Commit | Line | Data |
---|---|---|
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 | |
18eace3b DG |
35 | static void add_unique_ust_event(struct lttng_ht *ht, |
36 | struct ltt_ust_event *event) | |
37 | { | |
38 | struct cds_lfht_node *node_ptr; | |
39 | struct ltt_ust_ht_key key; | |
40 | ||
41 | assert(ht); | |
42 | assert(ht->ht); | |
43 | assert(event); | |
44 | ||
45 | key.name = event->attr.name; | |
46 | key.filter = (struct lttng_filter_bytecode *) event->filter; | |
47 | key.loglevel = event->attr.loglevel; | |
48 | ||
49 | node_ptr = cds_lfht_add_unique(ht->ht, | |
50 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
51 | trace_ust_ht_match_event, &key, &event->node.node); | |
52 | assert(node_ptr == &event->node.node); | |
53 | } | |
54 | ||
8c9ae521 DG |
55 | /* |
56 | * Setup a lttng_event used to enable *all* syscall tracing. | |
57 | */ | |
58 | static void init_syscalls_kernel_event(struct lttng_event *event) | |
59 | { | |
60 | event->name[0] = '\0'; | |
61 | /* | |
62 | * We use LTTNG_EVENT* here since the trace kernel creation will make the | |
63 | * right changes for the kernel. | |
64 | */ | |
65 | event->type = LTTNG_EVENT_SYSCALL; | |
66 | } | |
67 | ||
a027b2d2 MD |
68 | /* |
69 | * Return 1 if loglevels match or 0 on failure. | |
70 | */ | |
71 | static int loglevel_match(struct ltt_ust_event *uevent, | |
72 | enum lttng_ust_loglevel_type log_type, int loglevel) | |
73 | { | |
51f1a3b9 DG |
74 | /* |
75 | * For the loglevel type ALL, the loglevel is set to -1 but the event | |
76 | * received by the session daemon is 0 which does not match the negative | |
77 | * value in the existing event. | |
78 | */ | |
79 | if (log_type == LTTNG_UST_LOGLEVEL_ALL) { | |
80 | loglevel = -1; | |
81 | } | |
82 | ||
a027b2d2 MD |
83 | if (uevent == NULL || uevent->attr.loglevel_type != log_type || |
84 | uevent->attr.loglevel != loglevel) { | |
85 | goto no_match; | |
86 | } | |
87 | ||
88 | return 1; | |
89 | ||
90 | no_match: | |
91 | return 0; | |
92 | } | |
93 | ||
54d01ffb | 94 | /* |
7a3d1328 | 95 | * Disable kernel tracepoint event for a channel from the kernel session. |
54d01ffb | 96 | */ |
7a3d1328 | 97 | int event_kernel_disable_tracepoint(struct ltt_kernel_session *ksession, |
54d01ffb DG |
98 | struct ltt_kernel_channel *kchan, char *event_name) |
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) { | |
f73fabfd | 105 | ret = LTTNG_ERR_NO_EVENT; |
54d01ffb DG |
106 | goto error; |
107 | } | |
108 | ||
109 | ret = kernel_disable_event(kevent); | |
110 | if (ret < 0) { | |
f73fabfd | 111 | ret = LTTNG_ERR_KERN_DISABLE_FAIL; |
54d01ffb DG |
112 | goto error; |
113 | } | |
114 | ||
115 | DBG("Kernel event %s disable for channel %s.", | |
116 | kevent->event->name, kchan->channel->name); | |
117 | ||
f73fabfd | 118 | ret = LTTNG_OK; |
54d01ffb DG |
119 | |
120 | error: | |
121 | return ret; | |
122 | } | |
123 | ||
124 | /* | |
7a3d1328 | 125 | * Disable kernel tracepoint events for a channel from the kernel session. |
54d01ffb | 126 | */ |
7a3d1328 | 127 | int event_kernel_disable_all_tracepoints(struct ltt_kernel_session *ksession, |
54d01ffb DG |
128 | struct ltt_kernel_channel *kchan) |
129 | { | |
130 | int ret; | |
131 | struct ltt_kernel_event *kevent; | |
132 | ||
133 | /* For each event in the kernel session */ | |
134 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
135 | ret = kernel_disable_event(kevent); | |
136 | if (ret < 0) { | |
137 | /* We continue disabling the rest */ | |
138 | continue; | |
139 | } | |
140 | } | |
f73fabfd | 141 | ret = LTTNG_OK; |
7a3d1328 MD |
142 | return ret; |
143 | } | |
144 | ||
145 | /* | |
146 | * Disable kernel syscall events for a channel from the kernel session. | |
147 | */ | |
148 | int event_kernel_disable_all_syscalls(struct ltt_kernel_session *ksession, | |
149 | struct ltt_kernel_channel *kchan) | |
150 | { | |
151 | ERR("Cannot disable syscall tracing for existing session. Please destroy session instead."); | |
f73fabfd | 152 | return LTTNG_OK; /* Return OK so disable all succeeds */ |
7a3d1328 | 153 | } |
54d01ffb | 154 | |
7a3d1328 MD |
155 | /* |
156 | * Disable all kernel event for a channel from the kernel session. | |
157 | */ | |
158 | int event_kernel_disable_all(struct ltt_kernel_session *ksession, | |
159 | struct ltt_kernel_channel *kchan) | |
160 | { | |
161 | int ret; | |
162 | ||
163 | ret = event_kernel_disable_all_tracepoints(ksession, kchan); | |
f73fabfd | 164 | if (ret != LTTNG_OK) |
7a3d1328 MD |
165 | return ret; |
166 | ret = event_kernel_disable_all_syscalls(ksession, kchan); | |
54d01ffb DG |
167 | return ret; |
168 | } | |
169 | ||
170 | /* | |
7a3d1328 | 171 | * Enable kernel tracepoint event for a channel from the kernel session. |
54d01ffb | 172 | */ |
7a3d1328 | 173 | int event_kernel_enable_tracepoint(struct ltt_kernel_session *ksession, |
54d01ffb DG |
174 | struct ltt_kernel_channel *kchan, struct lttng_event *event) |
175 | { | |
176 | int ret; | |
177 | struct ltt_kernel_event *kevent; | |
178 | ||
179 | kevent = trace_kernel_get_event_by_name(event->name, kchan); | |
180 | if (kevent == NULL) { | |
181 | ret = kernel_create_event(event, kchan); | |
182 | if (ret < 0) { | |
bd29c13d DG |
183 | switch (-ret) { |
184 | case EEXIST: | |
f73fabfd | 185 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
bd29c13d DG |
186 | break; |
187 | case ENOSYS: | |
f73fabfd | 188 | ret = LTTNG_ERR_KERN_EVENT_ENOSYS; |
bd29c13d DG |
189 | break; |
190 | default: | |
f73fabfd | 191 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
bd29c13d | 192 | break; |
d87bfb32 | 193 | } |
7a3d1328 | 194 | goto end; |
54d01ffb DG |
195 | } |
196 | } else if (kevent->enabled == 0) { | |
197 | ret = kernel_enable_event(kevent); | |
198 | if (ret < 0) { | |
f73fabfd | 199 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
7a3d1328 | 200 | goto end; |
54d01ffb | 201 | } |
42224349 DG |
202 | } else { |
203 | /* At this point, the event is considered enabled */ | |
f73fabfd | 204 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 | 205 | goto end; |
54d01ffb | 206 | } |
42224349 | 207 | |
f73fabfd | 208 | ret = LTTNG_OK; |
7a3d1328 | 209 | end: |
54d01ffb DG |
210 | return ret; |
211 | } | |
212 | ||
213 | /* | |
7a3d1328 | 214 | * Enable all kernel tracepoint events of a channel of the kernel session. |
54d01ffb | 215 | */ |
7a3d1328 | 216 | int event_kernel_enable_all_tracepoints(struct ltt_kernel_session *ksession, |
54d01ffb DG |
217 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
218 | { | |
219 | int size, i, ret; | |
220 | struct ltt_kernel_event *kevent; | |
8f69e5eb | 221 | struct lttng_event *event_list = NULL; |
54d01ffb DG |
222 | |
223 | /* For each event in the kernel session */ | |
224 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
8f69e5eb DG |
225 | if (kevent->enabled == 0) { |
226 | ret = kernel_enable_event(kevent); | |
227 | if (ret < 0) { | |
228 | /* Enable failed but still continue */ | |
229 | continue; | |
230 | } | |
54d01ffb DG |
231 | } |
232 | } | |
233 | ||
234 | size = kernel_list_events(kernel_tracer_fd, &event_list); | |
235 | if (size < 0) { | |
f73fabfd | 236 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
7a3d1328 | 237 | goto end; |
54d01ffb DG |
238 | } |
239 | ||
240 | for (i = 0; i < size; i++) { | |
241 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); | |
242 | if (kevent == NULL) { | |
243 | /* Default event type for enable all */ | |
244 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
245 | /* Enable each single tracepoint event */ | |
246 | ret = kernel_create_event(&event_list[i], kchan); | |
247 | if (ret < 0) { | |
248 | /* Ignore error here and continue */ | |
249 | } | |
250 | } | |
251 | } | |
54d01ffb | 252 | free(event_list); |
8f69e5eb | 253 | |
f73fabfd | 254 | ret = LTTNG_OK; |
7a3d1328 | 255 | end: |
54d01ffb | 256 | return ret; |
7a3d1328 | 257 | |
54d01ffb | 258 | } |
8c9ae521 DG |
259 | |
260 | /* | |
7a3d1328 | 261 | * Enable all kernel tracepoint events of a channel of the kernel session. |
8c9ae521 | 262 | */ |
7a3d1328 | 263 | int event_kernel_enable_all_syscalls(struct ltt_kernel_session *ksession, |
8c9ae521 DG |
264 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
265 | { | |
266 | int ret; | |
267 | struct lttng_event event; | |
268 | ||
269 | init_syscalls_kernel_event(&event); | |
270 | ||
271 | DBG("Enabling all syscall tracing"); | |
272 | ||
273 | ret = kernel_create_event(&event, kchan); | |
274 | if (ret < 0) { | |
8f69e5eb | 275 | if (ret == -EEXIST) { |
f73fabfd | 276 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
8f69e5eb | 277 | } else { |
f73fabfd | 278 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
8f69e5eb | 279 | } |
7a3d1328 | 280 | goto end; |
8c9ae521 | 281 | } |
8f69e5eb | 282 | |
f73fabfd | 283 | ret = LTTNG_OK; |
7a3d1328 MD |
284 | end: |
285 | return ret; | |
286 | } | |
8c9ae521 | 287 | |
7a3d1328 MD |
288 | /* |
289 | * Enable all kernel events of a channel of the kernel session. | |
290 | */ | |
291 | int event_kernel_enable_all(struct ltt_kernel_session *ksession, | |
292 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) | |
293 | { | |
6bd8707a | 294 | int tp_ret; |
7a3d1328 | 295 | |
bd29c13d | 296 | tp_ret = event_kernel_enable_all_tracepoints(ksession, kchan, kernel_tracer_fd); |
f73fabfd | 297 | if (tp_ret != LTTNG_OK) { |
7a3d1328 MD |
298 | goto end; |
299 | } | |
bd29c13d DG |
300 | |
301 | /* | |
302 | * Reaching this code path means that all tracepoints were enabled without | |
303 | * errors so we ignore the error value of syscalls. | |
304 | * | |
305 | * At the moment, failing to enable syscalls on "lttng enable-event -a -k" | |
306 | * is not considered an error that need to be returned to the client since | |
307 | * tracepoints did not fail. Future work will allow us to send back | |
308 | * multiple errors to the client in one API call. | |
309 | */ | |
6bd8707a | 310 | (void) event_kernel_enable_all_syscalls(ksession, kchan, kernel_tracer_fd); |
bd29c13d | 311 | |
7a3d1328 | 312 | end: |
bd29c13d | 313 | return tp_ret; |
8c9ae521 | 314 | } |
2bdd86d4 | 315 | |
7f79d3a1 DG |
316 | /* |
317 | * ============================ | |
318 | * UST : The Ultimate Frontier! | |
319 | * ============================ | |
320 | */ | |
321 | ||
76d45b40 DG |
322 | /* |
323 | * Enable all UST tracepoints for a channel from a UST session. | |
324 | */ | |
325 | int event_ust_enable_all_tracepoints(struct ltt_ust_session *usess, int domain, | |
326 | struct ltt_ust_channel *uchan) | |
327 | { | |
6775595e | 328 | int ret, i, size; |
bec39940 | 329 | struct lttng_ht_iter iter; |
76d45b40 | 330 | struct ltt_ust_event *uevent = NULL; |
7f79d3a1 | 331 | struct lttng_event *events = NULL; |
76d45b40 DG |
332 | |
333 | switch (domain) { | |
334 | case LTTNG_DOMAIN_UST: | |
335 | { | |
336 | /* Enable existing events */ | |
bec39940 DG |
337 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, |
338 | node.node) { | |
76d45b40 DG |
339 | if (uevent->enabled == 0) { |
340 | ret = ust_app_enable_event_glb(usess, uchan, uevent); | |
341 | if (ret < 0) { | |
342 | continue; | |
343 | } | |
344 | uevent->enabled = 1; | |
345 | } | |
346 | } | |
347 | ||
348 | /* Get all UST available events */ | |
349 | size = ust_app_list_events(&events); | |
350 | if (size < 0) { | |
f73fabfd | 351 | ret = LTTNG_ERR_UST_LIST_FAIL; |
76d45b40 DG |
352 | goto error; |
353 | } | |
354 | ||
355 | for (i = 0; i < size; i++) { | |
356 | /* | |
357 | * Check if event exist and if so, continue since it was enable | |
358 | * previously. | |
359 | */ | |
18eace3b DG |
360 | uevent = trace_ust_find_event(uchan->events, events[i].name, NULL, |
361 | events[i].loglevel); | |
76d45b40 DG |
362 | if (uevent != NULL) { |
363 | ret = ust_app_enable_event_pid(usess, uchan, uevent, | |
364 | events[i].pid); | |
365 | if (ret < 0) { | |
49c336c1 | 366 | if (ret != -LTTNG_UST_ERR_EXIST) { |
f73fabfd | 367 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
76d45b40 DG |
368 | goto error; |
369 | } | |
370 | } | |
371 | continue; | |
372 | } | |
373 | ||
374 | /* Create ust event */ | |
375 | uevent = trace_ust_create_event(&events[i]); | |
376 | if (uevent == NULL) { | |
f73fabfd | 377 | ret = LTTNG_ERR_FATAL; |
7f79d3a1 | 378 | goto error_destroy; |
76d45b40 DG |
379 | } |
380 | ||
381 | /* Create event for the specific PID */ | |
382 | ret = ust_app_enable_event_pid(usess, uchan, uevent, | |
383 | events[i].pid); | |
384 | if (ret < 0) { | |
49c336c1 | 385 | if (ret == -LTTNG_UST_ERR_EXIST) { |
f73fabfd | 386 | ret = LTTNG_ERR_UST_EVENT_EXIST; |
7f79d3a1 | 387 | goto error; |
76d45b40 | 388 | } else { |
f73fabfd | 389 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
7f79d3a1 | 390 | goto error_destroy; |
76d45b40 | 391 | } |
76d45b40 DG |
392 | } |
393 | ||
394 | uevent->enabled = 1; | |
395 | /* Add ltt ust event to channel */ | |
396 | rcu_read_lock(); | |
18eace3b | 397 | add_unique_ust_event(uchan->events, uevent); |
76d45b40 DG |
398 | rcu_read_unlock(); |
399 | } | |
400 | ||
401 | free(events); | |
402 | break; | |
403 | } | |
d78d6610 | 404 | #if 0 |
76d45b40 DG |
405 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
406 | case LTTNG_DOMAIN_UST_PID: | |
407 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 408 | #endif |
76d45b40 | 409 | default: |
f73fabfd | 410 | ret = LTTNG_ERR_UND; |
76d45b40 DG |
411 | goto error; |
412 | } | |
413 | ||
f73fabfd | 414 | return LTTNG_OK; |
76d45b40 | 415 | |
7f79d3a1 | 416 | error_destroy: |
76d45b40 | 417 | trace_ust_destroy_event(uevent); |
7f79d3a1 DG |
418 | |
419 | error: | |
420 | free(events); | |
76d45b40 DG |
421 | return ret; |
422 | } | |
423 | ||
2bdd86d4 MD |
424 | /* |
425 | * Enable UST tracepoint event for a channel from a UST session. | |
426 | */ | |
edb67388 DG |
427 | int event_ust_enable_tracepoint(struct ltt_ust_session *usess, int domain, |
428 | struct ltt_ust_channel *uchan, struct lttng_event *event) | |
2bdd86d4 | 429 | { |
f73fabfd | 430 | int ret = LTTNG_OK, to_create = 0; |
edb67388 DG |
431 | struct ltt_ust_event *uevent; |
432 | ||
18eace3b DG |
433 | DBG3("Enable ust: %s l:%d f:%p", event->name, event->loglevel, NULL); |
434 | ||
435 | rcu_read_lock(); | |
436 | ||
437 | uevent = trace_ust_find_event(uchan->events, event->name, NULL, | |
438 | event->loglevel); | |
edb67388 DG |
439 | if (uevent == NULL) { |
440 | uevent = trace_ust_create_event(event); | |
441 | if (uevent == NULL) { | |
95a82664 | 442 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
edb67388 DG |
443 | goto error; |
444 | } | |
fc34caaa | 445 | /* Valid to set it after the goto error since uevent is still NULL */ |
edb67388 DG |
446 | to_create = 1; |
447 | } | |
2bdd86d4 | 448 | |
a027b2d2 MD |
449 | /* Check loglevels */ |
450 | ret = loglevel_match(uevent, event->loglevel_type, event->loglevel); | |
451 | if (ret == 0) { | |
452 | /* | |
453 | * No match meaning that the user tried to enable a known event but | |
454 | * with a different loglevel. | |
455 | */ | |
456 | DBG("Enable event %s does not match existing event %s with loglevel " | |
457 | "respectively of %d and %d", event->name, uevent->attr.name, | |
458 | uevent->attr.loglevel, event->loglevel); | |
f73fabfd | 459 | ret = LTTNG_ERR_EVENT_EXIST_LOGLEVEL; |
a027b2d2 MD |
460 | goto error; |
461 | } | |
462 | ||
7f79d3a1 DG |
463 | if (uevent->enabled) { |
464 | /* It's already enabled so everything is OK */ | |
f73fabfd | 465 | ret = LTTNG_OK; |
7f79d3a1 DG |
466 | goto end; |
467 | } | |
468 | ||
fc34caaa DG |
469 | uevent->enabled = 1; |
470 | ||
edb67388 DG |
471 | switch (domain) { |
472 | case LTTNG_DOMAIN_UST: | |
473 | { | |
474 | if (to_create) { | |
475 | /* Create event on all UST registered apps for session */ | |
35a9059d | 476 | ret = ust_app_create_event_glb(usess, uchan, uevent); |
edb67388 DG |
477 | } else { |
478 | /* Enable event on all UST registered apps for session */ | |
35a9059d | 479 | ret = ust_app_enable_event_glb(usess, uchan, uevent); |
edb67388 | 480 | } |
48842b30 | 481 | |
edb67388 | 482 | if (ret < 0) { |
49c336c1 | 483 | if (ret == -LTTNG_UST_ERR_EXIST) { |
f73fabfd | 484 | ret = LTTNG_ERR_UST_EVENT_EXIST; |
7f79d3a1 | 485 | goto end; |
edb67388 | 486 | } else { |
f73fabfd | 487 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
7f79d3a1 | 488 | goto error; |
edb67388 | 489 | } |
edb67388 | 490 | } |
edb67388 DG |
491 | break; |
492 | } | |
d78d6610 | 493 | #if 0 |
edb67388 DG |
494 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
495 | case LTTNG_DOMAIN_UST_PID: | |
496 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 497 | #endif |
edb67388 | 498 | default: |
f73fabfd | 499 | ret = LTTNG_ERR_UND; |
7f79d3a1 | 500 | goto end; |
2bdd86d4 | 501 | } |
48842b30 | 502 | |
7f79d3a1 | 503 | if (to_create) { |
fc34caaa | 504 | /* Add ltt ust event to channel */ |
18eace3b | 505 | add_unique_ust_event(uchan->events, uevent); |
7f79d3a1 | 506 | } |
edb67388 | 507 | |
7f79d3a1 DG |
508 | DBG("Event UST %s %s in channel %s", uevent->attr.name, |
509 | to_create ? "created" : "enabled", uchan->name); | |
510 | ||
f73fabfd | 511 | ret = LTTNG_OK; |
fc34caaa | 512 | |
fb89d070 | 513 | end: |
18eace3b | 514 | rcu_read_unlock(); |
fc34caaa | 515 | return ret; |
edb67388 DG |
516 | |
517 | error: | |
fc34caaa DG |
518 | /* |
519 | * Only destroy event on creation time (not enabling time) because if the | |
520 | * event is found in the channel (to_create == 0), it means that at some | |
521 | * point the enable_event worked and it's thus valid to keep it alive. | |
522 | * Destroying it also implies that we also destroy it's shadow copy to sync | |
523 | * everyone up. | |
524 | */ | |
525 | if (to_create) { | |
526 | /* In this code path, the uevent was not added to the hash table */ | |
527 | trace_ust_destroy_event(uevent); | |
528 | } | |
18eace3b | 529 | rcu_read_unlock(); |
2bdd86d4 MD |
530 | return ret; |
531 | } | |
532 | ||
7f79d3a1 DG |
533 | /* |
534 | * Disable UST tracepoint of a channel from a UST session. | |
535 | */ | |
536 | int event_ust_disable_tracepoint(struct ltt_ust_session *usess, int domain, | |
537 | struct ltt_ust_channel *uchan, char *event_name) | |
2bdd86d4 MD |
538 | { |
539 | int ret; | |
7f79d3a1 | 540 | struct ltt_ust_event *uevent; |
18eace3b DG |
541 | struct lttng_ht_node_str *node; |
542 | struct lttng_ht_iter iter; | |
543 | void *orig_match_fct; | |
544 | struct lttng_ht *ht; | |
2bdd86d4 | 545 | |
18eace3b DG |
546 | ht = uchan->events; |
547 | ||
548 | /* Save match function so we can use the event by name match. */ | |
549 | orig_match_fct = (void *) ht->match_fct; | |
550 | ht->match_fct = trace_ust_ht_match_event_by_name; | |
551 | ||
552 | rcu_read_lock(); | |
553 | lttng_ht_lookup(ht, (void *) event_name, &iter); | |
554 | node = lttng_ht_iter_get_node_str(&iter); | |
555 | if (node == NULL) { | |
556 | DBG2("Trace UST event NOT found by name %s", event_name); | |
f73fabfd | 557 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
7f79d3a1 | 558 | goto error; |
2bdd86d4 | 559 | } |
7f79d3a1 | 560 | |
18eace3b DG |
561 | do { |
562 | uevent = caa_container_of(node, struct ltt_ust_event, node); | |
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 | ||
589 | /* Get next duplicate event by name. */ | |
590 | cds_lfht_next_duplicate(ht->ht, trace_ust_ht_match_event_by_name, | |
591 | event_name, &iter.iter); | |
592 | node = lttng_ht_iter_get_node_str(&iter); | |
593 | } while (node); | |
7f79d3a1 | 594 | |
f73fabfd | 595 | ret = LTTNG_OK; |
7f79d3a1 | 596 | |
7f79d3a1 DG |
597 | DBG2("Event UST %s disabled in channel %s", uevent->attr.name, |
598 | uchan->name); | |
7f79d3a1 | 599 | error: |
18eace3b DG |
600 | ht->match_fct = orig_match_fct; |
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 | ||
616 | switch (domain) { | |
617 | case LTTNG_DOMAIN_UST: | |
618 | { | |
619 | /* Disabling existing events */ | |
bec39940 DG |
620 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, |
621 | node.node) { | |
7f79d3a1 DG |
622 | if (uevent->enabled == 1) { |
623 | ret = ust_app_disable_event_glb(usess, uchan, uevent); | |
624 | if (ret < 0) { | |
625 | continue; | |
626 | } | |
627 | uevent->enabled = 0; | |
628 | } | |
629 | } | |
630 | ||
631 | /* Get all UST available events */ | |
632 | size = ust_app_list_events(&events); | |
633 | if (size < 0) { | |
f73fabfd | 634 | ret = LTTNG_ERR_UST_LIST_FAIL; |
7f79d3a1 DG |
635 | goto error; |
636 | } | |
637 | ||
638 | for (i = 0; i < size; i++) { | |
18eace3b | 639 | ret = event_ust_disable_tracepoint(usess, domain, uchan, |
7f79d3a1 | 640 | events[i].name); |
18eace3b DG |
641 | if (ret != LTTNG_OK) { |
642 | /* Continue to disable the rest... */ | |
7f79d3a1 DG |
643 | continue; |
644 | } | |
645 | } | |
646 | ||
647 | free(events); | |
648 | break; | |
649 | } | |
d78d6610 | 650 | #if 0 |
7f79d3a1 DG |
651 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
652 | case LTTNG_DOMAIN_UST_PID: | |
653 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 654 | #endif |
7f79d3a1 | 655 | default: |
f73fabfd | 656 | ret = LTTNG_ERR_UND; |
7f79d3a1 DG |
657 | goto error; |
658 | } | |
659 | ||
f73fabfd | 660 | return LTTNG_OK; |
7f79d3a1 DG |
661 | |
662 | error: | |
663 | free(events); | |
2bdd86d4 MD |
664 | return ret; |
665 | } |