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 |
7b395890 | 19 | #include <fcntl.h> |
20fe2104 DG |
20 | #include <stdlib.h> |
21 | #include <stdio.h> | |
f34daff7 | 22 | #include <string.h> |
8c0faa1d | 23 | #include <unistd.h> |
77c7c900 | 24 | #include <inttypes.h> |
20fe2104 | 25 | |
990570ed | 26 | #include <common/common.h> |
db758600 | 27 | #include <common/kernel-ctl/kernel-ctl.h> |
c052142c | 28 | #include <common/kernel-ctl/kernel-ioctl.h> |
42224349 | 29 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 30 | |
2f77fc4b | 31 | #include "consumer.h" |
4771f025 | 32 | #include "kernel.h" |
6dc3064a | 33 | #include "kernel-consumer.h" |
096102bd | 34 | #include "kern-modules.h" |
834978fd | 35 | #include "utils.h" |
5c408ad8 | 36 | #include "rotate.h" |
20fe2104 | 37 | |
e1f3997a JD |
38 | /* |
39 | * Key used to reference a channel between the sessiond and the consumer. This | |
40 | * is only read and updated with the session_list lock held. | |
41 | */ | |
42 | static uint64_t next_kernel_channel_key; | |
43 | ||
d65106b1 | 44 | /* |
050349bb | 45 | * Add context on a kernel channel. |
df3c77c8 JG |
46 | * |
47 | * Assumes the ownership of ctx. | |
d65106b1 DG |
48 | */ |
49 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 50 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
51 | { |
52 | int ret; | |
53 | ||
0525e9ae DG |
54 | assert(chan); |
55 | assert(ctx); | |
56 | ||
d65106b1 | 57 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 58 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 59 | if (ret < 0) { |
32af2c95 | 60 | switch (-ret) { |
1ae5e83e JD |
61 | case ENOSYS: |
62 | /* Exists but not available for this kernel */ | |
63 | ret = LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE; | |
64 | goto error; | |
65 | case EEXIST: | |
b579acd9 DG |
66 | /* If EEXIST, we just ignore the error */ |
67 | ret = 0; | |
1ae5e83e JD |
68 | goto end; |
69 | default: | |
70 | PERROR("add context ioctl"); | |
71 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; | |
72 | goto error; | |
b579acd9 | 73 | } |
d65106b1 | 74 | } |
21ed98c1 | 75 | ret = 0; |
d65106b1 | 76 | |
1ae5e83e | 77 | end: |
645328ae | 78 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
ba985c3a | 79 | ctx->in_list = true; |
df3c77c8 | 80 | ctx = NULL; |
d65106b1 | 81 | error: |
df3c77c8 JG |
82 | if (ctx) { |
83 | trace_kernel_destroy_context(ctx); | |
84 | } | |
d65106b1 DG |
85 | return ret; |
86 | } | |
87 | ||
20fe2104 | 88 | /* |
050349bb DG |
89 | * Create a new kernel session, register it to the kernel tracer and add it to |
90 | * the session daemon session. | |
20fe2104 | 91 | */ |
8c0faa1d | 92 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
20fe2104 DG |
93 | { |
94 | int ret; | |
95 | struct ltt_kernel_session *lks; | |
96 | ||
0525e9ae DG |
97 | assert(session); |
98 | ||
54012638 | 99 | /* Allocate data structure */ |
dec56f6c | 100 | lks = trace_kernel_create_session(); |
20fe2104 | 101 | if (lks == NULL) { |
54012638 | 102 | ret = -1; |
20fe2104 DG |
103 | goto error; |
104 | } | |
105 | ||
54012638 | 106 | /* Kernel tracer session creation */ |
20fe2104 DG |
107 | ret = kernctl_create_session(tracer_fd); |
108 | if (ret < 0) { | |
df0f840b | 109 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
110 | goto error; |
111 | } | |
112 | ||
20fe2104 | 113 | lks->fd = ret; |
7b395890 DG |
114 | /* Prevent fd duplication after execlp() */ |
115 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
116 | if (ret < 0) { | |
df0f840b | 117 | PERROR("fcntl session fd"); |
7b395890 DG |
118 | } |
119 | ||
53632229 | 120 | lks->id = session->id; |
3bd1e081 | 121 | lks->consumer_fds_sent = 0; |
8c0faa1d | 122 | session->kernel_session = lks; |
8c0faa1d DG |
123 | |
124 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 DG |
125 | |
126 | return 0; | |
127 | ||
128 | error: | |
5f62c685 DG |
129 | if (lks) { |
130 | trace_kernel_destroy_session(lks); | |
131 | } | |
20fe2104 DG |
132 | return ret; |
133 | } | |
134 | ||
135 | /* | |
050349bb DG |
136 | * Create a kernel channel, register it to the kernel tracer and add it to the |
137 | * kernel session. | |
20fe2104 | 138 | */ |
050349bb | 139 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 140 | struct lttng_channel *chan) |
20fe2104 DG |
141 | { |
142 | int ret; | |
143 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 144 | |
0525e9ae DG |
145 | assert(session); |
146 | assert(chan); | |
0525e9ae | 147 | |
54012638 | 148 | /* Allocate kernel channel */ |
fdd9eb17 | 149 | lkc = trace_kernel_create_channel(chan); |
54012638 | 150 | if (lkc == NULL) { |
20fe2104 DG |
151 | goto error; |
152 | } | |
153 | ||
ecc48a90 | 154 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 155 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
156 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
157 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 158 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 159 | |
54012638 | 160 | /* Kernel tracer channel creation */ |
f3ed775e | 161 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 162 | if (ret < 0) { |
df0f840b | 163 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
164 | goto error; |
165 | } | |
166 | ||
54012638 | 167 | /* Setup the channel fd */ |
20fe2104 | 168 | lkc->fd = ret; |
7b395890 DG |
169 | /* Prevent fd duplication after execlp() */ |
170 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
171 | if (ret < 0) { | |
df0f840b | 172 | PERROR("fcntl session fd"); |
7b395890 DG |
173 | } |
174 | ||
54012638 | 175 | /* Add channel to session */ |
8c0faa1d DG |
176 | cds_list_add(&lkc->list, &session->channel_list.head); |
177 | session->channel_count++; | |
fb5f35b6 | 178 | lkc->session = session; |
e1f3997a | 179 | lkc->key = ++next_kernel_channel_key; |
20fe2104 | 180 | |
e1f3997a JD |
181 | DBG("Kernel channel %s created (fd: %d, key: %" PRIu64 ")", |
182 | lkc->channel->name, lkc->fd, lkc->key); | |
20fe2104 DG |
183 | |
184 | return 0; | |
185 | ||
186 | error: | |
5f62c685 DG |
187 | if (lkc) { |
188 | free(lkc->channel); | |
189 | free(lkc); | |
190 | } | |
54012638 | 191 | return -1; |
20fe2104 | 192 | } |
f34daff7 DG |
193 | |
194 | /* | |
050349bb DG |
195 | * Create a kernel event, enable it to the kernel tracer and add it to the |
196 | * channel event list of the kernel session. | |
49d21f93 | 197 | * We own filter_expression and filter. |
f34daff7 | 198 | */ |
050349bb | 199 | int kernel_create_event(struct lttng_event *ev, |
00a62084 MD |
200 | struct ltt_kernel_channel *channel, |
201 | char *filter_expression, | |
202 | struct lttng_filter_bytecode *filter) | |
f34daff7 DG |
203 | { |
204 | int ret; | |
205 | struct ltt_kernel_event *event; | |
f34daff7 | 206 | |
0525e9ae DG |
207 | assert(ev); |
208 | assert(channel); | |
209 | ||
a969e101 | 210 | /* We pass ownership of filter_expression and filter */ |
00a62084 MD |
211 | event = trace_kernel_create_event(ev, filter_expression, |
212 | filter); | |
54012638 | 213 | if (event == NULL) { |
d87bfb32 | 214 | ret = -1; |
f34daff7 DG |
215 | goto error; |
216 | } | |
217 | ||
f3ed775e DG |
218 | ret = kernctl_create_event(channel->fd, event->event); |
219 | if (ret < 0) { | |
32af2c95 | 220 | switch (-ret) { |
bd29c13d DG |
221 | case EEXIST: |
222 | break; | |
223 | case ENOSYS: | |
224 | WARN("Event type not implemented"); | |
225 | break; | |
8197a339 DG |
226 | case ENOENT: |
227 | WARN("Event %s not found!", ev->name); | |
228 | break; | |
bd29c13d | 229 | default: |
d87bfb32 DG |
230 | PERROR("create event ioctl"); |
231 | } | |
e953ef25 | 232 | goto free_event; |
8c0faa1d | 233 | } |
f34daff7 | 234 | |
d0ae4ea8 | 235 | event->type = ev->type; |
f3ed775e | 236 | event->fd = ret; |
7b395890 DG |
237 | /* Prevent fd duplication after execlp() */ |
238 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
239 | if (ret < 0) { | |
df0f840b | 240 | PERROR("fcntl session fd"); |
7b395890 DG |
241 | } |
242 | ||
00a62084 MD |
243 | if (filter) { |
244 | ret = kernctl_filter(event->fd, filter); | |
245 | if (ret) { | |
246 | goto filter_error; | |
247 | } | |
248 | } | |
249 | ||
250 | ret = kernctl_enable(event->fd); | |
251 | if (ret < 0) { | |
32af2c95 | 252 | switch (-ret) { |
00a62084 MD |
253 | case EEXIST: |
254 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
255 | break; | |
256 | default: | |
257 | PERROR("enable kernel event"); | |
258 | break; | |
259 | } | |
260 | goto enable_error; | |
261 | } | |
262 | ||
f3ed775e DG |
263 | /* Add event to event list */ |
264 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
265 | channel->event_count++; |
266 | ||
e953ef25 DG |
267 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
268 | ||
269 | return 0; | |
270 | ||
00a62084 MD |
271 | enable_error: |
272 | filter_error: | |
273 | { | |
274 | int closeret; | |
275 | ||
276 | closeret = close(event->fd); | |
277 | if (closeret) { | |
278 | PERROR("close event fd"); | |
279 | } | |
280 | } | |
e953ef25 DG |
281 | free_event: |
282 | free(event); | |
283 | error: | |
d87bfb32 | 284 | return ret; |
e953ef25 DG |
285 | } |
286 | ||
26cc6b4e | 287 | /* |
050349bb | 288 | * Disable a kernel channel. |
26cc6b4e DG |
289 | */ |
290 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
291 | { | |
292 | int ret; | |
293 | ||
0525e9ae DG |
294 | assert(chan); |
295 | ||
26cc6b4e DG |
296 | ret = kernctl_disable(chan->fd); |
297 | if (ret < 0) { | |
df0f840b | 298 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
299 | goto error; |
300 | } | |
301 | ||
302 | chan->enabled = 0; | |
e1f3997a JD |
303 | DBG("Kernel channel %s disabled (fd: %d, key: %" PRIu64 ")", |
304 | chan->channel->name, chan->fd, chan->key); | |
26cc6b4e DG |
305 | |
306 | return 0; | |
307 | ||
308 | error: | |
309 | return ret; | |
310 | } | |
311 | ||
d36b8583 | 312 | /* |
050349bb | 313 | * Enable a kernel channel. |
d36b8583 DG |
314 | */ |
315 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
316 | { | |
317 | int ret; | |
318 | ||
0525e9ae DG |
319 | assert(chan); |
320 | ||
d36b8583 | 321 | ret = kernctl_enable(chan->fd); |
32af2c95 | 322 | if (ret < 0 && ret != -EEXIST) { |
df0f840b | 323 | PERROR("Enable kernel chan"); |
d36b8583 DG |
324 | goto error; |
325 | } | |
326 | ||
327 | chan->enabled = 1; | |
e1f3997a JD |
328 | DBG("Kernel channel %s enabled (fd: %d, key: %" PRIu64 ")", |
329 | chan->channel->name, chan->fd, chan->key); | |
d36b8583 DG |
330 | |
331 | return 0; | |
332 | ||
333 | error: | |
334 | return ret; | |
335 | } | |
336 | ||
19e70852 | 337 | /* |
050349bb | 338 | * Enable a kernel event. |
19e70852 DG |
339 | */ |
340 | int kernel_enable_event(struct ltt_kernel_event *event) | |
341 | { | |
342 | int ret; | |
343 | ||
0525e9ae DG |
344 | assert(event); |
345 | ||
19e70852 | 346 | ret = kernctl_enable(event->fd); |
42224349 | 347 | if (ret < 0) { |
32af2c95 | 348 | switch (-ret) { |
42224349 | 349 | case EEXIST: |
f73fabfd | 350 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
351 | break; |
352 | default: | |
353 | PERROR("enable kernel event"); | |
354 | break; | |
355 | } | |
19e70852 DG |
356 | goto error; |
357 | } | |
358 | ||
359 | event->enabled = 1; | |
360 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
361 | ||
362 | return 0; | |
363 | ||
364 | error: | |
d36b8583 | 365 | return ret; |
19e70852 DG |
366 | } |
367 | ||
e953ef25 | 368 | /* |
050349bb | 369 | * Disable a kernel event. |
e953ef25 | 370 | */ |
19e70852 | 371 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
372 | { |
373 | int ret; | |
19e70852 | 374 | |
0525e9ae DG |
375 | assert(event); |
376 | ||
19e70852 | 377 | ret = kernctl_disable(event->fd); |
42224349 | 378 | if (ret < 0) { |
32af2c95 | 379 | switch (-ret) { |
42224349 | 380 | case EEXIST: |
f73fabfd | 381 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
382 | break; |
383 | default: | |
384 | PERROR("disable kernel event"); | |
385 | break; | |
386 | } | |
19e70852 | 387 | goto error; |
e953ef25 | 388 | } |
f3ed775e | 389 | |
19e70852 DG |
390 | event->enabled = 0; |
391 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
392 | ||
f34daff7 DG |
393 | return 0; |
394 | ||
395 | error: | |
d36b8583 | 396 | return ret; |
f34daff7 | 397 | } |
aaf26714 | 398 | |
a24248b3 MD |
399 | static |
400 | struct lttng_tracker_list *get_id_tracker_list(struct ltt_kernel_session *session, | |
401 | enum lttng_tracker_type tracker_type) | |
402 | { | |
403 | switch (tracker_type) { | |
404 | case LTTNG_TRACKER_PID: | |
405 | return session->tracker_list_pid; | |
406 | case LTTNG_TRACKER_VPID: | |
407 | return session->tracker_list_vpid; | |
408 | case LTTNG_TRACKER_UID: | |
409 | return session->tracker_list_uid; | |
410 | case LTTNG_TRACKER_VUID: | |
411 | return session->tracker_list_vuid; | |
412 | case LTTNG_TRACKER_GID: | |
413 | return session->tracker_list_gid; | |
414 | case LTTNG_TRACKER_VGID: | |
415 | return session->tracker_list_vgid; | |
416 | default: | |
417 | return NULL; | |
418 | } | |
419 | } | |
6e911cad | 420 | |
a24248b3 MD |
421 | int kernel_track_id(enum lttng_tracker_type tracker_type, |
422 | struct ltt_kernel_session *session, | |
423 | struct lttng_tracker_id *id) | |
ccf10263 | 424 | { |
a24248b3 MD |
425 | int ret, value; |
426 | struct lttng_tracker_list *tracker_list; | |
427 | ||
428 | ret = lttng_tracker_id_lookup_string(tracker_type, | |
429 | id, &value); | |
430 | if (ret != LTTNG_OK) { | |
431 | return ret; | |
432 | } | |
433 | ||
434 | /* Add to list. */ | |
435 | tracker_list = get_id_tracker_list(session, tracker_type); | |
436 | if (!tracker_list) { | |
437 | return LTTNG_ERR_INVALID; | |
438 | } | |
439 | ret = lttng_tracker_list_add(tracker_list, id); | |
440 | if (ret != LTTNG_OK) { | |
441 | return ret; | |
442 | } | |
7c493d31 | 443 | |
a24248b3 MD |
444 | switch (tracker_type) { |
445 | case LTTNG_TRACKER_PID: | |
446 | DBG("Kernel track PID %d for session id %" PRIu64 ".", | |
447 | value, session->id); | |
448 | ret = kernctl_track_pid(session->fd, value); | |
449 | if (!ret) { | |
450 | return LTTNG_OK; | |
451 | } | |
452 | break; | |
453 | case LTTNG_TRACKER_VPID: | |
454 | DBG("Kernel track VPID %d for session id %" PRIu64 ".", | |
455 | value, session->id); | |
456 | ret = kernctl_track_id(session->fd, LTTNG_TRACKER_VPID, value); | |
457 | if (!ret) { | |
458 | return LTTNG_OK; | |
459 | } | |
460 | break; | |
461 | case LTTNG_TRACKER_UID: | |
462 | DBG("Kernel track UID %d for session id %" PRIu64 ".", | |
463 | value, session->id); | |
464 | ret = kernctl_track_id(session->fd, LTTNG_TRACKER_UID, value); | |
465 | if (!ret) { | |
466 | return LTTNG_OK; | |
467 | } | |
468 | break; | |
469 | case LTTNG_TRACKER_GID: | |
470 | DBG("Kernel track GID %d for session id %" PRIu64 ".", | |
471 | value, session->id); | |
472 | ret = kernctl_track_id(session->fd, LTTNG_TRACKER_GID, value); | |
473 | if (!ret) { | |
474 | return LTTNG_OK; | |
475 | } | |
476 | break; | |
477 | case LTTNG_TRACKER_VUID: | |
478 | DBG("Kernel track VUID %d for session id %" PRIu64 ".", | |
479 | value, session->id); | |
480 | ret = kernctl_track_id(session->fd, LTTNG_TRACKER_VUID, value); | |
481 | if (!ret) { | |
482 | return LTTNG_OK; | |
483 | } | |
484 | break; | |
485 | case LTTNG_TRACKER_VGID: | |
486 | DBG("Kernel track VGID %d for session id %" PRIu64 ".", | |
487 | value, session->id); | |
488 | ret = kernctl_track_id(session->fd, LTTNG_TRACKER_VGID, value); | |
489 | if (!ret) { | |
490 | return LTTNG_OK; | |
491 | } | |
492 | break; | |
493 | default: | |
494 | return LTTNG_ERR_INVALID; | |
7c493d31 | 495 | } |
32af2c95 | 496 | switch (-ret) { |
7c493d31 MD |
497 | case EINVAL: |
498 | return LTTNG_ERR_INVALID; | |
499 | case ENOMEM: | |
500 | return LTTNG_ERR_NOMEM; | |
501 | case EEXIST: | |
a24248b3 | 502 | return LTTNG_ERR_ID_TRACKED; |
7c493d31 MD |
503 | default: |
504 | return LTTNG_ERR_UNK; | |
505 | } | |
ccf10263 MD |
506 | } |
507 | ||
a24248b3 MD |
508 | int kernel_untrack_id(enum lttng_tracker_type tracker_type, |
509 | struct ltt_kernel_session *session, | |
510 | struct lttng_tracker_id *id) | |
ccf10263 | 511 | { |
a24248b3 MD |
512 | int ret, value; |
513 | struct lttng_tracker_list *tracker_list; | |
514 | ||
515 | ret = lttng_tracker_id_lookup_string(tracker_type, | |
516 | id, &value); | |
517 | if (ret != LTTNG_OK) { | |
518 | return ret; | |
519 | } | |
7c493d31 | 520 | |
a24248b3 MD |
521 | /* Remove from list. */ |
522 | tracker_list = get_id_tracker_list(session, tracker_type); | |
523 | if (!tracker_list) { | |
524 | return LTTNG_ERR_INVALID; | |
525 | } | |
526 | ret = lttng_tracker_list_remove(tracker_list, id); | |
527 | if (ret != LTTNG_OK) { | |
528 | return ret; | |
7c493d31 | 529 | } |
a24248b3 MD |
530 | |
531 | switch (tracker_type) { | |
532 | case LTTNG_TRACKER_PID: | |
533 | DBG("Kernel untrack PID %d for session id %" PRIu64 ".", | |
534 | value, session->id); | |
535 | ret = kernctl_untrack_pid(session->fd, value); | |
536 | if (!ret) { | |
537 | return LTTNG_OK; | |
538 | } | |
539 | break; | |
540 | case LTTNG_TRACKER_VPID: | |
541 | DBG("Kernel untrack VPID %d for session id %" PRIu64 ".", | |
542 | value, session->id); | |
543 | ret = kernctl_untrack_id(session->fd, LTTNG_TRACKER_VPID, value); | |
544 | if (!ret) { | |
545 | return LTTNG_OK; | |
546 | } | |
547 | break; | |
548 | case LTTNG_TRACKER_UID: | |
549 | DBG("Kernel untrack UID %d for session id %" PRIu64 ".", | |
550 | value, session->id); | |
551 | ret = kernctl_untrack_id(session->fd, LTTNG_TRACKER_UID, value); | |
552 | if (!ret) { | |
553 | return LTTNG_OK; | |
554 | } | |
555 | break; | |
556 | case LTTNG_TRACKER_GID: | |
557 | DBG("Kernel untrack GID %d for session id %" PRIu64 ".", | |
558 | value, session->id); | |
559 | ret = kernctl_untrack_id(session->fd, LTTNG_TRACKER_GID, value); | |
560 | if (!ret) { | |
561 | return LTTNG_OK; | |
562 | } | |
563 | break; | |
564 | case LTTNG_TRACKER_VUID: | |
565 | DBG("Kernel untrack VUID %d for session id %" PRIu64 ".", | |
566 | value, session->id); | |
567 | ret = kernctl_untrack_id(session->fd, LTTNG_TRACKER_VUID, value); | |
568 | if (!ret) { | |
569 | return LTTNG_OK; | |
570 | } | |
571 | break; | |
572 | case LTTNG_TRACKER_VGID: | |
573 | DBG("Kernel untrack VGID %d for session id %" PRIu64 ".", | |
574 | value, session->id); | |
575 | ret = kernctl_untrack_id(session->fd, LTTNG_TRACKER_VGID, value); | |
576 | if (!ret) { | |
577 | return LTTNG_OK; | |
578 | } | |
579 | break; | |
580 | default: | |
581 | return LTTNG_ERR_INVALID; | |
582 | } | |
583 | ||
32af2c95 | 584 | switch (-ret) { |
7c493d31 MD |
585 | case EINVAL: |
586 | return LTTNG_ERR_INVALID; | |
587 | case ENOMEM: | |
588 | return LTTNG_ERR_NOMEM; | |
589 | case ENOENT: | |
a24248b3 | 590 | return LTTNG_ERR_ID_NOT_TRACKED; |
7c493d31 MD |
591 | default: |
592 | return LTTNG_ERR_UNK; | |
593 | } | |
ccf10263 MD |
594 | } |
595 | ||
a24248b3 MD |
596 | /* |
597 | * Called with session lock held. | |
598 | */ | |
599 | ssize_t kernel_list_tracker_ids(enum lttng_tracker_type tracker_type, | |
600 | struct ltt_kernel_session *session, | |
601 | struct lttng_tracker_id **_ids) | |
a5dfbb9d | 602 | { |
a24248b3 | 603 | struct lttng_tracker_list *tracker_list; |
a5dfbb9d | 604 | |
a24248b3 MD |
605 | tracker_list = get_id_tracker_list(session, tracker_type); |
606 | if (!tracker_list) { | |
607 | return -LTTNG_ERR_INVALID; | |
a5dfbb9d | 608 | } |
a24248b3 | 609 | return lttng_tracker_id_get_list(tracker_list, _ids); |
a5dfbb9d MD |
610 | } |
611 | ||
aaf26714 | 612 | /* |
050349bb DG |
613 | * Create kernel metadata, open from the kernel tracer and add it to the |
614 | * kernel session. | |
aaf26714 | 615 | */ |
a4b92340 | 616 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
617 | { |
618 | int ret; | |
74024a21 | 619 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 620 | |
0525e9ae DG |
621 | assert(session); |
622 | ||
54012638 | 623 | /* Allocate kernel metadata */ |
a4b92340 | 624 | lkm = trace_kernel_create_metadata(); |
54012638 | 625 | if (lkm == NULL) { |
aaf26714 DG |
626 | goto error; |
627 | } | |
628 | ||
54012638 | 629 | /* Kernel tracer metadata creation */ |
f3ed775e | 630 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 631 | if (ret < 0) { |
74024a21 | 632 | goto error_open; |
aaf26714 DG |
633 | } |
634 | ||
8c0faa1d | 635 | lkm->fd = ret; |
d40f0359 | 636 | lkm->key = ++next_kernel_channel_key; |
7b395890 DG |
637 | /* Prevent fd duplication after execlp() */ |
638 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
639 | if (ret < 0) { | |
df0f840b | 640 | PERROR("fcntl session fd"); |
7b395890 DG |
641 | } |
642 | ||
aaf26714 | 643 | session->metadata = lkm; |
8c0faa1d | 644 | |
00e2e675 | 645 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
646 | |
647 | return 0; | |
648 | ||
74024a21 DG |
649 | error_open: |
650 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 651 | error: |
54012638 | 652 | return -1; |
8c0faa1d DG |
653 | } |
654 | ||
655 | /* | |
050349bb | 656 | * Start tracing session. |
8c0faa1d DG |
657 | */ |
658 | int kernel_start_session(struct ltt_kernel_session *session) | |
659 | { | |
660 | int ret; | |
661 | ||
0525e9ae DG |
662 | assert(session); |
663 | ||
8c0faa1d DG |
664 | ret = kernctl_start_session(session->fd); |
665 | if (ret < 0) { | |
df0f840b | 666 | PERROR("ioctl start session"); |
8c0faa1d DG |
667 | goto error; |
668 | } | |
669 | ||
670 | DBG("Kernel session started"); | |
671 | ||
672 | return 0; | |
673 | ||
674 | error: | |
675 | return ret; | |
676 | } | |
677 | ||
f3ed775e | 678 | /* |
050349bb | 679 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e DG |
680 | */ |
681 | void kernel_wait_quiescent(int fd) | |
682 | { | |
683 | int ret; | |
684 | ||
685 | DBG("Kernel quiescent wait on %d", fd); | |
686 | ||
687 | ret = kernctl_wait_quiescent(fd); | |
688 | if (ret < 0) { | |
df0f840b | 689 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
690 | ERR("Kernel quiescent wait failed"); |
691 | } | |
692 | } | |
693 | ||
694 | /* | |
f3ed775e DG |
695 | * Force flush buffer of metadata. |
696 | */ | |
697 | int kernel_metadata_flush_buffer(int fd) | |
698 | { | |
699 | int ret; | |
700 | ||
169d2cb7 DG |
701 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
702 | ||
f3ed775e DG |
703 | ret = kernctl_buffer_flush(fd); |
704 | if (ret < 0) { | |
00e2e675 | 705 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
706 | } |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
711 | /* | |
050349bb | 712 | * Force flush buffer for channel. |
f3ed775e DG |
713 | */ |
714 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
715 | { | |
716 | int ret; | |
717 | struct ltt_kernel_stream *stream; | |
718 | ||
0525e9ae DG |
719 | assert(channel); |
720 | ||
f3ed775e DG |
721 | DBG("Flush buffer for channel %s", channel->channel->name); |
722 | ||
723 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
724 | DBG("Flushing channel stream %d", stream->fd); | |
725 | ret = kernctl_buffer_flush(stream->fd); | |
726 | if (ret < 0) { | |
df0f840b | 727 | PERROR("ioctl"); |
f3ed775e DG |
728 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
729 | stream->fd, ret); | |
730 | } | |
731 | } | |
732 | ||
733 | return 0; | |
734 | } | |
735 | ||
8c0faa1d | 736 | /* |
050349bb | 737 | * Stop tracing session. |
8c0faa1d DG |
738 | */ |
739 | int kernel_stop_session(struct ltt_kernel_session *session) | |
740 | { | |
741 | int ret; | |
742 | ||
0525e9ae DG |
743 | assert(session); |
744 | ||
8c0faa1d DG |
745 | ret = kernctl_stop_session(session->fd); |
746 | if (ret < 0) { | |
747 | goto error; | |
748 | } | |
749 | ||
750 | DBG("Kernel session stopped"); | |
751 | ||
752 | return 0; | |
753 | ||
754 | error: | |
755 | return ret; | |
756 | } | |
757 | ||
758 | /* | |
050349bb DG |
759 | * Open stream of channel, register it to the kernel tracer and add it |
760 | * to the stream list of the channel. | |
8c0faa1d | 761 | * |
1cfb4b98 MD |
762 | * Note: given that the streams may appear in random order wrt CPU |
763 | * number (e.g. cpu hotplug), the index value of the stream number in | |
764 | * the stream name is not necessarily linked to the CPU number. | |
765 | * | |
050349bb | 766 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 767 | */ |
f3ed775e | 768 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 769 | { |
1cfb4b98 | 770 | int ret; |
8c0faa1d DG |
771 | struct ltt_kernel_stream *lks; |
772 | ||
0525e9ae DG |
773 | assert(channel); |
774 | ||
5a47c6a2 | 775 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
1cfb4b98 MD |
776 | lks = trace_kernel_create_stream(channel->channel->name, |
777 | channel->stream_count); | |
8c0faa1d | 778 | if (lks == NULL) { |
799e2c4f MD |
779 | ret = close(ret); |
780 | if (ret) { | |
781 | PERROR("close"); | |
782 | } | |
8c0faa1d DG |
783 | goto error; |
784 | } | |
785 | ||
786 | lks->fd = ret; | |
7b395890 DG |
787 | /* Prevent fd duplication after execlp() */ |
788 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
789 | if (ret < 0) { | |
df0f840b | 790 | PERROR("fcntl session fd"); |
7b395890 DG |
791 | } |
792 | ||
1624d5b7 JD |
793 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
794 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
795 | ||
1cfb4b98 | 796 | /* Add stream to channel stream list */ |
8c0faa1d DG |
797 | cds_list_add(&lks->list, &channel->stream_list.head); |
798 | channel->stream_count++; | |
8c0faa1d | 799 | |
00e2e675 DG |
800 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, |
801 | lks->state); | |
54012638 | 802 | } |
8c0faa1d DG |
803 | |
804 | return channel->stream_count; | |
805 | ||
806 | error: | |
54012638 | 807 | return -1; |
8c0faa1d DG |
808 | } |
809 | ||
810 | /* | |
050349bb | 811 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 812 | */ |
f3ed775e | 813 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
814 | { |
815 | int ret; | |
816 | ||
0525e9ae DG |
817 | assert(session); |
818 | ||
8c0faa1d DG |
819 | ret = kernctl_create_stream(session->metadata->fd); |
820 | if (ret < 0) { | |
df0f840b | 821 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
822 | goto error; |
823 | } | |
824 | ||
825 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
826 | session->metadata_stream_fd = ret; | |
7b395890 DG |
827 | /* Prevent fd duplication after execlp() */ |
828 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
829 | if (ret < 0) { | |
df0f840b | 830 | PERROR("fcntl session fd"); |
7b395890 | 831 | } |
aaf26714 DG |
832 | |
833 | return 0; | |
834 | ||
835 | error: | |
54012638 | 836 | return -1; |
aaf26714 | 837 | } |
2ef84c95 DG |
838 | |
839 | /* | |
9f19cc17 | 840 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 841 | */ |
9f19cc17 | 842 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
2ef84c95 | 843 | { |
53efb85a | 844 | int fd, ret; |
9f19cc17 DG |
845 | char *event; |
846 | size_t nbmem, count = 0; | |
2ef84c95 | 847 | FILE *fp; |
9f19cc17 | 848 | struct lttng_event *elist; |
2ef84c95 | 849 | |
0525e9ae DG |
850 | assert(events); |
851 | ||
2ef84c95 DG |
852 | fd = kernctl_tracepoint_list(tracer_fd); |
853 | if (fd < 0) { | |
df0f840b | 854 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
855 | goto error; |
856 | } | |
857 | ||
858 | fp = fdopen(fd, "r"); | |
859 | if (fp == NULL) { | |
df0f840b | 860 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 861 | goto error_fp; |
2ef84c95 DG |
862 | } |
863 | ||
864 | /* | |
865 | * Init memory size counter | |
866 | * See kernel-ctl.h for explanation of this value | |
867 | */ | |
6725fe19 | 868 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 869 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
870 | if (elist == NULL) { |
871 | PERROR("alloc list events"); | |
872 | count = -ENOMEM; | |
873 | goto end; | |
874 | } | |
2ef84c95 | 875 | |
53efb85a | 876 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 877 | if (count >= nbmem) { |
3b870559 | 878 | struct lttng_event *new_elist; |
53efb85a | 879 | size_t new_nbmem; |
3b870559 | 880 | |
53efb85a MD |
881 | new_nbmem = nbmem << 1; |
882 | DBG("Reallocating event list from %zu to %zu bytes", | |
883 | nbmem, new_nbmem); | |
884 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 885 | if (new_elist == NULL) { |
df0f840b | 886 | PERROR("realloc list events"); |
3b870559 MD |
887 | free(event); |
888 | free(elist); | |
61b73b12 MD |
889 | count = -ENOMEM; |
890 | goto end; | |
2ef84c95 | 891 | } |
53efb85a MD |
892 | /* Zero the new memory */ |
893 | memset(new_elist + nbmem, 0, | |
894 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
895 | nbmem = new_nbmem; | |
3b870559 | 896 | elist = new_elist; |
2ef84c95 | 897 | } |
99497cd0 MD |
898 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
899 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 900 | elist[count].enabled = -1; |
9f19cc17 | 901 | count++; |
3b870559 | 902 | free(event); |
2ef84c95 DG |
903 | } |
904 | ||
9f19cc17 | 905 | *events = elist; |
ced2f820 | 906 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 907 | end: |
799e2c4f MD |
908 | ret = fclose(fp); /* closes both fp and fd */ |
909 | if (ret) { | |
910 | PERROR("fclose"); | |
911 | } | |
9f19cc17 | 912 | return count; |
2ef84c95 | 913 | |
61b73b12 | 914 | error_fp: |
799e2c4f MD |
915 | ret = close(fd); |
916 | if (ret) { | |
917 | PERROR("close"); | |
918 | } | |
2ef84c95 DG |
919 | error: |
920 | return -1; | |
921 | } | |
096102bd DG |
922 | |
923 | /* | |
924 | * Get kernel version and validate it. | |
925 | */ | |
88076e89 JD |
926 | int kernel_validate_version(int tracer_fd, |
927 | struct lttng_kernel_tracer_version *version, | |
928 | struct lttng_kernel_tracer_abi_version *abi_version) | |
096102bd DG |
929 | { |
930 | int ret; | |
096102bd | 931 | |
88076e89 | 932 | ret = kernctl_tracer_version(tracer_fd, version); |
096102bd | 933 | if (ret < 0) { |
521dd134 | 934 | ERR("Failed to retrieve the lttng-modules version"); |
096102bd DG |
935 | goto error; |
936 | } | |
937 | ||
938 | /* Validate version */ | |
88076e89 | 939 | if (version->major != VERSION_MAJOR) { |
c052142c | 940 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", |
88076e89 | 941 | version->major, VERSION_MAJOR); |
096102bd | 942 | goto error_version; |
096102bd | 943 | } |
88076e89 | 944 | ret = kernctl_tracer_abi_version(tracer_fd, abi_version); |
c052142c | 945 | if (ret < 0) { |
521dd134 | 946 | ERR("Failed to retrieve lttng-modules ABI version"); |
c052142c MD |
947 | goto error; |
948 | } | |
88076e89 | 949 | if (abi_version->major != LTTNG_MODULES_ABI_MAJOR_VERSION) { |
521dd134 | 950 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
88076e89 | 951 | abi_version->major, abi_version->minor, |
c052142c MD |
952 | LTTNG_MODULES_ABI_MAJOR_VERSION); |
953 | goto error; | |
954 | } | |
955 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
88076e89 JD |
956 | version->major, version->minor, |
957 | abi_version->major, abi_version->minor); | |
096102bd DG |
958 | return 0; |
959 | ||
960 | error_version: | |
096102bd DG |
961 | ret = -1; |
962 | ||
963 | error: | |
521dd134 | 964 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
096102bd DG |
965 | return ret; |
966 | } | |
335a95b7 MD |
967 | |
968 | /* | |
969 | * Kernel work-arounds called at the start of sessiond main(). | |
970 | */ | |
971 | int init_kernel_workarounds(void) | |
972 | { | |
8936c33a | 973 | int ret; |
335a95b7 MD |
974 | FILE *fp; |
975 | ||
976 | /* | |
977 | * boot_id needs to be read once before being used concurrently | |
978 | * to deal with a Linux kernel race. A fix is proposed for | |
979 | * upstream, but the work-around is needed for older kernels. | |
980 | */ | |
981 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
982 | if (!fp) { | |
983 | goto end_boot_id; | |
984 | } | |
985 | while (!feof(fp)) { | |
986 | char buf[37] = ""; | |
987 | ||
8936c33a DG |
988 | ret = fread(buf, 1, sizeof(buf), fp); |
989 | if (ret < 0) { | |
990 | /* Ignore error, we don't really care */ | |
991 | } | |
335a95b7 | 992 | } |
799e2c4f MD |
993 | ret = fclose(fp); |
994 | if (ret) { | |
995 | PERROR("fclose"); | |
996 | } | |
335a95b7 | 997 | end_boot_id: |
335a95b7 MD |
998 | return 0; |
999 | } | |
2f77fc4b DG |
1000 | |
1001 | /* | |
1002 | * Complete teardown of a kernel session. | |
1003 | */ | |
1004 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
1005 | { | |
1006 | if (ksess == NULL) { | |
1007 | DBG3("No kernel session when tearing down session"); | |
1008 | return; | |
1009 | } | |
1010 | ||
1011 | DBG("Tearing down kernel session"); | |
1012 | ||
07b86b52 | 1013 | /* |
15dc512a DG |
1014 | * Destroy channels on the consumer if at least one FD has been sent and we |
1015 | * are in no output mode because the streams are in *no* monitor mode so we | |
1016 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 1017 | */ |
15dc512a | 1018 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
1019 | int ret; |
1020 | struct consumer_socket *socket; | |
1021 | struct lttng_ht_iter iter; | |
1022 | ||
1023 | /* For each consumer socket. */ | |
d069d577 | 1024 | rcu_read_lock(); |
07b86b52 JD |
1025 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
1026 | socket, node.node) { | |
1027 | struct ltt_kernel_channel *chan; | |
1028 | ||
1029 | /* For each channel, ask the consumer to destroy it. */ | |
1030 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
1031 | ret = kernel_consumer_destroy_channel(socket, chan); | |
1032 | if (ret < 0) { | |
1033 | /* Consumer is probably dead. Use next socket. */ | |
1034 | continue; | |
1035 | } | |
1036 | } | |
1037 | } | |
d069d577 | 1038 | rcu_read_unlock(); |
07b86b52 JD |
1039 | } |
1040 | ||
2f77fc4b DG |
1041 | /* Close any relayd session */ |
1042 | consumer_output_send_destroy_relayd(ksess->consumer); | |
1043 | ||
1044 | trace_kernel_destroy_session(ksess); | |
1045 | } | |
fb5f35b6 DG |
1046 | |
1047 | /* | |
1048 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
1049 | */ | |
1050 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
1051 | { | |
1052 | struct ltt_kernel_session *ksess = NULL; | |
1053 | ||
1054 | assert(kchan); | |
1055 | assert(kchan->channel); | |
1056 | ||
1057 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
1058 | ||
1059 | /* Update channel count of associated session. */ | |
1060 | if (kchan->session) { | |
1061 | /* Keep pointer reference so we can update it after the destroy. */ | |
1062 | ksess = kchan->session; | |
1063 | } | |
1064 | ||
1065 | trace_kernel_destroy_channel(kchan); | |
1066 | ||
1067 | /* | |
1068 | * At this point the kernel channel is not visible anymore. This is safe | |
1069 | * since in order to work on a visible kernel session, the tracing session | |
1070 | * lock (ltt_session.lock) MUST be acquired. | |
1071 | */ | |
1072 | if (ksess) { | |
1073 | ksess->channel_count--; | |
1074 | } | |
1075 | } | |
6dc3064a DG |
1076 | |
1077 | /* | |
1078 | * Take a snapshot for a given kernel session. | |
1079 | * | |
2a06df8d | 1080 | * Return 0 on success or else return a LTTNG_ERR code. |
6dc3064a DG |
1081 | */ |
1082 | int kernel_snapshot_record(struct ltt_kernel_session *ksess, | |
d07ceecd MD |
1083 | struct snapshot_output *output, int wait, |
1084 | uint64_t nb_packets_per_stream) | |
6dc3064a | 1085 | { |
2a06df8d | 1086 | int err, ret, saved_metadata_fd; |
6dc3064a DG |
1087 | struct consumer_socket *socket; |
1088 | struct lttng_ht_iter iter; | |
1089 | struct ltt_kernel_metadata *saved_metadata; | |
e098433c JG |
1090 | struct ltt_session *session; |
1091 | uint64_t trace_archive_id; | |
6dc3064a DG |
1092 | |
1093 | assert(ksess); | |
1094 | assert(ksess->consumer); | |
1095 | assert(output); | |
1096 | ||
1097 | DBG("Kernel snapshot record started"); | |
1098 | ||
e098433c JG |
1099 | session = session_find_by_id(ksess->id); |
1100 | assert(session); | |
1101 | assert(pthread_mutex_trylock(&session->lock)); | |
1102 | assert(session_trylock_list()); | |
1103 | trace_archive_id = session->current_archive_id; | |
1104 | ||
6dc3064a DG |
1105 | /* Save current metadata since the following calls will change it. */ |
1106 | saved_metadata = ksess->metadata; | |
1107 | saved_metadata_fd = ksess->metadata_stream_fd; | |
1108 | ||
1109 | rcu_read_lock(); | |
1110 | ||
1111 | ret = kernel_open_metadata(ksess); | |
1112 | if (ret < 0) { | |
1113 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1114 | goto error; | |
1115 | } | |
1116 | ||
1117 | ret = kernel_open_metadata_stream(ksess); | |
1118 | if (ret < 0) { | |
1119 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1120 | goto error_open_stream; | |
1121 | } | |
1122 | ||
1123 | /* Send metadata to consumer and snapshot everything. */ | |
1124 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1125 | socket, node.node) { | |
1126 | struct consumer_output *saved_output; | |
1127 | struct ltt_kernel_channel *chan; | |
6dc3064a DG |
1128 | |
1129 | /* | |
1130 | * Temporarly switch consumer output for our snapshot output. As long | |
1131 | * as the session lock is taken, this is safe. | |
1132 | */ | |
1133 | saved_output = ksess->consumer; | |
1134 | ksess->consumer = output->consumer; | |
1135 | ||
1136 | pthread_mutex_lock(socket->lock); | |
1137 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 1138 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 1139 | pthread_mutex_unlock(socket->lock); |
07b86b52 | 1140 | /* Put back the saved consumer output into the session. */ |
6dc3064a DG |
1141 | ksess->consumer = saved_output; |
1142 | if (ret < 0) { | |
1143 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1144 | goto error_consumer; | |
1145 | } | |
1146 | ||
1147 | /* For each channel, ask the consumer to snapshot it. */ | |
1148 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
0a28e553 | 1149 | ret = consumer_snapshot_channel(socket, chan->key, output, 0, |
5c786ded JD |
1150 | ksess->uid, ksess->gid, |
1151 | DEFAULT_KERNEL_TRACE_DIR, wait, | |
e098433c JG |
1152 | nb_packets_per_stream, |
1153 | trace_archive_id); | |
6dc3064a DG |
1154 | if (ret < 0) { |
1155 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
2a06df8d DG |
1156 | (void) kernel_consumer_destroy_metadata(socket, |
1157 | ksess->metadata); | |
6dc3064a DG |
1158 | goto error_consumer; |
1159 | } | |
1160 | } | |
1161 | ||
1162 | /* Snapshot metadata, */ | |
d40f0359 | 1163 | ret = consumer_snapshot_channel(socket, ksess->metadata->key, output, |
5c786ded | 1164 | 1, ksess->uid, ksess->gid, |
e098433c JG |
1165 | DEFAULT_KERNEL_TRACE_DIR, wait, 0, |
1166 | trace_archive_id); | |
6dc3064a DG |
1167 | if (ret < 0) { |
1168 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1169 | goto error_consumer; | |
1170 | } | |
07b86b52 JD |
1171 | |
1172 | /* | |
1173 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1174 | * it's not monitored on the consumer side. | |
1175 | */ | |
1176 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1177 | } |
1178 | ||
fac41e72 DG |
1179 | ret = LTTNG_OK; |
1180 | ||
6dc3064a DG |
1181 | error_consumer: |
1182 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1183 | err = close(ksess->metadata_stream_fd); |
1184 | if (err < 0) { | |
6dc3064a DG |
1185 | PERROR("close snapshot kernel"); |
1186 | } | |
1187 | ||
1188 | error_open_stream: | |
1189 | trace_kernel_destroy_metadata(ksess->metadata); | |
1190 | error: | |
1191 | /* Restore metadata state.*/ | |
1192 | ksess->metadata = saved_metadata; | |
1193 | ksess->metadata_stream_fd = saved_metadata_fd; | |
1194 | ||
1195 | rcu_read_unlock(); | |
1196 | return ret; | |
1197 | } | |
834978fd DG |
1198 | |
1199 | /* | |
1200 | * Get the syscall mask array from the kernel tracer. | |
1201 | * | |
1202 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1203 | * be freed. | |
1204 | */ | |
1205 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1206 | { | |
1207 | assert(syscall_mask); | |
1208 | assert(nr_bits); | |
1209 | ||
1210 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1211 | } | |
6e21424e JR |
1212 | |
1213 | /* | |
1214 | * Check for the support of the RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS via abi | |
1215 | * version number. | |
1216 | * | |
1217 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1218 | * of errors. | |
1219 | */ | |
1220 | int kernel_supports_ring_buffer_snapshot_sample_positions(int tracer_fd) | |
1221 | { | |
1222 | int ret = 0; // Not supported by default | |
1223 | struct lttng_kernel_tracer_abi_version abi; | |
1224 | ||
1225 | ret = kernctl_tracer_abi_version(tracer_fd, &abi); | |
1226 | if (ret < 0) { | |
1227 | ERR("Failed to retrieve lttng-modules ABI version"); | |
1228 | goto error; | |
1229 | } | |
1230 | ||
1231 | /* | |
1232 | * RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS was introduced in 2.3 | |
1233 | */ | |
1234 | if (abi.major >= 2 && abi.minor >= 3) { | |
1235 | /* Supported */ | |
1236 | ret = 1; | |
1237 | } else { | |
1238 | /* Not supported */ | |
1239 | ret = 0; | |
1240 | } | |
1241 | error: | |
1242 | return ret; | |
1243 | } | |
5c408ad8 JD |
1244 | |
1245 | /* | |
1246 | * Rotate a kernel session. | |
1247 | * | |
1248 | * Return 0 on success or else return a LTTNG_ERR code. | |
1249 | */ | |
1250 | int kernel_rotate_session(struct ltt_session *session) | |
1251 | { | |
1252 | int ret; | |
1253 | struct consumer_socket *socket; | |
1254 | struct lttng_ht_iter iter; | |
1255 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1256 | ||
1257 | assert(ksess); | |
1258 | assert(ksess->consumer); | |
1259 | ||
1260 | DBG("Rotate kernel session %s started (session %" PRIu64 ")", | |
1261 | session->name, session->id); | |
1262 | ||
1263 | rcu_read_lock(); | |
1264 | ||
1265 | /* | |
1266 | * Note that this loop will end after one iteration given that there is | |
1267 | * only one kernel consumer. | |
1268 | */ | |
1269 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1270 | socket, node.node) { | |
1271 | struct ltt_kernel_channel *chan; | |
1272 | ||
1273 | /* | |
1274 | * Account the metadata channel first to make sure the | |
1275 | * number of channels waiting for a rotation cannot | |
1276 | * reach 0 before we complete the iteration over all | |
1277 | * the channels. | |
1278 | */ | |
22a1b931 | 1279 | ret = rotate_add_channel_pending(ksess->metadata->key, |
5c408ad8 JD |
1280 | LTTNG_DOMAIN_KERNEL, session); |
1281 | if (ret < 0) { | |
1282 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1283 | goto error; | |
1284 | } | |
1285 | ||
1286 | /* For each channel, ask the consumer to rotate it. */ | |
1287 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
1288 | ret = rotate_add_channel_pending(chan->key, | |
1289 | LTTNG_DOMAIN_KERNEL, session); | |
1290 | if (ret < 0) { | |
1291 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1292 | goto error; | |
1293 | } | |
1294 | ||
1295 | DBG("Rotate channel %" PRIu64 ", session %s", chan->key, session->name); | |
1296 | ret = consumer_rotate_channel(socket, chan->key, | |
1297 | ksess->uid, ksess->gid, ksess->consumer, | |
1298 | ksess->consumer->subdir, | |
1299 | /* is_metadata_channel */ false, | |
ad9f5c17 | 1300 | session->current_archive_id, |
5c408ad8 JD |
1301 | &session->rotate_pending_relay); |
1302 | if (ret < 0) { | |
1303 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1304 | goto error; | |
1305 | } | |
1306 | } | |
1307 | ||
1308 | /* | |
1309 | * Rotate the metadata channel. | |
1310 | */ | |
22a1b931 | 1311 | ret = consumer_rotate_channel(socket, ksess->metadata->key, |
5c408ad8 JD |
1312 | ksess->uid, ksess->gid, ksess->consumer, |
1313 | ksess->consumer->subdir, | |
1314 | /* is_metadata_channel */ true, | |
ad9f5c17 | 1315 | session->current_archive_id, |
5c408ad8 JD |
1316 | &session->rotate_pending_relay); |
1317 | if (ret < 0) { | |
1318 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1319 | goto error; | |
1320 | } | |
1321 | } | |
1322 | ||
1323 | ret = LTTNG_OK; | |
1324 | ||
1325 | error: | |
1326 | rcu_read_unlock(); | |
1327 | return ret; | |
1328 | } |