Commit | Line | Data |
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20fe2104 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 | |
5 | * modify it under the terms of the GNU General Public License | |
82a3637f DG |
6 | * as published by the Free Software Foundation; only version 2 |
7 | * of the License. | |
20fe2104 DG |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | */ | |
18 | ||
8c0faa1d | 19 | #define _GNU_SOURCE |
20fe2104 | 20 | #include <errno.h> |
7b395890 | 21 | #include <fcntl.h> |
20fe2104 DG |
22 | #include <stdlib.h> |
23 | #include <stdio.h> | |
f34daff7 | 24 | #include <string.h> |
8c0faa1d | 25 | #include <unistd.h> |
20fe2104 | 26 | |
8c0faa1d | 27 | #include "lttngerr.h" |
20fe2104 DG |
28 | #include "libkernelctl.h" |
29 | #include "kernel-ctl.h" | |
20fe2104 | 30 | |
d65106b1 DG |
31 | /* |
32 | * kernel_add_channel_context | |
33 | * | |
34 | * Add context on a kernel channel. | |
35 | */ | |
36 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
37 | struct lttng_kernel_context *ctx) | |
38 | { | |
39 | int ret; | |
40 | ||
41 | DBG("Adding context to channel %s", chan->channel->name); | |
42 | ret = kernctl_add_context(chan->fd, ctx); | |
43 | if (ret < 0) { | |
b579acd9 DG |
44 | if (errno != EEXIST) { |
45 | perror("add context ioctl"); | |
46 | } else { | |
47 | /* If EEXIST, we just ignore the error */ | |
48 | ret = 0; | |
49 | } | |
d65106b1 DG |
50 | goto error; |
51 | } | |
52 | ||
53 | chan->ctx = malloc(sizeof(struct lttng_kernel_context)); | |
54 | if (chan->ctx == NULL) { | |
55 | perror("malloc event context"); | |
56 | goto error; | |
57 | } | |
58 | ||
59 | memcpy(chan->ctx, ctx, sizeof(struct lttng_kernel_context)); | |
60 | ||
61 | return 0; | |
62 | ||
63 | error: | |
64 | return ret; | |
65 | } | |
66 | ||
67 | /* | |
68 | * kernel_add_event_context | |
69 | * | |
70 | * Add context on a kernel event. | |
71 | */ | |
72 | int kernel_add_event_context(struct ltt_kernel_event *event, | |
73 | struct lttng_kernel_context *ctx) | |
74 | { | |
75 | int ret; | |
76 | ||
77 | DBG("Adding context to event %s", event->event->name); | |
78 | ret = kernctl_add_context(event->fd, ctx); | |
79 | if (ret < 0) { | |
80 | perror("add context ioctl"); | |
81 | goto error; | |
82 | } | |
83 | ||
84 | event->ctx = malloc(sizeof(struct lttng_kernel_context)); | |
85 | if (event->ctx == NULL) { | |
86 | perror("malloc event context"); | |
87 | goto error; | |
88 | } | |
89 | ||
90 | memcpy(event->ctx, ctx, sizeof(struct lttng_kernel_context)); | |
91 | ||
92 | return 0; | |
93 | ||
94 | error: | |
95 | return ret; | |
96 | } | |
97 | ||
20fe2104 DG |
98 | /* |
99 | * kernel_create_session | |
100 | * | |
54012638 DG |
101 | * Create a new kernel session, register it to the kernel tracer and add it to |
102 | * the session daemon session. | |
20fe2104 | 103 | */ |
8c0faa1d | 104 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
105 | { |
106 | int ret; | |
107 | struct ltt_kernel_session *lks; | |
108 | ||
54012638 DG |
109 | /* Allocate data structure */ |
110 | lks = trace_create_kernel_session(); | |
20fe2104 | 111 | if (lks == NULL) { |
54012638 | 112 | ret = -1; |
20fe2104 DG |
113 | goto error; |
114 | } | |
115 | ||
54012638 | 116 | /* Kernel tracer session creation */ |
20fe2104 DG |
117 | ret = kernctl_create_session(tracer_fd); |
118 | if (ret < 0) { | |
54012638 | 119 | perror("ioctl kernel create session"); |
20fe2104 DG |
120 | goto error; |
121 | } | |
122 | ||
20fe2104 | 123 | lks->fd = ret; |
7b395890 DG |
124 | /* Prevent fd duplication after execlp() */ |
125 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
126 | if (ret < 0) { | |
127 | perror("fcntl session fd"); | |
128 | } | |
129 | ||
f3ed775e | 130 | lks->kconsumer_fds_sent = 0; |
8c0faa1d | 131 | session->kernel_session = lks; |
8c0faa1d DG |
132 | |
133 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
134 | |
135 | return 0; | |
136 | ||
137 | error: | |
138 | return ret; | |
139 | } | |
140 | ||
141 | /* | |
142 | * kernel_create_channel | |
143 | * | |
54012638 DG |
144 | * Create a kernel channel, register it to the kernel tracer and add it to the |
145 | * kernel session. | |
20fe2104 | 146 | */ |
b082db07 | 147 | int kernel_create_channel(struct ltt_kernel_session *session, struct lttng_channel *chan, char *path) |
20fe2104 DG |
148 | { |
149 | int ret; | |
150 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 151 | |
54012638 | 152 | /* Allocate kernel channel */ |
b082db07 | 153 | lkc = trace_create_kernel_channel(chan, path); |
54012638 | 154 | if (lkc == NULL) { |
20fe2104 DG |
155 | goto error; |
156 | } | |
157 | ||
54012638 | 158 | /* Kernel tracer channel creation */ |
f3ed775e | 159 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 160 | if (ret < 0) { |
54012638 | 161 | perror("ioctl kernel create channel"); |
20fe2104 DG |
162 | goto error; |
163 | } | |
164 | ||
54012638 | 165 | /* Setup the channel fd */ |
20fe2104 | 166 | lkc->fd = ret; |
7b395890 DG |
167 | /* Prevent fd duplication after execlp() */ |
168 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
169 | if (ret < 0) { | |
170 | perror("fcntl session fd"); | |
171 | } | |
172 | ||
54012638 | 173 | /* Add channel to session */ |
8c0faa1d DG |
174 | cds_list_add(&lkc->list, &session->channel_list.head); |
175 | session->channel_count++; | |
20fe2104 | 176 | |
f3ed775e DG |
177 | DBG("Kernel channel %s created (fd: %d and path: %s)", |
178 | lkc->channel->name, lkc->fd, lkc->pathname); | |
20fe2104 DG |
179 | |
180 | return 0; | |
181 | ||
182 | error: | |
54012638 | 183 | return -1; |
20fe2104 | 184 | } |
f34daff7 DG |
185 | |
186 | /* | |
f3ed775e | 187 | * kernel_create_event |
f34daff7 | 188 | * |
54012638 DG |
189 | * Create a kernel event, enable it to the kernel tracer and add it to the |
190 | * channel event list of the kernel session. | |
f34daff7 | 191 | */ |
19e70852 | 192 | int kernel_create_event(struct lttng_event *ev, struct ltt_kernel_channel *channel) |
f34daff7 DG |
193 | { |
194 | int ret; | |
195 | struct ltt_kernel_event *event; | |
f34daff7 | 196 | |
f3ed775e | 197 | event = trace_create_kernel_event(ev); |
54012638 | 198 | if (event == NULL) { |
f34daff7 DG |
199 | goto error; |
200 | } | |
201 | ||
f3ed775e DG |
202 | ret = kernctl_create_event(channel->fd, event->event); |
203 | if (ret < 0) { | |
e953ef25 DG |
204 | perror("create event ioctl"); |
205 | goto free_event; | |
8c0faa1d | 206 | } |
f34daff7 | 207 | |
f3ed775e | 208 | event->fd = ret; |
7b395890 DG |
209 | /* Prevent fd duplication after execlp() */ |
210 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
211 | if (ret < 0) { | |
212 | perror("fcntl session fd"); | |
213 | } | |
214 | ||
f3ed775e DG |
215 | /* Add event to event list */ |
216 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
217 | channel->event_count++; |
218 | ||
e953ef25 DG |
219 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
220 | ||
221 | return 0; | |
222 | ||
223 | free_event: | |
224 | free(event); | |
225 | error: | |
226 | return -1; | |
227 | } | |
228 | ||
26cc6b4e DG |
229 | /* |
230 | * kernel_disable_channel | |
231 | * | |
232 | * Disable a kernel channel. | |
233 | */ | |
234 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
235 | { | |
236 | int ret; | |
237 | ||
238 | ret = kernctl_disable(chan->fd); | |
239 | if (ret < 0) { | |
240 | perror("disable chan ioctl"); | |
241 | ret = errno; | |
242 | goto error; | |
243 | } | |
244 | ||
245 | chan->enabled = 0; | |
246 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
247 | ||
248 | return 0; | |
249 | ||
250 | error: | |
251 | return ret; | |
252 | } | |
253 | ||
d36b8583 DG |
254 | /* |
255 | * kernel_enable_channel | |
256 | * | |
257 | * Enable a kernel channel. | |
258 | */ | |
259 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
260 | { | |
261 | int ret; | |
262 | ||
263 | ret = kernctl_enable(chan->fd); | |
264 | if (ret < 0) { | |
265 | perror("enable chan ioctl"); | |
266 | ret = errno; | |
267 | goto error; | |
268 | } | |
269 | ||
270 | chan->enabled = 1; | |
271 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
272 | ||
273 | return 0; | |
274 | ||
275 | error: | |
276 | return ret; | |
277 | } | |
278 | ||
19e70852 DG |
279 | /* |
280 | * kernel_enable_event | |
281 | * | |
282 | * Enable a kernel event. | |
283 | */ | |
284 | int kernel_enable_event(struct ltt_kernel_event *event) | |
285 | { | |
286 | int ret; | |
287 | ||
288 | ret = kernctl_enable(event->fd); | |
289 | if (ret < 0) { | |
290 | perror("enable event ioctl"); | |
7d29a247 DG |
291 | if (errno == EEXIST) { |
292 | ret = -EEXIST; | |
293 | } | |
19e70852 DG |
294 | goto error; |
295 | } | |
296 | ||
297 | event->enabled = 1; | |
298 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
299 | ||
300 | return 0; | |
301 | ||
302 | error: | |
d36b8583 | 303 | return ret; |
19e70852 DG |
304 | } |
305 | ||
e953ef25 DG |
306 | /* |
307 | * kernel_disable_event | |
308 | * | |
19e70852 | 309 | * Disable a kernel event. |
e953ef25 | 310 | */ |
19e70852 | 311 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
312 | { |
313 | int ret; | |
19e70852 DG |
314 | |
315 | ret = kernctl_disable(event->fd); | |
316 | if (ret < 0) { | |
317 | perror("disable event ioctl"); | |
318 | goto error; | |
e953ef25 | 319 | } |
f3ed775e | 320 | |
19e70852 DG |
321 | event->enabled = 0; |
322 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
323 | ||
f34daff7 DG |
324 | return 0; |
325 | ||
326 | error: | |
d36b8583 | 327 | return ret; |
f34daff7 | 328 | } |
aaf26714 DG |
329 | |
330 | /* | |
331 | * kernel_open_metadata | |
332 | * | |
54012638 DG |
333 | * Create kernel metadata, open from the kernel tracer and add it to the |
334 | * kernel session. | |
aaf26714 | 335 | */ |
58a97671 | 336 | int kernel_open_metadata(struct ltt_kernel_session *session, char *path) |
aaf26714 DG |
337 | { |
338 | int ret; | |
339 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 340 | |
54012638 | 341 | /* Allocate kernel metadata */ |
58a97671 | 342 | lkm = trace_create_kernel_metadata(path); |
54012638 | 343 | if (lkm == NULL) { |
aaf26714 DG |
344 | goto error; |
345 | } | |
346 | ||
54012638 | 347 | /* Kernel tracer metadata creation */ |
f3ed775e | 348 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
349 | if (ret < 0) { |
350 | goto error; | |
351 | } | |
352 | ||
8c0faa1d | 353 | lkm->fd = ret; |
7b395890 DG |
354 | /* Prevent fd duplication after execlp() */ |
355 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
356 | if (ret < 0) { | |
357 | perror("fcntl session fd"); | |
358 | } | |
359 | ||
aaf26714 | 360 | session->metadata = lkm; |
8c0faa1d | 361 | |
54012638 | 362 | DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname); |
8c0faa1d DG |
363 | |
364 | return 0; | |
365 | ||
366 | error: | |
54012638 | 367 | return -1; |
8c0faa1d DG |
368 | } |
369 | ||
370 | /* | |
371 | * kernel_start_session | |
372 | * | |
373 | * Start tracing session. | |
374 | */ | |
375 | int kernel_start_session(struct ltt_kernel_session *session) | |
376 | { | |
377 | int ret; | |
378 | ||
379 | ret = kernctl_start_session(session->fd); | |
380 | if (ret < 0) { | |
f3ed775e | 381 | perror("ioctl start session"); |
8c0faa1d DG |
382 | goto error; |
383 | } | |
384 | ||
385 | DBG("Kernel session started"); | |
386 | ||
387 | return 0; | |
388 | ||
389 | error: | |
390 | return ret; | |
391 | } | |
392 | ||
f3ed775e DG |
393 | /* |
394 | * kernel_wait_quiescent | |
395 | * | |
396 | * Make a kernel wait to make sure in-flight probe have completed. | |
397 | */ | |
398 | void kernel_wait_quiescent(int fd) | |
399 | { | |
400 | int ret; | |
401 | ||
402 | DBG("Kernel quiescent wait on %d", fd); | |
403 | ||
404 | ret = kernctl_wait_quiescent(fd); | |
405 | if (ret < 0) { | |
406 | perror("wait quiescent ioctl"); | |
407 | ERR("Kernel quiescent wait failed"); | |
408 | } | |
409 | } | |
410 | ||
411 | /* | |
412 | * kernel_metadata_flush_buffer | |
413 | * | |
414 | * Force flush buffer of metadata. | |
415 | */ | |
416 | int kernel_metadata_flush_buffer(int fd) | |
417 | { | |
418 | int ret; | |
419 | ||
420 | ret = kernctl_buffer_flush(fd); | |
421 | if (ret < 0) { | |
422 | ERR("Fail to flush metadata buffers %d (ret: %d", fd, ret); | |
423 | } | |
424 | ||
425 | return 0; | |
426 | } | |
427 | ||
428 | /* | |
429 | * kernel_flush_buffer | |
430 | * | |
431 | * Force flush buffer for channel. | |
432 | */ | |
433 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
434 | { | |
435 | int ret; | |
436 | struct ltt_kernel_stream *stream; | |
437 | ||
438 | DBG("Flush buffer for channel %s", channel->channel->name); | |
439 | ||
440 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
441 | DBG("Flushing channel stream %d", stream->fd); | |
442 | ret = kernctl_buffer_flush(stream->fd); | |
443 | if (ret < 0) { | |
444 | perror("ioctl"); | |
445 | ERR("Fail to flush buffer for stream %d (ret: %d)", | |
446 | stream->fd, ret); | |
447 | } | |
448 | } | |
449 | ||
450 | return 0; | |
451 | } | |
452 | ||
8c0faa1d DG |
453 | /* |
454 | * kernel_stop_session | |
455 | * | |
456 | * Stop tracing session. | |
457 | */ | |
458 | int kernel_stop_session(struct ltt_kernel_session *session) | |
459 | { | |
460 | int ret; | |
461 | ||
462 | ret = kernctl_stop_session(session->fd); | |
463 | if (ret < 0) { | |
464 | goto error; | |
465 | } | |
466 | ||
467 | DBG("Kernel session stopped"); | |
468 | ||
469 | return 0; | |
470 | ||
471 | error: | |
472 | return ret; | |
473 | } | |
474 | ||
475 | /* | |
f3ed775e | 476 | * kernel_open_channel_stream |
8c0faa1d | 477 | * |
f3ed775e | 478 | * Open stream of channel, register it to the kernel tracer and add it |
54012638 | 479 | * to the stream list of the channel. |
8c0faa1d DG |
480 | * |
481 | * Return the number of created stream. Else, a negative value. | |
482 | */ | |
f3ed775e | 483 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d DG |
484 | { |
485 | int ret; | |
486 | struct ltt_kernel_stream *lks; | |
487 | ||
488 | while ((ret = kernctl_create_stream(channel->fd)) > 0) { | |
54012638 | 489 | lks = trace_create_kernel_stream(); |
8c0faa1d | 490 | if (lks == NULL) { |
54012638 | 491 | close(ret); |
8c0faa1d DG |
492 | goto error; |
493 | } | |
494 | ||
495 | lks->fd = ret; | |
7b395890 DG |
496 | /* Prevent fd duplication after execlp() */ |
497 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
498 | if (ret < 0) { | |
499 | perror("fcntl session fd"); | |
500 | } | |
501 | ||
8e68d1c8 DG |
502 | ret = asprintf(&lks->pathname, "%s/%s_%d", |
503 | channel->pathname, channel->channel->name, channel->stream_count); | |
8c0faa1d DG |
504 | if (ret < 0) { |
505 | perror("asprintf kernel create stream"); | |
506 | goto error; | |
507 | } | |
8c0faa1d | 508 | |
54012638 | 509 | /* Add stream to channe stream list */ |
8c0faa1d DG |
510 | cds_list_add(&lks->list, &channel->stream_list.head); |
511 | channel->stream_count++; | |
8c0faa1d | 512 | |
54012638 DG |
513 | DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)", |
514 | channel->stream_count, lks->fd, lks->state, lks->pathname); | |
515 | } | |
8c0faa1d DG |
516 | |
517 | return channel->stream_count; | |
518 | ||
519 | error: | |
54012638 | 520 | return -1; |
8c0faa1d DG |
521 | } |
522 | ||
523 | /* | |
f3ed775e | 524 | * kernel_open_metadata_stream |
8c0faa1d | 525 | * |
f3ed775e | 526 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 527 | */ |
f3ed775e | 528 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
529 | { |
530 | int ret; | |
531 | ||
532 | ret = kernctl_create_stream(session->metadata->fd); | |
533 | if (ret < 0) { | |
534 | perror("kernel create metadata stream"); | |
8c0faa1d DG |
535 | goto error; |
536 | } | |
537 | ||
538 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
539 | session->metadata_stream_fd = ret; | |
7b395890 DG |
540 | /* Prevent fd duplication after execlp() */ |
541 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
542 | if (ret < 0) { | |
543 | perror("fcntl session fd"); | |
544 | } | |
aaf26714 DG |
545 | |
546 | return 0; | |
547 | ||
548 | error: | |
54012638 | 549 | return -1; |
aaf26714 | 550 | } |
2ef84c95 DG |
551 | |
552 | /* | |
9f19cc17 | 553 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 554 | */ |
9f19cc17 | 555 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 556 | { |
9f19cc17 DG |
557 | int fd, pos; |
558 | char *event; | |
559 | size_t nbmem, count = 0; | |
2ef84c95 DG |
560 | ssize_t size; |
561 | FILE *fp; | |
9f19cc17 | 562 | struct lttng_event *elist; |
2ef84c95 DG |
563 | |
564 | fd = kernctl_tracepoint_list(tracer_fd); | |
565 | if (fd < 0) { | |
566 | perror("kernel tracepoint list"); | |
567 | goto error; | |
568 | } | |
569 | ||
570 | fp = fdopen(fd, "r"); | |
571 | if (fp == NULL) { | |
572 | perror("kernel tracepoint list fdopen"); | |
573 | goto error; | |
574 | } | |
575 | ||
576 | /* | |
577 | * Init memory size counter | |
578 | * See kernel-ctl.h for explanation of this value | |
579 | */ | |
580 | nbmem = KERNEL_EVENT_LIST_SIZE; | |
9f19cc17 | 581 | elist = malloc(sizeof(struct lttng_event) * nbmem); |
2ef84c95 | 582 | |
9f19cc17 DG |
583 | while ((size = fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { |
584 | if (count > nbmem) { | |
d686b40f | 585 | DBG("Reallocating event list from %zd to %zd bytes", nbmem, |
9f19cc17 | 586 | nbmem + KERNEL_EVENT_LIST_SIZE); |
2ef84c95 | 587 | /* Adding the default size again */ |
9f19cc17 DG |
588 | nbmem += KERNEL_EVENT_LIST_SIZE; |
589 | elist = realloc(elist, nbmem); | |
590 | if (elist == NULL) { | |
2ef84c95 DG |
591 | perror("realloc list events"); |
592 | goto error; | |
593 | } | |
594 | } | |
9f19cc17 DG |
595 | strncpy(elist[count].name, event, strlen(event)); |
596 | count++; | |
2ef84c95 DG |
597 | } |
598 | ||
9f19cc17 | 599 | *events = elist; |
2ef84c95 | 600 | |
9f19cc17 | 601 | DBG("Kernel list events done (%ld events)", count); |
2ef84c95 | 602 | |
9f19cc17 | 603 | return count; |
2ef84c95 DG |
604 | |
605 | error: | |
606 | return -1; | |
607 | } |