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