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) { | |
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"); | |
7d29a247 DG |
284 | if (errno == EEXIST) { |
285 | ret = -EEXIST; | |
286 | } | |
19e70852 DG |
287 | goto error; |
288 | } | |
289 | ||
290 | event->enabled = 1; | |
291 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
292 | ||
293 | return 0; | |
294 | ||
295 | error: | |
d36b8583 | 296 | return ret; |
19e70852 DG |
297 | } |
298 | ||
e953ef25 DG |
299 | /* |
300 | * kernel_disable_event | |
301 | * | |
19e70852 | 302 | * Disable a kernel event. |
e953ef25 | 303 | */ |
19e70852 | 304 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
305 | { |
306 | int ret; | |
19e70852 DG |
307 | |
308 | ret = kernctl_disable(event->fd); | |
309 | if (ret < 0) { | |
310 | perror("disable event ioctl"); | |
311 | goto error; | |
e953ef25 | 312 | } |
f3ed775e | 313 | |
19e70852 DG |
314 | event->enabled = 0; |
315 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
316 | ||
f34daff7 DG |
317 | return 0; |
318 | ||
319 | error: | |
d36b8583 | 320 | return ret; |
f34daff7 | 321 | } |
aaf26714 DG |
322 | |
323 | /* | |
324 | * kernel_open_metadata | |
325 | * | |
54012638 DG |
326 | * Create kernel metadata, open from the kernel tracer and add it to the |
327 | * kernel session. | |
aaf26714 | 328 | */ |
58a97671 | 329 | int kernel_open_metadata(struct ltt_kernel_session *session, char *path) |
aaf26714 DG |
330 | { |
331 | int ret; | |
332 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 333 | |
54012638 | 334 | /* Allocate kernel metadata */ |
58a97671 | 335 | lkm = trace_create_kernel_metadata(path); |
54012638 | 336 | if (lkm == NULL) { |
aaf26714 DG |
337 | goto error; |
338 | } | |
339 | ||
54012638 | 340 | /* Kernel tracer metadata creation */ |
f3ed775e | 341 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
342 | if (ret < 0) { |
343 | goto error; | |
344 | } | |
345 | ||
8c0faa1d | 346 | lkm->fd = ret; |
7b395890 DG |
347 | /* Prevent fd duplication after execlp() */ |
348 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
349 | if (ret < 0) { | |
350 | perror("fcntl session fd"); | |
351 | } | |
352 | ||
aaf26714 | 353 | session->metadata = lkm; |
8c0faa1d | 354 | |
54012638 | 355 | DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname); |
8c0faa1d DG |
356 | |
357 | return 0; | |
358 | ||
359 | error: | |
54012638 | 360 | return -1; |
8c0faa1d DG |
361 | } |
362 | ||
363 | /* | |
364 | * kernel_start_session | |
365 | * | |
366 | * Start tracing session. | |
367 | */ | |
368 | int kernel_start_session(struct ltt_kernel_session *session) | |
369 | { | |
370 | int ret; | |
371 | ||
372 | ret = kernctl_start_session(session->fd); | |
373 | if (ret < 0) { | |
f3ed775e | 374 | perror("ioctl start session"); |
8c0faa1d DG |
375 | goto error; |
376 | } | |
377 | ||
378 | DBG("Kernel session started"); | |
379 | ||
380 | return 0; | |
381 | ||
382 | error: | |
383 | return ret; | |
384 | } | |
385 | ||
f3ed775e DG |
386 | /* |
387 | * kernel_wait_quiescent | |
388 | * | |
389 | * Make a kernel wait to make sure in-flight probe have completed. | |
390 | */ | |
391 | void kernel_wait_quiescent(int fd) | |
392 | { | |
393 | int ret; | |
394 | ||
395 | DBG("Kernel quiescent wait on %d", fd); | |
396 | ||
397 | ret = kernctl_wait_quiescent(fd); | |
398 | if (ret < 0) { | |
399 | perror("wait quiescent ioctl"); | |
400 | ERR("Kernel quiescent wait failed"); | |
401 | } | |
402 | } | |
403 | ||
404 | /* | |
405 | * kernel_metadata_flush_buffer | |
406 | * | |
407 | * Force flush buffer of metadata. | |
408 | */ | |
409 | int kernel_metadata_flush_buffer(int fd) | |
410 | { | |
411 | int ret; | |
412 | ||
413 | ret = kernctl_buffer_flush(fd); | |
414 | if (ret < 0) { | |
415 | ERR("Fail to flush metadata buffers %d (ret: %d", fd, ret); | |
416 | } | |
417 | ||
418 | return 0; | |
419 | } | |
420 | ||
421 | /* | |
422 | * kernel_flush_buffer | |
423 | * | |
424 | * Force flush buffer for channel. | |
425 | */ | |
426 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
427 | { | |
428 | int ret; | |
429 | struct ltt_kernel_stream *stream; | |
430 | ||
431 | DBG("Flush buffer for channel %s", channel->channel->name); | |
432 | ||
433 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
434 | DBG("Flushing channel stream %d", stream->fd); | |
435 | ret = kernctl_buffer_flush(stream->fd); | |
436 | if (ret < 0) { | |
437 | perror("ioctl"); | |
438 | ERR("Fail to flush buffer for stream %d (ret: %d)", | |
439 | stream->fd, ret); | |
440 | } | |
441 | } | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
8c0faa1d DG |
446 | /* |
447 | * kernel_stop_session | |
448 | * | |
449 | * Stop tracing session. | |
450 | */ | |
451 | int kernel_stop_session(struct ltt_kernel_session *session) | |
452 | { | |
453 | int ret; | |
454 | ||
455 | ret = kernctl_stop_session(session->fd); | |
456 | if (ret < 0) { | |
457 | goto error; | |
458 | } | |
459 | ||
460 | DBG("Kernel session stopped"); | |
461 | ||
462 | return 0; | |
463 | ||
464 | error: | |
465 | return ret; | |
466 | } | |
467 | ||
468 | /* | |
f3ed775e | 469 | * kernel_open_channel_stream |
8c0faa1d | 470 | * |
f3ed775e | 471 | * Open stream of channel, register it to the kernel tracer and add it |
54012638 | 472 | * to the stream list of the channel. |
8c0faa1d DG |
473 | * |
474 | * Return the number of created stream. Else, a negative value. | |
475 | */ | |
f3ed775e | 476 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d DG |
477 | { |
478 | int ret; | |
479 | struct ltt_kernel_stream *lks; | |
480 | ||
481 | while ((ret = kernctl_create_stream(channel->fd)) > 0) { | |
54012638 | 482 | lks = trace_create_kernel_stream(); |
8c0faa1d | 483 | if (lks == NULL) { |
54012638 | 484 | close(ret); |
8c0faa1d DG |
485 | goto error; |
486 | } | |
487 | ||
488 | lks->fd = ret; | |
7b395890 DG |
489 | /* Prevent fd duplication after execlp() */ |
490 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
491 | if (ret < 0) { | |
492 | perror("fcntl session fd"); | |
493 | } | |
494 | ||
8e68d1c8 DG |
495 | ret = asprintf(&lks->pathname, "%s/%s_%d", |
496 | channel->pathname, channel->channel->name, channel->stream_count); | |
8c0faa1d DG |
497 | if (ret < 0) { |
498 | perror("asprintf kernel create stream"); | |
499 | goto error; | |
500 | } | |
8c0faa1d | 501 | |
54012638 | 502 | /* Add stream to channe stream list */ |
8c0faa1d DG |
503 | cds_list_add(&lks->list, &channel->stream_list.head); |
504 | channel->stream_count++; | |
8c0faa1d | 505 | |
54012638 DG |
506 | DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)", |
507 | channel->stream_count, lks->fd, lks->state, lks->pathname); | |
508 | } | |
8c0faa1d DG |
509 | |
510 | return channel->stream_count; | |
511 | ||
512 | error: | |
54012638 | 513 | return -1; |
8c0faa1d DG |
514 | } |
515 | ||
516 | /* | |
f3ed775e | 517 | * kernel_open_metadata_stream |
8c0faa1d | 518 | * |
f3ed775e | 519 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 520 | */ |
f3ed775e | 521 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
522 | { |
523 | int ret; | |
524 | ||
525 | ret = kernctl_create_stream(session->metadata->fd); | |
526 | if (ret < 0) { | |
527 | perror("kernel create metadata stream"); | |
8c0faa1d DG |
528 | goto error; |
529 | } | |
530 | ||
531 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
532 | session->metadata_stream_fd = ret; | |
7b395890 DG |
533 | /* Prevent fd duplication after execlp() */ |
534 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
535 | if (ret < 0) { | |
536 | perror("fcntl session fd"); | |
537 | } | |
aaf26714 DG |
538 | |
539 | return 0; | |
540 | ||
541 | error: | |
54012638 | 542 | return -1; |
aaf26714 | 543 | } |
2ef84c95 DG |
544 | |
545 | /* | |
546 | * kernel_list_events | |
547 | * | |
548 | * Get the event list from the kernel tracer and return that list in the CTF | |
549 | * format. | |
550 | */ | |
551 | ssize_t kernel_list_events(int tracer_fd, char **list) | |
552 | { | |
553 | int fd; | |
554 | char *buf, *line = NULL; | |
555 | size_t nb, nbmem, total = 0; | |
556 | ssize_t size; | |
557 | FILE *fp; | |
558 | ||
559 | fd = kernctl_tracepoint_list(tracer_fd); | |
560 | if (fd < 0) { | |
561 | perror("kernel tracepoint list"); | |
562 | goto error; | |
563 | } | |
564 | ||
565 | fp = fdopen(fd, "r"); | |
566 | if (fp == NULL) { | |
567 | perror("kernel tracepoint list fdopen"); | |
568 | goto error; | |
569 | } | |
570 | ||
571 | /* | |
572 | * Init memory size counter | |
573 | * See kernel-ctl.h for explanation of this value | |
574 | */ | |
575 | nbmem = KERNEL_EVENT_LIST_SIZE; | |
576 | buf = malloc(nbmem); | |
577 | ||
578 | while ((size = getline(&line, &nb, fp)) != -1) { | |
579 | if (total + size > nbmem) { | |
d686b40f | 580 | DBG("Reallocating event list from %zd to %zd bytes", nbmem, |
2ef84c95 DG |
581 | total + size + KERNEL_EVENT_LIST_SIZE); |
582 | /* Adding the default size again */ | |
583 | nbmem = total + size + KERNEL_EVENT_LIST_SIZE; | |
584 | buf = realloc(buf, nbmem); | |
585 | if (buf == NULL) { | |
586 | perror("realloc list events"); | |
587 | goto error; | |
588 | } | |
589 | } | |
590 | memcpy(buf + total, line, size); | |
591 | total += size; | |
592 | } | |
593 | ||
594 | *list = buf; | |
595 | ||
596 | DBG("Kernel list events done"); | |
597 | ||
598 | return total; | |
599 | ||
600 | error: | |
601 | return -1; | |
602 | } |