Commit | Line | Data |
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54d01ffb DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
54d01ffb | 7 | * |
d14d33bf AM |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
54d01ffb | 12 | * |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
54d01ffb DG |
16 | */ |
17 | ||
be040666 | 18 | #define _GNU_SOURCE |
d87bfb32 | 19 | #include <errno.h> |
54d01ffb | 20 | #include <urcu/list.h> |
2bdd86d4 | 21 | #include <string.h> |
54d01ffb DG |
22 | |
23 | #include <lttng/lttng.h> | |
db758600 | 24 | #include <common/error.h> |
10a8a223 | 25 | #include <common/sessiond-comm/sessiond-comm.h> |
54d01ffb DG |
26 | |
27 | #include "channel.h" | |
28 | #include "event.h" | |
4771f025 | 29 | #include "kernel.h" |
9df8df5e | 30 | #include "ust-ctl.h" |
edb67388 DG |
31 | #include "ust-app.h" |
32 | #include "trace-kernel.h" | |
33 | #include "trace-ust.h" | |
54d01ffb | 34 | |
025faf73 DG |
35 | /* |
36 | * Add unique UST event based on the event name, filter bytecode and loglevel. | |
37 | */ | |
18eace3b DG |
38 | static void add_unique_ust_event(struct lttng_ht *ht, |
39 | struct ltt_ust_event *event) | |
40 | { | |
41 | struct cds_lfht_node *node_ptr; | |
42 | struct ltt_ust_ht_key key; | |
43 | ||
44 | assert(ht); | |
45 | assert(ht->ht); | |
46 | assert(event); | |
47 | ||
48 | key.name = event->attr.name; | |
49 | key.filter = (struct lttng_filter_bytecode *) event->filter; | |
50 | key.loglevel = event->attr.loglevel; | |
51 | ||
52 | node_ptr = cds_lfht_add_unique(ht->ht, | |
53 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
54 | trace_ust_ht_match_event, &key, &event->node.node); | |
55 | assert(node_ptr == &event->node.node); | |
56 | } | |
57 | ||
8c9ae521 DG |
58 | /* |
59 | * Setup a lttng_event used to enable *all* syscall tracing. | |
60 | */ | |
61 | static void init_syscalls_kernel_event(struct lttng_event *event) | |
62 | { | |
0525e9ae DG |
63 | assert(event); |
64 | ||
8c9ae521 DG |
65 | event->name[0] = '\0'; |
66 | /* | |
67 | * We use LTTNG_EVENT* here since the trace kernel creation will make the | |
68 | * right changes for the kernel. | |
69 | */ | |
70 | event->type = LTTNG_EVENT_SYSCALL; | |
71 | } | |
72 | ||
54d01ffb | 73 | /* |
7a3d1328 | 74 | * Disable kernel tracepoint event for a channel from the kernel session. |
54d01ffb | 75 | */ |
7a3d1328 | 76 | int event_kernel_disable_tracepoint(struct ltt_kernel_session *ksession, |
54d01ffb DG |
77 | struct ltt_kernel_channel *kchan, char *event_name) |
78 | { | |
79 | int ret; | |
80 | struct ltt_kernel_event *kevent; | |
81 | ||
0525e9ae DG |
82 | assert(kchan); |
83 | ||
54d01ffb DG |
84 | kevent = trace_kernel_get_event_by_name(event_name, kchan); |
85 | if (kevent == NULL) { | |
f73fabfd | 86 | ret = LTTNG_ERR_NO_EVENT; |
54d01ffb DG |
87 | goto error; |
88 | } | |
89 | ||
90 | ret = kernel_disable_event(kevent); | |
91 | if (ret < 0) { | |
f73fabfd | 92 | ret = LTTNG_ERR_KERN_DISABLE_FAIL; |
54d01ffb DG |
93 | goto error; |
94 | } | |
95 | ||
96 | DBG("Kernel event %s disable for channel %s.", | |
97 | kevent->event->name, kchan->channel->name); | |
98 | ||
f73fabfd | 99 | ret = LTTNG_OK; |
54d01ffb DG |
100 | |
101 | error: | |
102 | return ret; | |
103 | } | |
104 | ||
105 | /* | |
7a3d1328 | 106 | * Disable kernel tracepoint events for a channel from the kernel session. |
54d01ffb | 107 | */ |
7a3d1328 | 108 | int event_kernel_disable_all_tracepoints(struct ltt_kernel_session *ksession, |
54d01ffb DG |
109 | struct ltt_kernel_channel *kchan) |
110 | { | |
111 | int ret; | |
112 | struct ltt_kernel_event *kevent; | |
113 | ||
0525e9ae DG |
114 | assert(kchan); |
115 | ||
54d01ffb DG |
116 | /* For each event in the kernel session */ |
117 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
118 | ret = kernel_disable_event(kevent); | |
119 | if (ret < 0) { | |
120 | /* We continue disabling the rest */ | |
121 | continue; | |
122 | } | |
123 | } | |
f73fabfd | 124 | ret = LTTNG_OK; |
7a3d1328 MD |
125 | return ret; |
126 | } | |
127 | ||
128 | /* | |
129 | * Disable kernel syscall events for a channel from the kernel session. | |
130 | */ | |
131 | int event_kernel_disable_all_syscalls(struct ltt_kernel_session *ksession, | |
132 | struct ltt_kernel_channel *kchan) | |
133 | { | |
134 | ERR("Cannot disable syscall tracing for existing session. Please destroy session instead."); | |
f73fabfd | 135 | return LTTNG_OK; /* Return OK so disable all succeeds */ |
7a3d1328 | 136 | } |
54d01ffb | 137 | |
7a3d1328 MD |
138 | /* |
139 | * Disable all kernel event for a channel from the kernel session. | |
140 | */ | |
141 | int event_kernel_disable_all(struct ltt_kernel_session *ksession, | |
142 | struct ltt_kernel_channel *kchan) | |
143 | { | |
144 | int ret; | |
145 | ||
0525e9ae DG |
146 | assert(ksession); |
147 | assert(kchan); | |
148 | ||
7a3d1328 | 149 | ret = event_kernel_disable_all_tracepoints(ksession, kchan); |
f73fabfd | 150 | if (ret != LTTNG_OK) |
7a3d1328 MD |
151 | return ret; |
152 | ret = event_kernel_disable_all_syscalls(ksession, kchan); | |
54d01ffb DG |
153 | return ret; |
154 | } | |
155 | ||
156 | /* | |
7a3d1328 | 157 | * Enable kernel tracepoint event for a channel from the kernel session. |
54d01ffb | 158 | */ |
7a3d1328 | 159 | int event_kernel_enable_tracepoint(struct ltt_kernel_session *ksession, |
54d01ffb DG |
160 | struct ltt_kernel_channel *kchan, struct lttng_event *event) |
161 | { | |
162 | int ret; | |
163 | struct ltt_kernel_event *kevent; | |
164 | ||
0525e9ae DG |
165 | assert(kchan); |
166 | assert(event); | |
167 | ||
54d01ffb DG |
168 | kevent = trace_kernel_get_event_by_name(event->name, kchan); |
169 | if (kevent == NULL) { | |
170 | ret = kernel_create_event(event, kchan); | |
171 | if (ret < 0) { | |
bd29c13d DG |
172 | switch (-ret) { |
173 | case EEXIST: | |
f73fabfd | 174 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
bd29c13d DG |
175 | break; |
176 | case ENOSYS: | |
f73fabfd | 177 | ret = LTTNG_ERR_KERN_EVENT_ENOSYS; |
bd29c13d DG |
178 | break; |
179 | default: | |
f73fabfd | 180 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
bd29c13d | 181 | break; |
d87bfb32 | 182 | } |
7a3d1328 | 183 | goto end; |
54d01ffb DG |
184 | } |
185 | } else if (kevent->enabled == 0) { | |
186 | ret = kernel_enable_event(kevent); | |
187 | if (ret < 0) { | |
f73fabfd | 188 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
7a3d1328 | 189 | goto end; |
54d01ffb | 190 | } |
42224349 DG |
191 | } else { |
192 | /* At this point, the event is considered enabled */ | |
f73fabfd | 193 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 | 194 | goto end; |
54d01ffb | 195 | } |
42224349 | 196 | |
f73fabfd | 197 | ret = LTTNG_OK; |
7a3d1328 | 198 | end: |
54d01ffb DG |
199 | return ret; |
200 | } | |
201 | ||
202 | /* | |
7a3d1328 | 203 | * Enable all kernel tracepoint events of a channel of the kernel session. |
54d01ffb | 204 | */ |
7a3d1328 | 205 | int event_kernel_enable_all_tracepoints(struct ltt_kernel_session *ksession, |
54d01ffb DG |
206 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
207 | { | |
208 | int size, i, ret; | |
209 | struct ltt_kernel_event *kevent; | |
8f69e5eb | 210 | struct lttng_event *event_list = NULL; |
54d01ffb | 211 | |
0525e9ae DG |
212 | assert(kchan); |
213 | ||
54d01ffb DG |
214 | /* For each event in the kernel session */ |
215 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
8f69e5eb DG |
216 | if (kevent->enabled == 0) { |
217 | ret = kernel_enable_event(kevent); | |
218 | if (ret < 0) { | |
219 | /* Enable failed but still continue */ | |
220 | continue; | |
221 | } | |
54d01ffb DG |
222 | } |
223 | } | |
224 | ||
225 | size = kernel_list_events(kernel_tracer_fd, &event_list); | |
226 | if (size < 0) { | |
f73fabfd | 227 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
7a3d1328 | 228 | goto end; |
54d01ffb DG |
229 | } |
230 | ||
231 | for (i = 0; i < size; i++) { | |
232 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); | |
233 | if (kevent == NULL) { | |
234 | /* Default event type for enable all */ | |
235 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
236 | /* Enable each single tracepoint event */ | |
237 | ret = kernel_create_event(&event_list[i], kchan); | |
238 | if (ret < 0) { | |
239 | /* Ignore error here and continue */ | |
240 | } | |
241 | } | |
242 | } | |
54d01ffb | 243 | free(event_list); |
8f69e5eb | 244 | |
f73fabfd | 245 | ret = LTTNG_OK; |
7a3d1328 | 246 | end: |
54d01ffb DG |
247 | return ret; |
248 | } | |
8c9ae521 DG |
249 | |
250 | /* | |
7a3d1328 | 251 | * Enable all kernel tracepoint events of a channel of the kernel session. |
8c9ae521 | 252 | */ |
7a3d1328 | 253 | int event_kernel_enable_all_syscalls(struct ltt_kernel_session *ksession, |
8c9ae521 DG |
254 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
255 | { | |
256 | int ret; | |
257 | struct lttng_event event; | |
258 | ||
0525e9ae DG |
259 | assert(kchan); |
260 | ||
8c9ae521 DG |
261 | init_syscalls_kernel_event(&event); |
262 | ||
263 | DBG("Enabling all syscall tracing"); | |
264 | ||
265 | ret = kernel_create_event(&event, kchan); | |
266 | if (ret < 0) { | |
8f69e5eb | 267 | if (ret == -EEXIST) { |
f73fabfd | 268 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
8f69e5eb | 269 | } else { |
f73fabfd | 270 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
8f69e5eb | 271 | } |
7a3d1328 | 272 | goto end; |
8c9ae521 | 273 | } |
8f69e5eb | 274 | |
f73fabfd | 275 | ret = LTTNG_OK; |
7a3d1328 MD |
276 | end: |
277 | return ret; | |
278 | } | |
8c9ae521 | 279 | |
7a3d1328 MD |
280 | /* |
281 | * Enable all kernel events of a channel of the kernel session. | |
282 | */ | |
283 | int event_kernel_enable_all(struct ltt_kernel_session *ksession, | |
284 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) | |
285 | { | |
6bd8707a | 286 | int tp_ret; |
7a3d1328 | 287 | |
0525e9ae DG |
288 | assert(ksession); |
289 | assert(kchan); | |
290 | ||
291 | tp_ret = event_kernel_enable_all_tracepoints(ksession, kchan, | |
292 | kernel_tracer_fd); | |
f73fabfd | 293 | if (tp_ret != LTTNG_OK) { |
7a3d1328 MD |
294 | goto end; |
295 | } | |
bd29c13d DG |
296 | |
297 | /* | |
298 | * Reaching this code path means that all tracepoints were enabled without | |
299 | * errors so we ignore the error value of syscalls. | |
300 | * | |
301 | * At the moment, failing to enable syscalls on "lttng enable-event -a -k" | |
302 | * is not considered an error that need to be returned to the client since | |
303 | * tracepoints did not fail. Future work will allow us to send back | |
304 | * multiple errors to the client in one API call. | |
305 | */ | |
6bd8707a | 306 | (void) event_kernel_enable_all_syscalls(ksession, kchan, kernel_tracer_fd); |
bd29c13d | 307 | |
7a3d1328 | 308 | end: |
bd29c13d | 309 | return tp_ret; |
8c9ae521 | 310 | } |
2bdd86d4 | 311 | |
7f79d3a1 DG |
312 | /* |
313 | * ============================ | |
314 | * UST : The Ultimate Frontier! | |
315 | * ============================ | |
316 | */ | |
317 | ||
76d45b40 DG |
318 | /* |
319 | * Enable all UST tracepoints for a channel from a UST session. | |
320 | */ | |
321 | int event_ust_enable_all_tracepoints(struct ltt_ust_session *usess, int domain, | |
025faf73 | 322 | struct ltt_ust_channel *uchan, struct lttng_filter_bytecode *filter) |
76d45b40 | 323 | { |
6775595e | 324 | int ret, i, size; |
bec39940 | 325 | struct lttng_ht_iter iter; |
76d45b40 | 326 | struct ltt_ust_event *uevent = NULL; |
7f79d3a1 | 327 | struct lttng_event *events = NULL; |
76d45b40 | 328 | |
0525e9ae DG |
329 | assert(usess); |
330 | assert(uchan); | |
331 | ||
025faf73 DG |
332 | rcu_read_lock(); |
333 | ||
76d45b40 DG |
334 | switch (domain) { |
335 | case LTTNG_DOMAIN_UST: | |
336 | { | |
337 | /* Enable existing events */ | |
bec39940 DG |
338 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, |
339 | node.node) { | |
76d45b40 DG |
340 | if (uevent->enabled == 0) { |
341 | ret = ust_app_enable_event_glb(usess, uchan, uevent); | |
342 | if (ret < 0) { | |
343 | continue; | |
344 | } | |
345 | uevent->enabled = 1; | |
346 | } | |
347 | } | |
348 | ||
349 | /* Get all UST available events */ | |
350 | size = ust_app_list_events(&events); | |
351 | if (size < 0) { | |
f73fabfd | 352 | ret = LTTNG_ERR_UST_LIST_FAIL; |
76d45b40 DG |
353 | goto error; |
354 | } | |
355 | ||
356 | for (i = 0; i < size; i++) { | |
357 | /* | |
358 | * Check if event exist and if so, continue since it was enable | |
359 | * previously. | |
360 | */ | |
025faf73 | 361 | uevent = trace_ust_find_event(uchan->events, events[i].name, filter, |
18eace3b | 362 | events[i].loglevel); |
76d45b40 DG |
363 | if (uevent != NULL) { |
364 | ret = ust_app_enable_event_pid(usess, uchan, uevent, | |
365 | events[i].pid); | |
366 | if (ret < 0) { | |
49c336c1 | 367 | if (ret != -LTTNG_UST_ERR_EXIST) { |
f73fabfd | 368 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
76d45b40 DG |
369 | goto error; |
370 | } | |
371 | } | |
372 | continue; | |
373 | } | |
374 | ||
375 | /* Create ust event */ | |
025faf73 | 376 | uevent = trace_ust_create_event(&events[i], filter); |
76d45b40 | 377 | if (uevent == NULL) { |
f73fabfd | 378 | ret = LTTNG_ERR_FATAL; |
7f79d3a1 | 379 | goto error_destroy; |
76d45b40 DG |
380 | } |
381 | ||
382 | /* Create event for the specific PID */ | |
383 | ret = ust_app_enable_event_pid(usess, uchan, uevent, | |
384 | events[i].pid); | |
385 | if (ret < 0) { | |
49c336c1 | 386 | if (ret == -LTTNG_UST_ERR_EXIST) { |
f73fabfd | 387 | ret = LTTNG_ERR_UST_EVENT_EXIST; |
7f79d3a1 | 388 | goto error; |
76d45b40 | 389 | } else { |
f73fabfd | 390 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
7f79d3a1 | 391 | goto error_destroy; |
76d45b40 | 392 | } |
76d45b40 DG |
393 | } |
394 | ||
395 | uevent->enabled = 1; | |
396 | /* Add ltt ust event to channel */ | |
397 | rcu_read_lock(); | |
18eace3b | 398 | add_unique_ust_event(uchan->events, uevent); |
76d45b40 DG |
399 | rcu_read_unlock(); |
400 | } | |
401 | ||
402 | free(events); | |
403 | break; | |
404 | } | |
d78d6610 | 405 | #if 0 |
76d45b40 DG |
406 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
407 | case LTTNG_DOMAIN_UST_PID: | |
408 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 409 | #endif |
76d45b40 | 410 | default: |
f73fabfd | 411 | ret = LTTNG_ERR_UND; |
76d45b40 DG |
412 | goto error; |
413 | } | |
414 | ||
025faf73 | 415 | rcu_read_unlock(); |
f73fabfd | 416 | return LTTNG_OK; |
76d45b40 | 417 | |
7f79d3a1 | 418 | error_destroy: |
76d45b40 | 419 | trace_ust_destroy_event(uevent); |
7f79d3a1 DG |
420 | |
421 | error: | |
422 | free(events); | |
025faf73 | 423 | rcu_read_unlock(); |
76d45b40 DG |
424 | return ret; |
425 | } | |
426 | ||
2bdd86d4 MD |
427 | /* |
428 | * Enable UST tracepoint event for a channel from a UST session. | |
429 | */ | |
edb67388 | 430 | int event_ust_enable_tracepoint(struct ltt_ust_session *usess, int domain, |
025faf73 DG |
431 | struct ltt_ust_channel *uchan, struct lttng_event *event, |
432 | struct lttng_filter_bytecode *filter) | |
2bdd86d4 | 433 | { |
f73fabfd | 434 | int ret = LTTNG_OK, to_create = 0; |
edb67388 DG |
435 | struct ltt_ust_event *uevent; |
436 | ||
0525e9ae DG |
437 | assert(usess); |
438 | assert(uchan); | |
439 | assert(event); | |
440 | ||
18eace3b DG |
441 | rcu_read_lock(); |
442 | ||
025faf73 | 443 | uevent = trace_ust_find_event(uchan->events, event->name, filter, |
18eace3b | 444 | event->loglevel); |
edb67388 | 445 | if (uevent == NULL) { |
025faf73 | 446 | uevent = trace_ust_create_event(event, filter); |
edb67388 | 447 | if (uevent == NULL) { |
95a82664 | 448 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
edb67388 DG |
449 | goto error; |
450 | } | |
025faf73 | 451 | |
fc34caaa | 452 | /* Valid to set it after the goto error since uevent is still NULL */ |
edb67388 DG |
453 | to_create = 1; |
454 | } | |
2bdd86d4 | 455 | |
7f79d3a1 DG |
456 | if (uevent->enabled) { |
457 | /* It's already enabled so everything is OK */ | |
5bcdda4f | 458 | ret = LTTNG_ERR_UST_EVENT_ENABLED; |
7f79d3a1 DG |
459 | goto end; |
460 | } | |
461 | ||
fc34caaa DG |
462 | uevent->enabled = 1; |
463 | ||
edb67388 DG |
464 | switch (domain) { |
465 | case LTTNG_DOMAIN_UST: | |
466 | { | |
467 | if (to_create) { | |
468 | /* Create event on all UST registered apps for session */ | |
35a9059d | 469 | ret = ust_app_create_event_glb(usess, uchan, uevent); |
edb67388 DG |
470 | } else { |
471 | /* Enable event on all UST registered apps for session */ | |
35a9059d | 472 | ret = ust_app_enable_event_glb(usess, uchan, uevent); |
edb67388 | 473 | } |
48842b30 | 474 | |
edb67388 | 475 | if (ret < 0) { |
49c336c1 | 476 | if (ret == -LTTNG_UST_ERR_EXIST) { |
f73fabfd | 477 | ret = LTTNG_ERR_UST_EVENT_EXIST; |
7f79d3a1 | 478 | goto end; |
edb67388 | 479 | } else { |
f73fabfd | 480 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
7f79d3a1 | 481 | goto error; |
edb67388 | 482 | } |
edb67388 | 483 | } |
edb67388 DG |
484 | break; |
485 | } | |
d78d6610 | 486 | #if 0 |
edb67388 DG |
487 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
488 | case LTTNG_DOMAIN_UST_PID: | |
489 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 490 | #endif |
edb67388 | 491 | default: |
f73fabfd | 492 | ret = LTTNG_ERR_UND; |
7f79d3a1 | 493 | goto end; |
2bdd86d4 | 494 | } |
48842b30 | 495 | |
7f79d3a1 | 496 | if (to_create) { |
fc34caaa | 497 | /* Add ltt ust event to channel */ |
18eace3b | 498 | add_unique_ust_event(uchan->events, uevent); |
7f79d3a1 | 499 | } |
edb67388 | 500 | |
7f79d3a1 DG |
501 | DBG("Event UST %s %s in channel %s", uevent->attr.name, |
502 | to_create ? "created" : "enabled", uchan->name); | |
503 | ||
f73fabfd | 504 | ret = LTTNG_OK; |
fc34caaa | 505 | |
fb89d070 | 506 | end: |
18eace3b | 507 | rcu_read_unlock(); |
fc34caaa | 508 | return ret; |
edb67388 DG |
509 | |
510 | error: | |
fc34caaa DG |
511 | /* |
512 | * Only destroy event on creation time (not enabling time) because if the | |
513 | * event is found in the channel (to_create == 0), it means that at some | |
514 | * point the enable_event worked and it's thus valid to keep it alive. | |
515 | * Destroying it also implies that we also destroy it's shadow copy to sync | |
516 | * everyone up. | |
517 | */ | |
518 | if (to_create) { | |
519 | /* In this code path, the uevent was not added to the hash table */ | |
520 | trace_ust_destroy_event(uevent); | |
521 | } | |
18eace3b | 522 | rcu_read_unlock(); |
2bdd86d4 MD |
523 | return ret; |
524 | } | |
525 | ||
7f79d3a1 DG |
526 | /* |
527 | * Disable UST tracepoint of a channel from a UST session. | |
528 | */ | |
529 | int event_ust_disable_tracepoint(struct ltt_ust_session *usess, int domain, | |
530 | struct ltt_ust_channel *uchan, char *event_name) | |
2bdd86d4 MD |
531 | { |
532 | int ret; | |
7f79d3a1 | 533 | struct ltt_ust_event *uevent; |
18eace3b DG |
534 | struct lttng_ht_node_str *node; |
535 | struct lttng_ht_iter iter; | |
18eace3b | 536 | struct lttng_ht *ht; |
2bdd86d4 | 537 | |
0525e9ae DG |
538 | assert(usess); |
539 | assert(uchan); | |
540 | assert(event_name); | |
541 | ||
18eace3b DG |
542 | ht = uchan->events; |
543 | ||
18eace3b | 544 | rcu_read_lock(); |
025faf73 DG |
545 | |
546 | /* | |
547 | * We use a custom lookup since we need the iterator for the next_duplicate | |
548 | * call in the do while loop below. | |
549 | */ | |
550 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) event_name, lttng_ht_seed), | |
551 | trace_ust_ht_match_event_by_name, event_name, &iter.iter); | |
18eace3b DG |
552 | node = lttng_ht_iter_get_node_str(&iter); |
553 | if (node == NULL) { | |
554 | DBG2("Trace UST event NOT found by name %s", event_name); | |
f73fabfd | 555 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
7f79d3a1 | 556 | goto error; |
2bdd86d4 | 557 | } |
7f79d3a1 | 558 | |
18eace3b DG |
559 | do { |
560 | uevent = caa_container_of(node, struct ltt_ust_event, node); | |
025faf73 DG |
561 | assert(uevent); |
562 | ||
18eace3b DG |
563 | if (uevent->enabled == 0) { |
564 | /* It's already disabled so everything is OK */ | |
565 | ret = LTTNG_OK; | |
566 | continue; | |
7f79d3a1 | 567 | } |
18eace3b DG |
568 | |
569 | switch (domain) { | |
570 | case LTTNG_DOMAIN_UST: | |
571 | ret = ust_app_disable_event_glb(usess, uchan, uevent); | |
572 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { | |
573 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
574 | goto error; | |
575 | } | |
576 | break; | |
d78d6610 | 577 | #if 0 |
18eace3b DG |
578 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
579 | case LTTNG_DOMAIN_UST_PID: | |
580 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 581 | #endif |
18eace3b DG |
582 | default: |
583 | ret = LTTNG_ERR_UND; | |
584 | goto error; | |
585 | } | |
586 | ||
587 | uevent->enabled = 0; | |
588 | ||
025faf73 DG |
589 | DBG2("Event UST %s disabled in channel %s", uevent->attr.name, |
590 | uchan->name); | |
591 | ||
18eace3b DG |
592 | /* Get next duplicate event by name. */ |
593 | cds_lfht_next_duplicate(ht->ht, trace_ust_ht_match_event_by_name, | |
594 | event_name, &iter.iter); | |
595 | node = lttng_ht_iter_get_node_str(&iter); | |
596 | } while (node); | |
7f79d3a1 | 597 | |
f73fabfd | 598 | ret = LTTNG_OK; |
7f79d3a1 | 599 | |
7f79d3a1 | 600 | error: |
18eace3b | 601 | rcu_read_unlock(); |
7f79d3a1 DG |
602 | return ret; |
603 | } | |
604 | ||
605 | /* | |
606 | * Disable all UST tracepoints for a channel from a UST session. | |
607 | */ | |
608 | int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess, int domain, | |
609 | struct ltt_ust_channel *uchan) | |
610 | { | |
6775595e | 611 | int ret, i, size; |
bec39940 | 612 | struct lttng_ht_iter iter; |
7f79d3a1 DG |
613 | struct ltt_ust_event *uevent = NULL; |
614 | struct lttng_event *events = NULL; | |
615 | ||
0525e9ae DG |
616 | assert(usess); |
617 | assert(uchan); | |
618 | ||
025faf73 DG |
619 | rcu_read_lock(); |
620 | ||
7f79d3a1 DG |
621 | switch (domain) { |
622 | case LTTNG_DOMAIN_UST: | |
623 | { | |
624 | /* Disabling existing events */ | |
bec39940 DG |
625 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, |
626 | node.node) { | |
7f79d3a1 | 627 | if (uevent->enabled == 1) { |
025faf73 DG |
628 | ret = event_ust_disable_tracepoint(usess, domain, uchan, |
629 | uevent->attr.name); | |
7f79d3a1 DG |
630 | if (ret < 0) { |
631 | continue; | |
632 | } | |
7f79d3a1 DG |
633 | } |
634 | } | |
635 | ||
636 | /* Get all UST available events */ | |
637 | size = ust_app_list_events(&events); | |
638 | if (size < 0) { | |
f73fabfd | 639 | ret = LTTNG_ERR_UST_LIST_FAIL; |
7f79d3a1 DG |
640 | goto error; |
641 | } | |
642 | ||
643 | for (i = 0; i < size; i++) { | |
18eace3b | 644 | ret = event_ust_disable_tracepoint(usess, domain, uchan, |
7f79d3a1 | 645 | events[i].name); |
18eace3b DG |
646 | if (ret != LTTNG_OK) { |
647 | /* Continue to disable the rest... */ | |
7f79d3a1 DG |
648 | continue; |
649 | } | |
650 | } | |
651 | ||
652 | free(events); | |
653 | break; | |
654 | } | |
d78d6610 | 655 | #if 0 |
7f79d3a1 DG |
656 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
657 | case LTTNG_DOMAIN_UST_PID: | |
658 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 659 | #endif |
7f79d3a1 | 660 | default: |
f73fabfd | 661 | ret = LTTNG_ERR_UND; |
7f79d3a1 DG |
662 | goto error; |
663 | } | |
664 | ||
025faf73 | 665 | rcu_read_unlock(); |
f73fabfd | 666 | return LTTNG_OK; |
7f79d3a1 DG |
667 | |
668 | error: | |
669 | free(events); | |
025faf73 | 670 | rcu_read_unlock(); |
2bdd86d4 MD |
671 | return ret; |
672 | } |