4 * Copyright 2010-2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * Mimic system calls for:
9 * - session creation, returns an object descriptor or failure.
10 * - channel creation, returns an object descriptor or failure.
11 * - Operates on a session object descriptor
12 * - Takes all channel options as parameters.
13 * - stream get, returns an object descriptor or failure.
14 * - Operates on a channel object descriptor.
15 * - stream notifier get, returns an object descriptor or failure.
16 * - Operates on a channel object descriptor.
17 * - event creation, returns an object descriptor or failure.
18 * - Operates on a channel object descriptor
19 * - Takes an event name as parameter
20 * - Takes an instrumentation source as parameter
21 * - e.g. tracepoints, dynamic_probes...
22 * - Takes instrumentation source specific arguments.
24 * Dual LGPL v2.1/GPL v2 license.
27 #include <lttng/ust-abi.h>
28 #include <urcu/compiler.h>
29 #include <urcu/list.h>
30 #include <lttng/ust-events.h>
31 #include <lttng/ust-version.h>
32 #include <usterr-signal-safe.h>
34 #include "ltt-tracer.h"
35 #include "tracepoint-internal.h"
37 static int lttng_ust_abi_close_in_progress
;
40 int lttng_abi_tracepoint_list(void);
43 * Object descriptor table. Should be protected from concurrent access
47 struct lttng_ust_obj
{
51 const struct lttng_ust_objd_ops
*ops
;
54 int freelist_next
; /* offset freelist. end is -1. */
58 struct lttng_ust_objd_table
{
59 struct lttng_ust_obj
*array
;
60 unsigned int len
, allocated_len
;
61 int freelist_head
; /* offset freelist head. end is -1 */
64 static struct lttng_ust_objd_table objd_table
= {
69 int objd_alloc(void *private_data
, const struct lttng_ust_objd_ops
*ops
)
71 struct lttng_ust_obj
*obj
;
73 if (objd_table
.freelist_head
!= -1) {
74 obj
= &objd_table
.array
[objd_table
.freelist_head
];
75 objd_table
.freelist_head
= obj
->u
.freelist_next
;
79 if (objd_table
.len
>= objd_table
.allocated_len
) {
80 unsigned int new_allocated_len
, old_allocated_len
;
81 struct lttng_ust_obj
*new_table
, *old_table
;
83 old_allocated_len
= objd_table
.allocated_len
;
84 old_table
= objd_table
.array
;
85 if (!old_allocated_len
)
86 new_allocated_len
= 1;
88 new_allocated_len
= old_allocated_len
<< 1;
89 new_table
= zmalloc(sizeof(struct lttng_ust_obj
) * new_allocated_len
);
92 memcpy(new_table
, old_table
,
93 sizeof(struct lttng_ust_obj
) * old_allocated_len
);
95 objd_table
.array
= new_table
;
96 objd_table
.allocated_len
= new_allocated_len
;
98 obj
= &objd_table
.array
[objd_table
.len
];
101 obj
->u
.s
.private_data
= private_data
;
103 obj
->u
.s
.f_count
= 2; /* count == 1 : object is allocated */
104 /* count == 2 : allocated + hold ref */
105 return obj
- objd_table
.array
;
109 struct lttng_ust_obj
*_objd_get(int id
)
111 if (id
>= objd_table
.len
)
113 if (!objd_table
.array
[id
].u
.s
.f_count
)
115 return &objd_table
.array
[id
];
119 void *objd_private(int id
)
121 struct lttng_ust_obj
*obj
= _objd_get(id
);
123 return obj
->u
.s
.private_data
;
127 void objd_set_private(int id
, void *private_data
)
129 struct lttng_ust_obj
*obj
= _objd_get(id
);
131 obj
->u
.s
.private_data
= private_data
;
134 const struct lttng_ust_objd_ops
*objd_ops(int id
)
136 struct lttng_ust_obj
*obj
= _objd_get(id
);
144 void objd_free(int id
)
146 struct lttng_ust_obj
*obj
= _objd_get(id
);
149 obj
->u
.freelist_next
= objd_table
.freelist_head
;
150 objd_table
.freelist_head
= obj
- objd_table
.array
;
151 assert(obj
->u
.s
.f_count
== 1);
152 obj
->u
.s
.f_count
= 0; /* deallocated */
156 void objd_ref(int id
)
158 struct lttng_ust_obj
*obj
= _objd_get(id
);
162 int lttng_ust_objd_unref(int id
)
164 struct lttng_ust_obj
*obj
= _objd_get(id
);
168 if (obj
->u
.s
.f_count
== 1) {
169 ERR("Reference counting error\n");
172 if ((--obj
->u
.s
.f_count
) == 1) {
173 const struct lttng_ust_objd_ops
*ops
= objd_ops(id
);
183 void objd_table_destroy(void)
187 for (i
= 0; i
< objd_table
.allocated_len
; i
++)
188 (void) lttng_ust_objd_unref(i
);
189 free(objd_table
.array
);
190 objd_table
.array
= NULL
;
192 objd_table
.allocated_len
= 0;
193 objd_table
.freelist_head
= -1;
197 * This is LTTng's own personal way to create an ABI for sessiond.
198 * We send commands over a socket.
201 static const struct lttng_ust_objd_ops lttng_ops
;
202 static const struct lttng_ust_objd_ops lttng_session_ops
;
203 static const struct lttng_ust_objd_ops lttng_channel_ops
;
204 static const struct lttng_ust_objd_ops lttng_metadata_ops
;
205 static const struct lttng_ust_objd_ops lttng_event_ops
;
206 static const struct lttng_ust_objd_ops lttng_loglevel_ops
;
207 static const struct lttng_ust_objd_ops lttng_wildcard_ops
;
208 static const struct lttng_ust_objd_ops lib_ring_buffer_objd_ops
;
209 static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops
;
216 int lttng_abi_create_root_handle(void)
220 root_handle
= objd_alloc(NULL
, <tng_ops
);
225 int lttng_abi_create_session(void)
227 struct ltt_session
*session
;
228 int session_objd
, ret
;
230 session
= ltt_session_create();
233 session_objd
= objd_alloc(session
, <tng_session_ops
);
234 if (session_objd
< 0) {
238 session
->objd
= session_objd
;
242 ltt_session_destroy(session
);
247 long lttng_abi_tracer_version(int objd
,
248 struct lttng_ust_tracer_version
*v
)
250 v
->major
= LTTNG_UST_MAJOR_VERSION
;
251 v
->minor
= LTTNG_UST_MINOR_VERSION
;
252 v
->patchlevel
= LTTNG_UST_PATCHLEVEL_VERSION
;
257 long lttng_abi_add_context(int objd
,
258 struct lttng_ust_context
*context_param
,
259 struct lttng_ctx
**ctx
, struct ltt_session
*session
)
261 if (session
->been_active
)
264 switch (context_param
->ctx
) {
265 case LTTNG_UST_CONTEXT_PTHREAD_ID
:
266 return lttng_add_pthread_id_to_ctx(ctx
);
267 case LTTNG_UST_CONTEXT_VTID
:
268 return lttng_add_vtid_to_ctx(ctx
);
269 case LTTNG_UST_CONTEXT_VPID
:
270 return lttng_add_vpid_to_ctx(ctx
);
271 case LTTNG_UST_CONTEXT_PROCNAME
:
272 return lttng_add_procname_to_ctx(ctx
);
279 * lttng_cmd - lttng control through socket commands
281 * @objd: the object descriptor
285 * This descriptor implements lttng commands:
287 * Returns a LTTng trace session object descriptor
288 * LTTNG_UST_TRACER_VERSION
289 * Returns the LTTng kernel tracer version
290 * LTTNG_UST_TRACEPOINT_LIST
291 * Returns a file descriptor listing available tracepoints
292 * LTTNG_UST_WAIT_QUIESCENT
293 * Returns after all previously running probes have completed
295 * The returned session will be deleted when its file descriptor is closed.
298 long lttng_cmd(int objd
, unsigned int cmd
, unsigned long arg
)
301 case LTTNG_UST_SESSION
:
302 return lttng_abi_create_session();
303 case LTTNG_UST_TRACER_VERSION
:
304 return lttng_abi_tracer_version(objd
,
305 (struct lttng_ust_tracer_version
*) arg
);
306 case LTTNG_UST_TRACEPOINT_LIST
:
307 return lttng_abi_tracepoint_list();
308 case LTTNG_UST_WAIT_QUIESCENT
:
316 static const struct lttng_ust_objd_ops lttng_ops
= {
321 * We tolerate no failure in this function (if one happens, we print a dmesg
322 * error, but cannot return any error, because the channel information is
326 void lttng_metadata_create_events(int channel_objd
)
328 struct ltt_channel
*channel
= objd_private(channel_objd
);
329 static struct lttng_ust_event metadata_params
= {
330 .instrumentation
= LTTNG_UST_TRACEPOINT
,
331 .name
= "lttng_ust:metadata",
333 struct ltt_event
*event
;
337 * We tolerate no failure path after event creation. It will stay
338 * invariant for the rest of the session.
340 ret
= ltt_event_create(channel
, &metadata_params
, NULL
, &event
);
348 return; /* not allowed to return error */
351 int lttng_abi_create_channel(int session_objd
,
352 struct lttng_ust_channel
*chan_param
,
353 enum channel_type channel_type
)
355 struct ltt_session
*session
= objd_private(session_objd
);
356 const struct lttng_ust_objd_ops
*ops
;
357 const char *transport_name
;
358 struct ltt_channel
*chan
;
361 struct ltt_channel chan_priv_init
;
363 switch (channel_type
) {
364 case PER_CPU_CHANNEL
:
365 if (chan_param
->output
== LTTNG_UST_MMAP
) {
366 transport_name
= chan_param
->overwrite
?
367 "relay-overwrite-mmap" : "relay-discard-mmap";
371 ops
= <tng_channel_ops
;
373 case METADATA_CHANNEL
:
374 if (chan_param
->output
== LTTNG_UST_MMAP
)
375 transport_name
= "relay-metadata-mmap";
378 ops
= <tng_metadata_ops
;
381 transport_name
= "<unknown>";
384 chan_objd
= objd_alloc(NULL
, ops
);
389 memset(&chan_priv_init
, 0, sizeof(chan_priv_init
));
390 /* Copy of session UUID for consumer (availability through shm) */
391 memcpy(chan_priv_init
.uuid
, session
->uuid
, sizeof(session
->uuid
));
394 * We tolerate no failure path after channel creation. It will stay
395 * invariant for the rest of the session.
397 chan
= ltt_channel_create(session
, transport_name
, NULL
,
398 chan_param
->subbuf_size
,
399 chan_param
->num_subbuf
,
400 chan_param
->switch_timer_interval
,
401 chan_param
->read_timer_interval
,
403 &chan_param
->wait_fd
,
404 &chan_param
->memory_map_size
,
410 objd_set_private(chan_objd
, chan
);
411 chan
->objd
= chan_objd
;
412 if (channel_type
== METADATA_CHANNEL
) {
413 session
->metadata
= chan
;
414 lttng_metadata_create_events(chan_objd
);
416 /* The channel created holds a reference on the session */
417 objd_ref(session_objd
);
425 err
= lttng_ust_objd_unref(chan_objd
);
433 * lttng_session_cmd - lttng session object command
439 * This descriptor implements lttng commands:
441 * Returns a LTTng channel object descriptor
443 * Enables tracing for a session (weak enable)
445 * Disables tracing for a session (strong disable)
447 * Returns a LTTng metadata object descriptor
449 * The returned channel will be deleted when its file descriptor is closed.
452 long lttng_session_cmd(int objd
, unsigned int cmd
, unsigned long arg
)
454 struct ltt_session
*session
= objd_private(objd
);
457 case LTTNG_UST_CHANNEL
:
458 return lttng_abi_create_channel(objd
,
459 (struct lttng_ust_channel
*) arg
,
461 case LTTNG_UST_SESSION_START
:
462 case LTTNG_UST_ENABLE
:
463 return ltt_session_enable(session
);
464 case LTTNG_UST_SESSION_STOP
:
465 case LTTNG_UST_DISABLE
:
466 return ltt_session_disable(session
);
467 case LTTNG_UST_METADATA
:
468 return lttng_abi_create_channel(objd
,
469 (struct lttng_ust_channel
*) arg
,
477 * Called when the last file reference is dropped.
479 * Big fat note: channels and events are invariant for the whole session after
480 * their creation. So this session destruction also destroys all channel and
481 * event structures specific to this session (they are not destroyed when their
482 * individual file is released).
485 int lttng_release_session(int objd
)
487 struct ltt_session
*session
= objd_private(objd
);
490 ltt_session_destroy(session
);
497 static const struct lttng_ust_objd_ops lttng_session_ops
= {
498 .release
= lttng_release_session
,
499 .cmd
= lttng_session_cmd
,
503 long lttng_tracepoint_list_cmd(int objd
, unsigned int cmd
, unsigned long arg
)
505 struct lttng_ust_tracepoint_list
*list
= objd_private(objd
);
506 struct lttng_ust_tracepoint_iter
*tp
=
507 (struct lttng_ust_tracepoint_iter
*) arg
;
508 struct lttng_ust_tracepoint_iter
*iter
;
511 case LTTNG_UST_TRACEPOINT_LIST_GET
:
514 iter
= lttng_ust_tracepoint_list_get_iter_next(list
);
517 if (!strcmp(iter
->name
, "lttng_ust:metadata"))
519 memcpy(tp
, iter
, sizeof(*tp
));
528 int lttng_abi_tracepoint_list(void)
531 struct lttng_ust_tracepoint_list
*list
;
533 list_objd
= objd_alloc(NULL
, <tng_tracepoint_list_ops
);
538 list
= zmalloc(sizeof(*list
));
543 objd_set_private(list_objd
, list
);
545 /* populate list by walking on all registered probes. */
546 ret
= ltt_probes_get_event_list(list
);
558 err
= lttng_ust_objd_unref(list_objd
);
566 int lttng_release_tracepoint_list(int objd
)
568 struct lttng_ust_tracepoint_list
*list
= objd_private(objd
);
571 ltt_probes_prune_event_list(list
);
579 static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops
= {
580 .release
= lttng_release_tracepoint_list
,
581 .cmd
= lttng_tracepoint_list_cmd
,
584 struct stream_priv_data
{
585 struct lttng_ust_lib_ring_buffer
*buf
;
586 struct ltt_channel
*ltt_chan
;
590 int lttng_abi_open_stream(int channel_objd
, struct lttng_ust_stream
*info
)
592 struct ltt_channel
*channel
= objd_private(channel_objd
);
593 struct lttng_ust_lib_ring_buffer
*buf
;
594 struct stream_priv_data
*priv
;
595 int stream_objd
, ret
;
597 buf
= channel
->ops
->buffer_read_open(channel
->chan
, channel
->handle
,
598 &info
->shm_fd
, &info
->wait_fd
, &info
->memory_map_size
);
602 priv
= zmalloc(sizeof(*priv
));
608 priv
->ltt_chan
= channel
;
609 stream_objd
= objd_alloc(priv
, &lib_ring_buffer_objd_ops
);
610 if (stream_objd
< 0) {
614 /* Hold a reference on the channel object descriptor */
615 objd_ref(channel_objd
);
621 channel
->ops
->buffer_read_close(buf
, channel
->handle
);
626 int lttng_abi_create_event(int channel_objd
,
627 struct lttng_ust_event
*event_param
)
629 struct ltt_channel
*channel
= objd_private(channel_objd
);
630 struct ltt_event
*event
;
633 event_param
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
634 event_objd
= objd_alloc(NULL
, <tng_event_ops
);
635 if (event_objd
< 0) {
640 * We tolerate no failure path after event creation. It will stay
641 * invariant for the rest of the session.
643 ret
= ltt_event_create(channel
, event_param
, NULL
, &event
);
647 objd_set_private(event_objd
, event
);
648 /* The event holds a reference on the channel */
649 objd_ref(channel_objd
);
656 err
= lttng_ust_objd_unref(event_objd
);
664 int lttng_abi_create_loglevel(int channel_objd
,
665 struct lttng_ust_event
*event_param
)
667 struct ltt_channel
*channel
= objd_private(channel_objd
);
668 struct session_loglevel
*loglevel
;
669 int loglevel_objd
, ret
;
671 event_param
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
672 loglevel_objd
= objd_alloc(NULL
, <tng_loglevel_ops
);
673 if (loglevel_objd
< 0) {
678 * We tolerate no failure path after loglevel creation. It will
679 * stay invariant for the rest of the session.
681 ret
= ltt_loglevel_create(channel
, event_param
, &loglevel
);
685 objd_set_private(loglevel_objd
, loglevel
);
686 /* The loglevel holds a reference on the channel */
687 objd_ref(channel_objd
);
688 return loglevel_objd
;
694 err
= lttng_ust_objd_unref(loglevel_objd
);
702 int lttng_abi_create_wildcard(int channel_objd
,
703 struct lttng_ust_event
*event_param
)
705 struct ltt_channel
*channel
= objd_private(channel_objd
);
706 struct session_wildcard
*wildcard
;
707 int wildcard_objd
, ret
;
709 event_param
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
710 wildcard_objd
= objd_alloc(NULL
, <tng_wildcard_ops
);
711 if (wildcard_objd
< 0) {
716 * We tolerate no failure path after wildcard creation. It will
717 * stay invariant for the rest of the session.
719 ret
= ltt_wildcard_create(channel
, event_param
, &wildcard
);
723 objd_set_private(wildcard_objd
, wildcard
);
724 /* The wildcard holds a reference on the channel */
725 objd_ref(channel_objd
);
726 return wildcard_objd
;
732 err
= lttng_ust_objd_unref(wildcard_objd
);
740 * lttng_channel_cmd - lttng control through object descriptors
742 * @objd: the object descriptor
746 * This object descriptor implements lttng commands:
748 * Returns an event stream object descriptor or failure.
749 * (typically, one event stream records events from one CPU)
751 * Returns an event object descriptor or failure.
753 * Prepend a context field to each event in the channel
755 * Enable recording for events in this channel (weak enable)
757 * Disable recording for events in this channel (strong disable)
759 * Channel and event file descriptors also hold a reference on the session.
762 long lttng_channel_cmd(int objd
, unsigned int cmd
, unsigned long arg
)
764 struct ltt_channel
*channel
= objd_private(objd
);
767 case LTTNG_UST_STREAM
:
769 struct lttng_ust_stream
*stream
;
771 stream
= (struct lttng_ust_stream
*) arg
;
772 /* stream used as output */
773 return lttng_abi_open_stream(objd
, stream
);
775 case LTTNG_UST_EVENT
:
777 struct lttng_ust_event
*event_param
=
778 (struct lttng_ust_event
*) arg
;
779 if (event_param
->instrumentation
== LTTNG_UST_TRACEPOINT_LOGLEVEL
) {
780 return lttng_abi_create_loglevel(objd
, event_param
);
782 if (event_param
->name
[strlen(event_param
->name
) - 1] == '*') {
783 /* If ends with wildcard, create wildcard. */
784 return lttng_abi_create_wildcard(objd
, event_param
);
786 return lttng_abi_create_event(objd
, event_param
);
790 case LTTNG_UST_CONTEXT
:
791 return lttng_abi_add_context(objd
,
792 (struct lttng_ust_context
*) arg
,
793 &channel
->ctx
, channel
->session
);
794 case LTTNG_UST_ENABLE
:
795 return ltt_channel_enable(channel
);
796 case LTTNG_UST_DISABLE
:
797 return ltt_channel_disable(channel
);
798 case LTTNG_UST_FLUSH_BUFFER
:
799 return channel
->ops
->flush_buffer(channel
->chan
, channel
->handle
);
806 * lttng_metadata_cmd - lttng control through object descriptors
808 * @objd: the object descriptor
812 * This object descriptor implements lttng commands:
814 * Returns an event stream file descriptor or failure.
816 * Channel and event file descriptors also hold a reference on the session.
819 long lttng_metadata_cmd(int objd
, unsigned int cmd
, unsigned long arg
)
821 struct ltt_channel
*channel
= objd_private(objd
);
824 case LTTNG_UST_STREAM
:
826 struct lttng_ust_stream
*stream
;
828 stream
= (struct lttng_ust_stream
*) arg
;
829 /* stream used as output */
830 return lttng_abi_open_stream(objd
, stream
);
832 case LTTNG_UST_FLUSH_BUFFER
:
833 return channel
->ops
->flush_buffer(channel
->chan
, channel
->handle
);
841 * lttng_channel_poll - lttng stream addition/removal monitoring
846 unsigned int lttng_channel_poll(struct file
*file
, poll_table
*wait
)
848 struct ltt_channel
*channel
= file
->private_data
;
849 unsigned int mask
= 0;
851 if (file
->f_mode
& FMODE_READ
) {
852 poll_wait_set_exclusive(wait
);
853 poll_wait(file
, channel
->ops
->get_hp_wait_queue(channel
->chan
),
856 if (channel
->ops
->is_disabled(channel
->chan
))
858 if (channel
->ops
->is_finalized(channel
->chan
))
860 if (channel
->ops
->buffer_has_read_closed_stream(channel
->chan
))
861 return POLLIN
| POLLRDNORM
;
870 int lttng_channel_release(int objd
)
872 struct ltt_channel
*channel
= objd_private(objd
);
875 return lttng_ust_objd_unref(channel
->session
->objd
);
879 static const struct lttng_ust_objd_ops lttng_channel_ops
= {
880 .release
= lttng_channel_release
,
881 //.poll = lttng_channel_poll,
882 .cmd
= lttng_channel_cmd
,
885 static const struct lttng_ust_objd_ops lttng_metadata_ops
= {
886 .release
= lttng_channel_release
,
887 .cmd
= lttng_metadata_cmd
,
891 * lttng_rb_cmd - lttng ring buffer control through object descriptors
893 * @objd: the object descriptor
897 * This object descriptor implements lttng commands:
898 * (None for now. Access is done directly though shm.)
901 long lttng_rb_cmd(int objd
, unsigned int cmd
, unsigned long arg
)
910 int lttng_rb_release(int objd
)
912 struct stream_priv_data
*priv
= objd_private(objd
);
913 struct lttng_ust_lib_ring_buffer
*buf
;
914 struct ltt_channel
*channel
;
918 channel
= priv
->ltt_chan
;
921 * If we are at ABI exit, we don't want to close the
922 * buffer opened for read: it is being shared between
923 * the parent and child (right after fork), and we don't
924 * want the child to close it for the parent. For a real
925 * exit, we don't care about marking it as closed, as
926 * the consumer daemon (if there is one) will do fine
927 * even if we don't mark it as "closed" for reading on
929 * We only mark it as closed if it is being explicitely
930 * released by the session daemon with an explicit
933 if (!lttng_ust_abi_close_in_progress
)
934 channel
->ops
->buffer_read_close(buf
, channel
->handle
);
936 return lttng_ust_objd_unref(channel
->objd
);
941 static const struct lttng_ust_objd_ops lib_ring_buffer_objd_ops
= {
942 .release
= lttng_rb_release
,
947 * lttng_event_cmd - lttng control through object descriptors
949 * @objd: the object descriptor
953 * This object descriptor implements lttng commands:
955 * Prepend a context field to each record of this event
957 * Enable recording for this event (weak enable)
959 * Disable recording for this event (strong disable)
962 long lttng_event_cmd(int objd
, unsigned int cmd
, unsigned long arg
)
964 struct ltt_event
*event
= objd_private(objd
);
967 case LTTNG_UST_CONTEXT
:
968 return lttng_abi_add_context(objd
,
969 (struct lttng_ust_context
*) arg
,
970 &event
->ctx
, event
->chan
->session
);
971 case LTTNG_UST_ENABLE
:
972 return ltt_event_enable(event
);
973 case LTTNG_UST_DISABLE
:
974 return ltt_event_disable(event
);
981 int lttng_event_release(int objd
)
983 struct ltt_event
*event
= objd_private(objd
);
986 return lttng_ust_objd_unref(event
->chan
->objd
);
990 /* TODO: filter control ioctl */
991 static const struct lttng_ust_objd_ops lttng_event_ops
= {
992 .release
= lttng_event_release
,
993 .cmd
= lttng_event_cmd
,
997 * lttng_loglevel_cmd - lttng control through object descriptors
999 * @objd: the object descriptor
1003 * This object descriptor implements lttng commands:
1005 * Prepend a context field to each record of events of this
1008 * Enable recording for these loglevel events (weak enable)
1010 * Disable recording for these loglevel events (strong disable)
1013 long lttng_loglevel_cmd(int objd
, unsigned int cmd
, unsigned long arg
)
1015 struct session_loglevel
*loglevel
= objd_private(objd
);
1018 case LTTNG_UST_CONTEXT
:
1019 return -ENOSYS
; /* not implemented yet */
1021 return lttng_abi_add_context(objd
,
1022 (struct lttng_ust_context
*) arg
,
1023 &loglevel
->ctx
, loglevel
->chan
->session
);
1025 case LTTNG_UST_ENABLE
:
1026 return ltt_loglevel_enable(loglevel
);
1027 case LTTNG_UST_DISABLE
:
1028 return ltt_loglevel_disable(loglevel
);
1035 int lttng_loglevel_release(int objd
)
1037 struct session_loglevel
*loglevel
= objd_private(objd
);
1040 return lttng_ust_objd_unref(loglevel
->chan
->objd
);
1044 /* TODO: filter control ioctl */
1045 static const struct lttng_ust_objd_ops lttng_loglevel_ops
= {
1046 .release
= lttng_loglevel_release
,
1047 .cmd
= lttng_loglevel_cmd
,
1051 * lttng_wildcard_cmd - lttng control through object descriptors
1053 * @objd: the object descriptor
1057 * This object descriptor implements lttng commands:
1059 * Prepend a context field to each record of events of this
1062 * Enable recording for these wildcard events (weak enable)
1064 * Disable recording for these wildcard events (strong disable)
1067 long lttng_wildcard_cmd(int objd
, unsigned int cmd
, unsigned long arg
)
1069 struct session_wildcard
*wildcard
= objd_private(objd
);
1072 case LTTNG_UST_CONTEXT
:
1073 return -ENOSYS
; /* not implemented yet */
1075 return lttng_abi_add_context(objd
,
1076 (struct lttng_ust_context
*) arg
,
1077 &wildcard
->ctx
, wildcard
->chan
->session
);
1079 case LTTNG_UST_ENABLE
:
1080 return ltt_wildcard_enable(wildcard
);
1081 case LTTNG_UST_DISABLE
:
1082 return ltt_wildcard_disable(wildcard
);
1089 int lttng_wildcard_release(int objd
)
1091 struct session_wildcard
*wildcard
= objd_private(objd
);
1094 return lttng_ust_objd_unref(wildcard
->chan
->objd
);
1098 /* TODO: filter control ioctl */
1099 static const struct lttng_ust_objd_ops lttng_wildcard_ops
= {
1100 .release
= lttng_wildcard_release
,
1101 .cmd
= lttng_wildcard_cmd
,
1104 void lttng_ust_abi_exit(void)
1106 lttng_ust_abi_close_in_progress
= 1;
1107 objd_table_destroy();
1108 lttng_ust_abi_close_in_progress
= 0;