4 * Linux Trace Toolkit Control Library
6 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
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.
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.
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
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>
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"
46 static const int print_xml
= 1;
47 #define dbg_printf(fmt, args...) \
48 printf("[debug liblttng-ctl] " fmt, ## args)
50 static const int print_xml
= 0;
51 #define dbg_printf(fmt, args...) \
53 /* do nothing but check printf format */ \
55 printf("[debug liblttnctl] " fmt, ## args); \
60 /* Socket to session daemon for communication */
61 static int sessiond_socket
;
62 static char sessiond_sock_path
[PATH_MAX
];
65 static char *tracing_group
;
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.
76 int lttng_opt_verbose
;
80 * Copy string from src to dst and enforce null terminated byte.
83 void lttng_ctl_copy_string(char *dst
, const char *src
, size_t len
)
86 strncpy(dst
, src
, len
);
87 /* Enforce the NULL terminated byte */
95 * Copy domain to lttcomm_session_msg domain.
97 * If domain is unknown, default domain will be the kernel.
100 void lttng_ctl_copy_lttng_domain(struct lttng_domain
*dst
,
101 struct lttng_domain
*src
)
105 case LTTNG_DOMAIN_KERNEL
:
106 case LTTNG_DOMAIN_UST
:
107 case LTTNG_DOMAIN_JUL
:
108 case LTTNG_DOMAIN_LOG4J
:
109 memcpy(dst
, src
, sizeof(struct lttng_domain
));
112 memset(dst
, 0, sizeof(struct lttng_domain
));
119 * Send lttcomm_session_msg to the session daemon.
121 * On success, returns the number of bytes sent (>=0)
122 * On error, returns -1
124 static int send_session_msg(struct lttcomm_session_msg
*lsm
)
129 ret
= -LTTNG_ERR_NO_SESSIOND
;
133 DBG("LSM cmd type : %d", lsm
->cmd_type
);
135 ret
= lttcomm_send_creds_unix_sock(sessiond_socket
, lsm
,
136 sizeof(struct lttcomm_session_msg
));
138 ret
= -LTTNG_ERR_FATAL
;
146 * Send var len data to the session daemon.
148 * On success, returns the number of bytes sent (>=0)
149 * On error, returns -1
151 static int send_session_varlen(void *data
, size_t len
)
156 ret
= -LTTNG_ERR_NO_SESSIOND
;
165 ret
= lttcomm_send_unix_sock(sessiond_socket
, data
, len
);
167 ret
= -LTTNG_ERR_FATAL
;
175 * Receive data from the sessiond socket.
177 * On success, returns the number of bytes received (>=0)
178 * On error, returns -1 (recvmsg() error) or -ENOTCONN
180 static int recv_data_sessiond(void *buf
, size_t len
)
185 ret
= -LTTNG_ERR_NO_SESSIOND
;
189 ret
= lttcomm_recv_unix_sock(sessiond_socket
, buf
, len
);
191 ret
= -LTTNG_ERR_FATAL
;
199 * Check if we are in the specified group.
201 * If yes return 1, else return -1.
204 int lttng_check_tracing_group(void)
206 struct group
*grp_tracing
; /* no free(). See getgrnam(3) */
208 int grp_list_size
, grp_id
, i
;
210 const char *grp_name
= tracing_group
;
212 /* Get GID of group 'tracing' */
213 grp_tracing
= getgrnam(grp_name
);
215 /* If grp_tracing is NULL, the group does not exist. */
219 /* Get number of supplementary group IDs */
220 grp_list_size
= getgroups(0, NULL
);
221 if (grp_list_size
< 0) {
226 /* Alloc group list of the right size */
227 grp_list
= zmalloc(grp_list_size
* sizeof(gid_t
));
232 grp_id
= getgroups(grp_list_size
, grp_list
);
238 for (i
= 0; i
< grp_list_size
; i
++) {
239 if (grp_list
[i
] == grp_tracing
->gr_gid
) {
253 * Try connect to session daemon with sock_path.
255 * Return 0 on success, else -1
257 static int try_connect_sessiond(const char *sock_path
)
261 /* If socket exist, we check if the daemon listens for connect. */
262 ret
= access(sock_path
, F_OK
);
268 ret
= lttcomm_connect_unix_sock(sock_path
);
274 ret
= lttcomm_close_unix_sock(ret
);
276 perror("lttcomm_close_unix_sock");
286 * Set sessiond socket path by putting it in the global sessiond_sock_path
289 * Returns 0 on success, negative value on failure (the sessiond socket path
290 * is somehow too long or ENOMEM).
292 static int set_session_daemon_path(void)
294 int in_tgroup
= 0; /* In tracing group */
300 /* Are we in the tracing group ? */
301 in_tgroup
= lttng_check_tracing_group();
304 if ((uid
== 0) || in_tgroup
) {
305 lttng_ctl_copy_string(sessiond_sock_path
,
306 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
, sizeof(sessiond_sock_path
));
314 ret
= try_connect_sessiond(sessiond_sock_path
);
318 /* Global session daemon not available... */
320 /* ...or not in tracing group (and not root), default */
323 * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
324 * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
326 ret
= snprintf(sessiond_sock_path
, sizeof(sessiond_sock_path
),
327 DEFAULT_HOME_CLIENT_UNIX_SOCK
, utils_get_home_dir());
328 if ((ret
< 0) || (ret
>= sizeof(sessiond_sock_path
))) {
340 * Connect to the LTTng session daemon.
342 * On success, return 0. On error, return -1.
344 static int connect_sessiond(void)
348 /* Don't try to connect if already connected. */
353 ret
= set_session_daemon_path();
358 /* Connect to the sesssion daemon */
359 ret
= lttcomm_connect_unix_sock(sessiond_sock_path
);
364 sessiond_socket
= ret
;
374 * Clean disconnect from the session daemon.
375 * On success, return 0. On error, return -1.
377 static int disconnect_sessiond(void)
382 ret
= lttcomm_close_unix_sock(sessiond_socket
);
391 * Ask the session daemon a specific command and put the data into buf.
392 * Takes extra var. len. data as input to send to the session daemon.
394 * Return size of data (only payload, not header) or a negative error code.
397 int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg
*lsm
,
398 void *vardata
, size_t varlen
, void **buf
)
403 struct lttcomm_lttng_msg llm
;
405 ret
= connect_sessiond();
407 ret
= -LTTNG_ERR_NO_SESSIOND
;
411 /* Send command to session daemon */
412 ret
= send_session_msg(lsm
);
414 /* Ret value is a valid lttng error code. */
417 /* Send var len data */
418 ret
= send_session_varlen(vardata
, varlen
);
420 /* Ret value is a valid lttng error code. */
424 /* Get header from data transmission */
425 ret
= recv_data_sessiond(&llm
, sizeof(llm
));
427 /* Ret value is a valid lttng error code. */
431 /* Check error code if OK */
432 if (llm
.ret_code
!= LTTNG_OK
) {
437 size
= llm
.data_size
;
439 /* If client free with size 0 */
447 data
= zmalloc(size
);
453 /* Get payload data */
454 ret
= recv_data_sessiond(data
, size
);
461 * Extra protection not to dereference a NULL pointer. If buf is NULL at
462 * this point, an error is returned and data is freed.
465 ret
= -LTTNG_ERR_INVALID
;
474 disconnect_sessiond();
479 * Create lttng handle and return pointer.
480 * The returned pointer will be NULL in case of malloc() error.
482 struct lttng_handle
*lttng_create_handle(const char *session_name
,
483 struct lttng_domain
*domain
)
485 struct lttng_handle
*handle
= NULL
;
487 if (domain
== NULL
) {
491 handle
= zmalloc(sizeof(struct lttng_handle
));
492 if (handle
== NULL
) {
493 PERROR("malloc handle");
497 /* Copy session name */
498 lttng_ctl_copy_string(handle
->session_name
, session_name
,
499 sizeof(handle
->session_name
));
501 /* Copy lttng domain */
502 lttng_ctl_copy_lttng_domain(&handle
->domain
, domain
);
509 * Destroy handle by free(3) the pointer.
511 void lttng_destroy_handle(struct lttng_handle
*handle
)
517 * Register an outside consumer.
518 * Returns size of returned session payload data or a negative error code.
520 int lttng_register_consumer(struct lttng_handle
*handle
,
521 const char *socket_path
)
523 struct lttcomm_session_msg lsm
;
525 if (handle
== NULL
|| socket_path
== NULL
) {
526 return -LTTNG_ERR_INVALID
;
529 memset(&lsm
, 0, sizeof(lsm
));
530 lsm
.cmd_type
= LTTNG_REGISTER_CONSUMER
;
531 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
532 sizeof(lsm
.session
.name
));
533 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
535 lttng_ctl_copy_string(lsm
.u
.reg
.path
, socket_path
, sizeof(lsm
.u
.reg
.path
));
537 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
541 * Start tracing for all traces of the session.
542 * Returns size of returned session payload data or a negative error code.
544 int lttng_start_tracing(const char *session_name
)
546 struct lttcomm_session_msg lsm
;
548 if (session_name
== NULL
) {
549 return -LTTNG_ERR_INVALID
;
552 memset(&lsm
, 0, sizeof(lsm
));
553 lsm
.cmd_type
= LTTNG_START_TRACE
;
555 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
556 sizeof(lsm
.session
.name
));
558 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
562 * Stop tracing for all traces of the session.
564 static int _lttng_stop_tracing(const char *session_name
, int wait
)
567 struct lttcomm_session_msg lsm
;
569 if (session_name
== NULL
) {
570 return -LTTNG_ERR_INVALID
;
573 memset(&lsm
, 0, sizeof(lsm
));
574 lsm
.cmd_type
= LTTNG_STOP_TRACE
;
576 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
577 sizeof(lsm
.session
.name
));
579 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
580 if (ret
< 0 && ret
!= -LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
588 /* Check for data availability */
590 data_ret
= lttng_data_pending(session_name
);
592 /* Return the data available call error. */
598 * Data sleep time before retrying (in usec). Don't sleep if the call
599 * returned value indicates availability.
602 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME
);
604 } while (data_ret
!= 0);
612 * Stop tracing and wait for data availability.
614 int lttng_stop_tracing(const char *session_name
)
616 return _lttng_stop_tracing(session_name
, 1);
620 * Stop tracing but _don't_ wait for data availability.
622 int lttng_stop_tracing_no_wait(const char *session_name
)
624 return _lttng_stop_tracing(session_name
, 0);
628 * Add context to a channel.
630 * If the given channel is NULL, add the contexts to all channels.
631 * The event_name param is ignored.
633 * Returns the size of the returned payload data or a negative error code.
635 int lttng_add_context(struct lttng_handle
*handle
,
636 struct lttng_event_context
*ctx
, const char *event_name
,
637 const char *channel_name
)
639 struct lttcomm_session_msg lsm
;
641 /* Safety check. Both are mandatory */
642 if (handle
== NULL
|| ctx
== NULL
) {
643 return -LTTNG_ERR_INVALID
;
646 memset(&lsm
, 0, sizeof(lsm
));
648 lsm
.cmd_type
= LTTNG_ADD_CONTEXT
;
650 /* If no channel name, send empty string. */
651 if (channel_name
== NULL
) {
652 lttng_ctl_copy_string(lsm
.u
.context
.channel_name
, "",
653 sizeof(lsm
.u
.context
.channel_name
));
655 lttng_ctl_copy_string(lsm
.u
.context
.channel_name
, channel_name
,
656 sizeof(lsm
.u
.context
.channel_name
));
659 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
661 memcpy(&lsm
.u
.context
.ctx
, ctx
, sizeof(struct lttng_event_context
));
663 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
664 sizeof(lsm
.session
.name
));
666 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
670 * Enable event(s) for a channel.
671 * If no event name is specified, all events are enabled.
672 * If no channel name is specified, the default 'channel0' is used.
673 * Returns size of returned session payload data or a negative error code.
675 int lttng_enable_event(struct lttng_handle
*handle
,
676 struct lttng_event
*ev
, const char *channel_name
)
678 return lttng_enable_event_with_exclusions(handle
, ev
, channel_name
,
683 * Create or enable an event with a filter expression.
685 * Return negative error value on error.
686 * Return size of returned session payload data if OK.
688 int lttng_enable_event_with_filter(struct lttng_handle
*handle
,
689 struct lttng_event
*event
, const char *channel_name
,
690 const char *filter_expression
)
692 return lttng_enable_event_with_exclusions(handle
, event
, channel_name
,
693 filter_expression
, 0, NULL
);
697 * Depending on the event, return a newly allocated JUL filter expression or
698 * NULL if not applicable.
700 * An event with NO loglevel and the name is * will return NULL.
702 static char *set_jul_filter(const char *filter
, struct lttng_event
*ev
)
705 char *jul_filter
= NULL
;
709 /* Don't add filter for the '*' event. */
710 if (ev
->name
[0] != '*') {
712 err
= asprintf(&jul_filter
, "(%s) && (logger_name == \"%s\")", filter
,
715 err
= asprintf(&jul_filter
, "logger_name == \"%s\"", ev
->name
);
723 /* Add loglevel filtering if any for the JUL domain. */
724 if (ev
->loglevel_type
!= LTTNG_EVENT_LOGLEVEL_ALL
) {
727 if (ev
->loglevel_type
== LTTNG_EVENT_LOGLEVEL_RANGE
) {
733 if (filter
|| jul_filter
) {
736 err
= asprintf(&new_filter
, "(%s) && (int_loglevel %s %d)",
737 jul_filter
? jul_filter
: filter
, op
,
742 jul_filter
= new_filter
;
744 err
= asprintf(&jul_filter
, "int_loglevel %s %d", op
,
760 * Generate the filter bytecode from a give filter expression string. Put the
761 * newly allocated parser context in ctxp and populate the lsm object with the
764 * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched.
766 static int generate_filter(char *filter_expression
,
767 struct lttcomm_session_msg
*lsm
, struct filter_parser_ctx
**ctxp
)
770 struct filter_parser_ctx
*ctx
= NULL
;
773 assert(filter_expression
);
778 * Casting const to non-const, as the underlying function will use it in
781 fmem
= lttng_fmemopen((void *) filter_expression
,
782 strlen(filter_expression
), "r");
784 fprintf(stderr
, "Error opening memory as stream\n");
785 ret
= -LTTNG_ERR_FILTER_NOMEM
;
788 ctx
= filter_parser_ctx_alloc(fmem
);
790 fprintf(stderr
, "Error allocating parser\n");
791 ret
= -LTTNG_ERR_FILTER_NOMEM
;
792 goto filter_alloc_error
;
794 ret
= filter_parser_ctx_append_ast(ctx
);
796 fprintf(stderr
, "Parse error\n");
797 ret
= -LTTNG_ERR_FILTER_INVAL
;
800 ret
= filter_visitor_set_parent(ctx
);
802 fprintf(stderr
, "Set parent error\n");
803 ret
= -LTTNG_ERR_FILTER_INVAL
;
807 ret
= filter_visitor_print_xml(ctx
, stdout
, 0);
810 fprintf(stderr
, "XML print error\n");
811 ret
= -LTTNG_ERR_FILTER_INVAL
;
816 dbg_printf("Generating IR... ");
818 ret
= filter_visitor_ir_generate(ctx
);
820 fprintf(stderr
, "Generate IR error\n");
821 ret
= -LTTNG_ERR_FILTER_INVAL
;
824 dbg_printf("done\n");
826 dbg_printf("Validating IR... ");
828 ret
= filter_visitor_ir_check_binary_op_nesting(ctx
);
830 ret
= -LTTNG_ERR_FILTER_INVAL
;
833 /* Validate strings used as literals in the expression */
834 ret
= filter_visitor_ir_validate_string(ctx
);
836 ret
= -LTTNG_ERR_FILTER_INVAL
;
839 dbg_printf("done\n");
841 dbg_printf("Generating bytecode... ");
843 ret
= filter_visitor_bytecode_generate(ctx
);
845 fprintf(stderr
, "Generate bytecode error\n");
846 ret
= -LTTNG_ERR_FILTER_INVAL
;
849 dbg_printf("done\n");
850 dbg_printf("Size of bytecode generated: %u bytes.\n",
851 bytecode_get_len(&ctx
->bytecode
->b
));
853 lsm
->u
.enable
.bytecode_len
= sizeof(ctx
->bytecode
->b
)
854 + bytecode_get_len(&ctx
->bytecode
->b
);
855 lsm
->u
.enable
.expression_len
= strlen(filter_expression
) + 1;
857 /* No need to keep the memory stream. */
858 if (fclose(fmem
) != 0) {
867 filter_parser_ctx_free(ctx
);
869 if (fclose(fmem
) != 0) {
877 * Enable event(s) for a channel, possibly with exclusions and a filter.
878 * If no event name is specified, all events are enabled.
879 * If no channel name is specified, the default name is used.
880 * If filter expression is not NULL, the filter is set for the event.
881 * If exclusion count is not zero, the exclusions are set for the event.
882 * Returns size of returned session payload data or a negative error code.
884 int lttng_enable_event_with_exclusions(struct lttng_handle
*handle
,
885 struct lttng_event
*ev
, const char *channel_name
,
886 const char *original_filter_expression
,
887 int exclusion_count
, char **exclusion_list
)
889 struct lttcomm_session_msg lsm
;
892 unsigned int free_filter_expression
= 0;
893 struct filter_parser_ctx
*ctx
= NULL
;
895 * Cast as non-const since we may replace the filter expression
896 * by a dynamically allocated string. Otherwise, the original
897 * string is not modified.
899 char *filter_expression
= (char *) original_filter_expression
;
901 if (handle
== NULL
|| ev
== NULL
) {
902 ret
= -LTTNG_ERR_INVALID
;
906 /* Empty filter string will always be rejected by the parser
907 * anyway, so treat this corner-case early to eliminate
908 * lttng_fmemopen error for 0-byte allocation.
910 if (filter_expression
&& filter_expression
[0] == '\0') {
911 ret
= -LTTNG_ERR_INVALID
;
915 memset(&lsm
, 0, sizeof(lsm
));
917 /* If no channel name, send empty string. */
918 if (channel_name
== NULL
) {
919 lttng_ctl_copy_string(lsm
.u
.enable
.channel_name
, "",
920 sizeof(lsm
.u
.enable
.channel_name
));
922 lttng_ctl_copy_string(lsm
.u
.enable
.channel_name
, channel_name
,
923 sizeof(lsm
.u
.enable
.channel_name
));
926 lsm
.cmd_type
= LTTNG_ENABLE_EVENT
;
927 if (ev
->name
[0] == '\0') {
928 /* Enable all events */
929 lttng_ctl_copy_string(ev
->name
, "*", sizeof(ev
->name
));
932 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
933 /* FIXME: copying non-packed struct to packed struct. */
934 memcpy(&lsm
.u
.enable
.event
, ev
, sizeof(lsm
.u
.enable
.event
));
936 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
937 sizeof(lsm
.session
.name
));
938 lsm
.u
.enable
.exclusion_count
= exclusion_count
;
939 lsm
.u
.enable
.bytecode_len
= 0;
942 * For the JUL domain, a filter is enforced except for the enable all
943 * event. This is done to avoid having the event in all sessions thus
944 * filtering by logger name.
946 if (exclusion_count
== 0 && filter_expression
== NULL
&&
947 (handle
->domain
.type
!= LTTNG_DOMAIN_JUL
&&
948 handle
->domain
.type
!= LTTNG_DOMAIN_LOG4J
)) {
953 * We have either a filter or some exclusions, so we need to set up
954 * a variable-length memory block from where to send the data
957 /* Parse filter expression */
958 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
959 || handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
) {
960 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
||
961 handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
) {
964 /* Setup JUL filter if needed. */
965 jul_filter
= set_jul_filter(filter_expression
, ev
);
967 if (!filter_expression
) {
968 /* No JUL and no filter, just skip everything below. */
973 * With a JUL filter, the original filter has been added to it
974 * thus replace the filter expression.
976 filter_expression
= jul_filter
;
977 free_filter_expression
= 1;
981 ret
= generate_filter(filter_expression
, &lsm
, &ctx
);
987 varlen_data
= zmalloc(lsm
.u
.enable
.bytecode_len
988 + lsm
.u
.enable
.expression_len
989 + LTTNG_SYMBOL_NAME_LEN
* exclusion_count
);
991 ret
= -LTTNG_ERR_EXCLUSION_NOMEM
;
995 /* Put exclusion names first in the data */
996 while (exclusion_count
--) {
997 strncpy(varlen_data
+ LTTNG_SYMBOL_NAME_LEN
* exclusion_count
,
998 *(exclusion_list
+ exclusion_count
), LTTNG_SYMBOL_NAME_LEN
);
1000 /* Add filter expression next */
1001 if (lsm
.u
.enable
.expression_len
!= 0) {
1003 + LTTNG_SYMBOL_NAME_LEN
* lsm
.u
.enable
.exclusion_count
,
1005 lsm
.u
.enable
.expression_len
);
1007 /* Add filter bytecode next */
1008 if (ctx
&& lsm
.u
.enable
.bytecode_len
!= 0) {
1010 + LTTNG_SYMBOL_NAME_LEN
* lsm
.u
.enable
.exclusion_count
1011 + lsm
.u
.enable
.expression_len
,
1013 lsm
.u
.enable
.bytecode_len
);
1016 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, varlen_data
,
1017 (LTTNG_SYMBOL_NAME_LEN
* lsm
.u
.enable
.exclusion_count
) +
1018 lsm
.u
.enable
.bytecode_len
+ lsm
.u
.enable
.expression_len
, NULL
);
1022 if (filter_expression
&& ctx
) {
1023 filter_bytecode_free(ctx
);
1024 filter_ir_free(ctx
);
1025 filter_parser_ctx_free(ctx
);
1028 if (free_filter_expression
) {
1030 * The filter expression has been replaced and must be freed as it is
1031 * not the original filter expression received as a parameter.
1033 free(filter_expression
);
1037 * Return directly to the caller and don't ask the sessiond since something
1038 * went wrong in the parsing of data above.
1043 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1047 int lttng_disable_event_ext(struct lttng_handle
*handle
,
1048 struct lttng_event
*ev
, const char *channel_name
,
1049 const char *original_filter_expression
)
1051 struct lttcomm_session_msg lsm
;
1054 unsigned int free_filter_expression
= 0;
1055 struct filter_parser_ctx
*ctx
= NULL
;
1057 * Cast as non-const since we may replace the filter expression
1058 * by a dynamically allocated string. Otherwise, the original
1059 * string is not modified.
1061 char *filter_expression
= (char *) original_filter_expression
;
1063 if (handle
== NULL
|| ev
== NULL
) {
1064 ret
= -LTTNG_ERR_INVALID
;
1068 /* Empty filter string will always be rejected by the parser
1069 * anyway, so treat this corner-case early to eliminate
1070 * lttng_fmemopen error for 0-byte allocation.
1072 if (filter_expression
&& filter_expression
[0] == '\0') {
1073 ret
= -LTTNG_ERR_INVALID
;
1077 memset(&lsm
, 0, sizeof(lsm
));
1079 /* If no channel name, send empty string. */
1080 if (channel_name
== NULL
) {
1081 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, "",
1082 sizeof(lsm
.u
.disable
.channel_name
));
1084 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, channel_name
,
1085 sizeof(lsm
.u
.disable
.channel_name
));
1088 lsm
.cmd_type
= LTTNG_DISABLE_EVENT
;
1089 if (ev
->name
[0] == '\0') {
1090 /* Disable all events */
1091 lttng_ctl_copy_string(ev
->name
, "*", sizeof(ev
->name
));
1094 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1095 /* FIXME: copying non-packed struct to packed struct. */
1096 memcpy(&lsm
.u
.disable
.event
, ev
, sizeof(lsm
.u
.disable
.event
));
1098 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1099 sizeof(lsm
.session
.name
));
1100 lsm
.u
.disable
.bytecode_len
= 0;
1103 * For the JUL domain, a filter is enforced except for the
1104 * disable all event. This is done to avoid having the event in
1105 * all sessions thus filtering by logger name.
1107 if (filter_expression
== NULL
&&
1108 (handle
->domain
.type
!= LTTNG_DOMAIN_JUL
&&
1109 handle
->domain
.type
!= LTTNG_DOMAIN_LOG4J
)) {
1114 * We have a filter, so we need to set up a variable-length
1115 * memory block from where to send the data.
1118 /* Parse filter expression */
1119 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
1120 || handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
) {
1121 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
||
1122 handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
) {
1125 /* Setup JUL filter if needed. */
1126 jul_filter
= set_jul_filter(filter_expression
, ev
);
1128 if (!filter_expression
) {
1129 /* No JUL and no filter, just skip everything below. */
1134 * With a JUL filter, the original filter has been added to it
1135 * thus replace the filter expression.
1137 filter_expression
= jul_filter
;
1138 free_filter_expression
= 1;
1142 ret
= generate_filter(filter_expression
, &lsm
, &ctx
);
1148 varlen_data
= zmalloc(lsm
.u
.disable
.bytecode_len
1149 + lsm
.u
.disable
.expression_len
);
1151 ret
= -LTTNG_ERR_EXCLUSION_NOMEM
;
1155 /* Add filter expression */
1156 if (lsm
.u
.disable
.expression_len
!= 0) {
1159 lsm
.u
.disable
.expression_len
);
1161 /* Add filter bytecode next */
1162 if (ctx
&& lsm
.u
.disable
.bytecode_len
!= 0) {
1164 + lsm
.u
.disable
.expression_len
,
1166 lsm
.u
.disable
.bytecode_len
);
1169 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, varlen_data
,
1170 lsm
.u
.disable
.bytecode_len
+ lsm
.u
.disable
.expression_len
, NULL
);
1174 if (filter_expression
&& ctx
) {
1175 filter_bytecode_free(ctx
);
1176 filter_ir_free(ctx
);
1177 filter_parser_ctx_free(ctx
);
1180 if (free_filter_expression
) {
1182 * The filter expression has been replaced and must be freed as it is
1183 * not the original filter expression received as a parameter.
1185 free(filter_expression
);
1189 * Return directly to the caller and don't ask the sessiond since something
1190 * went wrong in the parsing of data above.
1195 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1200 * Disable event(s) of a channel and domain.
1201 * If no event name is specified, all events are disabled.
1202 * If no channel name is specified, the default 'channel0' is used.
1203 * Returns size of returned session payload data or a negative error code.
1205 int lttng_disable_event(struct lttng_handle
*handle
, const char *name
,
1206 const char *channel_name
)
1208 struct lttng_event ev
;
1210 memset(&ev
, 0, sizeof(ev
));
1212 ev
.type
= LTTNG_EVENT_ALL
;
1213 lttng_ctl_copy_string(ev
.name
, name
, sizeof(ev
.name
));
1214 return lttng_disable_event_ext(handle
, &ev
, channel_name
, NULL
);
1218 * Enable channel per domain
1219 * Returns size of returned session payload data or a negative error code.
1221 int lttng_enable_channel(struct lttng_handle
*handle
,
1222 struct lttng_channel
*chan
)
1224 struct lttcomm_session_msg lsm
;
1227 * NULL arguments are forbidden. No default values.
1229 if (handle
== NULL
|| chan
== NULL
) {
1230 return -LTTNG_ERR_INVALID
;
1233 memset(&lsm
, 0, sizeof(lsm
));
1235 memcpy(&lsm
.u
.channel
.chan
, chan
, sizeof(lsm
.u
.channel
.chan
));
1237 lsm
.cmd_type
= LTTNG_ENABLE_CHANNEL
;
1239 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1241 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1242 sizeof(lsm
.session
.name
));
1244 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1248 * All tracing will be stopped for registered events of the channel.
1249 * Returns size of returned session payload data or a negative error code.
1251 int lttng_disable_channel(struct lttng_handle
*handle
, const char *name
)
1253 struct lttcomm_session_msg lsm
;
1255 /* Safety check. Both are mandatory */
1256 if (handle
== NULL
|| name
== NULL
) {
1257 return -LTTNG_ERR_INVALID
;
1260 memset(&lsm
, 0, sizeof(lsm
));
1262 lsm
.cmd_type
= LTTNG_DISABLE_CHANNEL
;
1264 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, name
,
1265 sizeof(lsm
.u
.disable
.channel_name
));
1267 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1269 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1270 sizeof(lsm
.session
.name
));
1272 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1276 * Lists all available tracepoints of domain.
1277 * Sets the contents of the events array.
1278 * Returns the number of lttng_event entries in events;
1279 * on error, returns a negative value.
1281 int lttng_list_tracepoints(struct lttng_handle
*handle
,
1282 struct lttng_event
**events
)
1285 struct lttcomm_session_msg lsm
;
1287 if (handle
== NULL
) {
1288 return -LTTNG_ERR_INVALID
;
1291 memset(&lsm
, 0, sizeof(lsm
));
1292 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINTS
;
1293 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1295 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) events
);
1300 return ret
/ sizeof(struct lttng_event
);
1304 * Lists all available tracepoint fields of domain.
1305 * Sets the contents of the event field array.
1306 * Returns the number of lttng_event_field entries in events;
1307 * on error, returns a negative value.
1309 int lttng_list_tracepoint_fields(struct lttng_handle
*handle
,
1310 struct lttng_event_field
**fields
)
1313 struct lttcomm_session_msg lsm
;
1315 if (handle
== NULL
) {
1316 return -LTTNG_ERR_INVALID
;
1319 memset(&lsm
, 0, sizeof(lsm
));
1320 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINT_FIELDS
;
1321 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1323 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) fields
);
1328 return ret
/ sizeof(struct lttng_event_field
);
1332 * Lists all available kernel system calls. Allocates and sets the contents of
1335 * Returns the number of lttng_event entries in events; on error, returns a
1338 int lttng_list_syscalls(struct lttng_event
**events
)
1341 struct lttcomm_session_msg lsm
;
1344 return -LTTNG_ERR_INVALID
;
1347 memset(&lsm
, 0, sizeof(lsm
));
1348 lsm
.cmd_type
= LTTNG_LIST_SYSCALLS
;
1349 /* Force kernel domain for system calls. */
1350 lsm
.domain
.type
= LTTNG_DOMAIN_KERNEL
;
1352 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) events
);
1357 return ret
/ sizeof(struct lttng_event
);
1361 * Returns a human readable string describing
1362 * the error code (a negative value).
1364 const char *lttng_strerror(int code
)
1366 return error_get_str(code
);
1370 * Create a brand new session using name and url for destination.
1372 * Returns LTTNG_OK on success or a negative error code.
1374 int lttng_create_session(const char *name
, const char *url
)
1378 struct lttcomm_session_msg lsm
;
1379 struct lttng_uri
*uris
= NULL
;
1382 return -LTTNG_ERR_INVALID
;
1385 memset(&lsm
, 0, sizeof(lsm
));
1387 lsm
.cmd_type
= LTTNG_CREATE_SESSION
;
1388 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1390 /* There should never be a data URL */
1391 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1393 return -LTTNG_ERR_INVALID
;
1396 lsm
.u
.uri
.size
= size
;
1398 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1399 sizeof(struct lttng_uri
) * size
, NULL
);
1406 * Destroy session using name.
1407 * Returns size of returned session payload data or a negative error code.
1409 int lttng_destroy_session(const char *session_name
)
1411 struct lttcomm_session_msg lsm
;
1413 if (session_name
== NULL
) {
1414 return -LTTNG_ERR_INVALID
;
1417 memset(&lsm
, 0, sizeof(lsm
));
1418 lsm
.cmd_type
= LTTNG_DESTROY_SESSION
;
1420 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1421 sizeof(lsm
.session
.name
));
1423 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1427 * Ask the session daemon for all available sessions.
1428 * Sets the contents of the sessions array.
1429 * Returns the number of lttng_session entries in sessions;
1430 * on error, returns a negative value.
1432 int lttng_list_sessions(struct lttng_session
**sessions
)
1435 struct lttcomm_session_msg lsm
;
1437 memset(&lsm
, 0, sizeof(lsm
));
1438 lsm
.cmd_type
= LTTNG_LIST_SESSIONS
;
1439 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) sessions
);
1444 return ret
/ sizeof(struct lttng_session
);
1448 * Ask the session daemon for all available domains of a session.
1449 * Sets the contents of the domains array.
1450 * Returns the number of lttng_domain entries in domains;
1451 * on error, returns a negative value.
1453 int lttng_list_domains(const char *session_name
,
1454 struct lttng_domain
**domains
)
1457 struct lttcomm_session_msg lsm
;
1459 if (session_name
== NULL
) {
1460 return -LTTNG_ERR_INVALID
;
1463 memset(&lsm
, 0, sizeof(lsm
));
1464 lsm
.cmd_type
= LTTNG_LIST_DOMAINS
;
1466 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1467 sizeof(lsm
.session
.name
));
1469 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) domains
);
1474 return ret
/ sizeof(struct lttng_domain
);
1478 * Ask the session daemon for all available channels of a session.
1479 * Sets the contents of the channels array.
1480 * Returns the number of lttng_channel entries in channels;
1481 * on error, returns a negative value.
1483 int lttng_list_channels(struct lttng_handle
*handle
,
1484 struct lttng_channel
**channels
)
1487 struct lttcomm_session_msg lsm
;
1489 if (handle
== NULL
) {
1490 return -LTTNG_ERR_INVALID
;
1493 memset(&lsm
, 0, sizeof(lsm
));
1494 lsm
.cmd_type
= LTTNG_LIST_CHANNELS
;
1495 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1496 sizeof(lsm
.session
.name
));
1498 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1500 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) channels
);
1505 return ret
/ sizeof(struct lttng_channel
);
1509 * Ask the session daemon for all available events of a session channel.
1510 * Sets the contents of the events array.
1511 * Returns the number of lttng_event entries in events;
1512 * on error, returns a negative value.
1514 int lttng_list_events(struct lttng_handle
*handle
,
1515 const char *channel_name
, struct lttng_event
**events
)
1518 struct lttcomm_session_msg lsm
;
1520 /* Safety check. An handle and channel name are mandatory */
1521 if (handle
== NULL
|| channel_name
== NULL
) {
1522 return -LTTNG_ERR_INVALID
;
1525 memset(&lsm
, 0, sizeof(lsm
));
1526 lsm
.cmd_type
= LTTNG_LIST_EVENTS
;
1527 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1528 sizeof(lsm
.session
.name
));
1529 lttng_ctl_copy_string(lsm
.u
.list
.channel_name
, channel_name
,
1530 sizeof(lsm
.u
.list
.channel_name
));
1532 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1534 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) events
);
1539 return ret
/ sizeof(struct lttng_event
);
1543 * Sets the tracing_group variable with name.
1544 * This function allocates memory pointed to by tracing_group.
1545 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
1547 int lttng_set_tracing_group(const char *name
)
1550 return -LTTNG_ERR_INVALID
;
1553 if (asprintf(&tracing_group
, "%s", name
) < 0) {
1554 return -LTTNG_ERR_FATAL
;
1561 * Returns size of returned session payload data or a negative error code.
1563 int lttng_calibrate(struct lttng_handle
*handle
,
1564 struct lttng_calibrate
*calibrate
)
1566 struct lttcomm_session_msg lsm
;
1568 /* Safety check. NULL pointer are forbidden */
1569 if (handle
== NULL
|| calibrate
== NULL
) {
1570 return -LTTNG_ERR_INVALID
;
1573 memset(&lsm
, 0, sizeof(lsm
));
1574 lsm
.cmd_type
= LTTNG_CALIBRATE
;
1575 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1577 memcpy(&lsm
.u
.calibrate
, calibrate
, sizeof(lsm
.u
.calibrate
));
1579 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1583 * Set default channel attributes.
1584 * If either or both of the arguments are null, attr content is zeroe'd.
1586 void lttng_channel_set_default_attr(struct lttng_domain
*domain
,
1587 struct lttng_channel_attr
*attr
)
1590 if (attr
== NULL
|| domain
== NULL
) {
1594 memset(attr
, 0, sizeof(struct lttng_channel_attr
));
1596 /* Same for all domains. */
1597 attr
->overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
1598 attr
->tracefile_size
= DEFAULT_CHANNEL_TRACEFILE_SIZE
;
1599 attr
->tracefile_count
= DEFAULT_CHANNEL_TRACEFILE_COUNT
;
1601 switch (domain
->type
) {
1602 case LTTNG_DOMAIN_KERNEL
:
1603 attr
->switch_timer_interval
= DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER
;
1604 attr
->read_timer_interval
= DEFAULT_KERNEL_CHANNEL_READ_TIMER
;
1605 attr
->subbuf_size
= default_get_kernel_channel_subbuf_size();
1606 attr
->num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
1607 attr
->output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
1609 case LTTNG_DOMAIN_UST
:
1610 switch (domain
->buf_type
) {
1611 case LTTNG_BUFFER_PER_UID
:
1612 attr
->subbuf_size
= default_get_ust_uid_channel_subbuf_size();
1613 attr
->num_subbuf
= DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM
;
1614 attr
->output
= DEFAULT_UST_UID_CHANNEL_OUTPUT
;
1615 attr
->switch_timer_interval
= DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER
;
1616 attr
->read_timer_interval
= DEFAULT_UST_UID_CHANNEL_READ_TIMER
;
1618 case LTTNG_BUFFER_PER_PID
:
1620 attr
->subbuf_size
= default_get_ust_pid_channel_subbuf_size();
1621 attr
->num_subbuf
= DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM
;
1622 attr
->output
= DEFAULT_UST_PID_CHANNEL_OUTPUT
;
1623 attr
->switch_timer_interval
= DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER
;
1624 attr
->read_timer_interval
= DEFAULT_UST_PID_CHANNEL_READ_TIMER
;
1628 /* Default behavior: leave set to 0. */
1634 * Check if session daemon is alive.
1636 * Return 1 if alive or 0 if not.
1637 * On error returns a negative value.
1639 int lttng_session_daemon_alive(void)
1643 ret
= set_session_daemon_path();
1649 if (*sessiond_sock_path
== '\0') {
1651 * No socket path set. Weird error which means the constructor was not
1657 ret
= try_connect_sessiond(sessiond_sock_path
);
1668 * Set URL for a consumer for a session and domain.
1670 * Return 0 on success, else a negative value.
1672 int lttng_set_consumer_url(struct lttng_handle
*handle
,
1673 const char *control_url
, const char *data_url
)
1677 struct lttcomm_session_msg lsm
;
1678 struct lttng_uri
*uris
= NULL
;
1680 if (handle
== NULL
|| (control_url
== NULL
&& data_url
== NULL
)) {
1681 return -LTTNG_ERR_INVALID
;
1684 memset(&lsm
, 0, sizeof(lsm
));
1686 lsm
.cmd_type
= LTTNG_SET_CONSUMER_URI
;
1688 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1689 sizeof(lsm
.session
.name
));
1690 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1692 size
= uri_parse_str_urls(control_url
, data_url
, &uris
);
1694 return -LTTNG_ERR_INVALID
;
1697 lsm
.u
.uri
.size
= size
;
1699 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1700 sizeof(struct lttng_uri
) * size
, NULL
);
1709 int lttng_enable_consumer(struct lttng_handle
*handle
)
1717 int lttng_disable_consumer(struct lttng_handle
*handle
)
1723 * This is an extension of create session that is ONLY and SHOULD only be used
1724 * by the lttng command line program. It exists to avoid using URI parsing in
1727 * We need the date and time for the trace path subdirectory for the case where
1728 * the user does NOT define one using either -o or -U. Using the normal
1729 * lttng_create_session API call, we have no clue on the session daemon side if
1730 * the URL was generated automatically by the client or define by the user.
1732 * So this function "wrapper" is hidden from the public API, takes the datetime
1733 * string and appends it if necessary to the URI subdirectory before sending it
1734 * to the session daemon.
1736 * With this extra function, the lttng_create_session call behavior is not
1737 * changed and the timestamp is appended to the URI on the session daemon side
1740 int _lttng_create_session_ext(const char *name
, const char *url
,
1741 const char *datetime
)
1745 struct lttcomm_session_msg lsm
;
1746 struct lttng_uri
*uris
= NULL
;
1748 if (name
== NULL
|| datetime
== NULL
) {
1749 return -LTTNG_ERR_INVALID
;
1752 memset(&lsm
, 0, sizeof(lsm
));
1754 lsm
.cmd_type
= LTTNG_CREATE_SESSION
;
1755 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1757 /* There should never be a data URL */
1758 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1760 ret
= -LTTNG_ERR_INVALID
;
1764 lsm
.u
.uri
.size
= size
;
1766 if (size
> 0 && uris
[0].dtype
!= LTTNG_DST_PATH
&& strlen(uris
[0].subdir
) == 0) {
1767 /* Don't append datetime if the name was automatically created. */
1768 if (strncmp(name
, DEFAULT_SESSION_NAME
"-",
1769 strlen(DEFAULT_SESSION_NAME
) + 1)) {
1770 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s-%s",
1773 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s", name
);
1776 PERROR("snprintf uri subdir");
1777 ret
= -LTTNG_ERR_FATAL
;
1782 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1783 sizeof(struct lttng_uri
) * size
, NULL
);
1791 * For a given session name, this call checks if the data is ready to be read
1792 * or is still being extracted by the consumer(s) hence not ready to be used by
1795 int lttng_data_pending(const char *session_name
)
1798 struct lttcomm_session_msg lsm
;
1800 if (session_name
== NULL
) {
1801 return -LTTNG_ERR_INVALID
;
1804 memset(&lsm
, 0, sizeof(lsm
));
1805 lsm
.cmd_type
= LTTNG_DATA_PENDING
;
1807 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1808 sizeof(lsm
.session
.name
));
1810 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1813 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1814 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1815 * that the data is available. Yes it is hackish but for now this is the
1826 * Create a session exclusively used for snapshot.
1828 * Returns LTTNG_OK on success or a negative error code.
1830 int lttng_create_session_snapshot(const char *name
, const char *snapshot_url
)
1834 struct lttcomm_session_msg lsm
;
1835 struct lttng_uri
*uris
= NULL
;
1838 return -LTTNG_ERR_INVALID
;
1841 memset(&lsm
, 0, sizeof(lsm
));
1843 lsm
.cmd_type
= LTTNG_CREATE_SESSION_SNAPSHOT
;
1844 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1846 size
= uri_parse_str_urls(snapshot_url
, NULL
, &uris
);
1848 return -LTTNG_ERR_INVALID
;
1851 lsm
.u
.uri
.size
= size
;
1853 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1854 sizeof(struct lttng_uri
) * size
, NULL
);
1861 * Create a session exclusively used for live.
1863 * Returns LTTNG_OK on success or a negative error code.
1865 int lttng_create_session_live(const char *name
, const char *url
,
1866 unsigned int timer_interval
)
1870 struct lttcomm_session_msg lsm
;
1871 struct lttng_uri
*uris
= NULL
;
1874 return -LTTNG_ERR_INVALID
;
1877 memset(&lsm
, 0, sizeof(lsm
));
1879 lsm
.cmd_type
= LTTNG_CREATE_SESSION_LIVE
;
1880 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1883 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1885 ret
= -LTTNG_ERR_INVALID
;
1889 /* file:// is not accepted for live session. */
1890 if (uris
[0].dtype
== LTTNG_DST_PATH
) {
1891 ret
= -LTTNG_ERR_INVALID
;
1898 lsm
.u
.session_live
.nb_uri
= size
;
1899 lsm
.u
.session_live
.timer_interval
= timer_interval
;
1901 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1902 sizeof(struct lttng_uri
) * size
, NULL
);
1912 static void __attribute__((constructor
)) init()
1914 /* Set default session group */
1915 lttng_set_tracing_group(DEFAULT_TRACING_GROUP
);
1921 static void __attribute__((destructor
)) lttng_ctl_exit()
1923 free(tracing_group
);