Fix: JUL filtering done on the UST level
[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
38ee087f
DG
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 596 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
38ee087f 597 }
6d805429 598 } while (data_ret != 0);
38ee087f 599
38ee087f
DG
600end:
601error:
602 return ret;
603}
604
605/*
606 * Stop tracing and wait for data availability.
607 */
608int lttng_stop_tracing(const char *session_name)
609{
610 return _lttng_stop_tracing(session_name, 1);
611}
612
613/*
614 * Stop tracing but _don't_ wait for data availability.
615 */
616int lttng_stop_tracing_no_wait(const char *session_name)
617{
618 return _lttng_stop_tracing(session_name, 0);
f3ed775e
DG
619}
620
621/*
601d5acf
DG
622 * Add context to a channel.
623 *
624 * If the given channel is NULL, add the contexts to all channels.
625 * The event_name param is ignored.
af87c45a
DG
626 *
627 * Returns the size of the returned payload data or a negative error code.
1df4dedd 628 */
cd80958d 629int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
630 struct lttng_event_context *ctx, const char *event_name,
631 const char *channel_name)
d65106b1 632{
cd80958d
DG
633 struct lttcomm_session_msg lsm;
634
9d697d3d
DG
635 /* Safety check. Both are mandatory */
636 if (handle == NULL || ctx == NULL) {
2f70b271 637 return -LTTNG_ERR_INVALID;
cd80958d
DG
638 }
639
441c16a7
MD
640 memset(&lsm, 0, sizeof(lsm));
641
cd80958d
DG
642 lsm.cmd_type = LTTNG_ADD_CONTEXT;
643
85076754
MD
644 /* If no channel name, send empty string. */
645 if (channel_name == NULL) {
646 lttng_ctl_copy_string(lsm.u.context.channel_name, "",
647 sizeof(lsm.u.context.channel_name));
648 } else {
649 lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name,
650 sizeof(lsm.u.context.channel_name));
651 }
cd80958d 652
cac3069d 653 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d65106b1 654
9d697d3d 655 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
d65106b1 656
cac3069d 657 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
658 sizeof(lsm.session.name));
659
cac3069d 660 return lttng_ctl_ask_sessiond(&lsm, NULL);
d65106b1
DG
661}
662
f3ed775e 663/*
1c8d13c8
TD
664 * Enable event(s) for a channel.
665 * If no event name is specified, all events are enabled.
666 * If no channel name is specified, the default 'channel0' is used.
667 * Returns size of returned session payload data or a negative error code.
f3ed775e 668 */
cd80958d 669int lttng_enable_event(struct lttng_handle *handle,
38057ed1 670 struct lttng_event *ev, const char *channel_name)
1df4dedd 671{
f8a96544
JI
672 return lttng_enable_event_with_exclusions(handle, ev, channel_name,
673 NULL, 0, NULL);
1df4dedd
DG
674}
675
53a80697 676/*
025faf73 677 * Create or enable an event with a filter expression.
178191b3 678 *
53a80697
MD
679 * Return negative error value on error.
680 * Return size of returned session payload data if OK.
681 */
025faf73 682int lttng_enable_event_with_filter(struct lttng_handle *handle,
178191b3 683 struct lttng_event *event, const char *channel_name,
53a80697
MD
684 const char *filter_expression)
685{
f8a96544
JI
686 return lttng_enable_event_with_exclusions(handle, event, channel_name,
687 filter_expression, 0, NULL);
53a80697
MD
688}
689
93deb080
JI
690/*
691 * Enable event(s) for a channel, possibly with exclusions and a filter.
692 * If no event name is specified, all events are enabled.
693 * If no channel name is specified, the default name is used.
694 * If filter expression is not NULL, the filter is set for the event.
695 * If exclusion count is not zero, the exclusions are set for the event.
696 * Returns size of returned session payload data or a negative error code.
697 */
698int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
699 struct lttng_event *ev, const char *channel_name,
700 const char *filter_expression,
701 int exclusion_count, char **exclusion_list)
702{
703 struct lttcomm_session_msg lsm;
9b21e6d5 704 char *varlen_data, *jul_filter = NULL;
93deb080
JI
705 int ret = 0;
706 struct filter_parser_ctx *ctx = NULL;
707 FILE *fmem = NULL;
708
709 if (handle == NULL || ev == NULL) {
710 return -LTTNG_ERR_INVALID;
711 }
712
713 /* Empty filter string will always be rejected by the parser
714 * anyway, so treat this corner-case early to eliminate
715 * lttng_fmemopen error for 0-byte allocation.
716 */
717 if (filter_expression && filter_expression[0] == '\0') {
718 return -LTTNG_ERR_INVALID;
719 }
720
721 memset(&lsm, 0, sizeof(lsm));
722
723 /* If no channel name, send empty string. */
724 if (channel_name == NULL) {
725 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
726 sizeof(lsm.u.enable.channel_name));
727 } else {
728 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
729 sizeof(lsm.u.enable.channel_name));
730 }
731
6565421f
DG
732 if (ev->name[0] != '\0') {
733 lsm.cmd_type = LTTNG_ENABLE_EVENT;
734 } else {
735 lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
736 }
93deb080 737
6565421f 738 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
93deb080
JI
739 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
740
741 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
742 sizeof(lsm.session.name));
743 lsm.u.enable.exclusion_count = exclusion_count;
744 lsm.u.enable.bytecode_len = 0;
745
9b21e6d5
DG
746 /*
747 * For the JUL domain, a filter is enforced except for the enable all
748 * event. This is done to avoid having the event in all sessions thus
749 * filtering by logger name.
750 */
751 if (exclusion_count == 0 && filter_expression == NULL &&
3e1c9ff7
DG
752 handle->domain.type != LTTNG_DOMAIN_JUL) {
753 goto ask_sessiond;
93deb080
JI
754 }
755
756 /*
757 * We have either a filter or some exclusions, so we need to set up
758 * a variable-length memory block from where to send the data
759 */
760
761 /* Parse filter expression */
3e1c9ff7 762 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL) {
9b21e6d5
DG
763 if (handle->domain.type == LTTNG_DOMAIN_JUL) {
764 int err;
765
3e1c9ff7
DG
766 if (ev->name[0] != '*') {
767 if (filter_expression) {
768 err = asprintf(&jul_filter, "%s && logger_name == \"%s\"",
769 filter_expression, ev->name);
770 } else {
771 err = asprintf(&jul_filter, "logger_name == \"%s\"",
772 ev->name);
773 }
774 if (err < 0) {
775 PERROR("asprintf");
776 return -LTTNG_ERR_NOMEM;
777 }
778 filter_expression = jul_filter;
9b21e6d5 779 }
3e1c9ff7
DG
780
781 /* Add loglevel filtering if any for the JUL domain. */
782 if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) {
783 char *op;
784
785 if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) {
786 op = ">=";
787 } else {
788 op = "==";
789 }
790
791 if (filter_expression) {
792 err = asprintf(&jul_filter, "%s && int_loglevel %s %d",
793 filter_expression, op, ev->loglevel);
794 } else {
795 err = asprintf(&jul_filter, "int_loglevel %s %d", op,
796 ev->loglevel);
797 }
798 if (err < 0) {
799 PERROR("asprintf");
800 return -LTTNG_ERR_NOMEM;
801 }
802 filter_expression = jul_filter;
803 }
804
805 if (!filter_expression) {
806 goto ask_sessiond;
9b21e6d5 807 }
9b21e6d5 808 }
93deb080
JI
809
810 /*
811 * casting const to non-const, as the underlying function will
812 * use it in read-only mode.
813 */
814 fmem = lttng_fmemopen((void *) filter_expression,
815 strlen(filter_expression), "r");
816 if (!fmem) {
817 fprintf(stderr, "Error opening memory as stream\n");
9b21e6d5 818 free(jul_filter);
93deb080
JI
819 return -LTTNG_ERR_FILTER_NOMEM;
820 }
821 ctx = filter_parser_ctx_alloc(fmem);
822 if (!ctx) {
823 fprintf(stderr, "Error allocating parser\n");
824 ret = -LTTNG_ERR_FILTER_NOMEM;
825 goto filter_alloc_error;
826 }
827 ret = filter_parser_ctx_append_ast(ctx);
828 if (ret) {
829 fprintf(stderr, "Parse error\n");
830 ret = -LTTNG_ERR_FILTER_INVAL;
831 goto parse_error;
832 }
833 ret = filter_visitor_set_parent(ctx);
834 if (ret) {
835 fprintf(stderr, "Set parent error\n");
836 ret = -LTTNG_ERR_FILTER_INVAL;
837 goto parse_error;
838 }
839 if (print_xml) {
840 ret = filter_visitor_print_xml(ctx, stdout, 0);
841 if (ret) {
842 fflush(stdout);
843 fprintf(stderr, "XML print error\n");
844 ret = -LTTNG_ERR_FILTER_INVAL;
845 goto parse_error;
846 }
847 }
848
849 dbg_printf("Generating IR... ");
850 fflush(stdout);
851 ret = filter_visitor_ir_generate(ctx);
852 if (ret) {
853 fprintf(stderr, "Generate IR error\n");
854 ret = -LTTNG_ERR_FILTER_INVAL;
855 goto parse_error;
856 }
857 dbg_printf("done\n");
858
859 dbg_printf("Validating IR... ");
860 fflush(stdout);
861 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
862 if (ret) {
863 ret = -LTTNG_ERR_FILTER_INVAL;
864 goto parse_error;
865 }
866 dbg_printf("done\n");
867
868 dbg_printf("Generating bytecode... ");
869 fflush(stdout);
870 ret = filter_visitor_bytecode_generate(ctx);
871 if (ret) {
872 fprintf(stderr, "Generate bytecode error\n");
873 ret = -LTTNG_ERR_FILTER_INVAL;
874 goto parse_error;
875 }
876 dbg_printf("done\n");
877 dbg_printf("Size of bytecode generated: %u bytes.\n",
878 bytecode_get_len(&ctx->bytecode->b));
879
880 lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
881 + bytecode_get_len(&ctx->bytecode->b);
6b453b5e
JG
882 lsm.u.enable.expression_len = strlen(filter_expression) + 1;
883 }
884
885 varlen_data = zmalloc(lsm.u.enable.bytecode_len
886 + lsm.u.enable.expression_len
887 + LTTNG_SYMBOL_NAME_LEN * exclusion_count);
888 if (!varlen_data) {
889 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
890 goto varlen_alloc_error;
891 }
892 /* Put exclusion names first in the data */
893 while (exclusion_count--) {
894 strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count,
895 *(exclusion_list + exclusion_count),
896 LTTNG_SYMBOL_NAME_LEN);
897 }
898 /* Add filter expression next */
899 if (lsm.u.enable.expression_len != 0) {
900 memcpy(varlen_data
901 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count,
902 filter_expression,
903 lsm.u.enable.expression_len);
904 }
905 /* Add filter bytecode next */
906 if (lsm.u.enable.bytecode_len != 0) {
907 memcpy(varlen_data
908 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count
909 + lsm.u.enable.expression_len,
910 &ctx->bytecode->b,
911 lsm.u.enable.bytecode_len);
93deb080
JI
912 }
913
914 ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data,
67676bd8 915 (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) +
6b453b5e
JG
916 lsm.u.enable.bytecode_len + lsm.u.enable.expression_len,
917 NULL);
918 free(varlen_data);
93deb080
JI
919
920varlen_alloc_error:
921 if (filter_expression) {
922 filter_bytecode_free(ctx);
923 filter_ir_free(ctx);
924 filter_parser_ctx_free(ctx);
925 if (fclose(fmem) != 0) {
926 perror("fclose");
927 }
928 }
9b21e6d5 929 free(jul_filter);
93deb080
JI
930 return ret;
931
932parse_error:
933 filter_bytecode_free(ctx);
934 filter_ir_free(ctx);
935 filter_parser_ctx_free(ctx);
936filter_alloc_error:
937 if (fclose(fmem) != 0) {
938 perror("fclose");
939 }
9b21e6d5 940 free(jul_filter);
93deb080 941 return ret;
3e1c9ff7
DG
942
943ask_sessiond:
944 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
945 return ret;
93deb080
JI
946}
947
1df4dedd 948/*
1c8d13c8
TD
949 * Disable event(s) of a channel and domain.
950 * If no event name is specified, all events are disabled.
951 * If no channel name is specified, the default 'channel0' is used.
952 * Returns size of returned session payload data or a negative error code.
1df4dedd 953 */
cd80958d 954int lttng_disable_event(struct lttng_handle *handle, const char *name,
38057ed1 955 const char *channel_name)
1df4dedd 956{
cd80958d 957 struct lttcomm_session_msg lsm;
1df4dedd 958
9d697d3d 959 if (handle == NULL) {
2f70b271 960 return -LTTNG_ERR_INVALID;
cd80958d
DG
961 }
962
441c16a7
MD
963 memset(&lsm, 0, sizeof(lsm));
964
85076754
MD
965 /* If no channel name, send empty string. */
966 if (channel_name == NULL) {
967 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
cd80958d 968 sizeof(lsm.u.disable.channel_name));
f3ed775e 969 } else {
85076754 970 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
cd80958d 971 sizeof(lsm.u.disable.channel_name));
eb354453
DG
972 }
973
cac3069d 974 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f5177a38 975
f84efadf 976 if (name != NULL) {
cac3069d
DG
977 lttng_ctl_copy_string(lsm.u.disable.name, name,
978 sizeof(lsm.u.disable.name));
cd80958d 979 lsm.cmd_type = LTTNG_DISABLE_EVENT;
f5177a38 980 } else {
cd80958d 981 lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
f3ed775e
DG
982 }
983
cac3069d 984 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
985 sizeof(lsm.session.name));
986
cac3069d 987 return lttng_ctl_ask_sessiond(&lsm, NULL);
1df4dedd
DG
988}
989
990/*
1c8d13c8
TD
991 * Enable channel per domain
992 * Returns size of returned session payload data or a negative error code.
a5c5a2bd 993 */
cd80958d 994int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 995 struct lttng_channel *chan)
a5c5a2bd 996{
cd80958d
DG
997 struct lttcomm_session_msg lsm;
998
5117eeec
DG
999 /*
1000 * NULL arguments are forbidden. No default values.
1001 */
1002 if (handle == NULL || chan == NULL) {
2f70b271 1003 return -LTTNG_ERR_INVALID;
cd80958d
DG
1004 }
1005
441c16a7
MD
1006 memset(&lsm, 0, sizeof(lsm));
1007
5117eeec 1008 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
7d29a247 1009
cd80958d
DG
1010 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
1011
cac3069d 1012 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 1013
cac3069d 1014 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1015 sizeof(lsm.session.name));
1016
cac3069d 1017 return lttng_ctl_ask_sessiond(&lsm, NULL);
8c0faa1d 1018}
1df4dedd 1019
2ef84c95 1020/*
1c8d13c8
TD
1021 * All tracing will be stopped for registered events of the channel.
1022 * Returns size of returned session payload data or a negative error code.
2ef84c95 1023 */
cd80958d 1024int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 1025{
cd80958d
DG
1026 struct lttcomm_session_msg lsm;
1027
9d697d3d
DG
1028 /* Safety check. Both are mandatory */
1029 if (handle == NULL || name == NULL) {
2f70b271 1030 return -LTTNG_ERR_INVALID;
cd80958d
DG
1031 }
1032
441c16a7
MD
1033 memset(&lsm, 0, sizeof(lsm));
1034
cd80958d 1035 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 1036
cac3069d 1037 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
9d697d3d
DG
1038 sizeof(lsm.u.disable.channel_name));
1039
cac3069d 1040 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cd80958d 1041
cac3069d 1042 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1043 sizeof(lsm.session.name));
1044
cac3069d 1045 return lttng_ctl_ask_sessiond(&lsm, NULL);
ca95a216
DG
1046}
1047
fac6795d 1048/*
1c8d13c8
TD
1049 * Lists all available tracepoints of domain.
1050 * Sets the contents of the events array.
1051 * Returns the number of lttng_event entries in events;
1052 * on error, returns a negative value.
fac6795d 1053 */
cd80958d 1054int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 1055 struct lttng_event **events)
fac6795d 1056{
052da939 1057 int ret;
cd80958d
DG
1058 struct lttcomm_session_msg lsm;
1059
9d697d3d 1060 if (handle == NULL) {
2f70b271 1061 return -LTTNG_ERR_INVALID;
cd80958d 1062 }
fac6795d 1063
53efb85a 1064 memset(&lsm, 0, sizeof(lsm));
cd80958d 1065 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
cac3069d 1066 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 1067
cac3069d 1068 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
052da939
DG
1069 if (ret < 0) {
1070 return ret;
eb354453 1071 }
fac6795d 1072
9f19cc17 1073 return ret / sizeof(struct lttng_event);
fac6795d
DG
1074}
1075
f37d259d
MD
1076/*
1077 * Lists all available tracepoint fields of domain.
1078 * Sets the contents of the event field array.
1079 * Returns the number of lttng_event_field entries in events;
1080 * on error, returns a negative value.
1081 */
1082int lttng_list_tracepoint_fields(struct lttng_handle *handle,
1083 struct lttng_event_field **fields)
1084{
1085 int ret;
1086 struct lttcomm_session_msg lsm;
1087
1088 if (handle == NULL) {
2f70b271 1089 return -LTTNG_ERR_INVALID;
f37d259d
MD
1090 }
1091
53efb85a 1092 memset(&lsm, 0, sizeof(lsm));
f37d259d 1093 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
cac3069d 1094 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f37d259d 1095
cac3069d 1096 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
f37d259d
MD
1097 if (ret < 0) {
1098 return ret;
1099 }
1100
1101 return ret / sizeof(struct lttng_event_field);
1102}
1103
1657e9bb 1104/*
1c8d13c8
TD
1105 * Returns a human readable string describing
1106 * the error code (a negative value).
1657e9bb 1107 */
9a745bc7 1108const char *lttng_strerror(int code)
1657e9bb 1109{
f73fabfd 1110 return error_get_str(code);
1657e9bb
DG
1111}
1112
aaf97519 1113/*
a4b92340
DG
1114 * Create a brand new session using name and url for destination.
1115 *
f73fabfd 1116 * Returns LTTNG_OK on success or a negative error code.
00e2e675 1117 */
a4b92340 1118int lttng_create_session(const char *name, const char *url)
00e2e675 1119{
3dd05a85 1120 int ret;
a4b92340 1121 ssize_t size;
00e2e675 1122 struct lttcomm_session_msg lsm;
a4b92340 1123 struct lttng_uri *uris = NULL;
00e2e675 1124
a4b92340 1125 if (name == NULL) {
2f70b271 1126 return -LTTNG_ERR_INVALID;
00e2e675
DG
1127 }
1128
a4b92340 1129 memset(&lsm, 0, sizeof(lsm));
00e2e675 1130
a4b92340 1131 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1132 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
a4b92340
DG
1133
1134 /* There should never be a data URL */
bc894455 1135 size = uri_parse_str_urls(url, NULL, &uris);
a4b92340 1136 if (size < 0) {
2f70b271 1137 return -LTTNG_ERR_INVALID;
00e2e675
DG
1138 }
1139
a4b92340
DG
1140 lsm.u.uri.size = size;
1141
cac3069d
DG
1142 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1143 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1144
1145 free(uris);
1146 return ret;
00e2e675
DG
1147}
1148
8028d920 1149/*
8028d920 1150 * Destroy session using name.
1c8d13c8 1151 * Returns size of returned session payload data or a negative error code.
8028d920 1152 */
843f5df9 1153int lttng_destroy_session(const char *session_name)
8028d920 1154{
cd80958d
DG
1155 struct lttcomm_session_msg lsm;
1156
843f5df9 1157 if (session_name == NULL) {
2f70b271 1158 return -LTTNG_ERR_INVALID;
cd80958d
DG
1159 }
1160
53efb85a 1161 memset(&lsm, 0, sizeof(lsm));
cd80958d 1162 lsm.cmd_type = LTTNG_DESTROY_SESSION;
843f5df9 1163
cac3069d
DG
1164 lttng_ctl_copy_string(lsm.session.name, session_name,
1165 sizeof(lsm.session.name));
cd80958d 1166
cac3069d 1167 return lttng_ctl_ask_sessiond(&lsm, NULL);
aaf97519
DG
1168}
1169
57167058 1170/*
57167058 1171 * Ask the session daemon for all available sessions.
1c8d13c8
TD
1172 * Sets the contents of the sessions array.
1173 * Returns the number of lttng_session entries in sessions;
1174 * on error, returns a negative value.
57167058 1175 */
ca95a216 1176int lttng_list_sessions(struct lttng_session **sessions)
57167058 1177{
ca95a216 1178 int ret;
cd80958d 1179 struct lttcomm_session_msg lsm;
57167058 1180
53efb85a 1181 memset(&lsm, 0, sizeof(lsm));
cd80958d 1182 lsm.cmd_type = LTTNG_LIST_SESSIONS;
cac3069d 1183 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
57167058 1184 if (ret < 0) {
ca95a216 1185 return ret;
57167058
DG
1186 }
1187
ca95a216 1188 return ret / sizeof(struct lttng_session);
57167058
DG
1189}
1190
9f19cc17 1191/*
1c8d13c8
TD
1192 * Ask the session daemon for all available domains of a session.
1193 * Sets the contents of the domains array.
1194 * Returns the number of lttng_domain entries in domains;
1195 * on error, returns a negative value.
9f19cc17 1196 */
330be774 1197int lttng_list_domains(const char *session_name,
cd80958d 1198 struct lttng_domain **domains)
9f19cc17
DG
1199{
1200 int ret;
cd80958d
DG
1201 struct lttcomm_session_msg lsm;
1202
330be774 1203 if (session_name == NULL) {
2f70b271 1204 return -LTTNG_ERR_INVALID;
cd80958d 1205 }
9f19cc17 1206
53efb85a 1207 memset(&lsm, 0, sizeof(lsm));
cd80958d
DG
1208 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1209
cac3069d
DG
1210 lttng_ctl_copy_string(lsm.session.name, session_name,
1211 sizeof(lsm.session.name));
cd80958d 1212
cac3069d 1213 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
9f19cc17
DG
1214 if (ret < 0) {
1215 return ret;
1216 }
1217
1218 return ret / sizeof(struct lttng_domain);
1219}
1220
1221/*
1c8d13c8
TD
1222 * Ask the session daemon for all available channels of a session.
1223 * Sets the contents of the channels array.
1224 * Returns the number of lttng_channel entries in channels;
1225 * on error, returns a negative value.
9f19cc17 1226 */
cd80958d
DG
1227int lttng_list_channels(struct lttng_handle *handle,
1228 struct lttng_channel **channels)
9f19cc17
DG
1229{
1230 int ret;
cd80958d
DG
1231 struct lttcomm_session_msg lsm;
1232
9d697d3d 1233 if (handle == NULL) {
2f70b271 1234 return -LTTNG_ERR_INVALID;
cd80958d
DG
1235 }
1236
53efb85a 1237 memset(&lsm, 0, sizeof(lsm));
cd80958d 1238 lsm.cmd_type = LTTNG_LIST_CHANNELS;
cac3069d 1239 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1240 sizeof(lsm.session.name));
9f19cc17 1241
cac3069d 1242 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1243
cac3069d 1244 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
9f19cc17
DG
1245 if (ret < 0) {
1246 return ret;
1247 }
1248
1249 return ret / sizeof(struct lttng_channel);
1250}
1251
1252/*
1c8d13c8
TD
1253 * Ask the session daemon for all available events of a session channel.
1254 * Sets the contents of the events array.
1255 * Returns the number of lttng_event entries in events;
1256 * on error, returns a negative value.
9f19cc17 1257 */
cd80958d
DG
1258int lttng_list_events(struct lttng_handle *handle,
1259 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
1260{
1261 int ret;
cd80958d 1262 struct lttcomm_session_msg lsm;
9f19cc17 1263
9d697d3d
DG
1264 /* Safety check. An handle and channel name are mandatory */
1265 if (handle == NULL || channel_name == NULL) {
2f70b271 1266 return -LTTNG_ERR_INVALID;
cd80958d
DG
1267 }
1268
53efb85a 1269 memset(&lsm, 0, sizeof(lsm));
cd80958d 1270 lsm.cmd_type = LTTNG_LIST_EVENTS;
cac3069d 1271 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1272 sizeof(lsm.session.name));
cac3069d 1273 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
cd80958d
DG
1274 sizeof(lsm.u.list.channel_name));
1275
cac3069d 1276 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1277
cac3069d 1278 ret = lttng_ctl_ask_sessiond(&lsm, (void**) events);
9f19cc17
DG
1279 if (ret < 0) {
1280 return ret;
1281 }
1282
1283 return ret / sizeof(struct lttng_event);
1284}
1285
fac6795d 1286/*
1c8d13c8
TD
1287 * Sets the tracing_group variable with name.
1288 * This function allocates memory pointed to by tracing_group.
1289 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
fac6795d
DG
1290 */
1291int lttng_set_tracing_group(const char *name)
1292{
9d697d3d 1293 if (name == NULL) {
2f70b271 1294 return -LTTNG_ERR_INVALID;
9d697d3d
DG
1295 }
1296
fac6795d 1297 if (asprintf(&tracing_group, "%s", name) < 0) {
2f70b271 1298 return -LTTNG_ERR_FATAL;
fac6795d
DG
1299 }
1300
1301 return 0;
1302}
1303
d0254c7c 1304/*
af87c45a 1305 * Returns size of returned session payload data or a negative error code.
d0254c7c 1306 */
cd80958d 1307int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
1308 struct lttng_calibrate *calibrate)
1309{
cd80958d 1310 struct lttcomm_session_msg lsm;
d0254c7c 1311
9d697d3d
DG
1312 /* Safety check. NULL pointer are forbidden */
1313 if (handle == NULL || calibrate == NULL) {
2f70b271 1314 return -LTTNG_ERR_INVALID;
cd80958d 1315 }
d0254c7c 1316
53efb85a 1317 memset(&lsm, 0, sizeof(lsm));
cd80958d 1318 lsm.cmd_type = LTTNG_CALIBRATE;
cac3069d 1319 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d0254c7c 1320
cd80958d
DG
1321 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
1322
cac3069d 1323 return lttng_ctl_ask_sessiond(&lsm, NULL);
d0254c7c
MD
1324}
1325
5edd7e09
DG
1326/*
1327 * Set default channel attributes.
441c16a7 1328 * If either or both of the arguments are null, attr content is zeroe'd.
5edd7e09
DG
1329 */
1330void lttng_channel_set_default_attr(struct lttng_domain *domain,
1331 struct lttng_channel_attr *attr)
1332{
1333 /* Safety check */
1334 if (attr == NULL || domain == NULL) {
1335 return;
1336 }
1337
eacaa7a6
DS
1338 memset(attr, 0, sizeof(struct lttng_channel_attr));
1339
0a9c6494
DG
1340 /* Same for all domains. */
1341 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
1342 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
1343 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
1344
5edd7e09
DG
1345 switch (domain->type) {
1346 case LTTNG_DOMAIN_KERNEL:
d92ff3ef
DG
1347 attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
1348 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
3e230f92 1349 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
5edd7e09
DG
1350 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
1351 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1352 break;
1353 case LTTNG_DOMAIN_UST:
0a9c6494
DG
1354 switch (domain->buf_type) {
1355 case LTTNG_BUFFER_PER_UID:
1356 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
1357 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
1358 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
1359 attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
1360 attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER;
1361 break;
1362 case LTTNG_BUFFER_PER_PID:
1363 default:
1364 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
1365 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
1366 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
1367 attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
1368 attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER;
1369 break;
1370 }
5edd7e09 1371 default:
441c16a7 1372 /* Default behavior: leave set to 0. */
5edd7e09
DG
1373 break;
1374 }
1375}
1376
fac6795d 1377/*
2269e89e 1378 * Check if session daemon is alive.
fac6795d 1379 *
2269e89e 1380 * Return 1 if alive or 0 if not.
1c8d13c8 1381 * On error returns a negative value.
fac6795d 1382 */
947308c4 1383int lttng_session_daemon_alive(void)
fac6795d
DG
1384{
1385 int ret;
1386
1387 ret = set_session_daemon_path();
1388 if (ret < 0) {
947308c4 1389 /* Error */
fac6795d
DG
1390 return ret;
1391 }
1392
9d035200 1393 if (*sessiond_sock_path == '\0') {
2f70b271
DG
1394 /*
1395 * No socket path set. Weird error which means the constructor was not
1396 * called.
1397 */
1398 assert(0);
fac6795d
DG
1399 }
1400
2269e89e 1401 ret = try_connect_sessiond(sessiond_sock_path);
7d8234d9
MD
1402 if (ret < 0) {
1403 /* Not alive */
1404 return 0;
1405 }
7d8234d9 1406
947308c4
DG
1407 /* Is alive */
1408 return 1;
fac6795d
DG
1409}
1410
00e2e675 1411/*
a4b92340 1412 * Set URL for a consumer for a session and domain.
00e2e675
DG
1413 *
1414 * Return 0 on success, else a negative value.
1415 */
a4b92340
DG
1416int lttng_set_consumer_url(struct lttng_handle *handle,
1417 const char *control_url, const char *data_url)
00e2e675 1418{
3dd05a85 1419 int ret;
a4b92340 1420 ssize_t size;
00e2e675 1421 struct lttcomm_session_msg lsm;
a4b92340 1422 struct lttng_uri *uris = NULL;
00e2e675 1423
a4b92340 1424 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
2f70b271 1425 return -LTTNG_ERR_INVALID;
00e2e675
DG
1426 }
1427
a4b92340
DG
1428 memset(&lsm, 0, sizeof(lsm));
1429
00e2e675
DG
1430 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
1431
cac3069d 1432 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
00e2e675 1433 sizeof(lsm.session.name));
cac3069d 1434 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
00e2e675 1435
bc894455 1436 size = uri_parse_str_urls(control_url, data_url, &uris);
a4b92340 1437 if (size < 0) {
2f70b271 1438 return -LTTNG_ERR_INVALID;
a4b92340
DG
1439 }
1440
1441 lsm.u.uri.size = size;
00e2e675 1442
cac3069d
DG
1443 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1444 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1445
1446 free(uris);
1447 return ret;
00e2e675
DG
1448}
1449
1450/*
9c6bda17 1451 * [OBSOLETE]
00e2e675
DG
1452 */
1453int lttng_enable_consumer(struct lttng_handle *handle)
1454{
785d2d0d 1455 return -ENOSYS;
00e2e675
DG
1456}
1457
1458/*
9c6bda17 1459 * [OBSOLETE]
00e2e675
DG
1460 */
1461int lttng_disable_consumer(struct lttng_handle *handle)
1462{
785d2d0d 1463 return -ENOSYS;
00e2e675
DG
1464}
1465
07424f16
DG
1466/*
1467 * This is an extension of create session that is ONLY and SHOULD only be used
1468 * by the lttng command line program. It exists to avoid using URI parsing in
1469 * the lttng client.
1470 *
1471 * We need the date and time for the trace path subdirectory for the case where
1472 * the user does NOT define one using either -o or -U. Using the normal
1473 * lttng_create_session API call, we have no clue on the session daemon side if
1474 * the URL was generated automatically by the client or define by the user.
1475 *
1476 * So this function "wrapper" is hidden from the public API, takes the datetime
1477 * string and appends it if necessary to the URI subdirectory before sending it
1478 * to the session daemon.
1479 *
1480 * With this extra function, the lttng_create_session call behavior is not
1481 * changed and the timestamp is appended to the URI on the session daemon side
1482 * if necessary.
1483 */
1484int _lttng_create_session_ext(const char *name, const char *url,
1485 const char *datetime)
1486{
3dd05a85 1487 int ret;
07424f16
DG
1488 ssize_t size;
1489 struct lttcomm_session_msg lsm;
1490 struct lttng_uri *uris = NULL;
1491
2bba9e53 1492 if (name == NULL || datetime == NULL) {
2f70b271 1493 return -LTTNG_ERR_INVALID;
07424f16
DG
1494 }
1495
1496 memset(&lsm, 0, sizeof(lsm));
1497
1498 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1499 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
07424f16
DG
1500
1501 /* There should never be a data URL */
bc894455 1502 size = uri_parse_str_urls(url, NULL, &uris);
07424f16 1503 if (size < 0) {
3dd05a85
DG
1504 ret = -LTTNG_ERR_INVALID;
1505 goto error;
07424f16
DG
1506 }
1507
1508 lsm.u.uri.size = size;
1509
4b35a6b3 1510 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
da4aa2b8
DG
1511 /* Don't append datetime if the name was automatically created. */
1512 if (strncmp(name, DEFAULT_SESSION_NAME "-",
1513 strlen(DEFAULT_SESSION_NAME) + 1)) {
1514 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
1515 name, datetime);
1516 } else {
1517 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
1518 }
07424f16
DG
1519 if (ret < 0) {
1520 PERROR("snprintf uri subdir");
3dd05a85
DG
1521 ret = -LTTNG_ERR_FATAL;
1522 goto error;
07424f16
DG
1523 }
1524 }
1525
cac3069d
DG
1526 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1527 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1528
1529error:
1530 free(uris);
1531 return ret;
07424f16
DG
1532}
1533
806e2684
DG
1534/*
1535 * For a given session name, this call checks if the data is ready to be read
1536 * or is still being extracted by the consumer(s) hence not ready to be used by
1537 * any readers.
1538 */
6d805429 1539int lttng_data_pending(const char *session_name)
806e2684
DG
1540{
1541 int ret;
1542 struct lttcomm_session_msg lsm;
1543
1544 if (session_name == NULL) {
1545 return -LTTNG_ERR_INVALID;
1546 }
1547
53efb85a 1548 memset(&lsm, 0, sizeof(lsm));
6d805429 1549 lsm.cmd_type = LTTNG_DATA_PENDING;
806e2684 1550
cac3069d
DG
1551 lttng_ctl_copy_string(lsm.session.name, session_name,
1552 sizeof(lsm.session.name));
806e2684 1553
cac3069d 1554 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
806e2684
DG
1555
1556 /*
cac3069d
DG
1557 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1558 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1559 * that the data is available. Yes it is hackish but for now this is the
1560 * only way.
806e2684
DG
1561 */
1562 if (ret == -1) {
1563 ret = 1;
1564 }
1565
1566 return ret;
1567}
1568
27babd3a
DG
1569/*
1570 * Create a session exclusively used for snapshot.
1571 *
1572 * Returns LTTNG_OK on success or a negative error code.
1573 */
1574int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
1575{
1576 int ret;
1577 ssize_t size;
1578 struct lttcomm_session_msg lsm;
1579 struct lttng_uri *uris = NULL;
1580
1581 if (name == NULL) {
1582 return -LTTNG_ERR_INVALID;
1583 }
1584
1585 memset(&lsm, 0, sizeof(lsm));
1586
1587 lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
1588 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1589
1590 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
1591 if (size < 0) {
1592 return -LTTNG_ERR_INVALID;
1593 }
1594
1595 lsm.u.uri.size = size;
1596
1597 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1598 sizeof(struct lttng_uri) * size, NULL);
1599
1600 free(uris);
1601 return ret;
1602}
1603
ecc48a90
JD
1604/*
1605 * Create a session exclusively used for live.
1606 *
1607 * Returns LTTNG_OK on success or a negative error code.
1608 */
1609int lttng_create_session_live(const char *name, const char *url,
1610 unsigned int timer_interval)
1611{
1612 int ret;
1613 ssize_t size;
1614 struct lttcomm_session_msg lsm;
1615 struct lttng_uri *uris = NULL;
1616
1617 if (name == NULL) {
1618 return -LTTNG_ERR_INVALID;
1619 }
1620
1621 memset(&lsm, 0, sizeof(lsm));
1622
1623 lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE;
1624 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1625
1a241656
DG
1626 if (url) {
1627 size = uri_parse_str_urls(url, NULL, &uris);
1628 if (size <= 0) {
1629 ret = -LTTNG_ERR_INVALID;
1630 goto end;
1631 }
ecc48a90 1632
1a241656
DG
1633 /* file:// is not accepted for live session. */
1634 if (uris[0].dtype == LTTNG_DST_PATH) {
1635 ret = -LTTNG_ERR_INVALID;
1636 goto end;
1637 }
1638 } else {
1639 size = 0;
ecc48a90
JD
1640 }
1641
1642 lsm.u.session_live.nb_uri = size;
1643 lsm.u.session_live.timer_interval = timer_interval;
1644
1645 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1646 sizeof(struct lttng_uri) * size, NULL);
1647
1648end:
1649 free(uris);
1650 return ret;
1651}
1652
fac6795d
DG
1653/*
1654 * lib constructor
1655 */
1656static void __attribute__((constructor)) init()
1657{
1658 /* Set default session group */
bbccc3d2 1659 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
fac6795d 1660}
49cca668
DG
1661
1662/*
1663 * lib destructor
1664 */
1665static void __attribute__((destructor)) lttng_ctl_exit()
1666{
1667 free(tracing_group);
1668}
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