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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 | 41 | /* |
7a3d1328 | 42 | * Disable kernel tracepoint event for a channel from the kernel session. |
54d01ffb | 43 | */ |
7a3d1328 | 44 | int event_kernel_disable_tracepoint(struct ltt_kernel_session *ksession, |
54d01ffb DG |
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 | /* | |
7a3d1328 | 72 | * Disable kernel tracepoint events for a channel from the kernel session. |
54d01ffb | 73 | */ |
7a3d1328 | 74 | int event_kernel_disable_all_tracepoints(struct ltt_kernel_session *ksession, |
54d01ffb DG |
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 | } | |
54d01ffb | 88 | ret = LTTCOMM_OK; |
7a3d1328 MD |
89 | return ret; |
90 | } | |
91 | ||
92 | /* | |
93 | * Disable kernel syscall events for a channel from the kernel session. | |
94 | */ | |
95 | int event_kernel_disable_all_syscalls(struct ltt_kernel_session *ksession, | |
96 | struct ltt_kernel_channel *kchan) | |
97 | { | |
98 | ERR("Cannot disable syscall tracing for existing session. Please destroy session instead."); | |
99 | return LTTCOMM_OK; /* Return OK so disable all succeeds */ | |
100 | } | |
54d01ffb | 101 | |
7a3d1328 MD |
102 | /* |
103 | * Disable all kernel event for a channel from the kernel session. | |
104 | */ | |
105 | int event_kernel_disable_all(struct ltt_kernel_session *ksession, | |
106 | struct ltt_kernel_channel *kchan) | |
107 | { | |
108 | int ret; | |
109 | ||
110 | ret = event_kernel_disable_all_tracepoints(ksession, kchan); | |
111 | if (ret != LTTCOMM_OK) | |
112 | return ret; | |
113 | ret = event_kernel_disable_all_syscalls(ksession, kchan); | |
54d01ffb DG |
114 | return ret; |
115 | } | |
116 | ||
117 | /* | |
7a3d1328 | 118 | * Enable kernel tracepoint event for a channel from the kernel session. |
54d01ffb | 119 | */ |
7a3d1328 | 120 | int event_kernel_enable_tracepoint(struct ltt_kernel_session *ksession, |
54d01ffb DG |
121 | struct ltt_kernel_channel *kchan, struct lttng_event *event) |
122 | { | |
123 | int ret; | |
124 | struct ltt_kernel_event *kevent; | |
125 | ||
126 | kevent = trace_kernel_get_event_by_name(event->name, kchan); | |
127 | if (kevent == NULL) { | |
128 | ret = kernel_create_event(event, kchan); | |
129 | if (ret < 0) { | |
130 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7a3d1328 | 131 | goto end; |
54d01ffb DG |
132 | } |
133 | } else if (kevent->enabled == 0) { | |
134 | ret = kernel_enable_event(kevent); | |
135 | if (ret < 0) { | |
136 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7a3d1328 | 137 | goto end; |
54d01ffb DG |
138 | } |
139 | } | |
54d01ffb | 140 | ret = LTTCOMM_OK; |
7a3d1328 | 141 | end: |
54d01ffb DG |
142 | return ret; |
143 | } | |
144 | ||
145 | /* | |
7a3d1328 | 146 | * Enable all kernel tracepoint events of a channel of the kernel session. |
54d01ffb | 147 | */ |
7a3d1328 | 148 | int event_kernel_enable_all_tracepoints(struct ltt_kernel_session *ksession, |
54d01ffb DG |
149 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
150 | { | |
151 | int size, i, ret; | |
152 | struct ltt_kernel_event *kevent; | |
153 | struct lttng_event *event_list; | |
154 | ||
155 | /* For each event in the kernel session */ | |
156 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
157 | ret = kernel_enable_event(kevent); | |
158 | if (ret < 0) { | |
159 | /* Enable failed but still continue */ | |
160 | continue; | |
161 | } | |
162 | } | |
163 | ||
164 | size = kernel_list_events(kernel_tracer_fd, &event_list); | |
165 | if (size < 0) { | |
166 | ret = LTTCOMM_KERN_LIST_FAIL; | |
7a3d1328 | 167 | goto end; |
54d01ffb DG |
168 | } |
169 | ||
170 | for (i = 0; i < size; i++) { | |
171 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); | |
172 | if (kevent == NULL) { | |
173 | /* Default event type for enable all */ | |
174 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
175 | /* Enable each single tracepoint event */ | |
176 | ret = kernel_create_event(&event_list[i], kchan); | |
177 | if (ret < 0) { | |
178 | /* Ignore error here and continue */ | |
179 | } | |
180 | } | |
181 | } | |
54d01ffb | 182 | free(event_list); |
54d01ffb | 183 | ret = LTTCOMM_OK; |
7a3d1328 | 184 | end: |
54d01ffb | 185 | return ret; |
7a3d1328 | 186 | |
54d01ffb | 187 | } |
8c9ae521 DG |
188 | |
189 | /* | |
7a3d1328 | 190 | * Enable all kernel tracepoint events of a channel of the kernel session. |
8c9ae521 | 191 | */ |
7a3d1328 | 192 | int event_kernel_enable_all_syscalls(struct ltt_kernel_session *ksession, |
8c9ae521 DG |
193 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
194 | { | |
195 | int ret; | |
196 | struct lttng_event event; | |
197 | ||
198 | init_syscalls_kernel_event(&event); | |
199 | ||
200 | DBG("Enabling all syscall tracing"); | |
201 | ||
202 | ret = kernel_create_event(&event, kchan); | |
203 | if (ret < 0) { | |
7a3d1328 | 204 | goto end; |
8c9ae521 | 205 | } |
8c9ae521 | 206 | ret = LTTCOMM_OK; |
7a3d1328 MD |
207 | end: |
208 | return ret; | |
209 | } | |
8c9ae521 | 210 | |
7a3d1328 MD |
211 | /* |
212 | * Enable all kernel events of a channel of the kernel session. | |
213 | */ | |
214 | int event_kernel_enable_all(struct ltt_kernel_session *ksession, | |
215 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) | |
216 | { | |
217 | int ret; | |
218 | ||
219 | ret = event_kernel_enable_all_tracepoints(ksession, kchan, kernel_tracer_fd); | |
220 | if (ret != LTTCOMM_OK) { | |
221 | goto end; | |
222 | } | |
223 | ret = event_kernel_enable_all_syscalls(ksession, kchan, kernel_tracer_fd); | |
224 | end: | |
8c9ae521 DG |
225 | return ret; |
226 | } |