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 | 179 | int kernel_create_event(struct lttng_event *ev, |
00a62084 MD |
180 | struct ltt_kernel_channel *channel, |
181 | char *filter_expression, | |
182 | struct lttng_filter_bytecode *filter) | |
f34daff7 DG |
183 | { |
184 | int ret; | |
185 | struct ltt_kernel_event *event; | |
f34daff7 | 186 | |
0525e9ae DG |
187 | assert(ev); |
188 | assert(channel); | |
189 | ||
a969e101 | 190 | /* We pass ownership of filter_expression and filter */ |
00a62084 MD |
191 | event = trace_kernel_create_event(ev, filter_expression, |
192 | filter); | |
54012638 | 193 | if (event == NULL) { |
d87bfb32 | 194 | ret = -1; |
f34daff7 DG |
195 | goto error; |
196 | } | |
197 | ||
f3ed775e DG |
198 | ret = kernctl_create_event(channel->fd, event->event); |
199 | if (ret < 0) { | |
bd29c13d DG |
200 | switch (errno) { |
201 | case EEXIST: | |
202 | break; | |
203 | case ENOSYS: | |
204 | WARN("Event type not implemented"); | |
205 | break; | |
8197a339 DG |
206 | case ENOENT: |
207 | WARN("Event %s not found!", ev->name); | |
208 | break; | |
bd29c13d | 209 | default: |
d87bfb32 DG |
210 | PERROR("create event ioctl"); |
211 | } | |
212 | ret = -errno; | |
e953ef25 | 213 | goto free_event; |
8c0faa1d | 214 | } |
f34daff7 | 215 | |
d0ae4ea8 | 216 | event->type = ev->type; |
f3ed775e | 217 | event->fd = ret; |
7b395890 DG |
218 | /* Prevent fd duplication after execlp() */ |
219 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
220 | if (ret < 0) { | |
df0f840b | 221 | PERROR("fcntl session fd"); |
7b395890 DG |
222 | } |
223 | ||
00a62084 MD |
224 | if (filter) { |
225 | ret = kernctl_filter(event->fd, filter); | |
226 | if (ret) { | |
227 | goto filter_error; | |
228 | } | |
229 | } | |
230 | ||
231 | ret = kernctl_enable(event->fd); | |
232 | if (ret < 0) { | |
233 | switch (errno) { | |
234 | case EEXIST: | |
235 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
236 | break; | |
237 | default: | |
238 | PERROR("enable kernel event"); | |
239 | break; | |
240 | } | |
241 | goto enable_error; | |
242 | } | |
243 | ||
f3ed775e DG |
244 | /* Add event to event list */ |
245 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
246 | channel->event_count++; |
247 | ||
e953ef25 DG |
248 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
249 | ||
250 | return 0; | |
251 | ||
00a62084 MD |
252 | enable_error: |
253 | filter_error: | |
254 | { | |
255 | int closeret; | |
256 | ||
257 | closeret = close(event->fd); | |
258 | if (closeret) { | |
259 | PERROR("close event fd"); | |
260 | } | |
261 | } | |
e953ef25 DG |
262 | free_event: |
263 | free(event); | |
264 | error: | |
d87bfb32 | 265 | return ret; |
e953ef25 DG |
266 | } |
267 | ||
26cc6b4e | 268 | /* |
050349bb | 269 | * Disable a kernel channel. |
26cc6b4e DG |
270 | */ |
271 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
272 | { | |
273 | int ret; | |
274 | ||
0525e9ae DG |
275 | assert(chan); |
276 | ||
26cc6b4e DG |
277 | ret = kernctl_disable(chan->fd); |
278 | if (ret < 0) { | |
df0f840b | 279 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
280 | ret = errno; |
281 | goto error; | |
282 | } | |
283 | ||
284 | chan->enabled = 0; | |
285 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
286 | ||
287 | return 0; | |
288 | ||
289 | error: | |
290 | return ret; | |
291 | } | |
292 | ||
d36b8583 | 293 | /* |
050349bb | 294 | * Enable a kernel channel. |
d36b8583 DG |
295 | */ |
296 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
297 | { | |
298 | int ret; | |
299 | ||
0525e9ae DG |
300 | assert(chan); |
301 | ||
d36b8583 | 302 | ret = kernctl_enable(chan->fd); |
54d01ffb | 303 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 304 | PERROR("Enable kernel chan"); |
d36b8583 DG |
305 | goto error; |
306 | } | |
307 | ||
308 | chan->enabled = 1; | |
309 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
310 | ||
311 | return 0; | |
312 | ||
313 | error: | |
314 | return ret; | |
315 | } | |
316 | ||
19e70852 | 317 | /* |
050349bb | 318 | * Enable a kernel event. |
19e70852 DG |
319 | */ |
320 | int kernel_enable_event(struct ltt_kernel_event *event) | |
321 | { | |
322 | int ret; | |
323 | ||
0525e9ae DG |
324 | assert(event); |
325 | ||
19e70852 | 326 | ret = kernctl_enable(event->fd); |
42224349 DG |
327 | if (ret < 0) { |
328 | switch (errno) { | |
329 | case EEXIST: | |
f73fabfd | 330 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
331 | break; |
332 | default: | |
333 | PERROR("enable kernel event"); | |
334 | break; | |
335 | } | |
19e70852 DG |
336 | goto error; |
337 | } | |
338 | ||
339 | event->enabled = 1; | |
340 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
341 | ||
342 | return 0; | |
343 | ||
344 | error: | |
d36b8583 | 345 | return ret; |
19e70852 DG |
346 | } |
347 | ||
e953ef25 | 348 | /* |
050349bb | 349 | * Disable a kernel event. |
e953ef25 | 350 | */ |
19e70852 | 351 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
352 | { |
353 | int ret; | |
19e70852 | 354 | |
0525e9ae DG |
355 | assert(event); |
356 | ||
19e70852 | 357 | ret = kernctl_disable(event->fd); |
42224349 DG |
358 | if (ret < 0) { |
359 | switch (errno) { | |
360 | case EEXIST: | |
f73fabfd | 361 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
362 | break; |
363 | default: | |
364 | PERROR("disable kernel event"); | |
365 | break; | |
366 | } | |
19e70852 | 367 | goto error; |
e953ef25 | 368 | } |
f3ed775e | 369 | |
19e70852 DG |
370 | event->enabled = 0; |
371 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
372 | ||
f34daff7 DG |
373 | return 0; |
374 | ||
375 | error: | |
d36b8583 | 376 | return ret; |
f34daff7 | 377 | } |
aaf26714 | 378 | |
6e911cad | 379 | |
ccf10263 MD |
380 | int kernel_track_pid(struct ltt_kernel_session *session, int pid) |
381 | { | |
382 | DBG("Kernel track PID %d for session id %" PRIu64 ".", | |
383 | pid, session->id); | |
384 | return kernctl_track_pid(session->fd, pid); | |
385 | } | |
386 | ||
387 | int kernel_untrack_pid(struct ltt_kernel_session *session, int pid) | |
388 | { | |
389 | DBG("Kernel untrack PID %d for session id %" PRIu64 ".", | |
390 | pid, session->id); | |
391 | return kernctl_untrack_pid(session->fd, pid); | |
392 | } | |
393 | ||
a5dfbb9d MD |
394 | ssize_t kernel_list_tracker_pids(struct ltt_kernel_session *session, |
395 | int **_pids) | |
396 | { | |
397 | int fd, ret; | |
398 | int pid; | |
399 | ssize_t nbmem, count = 0; | |
400 | FILE *fp; | |
401 | int *pids; | |
402 | ||
403 | fd = kernctl_list_tracker_pids(session->fd); | |
404 | if (fd < 0) { | |
405 | PERROR("kernel tracker pids list"); | |
406 | goto error; | |
407 | } | |
408 | ||
409 | fp = fdopen(fd, "r"); | |
410 | if (fp == NULL) { | |
411 | PERROR("kernel tracker pids list fdopen"); | |
412 | goto error_fp; | |
413 | } | |
414 | ||
415 | nbmem = KERNEL_TRACKER_PIDS_INIT_LIST_SIZE; | |
416 | pids = zmalloc(sizeof(*pids) * nbmem); | |
417 | if (pids == NULL) { | |
418 | PERROR("alloc list pids"); | |
419 | count = -ENOMEM; | |
420 | goto end; | |
421 | } | |
422 | ||
423 | while (fscanf(fp, "process { pid = %u; };\n", &pid) == 1) { | |
424 | if (count >= nbmem) { | |
425 | int *new_pids; | |
426 | size_t new_nbmem; | |
427 | ||
428 | new_nbmem = nbmem << 1; | |
429 | DBG("Reallocating pids list from %zu to %zu entries", | |
430 | nbmem, new_nbmem); | |
431 | new_pids = realloc(pids, new_nbmem * sizeof(*new_pids)); | |
432 | if (new_pids == NULL) { | |
433 | PERROR("realloc list events"); | |
434 | free(pids); | |
435 | count = -ENOMEM; | |
436 | goto end; | |
437 | } | |
438 | /* Zero the new memory */ | |
439 | memset(new_pids + nbmem, 0, | |
440 | (new_nbmem - nbmem) * sizeof(*new_pids)); | |
441 | nbmem = new_nbmem; | |
442 | pids = new_pids; | |
443 | } | |
444 | pids[count++] = pid; | |
445 | } | |
446 | ||
447 | *_pids = pids; | |
448 | DBG("Kernel list tracker pids done (%zd pids)", count); | |
449 | end: | |
450 | ret = fclose(fp); /* closes both fp and fd */ | |
451 | if (ret) { | |
452 | PERROR("fclose"); | |
453 | } | |
454 | return count; | |
455 | ||
456 | error_fp: | |
457 | ret = close(fd); | |
458 | if (ret) { | |
459 | PERROR("close"); | |
460 | } | |
461 | error: | |
462 | return -1; | |
463 | } | |
464 | ||
aaf26714 | 465 | /* |
050349bb DG |
466 | * Create kernel metadata, open from the kernel tracer and add it to the |
467 | * kernel session. | |
aaf26714 | 468 | */ |
a4b92340 | 469 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
470 | { |
471 | int ret; | |
74024a21 | 472 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 473 | |
0525e9ae DG |
474 | assert(session); |
475 | ||
54012638 | 476 | /* Allocate kernel metadata */ |
a4b92340 | 477 | lkm = trace_kernel_create_metadata(); |
54012638 | 478 | if (lkm == NULL) { |
aaf26714 DG |
479 | goto error; |
480 | } | |
481 | ||
54012638 | 482 | /* Kernel tracer metadata creation */ |
f3ed775e | 483 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 484 | if (ret < 0) { |
74024a21 | 485 | goto error_open; |
aaf26714 DG |
486 | } |
487 | ||
8c0faa1d | 488 | lkm->fd = ret; |
7b395890 DG |
489 | /* Prevent fd duplication after execlp() */ |
490 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
491 | if (ret < 0) { | |
df0f840b | 492 | PERROR("fcntl session fd"); |
7b395890 DG |
493 | } |
494 | ||
aaf26714 | 495 | session->metadata = lkm; |
8c0faa1d | 496 | |
00e2e675 | 497 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
498 | |
499 | return 0; | |
500 | ||
74024a21 DG |
501 | error_open: |
502 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 503 | error: |
54012638 | 504 | return -1; |
8c0faa1d DG |
505 | } |
506 | ||
507 | /* | |
050349bb | 508 | * Start tracing session. |
8c0faa1d DG |
509 | */ |
510 | int kernel_start_session(struct ltt_kernel_session *session) | |
511 | { | |
512 | int ret; | |
513 | ||
0525e9ae DG |
514 | assert(session); |
515 | ||
8c0faa1d DG |
516 | ret = kernctl_start_session(session->fd); |
517 | if (ret < 0) { | |
df0f840b | 518 | PERROR("ioctl start session"); |
8c0faa1d DG |
519 | goto error; |
520 | } | |
521 | ||
522 | DBG("Kernel session started"); | |
523 | ||
524 | return 0; | |
525 | ||
526 | error: | |
527 | return ret; | |
528 | } | |
529 | ||
f3ed775e | 530 | /* |
050349bb | 531 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
532 | */ |
533 | void kernel_wait_quiescent(int fd) | |
534 | { | |
535 | int ret; | |
536 | ||
537 | DBG("Kernel quiescent wait on %d", fd); | |
538 | ||
539 | ret = kernctl_wait_quiescent(fd); | |
540 | if (ret < 0) { | |
df0f840b | 541 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
542 | ERR("Kernel quiescent wait failed"); |
543 | } | |
544 | } | |
545 | ||
d0254c7c | 546 | /* |
050349bb | 547 | * Kernel calibrate |
d0254c7c MD |
548 | */ |
549 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
550 | { | |
551 | int ret; | |
552 | ||
0525e9ae DG |
553 | assert(calibrate); |
554 | ||
d0254c7c MD |
555 | ret = kernctl_calibrate(fd, calibrate); |
556 | if (ret < 0) { | |
df0f840b | 557 | PERROR("calibrate ioctl"); |
d0254c7c MD |
558 | return -1; |
559 | } | |
560 | ||
561 | return 0; | |
562 | } | |
563 | ||
564 | ||
f3ed775e | 565 | /* |
f3ed775e DG |
566 | * Force flush buffer of metadata. |
567 | */ | |
568 | int kernel_metadata_flush_buffer(int fd) | |
569 | { | |
570 | int ret; | |
571 | ||
169d2cb7 DG |
572 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
573 | ||
f3ed775e DG |
574 | ret = kernctl_buffer_flush(fd); |
575 | if (ret < 0) { | |
00e2e675 | 576 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
577 | } |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
582 | /* | |
050349bb | 583 | * Force flush buffer for channel. |
f3ed775e DG |
584 | */ |
585 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
586 | { | |
587 | int ret; | |
588 | struct ltt_kernel_stream *stream; | |
589 | ||
0525e9ae DG |
590 | assert(channel); |
591 | ||
f3ed775e DG |
592 | DBG("Flush buffer for channel %s", channel->channel->name); |
593 | ||
594 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
595 | DBG("Flushing channel stream %d", stream->fd); | |
596 | ret = kernctl_buffer_flush(stream->fd); | |
597 | if (ret < 0) { | |
df0f840b | 598 | PERROR("ioctl"); |
f3ed775e DG |
599 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
600 | stream->fd, ret); | |
601 | } | |
602 | } | |
603 | ||
604 | return 0; | |
605 | } | |
606 | ||
8c0faa1d | 607 | /* |
050349bb | 608 | * Stop tracing session. |
8c0faa1d DG |
609 | */ |
610 | int kernel_stop_session(struct ltt_kernel_session *session) | |
611 | { | |
612 | int ret; | |
613 | ||
0525e9ae DG |
614 | assert(session); |
615 | ||
8c0faa1d DG |
616 | ret = kernctl_stop_session(session->fd); |
617 | if (ret < 0) { | |
618 | goto error; | |
619 | } | |
620 | ||
621 | DBG("Kernel session stopped"); | |
622 | ||
623 | return 0; | |
624 | ||
625 | error: | |
626 | return ret; | |
627 | } | |
628 | ||
629 | /* | |
050349bb DG |
630 | * Open stream of channel, register it to the kernel tracer and add it |
631 | * to the stream list of the channel. | |
8c0faa1d | 632 | * |
050349bb | 633 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 634 | */ |
f3ed775e | 635 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 636 | { |
00e2e675 | 637 | int ret, count = 0; |
8c0faa1d DG |
638 | struct ltt_kernel_stream *lks; |
639 | ||
0525e9ae DG |
640 | assert(channel); |
641 | ||
5a47c6a2 | 642 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
00e2e675 | 643 | lks = trace_kernel_create_stream(channel->channel->name, count); |
8c0faa1d | 644 | if (lks == NULL) { |
799e2c4f MD |
645 | ret = close(ret); |
646 | if (ret) { | |
647 | PERROR("close"); | |
648 | } | |
8c0faa1d DG |
649 | goto error; |
650 | } | |
651 | ||
652 | lks->fd = ret; | |
7b395890 DG |
653 | /* Prevent fd duplication after execlp() */ |
654 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
655 | if (ret < 0) { | |
df0f840b | 656 | PERROR("fcntl session fd"); |
7b395890 DG |
657 | } |
658 | ||
1624d5b7 JD |
659 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
660 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
661 | ||
54012638 | 662 | /* Add stream to channe stream list */ |
8c0faa1d DG |
663 | cds_list_add(&lks->list, &channel->stream_list.head); |
664 | channel->stream_count++; | |
8c0faa1d | 665 | |
00e2e675 DG |
666 | /* Increment counter which represent CPU number. */ |
667 | count++; | |
668 | ||
669 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, | |
670 | lks->state); | |
54012638 | 671 | } |
8c0faa1d DG |
672 | |
673 | return channel->stream_count; | |
674 | ||
675 | error: | |
54012638 | 676 | return -1; |
8c0faa1d DG |
677 | } |
678 | ||
679 | /* | |
050349bb | 680 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 681 | */ |
f3ed775e | 682 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
683 | { |
684 | int ret; | |
685 | ||
0525e9ae DG |
686 | assert(session); |
687 | ||
8c0faa1d DG |
688 | ret = kernctl_create_stream(session->metadata->fd); |
689 | if (ret < 0) { | |
df0f840b | 690 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
691 | goto error; |
692 | } | |
693 | ||
694 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
695 | session->metadata_stream_fd = ret; | |
7b395890 DG |
696 | /* Prevent fd duplication after execlp() */ |
697 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
698 | if (ret < 0) { | |
df0f840b | 699 | PERROR("fcntl session fd"); |
7b395890 | 700 | } |
aaf26714 DG |
701 | |
702 | return 0; | |
703 | ||
704 | error: | |
54012638 | 705 | return -1; |
aaf26714 | 706 | } |
2ef84c95 DG |
707 | |
708 | /* | |
9f19cc17 | 709 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 710 | */ |
9f19cc17 | 711 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 712 | { |
53efb85a | 713 | int fd, ret; |
9f19cc17 DG |
714 | char *event; |
715 | size_t nbmem, count = 0; | |
2ef84c95 | 716 | FILE *fp; |
9f19cc17 | 717 | struct lttng_event *elist; |
2ef84c95 | 718 | |
0525e9ae DG |
719 | assert(events); |
720 | ||
2ef84c95 DG |
721 | fd = kernctl_tracepoint_list(tracer_fd); |
722 | if (fd < 0) { | |
df0f840b | 723 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
724 | goto error; |
725 | } | |
726 | ||
727 | fp = fdopen(fd, "r"); | |
728 | if (fp == NULL) { | |
df0f840b | 729 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 730 | goto error_fp; |
2ef84c95 DG |
731 | } |
732 | ||
733 | /* | |
734 | * Init memory size counter | |
735 | * See kernel-ctl.h for explanation of this value | |
736 | */ | |
6725fe19 | 737 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 738 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
739 | if (elist == NULL) { |
740 | PERROR("alloc list events"); | |
741 | count = -ENOMEM; | |
742 | goto end; | |
743 | } | |
2ef84c95 | 744 | |
53efb85a | 745 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 746 | if (count >= nbmem) { |
3b870559 | 747 | struct lttng_event *new_elist; |
53efb85a | 748 | size_t new_nbmem; |
3b870559 | 749 | |
53efb85a MD |
750 | new_nbmem = nbmem << 1; |
751 | DBG("Reallocating event list from %zu to %zu bytes", | |
752 | nbmem, new_nbmem); | |
753 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 754 | if (new_elist == NULL) { |
df0f840b | 755 | PERROR("realloc list events"); |
3b870559 MD |
756 | free(event); |
757 | free(elist); | |
61b73b12 MD |
758 | count = -ENOMEM; |
759 | goto end; | |
2ef84c95 | 760 | } |
53efb85a MD |
761 | /* Zero the new memory */ |
762 | memset(new_elist + nbmem, 0, | |
763 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
764 | nbmem = new_nbmem; | |
3b870559 | 765 | elist = new_elist; |
2ef84c95 | 766 | } |
99497cd0 MD |
767 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
768 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 769 | elist[count].enabled = -1; |
9f19cc17 | 770 | count++; |
3b870559 | 771 | free(event); |
2ef84c95 DG |
772 | } |
773 | ||
9f19cc17 | 774 | *events = elist; |
ced2f820 | 775 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 776 | end: |
799e2c4f MD |
777 | ret = fclose(fp); /* closes both fp and fd */ |
778 | if (ret) { | |
779 | PERROR("fclose"); | |
780 | } | |
9f19cc17 | 781 | return count; |
2ef84c95 | 782 | |
61b73b12 | 783 | error_fp: |
799e2c4f MD |
784 | ret = close(fd); |
785 | if (ret) { | |
786 | PERROR("close"); | |
787 | } | |
2ef84c95 DG |
788 | error: |
789 | return -1; | |
790 | } | |
096102bd DG |
791 | |
792 | /* | |
793 | * Get kernel version and validate it. | |
794 | */ | |
795 | int kernel_validate_version(int tracer_fd) | |
796 | { | |
797 | int ret; | |
798 | struct lttng_kernel_tracer_version version; | |
c052142c | 799 | struct lttng_kernel_tracer_abi_version abi_version; |
096102bd DG |
800 | |
801 | ret = kernctl_tracer_version(tracer_fd, &version); | |
802 | if (ret < 0) { | |
803 | ERR("Failed at getting the lttng-modules version"); | |
804 | goto error; | |
805 | } | |
806 | ||
807 | /* Validate version */ | |
c052142c MD |
808 | if (version.major != VERSION_MAJOR) { |
809 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", | |
810 | version.major, VERSION_MAJOR); | |
096102bd | 811 | goto error_version; |
096102bd | 812 | } |
c052142c MD |
813 | ret = kernctl_tracer_abi_version(tracer_fd, &abi_version); |
814 | if (ret < 0) { | |
815 | ERR("Failed at getting lttng-modules ABI version"); | |
816 | goto error; | |
817 | } | |
818 | if (abi_version.major != LTTNG_MODULES_ABI_MAJOR_VERSION) { | |
819 | ERR("Kernel tracer ABI version (%d.%d) is not compatible with expected ABI major version (%d.*)", | |
820 | abi_version.major, abi_version.minor, | |
821 | LTTNG_MODULES_ABI_MAJOR_VERSION); | |
822 | goto error; | |
823 | } | |
824 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
825 | version.major, version.minor, | |
826 | abi_version.major, abi_version.minor); | |
096102bd DG |
827 | return 0; |
828 | ||
829 | error_version: | |
096102bd DG |
830 | ret = -1; |
831 | ||
832 | error: | |
833 | return ret; | |
834 | } | |
335a95b7 MD |
835 | |
836 | /* | |
837 | * Kernel work-arounds called at the start of sessiond main(). | |
838 | */ | |
839 | int init_kernel_workarounds(void) | |
840 | { | |
8936c33a | 841 | int ret; |
335a95b7 MD |
842 | FILE *fp; |
843 | ||
844 | /* | |
845 | * boot_id needs to be read once before being used concurrently | |
846 | * to deal with a Linux kernel race. A fix is proposed for | |
847 | * upstream, but the work-around is needed for older kernels. | |
848 | */ | |
849 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
850 | if (!fp) { | |
851 | goto end_boot_id; | |
852 | } | |
853 | while (!feof(fp)) { | |
854 | char buf[37] = ""; | |
855 | ||
8936c33a DG |
856 | ret = fread(buf, 1, sizeof(buf), fp); |
857 | if (ret < 0) { | |
858 | /* Ignore error, we don't really care */ | |
859 | } | |
335a95b7 | 860 | } |
799e2c4f MD |
861 | ret = fclose(fp); |
862 | if (ret) { | |
863 | PERROR("fclose"); | |
864 | } | |
335a95b7 | 865 | end_boot_id: |
335a95b7 MD |
866 | return 0; |
867 | } | |
2f77fc4b DG |
868 | |
869 | /* | |
870 | * Complete teardown of a kernel session. | |
871 | */ | |
872 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
873 | { | |
874 | if (ksess == NULL) { | |
875 | DBG3("No kernel session when tearing down session"); | |
876 | return; | |
877 | } | |
878 | ||
879 | DBG("Tearing down kernel session"); | |
880 | ||
07b86b52 | 881 | /* |
15dc512a DG |
882 | * Destroy channels on the consumer if at least one FD has been sent and we |
883 | * are in no output mode because the streams are in *no* monitor mode so we | |
884 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 885 | */ |
15dc512a | 886 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
887 | int ret; |
888 | struct consumer_socket *socket; | |
889 | struct lttng_ht_iter iter; | |
890 | ||
891 | /* For each consumer socket. */ | |
d069d577 | 892 | rcu_read_lock(); |
07b86b52 JD |
893 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
894 | socket, node.node) { | |
895 | struct ltt_kernel_channel *chan; | |
896 | ||
897 | /* For each channel, ask the consumer to destroy it. */ | |
898 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
899 | ret = kernel_consumer_destroy_channel(socket, chan); | |
900 | if (ret < 0) { | |
901 | /* Consumer is probably dead. Use next socket. */ | |
902 | continue; | |
903 | } | |
904 | } | |
905 | } | |
d069d577 | 906 | rcu_read_unlock(); |
07b86b52 JD |
907 | } |
908 | ||
2f77fc4b DG |
909 | /* Close any relayd session */ |
910 | consumer_output_send_destroy_relayd(ksess->consumer); | |
911 | ||
912 | trace_kernel_destroy_session(ksess); | |
913 | } | |
fb5f35b6 DG |
914 | |
915 | /* | |
916 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
917 | */ | |
918 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
919 | { | |
920 | struct ltt_kernel_session *ksess = NULL; | |
921 | ||
922 | assert(kchan); | |
923 | assert(kchan->channel); | |
924 | ||
925 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
926 | ||
927 | /* Update channel count of associated session. */ | |
928 | if (kchan->session) { | |
929 | /* Keep pointer reference so we can update it after the destroy. */ | |
930 | ksess = kchan->session; | |
931 | } | |
932 | ||
933 | trace_kernel_destroy_channel(kchan); | |
934 | ||
935 | /* | |
936 | * At this point the kernel channel is not visible anymore. This is safe | |
937 | * since in order to work on a visible kernel session, the tracing session | |
938 | * lock (ltt_session.lock) MUST be acquired. | |
939 | */ | |
940 | if (ksess) { | |
941 | ksess->channel_count--; | |
942 | } | |
943 | } | |
6dc3064a DG |
944 | |
945 | /* | |
946 | * Take a snapshot for a given kernel session. | |
947 | * | |
2a06df8d | 948 | * Return 0 on success or else return a LTTNG_ERR code. |
6dc3064a DG |
949 | */ |
950 | int kernel_snapshot_record(struct ltt_kernel_session *ksess, | |
d07ceecd MD |
951 | struct snapshot_output *output, int wait, |
952 | uint64_t nb_packets_per_stream) | |
6dc3064a | 953 | { |
2a06df8d | 954 | int err, ret, saved_metadata_fd; |
6dc3064a DG |
955 | struct consumer_socket *socket; |
956 | struct lttng_ht_iter iter; | |
957 | struct ltt_kernel_metadata *saved_metadata; | |
958 | ||
959 | assert(ksess); | |
960 | assert(ksess->consumer); | |
961 | assert(output); | |
962 | ||
963 | DBG("Kernel snapshot record started"); | |
964 | ||
965 | /* Save current metadata since the following calls will change it. */ | |
966 | saved_metadata = ksess->metadata; | |
967 | saved_metadata_fd = ksess->metadata_stream_fd; | |
968 | ||
969 | rcu_read_lock(); | |
970 | ||
971 | ret = kernel_open_metadata(ksess); | |
972 | if (ret < 0) { | |
973 | ret = LTTNG_ERR_KERN_META_FAIL; | |
974 | goto error; | |
975 | } | |
976 | ||
977 | ret = kernel_open_metadata_stream(ksess); | |
978 | if (ret < 0) { | |
979 | ret = LTTNG_ERR_KERN_META_FAIL; | |
980 | goto error_open_stream; | |
981 | } | |
982 | ||
983 | /* Send metadata to consumer and snapshot everything. */ | |
984 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
985 | socket, node.node) { | |
986 | struct consumer_output *saved_output; | |
987 | struct ltt_kernel_channel *chan; | |
6dc3064a DG |
988 | |
989 | /* | |
990 | * Temporarly switch consumer output for our snapshot output. As long | |
991 | * as the session lock is taken, this is safe. | |
992 | */ | |
993 | saved_output = ksess->consumer; | |
994 | ksess->consumer = output->consumer; | |
995 | ||
996 | pthread_mutex_lock(socket->lock); | |
997 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 998 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 999 | pthread_mutex_unlock(socket->lock); |
07b86b52 | 1000 | /* Put back the saved consumer output into the session. */ |
6dc3064a DG |
1001 | ksess->consumer = saved_output; |
1002 | if (ret < 0) { | |
1003 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1004 | goto error_consumer; | |
1005 | } | |
1006 | ||
1007 | /* For each channel, ask the consumer to snapshot it. */ | |
1008 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
07b86b52 | 1009 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1010 | ret = consumer_snapshot_channel(socket, chan->fd, output, 0, |
5c786ded JD |
1011 | ksess->uid, ksess->gid, |
1012 | DEFAULT_KERNEL_TRACE_DIR, wait, | |
d07ceecd | 1013 | nb_packets_per_stream); |
07b86b52 | 1014 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
1015 | if (ret < 0) { |
1016 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
2a06df8d DG |
1017 | (void) kernel_consumer_destroy_metadata(socket, |
1018 | ksess->metadata); | |
6dc3064a DG |
1019 | goto error_consumer; |
1020 | } | |
1021 | } | |
1022 | ||
1023 | /* Snapshot metadata, */ | |
07b86b52 | 1024 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1025 | ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output, |
5c786ded | 1026 | 1, ksess->uid, ksess->gid, |
d07ceecd | 1027 | DEFAULT_KERNEL_TRACE_DIR, wait, 0); |
07b86b52 | 1028 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
1029 | if (ret < 0) { |
1030 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1031 | goto error_consumer; | |
1032 | } | |
07b86b52 JD |
1033 | |
1034 | /* | |
1035 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1036 | * it's not monitored on the consumer side. | |
1037 | */ | |
1038 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1039 | } |
1040 | ||
fac41e72 DG |
1041 | ret = LTTNG_OK; |
1042 | ||
6dc3064a DG |
1043 | error_consumer: |
1044 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1045 | err = close(ksess->metadata_stream_fd); |
1046 | if (err < 0) { | |
6dc3064a DG |
1047 | PERROR("close snapshot kernel"); |
1048 | } | |
1049 | ||
1050 | error_open_stream: | |
1051 | trace_kernel_destroy_metadata(ksess->metadata); | |
1052 | error: | |
1053 | /* Restore metadata state.*/ | |
1054 | ksess->metadata = saved_metadata; | |
1055 | ksess->metadata_stream_fd = saved_metadata_fd; | |
1056 | ||
1057 | rcu_read_unlock(); | |
1058 | return ret; | |
1059 | } | |
834978fd DG |
1060 | |
1061 | /* | |
1062 | * Get the syscall mask array from the kernel tracer. | |
1063 | * | |
1064 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1065 | * be freed. | |
1066 | */ | |
1067 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1068 | { | |
1069 | assert(syscall_mask); | |
1070 | assert(nr_bits); | |
1071 | ||
1072 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1073 | } |