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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 | 19 | #include <urcu/list.h> |
2bdd86d4 | 20 | #include <string.h> |
54d01ffb DG |
21 | |
22 | #include <lttng/lttng.h> | |
23 | #include <lttng-sessiond-comm.h> | |
24 | #include <lttngerr.h> | |
25 | ||
2bdd86d4 MD |
26 | #ifdef CONFIG_LTTNG_TOOLS_HAVE_UST |
27 | #include <ust/lttng-ust-ctl.h> | |
28 | #else | |
29 | #include "lttng-ust-ctl.h" | |
30 | #endif | |
31 | ||
54d01ffb DG |
32 | #include "channel.h" |
33 | #include "event.h" | |
48842b30 | 34 | #include "hashtable.h" |
54d01ffb DG |
35 | #include "kernel-ctl.h" |
36 | ||
8c9ae521 DG |
37 | /* |
38 | * Setup a lttng_event used to enable *all* syscall tracing. | |
39 | */ | |
40 | static void init_syscalls_kernel_event(struct lttng_event *event) | |
41 | { | |
42 | event->name[0] = '\0'; | |
43 | /* | |
44 | * We use LTTNG_EVENT* here since the trace kernel creation will make the | |
45 | * right changes for the kernel. | |
46 | */ | |
47 | event->type = LTTNG_EVENT_SYSCALL; | |
48 | } | |
49 | ||
54d01ffb | 50 | /* |
7a3d1328 | 51 | * Disable kernel tracepoint event for a channel from the kernel session. |
54d01ffb | 52 | */ |
7a3d1328 | 53 | int event_kernel_disable_tracepoint(struct ltt_kernel_session *ksession, |
54d01ffb DG |
54 | struct ltt_kernel_channel *kchan, char *event_name) |
55 | { | |
56 | int ret; | |
57 | struct ltt_kernel_event *kevent; | |
58 | ||
59 | kevent = trace_kernel_get_event_by_name(event_name, kchan); | |
60 | if (kevent == NULL) { | |
61 | ret = LTTCOMM_NO_EVENT; | |
62 | goto error; | |
63 | } | |
64 | ||
65 | ret = kernel_disable_event(kevent); | |
66 | if (ret < 0) { | |
67 | ret = LTTCOMM_KERN_DISABLE_FAIL; | |
68 | goto error; | |
69 | } | |
70 | ||
71 | DBG("Kernel event %s disable for channel %s.", | |
72 | kevent->event->name, kchan->channel->name); | |
73 | ||
74 | ret = LTTCOMM_OK; | |
75 | ||
76 | error: | |
77 | return ret; | |
78 | } | |
79 | ||
80 | /* | |
7a3d1328 | 81 | * Disable kernel tracepoint events for a channel from the kernel session. |
54d01ffb | 82 | */ |
7a3d1328 | 83 | int event_kernel_disable_all_tracepoints(struct ltt_kernel_session *ksession, |
54d01ffb DG |
84 | struct ltt_kernel_channel *kchan) |
85 | { | |
86 | int ret; | |
87 | struct ltt_kernel_event *kevent; | |
88 | ||
89 | /* For each event in the kernel session */ | |
90 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
91 | ret = kernel_disable_event(kevent); | |
92 | if (ret < 0) { | |
93 | /* We continue disabling the rest */ | |
94 | continue; | |
95 | } | |
96 | } | |
54d01ffb | 97 | ret = LTTCOMM_OK; |
7a3d1328 MD |
98 | return ret; |
99 | } | |
100 | ||
101 | /* | |
102 | * Disable kernel syscall events for a channel from the kernel session. | |
103 | */ | |
104 | int event_kernel_disable_all_syscalls(struct ltt_kernel_session *ksession, | |
105 | struct ltt_kernel_channel *kchan) | |
106 | { | |
107 | ERR("Cannot disable syscall tracing for existing session. Please destroy session instead."); | |
108 | return LTTCOMM_OK; /* Return OK so disable all succeeds */ | |
109 | } | |
54d01ffb | 110 | |
7a3d1328 MD |
111 | /* |
112 | * Disable all kernel event for a channel from the kernel session. | |
113 | */ | |
114 | int event_kernel_disable_all(struct ltt_kernel_session *ksession, | |
115 | struct ltt_kernel_channel *kchan) | |
116 | { | |
117 | int ret; | |
118 | ||
119 | ret = event_kernel_disable_all_tracepoints(ksession, kchan); | |
120 | if (ret != LTTCOMM_OK) | |
121 | return ret; | |
122 | ret = event_kernel_disable_all_syscalls(ksession, kchan); | |
54d01ffb DG |
123 | return ret; |
124 | } | |
125 | ||
126 | /* | |
7a3d1328 | 127 | * Enable kernel tracepoint event for a channel from the kernel session. |
54d01ffb | 128 | */ |
7a3d1328 | 129 | int event_kernel_enable_tracepoint(struct ltt_kernel_session *ksession, |
54d01ffb DG |
130 | struct ltt_kernel_channel *kchan, struct lttng_event *event) |
131 | { | |
132 | int ret; | |
133 | struct ltt_kernel_event *kevent; | |
134 | ||
135 | kevent = trace_kernel_get_event_by_name(event->name, kchan); | |
136 | if (kevent == NULL) { | |
137 | ret = kernel_create_event(event, kchan); | |
138 | if (ret < 0) { | |
d87bfb32 DG |
139 | if (ret == -EEXIST) { |
140 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
141 | } else { | |
142 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
143 | } | |
7a3d1328 | 144 | goto end; |
54d01ffb DG |
145 | } |
146 | } else if (kevent->enabled == 0) { | |
147 | ret = kernel_enable_event(kevent); | |
148 | if (ret < 0) { | |
149 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7a3d1328 | 150 | goto end; |
54d01ffb DG |
151 | } |
152 | } | |
54d01ffb | 153 | ret = LTTCOMM_OK; |
7a3d1328 | 154 | end: |
54d01ffb DG |
155 | return ret; |
156 | } | |
157 | ||
158 | /* | |
7a3d1328 | 159 | * Enable all kernel tracepoint events of a channel of the kernel session. |
54d01ffb | 160 | */ |
7a3d1328 | 161 | int event_kernel_enable_all_tracepoints(struct ltt_kernel_session *ksession, |
54d01ffb DG |
162 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
163 | { | |
164 | int size, i, ret; | |
165 | struct ltt_kernel_event *kevent; | |
166 | struct lttng_event *event_list; | |
167 | ||
168 | /* For each event in the kernel session */ | |
169 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
170 | ret = kernel_enable_event(kevent); | |
171 | if (ret < 0) { | |
172 | /* Enable failed but still continue */ | |
173 | continue; | |
174 | } | |
175 | } | |
176 | ||
177 | size = kernel_list_events(kernel_tracer_fd, &event_list); | |
178 | if (size < 0) { | |
179 | ret = LTTCOMM_KERN_LIST_FAIL; | |
7a3d1328 | 180 | goto end; |
54d01ffb DG |
181 | } |
182 | ||
183 | for (i = 0; i < size; i++) { | |
184 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); | |
185 | if (kevent == NULL) { | |
186 | /* Default event type for enable all */ | |
187 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
188 | /* Enable each single tracepoint event */ | |
189 | ret = kernel_create_event(&event_list[i], kchan); | |
190 | if (ret < 0) { | |
191 | /* Ignore error here and continue */ | |
192 | } | |
193 | } | |
194 | } | |
54d01ffb | 195 | free(event_list); |
54d01ffb | 196 | ret = LTTCOMM_OK; |
7a3d1328 | 197 | end: |
54d01ffb | 198 | return ret; |
7a3d1328 | 199 | |
54d01ffb | 200 | } |
8c9ae521 DG |
201 | |
202 | /* | |
7a3d1328 | 203 | * Enable all kernel tracepoint events of a channel of the kernel session. |
8c9ae521 | 204 | */ |
7a3d1328 | 205 | int event_kernel_enable_all_syscalls(struct ltt_kernel_session *ksession, |
8c9ae521 DG |
206 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
207 | { | |
208 | int ret; | |
209 | struct lttng_event event; | |
210 | ||
211 | init_syscalls_kernel_event(&event); | |
212 | ||
213 | DBG("Enabling all syscall tracing"); | |
214 | ||
215 | ret = kernel_create_event(&event, kchan); | |
216 | if (ret < 0) { | |
7a3d1328 | 217 | goto end; |
8c9ae521 | 218 | } |
8c9ae521 | 219 | ret = LTTCOMM_OK; |
7a3d1328 MD |
220 | end: |
221 | return ret; | |
222 | } | |
8c9ae521 | 223 | |
7a3d1328 MD |
224 | /* |
225 | * Enable all kernel events of a channel of the kernel session. | |
226 | */ | |
227 | int event_kernel_enable_all(struct ltt_kernel_session *ksession, | |
228 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) | |
229 | { | |
230 | int ret; | |
231 | ||
232 | ret = event_kernel_enable_all_tracepoints(ksession, kchan, kernel_tracer_fd); | |
233 | if (ret != LTTCOMM_OK) { | |
234 | goto end; | |
235 | } | |
236 | ret = event_kernel_enable_all_syscalls(ksession, kchan, kernel_tracer_fd); | |
237 | end: | |
8c9ae521 DG |
238 | return ret; |
239 | } | |
2bdd86d4 MD |
240 | |
241 | /* | |
242 | * Enable UST tracepoint event for a channel from a UST session. | |
243 | */ | |
48842b30 DG |
244 | #ifdef DISABLE |
245 | int event_ust_enable_tracepoint(struct ltt_ust_session *usess, | |
246 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
2bdd86d4 MD |
247 | { |
248 | int ret; | |
48842b30 DG |
249 | struct lttng_ust_event ltt_uevent; |
250 | struct object_data *obj_event; | |
2bdd86d4 | 251 | |
48842b30 DG |
252 | strncpy(ltt_uevent.name, uevent->attr.name, sizeof(ltt_uevent.name)); |
253 | ltt_uevent.name[sizeof(ltt_uevent.name) - 1] = '\0'; | |
254 | /* TODO: adjust to other instrumentation types */ | |
255 | ltt_uevent.instrumentation = LTTNG_UST_TRACEPOINT; | |
256 | ||
257 | ret = ustctl_create_event(app->key.sock, <t_uevent, | |
258 | uchan->obj, &obj_event); | |
259 | if (ret < 0) { | |
260 | DBG("Error ustctl create event %s for app pid: %d, sock: %d ret %d", | |
261 | uevent->attr.name, app->key.pid, app->key.sock, ret); | |
262 | goto next; | |
2bdd86d4 | 263 | } |
48842b30 DG |
264 | |
265 | uevent->obj = obj_event; | |
266 | uevent->handle = obj_event->handle; | |
267 | uevent->enabled = 1; | |
2bdd86d4 MD |
268 | ret = LTTCOMM_OK; |
269 | end: | |
270 | return ret; | |
271 | } | |
48842b30 | 272 | #endif |
2bdd86d4 | 273 | |
48842b30 | 274 | #ifdef DISABLE |
2bdd86d4 MD |
275 | int event_ust_disable_tracepoint(struct ltt_ust_session *ustsession, |
276 | struct ltt_ust_channel *ustchan, char *event_name) | |
277 | { | |
278 | int ret; | |
279 | struct ltt_ust_event *ustevent; | |
280 | ||
48842b30 | 281 | ustevent = trace_ust_find_event_by_name(ustchan->events, event_name); |
2bdd86d4 MD |
282 | if (ustevent == NULL) { |
283 | ret = LTTCOMM_NO_EVENT; | |
284 | goto end; | |
285 | } | |
48842b30 | 286 | //ret = ustctl_disable(ustsession->sock, ustevent->obj); |
2bdd86d4 MD |
287 | if (ret < 0) { |
288 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
289 | goto end; | |
290 | } | |
291 | ustevent->enabled = 0; | |
292 | ret = LTTCOMM_OK; | |
293 | end: | |
294 | return ret; | |
295 | } | |
48842b30 | 296 | #endif |