Fix: check malloc return value
[lttng-tools.git] / src / lib / lttng-ctl / lttng-ctl.c
1 /*
2 * liblttngctl.c
3 *
4 * Linux Trace Toolkit Control Library
5 *
6 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
7 *
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.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
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
20 */
21
22 #define _GNU_SOURCE
23 #include <assert.h>
24 #include <grp.h>
25 #include <errno.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <unistd.h>
30
31 #include <common/common.h>
32 #include <common/defaults.h>
33 #include <common/sessiond-comm/sessiond-comm.h>
34 #include <common/uri.h>
35 #include <common/utils.h>
36 #include <lttng/lttng.h>
37 #include <lttng/health-internal.h>
38
39 #include "filter/filter-ast.h"
40 #include "filter/filter-parser.h"
41 #include "filter/filter-bytecode.h"
42 #include "filter/memstream.h"
43 #include "lttng-ctl-helper.h"
44
45 #ifdef DEBUG
46 static const int print_xml = 1;
47 #define dbg_printf(fmt, args...) \
48 printf("[debug liblttng-ctl] " fmt, ## args)
49 #else
50 static const int print_xml = 0;
51 #define dbg_printf(fmt, args...) \
52 do { \
53 /* do nothing but check printf format */ \
54 if (0) \
55 printf("[debug liblttnctl] " fmt, ## args); \
56 } while (0)
57 #endif
58
59
60 /* Socket to session daemon for communication */
61 static int sessiond_socket;
62 static char sessiond_sock_path[PATH_MAX];
63
64 /* Variables */
65 static char *tracing_group;
66 static int connected;
67
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.
74 */
75 int lttng_opt_quiet;
76 int lttng_opt_verbose;
77
78 /*
79 * Copy string from src to dst and enforce null terminated byte.
80 */
81 LTTNG_HIDDEN
82 void lttng_ctl_copy_string(char *dst, const char *src, size_t len)
83 {
84 if (src && dst) {
85 strncpy(dst, src, len);
86 /* Enforce the NULL terminated byte */
87 dst[len - 1] = '\0';
88 } else if (dst) {
89 dst[0] = '\0';
90 }
91 }
92
93 /*
94 * Copy domain to lttcomm_session_msg domain.
95 *
96 * If domain is unknown, default domain will be the kernel.
97 */
98 LTTNG_HIDDEN
99 void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
100 struct lttng_domain *src)
101 {
102 if (src && dst) {
103 switch (src->type) {
104 case LTTNG_DOMAIN_KERNEL:
105 case LTTNG_DOMAIN_UST:
106 case LTTNG_DOMAIN_JUL:
107 memcpy(dst, src, sizeof(struct lttng_domain));
108 break;
109 default:
110 memset(dst, 0, sizeof(struct lttng_domain));
111 break;
112 }
113 }
114 }
115
116 /*
117 * Send lttcomm_session_msg to the session daemon.
118 *
119 * On success, returns the number of bytes sent (>=0)
120 * On error, returns -1
121 */
122 static int send_session_msg(struct lttcomm_session_msg *lsm)
123 {
124 int ret;
125
126 if (!connected) {
127 ret = -LTTNG_ERR_NO_SESSIOND;
128 goto end;
129 }
130
131 DBG("LSM cmd type : %d", lsm->cmd_type);
132
133 ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
134 sizeof(struct lttcomm_session_msg));
135 if (ret < 0) {
136 ret = -LTTNG_ERR_FATAL;
137 }
138
139 end:
140 return ret;
141 }
142
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 */
149 static int send_session_varlen(void *data, size_t len)
150 {
151 int ret;
152
153 if (!connected) {
154 ret = -LTTNG_ERR_NO_SESSIOND;
155 goto end;
156 }
157
158 if (!data || !len) {
159 ret = 0;
160 goto end;
161 }
162
163 ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
164 if (ret < 0) {
165 ret = -LTTNG_ERR_FATAL;
166 }
167
168 end:
169 return ret;
170 }
171
172 /*
173 * Receive data from the sessiond socket.
174 *
175 * On success, returns the number of bytes received (>=0)
176 * On error, returns -1 (recvmsg() error) or -ENOTCONN
177 */
178 static int recv_data_sessiond(void *buf, size_t len)
179 {
180 int ret;
181
182 if (!connected) {
183 ret = -LTTNG_ERR_NO_SESSIOND;
184 goto end;
185 }
186
187 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
188 if (ret < 0) {
189 ret = -LTTNG_ERR_FATAL;
190 }
191
192 end:
193 return ret;
194 }
195
196 /*
197 * Check if we are in the specified group.
198 *
199 * If yes return 1, else return -1.
200 */
201 LTTNG_HIDDEN
202 int lttng_check_tracing_group(void)
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;
208 const char *grp_name = tracing_group;
209
210 /* Get GID of group 'tracing' */
211 grp_tracing = getgrnam(grp_name);
212 if (!grp_tracing) {
213 /* If grp_tracing is NULL, the group does not exist. */
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));
226 if (!grp_list) {
227 perror("malloc");
228 goto end;
229 }
230 grp_id = getgroups(grp_list_size, grp_list);
231 if (grp_id < 0) {
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) {
238 ret = 1;
239 break;
240 }
241 }
242
243 free_list:
244 free(grp_list);
245
246 end:
247 return ret;
248 }
249
250 /*
251 * Try connect to session daemon with sock_path.
252 *
253 * Return 0 on success, else -1
254 */
255 static 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 */
263 goto error;
264 }
265
266 ret = lttcomm_connect_unix_sock(sock_path);
267 if (ret < 0) {
268 /* Not alive */
269 goto error;
270 }
271
272 ret = lttcomm_close_unix_sock(ret);
273 if (ret < 0) {
274 perror("lttcomm_close_unix_sock");
275 }
276
277 return 0;
278
279 error:
280 return -1;
281 }
282
283 /*
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).
289 */
290 static int set_session_daemon_path(void)
291 {
292 int in_tgroup = 0; /* In tracing group */
293 uid_t uid;
294
295 uid = getuid();
296
297 if (uid != 0) {
298 /* Are we in the tracing group ? */
299 in_tgroup = lttng_check_tracing_group();
300 }
301
302 if ((uid == 0) || in_tgroup) {
303 lttng_ctl_copy_string(sessiond_sock_path,
304 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path));
305 }
306
307 if (uid != 0) {
308 int ret;
309
310 if (in_tgroup) {
311 /* Tracing group */
312 ret = try_connect_sessiond(sessiond_sock_path);
313 if (ret >= 0) {
314 goto end;
315 }
316 /* Global session daemon not available... */
317 }
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),
325 DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
326 if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
327 goto error;
328 }
329 }
330 end:
331 return 0;
332
333 error:
334 return -1;
335 }
336
337 /*
338 * Connect to the LTTng session daemon.
339 *
340 * On success, return 0. On error, return -1.
341 */
342 static int connect_sessiond(void)
343 {
344 int ret;
345
346 /* Don't try to connect if already connected. */
347 if (connected) {
348 return 0;
349 }
350
351 ret = set_session_daemon_path();
352 if (ret < 0) {
353 goto error;
354 }
355
356 /* Connect to the sesssion daemon */
357 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
358 if (ret < 0) {
359 goto error;
360 }
361
362 sessiond_socket = ret;
363 connected = 1;
364
365 return 0;
366
367 error:
368 return -1;
369 }
370
371 /*
372 * Clean disconnect from the session daemon.
373 * On success, return 0. On error, return -1.
374 */
375 static 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
388 /*
389 * Ask the session daemon a specific command and put the data into buf.
390 * Takes extra var. len. data as input to send to the session daemon.
391 *
392 * Return size of data (only payload, not header) or a negative error code.
393 */
394 LTTNG_HIDDEN
395 int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
396 void *vardata, size_t varlen, void **buf)
397 {
398 int ret;
399 size_t size;
400 void *data = NULL;
401 struct lttcomm_lttng_msg llm;
402
403 ret = connect_sessiond();
404 if (ret < 0) {
405 ret = -LTTNG_ERR_NO_SESSIOND;
406 goto end;
407 }
408
409 /* Send command to session daemon */
410 ret = send_session_msg(lsm);
411 if (ret < 0) {
412 /* Ret value is a valid lttng error code. */
413 goto end;
414 }
415 /* Send var len data */
416 ret = send_session_varlen(vardata, varlen);
417 if (ret < 0) {
418 /* Ret value is a valid lttng error code. */
419 goto end;
420 }
421
422 /* Get header from data transmission */
423 ret = recv_data_sessiond(&llm, sizeof(llm));
424 if (ret < 0) {
425 /* Ret value is a valid lttng error code. */
426 goto end;
427 }
428
429 /* Check error code if OK */
430 if (llm.ret_code != LTTNG_OK) {
431 ret = -llm.ret_code;
432 goto end;
433 }
434
435 size = llm.data_size;
436 if (size == 0) {
437 /* If client free with size 0 */
438 if (buf != NULL) {
439 *buf = NULL;
440 }
441 ret = 0;
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
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) {
459 ret = -LTTNG_ERR_INVALID;
460 free(data);
461 goto end;
462 }
463
464 *buf = data;
465 ret = size;
466
467 end:
468 disconnect_sessiond();
469 return ret;
470 }
471
472 /*
473 * Create lttng handle and return pointer.
474 * The returned pointer will be NULL in case of malloc() error.
475 */
476 struct lttng_handle *lttng_create_handle(const char *session_name,
477 struct lttng_domain *domain)
478 {
479 struct lttng_handle *handle = NULL;
480
481 if (domain == NULL) {
482 goto end;
483 }
484
485 handle = malloc(sizeof(struct lttng_handle));
486 if (handle == NULL) {
487 PERROR("malloc handle");
488 goto end;
489 }
490
491 /* Copy session name */
492 lttng_ctl_copy_string(handle->session_name, session_name,
493 sizeof(handle->session_name));
494
495 /* Copy lttng domain */
496 lttng_ctl_copy_lttng_domain(&handle->domain, domain);
497
498 end:
499 return handle;
500 }
501
502 /*
503 * Destroy handle by free(3) the pointer.
504 */
505 void lttng_destroy_handle(struct lttng_handle *handle)
506 {
507 free(handle);
508 }
509
510 /*
511 * Register an outside consumer.
512 * Returns size of returned session payload data or a negative error code.
513 */
514 int lttng_register_consumer(struct lttng_handle *handle,
515 const char *socket_path)
516 {
517 struct lttcomm_session_msg lsm;
518
519 if (handle == NULL || socket_path == NULL) {
520 return -LTTNG_ERR_INVALID;
521 }
522
523 memset(&lsm, 0, sizeof(lsm));
524 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
525 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
526 sizeof(lsm.session.name));
527 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
528
529 lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
530
531 return lttng_ctl_ask_sessiond(&lsm, NULL);
532 }
533
534 /*
535 * Start tracing for all traces of the session.
536 * Returns size of returned session payload data or a negative error code.
537 */
538 int lttng_start_tracing(const char *session_name)
539 {
540 struct lttcomm_session_msg lsm;
541
542 if (session_name == NULL) {
543 return -LTTNG_ERR_INVALID;
544 }
545
546 memset(&lsm, 0, sizeof(lsm));
547 lsm.cmd_type = LTTNG_START_TRACE;
548
549 lttng_ctl_copy_string(lsm.session.name, session_name,
550 sizeof(lsm.session.name));
551
552 return lttng_ctl_ask_sessiond(&lsm, NULL);
553 }
554
555 /*
556 * Stop tracing for all traces of the session.
557 */
558 static int _lttng_stop_tracing(const char *session_name, int wait)
559 {
560 int ret, data_ret;
561 struct lttcomm_session_msg lsm;
562
563 if (session_name == NULL) {
564 return -LTTNG_ERR_INVALID;
565 }
566
567 memset(&lsm, 0, sizeof(lsm));
568 lsm.cmd_type = LTTNG_STOP_TRACE;
569
570 lttng_ctl_copy_string(lsm.session.name, session_name,
571 sizeof(lsm.session.name));
572
573 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
574 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
575 goto error;
576 }
577
578 if (!wait) {
579 goto end;
580 }
581
582 /* Check for data availability */
583 do {
584 data_ret = lttng_data_pending(session_name);
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 */
595 if (data_ret) {
596 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
597 }
598 } while (data_ret != 0);
599
600 end:
601 error:
602 return ret;
603 }
604
605 /*
606 * Stop tracing and wait for data availability.
607 */
608 int 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 */
616 int lttng_stop_tracing_no_wait(const char *session_name)
617 {
618 return _lttng_stop_tracing(session_name, 0);
619 }
620
621 /*
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.
626 *
627 * Returns the size of the returned payload data or a negative error code.
628 */
629 int lttng_add_context(struct lttng_handle *handle,
630 struct lttng_event_context *ctx, const char *event_name,
631 const char *channel_name)
632 {
633 struct lttcomm_session_msg lsm;
634
635 /* Safety check. Both are mandatory */
636 if (handle == NULL || ctx == NULL) {
637 return -LTTNG_ERR_INVALID;
638 }
639
640 memset(&lsm, 0, sizeof(lsm));
641
642 lsm.cmd_type = LTTNG_ADD_CONTEXT;
643
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 }
652
653 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
654
655 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
656
657 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
658 sizeof(lsm.session.name));
659
660 return lttng_ctl_ask_sessiond(&lsm, NULL);
661 }
662
663 /*
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.
668 */
669 int lttng_enable_event(struct lttng_handle *handle,
670 struct lttng_event *ev, const char *channel_name)
671 {
672 return lttng_enable_event_with_exclusions(handle, ev, channel_name,
673 NULL, 0, NULL);
674 }
675
676 /*
677 * Create or enable an event with a filter expression.
678 *
679 * Return negative error value on error.
680 * Return size of returned session payload data if OK.
681 */
682 int lttng_enable_event_with_filter(struct lttng_handle *handle,
683 struct lttng_event *event, const char *channel_name,
684 const char *filter_expression)
685 {
686 return lttng_enable_event_with_exclusions(handle, event, channel_name,
687 filter_expression, 0, NULL);
688 }
689
690 /*
691 * Depending on the event, return a newly allocated JUL filter expression or
692 * NULL if not applicable.
693 *
694 * An event with NO loglevel and the name is * will return NULL.
695 */
696 static char *set_jul_filter(const char *filter, struct lttng_event *ev)
697 {
698 int err;
699 char *jul_filter = NULL;
700
701 assert(ev);
702
703 /* Don't add filter for the '*' event. */
704 if (ev->name[0] != '*') {
705 if (filter) {
706 err = asprintf(&jul_filter, "%s && logger_name == \"%s\"", filter,
707 ev->name);
708 } else {
709 err = asprintf(&jul_filter, "logger_name == \"%s\"", ev->name);
710 }
711 if (err < 0) {
712 PERROR("asprintf");
713 goto end;
714 }
715 }
716
717 /* Add loglevel filtering if any for the JUL domain. */
718 if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) {
719 char *op;
720
721 if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) {
722 op = ">=";
723 } else {
724 op = "==";
725 }
726
727 if (filter) {
728 err = asprintf(&jul_filter, "%s && int_loglevel %s %d", filter, op,
729 ev->loglevel);
730 } else {
731 err = asprintf(&jul_filter, "int_loglevel %s %d", op,
732 ev->loglevel);
733 }
734 if (err < 0) {
735 PERROR("asprintf");
736 free(jul_filter);
737 jul_filter = NULL;
738 goto end;
739 }
740 }
741
742 end:
743 return jul_filter;
744 }
745
746 /*
747 * Enable event(s) for a channel, possibly with exclusions and a filter.
748 * If no event name is specified, all events are enabled.
749 * If no channel name is specified, the default name is used.
750 * If filter expression is not NULL, the filter is set for the event.
751 * If exclusion count is not zero, the exclusions are set for the event.
752 * Returns size of returned session payload data or a negative error code.
753 */
754 int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
755 struct lttng_event *ev, const char *channel_name,
756 const char *filter_expression,
757 int exclusion_count, char **exclusion_list)
758 {
759 struct lttcomm_session_msg lsm;
760 char *varlen_data;
761 int ret = 0;
762 struct filter_parser_ctx *ctx = NULL;
763 FILE *fmem = NULL;
764
765 if (handle == NULL || ev == NULL) {
766 return -LTTNG_ERR_INVALID;
767 }
768
769 /* Empty filter string will always be rejected by the parser
770 * anyway, so treat this corner-case early to eliminate
771 * lttng_fmemopen error for 0-byte allocation.
772 */
773 if (filter_expression && filter_expression[0] == '\0') {
774 return -LTTNG_ERR_INVALID;
775 }
776
777 memset(&lsm, 0, sizeof(lsm));
778
779 /* If no channel name, send empty string. */
780 if (channel_name == NULL) {
781 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
782 sizeof(lsm.u.enable.channel_name));
783 } else {
784 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
785 sizeof(lsm.u.enable.channel_name));
786 }
787
788 if (ev->name[0] != '\0') {
789 lsm.cmd_type = LTTNG_ENABLE_EVENT;
790 } else {
791 lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
792 }
793
794 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
795 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
796
797 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
798 sizeof(lsm.session.name));
799 lsm.u.enable.exclusion_count = exclusion_count;
800 lsm.u.enable.bytecode_len = 0;
801
802 /*
803 * For the JUL domain, a filter is enforced except for the enable all
804 * event. This is done to avoid having the event in all sessions thus
805 * filtering by logger name.
806 */
807 if (exclusion_count == 0 && filter_expression == NULL &&
808 handle->domain.type != LTTNG_DOMAIN_JUL) {
809 goto ask_sessiond;
810 }
811
812 /*
813 * We have either a filter or some exclusions, so we need to set up
814 * a variable-length memory block from where to send the data
815 */
816
817 /* Parse filter expression */
818 if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL) {
819 if (handle->domain.type == LTTNG_DOMAIN_JUL) {
820 char *jul_filter;
821
822 /* Setup JUL filter if needed. */
823 jul_filter = set_jul_filter(filter_expression, ev);
824 if (!jul_filter) {
825 if (!filter_expression) {
826 /* No JUL and no filter, just skip everything below. */
827 goto ask_sessiond;
828 }
829 } else {
830 /*
831 * With a JUL filter, the original filter has been added to it
832 * thus replace the filter expression.
833 */
834 filter_expression = strdup(jul_filter);
835 free(jul_filter);
836 if (!filter_expression) {
837 return -LTTNG_ERR_FILTER_NOMEM;
838 }
839 }
840 }
841
842 /*
843 * casting const to non-const, as the underlying function will
844 * use it in read-only mode.
845 */
846 fmem = lttng_fmemopen((void *) filter_expression,
847 strlen(filter_expression), "r");
848 if (!fmem) {
849 fprintf(stderr, "Error opening memory as stream\n");
850 return -LTTNG_ERR_FILTER_NOMEM;
851 }
852 ctx = filter_parser_ctx_alloc(fmem);
853 if (!ctx) {
854 fprintf(stderr, "Error allocating parser\n");
855 ret = -LTTNG_ERR_FILTER_NOMEM;
856 goto filter_alloc_error;
857 }
858 ret = filter_parser_ctx_append_ast(ctx);
859 if (ret) {
860 fprintf(stderr, "Parse error\n");
861 ret = -LTTNG_ERR_FILTER_INVAL;
862 goto parse_error;
863 }
864 ret = filter_visitor_set_parent(ctx);
865 if (ret) {
866 fprintf(stderr, "Set parent error\n");
867 ret = -LTTNG_ERR_FILTER_INVAL;
868 goto parse_error;
869 }
870 if (print_xml) {
871 ret = filter_visitor_print_xml(ctx, stdout, 0);
872 if (ret) {
873 fflush(stdout);
874 fprintf(stderr, "XML print error\n");
875 ret = -LTTNG_ERR_FILTER_INVAL;
876 goto parse_error;
877 }
878 }
879
880 dbg_printf("Generating IR... ");
881 fflush(stdout);
882 ret = filter_visitor_ir_generate(ctx);
883 if (ret) {
884 fprintf(stderr, "Generate IR error\n");
885 ret = -LTTNG_ERR_FILTER_INVAL;
886 goto parse_error;
887 }
888 dbg_printf("done\n");
889
890 dbg_printf("Validating IR... ");
891 fflush(stdout);
892 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
893 if (ret) {
894 ret = -LTTNG_ERR_FILTER_INVAL;
895 goto parse_error;
896 }
897 dbg_printf("done\n");
898
899 dbg_printf("Generating bytecode... ");
900 fflush(stdout);
901 ret = filter_visitor_bytecode_generate(ctx);
902 if (ret) {
903 fprintf(stderr, "Generate bytecode error\n");
904 ret = -LTTNG_ERR_FILTER_INVAL;
905 goto parse_error;
906 }
907 dbg_printf("done\n");
908 dbg_printf("Size of bytecode generated: %u bytes.\n",
909 bytecode_get_len(&ctx->bytecode->b));
910
911 lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
912 + bytecode_get_len(&ctx->bytecode->b);
913 lsm.u.enable.expression_len = strlen(filter_expression) + 1;
914 }
915
916 varlen_data = zmalloc(lsm.u.enable.bytecode_len
917 + lsm.u.enable.expression_len
918 + LTTNG_SYMBOL_NAME_LEN * exclusion_count);
919 if (!varlen_data) {
920 ret = -LTTNG_ERR_EXCLUSION_NOMEM;
921 goto varlen_alloc_error;
922 }
923 /* Put exclusion names first in the data */
924 while (exclusion_count--) {
925 strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count,
926 *(exclusion_list + exclusion_count),
927 LTTNG_SYMBOL_NAME_LEN);
928 }
929 /* Add filter expression next */
930 if (lsm.u.enable.expression_len != 0) {
931 memcpy(varlen_data
932 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count,
933 filter_expression,
934 lsm.u.enable.expression_len);
935 }
936 /* Add filter bytecode next */
937 if (lsm.u.enable.bytecode_len != 0) {
938 memcpy(varlen_data
939 + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count
940 + lsm.u.enable.expression_len,
941 &ctx->bytecode->b,
942 lsm.u.enable.bytecode_len);
943 }
944
945 ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data,
946 (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) +
947 lsm.u.enable.bytecode_len + lsm.u.enable.expression_len,
948 NULL);
949 free(varlen_data);
950
951 varlen_alloc_error:
952 if (filter_expression) {
953 filter_bytecode_free(ctx);
954 filter_ir_free(ctx);
955 filter_parser_ctx_free(ctx);
956 if (fclose(fmem) != 0) {
957 perror("fclose");
958 }
959 }
960 return ret;
961
962 parse_error:
963 filter_bytecode_free(ctx);
964 filter_ir_free(ctx);
965 filter_parser_ctx_free(ctx);
966 filter_alloc_error:
967 if (fclose(fmem) != 0) {
968 perror("fclose");
969 }
970 return ret;
971
972 ask_sessiond:
973 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
974 return ret;
975 }
976
977 /*
978 * Disable event(s) of a channel and domain.
979 * If no event name is specified, all events are disabled.
980 * If no channel name is specified, the default 'channel0' is used.
981 * Returns size of returned session payload data or a negative error code.
982 */
983 int lttng_disable_event(struct lttng_handle *handle, const char *name,
984 const char *channel_name)
985 {
986 struct lttcomm_session_msg lsm;
987
988 if (handle == NULL) {
989 return -LTTNG_ERR_INVALID;
990 }
991
992 memset(&lsm, 0, sizeof(lsm));
993
994 /* If no channel name, send empty string. */
995 if (channel_name == NULL) {
996 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
997 sizeof(lsm.u.disable.channel_name));
998 } else {
999 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
1000 sizeof(lsm.u.disable.channel_name));
1001 }
1002
1003 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1004
1005 if (name != NULL) {
1006 lttng_ctl_copy_string(lsm.u.disable.name, name,
1007 sizeof(lsm.u.disable.name));
1008 lsm.cmd_type = LTTNG_DISABLE_EVENT;
1009 } else {
1010 lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
1011 }
1012
1013 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1014 sizeof(lsm.session.name));
1015
1016 return lttng_ctl_ask_sessiond(&lsm, NULL);
1017 }
1018
1019 /*
1020 * Enable channel per domain
1021 * Returns size of returned session payload data or a negative error code.
1022 */
1023 int lttng_enable_channel(struct lttng_handle *handle,
1024 struct lttng_channel *chan)
1025 {
1026 struct lttcomm_session_msg lsm;
1027
1028 /*
1029 * NULL arguments are forbidden. No default values.
1030 */
1031 if (handle == NULL || chan == NULL) {
1032 return -LTTNG_ERR_INVALID;
1033 }
1034
1035 memset(&lsm, 0, sizeof(lsm));
1036
1037 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
1038
1039 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
1040
1041 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1042
1043 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1044 sizeof(lsm.session.name));
1045
1046 return lttng_ctl_ask_sessiond(&lsm, NULL);
1047 }
1048
1049 /*
1050 * All tracing will be stopped for registered events of the channel.
1051 * Returns size of returned session payload data or a negative error code.
1052 */
1053 int lttng_disable_channel(struct lttng_handle *handle, const char *name)
1054 {
1055 struct lttcomm_session_msg lsm;
1056
1057 /* Safety check. Both are mandatory */
1058 if (handle == NULL || name == NULL) {
1059 return -LTTNG_ERR_INVALID;
1060 }
1061
1062 memset(&lsm, 0, sizeof(lsm));
1063
1064 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
1065
1066 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
1067 sizeof(lsm.u.disable.channel_name));
1068
1069 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1070
1071 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1072 sizeof(lsm.session.name));
1073
1074 return lttng_ctl_ask_sessiond(&lsm, NULL);
1075 }
1076
1077 /*
1078 * Lists all available tracepoints of domain.
1079 * Sets the contents of the events array.
1080 * Returns the number of lttng_event entries in events;
1081 * on error, returns a negative value.
1082 */
1083 int lttng_list_tracepoints(struct lttng_handle *handle,
1084 struct lttng_event **events)
1085 {
1086 int ret;
1087 struct lttcomm_session_msg lsm;
1088
1089 if (handle == NULL) {
1090 return -LTTNG_ERR_INVALID;
1091 }
1092
1093 memset(&lsm, 0, sizeof(lsm));
1094 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
1095 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1096
1097 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
1098 if (ret < 0) {
1099 return ret;
1100 }
1101
1102 return ret / sizeof(struct lttng_event);
1103 }
1104
1105 /*
1106 * Lists all available tracepoint fields of domain.
1107 * Sets the contents of the event field array.
1108 * Returns the number of lttng_event_field entries in events;
1109 * on error, returns a negative value.
1110 */
1111 int lttng_list_tracepoint_fields(struct lttng_handle *handle,
1112 struct lttng_event_field **fields)
1113 {
1114 int ret;
1115 struct lttcomm_session_msg lsm;
1116
1117 if (handle == NULL) {
1118 return -LTTNG_ERR_INVALID;
1119 }
1120
1121 memset(&lsm, 0, sizeof(lsm));
1122 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
1123 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1124
1125 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
1126 if (ret < 0) {
1127 return ret;
1128 }
1129
1130 return ret / sizeof(struct lttng_event_field);
1131 }
1132
1133 /*
1134 * Returns a human readable string describing
1135 * the error code (a negative value).
1136 */
1137 const char *lttng_strerror(int code)
1138 {
1139 return error_get_str(code);
1140 }
1141
1142 /*
1143 * Create a brand new session using name and url for destination.
1144 *
1145 * Returns LTTNG_OK on success or a negative error code.
1146 */
1147 int lttng_create_session(const char *name, const char *url)
1148 {
1149 int ret;
1150 ssize_t size;
1151 struct lttcomm_session_msg lsm;
1152 struct lttng_uri *uris = NULL;
1153
1154 if (name == NULL) {
1155 return -LTTNG_ERR_INVALID;
1156 }
1157
1158 memset(&lsm, 0, sizeof(lsm));
1159
1160 lsm.cmd_type = LTTNG_CREATE_SESSION;
1161 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1162
1163 /* There should never be a data URL */
1164 size = uri_parse_str_urls(url, NULL, &uris);
1165 if (size < 0) {
1166 return -LTTNG_ERR_INVALID;
1167 }
1168
1169 lsm.u.uri.size = size;
1170
1171 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1172 sizeof(struct lttng_uri) * size, NULL);
1173
1174 free(uris);
1175 return ret;
1176 }
1177
1178 /*
1179 * Destroy session using name.
1180 * Returns size of returned session payload data or a negative error code.
1181 */
1182 int lttng_destroy_session(const char *session_name)
1183 {
1184 struct lttcomm_session_msg lsm;
1185
1186 if (session_name == NULL) {
1187 return -LTTNG_ERR_INVALID;
1188 }
1189
1190 memset(&lsm, 0, sizeof(lsm));
1191 lsm.cmd_type = LTTNG_DESTROY_SESSION;
1192
1193 lttng_ctl_copy_string(lsm.session.name, session_name,
1194 sizeof(lsm.session.name));
1195
1196 return lttng_ctl_ask_sessiond(&lsm, NULL);
1197 }
1198
1199 /*
1200 * Ask the session daemon for all available sessions.
1201 * Sets the contents of the sessions array.
1202 * Returns the number of lttng_session entries in sessions;
1203 * on error, returns a negative value.
1204 */
1205 int lttng_list_sessions(struct lttng_session **sessions)
1206 {
1207 int ret;
1208 struct lttcomm_session_msg lsm;
1209
1210 memset(&lsm, 0, sizeof(lsm));
1211 lsm.cmd_type = LTTNG_LIST_SESSIONS;
1212 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
1213 if (ret < 0) {
1214 return ret;
1215 }
1216
1217 return ret / sizeof(struct lttng_session);
1218 }
1219
1220 /*
1221 * Ask the session daemon for all available domains of a session.
1222 * Sets the contents of the domains array.
1223 * Returns the number of lttng_domain entries in domains;
1224 * on error, returns a negative value.
1225 */
1226 int lttng_list_domains(const char *session_name,
1227 struct lttng_domain **domains)
1228 {
1229 int ret;
1230 struct lttcomm_session_msg lsm;
1231
1232 if (session_name == NULL) {
1233 return -LTTNG_ERR_INVALID;
1234 }
1235
1236 memset(&lsm, 0, sizeof(lsm));
1237 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1238
1239 lttng_ctl_copy_string(lsm.session.name, session_name,
1240 sizeof(lsm.session.name));
1241
1242 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
1243 if (ret < 0) {
1244 return ret;
1245 }
1246
1247 return ret / sizeof(struct lttng_domain);
1248 }
1249
1250 /*
1251 * Ask the session daemon for all available channels of a session.
1252 * Sets the contents of the channels array.
1253 * Returns the number of lttng_channel entries in channels;
1254 * on error, returns a negative value.
1255 */
1256 int lttng_list_channels(struct lttng_handle *handle,
1257 struct lttng_channel **channels)
1258 {
1259 int ret;
1260 struct lttcomm_session_msg lsm;
1261
1262 if (handle == NULL) {
1263 return -LTTNG_ERR_INVALID;
1264 }
1265
1266 memset(&lsm, 0, sizeof(lsm));
1267 lsm.cmd_type = LTTNG_LIST_CHANNELS;
1268 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1269 sizeof(lsm.session.name));
1270
1271 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1272
1273 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
1274 if (ret < 0) {
1275 return ret;
1276 }
1277
1278 return ret / sizeof(struct lttng_channel);
1279 }
1280
1281 /*
1282 * Ask the session daemon for all available events of a session channel.
1283 * Sets the contents of the events array.
1284 * Returns the number of lttng_event entries in events;
1285 * on error, returns a negative value.
1286 */
1287 int lttng_list_events(struct lttng_handle *handle,
1288 const char *channel_name, struct lttng_event **events)
1289 {
1290 int ret;
1291 struct lttcomm_session_msg lsm;
1292
1293 /* Safety check. An handle and channel name are mandatory */
1294 if (handle == NULL || channel_name == NULL) {
1295 return -LTTNG_ERR_INVALID;
1296 }
1297
1298 memset(&lsm, 0, sizeof(lsm));
1299 lsm.cmd_type = LTTNG_LIST_EVENTS;
1300 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1301 sizeof(lsm.session.name));
1302 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
1303 sizeof(lsm.u.list.channel_name));
1304
1305 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1306
1307 ret = lttng_ctl_ask_sessiond(&lsm, (void**) events);
1308 if (ret < 0) {
1309 return ret;
1310 }
1311
1312 return ret / sizeof(struct lttng_event);
1313 }
1314
1315 /*
1316 * Sets the tracing_group variable with name.
1317 * This function allocates memory pointed to by tracing_group.
1318 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
1319 */
1320 int lttng_set_tracing_group(const char *name)
1321 {
1322 if (name == NULL) {
1323 return -LTTNG_ERR_INVALID;
1324 }
1325
1326 if (asprintf(&tracing_group, "%s", name) < 0) {
1327 return -LTTNG_ERR_FATAL;
1328 }
1329
1330 return 0;
1331 }
1332
1333 /*
1334 * Returns size of returned session payload data or a negative error code.
1335 */
1336 int lttng_calibrate(struct lttng_handle *handle,
1337 struct lttng_calibrate *calibrate)
1338 {
1339 struct lttcomm_session_msg lsm;
1340
1341 /* Safety check. NULL pointer are forbidden */
1342 if (handle == NULL || calibrate == NULL) {
1343 return -LTTNG_ERR_INVALID;
1344 }
1345
1346 memset(&lsm, 0, sizeof(lsm));
1347 lsm.cmd_type = LTTNG_CALIBRATE;
1348 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1349
1350 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
1351
1352 return lttng_ctl_ask_sessiond(&lsm, NULL);
1353 }
1354
1355 /*
1356 * Set default channel attributes.
1357 * If either or both of the arguments are null, attr content is zeroe'd.
1358 */
1359 void lttng_channel_set_default_attr(struct lttng_domain *domain,
1360 struct lttng_channel_attr *attr)
1361 {
1362 /* Safety check */
1363 if (attr == NULL || domain == NULL) {
1364 return;
1365 }
1366
1367 memset(attr, 0, sizeof(struct lttng_channel_attr));
1368
1369 /* Same for all domains. */
1370 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
1371 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
1372 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
1373
1374 switch (domain->type) {
1375 case LTTNG_DOMAIN_KERNEL:
1376 attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
1377 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
1378 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
1379 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
1380 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1381 break;
1382 case LTTNG_DOMAIN_UST:
1383 switch (domain->buf_type) {
1384 case LTTNG_BUFFER_PER_UID:
1385 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
1386 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
1387 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
1388 attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
1389 attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER;
1390 break;
1391 case LTTNG_BUFFER_PER_PID:
1392 default:
1393 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
1394 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
1395 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
1396 attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
1397 attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER;
1398 break;
1399 }
1400 default:
1401 /* Default behavior: leave set to 0. */
1402 break;
1403 }
1404 }
1405
1406 /*
1407 * Check if session daemon is alive.
1408 *
1409 * Return 1 if alive or 0 if not.
1410 * On error returns a negative value.
1411 */
1412 int lttng_session_daemon_alive(void)
1413 {
1414 int ret;
1415
1416 ret = set_session_daemon_path();
1417 if (ret < 0) {
1418 /* Error */
1419 return ret;
1420 }
1421
1422 if (*sessiond_sock_path == '\0') {
1423 /*
1424 * No socket path set. Weird error which means the constructor was not
1425 * called.
1426 */
1427 assert(0);
1428 }
1429
1430 ret = try_connect_sessiond(sessiond_sock_path);
1431 if (ret < 0) {
1432 /* Not alive */
1433 return 0;
1434 }
1435
1436 /* Is alive */
1437 return 1;
1438 }
1439
1440 /*
1441 * Set URL for a consumer for a session and domain.
1442 *
1443 * Return 0 on success, else a negative value.
1444 */
1445 int lttng_set_consumer_url(struct lttng_handle *handle,
1446 const char *control_url, const char *data_url)
1447 {
1448 int ret;
1449 ssize_t size;
1450 struct lttcomm_session_msg lsm;
1451 struct lttng_uri *uris = NULL;
1452
1453 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
1454 return -LTTNG_ERR_INVALID;
1455 }
1456
1457 memset(&lsm, 0, sizeof(lsm));
1458
1459 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
1460
1461 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1462 sizeof(lsm.session.name));
1463 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1464
1465 size = uri_parse_str_urls(control_url, data_url, &uris);
1466 if (size < 0) {
1467 return -LTTNG_ERR_INVALID;
1468 }
1469
1470 lsm.u.uri.size = size;
1471
1472 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1473 sizeof(struct lttng_uri) * size, NULL);
1474
1475 free(uris);
1476 return ret;
1477 }
1478
1479 /*
1480 * [OBSOLETE]
1481 */
1482 int lttng_enable_consumer(struct lttng_handle *handle)
1483 {
1484 return -ENOSYS;
1485 }
1486
1487 /*
1488 * [OBSOLETE]
1489 */
1490 int lttng_disable_consumer(struct lttng_handle *handle)
1491 {
1492 return -ENOSYS;
1493 }
1494
1495 /*
1496 * This is an extension of create session that is ONLY and SHOULD only be used
1497 * by the lttng command line program. It exists to avoid using URI parsing in
1498 * the lttng client.
1499 *
1500 * We need the date and time for the trace path subdirectory for the case where
1501 * the user does NOT define one using either -o or -U. Using the normal
1502 * lttng_create_session API call, we have no clue on the session daemon side if
1503 * the URL was generated automatically by the client or define by the user.
1504 *
1505 * So this function "wrapper" is hidden from the public API, takes the datetime
1506 * string and appends it if necessary to the URI subdirectory before sending it
1507 * to the session daemon.
1508 *
1509 * With this extra function, the lttng_create_session call behavior is not
1510 * changed and the timestamp is appended to the URI on the session daemon side
1511 * if necessary.
1512 */
1513 int _lttng_create_session_ext(const char *name, const char *url,
1514 const char *datetime)
1515 {
1516 int ret;
1517 ssize_t size;
1518 struct lttcomm_session_msg lsm;
1519 struct lttng_uri *uris = NULL;
1520
1521 if (name == NULL || datetime == NULL) {
1522 return -LTTNG_ERR_INVALID;
1523 }
1524
1525 memset(&lsm, 0, sizeof(lsm));
1526
1527 lsm.cmd_type = LTTNG_CREATE_SESSION;
1528 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1529
1530 /* There should never be a data URL */
1531 size = uri_parse_str_urls(url, NULL, &uris);
1532 if (size < 0) {
1533 ret = -LTTNG_ERR_INVALID;
1534 goto error;
1535 }
1536
1537 lsm.u.uri.size = size;
1538
1539 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
1540 /* Don't append datetime if the name was automatically created. */
1541 if (strncmp(name, DEFAULT_SESSION_NAME "-",
1542 strlen(DEFAULT_SESSION_NAME) + 1)) {
1543 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
1544 name, datetime);
1545 } else {
1546 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
1547 }
1548 if (ret < 0) {
1549 PERROR("snprintf uri subdir");
1550 ret = -LTTNG_ERR_FATAL;
1551 goto error;
1552 }
1553 }
1554
1555 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1556 sizeof(struct lttng_uri) * size, NULL);
1557
1558 error:
1559 free(uris);
1560 return ret;
1561 }
1562
1563 /*
1564 * For a given session name, this call checks if the data is ready to be read
1565 * or is still being extracted by the consumer(s) hence not ready to be used by
1566 * any readers.
1567 */
1568 int lttng_data_pending(const char *session_name)
1569 {
1570 int ret;
1571 struct lttcomm_session_msg lsm;
1572
1573 if (session_name == NULL) {
1574 return -LTTNG_ERR_INVALID;
1575 }
1576
1577 memset(&lsm, 0, sizeof(lsm));
1578 lsm.cmd_type = LTTNG_DATA_PENDING;
1579
1580 lttng_ctl_copy_string(lsm.session.name, session_name,
1581 sizeof(lsm.session.name));
1582
1583 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1584
1585 /*
1586 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1587 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1588 * that the data is available. Yes it is hackish but for now this is the
1589 * only way.
1590 */
1591 if (ret == -1) {
1592 ret = 1;
1593 }
1594
1595 return ret;
1596 }
1597
1598 /*
1599 * Create a session exclusively used for snapshot.
1600 *
1601 * Returns LTTNG_OK on success or a negative error code.
1602 */
1603 int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
1604 {
1605 int ret;
1606 ssize_t size;
1607 struct lttcomm_session_msg lsm;
1608 struct lttng_uri *uris = NULL;
1609
1610 if (name == NULL) {
1611 return -LTTNG_ERR_INVALID;
1612 }
1613
1614 memset(&lsm, 0, sizeof(lsm));
1615
1616 lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
1617 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1618
1619 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
1620 if (size < 0) {
1621 return -LTTNG_ERR_INVALID;
1622 }
1623
1624 lsm.u.uri.size = size;
1625
1626 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1627 sizeof(struct lttng_uri) * size, NULL);
1628
1629 free(uris);
1630 return ret;
1631 }
1632
1633 /*
1634 * Create a session exclusively used for live.
1635 *
1636 * Returns LTTNG_OK on success or a negative error code.
1637 */
1638 int lttng_create_session_live(const char *name, const char *url,
1639 unsigned int timer_interval)
1640 {
1641 int ret;
1642 ssize_t size;
1643 struct lttcomm_session_msg lsm;
1644 struct lttng_uri *uris = NULL;
1645
1646 if (name == NULL) {
1647 return -LTTNG_ERR_INVALID;
1648 }
1649
1650 memset(&lsm, 0, sizeof(lsm));
1651
1652 lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE;
1653 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1654
1655 if (url) {
1656 size = uri_parse_str_urls(url, NULL, &uris);
1657 if (size <= 0) {
1658 ret = -LTTNG_ERR_INVALID;
1659 goto end;
1660 }
1661
1662 /* file:// is not accepted for live session. */
1663 if (uris[0].dtype == LTTNG_DST_PATH) {
1664 ret = -LTTNG_ERR_INVALID;
1665 goto end;
1666 }
1667 } else {
1668 size = 0;
1669 }
1670
1671 lsm.u.session_live.nb_uri = size;
1672 lsm.u.session_live.timer_interval = timer_interval;
1673
1674 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1675 sizeof(struct lttng_uri) * size, NULL);
1676
1677 end:
1678 free(uris);
1679 return ret;
1680 }
1681
1682 /*
1683 * lib constructor
1684 */
1685 static void __attribute__((constructor)) init()
1686 {
1687 /* Set default session group */
1688 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
1689 }
1690
1691 /*
1692 * lib destructor
1693 */
1694 static void __attribute__((destructor)) lttng_ctl_exit()
1695 {
1696 free(tracing_group);
1697 }
This page took 0.067569 seconds and 5 git commands to generate.