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" |
6dc3064a | 33 | #include "kernel-consumer.h" |
096102bd | 34 | #include "kern-modules.h" |
834978fd | 35 | #include "utils.h" |
20fe2104 | 36 | |
d65106b1 | 37 | /* |
050349bb | 38 | * Add context on a kernel channel. |
d65106b1 DG |
39 | */ |
40 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 41 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
42 | { |
43 | int ret; | |
44 | ||
0525e9ae DG |
45 | assert(chan); |
46 | assert(ctx); | |
47 | ||
d65106b1 | 48 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 49 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 50 | if (ret < 0) { |
b579acd9 | 51 | if (errno != EEXIST) { |
df0f840b | 52 | PERROR("add context ioctl"); |
b579acd9 DG |
53 | } else { |
54 | /* If EEXIST, we just ignore the error */ | |
55 | ret = 0; | |
56 | } | |
d65106b1 DG |
57 | goto error; |
58 | } | |
59 | ||
645328ae | 60 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
d65106b1 DG |
61 | |
62 | return 0; | |
63 | ||
64 | error: | |
65 | return ret; | |
66 | } | |
67 | ||
20fe2104 | 68 | /* |
050349bb DG |
69 | * Create a new kernel session, register it to the kernel tracer and add it to |
70 | * the session daemon session. | |
20fe2104 | 71 | */ |
8c0faa1d | 72 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
73 | { |
74 | int ret; | |
75 | struct ltt_kernel_session *lks; | |
76 | ||
0525e9ae DG |
77 | assert(session); |
78 | ||
54012638 | 79 | /* Allocate data structure */ |
dec56f6c | 80 | lks = trace_kernel_create_session(); |
20fe2104 | 81 | if (lks == NULL) { |
54012638 | 82 | ret = -1; |
20fe2104 DG |
83 | goto error; |
84 | } | |
85 | ||
54012638 | 86 | /* Kernel tracer session creation */ |
20fe2104 DG |
87 | ret = kernctl_create_session(tracer_fd); |
88 | if (ret < 0) { | |
df0f840b | 89 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
90 | goto error; |
91 | } | |
92 | ||
20fe2104 | 93 | lks->fd = ret; |
7b395890 DG |
94 | /* Prevent fd duplication after execlp() */ |
95 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
96 | if (ret < 0) { | |
df0f840b | 97 | PERROR("fcntl session fd"); |
7b395890 DG |
98 | } |
99 | ||
53632229 | 100 | lks->id = session->id; |
3bd1e081 | 101 | lks->consumer_fds_sent = 0; |
8c0faa1d | 102 | session->kernel_session = lks; |
8c0faa1d DG |
103 | |
104 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
105 | |
106 | return 0; | |
107 | ||
108 | error: | |
5f62c685 DG |
109 | if (lks) { |
110 | trace_kernel_destroy_session(lks); | |
111 | } | |
20fe2104 DG |
112 | return ret; |
113 | } | |
114 | ||
115 | /* | |
050349bb DG |
116 | * Create a kernel channel, register it to the kernel tracer and add it to the |
117 | * kernel session. | |
20fe2104 | 118 | */ |
050349bb | 119 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 120 | struct lttng_channel *chan) |
20fe2104 DG |
121 | { |
122 | int ret; | |
123 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 124 | |
0525e9ae DG |
125 | assert(session); |
126 | assert(chan); | |
0525e9ae | 127 | |
54012638 | 128 | /* Allocate kernel channel */ |
fdd9eb17 | 129 | lkc = trace_kernel_create_channel(chan); |
54012638 | 130 | if (lkc == NULL) { |
20fe2104 DG |
131 | goto error; |
132 | } | |
133 | ||
ecc48a90 | 134 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 135 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
136 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
137 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 138 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 139 | |
54012638 | 140 | /* Kernel tracer channel creation */ |
f3ed775e | 141 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 142 | if (ret < 0) { |
df0f840b | 143 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
144 | goto error; |
145 | } | |
146 | ||
54012638 | 147 | /* Setup the channel fd */ |
20fe2104 | 148 | lkc->fd = ret; |
7b395890 DG |
149 | /* Prevent fd duplication after execlp() */ |
150 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
151 | if (ret < 0) { | |
df0f840b | 152 | PERROR("fcntl session fd"); |
7b395890 DG |
153 | } |
154 | ||
54012638 | 155 | /* Add channel to session */ |
8c0faa1d DG |
156 | cds_list_add(&lkc->list, &session->channel_list.head); |
157 | session->channel_count++; | |
fb5f35b6 | 158 | lkc->session = session; |
20fe2104 | 159 | |
00e2e675 | 160 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
20fe2104 DG |
161 | |
162 | return 0; | |
163 | ||
164 | error: | |
5f62c685 DG |
165 | if (lkc) { |
166 | free(lkc->channel); | |
167 | free(lkc); | |
168 | } | |
54012638 | 169 | return -1; |
20fe2104 | 170 | } |
f34daff7 DG |
171 | |
172 | /* | |
050349bb DG |
173 | * Create a kernel event, enable it to the kernel tracer and add it to the |
174 | * channel event list of the kernel session. | |
f34daff7 | 175 | */ |
050349bb DG |
176 | int kernel_create_event(struct lttng_event *ev, |
177 | struct ltt_kernel_channel *channel) | |
f34daff7 DG |
178 | { |
179 | int ret; | |
180 | struct ltt_kernel_event *event; | |
f34daff7 | 181 | |
0525e9ae DG |
182 | assert(ev); |
183 | assert(channel); | |
184 | ||
62499ad6 | 185 | event = trace_kernel_create_event(ev); |
54012638 | 186 | if (event == NULL) { |
d87bfb32 | 187 | ret = -1; |
f34daff7 DG |
188 | goto error; |
189 | } | |
190 | ||
f3ed775e DG |
191 | ret = kernctl_create_event(channel->fd, event->event); |
192 | if (ret < 0) { | |
bd29c13d DG |
193 | switch (errno) { |
194 | case EEXIST: | |
195 | break; | |
196 | case ENOSYS: | |
197 | WARN("Event type not implemented"); | |
198 | break; | |
8197a339 DG |
199 | case ENOENT: |
200 | WARN("Event %s not found!", ev->name); | |
201 | break; | |
bd29c13d | 202 | default: |
d87bfb32 DG |
203 | PERROR("create event ioctl"); |
204 | } | |
205 | ret = -errno; | |
e953ef25 | 206 | goto free_event; |
8c0faa1d | 207 | } |
f34daff7 | 208 | |
5f822d0a | 209 | /* |
2c425ff7 | 210 | * LTTNG_KERNEL_SYSCALL event creation will return 0 on success. |
5f822d0a DG |
211 | */ |
212 | if (ret == 0 && event->event->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
213 | DBG2("Kernel event syscall creation success"); | |
87eb4ab8 MD |
214 | /* |
215 | * We use fd == -1 to ensure that we never trigger a close of fd | |
216 | * 0. | |
217 | */ | |
218 | event->fd = -1; | |
2c425ff7 | 219 | goto add_list; |
5f822d0a DG |
220 | } |
221 | ||
f3ed775e | 222 | event->fd = ret; |
7b395890 DG |
223 | /* Prevent fd duplication after execlp() */ |
224 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
225 | if (ret < 0) { | |
df0f840b | 226 | PERROR("fcntl session fd"); |
7b395890 DG |
227 | } |
228 | ||
2c425ff7 | 229 | add_list: |
f3ed775e DG |
230 | /* Add event to event list */ |
231 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
232 | channel->event_count++; |
233 | ||
e953ef25 DG |
234 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
235 | ||
236 | return 0; | |
237 | ||
238 | free_event: | |
239 | free(event); | |
240 | error: | |
d87bfb32 | 241 | return ret; |
e953ef25 DG |
242 | } |
243 | ||
26cc6b4e | 244 | /* |
050349bb | 245 | * Disable a kernel channel. |
26cc6b4e DG |
246 | */ |
247 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
248 | { | |
249 | int ret; | |
250 | ||
0525e9ae DG |
251 | assert(chan); |
252 | ||
26cc6b4e DG |
253 | ret = kernctl_disable(chan->fd); |
254 | if (ret < 0) { | |
df0f840b | 255 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
256 | ret = errno; |
257 | goto error; | |
258 | } | |
259 | ||
260 | chan->enabled = 0; | |
261 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
262 | ||
263 | return 0; | |
264 | ||
265 | error: | |
266 | return ret; | |
267 | } | |
268 | ||
d36b8583 | 269 | /* |
050349bb | 270 | * Enable a kernel channel. |
d36b8583 DG |
271 | */ |
272 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
273 | { | |
274 | int ret; | |
275 | ||
0525e9ae DG |
276 | assert(chan); |
277 | ||
d36b8583 | 278 | ret = kernctl_enable(chan->fd); |
54d01ffb | 279 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 280 | PERROR("Enable kernel chan"); |
d36b8583 DG |
281 | goto error; |
282 | } | |
283 | ||
284 | chan->enabled = 1; | |
285 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
286 | ||
287 | return 0; | |
288 | ||
289 | error: | |
290 | return ret; | |
291 | } | |
292 | ||
19e70852 | 293 | /* |
050349bb | 294 | * Enable a kernel event. |
19e70852 DG |
295 | */ |
296 | int kernel_enable_event(struct ltt_kernel_event *event) | |
297 | { | |
298 | int ret; | |
299 | ||
0525e9ae DG |
300 | assert(event); |
301 | ||
19e70852 | 302 | ret = kernctl_enable(event->fd); |
42224349 DG |
303 | if (ret < 0) { |
304 | switch (errno) { | |
305 | case EEXIST: | |
f73fabfd | 306 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
307 | break; |
308 | default: | |
309 | PERROR("enable kernel event"); | |
310 | break; | |
311 | } | |
19e70852 DG |
312 | goto error; |
313 | } | |
314 | ||
315 | event->enabled = 1; | |
316 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
317 | ||
318 | return 0; | |
319 | ||
320 | error: | |
d36b8583 | 321 | return ret; |
19e70852 DG |
322 | } |
323 | ||
e953ef25 | 324 | /* |
050349bb | 325 | * Disable a kernel event. |
e953ef25 | 326 | */ |
19e70852 | 327 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
328 | { |
329 | int ret; | |
19e70852 | 330 | |
0525e9ae DG |
331 | assert(event); |
332 | ||
19e70852 | 333 | ret = kernctl_disable(event->fd); |
42224349 DG |
334 | if (ret < 0) { |
335 | switch (errno) { | |
336 | case EEXIST: | |
f73fabfd | 337 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
338 | break; |
339 | default: | |
340 | PERROR("disable kernel event"); | |
341 | break; | |
342 | } | |
19e70852 | 343 | goto error; |
e953ef25 | 344 | } |
f3ed775e | 345 | |
19e70852 DG |
346 | event->enabled = 0; |
347 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
348 | ||
f34daff7 DG |
349 | return 0; |
350 | ||
351 | error: | |
d36b8583 | 352 | return ret; |
f34daff7 | 353 | } |
aaf26714 | 354 | |
6e911cad MD |
355 | int kernel_enable_syscall(const char *syscall_name, |
356 | struct ltt_kernel_channel *channel) | |
357 | { | |
358 | return kernctl_enable_syscall(channel->fd, syscall_name); | |
359 | } | |
360 | ||
361 | int kernel_disable_syscall(const char *syscall_name, | |
362 | struct ltt_kernel_channel *channel) | |
363 | { | |
364 | return kernctl_disable_syscall(channel->fd, syscall_name); | |
365 | } | |
366 | ||
aaf26714 | 367 | /* |
050349bb DG |
368 | * Create kernel metadata, open from the kernel tracer and add it to the |
369 | * kernel session. | |
aaf26714 | 370 | */ |
a4b92340 | 371 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
372 | { |
373 | int ret; | |
74024a21 | 374 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 375 | |
0525e9ae DG |
376 | assert(session); |
377 | ||
54012638 | 378 | /* Allocate kernel metadata */ |
a4b92340 | 379 | lkm = trace_kernel_create_metadata(); |
54012638 | 380 | if (lkm == NULL) { |
aaf26714 DG |
381 | goto error; |
382 | } | |
383 | ||
54012638 | 384 | /* Kernel tracer metadata creation */ |
f3ed775e | 385 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 386 | if (ret < 0) { |
74024a21 | 387 | goto error_open; |
aaf26714 DG |
388 | } |
389 | ||
8c0faa1d | 390 | lkm->fd = ret; |
7b395890 DG |
391 | /* Prevent fd duplication after execlp() */ |
392 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
393 | if (ret < 0) { | |
df0f840b | 394 | PERROR("fcntl session fd"); |
7b395890 DG |
395 | } |
396 | ||
aaf26714 | 397 | session->metadata = lkm; |
8c0faa1d | 398 | |
00e2e675 | 399 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
400 | |
401 | return 0; | |
402 | ||
74024a21 DG |
403 | error_open: |
404 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 405 | error: |
54012638 | 406 | return -1; |
8c0faa1d DG |
407 | } |
408 | ||
409 | /* | |
050349bb | 410 | * Start tracing session. |
8c0faa1d DG |
411 | */ |
412 | int kernel_start_session(struct ltt_kernel_session *session) | |
413 | { | |
414 | int ret; | |
415 | ||
0525e9ae DG |
416 | assert(session); |
417 | ||
8c0faa1d DG |
418 | ret = kernctl_start_session(session->fd); |
419 | if (ret < 0) { | |
df0f840b | 420 | PERROR("ioctl start session"); |
8c0faa1d DG |
421 | goto error; |
422 | } | |
423 | ||
424 | DBG("Kernel session started"); | |
425 | ||
426 | return 0; | |
427 | ||
428 | error: | |
429 | return ret; | |
430 | } | |
431 | ||
f3ed775e | 432 | /* |
050349bb | 433 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
434 | */ |
435 | void kernel_wait_quiescent(int fd) | |
436 | { | |
437 | int ret; | |
438 | ||
439 | DBG("Kernel quiescent wait on %d", fd); | |
440 | ||
441 | ret = kernctl_wait_quiescent(fd); | |
442 | if (ret < 0) { | |
df0f840b | 443 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
444 | ERR("Kernel quiescent wait failed"); |
445 | } | |
446 | } | |
447 | ||
d0254c7c | 448 | /* |
050349bb | 449 | * Kernel calibrate |
d0254c7c MD |
450 | */ |
451 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
452 | { | |
453 | int ret; | |
454 | ||
0525e9ae DG |
455 | assert(calibrate); |
456 | ||
d0254c7c MD |
457 | ret = kernctl_calibrate(fd, calibrate); |
458 | if (ret < 0) { | |
df0f840b | 459 | PERROR("calibrate ioctl"); |
d0254c7c MD |
460 | return -1; |
461 | } | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
466 | ||
f3ed775e | 467 | /* |
f3ed775e DG |
468 | * Force flush buffer of metadata. |
469 | */ | |
470 | int kernel_metadata_flush_buffer(int fd) | |
471 | { | |
472 | int ret; | |
473 | ||
169d2cb7 DG |
474 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
475 | ||
f3ed775e DG |
476 | ret = kernctl_buffer_flush(fd); |
477 | if (ret < 0) { | |
00e2e675 | 478 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
479 | } |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | /* | |
050349bb | 485 | * Force flush buffer for channel. |
f3ed775e DG |
486 | */ |
487 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
488 | { | |
489 | int ret; | |
490 | struct ltt_kernel_stream *stream; | |
491 | ||
0525e9ae DG |
492 | assert(channel); |
493 | ||
f3ed775e DG |
494 | DBG("Flush buffer for channel %s", channel->channel->name); |
495 | ||
496 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
497 | DBG("Flushing channel stream %d", stream->fd); | |
498 | ret = kernctl_buffer_flush(stream->fd); | |
499 | if (ret < 0) { | |
df0f840b | 500 | PERROR("ioctl"); |
f3ed775e DG |
501 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
502 | stream->fd, ret); | |
503 | } | |
504 | } | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
8c0faa1d | 509 | /* |
050349bb | 510 | * Stop tracing session. |
8c0faa1d DG |
511 | */ |
512 | int kernel_stop_session(struct ltt_kernel_session *session) | |
513 | { | |
514 | int ret; | |
515 | ||
0525e9ae DG |
516 | assert(session); |
517 | ||
8c0faa1d DG |
518 | ret = kernctl_stop_session(session->fd); |
519 | if (ret < 0) { | |
520 | goto error; | |
521 | } | |
522 | ||
523 | DBG("Kernel session stopped"); | |
524 | ||
525 | return 0; | |
526 | ||
527 | error: | |
528 | return ret; | |
529 | } | |
530 | ||
531 | /* | |
050349bb DG |
532 | * Open stream of channel, register it to the kernel tracer and add it |
533 | * to the stream list of the channel. | |
8c0faa1d | 534 | * |
050349bb | 535 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 536 | */ |
f3ed775e | 537 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 538 | { |
00e2e675 | 539 | int ret, count = 0; |
8c0faa1d DG |
540 | struct ltt_kernel_stream *lks; |
541 | ||
0525e9ae DG |
542 | assert(channel); |
543 | ||
5a47c6a2 | 544 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
00e2e675 | 545 | lks = trace_kernel_create_stream(channel->channel->name, count); |
8c0faa1d | 546 | if (lks == NULL) { |
799e2c4f MD |
547 | ret = close(ret); |
548 | if (ret) { | |
549 | PERROR("close"); | |
550 | } | |
8c0faa1d DG |
551 | goto error; |
552 | } | |
553 | ||
554 | lks->fd = ret; | |
7b395890 DG |
555 | /* Prevent fd duplication after execlp() */ |
556 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
557 | if (ret < 0) { | |
df0f840b | 558 | PERROR("fcntl session fd"); |
7b395890 DG |
559 | } |
560 | ||
1624d5b7 JD |
561 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
562 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
563 | ||
54012638 | 564 | /* Add stream to channe stream list */ |
8c0faa1d DG |
565 | cds_list_add(&lks->list, &channel->stream_list.head); |
566 | channel->stream_count++; | |
8c0faa1d | 567 | |
00e2e675 DG |
568 | /* Increment counter which represent CPU number. */ |
569 | count++; | |
570 | ||
571 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, | |
572 | lks->state); | |
54012638 | 573 | } |
8c0faa1d DG |
574 | |
575 | return channel->stream_count; | |
576 | ||
577 | error: | |
54012638 | 578 | return -1; |
8c0faa1d DG |
579 | } |
580 | ||
581 | /* | |
050349bb | 582 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 583 | */ |
f3ed775e | 584 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
585 | { |
586 | int ret; | |
587 | ||
0525e9ae DG |
588 | assert(session); |
589 | ||
8c0faa1d DG |
590 | ret = kernctl_create_stream(session->metadata->fd); |
591 | if (ret < 0) { | |
df0f840b | 592 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
593 | goto error; |
594 | } | |
595 | ||
596 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
597 | session->metadata_stream_fd = ret; | |
7b395890 DG |
598 | /* Prevent fd duplication after execlp() */ |
599 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
600 | if (ret < 0) { | |
df0f840b | 601 | PERROR("fcntl session fd"); |
7b395890 | 602 | } |
aaf26714 DG |
603 | |
604 | return 0; | |
605 | ||
606 | error: | |
54012638 | 607 | return -1; |
aaf26714 | 608 | } |
2ef84c95 DG |
609 | |
610 | /* | |
9f19cc17 | 611 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 612 | */ |
9f19cc17 | 613 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 614 | { |
53efb85a | 615 | int fd, ret; |
9f19cc17 DG |
616 | char *event; |
617 | size_t nbmem, count = 0; | |
2ef84c95 | 618 | FILE *fp; |
9f19cc17 | 619 | struct lttng_event *elist; |
2ef84c95 | 620 | |
0525e9ae DG |
621 | assert(events); |
622 | ||
2ef84c95 DG |
623 | fd = kernctl_tracepoint_list(tracer_fd); |
624 | if (fd < 0) { | |
df0f840b | 625 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
626 | goto error; |
627 | } | |
628 | ||
629 | fp = fdopen(fd, "r"); | |
630 | if (fp == NULL) { | |
df0f840b | 631 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 632 | goto error_fp; |
2ef84c95 DG |
633 | } |
634 | ||
635 | /* | |
636 | * Init memory size counter | |
637 | * See kernel-ctl.h for explanation of this value | |
638 | */ | |
6725fe19 | 639 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 640 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
641 | if (elist == NULL) { |
642 | PERROR("alloc list events"); | |
643 | count = -ENOMEM; | |
644 | goto end; | |
645 | } | |
2ef84c95 | 646 | |
53efb85a | 647 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 648 | if (count >= nbmem) { |
3b870559 | 649 | struct lttng_event *new_elist; |
53efb85a | 650 | size_t new_nbmem; |
3b870559 | 651 | |
53efb85a MD |
652 | new_nbmem = nbmem << 1; |
653 | DBG("Reallocating event list from %zu to %zu bytes", | |
654 | nbmem, new_nbmem); | |
655 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 656 | if (new_elist == NULL) { |
df0f840b | 657 | PERROR("realloc list events"); |
3b870559 MD |
658 | free(event); |
659 | free(elist); | |
61b73b12 MD |
660 | count = -ENOMEM; |
661 | goto end; | |
2ef84c95 | 662 | } |
53efb85a MD |
663 | /* Zero the new memory */ |
664 | memset(new_elist + nbmem, 0, | |
665 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
666 | nbmem = new_nbmem; | |
3b870559 | 667 | elist = new_elist; |
2ef84c95 | 668 | } |
99497cd0 MD |
669 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
670 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 671 | elist[count].enabled = -1; |
9f19cc17 | 672 | count++; |
3b870559 | 673 | free(event); |
2ef84c95 DG |
674 | } |
675 | ||
9f19cc17 | 676 | *events = elist; |
ced2f820 | 677 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 678 | end: |
799e2c4f MD |
679 | ret = fclose(fp); /* closes both fp and fd */ |
680 | if (ret) { | |
681 | PERROR("fclose"); | |
682 | } | |
9f19cc17 | 683 | return count; |
2ef84c95 | 684 | |
61b73b12 | 685 | error_fp: |
799e2c4f MD |
686 | ret = close(fd); |
687 | if (ret) { | |
688 | PERROR("close"); | |
689 | } | |
2ef84c95 DG |
690 | error: |
691 | return -1; | |
692 | } | |
096102bd DG |
693 | |
694 | /* | |
695 | * Get kernel version and validate it. | |
696 | */ | |
697 | int kernel_validate_version(int tracer_fd) | |
698 | { | |
699 | int ret; | |
700 | struct lttng_kernel_tracer_version version; | |
701 | ||
702 | ret = kernctl_tracer_version(tracer_fd, &version); | |
703 | if (ret < 0) { | |
704 | ERR("Failed at getting the lttng-modules version"); | |
705 | goto error; | |
706 | } | |
707 | ||
708 | /* Validate version */ | |
a62a6556 MD |
709 | if (version.major != KERN_MODULES_PRE_MAJOR |
710 | && version.major != KERN_MODULES_MAJOR) { | |
096102bd | 711 | goto error_version; |
096102bd DG |
712 | } |
713 | ||
a62a6556 | 714 | DBG2("Kernel tracer version validated (major version %d)", version.major); |
096102bd DG |
715 | return 0; |
716 | ||
717 | error_version: | |
5df0f285 | 718 | ERR("Kernel major version %d is not compatible (supporting <= %d)", |
a62a6556 | 719 | version.major, KERN_MODULES_MAJOR) |
096102bd DG |
720 | ret = -1; |
721 | ||
722 | error: | |
723 | return ret; | |
724 | } | |
335a95b7 MD |
725 | |
726 | /* | |
727 | * Kernel work-arounds called at the start of sessiond main(). | |
728 | */ | |
729 | int init_kernel_workarounds(void) | |
730 | { | |
8936c33a | 731 | int ret; |
335a95b7 MD |
732 | FILE *fp; |
733 | ||
734 | /* | |
735 | * boot_id needs to be read once before being used concurrently | |
736 | * to deal with a Linux kernel race. A fix is proposed for | |
737 | * upstream, but the work-around is needed for older kernels. | |
738 | */ | |
739 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
740 | if (!fp) { | |
741 | goto end_boot_id; | |
742 | } | |
743 | while (!feof(fp)) { | |
744 | char buf[37] = ""; | |
745 | ||
8936c33a DG |
746 | ret = fread(buf, 1, sizeof(buf), fp); |
747 | if (ret < 0) { | |
748 | /* Ignore error, we don't really care */ | |
749 | } | |
335a95b7 | 750 | } |
799e2c4f MD |
751 | ret = fclose(fp); |
752 | if (ret) { | |
753 | PERROR("fclose"); | |
754 | } | |
335a95b7 | 755 | end_boot_id: |
335a95b7 MD |
756 | return 0; |
757 | } | |
2f77fc4b DG |
758 | |
759 | /* | |
760 | * Complete teardown of a kernel session. | |
761 | */ | |
762 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
763 | { | |
764 | if (ksess == NULL) { | |
765 | DBG3("No kernel session when tearing down session"); | |
766 | return; | |
767 | } | |
768 | ||
769 | DBG("Tearing down kernel session"); | |
770 | ||
07b86b52 | 771 | /* |
15dc512a DG |
772 | * Destroy channels on the consumer if at least one FD has been sent and we |
773 | * are in no output mode because the streams are in *no* monitor mode so we | |
774 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 775 | */ |
15dc512a | 776 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
777 | int ret; |
778 | struct consumer_socket *socket; | |
779 | struct lttng_ht_iter iter; | |
780 | ||
781 | /* For each consumer socket. */ | |
782 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
783 | socket, node.node) { | |
784 | struct ltt_kernel_channel *chan; | |
785 | ||
786 | /* For each channel, ask the consumer to destroy it. */ | |
787 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
788 | ret = kernel_consumer_destroy_channel(socket, chan); | |
789 | if (ret < 0) { | |
790 | /* Consumer is probably dead. Use next socket. */ | |
791 | continue; | |
792 | } | |
793 | } | |
794 | } | |
795 | } | |
796 | ||
2f77fc4b DG |
797 | /* Close any relayd session */ |
798 | consumer_output_send_destroy_relayd(ksess->consumer); | |
799 | ||
800 | trace_kernel_destroy_session(ksess); | |
801 | } | |
fb5f35b6 DG |
802 | |
803 | /* | |
804 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
805 | */ | |
806 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
807 | { | |
808 | struct ltt_kernel_session *ksess = NULL; | |
809 | ||
810 | assert(kchan); | |
811 | assert(kchan->channel); | |
812 | ||
813 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
814 | ||
815 | /* Update channel count of associated session. */ | |
816 | if (kchan->session) { | |
817 | /* Keep pointer reference so we can update it after the destroy. */ | |
818 | ksess = kchan->session; | |
819 | } | |
820 | ||
821 | trace_kernel_destroy_channel(kchan); | |
822 | ||
823 | /* | |
824 | * At this point the kernel channel is not visible anymore. This is safe | |
825 | * since in order to work on a visible kernel session, the tracing session | |
826 | * lock (ltt_session.lock) MUST be acquired. | |
827 | */ | |
828 | if (ksess) { | |
829 | ksess->channel_count--; | |
830 | } | |
831 | } | |
6dc3064a DG |
832 | |
833 | /* | |
834 | * Take a snapshot for a given kernel session. | |
835 | * | |
2a06df8d | 836 | * Return 0 on success or else return a LTTNG_ERR code. |
6dc3064a DG |
837 | */ |
838 | int kernel_snapshot_record(struct ltt_kernel_session *ksess, | |
68808f4e | 839 | struct snapshot_output *output, int wait, uint64_t max_size_per_stream) |
6dc3064a | 840 | { |
2a06df8d | 841 | int err, ret, saved_metadata_fd; |
6dc3064a DG |
842 | struct consumer_socket *socket; |
843 | struct lttng_ht_iter iter; | |
844 | struct ltt_kernel_metadata *saved_metadata; | |
845 | ||
846 | assert(ksess); | |
847 | assert(ksess->consumer); | |
848 | assert(output); | |
849 | ||
850 | DBG("Kernel snapshot record started"); | |
851 | ||
852 | /* Save current metadata since the following calls will change it. */ | |
853 | saved_metadata = ksess->metadata; | |
854 | saved_metadata_fd = ksess->metadata_stream_fd; | |
855 | ||
856 | rcu_read_lock(); | |
857 | ||
858 | ret = kernel_open_metadata(ksess); | |
859 | if (ret < 0) { | |
860 | ret = LTTNG_ERR_KERN_META_FAIL; | |
861 | goto error; | |
862 | } | |
863 | ||
864 | ret = kernel_open_metadata_stream(ksess); | |
865 | if (ret < 0) { | |
866 | ret = LTTNG_ERR_KERN_META_FAIL; | |
867 | goto error_open_stream; | |
868 | } | |
869 | ||
870 | /* Send metadata to consumer and snapshot everything. */ | |
871 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
872 | socket, node.node) { | |
873 | struct consumer_output *saved_output; | |
874 | struct ltt_kernel_channel *chan; | |
6dc3064a DG |
875 | |
876 | /* | |
877 | * Temporarly switch consumer output for our snapshot output. As long | |
878 | * as the session lock is taken, this is safe. | |
879 | */ | |
880 | saved_output = ksess->consumer; | |
881 | ksess->consumer = output->consumer; | |
882 | ||
883 | pthread_mutex_lock(socket->lock); | |
884 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 885 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 886 | pthread_mutex_unlock(socket->lock); |
07b86b52 | 887 | /* Put back the saved consumer output into the session. */ |
6dc3064a DG |
888 | ksess->consumer = saved_output; |
889 | if (ret < 0) { | |
890 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
891 | goto error_consumer; | |
892 | } | |
893 | ||
894 | /* For each channel, ask the consumer to snapshot it. */ | |
895 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
07b86b52 | 896 | pthread_mutex_lock(socket->lock); |
6dc3064a | 897 | ret = consumer_snapshot_channel(socket, chan->fd, output, 0, |
5c786ded JD |
898 | ksess->uid, ksess->gid, |
899 | DEFAULT_KERNEL_TRACE_DIR, wait, | |
900 | max_size_per_stream); | |
07b86b52 | 901 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
902 | if (ret < 0) { |
903 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
2a06df8d DG |
904 | (void) kernel_consumer_destroy_metadata(socket, |
905 | ksess->metadata); | |
6dc3064a DG |
906 | goto error_consumer; |
907 | } | |
908 | } | |
909 | ||
910 | /* Snapshot metadata, */ | |
07b86b52 | 911 | pthread_mutex_lock(socket->lock); |
6dc3064a | 912 | ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output, |
5c786ded JD |
913 | 1, ksess->uid, ksess->gid, |
914 | DEFAULT_KERNEL_TRACE_DIR, wait, max_size_per_stream); | |
07b86b52 | 915 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
916 | if (ret < 0) { |
917 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
918 | goto error_consumer; | |
919 | } | |
07b86b52 JD |
920 | |
921 | /* | |
922 | * The metadata snapshot is done, ask the consumer to destroy it since | |
923 | * it's not monitored on the consumer side. | |
924 | */ | |
925 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
926 | } |
927 | ||
fac41e72 DG |
928 | ret = LTTNG_OK; |
929 | ||
6dc3064a DG |
930 | error_consumer: |
931 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
932 | err = close(ksess->metadata_stream_fd); |
933 | if (err < 0) { | |
6dc3064a DG |
934 | PERROR("close snapshot kernel"); |
935 | } | |
936 | ||
937 | error_open_stream: | |
938 | trace_kernel_destroy_metadata(ksess->metadata); | |
939 | error: | |
940 | /* Restore metadata state.*/ | |
941 | ksess->metadata = saved_metadata; | |
942 | ksess->metadata_stream_fd = saved_metadata_fd; | |
943 | ||
944 | rcu_read_unlock(); | |
945 | return ret; | |
946 | } | |
834978fd DG |
947 | |
948 | /* | |
949 | * Get the syscall mask array from the kernel tracer. | |
950 | * | |
951 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
952 | * be freed. | |
953 | */ | |
954 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
955 | { | |
956 | assert(syscall_mask); | |
957 | assert(nr_bits); | |
958 | ||
959 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
960 | } |