Commit | Line | Data |
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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 | ||
d87bfb32 | 18 | #include <errno.h> |
54d01ffb DG |
19 | #include <urcu/list.h> |
20 | ||
21 | #include <lttng/lttng.h> | |
22 | #include <lttng-sessiond-comm.h> | |
23 | #include <lttngerr.h> | |
24 | ||
25 | #include "channel.h" | |
26 | #include "event.h" | |
27 | #include "kernel-ctl.h" | |
28 | ||
8c9ae521 DG |
29 | /* |
30 | * Setup a lttng_event used to enable *all* syscall tracing. | |
31 | */ | |
32 | static void init_syscalls_kernel_event(struct lttng_event *event) | |
33 | { | |
34 | event->name[0] = '\0'; | |
35 | /* | |
36 | * We use LTTNG_EVENT* here since the trace kernel creation will make the | |
37 | * right changes for the kernel. | |
38 | */ | |
39 | event->type = LTTNG_EVENT_SYSCALL; | |
40 | } | |
41 | ||
54d01ffb | 42 | /* |
7a3d1328 | 43 | * Disable kernel tracepoint event for a channel from the kernel session. |
54d01ffb | 44 | */ |
7a3d1328 | 45 | int event_kernel_disable_tracepoint(struct ltt_kernel_session *ksession, |
54d01ffb DG |
46 | struct ltt_kernel_channel *kchan, char *event_name) |
47 | { | |
48 | int ret; | |
49 | struct ltt_kernel_event *kevent; | |
50 | ||
51 | kevent = trace_kernel_get_event_by_name(event_name, kchan); | |
52 | if (kevent == NULL) { | |
53 | ret = LTTCOMM_NO_EVENT; | |
54 | goto error; | |
55 | } | |
56 | ||
57 | ret = kernel_disable_event(kevent); | |
58 | if (ret < 0) { | |
59 | ret = LTTCOMM_KERN_DISABLE_FAIL; | |
60 | goto error; | |
61 | } | |
62 | ||
63 | DBG("Kernel event %s disable for channel %s.", | |
64 | kevent->event->name, kchan->channel->name); | |
65 | ||
66 | ret = LTTCOMM_OK; | |
67 | ||
68 | error: | |
69 | return ret; | |
70 | } | |
71 | ||
72 | /* | |
7a3d1328 | 73 | * Disable kernel tracepoint events for a channel from the kernel session. |
54d01ffb | 74 | */ |
7a3d1328 | 75 | int event_kernel_disable_all_tracepoints(struct ltt_kernel_session *ksession, |
54d01ffb DG |
76 | struct ltt_kernel_channel *kchan) |
77 | { | |
78 | int ret; | |
79 | struct ltt_kernel_event *kevent; | |
80 | ||
81 | /* For each event in the kernel session */ | |
82 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
83 | ret = kernel_disable_event(kevent); | |
84 | if (ret < 0) { | |
85 | /* We continue disabling the rest */ | |
86 | continue; | |
87 | } | |
88 | } | |
54d01ffb | 89 | ret = LTTCOMM_OK; |
7a3d1328 MD |
90 | return ret; |
91 | } | |
92 | ||
93 | /* | |
94 | * Disable kernel syscall events for a channel from the kernel session. | |
95 | */ | |
96 | int event_kernel_disable_all_syscalls(struct ltt_kernel_session *ksession, | |
97 | struct ltt_kernel_channel *kchan) | |
98 | { | |
99 | ERR("Cannot disable syscall tracing for existing session. Please destroy session instead."); | |
100 | return LTTCOMM_OK; /* Return OK so disable all succeeds */ | |
101 | } | |
54d01ffb | 102 | |
7a3d1328 MD |
103 | /* |
104 | * Disable all kernel event for a channel from the kernel session. | |
105 | */ | |
106 | int event_kernel_disable_all(struct ltt_kernel_session *ksession, | |
107 | struct ltt_kernel_channel *kchan) | |
108 | { | |
109 | int ret; | |
110 | ||
111 | ret = event_kernel_disable_all_tracepoints(ksession, kchan); | |
112 | if (ret != LTTCOMM_OK) | |
113 | return ret; | |
114 | ret = event_kernel_disable_all_syscalls(ksession, kchan); | |
54d01ffb DG |
115 | return ret; |
116 | } | |
117 | ||
118 | /* | |
7a3d1328 | 119 | * Enable kernel tracepoint event for a channel from the kernel session. |
54d01ffb | 120 | */ |
7a3d1328 | 121 | int event_kernel_enable_tracepoint(struct ltt_kernel_session *ksession, |
54d01ffb DG |
122 | struct ltt_kernel_channel *kchan, struct lttng_event *event) |
123 | { | |
124 | int ret; | |
125 | struct ltt_kernel_event *kevent; | |
126 | ||
127 | kevent = trace_kernel_get_event_by_name(event->name, kchan); | |
128 | if (kevent == NULL) { | |
129 | ret = kernel_create_event(event, kchan); | |
130 | if (ret < 0) { | |
d87bfb32 DG |
131 | if (ret == -EEXIST) { |
132 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
133 | } else { | |
134 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
135 | } | |
7a3d1328 | 136 | goto end; |
54d01ffb DG |
137 | } |
138 | } else if (kevent->enabled == 0) { | |
139 | ret = kernel_enable_event(kevent); | |
140 | if (ret < 0) { | |
141 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7a3d1328 | 142 | goto end; |
54d01ffb DG |
143 | } |
144 | } | |
54d01ffb | 145 | ret = LTTCOMM_OK; |
7a3d1328 | 146 | end: |
54d01ffb DG |
147 | return ret; |
148 | } | |
149 | ||
150 | /* | |
7a3d1328 | 151 | * Enable all kernel tracepoint events of a channel of the kernel session. |
54d01ffb | 152 | */ |
7a3d1328 | 153 | int event_kernel_enable_all_tracepoints(struct ltt_kernel_session *ksession, |
54d01ffb DG |
154 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
155 | { | |
156 | int size, i, ret; | |
157 | struct ltt_kernel_event *kevent; | |
158 | struct lttng_event *event_list; | |
159 | ||
160 | /* For each event in the kernel session */ | |
161 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
162 | ret = kernel_enable_event(kevent); | |
163 | if (ret < 0) { | |
164 | /* Enable failed but still continue */ | |
165 | continue; | |
166 | } | |
167 | } | |
168 | ||
169 | size = kernel_list_events(kernel_tracer_fd, &event_list); | |
170 | if (size < 0) { | |
171 | ret = LTTCOMM_KERN_LIST_FAIL; | |
7a3d1328 | 172 | goto end; |
54d01ffb DG |
173 | } |
174 | ||
175 | for (i = 0; i < size; i++) { | |
176 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); | |
177 | if (kevent == NULL) { | |
178 | /* Default event type for enable all */ | |
179 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
180 | /* Enable each single tracepoint event */ | |
181 | ret = kernel_create_event(&event_list[i], kchan); | |
182 | if (ret < 0) { | |
183 | /* Ignore error here and continue */ | |
184 | } | |
185 | } | |
186 | } | |
54d01ffb | 187 | free(event_list); |
54d01ffb | 188 | ret = LTTCOMM_OK; |
7a3d1328 | 189 | end: |
54d01ffb | 190 | return ret; |
7a3d1328 | 191 | |
54d01ffb | 192 | } |
8c9ae521 DG |
193 | |
194 | /* | |
7a3d1328 | 195 | * Enable all kernel tracepoint events of a channel of the kernel session. |
8c9ae521 | 196 | */ |
7a3d1328 | 197 | int event_kernel_enable_all_syscalls(struct ltt_kernel_session *ksession, |
8c9ae521 DG |
198 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
199 | { | |
200 | int ret; | |
201 | struct lttng_event event; | |
202 | ||
203 | init_syscalls_kernel_event(&event); | |
204 | ||
205 | DBG("Enabling all syscall tracing"); | |
206 | ||
207 | ret = kernel_create_event(&event, kchan); | |
208 | if (ret < 0) { | |
7a3d1328 | 209 | goto end; |
8c9ae521 | 210 | } |
8c9ae521 | 211 | ret = LTTCOMM_OK; |
7a3d1328 MD |
212 | end: |
213 | return ret; | |
214 | } | |
8c9ae521 | 215 | |
7a3d1328 MD |
216 | /* |
217 | * Enable all kernel events of a channel of the kernel session. | |
218 | */ | |
219 | int event_kernel_enable_all(struct ltt_kernel_session *ksession, | |
220 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) | |
221 | { | |
222 | int ret; | |
223 | ||
224 | ret = event_kernel_enable_all_tracepoints(ksession, kchan, kernel_tracer_fd); | |
225 | if (ret != LTTCOMM_OK) { | |
226 | goto end; | |
227 | } | |
228 | ret = event_kernel_enable_all_syscalls(ksession, kchan, kernel_tracer_fd); | |
229 | end: | |
8c9ae521 DG |
230 | return ret; |
231 | } |