Implement $PATH binary searching function for userspace-probe
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.c
CommitLineData
54012638
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.
54012638
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.
54012638
DG
16 */
17
6c1c0768 18#define _LGPL_SOURCE
54012638
DG
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
c363b55d 22#include <unistd.h>
54012638 23
990570ed
DG
24#include <common/common.h>
25#include <common/defaults.h>
1e307fab 26
00e2e675 27#include "consumer.h"
62499ad6 28#include "trace-kernel.h"
e9404c27
JG
29#include "lttng-sessiond.h"
30#include "notification-thread-commands.h"
54012638 31
19e70852 32/*
050349bb 33 * Find the channel name for the given kernel session.
19e70852 34 */
62499ad6 35struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
19e70852
DG
36 char *name, struct ltt_kernel_session *session)
37{
38 struct ltt_kernel_channel *chan;
39
0525e9ae
DG
40 assert(session);
41 assert(name);
19e70852 42
85076754
MD
43 /*
44 * If we receive an empty string for channel name, it means the
45 * default channel name is requested.
46 */
47 if (name[0] == '\0')
48 name = DEFAULT_CHANNEL_NAME;
49
54d01ffb
DG
50 DBG("Trying to find channel %s", name);
51
19e70852
DG
52 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
53 if (strcmp(name, chan->channel->name) == 0) {
54 DBG("Found channel by name %s", name);
55 return chan;
56 }
57 }
58
19e70852
DG
59 return NULL;
60}
61
00a62084
MD
62/*
63 * Find the event for the given channel.
64 */
65struct ltt_kernel_event *trace_kernel_find_event(
66 char *name, struct ltt_kernel_channel *channel,
67 enum lttng_event_type type,
68 struct lttng_filter_bytecode *filter)
69{
70 struct ltt_kernel_event *ev;
71 int found = 0;
72
73 assert(name);
74 assert(channel);
75
76 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
77 if (type != LTTNG_EVENT_ALL && ev->type != type) {
78 continue;
79 }
80 if (strcmp(name, ev->event->name)) {
81 continue;
82 }
83 if ((ev->filter && !filter) || (!ev->filter && filter)) {
84 continue;
85 }
86 if (ev->filter && filter) {
87 if (ev->filter->len != filter->len ||
88 memcmp(ev->filter->data, filter->data,
89 filter->len) != 0) {
90 continue;
91 }
92 }
93 found = 1;
94 break;
95 }
96 if (found) {
97 DBG("Found event %s for channel %s", name,
98 channel->channel->name);
99 return ev;
100 } else {
101 return NULL;
102 }
103}
104
19e70852 105/*
050349bb 106 * Find the event name for the given channel.
19e70852 107 */
62499ad6 108struct ltt_kernel_event *trace_kernel_get_event_by_name(
d0ae4ea8
MD
109 char *name, struct ltt_kernel_channel *channel,
110 enum lttng_event_type type)
19e70852
DG
111{
112 struct ltt_kernel_event *ev;
00a62084 113 int found = 0;
19e70852 114
0525e9ae
DG
115 assert(name);
116 assert(channel);
19e70852
DG
117
118 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
00a62084 119 if (type != LTTNG_EVENT_ALL && ev->type != type) {
d0ae4ea8 120 continue;
19e70852 121 }
00a62084
MD
122 if (strcmp(name, ev->event->name)) {
123 continue;
124 }
125 found = 1;
126 break;
127 }
128 if (found) {
129 DBG("Found event %s for channel %s", name,
130 channel->channel->name);
131 return ev;
132 } else {
133 return NULL;
19e70852 134 }
19e70852
DG
135}
136
54012638 137/*
050349bb 138 * Allocate and initialize a kernel session data structure.
54012638 139 *
050349bb 140 * Return pointer to structure or NULL.
54012638 141 */
dec56f6c 142struct ltt_kernel_session *trace_kernel_create_session(void)
54012638 143{
a4b92340 144 struct ltt_kernel_session *lks = NULL;
54012638
DG
145
146 /* Allocate a new ltt kernel session */
ba7f0ae5 147 lks = zmalloc(sizeof(struct ltt_kernel_session));
54012638 148 if (lks == NULL) {
df0f840b 149 PERROR("create kernel session zmalloc");
a4b92340 150 goto alloc_error;
54012638
DG
151 }
152
153 /* Init data structure */
03550b58
MD
154 lks->fd = -1;
155 lks->metadata_stream_fd = -1;
54012638
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156 lks->channel_count = 0;
157 lks->stream_count_global = 0;
158 lks->metadata = NULL;
159 CDS_INIT_LIST_HEAD(&lks->channel_list.head);
160
00e2e675
DG
161 lks->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
162 if (lks->consumer == NULL) {
163 goto error;
164 }
165
54012638
DG
166 return lks;
167
168error:
a4b92340
DG
169 free(lks);
170
171alloc_error:
54012638
DG
172 return NULL;
173}
174
175/*
050349bb 176 * Allocate and initialize a kernel channel data structure.
54012638 177 *
050349bb 178 * Return pointer to structure or NULL.
54012638 179 */
00e2e675 180struct ltt_kernel_channel *trace_kernel_create_channel(
fdd9eb17 181 struct lttng_channel *chan)
54012638 182{
54012638 183 struct ltt_kernel_channel *lkc;
61a5b6b1 184 struct lttng_channel_extended *extended = NULL;
54012638 185
0525e9ae
DG
186 assert(chan);
187
ba7f0ae5 188 lkc = zmalloc(sizeof(struct ltt_kernel_channel));
f3ed775e 189 if (lkc == NULL) {
df0f840b 190 PERROR("ltt_kernel_channel zmalloc");
54012638
DG
191 goto error;
192 }
193
ba7f0ae5 194 lkc->channel = zmalloc(sizeof(struct lttng_channel));
f3ed775e 195 if (lkc->channel == NULL) {
df0f840b 196 PERROR("lttng_channel zmalloc");
e9404c27
JG
197 goto error;
198 }
199
200 extended = zmalloc(sizeof(struct lttng_channel_extended));
201 if (!extended) {
202 PERROR("lttng_channel_channel zmalloc");
f3ed775e
DG
203 goto error;
204 }
205 memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
e9404c27
JG
206 memcpy(extended, chan->attr.extended.ptr, sizeof(struct lttng_channel_extended));
207 lkc->channel->attr.extended.ptr = extended;
208 extended = NULL;
54012638 209
85076754
MD
210 /*
211 * If we receive an empty string for channel name, it means the
212 * default channel name is requested.
213 */
214 if (chan->name[0] == '\0') {
215 strncpy(lkc->channel->name, DEFAULT_CHANNEL_NAME,
216 sizeof(lkc->channel->name));
217 }
bd722d76 218 lkc->channel->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
85076754 219
03550b58 220 lkc->fd = -1;
54012638 221 lkc->stream_count = 0;
cbbbb275 222 lkc->event_count = 0;
d36b8583 223 lkc->enabled = 1;
753873bf 224 lkc->published_to_notification_thread = false;
54012638
DG
225 /* Init linked list */
226 CDS_INIT_LIST_HEAD(&lkc->events_list.head);
227 CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
645328ae 228 CDS_INIT_LIST_HEAD(&lkc->ctx_list);
54012638
DG
229
230 return lkc;
231
232error:
e9404c27
JG
233 if (lkc) {
234 free(lkc->channel);
235 }
236 free(extended);
237 free(lkc);
54012638
DG
238 return NULL;
239}
240
645328ae
DG
241/*
242 * Allocate and init a kernel context object.
243 *
244 * Return the allocated object or NULL on error.
245 */
246struct ltt_kernel_context *trace_kernel_create_context(
247 struct lttng_kernel_context *ctx)
248{
249 struct ltt_kernel_context *kctx;
250
251 kctx = zmalloc(sizeof(*kctx));
252 if (!kctx) {
253 PERROR("zmalloc kernel context");
254 goto error;
255 }
256
257 if (ctx) {
258 memcpy(&kctx->ctx, ctx, sizeof(kctx->ctx));
259 }
df3c77c8
JG
260error:
261 return kctx;
262}
645328ae 263
df3c77c8
JG
264/*
265 * Allocate and init a kernel context object from an existing kernel context
266 * object.
267 *
268 * Return the allocated object or NULL on error.
269 */
270struct ltt_kernel_context *trace_kernel_copy_context(
271 struct ltt_kernel_context *kctx)
272{
273 struct ltt_kernel_context *kctx_copy;
274
275 assert(kctx);
276 kctx_copy = zmalloc(sizeof(*kctx_copy));
277 if (!kctx_copy) {
278 PERROR("zmalloc ltt_kernel_context");
279 goto error;
280 }
281
282 memcpy(kctx_copy, kctx, sizeof(*kctx_copy));
283 memset(&kctx_copy->list, 0, sizeof(kctx_copy->list));
7b9445b3 284
645328ae 285error:
df3c77c8 286 return kctx_copy;
645328ae
DG
287}
288
54012638 289/*
050349bb 290 * Allocate and initialize a kernel event. Set name and event type.
a969e101 291 * We own filter_expression, and filter.
54012638 292 *
050349bb 293 * Return pointer to structure or NULL.
54012638 294 */
71a3bb01
FD
295enum lttng_error_code trace_kernel_create_event(
296 struct lttng_event *ev, char *filter_expression,
297 struct lttng_filter_bytecode *filter,
298 struct ltt_kernel_event **kernel_event)
54012638 299{
71a3bb01 300 enum lttng_error_code ret;
54012638 301 struct lttng_kernel_event *attr;
71a3bb01 302 struct ltt_kernel_event *local_kernel_event;
54012638 303
0525e9ae
DG
304 assert(ev);
305
71a3bb01 306 local_kernel_event = zmalloc(sizeof(struct ltt_kernel_event));
ba7f0ae5 307 attr = zmalloc(sizeof(struct lttng_kernel_event));
71a3bb01 308 if (local_kernel_event == NULL || attr == NULL) {
df0f840b 309 PERROR("kernel event zmalloc");
71a3bb01 310 ret = LTTNG_ERR_NOMEM;
54012638
DG
311 goto error;
312 }
313
f3ed775e 314 switch (ev->type) {
7d29a247 315 case LTTNG_EVENT_PROBE:
e6ddca71 316 attr->instrumentation = LTTNG_KERNEL_KPROBE;
7d29a247
DG
317 attr->u.kprobe.addr = ev->attr.probe.addr;
318 attr->u.kprobe.offset = ev->attr.probe.offset;
f3ed775e 319 strncpy(attr->u.kprobe.symbol_name,
dbbb3ec5
DG
320 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
321 attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e
DG
322 break;
323 case LTTNG_EVENT_FUNCTION:
8f0d098b
MD
324 attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
325 attr->u.kretprobe.addr = ev->attr.probe.addr;
326 attr->u.kretprobe.offset = ev->attr.probe.offset;
8f0d098b 327 strncpy(attr->u.kretprobe.symbol_name,
dbbb3ec5
DG
328 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
329 attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
8f0d098b
MD
330 break;
331 case LTTNG_EVENT_FUNCTION_ENTRY:
f3ed775e
DG
332 attr->instrumentation = LTTNG_KERNEL_FUNCTION;
333 strncpy(attr->u.ftrace.symbol_name,
dbbb3ec5
DG
334 ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
335 attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 336 break;
e6ddca71
DG
337 case LTTNG_EVENT_TRACEPOINT:
338 attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
f3ed775e 339 break;
a54bd42d
MD
340 case LTTNG_EVENT_SYSCALL:
341 attr->instrumentation = LTTNG_KERNEL_SYSCALL;
0133c199 342 break;
7a3d1328
MD
343 case LTTNG_EVENT_ALL:
344 attr->instrumentation = LTTNG_KERNEL_ALL;
345 break;
f3ed775e
DG
346 default:
347 ERR("Unknown kernel instrumentation type (%d)", ev->type);
71a3bb01 348 ret = LTTNG_ERR_INVALID;
f3ed775e
DG
349 goto error;
350 }
351
352 /* Copy event name */
dbbb3ec5
DG
353 strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN);
354 attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 355
54012638 356 /* Setting up a kernel event */
71a3bb01
FD
357 local_kernel_event->fd = -1;
358 local_kernel_event->event = attr;
359 local_kernel_event->enabled = 1;
360 local_kernel_event->filter_expression = filter_expression;
361 local_kernel_event->filter = filter;
54012638 362
71a3bb01
FD
363 *kernel_event = local_kernel_event;
364
365 return LTTNG_OK;
54012638
DG
366
367error:
a969e101
MD
368 free(filter_expression);
369 free(filter);
71a3bb01 370 free(local_kernel_event);
a2c0da86 371 free(attr);
71a3bb01 372 return ret;
54012638
DG
373}
374
375/*
050349bb 376 * Allocate and initialize a kernel metadata.
54012638 377 *
050349bb 378 * Return pointer to structure or NULL.
54012638 379 */
a4b92340 380struct ltt_kernel_metadata *trace_kernel_create_metadata(void)
54012638 381{
54012638 382 struct ltt_kernel_metadata *lkm;
f3ed775e 383 struct lttng_channel *chan;
54012638 384
ba7f0ae5
DG
385 lkm = zmalloc(sizeof(struct ltt_kernel_metadata));
386 chan = zmalloc(sizeof(struct lttng_channel));
f3ed775e 387 if (lkm == NULL || chan == NULL) {
df0f840b 388 PERROR("kernel metadata zmalloc");
54012638
DG
389 goto error;
390 }
391
392 /* Set default attributes */
f3ed775e 393 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
3e230f92 394 chan->attr.subbuf_size = default_get_metadata_subbuf_size();
b389abbe 395 chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
6bb9e85f
MD
396 chan->attr.switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
397 chan->attr.read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
7d452e12 398 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
54012638
DG
399
400 /* Init metadata */
03550b58 401 lkm->fd = -1;
f3ed775e 402 lkm->conf = chan;
54012638
DG
403
404 return lkm;
405
406error:
a2c0da86
MD
407 free(lkm);
408 free(chan);
54012638
DG
409 return NULL;
410}
411
412/*
050349bb
DG
413 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
414 * default.
54012638 415 *
050349bb 416 * Return pointer to structure or NULL.
54012638 417 */
00e2e675
DG
418struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
419 unsigned int count)
54012638 420{
00e2e675 421 int ret;
54012638
DG
422 struct ltt_kernel_stream *lks;
423
0525e9ae
DG
424 assert(name);
425
ba7f0ae5 426 lks = zmalloc(sizeof(struct ltt_kernel_stream));
54012638 427 if (lks == NULL) {
df0f840b 428 PERROR("kernel stream zmalloc");
54012638
DG
429 goto error;
430 }
431
00e2e675 432 /* Set name */
535b8ff4 433 ret = snprintf(lks->name, sizeof(lks->name), "%s_%u", name, count);
00e2e675
DG
434 if (ret < 0) {
435 PERROR("snprintf stream name");
436 goto error;
437 }
438 lks->name[sizeof(lks->name) - 1] = '\0';
439
54012638 440 /* Init stream */
03550b58 441 lks->fd = -1;
54012638 442 lks->state = 0;
ffe60014 443 lks->cpu = count;
54012638
DG
444
445 return lks;
446
447error:
448 return NULL;
449}
c363b55d 450
050349bb
DG
451/*
452 * Cleanup kernel stream structure.
453 */
62499ad6 454void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
c363b55d 455{
0525e9ae
DG
456 assert(stream);
457
33a2b854 458 DBG("[trace] Closing stream fd %d", stream->fd);
c363b55d 459 /* Close kernel fd */
03550b58 460 if (stream->fd >= 0) {
c617c0c6
MD
461 int ret;
462
03550b58
MD
463 ret = close(stream->fd);
464 if (ret) {
465 PERROR("close");
466 }
799e2c4f 467 }
c363b55d
DG
468 /* Remove from stream list */
469 cds_list_del(&stream->list);
f9815039 470
c363b55d
DG
471 free(stream);
472}
473
050349bb
DG
474/*
475 * Cleanup kernel event structure.
476 */
62499ad6 477void trace_kernel_destroy_event(struct ltt_kernel_event *event)
c363b55d 478{
0525e9ae
DG
479 assert(event);
480
87eb4ab8 481 if (event->fd >= 0) {
c617c0c6
MD
482 int ret;
483
87eb4ab8
MD
484 DBG("[trace] Closing event fd %d", event->fd);
485 /* Close kernel fd */
799e2c4f
MD
486 ret = close(event->fd);
487 if (ret) {
488 PERROR("close");
489 }
87eb4ab8
MD
490 } else {
491 DBG("[trace] Tearing down event (no associated fd)");
492 }
c363b55d
DG
493
494 /* Remove from event list */
495 cds_list_del(&event->list);
f9815039 496
00a62084
MD
497 free(event->filter_expression);
498 free(event->filter);
499
f9815039 500 free(event->event);
c363b55d
DG
501 free(event);
502}
503
645328ae
DG
504/*
505 * Cleanup kernel context structure.
506 */
507void trace_kernel_destroy_context(struct ltt_kernel_context *ctx)
508{
509 assert(ctx);
510
ba985c3a
JG
511 if (ctx->in_list) {
512 cds_list_del(&ctx->list);
513 }
645328ae
DG
514 free(ctx);
515}
516
050349bb
DG
517/*
518 * Cleanup kernel channel structure.
519 */
62499ad6 520void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
c363b55d 521{
af9737e9
DG
522 struct ltt_kernel_stream *stream, *stmp;
523 struct ltt_kernel_event *event, *etmp;
645328ae 524 struct ltt_kernel_context *ctx, *ctmp;
799e2c4f 525 int ret;
e9404c27 526 enum lttng_error_code status;
c363b55d 527
0525e9ae
DG
528 assert(channel);
529
33a2b854 530 DBG("[trace] Closing channel fd %d", channel->fd);
c363b55d 531 /* Close kernel fd */
03550b58
MD
532 if (channel->fd >= 0) {
533 ret = close(channel->fd);
534 if (ret) {
535 PERROR("close");
536 }
799e2c4f 537 }
c363b55d
DG
538
539 /* For each stream in the channel list */
af9737e9 540 cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
62499ad6 541 trace_kernel_destroy_stream(stream);
c363b55d
DG
542 }
543
544 /* For each event in the channel list */
af9737e9 545 cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
62499ad6 546 trace_kernel_destroy_event(event);
c363b55d
DG
547 }
548
645328ae
DG
549 /* For each context in the channel list */
550 cds_list_for_each_entry_safe(ctx, ctmp, &channel->ctx_list, list) {
551 trace_kernel_destroy_context(ctx);
552 }
553
c363b55d
DG
554 /* Remove from channel list */
555 cds_list_del(&channel->list);
f9815039 556
753873bf
JR
557 if (notification_thread_handle
558 && channel->published_to_notification_thread) {
63aaa3dc
JG
559 status = notification_thread_command_remove_channel(
560 notification_thread_handle,
e1f3997a 561 channel->key, LTTNG_DOMAIN_KERNEL);
63aaa3dc
JG
562 assert(status == LTTNG_OK);
563 }
e9404c27 564 free(channel->channel->attr.extended.ptr);
f9815039 565 free(channel->channel);
c363b55d
DG
566 free(channel);
567}
568
050349bb
DG
569/*
570 * Cleanup kernel metadata structure.
571 */
62499ad6 572void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
c363b55d 573{
0525e9ae
DG
574 assert(metadata);
575
33a2b854 576 DBG("[trace] Closing metadata fd %d", metadata->fd);
c363b55d 577 /* Close kernel fd */
03550b58 578 if (metadata->fd >= 0) {
c617c0c6
MD
579 int ret;
580
03550b58
MD
581 ret = close(metadata->fd);
582 if (ret) {
583 PERROR("close");
584 }
799e2c4f 585 }
c363b55d 586
f9815039 587 free(metadata->conf);
c363b55d
DG
588 free(metadata);
589}
590
050349bb 591/*
62499ad6 592 * Cleanup kernel session structure
36b588ed
MD
593 *
594 * Should *NOT* be called with RCU read-side lock held.
050349bb 595 */
62499ad6 596void trace_kernel_destroy_session(struct ltt_kernel_session *session)
c363b55d 597{
af9737e9 598 struct ltt_kernel_channel *channel, *ctmp;
799e2c4f 599 int ret;
c363b55d 600
0525e9ae
DG
601 assert(session);
602
33a2b854 603 DBG("[trace] Closing session fd %d", session->fd);
c363b55d 604 /* Close kernel fds */
03550b58
MD
605 if (session->fd >= 0) {
606 ret = close(session->fd);
607 if (ret) {
608 PERROR("close");
609 }
799e2c4f 610 }
f9815039 611
03550b58 612 if (session->metadata_stream_fd >= 0) {
70dc1c34 613 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
799e2c4f
MD
614 ret = close(session->metadata_stream_fd);
615 if (ret) {
616 PERROR("close");
617 }
70dc1c34 618 }
c363b55d 619
d36b8583 620 if (session->metadata != NULL) {
62499ad6 621 trace_kernel_destroy_metadata(session->metadata);
d36b8583 622 }
c363b55d 623
af9737e9 624 cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
62499ad6 625 trace_kernel_destroy_channel(channel);
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626 }
627
00e2e675 628 /* Wipe consumer output object */
6addfa37 629 consumer_output_put(session->consumer);
00e2e675 630
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631 free(session);
632}
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