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54d01ffb DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
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. | |
7 | * | |
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 | |
11 | * more details. | |
12 | * | |
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. | |
16 | */ | |
17 | ||
18 | #include <urcu/list.h> | |
19 | ||
20 | #include <lttng/lttng.h> | |
21 | #include <lttng-sessiond-comm.h> | |
22 | #include <lttngerr.h> | |
23 | ||
24 | #include "channel.h" | |
25 | #include "event.h" | |
26 | #include "kernel-ctl.h" | |
27 | ||
28 | /* | |
29 | * Disable kernel event for a channel from the kernel session. | |
30 | */ | |
31 | int event_kernel_disable(struct ltt_kernel_session *ksession, | |
32 | struct ltt_kernel_channel *kchan, char *event_name) | |
33 | { | |
34 | int ret; | |
35 | struct ltt_kernel_event *kevent; | |
36 | ||
37 | kevent = trace_kernel_get_event_by_name(event_name, kchan); | |
38 | if (kevent == NULL) { | |
39 | ret = LTTCOMM_NO_EVENT; | |
40 | goto error; | |
41 | } | |
42 | ||
43 | ret = kernel_disable_event(kevent); | |
44 | if (ret < 0) { | |
45 | ret = LTTCOMM_KERN_DISABLE_FAIL; | |
46 | goto error; | |
47 | } | |
48 | ||
49 | DBG("Kernel event %s disable for channel %s.", | |
50 | kevent->event->name, kchan->channel->name); | |
51 | ||
52 | ret = LTTCOMM_OK; | |
53 | ||
54 | error: | |
55 | return ret; | |
56 | } | |
57 | ||
58 | /* | |
59 | * Disable all kernel event for a channel from the kernel session. | |
60 | */ | |
61 | int event_kernel_disable_all(struct ltt_kernel_session *ksession, | |
62 | struct ltt_kernel_channel *kchan) | |
63 | { | |
64 | int ret; | |
65 | struct ltt_kernel_event *kevent; | |
66 | ||
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); | |
70 | if (ret < 0) { | |
71 | /* We continue disabling the rest */ | |
72 | continue; | |
73 | } | |
74 | } | |
75 | ||
76 | ret = LTTCOMM_OK; | |
77 | ||
78 | return ret; | |
79 | } | |
80 | ||
81 | /* | |
82 | * Enable kernel event for a channel from the kernel session. | |
83 | */ | |
84 | int event_kernel_enable(struct ltt_kernel_session *ksession, | |
85 | struct ltt_kernel_channel *kchan, struct lttng_event *event) | |
86 | { | |
87 | int ret; | |
88 | struct ltt_kernel_event *kevent; | |
89 | ||
90 | kevent = trace_kernel_get_event_by_name(event->name, kchan); | |
91 | if (kevent == NULL) { | |
92 | ret = kernel_create_event(event, kchan); | |
93 | if (ret < 0) { | |
94 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
95 | goto error; | |
96 | } | |
97 | } else if (kevent->enabled == 0) { | |
98 | ret = kernel_enable_event(kevent); | |
99 | if (ret < 0) { | |
100 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
101 | goto error; | |
102 | } | |
103 | } | |
104 | ||
105 | ret = LTTCOMM_OK; | |
106 | ||
107 | error: | |
108 | return ret; | |
109 | } | |
110 | ||
111 | /* | |
112 | * Enable all kernel event of a channel of the kernel session. | |
113 | */ | |
114 | int event_kernel_enable_all(struct ltt_kernel_session *ksession, | |
115 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) | |
116 | { | |
117 | int size, i, ret; | |
118 | struct ltt_kernel_event *kevent; | |
119 | struct lttng_event *event_list; | |
120 | ||
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); | |
124 | if (ret < 0) { | |
125 | /* Enable failed but still continue */ | |
126 | continue; | |
127 | } | |
128 | } | |
129 | ||
130 | size = kernel_list_events(kernel_tracer_fd, &event_list); | |
131 | if (size < 0) { | |
132 | ret = LTTCOMM_KERN_LIST_FAIL; | |
133 | goto error; | |
134 | } | |
135 | ||
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); | |
143 | if (ret < 0) { | |
144 | /* Ignore error here and continue */ | |
145 | } | |
146 | } | |
147 | } | |
148 | ||
149 | free(event_list); | |
150 | ||
151 | ret = LTTCOMM_OK; | |
152 | ||
153 | error: | |
154 | return ret; | |
155 | } |