e6dbb678f265e58ae815234e965cfe7c486e69b4
[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
38 #include "filter/filter-ast.h"
39 #include "filter/filter-parser.h"
40 #include "filter/filter-bytecode.h"
41 #include "filter/memstream.h"
42 #include "lttng-ctl-helper.h"
43
44 #ifdef DEBUG
45 static const int print_xml = 1;
46 #define dbg_printf(fmt, args...) \
47 printf("[debug liblttng-ctl] " fmt, ## args)
48 #else
49 static const int print_xml = 0;
50 #define dbg_printf(fmt, args...) \
51 do { \
52 /* do nothing but check printf format */ \
53 if (0) \
54 printf("[debug liblttnctl] " fmt, ## args); \
55 } while (0)
56 #endif
57
58
59 /* Socket to session daemon for communication */
60 static int sessiond_socket;
61 static char sessiond_sock_path[PATH_MAX];
62 static char health_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 memcpy(dst, src, sizeof(struct lttng_domain));
107 break;
108 default:
109 memset(dst, 0, sizeof(struct lttng_domain));
110 break;
111 }
112 }
113 }
114
115 /*
116 * Send lttcomm_session_msg to the session daemon.
117 *
118 * On success, returns the number of bytes sent (>=0)
119 * On error, returns -1
120 */
121 static int send_session_msg(struct lttcomm_session_msg *lsm)
122 {
123 int ret;
124
125 if (!connected) {
126 ret = -LTTNG_ERR_NO_SESSIOND;
127 goto end;
128 }
129
130 DBG("LSM cmd type : %d", lsm->cmd_type);
131
132 ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
133 sizeof(struct lttcomm_session_msg));
134 if (ret < 0) {
135 ret = -LTTNG_ERR_FATAL;
136 }
137
138 end:
139 return ret;
140 }
141
142 /*
143 * Send var len data to the session daemon.
144 *
145 * On success, returns the number of bytes sent (>=0)
146 * On error, returns -1
147 */
148 static int send_session_varlen(void *data, size_t len)
149 {
150 int ret;
151
152 if (!connected) {
153 ret = -LTTNG_ERR_NO_SESSIOND;
154 goto end;
155 }
156
157 if (!data || !len) {
158 ret = 0;
159 goto end;
160 }
161
162 ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
163 if (ret < 0) {
164 ret = -LTTNG_ERR_FATAL;
165 }
166
167 end:
168 return ret;
169 }
170
171 /*
172 * Receive data from the sessiond socket.
173 *
174 * On success, returns the number of bytes received (>=0)
175 * On error, returns -1 (recvmsg() error) or -ENOTCONN
176 */
177 static int recv_data_sessiond(void *buf, size_t len)
178 {
179 int ret;
180
181 if (!connected) {
182 ret = -LTTNG_ERR_NO_SESSIOND;
183 goto end;
184 }
185
186 ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
187 if (ret < 0) {
188 ret = -LTTNG_ERR_FATAL;
189 }
190
191 end:
192 return ret;
193 }
194
195 /*
196 * Check if we are in the specified group.
197 *
198 * If yes return 1, else return -1.
199 */
200 static int check_tracing_group(const char *grp_name)
201 {
202 struct group *grp_tracing; /* no free(). See getgrnam(3) */
203 gid_t *grp_list;
204 int grp_list_size, grp_id, i;
205 int ret = -1;
206
207 /* Get GID of group 'tracing' */
208 grp_tracing = getgrnam(grp_name);
209 if (!grp_tracing) {
210 /* If grp_tracing is NULL, the group does not exist. */
211 goto end;
212 }
213
214 /* Get number of supplementary group IDs */
215 grp_list_size = getgroups(0, NULL);
216 if (grp_list_size < 0) {
217 perror("getgroups");
218 goto end;
219 }
220
221 /* Alloc group list of the right size */
222 grp_list = malloc(grp_list_size * sizeof(gid_t));
223 if (!grp_list) {
224 perror("malloc");
225 goto end;
226 }
227 grp_id = getgroups(grp_list_size, grp_list);
228 if (grp_id < 0) {
229 perror("getgroups");
230 goto free_list;
231 }
232
233 for (i = 0; i < grp_list_size; i++) {
234 if (grp_list[i] == grp_tracing->gr_gid) {
235 ret = 1;
236 break;
237 }
238 }
239
240 free_list:
241 free(grp_list);
242
243 end:
244 return ret;
245 }
246
247 /*
248 * Try connect to session daemon with sock_path.
249 *
250 * Return 0 on success, else -1
251 */
252 static int try_connect_sessiond(const char *sock_path)
253 {
254 int ret;
255
256 /* If socket exist, we check if the daemon listens for connect. */
257 ret = access(sock_path, F_OK);
258 if (ret < 0) {
259 /* Not alive */
260 goto error;
261 }
262
263 ret = lttcomm_connect_unix_sock(sock_path);
264 if (ret < 0) {
265 /* Not alive */
266 goto error;
267 }
268
269 ret = lttcomm_close_unix_sock(ret);
270 if (ret < 0) {
271 perror("lttcomm_close_unix_sock");
272 }
273
274 return 0;
275
276 error:
277 return -1;
278 }
279
280 /*
281 * Set sessiond socket path by putting it in the global sessiond_sock_path
282 * variable.
283 *
284 * Returns 0 on success, negative value on failure (the sessiond socket path
285 * is somehow too long or ENOMEM).
286 */
287 static int set_session_daemon_path(void)
288 {
289 int in_tgroup = 0; /* In tracing group */
290 uid_t uid;
291
292 uid = getuid();
293
294 if (uid != 0) {
295 /* Are we in the tracing group ? */
296 in_tgroup = check_tracing_group(tracing_group);
297 }
298
299 if ((uid == 0) || in_tgroup) {
300 lttng_ctl_copy_string(sessiond_sock_path,
301 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path));
302 }
303
304 if (uid != 0) {
305 int ret;
306
307 if (in_tgroup) {
308 /* Tracing group */
309 ret = try_connect_sessiond(sessiond_sock_path);
310 if (ret >= 0) {
311 goto end;
312 }
313 /* Global session daemon not available... */
314 }
315 /* ...or not in tracing group (and not root), default */
316
317 /*
318 * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
319 * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
320 */
321 ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
322 DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
323 if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
324 goto error;
325 }
326 }
327 end:
328 return 0;
329
330 error:
331 return -1;
332 }
333
334 /*
335 * Connect to the LTTng session daemon.
336 *
337 * On success, return 0. On error, return -1.
338 */
339 static int connect_sessiond(void)
340 {
341 int ret;
342
343 /* Don't try to connect if already connected. */
344 if (connected) {
345 return 0;
346 }
347
348 ret = set_session_daemon_path();
349 if (ret < 0) {
350 goto error;
351 }
352
353 /* Connect to the sesssion daemon */
354 ret = lttcomm_connect_unix_sock(sessiond_sock_path);
355 if (ret < 0) {
356 goto error;
357 }
358
359 sessiond_socket = ret;
360 connected = 1;
361
362 return 0;
363
364 error:
365 return -1;
366 }
367
368 /*
369 * Clean disconnect from the session daemon.
370 * On success, return 0. On error, return -1.
371 */
372 static int disconnect_sessiond(void)
373 {
374 int ret = 0;
375
376 if (connected) {
377 ret = lttcomm_close_unix_sock(sessiond_socket);
378 sessiond_socket = 0;
379 connected = 0;
380 }
381
382 return ret;
383 }
384
385 /*
386 * Ask the session daemon a specific command and put the data into buf.
387 * Takes extra var. len. data as input to send to the session daemon.
388 *
389 * Return size of data (only payload, not header) or a negative error code.
390 */
391 LTTNG_HIDDEN
392 int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
393 void *vardata, size_t varlen, void **buf)
394 {
395 int ret;
396 size_t size;
397 void *data = NULL;
398 struct lttcomm_lttng_msg llm;
399
400 ret = connect_sessiond();
401 if (ret < 0) {
402 ret = -LTTNG_ERR_NO_SESSIOND;
403 goto end;
404 }
405
406 /* Send command to session daemon */
407 ret = send_session_msg(lsm);
408 if (ret < 0) {
409 /* Ret value is a valid lttng error code. */
410 goto end;
411 }
412 /* Send var len data */
413 ret = send_session_varlen(vardata, varlen);
414 if (ret < 0) {
415 /* Ret value is a valid lttng error code. */
416 goto end;
417 }
418
419 /* Get header from data transmission */
420 ret = recv_data_sessiond(&llm, sizeof(llm));
421 if (ret < 0) {
422 /* Ret value is a valid lttng error code. */
423 goto end;
424 }
425
426 /* Check error code if OK */
427 if (llm.ret_code != LTTNG_OK) {
428 ret = -llm.ret_code;
429 goto end;
430 }
431
432 size = llm.data_size;
433 if (size == 0) {
434 /* If client free with size 0 */
435 if (buf != NULL) {
436 *buf = NULL;
437 }
438 ret = 0;
439 goto end;
440 }
441
442 data = (void*) malloc(size);
443
444 /* Get payload data */
445 ret = recv_data_sessiond(data, size);
446 if (ret < 0) {
447 free(data);
448 goto end;
449 }
450
451 /*
452 * Extra protection not to dereference a NULL pointer. If buf is NULL at
453 * this point, an error is returned and data is freed.
454 */
455 if (buf == NULL) {
456 ret = -LTTNG_ERR_INVALID;
457 free(data);
458 goto end;
459 }
460
461 *buf = data;
462 ret = size;
463
464 end:
465 disconnect_sessiond();
466 return ret;
467 }
468
469 /*
470 * Create lttng handle and return pointer.
471 * The returned pointer will be NULL in case of malloc() error.
472 */
473 struct lttng_handle *lttng_create_handle(const char *session_name,
474 struct lttng_domain *domain)
475 {
476 struct lttng_handle *handle = NULL;
477
478 if (domain == NULL) {
479 goto end;
480 }
481
482 handle = malloc(sizeof(struct lttng_handle));
483 if (handle == NULL) {
484 PERROR("malloc handle");
485 goto end;
486 }
487
488 /* Copy session name */
489 lttng_ctl_copy_string(handle->session_name, session_name,
490 sizeof(handle->session_name));
491
492 /* Copy lttng domain */
493 lttng_ctl_copy_lttng_domain(&handle->domain, domain);
494
495 end:
496 return handle;
497 }
498
499 /*
500 * Destroy handle by free(3) the pointer.
501 */
502 void lttng_destroy_handle(struct lttng_handle *handle)
503 {
504 free(handle);
505 }
506
507 /*
508 * Register an outside consumer.
509 * Returns size of returned session payload data or a negative error code.
510 */
511 int lttng_register_consumer(struct lttng_handle *handle,
512 const char *socket_path)
513 {
514 struct lttcomm_session_msg lsm;
515
516 if (handle == NULL || socket_path == NULL) {
517 return -LTTNG_ERR_INVALID;
518 }
519
520 lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
521 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
522 sizeof(lsm.session.name));
523 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
524
525 lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
526
527 return lttng_ctl_ask_sessiond(&lsm, NULL);
528 }
529
530 /*
531 * Start tracing for all traces of the session.
532 * Returns size of returned session payload data or a negative error code.
533 */
534 int lttng_start_tracing(const char *session_name)
535 {
536 struct lttcomm_session_msg lsm;
537
538 if (session_name == NULL) {
539 return -LTTNG_ERR_INVALID;
540 }
541
542 lsm.cmd_type = LTTNG_START_TRACE;
543
544 lttng_ctl_copy_string(lsm.session.name, session_name,
545 sizeof(lsm.session.name));
546
547 return lttng_ctl_ask_sessiond(&lsm, NULL);
548 }
549
550 /*
551 * Stop tracing for all traces of the session.
552 */
553 static int _lttng_stop_tracing(const char *session_name, int wait)
554 {
555 int ret, data_ret;
556 struct lttcomm_session_msg lsm;
557
558 if (session_name == NULL) {
559 return -LTTNG_ERR_INVALID;
560 }
561
562 lsm.cmd_type = LTTNG_STOP_TRACE;
563
564 lttng_ctl_copy_string(lsm.session.name, session_name,
565 sizeof(lsm.session.name));
566
567 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
568 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
569 goto error;
570 }
571
572 if (!wait) {
573 goto end;
574 }
575
576 _MSG("Waiting for data availability");
577 fflush(stdout);
578
579 /* Check for data availability */
580 do {
581 data_ret = lttng_data_pending(session_name);
582 if (data_ret < 0) {
583 /* Return the data available call error. */
584 ret = data_ret;
585 goto error;
586 }
587
588 /*
589 * Data sleep time before retrying (in usec). Don't sleep if the call
590 * returned value indicates availability.
591 */
592 if (data_ret) {
593 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
594 _MSG(".");
595 fflush(stdout);
596 }
597 } while (data_ret != 0);
598
599 MSG("");
600
601 end:
602 error:
603 return ret;
604 }
605
606 /*
607 * Stop tracing and wait for data availability.
608 */
609 int lttng_stop_tracing(const char *session_name)
610 {
611 return _lttng_stop_tracing(session_name, 1);
612 }
613
614 /*
615 * Stop tracing but _don't_ wait for data availability.
616 */
617 int lttng_stop_tracing_no_wait(const char *session_name)
618 {
619 return _lttng_stop_tracing(session_name, 0);
620 }
621
622 /*
623 * Add context to a channel.
624 *
625 * If the given channel is NULL, add the contexts to all channels.
626 * The event_name param is ignored.
627 *
628 * Returns the size of the returned payload data or a negative error code.
629 */
630 int lttng_add_context(struct lttng_handle *handle,
631 struct lttng_event_context *ctx, const char *event_name,
632 const char *channel_name)
633 {
634 struct lttcomm_session_msg lsm;
635
636 /* Safety check. Both are mandatory */
637 if (handle == NULL || ctx == NULL) {
638 return -LTTNG_ERR_INVALID;
639 }
640
641 memset(&lsm, 0, sizeof(lsm));
642
643 lsm.cmd_type = LTTNG_ADD_CONTEXT;
644
645 /* If no channel name, send empty string. */
646 if (channel_name == NULL) {
647 lttng_ctl_copy_string(lsm.u.context.channel_name, "",
648 sizeof(lsm.u.context.channel_name));
649 } else {
650 lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name,
651 sizeof(lsm.u.context.channel_name));
652 }
653
654 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
655
656 memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
657
658 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
659 sizeof(lsm.session.name));
660
661 return lttng_ctl_ask_sessiond(&lsm, NULL);
662 }
663
664 /*
665 * Enable event(s) for a channel.
666 * If no event name is specified, all events are enabled.
667 * If no channel name is specified, the default 'channel0' is used.
668 * Returns size of returned session payload data or a negative error code.
669 */
670 int lttng_enable_event(struct lttng_handle *handle,
671 struct lttng_event *ev, const char *channel_name)
672 {
673 struct lttcomm_session_msg lsm;
674
675 if (handle == NULL || ev == NULL) {
676 return -LTTNG_ERR_INVALID;
677 }
678
679 memset(&lsm, 0, sizeof(lsm));
680
681 /* If no channel name, send empty string. */
682 if (channel_name == NULL) {
683 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
684 sizeof(lsm.u.enable.channel_name));
685 } else {
686 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
687 sizeof(lsm.u.enable.channel_name));
688 }
689
690 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
691
692 if (ev->name[0] != '\0') {
693 lsm.cmd_type = LTTNG_ENABLE_EVENT;
694 } else {
695 lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
696 }
697 memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
698
699 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
700 sizeof(lsm.session.name));
701
702 return lttng_ctl_ask_sessiond(&lsm, NULL);
703 }
704
705 /*
706 * Create or enable an event with a filter expression.
707 *
708 * Return negative error value on error.
709 * Return size of returned session payload data if OK.
710 */
711 int lttng_enable_event_with_filter(struct lttng_handle *handle,
712 struct lttng_event *event, const char *channel_name,
713 const char *filter_expression)
714 {
715 struct lttcomm_session_msg lsm;
716 struct filter_parser_ctx *ctx;
717 FILE *fmem;
718 int ret = 0;
719
720 if (!filter_expression) {
721 /*
722 * Fall back to normal event enabling if no filter
723 * specified.
724 */
725 return lttng_enable_event(handle, event, channel_name);
726 }
727
728 /*
729 * Empty filter string will always be rejected by the parser
730 * anyway, so treat this corner-case early to eliminate
731 * lttng_fmemopen error for 0-byte allocation.
732 */
733 if (handle == NULL || filter_expression[0] == '\0') {
734 return -LTTNG_ERR_INVALID;
735 }
736
737 /*
738 * casting const to non-const, as the underlying function will
739 * use it in read-only mode.
740 */
741 fmem = lttng_fmemopen((void *) filter_expression,
742 strlen(filter_expression), "r");
743 if (!fmem) {
744 fprintf(stderr, "Error opening memory as stream\n");
745 return -LTTNG_ERR_FILTER_NOMEM;
746 }
747 ctx = filter_parser_ctx_alloc(fmem);
748 if (!ctx) {
749 fprintf(stderr, "Error allocating parser\n");
750 ret = -LTTNG_ERR_FILTER_NOMEM;
751 goto alloc_error;
752 }
753 ret = filter_parser_ctx_append_ast(ctx);
754 if (ret) {
755 fprintf(stderr, "Parse error\n");
756 ret = -LTTNG_ERR_FILTER_INVAL;
757 goto parse_error;
758 }
759 ret = filter_visitor_set_parent(ctx);
760 if (ret) {
761 fprintf(stderr, "Set parent error\n");
762 ret = -LTTNG_ERR_FILTER_INVAL;
763 goto parse_error;
764 }
765 if (print_xml) {
766 ret = filter_visitor_print_xml(ctx, stdout, 0);
767 if (ret) {
768 fflush(stdout);
769 fprintf(stderr, "XML print error\n");
770 ret = -LTTNG_ERR_FILTER_INVAL;
771 goto parse_error;
772 }
773 }
774
775 dbg_printf("Generating IR... ");
776 fflush(stdout);
777 ret = filter_visitor_ir_generate(ctx);
778 if (ret) {
779 fprintf(stderr, "Generate IR error\n");
780 ret = -LTTNG_ERR_FILTER_INVAL;
781 goto parse_error;
782 }
783 dbg_printf("done\n");
784
785 dbg_printf("Validating IR... ");
786 fflush(stdout);
787 ret = filter_visitor_ir_check_binary_op_nesting(ctx);
788 if (ret) {
789 ret = -LTTNG_ERR_FILTER_INVAL;
790 goto parse_error;
791 }
792 dbg_printf("done\n");
793
794 dbg_printf("Generating bytecode... ");
795 fflush(stdout);
796 ret = filter_visitor_bytecode_generate(ctx);
797 if (ret) {
798 fprintf(stderr, "Generate bytecode error\n");
799 ret = -LTTNG_ERR_FILTER_INVAL;
800 goto parse_error;
801 }
802 dbg_printf("done\n");
803 dbg_printf("Size of bytecode generated: %u bytes.\n",
804 bytecode_get_len(&ctx->bytecode->b));
805
806 memset(&lsm, 0, sizeof(lsm));
807
808 lsm.cmd_type = LTTNG_ENABLE_EVENT_WITH_FILTER;
809
810 /* If no channel name, send empty string. */
811 if (channel_name == NULL) {
812 lttng_ctl_copy_string(lsm.u.enable.channel_name, "",
813 sizeof(lsm.u.enable.channel_name));
814 } else {
815 lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name,
816 sizeof(lsm.u.enable.channel_name));
817 }
818
819 /* Copy event name */
820 if (event) {
821 memcpy(&lsm.u.enable.event, event, sizeof(lsm.u.enable.event));
822 }
823
824 lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
825 + bytecode_get_len(&ctx->bytecode->b);
826
827 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
828
829 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
830 sizeof(lsm.session.name));
831
832 ret = lttng_ctl_ask_sessiond_varlen(&lsm, &ctx->bytecode->b,
833 lsm.u.enable.bytecode_len, NULL);
834
835 filter_bytecode_free(ctx);
836 filter_ir_free(ctx);
837 filter_parser_ctx_free(ctx);
838 if (fclose(fmem) != 0) {
839 perror("fclose");
840 }
841 return ret;
842
843 parse_error:
844 filter_bytecode_free(ctx);
845 filter_ir_free(ctx);
846 filter_parser_ctx_free(ctx);
847 alloc_error:
848 if (fclose(fmem) != 0) {
849 perror("fclose");
850 }
851 return ret;
852 }
853
854 /*
855 * Disable event(s) of a channel and domain.
856 * If no event name is specified, all events are disabled.
857 * If no channel name is specified, the default 'channel0' is used.
858 * Returns size of returned session payload data or a negative error code.
859 */
860 int lttng_disable_event(struct lttng_handle *handle, const char *name,
861 const char *channel_name)
862 {
863 struct lttcomm_session_msg lsm;
864
865 if (handle == NULL) {
866 return -LTTNG_ERR_INVALID;
867 }
868
869 memset(&lsm, 0, sizeof(lsm));
870
871 /* If no channel name, send empty string. */
872 if (channel_name == NULL) {
873 lttng_ctl_copy_string(lsm.u.disable.channel_name, "",
874 sizeof(lsm.u.disable.channel_name));
875 } else {
876 lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name,
877 sizeof(lsm.u.disable.channel_name));
878 }
879
880 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
881
882 if (name != NULL) {
883 lttng_ctl_copy_string(lsm.u.disable.name, name,
884 sizeof(lsm.u.disable.name));
885 lsm.cmd_type = LTTNG_DISABLE_EVENT;
886 } else {
887 lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
888 }
889
890 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
891 sizeof(lsm.session.name));
892
893 return lttng_ctl_ask_sessiond(&lsm, NULL);
894 }
895
896 /*
897 * Enable channel per domain
898 * Returns size of returned session payload data or a negative error code.
899 */
900 int lttng_enable_channel(struct lttng_handle *handle,
901 struct lttng_channel *chan)
902 {
903 struct lttcomm_session_msg lsm;
904
905 /*
906 * NULL arguments are forbidden. No default values.
907 */
908 if (handle == NULL || chan == NULL) {
909 return -LTTNG_ERR_INVALID;
910 }
911
912 memset(&lsm, 0, sizeof(lsm));
913
914 memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
915
916 lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
917
918 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
919
920 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
921 sizeof(lsm.session.name));
922
923 return lttng_ctl_ask_sessiond(&lsm, NULL);
924 }
925
926 /*
927 * All tracing will be stopped for registered events of the channel.
928 * Returns size of returned session payload data or a negative error code.
929 */
930 int lttng_disable_channel(struct lttng_handle *handle, const char *name)
931 {
932 struct lttcomm_session_msg lsm;
933
934 /* Safety check. Both are mandatory */
935 if (handle == NULL || name == NULL) {
936 return -LTTNG_ERR_INVALID;
937 }
938
939 memset(&lsm, 0, sizeof(lsm));
940
941 lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
942
943 lttng_ctl_copy_string(lsm.u.disable.channel_name, name,
944 sizeof(lsm.u.disable.channel_name));
945
946 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
947
948 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
949 sizeof(lsm.session.name));
950
951 return lttng_ctl_ask_sessiond(&lsm, NULL);
952 }
953
954 /*
955 * Lists all available tracepoints of domain.
956 * Sets the contents of the events array.
957 * Returns the number of lttng_event entries in events;
958 * on error, returns a negative value.
959 */
960 int lttng_list_tracepoints(struct lttng_handle *handle,
961 struct lttng_event **events)
962 {
963 int ret;
964 struct lttcomm_session_msg lsm;
965
966 if (handle == NULL) {
967 return -LTTNG_ERR_INVALID;
968 }
969
970 lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
971 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
972
973 ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
974 if (ret < 0) {
975 return ret;
976 }
977
978 return ret / sizeof(struct lttng_event);
979 }
980
981 /*
982 * Lists all available tracepoint fields of domain.
983 * Sets the contents of the event field array.
984 * Returns the number of lttng_event_field entries in events;
985 * on error, returns a negative value.
986 */
987 int lttng_list_tracepoint_fields(struct lttng_handle *handle,
988 struct lttng_event_field **fields)
989 {
990 int ret;
991 struct lttcomm_session_msg lsm;
992
993 if (handle == NULL) {
994 return -LTTNG_ERR_INVALID;
995 }
996
997 lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
998 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
999
1000 ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
1001 if (ret < 0) {
1002 return ret;
1003 }
1004
1005 return ret / sizeof(struct lttng_event_field);
1006 }
1007
1008 /*
1009 * Returns a human readable string describing
1010 * the error code (a negative value).
1011 */
1012 const char *lttng_strerror(int code)
1013 {
1014 return error_get_str(code);
1015 }
1016
1017 /*
1018 * Create a brand new session using name and url for destination.
1019 *
1020 * Returns LTTNG_OK on success or a negative error code.
1021 */
1022 int lttng_create_session(const char *name, const char *url)
1023 {
1024 int ret;
1025 ssize_t size;
1026 struct lttcomm_session_msg lsm;
1027 struct lttng_uri *uris = NULL;
1028
1029 if (name == NULL) {
1030 return -LTTNG_ERR_INVALID;
1031 }
1032
1033 memset(&lsm, 0, sizeof(lsm));
1034
1035 lsm.cmd_type = LTTNG_CREATE_SESSION;
1036 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1037
1038 /* There should never be a data URL */
1039 size = uri_parse_str_urls(url, NULL, &uris);
1040 if (size < 0) {
1041 return -LTTNG_ERR_INVALID;
1042 }
1043
1044 lsm.u.uri.size = size;
1045
1046 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1047 sizeof(struct lttng_uri) * size, NULL);
1048
1049 free(uris);
1050 return ret;
1051 }
1052
1053 /*
1054 * Destroy session using name.
1055 * Returns size of returned session payload data or a negative error code.
1056 */
1057 int lttng_destroy_session(const char *session_name)
1058 {
1059 struct lttcomm_session_msg lsm;
1060
1061 if (session_name == NULL) {
1062 return -LTTNG_ERR_INVALID;
1063 }
1064
1065 lsm.cmd_type = LTTNG_DESTROY_SESSION;
1066
1067 lttng_ctl_copy_string(lsm.session.name, session_name,
1068 sizeof(lsm.session.name));
1069
1070 return lttng_ctl_ask_sessiond(&lsm, NULL);
1071 }
1072
1073 /*
1074 * Ask the session daemon for all available sessions.
1075 * Sets the contents of the sessions array.
1076 * Returns the number of lttng_session entries in sessions;
1077 * on error, returns a negative value.
1078 */
1079 int lttng_list_sessions(struct lttng_session **sessions)
1080 {
1081 int ret;
1082 struct lttcomm_session_msg lsm;
1083
1084 lsm.cmd_type = LTTNG_LIST_SESSIONS;
1085 ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
1086 if (ret < 0) {
1087 return ret;
1088 }
1089
1090 return ret / sizeof(struct lttng_session);
1091 }
1092
1093 /*
1094 * Ask the session daemon for all available domains of a session.
1095 * Sets the contents of the domains array.
1096 * Returns the number of lttng_domain entries in domains;
1097 * on error, returns a negative value.
1098 */
1099 int lttng_list_domains(const char *session_name,
1100 struct lttng_domain **domains)
1101 {
1102 int ret;
1103 struct lttcomm_session_msg lsm;
1104
1105 if (session_name == NULL) {
1106 return -LTTNG_ERR_INVALID;
1107 }
1108
1109 lsm.cmd_type = LTTNG_LIST_DOMAINS;
1110
1111 lttng_ctl_copy_string(lsm.session.name, session_name,
1112 sizeof(lsm.session.name));
1113
1114 ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
1115 if (ret < 0) {
1116 return ret;
1117 }
1118
1119 return ret / sizeof(struct lttng_domain);
1120 }
1121
1122 /*
1123 * Ask the session daemon for all available channels of a session.
1124 * Sets the contents of the channels array.
1125 * Returns the number of lttng_channel entries in channels;
1126 * on error, returns a negative value.
1127 */
1128 int lttng_list_channels(struct lttng_handle *handle,
1129 struct lttng_channel **channels)
1130 {
1131 int ret;
1132 struct lttcomm_session_msg lsm;
1133
1134 if (handle == NULL) {
1135 return -LTTNG_ERR_INVALID;
1136 }
1137
1138 lsm.cmd_type = LTTNG_LIST_CHANNELS;
1139 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1140 sizeof(lsm.session.name));
1141
1142 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1143
1144 ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
1145 if (ret < 0) {
1146 return ret;
1147 }
1148
1149 return ret / sizeof(struct lttng_channel);
1150 }
1151
1152 /*
1153 * Ask the session daemon for all available events of a session channel.
1154 * Sets the contents of the events array.
1155 * Returns the number of lttng_event entries in events;
1156 * on error, returns a negative value.
1157 */
1158 int lttng_list_events(struct lttng_handle *handle,
1159 const char *channel_name, struct lttng_event **events)
1160 {
1161 int ret;
1162 struct lttcomm_session_msg lsm;
1163
1164 /* Safety check. An handle and channel name are mandatory */
1165 if (handle == NULL || channel_name == NULL) {
1166 return -LTTNG_ERR_INVALID;
1167 }
1168
1169 lsm.cmd_type = LTTNG_LIST_EVENTS;
1170 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1171 sizeof(lsm.session.name));
1172 lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
1173 sizeof(lsm.u.list.channel_name));
1174
1175 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1176
1177 ret = lttng_ctl_ask_sessiond(&lsm, (void**) events);
1178 if (ret < 0) {
1179 return ret;
1180 }
1181
1182 return ret / sizeof(struct lttng_event);
1183 }
1184
1185 /*
1186 * Sets the tracing_group variable with name.
1187 * This function allocates memory pointed to by tracing_group.
1188 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
1189 */
1190 int lttng_set_tracing_group(const char *name)
1191 {
1192 if (name == NULL) {
1193 return -LTTNG_ERR_INVALID;
1194 }
1195
1196 if (asprintf(&tracing_group, "%s", name) < 0) {
1197 return -LTTNG_ERR_FATAL;
1198 }
1199
1200 return 0;
1201 }
1202
1203 /*
1204 * Returns size of returned session payload data or a negative error code.
1205 */
1206 int lttng_calibrate(struct lttng_handle *handle,
1207 struct lttng_calibrate *calibrate)
1208 {
1209 struct lttcomm_session_msg lsm;
1210
1211 /* Safety check. NULL pointer are forbidden */
1212 if (handle == NULL || calibrate == NULL) {
1213 return -LTTNG_ERR_INVALID;
1214 }
1215
1216 lsm.cmd_type = LTTNG_CALIBRATE;
1217 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1218
1219 memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
1220
1221 return lttng_ctl_ask_sessiond(&lsm, NULL);
1222 }
1223
1224 /*
1225 * Set default channel attributes.
1226 * If either or both of the arguments are null, attr content is zeroe'd.
1227 */
1228 void lttng_channel_set_default_attr(struct lttng_domain *domain,
1229 struct lttng_channel_attr *attr)
1230 {
1231 /* Safety check */
1232 if (attr == NULL || domain == NULL) {
1233 return;
1234 }
1235
1236 memset(attr, 0, sizeof(struct lttng_channel_attr));
1237
1238 /* Same for all domains. */
1239 attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
1240 attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
1241 attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
1242
1243 switch (domain->type) {
1244 case LTTNG_DOMAIN_KERNEL:
1245 attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
1246 attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
1247 attr->subbuf_size = default_get_kernel_channel_subbuf_size();
1248 attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
1249 attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1250 break;
1251 case LTTNG_DOMAIN_UST:
1252 switch (domain->buf_type) {
1253 case LTTNG_BUFFER_PER_UID:
1254 attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
1255 attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
1256 attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
1257 attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
1258 attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER;
1259 break;
1260 case LTTNG_BUFFER_PER_PID:
1261 default:
1262 attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
1263 attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
1264 attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
1265 attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
1266 attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER;
1267 break;
1268 }
1269 default:
1270 /* Default behavior: leave set to 0. */
1271 break;
1272 }
1273 }
1274
1275 /*
1276 * Check if session daemon is alive.
1277 *
1278 * Return 1 if alive or 0 if not.
1279 * On error returns a negative value.
1280 */
1281 int lttng_session_daemon_alive(void)
1282 {
1283 int ret;
1284
1285 ret = set_session_daemon_path();
1286 if (ret < 0) {
1287 /* Error */
1288 return ret;
1289 }
1290
1291 if (*sessiond_sock_path == '\0') {
1292 /*
1293 * No socket path set. Weird error which means the constructor was not
1294 * called.
1295 */
1296 assert(0);
1297 }
1298
1299 ret = try_connect_sessiond(sessiond_sock_path);
1300 if (ret < 0) {
1301 /* Not alive */
1302 return 0;
1303 }
1304
1305 /* Is alive */
1306 return 1;
1307 }
1308
1309 /*
1310 * Set URL for a consumer for a session and domain.
1311 *
1312 * Return 0 on success, else a negative value.
1313 */
1314 int lttng_set_consumer_url(struct lttng_handle *handle,
1315 const char *control_url, const char *data_url)
1316 {
1317 int ret;
1318 ssize_t size;
1319 struct lttcomm_session_msg lsm;
1320 struct lttng_uri *uris = NULL;
1321
1322 if (handle == NULL || (control_url == NULL && data_url == NULL)) {
1323 return -LTTNG_ERR_INVALID;
1324 }
1325
1326 memset(&lsm, 0, sizeof(lsm));
1327
1328 lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
1329
1330 lttng_ctl_copy_string(lsm.session.name, handle->session_name,
1331 sizeof(lsm.session.name));
1332 lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
1333
1334 size = uri_parse_str_urls(control_url, data_url, &uris);
1335 if (size < 0) {
1336 return -LTTNG_ERR_INVALID;
1337 }
1338
1339 lsm.u.uri.size = size;
1340
1341 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1342 sizeof(struct lttng_uri) * size, NULL);
1343
1344 free(uris);
1345 return ret;
1346 }
1347
1348 /*
1349 * [OBSOLETE]
1350 */
1351 int lttng_enable_consumer(struct lttng_handle *handle)
1352 {
1353 return -ENOSYS;
1354 }
1355
1356 /*
1357 * [OBSOLETE]
1358 */
1359 int lttng_disable_consumer(struct lttng_handle *handle)
1360 {
1361 return -ENOSYS;
1362 }
1363
1364 /*
1365 * Set health socket path by putting it in the global health_sock_path
1366 * variable.
1367 *
1368 * Returns 0 on success or -ENOMEM.
1369 */
1370 static int set_health_socket_path(void)
1371 {
1372 uid_t uid;
1373 const char *home;
1374 int ret;
1375
1376 uid = getuid();
1377
1378 if (uid == 0 || check_tracing_group(tracing_group)) {
1379 lttng_ctl_copy_string(health_sock_path,
1380 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK, sizeof(health_sock_path));
1381 return 0;
1382 }
1383
1384 /*
1385 * With GNU C < 2.1, snprintf returns -1 if the target buffer
1386 * is too small; With GNU C >= 2.1, snprintf returns the
1387 * required size (excluding closing null).
1388 */
1389 home = utils_get_home_dir();
1390 if (home == NULL) {
1391 /* Fallback in /tmp */
1392 home = "/tmp";
1393 }
1394
1395 ret = snprintf(health_sock_path, sizeof(health_sock_path),
1396 DEFAULT_HOME_HEALTH_UNIX_SOCK, home);
1397 if ((ret < 0) || (ret >= sizeof(health_sock_path))) {
1398 return -ENOMEM;
1399 }
1400
1401 return 0;
1402 }
1403
1404 /*
1405 * Check session daemon health for a specific health component.
1406 *
1407 * Return 0 if health is OK or else 1 if BAD.
1408 *
1409 * Any other negative value is a lttng error code which can be translated with
1410 * lttng_strerror().
1411 */
1412 int lttng_health_check(enum lttng_health_component c)
1413 {
1414 int sock, ret;
1415 struct lttcomm_health_msg msg;
1416 struct lttcomm_health_data reply;
1417
1418 /* Connect to the sesssion daemon */
1419 sock = lttcomm_connect_unix_sock(health_sock_path);
1420 if (sock < 0) {
1421 ret = -LTTNG_ERR_NO_SESSIOND;
1422 goto error;
1423 }
1424
1425 msg.cmd = LTTNG_HEALTH_CHECK;
1426 msg.component = c;
1427
1428 ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg));
1429 if (ret < 0) {
1430 ret = -LTTNG_ERR_FATAL;
1431 goto close_error;
1432 }
1433
1434 ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply));
1435 if (ret < 0) {
1436 ret = -LTTNG_ERR_FATAL;
1437 goto close_error;
1438 }
1439
1440 ret = reply.ret_code;
1441
1442 close_error:
1443 {
1444 int closeret;
1445
1446 closeret = close(sock);
1447 assert(!closeret);
1448 }
1449
1450 error:
1451 return ret;
1452 }
1453
1454 /*
1455 * This is an extension of create session that is ONLY and SHOULD only be used
1456 * by the lttng command line program. It exists to avoid using URI parsing in
1457 * the lttng client.
1458 *
1459 * We need the date and time for the trace path subdirectory for the case where
1460 * the user does NOT define one using either -o or -U. Using the normal
1461 * lttng_create_session API call, we have no clue on the session daemon side if
1462 * the URL was generated automatically by the client or define by the user.
1463 *
1464 * So this function "wrapper" is hidden from the public API, takes the datetime
1465 * string and appends it if necessary to the URI subdirectory before sending it
1466 * to the session daemon.
1467 *
1468 * With this extra function, the lttng_create_session call behavior is not
1469 * changed and the timestamp is appended to the URI on the session daemon side
1470 * if necessary.
1471 */
1472 int _lttng_create_session_ext(const char *name, const char *url,
1473 const char *datetime)
1474 {
1475 int ret;
1476 ssize_t size;
1477 struct lttcomm_session_msg lsm;
1478 struct lttng_uri *uris = NULL;
1479
1480 if (name == NULL || datetime == NULL) {
1481 return -LTTNG_ERR_INVALID;
1482 }
1483
1484 memset(&lsm, 0, sizeof(lsm));
1485
1486 lsm.cmd_type = LTTNG_CREATE_SESSION;
1487 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1488
1489 /* There should never be a data URL */
1490 size = uri_parse_str_urls(url, NULL, &uris);
1491 if (size < 0) {
1492 ret = -LTTNG_ERR_INVALID;
1493 goto error;
1494 }
1495
1496 lsm.u.uri.size = size;
1497
1498 if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
1499 /* Don't append datetime if the name was automatically created. */
1500 if (strncmp(name, DEFAULT_SESSION_NAME "-",
1501 strlen(DEFAULT_SESSION_NAME) + 1)) {
1502 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
1503 name, datetime);
1504 } else {
1505 ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
1506 }
1507 if (ret < 0) {
1508 PERROR("snprintf uri subdir");
1509 ret = -LTTNG_ERR_FATAL;
1510 goto error;
1511 }
1512 }
1513
1514 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1515 sizeof(struct lttng_uri) * size, NULL);
1516
1517 error:
1518 free(uris);
1519 return ret;
1520 }
1521
1522 /*
1523 * For a given session name, this call checks if the data is ready to be read
1524 * or is still being extracted by the consumer(s) hence not ready to be used by
1525 * any readers.
1526 */
1527 int lttng_data_pending(const char *session_name)
1528 {
1529 int ret;
1530 struct lttcomm_session_msg lsm;
1531
1532 if (session_name == NULL) {
1533 return -LTTNG_ERR_INVALID;
1534 }
1535
1536 lsm.cmd_type = LTTNG_DATA_PENDING;
1537
1538 lttng_ctl_copy_string(lsm.session.name, session_name,
1539 sizeof(lsm.session.name));
1540
1541 ret = lttng_ctl_ask_sessiond(&lsm, NULL);
1542
1543 /*
1544 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1545 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1546 * that the data is available. Yes it is hackish but for now this is the
1547 * only way.
1548 */
1549 if (ret == -1) {
1550 ret = 1;
1551 }
1552
1553 return ret;
1554 }
1555
1556 /*
1557 * Create a session exclusively used for snapshot.
1558 *
1559 * Returns LTTNG_OK on success or a negative error code.
1560 */
1561 int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
1562 {
1563 int ret;
1564 ssize_t size;
1565 struct lttcomm_session_msg lsm;
1566 struct lttng_uri *uris = NULL;
1567
1568 if (name == NULL) {
1569 return -LTTNG_ERR_INVALID;
1570 }
1571
1572 memset(&lsm, 0, sizeof(lsm));
1573
1574 lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
1575 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1576
1577 size = uri_parse_str_urls(snapshot_url, NULL, &uris);
1578 if (size < 0) {
1579 return -LTTNG_ERR_INVALID;
1580 }
1581
1582 lsm.u.uri.size = size;
1583
1584 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1585 sizeof(struct lttng_uri) * size, NULL);
1586
1587 free(uris);
1588 return ret;
1589 }
1590
1591 /*
1592 * Create a session exclusively used for live.
1593 *
1594 * Returns LTTNG_OK on success or a negative error code.
1595 */
1596 int lttng_create_session_live(const char *name, const char *url,
1597 unsigned int timer_interval)
1598 {
1599 int ret;
1600 ssize_t size;
1601 struct lttcomm_session_msg lsm;
1602 struct lttng_uri *uris = NULL;
1603
1604 if (name == NULL) {
1605 return -LTTNG_ERR_INVALID;
1606 }
1607
1608 memset(&lsm, 0, sizeof(lsm));
1609
1610 lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE;
1611 lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
1612
1613 size = uri_parse_str_urls(url, NULL, &uris);
1614 if (size < 0) {
1615 ret = -LTTNG_ERR_INVALID;
1616 goto end;
1617 }
1618
1619 /* file:// is not accepted for live session. */
1620 if (uris[0].dtype == LTTNG_DST_PATH) {
1621 ret = -LTTNG_ERR_INVALID;
1622 goto end;
1623 }
1624
1625 lsm.u.session_live.nb_uri = size;
1626 lsm.u.session_live.timer_interval = timer_interval;
1627
1628 ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
1629 sizeof(struct lttng_uri) * size, NULL);
1630
1631 end:
1632 free(uris);
1633 return ret;
1634 }
1635
1636 /*
1637 * lib constructor
1638 */
1639 static void __attribute__((constructor)) init()
1640 {
1641 /* Set default session group */
1642 lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
1643 /* Set socket for health check */
1644 if (set_health_socket_path()) {
1645 abort();
1646 }
1647 }
1648
1649 /*
1650 * lib destructor
1651 */
1652 static void __attribute__((destructor)) lttng_ctl_exit()
1653 {
1654 free(tracing_group);
1655 }
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