Implement UST PID tracker
[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
6c1c0768 23#define _LGPL_SOURCE
44a5e5eb 24#include <assert.h>
fac6795d 25#include <grp.h>
1e307fab 26#include <errno.h>
fac6795d
DG
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
30#include <unistd.h>
31
990570ed
DG
32#include <common/common.h>
33#include <common/defaults.h>
db758600 34#include <common/sessiond-comm/sessiond-comm.h>
a4b92340 35#include <common/uri.h>
feb0f3e5 36#include <common/utils.h>
1e307fab 37#include <lttng/lttng.h>
0c89d795 38#include <lttng/health-internal.h>
fac6795d 39
d00c599e
DG
40#include "filter/filter-ast.h"
41#include "filter/filter-parser.h"
42#include "filter/filter-bytecode.h"
43#include "filter/memstream.h"
cac3069d 44#include "lttng-ctl-helper.h"
53a80697
MD
45
46#ifdef DEBUG
d00c599e 47static const int print_xml = 1;
53a80697
MD
48#define dbg_printf(fmt, args...) \
49 printf("[debug liblttng-ctl] " fmt, ## args)
50#else
d00c599e 51static const int print_xml = 0;
53a80697
MD
52#define dbg_printf(fmt, args...) \
53do { \
54 /* do nothing but check printf format */ \
55 if (0) \
56 printf("[debug liblttnctl] " fmt, ## args); \
57} while (0)
58#endif
59
60
fac6795d
DG
61/* Socket to session daemon for communication */
62static int sessiond_socket;
63static char sessiond_sock_path[PATH_MAX];
64
fac6795d
DG
65/* Variables */
66static char *tracing_group;
67static int connected;
68
97e19046
DG
69/* Global */
70
71/*
72 * Those two variables are used by error.h to silent or control the verbosity of
73 * error message. They are global to the library so application linking with it
74 * are able to compile correctly and also control verbosity of the library.
97e19046
DG
75 */
76int lttng_opt_quiet;
77int lttng_opt_verbose;
c7e35b03 78int lttng_opt_mi;
97e19046 79
99497cd0
MD
80/*
81 * Copy string from src to dst and enforce null terminated byte.
82 */
cac3069d
DG
83LTTNG_HIDDEN
84void lttng_ctl_copy_string(char *dst, const char *src, size_t len)
99497cd0 85{
e7d6716d 86 if (src && dst) {
99497cd0
MD
87 strncpy(dst, src, len);
88 /* Enforce the NULL terminated byte */
89 dst[len - 1] = '\0';
cd80958d
DG
90 } else if (dst) {
91 dst[0] = '\0';
99497cd0
MD
92 }
93}
94
fac6795d 95/*
cd80958d 96 * Copy domain to lttcomm_session_msg domain.
fac6795d 97 *
cd80958d
DG
98 * If domain is unknown, default domain will be the kernel.
99 */
cac3069d
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100LTTNG_HIDDEN
101void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
102 struct lttng_domain *src)
cd80958d
DG
103{
104 if (src && dst) {
105 switch (src->type) {
00e2e675
DG
106 case LTTNG_DOMAIN_KERNEL:
107 case LTTNG_DOMAIN_UST:
b9dfb167 108 case LTTNG_DOMAIN_JUL:
5cdb6027 109 case LTTNG_DOMAIN_LOG4J:
0e115563 110 case LTTNG_DOMAIN_PYTHON:
00e2e675
DG
111 memcpy(dst, src, sizeof(struct lttng_domain));
112 break;
113 default:
114 memset(dst, 0, sizeof(struct lttng_domain));
00e2e675 115 break;
cd80958d
DG
116 }
117 }
118}
119
120/*
121 * Send lttcomm_session_msg to the session daemon.
fac6795d 122 *
1c8d13c8
TD
123 * On success, returns the number of bytes sent (>=0)
124 * On error, returns -1
fac6795d 125 */
cd80958d 126static int send_session_msg(struct lttcomm_session_msg *lsm)
fac6795d
DG
127{
128 int ret;
129
130 if (!connected) {
2f70b271 131 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 132 goto end;
fac6795d
DG
133 }
134
a4b92340
DG
135 DBG("LSM cmd type : %d", lsm->cmd_type);
136
be040666 137 ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
cd80958d 138 sizeof(struct lttcomm_session_msg));
2f70b271
DG
139 if (ret < 0) {
140 ret = -LTTNG_ERR_FATAL;
141 }
e065084a
DG
142
143end:
144 return ret;
145}
146
53a80697
MD
147/*
148 * Send var len data to the session daemon.
149 *
150 * On success, returns the number of bytes sent (>=0)
151 * On error, returns -1
152 */
153static int send_session_varlen(void *data, size_t len)
154{
155 int ret;
156
157 if (!connected) {
2f70b271 158 ret = -LTTNG_ERR_NO_SESSIOND;
53a80697
MD
159 goto end;
160 }
a4b92340 161
53a80697
MD
162 if (!data || !len) {
163 ret = 0;
164 goto end;
165 }
166
167 ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
2f70b271
DG
168 if (ret < 0) {
169 ret = -LTTNG_ERR_FATAL;
170 }
53a80697
MD
171
172end:
173 return ret;
174}
175
e065084a 176/*
cd80958d 177 * Receive data from the sessiond socket.
e065084a 178 *
1c8d13c8
TD
179 * On success, returns the number of bytes received (>=0)
180 * On error, returns -1 (recvmsg() error) or -ENOTCONN
e065084a 181 */
ca95a216 182static int recv_data_sessiond(void *buf, size_t len)
e065084a
DG
183{
184 int ret;
185
186 if (!connected) {
2f70b271 187 ret = -LTTNG_ERR_NO_SESSIOND;
e065084a 188 goto end;
fac6795d
DG
189 }
190
ca95a216 191 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
2f70b271
DG
192 if (ret < 0) {
193 ret = -LTTNG_ERR_FATAL;
194 }
fac6795d 195
e065084a 196end:
fac6795d
DG
197 return ret;
198}
199
200/*
1c8d13c8 201 * Check if we are in the specified group.
65beb5ff 202 *
2269e89e 203 * If yes return 1, else return -1.
947308c4 204 */
6c71277b
MD
205LTTNG_HIDDEN
206int lttng_check_tracing_group(void)
947308c4
DG
207{
208 struct group *grp_tracing; /* no free(). See getgrnam(3) */
209 gid_t *grp_list;
210 int grp_list_size, grp_id, i;
211 int ret = -1;
6c71277b 212 const char *grp_name = tracing_group;
947308c4
DG
213
214 /* Get GID of group 'tracing' */
215 grp_tracing = getgrnam(grp_name);
b4d8603b
MD
216 if (!grp_tracing) {
217 /* If grp_tracing is NULL, the group does not exist. */
947308c4
DG
218 goto end;
219 }
220
221 /* Get number of supplementary group IDs */
222 grp_list_size = getgroups(0, NULL);
223 if (grp_list_size < 0) {
6f04ed72 224 PERROR("getgroups");
947308c4
DG
225 goto end;
226 }
227
228 /* Alloc group list of the right size */
3f451dc0 229 grp_list = zmalloc(grp_list_size * sizeof(gid_t));
00795392 230 if (!grp_list) {
6f04ed72 231 PERROR("malloc");
00795392
MD
232 goto end;
233 }
947308c4 234 grp_id = getgroups(grp_list_size, grp_list);
1c8d13c8 235 if (grp_id < 0) {
6f04ed72 236 PERROR("getgroups");
947308c4
DG
237 goto free_list;
238 }
239
240 for (i = 0; i < grp_list_size; i++) {
241 if (grp_list[i] == grp_tracing->gr_gid) {
2269e89e 242 ret = 1;
947308c4
DG
243 break;
244 }
245 }
246
247free_list:
248 free(grp_list);
249
250end:
251 return ret;
252}
253
254/*
2269e89e
DG
255 * Try connect to session daemon with sock_path.
256 *
257 * Return 0 on success, else -1
258 */
259static int try_connect_sessiond(const char *sock_path)
260{
261 int ret;
262
263 /* If socket exist, we check if the daemon listens for connect. */
264 ret = access(sock_path, F_OK);
265 if (ret < 0) {
266 /* Not alive */
2f70b271 267 goto error;
2269e89e
DG
268 }
269
270 ret = lttcomm_connect_unix_sock(sock_path);
271 if (ret < 0) {
272 /* Not alive */
2f70b271 273 goto error;
2269e89e
DG
274 }
275
276 ret = lttcomm_close_unix_sock(ret);
277 if (ret < 0) {
6f04ed72 278 PERROR("lttcomm_close_unix_sock");
2269e89e
DG
279 }
280
281 return 0;
2f70b271
DG
282
283error:
284 return -1;
2269e89e
DG
285}
286
287/*
2f70b271
DG
288 * Set sessiond socket path by putting it in the global sessiond_sock_path
289 * variable.
290 *
291 * Returns 0 on success, negative value on failure (the sessiond socket path
292 * is somehow too long or ENOMEM).
947308c4
DG
293 */
294static int set_session_daemon_path(void)
295{
2269e89e
DG
296 int in_tgroup = 0; /* In tracing group */
297 uid_t uid;
298
299 uid = getuid();
947308c4 300
2269e89e
DG
301 if (uid != 0) {
302 /* Are we in the tracing group ? */
6c71277b 303 in_tgroup = lttng_check_tracing_group();
2269e89e
DG
304 }
305
08a9c49f 306 if ((uid == 0) || in_tgroup) {
cac3069d
DG
307 lttng_ctl_copy_string(sessiond_sock_path,
308 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path));
08a9c49f 309 }
2269e89e 310
08a9c49f 311 if (uid != 0) {
c617c0c6
MD
312 int ret;
313
08a9c49f
TD
314 if (in_tgroup) {
315 /* Tracing group */
316 ret = try_connect_sessiond(sessiond_sock_path);
317 if (ret >= 0) {
318 goto end;
2269e89e 319 }
08a9c49f 320 /* Global session daemon not available... */
2269e89e 321 }
08a9c49f
TD
322 /* ...or not in tracing group (and not root), default */
323
324 /*
325 * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
326 * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
327 */
328 ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
feb0f3e5 329 DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
08a9c49f 330 if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
2f70b271 331 goto error;
947308c4 332 }
947308c4 333 }
08a9c49f 334end:
947308c4 335 return 0;
2f70b271
DG
336
337error:
338 return -1;
947308c4
DG
339}
340
65beb5ff
DG
341/*
342 * Connect to the LTTng session daemon.
343 *
344 * On success, return 0. On error, return -1.
345 */
346static int connect_sessiond(void)
347{
348 int ret;
349
da3c9ec1
DG
350 /* Don't try to connect if already connected. */
351 if (connected) {
352 return 0;
353 }
354
65beb5ff
DG
355 ret = set_session_daemon_path();
356 if (ret < 0) {
2f70b271 357 goto error;
65beb5ff
DG
358 }
359
360 /* Connect to the sesssion daemon */
361 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
362 if (ret < 0) {
2f70b271 363 goto error;
65beb5ff
DG
364 }
365
366 sessiond_socket = ret;
367 connected = 1;
368
369 return 0;
2f70b271
DG
370
371error:
372 return -1;
65beb5ff
DG
373}
374
375/*
1c8d13c8
TD
376 * Clean disconnect from the session daemon.
377 * On success, return 0. On error, return -1.
65beb5ff
DG
378 */
379static int disconnect_sessiond(void)
380{
381 int ret = 0;
382
383 if (connected) {
384 ret = lttcomm_close_unix_sock(sessiond_socket);
385 sessiond_socket = 0;
386 connected = 0;
387 }
388
389 return ret;
390}
391
35a6fdb7 392/*
cd80958d 393 * Ask the session daemon a specific command and put the data into buf.
53a80697 394 * Takes extra var. len. data as input to send to the session daemon.
65beb5ff 395 *
af87c45a 396 * Return size of data (only payload, not header) or a negative error code.
65beb5ff 397 */
cac3069d
DG
398LTTNG_HIDDEN
399int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
a4b92340 400 void *vardata, size_t varlen, void **buf)
65beb5ff
DG
401{
402 int ret;
403 size_t size;
404 void *data = NULL;
cd80958d 405 struct lttcomm_lttng_msg llm;
65beb5ff
DG
406
407 ret = connect_sessiond();
408 if (ret < 0) {
2f70b271 409 ret = -LTTNG_ERR_NO_SESSIOND;
65beb5ff
DG
410 goto end;
411 }
412
65beb5ff 413 /* Send command to session daemon */
cd80958d 414 ret = send_session_msg(lsm);
65beb5ff 415 if (ret < 0) {
2f70b271 416 /* Ret value is a valid lttng error code. */
65beb5ff
DG
417 goto end;
418 }
53a80697
MD
419 /* Send var len data */
420 ret = send_session_varlen(vardata, varlen);
421 if (ret < 0) {
2f70b271 422 /* Ret value is a valid lttng error code. */
53a80697
MD
423 goto end;
424 }
65beb5ff
DG
425
426 /* Get header from data transmission */
427 ret = recv_data_sessiond(&llm, sizeof(llm));
428 if (ret < 0) {
2f70b271 429 /* Ret value is a valid lttng error code. */
65beb5ff
DG
430 goto end;
431 }
432
433 /* Check error code if OK */
f73fabfd 434 if (llm.ret_code != LTTNG_OK) {
65beb5ff
DG
435 ret = -llm.ret_code;
436 goto end;
437 }
438
439 size = llm.data_size;
440 if (size == 0) {
874d3f84 441 /* If client free with size 0 */
a45d5536
DG
442 if (buf != NULL) {
443 *buf = NULL;
444 }
7d29a247 445 ret = 0;
65beb5ff
DG
446 goto end;
447 }
448
3f451dc0
MD
449 data = zmalloc(size);
450 if (!data) {
451 ret = -ENOMEM;
452 goto end;
453 }
65beb5ff
DG
454
455 /* Get payload data */
456 ret = recv_data_sessiond(data, size);
457 if (ret < 0) {
458 free(data);
459 goto end;
460 }
461
83009e5e
DG
462 /*
463 * Extra protection not to dereference a NULL pointer. If buf is NULL at
464 * this point, an error is returned and data is freed.
465 */
466 if (buf == NULL) {
2f70b271 467 ret = -LTTNG_ERR_INVALID;
83009e5e
DG
468 free(data);
469 goto end;
470 }
471
65beb5ff
DG
472 *buf = data;
473 ret = size;
474
475end:
476 disconnect_sessiond();
477 return ret;
478}
479
9f19cc17 480/*
cd80958d 481 * Create lttng handle and return pointer.
1c8d13c8 482 * The returned pointer will be NULL in case of malloc() error.
9f19cc17 483 */
cd80958d
DG
484struct lttng_handle *lttng_create_handle(const char *session_name,
485 struct lttng_domain *domain)
9f19cc17 486{
2f70b271
DG
487 struct lttng_handle *handle = NULL;
488
489 if (domain == NULL) {
490 goto end;
491 }
cd80958d 492
3f451dc0 493 handle = zmalloc(sizeof(struct lttng_handle));
cd80958d 494 if (handle == NULL) {
2f70b271 495 PERROR("malloc handle");
cd80958d
DG
496 goto end;
497 }
498
499 /* Copy session name */
cac3069d 500 lttng_ctl_copy_string(handle->session_name, session_name,
cd80958d
DG
501 sizeof(handle->session_name));
502
503 /* Copy lttng domain */
cac3069d 504 lttng_ctl_copy_lttng_domain(&handle->domain, domain);
cd80958d
DG
505
506end:
507 return handle;
508}
509
510/*
511 * Destroy handle by free(3) the pointer.
512 */
513void lttng_destroy_handle(struct lttng_handle *handle)
514{
0e428499 515 free(handle);
eb354453
DG
516}
517
d9800920
DG
518/*
519 * Register an outside consumer.
1c8d13c8 520 * Returns size of returned session payload data or a negative error code.
d9800920
DG
521 */
522int lttng_register_consumer(struct lttng_handle *handle,
523 const char *socket_path)
524{
525 struct lttcomm_session_msg lsm;
526
2f70b271
DG
527 if (handle == NULL || socket_path == NULL) {
528 return -LTTNG_ERR_INVALID;
529 }
530
53efb85a 531 memset(&lsm, 0, sizeof(lsm));
d9800920 532 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
cac3069d 533 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
d9800920 534 sizeof(lsm.session.name));
cac3069d 535 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d9800920 536
cac3069d 537 lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
d9800920 538
cac3069d 539 return lttng_ctl_ask_sessiond(&lsm, NULL);
d9800920
DG
540}
541
1df4dedd 542/*
1c8d13c8
TD
543 * Start tracing for all traces of the session.
544 * Returns size of returned session payload data or a negative error code.
1df4dedd 545 */
6a4f824d 546int lttng_start_tracing(const char *session_name)
f3ed775e 547{
cd80958d
DG
548 struct lttcomm_session_msg lsm;
549
6a4f824d 550 if (session_name == NULL) {
2f70b271 551 return -LTTNG_ERR_INVALID;
cd80958d
DG
552 }
553
53efb85a 554 memset(&lsm, 0, sizeof(lsm));
cd80958d 555 lsm.cmd_type = LTTNG_START_TRACE;
6a4f824d 556
cac3069d
DG
557 lttng_ctl_copy_string(lsm.session.name, session_name,
558 sizeof(lsm.session.name));
cd80958d 559
cac3069d 560 return lttng_ctl_ask_sessiond(&lsm, NULL);
f3ed775e 561}
1df4dedd
DG
562
563/*
38ee087f 564 * Stop tracing for all traces of the session.
f3ed775e 565 */
38ee087f 566static int _lttng_stop_tracing(const char *session_name, int wait)
f3ed775e 567{
38ee087f 568 int ret, data_ret;
cd80958d
DG
569 struct lttcomm_session_msg lsm;
570
6a4f824d 571 if (session_name == NULL) {
2f70b271 572 return -LTTNG_ERR_INVALID;
6a4f824d
DG
573 }
574
53efb85a 575 memset(&lsm, 0, sizeof(lsm));
cd80958d 576 lsm.cmd_type = LTTNG_STOP_TRACE;
6a4f824d 577
cac3069d
DG
578 lttng_ctl_copy_string(lsm.session.name, session_name,
579 sizeof(lsm.session.name));
cd80958d 580
cac3069d 581 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
38ee087f
DG
582 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
583 goto error;
584 }
585
586 if (!wait) {
587 goto end;
588 }
589
38ee087f
DG
590 /* Check for data availability */
591 do {
6d805429 592 data_ret = lttng_data_pending(session_name);
38ee087f
DG
593 if (data_ret < 0) {
594 /* Return the data available call error. */
595 ret = data_ret;
596 goto error;
597 }
598
599 /*
600 * Data sleep time before retrying (in usec). Don't sleep if the call
601 * returned value indicates availability.
602 */
6d805429 603 if (data_ret) {
38ee087f 604 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
38ee087f 605 }
6d805429 606 } while (data_ret != 0);
38ee087f 607
38ee087f
DG
608end:
609error:
610 return ret;
611}
612
613/*
614 * Stop tracing and wait for data availability.
615 */
616int lttng_stop_tracing(const char *session_name)
617{
618 return _lttng_stop_tracing(session_name, 1);
619}
620
621/*
622 * Stop tracing but _don't_ wait for data availability.
623 */
624int lttng_stop_tracing_no_wait(const char *session_name)
625{
626 return _lttng_stop_tracing(session_name, 0);
f3ed775e
DG
627}
628
629/*
601d5acf
DG
630 * Add context to a channel.
631 *
632 * If the given channel is NULL, add the contexts to all channels.
633 * The event_name param is ignored.
af87c45a
DG
634 *
635 * Returns the size of the returned payload data or a negative error code.
1df4dedd 636 */
cd80958d 637int lttng_add_context(struct lttng_handle *handle,
38057ed1
DG
638 struct lttng_event_context *ctx, const char *event_name,
639 const char *channel_name)
d65106b1 640{
cd80958d
DG
641 struct lttcomm_session_msg lsm;
642
9d697d3d
DG
643 /* Safety check. Both are mandatory */
644 if (handle == NULL || ctx == NULL) {
2f70b271 645 return -LTTNG_ERR_INVALID;
cd80958d
DG
646 }
647
441c16a7
MD
648 memset(&lsm, 0, sizeof(lsm));
649
cd80958d
DG
650 lsm.cmd_type = LTTNG_ADD_CONTEXT;
651
85076754
MD
652 /* If no channel name, send empty string. */
653 if (channel_name == NULL) {
654 lttng_ctl_copy_string(lsm.u.context.channel_name, "",
655 sizeof(lsm.u.context.channel_name));
656 } else {
657 lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name,
658 sizeof(lsm.u.context.channel_name));
659 }
cd80958d 660
cac3069d 661 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d65106b1 662
9d697d3d 663 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
d65106b1 664
cac3069d 665 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
666 sizeof(lsm.session.name));
667
cac3069d 668 return lttng_ctl_ask_sessiond(&lsm, NULL);
d65106b1
DG
669}
670
f3ed775e 671/*
1c8d13c8
TD
672 * Enable event(s) for a channel.
673 * If no event name is specified, all events are enabled.
674 * If no channel name is specified, the default 'channel0' is used.
675 * Returns size of returned session payload data or a negative error code.
f3ed775e 676 */
cd80958d 677int lttng_enable_event(struct lttng_handle *handle,
38057ed1 678 struct lttng_event *ev, const char *channel_name)
1df4dedd 679{
f8a96544
JI
680 return lttng_enable_event_with_exclusions(handle, ev, channel_name,
681 NULL, 0, NULL);
1df4dedd
DG
682}
683
53a80697 684/*
025faf73 685 * Create or enable an event with a filter expression.
178191b3 686 *
53a80697
MD
687 * Return negative error value on error.
688 * Return size of returned session payload data if OK.
689 */
025faf73 690int lttng_enable_event_with_filter(struct lttng_handle *handle,
178191b3 691 struct lttng_event *event, const char *channel_name,
53a80697
MD
692 const char *filter_expression)
693{
f8a96544
JI
694 return lttng_enable_event_with_exclusions(handle, event, channel_name,
695 filter_expression, 0, NULL);
53a80697
MD
696}
697
347c5ab5 698/*
0e115563 699 * Depending on the event, return a newly allocated agent filter expression or
347c5ab5
DG
700 * NULL if not applicable.
701 *
702 * An event with NO loglevel and the name is * will return NULL.
703 */
0e115563 704static char *set_agent_filter(const char *filter, struct lttng_event *ev)
347c5ab5
DG
705{
706 int err;
0e115563 707 char *agent_filter = NULL;
347c5ab5
DG
708
709 assert(ev);
710
711 /* Don't add filter for the '*' event. */
712 if (ev->name[0] != '*') {
713 if (filter) {
0e115563 714 err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter,
347c5ab5
DG
715 ev->name);
716 } else {
0e115563 717 err = asprintf(&agent_filter, "logger_name == \"%s\"", ev->name);
347c5ab5
DG
718 }
719 if (err < 0) {
720 PERROR("asprintf");
6a556f7b 721 goto error;
347c5ab5
DG
722 }
723 }
724
725 /* Add loglevel filtering if any for the JUL domain. */
726 if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) {
727 char *op;
728
729 if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) {
730 op = ">=";
731 } else {
732 op = "==";
733 }
734
0e115563 735 if (filter || agent_filter) {
6a556f7b
JG
736 char *new_filter;
737
fb0edb23 738 err = asprintf(&new_filter, "(%s) && (int_loglevel %s %d)",
0e115563 739 agent_filter ? agent_filter : filter, op,
347c5ab5 740 ev->loglevel);
0e115563
DG
741 if (agent_filter) {
742 free(agent_filter);
6a556f7b 743 }
0e115563 744 agent_filter = new_filter;
347c5ab5 745 } else {
0e115563 746 err = asprintf(&agent_filter, "int_loglevel %s %d", op,
347c5ab5
DG
747 ev->loglevel);
748 }
749 if (err < 0) {
750 PERROR("asprintf");
6a556f7b 751 goto error;
347c5ab5
DG
752 }
753 }
754
0e115563 755 return agent_filter;
6a556f7b 756error:
0e115563 757 free(agent_filter);
6a556f7b 758 return NULL;
347c5ab5
DG
759}
760
137b9942
DG
761/*
762 * Generate the filter bytecode from a give filter expression string. Put the
763 * newly allocated parser context in ctxp and populate the lsm object with the
764 * expression len.
765 *
766 * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched.
767 */
768static int generate_filter(char *filter_expression,
769 struct lttcomm_session_msg *lsm, struct filter_parser_ctx **ctxp)
770{
771 int ret;
772 struct filter_parser_ctx *ctx = NULL;
773 FILE *fmem = NULL;
774
775 assert(filter_expression);
776 assert(lsm);
777 assert(ctxp);
778
779 /*
780 * Casting const to non-const, as the underlying function will use it in
781 * read-only mode.
782 */
783 fmem = lttng_fmemopen((void *) filter_expression,
784 strlen(filter_expression), "r");
785 if (!fmem) {
786 fprintf(stderr, "Error opening memory as stream\n");
787 ret = -LTTNG_ERR_FILTER_NOMEM;
788 goto error;
789 }
790 ctx = filter_parser_ctx_alloc(fmem);
791 if (!ctx) {
792 fprintf(stderr, "Error allocating parser\n");
793 ret = -LTTNG_ERR_FILTER_NOMEM;
794 goto filter_alloc_error;
795 }
796 ret = filter_parser_ctx_append_ast(ctx);
797 if (ret) {
798 fprintf(stderr, "Parse error\n");
799 ret = -LTTNG_ERR_FILTER_INVAL;
800 goto parse_error;
801 }
802 ret = filter_visitor_set_parent(ctx);
803 if (ret) {
804 fprintf(stderr, "Set parent error\n");
805 ret = -LTTNG_ERR_FILTER_INVAL;
806 goto parse_error;
807 }
808 if (print_xml) {
809 ret = filter_visitor_print_xml(ctx, stdout, 0);
810 if (ret) {
811 fflush(stdout);
812 fprintf(stderr, "XML print error\n");
813 ret = -LTTNG_ERR_FILTER_INVAL;
814 goto parse_error;
815 }
816 }
817
818 dbg_printf("Generating IR... ");
819 fflush(stdout);
820 ret = filter_visitor_ir_generate(ctx);
821 if (ret) {
822 fprintf(stderr, "Generate IR error\n");
823 ret = -LTTNG_ERR_FILTER_INVAL;
824 goto parse_error;
825 }
826 dbg_printf("done\n");
827
828 dbg_printf("Validating IR... ");
829 fflush(stdout);
830 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
831 if (ret) {
832 ret = -LTTNG_ERR_FILTER_INVAL;
833 goto parse_error;
834 }
dcd5daf2
JG
835 /* Validate strings used as literals in the expression */
836 ret = filter_visitor_ir_validate_string(ctx);
837 if (ret) {
838 ret = -LTTNG_ERR_FILTER_INVAL;
839 goto parse_error;
840 }
137b9942
DG
841 dbg_printf("done\n");
842
843 dbg_printf("Generating bytecode... ");
844 fflush(stdout);
845 ret = filter_visitor_bytecode_generate(ctx);
846 if (ret) {
847 fprintf(stderr, "Generate bytecode error\n");
848 ret = -LTTNG_ERR_FILTER_INVAL;
849 goto parse_error;
850 }
851 dbg_printf("done\n");
852 dbg_printf("Size of bytecode generated: %u bytes.\n",
853 bytecode_get_len(&ctx->bytecode->b));
854
855 lsm->u.enable.bytecode_len = sizeof(ctx->bytecode->b)
856 + bytecode_get_len(&ctx->bytecode->b);
857 lsm->u.enable.expression_len = strlen(filter_expression) + 1;
858
859 /* No need to keep the memory stream. */
860 if (fclose(fmem) != 0) {
6f04ed72 861 PERROR("fclose");
137b9942
DG
862 }
863
864 *ctxp = ctx;
865 return 0;
866
867parse_error:
137b9942
DG
868 filter_ir_free(ctx);
869 filter_parser_ctx_free(ctx);
870filter_alloc_error:
871 if (fclose(fmem) != 0) {
6f04ed72 872 PERROR("fclose");
137b9942
DG
873 }
874error:
875 return ret;
876}
877
93deb080
JI
878/*
879 * Enable event(s) for a channel, possibly with exclusions and a filter.
880 * If no event name is specified, all events are enabled.
881 * If no channel name is specified, the default name is used.
882 * If filter expression is not NULL, the filter is set for the event.
883 * If exclusion count is not zero, the exclusions are set for the event.
884 * Returns size of returned session payload data or a negative error code.
885 */
886int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
887 struct lttng_event *ev, const char *channel_name,
e9efbcd3 888 const char *original_filter_expression,
93deb080
JI
889 int exclusion_count, char **exclusion_list)
890{
891 struct lttcomm_session_msg lsm;
64226865 892 char *varlen_data;
93deb080 893 int ret = 0;
137b9942 894 unsigned int free_filter_expression = 0;
93deb080 895 struct filter_parser_ctx *ctx = NULL;
e9efbcd3
JG
896 /*
897 * Cast as non-const since we may replace the filter expression
898 * by a dynamically allocated string. Otherwise, the original
899 * string is not modified.
900 */
901 char *filter_expression = (char *) original_filter_expression;
93deb080
JI
902
903 if (handle == NULL || ev == NULL) {
137b9942
DG
904 ret = -LTTNG_ERR_INVALID;
905 goto error;
93deb080
JI
906 }
907
908 /* Empty filter string will always be rejected by the parser
909 * anyway, so treat this corner-case early to eliminate
910 * lttng_fmemopen error for 0-byte allocation.
911 */
912 if (filter_expression && filter_expression[0] == '\0') {
137b9942
DG
913 ret = -LTTNG_ERR_INVALID;
914 goto error;
93deb080
JI
915 }
916
917 memset(&lsm, 0, sizeof(lsm));
918
919 /* If no channel name, send empty string. */
920 if (channel_name == NULL) {
921 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
922 sizeof(lsm.u.enable.channel_name));
923 } else {
924 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
925 sizeof(lsm.u.enable.channel_name));
926 }
927
18a720cd
MD
928 lsm.cmd_type = LTTNG_ENABLE_EVENT;
929 if (ev->name[0] == '\0') {
930 /* Enable all events */
931 lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name));
6565421f 932 }
93deb080 933
6565421f 934 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
6e911cad 935 /* FIXME: copying non-packed struct to packed struct. */
93deb080
JI
936 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
937
938 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
939 sizeof(lsm.session.name));
940 lsm.u.enable.exclusion_count = exclusion_count;
941 lsm.u.enable.bytecode_len = 0;
942
9b21e6d5
DG
943 /*
944 * For the JUL domain, a filter is enforced except for the enable all
945 * event. This is done to avoid having the event in all sessions thus
946 * filtering by logger name.
947 */
948 if (exclusion_count == 0 && filter_expression == NULL &&
5cdb6027 949 (handle->domain.type != LTTNG_DOMAIN_JUL &&
0e115563
DG
950 handle->domain.type != LTTNG_DOMAIN_LOG4J &&
951 handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
3e1c9ff7 952 goto ask_sessiond;
93deb080
JI
953 }
954
955 /*
956 * We have either a filter or some exclusions, so we need to set up
957 * a variable-length memory block from where to send the data
958 */
959
960 /* Parse filter expression */
5cdb6027 961 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
0e115563
DG
962 || handle->domain.type == LTTNG_DOMAIN_LOG4J
963 || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
5cdb6027 964 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
0e115563
DG
965 handle->domain.type == LTTNG_DOMAIN_LOG4J ||
966 handle->domain.type == LTTNG_DOMAIN_PYTHON) {
967 char *agent_filter;
64226865 968
347c5ab5 969 /* Setup JUL filter if needed. */
0e115563
DG
970 agent_filter = set_agent_filter(filter_expression, ev);
971 if (!agent_filter) {
137b9942
DG
972 if (!filter_expression) {
973 /* No JUL and no filter, just skip everything below. */
974 goto ask_sessiond;
975 }
64226865
DG
976 } else {
977 /*
0e115563
DG
978 * With an agent filter, the original filter has been added to
979 * it thus replace the filter expression.
64226865 980 */
0e115563 981 filter_expression = agent_filter;
e9efbcd3 982 free_filter_expression = 1;
9b21e6d5 983 }
9b21e6d5 984 }
93deb080 985
137b9942 986 ret = generate_filter(filter_expression, &lsm, &ctx);
93deb080 987 if (ret) {
137b9942 988 goto filter_error;
93deb080 989 }
6b453b5e
JG
990 }
991
992 varlen_data = zmalloc(lsm.u.enable.bytecode_len
137b9942
DG
993 + lsm.u.enable.expression_len
994 + LTTNG_SYMBOL_NAME_LEN * exclusion_count);
6b453b5e
JG
995 if (!varlen_data) {
996 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
7ca1dc6f 997 goto mem_error;
6b453b5e 998 }
137b9942 999
6b453b5e
JG
1000 /* Put exclusion names first in the data */
1001 while (exclusion_count--) {
1002 strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count,
137b9942 1003 *(exclusion_list + exclusion_count), LTTNG_SYMBOL_NAME_LEN);
6b453b5e
JG
1004 }
1005 /* Add filter expression next */
1006 if (lsm.u.enable.expression_len != 0) {
1007 memcpy(varlen_data
1008 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count,
1009 filter_expression,
1010 lsm.u.enable.expression_len);
1011 }
1012 /* Add filter bytecode next */
137b9942 1013 if (ctx && lsm.u.enable.bytecode_len != 0) {
6b453b5e
JG
1014 memcpy(varlen_data
1015 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count
1016 + lsm.u.enable.expression_len,
1017 &ctx->bytecode->b,
1018 lsm.u.enable.bytecode_len);
93deb080
JI
1019 }
1020
1021 ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data,
67676bd8 1022 (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) +
137b9942 1023 lsm.u.enable.bytecode_len + lsm.u.enable.expression_len, NULL);
6b453b5e 1024 free(varlen_data);
93deb080 1025
7ca1dc6f
DG
1026mem_error:
1027 if (filter_expression && ctx) {
93deb080
JI
1028 filter_bytecode_free(ctx);
1029 filter_ir_free(ctx);
1030 filter_parser_ctx_free(ctx);
7ca1dc6f
DG
1031 }
1032filter_error:
1033 if (free_filter_expression) {
1034 /*
1035 * The filter expression has been replaced and must be freed as it is
1036 * not the original filter expression received as a parameter.
1037 */
1038 free(filter_expression);
93deb080 1039 }
137b9942
DG
1040error:
1041 /*
1042 * Return directly to the caller and don't ask the sessiond since something
1043 * went wrong in the parsing of data above.
1044 */
93deb080 1045 return ret;
3e1c9ff7
DG
1046
1047ask_sessiond:
1048 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1049 return ret;
93deb080
JI
1050}
1051
6e911cad
MD
1052int lttng_disable_event_ext(struct lttng_handle *handle,
1053 struct lttng_event *ev, const char *channel_name,
1054 const char *original_filter_expression)
1df4dedd 1055{
cd80958d 1056 struct lttcomm_session_msg lsm;
6e911cad
MD
1057 char *varlen_data;
1058 int ret = 0;
1059 unsigned int free_filter_expression = 0;
1060 struct filter_parser_ctx *ctx = NULL;
1061 /*
1062 * Cast as non-const since we may replace the filter expression
1063 * by a dynamically allocated string. Otherwise, the original
1064 * string is not modified.
1065 */
1066 char *filter_expression = (char *) original_filter_expression;
1df4dedd 1067
6e911cad
MD
1068 if (handle == NULL || ev == NULL) {
1069 ret = -LTTNG_ERR_INVALID;
1070 goto error;
1071 }
1072
1073 /* Empty filter string will always be rejected by the parser
1074 * anyway, so treat this corner-case early to eliminate
1075 * lttng_fmemopen error for 0-byte allocation.
1076 */
1077 if (filter_expression && filter_expression[0] == '\0') {
1078 ret = -LTTNG_ERR_INVALID;
1079 goto error;
cd80958d
DG
1080 }
1081
441c16a7
MD
1082 memset(&lsm, 0, sizeof(lsm));
1083
85076754
MD
1084 /* If no channel name, send empty string. */
1085 if (channel_name == NULL) {
1086 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
cd80958d 1087 sizeof(lsm.u.disable.channel_name));
f3ed775e 1088 } else {
85076754 1089 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
cd80958d 1090 sizeof(lsm.u.disable.channel_name));
eb354453
DG
1091 }
1092
18a720cd
MD
1093 lsm.cmd_type = LTTNG_DISABLE_EVENT;
1094 if (ev->name[0] == '\0') {
1095 /* Disable all events */
1096 lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name));
f3ed775e
DG
1097 }
1098
6e911cad
MD
1099 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1100 /* FIXME: copying non-packed struct to packed struct. */
1101 memcpy(&lsm.u.disable.event, ev, sizeof(lsm.u.disable.event));
1102
cac3069d 1103 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1104 sizeof(lsm.session.name));
6e911cad 1105 lsm.u.disable.bytecode_len = 0;
cd80958d 1106
6e911cad
MD
1107 /*
1108 * For the JUL domain, a filter is enforced except for the
1109 * disable all event. This is done to avoid having the event in
1110 * all sessions thus filtering by logger name.
1111 */
1112 if (filter_expression == NULL &&
1113 (handle->domain.type != LTTNG_DOMAIN_JUL &&
0e115563
DG
1114 handle->domain.type != LTTNG_DOMAIN_LOG4J &&
1115 handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
6e911cad
MD
1116 goto ask_sessiond;
1117 }
1118
1119 /*
1120 * We have a filter, so we need to set up a variable-length
1121 * memory block from where to send the data.
1122 */
1123
1124 /* Parse filter expression */
1125 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
0e115563
DG
1126 || handle->domain.type == LTTNG_DOMAIN_LOG4J
1127 || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
6e911cad 1128 if (handle->domain.type == LTTNG_DOMAIN_JUL ||
0e115563
DG
1129 handle->domain.type == LTTNG_DOMAIN_LOG4J ||
1130 handle->domain.type == LTTNG_DOMAIN_PYTHON) {
1131 char *agent_filter;
6e911cad
MD
1132
1133 /* Setup JUL filter if needed. */
0e115563
DG
1134 agent_filter = set_agent_filter(filter_expression, ev);
1135 if (!agent_filter) {
6e911cad
MD
1136 if (!filter_expression) {
1137 /* No JUL and no filter, just skip everything below. */
1138 goto ask_sessiond;
1139 }
1140 } else {
1141 /*
1142 * With a JUL filter, the original filter has been added to it
1143 * thus replace the filter expression.
1144 */
0e115563 1145 filter_expression = agent_filter;
6e911cad
MD
1146 free_filter_expression = 1;
1147 }
1148 }
1149
1150 ret = generate_filter(filter_expression, &lsm, &ctx);
1151 if (ret) {
1152 goto filter_error;
1153 }
1154 }
1155
1156 varlen_data = zmalloc(lsm.u.disable.bytecode_len
1157 + lsm.u.disable.expression_len);
1158 if (!varlen_data) {
1159 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
1160 goto mem_error;
1161 }
1162
1163 /* Add filter expression */
1164 if (lsm.u.disable.expression_len != 0) {
1165 memcpy(varlen_data,
1166 filter_expression,
1167 lsm.u.disable.expression_len);
1168 }
1169 /* Add filter bytecode next */
1170 if (ctx && lsm.u.disable.bytecode_len != 0) {
1171 memcpy(varlen_data
1172 + lsm.u.disable.expression_len,
1173 &ctx->bytecode->b,
1174 lsm.u.disable.bytecode_len);
1175 }
1176
1177 ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data,
1178 lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL);
1179 free(varlen_data);
1180
1181mem_error:
1182 if (filter_expression && ctx) {
1183 filter_bytecode_free(ctx);
1184 filter_ir_free(ctx);
1185 filter_parser_ctx_free(ctx);
1186 }
1187filter_error:
1188 if (free_filter_expression) {
1189 /*
1190 * The filter expression has been replaced and must be freed as it is
1191 * not the original filter expression received as a parameter.
1192 */
1193 free(filter_expression);
1194 }
1195error:
1196 /*
1197 * Return directly to the caller and don't ask the sessiond since something
1198 * went wrong in the parsing of data above.
1199 */
1200 return ret;
1201
1202ask_sessiond:
1203 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1204 return ret;
1205}
1206
1207/*
1208 * Disable event(s) of a channel and domain.
1209 * If no event name is specified, all events are disabled.
1210 * If no channel name is specified, the default 'channel0' is used.
1211 * Returns size of returned session payload data or a negative error code.
1212 */
1213int lttng_disable_event(struct lttng_handle *handle, const char *name,
1214 const char *channel_name)
1215{
1216 struct lttng_event ev;
1217
1218 memset(&ev, 0, sizeof(ev));
9b7431cf 1219 ev.loglevel = -1;
6e911cad
MD
1220 ev.type = LTTNG_EVENT_ALL;
1221 lttng_ctl_copy_string(ev.name, name, sizeof(ev.name));
1222 return lttng_disable_event_ext(handle, &ev, channel_name, NULL);
1df4dedd
DG
1223}
1224
1225/*
1c8d13c8
TD
1226 * Enable channel per domain
1227 * Returns size of returned session payload data or a negative error code.
a5c5a2bd 1228 */
cd80958d 1229int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 1230 struct lttng_channel *chan)
a5c5a2bd 1231{
cd80958d
DG
1232 struct lttcomm_session_msg lsm;
1233
5117eeec
DG
1234 /*
1235 * NULL arguments are forbidden. No default values.
1236 */
1237 if (handle == NULL || chan == NULL) {
2f70b271 1238 return -LTTNG_ERR_INVALID;
cd80958d
DG
1239 }
1240
441c16a7
MD
1241 memset(&lsm, 0, sizeof(lsm));
1242
5117eeec 1243 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
7d29a247 1244
cd80958d
DG
1245 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
1246
cac3069d 1247 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
7d29a247 1248
cac3069d 1249 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1250 sizeof(lsm.session.name));
1251
cac3069d 1252 return lttng_ctl_ask_sessiond(&lsm, NULL);
8c0faa1d 1253}
1df4dedd 1254
2ef84c95 1255/*
1c8d13c8
TD
1256 * All tracing will be stopped for registered events of the channel.
1257 * Returns size of returned session payload data or a negative error code.
2ef84c95 1258 */
cd80958d 1259int lttng_disable_channel(struct lttng_handle *handle, const char *name)
2ef84c95 1260{
cd80958d
DG
1261 struct lttcomm_session_msg lsm;
1262
9d697d3d
DG
1263 /* Safety check. Both are mandatory */
1264 if (handle == NULL || name == NULL) {
2f70b271 1265 return -LTTNG_ERR_INVALID;
cd80958d
DG
1266 }
1267
441c16a7
MD
1268 memset(&lsm, 0, sizeof(lsm));
1269
cd80958d 1270 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1df4dedd 1271
cac3069d 1272 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
9d697d3d
DG
1273 sizeof(lsm.u.disable.channel_name));
1274
cac3069d 1275 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
cd80958d 1276
cac3069d 1277 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d
DG
1278 sizeof(lsm.session.name));
1279
cac3069d 1280 return lttng_ctl_ask_sessiond(&lsm, NULL);
ca95a216
DG
1281}
1282
ccf10263
MD
1283/*
1284 * Add PID to session tracker.
1285 * Return 0 on success else a negative LTTng error code.
1286 */
1287int lttng_track_pid(struct lttng_handle *handle, int pid)
1288{
1289 struct lttcomm_session_msg lsm;
1290
1291 /*
1292 * NULL arguments are forbidden. No default values.
1293 */
1294 if (handle == NULL) {
1295 return -LTTNG_ERR_INVALID;
1296 }
1297
1298 memset(&lsm, 0, sizeof(lsm));
1299
1300 lsm.cmd_type = LTTNG_TRACK_PID;
1301 lsm.u.pid_tracker.pid = pid;
1302
1303 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1304
1305 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1306 sizeof(lsm.session.name));
1307
1308 return lttng_ctl_ask_sessiond(&lsm, NULL);
1309}
1310
1311/*
1312 * Remove PID from session tracker.
1313 * Return 0 on success else a negative LTTng error code.
1314 */
1315int lttng_untrack_pid(struct lttng_handle *handle, int pid)
1316{
1317 struct lttcomm_session_msg lsm;
1318
1319 /*
1320 * NULL arguments are forbidden. No default values.
1321 */
1322 if (handle == NULL) {
1323 return -LTTNG_ERR_INVALID;
1324 }
1325
1326 memset(&lsm, 0, sizeof(lsm));
1327
1328 lsm.cmd_type = LTTNG_UNTRACK_PID;
1329 lsm.u.pid_tracker.pid = pid;
1330
1331 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1332
1333 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1334 sizeof(lsm.session.name));
1335
1336 return lttng_ctl_ask_sessiond(&lsm, NULL);
1337}
1338
fac6795d 1339/*
1c8d13c8
TD
1340 * Lists all available tracepoints of domain.
1341 * Sets the contents of the events array.
1342 * Returns the number of lttng_event entries in events;
1343 * on error, returns a negative value.
fac6795d 1344 */
cd80958d 1345int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 1346 struct lttng_event **events)
fac6795d 1347{
052da939 1348 int ret;
cd80958d
DG
1349 struct lttcomm_session_msg lsm;
1350
9d697d3d 1351 if (handle == NULL) {
2f70b271 1352 return -LTTNG_ERR_INVALID;
cd80958d 1353 }
fac6795d 1354
53efb85a 1355 memset(&lsm, 0, sizeof(lsm));
cd80958d 1356 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
cac3069d 1357 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
2a71efd5 1358
cac3069d 1359 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
052da939
DG
1360 if (ret < 0) {
1361 return ret;
eb354453 1362 }
fac6795d 1363
9f19cc17 1364 return ret / sizeof(struct lttng_event);
fac6795d
DG
1365}
1366
f37d259d
MD
1367/*
1368 * Lists all available tracepoint fields of domain.
1369 * Sets the contents of the event field array.
1370 * Returns the number of lttng_event_field entries in events;
1371 * on error, returns a negative value.
1372 */
1373int lttng_list_tracepoint_fields(struct lttng_handle *handle,
1374 struct lttng_event_field **fields)
1375{
1376 int ret;
1377 struct lttcomm_session_msg lsm;
1378
1379 if (handle == NULL) {
2f70b271 1380 return -LTTNG_ERR_INVALID;
f37d259d
MD
1381 }
1382
53efb85a 1383 memset(&lsm, 0, sizeof(lsm));
f37d259d 1384 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
cac3069d 1385 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
f37d259d 1386
cac3069d 1387 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
f37d259d
MD
1388 if (ret < 0) {
1389 return ret;
1390 }
1391
1392 return ret / sizeof(struct lttng_event_field);
1393}
1394
834978fd
DG
1395/*
1396 * Lists all available kernel system calls. Allocates and sets the contents of
1397 * the events array.
1398 *
1399 * Returns the number of lttng_event entries in events; on error, returns a
1400 * negative value.
1401 */
1402int lttng_list_syscalls(struct lttng_event **events)
1403{
1404 int ret;
1405 struct lttcomm_session_msg lsm;
1406
1407 if (!events) {
1408 return -LTTNG_ERR_INVALID;
1409 }
1410
1411 memset(&lsm, 0, sizeof(lsm));
1412 lsm.cmd_type = LTTNG_LIST_SYSCALLS;
1413 /* Force kernel domain for system calls. */
1414 lsm.domain.type = LTTNG_DOMAIN_KERNEL;
1415
1416 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
1417 if (ret < 0) {
1418 return ret;
1419 }
1420
1421 return ret / sizeof(struct lttng_event);
1422}
1423
1657e9bb 1424/*
1c8d13c8
TD
1425 * Returns a human readable string describing
1426 * the error code (a negative value).
1657e9bb 1427 */
9a745bc7 1428const char *lttng_strerror(int code)
1657e9bb 1429{
f73fabfd 1430 return error_get_str(code);
1657e9bb
DG
1431}
1432
aaf97519 1433/*
a4b92340
DG
1434 * Create a brand new session using name and url for destination.
1435 *
f73fabfd 1436 * Returns LTTNG_OK on success or a negative error code.
00e2e675 1437 */
a4b92340 1438int lttng_create_session(const char *name, const char *url)
00e2e675 1439{
3dd05a85 1440 int ret;
a4b92340 1441 ssize_t size;
00e2e675 1442 struct lttcomm_session_msg lsm;
a4b92340 1443 struct lttng_uri *uris = NULL;
00e2e675 1444
a4b92340 1445 if (name == NULL) {
2f70b271 1446 return -LTTNG_ERR_INVALID;
00e2e675
DG
1447 }
1448
a4b92340 1449 memset(&lsm, 0, sizeof(lsm));
00e2e675 1450
a4b92340 1451 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1452 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
a4b92340
DG
1453
1454 /* There should never be a data URL */
bc894455 1455 size = uri_parse_str_urls(url, NULL, &uris);
a4b92340 1456 if (size < 0) {
2f70b271 1457 return -LTTNG_ERR_INVALID;
00e2e675
DG
1458 }
1459
a4b92340
DG
1460 lsm.u.uri.size = size;
1461
cac3069d
DG
1462 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1463 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1464
1465 free(uris);
1466 return ret;
00e2e675
DG
1467}
1468
8028d920 1469/*
8028d920 1470 * Destroy session using name.
1c8d13c8 1471 * Returns size of returned session payload data or a negative error code.
8028d920 1472 */
843f5df9 1473int lttng_destroy_session(const char *session_name)
8028d920 1474{
cd80958d
DG
1475 struct lttcomm_session_msg lsm;
1476
843f5df9 1477 if (session_name == NULL) {
2f70b271 1478 return -LTTNG_ERR_INVALID;
cd80958d
DG
1479 }
1480
53efb85a 1481 memset(&lsm, 0, sizeof(lsm));
cd80958d 1482 lsm.cmd_type = LTTNG_DESTROY_SESSION;
843f5df9 1483
cac3069d
DG
1484 lttng_ctl_copy_string(lsm.session.name, session_name,
1485 sizeof(lsm.session.name));
cd80958d 1486
cac3069d 1487 return lttng_ctl_ask_sessiond(&lsm, NULL);
aaf97519
DG
1488}
1489
57167058 1490/*
57167058 1491 * Ask the session daemon for all available sessions.
1c8d13c8
TD
1492 * Sets the contents of the sessions array.
1493 * Returns the number of lttng_session entries in sessions;
1494 * on error, returns a negative value.
57167058 1495 */
ca95a216 1496int lttng_list_sessions(struct lttng_session **sessions)
57167058 1497{
ca95a216 1498 int ret;
cd80958d 1499 struct lttcomm_session_msg lsm;
57167058 1500
53efb85a 1501 memset(&lsm, 0, sizeof(lsm));
cd80958d 1502 lsm.cmd_type = LTTNG_LIST_SESSIONS;
cac3069d 1503 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
57167058 1504 if (ret < 0) {
ca95a216 1505 return ret;
57167058
DG
1506 }
1507
ca95a216 1508 return ret / sizeof(struct lttng_session);
57167058
DG
1509}
1510
d7ba1388
MD
1511int lttng_set_session_shm_path(const char *session_name,
1512 const char *shm_path)
1513{
1514 struct lttcomm_session_msg lsm;
1515
1516 if (session_name == NULL) {
1517 return -LTTNG_ERR_INVALID;
1518 }
1519
1520 memset(&lsm, 0, sizeof(lsm));
1521 lsm.cmd_type = LTTNG_SET_SESSION_SHM_PATH;
1522
1523 lttng_ctl_copy_string(lsm.session.name, session_name,
1524 sizeof(lsm.session.name));
1525 lttng_ctl_copy_string(lsm.u.set_shm_path.shm_path, shm_path,
1526 sizeof(lsm.u.set_shm_path.shm_path));
1527
1528 return lttng_ctl_ask_sessiond(&lsm, NULL);
1529}
1530
9f19cc17 1531/*
1c8d13c8
TD
1532 * Ask the session daemon for all available domains of a session.
1533 * Sets the contents of the domains array.
1534 * Returns the number of lttng_domain entries in domains;
1535 * on error, returns a negative value.
9f19cc17 1536 */
330be774 1537int lttng_list_domains(const char *session_name,
cd80958d 1538 struct lttng_domain **domains)
9f19cc17
DG
1539{
1540 int ret;
cd80958d
DG
1541 struct lttcomm_session_msg lsm;
1542
330be774 1543 if (session_name == NULL) {
2f70b271 1544 return -LTTNG_ERR_INVALID;
cd80958d 1545 }
9f19cc17 1546
53efb85a 1547 memset(&lsm, 0, sizeof(lsm));
cd80958d
DG
1548 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1549
cac3069d
DG
1550 lttng_ctl_copy_string(lsm.session.name, session_name,
1551 sizeof(lsm.session.name));
cd80958d 1552
cac3069d 1553 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
9f19cc17
DG
1554 if (ret < 0) {
1555 return ret;
1556 }
1557
1558 return ret / sizeof(struct lttng_domain);
1559}
1560
1561/*
1c8d13c8
TD
1562 * Ask the session daemon for all available channels of a session.
1563 * Sets the contents of the channels array.
1564 * Returns the number of lttng_channel entries in channels;
1565 * on error, returns a negative value.
9f19cc17 1566 */
cd80958d
DG
1567int lttng_list_channels(struct lttng_handle *handle,
1568 struct lttng_channel **channels)
9f19cc17
DG
1569{
1570 int ret;
cd80958d
DG
1571 struct lttcomm_session_msg lsm;
1572
9d697d3d 1573 if (handle == NULL) {
2f70b271 1574 return -LTTNG_ERR_INVALID;
cd80958d
DG
1575 }
1576
53efb85a 1577 memset(&lsm, 0, sizeof(lsm));
cd80958d 1578 lsm.cmd_type = LTTNG_LIST_CHANNELS;
cac3069d 1579 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1580 sizeof(lsm.session.name));
9f19cc17 1581
cac3069d 1582 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1583
cac3069d 1584 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
9f19cc17
DG
1585 if (ret < 0) {
1586 return ret;
1587 }
1588
1589 return ret / sizeof(struct lttng_channel);
1590}
1591
1592/*
1c8d13c8
TD
1593 * Ask the session daemon for all available events of a session channel.
1594 * Sets the contents of the events array.
1595 * Returns the number of lttng_event entries in events;
1596 * on error, returns a negative value.
9f19cc17 1597 */
cd80958d
DG
1598int lttng_list_events(struct lttng_handle *handle,
1599 const char *channel_name, struct lttng_event **events)
9f19cc17
DG
1600{
1601 int ret;
cd80958d 1602 struct lttcomm_session_msg lsm;
9f19cc17 1603
9d697d3d
DG
1604 /* Safety check. An handle and channel name are mandatory */
1605 if (handle == NULL || channel_name == NULL) {
2f70b271 1606 return -LTTNG_ERR_INVALID;
cd80958d
DG
1607 }
1608
53efb85a 1609 memset(&lsm, 0, sizeof(lsm));
cd80958d 1610 lsm.cmd_type = LTTNG_LIST_EVENTS;
cac3069d 1611 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
cd80958d 1612 sizeof(lsm.session.name));
cac3069d 1613 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
cd80958d
DG
1614 sizeof(lsm.u.list.channel_name));
1615
cac3069d 1616 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
9f19cc17 1617
cac3069d 1618 ret = lttng_ctl_ask_sessiond(&lsm, (void**) events);
9f19cc17
DG
1619 if (ret < 0) {
1620 return ret;
1621 }
1622
1623 return ret / sizeof(struct lttng_event);
1624}
1625
fac6795d 1626/*
1c8d13c8
TD
1627 * Sets the tracing_group variable with name.
1628 * This function allocates memory pointed to by tracing_group.
1629 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
fac6795d
DG
1630 */
1631int lttng_set_tracing_group(const char *name)
1632{
9d697d3d 1633 if (name == NULL) {
2f70b271 1634 return -LTTNG_ERR_INVALID;
9d697d3d
DG
1635 }
1636
fac6795d 1637 if (asprintf(&tracing_group, "%s", name) < 0) {
2f70b271 1638 return -LTTNG_ERR_FATAL;
fac6795d
DG
1639 }
1640
1641 return 0;
1642}
1643
d0254c7c 1644/*
af87c45a 1645 * Returns size of returned session payload data or a negative error code.
d0254c7c 1646 */
cd80958d 1647int lttng_calibrate(struct lttng_handle *handle,
d0254c7c
MD
1648 struct lttng_calibrate *calibrate)
1649{
cd80958d 1650 struct lttcomm_session_msg lsm;
d0254c7c 1651
9d697d3d
DG
1652 /* Safety check. NULL pointer are forbidden */
1653 if (handle == NULL || calibrate == NULL) {
2f70b271 1654 return -LTTNG_ERR_INVALID;
cd80958d 1655 }
d0254c7c 1656
53efb85a 1657 memset(&lsm, 0, sizeof(lsm));
cd80958d 1658 lsm.cmd_type = LTTNG_CALIBRATE;
cac3069d 1659 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
d0254c7c 1660
cd80958d
DG
1661 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
1662
cac3069d 1663 return lttng_ctl_ask_sessiond(&lsm, NULL);
d0254c7c
MD
1664}
1665
5edd7e09
DG
1666/*
1667 * Set default channel attributes.
441c16a7 1668 * If either or both of the arguments are null, attr content is zeroe'd.
5edd7e09
DG
1669 */
1670void lttng_channel_set_default_attr(struct lttng_domain *domain,
1671 struct lttng_channel_attr *attr)
1672{
1673 /* Safety check */
1674 if (attr == NULL || domain == NULL) {
1675 return;
1676 }
1677
eacaa7a6
DS
1678 memset(attr, 0, sizeof(struct lttng_channel_attr));
1679
0a9c6494
DG
1680 /* Same for all domains. */
1681 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
1682 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
1683 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
1684
5edd7e09
DG
1685 switch (domain->type) {
1686 case LTTNG_DOMAIN_KERNEL:
d92ff3ef
DG
1687 attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
1688 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
3e230f92 1689 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
5edd7e09
DG
1690 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
1691 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1692 break;
1693 case LTTNG_DOMAIN_UST:
0a9c6494
DG
1694 switch (domain->buf_type) {
1695 case LTTNG_BUFFER_PER_UID:
1696 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
1697 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
1698 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
1699 attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
1700 attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER;
1701 break;
1702 case LTTNG_BUFFER_PER_PID:
1703 default:
1704 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
1705 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
1706 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
1707 attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
1708 attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER;
1709 break;
1710 }
5edd7e09 1711 default:
441c16a7 1712 /* Default behavior: leave set to 0. */
5edd7e09
DG
1713 break;
1714 }
1715}
1716
fac6795d 1717/*
2269e89e 1718 * Check if session daemon is alive.
fac6795d 1719 *
2269e89e 1720 * Return 1 if alive or 0 if not.
1c8d13c8 1721 * On error returns a negative value.
fac6795d 1722 */
947308c4 1723int lttng_session_daemon_alive(void)
fac6795d
DG
1724{
1725 int ret;
1726
1727 ret = set_session_daemon_path();
1728 if (ret < 0) {
947308c4 1729 /* Error */
fac6795d
DG
1730 return ret;
1731 }
1732
9d035200 1733 if (*sessiond_sock_path == '\0') {
2f70b271
DG
1734 /*
1735 * No socket path set. Weird error which means the constructor was not
1736 * called.
1737 */
1738 assert(0);
fac6795d
DG
1739 }
1740
2269e89e 1741 ret = try_connect_sessiond(sessiond_sock_path);
7d8234d9
MD
1742 if (ret < 0) {
1743 /* Not alive */
1744 return 0;
1745 }
7d8234d9 1746
947308c4
DG
1747 /* Is alive */
1748 return 1;
fac6795d
DG
1749}
1750
00e2e675 1751/*
a4b92340 1752 * Set URL for a consumer for a session and domain.
00e2e675
DG
1753 *
1754 * Return 0 on success, else a negative value.
1755 */
a4b92340
DG
1756int lttng_set_consumer_url(struct lttng_handle *handle,
1757 const char *control_url, const char *data_url)
00e2e675 1758{
3dd05a85 1759 int ret;
a4b92340 1760 ssize_t size;
00e2e675 1761 struct lttcomm_session_msg lsm;
a4b92340 1762 struct lttng_uri *uris = NULL;
00e2e675 1763
a4b92340 1764 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
2f70b271 1765 return -LTTNG_ERR_INVALID;
00e2e675
DG
1766 }
1767
a4b92340
DG
1768 memset(&lsm, 0, sizeof(lsm));
1769
00e2e675
DG
1770 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
1771
cac3069d 1772 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
00e2e675 1773 sizeof(lsm.session.name));
cac3069d 1774 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
00e2e675 1775
bc894455 1776 size = uri_parse_str_urls(control_url, data_url, &uris);
a4b92340 1777 if (size < 0) {
2f70b271 1778 return -LTTNG_ERR_INVALID;
a4b92340
DG
1779 }
1780
1781 lsm.u.uri.size = size;
00e2e675 1782
cac3069d
DG
1783 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1784 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
DG
1785
1786 free(uris);
1787 return ret;
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1788}
1789
1790/*
9c6bda17 1791 * [OBSOLETE]
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1792 */
1793int lttng_enable_consumer(struct lttng_handle *handle)
1794{
785d2d0d 1795 return -ENOSYS;
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1796}
1797
1798/*
9c6bda17 1799 * [OBSOLETE]
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1800 */
1801int lttng_disable_consumer(struct lttng_handle *handle)
1802{
785d2d0d 1803 return -ENOSYS;
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1804}
1805
07424f16
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1806/*
1807 * This is an extension of create session that is ONLY and SHOULD only be used
1808 * by the lttng command line program. It exists to avoid using URI parsing in
1809 * the lttng client.
1810 *
1811 * We need the date and time for the trace path subdirectory for the case where
1812 * the user does NOT define one using either -o or -U. Using the normal
1813 * lttng_create_session API call, we have no clue on the session daemon side if
1814 * the URL was generated automatically by the client or define by the user.
1815 *
1816 * So this function "wrapper" is hidden from the public API, takes the datetime
1817 * string and appends it if necessary to the URI subdirectory before sending it
1818 * to the session daemon.
1819 *
1820 * With this extra function, the lttng_create_session call behavior is not
1821 * changed and the timestamp is appended to the URI on the session daemon side
1822 * if necessary.
1823 */
1824int _lttng_create_session_ext(const char *name, const char *url,
1825 const char *datetime)
1826{
3dd05a85 1827 int ret;
07424f16
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1828 ssize_t size;
1829 struct lttcomm_session_msg lsm;
1830 struct lttng_uri *uris = NULL;
1831
2bba9e53 1832 if (name == NULL || datetime == NULL) {
2f70b271 1833 return -LTTNG_ERR_INVALID;
07424f16
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1834 }
1835
1836 memset(&lsm, 0, sizeof(lsm));
1837
1838 lsm.cmd_type = LTTNG_CREATE_SESSION;
cac3069d 1839 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
07424f16
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1840
1841 /* There should never be a data URL */
bc894455 1842 size = uri_parse_str_urls(url, NULL, &uris);
07424f16 1843 if (size < 0) {
3dd05a85
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1844 ret = -LTTNG_ERR_INVALID;
1845 goto error;
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1846 }
1847
1848 lsm.u.uri.size = size;
1849
4b35a6b3 1850 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
da4aa2b8
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1851 /* Don't append datetime if the name was automatically created. */
1852 if (strncmp(name, DEFAULT_SESSION_NAME "-",
1853 strlen(DEFAULT_SESSION_NAME) + 1)) {
1854 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
1855 name, datetime);
1856 } else {
1857 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
1858 }
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1859 if (ret < 0) {
1860 PERROR("snprintf uri subdir");
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1861 ret = -LTTNG_ERR_FATAL;
1862 goto error;
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1863 }
1864 }
1865
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1866 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1867 sizeof(struct lttng_uri) * size, NULL);
3dd05a85
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1868
1869error:
1870 free(uris);
1871 return ret;
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1872}
1873
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1874/*
1875 * For a given session name, this call checks if the data is ready to be read
1876 * or is still being extracted by the consumer(s) hence not ready to be used by
1877 * any readers.
1878 */
6d805429 1879int lttng_data_pending(const char *session_name)
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1880{
1881 int ret;
1882 struct lttcomm_session_msg lsm;
1883
1884 if (session_name == NULL) {
1885 return -LTTNG_ERR_INVALID;
1886 }
1887
53efb85a 1888 memset(&lsm, 0, sizeof(lsm));
6d805429 1889 lsm.cmd_type = LTTNG_DATA_PENDING;
806e2684 1890
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1891 lttng_ctl_copy_string(lsm.session.name, session_name,
1892 sizeof(lsm.session.name));
806e2684 1893
cac3069d 1894 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
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1895
1896 /*
cac3069d
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1897 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1898 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1899 * that the data is available. Yes it is hackish but for now this is the
1900 * only way.
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1901 */
1902 if (ret == -1) {
1903 ret = 1;
1904 }
1905
1906 return ret;
1907}
1908
27babd3a
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1909/*
1910 * Create a session exclusively used for snapshot.
1911 *
1912 * Returns LTTNG_OK on success or a negative error code.
1913 */
1914int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
1915{
1916 int ret;
1917 ssize_t size;
1918 struct lttcomm_session_msg lsm;
1919 struct lttng_uri *uris = NULL;
1920
1921 if (name == NULL) {
1922 return -LTTNG_ERR_INVALID;
1923 }
1924
1925 memset(&lsm, 0, sizeof(lsm));
1926
1927 lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
1928 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1929
1930 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
1931 if (size < 0) {
1932 return -LTTNG_ERR_INVALID;
1933 }
1934
1935 lsm.u.uri.size = size;
1936
1937 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1938 sizeof(struct lttng_uri) * size, NULL);
1939
1940 free(uris);
1941 return ret;
1942}
1943
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1944/*
1945 * Create a session exclusively used for live.
1946 *
1947 * Returns LTTNG_OK on success or a negative error code.
1948 */
1949int lttng_create_session_live(const char *name, const char *url,
1950 unsigned int timer_interval)
1951{
1952 int ret;
1953 ssize_t size;
1954 struct lttcomm_session_msg lsm;
1955 struct lttng_uri *uris = NULL;
1956
1957 if (name == NULL) {
1958 return -LTTNG_ERR_INVALID;
1959 }
1960
1961 memset(&lsm, 0, sizeof(lsm));
1962
1963 lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE;
1964 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1965
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1966 if (url) {
1967 size = uri_parse_str_urls(url, NULL, &uris);
1968 if (size <= 0) {
1969 ret = -LTTNG_ERR_INVALID;
1970 goto end;
1971 }
ecc48a90 1972
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1973 /* file:// is not accepted for live session. */
1974 if (uris[0].dtype == LTTNG_DST_PATH) {
1975 ret = -LTTNG_ERR_INVALID;
1976 goto end;
1977 }
1978 } else {
1979 size = 0;
ecc48a90
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1980 }
1981
1982 lsm.u.session_live.nb_uri = size;
1983 lsm.u.session_live.timer_interval = timer_interval;
1984
1985 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1986 sizeof(struct lttng_uri) * size, NULL);
1987
1988end:
1989 free(uris);
1990 return ret;
1991}
1992
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1993/*
1994 * lib constructor
1995 */
1996static void __attribute__((constructor)) init()
1997{
1998 /* Set default session group */
bbccc3d2 1999 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
fac6795d 2000}
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2001
2002/*
2003 * lib destructor
2004 */
2005static void __attribute__((destructor)) lttng_ctl_exit()
2006{
2007 free(tracing_group);
2008}
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