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
= malloc(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
= (void*) malloc(size
);
449 /* Get payload data */
450 ret
= recv_data_sessiond(data
, size
);
457 * Extra protection not to dereference a NULL pointer. If buf is NULL at
458 * this point, an error is returned and data is freed.
461 ret
= -LTTNG_ERR_INVALID
;
470 disconnect_sessiond();
475 * Create lttng handle and return pointer.
476 * The returned pointer will be NULL in case of malloc() error.
478 struct lttng_handle
*lttng_create_handle(const char *session_name
,
479 struct lttng_domain
*domain
)
481 struct lttng_handle
*handle
= NULL
;
483 if (domain
== NULL
) {
487 handle
= malloc(sizeof(struct lttng_handle
));
488 if (handle
== NULL
) {
489 PERROR("malloc handle");
493 /* Copy session name */
494 lttng_ctl_copy_string(handle
->session_name
, session_name
,
495 sizeof(handle
->session_name
));
497 /* Copy lttng domain */
498 lttng_ctl_copy_lttng_domain(&handle
->domain
, domain
);
505 * Destroy handle by free(3) the pointer.
507 void lttng_destroy_handle(struct lttng_handle
*handle
)
513 * Register an outside consumer.
514 * Returns size of returned session payload data or a negative error code.
516 int lttng_register_consumer(struct lttng_handle
*handle
,
517 const char *socket_path
)
519 struct lttcomm_session_msg lsm
;
521 if (handle
== NULL
|| socket_path
== NULL
) {
522 return -LTTNG_ERR_INVALID
;
525 memset(&lsm
, 0, sizeof(lsm
));
526 lsm
.cmd_type
= LTTNG_REGISTER_CONSUMER
;
527 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
528 sizeof(lsm
.session
.name
));
529 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
531 lttng_ctl_copy_string(lsm
.u
.reg
.path
, socket_path
, sizeof(lsm
.u
.reg
.path
));
533 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
537 * Start tracing for all traces of the session.
538 * Returns size of returned session payload data or a negative error code.
540 int lttng_start_tracing(const char *session_name
)
542 struct lttcomm_session_msg lsm
;
544 if (session_name
== NULL
) {
545 return -LTTNG_ERR_INVALID
;
548 memset(&lsm
, 0, sizeof(lsm
));
549 lsm
.cmd_type
= LTTNG_START_TRACE
;
551 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
552 sizeof(lsm
.session
.name
));
554 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
558 * Stop tracing for all traces of the session.
560 static int _lttng_stop_tracing(const char *session_name
, int wait
)
563 struct lttcomm_session_msg lsm
;
565 if (session_name
== NULL
) {
566 return -LTTNG_ERR_INVALID
;
569 memset(&lsm
, 0, sizeof(lsm
));
570 lsm
.cmd_type
= LTTNG_STOP_TRACE
;
572 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
573 sizeof(lsm
.session
.name
));
575 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
576 if (ret
< 0 && ret
!= -LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
584 /* Check for data availability */
586 data_ret
= lttng_data_pending(session_name
);
588 /* Return the data available call error. */
594 * Data sleep time before retrying (in usec). Don't sleep if the call
595 * returned value indicates availability.
598 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME
);
600 } while (data_ret
!= 0);
608 * Stop tracing and wait for data availability.
610 int lttng_stop_tracing(const char *session_name
)
612 return _lttng_stop_tracing(session_name
, 1);
616 * Stop tracing but _don't_ wait for data availability.
618 int lttng_stop_tracing_no_wait(const char *session_name
)
620 return _lttng_stop_tracing(session_name
, 0);
624 * Add context to a channel.
626 * If the given channel is NULL, add the contexts to all channels.
627 * The event_name param is ignored.
629 * Returns the size of the returned payload data or a negative error code.
631 int lttng_add_context(struct lttng_handle
*handle
,
632 struct lttng_event_context
*ctx
, const char *event_name
,
633 const char *channel_name
)
635 struct lttcomm_session_msg lsm
;
637 /* Safety check. Both are mandatory */
638 if (handle
== NULL
|| ctx
== NULL
) {
639 return -LTTNG_ERR_INVALID
;
642 memset(&lsm
, 0, sizeof(lsm
));
644 lsm
.cmd_type
= LTTNG_ADD_CONTEXT
;
646 /* If no channel name, send empty string. */
647 if (channel_name
== NULL
) {
648 lttng_ctl_copy_string(lsm
.u
.context
.channel_name
, "",
649 sizeof(lsm
.u
.context
.channel_name
));
651 lttng_ctl_copy_string(lsm
.u
.context
.channel_name
, channel_name
,
652 sizeof(lsm
.u
.context
.channel_name
));
655 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
657 memcpy(&lsm
.u
.context
.ctx
, ctx
, sizeof(struct lttng_event_context
));
659 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
660 sizeof(lsm
.session
.name
));
662 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
666 * Enable event(s) for a channel.
667 * If no event name is specified, all events are enabled.
668 * If no channel name is specified, the default 'channel0' is used.
669 * Returns size of returned session payload data or a negative error code.
671 int lttng_enable_event(struct lttng_handle
*handle
,
672 struct lttng_event
*ev
, const char *channel_name
)
674 return lttng_enable_event_with_exclusions(handle
, ev
, channel_name
,
679 * Create or enable an event with a filter expression.
681 * Return negative error value on error.
682 * Return size of returned session payload data if OK.
684 int lttng_enable_event_with_filter(struct lttng_handle
*handle
,
685 struct lttng_event
*event
, const char *channel_name
,
686 const char *filter_expression
)
688 return lttng_enable_event_with_exclusions(handle
, event
, channel_name
,
689 filter_expression
, 0, NULL
);
693 * Depending on the event, return a newly allocated JUL filter expression or
694 * NULL if not applicable.
696 * An event with NO loglevel and the name is * will return NULL.
698 static char *set_jul_filter(const char *filter
, struct lttng_event
*ev
)
701 char *jul_filter
= NULL
;
705 /* Don't add filter for the '*' event. */
706 if (ev
->name
[0] != '*') {
708 err
= asprintf(&jul_filter
, "(%s) && (logger_name == \"%s\")", filter
,
711 err
= asprintf(&jul_filter
, "logger_name == \"%s\"", ev
->name
);
719 /* Add loglevel filtering if any for the JUL domain. */
720 if (ev
->loglevel_type
!= LTTNG_EVENT_LOGLEVEL_ALL
) {
723 if (ev
->loglevel_type
== LTTNG_EVENT_LOGLEVEL_RANGE
) {
729 if (filter
|| jul_filter
) {
732 err
= asprintf(&new_filter
, "(%s) && (int_loglevel %s %d)",
733 jul_filter
? jul_filter
: filter
, op
,
738 jul_filter
= new_filter
;
740 err
= asprintf(&jul_filter
, "int_loglevel %s %d", op
,
756 * Generate the filter bytecode from a give filter expression string. Put the
757 * newly allocated parser context in ctxp and populate the lsm object with the
760 * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched.
762 static int generate_filter(char *filter_expression
,
763 struct lttcomm_session_msg
*lsm
, struct filter_parser_ctx
**ctxp
)
766 struct filter_parser_ctx
*ctx
= NULL
;
769 assert(filter_expression
);
774 * Casting const to non-const, as the underlying function will use it in
777 fmem
= lttng_fmemopen((void *) filter_expression
,
778 strlen(filter_expression
), "r");
780 fprintf(stderr
, "Error opening memory as stream\n");
781 ret
= -LTTNG_ERR_FILTER_NOMEM
;
784 ctx
= filter_parser_ctx_alloc(fmem
);
786 fprintf(stderr
, "Error allocating parser\n");
787 ret
= -LTTNG_ERR_FILTER_NOMEM
;
788 goto filter_alloc_error
;
790 ret
= filter_parser_ctx_append_ast(ctx
);
792 fprintf(stderr
, "Parse error\n");
793 ret
= -LTTNG_ERR_FILTER_INVAL
;
796 ret
= filter_visitor_set_parent(ctx
);
798 fprintf(stderr
, "Set parent error\n");
799 ret
= -LTTNG_ERR_FILTER_INVAL
;
803 ret
= filter_visitor_print_xml(ctx
, stdout
, 0);
806 fprintf(stderr
, "XML print error\n");
807 ret
= -LTTNG_ERR_FILTER_INVAL
;
812 dbg_printf("Generating IR... ");
814 ret
= filter_visitor_ir_generate(ctx
);
816 fprintf(stderr
, "Generate IR error\n");
817 ret
= -LTTNG_ERR_FILTER_INVAL
;
820 dbg_printf("done\n");
822 dbg_printf("Validating IR... ");
824 ret
= filter_visitor_ir_check_binary_op_nesting(ctx
);
826 ret
= -LTTNG_ERR_FILTER_INVAL
;
829 /* Validate strings used as literals in the expression */
830 ret
= filter_visitor_ir_validate_string(ctx
);
832 ret
= -LTTNG_ERR_FILTER_INVAL
;
835 dbg_printf("done\n");
837 dbg_printf("Generating bytecode... ");
839 ret
= filter_visitor_bytecode_generate(ctx
);
841 fprintf(stderr
, "Generate bytecode error\n");
842 ret
= -LTTNG_ERR_FILTER_INVAL
;
845 dbg_printf("done\n");
846 dbg_printf("Size of bytecode generated: %u bytes.\n",
847 bytecode_get_len(&ctx
->bytecode
->b
));
849 lsm
->u
.enable
.bytecode_len
= sizeof(ctx
->bytecode
->b
)
850 + bytecode_get_len(&ctx
->bytecode
->b
);
851 lsm
->u
.enable
.expression_len
= strlen(filter_expression
) + 1;
853 /* No need to keep the memory stream. */
854 if (fclose(fmem
) != 0) {
863 filter_parser_ctx_free(ctx
);
865 if (fclose(fmem
) != 0) {
873 * Enable event(s) for a channel, possibly with exclusions and a filter.
874 * If no event name is specified, all events are enabled.
875 * If no channel name is specified, the default name is used.
876 * If filter expression is not NULL, the filter is set for the event.
877 * If exclusion count is not zero, the exclusions are set for the event.
878 * Returns size of returned session payload data or a negative error code.
880 int lttng_enable_event_with_exclusions(struct lttng_handle
*handle
,
881 struct lttng_event
*ev
, const char *channel_name
,
882 const char *original_filter_expression
,
883 int exclusion_count
, char **exclusion_list
)
885 struct lttcomm_session_msg lsm
;
888 unsigned int free_filter_expression
= 0;
889 struct filter_parser_ctx
*ctx
= NULL
;
891 * Cast as non-const since we may replace the filter expression
892 * by a dynamically allocated string. Otherwise, the original
893 * string is not modified.
895 char *filter_expression
= (char *) original_filter_expression
;
897 if (handle
== NULL
|| ev
== NULL
) {
898 ret
= -LTTNG_ERR_INVALID
;
902 /* Empty filter string will always be rejected by the parser
903 * anyway, so treat this corner-case early to eliminate
904 * lttng_fmemopen error for 0-byte allocation.
906 if (filter_expression
&& filter_expression
[0] == '\0') {
907 ret
= -LTTNG_ERR_INVALID
;
911 memset(&lsm
, 0, sizeof(lsm
));
913 /* If no channel name, send empty string. */
914 if (channel_name
== NULL
) {
915 lttng_ctl_copy_string(lsm
.u
.enable
.channel_name
, "",
916 sizeof(lsm
.u
.enable
.channel_name
));
918 lttng_ctl_copy_string(lsm
.u
.enable
.channel_name
, channel_name
,
919 sizeof(lsm
.u
.enable
.channel_name
));
922 lsm
.cmd_type
= LTTNG_ENABLE_EVENT
;
923 if (ev
->name
[0] == '\0') {
924 /* Enable all events */
925 lttng_ctl_copy_string(ev
->name
, "*", sizeof(ev
->name
));
928 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
929 /* FIXME: copying non-packed struct to packed struct. */
930 memcpy(&lsm
.u
.enable
.event
, ev
, sizeof(lsm
.u
.enable
.event
));
932 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
933 sizeof(lsm
.session
.name
));
934 lsm
.u
.enable
.exclusion_count
= exclusion_count
;
935 lsm
.u
.enable
.bytecode_len
= 0;
938 * For the JUL domain, a filter is enforced except for the enable all
939 * event. This is done to avoid having the event in all sessions thus
940 * filtering by logger name.
942 if (exclusion_count
== 0 && filter_expression
== NULL
&&
943 (handle
->domain
.type
!= LTTNG_DOMAIN_JUL
&&
944 handle
->domain
.type
!= LTTNG_DOMAIN_LOG4J
)) {
949 * We have either a filter or some exclusions, so we need to set up
950 * a variable-length memory block from where to send the data
953 /* Parse filter expression */
954 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
955 || handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
) {
956 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
||
957 handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
) {
960 /* Setup JUL filter if needed. */
961 jul_filter
= set_jul_filter(filter_expression
, ev
);
963 if (!filter_expression
) {
964 /* No JUL and no filter, just skip everything below. */
969 * With a JUL filter, the original filter has been added to it
970 * thus replace the filter expression.
972 filter_expression
= jul_filter
;
973 free_filter_expression
= 1;
977 ret
= generate_filter(filter_expression
, &lsm
, &ctx
);
983 varlen_data
= zmalloc(lsm
.u
.enable
.bytecode_len
984 + lsm
.u
.enable
.expression_len
985 + LTTNG_SYMBOL_NAME_LEN
* exclusion_count
);
987 ret
= -LTTNG_ERR_EXCLUSION_NOMEM
;
991 /* Put exclusion names first in the data */
992 while (exclusion_count
--) {
993 strncpy(varlen_data
+ LTTNG_SYMBOL_NAME_LEN
* exclusion_count
,
994 *(exclusion_list
+ exclusion_count
), LTTNG_SYMBOL_NAME_LEN
);
996 /* Add filter expression next */
997 if (lsm
.u
.enable
.expression_len
!= 0) {
999 + LTTNG_SYMBOL_NAME_LEN
* lsm
.u
.enable
.exclusion_count
,
1001 lsm
.u
.enable
.expression_len
);
1003 /* Add filter bytecode next */
1004 if (ctx
&& lsm
.u
.enable
.bytecode_len
!= 0) {
1006 + LTTNG_SYMBOL_NAME_LEN
* lsm
.u
.enable
.exclusion_count
1007 + lsm
.u
.enable
.expression_len
,
1009 lsm
.u
.enable
.bytecode_len
);
1012 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, varlen_data
,
1013 (LTTNG_SYMBOL_NAME_LEN
* lsm
.u
.enable
.exclusion_count
) +
1014 lsm
.u
.enable
.bytecode_len
+ lsm
.u
.enable
.expression_len
, NULL
);
1018 if (filter_expression
&& ctx
) {
1019 filter_bytecode_free(ctx
);
1020 filter_ir_free(ctx
);
1021 filter_parser_ctx_free(ctx
);
1024 if (free_filter_expression
) {
1026 * The filter expression has been replaced and must be freed as it is
1027 * not the original filter expression received as a parameter.
1029 free(filter_expression
);
1033 * Return directly to the caller and don't ask the sessiond since something
1034 * went wrong in the parsing of data above.
1039 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1043 int lttng_disable_event_ext(struct lttng_handle
*handle
,
1044 struct lttng_event
*ev
, const char *channel_name
,
1045 const char *original_filter_expression
)
1047 struct lttcomm_session_msg lsm
;
1050 unsigned int free_filter_expression
= 0;
1051 struct filter_parser_ctx
*ctx
= NULL
;
1053 * Cast as non-const since we may replace the filter expression
1054 * by a dynamically allocated string. Otherwise, the original
1055 * string is not modified.
1057 char *filter_expression
= (char *) original_filter_expression
;
1059 if (handle
== NULL
|| ev
== NULL
) {
1060 ret
= -LTTNG_ERR_INVALID
;
1064 /* Empty filter string will always be rejected by the parser
1065 * anyway, so treat this corner-case early to eliminate
1066 * lttng_fmemopen error for 0-byte allocation.
1068 if (filter_expression
&& filter_expression
[0] == '\0') {
1069 ret
= -LTTNG_ERR_INVALID
;
1073 memset(&lsm
, 0, sizeof(lsm
));
1075 /* If no channel name, send empty string. */
1076 if (channel_name
== NULL
) {
1077 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, "",
1078 sizeof(lsm
.u
.disable
.channel_name
));
1080 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, channel_name
,
1081 sizeof(lsm
.u
.disable
.channel_name
));
1084 lsm
.cmd_type
= LTTNG_DISABLE_EVENT
;
1085 if (ev
->name
[0] == '\0') {
1086 /* Disable all events */
1087 lttng_ctl_copy_string(ev
->name
, "*", sizeof(ev
->name
));
1090 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1091 /* FIXME: copying non-packed struct to packed struct. */
1092 memcpy(&lsm
.u
.disable
.event
, ev
, sizeof(lsm
.u
.disable
.event
));
1094 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1095 sizeof(lsm
.session
.name
));
1096 lsm
.u
.disable
.bytecode_len
= 0;
1099 * For the JUL domain, a filter is enforced except for the
1100 * disable all event. This is done to avoid having the event in
1101 * all sessions thus filtering by logger name.
1103 if (filter_expression
== NULL
&&
1104 (handle
->domain
.type
!= LTTNG_DOMAIN_JUL
&&
1105 handle
->domain
.type
!= LTTNG_DOMAIN_LOG4J
)) {
1110 * We have a filter, so we need to set up a variable-length
1111 * memory block from where to send the data.
1114 /* Parse filter expression */
1115 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
1116 || handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
) {
1117 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
||
1118 handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
) {
1121 /* Setup JUL filter if needed. */
1122 jul_filter
= set_jul_filter(filter_expression
, ev
);
1124 if (!filter_expression
) {
1125 /* No JUL and no filter, just skip everything below. */
1130 * With a JUL filter, the original filter has been added to it
1131 * thus replace the filter expression.
1133 filter_expression
= jul_filter
;
1134 free_filter_expression
= 1;
1138 ret
= generate_filter(filter_expression
, &lsm
, &ctx
);
1144 varlen_data
= zmalloc(lsm
.u
.disable
.bytecode_len
1145 + lsm
.u
.disable
.expression_len
);
1147 ret
= -LTTNG_ERR_EXCLUSION_NOMEM
;
1151 /* Add filter expression */
1152 if (lsm
.u
.disable
.expression_len
!= 0) {
1155 lsm
.u
.disable
.expression_len
);
1157 /* Add filter bytecode next */
1158 if (ctx
&& lsm
.u
.disable
.bytecode_len
!= 0) {
1160 + lsm
.u
.disable
.expression_len
,
1162 lsm
.u
.disable
.bytecode_len
);
1165 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, varlen_data
,
1166 lsm
.u
.disable
.bytecode_len
+ lsm
.u
.disable
.expression_len
, NULL
);
1170 if (filter_expression
&& ctx
) {
1171 filter_bytecode_free(ctx
);
1172 filter_ir_free(ctx
);
1173 filter_parser_ctx_free(ctx
);
1176 if (free_filter_expression
) {
1178 * The filter expression has been replaced and must be freed as it is
1179 * not the original filter expression received as a parameter.
1181 free(filter_expression
);
1185 * Return directly to the caller and don't ask the sessiond since something
1186 * went wrong in the parsing of data above.
1191 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1196 * Disable event(s) of a channel and domain.
1197 * If no event name is specified, all events are disabled.
1198 * If no channel name is specified, the default 'channel0' is used.
1199 * Returns size of returned session payload data or a negative error code.
1201 int lttng_disable_event(struct lttng_handle
*handle
, const char *name
,
1202 const char *channel_name
)
1204 struct lttng_event ev
;
1206 memset(&ev
, 0, sizeof(ev
));
1207 ev
.type
= LTTNG_EVENT_ALL
;
1208 lttng_ctl_copy_string(ev
.name
, name
, sizeof(ev
.name
));
1209 return lttng_disable_event_ext(handle
, &ev
, channel_name
, NULL
);
1213 * Enable channel per domain
1214 * Returns size of returned session payload data or a negative error code.
1216 int lttng_enable_channel(struct lttng_handle
*handle
,
1217 struct lttng_channel
*chan
)
1219 struct lttcomm_session_msg lsm
;
1222 * NULL arguments are forbidden. No default values.
1224 if (handle
== NULL
|| chan
== NULL
) {
1225 return -LTTNG_ERR_INVALID
;
1228 memset(&lsm
, 0, sizeof(lsm
));
1230 memcpy(&lsm
.u
.channel
.chan
, chan
, sizeof(lsm
.u
.channel
.chan
));
1232 lsm
.cmd_type
= LTTNG_ENABLE_CHANNEL
;
1234 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1236 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1237 sizeof(lsm
.session
.name
));
1239 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1243 * All tracing will be stopped for registered events of the channel.
1244 * Returns size of returned session payload data or a negative error code.
1246 int lttng_disable_channel(struct lttng_handle
*handle
, const char *name
)
1248 struct lttcomm_session_msg lsm
;
1250 /* Safety check. Both are mandatory */
1251 if (handle
== NULL
|| name
== NULL
) {
1252 return -LTTNG_ERR_INVALID
;
1255 memset(&lsm
, 0, sizeof(lsm
));
1257 lsm
.cmd_type
= LTTNG_DISABLE_CHANNEL
;
1259 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, name
,
1260 sizeof(lsm
.u
.disable
.channel_name
));
1262 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1264 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1265 sizeof(lsm
.session
.name
));
1267 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1271 * Lists all available tracepoints of domain.
1272 * Sets the contents of the events array.
1273 * Returns the number of lttng_event entries in events;
1274 * on error, returns a negative value.
1276 int lttng_list_tracepoints(struct lttng_handle
*handle
,
1277 struct lttng_event
**events
)
1280 struct lttcomm_session_msg lsm
;
1282 if (handle
== NULL
) {
1283 return -LTTNG_ERR_INVALID
;
1286 memset(&lsm
, 0, sizeof(lsm
));
1287 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINTS
;
1288 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1290 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) events
);
1295 return ret
/ sizeof(struct lttng_event
);
1299 * Lists all available tracepoint fields of domain.
1300 * Sets the contents of the event field array.
1301 * Returns the number of lttng_event_field entries in events;
1302 * on error, returns a negative value.
1304 int lttng_list_tracepoint_fields(struct lttng_handle
*handle
,
1305 struct lttng_event_field
**fields
)
1308 struct lttcomm_session_msg lsm
;
1310 if (handle
== NULL
) {
1311 return -LTTNG_ERR_INVALID
;
1314 memset(&lsm
, 0, sizeof(lsm
));
1315 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINT_FIELDS
;
1316 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1318 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) fields
);
1323 return ret
/ sizeof(struct lttng_event_field
);
1327 * Lists all available kernel system calls. Allocates and sets the contents of
1330 * Returns the number of lttng_event entries in events; on error, returns a
1333 int lttng_list_syscalls(struct lttng_event
**events
)
1336 struct lttcomm_session_msg lsm
;
1339 return -LTTNG_ERR_INVALID
;
1342 memset(&lsm
, 0, sizeof(lsm
));
1343 lsm
.cmd_type
= LTTNG_LIST_SYSCALLS
;
1344 /* Force kernel domain for system calls. */
1345 lsm
.domain
.type
= LTTNG_DOMAIN_KERNEL
;
1347 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) events
);
1352 return ret
/ sizeof(struct lttng_event
);
1356 * Returns a human readable string describing
1357 * the error code (a negative value).
1359 const char *lttng_strerror(int code
)
1361 return error_get_str(code
);
1365 * Create a brand new session using name and url for destination.
1367 * Returns LTTNG_OK on success or a negative error code.
1369 int lttng_create_session(const char *name
, const char *url
)
1373 struct lttcomm_session_msg lsm
;
1374 struct lttng_uri
*uris
= NULL
;
1377 return -LTTNG_ERR_INVALID
;
1380 memset(&lsm
, 0, sizeof(lsm
));
1382 lsm
.cmd_type
= LTTNG_CREATE_SESSION
;
1383 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1385 /* There should never be a data URL */
1386 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1388 return -LTTNG_ERR_INVALID
;
1391 lsm
.u
.uri
.size
= size
;
1393 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1394 sizeof(struct lttng_uri
) * size
, NULL
);
1401 * Destroy session using name.
1402 * Returns size of returned session payload data or a negative error code.
1404 int lttng_destroy_session(const char *session_name
)
1406 struct lttcomm_session_msg lsm
;
1408 if (session_name
== NULL
) {
1409 return -LTTNG_ERR_INVALID
;
1412 memset(&lsm
, 0, sizeof(lsm
));
1413 lsm
.cmd_type
= LTTNG_DESTROY_SESSION
;
1415 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1416 sizeof(lsm
.session
.name
));
1418 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1422 * Ask the session daemon for all available sessions.
1423 * Sets the contents of the sessions array.
1424 * Returns the number of lttng_session entries in sessions;
1425 * on error, returns a negative value.
1427 int lttng_list_sessions(struct lttng_session
**sessions
)
1430 struct lttcomm_session_msg lsm
;
1432 memset(&lsm
, 0, sizeof(lsm
));
1433 lsm
.cmd_type
= LTTNG_LIST_SESSIONS
;
1434 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) sessions
);
1439 return ret
/ sizeof(struct lttng_session
);
1443 * Ask the session daemon for all available domains of a session.
1444 * Sets the contents of the domains array.
1445 * Returns the number of lttng_domain entries in domains;
1446 * on error, returns a negative value.
1448 int lttng_list_domains(const char *session_name
,
1449 struct lttng_domain
**domains
)
1452 struct lttcomm_session_msg lsm
;
1454 if (session_name
== NULL
) {
1455 return -LTTNG_ERR_INVALID
;
1458 memset(&lsm
, 0, sizeof(lsm
));
1459 lsm
.cmd_type
= LTTNG_LIST_DOMAINS
;
1461 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1462 sizeof(lsm
.session
.name
));
1464 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) domains
);
1469 return ret
/ sizeof(struct lttng_domain
);
1473 * Ask the session daemon for all available channels of a session.
1474 * Sets the contents of the channels array.
1475 * Returns the number of lttng_channel entries in channels;
1476 * on error, returns a negative value.
1478 int lttng_list_channels(struct lttng_handle
*handle
,
1479 struct lttng_channel
**channels
)
1482 struct lttcomm_session_msg lsm
;
1484 if (handle
== NULL
) {
1485 return -LTTNG_ERR_INVALID
;
1488 memset(&lsm
, 0, sizeof(lsm
));
1489 lsm
.cmd_type
= LTTNG_LIST_CHANNELS
;
1490 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1491 sizeof(lsm
.session
.name
));
1493 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1495 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) channels
);
1500 return ret
/ sizeof(struct lttng_channel
);
1504 * Ask the session daemon for all available events of a session channel.
1505 * Sets the contents of the events array.
1506 * Returns the number of lttng_event entries in events;
1507 * on error, returns a negative value.
1509 int lttng_list_events(struct lttng_handle
*handle
,
1510 const char *channel_name
, struct lttng_event
**events
)
1513 struct lttcomm_session_msg lsm
;
1515 /* Safety check. An handle and channel name are mandatory */
1516 if (handle
== NULL
|| channel_name
== NULL
) {
1517 return -LTTNG_ERR_INVALID
;
1520 memset(&lsm
, 0, sizeof(lsm
));
1521 lsm
.cmd_type
= LTTNG_LIST_EVENTS
;
1522 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1523 sizeof(lsm
.session
.name
));
1524 lttng_ctl_copy_string(lsm
.u
.list
.channel_name
, channel_name
,
1525 sizeof(lsm
.u
.list
.channel_name
));
1527 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1529 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) events
);
1534 return ret
/ sizeof(struct lttng_event
);
1538 * Sets the tracing_group variable with name.
1539 * This function allocates memory pointed to by tracing_group.
1540 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
1542 int lttng_set_tracing_group(const char *name
)
1545 return -LTTNG_ERR_INVALID
;
1548 if (asprintf(&tracing_group
, "%s", name
) < 0) {
1549 return -LTTNG_ERR_FATAL
;
1556 * Returns size of returned session payload data or a negative error code.
1558 int lttng_calibrate(struct lttng_handle
*handle
,
1559 struct lttng_calibrate
*calibrate
)
1561 struct lttcomm_session_msg lsm
;
1563 /* Safety check. NULL pointer are forbidden */
1564 if (handle
== NULL
|| calibrate
== NULL
) {
1565 return -LTTNG_ERR_INVALID
;
1568 memset(&lsm
, 0, sizeof(lsm
));
1569 lsm
.cmd_type
= LTTNG_CALIBRATE
;
1570 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1572 memcpy(&lsm
.u
.calibrate
, calibrate
, sizeof(lsm
.u
.calibrate
));
1574 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1578 * Set default channel attributes.
1579 * If either or both of the arguments are null, attr content is zeroe'd.
1581 void lttng_channel_set_default_attr(struct lttng_domain
*domain
,
1582 struct lttng_channel_attr
*attr
)
1585 if (attr
== NULL
|| domain
== NULL
) {
1589 memset(attr
, 0, sizeof(struct lttng_channel_attr
));
1591 /* Same for all domains. */
1592 attr
->overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
1593 attr
->tracefile_size
= DEFAULT_CHANNEL_TRACEFILE_SIZE
;
1594 attr
->tracefile_count
= DEFAULT_CHANNEL_TRACEFILE_COUNT
;
1596 switch (domain
->type
) {
1597 case LTTNG_DOMAIN_KERNEL
:
1598 attr
->switch_timer_interval
= DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER
;
1599 attr
->read_timer_interval
= DEFAULT_KERNEL_CHANNEL_READ_TIMER
;
1600 attr
->subbuf_size
= default_get_kernel_channel_subbuf_size();
1601 attr
->num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
1602 attr
->output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
1604 case LTTNG_DOMAIN_UST
:
1605 switch (domain
->buf_type
) {
1606 case LTTNG_BUFFER_PER_UID
:
1607 attr
->subbuf_size
= default_get_ust_uid_channel_subbuf_size();
1608 attr
->num_subbuf
= DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM
;
1609 attr
->output
= DEFAULT_UST_UID_CHANNEL_OUTPUT
;
1610 attr
->switch_timer_interval
= DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER
;
1611 attr
->read_timer_interval
= DEFAULT_UST_UID_CHANNEL_READ_TIMER
;
1613 case LTTNG_BUFFER_PER_PID
:
1615 attr
->subbuf_size
= default_get_ust_pid_channel_subbuf_size();
1616 attr
->num_subbuf
= DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM
;
1617 attr
->output
= DEFAULT_UST_PID_CHANNEL_OUTPUT
;
1618 attr
->switch_timer_interval
= DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER
;
1619 attr
->read_timer_interval
= DEFAULT_UST_PID_CHANNEL_READ_TIMER
;
1623 /* Default behavior: leave set to 0. */
1629 * Check if session daemon is alive.
1631 * Return 1 if alive or 0 if not.
1632 * On error returns a negative value.
1634 int lttng_session_daemon_alive(void)
1638 ret
= set_session_daemon_path();
1644 if (*sessiond_sock_path
== '\0') {
1646 * No socket path set. Weird error which means the constructor was not
1652 ret
= try_connect_sessiond(sessiond_sock_path
);
1663 * Set URL for a consumer for a session and domain.
1665 * Return 0 on success, else a negative value.
1667 int lttng_set_consumer_url(struct lttng_handle
*handle
,
1668 const char *control_url
, const char *data_url
)
1672 struct lttcomm_session_msg lsm
;
1673 struct lttng_uri
*uris
= NULL
;
1675 if (handle
== NULL
|| (control_url
== NULL
&& data_url
== NULL
)) {
1676 return -LTTNG_ERR_INVALID
;
1679 memset(&lsm
, 0, sizeof(lsm
));
1681 lsm
.cmd_type
= LTTNG_SET_CONSUMER_URI
;
1683 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1684 sizeof(lsm
.session
.name
));
1685 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1687 size
= uri_parse_str_urls(control_url
, data_url
, &uris
);
1689 return -LTTNG_ERR_INVALID
;
1692 lsm
.u
.uri
.size
= size
;
1694 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1695 sizeof(struct lttng_uri
) * size
, NULL
);
1704 int lttng_enable_consumer(struct lttng_handle
*handle
)
1712 int lttng_disable_consumer(struct lttng_handle
*handle
)
1718 * This is an extension of create session that is ONLY and SHOULD only be used
1719 * by the lttng command line program. It exists to avoid using URI parsing in
1722 * We need the date and time for the trace path subdirectory for the case where
1723 * the user does NOT define one using either -o or -U. Using the normal
1724 * lttng_create_session API call, we have no clue on the session daemon side if
1725 * the URL was generated automatically by the client or define by the user.
1727 * So this function "wrapper" is hidden from the public API, takes the datetime
1728 * string and appends it if necessary to the URI subdirectory before sending it
1729 * to the session daemon.
1731 * With this extra function, the lttng_create_session call behavior is not
1732 * changed and the timestamp is appended to the URI on the session daemon side
1735 int _lttng_create_session_ext(const char *name
, const char *url
,
1736 const char *datetime
)
1740 struct lttcomm_session_msg lsm
;
1741 struct lttng_uri
*uris
= NULL
;
1743 if (name
== NULL
|| datetime
== NULL
) {
1744 return -LTTNG_ERR_INVALID
;
1747 memset(&lsm
, 0, sizeof(lsm
));
1749 lsm
.cmd_type
= LTTNG_CREATE_SESSION
;
1750 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1752 /* There should never be a data URL */
1753 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1755 ret
= -LTTNG_ERR_INVALID
;
1759 lsm
.u
.uri
.size
= size
;
1761 if (size
> 0 && uris
[0].dtype
!= LTTNG_DST_PATH
&& strlen(uris
[0].subdir
) == 0) {
1762 /* Don't append datetime if the name was automatically created. */
1763 if (strncmp(name
, DEFAULT_SESSION_NAME
"-",
1764 strlen(DEFAULT_SESSION_NAME
) + 1)) {
1765 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s-%s",
1768 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s", name
);
1771 PERROR("snprintf uri subdir");
1772 ret
= -LTTNG_ERR_FATAL
;
1777 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1778 sizeof(struct lttng_uri
) * size
, NULL
);
1786 * For a given session name, this call checks if the data is ready to be read
1787 * or is still being extracted by the consumer(s) hence not ready to be used by
1790 int lttng_data_pending(const char *session_name
)
1793 struct lttcomm_session_msg lsm
;
1795 if (session_name
== NULL
) {
1796 return -LTTNG_ERR_INVALID
;
1799 memset(&lsm
, 0, sizeof(lsm
));
1800 lsm
.cmd_type
= LTTNG_DATA_PENDING
;
1802 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1803 sizeof(lsm
.session
.name
));
1805 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1808 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1809 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1810 * that the data is available. Yes it is hackish but for now this is the
1821 * Create a session exclusively used for snapshot.
1823 * Returns LTTNG_OK on success or a negative error code.
1825 int lttng_create_session_snapshot(const char *name
, const char *snapshot_url
)
1829 struct lttcomm_session_msg lsm
;
1830 struct lttng_uri
*uris
= NULL
;
1833 return -LTTNG_ERR_INVALID
;
1836 memset(&lsm
, 0, sizeof(lsm
));
1838 lsm
.cmd_type
= LTTNG_CREATE_SESSION_SNAPSHOT
;
1839 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1841 size
= uri_parse_str_urls(snapshot_url
, NULL
, &uris
);
1843 return -LTTNG_ERR_INVALID
;
1846 lsm
.u
.uri
.size
= size
;
1848 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1849 sizeof(struct lttng_uri
) * size
, NULL
);
1856 * Create a session exclusively used for live.
1858 * Returns LTTNG_OK on success or a negative error code.
1860 int lttng_create_session_live(const char *name
, const char *url
,
1861 unsigned int timer_interval
)
1865 struct lttcomm_session_msg lsm
;
1866 struct lttng_uri
*uris
= NULL
;
1869 return -LTTNG_ERR_INVALID
;
1872 memset(&lsm
, 0, sizeof(lsm
));
1874 lsm
.cmd_type
= LTTNG_CREATE_SESSION_LIVE
;
1875 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1878 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1880 ret
= -LTTNG_ERR_INVALID
;
1884 /* file:// is not accepted for live session. */
1885 if (uris
[0].dtype
== LTTNG_DST_PATH
) {
1886 ret
= -LTTNG_ERR_INVALID
;
1893 lsm
.u
.session_live
.nb_uri
= size
;
1894 lsm
.u
.session_live
.timer_interval
= timer_interval
;
1896 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1897 sizeof(struct lttng_uri
) * size
, NULL
);
1907 static void __attribute__((constructor
)) init()
1909 /* Set default session group */
1910 lttng_set_tracing_group(DEFAULT_TRACING_GROUP
);
1916 static void __attribute__((destructor
)) lttng_ctl_exit()
1918 free(tracing_group
);