2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #include <urcu/list.h>
23 #include <lttng/lttng.h>
24 #include <common/error.h>
25 #include <common/sessiond-comm/sessiond-comm.h>
32 #include "trace-kernel.h"
33 #include "trace-ust.h"
36 * Setup a lttng_event used to enable *all* syscall tracing.
38 static void init_syscalls_kernel_event(struct lttng_event
*event
)
40 event
->name
[0] = '\0';
42 * We use LTTNG_EVENT* here since the trace kernel creation will make the
43 * right changes for the kernel.
45 event
->type
= LTTNG_EVENT_SYSCALL
;
49 * Disable kernel tracepoint event for a channel from the kernel session.
51 int event_kernel_disable_tracepoint(struct ltt_kernel_session
*ksession
,
52 struct ltt_kernel_channel
*kchan
, char *event_name
)
55 struct ltt_kernel_event
*kevent
;
57 kevent
= trace_kernel_get_event_by_name(event_name
, kchan
);
59 ret
= LTTCOMM_NO_EVENT
;
63 ret
= kernel_disable_event(kevent
);
65 ret
= LTTCOMM_KERN_DISABLE_FAIL
;
69 DBG("Kernel event %s disable for channel %s.",
70 kevent
->event
->name
, kchan
->channel
->name
);
79 * Disable kernel tracepoint events for a channel from the kernel session.
81 int event_kernel_disable_all_tracepoints(struct ltt_kernel_session
*ksession
,
82 struct ltt_kernel_channel
*kchan
)
85 struct ltt_kernel_event
*kevent
;
87 /* For each event in the kernel session */
88 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
89 ret
= kernel_disable_event(kevent
);
91 /* We continue disabling the rest */
100 * Disable kernel syscall events for a channel from the kernel session.
102 int event_kernel_disable_all_syscalls(struct ltt_kernel_session
*ksession
,
103 struct ltt_kernel_channel
*kchan
)
105 ERR("Cannot disable syscall tracing for existing session. Please destroy session instead.");
106 return LTTCOMM_OK
; /* Return OK so disable all succeeds */
110 * Disable all kernel event for a channel from the kernel session.
112 int event_kernel_disable_all(struct ltt_kernel_session
*ksession
,
113 struct ltt_kernel_channel
*kchan
)
117 ret
= event_kernel_disable_all_tracepoints(ksession
, kchan
);
118 if (ret
!= LTTCOMM_OK
)
120 ret
= event_kernel_disable_all_syscalls(ksession
, kchan
);
125 * Enable kernel tracepoint event for a channel from the kernel session.
127 int event_kernel_enable_tracepoint(struct ltt_kernel_session
*ksession
,
128 struct ltt_kernel_channel
*kchan
, struct lttng_event
*event
)
131 struct ltt_kernel_event
*kevent
;
133 kevent
= trace_kernel_get_event_by_name(event
->name
, kchan
);
134 if (kevent
== NULL
) {
135 ret
= kernel_create_event(event
, kchan
);
137 if (ret
== -EEXIST
) {
138 ret
= LTTCOMM_KERN_EVENT_EXIST
;
140 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
144 } else if (kevent
->enabled
== 0) {
145 ret
= kernel_enable_event(kevent
);
147 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
151 /* At this point, the event is considered enabled */
152 ret
= LTTCOMM_KERN_EVENT_EXIST
;
162 * Enable all kernel tracepoint events of a channel of the kernel session.
164 int event_kernel_enable_all_tracepoints(struct ltt_kernel_session
*ksession
,
165 struct ltt_kernel_channel
*kchan
, int kernel_tracer_fd
)
168 struct ltt_kernel_event
*kevent
;
169 struct lttng_event
*event_list
= NULL
;
171 /* For each event in the kernel session */
172 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
173 if (kevent
->enabled
== 0) {
174 ret
= kernel_enable_event(kevent
);
176 /* Enable failed but still continue */
182 size
= kernel_list_events(kernel_tracer_fd
, &event_list
);
184 ret
= LTTCOMM_KERN_LIST_FAIL
;
188 for (i
= 0; i
< size
; i
++) {
189 kevent
= trace_kernel_get_event_by_name(event_list
[i
].name
, kchan
);
190 if (kevent
== NULL
) {
191 /* Default event type for enable all */
192 event_list
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
193 /* Enable each single tracepoint event */
194 ret
= kernel_create_event(&event_list
[i
], kchan
);
196 /* Ignore error here and continue */
209 * Enable all kernel tracepoint events of a channel of the kernel session.
211 int event_kernel_enable_all_syscalls(struct ltt_kernel_session
*ksession
,
212 struct ltt_kernel_channel
*kchan
, int kernel_tracer_fd
)
215 struct lttng_event event
;
217 init_syscalls_kernel_event(&event
);
219 DBG("Enabling all syscall tracing");
221 ret
= kernel_create_event(&event
, kchan
);
223 if (ret
== -EEXIST
) {
224 ret
= LTTCOMM_KERN_EVENT_EXIST
;
226 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
237 * Enable all kernel events of a channel of the kernel session.
239 int event_kernel_enable_all(struct ltt_kernel_session
*ksession
,
240 struct ltt_kernel_channel
*kchan
, int kernel_tracer_fd
)
244 ret
= event_kernel_enable_all_tracepoints(ksession
, kchan
, kernel_tracer_fd
);
245 if (ret
!= LTTCOMM_OK
) {
248 ret
= event_kernel_enable_all_syscalls(ksession
, kchan
, kernel_tracer_fd
);
254 * ============================
255 * UST : The Ultimate Frontier!
256 * ============================
260 * Enable all UST tracepoints for a channel from a UST session.
262 int event_ust_enable_all_tracepoints(struct ltt_ust_session
*usess
, int domain
,
263 struct ltt_ust_channel
*uchan
)
267 struct lttng_ht_iter iter
;
268 struct ltt_ust_event
*uevent
= NULL
;
269 struct lttng_event
*events
= NULL
;
272 case LTTNG_DOMAIN_UST
:
274 /* Enable existing events */
275 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
,
277 if (uevent
->enabled
== 0) {
278 ret
= ust_app_enable_event_glb(usess
, uchan
, uevent
);
286 /* Get all UST available events */
287 size
= ust_app_list_events(&events
);
289 ret
= LTTCOMM_UST_LIST_FAIL
;
293 for (i
= 0; i
< size
; i
++) {
295 * Check if event exist and if so, continue since it was enable
298 uevent
= trace_ust_find_event_by_name(uchan
->events
,
300 if (uevent
!= NULL
) {
301 ret
= ust_app_enable_event_pid(usess
, uchan
, uevent
,
304 if (ret
!= -EEXIST
) {
305 ret
= LTTCOMM_UST_ENABLE_FAIL
;
312 /* Create ust event */
313 uevent
= trace_ust_create_event(&events
[i
]);
314 if (uevent
== NULL
) {
319 /* Create event for the specific PID */
320 ret
= ust_app_enable_event_pid(usess
, uchan
, uevent
,
323 if (ret
== -EEXIST
) {
324 ret
= LTTCOMM_UST_EVENT_EXIST
;
327 ret
= LTTCOMM_UST_ENABLE_FAIL
;
333 /* Add ltt ust event to channel */
335 lttng_ht_add_unique_str(uchan
->events
, &uevent
->node
);
343 case LTTNG_DOMAIN_UST_EXEC_NAME
:
344 case LTTNG_DOMAIN_UST_PID
:
345 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
355 trace_ust_destroy_event(uevent
);
363 * Enable UST tracepoint event for a channel from a UST session.
365 int event_ust_enable_tracepoint(struct ltt_ust_session
*usess
, int domain
,
366 struct ltt_ust_channel
*uchan
, struct lttng_event
*event
)
368 int ret
= LTTCOMM_OK
, to_create
= 0;
369 struct ltt_ust_event
*uevent
;
371 uevent
= trace_ust_find_event_by_name(uchan
->events
, event
->name
);
372 if (uevent
== NULL
) {
373 uevent
= trace_ust_create_event(event
);
374 if (uevent
== NULL
) {
378 /* Valid to set it after the goto error since uevent is still NULL */
382 if (uevent
->enabled
) {
383 /* It's already enabled so everything is OK */
390 case LTTNG_DOMAIN_UST
:
393 /* Create event on all UST registered apps for session */
394 ret
= ust_app_create_event_glb(usess
, uchan
, uevent
);
396 /* Enable event on all UST registered apps for session */
397 ret
= ust_app_enable_event_glb(usess
, uchan
, uevent
);
401 if (ret
== -EEXIST
) {
402 ret
= LTTCOMM_UST_EVENT_EXIST
;
405 ret
= LTTCOMM_UST_ENABLE_FAIL
;
412 case LTTNG_DOMAIN_UST_EXEC_NAME
:
413 case LTTNG_DOMAIN_UST_PID
:
414 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
423 /* Add ltt ust event to channel */
424 lttng_ht_add_unique_str(uchan
->events
, &uevent
->node
);
428 DBG("Event UST %s %s in channel %s", uevent
->attr
.name
,
429 to_create
? "created" : "enabled", uchan
->name
);
438 * Only destroy event on creation time (not enabling time) because if the
439 * event is found in the channel (to_create == 0), it means that at some
440 * point the enable_event worked and it's thus valid to keep it alive.
441 * Destroying it also implies that we also destroy it's shadow copy to sync
445 /* In this code path, the uevent was not added to the hash table */
446 trace_ust_destroy_event(uevent
);
452 * Disable UST tracepoint of a channel from a UST session.
454 int event_ust_disable_tracepoint(struct ltt_ust_session
*usess
, int domain
,
455 struct ltt_ust_channel
*uchan
, char *event_name
)
458 struct ltt_ust_event
*uevent
;
460 uevent
= trace_ust_find_event_by_name(uchan
->events
, event_name
);
461 if (uevent
== NULL
) {
462 ret
= LTTCOMM_UST_EVENT_NOT_FOUND
;
466 if (uevent
->enabled
== 0) {
467 /* It's already enabled so everything is OK */
473 case LTTNG_DOMAIN_UST
:
474 ret
= ust_app_disable_event_glb(usess
, uchan
, uevent
);
475 if (ret
< 0 && ret
!= -EEXIST
) {
476 ret
= LTTCOMM_UST_DISABLE_FAIL
;
481 case LTTNG_DOMAIN_UST_EXEC_NAME
:
482 case LTTNG_DOMAIN_UST_PID
:
483 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
494 DBG2("Event UST %s disabled in channel %s", uevent
->attr
.name
,
502 * Disable all UST tracepoints for a channel from a UST session.
504 int event_ust_disable_all_tracepoints(struct ltt_ust_session
*usess
, int domain
,
505 struct ltt_ust_channel
*uchan
)
509 struct lttng_ht_iter iter
;
510 struct ltt_ust_event
*uevent
= NULL
;
511 struct lttng_event
*events
= NULL
;
514 case LTTNG_DOMAIN_UST
:
516 /* Disabling existing events */
517 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
,
519 if (uevent
->enabled
== 1) {
520 ret
= ust_app_disable_event_glb(usess
, uchan
, uevent
);
528 /* Get all UST available events */
529 size
= ust_app_list_events(&events
);
531 ret
= LTTCOMM_UST_LIST_FAIL
;
535 for (i
= 0; i
< size
; i
++) {
536 uevent
= trace_ust_find_event_by_name(uchan
->events
,
538 if (uevent
!= NULL
&& uevent
->enabled
== 1) {
539 ret
= ust_app_disable_event_pid(usess
, uchan
, uevent
,
541 if (ret
< 0 && ret
!= -EEXIST
) {
542 ret
= LTTCOMM_UST_DISABLE_FAIL
;
554 case LTTNG_DOMAIN_UST_EXEC_NAME
:
555 case LTTNG_DOMAIN_UST_PID
:
556 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
: