6 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; only
11 * version 2.1 of the License.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * Mimic system calls for:
24 * - session creation, returns an object descriptor or failure.
25 * - channel creation, returns an object descriptor or failure.
26 * - Operates on a session object descriptor
27 * - Takes all channel options as parameters.
28 * - stream get, returns an object descriptor or failure.
29 * - Operates on a channel object descriptor.
30 * - stream notifier get, returns an object descriptor or failure.
31 * - Operates on a channel object descriptor.
32 * - event creation, returns an object descriptor or failure.
33 * - Operates on a channel object descriptor
34 * - Takes an event name as parameter
35 * - Takes an instrumentation source as parameter
36 * - e.g. tracepoints, dynamic_probes...
37 * - Takes instrumentation source specific arguments.
40 #include <lttng/ust-abi.h>
41 #include <lttng/ust-error.h>
42 #include <urcu/compiler.h>
43 #include <urcu/list.h>
44 #include <lttng/ust-events.h>
45 #include <lttng/ust-version.h>
46 #include <lttng/tracepoint.h>
47 #include "tracepoint-internal.h"
48 #include <usterr-signal-safe.h>
50 #include "ltt-tracer.h"
52 static int lttng_ust_abi_close_in_progress
;
55 int lttng_abi_tracepoint_list(void);
57 int lttng_abi_tracepoint_field_list(void);
60 * Object descriptor table. Should be protected from concurrent access
64 struct lttng_ust_obj
{
68 const struct lttng_ust_objd_ops
*ops
;
71 int freelist_next
; /* offset freelist. end is -1. */
75 struct lttng_ust_objd_table
{
76 struct lttng_ust_obj
*array
;
77 unsigned int len
, allocated_len
;
78 int freelist_head
; /* offset freelist head. end is -1 */
81 static struct lttng_ust_objd_table objd_table
= {
86 int objd_alloc(void *private_data
, const struct lttng_ust_objd_ops
*ops
)
88 struct lttng_ust_obj
*obj
;
90 if (objd_table
.freelist_head
!= -1) {
91 obj
= &objd_table
.array
[objd_table
.freelist_head
];
92 objd_table
.freelist_head
= obj
->u
.freelist_next
;
96 if (objd_table
.len
>= objd_table
.allocated_len
) {
97 unsigned int new_allocated_len
, old_allocated_len
;
98 struct lttng_ust_obj
*new_table
, *old_table
;
100 old_allocated_len
= objd_table
.allocated_len
;
101 old_table
= objd_table
.array
;
102 if (!old_allocated_len
)
103 new_allocated_len
= 1;
105 new_allocated_len
= old_allocated_len
<< 1;
106 new_table
= zmalloc(sizeof(struct lttng_ust_obj
) * new_allocated_len
);
109 memcpy(new_table
, old_table
,
110 sizeof(struct lttng_ust_obj
) * old_allocated_len
);
112 objd_table
.array
= new_table
;
113 objd_table
.allocated_len
= new_allocated_len
;
115 obj
= &objd_table
.array
[objd_table
.len
];
118 obj
->u
.s
.private_data
= private_data
;
120 obj
->u
.s
.f_count
= 2; /* count == 1 : object is allocated */
121 /* count == 2 : allocated + hold ref */
122 return obj
- objd_table
.array
;
126 struct lttng_ust_obj
*_objd_get(int id
)
128 if (id
>= objd_table
.len
)
130 if (!objd_table
.array
[id
].u
.s
.f_count
)
132 return &objd_table
.array
[id
];
136 void *objd_private(int id
)
138 struct lttng_ust_obj
*obj
= _objd_get(id
);
140 return obj
->u
.s
.private_data
;
144 void objd_set_private(int id
, void *private_data
)
146 struct lttng_ust_obj
*obj
= _objd_get(id
);
148 obj
->u
.s
.private_data
= private_data
;
151 const struct lttng_ust_objd_ops
*objd_ops(int id
)
153 struct lttng_ust_obj
*obj
= _objd_get(id
);
161 void objd_free(int id
)
163 struct lttng_ust_obj
*obj
= _objd_get(id
);
166 obj
->u
.freelist_next
= objd_table
.freelist_head
;
167 objd_table
.freelist_head
= obj
- objd_table
.array
;
168 assert(obj
->u
.s
.f_count
== 1);
169 obj
->u
.s
.f_count
= 0; /* deallocated */
173 void objd_ref(int id
)
175 struct lttng_ust_obj
*obj
= _objd_get(id
);
179 int lttng_ust_objd_unref(int id
)
181 struct lttng_ust_obj
*obj
= _objd_get(id
);
185 if (obj
->u
.s
.f_count
== 1) {
186 ERR("Reference counting error\n");
189 if ((--obj
->u
.s
.f_count
) == 1) {
190 const struct lttng_ust_objd_ops
*ops
= objd_ops(id
);
200 void objd_table_destroy(void)
204 for (i
= 0; i
< objd_table
.allocated_len
; i
++)
205 (void) lttng_ust_objd_unref(i
);
206 free(objd_table
.array
);
207 objd_table
.array
= NULL
;
209 objd_table
.allocated_len
= 0;
210 objd_table
.freelist_head
= -1;
214 * This is LTTng's own personal way to create an ABI for sessiond.
215 * We send commands over a socket.
218 static const struct lttng_ust_objd_ops lttng_ops
;
219 static const struct lttng_ust_objd_ops lttng_session_ops
;
220 static const struct lttng_ust_objd_ops lttng_channel_ops
;
221 static const struct lttng_ust_objd_ops lttng_metadata_ops
;
222 static const struct lttng_ust_objd_ops lttng_event_ops
;
223 static const struct lttng_ust_objd_ops lttng_wildcard_ops
;
224 static const struct lttng_ust_objd_ops lib_ring_buffer_objd_ops
;
225 static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops
;
226 static const struct lttng_ust_objd_ops lttng_tracepoint_field_list_ops
;
233 int lttng_abi_create_root_handle(void)
237 root_handle
= objd_alloc(NULL
, <tng_ops
);
242 int lttng_abi_create_session(void)
244 struct ltt_session
*session
;
245 int session_objd
, ret
;
247 session
= ltt_session_create();
250 session_objd
= objd_alloc(session
, <tng_session_ops
);
251 if (session_objd
< 0) {
255 session
->objd
= session_objd
;
259 ltt_session_destroy(session
);
264 long lttng_abi_tracer_version(int objd
,
265 struct lttng_ust_tracer_version
*v
)
267 v
->major
= LTTNG_UST_INTERNAL_MAJOR_VERSION
;
268 v
->minor
= LTTNG_UST_INTERNAL_MINOR_VERSION
;
269 v
->patchlevel
= LTTNG_UST_INTERNAL_PATCHLEVEL_VERSION
;
274 long lttng_abi_add_context(int objd
,
275 struct lttng_ust_context
*context_param
,
276 struct lttng_ctx
**ctx
, struct ltt_session
*session
)
278 if (session
->been_active
)
281 switch (context_param
->ctx
) {
282 case LTTNG_UST_CONTEXT_PTHREAD_ID
:
283 return lttng_add_pthread_id_to_ctx(ctx
);
284 case LTTNG_UST_CONTEXT_VTID
:
285 return lttng_add_vtid_to_ctx(ctx
);
286 case LTTNG_UST_CONTEXT_VPID
:
287 return lttng_add_vpid_to_ctx(ctx
);
288 case LTTNG_UST_CONTEXT_PROCNAME
:
289 return lttng_add_procname_to_ctx(ctx
);
296 * lttng_cmd - lttng control through socket commands
298 * @objd: the object descriptor
301 * @uargs: UST arguments (internal)
303 * This descriptor implements lttng commands:
305 * Returns a LTTng trace session object descriptor
306 * LTTNG_UST_TRACER_VERSION
307 * Returns the LTTng kernel tracer version
308 * LTTNG_UST_TRACEPOINT_LIST
309 * Returns a file descriptor listing available tracepoints
310 * LTTNG_UST_TRACEPOINT_FIELD_LIST
311 * Returns a file descriptor listing available tracepoint fields
312 * LTTNG_UST_WAIT_QUIESCENT
313 * Returns after all previously running probes have completed
315 * The returned session will be deleted when its file descriptor is closed.
318 long lttng_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
319 union ust_args
*uargs
)
322 case LTTNG_UST_SESSION
:
323 return lttng_abi_create_session();
324 case LTTNG_UST_TRACER_VERSION
:
325 return lttng_abi_tracer_version(objd
,
326 (struct lttng_ust_tracer_version
*) arg
);
327 case LTTNG_UST_TRACEPOINT_LIST
:
328 return lttng_abi_tracepoint_list();
329 case LTTNG_UST_TRACEPOINT_FIELD_LIST
:
330 return lttng_abi_tracepoint_field_list();
331 case LTTNG_UST_WAIT_QUIESCENT
:
339 static const struct lttng_ust_objd_ops lttng_ops
= {
344 * We tolerate no failure in this function (if one happens, we print a dmesg
345 * error, but cannot return any error, because the channel information is
349 void lttng_metadata_create_events(int channel_objd
)
351 struct ltt_channel
*channel
= objd_private(channel_objd
);
352 static struct lttng_ust_event metadata_params
= {
353 .instrumentation
= LTTNG_UST_TRACEPOINT
,
354 .name
= "lttng_ust:metadata",
355 .loglevel_type
= LTTNG_UST_LOGLEVEL_ALL
,
356 .loglevel
= TRACE_DEFAULT
,
358 struct ltt_event
*event
;
362 * We tolerate no failure path after event creation. It will stay
363 * invariant for the rest of the session.
365 ret
= ltt_event_create(channel
, &metadata_params
, &event
);
373 return; /* not allowed to return error */
376 int lttng_abi_create_channel(int session_objd
,
377 struct lttng_ust_channel
*chan_param
,
378 enum channel_type channel_type
,
379 union ust_args
*uargs
)
381 struct ltt_session
*session
= objd_private(session_objd
);
382 const struct lttng_ust_objd_ops
*ops
;
383 const char *transport_name
;
384 struct ltt_channel
*chan
;
387 struct ltt_channel chan_priv_init
;
389 switch (channel_type
) {
390 case PER_CPU_CHANNEL
:
391 if (chan_param
->output
== LTTNG_UST_MMAP
) {
392 transport_name
= chan_param
->overwrite
?
393 "relay-overwrite-mmap" : "relay-discard-mmap";
397 ops
= <tng_channel_ops
;
399 case METADATA_CHANNEL
:
400 if (chan_param
->output
== LTTNG_UST_MMAP
)
401 transport_name
= "relay-metadata-mmap";
404 ops
= <tng_metadata_ops
;
407 transport_name
= "<unknown>";
410 chan_objd
= objd_alloc(NULL
, ops
);
415 memset(&chan_priv_init
, 0, sizeof(chan_priv_init
));
416 /* Copy of session UUID for consumer (availability through shm) */
417 memcpy(chan_priv_init
.uuid
, session
->uuid
, sizeof(session
->uuid
));
420 * We tolerate no failure path after channel creation. It will stay
421 * invariant for the rest of the session.
423 chan
= ltt_channel_create(session
, transport_name
, NULL
,
424 chan_param
->subbuf_size
,
425 chan_param
->num_subbuf
,
426 chan_param
->switch_timer_interval
,
427 chan_param
->read_timer_interval
,
428 &uargs
->channel
.shm_fd
,
429 &uargs
->channel
.wait_fd
,
430 &uargs
->channel
.memory_map_size
,
436 objd_set_private(chan_objd
, chan
);
437 chan
->objd
= chan_objd
;
438 if (channel_type
== METADATA_CHANNEL
) {
439 session
->metadata
= chan
;
440 lttng_metadata_create_events(chan_objd
);
442 /* The channel created holds a reference on the session */
443 objd_ref(session_objd
);
451 err
= lttng_ust_objd_unref(chan_objd
);
459 * lttng_session_cmd - lttng session object command
464 * @uargs: UST arguments (internal)
466 * This descriptor implements lttng commands:
468 * Returns a LTTng channel object descriptor
470 * Enables tracing for a session (weak enable)
472 * Disables tracing for a session (strong disable)
474 * Returns a LTTng metadata object descriptor
476 * The returned channel will be deleted when its file descriptor is closed.
479 long lttng_session_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
480 union ust_args
*uargs
)
482 struct ltt_session
*session
= objd_private(objd
);
485 case LTTNG_UST_CHANNEL
:
486 return lttng_abi_create_channel(objd
,
487 (struct lttng_ust_channel
*) arg
,
488 PER_CPU_CHANNEL
, uargs
);
489 case LTTNG_UST_SESSION_START
:
490 case LTTNG_UST_ENABLE
:
491 return ltt_session_enable(session
);
492 case LTTNG_UST_SESSION_STOP
:
493 case LTTNG_UST_DISABLE
:
494 return ltt_session_disable(session
);
495 case LTTNG_UST_METADATA
:
496 return lttng_abi_create_channel(objd
,
497 (struct lttng_ust_channel
*) arg
,
498 METADATA_CHANNEL
, uargs
);
505 * Called when the last file reference is dropped.
507 * Big fat note: channels and events are invariant for the whole session after
508 * their creation. So this session destruction also destroys all channel and
509 * event structures specific to this session (they are not destroyed when their
510 * individual file is released).
513 int lttng_release_session(int objd
)
515 struct ltt_session
*session
= objd_private(objd
);
518 ltt_session_destroy(session
);
525 static const struct lttng_ust_objd_ops lttng_session_ops
= {
526 .release
= lttng_release_session
,
527 .cmd
= lttng_session_cmd
,
531 long lttng_tracepoint_list_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
532 union ust_args
*uargs
)
534 struct lttng_ust_tracepoint_list
*list
= objd_private(objd
);
535 struct lttng_ust_tracepoint_iter
*tp
=
536 (struct lttng_ust_tracepoint_iter
*) arg
;
537 struct lttng_ust_tracepoint_iter
*iter
;
540 case LTTNG_UST_TRACEPOINT_LIST_GET
:
543 iter
= lttng_ust_tracepoint_list_get_iter_next(list
);
545 return -LTTNG_UST_ERR_NOENT
;
546 if (!strcmp(iter
->name
, "lttng_ust:metadata"))
548 memcpy(tp
, iter
, sizeof(*tp
));
557 int lttng_abi_tracepoint_list(void)
560 struct lttng_ust_tracepoint_list
*list
;
562 list_objd
= objd_alloc(NULL
, <tng_tracepoint_list_ops
);
567 list
= zmalloc(sizeof(*list
));
572 objd_set_private(list_objd
, list
);
574 /* populate list by walking on all registered probes. */
575 ret
= ltt_probes_get_event_list(list
);
587 err
= lttng_ust_objd_unref(list_objd
);
595 int lttng_release_tracepoint_list(int objd
)
597 struct lttng_ust_tracepoint_list
*list
= objd_private(objd
);
600 ltt_probes_prune_event_list(list
);
608 static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops
= {
609 .release
= lttng_release_tracepoint_list
,
610 .cmd
= lttng_tracepoint_list_cmd
,
614 long lttng_tracepoint_field_list_cmd(int objd
, unsigned int cmd
,
615 unsigned long arg
, union ust_args
*uargs
)
617 struct lttng_ust_field_list
*list
= objd_private(objd
);
618 struct lttng_ust_field_iter
*tp
= &uargs
->field_list
.entry
;
619 struct lttng_ust_field_iter
*iter
;
622 case LTTNG_UST_TRACEPOINT_FIELD_LIST_GET
:
625 iter
= lttng_ust_field_list_get_iter_next(list
);
627 return -LTTNG_UST_ERR_NOENT
;
628 if (!strcmp(iter
->event_name
, "lttng_ust:metadata"))
630 memcpy(tp
, iter
, sizeof(*tp
));
639 int lttng_abi_tracepoint_field_list(void)
642 struct lttng_ust_field_list
*list
;
644 list_objd
= objd_alloc(NULL
, <tng_tracepoint_field_list_ops
);
649 list
= zmalloc(sizeof(*list
));
654 objd_set_private(list_objd
, list
);
656 /* populate list by walking on all registered probes. */
657 ret
= ltt_probes_get_field_list(list
);
669 err
= lttng_ust_objd_unref(list_objd
);
677 int lttng_release_tracepoint_field_list(int objd
)
679 struct lttng_ust_field_list
*list
= objd_private(objd
);
682 ltt_probes_prune_field_list(list
);
690 static const struct lttng_ust_objd_ops lttng_tracepoint_field_list_ops
= {
691 .release
= lttng_release_tracepoint_field_list
,
692 .cmd
= lttng_tracepoint_field_list_cmd
,
695 struct stream_priv_data
{
696 struct lttng_ust_lib_ring_buffer
*buf
;
697 struct ltt_channel
*ltt_chan
;
701 int lttng_abi_open_stream(int channel_objd
, struct lttng_ust_stream
*info
,
702 union ust_args
*uargs
)
704 struct ltt_channel
*channel
= objd_private(channel_objd
);
705 struct lttng_ust_lib_ring_buffer
*buf
;
706 struct stream_priv_data
*priv
;
707 int stream_objd
, ret
;
709 buf
= channel
->ops
->buffer_read_open(channel
->chan
, channel
->handle
,
710 &uargs
->stream
.shm_fd
,
711 &uargs
->stream
.wait_fd
,
712 &uargs
->stream
.memory_map_size
);
716 priv
= zmalloc(sizeof(*priv
));
722 priv
->ltt_chan
= channel
;
723 stream_objd
= objd_alloc(priv
, &lib_ring_buffer_objd_ops
);
724 if (stream_objd
< 0) {
728 /* Hold a reference on the channel object descriptor */
729 objd_ref(channel_objd
);
735 channel
->ops
->buffer_read_close(buf
, channel
->handle
);
740 int lttng_abi_create_event(int channel_objd
,
741 struct lttng_ust_event
*event_param
)
743 struct ltt_channel
*channel
= objd_private(channel_objd
);
744 struct ltt_event
*event
;
747 event_param
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
748 event_objd
= objd_alloc(NULL
, <tng_event_ops
);
749 if (event_objd
< 0) {
754 * We tolerate no failure path after event creation. It will stay
755 * invariant for the rest of the session.
757 ret
= ltt_event_create(channel
, event_param
, &event
);
761 objd_set_private(event_objd
, event
);
762 /* The event holds a reference on the channel */
763 objd_ref(channel_objd
);
770 err
= lttng_ust_objd_unref(event_objd
);
778 int lttng_abi_create_wildcard(int channel_objd
,
779 struct lttng_ust_event
*event_param
)
781 struct ltt_channel
*channel
= objd_private(channel_objd
);
782 struct session_wildcard
*wildcard
;
783 int wildcard_objd
, ret
;
785 event_param
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
786 wildcard_objd
= objd_alloc(NULL
, <tng_wildcard_ops
);
787 if (wildcard_objd
< 0) {
792 * We tolerate no failure path after wildcard creation. It will
793 * stay invariant for the rest of the session.
795 ret
= ltt_wildcard_create(channel
, event_param
, &wildcard
);
799 objd_set_private(wildcard_objd
, wildcard
);
800 /* The wildcard holds a reference on the channel */
801 objd_ref(channel_objd
);
802 return wildcard_objd
;
808 err
= lttng_ust_objd_unref(wildcard_objd
);
816 * lttng_channel_cmd - lttng control through object descriptors
818 * @objd: the object descriptor
821 * @uargs: UST arguments (internal)
823 * This object descriptor implements lttng commands:
825 * Returns an event stream object descriptor or failure.
826 * (typically, one event stream records events from one CPU)
828 * Returns an event object descriptor or failure.
830 * Prepend a context field to each event in the channel
832 * Enable recording for events in this channel (weak enable)
834 * Disable recording for events in this channel (strong disable)
836 * Channel and event file descriptors also hold a reference on the session.
839 long lttng_channel_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
840 union ust_args
*uargs
)
842 struct ltt_channel
*channel
= objd_private(objd
);
845 case LTTNG_UST_STREAM
:
847 struct lttng_ust_stream
*stream
;
849 stream
= (struct lttng_ust_stream
*) arg
;
850 /* stream used as output */
851 return lttng_abi_open_stream(objd
, stream
, uargs
);
853 case LTTNG_UST_EVENT
:
855 struct lttng_ust_event
*event_param
=
856 (struct lttng_ust_event
*) arg
;
857 if (event_param
->name
[strlen(event_param
->name
) - 1] == '*') {
858 /* If ends with wildcard, create wildcard. */
859 return lttng_abi_create_wildcard(objd
, event_param
);
861 return lttng_abi_create_event(objd
, event_param
);
864 case LTTNG_UST_CONTEXT
:
865 return lttng_abi_add_context(objd
,
866 (struct lttng_ust_context
*) arg
,
867 &channel
->ctx
, channel
->session
);
868 case LTTNG_UST_ENABLE
:
869 return ltt_channel_enable(channel
);
870 case LTTNG_UST_DISABLE
:
871 return ltt_channel_disable(channel
);
872 case LTTNG_UST_FLUSH_BUFFER
:
873 return channel
->ops
->flush_buffer(channel
->chan
, channel
->handle
);
880 * lttng_metadata_cmd - lttng control through object descriptors
882 * @objd: the object descriptor
885 * @uargs: UST arguments (internal)
887 * This object descriptor implements lttng commands:
889 * Returns an event stream file descriptor or failure.
891 * Channel and event file descriptors also hold a reference on the session.
894 long lttng_metadata_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
895 union ust_args
*uargs
)
897 struct ltt_channel
*channel
= objd_private(objd
);
900 case LTTNG_UST_STREAM
:
902 struct lttng_ust_stream
*stream
;
904 stream
= (struct lttng_ust_stream
*) arg
;
905 /* stream used as output */
906 return lttng_abi_open_stream(objd
, stream
, uargs
);
908 case LTTNG_UST_FLUSH_BUFFER
:
909 return channel
->ops
->flush_buffer(channel
->chan
, channel
->handle
);
917 * lttng_channel_poll - lttng stream addition/removal monitoring
922 unsigned int lttng_channel_poll(struct file
*file
, poll_table
*wait
)
924 struct ltt_channel
*channel
= file
->private_data
;
925 unsigned int mask
= 0;
927 if (file
->f_mode
& FMODE_READ
) {
928 poll_wait_set_exclusive(wait
);
929 poll_wait(file
, channel
->ops
->get_hp_wait_queue(channel
->chan
),
932 if (channel
->ops
->is_disabled(channel
->chan
))
934 if (channel
->ops
->is_finalized(channel
->chan
))
936 if (channel
->ops
->buffer_has_read_closed_stream(channel
->chan
))
937 return POLLIN
| POLLRDNORM
;
946 int lttng_channel_release(int objd
)
948 struct ltt_channel
*channel
= objd_private(objd
);
951 return lttng_ust_objd_unref(channel
->session
->objd
);
955 static const struct lttng_ust_objd_ops lttng_channel_ops
= {
956 .release
= lttng_channel_release
,
957 //.poll = lttng_channel_poll,
958 .cmd
= lttng_channel_cmd
,
961 static const struct lttng_ust_objd_ops lttng_metadata_ops
= {
962 .release
= lttng_channel_release
,
963 .cmd
= lttng_metadata_cmd
,
967 * lttng_rb_cmd - lttng ring buffer control through object descriptors
969 * @objd: the object descriptor
972 * @uargs: UST arguments (internal)
974 * This object descriptor implements lttng commands:
975 * (None for now. Access is done directly though shm.)
978 long lttng_rb_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
979 union ust_args
*uargs
)
988 int lttng_rb_release(int objd
)
990 struct stream_priv_data
*priv
= objd_private(objd
);
991 struct lttng_ust_lib_ring_buffer
*buf
;
992 struct ltt_channel
*channel
;
996 channel
= priv
->ltt_chan
;
999 * If we are at ABI exit, we don't want to close the
1000 * buffer opened for read: it is being shared between
1001 * the parent and child (right after fork), and we don't
1002 * want the child to close it for the parent. For a real
1003 * exit, we don't care about marking it as closed, as
1004 * the consumer daemon (if there is one) will do fine
1005 * even if we don't mark it as "closed" for reading on
1007 * We only mark it as closed if it is being explicitely
1008 * released by the session daemon with an explicit
1011 if (!lttng_ust_abi_close_in_progress
)
1012 channel
->ops
->buffer_read_close(buf
, channel
->handle
);
1014 return lttng_ust_objd_unref(channel
->objd
);
1019 static const struct lttng_ust_objd_ops lib_ring_buffer_objd_ops
= {
1020 .release
= lttng_rb_release
,
1021 .cmd
= lttng_rb_cmd
,
1025 * lttng_event_cmd - lttng control through object descriptors
1027 * @objd: the object descriptor
1030 * @uargs: UST arguments (internal)
1032 * This object descriptor implements lttng commands:
1034 * Prepend a context field to each record of this event
1036 * Enable recording for this event (weak enable)
1038 * Disable recording for this event (strong disable)
1040 * Attach a filter to an event.
1043 long lttng_event_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
1044 union ust_args
*uargs
)
1046 struct ltt_event
*event
= objd_private(objd
);
1049 case LTTNG_UST_CONTEXT
:
1050 return lttng_abi_add_context(objd
,
1051 (struct lttng_ust_context
*) arg
,
1052 &event
->ctx
, event
->chan
->session
);
1053 case LTTNG_UST_ENABLE
:
1054 return ltt_event_enable(event
);
1055 case LTTNG_UST_DISABLE
:
1056 return ltt_event_disable(event
);
1057 case LTTNG_UST_FILTER
:
1060 ret
= lttng_filter_event_attach_bytecode(event
,
1061 (struct lttng_ust_filter_bytecode
*) arg
);
1064 lttng_filter_event_link_bytecode(event
,
1065 event
->filter_bytecode
);
1074 int lttng_event_release(int objd
)
1076 struct ltt_event
*event
= objd_private(objd
);
1079 return lttng_ust_objd_unref(event
->chan
->objd
);
1083 /* TODO: filter control ioctl */
1084 static const struct lttng_ust_objd_ops lttng_event_ops
= {
1085 .release
= lttng_event_release
,
1086 .cmd
= lttng_event_cmd
,
1090 * lttng_wildcard_cmd - lttng control through object descriptors
1092 * @objd: the object descriptor
1095 * @uargs: UST arguments (internal)
1097 * This object descriptor implements lttng commands:
1099 * Prepend a context field to each record of events of this
1102 * Enable recording for these wildcard events (weak enable)
1104 * Disable recording for these wildcard events (strong disable)
1106 * Attach a filter to a wildcard.
1109 long lttng_wildcard_cmd(int objd
, unsigned int cmd
, unsigned long arg
,
1110 union ust_args
*uargs
)
1112 struct session_wildcard
*wildcard
= objd_private(objd
);
1115 case LTTNG_UST_CONTEXT
:
1116 return -ENOSYS
; /* not implemented yet */
1118 return lttng_abi_add_context(objd
,
1119 (struct lttng_ust_context
*) arg
,
1120 &wildcard
->ctx
, wildcard
->chan
->session
);
1122 case LTTNG_UST_ENABLE
:
1123 return ltt_wildcard_enable(wildcard
);
1124 case LTTNG_UST_DISABLE
:
1125 return ltt_wildcard_disable(wildcard
);
1126 case LTTNG_UST_FILTER
:
1130 ret
= lttng_filter_wildcard_attach_bytecode(wildcard
,
1131 (struct lttng_ust_filter_bytecode
*) arg
);
1134 lttng_filter_wildcard_link_bytecode(wildcard
);
1143 int lttng_wildcard_release(int objd
)
1145 struct session_wildcard
*wildcard
= objd_private(objd
);
1148 return lttng_ust_objd_unref(wildcard
->chan
->objd
);
1152 /* TODO: filter control ioctl */
1153 static const struct lttng_ust_objd_ops lttng_wildcard_ops
= {
1154 .release
= lttng_wildcard_release
,
1155 .cmd
= lttng_wildcard_cmd
,
1158 void lttng_ust_abi_exit(void)
1160 lttng_ust_abi_close_in_progress
= 1;
1161 objd_table_destroy();
1162 lttng_ust_abi_close_in_progress
= 0;