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