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
32 #include <common/common.h>
33 #include <common/defaults.h>
34 #include <common/sessiond-comm/sessiond-comm.h>
35 #include <common/uri.h>
36 #include <common/utils.h>
37 #include <lttng/lttng.h>
38 #include <lttng/health-internal.h>
40 #include "filter/filter-ast.h"
41 #include "filter/filter-parser.h"
42 #include "filter/filter-bytecode.h"
43 #include "filter/memstream.h"
44 #include "lttng-ctl-helper.h"
47 static const int print_xml
= 1;
48 #define dbg_printf(fmt, args...) \
49 printf("[debug liblttng-ctl] " fmt, ## args)
51 static const int print_xml
= 0;
52 #define dbg_printf(fmt, args...) \
54 /* do nothing but check printf format */ \
56 printf("[debug liblttnctl] " fmt, ## args); \
61 /* Socket to session daemon for communication */
62 static int sessiond_socket
;
63 static char sessiond_sock_path
[PATH_MAX
];
66 static char *tracing_group
;
72 * Those two variables are used by error.h to silent or control the verbosity of
73 * error message. They are global to the library so application linking with it
74 * are able to compile correctly and also control verbosity of the library.
77 int lttng_opt_verbose
;
81 * Copy string from src to dst and enforce null terminated byte.
84 void lttng_ctl_copy_string(char *dst
, const char *src
, size_t len
)
87 strncpy(dst
, src
, len
);
88 /* Enforce the NULL terminated byte */
96 * Copy domain to lttcomm_session_msg domain.
98 * If domain is unknown, default domain will be the kernel.
101 void lttng_ctl_copy_lttng_domain(struct lttng_domain
*dst
,
102 struct lttng_domain
*src
)
106 case LTTNG_DOMAIN_KERNEL
:
107 case LTTNG_DOMAIN_UST
:
108 case LTTNG_DOMAIN_JUL
:
109 case LTTNG_DOMAIN_LOG4J
:
110 case LTTNG_DOMAIN_PYTHON
:
111 memcpy(dst
, src
, sizeof(struct lttng_domain
));
114 memset(dst
, 0, sizeof(struct lttng_domain
));
121 * Send lttcomm_session_msg to the session daemon.
123 * On success, returns the number of bytes sent (>=0)
124 * On error, returns -1
126 static int send_session_msg(struct lttcomm_session_msg
*lsm
)
131 ret
= -LTTNG_ERR_NO_SESSIOND
;
135 DBG("LSM cmd type : %d", lsm
->cmd_type
);
137 ret
= lttcomm_send_creds_unix_sock(sessiond_socket
, lsm
,
138 sizeof(struct lttcomm_session_msg
));
140 ret
= -LTTNG_ERR_FATAL
;
148 * Send var len data to the session daemon.
150 * On success, returns the number of bytes sent (>=0)
151 * On error, returns -1
153 static int send_session_varlen(void *data
, size_t len
)
158 ret
= -LTTNG_ERR_NO_SESSIOND
;
167 ret
= lttcomm_send_unix_sock(sessiond_socket
, data
, len
);
169 ret
= -LTTNG_ERR_FATAL
;
177 * Receive data from the sessiond socket.
179 * On success, returns the number of bytes received (>=0)
180 * On error, returns -1 (recvmsg() error) or -ENOTCONN
182 static int recv_data_sessiond(void *buf
, size_t len
)
187 ret
= -LTTNG_ERR_NO_SESSIOND
;
191 ret
= lttcomm_recv_unix_sock(sessiond_socket
, buf
, len
);
193 ret
= -LTTNG_ERR_FATAL
;
201 * Check if we are in the specified group.
203 * If yes return 1, else return -1.
206 int lttng_check_tracing_group(void)
208 struct group
*grp_tracing
; /* no free(). See getgrnam(3) */
210 int grp_list_size
, grp_id
, i
;
212 const char *grp_name
= tracing_group
;
214 /* Get GID of group 'tracing' */
215 grp_tracing
= getgrnam(grp_name
);
217 /* If grp_tracing is NULL, the group does not exist. */
221 /* Get number of supplementary group IDs */
222 grp_list_size
= getgroups(0, NULL
);
223 if (grp_list_size
< 0) {
228 /* Alloc group list of the right size */
229 grp_list
= malloc(grp_list_size
* sizeof(gid_t
));
234 grp_id
= getgroups(grp_list_size
, grp_list
);
240 for (i
= 0; i
< grp_list_size
; i
++) {
241 if (grp_list
[i
] == grp_tracing
->gr_gid
) {
255 * Try connect to session daemon with sock_path.
257 * Return 0 on success, else -1
259 static int try_connect_sessiond(const char *sock_path
)
263 /* If socket exist, we check if the daemon listens for connect. */
264 ret
= access(sock_path
, F_OK
);
270 ret
= lttcomm_connect_unix_sock(sock_path
);
276 ret
= lttcomm_close_unix_sock(ret
);
278 perror("lttcomm_close_unix_sock");
288 * Set sessiond socket path by putting it in the global sessiond_sock_path
291 * Returns 0 on success, negative value on failure (the sessiond socket path
292 * is somehow too long or ENOMEM).
294 static int set_session_daemon_path(void)
296 int in_tgroup
= 0; /* In tracing group */
302 /* Are we in the tracing group ? */
303 in_tgroup
= lttng_check_tracing_group();
306 if ((uid
== 0) || in_tgroup
) {
307 lttng_ctl_copy_string(sessiond_sock_path
,
308 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
, sizeof(sessiond_sock_path
));
316 ret
= try_connect_sessiond(sessiond_sock_path
);
320 /* Global session daemon not available... */
322 /* ...or not in tracing group (and not root), default */
325 * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
326 * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
328 ret
= snprintf(sessiond_sock_path
, sizeof(sessiond_sock_path
),
329 DEFAULT_HOME_CLIENT_UNIX_SOCK
, utils_get_home_dir());
330 if ((ret
< 0) || (ret
>= sizeof(sessiond_sock_path
))) {
342 * Connect to the LTTng session daemon.
344 * On success, return 0. On error, return -1.
346 static int connect_sessiond(void)
350 /* Don't try to connect if already connected. */
355 ret
= set_session_daemon_path();
360 /* Connect to the sesssion daemon */
361 ret
= lttcomm_connect_unix_sock(sessiond_sock_path
);
366 sessiond_socket
= ret
;
376 * Clean disconnect from the session daemon.
377 * On success, return 0. On error, return -1.
379 static int disconnect_sessiond(void)
384 ret
= lttcomm_close_unix_sock(sessiond_socket
);
393 * Ask the session daemon a specific command and put the data into buf.
394 * Takes extra var. len. data as input to send to the session daemon.
396 * Return size of data (only payload, not header) or a negative error code.
399 int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg
*lsm
,
400 void *vardata
, size_t varlen
, void **buf
)
405 struct lttcomm_lttng_msg llm
;
407 ret
= connect_sessiond();
409 ret
= -LTTNG_ERR_NO_SESSIOND
;
413 /* Send command to session daemon */
414 ret
= send_session_msg(lsm
);
416 /* Ret value is a valid lttng error code. */
419 /* Send var len data */
420 ret
= send_session_varlen(vardata
, varlen
);
422 /* Ret value is a valid lttng error code. */
426 /* Get header from data transmission */
427 ret
= recv_data_sessiond(&llm
, sizeof(llm
));
429 /* Ret value is a valid lttng error code. */
433 /* Check error code if OK */
434 if (llm
.ret_code
!= LTTNG_OK
) {
439 size
= llm
.data_size
;
441 /* If client free with size 0 */
449 data
= (void*) malloc(size
);
451 /* Get payload data */
452 ret
= recv_data_sessiond(data
, size
);
459 * Extra protection not to dereference a NULL pointer. If buf is NULL at
460 * this point, an error is returned and data is freed.
463 ret
= -LTTNG_ERR_INVALID
;
472 disconnect_sessiond();
477 * Create lttng handle and return pointer.
478 * The returned pointer will be NULL in case of malloc() error.
480 struct lttng_handle
*lttng_create_handle(const char *session_name
,
481 struct lttng_domain
*domain
)
483 struct lttng_handle
*handle
= NULL
;
485 if (domain
== NULL
) {
489 handle
= malloc(sizeof(struct lttng_handle
));
490 if (handle
== NULL
) {
491 PERROR("malloc handle");
495 /* Copy session name */
496 lttng_ctl_copy_string(handle
->session_name
, session_name
,
497 sizeof(handle
->session_name
));
499 /* Copy lttng domain */
500 lttng_ctl_copy_lttng_domain(&handle
->domain
, domain
);
507 * Destroy handle by free(3) the pointer.
509 void lttng_destroy_handle(struct lttng_handle
*handle
)
515 * Register an outside consumer.
516 * Returns size of returned session payload data or a negative error code.
518 int lttng_register_consumer(struct lttng_handle
*handle
,
519 const char *socket_path
)
521 struct lttcomm_session_msg lsm
;
523 if (handle
== NULL
|| socket_path
== NULL
) {
524 return -LTTNG_ERR_INVALID
;
527 memset(&lsm
, 0, sizeof(lsm
));
528 lsm
.cmd_type
= LTTNG_REGISTER_CONSUMER
;
529 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
530 sizeof(lsm
.session
.name
));
531 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
533 lttng_ctl_copy_string(lsm
.u
.reg
.path
, socket_path
, sizeof(lsm
.u
.reg
.path
));
535 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
539 * Start tracing for all traces of the session.
540 * Returns size of returned session payload data or a negative error code.
542 int lttng_start_tracing(const char *session_name
)
544 struct lttcomm_session_msg lsm
;
546 if (session_name
== NULL
) {
547 return -LTTNG_ERR_INVALID
;
550 memset(&lsm
, 0, sizeof(lsm
));
551 lsm
.cmd_type
= LTTNG_START_TRACE
;
553 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
554 sizeof(lsm
.session
.name
));
556 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
560 * Stop tracing for all traces of the session.
562 static int _lttng_stop_tracing(const char *session_name
, int wait
)
565 struct lttcomm_session_msg lsm
;
567 if (session_name
== NULL
) {
568 return -LTTNG_ERR_INVALID
;
571 memset(&lsm
, 0, sizeof(lsm
));
572 lsm
.cmd_type
= LTTNG_STOP_TRACE
;
574 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
575 sizeof(lsm
.session
.name
));
577 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
578 if (ret
< 0 && ret
!= -LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
586 /* Check for data availability */
588 data_ret
= lttng_data_pending(session_name
);
590 /* Return the data available call error. */
596 * Data sleep time before retrying (in usec). Don't sleep if the call
597 * returned value indicates availability.
600 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME
);
602 } while (data_ret
!= 0);
610 * Stop tracing and wait for data availability.
612 int lttng_stop_tracing(const char *session_name
)
614 return _lttng_stop_tracing(session_name
, 1);
618 * Stop tracing but _don't_ wait for data availability.
620 int lttng_stop_tracing_no_wait(const char *session_name
)
622 return _lttng_stop_tracing(session_name
, 0);
626 * Add context to a channel.
628 * If the given channel is NULL, add the contexts to all channels.
629 * The event_name param is ignored.
631 * Returns the size of the returned payload data or a negative error code.
633 int lttng_add_context(struct lttng_handle
*handle
,
634 struct lttng_event_context
*ctx
, const char *event_name
,
635 const char *channel_name
)
637 struct lttcomm_session_msg lsm
;
639 /* Safety check. Both are mandatory */
640 if (handle
== NULL
|| ctx
== NULL
) {
641 return -LTTNG_ERR_INVALID
;
644 memset(&lsm
, 0, sizeof(lsm
));
646 lsm
.cmd_type
= LTTNG_ADD_CONTEXT
;
648 /* If no channel name, send empty string. */
649 if (channel_name
== NULL
) {
650 lttng_ctl_copy_string(lsm
.u
.context
.channel_name
, "",
651 sizeof(lsm
.u
.context
.channel_name
));
653 lttng_ctl_copy_string(lsm
.u
.context
.channel_name
, channel_name
,
654 sizeof(lsm
.u
.context
.channel_name
));
657 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
659 memcpy(&lsm
.u
.context
.ctx
, ctx
, sizeof(struct lttng_event_context
));
661 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
662 sizeof(lsm
.session
.name
));
664 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
668 * Enable event(s) for a channel.
669 * If no event name is specified, all events are enabled.
670 * If no channel name is specified, the default 'channel0' is used.
671 * Returns size of returned session payload data or a negative error code.
673 int lttng_enable_event(struct lttng_handle
*handle
,
674 struct lttng_event
*ev
, const char *channel_name
)
676 return lttng_enable_event_with_exclusions(handle
, ev
, channel_name
,
681 * Create or enable an event with a filter expression.
683 * Return negative error value on error.
684 * Return size of returned session payload data if OK.
686 int lttng_enable_event_with_filter(struct lttng_handle
*handle
,
687 struct lttng_event
*event
, const char *channel_name
,
688 const char *filter_expression
)
690 return lttng_enable_event_with_exclusions(handle
, event
, channel_name
,
691 filter_expression
, 0, NULL
);
695 * Depending on the event, return a newly allocated agent filter expression or
696 * NULL if not applicable.
698 * An event with NO loglevel and the name is * will return NULL.
700 static char *set_agent_filter(const char *filter
, struct lttng_event
*ev
)
703 char *agent_filter
= NULL
;
707 /* Don't add filter for the '*' event. */
708 if (ev
->name
[0] != '*') {
710 err
= asprintf(&agent_filter
, "(%s) && (logger_name == \"%s\")", filter
,
713 err
= asprintf(&agent_filter
, "logger_name == \"%s\"", ev
->name
);
721 /* Add loglevel filtering if any for the JUL domain. */
722 if (ev
->loglevel_type
!= LTTNG_EVENT_LOGLEVEL_ALL
) {
725 if (ev
->loglevel_type
== LTTNG_EVENT_LOGLEVEL_RANGE
) {
731 if (filter
|| agent_filter
) {
734 err
= asprintf(&new_filter
, "(%s) && (int_loglevel %s %d)",
735 agent_filter
? agent_filter
: filter
, op
,
740 agent_filter
= new_filter
;
742 err
= asprintf(&agent_filter
, "int_loglevel %s %d", op
,
758 * Generate the filter bytecode from a give filter expression string. Put the
759 * newly allocated parser context in ctxp and populate the lsm object with the
762 * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched.
764 static int generate_filter(char *filter_expression
,
765 struct lttcomm_session_msg
*lsm
, struct filter_parser_ctx
**ctxp
)
768 struct filter_parser_ctx
*ctx
= NULL
;
771 assert(filter_expression
);
776 * Casting const to non-const, as the underlying function will use it in
779 fmem
= lttng_fmemopen((void *) filter_expression
,
780 strlen(filter_expression
), "r");
782 fprintf(stderr
, "Error opening memory as stream\n");
783 ret
= -LTTNG_ERR_FILTER_NOMEM
;
786 ctx
= filter_parser_ctx_alloc(fmem
);
788 fprintf(stderr
, "Error allocating parser\n");
789 ret
= -LTTNG_ERR_FILTER_NOMEM
;
790 goto filter_alloc_error
;
792 ret
= filter_parser_ctx_append_ast(ctx
);
794 fprintf(stderr
, "Parse error\n");
795 ret
= -LTTNG_ERR_FILTER_INVAL
;
798 ret
= filter_visitor_set_parent(ctx
);
800 fprintf(stderr
, "Set parent error\n");
801 ret
= -LTTNG_ERR_FILTER_INVAL
;
805 ret
= filter_visitor_print_xml(ctx
, stdout
, 0);
808 fprintf(stderr
, "XML print error\n");
809 ret
= -LTTNG_ERR_FILTER_INVAL
;
814 dbg_printf("Generating IR... ");
816 ret
= filter_visitor_ir_generate(ctx
);
818 fprintf(stderr
, "Generate IR error\n");
819 ret
= -LTTNG_ERR_FILTER_INVAL
;
822 dbg_printf("done\n");
824 dbg_printf("Validating IR... ");
826 ret
= filter_visitor_ir_check_binary_op_nesting(ctx
);
828 ret
= -LTTNG_ERR_FILTER_INVAL
;
831 /* Validate strings used as literals in the expression */
832 ret
= filter_visitor_ir_validate_string(ctx
);
834 ret
= -LTTNG_ERR_FILTER_INVAL
;
837 dbg_printf("done\n");
839 dbg_printf("Generating bytecode... ");
841 ret
= filter_visitor_bytecode_generate(ctx
);
843 fprintf(stderr
, "Generate bytecode error\n");
844 ret
= -LTTNG_ERR_FILTER_INVAL
;
847 dbg_printf("done\n");
848 dbg_printf("Size of bytecode generated: %u bytes.\n",
849 bytecode_get_len(&ctx
->bytecode
->b
));
851 lsm
->u
.enable
.bytecode_len
= sizeof(ctx
->bytecode
->b
)
852 + bytecode_get_len(&ctx
->bytecode
->b
);
853 lsm
->u
.enable
.expression_len
= strlen(filter_expression
) + 1;
855 /* No need to keep the memory stream. */
856 if (fclose(fmem
) != 0) {
865 filter_parser_ctx_free(ctx
);
867 if (fclose(fmem
) != 0) {
875 * Enable event(s) for a channel, possibly with exclusions and a filter.
876 * If no event name is specified, all events are enabled.
877 * If no channel name is specified, the default name is used.
878 * If filter expression is not NULL, the filter is set for the event.
879 * If exclusion count is not zero, the exclusions are set for the event.
880 * Returns size of returned session payload data or a negative error code.
882 int lttng_enable_event_with_exclusions(struct lttng_handle
*handle
,
883 struct lttng_event
*ev
, const char *channel_name
,
884 const char *original_filter_expression
,
885 int exclusion_count
, char **exclusion_list
)
887 struct lttcomm_session_msg lsm
;
890 unsigned int free_filter_expression
= 0;
891 struct filter_parser_ctx
*ctx
= NULL
;
893 * Cast as non-const since we may replace the filter expression
894 * by a dynamically allocated string. Otherwise, the original
895 * string is not modified.
897 char *filter_expression
= (char *) original_filter_expression
;
899 if (handle
== NULL
|| ev
== NULL
) {
900 ret
= -LTTNG_ERR_INVALID
;
904 /* Empty filter string will always be rejected by the parser
905 * anyway, so treat this corner-case early to eliminate
906 * lttng_fmemopen error for 0-byte allocation.
908 if (filter_expression
&& filter_expression
[0] == '\0') {
909 ret
= -LTTNG_ERR_INVALID
;
913 memset(&lsm
, 0, sizeof(lsm
));
915 /* If no channel name, send empty string. */
916 if (channel_name
== NULL
) {
917 lttng_ctl_copy_string(lsm
.u
.enable
.channel_name
, "",
918 sizeof(lsm
.u
.enable
.channel_name
));
920 lttng_ctl_copy_string(lsm
.u
.enable
.channel_name
, channel_name
,
921 sizeof(lsm
.u
.enable
.channel_name
));
924 lsm
.cmd_type
= LTTNG_ENABLE_EVENT
;
925 if (ev
->name
[0] == '\0') {
926 /* Enable all events */
927 lttng_ctl_copy_string(ev
->name
, "*", sizeof(ev
->name
));
930 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
931 /* FIXME: copying non-packed struct to packed struct. */
932 memcpy(&lsm
.u
.enable
.event
, ev
, sizeof(lsm
.u
.enable
.event
));
934 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
935 sizeof(lsm
.session
.name
));
936 lsm
.u
.enable
.exclusion_count
= exclusion_count
;
937 lsm
.u
.enable
.bytecode_len
= 0;
940 * For the JUL domain, a filter is enforced except for the enable all
941 * event. This is done to avoid having the event in all sessions thus
942 * filtering by logger name.
944 if (exclusion_count
== 0 && filter_expression
== NULL
&&
945 (handle
->domain
.type
!= LTTNG_DOMAIN_JUL
&&
946 handle
->domain
.type
!= LTTNG_DOMAIN_LOG4J
&&
947 handle
->domain
.type
!= LTTNG_DOMAIN_PYTHON
)) {
952 * We have either a filter or some exclusions, so we need to set up
953 * a variable-length memory block from where to send the data
956 /* Parse filter expression */
957 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
958 || handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
959 || handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
960 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
||
961 handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
||
962 handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
965 /* Setup JUL filter if needed. */
966 agent_filter
= set_agent_filter(filter_expression
, ev
);
968 if (!filter_expression
) {
969 /* No JUL and no filter, just skip everything below. */
974 * With an agent filter, the original filter has been added to
975 * it thus replace the filter expression.
977 filter_expression
= agent_filter
;
978 free_filter_expression
= 1;
982 ret
= generate_filter(filter_expression
, &lsm
, &ctx
);
988 varlen_data
= zmalloc(lsm
.u
.enable
.bytecode_len
989 + lsm
.u
.enable
.expression_len
990 + LTTNG_SYMBOL_NAME_LEN
* exclusion_count
);
992 ret
= -LTTNG_ERR_EXCLUSION_NOMEM
;
996 /* Put exclusion names first in the data */
997 while (exclusion_count
--) {
998 strncpy(varlen_data
+ LTTNG_SYMBOL_NAME_LEN
* exclusion_count
,
999 *(exclusion_list
+ exclusion_count
), LTTNG_SYMBOL_NAME_LEN
);
1001 /* Add filter expression next */
1002 if (lsm
.u
.enable
.expression_len
!= 0) {
1004 + LTTNG_SYMBOL_NAME_LEN
* lsm
.u
.enable
.exclusion_count
,
1006 lsm
.u
.enable
.expression_len
);
1008 /* Add filter bytecode next */
1009 if (ctx
&& lsm
.u
.enable
.bytecode_len
!= 0) {
1011 + LTTNG_SYMBOL_NAME_LEN
* lsm
.u
.enable
.exclusion_count
1012 + lsm
.u
.enable
.expression_len
,
1014 lsm
.u
.enable
.bytecode_len
);
1017 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, varlen_data
,
1018 (LTTNG_SYMBOL_NAME_LEN
* lsm
.u
.enable
.exclusion_count
) +
1019 lsm
.u
.enable
.bytecode_len
+ lsm
.u
.enable
.expression_len
, NULL
);
1023 if (filter_expression
&& ctx
) {
1024 filter_bytecode_free(ctx
);
1025 filter_ir_free(ctx
);
1026 filter_parser_ctx_free(ctx
);
1029 if (free_filter_expression
) {
1031 * The filter expression has been replaced and must be freed as it is
1032 * not the original filter expression received as a parameter.
1034 free(filter_expression
);
1038 * Return directly to the caller and don't ask the sessiond since something
1039 * went wrong in the parsing of data above.
1044 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1048 int lttng_disable_event_ext(struct lttng_handle
*handle
,
1049 struct lttng_event
*ev
, const char *channel_name
,
1050 const char *original_filter_expression
)
1052 struct lttcomm_session_msg lsm
;
1055 unsigned int free_filter_expression
= 0;
1056 struct filter_parser_ctx
*ctx
= NULL
;
1058 * Cast as non-const since we may replace the filter expression
1059 * by a dynamically allocated string. Otherwise, the original
1060 * string is not modified.
1062 char *filter_expression
= (char *) original_filter_expression
;
1064 if (handle
== NULL
|| ev
== NULL
) {
1065 ret
= -LTTNG_ERR_INVALID
;
1069 /* Empty filter string will always be rejected by the parser
1070 * anyway, so treat this corner-case early to eliminate
1071 * lttng_fmemopen error for 0-byte allocation.
1073 if (filter_expression
&& filter_expression
[0] == '\0') {
1074 ret
= -LTTNG_ERR_INVALID
;
1078 memset(&lsm
, 0, sizeof(lsm
));
1080 /* If no channel name, send empty string. */
1081 if (channel_name
== NULL
) {
1082 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, "",
1083 sizeof(lsm
.u
.disable
.channel_name
));
1085 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, channel_name
,
1086 sizeof(lsm
.u
.disable
.channel_name
));
1089 lsm
.cmd_type
= LTTNG_DISABLE_EVENT
;
1090 if (ev
->name
[0] == '\0') {
1091 /* Disable all events */
1092 lttng_ctl_copy_string(ev
->name
, "*", sizeof(ev
->name
));
1095 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1096 /* FIXME: copying non-packed struct to packed struct. */
1097 memcpy(&lsm
.u
.disable
.event
, ev
, sizeof(lsm
.u
.disable
.event
));
1099 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1100 sizeof(lsm
.session
.name
));
1101 lsm
.u
.disable
.bytecode_len
= 0;
1104 * For the JUL domain, a filter is enforced except for the
1105 * disable all event. This is done to avoid having the event in
1106 * all sessions thus filtering by logger name.
1108 if (filter_expression
== NULL
&&
1109 (handle
->domain
.type
!= LTTNG_DOMAIN_JUL
&&
1110 handle
->domain
.type
!= LTTNG_DOMAIN_LOG4J
&&
1111 handle
->domain
.type
!= LTTNG_DOMAIN_PYTHON
)) {
1116 * We have a filter, so we need to set up a variable-length
1117 * memory block from where to send the data.
1120 /* Parse filter expression */
1121 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
1122 || handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
1123 || handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1124 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
||
1125 handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
||
1126 handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1129 /* Setup JUL filter if needed. */
1130 agent_filter
= set_agent_filter(filter_expression
, ev
);
1131 if (!agent_filter
) {
1132 if (!filter_expression
) {
1133 /* No JUL and no filter, just skip everything below. */
1138 * With a JUL filter, the original filter has been added to it
1139 * thus replace the filter expression.
1141 filter_expression
= agent_filter
;
1142 free_filter_expression
= 1;
1146 ret
= generate_filter(filter_expression
, &lsm
, &ctx
);
1152 varlen_data
= zmalloc(lsm
.u
.disable
.bytecode_len
1153 + lsm
.u
.disable
.expression_len
);
1155 ret
= -LTTNG_ERR_EXCLUSION_NOMEM
;
1159 /* Add filter expression */
1160 if (lsm
.u
.disable
.expression_len
!= 0) {
1163 lsm
.u
.disable
.expression_len
);
1165 /* Add filter bytecode next */
1166 if (ctx
&& lsm
.u
.disable
.bytecode_len
!= 0) {
1168 + lsm
.u
.disable
.expression_len
,
1170 lsm
.u
.disable
.bytecode_len
);
1173 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, varlen_data
,
1174 lsm
.u
.disable
.bytecode_len
+ lsm
.u
.disable
.expression_len
, NULL
);
1178 if (filter_expression
&& ctx
) {
1179 filter_bytecode_free(ctx
);
1180 filter_ir_free(ctx
);
1181 filter_parser_ctx_free(ctx
);
1184 if (free_filter_expression
) {
1186 * The filter expression has been replaced and must be freed as it is
1187 * not the original filter expression received as a parameter.
1189 free(filter_expression
);
1193 * Return directly to the caller and don't ask the sessiond since something
1194 * went wrong in the parsing of data above.
1199 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1204 * Disable event(s) of a channel and domain.
1205 * If no event name is specified, all events are disabled.
1206 * If no channel name is specified, the default 'channel0' is used.
1207 * Returns size of returned session payload data or a negative error code.
1209 int lttng_disable_event(struct lttng_handle
*handle
, const char *name
,
1210 const char *channel_name
)
1212 struct lttng_event ev
;
1214 memset(&ev
, 0, sizeof(ev
));
1215 ev
.type
= LTTNG_EVENT_ALL
;
1216 lttng_ctl_copy_string(ev
.name
, name
, sizeof(ev
.name
));
1217 return lttng_disable_event_ext(handle
, &ev
, channel_name
, NULL
);
1221 * Enable channel per domain
1222 * Returns size of returned session payload data or a negative error code.
1224 int lttng_enable_channel(struct lttng_handle
*handle
,
1225 struct lttng_channel
*chan
)
1227 struct lttcomm_session_msg lsm
;
1230 * NULL arguments are forbidden. No default values.
1232 if (handle
== NULL
|| chan
== NULL
) {
1233 return -LTTNG_ERR_INVALID
;
1236 memset(&lsm
, 0, sizeof(lsm
));
1238 memcpy(&lsm
.u
.channel
.chan
, chan
, sizeof(lsm
.u
.channel
.chan
));
1240 lsm
.cmd_type
= LTTNG_ENABLE_CHANNEL
;
1242 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1244 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1245 sizeof(lsm
.session
.name
));
1247 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1251 * All tracing will be stopped for registered events of the channel.
1252 * Returns size of returned session payload data or a negative error code.
1254 int lttng_disable_channel(struct lttng_handle
*handle
, const char *name
)
1256 struct lttcomm_session_msg lsm
;
1258 /* Safety check. Both are mandatory */
1259 if (handle
== NULL
|| name
== NULL
) {
1260 return -LTTNG_ERR_INVALID
;
1263 memset(&lsm
, 0, sizeof(lsm
));
1265 lsm
.cmd_type
= LTTNG_DISABLE_CHANNEL
;
1267 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, name
,
1268 sizeof(lsm
.u
.disable
.channel_name
));
1270 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1272 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1273 sizeof(lsm
.session
.name
));
1275 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1279 * Lists all available tracepoints of domain.
1280 * Sets the contents of the events array.
1281 * Returns the number of lttng_event entries in events;
1282 * on error, returns a negative value.
1284 int lttng_list_tracepoints(struct lttng_handle
*handle
,
1285 struct lttng_event
**events
)
1288 struct lttcomm_session_msg lsm
;
1290 if (handle
== NULL
) {
1291 return -LTTNG_ERR_INVALID
;
1294 memset(&lsm
, 0, sizeof(lsm
));
1295 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINTS
;
1296 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1298 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) events
);
1303 return ret
/ sizeof(struct lttng_event
);
1307 * Lists all available tracepoint fields of domain.
1308 * Sets the contents of the event field array.
1309 * Returns the number of lttng_event_field entries in events;
1310 * on error, returns a negative value.
1312 int lttng_list_tracepoint_fields(struct lttng_handle
*handle
,
1313 struct lttng_event_field
**fields
)
1316 struct lttcomm_session_msg lsm
;
1318 if (handle
== NULL
) {
1319 return -LTTNG_ERR_INVALID
;
1322 memset(&lsm
, 0, sizeof(lsm
));
1323 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINT_FIELDS
;
1324 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1326 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) fields
);
1331 return ret
/ sizeof(struct lttng_event_field
);
1335 * Lists all available kernel system calls. Allocates and sets the contents of
1338 * Returns the number of lttng_event entries in events; on error, returns a
1341 int lttng_list_syscalls(struct lttng_event
**events
)
1344 struct lttcomm_session_msg lsm
;
1347 return -LTTNG_ERR_INVALID
;
1350 memset(&lsm
, 0, sizeof(lsm
));
1351 lsm
.cmd_type
= LTTNG_LIST_SYSCALLS
;
1352 /* Force kernel domain for system calls. */
1353 lsm
.domain
.type
= LTTNG_DOMAIN_KERNEL
;
1355 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) events
);
1360 return ret
/ sizeof(struct lttng_event
);
1364 * Returns a human readable string describing
1365 * the error code (a negative value).
1367 const char *lttng_strerror(int code
)
1369 return error_get_str(code
);
1373 * Create a brand new session using name and url for destination.
1375 * Returns LTTNG_OK on success or a negative error code.
1377 int lttng_create_session(const char *name
, const char *url
)
1381 struct lttcomm_session_msg lsm
;
1382 struct lttng_uri
*uris
= NULL
;
1385 return -LTTNG_ERR_INVALID
;
1388 memset(&lsm
, 0, sizeof(lsm
));
1390 lsm
.cmd_type
= LTTNG_CREATE_SESSION
;
1391 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1393 /* There should never be a data URL */
1394 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1396 return -LTTNG_ERR_INVALID
;
1399 lsm
.u
.uri
.size
= size
;
1401 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1402 sizeof(struct lttng_uri
) * size
, NULL
);
1409 * Destroy session using name.
1410 * Returns size of returned session payload data or a negative error code.
1412 int lttng_destroy_session(const char *session_name
)
1414 struct lttcomm_session_msg lsm
;
1416 if (session_name
== NULL
) {
1417 return -LTTNG_ERR_INVALID
;
1420 memset(&lsm
, 0, sizeof(lsm
));
1421 lsm
.cmd_type
= LTTNG_DESTROY_SESSION
;
1423 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1424 sizeof(lsm
.session
.name
));
1426 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1430 * Ask the session daemon for all available sessions.
1431 * Sets the contents of the sessions array.
1432 * Returns the number of lttng_session entries in sessions;
1433 * on error, returns a negative value.
1435 int lttng_list_sessions(struct lttng_session
**sessions
)
1438 struct lttcomm_session_msg lsm
;
1440 memset(&lsm
, 0, sizeof(lsm
));
1441 lsm
.cmd_type
= LTTNG_LIST_SESSIONS
;
1442 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) sessions
);
1447 return ret
/ sizeof(struct lttng_session
);
1451 * Ask the session daemon for all available domains of a session.
1452 * Sets the contents of the domains array.
1453 * Returns the number of lttng_domain entries in domains;
1454 * on error, returns a negative value.
1456 int lttng_list_domains(const char *session_name
,
1457 struct lttng_domain
**domains
)
1460 struct lttcomm_session_msg lsm
;
1462 if (session_name
== NULL
) {
1463 return -LTTNG_ERR_INVALID
;
1466 memset(&lsm
, 0, sizeof(lsm
));
1467 lsm
.cmd_type
= LTTNG_LIST_DOMAINS
;
1469 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1470 sizeof(lsm
.session
.name
));
1472 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) domains
);
1477 return ret
/ sizeof(struct lttng_domain
);
1481 * Ask the session daemon for all available channels of a session.
1482 * Sets the contents of the channels array.
1483 * Returns the number of lttng_channel entries in channels;
1484 * on error, returns a negative value.
1486 int lttng_list_channels(struct lttng_handle
*handle
,
1487 struct lttng_channel
**channels
)
1490 struct lttcomm_session_msg lsm
;
1492 if (handle
== NULL
) {
1493 return -LTTNG_ERR_INVALID
;
1496 memset(&lsm
, 0, sizeof(lsm
));
1497 lsm
.cmd_type
= LTTNG_LIST_CHANNELS
;
1498 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1499 sizeof(lsm
.session
.name
));
1501 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1503 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) channels
);
1508 return ret
/ sizeof(struct lttng_channel
);
1512 * Ask the session daemon for all available events of a session channel.
1513 * Sets the contents of the events array.
1514 * Returns the number of lttng_event entries in events;
1515 * on error, returns a negative value.
1517 int lttng_list_events(struct lttng_handle
*handle
,
1518 const char *channel_name
, struct lttng_event
**events
)
1521 struct lttcomm_session_msg lsm
;
1523 /* Safety check. An handle and channel name are mandatory */
1524 if (handle
== NULL
|| channel_name
== NULL
) {
1525 return -LTTNG_ERR_INVALID
;
1528 memset(&lsm
, 0, sizeof(lsm
));
1529 lsm
.cmd_type
= LTTNG_LIST_EVENTS
;
1530 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1531 sizeof(lsm
.session
.name
));
1532 lttng_ctl_copy_string(lsm
.u
.list
.channel_name
, channel_name
,
1533 sizeof(lsm
.u
.list
.channel_name
));
1535 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1537 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) events
);
1542 return ret
/ sizeof(struct lttng_event
);
1546 * Sets the tracing_group variable with name.
1547 * This function allocates memory pointed to by tracing_group.
1548 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
1550 int lttng_set_tracing_group(const char *name
)
1553 return -LTTNG_ERR_INVALID
;
1556 if (asprintf(&tracing_group
, "%s", name
) < 0) {
1557 return -LTTNG_ERR_FATAL
;
1564 * Returns size of returned session payload data or a negative error code.
1566 int lttng_calibrate(struct lttng_handle
*handle
,
1567 struct lttng_calibrate
*calibrate
)
1569 struct lttcomm_session_msg lsm
;
1571 /* Safety check. NULL pointer are forbidden */
1572 if (handle
== NULL
|| calibrate
== NULL
) {
1573 return -LTTNG_ERR_INVALID
;
1576 memset(&lsm
, 0, sizeof(lsm
));
1577 lsm
.cmd_type
= LTTNG_CALIBRATE
;
1578 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1580 memcpy(&lsm
.u
.calibrate
, calibrate
, sizeof(lsm
.u
.calibrate
));
1582 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1586 * Set default channel attributes.
1587 * If either or both of the arguments are null, attr content is zeroe'd.
1589 void lttng_channel_set_default_attr(struct lttng_domain
*domain
,
1590 struct lttng_channel_attr
*attr
)
1593 if (attr
== NULL
|| domain
== NULL
) {
1597 memset(attr
, 0, sizeof(struct lttng_channel_attr
));
1599 /* Same for all domains. */
1600 attr
->overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
1601 attr
->tracefile_size
= DEFAULT_CHANNEL_TRACEFILE_SIZE
;
1602 attr
->tracefile_count
= DEFAULT_CHANNEL_TRACEFILE_COUNT
;
1604 switch (domain
->type
) {
1605 case LTTNG_DOMAIN_KERNEL
:
1606 attr
->switch_timer_interval
= DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER
;
1607 attr
->read_timer_interval
= DEFAULT_KERNEL_CHANNEL_READ_TIMER
;
1608 attr
->subbuf_size
= default_get_kernel_channel_subbuf_size();
1609 attr
->num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
1610 attr
->output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
1612 case LTTNG_DOMAIN_UST
:
1613 switch (domain
->buf_type
) {
1614 case LTTNG_BUFFER_PER_UID
:
1615 attr
->subbuf_size
= default_get_ust_uid_channel_subbuf_size();
1616 attr
->num_subbuf
= DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM
;
1617 attr
->output
= DEFAULT_UST_UID_CHANNEL_OUTPUT
;
1618 attr
->switch_timer_interval
= DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER
;
1619 attr
->read_timer_interval
= DEFAULT_UST_UID_CHANNEL_READ_TIMER
;
1621 case LTTNG_BUFFER_PER_PID
:
1623 attr
->subbuf_size
= default_get_ust_pid_channel_subbuf_size();
1624 attr
->num_subbuf
= DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM
;
1625 attr
->output
= DEFAULT_UST_PID_CHANNEL_OUTPUT
;
1626 attr
->switch_timer_interval
= DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER
;
1627 attr
->read_timer_interval
= DEFAULT_UST_PID_CHANNEL_READ_TIMER
;
1631 /* Default behavior: leave set to 0. */
1637 * Check if session daemon is alive.
1639 * Return 1 if alive or 0 if not.
1640 * On error returns a negative value.
1642 int lttng_session_daemon_alive(void)
1646 ret
= set_session_daemon_path();
1652 if (*sessiond_sock_path
== '\0') {
1654 * No socket path set. Weird error which means the constructor was not
1660 ret
= try_connect_sessiond(sessiond_sock_path
);
1671 * Set URL for a consumer for a session and domain.
1673 * Return 0 on success, else a negative value.
1675 int lttng_set_consumer_url(struct lttng_handle
*handle
,
1676 const char *control_url
, const char *data_url
)
1680 struct lttcomm_session_msg lsm
;
1681 struct lttng_uri
*uris
= NULL
;
1683 if (handle
== NULL
|| (control_url
== NULL
&& data_url
== NULL
)) {
1684 return -LTTNG_ERR_INVALID
;
1687 memset(&lsm
, 0, sizeof(lsm
));
1689 lsm
.cmd_type
= LTTNG_SET_CONSUMER_URI
;
1691 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1692 sizeof(lsm
.session
.name
));
1693 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1695 size
= uri_parse_str_urls(control_url
, data_url
, &uris
);
1697 return -LTTNG_ERR_INVALID
;
1700 lsm
.u
.uri
.size
= size
;
1702 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1703 sizeof(struct lttng_uri
) * size
, NULL
);
1712 int lttng_enable_consumer(struct lttng_handle
*handle
)
1720 int lttng_disable_consumer(struct lttng_handle
*handle
)
1726 * This is an extension of create session that is ONLY and SHOULD only be used
1727 * by the lttng command line program. It exists to avoid using URI parsing in
1730 * We need the date and time for the trace path subdirectory for the case where
1731 * the user does NOT define one using either -o or -U. Using the normal
1732 * lttng_create_session API call, we have no clue on the session daemon side if
1733 * the URL was generated automatically by the client or define by the user.
1735 * So this function "wrapper" is hidden from the public API, takes the datetime
1736 * string and appends it if necessary to the URI subdirectory before sending it
1737 * to the session daemon.
1739 * With this extra function, the lttng_create_session call behavior is not
1740 * changed and the timestamp is appended to the URI on the session daemon side
1743 int _lttng_create_session_ext(const char *name
, const char *url
,
1744 const char *datetime
)
1748 struct lttcomm_session_msg lsm
;
1749 struct lttng_uri
*uris
= NULL
;
1751 if (name
== NULL
|| datetime
== NULL
) {
1752 return -LTTNG_ERR_INVALID
;
1755 memset(&lsm
, 0, sizeof(lsm
));
1757 lsm
.cmd_type
= LTTNG_CREATE_SESSION
;
1758 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1760 /* There should never be a data URL */
1761 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1763 ret
= -LTTNG_ERR_INVALID
;
1767 lsm
.u
.uri
.size
= size
;
1769 if (size
> 0 && uris
[0].dtype
!= LTTNG_DST_PATH
&& strlen(uris
[0].subdir
) == 0) {
1770 /* Don't append datetime if the name was automatically created. */
1771 if (strncmp(name
, DEFAULT_SESSION_NAME
"-",
1772 strlen(DEFAULT_SESSION_NAME
) + 1)) {
1773 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s-%s",
1776 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s", name
);
1779 PERROR("snprintf uri subdir");
1780 ret
= -LTTNG_ERR_FATAL
;
1785 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1786 sizeof(struct lttng_uri
) * size
, NULL
);
1794 * For a given session name, this call checks if the data is ready to be read
1795 * or is still being extracted by the consumer(s) hence not ready to be used by
1798 int lttng_data_pending(const char *session_name
)
1801 struct lttcomm_session_msg lsm
;
1803 if (session_name
== NULL
) {
1804 return -LTTNG_ERR_INVALID
;
1807 memset(&lsm
, 0, sizeof(lsm
));
1808 lsm
.cmd_type
= LTTNG_DATA_PENDING
;
1810 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1811 sizeof(lsm
.session
.name
));
1813 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1816 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1817 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1818 * that the data is available. Yes it is hackish but for now this is the
1829 * Create a session exclusively used for snapshot.
1831 * Returns LTTNG_OK on success or a negative error code.
1833 int lttng_create_session_snapshot(const char *name
, const char *snapshot_url
)
1837 struct lttcomm_session_msg lsm
;
1838 struct lttng_uri
*uris
= NULL
;
1841 return -LTTNG_ERR_INVALID
;
1844 memset(&lsm
, 0, sizeof(lsm
));
1846 lsm
.cmd_type
= LTTNG_CREATE_SESSION_SNAPSHOT
;
1847 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1849 size
= uri_parse_str_urls(snapshot_url
, NULL
, &uris
);
1851 return -LTTNG_ERR_INVALID
;
1854 lsm
.u
.uri
.size
= size
;
1856 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1857 sizeof(struct lttng_uri
) * size
, NULL
);
1864 * Create a session exclusively used for live.
1866 * Returns LTTNG_OK on success or a negative error code.
1868 int lttng_create_session_live(const char *name
, const char *url
,
1869 unsigned int timer_interval
)
1873 struct lttcomm_session_msg lsm
;
1874 struct lttng_uri
*uris
= NULL
;
1877 return -LTTNG_ERR_INVALID
;
1880 memset(&lsm
, 0, sizeof(lsm
));
1882 lsm
.cmd_type
= LTTNG_CREATE_SESSION_LIVE
;
1883 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1886 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1888 ret
= -LTTNG_ERR_INVALID
;
1892 /* file:// is not accepted for live session. */
1893 if (uris
[0].dtype
== LTTNG_DST_PATH
) {
1894 ret
= -LTTNG_ERR_INVALID
;
1901 lsm
.u
.session_live
.nb_uri
= size
;
1902 lsm
.u
.session_live
.timer_interval
= timer_interval
;
1904 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1905 sizeof(struct lttng_uri
) * size
, NULL
);
1915 static void __attribute__((constructor
)) init()
1917 /* Set default session group */
1918 lttng_set_tracing_group(DEFAULT_TRACING_GROUP
);
1924 static void __attribute__((destructor
)) lttng_ctl_exit()
1926 free(tracing_group
);