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 case LTTNG_DOMAIN_PYTHON
:
110 memcpy(dst
, src
, sizeof(struct lttng_domain
));
113 memset(dst
, 0, sizeof(struct lttng_domain
));
120 * Send lttcomm_session_msg to the session daemon.
122 * On success, returns the number of bytes sent (>=0)
123 * On error, returns -1
125 static int send_session_msg(struct lttcomm_session_msg
*lsm
)
130 ret
= -LTTNG_ERR_NO_SESSIOND
;
134 DBG("LSM cmd type : %d", lsm
->cmd_type
);
136 ret
= lttcomm_send_creds_unix_sock(sessiond_socket
, lsm
,
137 sizeof(struct lttcomm_session_msg
));
139 ret
= -LTTNG_ERR_FATAL
;
147 * Send var len data to the session daemon.
149 * On success, returns the number of bytes sent (>=0)
150 * On error, returns -1
152 static int send_session_varlen(void *data
, size_t len
)
157 ret
= -LTTNG_ERR_NO_SESSIOND
;
166 ret
= lttcomm_send_unix_sock(sessiond_socket
, data
, len
);
168 ret
= -LTTNG_ERR_FATAL
;
176 * Receive data from the sessiond socket.
178 * On success, returns the number of bytes received (>=0)
179 * On error, returns -1 (recvmsg() error) or -ENOTCONN
181 static int recv_data_sessiond(void *buf
, size_t len
)
186 ret
= -LTTNG_ERR_NO_SESSIOND
;
190 ret
= lttcomm_recv_unix_sock(sessiond_socket
, buf
, len
);
192 ret
= -LTTNG_ERR_FATAL
;
200 * Check if we are in the specified group.
202 * If yes return 1, else return -1.
205 int lttng_check_tracing_group(void)
207 struct group
*grp_tracing
; /* no free(). See getgrnam(3) */
209 int grp_list_size
, grp_id
, i
;
211 const char *grp_name
= tracing_group
;
213 /* Get GID of group 'tracing' */
214 grp_tracing
= getgrnam(grp_name
);
216 /* If grp_tracing is NULL, the group does not exist. */
220 /* Get number of supplementary group IDs */
221 grp_list_size
= getgroups(0, NULL
);
222 if (grp_list_size
< 0) {
227 /* Alloc group list of the right size */
228 grp_list
= malloc(grp_list_size
* sizeof(gid_t
));
233 grp_id
= getgroups(grp_list_size
, grp_list
);
239 for (i
= 0; i
< grp_list_size
; i
++) {
240 if (grp_list
[i
] == grp_tracing
->gr_gid
) {
254 * Try connect to session daemon with sock_path.
256 * Return 0 on success, else -1
258 static int try_connect_sessiond(const char *sock_path
)
262 /* If socket exist, we check if the daemon listens for connect. */
263 ret
= access(sock_path
, F_OK
);
269 ret
= lttcomm_connect_unix_sock(sock_path
);
275 ret
= lttcomm_close_unix_sock(ret
);
277 perror("lttcomm_close_unix_sock");
287 * Set sessiond socket path by putting it in the global sessiond_sock_path
290 * Returns 0 on success, negative value on failure (the sessiond socket path
291 * is somehow too long or ENOMEM).
293 static int set_session_daemon_path(void)
295 int in_tgroup
= 0; /* In tracing group */
301 /* Are we in the tracing group ? */
302 in_tgroup
= lttng_check_tracing_group();
305 if ((uid
== 0) || in_tgroup
) {
306 lttng_ctl_copy_string(sessiond_sock_path
,
307 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
, sizeof(sessiond_sock_path
));
315 ret
= try_connect_sessiond(sessiond_sock_path
);
319 /* Global session daemon not available... */
321 /* ...or not in tracing group (and not root), default */
324 * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
325 * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
327 ret
= snprintf(sessiond_sock_path
, sizeof(sessiond_sock_path
),
328 DEFAULT_HOME_CLIENT_UNIX_SOCK
, utils_get_home_dir());
329 if ((ret
< 0) || (ret
>= sizeof(sessiond_sock_path
))) {
341 * Connect to the LTTng session daemon.
343 * On success, return 0. On error, return -1.
345 static int connect_sessiond(void)
349 /* Don't try to connect if already connected. */
354 ret
= set_session_daemon_path();
359 /* Connect to the sesssion daemon */
360 ret
= lttcomm_connect_unix_sock(sessiond_sock_path
);
365 sessiond_socket
= ret
;
375 * Clean disconnect from the session daemon.
376 * On success, return 0. On error, return -1.
378 static int disconnect_sessiond(void)
383 ret
= lttcomm_close_unix_sock(sessiond_socket
);
392 * Ask the session daemon a specific command and put the data into buf.
393 * Takes extra var. len. data as input to send to the session daemon.
395 * Return size of data (only payload, not header) or a negative error code.
398 int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg
*lsm
,
399 void *vardata
, size_t varlen
, void **buf
)
404 struct lttcomm_lttng_msg llm
;
406 ret
= connect_sessiond();
408 ret
= -LTTNG_ERR_NO_SESSIOND
;
412 /* Send command to session daemon */
413 ret
= send_session_msg(lsm
);
415 /* Ret value is a valid lttng error code. */
418 /* Send var len data */
419 ret
= send_session_varlen(vardata
, varlen
);
421 /* Ret value is a valid lttng error code. */
425 /* Get header from data transmission */
426 ret
= recv_data_sessiond(&llm
, sizeof(llm
));
428 /* Ret value is a valid lttng error code. */
432 /* Check error code if OK */
433 if (llm
.ret_code
!= LTTNG_OK
) {
438 size
= llm
.data_size
;
440 /* If client free with size 0 */
448 data
= (void*) malloc(size
);
450 /* Get payload data */
451 ret
= recv_data_sessiond(data
, size
);
458 * Extra protection not to dereference a NULL pointer. If buf is NULL at
459 * this point, an error is returned and data is freed.
462 ret
= -LTTNG_ERR_INVALID
;
471 disconnect_sessiond();
476 * Create lttng handle and return pointer.
477 * The returned pointer will be NULL in case of malloc() error.
479 struct lttng_handle
*lttng_create_handle(const char *session_name
,
480 struct lttng_domain
*domain
)
482 struct lttng_handle
*handle
= NULL
;
484 if (domain
== NULL
) {
488 handle
= malloc(sizeof(struct lttng_handle
));
489 if (handle
== NULL
) {
490 PERROR("malloc handle");
494 /* Copy session name */
495 lttng_ctl_copy_string(handle
->session_name
, session_name
,
496 sizeof(handle
->session_name
));
498 /* Copy lttng domain */
499 lttng_ctl_copy_lttng_domain(&handle
->domain
, domain
);
506 * Destroy handle by free(3) the pointer.
508 void lttng_destroy_handle(struct lttng_handle
*handle
)
514 * Register an outside consumer.
515 * Returns size of returned session payload data or a negative error code.
517 int lttng_register_consumer(struct lttng_handle
*handle
,
518 const char *socket_path
)
520 struct lttcomm_session_msg lsm
;
522 if (handle
== NULL
|| socket_path
== NULL
) {
523 return -LTTNG_ERR_INVALID
;
526 memset(&lsm
, 0, sizeof(lsm
));
527 lsm
.cmd_type
= LTTNG_REGISTER_CONSUMER
;
528 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
529 sizeof(lsm
.session
.name
));
530 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
532 lttng_ctl_copy_string(lsm
.u
.reg
.path
, socket_path
, sizeof(lsm
.u
.reg
.path
));
534 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
538 * Start tracing for all traces of the session.
539 * Returns size of returned session payload data or a negative error code.
541 int lttng_start_tracing(const char *session_name
)
543 struct lttcomm_session_msg lsm
;
545 if (session_name
== NULL
) {
546 return -LTTNG_ERR_INVALID
;
549 memset(&lsm
, 0, sizeof(lsm
));
550 lsm
.cmd_type
= LTTNG_START_TRACE
;
552 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
553 sizeof(lsm
.session
.name
));
555 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
559 * Stop tracing for all traces of the session.
561 static int _lttng_stop_tracing(const char *session_name
, int wait
)
564 struct lttcomm_session_msg lsm
;
566 if (session_name
== NULL
) {
567 return -LTTNG_ERR_INVALID
;
570 memset(&lsm
, 0, sizeof(lsm
));
571 lsm
.cmd_type
= LTTNG_STOP_TRACE
;
573 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
574 sizeof(lsm
.session
.name
));
576 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
577 if (ret
< 0 && ret
!= -LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
585 /* Check for data availability */
587 data_ret
= lttng_data_pending(session_name
);
589 /* Return the data available call error. */
595 * Data sleep time before retrying (in usec). Don't sleep if the call
596 * returned value indicates availability.
599 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME
);
601 } while (data_ret
!= 0);
609 * Stop tracing and wait for data availability.
611 int lttng_stop_tracing(const char *session_name
)
613 return _lttng_stop_tracing(session_name
, 1);
617 * Stop tracing but _don't_ wait for data availability.
619 int lttng_stop_tracing_no_wait(const char *session_name
)
621 return _lttng_stop_tracing(session_name
, 0);
625 * Add context to a channel.
627 * If the given channel is NULL, add the contexts to all channels.
628 * The event_name param is ignored.
630 * Returns the size of the returned payload data or a negative error code.
632 int lttng_add_context(struct lttng_handle
*handle
,
633 struct lttng_event_context
*ctx
, const char *event_name
,
634 const char *channel_name
)
636 struct lttcomm_session_msg lsm
;
638 /* Safety check. Both are mandatory */
639 if (handle
== NULL
|| ctx
== NULL
) {
640 return -LTTNG_ERR_INVALID
;
643 memset(&lsm
, 0, sizeof(lsm
));
645 lsm
.cmd_type
= LTTNG_ADD_CONTEXT
;
647 /* If no channel name, send empty string. */
648 if (channel_name
== NULL
) {
649 lttng_ctl_copy_string(lsm
.u
.context
.channel_name
, "",
650 sizeof(lsm
.u
.context
.channel_name
));
652 lttng_ctl_copy_string(lsm
.u
.context
.channel_name
, channel_name
,
653 sizeof(lsm
.u
.context
.channel_name
));
656 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
658 memcpy(&lsm
.u
.context
.ctx
, ctx
, sizeof(struct lttng_event_context
));
660 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
661 sizeof(lsm
.session
.name
));
663 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
667 * Enable event(s) for a channel.
668 * If no event name is specified, all events are enabled.
669 * If no channel name is specified, the default 'channel0' is used.
670 * Returns size of returned session payload data or a negative error code.
672 int lttng_enable_event(struct lttng_handle
*handle
,
673 struct lttng_event
*ev
, const char *channel_name
)
675 return lttng_enable_event_with_exclusions(handle
, ev
, channel_name
,
680 * Create or enable an event with a filter expression.
682 * Return negative error value on error.
683 * Return size of returned session payload data if OK.
685 int lttng_enable_event_with_filter(struct lttng_handle
*handle
,
686 struct lttng_event
*event
, const char *channel_name
,
687 const char *filter_expression
)
689 return lttng_enable_event_with_exclusions(handle
, event
, channel_name
,
690 filter_expression
, 0, NULL
);
694 * Depending on the event, return a newly allocated agent filter expression or
695 * NULL if not applicable.
697 * An event with NO loglevel and the name is * will return NULL.
699 static char *set_agent_filter(const char *filter
, struct lttng_event
*ev
)
702 char *agent_filter
= NULL
;
706 /* Don't add filter for the '*' event. */
707 if (ev
->name
[0] != '*') {
709 err
= asprintf(&agent_filter
, "(%s) && (logger_name == \"%s\")", filter
,
712 err
= asprintf(&agent_filter
, "logger_name == \"%s\"", ev
->name
);
720 /* Add loglevel filtering if any for the JUL domain. */
721 if (ev
->loglevel_type
!= LTTNG_EVENT_LOGLEVEL_ALL
) {
724 if (ev
->loglevel_type
== LTTNG_EVENT_LOGLEVEL_RANGE
) {
730 if (filter
|| agent_filter
) {
733 err
= asprintf(&new_filter
, "(%s) && (int_loglevel %s %d)",
734 agent_filter
? agent_filter
: filter
, op
,
739 agent_filter
= new_filter
;
741 err
= asprintf(&agent_filter
, "int_loglevel %s %d", op
,
757 * Generate the filter bytecode from a give filter expression string. Put the
758 * newly allocated parser context in ctxp and populate the lsm object with the
761 * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched.
763 static int generate_filter(char *filter_expression
,
764 struct lttcomm_session_msg
*lsm
, struct filter_parser_ctx
**ctxp
)
767 struct filter_parser_ctx
*ctx
= NULL
;
770 assert(filter_expression
);
775 * Casting const to non-const, as the underlying function will use it in
778 fmem
= lttng_fmemopen((void *) filter_expression
,
779 strlen(filter_expression
), "r");
781 fprintf(stderr
, "Error opening memory as stream\n");
782 ret
= -LTTNG_ERR_FILTER_NOMEM
;
785 ctx
= filter_parser_ctx_alloc(fmem
);
787 fprintf(stderr
, "Error allocating parser\n");
788 ret
= -LTTNG_ERR_FILTER_NOMEM
;
789 goto filter_alloc_error
;
791 ret
= filter_parser_ctx_append_ast(ctx
);
793 fprintf(stderr
, "Parse error\n");
794 ret
= -LTTNG_ERR_FILTER_INVAL
;
797 ret
= filter_visitor_set_parent(ctx
);
799 fprintf(stderr
, "Set parent error\n");
800 ret
= -LTTNG_ERR_FILTER_INVAL
;
804 ret
= filter_visitor_print_xml(ctx
, stdout
, 0);
807 fprintf(stderr
, "XML print error\n");
808 ret
= -LTTNG_ERR_FILTER_INVAL
;
813 dbg_printf("Generating IR... ");
815 ret
= filter_visitor_ir_generate(ctx
);
817 fprintf(stderr
, "Generate IR error\n");
818 ret
= -LTTNG_ERR_FILTER_INVAL
;
821 dbg_printf("done\n");
823 dbg_printf("Validating IR... ");
825 ret
= filter_visitor_ir_check_binary_op_nesting(ctx
);
827 ret
= -LTTNG_ERR_FILTER_INVAL
;
830 /* Validate strings used as literals in the expression */
831 ret
= filter_visitor_ir_validate_string(ctx
);
833 ret
= -LTTNG_ERR_FILTER_INVAL
;
836 dbg_printf("done\n");
838 dbg_printf("Generating bytecode... ");
840 ret
= filter_visitor_bytecode_generate(ctx
);
842 fprintf(stderr
, "Generate bytecode error\n");
843 ret
= -LTTNG_ERR_FILTER_INVAL
;
846 dbg_printf("done\n");
847 dbg_printf("Size of bytecode generated: %u bytes.\n",
848 bytecode_get_len(&ctx
->bytecode
->b
));
850 lsm
->u
.enable
.bytecode_len
= sizeof(ctx
->bytecode
->b
)
851 + bytecode_get_len(&ctx
->bytecode
->b
);
852 lsm
->u
.enable
.expression_len
= strlen(filter_expression
) + 1;
854 /* No need to keep the memory stream. */
855 if (fclose(fmem
) != 0) {
864 filter_parser_ctx_free(ctx
);
866 if (fclose(fmem
) != 0) {
874 * Enable event(s) for a channel, possibly with exclusions and a filter.
875 * If no event name is specified, all events are enabled.
876 * If no channel name is specified, the default name is used.
877 * If filter expression is not NULL, the filter is set for the event.
878 * If exclusion count is not zero, the exclusions are set for the event.
879 * Returns size of returned session payload data or a negative error code.
881 int lttng_enable_event_with_exclusions(struct lttng_handle
*handle
,
882 struct lttng_event
*ev
, const char *channel_name
,
883 const char *original_filter_expression
,
884 int exclusion_count
, char **exclusion_list
)
886 struct lttcomm_session_msg lsm
;
889 unsigned int free_filter_expression
= 0;
890 struct filter_parser_ctx
*ctx
= NULL
;
892 * Cast as non-const since we may replace the filter expression
893 * by a dynamically allocated string. Otherwise, the original
894 * string is not modified.
896 char *filter_expression
= (char *) original_filter_expression
;
898 if (handle
== NULL
|| ev
== NULL
) {
899 ret
= -LTTNG_ERR_INVALID
;
903 /* Empty filter string will always be rejected by the parser
904 * anyway, so treat this corner-case early to eliminate
905 * lttng_fmemopen error for 0-byte allocation.
907 if (filter_expression
&& filter_expression
[0] == '\0') {
908 ret
= -LTTNG_ERR_INVALID
;
912 memset(&lsm
, 0, sizeof(lsm
));
914 /* If no channel name, send empty string. */
915 if (channel_name
== NULL
) {
916 lttng_ctl_copy_string(lsm
.u
.enable
.channel_name
, "",
917 sizeof(lsm
.u
.enable
.channel_name
));
919 lttng_ctl_copy_string(lsm
.u
.enable
.channel_name
, channel_name
,
920 sizeof(lsm
.u
.enable
.channel_name
));
923 lsm
.cmd_type
= LTTNG_ENABLE_EVENT
;
924 if (ev
->name
[0] == '\0') {
925 /* Enable all events */
926 lttng_ctl_copy_string(ev
->name
, "*", sizeof(ev
->name
));
929 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
930 /* FIXME: copying non-packed struct to packed struct. */
931 memcpy(&lsm
.u
.enable
.event
, ev
, sizeof(lsm
.u
.enable
.event
));
933 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
934 sizeof(lsm
.session
.name
));
935 lsm
.u
.enable
.exclusion_count
= exclusion_count
;
936 lsm
.u
.enable
.bytecode_len
= 0;
939 * For the JUL domain, a filter is enforced except for the enable all
940 * event. This is done to avoid having the event in all sessions thus
941 * filtering by logger name.
943 if (exclusion_count
== 0 && filter_expression
== NULL
&&
944 (handle
->domain
.type
!= LTTNG_DOMAIN_JUL
&&
945 handle
->domain
.type
!= LTTNG_DOMAIN_LOG4J
&&
946 handle
->domain
.type
!= LTTNG_DOMAIN_PYTHON
)) {
951 * We have either a filter or some exclusions, so we need to set up
952 * a variable-length memory block from where to send the data
955 /* Parse filter expression */
956 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
957 || handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
958 || handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
959 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
||
960 handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
||
961 handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
964 /* Setup JUL filter if needed. */
965 agent_filter
= set_agent_filter(filter_expression
, ev
);
967 if (!filter_expression
) {
968 /* No JUL and no filter, just skip everything below. */
973 * With an agent filter, the original filter has been added to
974 * it thus replace the filter expression.
976 filter_expression
= agent_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
&&
1110 handle
->domain
.type
!= LTTNG_DOMAIN_PYTHON
)) {
1115 * We have a filter, so we need to set up a variable-length
1116 * memory block from where to send the data.
1119 /* Parse filter expression */
1120 if (filter_expression
!= NULL
|| handle
->domain
.type
== LTTNG_DOMAIN_JUL
1121 || handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
1122 || handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1123 if (handle
->domain
.type
== LTTNG_DOMAIN_JUL
||
1124 handle
->domain
.type
== LTTNG_DOMAIN_LOG4J
||
1125 handle
->domain
.type
== LTTNG_DOMAIN_PYTHON
) {
1128 /* Setup JUL filter if needed. */
1129 agent_filter
= set_agent_filter(filter_expression
, ev
);
1130 if (!agent_filter
) {
1131 if (!filter_expression
) {
1132 /* No JUL and no filter, just skip everything below. */
1137 * With a JUL filter, the original filter has been added to it
1138 * thus replace the filter expression.
1140 filter_expression
= agent_filter
;
1141 free_filter_expression
= 1;
1145 ret
= generate_filter(filter_expression
, &lsm
, &ctx
);
1151 varlen_data
= zmalloc(lsm
.u
.disable
.bytecode_len
1152 + lsm
.u
.disable
.expression_len
);
1154 ret
= -LTTNG_ERR_EXCLUSION_NOMEM
;
1158 /* Add filter expression */
1159 if (lsm
.u
.disable
.expression_len
!= 0) {
1162 lsm
.u
.disable
.expression_len
);
1164 /* Add filter bytecode next */
1165 if (ctx
&& lsm
.u
.disable
.bytecode_len
!= 0) {
1167 + lsm
.u
.disable
.expression_len
,
1169 lsm
.u
.disable
.bytecode_len
);
1172 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, varlen_data
,
1173 lsm
.u
.disable
.bytecode_len
+ lsm
.u
.disable
.expression_len
, NULL
);
1177 if (filter_expression
&& ctx
) {
1178 filter_bytecode_free(ctx
);
1179 filter_ir_free(ctx
);
1180 filter_parser_ctx_free(ctx
);
1183 if (free_filter_expression
) {
1185 * The filter expression has been replaced and must be freed as it is
1186 * not the original filter expression received as a parameter.
1188 free(filter_expression
);
1192 * Return directly to the caller and don't ask the sessiond since something
1193 * went wrong in the parsing of data above.
1198 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1203 * Disable event(s) of a channel and domain.
1204 * If no event name is specified, all events are disabled.
1205 * If no channel name is specified, the default 'channel0' is used.
1206 * Returns size of returned session payload data or a negative error code.
1208 int lttng_disable_event(struct lttng_handle
*handle
, const char *name
,
1209 const char *channel_name
)
1211 struct lttng_event ev
;
1213 memset(&ev
, 0, sizeof(ev
));
1214 ev
.type
= LTTNG_EVENT_ALL
;
1215 lttng_ctl_copy_string(ev
.name
, name
, sizeof(ev
.name
));
1216 return lttng_disable_event_ext(handle
, &ev
, channel_name
, NULL
);
1220 * Enable channel per domain
1221 * Returns size of returned session payload data or a negative error code.
1223 int lttng_enable_channel(struct lttng_handle
*handle
,
1224 struct lttng_channel
*chan
)
1226 struct lttcomm_session_msg lsm
;
1229 * NULL arguments are forbidden. No default values.
1231 if (handle
== NULL
|| chan
== NULL
) {
1232 return -LTTNG_ERR_INVALID
;
1235 memset(&lsm
, 0, sizeof(lsm
));
1237 memcpy(&lsm
.u
.channel
.chan
, chan
, sizeof(lsm
.u
.channel
.chan
));
1239 lsm
.cmd_type
= LTTNG_ENABLE_CHANNEL
;
1241 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1243 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1244 sizeof(lsm
.session
.name
));
1246 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1250 * All tracing will be stopped for registered events of the channel.
1251 * Returns size of returned session payload data or a negative error code.
1253 int lttng_disable_channel(struct lttng_handle
*handle
, const char *name
)
1255 struct lttcomm_session_msg lsm
;
1257 /* Safety check. Both are mandatory */
1258 if (handle
== NULL
|| name
== NULL
) {
1259 return -LTTNG_ERR_INVALID
;
1262 memset(&lsm
, 0, sizeof(lsm
));
1264 lsm
.cmd_type
= LTTNG_DISABLE_CHANNEL
;
1266 lttng_ctl_copy_string(lsm
.u
.disable
.channel_name
, name
,
1267 sizeof(lsm
.u
.disable
.channel_name
));
1269 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1271 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1272 sizeof(lsm
.session
.name
));
1274 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1278 * Lists all available tracepoints of domain.
1279 * Sets the contents of the events array.
1280 * Returns the number of lttng_event entries in events;
1281 * on error, returns a negative value.
1283 int lttng_list_tracepoints(struct lttng_handle
*handle
,
1284 struct lttng_event
**events
)
1287 struct lttcomm_session_msg lsm
;
1289 if (handle
== NULL
) {
1290 return -LTTNG_ERR_INVALID
;
1293 memset(&lsm
, 0, sizeof(lsm
));
1294 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINTS
;
1295 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1297 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) events
);
1302 return ret
/ sizeof(struct lttng_event
);
1306 * Lists all available tracepoint fields of domain.
1307 * Sets the contents of the event field array.
1308 * Returns the number of lttng_event_field entries in events;
1309 * on error, returns a negative value.
1311 int lttng_list_tracepoint_fields(struct lttng_handle
*handle
,
1312 struct lttng_event_field
**fields
)
1315 struct lttcomm_session_msg lsm
;
1317 if (handle
== NULL
) {
1318 return -LTTNG_ERR_INVALID
;
1321 memset(&lsm
, 0, sizeof(lsm
));
1322 lsm
.cmd_type
= LTTNG_LIST_TRACEPOINT_FIELDS
;
1323 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1325 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) fields
);
1330 return ret
/ sizeof(struct lttng_event_field
);
1334 * Lists all available kernel system calls. Allocates and sets the contents of
1337 * Returns the number of lttng_event entries in events; on error, returns a
1340 int lttng_list_syscalls(struct lttng_event
**events
)
1343 struct lttcomm_session_msg lsm
;
1346 return -LTTNG_ERR_INVALID
;
1349 memset(&lsm
, 0, sizeof(lsm
));
1350 lsm
.cmd_type
= LTTNG_LIST_SYSCALLS
;
1351 /* Force kernel domain for system calls. */
1352 lsm
.domain
.type
= LTTNG_DOMAIN_KERNEL
;
1354 ret
= lttng_ctl_ask_sessiond(&lsm
, (void **) events
);
1359 return ret
/ sizeof(struct lttng_event
);
1363 * Returns a human readable string describing
1364 * the error code (a negative value).
1366 const char *lttng_strerror(int code
)
1368 return error_get_str(code
);
1372 * Create a brand new session using name and url for destination.
1374 * Returns LTTNG_OK on success or a negative error code.
1376 int lttng_create_session(const char *name
, const char *url
)
1380 struct lttcomm_session_msg lsm
;
1381 struct lttng_uri
*uris
= NULL
;
1384 return -LTTNG_ERR_INVALID
;
1387 memset(&lsm
, 0, sizeof(lsm
));
1389 lsm
.cmd_type
= LTTNG_CREATE_SESSION
;
1390 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1392 /* There should never be a data URL */
1393 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1395 return -LTTNG_ERR_INVALID
;
1398 lsm
.u
.uri
.size
= size
;
1400 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1401 sizeof(struct lttng_uri
) * size
, NULL
);
1408 * Destroy session using name.
1409 * Returns size of returned session payload data or a negative error code.
1411 int lttng_destroy_session(const char *session_name
)
1413 struct lttcomm_session_msg lsm
;
1415 if (session_name
== NULL
) {
1416 return -LTTNG_ERR_INVALID
;
1419 memset(&lsm
, 0, sizeof(lsm
));
1420 lsm
.cmd_type
= LTTNG_DESTROY_SESSION
;
1422 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1423 sizeof(lsm
.session
.name
));
1425 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1429 * Ask the session daemon for all available sessions.
1430 * Sets the contents of the sessions array.
1431 * Returns the number of lttng_session entries in sessions;
1432 * on error, returns a negative value.
1434 int lttng_list_sessions(struct lttng_session
**sessions
)
1437 struct lttcomm_session_msg lsm
;
1439 memset(&lsm
, 0, sizeof(lsm
));
1440 lsm
.cmd_type
= LTTNG_LIST_SESSIONS
;
1441 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) sessions
);
1446 return ret
/ sizeof(struct lttng_session
);
1450 * Ask the session daemon for all available domains of a session.
1451 * Sets the contents of the domains array.
1452 * Returns the number of lttng_domain entries in domains;
1453 * on error, returns a negative value.
1455 int lttng_list_domains(const char *session_name
,
1456 struct lttng_domain
**domains
)
1459 struct lttcomm_session_msg lsm
;
1461 if (session_name
== NULL
) {
1462 return -LTTNG_ERR_INVALID
;
1465 memset(&lsm
, 0, sizeof(lsm
));
1466 lsm
.cmd_type
= LTTNG_LIST_DOMAINS
;
1468 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1469 sizeof(lsm
.session
.name
));
1471 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) domains
);
1476 return ret
/ sizeof(struct lttng_domain
);
1480 * Ask the session daemon for all available channels of a session.
1481 * Sets the contents of the channels array.
1482 * Returns the number of lttng_channel entries in channels;
1483 * on error, returns a negative value.
1485 int lttng_list_channels(struct lttng_handle
*handle
,
1486 struct lttng_channel
**channels
)
1489 struct lttcomm_session_msg lsm
;
1491 if (handle
== NULL
) {
1492 return -LTTNG_ERR_INVALID
;
1495 memset(&lsm
, 0, sizeof(lsm
));
1496 lsm
.cmd_type
= LTTNG_LIST_CHANNELS
;
1497 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1498 sizeof(lsm
.session
.name
));
1500 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1502 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) channels
);
1507 return ret
/ sizeof(struct lttng_channel
);
1511 * Ask the session daemon for all available events of a session channel.
1512 * Sets the contents of the events array.
1513 * Returns the number of lttng_event entries in events;
1514 * on error, returns a negative value.
1516 int lttng_list_events(struct lttng_handle
*handle
,
1517 const char *channel_name
, struct lttng_event
**events
)
1520 struct lttcomm_session_msg lsm
;
1522 /* Safety check. An handle and channel name are mandatory */
1523 if (handle
== NULL
|| channel_name
== NULL
) {
1524 return -LTTNG_ERR_INVALID
;
1527 memset(&lsm
, 0, sizeof(lsm
));
1528 lsm
.cmd_type
= LTTNG_LIST_EVENTS
;
1529 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1530 sizeof(lsm
.session
.name
));
1531 lttng_ctl_copy_string(lsm
.u
.list
.channel_name
, channel_name
,
1532 sizeof(lsm
.u
.list
.channel_name
));
1534 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1536 ret
= lttng_ctl_ask_sessiond(&lsm
, (void**) events
);
1541 return ret
/ sizeof(struct lttng_event
);
1545 * Sets the tracing_group variable with name.
1546 * This function allocates memory pointed to by tracing_group.
1547 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
1549 int lttng_set_tracing_group(const char *name
)
1552 return -LTTNG_ERR_INVALID
;
1555 if (asprintf(&tracing_group
, "%s", name
) < 0) {
1556 return -LTTNG_ERR_FATAL
;
1563 * Returns size of returned session payload data or a negative error code.
1565 int lttng_calibrate(struct lttng_handle
*handle
,
1566 struct lttng_calibrate
*calibrate
)
1568 struct lttcomm_session_msg lsm
;
1570 /* Safety check. NULL pointer are forbidden */
1571 if (handle
== NULL
|| calibrate
== NULL
) {
1572 return -LTTNG_ERR_INVALID
;
1575 memset(&lsm
, 0, sizeof(lsm
));
1576 lsm
.cmd_type
= LTTNG_CALIBRATE
;
1577 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1579 memcpy(&lsm
.u
.calibrate
, calibrate
, sizeof(lsm
.u
.calibrate
));
1581 return lttng_ctl_ask_sessiond(&lsm
, NULL
);
1585 * Set default channel attributes.
1586 * If either or both of the arguments are null, attr content is zeroe'd.
1588 void lttng_channel_set_default_attr(struct lttng_domain
*domain
,
1589 struct lttng_channel_attr
*attr
)
1592 if (attr
== NULL
|| domain
== NULL
) {
1596 memset(attr
, 0, sizeof(struct lttng_channel_attr
));
1598 /* Same for all domains. */
1599 attr
->overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
1600 attr
->tracefile_size
= DEFAULT_CHANNEL_TRACEFILE_SIZE
;
1601 attr
->tracefile_count
= DEFAULT_CHANNEL_TRACEFILE_COUNT
;
1603 switch (domain
->type
) {
1604 case LTTNG_DOMAIN_KERNEL
:
1605 attr
->switch_timer_interval
= DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER
;
1606 attr
->read_timer_interval
= DEFAULT_KERNEL_CHANNEL_READ_TIMER
;
1607 attr
->subbuf_size
= default_get_kernel_channel_subbuf_size();
1608 attr
->num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
1609 attr
->output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
1611 case LTTNG_DOMAIN_UST
:
1612 switch (domain
->buf_type
) {
1613 case LTTNG_BUFFER_PER_UID
:
1614 attr
->subbuf_size
= default_get_ust_uid_channel_subbuf_size();
1615 attr
->num_subbuf
= DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM
;
1616 attr
->output
= DEFAULT_UST_UID_CHANNEL_OUTPUT
;
1617 attr
->switch_timer_interval
= DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER
;
1618 attr
->read_timer_interval
= DEFAULT_UST_UID_CHANNEL_READ_TIMER
;
1620 case LTTNG_BUFFER_PER_PID
:
1622 attr
->subbuf_size
= default_get_ust_pid_channel_subbuf_size();
1623 attr
->num_subbuf
= DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM
;
1624 attr
->output
= DEFAULT_UST_PID_CHANNEL_OUTPUT
;
1625 attr
->switch_timer_interval
= DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER
;
1626 attr
->read_timer_interval
= DEFAULT_UST_PID_CHANNEL_READ_TIMER
;
1630 /* Default behavior: leave set to 0. */
1636 * Check if session daemon is alive.
1638 * Return 1 if alive or 0 if not.
1639 * On error returns a negative value.
1641 int lttng_session_daemon_alive(void)
1645 ret
= set_session_daemon_path();
1651 if (*sessiond_sock_path
== '\0') {
1653 * No socket path set. Weird error which means the constructor was not
1659 ret
= try_connect_sessiond(sessiond_sock_path
);
1670 * Set URL for a consumer for a session and domain.
1672 * Return 0 on success, else a negative value.
1674 int lttng_set_consumer_url(struct lttng_handle
*handle
,
1675 const char *control_url
, const char *data_url
)
1679 struct lttcomm_session_msg lsm
;
1680 struct lttng_uri
*uris
= NULL
;
1682 if (handle
== NULL
|| (control_url
== NULL
&& data_url
== NULL
)) {
1683 return -LTTNG_ERR_INVALID
;
1686 memset(&lsm
, 0, sizeof(lsm
));
1688 lsm
.cmd_type
= LTTNG_SET_CONSUMER_URI
;
1690 lttng_ctl_copy_string(lsm
.session
.name
, handle
->session_name
,
1691 sizeof(lsm
.session
.name
));
1692 lttng_ctl_copy_lttng_domain(&lsm
.domain
, &handle
->domain
);
1694 size
= uri_parse_str_urls(control_url
, data_url
, &uris
);
1696 return -LTTNG_ERR_INVALID
;
1699 lsm
.u
.uri
.size
= size
;
1701 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1702 sizeof(struct lttng_uri
) * size
, NULL
);
1711 int lttng_enable_consumer(struct lttng_handle
*handle
)
1719 int lttng_disable_consumer(struct lttng_handle
*handle
)
1725 * This is an extension of create session that is ONLY and SHOULD only be used
1726 * by the lttng command line program. It exists to avoid using URI parsing in
1729 * We need the date and time for the trace path subdirectory for the case where
1730 * the user does NOT define one using either -o or -U. Using the normal
1731 * lttng_create_session API call, we have no clue on the session daemon side if
1732 * the URL was generated automatically by the client or define by the user.
1734 * So this function "wrapper" is hidden from the public API, takes the datetime
1735 * string and appends it if necessary to the URI subdirectory before sending it
1736 * to the session daemon.
1738 * With this extra function, the lttng_create_session call behavior is not
1739 * changed and the timestamp is appended to the URI on the session daemon side
1742 int _lttng_create_session_ext(const char *name
, const char *url
,
1743 const char *datetime
)
1747 struct lttcomm_session_msg lsm
;
1748 struct lttng_uri
*uris
= NULL
;
1750 if (name
== NULL
|| datetime
== NULL
) {
1751 return -LTTNG_ERR_INVALID
;
1754 memset(&lsm
, 0, sizeof(lsm
));
1756 lsm
.cmd_type
= LTTNG_CREATE_SESSION
;
1757 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1759 /* There should never be a data URL */
1760 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1762 ret
= -LTTNG_ERR_INVALID
;
1766 lsm
.u
.uri
.size
= size
;
1768 if (size
> 0 && uris
[0].dtype
!= LTTNG_DST_PATH
&& strlen(uris
[0].subdir
) == 0) {
1769 /* Don't append datetime if the name was automatically created. */
1770 if (strncmp(name
, DEFAULT_SESSION_NAME
"-",
1771 strlen(DEFAULT_SESSION_NAME
) + 1)) {
1772 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s-%s",
1775 ret
= snprintf(uris
[0].subdir
, sizeof(uris
[0].subdir
), "%s", name
);
1778 PERROR("snprintf uri subdir");
1779 ret
= -LTTNG_ERR_FATAL
;
1784 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1785 sizeof(struct lttng_uri
) * size
, NULL
);
1793 * For a given session name, this call checks if the data is ready to be read
1794 * or is still being extracted by the consumer(s) hence not ready to be used by
1797 int lttng_data_pending(const char *session_name
)
1800 struct lttcomm_session_msg lsm
;
1802 if (session_name
== NULL
) {
1803 return -LTTNG_ERR_INVALID
;
1806 memset(&lsm
, 0, sizeof(lsm
));
1807 lsm
.cmd_type
= LTTNG_DATA_PENDING
;
1809 lttng_ctl_copy_string(lsm
.session
.name
, session_name
,
1810 sizeof(lsm
.session
.name
));
1812 ret
= lttng_ctl_ask_sessiond(&lsm
, NULL
);
1815 * The lttng_ctl_ask_sessiond function negate the return code if it's not
1816 * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
1817 * that the data is available. Yes it is hackish but for now this is the
1828 * Create a session exclusively used for snapshot.
1830 * Returns LTTNG_OK on success or a negative error code.
1832 int lttng_create_session_snapshot(const char *name
, const char *snapshot_url
)
1836 struct lttcomm_session_msg lsm
;
1837 struct lttng_uri
*uris
= NULL
;
1840 return -LTTNG_ERR_INVALID
;
1843 memset(&lsm
, 0, sizeof(lsm
));
1845 lsm
.cmd_type
= LTTNG_CREATE_SESSION_SNAPSHOT
;
1846 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1848 size
= uri_parse_str_urls(snapshot_url
, NULL
, &uris
);
1850 return -LTTNG_ERR_INVALID
;
1853 lsm
.u
.uri
.size
= size
;
1855 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1856 sizeof(struct lttng_uri
) * size
, NULL
);
1863 * Create a session exclusively used for live.
1865 * Returns LTTNG_OK on success or a negative error code.
1867 int lttng_create_session_live(const char *name
, const char *url
,
1868 unsigned int timer_interval
)
1872 struct lttcomm_session_msg lsm
;
1873 struct lttng_uri
*uris
= NULL
;
1876 return -LTTNG_ERR_INVALID
;
1879 memset(&lsm
, 0, sizeof(lsm
));
1881 lsm
.cmd_type
= LTTNG_CREATE_SESSION_LIVE
;
1882 lttng_ctl_copy_string(lsm
.session
.name
, name
, sizeof(lsm
.session
.name
));
1885 size
= uri_parse_str_urls(url
, NULL
, &uris
);
1887 ret
= -LTTNG_ERR_INVALID
;
1891 /* file:// is not accepted for live session. */
1892 if (uris
[0].dtype
== LTTNG_DST_PATH
) {
1893 ret
= -LTTNG_ERR_INVALID
;
1900 lsm
.u
.session_live
.nb_uri
= size
;
1901 lsm
.u
.session_live
.timer_interval
= timer_interval
;
1903 ret
= lttng_ctl_ask_sessiond_varlen(&lsm
, uris
,
1904 sizeof(struct lttng_uri
) * size
, NULL
);
1914 static void __attribute__((constructor
)) init()
1916 /* Set default session group */
1917 lttng_set_tracing_group(DEFAULT_TRACING_GROUP
);
1923 static void __attribute__((destructor
)) lttng_ctl_exit()
1925 free(tracing_group
);