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