2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the Free
6 * Software Foundation; only version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307, USA.
18 #include <urcu/list.h>
20 #include <lttng/lttng.h>
21 #include <lttng-sessiond-comm.h>
26 #include "kernel-ctl.h"
29 * Disable kernel event for a channel from the kernel session.
31 int event_kernel_disable(struct ltt_kernel_session
*ksession
,
32 struct ltt_kernel_channel
*kchan
, char *event_name
)
35 struct ltt_kernel_event
*kevent
;
37 kevent
= trace_kernel_get_event_by_name(event_name
, kchan
);
39 ret
= LTTCOMM_NO_EVENT
;
43 ret
= kernel_disable_event(kevent
);
45 ret
= LTTCOMM_KERN_DISABLE_FAIL
;
49 DBG("Kernel event %s disable for channel %s.",
50 kevent
->event
->name
, kchan
->channel
->name
);
59 * Disable all kernel event for a channel from the kernel session.
61 int event_kernel_disable_all(struct ltt_kernel_session
*ksession
,
62 struct ltt_kernel_channel
*kchan
)
65 struct ltt_kernel_event
*kevent
;
67 /* For each event in the kernel session */
68 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
69 ret
= kernel_disable_event(kevent
);
71 /* We continue disabling the rest */
82 * Enable kernel event for a channel from the kernel session.
84 int event_kernel_enable(struct ltt_kernel_session
*ksession
,
85 struct ltt_kernel_channel
*kchan
, struct lttng_event
*event
)
88 struct ltt_kernel_event
*kevent
;
90 kevent
= trace_kernel_get_event_by_name(event
->name
, kchan
);
92 ret
= kernel_create_event(event
, kchan
);
94 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
97 } else if (kevent
->enabled
== 0) {
98 ret
= kernel_enable_event(kevent
);
100 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
112 * Enable all kernel event of a channel of the kernel session.
114 int event_kernel_enable_all(struct ltt_kernel_session
*ksession
,
115 struct ltt_kernel_channel
*kchan
, int kernel_tracer_fd
)
118 struct ltt_kernel_event
*kevent
;
119 struct lttng_event
*event_list
;
121 /* For each event in the kernel session */
122 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
123 ret
= kernel_enable_event(kevent
);
125 /* Enable failed but still continue */
130 size
= kernel_list_events(kernel_tracer_fd
, &event_list
);
132 ret
= LTTCOMM_KERN_LIST_FAIL
;
136 for (i
= 0; i
< size
; i
++) {
137 kevent
= trace_kernel_get_event_by_name(event_list
[i
].name
, kchan
);
138 if (kevent
== NULL
) {
139 /* Default event type for enable all */
140 event_list
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
141 /* Enable each single tracepoint event */
142 ret
= kernel_create_event(&event_list
[i
], kchan
);
144 /* Ignore error here and continue */