1516}
1517
27babd3a
DG
1518/*
1519 * Create a session exclusively used for snapshot.
1520 *
1521 * Returns LTTNG_OK on success or a negative error code.
1522 */
1523int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
1524{
1525 int ret;
1526 ssize_t size;
1527 struct lttcomm_session_msg lsm;
1528 struct lttng_uri *uris = NULL;
1529
1530 if (name == NULL) {
1531 return -LTTNG_ERR_INVALID;
1532 }
1533
1534 memset(&lsm, 0, sizeof(lsm));
1535
1536 lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
1537 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1538
1539 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
1540 if (size < 0) {
1541 return -LTTNG_ERR_INVALID;
1542 }
1543
1544 lsm.u.uri.size = size;
1545
1546 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1547 sizeof(struct lttng_uri) * size, NULL);
1548
1549 free(uris);
1550 return ret;
1551}
1552
ecc48a90
JD
1553/*
1554 * Create a session exclusively used for live.
1555 *
1556 * Returns LTTNG_OK on success or a negative error code.
1557 */
1558int lttng_create_session_live(const char *name, const char *url,
1559 unsigned int timer_interval)
1560{
1561 int ret;
1562 ssize_t size;
1563 struct lttcomm_session_msg lsm;
1564 struct lttng_uri *uris = NULL;
1565
1566 if (name == NULL) {
1567 return -LTTNG_ERR_INVALID;
1568 }
1569
1570 memset(&lsm, 0, sizeof(lsm));
1571
1572 lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE;
1573 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1574
1575 size = uri_parse_str_urls(url, NULL, &uris);
903055ea 1576 if (size <= 0) {
ecc48a90
JD
1577 ret = -LTTNG_ERR_INVALID;
1578 goto end;
1579 }
1580
1581 /* file:// is not accepted for live session. */
1582 if (uris[0].dtype == LTTNG_DST_PATH) {
1583 ret = -LTTNG_ERR_INVALID;
1584 goto end;
1585 }
1586
1587 lsm.u.session_live.nb_uri = size;
1588 lsm.u.session_live.timer_interval = timer_interval;
1589
1590 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1591 sizeof(struct lttng_uri) * size, NULL);
1592
1593end:
1594 free(uris);
1595 return ret;
1596}
1597
fac6795d
DG
1598/*
1599 * lib constructor
1600 */
1601static void __attribute__((constructor)) init()
1602{
1603 /* Set default session group */
bbccc3d2 1604 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
fac6795d 1605}
49cca668
DG
1606
1607/*
1608 * lib destructor
1609 */
1610static void __attribute__((destructor)) lttng_ctl_exit()
1611{
1612 free(tracing_group);
1613}
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