Add context exist error code
[lttng-tools.git] / lttng-sessiond / trace-ust.c
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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 modify it
5 * under the terms of the GNU General Public License as published by the Free
6 * Software Foundation; only version 2 of the License.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307, USA.
16 */
17
18#define _GNU_SOURCE
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
22#include <unistd.h>
23
24#include <lttngerr.h>
25#include <lttng-share.h>
26
f6a9efaa 27#include "hashtable.h"
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28#include "trace-ust.h"
29
0177d773 30/*
f6a9efaa 31 * Find the channel in the hashtable.
0177d773 32 */
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33struct ltt_ust_channel *trace_ust_find_channel_by_name(struct cds_lfht *ht,
34 char *name)
0177d773 35{
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36 struct cds_lfht_node *node;
37 struct cds_lfht_iter iter;
0177d773 38
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39 rcu_read_lock();
40 node = hashtable_lookup(ht, (void *) name, strlen(name), &iter);
41 if (node == NULL) {
42 rcu_read_unlock();
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43 goto error;
44 }
f6a9efaa 45 rcu_read_unlock();
44d3bd01 46
f6a9efaa 47 DBG2("Trace UST channel %s found by name", name);
0177d773 48
f6a9efaa 49 return caa_container_of(node, struct ltt_ust_channel, node);
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50
51error:
f6a9efaa 52 DBG2("Trace UST channel %s not found by name", name);
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53 return NULL;
54}
55
56/*
f6a9efaa 57 * Find the event in the hashtable.
97ee3a89 58 */
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59struct ltt_ust_event *trace_ust_find_event_by_name(struct cds_lfht *ht,
60 char *name)
97ee3a89 61{
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62 struct cds_lfht_node *node;
63 struct cds_lfht_iter iter;
97ee3a89 64
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65 rcu_read_lock();
66 node = hashtable_lookup(ht, (void *) name, strlen(name), &iter);
67 if (node == NULL) {
68 rcu_read_unlock();
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69 goto error;
70 }
f6a9efaa 71 rcu_read_unlock();
97ee3a89 72
284d8f55 73 DBG2("Trace UST event found by name %s", name);
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74
75 return caa_container_of(node, struct ltt_ust_event, node);
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76
77error:
284d8f55 78 DBG2("Trace UST event NOT found by name %s", name);
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79 return NULL;
80}
81
82/*
83 * Allocate and initialize a ust session data structure.
84 *
85 * Return pointer to structure or NULL.
86 */
48842b30 87struct ltt_ust_session *trace_ust_create_session(char *path, unsigned int uid,
44d3bd01 88 struct lttng_domain *domain)
97ee3a89 89{
0177d773 90 int ret;
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91 struct ltt_ust_session *lus;
92
93 /* Allocate a new ltt ust session */
ba7f0ae5 94 lus = zmalloc(sizeof(struct ltt_ust_session));
97ee3a89 95 if (lus == NULL) {
ba7f0ae5 96 PERROR("create ust session zmalloc");
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97 goto error;
98 }
99
100 /* Init data structure */
48842b30 101 lus->uid = uid;
36dc12cc 102 lus->start_trace = 0;
97ee3a89 103
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104 /* Alloc UST domain hash tables */
105 lus->domain_pid = hashtable_new(0);
106 lus->domain_exec = hashtable_new_str(0);
107
108 /* Alloc UST global domain channels' HT */
109 lus->domain_global.channels = hashtable_new_str(0);
44d3bd01 110
0177d773 111 /* Set session path */
48842b30 112 ret = snprintf(lus->pathname, PATH_MAX, "%s/ust", path);
0177d773 113 if (ret < 0) {
44d3bd01 114 PERROR("snprintf kernel traces path");
44844c29 115 goto error_free_session;
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116 }
117
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118 DBG2("UST trace session create successful");
119
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120 return lus;
121
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122error_free_session:
123 free(lus);
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124error:
125 return NULL;
126}
127
128/*
129 * Allocate and initialize a ust channel data structure.
130 *
131 * Return pointer to structure or NULL.
132 */
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133struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan,
134 char *path)
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135{
136 int ret;
137 struct ltt_ust_channel *luc;
138
37357452 139 luc = zmalloc(sizeof(struct ltt_ust_channel));
97ee3a89 140 if (luc == NULL) {
ba7f0ae5 141 perror("ltt_ust_channel zmalloc");
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142 goto error;
143 }
144
44d3bd01 145 /* Copy UST channel attributes */
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146 luc->attr.overwrite = chan->attr.overwrite;
147 luc->attr.subbuf_size = chan->attr.subbuf_size;
148 luc->attr.num_subbuf = chan->attr.num_subbuf;
149 luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
150 luc->attr.read_timer_interval = chan->attr.read_timer_interval;
151 luc->attr.output = chan->attr.output;
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152
153 /* Translate to UST output enum */
154 switch (luc->attr.output) {
155 default:
156 luc->attr.output = LTTNG_UST_MMAP;
157 break;
97ee3a89 158 }
97ee3a89 159
97ee3a89 160 /* Copy channel name */
44d3bd01 161 strncpy(luc->name, chan->name, sizeof(&luc->name));
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162 luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
163
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164 /* Init node */
165 hashtable_node_init(&luc->node, (void *) luc->name, strlen(luc->name));
166 /* Alloc hash tables */
167 luc->events = hashtable_new_str(0);
168 luc->ctx = hashtable_new_str(0);
169
97ee3a89 170 /* Set trace output path */
48842b30 171 ret = snprintf(luc->pathname, PATH_MAX, "%s", path);
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172 if (ret < 0) {
173 perror("asprintf ust create channel");
44844c29 174 goto error_free_channel;
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175 }
176
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177 DBG2("Trace UST channel %s created", luc->name);
178
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179 return luc;
180
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181error_free_channel:
182 free(luc);
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183error:
184 return NULL;
185}
186
187/*
188 * Allocate and initialize a ust event. Set name and event type.
189 *
190 * Return pointer to structure or NULL.
191 */
192struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev)
193{
194 struct ltt_ust_event *lue;
97ee3a89 195
37357452 196 lue = zmalloc(sizeof(struct ltt_ust_event));
44d3bd01 197 if (lue == NULL) {
ba7f0ae5 198 PERROR("ust event zmalloc");
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199 goto error;
200 }
201
202 switch (ev->type) {
203 case LTTNG_EVENT_PROBE:
44d3bd01 204 lue->attr.instrumentation = LTTNG_UST_PROBE;
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205 break;
206 case LTTNG_EVENT_FUNCTION:
44d3bd01 207 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
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208 break;
209 case LTTNG_EVENT_FUNCTION_ENTRY:
44d3bd01 210 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
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211 break;
212 case LTTNG_EVENT_TRACEPOINT:
44d3bd01 213 lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
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214 break;
215 default:
216 ERR("Unknown ust instrumentation type (%d)", ev->type);
44844c29 217 goto error_free_event;
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218 }
219
220 /* Copy event name */
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221 strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
222 lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89 223
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224 /* Init node */
225 hashtable_node_init(&lue->node, (void *) lue->attr.name,
226 strlen(lue->attr.name));
227 /* Alloc context hash tables */
e03e3332 228 lue->ctx = hashtable_new_str(0);
97ee3a89 229
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230 DBG2("Trace UST event %s created", lue->attr.name);
231
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232 return lue;
233
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234error_free_event:
235 free(lue);
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236error:
237 return NULL;
238}
239
240/*
241 * Allocate and initialize a ust metadata.
242 *
243 * Return pointer to structure or NULL.
244 */
245struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
246{
247 int ret;
248 struct ltt_ust_metadata *lum;
97ee3a89 249
3a009adb 250 lum = zmalloc(sizeof(struct ltt_ust_metadata));
44d3bd01 251 if (lum == NULL) {
ba7f0ae5 252 perror("ust metadata zmalloc");
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253 goto error;
254 }
255
256 /* Set default attributes */
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257 lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
258 lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
259 lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
260 lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
261 lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
d41f73b7 262 lum->attr.output = LTTNG_UST_MMAP;
44d3bd01 263
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264 lum->handle = -1;
265 /* Set metadata trace path */
f6a9efaa 266 ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path);
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267 if (ret < 0) {
268 perror("asprintf ust metadata");
44844c29 269 goto error_free_metadata;
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270 }
271
272 return lum;
273
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274error_free_metadata:
275 free(lum);
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276error:
277 return NULL;
278}
279
f6a9efaa
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280/*
281 * RCU safe free context structure.
282 */
283static void destroy_context_rcu(struct rcu_head *head)
284{
285 struct cds_lfht_node *node =
286 caa_container_of(head, struct cds_lfht_node, head);
287 struct ltt_ust_context *ctx =
288 caa_container_of(node, struct ltt_ust_context, node);
289
290 free(ctx);
291}
292
293/*
294 * Cleanup UST context hash table.
295 */
296static void destroy_context(struct cds_lfht *ht)
297{
298 int ret;
299 struct cds_lfht_node *node;
300 struct cds_lfht_iter iter;
301
ed52805d 302 cds_lfht_for_each(ht, &iter, node) {
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303 ret = hashtable_del(ht, &iter);
304 if (!ret) {
305 call_rcu(&node->head, destroy_context_rcu);
306 }
f6a9efaa 307 }
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308
309 hashtable_destroy(ht);
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310}
311
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312/*
313 * Cleanup ust event structure.
314 */
315void trace_ust_destroy_event(struct ltt_ust_event *event)
316{
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317 DBG2("Trace destroy UST event %s", event->attr.name);
318 destroy_context(event->ctx);
ed52805d 319
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320 free(event);
321}
322
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323/*
324 * URCU intermediate call to complete destroy event.
325 */
326static void destroy_event_rcu(struct rcu_head *head)
327{
328 struct cds_lfht_node *node =
329 caa_container_of(head, struct cds_lfht_node, head);
330 struct ltt_ust_event *event =
331 caa_container_of(node, struct ltt_ust_event, node);
332
333 trace_ust_destroy_event(event);
334}
335
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336/*
337 * Cleanup UST events hashtable.
338 */
339static void destroy_event(struct cds_lfht *events)
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340{
341 int ret;
342 struct cds_lfht_node *node;
343 struct cds_lfht_iter iter;
344
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345 cds_lfht_for_each(events, &iter, node) {
346 ret = hashtable_del(events, &iter);
ed52805d
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347 if (!ret) {
348 call_rcu(&node->head, destroy_event_rcu);
349 }
350 }
351
284d8f55 352 hashtable_destroy(events);
ed52805d
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353}
354
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355/*
356 * Cleanup ust channel structure.
357 */
358void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
359{
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360 int ret;
361 struct cds_lfht_node *node;
362 struct cds_lfht_iter iter;
97ee3a89 363
f6a9efaa 364 DBG2("Trace destroy UST channel %s", channel->name);
97ee3a89 365
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366 rcu_read_lock();
367
ed52805d 368 cds_lfht_for_each(channel->events, &iter, node) {
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369 ret = hashtable_del(channel->events, &iter);
370 if (!ret) {
ed52805d 371 destroy_event(channel->events);
f6a9efaa 372 }
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373 }
374
f6a9efaa 375 destroy_context(channel->ctx);
97ee3a89 376 free(channel);
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377
378 rcu_read_unlock();
379}
380
381/*
382 * URCU intermediate call to complete destroy channel.
383 */
384static void destroy_channel_rcu(struct rcu_head *head)
385{
386 struct cds_lfht_node *node =
387 caa_container_of(head, struct cds_lfht_node, head);
388 struct ltt_ust_channel *channel =
389 caa_container_of(node, struct ltt_ust_channel, node);
390
391 trace_ust_destroy_channel(channel);
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392}
393
394/*
395 * Cleanup ust metadata structure.
396 */
397void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
398{
f6a9efaa 399 DBG2("Trace UST destroy metadata %d", metadata->handle);
97ee3a89 400
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401 free(metadata);
402}
403
404/*
f6a9efaa 405 * Iterate over a hash table containing channels and cleanup safely.
97ee3a89 406 */
f6a9efaa
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407static void destroy_channels(struct cds_lfht *channels)
408{
409 int ret;
410 struct cds_lfht_node *node;
411 struct cds_lfht_iter iter;
412
ed52805d 413 cds_lfht_for_each(channels, &iter, node) {
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414 ret = hashtable_del(channels, &iter);
415 if (!ret) {
416 call_rcu(&node->head, destroy_channel_rcu);
417 }
f6a9efaa 418 }
ed52805d
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419
420 hashtable_destroy(channels);
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421}
422
423/*
424 * Cleanup UST pid domain.
425 */
426static void destroy_domain_pid(struct cds_lfht *ht)
427{
428 int ret;
f6a9efaa 429 struct cds_lfht_iter iter;
ed52805d 430 struct ltt_ust_domain_pid *dpid;
f6a9efaa 431
ed52805d 432 cds_lfht_for_each_entry(ht, &iter, dpid, node) {
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433 ret = hashtable_del(ht , &iter);
434 if (!ret) {
ed52805d 435 destroy_channels(dpid->channels);
f6a9efaa 436 }
f6a9efaa 437 }
ed52805d
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438
439 hashtable_destroy(ht);
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440}
441
442/*
443 * Cleanup UST exec name domain.
444 */
445static void destroy_domain_exec(struct cds_lfht *ht)
97ee3a89 446{
f6a9efaa 447 int ret;
f6a9efaa 448 struct cds_lfht_iter iter;
ed52805d 449 struct ltt_ust_domain_exec *dexec;
f6a9efaa 450
ed52805d 451 cds_lfht_for_each_entry(ht, &iter, dexec, node) {
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452 ret = hashtable_del(ht , &iter);
453 if (!ret) {
ed52805d 454 destroy_channels(dexec->channels);
f6a9efaa 455 }
f6a9efaa 456 }
ed52805d
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457
458 hashtable_destroy(ht);
f6a9efaa 459}
97ee3a89 460
f6a9efaa
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461/*
462 * Cleanup UST global domain.
463 */
464static void destroy_domain_global(struct ltt_ust_domain_global *dom)
465{
466 destroy_channels(dom->channels);
467}
97ee3a89 468
f6a9efaa
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469/*
470 * Cleanup ust session structure
471 */
472void trace_ust_destroy_session(struct ltt_ust_session *session)
473{
ed52805d 474 /* Extra protection */
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475 if (session == NULL) {
476 return;
477 }
478
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479 rcu_read_lock();
480
48842b30 481 DBG2("Trace UST destroy session %d", session->uid);
f6a9efaa 482
f6a9efaa
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483 /* Cleaning up UST domain */
484 destroy_domain_global(&session->domain_global);
485 destroy_domain_pid(session->domain_pid);
486 destroy_domain_exec(session->domain_exec);
44d3bd01 487
97ee3a89 488 free(session);
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489
490 rcu_read_unlock();
97ee3a89 491}
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