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 DG |
126 | session->kernel_session = lks; |
127 | session->kern_session_count++; | |
8c0faa1d DG |
128 | |
129 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
130 | |
131 | return 0; | |
132 | ||
133 | error: | |
134 | return ret; | |
135 | } | |
136 | ||
137 | /* | |
138 | * kernel_create_channel | |
139 | * | |
54012638 DG |
140 | * Create a kernel channel, register it to the kernel tracer and add it to the |
141 | * kernel session. | |
20fe2104 | 142 | */ |
b082db07 | 143 | int kernel_create_channel(struct ltt_kernel_session *session, struct lttng_channel *chan, char *path) |
20fe2104 DG |
144 | { |
145 | int ret; | |
146 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 147 | |
54012638 | 148 | /* Allocate kernel channel */ |
b082db07 | 149 | lkc = trace_create_kernel_channel(chan, path); |
54012638 | 150 | if (lkc == NULL) { |
20fe2104 DG |
151 | goto error; |
152 | } | |
153 | ||
54012638 | 154 | /* Kernel tracer channel creation */ |
f3ed775e | 155 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 156 | if (ret < 0) { |
54012638 | 157 | perror("ioctl kernel create channel"); |
20fe2104 DG |
158 | goto error; |
159 | } | |
160 | ||
54012638 | 161 | /* Setup the channel fd */ |
20fe2104 | 162 | lkc->fd = ret; |
7b395890 DG |
163 | /* Prevent fd duplication after execlp() */ |
164 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
165 | if (ret < 0) { | |
166 | perror("fcntl session fd"); | |
167 | } | |
168 | ||
54012638 | 169 | /* Add channel to session */ |
8c0faa1d DG |
170 | cds_list_add(&lkc->list, &session->channel_list.head); |
171 | session->channel_count++; | |
20fe2104 | 172 | |
f3ed775e DG |
173 | DBG("Kernel channel %s created (fd: %d and path: %s)", |
174 | lkc->channel->name, lkc->fd, lkc->pathname); | |
20fe2104 DG |
175 | |
176 | return 0; | |
177 | ||
178 | error: | |
54012638 | 179 | return -1; |
20fe2104 | 180 | } |
f34daff7 DG |
181 | |
182 | /* | |
f3ed775e | 183 | * kernel_create_event |
f34daff7 | 184 | * |
54012638 DG |
185 | * Create a kernel event, enable it to the kernel tracer and add it to the |
186 | * channel event list of the kernel session. | |
f34daff7 | 187 | */ |
19e70852 | 188 | int kernel_create_event(struct lttng_event *ev, struct ltt_kernel_channel *channel) |
f34daff7 DG |
189 | { |
190 | int ret; | |
191 | struct ltt_kernel_event *event; | |
f34daff7 | 192 | |
f3ed775e | 193 | event = trace_create_kernel_event(ev); |
54012638 | 194 | if (event == NULL) { |
f34daff7 DG |
195 | goto error; |
196 | } | |
197 | ||
f3ed775e DG |
198 | ret = kernctl_create_event(channel->fd, event->event); |
199 | if (ret < 0) { | |
e953ef25 DG |
200 | perror("create event ioctl"); |
201 | goto free_event; | |
8c0faa1d | 202 | } |
f34daff7 | 203 | |
f3ed775e | 204 | event->fd = ret; |
7b395890 DG |
205 | /* Prevent fd duplication after execlp() */ |
206 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
207 | if (ret < 0) { | |
208 | perror("fcntl session fd"); | |
209 | } | |
210 | ||
f3ed775e DG |
211 | /* Add event to event list */ |
212 | cds_list_add(&event->list, &channel->events_list.head); | |
e953ef25 DG |
213 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
214 | ||
215 | return 0; | |
216 | ||
217 | free_event: | |
218 | free(event); | |
219 | error: | |
220 | return -1; | |
221 | } | |
222 | ||
26cc6b4e DG |
223 | /* |
224 | * kernel_disable_channel | |
225 | * | |
226 | * Disable a kernel channel. | |
227 | */ | |
228 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
229 | { | |
230 | int ret; | |
231 | ||
232 | ret = kernctl_disable(chan->fd); | |
233 | if (ret < 0) { | |
234 | perror("disable chan ioctl"); | |
235 | ret = errno; | |
236 | goto error; | |
237 | } | |
238 | ||
239 | chan->enabled = 0; | |
240 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
241 | ||
242 | return 0; | |
243 | ||
244 | error: | |
245 | return ret; | |
246 | } | |
247 | ||
d36b8583 DG |
248 | /* |
249 | * kernel_enable_channel | |
250 | * | |
251 | * Enable a kernel channel. | |
252 | */ | |
253 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
254 | { | |
255 | int ret; | |
256 | ||
257 | ret = kernctl_enable(chan->fd); | |
258 | if (ret < 0) { | |
259 | perror("enable chan ioctl"); | |
260 | ret = errno; | |
261 | goto error; | |
262 | } | |
263 | ||
264 | chan->enabled = 1; | |
265 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
266 | ||
267 | return 0; | |
268 | ||
269 | error: | |
270 | return ret; | |
271 | } | |
272 | ||
19e70852 DG |
273 | /* |
274 | * kernel_enable_event | |
275 | * | |
276 | * Enable a kernel event. | |
277 | */ | |
278 | int kernel_enable_event(struct ltt_kernel_event *event) | |
279 | { | |
280 | int ret; | |
281 | ||
282 | ret = kernctl_enable(event->fd); | |
283 | if (ret < 0) { | |
284 | perror("enable event ioctl"); | |
285 | goto error; | |
286 | } | |
287 | ||
288 | event->enabled = 1; | |
289 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
290 | ||
291 | return 0; | |
292 | ||
293 | error: | |
d36b8583 | 294 | return ret; |
19e70852 DG |
295 | } |
296 | ||
e953ef25 DG |
297 | /* |
298 | * kernel_disable_event | |
299 | * | |
19e70852 | 300 | * Disable a kernel event. |
e953ef25 | 301 | */ |
19e70852 | 302 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
303 | { |
304 | int ret; | |
19e70852 DG |
305 | |
306 | ret = kernctl_disable(event->fd); | |
307 | if (ret < 0) { | |
308 | perror("disable event ioctl"); | |
309 | goto error; | |
e953ef25 | 310 | } |
f3ed775e | 311 | |
19e70852 DG |
312 | event->enabled = 0; |
313 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
314 | ||
f34daff7 DG |
315 | return 0; |
316 | ||
317 | error: | |
d36b8583 | 318 | return ret; |
f34daff7 | 319 | } |
aaf26714 DG |
320 | |
321 | /* | |
322 | * kernel_open_metadata | |
323 | * | |
54012638 DG |
324 | * Create kernel metadata, open from the kernel tracer and add it to the |
325 | * kernel session. | |
aaf26714 | 326 | */ |
58a97671 | 327 | int kernel_open_metadata(struct ltt_kernel_session *session, char *path) |
aaf26714 DG |
328 | { |
329 | int ret; | |
330 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 331 | |
54012638 | 332 | /* Allocate kernel metadata */ |
58a97671 | 333 | lkm = trace_create_kernel_metadata(path); |
54012638 | 334 | if (lkm == NULL) { |
aaf26714 DG |
335 | goto error; |
336 | } | |
337 | ||
54012638 | 338 | /* Kernel tracer metadata creation */ |
f3ed775e | 339 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
340 | if (ret < 0) { |
341 | goto error; | |
342 | } | |
343 | ||
8c0faa1d | 344 | lkm->fd = ret; |
7b395890 DG |
345 | /* Prevent fd duplication after execlp() */ |
346 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
347 | if (ret < 0) { | |
348 | perror("fcntl session fd"); | |
349 | } | |
350 | ||
aaf26714 | 351 | session->metadata = lkm; |
8c0faa1d | 352 | |
54012638 | 353 | DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname); |
8c0faa1d DG |
354 | |
355 | return 0; | |
356 | ||
357 | error: | |
54012638 | 358 | return -1; |
8c0faa1d DG |
359 | } |
360 | ||
361 | /* | |
362 | * kernel_start_session | |
363 | * | |
364 | * Start tracing session. | |
365 | */ | |
366 | int kernel_start_session(struct ltt_kernel_session *session) | |
367 | { | |
368 | int ret; | |
369 | ||
370 | ret = kernctl_start_session(session->fd); | |
371 | if (ret < 0) { | |
f3ed775e | 372 | perror("ioctl start session"); |
8c0faa1d DG |
373 | goto error; |
374 | } | |
375 | ||
376 | DBG("Kernel session started"); | |
377 | ||
378 | return 0; | |
379 | ||
380 | error: | |
381 | return ret; | |
382 | } | |
383 | ||
f3ed775e DG |
384 | /* |
385 | * kernel_wait_quiescent | |
386 | * | |
387 | * Make a kernel wait to make sure in-flight probe have completed. | |
388 | */ | |
389 | void kernel_wait_quiescent(int fd) | |
390 | { | |
391 | int ret; | |
392 | ||
393 | DBG("Kernel quiescent wait on %d", fd); | |
394 | ||
395 | ret = kernctl_wait_quiescent(fd); | |
396 | if (ret < 0) { | |
397 | perror("wait quiescent ioctl"); | |
398 | ERR("Kernel quiescent wait failed"); | |
399 | } | |
400 | } | |
401 | ||
402 | /* | |
403 | * kernel_metadata_flush_buffer | |
404 | * | |
405 | * Force flush buffer of metadata. | |
406 | */ | |
407 | int kernel_metadata_flush_buffer(int fd) | |
408 | { | |
409 | int ret; | |
410 | ||
411 | ret = kernctl_buffer_flush(fd); | |
412 | if (ret < 0) { | |
413 | ERR("Fail to flush metadata buffers %d (ret: %d", fd, ret); | |
414 | } | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
419 | /* | |
420 | * kernel_flush_buffer | |
421 | * | |
422 | * Force flush buffer for channel. | |
423 | */ | |
424 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
425 | { | |
426 | int ret; | |
427 | struct ltt_kernel_stream *stream; | |
428 | ||
429 | DBG("Flush buffer for channel %s", channel->channel->name); | |
430 | ||
431 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
432 | DBG("Flushing channel stream %d", stream->fd); | |
433 | ret = kernctl_buffer_flush(stream->fd); | |
434 | if (ret < 0) { | |
435 | perror("ioctl"); | |
436 | ERR("Fail to flush buffer for stream %d (ret: %d)", | |
437 | stream->fd, ret); | |
438 | } | |
439 | } | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
8c0faa1d DG |
444 | /* |
445 | * kernel_stop_session | |
446 | * | |
447 | * Stop tracing session. | |
448 | */ | |
449 | int kernel_stop_session(struct ltt_kernel_session *session) | |
450 | { | |
451 | int ret; | |
452 | ||
453 | ret = kernctl_stop_session(session->fd); | |
454 | if (ret < 0) { | |
455 | goto error; | |
456 | } | |
457 | ||
458 | DBG("Kernel session stopped"); | |
459 | ||
460 | return 0; | |
461 | ||
462 | error: | |
463 | return ret; | |
464 | } | |
465 | ||
466 | /* | |
f3ed775e | 467 | * kernel_open_channel_stream |
8c0faa1d | 468 | * |
f3ed775e | 469 | * Open stream of channel, register it to the kernel tracer and add it |
54012638 | 470 | * to the stream list of the channel. |
8c0faa1d DG |
471 | * |
472 | * Return the number of created stream. Else, a negative value. | |
473 | */ | |
f3ed775e | 474 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d DG |
475 | { |
476 | int ret; | |
477 | struct ltt_kernel_stream *lks; | |
478 | ||
479 | while ((ret = kernctl_create_stream(channel->fd)) > 0) { | |
54012638 | 480 | lks = trace_create_kernel_stream(); |
8c0faa1d | 481 | if (lks == NULL) { |
54012638 | 482 | close(ret); |
8c0faa1d DG |
483 | goto error; |
484 | } | |
485 | ||
486 | lks->fd = ret; | |
7b395890 DG |
487 | /* Prevent fd duplication after execlp() */ |
488 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
489 | if (ret < 0) { | |
490 | perror("fcntl session fd"); | |
491 | } | |
492 | ||
8e68d1c8 DG |
493 | ret = asprintf(&lks->pathname, "%s/%s_%d", |
494 | channel->pathname, channel->channel->name, channel->stream_count); | |
8c0faa1d DG |
495 | if (ret < 0) { |
496 | perror("asprintf kernel create stream"); | |
497 | goto error; | |
498 | } | |
8c0faa1d | 499 | |
54012638 | 500 | /* Add stream to channe stream list */ |
8c0faa1d DG |
501 | cds_list_add(&lks->list, &channel->stream_list.head); |
502 | channel->stream_count++; | |
8c0faa1d | 503 | |
54012638 DG |
504 | DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)", |
505 | channel->stream_count, lks->fd, lks->state, lks->pathname); | |
506 | } | |
8c0faa1d DG |
507 | |
508 | return channel->stream_count; | |
509 | ||
510 | error: | |
54012638 | 511 | return -1; |
8c0faa1d DG |
512 | } |
513 | ||
514 | /* | |
f3ed775e | 515 | * kernel_open_metadata_stream |
8c0faa1d | 516 | * |
f3ed775e | 517 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 518 | */ |
f3ed775e | 519 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
520 | { |
521 | int ret; | |
522 | ||
523 | ret = kernctl_create_stream(session->metadata->fd); | |
524 | if (ret < 0) { | |
525 | perror("kernel create metadata stream"); | |
8c0faa1d DG |
526 | goto error; |
527 | } | |
528 | ||
529 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
530 | session->metadata_stream_fd = ret; | |
7b395890 DG |
531 | /* Prevent fd duplication after execlp() */ |
532 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
533 | if (ret < 0) { | |
534 | perror("fcntl session fd"); | |
535 | } | |
aaf26714 DG |
536 | |
537 | return 0; | |
538 | ||
539 | error: | |
54012638 | 540 | return -1; |
aaf26714 | 541 | } |
2ef84c95 DG |
542 | |
543 | /* | |
544 | * kernel_list_events | |
545 | * | |
546 | * Get the event list from the kernel tracer and return that list in the CTF | |
547 | * format. | |
548 | */ | |
549 | ssize_t kernel_list_events(int tracer_fd, char **list) | |
550 | { | |
551 | int fd; | |
552 | char *buf, *line = NULL; | |
553 | size_t nb, nbmem, total = 0; | |
554 | ssize_t size; | |
555 | FILE *fp; | |
556 | ||
557 | fd = kernctl_tracepoint_list(tracer_fd); | |
558 | if (fd < 0) { | |
559 | perror("kernel tracepoint list"); | |
560 | goto error; | |
561 | } | |
562 | ||
563 | fp = fdopen(fd, "r"); | |
564 | if (fp == NULL) { | |
565 | perror("kernel tracepoint list fdopen"); | |
566 | goto error; | |
567 | } | |
568 | ||
569 | /* | |
570 | * Init memory size counter | |
571 | * See kernel-ctl.h for explanation of this value | |
572 | */ | |
573 | nbmem = KERNEL_EVENT_LIST_SIZE; | |
574 | buf = malloc(nbmem); | |
575 | ||
576 | while ((size = getline(&line, &nb, fp)) != -1) { | |
577 | if (total + size > nbmem) { | |
d686b40f | 578 | DBG("Reallocating event list from %zd to %zd bytes", nbmem, |
2ef84c95 DG |
579 | total + size + KERNEL_EVENT_LIST_SIZE); |
580 | /* Adding the default size again */ | |
581 | nbmem = total + size + KERNEL_EVENT_LIST_SIZE; | |
582 | buf = realloc(buf, nbmem); | |
583 | if (buf == NULL) { | |
584 | perror("realloc list events"); | |
585 | goto error; | |
586 | } | |
587 | } | |
588 | memcpy(buf + total, line, size); | |
589 | total += size; | |
590 | } | |
591 | ||
592 | *list = buf; | |
593 | ||
594 | DBG("Kernel list events done"); | |
595 | ||
596 | return total; | |
597 | ||
598 | error: | |
599 | return -1; | |
600 | } |