Fix possible NULL pointer dereference
[lttng-tools.git] / lttng-sessiond / trace-kernel.c
CommitLineData
54012638
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
82a3637f
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6 * as published by the Free Software Foundation; only version 2
7 * of the License.
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8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19#define _GNU_SOURCE
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
c363b55d 23#include <unistd.h>
54012638 24
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25#include <lttngerr.h>
26
62499ad6 27#include "trace-kernel.h"
54012638 28
19e70852 29/*
050349bb 30 * Find the channel name for the given kernel session.
19e70852 31 */
62499ad6 32struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
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33 char *name, struct ltt_kernel_session *session)
34{
35 struct ltt_kernel_channel *chan;
36
37 if (session == NULL) {
38 ERR("Undefine session");
39 goto error;
40 }
41
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42 DBG("Trying to find channel %s", name);
43
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44 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
45 if (strcmp(name, chan->channel->name) == 0) {
46 DBG("Found channel by name %s", name);
47 return chan;
48 }
49 }
50
51error:
52 return NULL;
53}
54
55/*
050349bb 56 * Find the event name for the given channel.
19e70852 57 */
62499ad6 58struct ltt_kernel_event *trace_kernel_get_event_by_name(
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59 char *name, struct ltt_kernel_channel *channel)
60{
61 struct ltt_kernel_event *ev;
62
63 if (channel == NULL) {
64 ERR("Undefine channel");
65 goto error;
66 }
67
68 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
69 if (strcmp(name, ev->event->name) == 0) {
70 DBG("Found event by name %s for channel %s", name,
71 channel->channel->name);
72 return ev;
73 }
74 }
75
76error:
77 return NULL;
78}
79
54012638 80/*
050349bb 81 * Allocate and initialize a kernel session data structure.
54012638 82 *
050349bb 83 * Return pointer to structure or NULL.
54012638 84 */
f9815039 85struct ltt_kernel_session *trace_kernel_create_session(char *path)
54012638 86{
f9815039 87 int ret;
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88 struct ltt_kernel_session *lks;
89
90 /* Allocate a new ltt kernel session */
91 lks = malloc(sizeof(struct ltt_kernel_session));
92 if (lks == NULL) {
93 perror("create kernel session malloc");
94 goto error;
95 }
96
97 /* Init data structure */
98 lks->fd = 0;
99 lks->metadata_stream_fd = 0;
100 lks->channel_count = 0;
101 lks->stream_count_global = 0;
102 lks->metadata = NULL;
d9800920 103 lks->consumer_fd = 0;
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104 CDS_INIT_LIST_HEAD(&lks->channel_list.head);
105
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106 /* Set session path */
107 ret = asprintf(&lks->trace_path, "%s/kernel", path);
108 if (ret < 0) {
109 perror("asprintf kernel traces path");
110 goto error;
111 }
112
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113 return lks;
114
115error:
116 return NULL;
117}
118
119/*
050349bb 120 * Allocate and initialize a kernel channel data structure.
54012638 121 *
050349bb 122 * Return pointer to structure or NULL.
54012638 123 */
62499ad6 124struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path)
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125{
126 int ret;
127 struct ltt_kernel_channel *lkc;
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128
129 lkc = malloc(sizeof(struct ltt_kernel_channel));
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130 if (lkc == NULL) {
131 perror("ltt_kernel_channel malloc");
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132 goto error;
133 }
134
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135 lkc->channel = malloc(sizeof(struct lttng_channel));
136 if (lkc->channel == NULL) {
137 perror("lttng_channel malloc");
138 goto error;
139 }
140 memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
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141
142 lkc->fd = 0;
143 lkc->stream_count = 0;
cbbbb275 144 lkc->event_count = 0;
d36b8583 145 lkc->enabled = 1;
e75cda3a 146 lkc->ctx = NULL;
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147 /* Init linked list */
148 CDS_INIT_LIST_HEAD(&lkc->events_list.head);
149 CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
150 /* Set default trace output path */
b082db07 151 ret = asprintf(&lkc->pathname, "%s", path);
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152 if (ret < 0) {
153 perror("asprintf kernel create channel");
154 goto error;
155 }
156
157 return lkc;
158
159error:
160 return NULL;
161}
162
163/*
050349bb 164 * Allocate and initialize a kernel event. Set name and event type.
54012638 165 *
050349bb 166 * Return pointer to structure or NULL.
54012638 167 */
62499ad6 168struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev)
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169{
170 struct ltt_kernel_event *lke;
171 struct lttng_kernel_event *attr;
172
173 lke = malloc(sizeof(struct ltt_kernel_event));
174 attr = malloc(sizeof(struct lttng_kernel_event));
175 if (lke == NULL || attr == NULL) {
176 perror("kernel event malloc");
177 goto error;
178 }
179
f3ed775e 180 switch (ev->type) {
7d29a247 181 case LTTNG_EVENT_PROBE:
e6ddca71 182 attr->instrumentation = LTTNG_KERNEL_KPROBE;
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183 attr->u.kprobe.addr = ev->attr.probe.addr;
184 attr->u.kprobe.offset = ev->attr.probe.offset;
f3ed775e 185 strncpy(attr->u.kprobe.symbol_name,
7d29a247 186 ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN);
99497cd0 187 attr->u.kprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
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188 break;
189 case LTTNG_EVENT_FUNCTION:
8f0d098b
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190 attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
191 attr->u.kretprobe.addr = ev->attr.probe.addr;
192 attr->u.kretprobe.offset = ev->attr.probe.offset;
193 attr->u.kretprobe.offset = ev->attr.probe.offset;
194 strncpy(attr->u.kretprobe.symbol_name,
195 ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN);
99497cd0 196 attr->u.kretprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
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197 break;
198 case LTTNG_EVENT_FUNCTION_ENTRY:
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199 attr->instrumentation = LTTNG_KERNEL_FUNCTION;
200 strncpy(attr->u.ftrace.symbol_name,
201 ev->attr.ftrace.symbol_name, LTTNG_SYM_NAME_LEN);
99497cd0 202 attr->u.ftrace.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
f3ed775e 203 break;
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204 case LTTNG_EVENT_TRACEPOINT:
205 attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
f3ed775e 206 break;
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207 case LTTNG_EVENT_SYSCALL:
208 attr->instrumentation = LTTNG_KERNEL_SYSCALL;
0133c199 209 break;
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210 case LTTNG_EVENT_ALL:
211 attr->instrumentation = LTTNG_KERNEL_ALL;
212 break;
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213 default:
214 ERR("Unknown kernel instrumentation type (%d)", ev->type);
215 goto error;
216 }
217
218 /* Copy event name */
219 strncpy(attr->name, ev->name, LTTNG_SYM_NAME_LEN);
99497cd0 220 attr->name[LTTNG_SYM_NAME_LEN - 1] = '\0';
f3ed775e 221
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222 /* Setting up a kernel event */
223 lke->fd = 0;
224 lke->event = attr;
d36b8583 225 lke->enabled = 1;
e75cda3a 226 lke->ctx = NULL;
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227
228 return lke;
229
230error:
231 return NULL;
232}
233
234/*
050349bb 235 * Allocate and initialize a kernel metadata.
54012638 236 *
050349bb 237 * Return pointer to structure or NULL.
54012638 238 */
62499ad6 239struct ltt_kernel_metadata *trace_kernel_create_metadata(char *path)
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240{
241 int ret;
242 struct ltt_kernel_metadata *lkm;
f3ed775e 243 struct lttng_channel *chan;
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244
245 lkm = malloc(sizeof(struct ltt_kernel_metadata));
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246 chan = malloc(sizeof(struct lttng_channel));
247 if (lkm == NULL || chan == NULL) {
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248 perror("kernel metadata malloc");
249 goto error;
250 }
251
252 /* Set default attributes */
f3ed775e 253 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
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254 chan->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
255 chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
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256 chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
257 chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
7d452e12 258 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
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259
260 /* Init metadata */
261 lkm->fd = 0;
f3ed775e 262 lkm->conf = chan;
54012638 263 /* Set default metadata path */
58a97671 264 ret = asprintf(&lkm->pathname, "%s/metadata", path);
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265 if (ret < 0) {
266 perror("asprintf kernel metadata");
267 goto error;
268 }
269
270 return lkm;
271
272error:
273 return NULL;
274}
275
276/*
050349bb
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277 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
278 * default.
54012638 279 *
050349bb 280 * Return pointer to structure or NULL.
54012638 281 */
62499ad6 282struct ltt_kernel_stream *trace_kernel_create_stream(void)
54012638
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283{
284 struct ltt_kernel_stream *lks;
285
286 lks = malloc(sizeof(struct ltt_kernel_stream));
287 if (lks == NULL) {
288 perror("kernel stream malloc");
289 goto error;
290 }
291
292 /* Init stream */
293 lks->fd = 0;
294 lks->pathname = NULL;
295 lks->state = 0;
296
297 return lks;
298
299error:
300 return NULL;
301}
c363b55d 302
050349bb
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303/*
304 * Cleanup kernel stream structure.
305 */
62499ad6 306void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
c363b55d 307{
33a2b854 308 DBG("[trace] Closing stream fd %d", stream->fd);
c363b55d
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309 /* Close kernel fd */
310 close(stream->fd);
c363b55d
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311 /* Remove from stream list */
312 cds_list_del(&stream->list);
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313
314 free(stream->pathname);
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315 free(stream);
316}
317
050349bb
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318/*
319 * Cleanup kernel event structure.
320 */
62499ad6 321void trace_kernel_destroy_event(struct ltt_kernel_event *event)
c363b55d 322{
33a2b854 323 DBG("[trace] Closing event fd %d", event->fd);
c363b55d
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324 /* Close kernel fd */
325 close(event->fd);
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326
327 /* Remove from event list */
328 cds_list_del(&event->list);
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329
330 free(event->event);
331 free(event->ctx);
c363b55d
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332 free(event);
333}
334
050349bb
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335/*
336 * Cleanup kernel channel structure.
337 */
62499ad6 338void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
c363b55d 339{
af9737e9
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340 struct ltt_kernel_stream *stream, *stmp;
341 struct ltt_kernel_event *event, *etmp;
c363b55d 342
33a2b854 343 DBG("[trace] Closing channel fd %d", channel->fd);
c363b55d
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344 /* Close kernel fd */
345 close(channel->fd);
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346
347 /* For each stream in the channel list */
af9737e9 348 cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
62499ad6 349 trace_kernel_destroy_stream(stream);
c363b55d
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350 }
351
352 /* For each event in the channel list */
af9737e9 353 cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
62499ad6 354 trace_kernel_destroy_event(event);
c363b55d
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355 }
356
357 /* Remove from channel list */
358 cds_list_del(&channel->list);
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359
360 free(channel->pathname);
361 free(channel->channel);
362 free(channel->ctx);
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363 free(channel);
364}
365
050349bb
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366/*
367 * Cleanup kernel metadata structure.
368 */
62499ad6 369void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
c363b55d 370{
33a2b854 371 DBG("[trace] Closing metadata fd %d", metadata->fd);
c363b55d
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372 /* Close kernel fd */
373 close(metadata->fd);
c363b55d 374
f9815039
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375 free(metadata->conf);
376 free(metadata->pathname);
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377 free(metadata);
378}
379
050349bb 380/*
62499ad6 381 * Cleanup kernel session structure
050349bb 382 */
62499ad6 383void trace_kernel_destroy_session(struct ltt_kernel_session *session)
c363b55d 384{
af9737e9 385 struct ltt_kernel_channel *channel, *ctmp;
c363b55d 386
33a2b854 387 DBG("[trace] Closing session fd %d", session->fd);
c363b55d
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388 /* Close kernel fds */
389 close(session->fd);
f9815039 390
70dc1c34
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391 if (session->metadata_stream_fd != 0) {
392 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
393 close(session->metadata_stream_fd);
394 }
c363b55d 395
d36b8583 396 if (session->metadata != NULL) {
62499ad6 397 trace_kernel_destroy_metadata(session->metadata);
d36b8583 398 }
c363b55d 399
af9737e9 400 cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
62499ad6 401 trace_kernel_destroy_channel(channel);
c363b55d
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402 }
403
f9815039 404 free(session->trace_path);
c363b55d
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405 free(session);
406}
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