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 | ||
6c1c0768 | 18 | #define _LGPL_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> |
c052142c | 29 | #include <common/kernel-ctl/kernel-ioctl.h> |
42224349 | 30 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 31 | |
2f77fc4b | 32 | #include "consumer.h" |
4771f025 | 33 | #include "kernel.h" |
6dc3064a | 34 | #include "kernel-consumer.h" |
096102bd | 35 | #include "kern-modules.h" |
834978fd | 36 | #include "utils.h" |
20fe2104 | 37 | |
d65106b1 | 38 | /* |
050349bb | 39 | * Add context on a kernel channel. |
d65106b1 DG |
40 | */ |
41 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 42 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
43 | { |
44 | int ret; | |
45 | ||
0525e9ae DG |
46 | assert(chan); |
47 | assert(ctx); | |
48 | ||
d65106b1 | 49 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 50 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 51 | if (ret < 0) { |
b579acd9 | 52 | if (errno != EEXIST) { |
df0f840b | 53 | PERROR("add context ioctl"); |
b579acd9 DG |
54 | } else { |
55 | /* If EEXIST, we just ignore the error */ | |
56 | ret = 0; | |
57 | } | |
d65106b1 DG |
58 | goto error; |
59 | } | |
60 | ||
645328ae | 61 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
d65106b1 DG |
62 | |
63 | return 0; | |
64 | ||
65 | error: | |
66 | return ret; | |
67 | } | |
68 | ||
20fe2104 | 69 | /* |
050349bb DG |
70 | * Create a new kernel session, register it to the kernel tracer and add it to |
71 | * the session daemon session. | |
20fe2104 | 72 | */ |
8c0faa1d | 73 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
74 | { |
75 | int ret; | |
76 | struct ltt_kernel_session *lks; | |
77 | ||
0525e9ae DG |
78 | assert(session); |
79 | ||
54012638 | 80 | /* Allocate data structure */ |
dec56f6c | 81 | lks = trace_kernel_create_session(); |
20fe2104 | 82 | if (lks == NULL) { |
54012638 | 83 | ret = -1; |
20fe2104 DG |
84 | goto error; |
85 | } | |
86 | ||
54012638 | 87 | /* Kernel tracer session creation */ |
20fe2104 DG |
88 | ret = kernctl_create_session(tracer_fd); |
89 | if (ret < 0) { | |
df0f840b | 90 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
91 | goto error; |
92 | } | |
93 | ||
20fe2104 | 94 | lks->fd = ret; |
7b395890 DG |
95 | /* Prevent fd duplication after execlp() */ |
96 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
97 | if (ret < 0) { | |
df0f840b | 98 | PERROR("fcntl session fd"); |
7b395890 DG |
99 | } |
100 | ||
53632229 | 101 | lks->id = session->id; |
3bd1e081 | 102 | lks->consumer_fds_sent = 0; |
8c0faa1d | 103 | session->kernel_session = lks; |
8c0faa1d DG |
104 | |
105 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
106 | |
107 | return 0; | |
108 | ||
109 | error: | |
5f62c685 DG |
110 | if (lks) { |
111 | trace_kernel_destroy_session(lks); | |
112 | } | |
20fe2104 DG |
113 | return ret; |
114 | } | |
115 | ||
116 | /* | |
050349bb DG |
117 | * Create a kernel channel, register it to the kernel tracer and add it to the |
118 | * kernel session. | |
20fe2104 | 119 | */ |
050349bb | 120 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 121 | struct lttng_channel *chan) |
20fe2104 DG |
122 | { |
123 | int ret; | |
124 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 125 | |
0525e9ae DG |
126 | assert(session); |
127 | assert(chan); | |
0525e9ae | 128 | |
54012638 | 129 | /* Allocate kernel channel */ |
fdd9eb17 | 130 | lkc = trace_kernel_create_channel(chan); |
54012638 | 131 | if (lkc == NULL) { |
20fe2104 DG |
132 | goto error; |
133 | } | |
134 | ||
ecc48a90 | 135 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 136 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
137 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
138 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 139 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 140 | |
54012638 | 141 | /* Kernel tracer channel creation */ |
f3ed775e | 142 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 143 | if (ret < 0) { |
df0f840b | 144 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
145 | goto error; |
146 | } | |
147 | ||
54012638 | 148 | /* Setup the channel fd */ |
20fe2104 | 149 | lkc->fd = ret; |
7b395890 DG |
150 | /* Prevent fd duplication after execlp() */ |
151 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
152 | if (ret < 0) { | |
df0f840b | 153 | PERROR("fcntl session fd"); |
7b395890 DG |
154 | } |
155 | ||
54012638 | 156 | /* Add channel to session */ |
8c0faa1d DG |
157 | cds_list_add(&lkc->list, &session->channel_list.head); |
158 | session->channel_count++; | |
fb5f35b6 | 159 | lkc->session = session; |
20fe2104 | 160 | |
00e2e675 | 161 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
20fe2104 DG |
162 | |
163 | return 0; | |
164 | ||
165 | error: | |
5f62c685 DG |
166 | if (lkc) { |
167 | free(lkc->channel); | |
168 | free(lkc); | |
169 | } | |
54012638 | 170 | return -1; |
20fe2104 | 171 | } |
f34daff7 DG |
172 | |
173 | /* | |
050349bb DG |
174 | * Create a kernel event, enable it to the kernel tracer and add it to the |
175 | * channel event list of the kernel session. | |
49d21f93 | 176 | * We own filter_expression and filter. |
f34daff7 | 177 | */ |
050349bb | 178 | int kernel_create_event(struct lttng_event *ev, |
00a62084 MD |
179 | struct ltt_kernel_channel *channel, |
180 | char *filter_expression, | |
181 | struct lttng_filter_bytecode *filter) | |
f34daff7 DG |
182 | { |
183 | int ret; | |
184 | struct ltt_kernel_event *event; | |
f34daff7 | 185 | |
0525e9ae DG |
186 | assert(ev); |
187 | assert(channel); | |
188 | ||
a969e101 | 189 | /* We pass ownership of filter_expression and filter */ |
00a62084 MD |
190 | event = trace_kernel_create_event(ev, filter_expression, |
191 | filter); | |
54012638 | 192 | if (event == NULL) { |
d87bfb32 | 193 | ret = -1; |
f34daff7 DG |
194 | goto error; |
195 | } | |
196 | ||
f3ed775e DG |
197 | ret = kernctl_create_event(channel->fd, event->event); |
198 | if (ret < 0) { | |
bd29c13d DG |
199 | switch (errno) { |
200 | case EEXIST: | |
201 | break; | |
202 | case ENOSYS: | |
203 | WARN("Event type not implemented"); | |
204 | break; | |
8197a339 DG |
205 | case ENOENT: |
206 | WARN("Event %s not found!", ev->name); | |
207 | break; | |
bd29c13d | 208 | default: |
d87bfb32 DG |
209 | PERROR("create event ioctl"); |
210 | } | |
211 | ret = -errno; | |
e953ef25 | 212 | goto free_event; |
8c0faa1d | 213 | } |
f34daff7 | 214 | |
d0ae4ea8 | 215 | event->type = ev->type; |
f3ed775e | 216 | event->fd = ret; |
7b395890 DG |
217 | /* Prevent fd duplication after execlp() */ |
218 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
219 | if (ret < 0) { | |
df0f840b | 220 | PERROR("fcntl session fd"); |
7b395890 DG |
221 | } |
222 | ||
00a62084 MD |
223 | if (filter) { |
224 | ret = kernctl_filter(event->fd, filter); | |
225 | if (ret) { | |
226 | goto filter_error; | |
227 | } | |
228 | } | |
229 | ||
230 | ret = kernctl_enable(event->fd); | |
231 | if (ret < 0) { | |
232 | switch (errno) { | |
233 | case EEXIST: | |
234 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
235 | break; | |
236 | default: | |
237 | PERROR("enable kernel event"); | |
238 | break; | |
239 | } | |
240 | goto enable_error; | |
241 | } | |
242 | ||
f3ed775e DG |
243 | /* Add event to event list */ |
244 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
245 | channel->event_count++; |
246 | ||
e953ef25 DG |
247 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
248 | ||
249 | return 0; | |
250 | ||
00a62084 MD |
251 | enable_error: |
252 | filter_error: | |
253 | { | |
254 | int closeret; | |
255 | ||
256 | closeret = close(event->fd); | |
257 | if (closeret) { | |
258 | PERROR("close event fd"); | |
259 | } | |
260 | } | |
e953ef25 DG |
261 | free_event: |
262 | free(event); | |
263 | error: | |
d87bfb32 | 264 | return ret; |
e953ef25 DG |
265 | } |
266 | ||
26cc6b4e | 267 | /* |
050349bb | 268 | * Disable a kernel channel. |
26cc6b4e DG |
269 | */ |
270 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
271 | { | |
272 | int ret; | |
273 | ||
0525e9ae DG |
274 | assert(chan); |
275 | ||
26cc6b4e DG |
276 | ret = kernctl_disable(chan->fd); |
277 | if (ret < 0) { | |
df0f840b | 278 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
279 | ret = errno; |
280 | goto error; | |
281 | } | |
282 | ||
283 | chan->enabled = 0; | |
284 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); | |
285 | ||
286 | return 0; | |
287 | ||
288 | error: | |
289 | return ret; | |
290 | } | |
291 | ||
d36b8583 | 292 | /* |
050349bb | 293 | * Enable a kernel channel. |
d36b8583 DG |
294 | */ |
295 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
296 | { | |
297 | int ret; | |
298 | ||
0525e9ae DG |
299 | assert(chan); |
300 | ||
d36b8583 | 301 | ret = kernctl_enable(chan->fd); |
54d01ffb | 302 | if (ret < 0 && errno != EEXIST) { |
df0f840b | 303 | PERROR("Enable kernel chan"); |
d36b8583 DG |
304 | goto error; |
305 | } | |
306 | ||
307 | chan->enabled = 1; | |
308 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); | |
309 | ||
310 | return 0; | |
311 | ||
312 | error: | |
313 | return ret; | |
314 | } | |
315 | ||
19e70852 | 316 | /* |
050349bb | 317 | * Enable a kernel event. |
19e70852 DG |
318 | */ |
319 | int kernel_enable_event(struct ltt_kernel_event *event) | |
320 | { | |
321 | int ret; | |
322 | ||
0525e9ae DG |
323 | assert(event); |
324 | ||
19e70852 | 325 | ret = kernctl_enable(event->fd); |
42224349 DG |
326 | if (ret < 0) { |
327 | switch (errno) { | |
328 | case EEXIST: | |
f73fabfd | 329 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
330 | break; |
331 | default: | |
332 | PERROR("enable kernel event"); | |
333 | break; | |
334 | } | |
19e70852 DG |
335 | goto error; |
336 | } | |
337 | ||
338 | event->enabled = 1; | |
339 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
340 | ||
341 | return 0; | |
342 | ||
343 | error: | |
d36b8583 | 344 | return ret; |
19e70852 DG |
345 | } |
346 | ||
e953ef25 | 347 | /* |
050349bb | 348 | * Disable a kernel event. |
e953ef25 | 349 | */ |
19e70852 | 350 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
351 | { |
352 | int ret; | |
19e70852 | 353 | |
0525e9ae DG |
354 | assert(event); |
355 | ||
19e70852 | 356 | ret = kernctl_disable(event->fd); |
42224349 DG |
357 | if (ret < 0) { |
358 | switch (errno) { | |
359 | case EEXIST: | |
f73fabfd | 360 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
361 | break; |
362 | default: | |
363 | PERROR("disable kernel event"); | |
364 | break; | |
365 | } | |
19e70852 | 366 | goto error; |
e953ef25 | 367 | } |
f3ed775e | 368 | |
19e70852 DG |
369 | event->enabled = 0; |
370 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
371 | ||
f34daff7 DG |
372 | return 0; |
373 | ||
374 | error: | |
d36b8583 | 375 | return ret; |
f34daff7 | 376 | } |
aaf26714 | 377 | |
6e911cad | 378 | |
ccf10263 MD |
379 | int kernel_track_pid(struct ltt_kernel_session *session, int pid) |
380 | { | |
7c493d31 MD |
381 | int ret; |
382 | ||
ccf10263 MD |
383 | DBG("Kernel track PID %d for session id %" PRIu64 ".", |
384 | pid, session->id); | |
7c493d31 MD |
385 | ret = kernctl_track_pid(session->fd, pid); |
386 | if (!ret) { | |
387 | return LTTNG_OK; | |
388 | } | |
389 | switch (errno) { | |
390 | case EINVAL: | |
391 | return LTTNG_ERR_INVALID; | |
392 | case ENOMEM: | |
393 | return LTTNG_ERR_NOMEM; | |
394 | case EEXIST: | |
395 | return LTTNG_ERR_PID_TRACKED; | |
396 | default: | |
397 | return LTTNG_ERR_UNK; | |
398 | } | |
ccf10263 MD |
399 | } |
400 | ||
401 | int kernel_untrack_pid(struct ltt_kernel_session *session, int pid) | |
402 | { | |
7c493d31 MD |
403 | int ret; |
404 | ||
ccf10263 MD |
405 | DBG("Kernel untrack PID %d for session id %" PRIu64 ".", |
406 | pid, session->id); | |
7c493d31 MD |
407 | ret = kernctl_untrack_pid(session->fd, pid); |
408 | if (!ret) { | |
409 | return LTTNG_OK; | |
410 | } | |
411 | switch (errno) { | |
412 | case EINVAL: | |
413 | return LTTNG_ERR_INVALID; | |
414 | case ENOMEM: | |
415 | return LTTNG_ERR_NOMEM; | |
416 | case ENOENT: | |
417 | return LTTNG_ERR_PID_NOT_TRACKED; | |
418 | default: | |
419 | return LTTNG_ERR_UNK; | |
420 | } | |
ccf10263 MD |
421 | } |
422 | ||
a5dfbb9d MD |
423 | ssize_t kernel_list_tracker_pids(struct ltt_kernel_session *session, |
424 | int **_pids) | |
425 | { | |
426 | int fd, ret; | |
427 | int pid; | |
428 | ssize_t nbmem, count = 0; | |
429 | FILE *fp; | |
430 | int *pids; | |
431 | ||
432 | fd = kernctl_list_tracker_pids(session->fd); | |
433 | if (fd < 0) { | |
434 | PERROR("kernel tracker pids list"); | |
435 | goto error; | |
436 | } | |
437 | ||
438 | fp = fdopen(fd, "r"); | |
439 | if (fp == NULL) { | |
440 | PERROR("kernel tracker pids list fdopen"); | |
441 | goto error_fp; | |
442 | } | |
443 | ||
444 | nbmem = KERNEL_TRACKER_PIDS_INIT_LIST_SIZE; | |
445 | pids = zmalloc(sizeof(*pids) * nbmem); | |
446 | if (pids == NULL) { | |
447 | PERROR("alloc list pids"); | |
448 | count = -ENOMEM; | |
449 | goto end; | |
450 | } | |
451 | ||
452 | while (fscanf(fp, "process { pid = %u; };\n", &pid) == 1) { | |
453 | if (count >= nbmem) { | |
454 | int *new_pids; | |
455 | size_t new_nbmem; | |
456 | ||
457 | new_nbmem = nbmem << 1; | |
458 | DBG("Reallocating pids list from %zu to %zu entries", | |
459 | nbmem, new_nbmem); | |
460 | new_pids = realloc(pids, new_nbmem * sizeof(*new_pids)); | |
461 | if (new_pids == NULL) { | |
462 | PERROR("realloc list events"); | |
463 | free(pids); | |
464 | count = -ENOMEM; | |
465 | goto end; | |
466 | } | |
467 | /* Zero the new memory */ | |
468 | memset(new_pids + nbmem, 0, | |
469 | (new_nbmem - nbmem) * sizeof(*new_pids)); | |
470 | nbmem = new_nbmem; | |
471 | pids = new_pids; | |
472 | } | |
473 | pids[count++] = pid; | |
474 | } | |
475 | ||
476 | *_pids = pids; | |
477 | DBG("Kernel list tracker pids done (%zd pids)", count); | |
478 | end: | |
479 | ret = fclose(fp); /* closes both fp and fd */ | |
480 | if (ret) { | |
481 | PERROR("fclose"); | |
482 | } | |
483 | return count; | |
484 | ||
485 | error_fp: | |
486 | ret = close(fd); | |
487 | if (ret) { | |
488 | PERROR("close"); | |
489 | } | |
490 | error: | |
491 | return -1; | |
492 | } | |
493 | ||
aaf26714 | 494 | /* |
050349bb DG |
495 | * Create kernel metadata, open from the kernel tracer and add it to the |
496 | * kernel session. | |
aaf26714 | 497 | */ |
a4b92340 | 498 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
499 | { |
500 | int ret; | |
74024a21 | 501 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 502 | |
0525e9ae DG |
503 | assert(session); |
504 | ||
54012638 | 505 | /* Allocate kernel metadata */ |
a4b92340 | 506 | lkm = trace_kernel_create_metadata(); |
54012638 | 507 | if (lkm == NULL) { |
aaf26714 DG |
508 | goto error; |
509 | } | |
510 | ||
54012638 | 511 | /* Kernel tracer metadata creation */ |
f3ed775e | 512 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 513 | if (ret < 0) { |
74024a21 | 514 | goto error_open; |
aaf26714 DG |
515 | } |
516 | ||
8c0faa1d | 517 | lkm->fd = ret; |
7b395890 DG |
518 | /* Prevent fd duplication after execlp() */ |
519 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
520 | if (ret < 0) { | |
df0f840b | 521 | PERROR("fcntl session fd"); |
7b395890 DG |
522 | } |
523 | ||
aaf26714 | 524 | session->metadata = lkm; |
8c0faa1d | 525 | |
00e2e675 | 526 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
527 | |
528 | return 0; | |
529 | ||
74024a21 DG |
530 | error_open: |
531 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 532 | error: |
54012638 | 533 | return -1; |
8c0faa1d DG |
534 | } |
535 | ||
536 | /* | |
050349bb | 537 | * Start tracing session. |
8c0faa1d DG |
538 | */ |
539 | int kernel_start_session(struct ltt_kernel_session *session) | |
540 | { | |
541 | int ret; | |
542 | ||
0525e9ae DG |
543 | assert(session); |
544 | ||
8c0faa1d DG |
545 | ret = kernctl_start_session(session->fd); |
546 | if (ret < 0) { | |
df0f840b | 547 | PERROR("ioctl start session"); |
8c0faa1d DG |
548 | goto error; |
549 | } | |
550 | ||
551 | DBG("Kernel session started"); | |
552 | ||
553 | return 0; | |
554 | ||
555 | error: | |
556 | return ret; | |
557 | } | |
558 | ||
f3ed775e | 559 | /* |
050349bb | 560 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
561 | */ |
562 | void kernel_wait_quiescent(int fd) | |
563 | { | |
564 | int ret; | |
565 | ||
566 | DBG("Kernel quiescent wait on %d", fd); | |
567 | ||
568 | ret = kernctl_wait_quiescent(fd); | |
569 | if (ret < 0) { | |
df0f840b | 570 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
571 | ERR("Kernel quiescent wait failed"); |
572 | } | |
573 | } | |
574 | ||
d0254c7c | 575 | /* |
050349bb | 576 | * Kernel calibrate |
d0254c7c MD |
577 | */ |
578 | int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
579 | { | |
580 | int ret; | |
581 | ||
0525e9ae DG |
582 | assert(calibrate); |
583 | ||
d0254c7c MD |
584 | ret = kernctl_calibrate(fd, calibrate); |
585 | if (ret < 0) { | |
df0f840b | 586 | PERROR("calibrate ioctl"); |
d0254c7c MD |
587 | return -1; |
588 | } | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
593 | ||
f3ed775e | 594 | /* |
f3ed775e DG |
595 | * Force flush buffer of metadata. |
596 | */ | |
597 | int kernel_metadata_flush_buffer(int fd) | |
598 | { | |
599 | int ret; | |
600 | ||
169d2cb7 DG |
601 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
602 | ||
f3ed775e DG |
603 | ret = kernctl_buffer_flush(fd); |
604 | if (ret < 0) { | |
00e2e675 | 605 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
606 | } |
607 | ||
608 | return 0; | |
609 | } | |
610 | ||
611 | /* | |
050349bb | 612 | * Force flush buffer for channel. |
f3ed775e DG |
613 | */ |
614 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
615 | { | |
616 | int ret; | |
617 | struct ltt_kernel_stream *stream; | |
618 | ||
0525e9ae DG |
619 | assert(channel); |
620 | ||
f3ed775e DG |
621 | DBG("Flush buffer for channel %s", channel->channel->name); |
622 | ||
623 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
624 | DBG("Flushing channel stream %d", stream->fd); | |
625 | ret = kernctl_buffer_flush(stream->fd); | |
626 | if (ret < 0) { | |
df0f840b | 627 | PERROR("ioctl"); |
f3ed775e DG |
628 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
629 | stream->fd, ret); | |
630 | } | |
631 | } | |
632 | ||
633 | return 0; | |
634 | } | |
635 | ||
8c0faa1d | 636 | /* |
050349bb | 637 | * Stop tracing session. |
8c0faa1d DG |
638 | */ |
639 | int kernel_stop_session(struct ltt_kernel_session *session) | |
640 | { | |
641 | int ret; | |
642 | ||
0525e9ae DG |
643 | assert(session); |
644 | ||
8c0faa1d DG |
645 | ret = kernctl_stop_session(session->fd); |
646 | if (ret < 0) { | |
647 | goto error; | |
648 | } | |
649 | ||
650 | DBG("Kernel session stopped"); | |
651 | ||
652 | return 0; | |
653 | ||
654 | error: | |
655 | return ret; | |
656 | } | |
657 | ||
658 | /* | |
050349bb DG |
659 | * Open stream of channel, register it to the kernel tracer and add it |
660 | * to the stream list of the channel. | |
8c0faa1d | 661 | * |
050349bb | 662 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 663 | */ |
f3ed775e | 664 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 665 | { |
00e2e675 | 666 | int ret, count = 0; |
8c0faa1d DG |
667 | struct ltt_kernel_stream *lks; |
668 | ||
0525e9ae DG |
669 | assert(channel); |
670 | ||
5a47c6a2 | 671 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
00e2e675 | 672 | lks = trace_kernel_create_stream(channel->channel->name, count); |
8c0faa1d | 673 | if (lks == NULL) { |
799e2c4f MD |
674 | ret = close(ret); |
675 | if (ret) { | |
676 | PERROR("close"); | |
677 | } | |
8c0faa1d DG |
678 | goto error; |
679 | } | |
680 | ||
681 | lks->fd = ret; | |
7b395890 DG |
682 | /* Prevent fd duplication after execlp() */ |
683 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
684 | if (ret < 0) { | |
df0f840b | 685 | PERROR("fcntl session fd"); |
7b395890 DG |
686 | } |
687 | ||
1624d5b7 JD |
688 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
689 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
690 | ||
54012638 | 691 | /* Add stream to channe stream list */ |
8c0faa1d DG |
692 | cds_list_add(&lks->list, &channel->stream_list.head); |
693 | channel->stream_count++; | |
8c0faa1d | 694 | |
00e2e675 DG |
695 | /* Increment counter which represent CPU number. */ |
696 | count++; | |
697 | ||
698 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, | |
699 | lks->state); | |
54012638 | 700 | } |
8c0faa1d DG |
701 | |
702 | return channel->stream_count; | |
703 | ||
704 | error: | |
54012638 | 705 | return -1; |
8c0faa1d DG |
706 | } |
707 | ||
708 | /* | |
050349bb | 709 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 710 | */ |
f3ed775e | 711 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
712 | { |
713 | int ret; | |
714 | ||
0525e9ae DG |
715 | assert(session); |
716 | ||
8c0faa1d DG |
717 | ret = kernctl_create_stream(session->metadata->fd); |
718 | if (ret < 0) { | |
df0f840b | 719 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
720 | goto error; |
721 | } | |
722 | ||
723 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
724 | session->metadata_stream_fd = ret; | |
7b395890 DG |
725 | /* Prevent fd duplication after execlp() */ |
726 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
727 | if (ret < 0) { | |
df0f840b | 728 | PERROR("fcntl session fd"); |
7b395890 | 729 | } |
aaf26714 DG |
730 | |
731 | return 0; | |
732 | ||
733 | error: | |
54012638 | 734 | return -1; |
aaf26714 | 735 | } |
2ef84c95 DG |
736 | |
737 | /* | |
9f19cc17 | 738 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 739 | */ |
9f19cc17 | 740 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 741 | { |
53efb85a | 742 | int fd, ret; |
9f19cc17 DG |
743 | char *event; |
744 | size_t nbmem, count = 0; | |
2ef84c95 | 745 | FILE *fp; |
9f19cc17 | 746 | struct lttng_event *elist; |
2ef84c95 | 747 | |
0525e9ae DG |
748 | assert(events); |
749 | ||
2ef84c95 DG |
750 | fd = kernctl_tracepoint_list(tracer_fd); |
751 | if (fd < 0) { | |
df0f840b | 752 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
753 | goto error; |
754 | } | |
755 | ||
756 | fp = fdopen(fd, "r"); | |
757 | if (fp == NULL) { | |
df0f840b | 758 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 759 | goto error_fp; |
2ef84c95 DG |
760 | } |
761 | ||
762 | /* | |
763 | * Init memory size counter | |
764 | * See kernel-ctl.h for explanation of this value | |
765 | */ | |
6725fe19 | 766 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 767 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
768 | if (elist == NULL) { |
769 | PERROR("alloc list events"); | |
770 | count = -ENOMEM; | |
771 | goto end; | |
772 | } | |
2ef84c95 | 773 | |
53efb85a | 774 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 775 | if (count >= nbmem) { |
3b870559 | 776 | struct lttng_event *new_elist; |
53efb85a | 777 | size_t new_nbmem; |
3b870559 | 778 | |
53efb85a MD |
779 | new_nbmem = nbmem << 1; |
780 | DBG("Reallocating event list from %zu to %zu bytes", | |
781 | nbmem, new_nbmem); | |
782 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 783 | if (new_elist == NULL) { |
df0f840b | 784 | PERROR("realloc list events"); |
3b870559 MD |
785 | free(event); |
786 | free(elist); | |
61b73b12 MD |
787 | count = -ENOMEM; |
788 | goto end; | |
2ef84c95 | 789 | } |
53efb85a MD |
790 | /* Zero the new memory */ |
791 | memset(new_elist + nbmem, 0, | |
792 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
793 | nbmem = new_nbmem; | |
3b870559 | 794 | elist = new_elist; |
2ef84c95 | 795 | } |
99497cd0 MD |
796 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
797 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 798 | elist[count].enabled = -1; |
9f19cc17 | 799 | count++; |
3b870559 | 800 | free(event); |
2ef84c95 DG |
801 | } |
802 | ||
9f19cc17 | 803 | *events = elist; |
ced2f820 | 804 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 805 | end: |
799e2c4f MD |
806 | ret = fclose(fp); /* closes both fp and fd */ |
807 | if (ret) { | |
808 | PERROR("fclose"); | |
809 | } | |
9f19cc17 | 810 | return count; |
2ef84c95 | 811 | |
61b73b12 | 812 | error_fp: |
799e2c4f MD |
813 | ret = close(fd); |
814 | if (ret) { | |
815 | PERROR("close"); | |
816 | } | |
2ef84c95 DG |
817 | error: |
818 | return -1; | |
819 | } | |
096102bd DG |
820 | |
821 | /* | |
822 | * Get kernel version and validate it. | |
823 | */ | |
824 | int kernel_validate_version(int tracer_fd) | |
825 | { | |
826 | int ret; | |
827 | struct lttng_kernel_tracer_version version; | |
c052142c | 828 | struct lttng_kernel_tracer_abi_version abi_version; |
096102bd DG |
829 | |
830 | ret = kernctl_tracer_version(tracer_fd, &version); | |
831 | if (ret < 0) { | |
832 | ERR("Failed at getting the lttng-modules version"); | |
833 | goto error; | |
834 | } | |
835 | ||
836 | /* Validate version */ | |
c052142c MD |
837 | if (version.major != VERSION_MAJOR) { |
838 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", | |
839 | version.major, VERSION_MAJOR); | |
096102bd | 840 | goto error_version; |
096102bd | 841 | } |
c052142c MD |
842 | ret = kernctl_tracer_abi_version(tracer_fd, &abi_version); |
843 | if (ret < 0) { | |
844 | ERR("Failed at getting lttng-modules ABI version"); | |
845 | goto error; | |
846 | } | |
847 | if (abi_version.major != LTTNG_MODULES_ABI_MAJOR_VERSION) { | |
848 | ERR("Kernel tracer ABI version (%d.%d) is not compatible with expected ABI major version (%d.*)", | |
849 | abi_version.major, abi_version.minor, | |
850 | LTTNG_MODULES_ABI_MAJOR_VERSION); | |
851 | goto error; | |
852 | } | |
853 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
854 | version.major, version.minor, | |
855 | abi_version.major, abi_version.minor); | |
096102bd DG |
856 | return 0; |
857 | ||
858 | error_version: | |
096102bd DG |
859 | ret = -1; |
860 | ||
861 | error: | |
862 | return ret; | |
863 | } | |
335a95b7 MD |
864 | |
865 | /* | |
866 | * Kernel work-arounds called at the start of sessiond main(). | |
867 | */ | |
868 | int init_kernel_workarounds(void) | |
869 | { | |
8936c33a | 870 | int ret; |
335a95b7 MD |
871 | FILE *fp; |
872 | ||
873 | /* | |
874 | * boot_id needs to be read once before being used concurrently | |
875 | * to deal with a Linux kernel race. A fix is proposed for | |
876 | * upstream, but the work-around is needed for older kernels. | |
877 | */ | |
878 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
879 | if (!fp) { | |
880 | goto end_boot_id; | |
881 | } | |
882 | while (!feof(fp)) { | |
883 | char buf[37] = ""; | |
884 | ||
8936c33a DG |
885 | ret = fread(buf, 1, sizeof(buf), fp); |
886 | if (ret < 0) { | |
887 | /* Ignore error, we don't really care */ | |
888 | } | |
335a95b7 | 889 | } |
799e2c4f MD |
890 | ret = fclose(fp); |
891 | if (ret) { | |
892 | PERROR("fclose"); | |
893 | } | |
335a95b7 | 894 | end_boot_id: |
335a95b7 MD |
895 | return 0; |
896 | } | |
2f77fc4b DG |
897 | |
898 | /* | |
899 | * Complete teardown of a kernel session. | |
900 | */ | |
901 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
902 | { | |
903 | if (ksess == NULL) { | |
904 | DBG3("No kernel session when tearing down session"); | |
905 | return; | |
906 | } | |
907 | ||
908 | DBG("Tearing down kernel session"); | |
909 | ||
07b86b52 | 910 | /* |
15dc512a DG |
911 | * Destroy channels on the consumer if at least one FD has been sent and we |
912 | * are in no output mode because the streams are in *no* monitor mode so we | |
913 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 914 | */ |
15dc512a | 915 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
916 | int ret; |
917 | struct consumer_socket *socket; | |
918 | struct lttng_ht_iter iter; | |
919 | ||
920 | /* For each consumer socket. */ | |
d069d577 | 921 | rcu_read_lock(); |
07b86b52 JD |
922 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
923 | socket, node.node) { | |
924 | struct ltt_kernel_channel *chan; | |
925 | ||
926 | /* For each channel, ask the consumer to destroy it. */ | |
927 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
928 | ret = kernel_consumer_destroy_channel(socket, chan); | |
929 | if (ret < 0) { | |
930 | /* Consumer is probably dead. Use next socket. */ | |
931 | continue; | |
932 | } | |
933 | } | |
934 | } | |
d069d577 | 935 | rcu_read_unlock(); |
07b86b52 JD |
936 | } |
937 | ||
2f77fc4b DG |
938 | /* Close any relayd session */ |
939 | consumer_output_send_destroy_relayd(ksess->consumer); | |
940 | ||
941 | trace_kernel_destroy_session(ksess); | |
942 | } | |
fb5f35b6 DG |
943 | |
944 | /* | |
945 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
946 | */ | |
947 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
948 | { | |
949 | struct ltt_kernel_session *ksess = NULL; | |
950 | ||
951 | assert(kchan); | |
952 | assert(kchan->channel); | |
953 | ||
954 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
955 | ||
956 | /* Update channel count of associated session. */ | |
957 | if (kchan->session) { | |
958 | /* Keep pointer reference so we can update it after the destroy. */ | |
959 | ksess = kchan->session; | |
960 | } | |
961 | ||
962 | trace_kernel_destroy_channel(kchan); | |
963 | ||
964 | /* | |
965 | * At this point the kernel channel is not visible anymore. This is safe | |
966 | * since in order to work on a visible kernel session, the tracing session | |
967 | * lock (ltt_session.lock) MUST be acquired. | |
968 | */ | |
969 | if (ksess) { | |
970 | ksess->channel_count--; | |
971 | } | |
972 | } | |
6dc3064a DG |
973 | |
974 | /* | |
975 | * Take a snapshot for a given kernel session. | |
976 | * | |
2a06df8d | 977 | * Return 0 on success or else return a LTTNG_ERR code. |
6dc3064a DG |
978 | */ |
979 | int kernel_snapshot_record(struct ltt_kernel_session *ksess, | |
d07ceecd MD |
980 | struct snapshot_output *output, int wait, |
981 | uint64_t nb_packets_per_stream) | |
6dc3064a | 982 | { |
2a06df8d | 983 | int err, ret, saved_metadata_fd; |
6dc3064a DG |
984 | struct consumer_socket *socket; |
985 | struct lttng_ht_iter iter; | |
986 | struct ltt_kernel_metadata *saved_metadata; | |
987 | ||
988 | assert(ksess); | |
989 | assert(ksess->consumer); | |
990 | assert(output); | |
991 | ||
992 | DBG("Kernel snapshot record started"); | |
993 | ||
994 | /* Save current metadata since the following calls will change it. */ | |
995 | saved_metadata = ksess->metadata; | |
996 | saved_metadata_fd = ksess->metadata_stream_fd; | |
997 | ||
998 | rcu_read_lock(); | |
999 | ||
1000 | ret = kernel_open_metadata(ksess); | |
1001 | if (ret < 0) { | |
1002 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1003 | goto error; | |
1004 | } | |
1005 | ||
1006 | ret = kernel_open_metadata_stream(ksess); | |
1007 | if (ret < 0) { | |
1008 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1009 | goto error_open_stream; | |
1010 | } | |
1011 | ||
1012 | /* Send metadata to consumer and snapshot everything. */ | |
1013 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1014 | socket, node.node) { | |
1015 | struct consumer_output *saved_output; | |
1016 | struct ltt_kernel_channel *chan; | |
6dc3064a DG |
1017 | |
1018 | /* | |
1019 | * Temporarly switch consumer output for our snapshot output. As long | |
1020 | * as the session lock is taken, this is safe. | |
1021 | */ | |
1022 | saved_output = ksess->consumer; | |
1023 | ksess->consumer = output->consumer; | |
1024 | ||
1025 | pthread_mutex_lock(socket->lock); | |
1026 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 1027 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 1028 | pthread_mutex_unlock(socket->lock); |
07b86b52 | 1029 | /* Put back the saved consumer output into the session. */ |
6dc3064a DG |
1030 | ksess->consumer = saved_output; |
1031 | if (ret < 0) { | |
1032 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1033 | goto error_consumer; | |
1034 | } | |
1035 | ||
1036 | /* For each channel, ask the consumer to snapshot it. */ | |
1037 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
07b86b52 | 1038 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1039 | ret = consumer_snapshot_channel(socket, chan->fd, output, 0, |
5c786ded JD |
1040 | ksess->uid, ksess->gid, |
1041 | DEFAULT_KERNEL_TRACE_DIR, wait, | |
d07ceecd | 1042 | nb_packets_per_stream); |
07b86b52 | 1043 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
1044 | if (ret < 0) { |
1045 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
2a06df8d DG |
1046 | (void) kernel_consumer_destroy_metadata(socket, |
1047 | ksess->metadata); | |
6dc3064a DG |
1048 | goto error_consumer; |
1049 | } | |
1050 | } | |
1051 | ||
1052 | /* Snapshot metadata, */ | |
07b86b52 | 1053 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1054 | ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output, |
5c786ded | 1055 | 1, ksess->uid, ksess->gid, |
d07ceecd | 1056 | DEFAULT_KERNEL_TRACE_DIR, wait, 0); |
07b86b52 | 1057 | pthread_mutex_unlock(socket->lock); |
6dc3064a DG |
1058 | if (ret < 0) { |
1059 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1060 | goto error_consumer; | |
1061 | } | |
07b86b52 JD |
1062 | |
1063 | /* | |
1064 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1065 | * it's not monitored on the consumer side. | |
1066 | */ | |
1067 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1068 | } |
1069 | ||
fac41e72 DG |
1070 | ret = LTTNG_OK; |
1071 | ||
6dc3064a DG |
1072 | error_consumer: |
1073 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1074 | err = close(ksess->metadata_stream_fd); |
1075 | if (err < 0) { | |
6dc3064a DG |
1076 | PERROR("close snapshot kernel"); |
1077 | } | |
1078 | ||
1079 | error_open_stream: | |
1080 | trace_kernel_destroy_metadata(ksess->metadata); | |
1081 | error: | |
1082 | /* Restore metadata state.*/ | |
1083 | ksess->metadata = saved_metadata; | |
1084 | ksess->metadata_stream_fd = saved_metadata_fd; | |
1085 | ||
1086 | rcu_read_unlock(); | |
1087 | return ret; | |
1088 | } | |
834978fd DG |
1089 | |
1090 | /* | |
1091 | * Get the syscall mask array from the kernel tracer. | |
1092 | * | |
1093 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1094 | * be freed. | |
1095 | */ | |
1096 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1097 | { | |
1098 | assert(syscall_mask); | |
1099 | assert(nr_bits); | |
1100 | ||
1101 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1102 | } |