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); | |
cbbbb275 DG |
212 | channel->event_count++; |
213 | ||
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"); | |
7d29a247 DG |
286 | if (errno == EEXIST) { |
287 | ret = -EEXIST; | |
288 | } | |
19e70852 DG |
289 | goto error; |
290 | } | |
291 | ||
292 | event->enabled = 1; | |
293 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
294 | ||
295 | return 0; | |
296 | ||
297 | error: | |
d36b8583 | 298 | return ret; |
19e70852 DG |
299 | } |
300 | ||
e953ef25 DG |
301 | /* |
302 | * kernel_disable_event | |
303 | * | |
19e70852 | 304 | * Disable a kernel event. |
e953ef25 | 305 | */ |
19e70852 | 306 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
307 | { |
308 | int ret; | |
19e70852 DG |
309 | |
310 | ret = kernctl_disable(event->fd); | |
311 | if (ret < 0) { | |
312 | perror("disable event ioctl"); | |
313 | goto error; | |
e953ef25 | 314 | } |
f3ed775e | 315 | |
19e70852 DG |
316 | event->enabled = 0; |
317 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
318 | ||
f34daff7 DG |
319 | return 0; |
320 | ||
321 | error: | |
d36b8583 | 322 | return ret; |
f34daff7 | 323 | } |
aaf26714 DG |
324 | |
325 | /* | |
326 | * kernel_open_metadata | |
327 | * | |
54012638 DG |
328 | * Create kernel metadata, open from the kernel tracer and add it to the |
329 | * kernel session. | |
aaf26714 | 330 | */ |
58a97671 | 331 | int kernel_open_metadata(struct ltt_kernel_session *session, char *path) |
aaf26714 DG |
332 | { |
333 | int ret; | |
334 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 335 | |
54012638 | 336 | /* Allocate kernel metadata */ |
58a97671 | 337 | lkm = trace_create_kernel_metadata(path); |
54012638 | 338 | if (lkm == NULL) { |
aaf26714 DG |
339 | goto error; |
340 | } | |
341 | ||
54012638 | 342 | /* Kernel tracer metadata creation */ |
f3ed775e | 343 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
344 | if (ret < 0) { |
345 | goto error; | |
346 | } | |
347 | ||
8c0faa1d | 348 | lkm->fd = ret; |
7b395890 DG |
349 | /* Prevent fd duplication after execlp() */ |
350 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
351 | if (ret < 0) { | |
352 | perror("fcntl session fd"); | |
353 | } | |
354 | ||
aaf26714 | 355 | session->metadata = lkm; |
8c0faa1d | 356 | |
54012638 | 357 | DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname); |
8c0faa1d DG |
358 | |
359 | return 0; | |
360 | ||
361 | error: | |
54012638 | 362 | return -1; |
8c0faa1d DG |
363 | } |
364 | ||
365 | /* | |
366 | * kernel_start_session | |
367 | * | |
368 | * Start tracing session. | |
369 | */ | |
370 | int kernel_start_session(struct ltt_kernel_session *session) | |
371 | { | |
372 | int ret; | |
373 | ||
374 | ret = kernctl_start_session(session->fd); | |
375 | if (ret < 0) { | |
f3ed775e | 376 | perror("ioctl start session"); |
8c0faa1d DG |
377 | goto error; |
378 | } | |
379 | ||
380 | DBG("Kernel session started"); | |
381 | ||
382 | return 0; | |
383 | ||
384 | error: | |
385 | return ret; | |
386 | } | |
387 | ||
f3ed775e DG |
388 | /* |
389 | * kernel_wait_quiescent | |
390 | * | |
391 | * Make a kernel wait to make sure in-flight probe have completed. | |
392 | */ | |
393 | void kernel_wait_quiescent(int fd) | |
394 | { | |
395 | int ret; | |
396 | ||
397 | DBG("Kernel quiescent wait on %d", fd); | |
398 | ||
399 | ret = kernctl_wait_quiescent(fd); | |
400 | if (ret < 0) { | |
401 | perror("wait quiescent ioctl"); | |
402 | ERR("Kernel quiescent wait failed"); | |
403 | } | |
404 | } | |
405 | ||
406 | /* | |
407 | * kernel_metadata_flush_buffer | |
408 | * | |
409 | * Force flush buffer of metadata. | |
410 | */ | |
411 | int kernel_metadata_flush_buffer(int fd) | |
412 | { | |
413 | int ret; | |
414 | ||
415 | ret = kernctl_buffer_flush(fd); | |
416 | if (ret < 0) { | |
417 | ERR("Fail to flush metadata buffers %d (ret: %d", fd, ret); | |
418 | } | |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
423 | /* | |
424 | * kernel_flush_buffer | |
425 | * | |
426 | * Force flush buffer for channel. | |
427 | */ | |
428 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
429 | { | |
430 | int ret; | |
431 | struct ltt_kernel_stream *stream; | |
432 | ||
433 | DBG("Flush buffer for channel %s", channel->channel->name); | |
434 | ||
435 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
436 | DBG("Flushing channel stream %d", stream->fd); | |
437 | ret = kernctl_buffer_flush(stream->fd); | |
438 | if (ret < 0) { | |
439 | perror("ioctl"); | |
440 | ERR("Fail to flush buffer for stream %d (ret: %d)", | |
441 | stream->fd, ret); | |
442 | } | |
443 | } | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
8c0faa1d DG |
448 | /* |
449 | * kernel_stop_session | |
450 | * | |
451 | * Stop tracing session. | |
452 | */ | |
453 | int kernel_stop_session(struct ltt_kernel_session *session) | |
454 | { | |
455 | int ret; | |
456 | ||
457 | ret = kernctl_stop_session(session->fd); | |
458 | if (ret < 0) { | |
459 | goto error; | |
460 | } | |
461 | ||
462 | DBG("Kernel session stopped"); | |
463 | ||
464 | return 0; | |
465 | ||
466 | error: | |
467 | return ret; | |
468 | } | |
469 | ||
470 | /* | |
f3ed775e | 471 | * kernel_open_channel_stream |
8c0faa1d | 472 | * |
f3ed775e | 473 | * Open stream of channel, register it to the kernel tracer and add it |
54012638 | 474 | * to the stream list of the channel. |
8c0faa1d DG |
475 | * |
476 | * Return the number of created stream. Else, a negative value. | |
477 | */ | |
f3ed775e | 478 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d DG |
479 | { |
480 | int ret; | |
481 | struct ltt_kernel_stream *lks; | |
482 | ||
483 | while ((ret = kernctl_create_stream(channel->fd)) > 0) { | |
54012638 | 484 | lks = trace_create_kernel_stream(); |
8c0faa1d | 485 | if (lks == NULL) { |
54012638 | 486 | close(ret); |
8c0faa1d DG |
487 | goto error; |
488 | } | |
489 | ||
490 | lks->fd = ret; | |
7b395890 DG |
491 | /* Prevent fd duplication after execlp() */ |
492 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
493 | if (ret < 0) { | |
494 | perror("fcntl session fd"); | |
495 | } | |
496 | ||
8e68d1c8 DG |
497 | ret = asprintf(&lks->pathname, "%s/%s_%d", |
498 | channel->pathname, channel->channel->name, channel->stream_count); | |
8c0faa1d DG |
499 | if (ret < 0) { |
500 | perror("asprintf kernel create stream"); | |
501 | goto error; | |
502 | } | |
8c0faa1d | 503 | |
54012638 | 504 | /* Add stream to channe stream list */ |
8c0faa1d DG |
505 | cds_list_add(&lks->list, &channel->stream_list.head); |
506 | channel->stream_count++; | |
8c0faa1d | 507 | |
54012638 DG |
508 | DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)", |
509 | channel->stream_count, lks->fd, lks->state, lks->pathname); | |
510 | } | |
8c0faa1d DG |
511 | |
512 | return channel->stream_count; | |
513 | ||
514 | error: | |
54012638 | 515 | return -1; |
8c0faa1d DG |
516 | } |
517 | ||
518 | /* | |
f3ed775e | 519 | * kernel_open_metadata_stream |
8c0faa1d | 520 | * |
f3ed775e | 521 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 522 | */ |
f3ed775e | 523 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
524 | { |
525 | int ret; | |
526 | ||
527 | ret = kernctl_create_stream(session->metadata->fd); | |
528 | if (ret < 0) { | |
529 | perror("kernel create metadata stream"); | |
8c0faa1d DG |
530 | goto error; |
531 | } | |
532 | ||
533 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
534 | session->metadata_stream_fd = ret; | |
7b395890 DG |
535 | /* Prevent fd duplication after execlp() */ |
536 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
537 | if (ret < 0) { | |
538 | perror("fcntl session fd"); | |
539 | } | |
aaf26714 DG |
540 | |
541 | return 0; | |
542 | ||
543 | error: | |
54012638 | 544 | return -1; |
aaf26714 | 545 | } |
2ef84c95 DG |
546 | |
547 | /* | |
9f19cc17 | 548 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 549 | */ |
9f19cc17 | 550 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 551 | { |
9f19cc17 DG |
552 | int fd, pos; |
553 | char *event; | |
554 | size_t nbmem, count = 0; | |
2ef84c95 DG |
555 | ssize_t size; |
556 | FILE *fp; | |
9f19cc17 | 557 | struct lttng_event *elist; |
2ef84c95 DG |
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; | |
9f19cc17 | 576 | elist = malloc(sizeof(struct lttng_event) * nbmem); |
2ef84c95 | 577 | |
9f19cc17 DG |
578 | while ((size = fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { |
579 | if (count > nbmem) { | |
d686b40f | 580 | DBG("Reallocating event list from %zd to %zd bytes", nbmem, |
9f19cc17 | 581 | nbmem + KERNEL_EVENT_LIST_SIZE); |
2ef84c95 | 582 | /* Adding the default size again */ |
9f19cc17 DG |
583 | nbmem += KERNEL_EVENT_LIST_SIZE; |
584 | elist = realloc(elist, nbmem); | |
585 | if (elist == NULL) { | |
2ef84c95 DG |
586 | perror("realloc list events"); |
587 | goto error; | |
588 | } | |
589 | } | |
9f19cc17 DG |
590 | strncpy(elist[count].name, event, strlen(event)); |
591 | count++; | |
2ef84c95 DG |
592 | } |
593 | ||
9f19cc17 | 594 | *events = elist; |
2ef84c95 | 595 | |
9f19cc17 | 596 | DBG("Kernel list events done (%ld events)", count); |
2ef84c95 | 597 | |
9f19cc17 | 598 | return count; |
2ef84c95 DG |
599 | |
600 | error: | |
601 | return -1; | |
602 | } |