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 |
6c1c0768 | 19 | #define _LGPL_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> |
77c7c900 | 26 | #include <inttypes.h> |
20fe2104 | 27 | |
990570ed | 28 | #include <common/common.h> |
db758600 | 29 | #include <common/kernel-ctl/kernel-ctl.h> |
c052142c | 30 | #include <common/kernel-ctl/kernel-ioctl.h> |
42224349 | 31 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 32 | |
2f77fc4b | 33 | #include "consumer.h" |
4771f025 | 34 | #include "kernel.h" |
6dc3064a | 35 | #include "kernel-consumer.h" |
096102bd | 36 | #include "kern-modules.h" |
834978fd | 37 | #include "utils.h" |
20fe2104 | 38 | |
d65106b1 | 39 | /* |
050349bb | 40 | * Add context on a kernel channel. |
d65106b1 DG |
41 | */ |
42 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 43 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
44 | { |
45 | int ret; | |
46 | ||
0525e9ae DG |
47 | assert(chan); |
48 | assert(ctx); | |
49 | ||
d65106b1 | 50 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 51 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 52 | if (ret < 0) { |
b579acd9 | 53 | if (errno != EEXIST) { |
df0f840b | 54 | PERROR("add context ioctl"); |
b579acd9 DG |
55 | } else { |
56 | /* If EEXIST, we just ignore the error */ | |
57 | ret = 0; | |
58 | } | |
d65106b1 DG |
59 | goto error; |
60 | } | |
61 | ||
645328ae | 62 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
d65106b1 DG |
63 | |
64 | return 0; | |
65 | ||
66 | error: | |
67 | return ret; | |
68 | } | |
69 | ||
20fe2104 | 70 | /* |
050349bb DG |
71 | * Create a new kernel session, register it to the kernel tracer and add it to |
72 | * the session daemon session. | |
20fe2104 | 73 | */ |
8c0faa1d | 74 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
75 | { |
76 | int ret; | |
77 | struct ltt_kernel_session *lks; | |
78 | ||
0525e9ae DG |
79 | assert(session); |
80 | ||
54012638 | 81 | /* Allocate data structure */ |
dec56f6c | 82 | lks = trace_kernel_create_session(); |
20fe2104 | 83 | if (lks == NULL) { |
54012638 | 84 | ret = -1; |
20fe2104 DG |
85 | goto error; |
86 | } | |
87 | ||
54012638 | 88 | /* Kernel tracer session creation */ |
20fe2104 DG |
89 | ret = kernctl_create_session(tracer_fd); |
90 | if (ret < 0) { | |
df0f840b | 91 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
92 | goto error; |
93 | } | |
94 | ||
20fe2104 | 95 | lks->fd = ret; |
7b395890 DG |
96 | /* Prevent fd duplication after execlp() */ |
97 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
98 | if (ret < 0) { | |
df0f840b | 99 | PERROR("fcntl session fd"); |
7b395890 DG |
100 | } |
101 | ||
53632229 | 102 | lks->id = session->id; |
3bd1e081 | 103 | lks->consumer_fds_sent = 0; |
8c0faa1d | 104 | session->kernel_session = lks; |
8c0faa1d DG |
105 | |
106 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
107 | |
108 | return 0; | |
109 | ||
110 | error: | |
5f62c685 DG |
111 | if (lks) { |
112 | trace_kernel_destroy_session(lks); | |
113 | } | |
20fe2104 DG |
114 | return ret; |
115 | } | |
116 | ||
117 | /* | |
050349bb DG |
118 | * Create a kernel channel, register it to the kernel tracer and add it to the |
119 | * kernel session. | |
20fe2104 | 120 | */ |
050349bb | 121 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 122 | struct lttng_channel *chan) |
20fe2104 DG |
123 | { |
124 | int ret; | |
125 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 126 | |
0525e9ae DG |
127 | assert(session); |
128 | assert(chan); | |
0525e9ae | 129 | |
54012638 | 130 | /* Allocate kernel channel */ |
fdd9eb17 | 131 | lkc = trace_kernel_create_channel(chan); |
54012638 | 132 | if (lkc == NULL) { |
20fe2104 DG |
133 | goto error; |
134 | } | |
135 | ||
ecc48a90 | 136 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 137 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
138 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
139 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 140 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 141 | |
54012638 | 142 | /* Kernel tracer channel creation */ |
f3ed775e | 143 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 144 | if (ret < 0) { |
df0f840b | 145 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
146 | goto error; |
147 | } | |
148 | ||
54012638 | 149 | /* Setup the channel fd */ |
20fe2104 | 150 | lkc->fd = ret; |
7b395890 DG |
151 | /* Prevent fd duplication after execlp() */ |
152 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
153 | if (ret < 0) { | |
df0f840b | 154 | PERROR("fcntl session fd"); |
7b395890 DG |
155 | } |
156 | ||
54012638 | 157 | /* Add channel to session */ |
8c0faa1d DG |
158 | cds_list_add(&lkc->list, &session->channel_list.head); |
159 | session->channel_count++; | |
fb5f35b6 | 160 | lkc->session = session; |
20fe2104 | 161 | |
00e2e675 | 162 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
20fe2104 DG |
163 | |
164 | return 0; | |
165 | ||
166 | error: | |
5f62c685 DG |
167 | if (lkc) { |
168 | free(lkc->channel); | |
169 | free(lkc); | |
170 | } | |
54012638 | 171 | return -1; |
20fe2104 | 172 | } |
f34daff7 DG |
173 | |
174 | /* | |
050349bb DG |
175 | * Create a kernel event, enable it to the kernel tracer and add it to the |
176 | * channel event list of the kernel session. | |
49d21f93 | 177 | * We own filter_expression and filter. |
f34daff7 | 178 | */ |
050349bb DG |
179 | int kernel_create_event(struct lttng_event *ev, |
180 | struct ltt_kernel_channel *channel) | |
f34daff7 DG |
181 | { |
182 | int ret; | |
183 | struct ltt_kernel_event *event; | |
f34daff7 | 184 | |
0525e9ae DG |
185 | assert(ev); |
186 | assert(channel); | |
187 | ||
62499ad6 | 188 | event = trace_kernel_create_event(ev); |
54012638 | 189 | if (event == NULL) { |
d87bfb32 | 190 | ret = -1; |
f34daff7 DG |
191 | goto error; |
192 | } | |
193 | ||
f3ed775e DG |
194 | ret = kernctl_create_event(channel->fd, event->event); |
195 | if (ret < 0) { | |
bd29c13d DG |
196 | switch (errno) { |
197 | case EEXIST: | |
198 | break; | |
199 | case ENOSYS: | |
200 | WARN("Event type not implemented"); | |
201 | break; | |
8197a339 DG |
202 | case ENOENT: |
203 | WARN("Event %s not found!", ev->name); | |
204 | break; | |
bd29c13d | 205 | default: |
d87bfb32 DG |
206 | PERROR("create event ioctl"); |
207 | } | |
208 | ret = -errno; | |
e953ef25 | 209 | goto free_event; |
8c0faa1d | 210 | } |
f34daff7 | 211 | |
5f822d0a | 212 | /* |
2c425ff7 | 213 | * LTTNG_KERNEL_SYSCALL event creation will return 0 on success. |
5f822d0a DG |
214 | */ |
215 | if (ret == 0 && event->event->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
216 | DBG2("Kernel event syscall creation success"); | |
87eb4ab8 MD |
217 | /* |
218 | * We use fd == -1 to ensure that we never trigger a close of fd | |
219 | * 0. | |
220 | */ | |
221 | event->fd = -1; | |
2c425ff7 | 222 | goto add_list; |
5f822d0a DG |
223 | } |
224 | ||
f3ed775e | 225 | event->fd = ret; |
7b395890 DG |
226 | /* Prevent fd duplication after execlp() */ |
227 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
228 | if (ret < 0) { | |
df0f840b | 229 | PERROR("fcntl session fd"); |
7b395890 DG |
230 | } |
231 | ||
2c425ff7 | 232 | add_list: |
f3ed775e DG |
233 | /* Add event to event list */ |
234 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
235 | channel->event_count++; |
236 | ||
e953ef25 DG |
237 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
238 | ||
239 | return 0; | |
240 | ||
241 | free_event: | |
242 | free(event); | |
243 | error: | |
d87bfb32 | 244 | return ret; |
e953ef25 DG |
245 | } |
246 | ||
26cc6b4e | 247 | /* |
050349bb | 248 | * Disable a kernel channel. |
26cc6b4e DG |
249 | */ |
250 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
251 | { | |
252 | int ret; | |
253 | ||
0525e9ae DG |
254 | assert(chan); |
255 | ||
26cc6b4e DG |
256 | ret = kernctl_disable(chan->fd); |
257 | if (ret < 0) { | |
df0f840b | 258 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
259 | ret = errno; |
260 | goto error; | |
261 | } | |
262 | ||
263 | chan->enabled = 0; | |
264 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
265 | ||
266 | return 0; | |
267 | ||
268 | error: | |
269 | return ret; | |
270 | } | |
271 | ||
d36b8583 | 272 | /* |
050349bb | 273 | * Enable a kernel channel. |
d36b8583 DG |
274 | */ |
275 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
276 | { | |
277 | int ret; | |
278 | ||
0525e9ae DG |
279 | assert(chan); |
280 | ||
d36b8583 | 281 | ret = kernctl_enable(chan->fd); |
54d01ffb | 282 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 283 | PERROR("Enable kernel chan"); |
d36b8583 DG |
284 | goto error; |
285 | } | |
286 | ||
287 | chan->enabled = 1; | |
288 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
289 | ||
290 | return 0; | |
291 | ||
292 | error: | |
293 | return ret; | |
294 | } | |
295 | ||
19e70852 | 296 | /* |
050349bb | 297 | * Enable a kernel event. |
19e70852 DG |
298 | */ |
299 | int kernel_enable_event(struct ltt_kernel_event *event) | |
300 | { | |
301 | int ret; | |
302 | ||
0525e9ae DG |
303 | assert(event); |
304 | ||
19e70852 | 305 | ret = kernctl_enable(event->fd); |
42224349 DG |
306 | if (ret < 0) { |
307 | switch (errno) { | |
308 | case EEXIST: | |
f73fabfd | 309 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
310 | break; |
311 | default: | |
312 | PERROR("enable kernel event"); | |
313 | break; | |
314 | } | |
19e70852 DG |
315 | goto error; |
316 | } | |
317 | ||
318 | event->enabled = 1; | |
319 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
320 | ||
321 | return 0; | |
322 | ||
323 | error: | |
d36b8583 | 324 | return ret; |
19e70852 DG |
325 | } |
326 | ||
e953ef25 | 327 | /* |
050349bb | 328 | * Disable a kernel event. |
e953ef25 | 329 | */ |
19e70852 | 330 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
331 | { |
332 | int ret; | |
19e70852 | 333 | |
0525e9ae DG |
334 | assert(event); |
335 | ||
19e70852 | 336 | ret = kernctl_disable(event->fd); |
42224349 DG |
337 | if (ret < 0) { |
338 | switch (errno) { | |
339 | case EEXIST: | |
f73fabfd | 340 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
341 | break; |
342 | default: | |
343 | PERROR("disable kernel event"); | |
344 | break; | |
345 | } | |
19e70852 | 346 | goto error; |
e953ef25 | 347 | } |
f3ed775e | 348 | |
19e70852 DG |
349 | event->enabled = 0; |
350 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
351 | ||
f34daff7 DG |
352 | return 0; |
353 | ||
354 | error: | |
d36b8583 | 355 | return ret; |
f34daff7 | 356 | } |
aaf26714 | 357 | |
6e911cad MD |
358 | int kernel_enable_syscall(const char *syscall_name, |
359 | struct ltt_kernel_channel *channel) | |
360 | { | |
361 | return kernctl_enable_syscall(channel->fd, syscall_name); | |
362 | } | |
363 | ||
364 | int kernel_disable_syscall(const char *syscall_name, | |
365 | struct ltt_kernel_channel *channel) | |
366 | { | |
367 | return kernctl_disable_syscall(channel->fd, syscall_name); | |
368 | } | |
369 | ||
ccf10263 MD |
370 | int kernel_track_pid(struct ltt_kernel_session *session, int pid) |
371 | { | |
372 | DBG("Kernel track PID %d for session id %" PRIu64 ".", | |
373 | pid, session->id); | |
374 | return kernctl_track_pid(session->fd, pid); | |
375 | } | |
376 | ||
377 | int kernel_untrack_pid(struct ltt_kernel_session *session, int pid) | |
378 | { | |
379 | DBG("Kernel untrack PID %d for session id %" PRIu64 ".", | |
380 | pid, session->id); | |
381 | return kernctl_untrack_pid(session->fd, pid); | |
382 | } | |
383 | ||
a5dfbb9d MD |
384 | ssize_t kernel_list_tracker_pids(struct ltt_kernel_session *session, |
385 | int **_pids) | |
386 | { | |
387 | int fd, ret; | |
388 | int pid; | |
389 | ssize_t nbmem, count = 0; | |
390 | FILE *fp; | |
391 | int *pids; | |
392 | ||
393 | fd = kernctl_list_tracker_pids(session->fd); | |
394 | if (fd < 0) { | |
395 | PERROR("kernel tracker pids list"); | |
396 | goto error; | |
397 | } | |
398 | ||
399 | fp = fdopen(fd, "r"); | |
400 | if (fp == NULL) { | |
401 | PERROR("kernel tracker pids list fdopen"); | |
402 | goto error_fp; | |
403 | } | |
404 | ||
405 | nbmem = KERNEL_TRACKER_PIDS_INIT_LIST_SIZE; | |
406 | pids = zmalloc(sizeof(*pids) * nbmem); | |
407 | if (pids == NULL) { | |
408 | PERROR("alloc list pids"); | |
409 | count = -ENOMEM; | |
410 | goto end; | |
411 | } | |
412 | ||
413 | while (fscanf(fp, "process { pid = %u; };\n", &pid) == 1) { | |
414 | if (count >= nbmem) { | |
415 | int *new_pids; | |
416 | size_t new_nbmem; | |
417 | ||
418 | new_nbmem = nbmem << 1; | |
419 | DBG("Reallocating pids list from %zu to %zu entries", | |
420 | nbmem, new_nbmem); | |
421 | new_pids = realloc(pids, new_nbmem * sizeof(*new_pids)); | |
422 | if (new_pids == NULL) { | |
423 | PERROR("realloc list events"); | |
424 | free(pids); | |
425 | count = -ENOMEM; | |
426 | goto end; | |
427 | } | |
428 | /* Zero the new memory */ | |
429 | memset(new_pids + nbmem, 0, | |
430 | (new_nbmem - nbmem) * sizeof(*new_pids)); | |
431 | nbmem = new_nbmem; | |
432 | pids = new_pids; | |
433 | } | |
434 | pids[count++] = pid; | |
435 | } | |
436 | ||
437 | *_pids = pids; | |
438 | DBG("Kernel list tracker pids done (%zd pids)", count); | |
439 | end: | |
440 | ret = fclose(fp); /* closes both fp and fd */ | |
441 | if (ret) { | |
442 | PERROR("fclose"); | |
443 | } | |
444 | return count; | |
445 | ||
446 | error_fp: | |
447 | ret = close(fd); | |
448 | if (ret) { | |
449 | PERROR("close"); | |
450 | } | |
451 | error: | |
452 | return -1; | |
453 | } | |
454 | ||
aaf26714 | 455 | /* |
050349bb DG |
456 | * Create kernel metadata, open from the kernel tracer and add it to the |
457 | * kernel session. | |
aaf26714 | 458 | */ |
a4b92340 | 459 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
460 | { |
461 | int ret; | |
74024a21 | 462 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 463 | |
0525e9ae DG |
464 | assert(session); |
465 | ||
54012638 | 466 | /* Allocate kernel metadata */ |
a4b92340 | 467 | lkm = trace_kernel_create_metadata(); |
54012638 | 468 | if (lkm == NULL) { |
aaf26714 DG |
469 | goto error; |
470 | } | |
471 | ||
54012638 | 472 | /* Kernel tracer metadata creation */ |
f3ed775e | 473 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 474 | if (ret < 0) { |
74024a21 | 475 | goto error_open; |
aaf26714 DG |
476 | } |
477 | ||
8c0faa1d | 478 | lkm->fd = ret; |
7b395890 DG |
479 | /* Prevent fd duplication after execlp() */ |
480 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
481 | if (ret < 0) { | |
df0f840b | 482 | PERROR("fcntl session fd"); |
7b395890 DG |
483 | } |
484 | ||
aaf26714 | 485 | session->metadata = lkm; |
8c0faa1d | 486 | |
00e2e675 | 487 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
488 | |
489 | return 0; | |
490 | ||
74024a21 DG |
491 | error_open: |
492 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 493 | error: |
54012638 | 494 | return -1; |
8c0faa1d DG |
495 | } |
496 | ||
497 | /* | |
050349bb | 498 | * Start tracing session. |
8c0faa1d DG |
499 | */ |
500 | int kernel_start_session(struct ltt_kernel_session *session) | |
501 | { | |
502 | int ret; | |
503 | ||
0525e9ae DG |
504 | assert(session); |
505 | ||
8c0faa1d DG |
506 | ret = kernctl_start_session(session->fd); |
507 | if (ret < 0) { | |
df0f840b | 508 | PERROR("ioctl start session"); |
8c0faa1d DG |
509 | goto error; |
510 | } | |
511 | ||
512 | DBG("Kernel session started"); | |
513 | ||
514 | return 0; | |
515 | ||
516 | error: | |
517 | return ret; | |
518 | } | |
519 | ||
f3ed775e | 520 | /* |
050349bb | 521 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
522 | */ |
523 | void kernel_wait_quiescent(int fd) | |
524 | { | |
525 | int ret; | |
526 | ||
527 | DBG("Kernel quiescent wait on %d", fd); | |
528 | ||
529 | ret = kernctl_wait_quiescent(fd); | |
530 | if (ret < 0) { | |
df0f840b | 531 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
532 | ERR("Kernel quiescent wait failed"); |
533 | } | |
534 | } | |
535 | ||
d0254c7c | 536 | /* |
050349bb | 537 | * Kernel calibrate |
d0254c7c MD |
538 | */ |
539 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
540 | { | |
541 | int ret; | |
542 | ||
0525e9ae DG |
543 | assert(calibrate); |
544 | ||
d0254c7c MD |
545 | ret = kernctl_calibrate(fd, calibrate); |
546 | if (ret < 0) { | |
df0f840b | 547 | PERROR("calibrate ioctl"); |
d0254c7c MD |
548 | return -1; |
549 | } | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
554 | ||
f3ed775e | 555 | /* |
f3ed775e DG |
556 | * Force flush buffer of metadata. |
557 | */ | |
558 | int kernel_metadata_flush_buffer(int fd) | |
559 | { | |
560 | int ret; | |
561 | ||
169d2cb7 DG |
562 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
563 | ||
f3ed775e DG |
564 | ret = kernctl_buffer_flush(fd); |
565 | if (ret < 0) { | |
00e2e675 | 566 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
567 | } |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | /* | |
050349bb | 573 | * Force flush buffer for channel. |
f3ed775e DG |
574 | */ |
575 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
576 | { | |
577 | int ret; | |
578 | struct ltt_kernel_stream *stream; | |
579 | ||
0525e9ae DG |
580 | assert(channel); |
581 | ||
f3ed775e DG |
582 | DBG("Flush buffer for channel %s", channel->channel->name); |
583 | ||
584 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
585 | DBG("Flushing channel stream %d", stream->fd); | |
586 | ret = kernctl_buffer_flush(stream->fd); | |
587 | if (ret < 0) { | |
df0f840b | 588 | PERROR("ioctl"); |
f3ed775e DG |
589 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
590 | stream->fd, ret); | |
591 | } | |
592 | } | |
593 | ||
594 | return 0; | |
595 | } | |
596 | ||
8c0faa1d | 597 | /* |
050349bb | 598 | * Stop tracing session. |
8c0faa1d DG |
599 | */ |
600 | int kernel_stop_session(struct ltt_kernel_session *session) | |
601 | { | |
602 | int ret; | |
603 | ||
0525e9ae DG |
604 | assert(session); |
605 | ||
8c0faa1d DG |
606 | ret = kernctl_stop_session(session->fd); |
607 | if (ret < 0) { | |
608 | goto error; | |
609 | } | |
610 | ||
611 | DBG("Kernel session stopped"); | |
612 | ||
613 | return 0; | |
614 | ||
615 | error: | |
616 | return ret; | |
617 | } | |
618 | ||
619 | /* | |
050349bb DG |
620 | * Open stream of channel, register it to the kernel tracer and add it |
621 | * to the stream list of the channel. | |
8c0faa1d | 622 | * |
050349bb | 623 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 624 | */ |
f3ed775e | 625 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 626 | { |
00e2e675 | 627 | int ret, count = 0; |
8c0faa1d DG |
628 | struct ltt_kernel_stream *lks; |
629 | ||
0525e9ae DG |
630 | assert(channel); |
631 | ||
5a47c6a2 | 632 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
00e2e675 | 633 | lks = trace_kernel_create_stream(channel->channel->name, count); |
8c0faa1d | 634 | if (lks == NULL) { |
799e2c4f MD |
635 | ret = close(ret); |
636 | if (ret) { | |
637 | PERROR("close"); | |
638 | } | |
8c0faa1d DG |
639 | goto error; |
640 | } | |
641 | ||
642 | lks->fd = ret; | |
7b395890 DG |
643 | /* Prevent fd duplication after execlp() */ |
644 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
645 | if (ret < 0) { | |
df0f840b | 646 | PERROR("fcntl session fd"); |
7b395890 DG |
647 | } |
648 | ||
1624d5b7 JD |
649 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
650 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
651 | ||
54012638 | 652 | /* Add stream to channe stream list */ |
8c0faa1d DG |
653 | cds_list_add(&lks->list, &channel->stream_list.head); |
654 | channel->stream_count++; | |
8c0faa1d | 655 | |
00e2e675 DG |
656 | /* Increment counter which represent CPU number. */ |
657 | count++; | |
658 | ||
659 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, | |
660 | lks->state); | |
54012638 | 661 | } |
8c0faa1d DG |
662 | |
663 | return channel->stream_count; | |
664 | ||
665 | error: | |
54012638 | 666 | return -1; |
8c0faa1d DG |
667 | } |
668 | ||
669 | /* | |
050349bb | 670 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 671 | */ |
f3ed775e | 672 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
673 | { |
674 | int ret; | |
675 | ||
0525e9ae DG |
676 | assert(session); |
677 | ||
8c0faa1d DG |
678 | ret = kernctl_create_stream(session->metadata->fd); |
679 | if (ret < 0) { | |
df0f840b | 680 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
681 | goto error; |
682 | } | |
683 | ||
684 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
685 | session->metadata_stream_fd = ret; | |
7b395890 DG |
686 | /* Prevent fd duplication after execlp() */ |
687 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
688 | if (ret < 0) { | |
df0f840b | 689 | PERROR("fcntl session fd"); |
7b395890 | 690 | } |
aaf26714 DG |
691 | |
692 | return 0; | |
693 | ||
694 | error: | |
54012638 | 695 | return -1; |
aaf26714 | 696 | } |
2ef84c95 DG |
697 | |
698 | /* | |
9f19cc17 | 699 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 700 | */ |
9f19cc17 | 701 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 702 | { |
53efb85a | 703 | int fd, ret; |
9f19cc17 DG |
704 | char *event; |
705 | size_t nbmem, count = 0; | |
2ef84c95 | 706 | FILE *fp; |
9f19cc17 | 707 | struct lttng_event *elist; |
2ef84c95 | 708 | |
0525e9ae DG |
709 | assert(events); |
710 | ||
2ef84c95 DG |
711 | fd = kernctl_tracepoint_list(tracer_fd); |
712 | if (fd < 0) { | |
df0f840b | 713 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
714 | goto error; |
715 | } | |
716 | ||
717 | fp = fdopen(fd, "r"); | |
718 | if (fp == NULL) { | |
df0f840b | 719 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 720 | goto error_fp; |
2ef84c95 DG |
721 | } |
722 | ||
723 | /* | |
724 | * Init memory size counter | |
725 | * See kernel-ctl.h for explanation of this value | |
726 | */ | |
6725fe19 | 727 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 728 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
729 | if (elist == NULL) { |
730 | PERROR("alloc list events"); | |
731 | count = -ENOMEM; | |
732 | goto end; | |
733 | } | |
2ef84c95 | 734 | |
53efb85a | 735 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 736 | if (count >= nbmem) { |
3b870559 | 737 | struct lttng_event *new_elist; |
53efb85a | 738 | size_t new_nbmem; |
3b870559 | 739 | |
53efb85a MD |
740 | new_nbmem = nbmem << 1; |
741 | DBG("Reallocating event list from %zu to %zu bytes", | |
742 | nbmem, new_nbmem); | |
743 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 744 | if (new_elist == NULL) { |
df0f840b | 745 | PERROR("realloc list events"); |
3b870559 MD |
746 | free(event); |
747 | free(elist); | |
61b73b12 MD |
748 | count = -ENOMEM; |
749 | goto end; | |
2ef84c95 | 750 | } |
53efb85a MD |
751 | /* Zero the new memory */ |
752 | memset(new_elist + nbmem, 0, | |
753 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
754 | nbmem = new_nbmem; | |
3b870559 | 755 | elist = new_elist; |
2ef84c95 | 756 | } |
99497cd0 MD |
757 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
758 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 759 | elist[count].enabled = -1; |
9f19cc17 | 760 | count++; |
3b870559 | 761 | free(event); |
2ef84c95 DG |
762 | } |
763 | ||
9f19cc17 | 764 | *events = elist; |
ced2f820 | 765 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 766 | end: |
799e2c4f MD |
767 | ret = fclose(fp); /* closes both fp and fd */ |
768 | if (ret) { | |
769 | PERROR("fclose"); | |
770 | } | |
9f19cc17 | 771 | return count; |
2ef84c95 | 772 | |
61b73b12 | 773 | error_fp: |
799e2c4f MD |
774 | ret = close(fd); |
775 | if (ret) { | |
776 | PERROR("close"); | |
777 | } | |
2ef84c95 DG |
778 | error: |
779 | return -1; | |
780 | } | |
096102bd DG |
781 | |
782 | /* | |
783 | * Get kernel version and validate it. | |
784 | */ | |
785 | int kernel_validate_version(int tracer_fd) | |
786 | { | |
787 | int ret; | |
788 | struct lttng_kernel_tracer_version version; | |
c052142c | 789 | struct lttng_kernel_tracer_abi_version abi_version; |
096102bd DG |
790 | |
791 | ret = kernctl_tracer_version(tracer_fd, &version); | |
792 | if (ret < 0) { | |
793 | ERR("Failed at getting the lttng-modules version"); | |
794 | goto error; | |
795 | } | |
796 | ||
797 | /* Validate version */ | |
c052142c MD |
798 | if (version.major != VERSION_MAJOR) { |
799 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", | |
800 | version.major, VERSION_MAJOR); | |
096102bd | 801 | goto error_version; |
096102bd | 802 | } |
c052142c MD |
803 | ret = kernctl_tracer_abi_version(tracer_fd, &abi_version); |
804 | if (ret < 0) { | |
805 | ERR("Failed at getting lttng-modules ABI version"); | |
806 | goto error; | |
807 | } | |
808 | if (abi_version.major != LTTNG_MODULES_ABI_MAJOR_VERSION) { | |
809 | ERR("Kernel tracer ABI version (%d.%d) is not compatible with expected ABI major version (%d.*)", | |
810 | abi_version.major, abi_version.minor, | |
811 | LTTNG_MODULES_ABI_MAJOR_VERSION); | |
812 | goto error; | |
813 | } | |
814 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
815 | version.major, version.minor, | |
816 | abi_version.major, abi_version.minor); | |
096102bd DG |
817 | return 0; |
818 | ||
819 | error_version: | |
096102bd DG |
820 | ret = -1; |
821 | ||
822 | error: | |
823 | return ret; | |
824 | } | |
335a95b7 MD |
825 | |
826 | /* | |
827 | * Kernel work-arounds called at the start of sessiond main(). | |
828 | */ | |
829 | int init_kernel_workarounds(void) | |
830 | { | |
8936c33a | 831 | int ret; |
335a95b7 MD |
832 | FILE *fp; |
833 | ||
834 | /* | |
835 | * boot_id needs to be read once before being used concurrently | |
836 | * to deal with a Linux kernel race. A fix is proposed for | |
837 | * upstream, but the work-around is needed for older kernels. | |
838 | */ | |
839 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
840 | if (!fp) { | |
841 | goto end_boot_id; | |
842 | } | |
843 | while (!feof(fp)) { | |
844 | char buf[37] = ""; | |
845 | ||
8936c33a DG |
846 | ret = fread(buf, 1, sizeof(buf), fp); |
847 | if (ret < 0) { | |
848 | /* Ignore error, we don't really care */ | |
849 | } | |
335a95b7 | 850 | } |
799e2c4f MD |
851 | ret = fclose(fp); |
852 | if (ret) { | |
853 | PERROR("fclose"); | |
854 | } | |
335a95b7 | 855 | end_boot_id: |
335a95b7 MD |
856 | return 0; |
857 | } | |
2f77fc4b DG |
858 | |
859 | /* | |
860 | * Complete teardown of a kernel session. | |
861 | */ | |
862 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
863 | { | |
864 | if (ksess == NULL) { | |
865 | DBG3("No kernel session when tearing down session"); | |
866 | return; | |
867 | } | |
868 | ||
869 | DBG("Tearing down kernel session"); | |
870 | ||
07b86b52 | 871 | /* |
15dc512a DG |
872 | * Destroy channels on the consumer if at least one FD has been sent and we |
873 | * are in no output mode because the streams are in *no* monitor mode so we | |
874 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 875 | */ |
15dc512a | 876 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
877 | int ret; |
878 | struct consumer_socket *socket; | |
879 | struct lttng_ht_iter iter; | |
880 | ||
881 | /* For each consumer socket. */ | |
d069d577 | 882 | rcu_read_lock(); |
07b86b52 JD |
883 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
884 | socket, node.node) { | |
885 | struct ltt_kernel_channel *chan; | |
886 | ||
887 | /* For each channel, ask the consumer to destroy it. */ | |
888 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
889 | ret = kernel_consumer_destroy_channel(socket, chan); | |
890 | if (ret < 0) { | |
891 | /* Consumer is probably dead. Use next socket. */ | |
892 | continue; | |
893 | } | |
894 | } | |
895 | } | |
d069d577 | 896 | rcu_read_unlock(); |
07b86b52 JD |
897 | } |
898 | ||
2f77fc4b DG |
899 | /* Close any relayd session */ |
900 | consumer_output_send_destroy_relayd(ksess->consumer); | |
901 | ||
902 | trace_kernel_destroy_session(ksess); | |
903 | } | |
fb5f35b6 DG |
904 | |
905 | /* | |
906 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
907 | */ | |
908 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
909 | { | |
910 | struct ltt_kernel_session *ksess = NULL; | |
911 | ||
912 | assert(kchan); | |
913 | assert(kchan->channel); | |
914 | ||
915 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
916 | ||
917 | /* Update channel count of associated session. */ | |
918 | if (kchan->session) { | |
919 | /* Keep pointer reference so we can update it after the destroy. */ | |
920 | ksess = kchan->session; | |
921 | } | |
922 | ||
923 | trace_kernel_destroy_channel(kchan); | |
924 | ||
925 | /* | |
926 | * At this point the kernel channel is not visible anymore. This is safe | |
927 | * since in order to work on a visible kernel session, the tracing session | |
928 | * lock (ltt_session.lock) MUST be acquired. | |
929 | */ | |
930 | if (ksess) { | |
931 | ksess->channel_count--; | |
932 | } | |
933 | } | |
6dc3064a DG |
934 | |
935 | /* | |
936 | * Take a snapshot for a given kernel session. | |
937 | * | |
2a06df8d | 938 | * Return 0 on success or else return a LTTNG_ERR code. |
6dc3064a DG |
939 | */ |
940 | int kernel_snapshot_record(struct ltt_kernel_session *ksess, | |
d07ceecd MD |
941 | struct snapshot_output *output, int wait, |
942 | uint64_t nb_packets_per_stream) | |
6dc3064a | 943 | { |
2a06df8d | 944 | int err, ret, saved_metadata_fd; |
6dc3064a DG |
945 | struct consumer_socket *socket; |
946 | struct lttng_ht_iter iter; | |
947 | struct ltt_kernel_metadata *saved_metadata; | |
948 | ||
949 | assert(ksess); | |
950 | assert(ksess->consumer); | |
951 | assert(output); | |
952 | ||
953 | DBG("Kernel snapshot record started"); | |
954 | ||
955 | /* Save current metadata since the following calls will change it. */ | |
956 | saved_metadata = ksess->metadata; | |
957 | saved_metadata_fd = ksess->metadata_stream_fd; | |
958 | ||
959 | rcu_read_lock(); | |
960 | ||
961 | ret = kernel_open_metadata(ksess); | |
962 | if (ret < 0) { | |
963 | ret = LTTNG_ERR_KERN_META_FAIL; | |
964 | goto error; | |
965 | } | |
966 | ||
967 | ret = kernel_open_metadata_stream(ksess); | |
968 | if (ret < 0) { | |
969 | ret = LTTNG_ERR_KERN_META_FAIL; | |
970 | goto error_open_stream; | |
971 | } | |
972 | ||
973 | /* Send metadata to consumer and snapshot everything. */ | |
974 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
975 | socket, node.node) { | |
976 | struct consumer_output *saved_output; | |
977 | struct ltt_kernel_channel *chan; | |
6dc3064a DG |
978 | |
979 | /* | |
980 | * Temporarly switch consumer output for our snapshot output. As long | |
981 | * as the session lock is taken, this is safe. | |
982 | */ | |
983 | saved_output = ksess->consumer; | |
984 | ksess->consumer = output->consumer; | |
985 | ||
986 | pthread_mutex_lock(socket->lock); | |
987 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 988 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 989 | pthread_mutex_unlock(socket->lock); |
07b86b52 | 990 | /* Put back the saved consumer output into the session. */ |
6dc3064a DG |
991 | ksess->consumer = saved_output; |
992 | if (ret < 0) { | |
993 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
994 | goto error_consumer; | |
995 | } | |
996 | ||
997 | /* For each channel, ask the consumer to snapshot it. */ | |
998 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
07b86b52 | 999 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1000 | ret = consumer_snapshot_channel(socket, chan->fd, output, 0, |
5c786ded JD |
1001 | ksess->uid, ksess->gid, |
1002 | DEFAULT_KERNEL_TRACE_DIR, wait, | |
d07ceecd | 1003 | nb_packets_per_stream); |
07b86b52 | 1004 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
1005 | if (ret < 0) { |
1006 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
2a06df8d DG |
1007 | (void) kernel_consumer_destroy_metadata(socket, |
1008 | ksess->metadata); | |
6dc3064a DG |
1009 | goto error_consumer; |
1010 | } | |
1011 | } | |
1012 | ||
1013 | /* Snapshot metadata, */ | |
07b86b52 | 1014 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1015 | ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output, |
5c786ded | 1016 | 1, ksess->uid, ksess->gid, |
d07ceecd | 1017 | DEFAULT_KERNEL_TRACE_DIR, wait, 0); |
07b86b52 | 1018 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
1019 | if (ret < 0) { |
1020 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1021 | goto error_consumer; | |
1022 | } | |
07b86b52 JD |
1023 | |
1024 | /* | |
1025 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1026 | * it's not monitored on the consumer side. | |
1027 | */ | |
1028 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1029 | } |
1030 | ||
fac41e72 DG |
1031 | ret = LTTNG_OK; |
1032 | ||
6dc3064a DG |
1033 | error_consumer: |
1034 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1035 | err = close(ksess->metadata_stream_fd); |
1036 | if (err < 0) { | |
6dc3064a DG |
1037 | PERROR("close snapshot kernel"); |
1038 | } | |
1039 | ||
1040 | error_open_stream: | |
1041 | trace_kernel_destroy_metadata(ksess->metadata); | |
1042 | error: | |
1043 | /* Restore metadata state.*/ | |
1044 | ksess->metadata = saved_metadata; | |
1045 | ksess->metadata_stream_fd = saved_metadata_fd; | |
1046 | ||
1047 | rcu_read_unlock(); | |
1048 | return ret; | |
1049 | } | |
834978fd DG |
1050 | |
1051 | /* | |
1052 | * Get the syscall mask array from the kernel tracer. | |
1053 | * | |
1054 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1055 | * be freed. | |
1056 | */ | |
1057 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1058 | { | |
1059 | assert(syscall_mask); | |
1060 | assert(nr_bits); | |
1061 | ||
1062 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1063 | } |