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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 | ||
8c9ae521 DG |
28 | /* |
29 | * Setup a lttng_event used to enable *all* syscall tracing. | |
30 | */ | |
31 | static void init_syscalls_kernel_event(struct lttng_event *event) | |
32 | { | |
33 | event->name[0] = '\0'; | |
34 | /* | |
35 | * We use LTTNG_EVENT* here since the trace kernel creation will make the | |
36 | * right changes for the kernel. | |
37 | */ | |
38 | event->type = LTTNG_EVENT_SYSCALL; | |
39 | } | |
40 | ||
54d01ffb DG |
41 | /* |
42 | * Disable kernel event for a channel from the kernel session. | |
43 | */ | |
44 | int event_kernel_disable(struct ltt_kernel_session *ksession, | |
45 | struct ltt_kernel_channel *kchan, char *event_name) | |
46 | { | |
47 | int ret; | |
48 | struct ltt_kernel_event *kevent; | |
49 | ||
50 | kevent = trace_kernel_get_event_by_name(event_name, kchan); | |
51 | if (kevent == NULL) { | |
52 | ret = LTTCOMM_NO_EVENT; | |
53 | goto error; | |
54 | } | |
55 | ||
56 | ret = kernel_disable_event(kevent); | |
57 | if (ret < 0) { | |
58 | ret = LTTCOMM_KERN_DISABLE_FAIL; | |
59 | goto error; | |
60 | } | |
61 | ||
62 | DBG("Kernel event %s disable for channel %s.", | |
63 | kevent->event->name, kchan->channel->name); | |
64 | ||
65 | ret = LTTCOMM_OK; | |
66 | ||
67 | error: | |
68 | return ret; | |
69 | } | |
70 | ||
71 | /* | |
72 | * Disable all kernel event for a channel from the kernel session. | |
73 | */ | |
74 | int event_kernel_disable_all(struct ltt_kernel_session *ksession, | |
75 | struct ltt_kernel_channel *kchan) | |
76 | { | |
77 | int ret; | |
78 | struct ltt_kernel_event *kevent; | |
79 | ||
80 | /* For each event in the kernel session */ | |
81 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
82 | ret = kernel_disable_event(kevent); | |
83 | if (ret < 0) { | |
84 | /* We continue disabling the rest */ | |
85 | continue; | |
86 | } | |
87 | } | |
88 | ||
89 | ret = LTTCOMM_OK; | |
90 | ||
91 | return ret; | |
92 | } | |
93 | ||
94 | /* | |
95 | * Enable kernel event for a channel from the kernel session. | |
96 | */ | |
97 | int event_kernel_enable(struct ltt_kernel_session *ksession, | |
98 | struct ltt_kernel_channel *kchan, struct lttng_event *event) | |
99 | { | |
100 | int ret; | |
101 | struct ltt_kernel_event *kevent; | |
102 | ||
103 | kevent = trace_kernel_get_event_by_name(event->name, kchan); | |
104 | if (kevent == NULL) { | |
105 | ret = kernel_create_event(event, kchan); | |
106 | if (ret < 0) { | |
107 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
108 | goto error; | |
109 | } | |
110 | } else if (kevent->enabled == 0) { | |
111 | ret = kernel_enable_event(kevent); | |
112 | if (ret < 0) { | |
113 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
114 | goto error; | |
115 | } | |
116 | } | |
117 | ||
118 | ret = LTTCOMM_OK; | |
119 | ||
120 | error: | |
121 | return ret; | |
122 | } | |
123 | ||
124 | /* | |
125 | * Enable all kernel event of a channel of the kernel session. | |
126 | */ | |
127 | int event_kernel_enable_all(struct ltt_kernel_session *ksession, | |
128 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) | |
129 | { | |
130 | int size, i, ret; | |
131 | struct ltt_kernel_event *kevent; | |
132 | struct lttng_event *event_list; | |
133 | ||
134 | /* For each event in the kernel session */ | |
135 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
136 | ret = kernel_enable_event(kevent); | |
137 | if (ret < 0) { | |
138 | /* Enable failed but still continue */ | |
139 | continue; | |
140 | } | |
141 | } | |
142 | ||
143 | size = kernel_list_events(kernel_tracer_fd, &event_list); | |
144 | if (size < 0) { | |
145 | ret = LTTCOMM_KERN_LIST_FAIL; | |
146 | goto error; | |
147 | } | |
148 | ||
149 | for (i = 0; i < size; i++) { | |
150 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); | |
151 | if (kevent == NULL) { | |
152 | /* Default event type for enable all */ | |
153 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
154 | /* Enable each single tracepoint event */ | |
155 | ret = kernel_create_event(&event_list[i], kchan); | |
156 | if (ret < 0) { | |
157 | /* Ignore error here and continue */ | |
158 | } | |
159 | } | |
160 | } | |
161 | ||
162 | free(event_list); | |
163 | ||
164 | ret = LTTCOMM_OK; | |
165 | ||
166 | error: | |
167 | return ret; | |
168 | } | |
8c9ae521 DG |
169 | |
170 | /* | |
171 | * Enable all kernel syscalls tracing. | |
172 | */ | |
173 | int event_kernel_enable_syscalls(struct ltt_kernel_session *ksession, | |
174 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) | |
175 | { | |
176 | int ret; | |
177 | struct lttng_event event; | |
178 | ||
179 | init_syscalls_kernel_event(&event); | |
180 | ||
181 | DBG("Enabling all syscall tracing"); | |
182 | ||
183 | ret = kernel_create_event(&event, kchan); | |
184 | if (ret < 0) { | |
185 | goto error; | |
186 | } | |
187 | ||
188 | ret = LTTCOMM_OK; | |
189 | ||
190 | error: | |
191 | return ret; | |
192 | } |