Commit | Line | Data |
---|---|---|
20fe2104 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
20fe2104 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
20fe2104 DG |
16 | */ |
17 | ||
8c0faa1d | 18 | #define _GNU_SOURCE |
20fe2104 | 19 | #include <errno.h> |
7b395890 | 20 | #include <fcntl.h> |
20fe2104 DG |
21 | #include <stdlib.h> |
22 | #include <stdio.h> | |
f34daff7 | 23 | #include <string.h> |
8c0faa1d | 24 | #include <unistd.h> |
77c7c900 | 25 | #include <inttypes.h> |
20fe2104 | 26 | |
990570ed | 27 | #include <common/common.h> |
db758600 | 28 | #include <common/kernel-ctl/kernel-ctl.h> |
42224349 | 29 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 30 | |
2f77fc4b | 31 | #include "consumer.h" |
4771f025 | 32 | #include "kernel.h" |
096102bd | 33 | #include "kern-modules.h" |
20fe2104 | 34 | |
d65106b1 | 35 | /* |
050349bb | 36 | * Add context on a kernel channel. |
d65106b1 DG |
37 | */ |
38 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
39 | struct lttng_kernel_context *ctx) | |
40 | { | |
41 | int ret; | |
42 | ||
43 | DBG("Adding context to channel %s", chan->channel->name); | |
44 | ret = kernctl_add_context(chan->fd, ctx); | |
45 | if (ret < 0) { | |
b579acd9 | 46 | if (errno != EEXIST) { |
df0f840b | 47 | PERROR("add context ioctl"); |
b579acd9 DG |
48 | } else { |
49 | /* If EEXIST, we just ignore the error */ | |
50 | ret = 0; | |
51 | } | |
d65106b1 DG |
52 | goto error; |
53 | } | |
54 | ||
ba7f0ae5 | 55 | chan->ctx = zmalloc(sizeof(struct lttng_kernel_context)); |
d65106b1 | 56 | if (chan->ctx == NULL) { |
df0f840b | 57 | PERROR("zmalloc event context"); |
d65106b1 DG |
58 | goto error; |
59 | } | |
60 | ||
61 | memcpy(chan->ctx, ctx, sizeof(struct lttng_kernel_context)); | |
62 | ||
63 | return 0; | |
64 | ||
65 | error: | |
66 | return ret; | |
67 | } | |
68 | ||
69 | /* | |
050349bb | 70 | * Add context on a kernel event. |
d65106b1 DG |
71 | */ |
72 | int kernel_add_event_context(struct ltt_kernel_event *event, | |
73 | struct lttng_kernel_context *ctx) | |
74 | { | |
75 | int ret; | |
76 | ||
77 | DBG("Adding context to event %s", event->event->name); | |
78 | ret = kernctl_add_context(event->fd, ctx); | |
79 | if (ret < 0) { | |
df0f840b | 80 | PERROR("add context ioctl"); |
d65106b1 DG |
81 | goto error; |
82 | } | |
83 | ||
ba7f0ae5 | 84 | event->ctx = zmalloc(sizeof(struct lttng_kernel_context)); |
d65106b1 | 85 | if (event->ctx == NULL) { |
df0f840b | 86 | PERROR("zmalloc event context"); |
d65106b1 DG |
87 | goto error; |
88 | } | |
89 | ||
90 | memcpy(event->ctx, ctx, sizeof(struct lttng_kernel_context)); | |
91 | ||
92 | return 0; | |
93 | ||
94 | error: | |
95 | return ret; | |
96 | } | |
97 | ||
20fe2104 | 98 | /* |
050349bb DG |
99 | * Create a new kernel session, register it to the kernel tracer and add it to |
100 | * the session daemon session. | |
20fe2104 | 101 | */ |
8c0faa1d | 102 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
103 | { |
104 | int ret; | |
105 | struct ltt_kernel_session *lks; | |
106 | ||
54012638 | 107 | /* Allocate data structure */ |
f9815039 | 108 | lks = trace_kernel_create_session(session->path); |
20fe2104 | 109 | if (lks == NULL) { |
54012638 | 110 | ret = -1; |
20fe2104 DG |
111 | goto error; |
112 | } | |
113 | ||
54012638 | 114 | /* Kernel tracer session creation */ |
20fe2104 DG |
115 | ret = kernctl_create_session(tracer_fd); |
116 | if (ret < 0) { | |
df0f840b | 117 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
118 | goto error; |
119 | } | |
120 | ||
20fe2104 | 121 | lks->fd = ret; |
7b395890 DG |
122 | /* Prevent fd duplication after execlp() */ |
123 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
124 | if (ret < 0) { | |
df0f840b | 125 | PERROR("fcntl session fd"); |
7b395890 DG |
126 | } |
127 | ||
3bd1e081 | 128 | lks->consumer_fds_sent = 0; |
8c0faa1d | 129 | session->kernel_session = lks; |
8c0faa1d DG |
130 | |
131 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
132 | |
133 | return 0; | |
134 | ||
135 | error: | |
136 | return ret; | |
137 | } | |
138 | ||
139 | /* | |
050349bb DG |
140 | * Create a kernel channel, register it to the kernel tracer and add it to the |
141 | * kernel session. | |
20fe2104 | 142 | */ |
050349bb DG |
143 | int kernel_create_channel(struct ltt_kernel_session *session, |
144 | struct lttng_channel *chan, char *path) | |
20fe2104 DG |
145 | { |
146 | int ret; | |
147 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 148 | |
54012638 | 149 | /* Allocate kernel channel */ |
62499ad6 | 150 | lkc = trace_kernel_create_channel(chan, path); |
54012638 | 151 | if (lkc == NULL) { |
20fe2104 DG |
152 | goto error; |
153 | } | |
154 | ||
77c7c900 | 155 | DBG3("Kernel create channel %s in %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d", |
173af62f DG |
156 | chan->name, path, lkc->channel->attr.overwrite, |
157 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, | |
158 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
159 | lkc->channel->attr.output); | |
160 | ||
54012638 | 161 | /* Kernel tracer channel creation */ |
f3ed775e | 162 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 163 | if (ret < 0) { |
df0f840b | 164 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
165 | goto error; |
166 | } | |
167 | ||
54012638 | 168 | /* Setup the channel fd */ |
20fe2104 | 169 | lkc->fd = ret; |
7b395890 DG |
170 | /* Prevent fd duplication after execlp() */ |
171 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
172 | if (ret < 0) { | |
df0f840b | 173 | PERROR("fcntl session fd"); |
7b395890 DG |
174 | } |
175 | ||
54012638 | 176 | /* Add channel to session */ |
8c0faa1d DG |
177 | cds_list_add(&lkc->list, &session->channel_list.head); |
178 | session->channel_count++; | |
20fe2104 | 179 | |
00e2e675 | 180 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
20fe2104 DG |
181 | |
182 | return 0; | |
183 | ||
184 | error: | |
54012638 | 185 | return -1; |
20fe2104 | 186 | } |
f34daff7 DG |
187 | |
188 | /* | |
050349bb DG |
189 | * Create a kernel event, enable it to the kernel tracer and add it to the |
190 | * channel event list of the kernel session. | |
f34daff7 | 191 | */ |
050349bb DG |
192 | int kernel_create_event(struct lttng_event *ev, |
193 | struct ltt_kernel_channel *channel) | |
f34daff7 DG |
194 | { |
195 | int ret; | |
196 | struct ltt_kernel_event *event; | |
f34daff7 | 197 | |
62499ad6 | 198 | event = trace_kernel_create_event(ev); |
54012638 | 199 | if (event == NULL) { |
d87bfb32 | 200 | ret = -1; |
f34daff7 DG |
201 | goto error; |
202 | } | |
203 | ||
f3ed775e DG |
204 | ret = kernctl_create_event(channel->fd, event->event); |
205 | if (ret < 0) { | |
bd29c13d DG |
206 | switch (errno) { |
207 | case EEXIST: | |
208 | break; | |
209 | case ENOSYS: | |
210 | WARN("Event type not implemented"); | |
211 | break; | |
212 | default: | |
d87bfb32 DG |
213 | PERROR("create event ioctl"); |
214 | } | |
215 | ret = -errno; | |
e953ef25 | 216 | goto free_event; |
8c0faa1d | 217 | } |
f34daff7 | 218 | |
5f822d0a | 219 | /* |
2c425ff7 | 220 | * LTTNG_KERNEL_SYSCALL event creation will return 0 on success. |
5f822d0a DG |
221 | */ |
222 | if (ret == 0 && event->event->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
223 | DBG2("Kernel event syscall creation success"); | |
87eb4ab8 MD |
224 | /* |
225 | * We use fd == -1 to ensure that we never trigger a close of fd | |
226 | * 0. | |
227 | */ | |
228 | event->fd = -1; | |
2c425ff7 | 229 | goto add_list; |
5f822d0a DG |
230 | } |
231 | ||
f3ed775e | 232 | event->fd = ret; |
7b395890 DG |
233 | /* Prevent fd duplication after execlp() */ |
234 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
235 | if (ret < 0) { | |
df0f840b | 236 | PERROR("fcntl session fd"); |
7b395890 DG |
237 | } |
238 | ||
2c425ff7 | 239 | add_list: |
f3ed775e DG |
240 | /* Add event to event list */ |
241 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
242 | channel->event_count++; |
243 | ||
e953ef25 DG |
244 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
245 | ||
246 | return 0; | |
247 | ||
248 | free_event: | |
249 | free(event); | |
250 | error: | |
d87bfb32 | 251 | return ret; |
e953ef25 DG |
252 | } |
253 | ||
26cc6b4e | 254 | /* |
050349bb | 255 | * Disable a kernel channel. |
26cc6b4e DG |
256 | */ |
257 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
258 | { | |
259 | int ret; | |
260 | ||
261 | ret = kernctl_disable(chan->fd); | |
262 | if (ret < 0) { | |
df0f840b | 263 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
264 | ret = errno; |
265 | goto error; | |
266 | } | |
267 | ||
268 | chan->enabled = 0; | |
269 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
270 | ||
271 | return 0; | |
272 | ||
273 | error: | |
274 | return ret; | |
275 | } | |
276 | ||
d36b8583 | 277 | /* |
050349bb | 278 | * Enable a kernel channel. |
d36b8583 DG |
279 | */ |
280 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
281 | { | |
282 | int ret; | |
283 | ||
284 | ret = kernctl_enable(chan->fd); | |
54d01ffb | 285 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 286 | PERROR("Enable kernel chan"); |
d36b8583 DG |
287 | goto error; |
288 | } | |
289 | ||
290 | chan->enabled = 1; | |
291 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
292 | ||
293 | return 0; | |
294 | ||
295 | error: | |
296 | return ret; | |
297 | } | |
298 | ||
19e70852 | 299 | /* |
050349bb | 300 | * Enable a kernel event. |
19e70852 DG |
301 | */ |
302 | int kernel_enable_event(struct ltt_kernel_event *event) | |
303 | { | |
304 | int ret; | |
305 | ||
306 | ret = kernctl_enable(event->fd); | |
42224349 DG |
307 | if (ret < 0) { |
308 | switch (errno) { | |
309 | case EEXIST: | |
310 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
311 | break; | |
312 | default: | |
313 | PERROR("enable kernel event"); | |
314 | break; | |
315 | } | |
19e70852 DG |
316 | goto error; |
317 | } | |
318 | ||
319 | event->enabled = 1; | |
320 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
321 | ||
322 | return 0; | |
323 | ||
324 | error: | |
d36b8583 | 325 | return ret; |
19e70852 DG |
326 | } |
327 | ||
e953ef25 | 328 | /* |
050349bb | 329 | * Disable a kernel event. |
e953ef25 | 330 | */ |
19e70852 | 331 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
332 | { |
333 | int ret; | |
19e70852 DG |
334 | |
335 | ret = kernctl_disable(event->fd); | |
42224349 DG |
336 | if (ret < 0) { |
337 | switch (errno) { | |
338 | case EEXIST: | |
339 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
340 | break; | |
341 | default: | |
342 | PERROR("disable kernel event"); | |
343 | break; | |
344 | } | |
19e70852 | 345 | goto error; |
e953ef25 | 346 | } |
f3ed775e | 347 | |
19e70852 DG |
348 | event->enabled = 0; |
349 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
350 | ||
f34daff7 DG |
351 | return 0; |
352 | ||
353 | error: | |
d36b8583 | 354 | return ret; |
f34daff7 | 355 | } |
aaf26714 DG |
356 | |
357 | /* | |
050349bb DG |
358 | * Create kernel metadata, open from the kernel tracer and add it to the |
359 | * kernel session. | |
aaf26714 | 360 | */ |
a4b92340 | 361 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
362 | { |
363 | int ret; | |
364 | struct ltt_kernel_metadata *lkm; | |
aaf26714 | 365 | |
54012638 | 366 | /* Allocate kernel metadata */ |
a4b92340 | 367 | lkm = trace_kernel_create_metadata(); |
54012638 | 368 | if (lkm == NULL) { |
aaf26714 DG |
369 | goto error; |
370 | } | |
371 | ||
54012638 | 372 | /* Kernel tracer metadata creation */ |
f3ed775e | 373 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 DG |
374 | if (ret < 0) { |
375 | goto error; | |
376 | } | |
377 | ||
8c0faa1d | 378 | lkm->fd = ret; |
7b395890 DG |
379 | /* Prevent fd duplication after execlp() */ |
380 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
381 | if (ret < 0) { | |
df0f840b | 382 | PERROR("fcntl session fd"); |
7b395890 DG |
383 | } |
384 | ||
aaf26714 | 385 | session->metadata = lkm; |
8c0faa1d | 386 | |
00e2e675 | 387 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
388 | |
389 | return 0; | |
390 | ||
391 | error: | |
54012638 | 392 | return -1; |
8c0faa1d DG |
393 | } |
394 | ||
395 | /* | |
050349bb | 396 | * Start tracing session. |
8c0faa1d DG |
397 | */ |
398 | int kernel_start_session(struct ltt_kernel_session *session) | |
399 | { | |
400 | int ret; | |
401 | ||
402 | ret = kernctl_start_session(session->fd); | |
403 | if (ret < 0) { | |
df0f840b | 404 | PERROR("ioctl start session"); |
8c0faa1d DG |
405 | goto error; |
406 | } | |
407 | ||
408 | DBG("Kernel session started"); | |
409 | ||
410 | return 0; | |
411 | ||
412 | error: | |
413 | return ret; | |
414 | } | |
415 | ||
f3ed775e | 416 | /* |
050349bb | 417 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
418 | */ |
419 | void kernel_wait_quiescent(int fd) | |
420 | { | |
421 | int ret; | |
422 | ||
423 | DBG("Kernel quiescent wait on %d", fd); | |
424 | ||
425 | ret = kernctl_wait_quiescent(fd); | |
426 | if (ret < 0) { | |
df0f840b | 427 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
428 | ERR("Kernel quiescent wait failed"); |
429 | } | |
430 | } | |
431 | ||
d0254c7c | 432 | /* |
050349bb | 433 | * Kernel calibrate |
d0254c7c MD |
434 | */ |
435 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
436 | { | |
437 | int ret; | |
438 | ||
439 | ret = kernctl_calibrate(fd, calibrate); | |
440 | if (ret < 0) { | |
df0f840b | 441 | PERROR("calibrate ioctl"); |
d0254c7c MD |
442 | return -1; |
443 | } | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
448 | ||
f3ed775e | 449 | /* |
f3ed775e DG |
450 | * Force flush buffer of metadata. |
451 | */ | |
452 | int kernel_metadata_flush_buffer(int fd) | |
453 | { | |
454 | int ret; | |
455 | ||
456 | ret = kernctl_buffer_flush(fd); | |
457 | if (ret < 0) { | |
00e2e675 | 458 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
459 | } |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | /* | |
050349bb | 465 | * Force flush buffer for channel. |
f3ed775e DG |
466 | */ |
467 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
468 | { | |
469 | int ret; | |
470 | struct ltt_kernel_stream *stream; | |
471 | ||
472 | DBG("Flush buffer for channel %s", channel->channel->name); | |
473 | ||
474 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
475 | DBG("Flushing channel stream %d", stream->fd); | |
476 | ret = kernctl_buffer_flush(stream->fd); | |
477 | if (ret < 0) { | |
df0f840b | 478 | PERROR("ioctl"); |
f3ed775e DG |
479 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
480 | stream->fd, ret); | |
481 | } | |
482 | } | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
8c0faa1d | 487 | /* |
050349bb | 488 | * Stop tracing session. |
8c0faa1d DG |
489 | */ |
490 | int kernel_stop_session(struct ltt_kernel_session *session) | |
491 | { | |
492 | int ret; | |
493 | ||
494 | ret = kernctl_stop_session(session->fd); | |
495 | if (ret < 0) { | |
496 | goto error; | |
497 | } | |
498 | ||
499 | DBG("Kernel session stopped"); | |
500 | ||
501 | return 0; | |
502 | ||
503 | error: | |
504 | return ret; | |
505 | } | |
506 | ||
507 | /* | |
050349bb DG |
508 | * Open stream of channel, register it to the kernel tracer and add it |
509 | * to the stream list of the channel. | |
8c0faa1d | 510 | * |
050349bb | 511 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 512 | */ |
f3ed775e | 513 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 514 | { |
00e2e675 | 515 | int ret, count = 0; |
8c0faa1d DG |
516 | struct ltt_kernel_stream *lks; |
517 | ||
5a47c6a2 | 518 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
00e2e675 | 519 | lks = trace_kernel_create_stream(channel->channel->name, count); |
8c0faa1d | 520 | if (lks == NULL) { |
799e2c4f MD |
521 | ret = close(ret); |
522 | if (ret) { | |
523 | PERROR("close"); | |
524 | } | |
8c0faa1d DG |
525 | goto error; |
526 | } | |
527 | ||
528 | lks->fd = ret; | |
7b395890 DG |
529 | /* Prevent fd duplication after execlp() */ |
530 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
531 | if (ret < 0) { | |
df0f840b | 532 | PERROR("fcntl session fd"); |
7b395890 DG |
533 | } |
534 | ||
54012638 | 535 | /* Add stream to channe stream list */ |
8c0faa1d DG |
536 | cds_list_add(&lks->list, &channel->stream_list.head); |
537 | channel->stream_count++; | |
8c0faa1d | 538 | |
00e2e675 DG |
539 | /* Increment counter which represent CPU number. */ |
540 | count++; | |
541 | ||
542 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, | |
543 | lks->state); | |
54012638 | 544 | } |
8c0faa1d DG |
545 | |
546 | return channel->stream_count; | |
547 | ||
548 | error: | |
54012638 | 549 | return -1; |
8c0faa1d DG |
550 | } |
551 | ||
552 | /* | |
050349bb | 553 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 554 | */ |
f3ed775e | 555 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
556 | { |
557 | int ret; | |
558 | ||
559 | ret = kernctl_create_stream(session->metadata->fd); | |
560 | if (ret < 0) { | |
df0f840b | 561 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
562 | goto error; |
563 | } | |
564 | ||
565 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
566 | session->metadata_stream_fd = ret; | |
7b395890 DG |
567 | /* Prevent fd duplication after execlp() */ |
568 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
569 | if (ret < 0) { | |
df0f840b | 570 | PERROR("fcntl session fd"); |
7b395890 | 571 | } |
aaf26714 DG |
572 | |
573 | return 0; | |
574 | ||
575 | error: | |
54012638 | 576 | return -1; |
aaf26714 | 577 | } |
2ef84c95 DG |
578 | |
579 | /* | |
9f19cc17 | 580 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 581 | */ |
9f19cc17 | 582 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 583 | { |
799e2c4f | 584 | int fd, pos, ret; |
9f19cc17 DG |
585 | char *event; |
586 | size_t nbmem, count = 0; | |
2ef84c95 DG |
587 | ssize_t size; |
588 | FILE *fp; | |
9f19cc17 | 589 | struct lttng_event *elist; |
2ef84c95 DG |
590 | |
591 | fd = kernctl_tracepoint_list(tracer_fd); | |
592 | if (fd < 0) { | |
df0f840b | 593 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
594 | goto error; |
595 | } | |
596 | ||
597 | fp = fdopen(fd, "r"); | |
598 | if (fp == NULL) { | |
df0f840b | 599 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 600 | goto error_fp; |
2ef84c95 DG |
601 | } |
602 | ||
603 | /* | |
604 | * Init memory size counter | |
605 | * See kernel-ctl.h for explanation of this value | |
606 | */ | |
6725fe19 | 607 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 608 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
609 | if (elist == NULL) { |
610 | PERROR("alloc list events"); | |
611 | count = -ENOMEM; | |
612 | goto end; | |
613 | } | |
2ef84c95 | 614 | |
9f19cc17 | 615 | while ((size = fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { |
6725fe19 | 616 | if (count >= nbmem) { |
3b870559 MD |
617 | struct lttng_event *new_elist; |
618 | ||
ced2f820 | 619 | DBG("Reallocating event list from %zu to %zu bytes", nbmem, |
6725fe19 DG |
620 | nbmem * 2); |
621 | /* Double the size */ | |
622 | nbmem <<= 1; | |
3b870559 MD |
623 | new_elist = realloc(elist, nbmem * sizeof(struct lttng_event)); |
624 | if (new_elist == NULL) { | |
df0f840b | 625 | PERROR("realloc list events"); |
3b870559 MD |
626 | free(event); |
627 | free(elist); | |
61b73b12 MD |
628 | count = -ENOMEM; |
629 | goto end; | |
2ef84c95 | 630 | } |
3b870559 | 631 | elist = new_elist; |
2ef84c95 | 632 | } |
99497cd0 MD |
633 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
634 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 635 | elist[count].enabled = -1; |
9f19cc17 | 636 | count++; |
3b870559 | 637 | free(event); |
2ef84c95 DG |
638 | } |
639 | ||
9f19cc17 | 640 | *events = elist; |
ced2f820 | 641 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 642 | end: |
799e2c4f MD |
643 | ret = fclose(fp); /* closes both fp and fd */ |
644 | if (ret) { | |
645 | PERROR("fclose"); | |
646 | } | |
9f19cc17 | 647 | return count; |
2ef84c95 | 648 | |
61b73b12 | 649 | error_fp: |
799e2c4f MD |
650 | ret = close(fd); |
651 | if (ret) { | |
652 | PERROR("close"); | |
653 | } | |
2ef84c95 DG |
654 | error: |
655 | return -1; | |
656 | } | |
096102bd DG |
657 | |
658 | /* | |
659 | * Get kernel version and validate it. | |
660 | */ | |
661 | int kernel_validate_version(int tracer_fd) | |
662 | { | |
663 | int ret; | |
664 | struct lttng_kernel_tracer_version version; | |
665 | ||
666 | ret = kernctl_tracer_version(tracer_fd, &version); | |
667 | if (ret < 0) { | |
668 | ERR("Failed at getting the lttng-modules version"); | |
669 | goto error; | |
670 | } | |
671 | ||
672 | /* Validate version */ | |
a62a6556 MD |
673 | if (version.major != KERN_MODULES_PRE_MAJOR |
674 | && version.major != KERN_MODULES_MAJOR) { | |
096102bd | 675 | goto error_version; |
096102bd DG |
676 | } |
677 | ||
a62a6556 | 678 | DBG2("Kernel tracer version validated (major version %d)", version.major); |
096102bd DG |
679 | return 0; |
680 | ||
681 | error_version: | |
5df0f285 | 682 | ERR("Kernel major version %d is not compatible (supporting <= %d)", |
a62a6556 | 683 | version.major, KERN_MODULES_MAJOR) |
096102bd DG |
684 | ret = -1; |
685 | ||
686 | error: | |
687 | return ret; | |
688 | } | |
335a95b7 MD |
689 | |
690 | /* | |
691 | * Kernel work-arounds called at the start of sessiond main(). | |
692 | */ | |
693 | int init_kernel_workarounds(void) | |
694 | { | |
8936c33a | 695 | int ret; |
335a95b7 MD |
696 | FILE *fp; |
697 | ||
698 | /* | |
699 | * boot_id needs to be read once before being used concurrently | |
700 | * to deal with a Linux kernel race. A fix is proposed for | |
701 | * upstream, but the work-around is needed for older kernels. | |
702 | */ | |
703 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
704 | if (!fp) { | |
705 | goto end_boot_id; | |
706 | } | |
707 | while (!feof(fp)) { | |
708 | char buf[37] = ""; | |
709 | ||
8936c33a DG |
710 | ret = fread(buf, 1, sizeof(buf), fp); |
711 | if (ret < 0) { | |
712 | /* Ignore error, we don't really care */ | |
713 | } | |
335a95b7 | 714 | } |
799e2c4f MD |
715 | ret = fclose(fp); |
716 | if (ret) { | |
717 | PERROR("fclose"); | |
718 | } | |
335a95b7 | 719 | end_boot_id: |
335a95b7 MD |
720 | return 0; |
721 | } | |
2f77fc4b DG |
722 | |
723 | /* | |
724 | * Complete teardown of a kernel session. | |
725 | */ | |
726 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
727 | { | |
728 | if (ksess == NULL) { | |
729 | DBG3("No kernel session when tearing down session"); | |
730 | return; | |
731 | } | |
732 | ||
733 | DBG("Tearing down kernel session"); | |
734 | ||
735 | /* Close any relayd session */ | |
736 | consumer_output_send_destroy_relayd(ksess->consumer); | |
737 | ||
738 | trace_kernel_destroy_session(ksess); | |
739 | } |