Add liblttng-ctl destructor to cleanup memory
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.c
CommitLineData
54012638
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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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
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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 *
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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.
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16 */
17
18#define _GNU_SOURCE
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
c363b55d 22#include <unistd.h>
54012638 23
990570ed
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24#include <common/common.h>
25#include <common/defaults.h>
1e307fab 26
00e2e675 27#include "consumer.h"
62499ad6 28#include "trace-kernel.h"
54012638 29
19e70852 30/*
050349bb 31 * Find the channel name for the given kernel session.
19e70852 32 */
62499ad6 33struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
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34 char *name, struct ltt_kernel_session *session)
35{
36 struct ltt_kernel_channel *chan;
37
38 if (session == NULL) {
39 ERR("Undefine session");
40 goto error;
41 }
42
54d01ffb
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43 DBG("Trying to find channel %s", name);
44
19e70852
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45 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
46 if (strcmp(name, chan->channel->name) == 0) {
47 DBG("Found channel by name %s", name);
48 return chan;
49 }
50 }
51
52error:
53 return NULL;
54}
55
56/*
050349bb 57 * Find the event name for the given channel.
19e70852 58 */
62499ad6 59struct ltt_kernel_event *trace_kernel_get_event_by_name(
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60 char *name, struct ltt_kernel_channel *channel)
61{
62 struct ltt_kernel_event *ev;
63
64 if (channel == NULL) {
65 ERR("Undefine channel");
66 goto error;
67 }
68
69 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
70 if (strcmp(name, ev->event->name) == 0) {
71 DBG("Found event by name %s for channel %s", name,
72 channel->channel->name);
73 return ev;
74 }
75 }
76
77error:
78 return NULL;
79}
80
54012638 81/*
050349bb 82 * Allocate and initialize a kernel session data structure.
54012638 83 *
050349bb 84 * Return pointer to structure or NULL.
54012638 85 */
f9815039 86struct ltt_kernel_session *trace_kernel_create_session(char *path)
54012638 87{
f9815039 88 int ret;
a4b92340 89 struct ltt_kernel_session *lks = NULL;
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90
91 /* Allocate a new ltt kernel session */
ba7f0ae5 92 lks = zmalloc(sizeof(struct ltt_kernel_session));
54012638 93 if (lks == NULL) {
df0f840b 94 PERROR("create kernel session zmalloc");
a4b92340 95 goto alloc_error;
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96 }
97
98 /* Init data structure */
03550b58
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99 lks->fd = -1;
100 lks->metadata_stream_fd = -1;
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101 lks->channel_count = 0;
102 lks->stream_count_global = 0;
103 lks->metadata = NULL;
104 CDS_INIT_LIST_HEAD(&lks->channel_list.head);
105
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106 lks->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
107 if (lks->consumer == NULL) {
108 goto error;
109 }
110
111 /*
112 * The tmp_consumer stays NULL until a set_consumer_uri command is
113 * executed. At this point, the consumer should be nullify until an
114 * enable_consumer command. This assignment is symbolic since we've zmalloc
115 * the struct.
116 */
117 lks->tmp_consumer = NULL;
118
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119 if (path && strlen(path) > 0) {
120 /* Use the default consumer output which is the tracing session path. */
121 ret = snprintf(lks->consumer->dst.trace_path, PATH_MAX,
122 "%s" DEFAULT_KERNEL_TRACE_DIR, path);
123 if (ret < 0) {
124 PERROR("snprintf consumer trace path");
125 goto error;
126 }
00e2e675 127
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128 /* Set session path */
129 ret = asprintf(&lks->trace_path, "%s" DEFAULT_KERNEL_TRACE_DIR, path);
130 if (ret < 0) {
131 PERROR("asprintf kernel traces path");
132 goto error;
133 }
f9815039
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134 }
135
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136 return lks;
137
138error:
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139 free(lks);
140
141alloc_error:
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142 return NULL;
143}
144
145/*
050349bb 146 * Allocate and initialize a kernel channel data structure.
54012638 147 *
050349bb 148 * Return pointer to structure or NULL.
54012638 149 */
00e2e675
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150struct ltt_kernel_channel *trace_kernel_create_channel(
151 struct lttng_channel *chan, char *path)
54012638 152{
54012638 153 struct ltt_kernel_channel *lkc;
54012638 154
ba7f0ae5 155 lkc = zmalloc(sizeof(struct ltt_kernel_channel));
f3ed775e 156 if (lkc == NULL) {
df0f840b 157 PERROR("ltt_kernel_channel zmalloc");
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158 goto error;
159 }
160
ba7f0ae5 161 lkc->channel = zmalloc(sizeof(struct lttng_channel));
f3ed775e 162 if (lkc->channel == NULL) {
df0f840b 163 PERROR("lttng_channel zmalloc");
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164 goto error;
165 }
166 memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
54012638 167
03550b58 168 lkc->fd = -1;
54012638 169 lkc->stream_count = 0;
cbbbb275 170 lkc->event_count = 0;
d36b8583 171 lkc->enabled = 1;
e75cda3a 172 lkc->ctx = NULL;
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173 /* Init linked list */
174 CDS_INIT_LIST_HEAD(&lkc->events_list.head);
175 CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
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176
177 return lkc;
178
179error:
180 return NULL;
181}
182
183/*
050349bb 184 * Allocate and initialize a kernel event. Set name and event type.
54012638 185 *
050349bb 186 * Return pointer to structure or NULL.
54012638 187 */
62499ad6 188struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev)
54012638
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189{
190 struct ltt_kernel_event *lke;
191 struct lttng_kernel_event *attr;
192
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193 lke = zmalloc(sizeof(struct ltt_kernel_event));
194 attr = zmalloc(sizeof(struct lttng_kernel_event));
54012638 195 if (lke == NULL || attr == NULL) {
df0f840b 196 PERROR("kernel event zmalloc");
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197 goto error;
198 }
199
f3ed775e 200 switch (ev->type) {
7d29a247 201 case LTTNG_EVENT_PROBE:
e6ddca71 202 attr->instrumentation = LTTNG_KERNEL_KPROBE;
7d29a247
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203 attr->u.kprobe.addr = ev->attr.probe.addr;
204 attr->u.kprobe.offset = ev->attr.probe.offset;
f3ed775e 205 strncpy(attr->u.kprobe.symbol_name,
dbbb3ec5
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206 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
207 attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
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208 break;
209 case LTTNG_EVENT_FUNCTION:
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210 attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
211 attr->u.kretprobe.addr = ev->attr.probe.addr;
212 attr->u.kretprobe.offset = ev->attr.probe.offset;
213 attr->u.kretprobe.offset = ev->attr.probe.offset;
214 strncpy(attr->u.kretprobe.symbol_name,
dbbb3ec5
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215 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
216 attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
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217 break;
218 case LTTNG_EVENT_FUNCTION_ENTRY:
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219 attr->instrumentation = LTTNG_KERNEL_FUNCTION;
220 strncpy(attr->u.ftrace.symbol_name,
dbbb3ec5
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221 ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
222 attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 223 break;
e6ddca71
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224 case LTTNG_EVENT_TRACEPOINT:
225 attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
f3ed775e 226 break;
a54bd42d
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227 case LTTNG_EVENT_SYSCALL:
228 attr->instrumentation = LTTNG_KERNEL_SYSCALL;
0133c199 229 break;
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230 case LTTNG_EVENT_ALL:
231 attr->instrumentation = LTTNG_KERNEL_ALL;
232 break;
f3ed775e
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233 default:
234 ERR("Unknown kernel instrumentation type (%d)", ev->type);
235 goto error;
236 }
237
238 /* Copy event name */
dbbb3ec5
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239 strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN);
240 attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 241
54012638 242 /* Setting up a kernel event */
03550b58 243 lke->fd = -1;
54012638 244 lke->event = attr;
d36b8583 245 lke->enabled = 1;
e75cda3a 246 lke->ctx = NULL;
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247
248 return lke;
249
250error:
a2c0da86
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251 free(lke);
252 free(attr);
54012638
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253 return NULL;
254}
255
256/*
050349bb 257 * Allocate and initialize a kernel metadata.
54012638 258 *
050349bb 259 * Return pointer to structure or NULL.
54012638 260 */
a4b92340 261struct ltt_kernel_metadata *trace_kernel_create_metadata(void)
54012638 262{
54012638 263 struct ltt_kernel_metadata *lkm;
f3ed775e 264 struct lttng_channel *chan;
54012638 265
ba7f0ae5
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266 lkm = zmalloc(sizeof(struct ltt_kernel_metadata));
267 chan = zmalloc(sizeof(struct lttng_channel));
f3ed775e 268 if (lkm == NULL || chan == NULL) {
df0f840b 269 PERROR("kernel metadata zmalloc");
54012638
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270 goto error;
271 }
272
273 /* Set default attributes */
f3ed775e 274 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
b389abbe
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275 chan->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
276 chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
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277 chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
278 chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
7d452e12 279 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
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280
281 /* Init metadata */
03550b58 282 lkm->fd = -1;
f3ed775e 283 lkm->conf = chan;
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284
285 return lkm;
286
287error:
a2c0da86
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288 free(lkm);
289 free(chan);
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290 return NULL;
291}
292
293/*
050349bb
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294 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
295 * default.
54012638 296 *
050349bb 297 * Return pointer to structure or NULL.
54012638 298 */
00e2e675
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299struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
300 unsigned int count)
54012638 301{
00e2e675 302 int ret;
54012638
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303 struct ltt_kernel_stream *lks;
304
ba7f0ae5 305 lks = zmalloc(sizeof(struct ltt_kernel_stream));
54012638 306 if (lks == NULL) {
df0f840b 307 PERROR("kernel stream zmalloc");
54012638
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308 goto error;
309 }
310
00e2e675
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311 /* Set name */
312 ret = snprintf(lks->name, sizeof(lks->name), "%s_%d", name, count);
313 if (ret < 0) {
314 PERROR("snprintf stream name");
315 goto error;
316 }
317 lks->name[sizeof(lks->name) - 1] = '\0';
318
54012638 319 /* Init stream */
03550b58 320 lks->fd = -1;
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321 lks->state = 0;
322
323 return lks;
324
325error:
326 return NULL;
327}
c363b55d 328
050349bb
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329/*
330 * Cleanup kernel stream structure.
331 */
62499ad6 332void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
c363b55d 333{
799e2c4f
MD
334 int ret;
335
33a2b854 336 DBG("[trace] Closing stream fd %d", stream->fd);
c363b55d 337 /* Close kernel fd */
03550b58
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338 if (stream->fd >= 0) {
339 ret = close(stream->fd);
340 if (ret) {
341 PERROR("close");
342 }
799e2c4f 343 }
c363b55d
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344 /* Remove from stream list */
345 cds_list_del(&stream->list);
f9815039 346
c363b55d
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347 free(stream);
348}
349
050349bb
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350/*
351 * Cleanup kernel event structure.
352 */
62499ad6 353void trace_kernel_destroy_event(struct ltt_kernel_event *event)
c363b55d 354{
799e2c4f
MD
355 int ret;
356
87eb4ab8
MD
357 if (event->fd >= 0) {
358 DBG("[trace] Closing event fd %d", event->fd);
359 /* Close kernel fd */
799e2c4f
MD
360 ret = close(event->fd);
361 if (ret) {
362 PERROR("close");
363 }
87eb4ab8
MD
364 } else {
365 DBG("[trace] Tearing down event (no associated fd)");
366 }
c363b55d
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367
368 /* Remove from event list */
369 cds_list_del(&event->list);
f9815039
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370
371 free(event->event);
372 free(event->ctx);
c363b55d
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373 free(event);
374}
375
050349bb
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376/*
377 * Cleanup kernel channel structure.
378 */
62499ad6 379void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
c363b55d 380{
af9737e9
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381 struct ltt_kernel_stream *stream, *stmp;
382 struct ltt_kernel_event *event, *etmp;
799e2c4f 383 int ret;
c363b55d 384
33a2b854 385 DBG("[trace] Closing channel fd %d", channel->fd);
c363b55d 386 /* Close kernel fd */
03550b58
MD
387 if (channel->fd >= 0) {
388 ret = close(channel->fd);
389 if (ret) {
390 PERROR("close");
391 }
799e2c4f 392 }
c363b55d
DG
393
394 /* For each stream in the channel list */
af9737e9 395 cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
62499ad6 396 trace_kernel_destroy_stream(stream);
c363b55d
DG
397 }
398
399 /* For each event in the channel list */
af9737e9 400 cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
62499ad6 401 trace_kernel_destroy_event(event);
c363b55d
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402 }
403
404 /* Remove from channel list */
405 cds_list_del(&channel->list);
f9815039 406
f9815039
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407 free(channel->channel);
408 free(channel->ctx);
c363b55d
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409 free(channel);
410}
411
050349bb
DG
412/*
413 * Cleanup kernel metadata structure.
414 */
62499ad6 415void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
c363b55d 416{
799e2c4f
MD
417 int ret;
418
33a2b854 419 DBG("[trace] Closing metadata fd %d", metadata->fd);
c363b55d 420 /* Close kernel fd */
03550b58
MD
421 if (metadata->fd >= 0) {
422 ret = close(metadata->fd);
423 if (ret) {
424 PERROR("close");
425 }
799e2c4f 426 }
c363b55d 427
f9815039 428 free(metadata->conf);
c363b55d
DG
429 free(metadata);
430}
431
050349bb 432/*
62499ad6 433 * Cleanup kernel session structure
050349bb 434 */
62499ad6 435void trace_kernel_destroy_session(struct ltt_kernel_session *session)
c363b55d 436{
af9737e9 437 struct ltt_kernel_channel *channel, *ctmp;
799e2c4f 438 int ret;
c363b55d 439
33a2b854 440 DBG("[trace] Closing session fd %d", session->fd);
c363b55d 441 /* Close kernel fds */
03550b58
MD
442 if (session->fd >= 0) {
443 ret = close(session->fd);
444 if (ret) {
445 PERROR("close");
446 }
799e2c4f 447 }
f9815039 448
03550b58 449 if (session->metadata_stream_fd >= 0) {
70dc1c34 450 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
799e2c4f
MD
451 ret = close(session->metadata_stream_fd);
452 if (ret) {
453 PERROR("close");
454 }
70dc1c34 455 }
c363b55d 456
d36b8583 457 if (session->metadata != NULL) {
62499ad6 458 trace_kernel_destroy_metadata(session->metadata);
d36b8583 459 }
c363b55d 460
af9737e9 461 cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
62499ad6 462 trace_kernel_destroy_channel(channel);
c363b55d
DG
463 }
464
00e2e675
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465 /* Wipe consumer output object */
466 consumer_destroy_output(session->consumer);
467 consumer_destroy_output(session->tmp_consumer);
468
f9815039 469 free(session->trace_path);
c363b55d
DG
470 free(session);
471}
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