Multiple fixes when cleaning app and UST sessions
[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 */
94 lus = malloc(sizeof(struct ltt_ust_session));
95 if (lus == NULL) {
36dc12cc 96 PERROR("create ust session malloc");
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97 goto error;
98 }
99
100 /* Init data structure */
3bd1e081 101 lus->consumer_fds_sent = 0;
48842b30 102 lus->uid = uid;
36dc12cc 103 lus->start_trace = 0;
97ee3a89 104
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105 /* Alloc UST domain hash tables */
106 lus->domain_pid = hashtable_new(0);
107 lus->domain_exec = hashtable_new_str(0);
108
109 /* Alloc UST global domain channels' HT */
110 lus->domain_global.channels = hashtable_new_str(0);
44d3bd01 111
0177d773 112 /* Set session path */
48842b30 113 ret = snprintf(lus->pathname, PATH_MAX, "%s/ust", path);
0177d773 114 if (ret < 0) {
44d3bd01 115 PERROR("snprintf kernel traces path");
44844c29 116 goto error_free_session;
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117 }
118
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119 DBG2("UST trace session create successful");
120
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121 return lus;
122
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123error_free_session:
124 free(lus);
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125error:
126 return NULL;
127}
128
129/*
130 * Allocate and initialize a ust channel data structure.
131 *
132 * Return pointer to structure or NULL.
133 */
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134struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan,
135 char *path)
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136{
137 int ret;
138 struct ltt_ust_channel *luc;
139
140 luc = malloc(sizeof(struct ltt_ust_channel));
141 if (luc == NULL) {
142 perror("ltt_ust_channel malloc");
143 goto error;
144 }
145
44d3bd01 146 /* Copy UST channel attributes */
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147 luc->attr.overwrite = chan->attr.overwrite;
148 luc->attr.subbuf_size = chan->attr.subbuf_size;
149 luc->attr.num_subbuf = chan->attr.num_subbuf;
150 luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
151 luc->attr.read_timer_interval = chan->attr.read_timer_interval;
152 luc->attr.output = chan->attr.output;
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153
154 /* Translate to UST output enum */
155 switch (luc->attr.output) {
156 default:
157 luc->attr.output = LTTNG_UST_MMAP;
158 break;
97ee3a89 159 }
97ee3a89 160
97ee3a89 161 /* Copy channel name */
44d3bd01 162 strncpy(luc->name, chan->name, sizeof(&luc->name));
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163 luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
164
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165 /* Init node */
166 hashtable_node_init(&luc->node, (void *) luc->name, strlen(luc->name));
167 /* Alloc hash tables */
168 luc->events = hashtable_new_str(0);
169 luc->ctx = hashtable_new_str(0);
170
97ee3a89 171 /* Set trace output path */
48842b30 172 ret = snprintf(luc->pathname, PATH_MAX, "%s", path);
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173 if (ret < 0) {
174 perror("asprintf ust create channel");
44844c29 175 goto error_free_channel;
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176 }
177
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178 DBG2("Trace UST channel %s created", luc->name);
179
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180 return luc;
181
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182error_free_channel:
183 free(luc);
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184error:
185 return NULL;
186}
187
188/*
189 * Allocate and initialize a ust event. Set name and event type.
190 *
191 * Return pointer to structure or NULL.
192 */
193struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev)
194{
195 struct ltt_ust_event *lue;
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196
197 lue = malloc(sizeof(struct ltt_ust_event));
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198 if (lue == NULL) {
199 PERROR("ust event malloc");
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200 goto error;
201 }
202
203 switch (ev->type) {
204 case LTTNG_EVENT_PROBE:
44d3bd01 205 lue->attr.instrumentation = LTTNG_UST_PROBE;
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206 break;
207 case LTTNG_EVENT_FUNCTION:
44d3bd01 208 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
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209 break;
210 case LTTNG_EVENT_FUNCTION_ENTRY:
44d3bd01 211 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
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212 break;
213 case LTTNG_EVENT_TRACEPOINT:
44d3bd01 214 lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
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215 break;
216 default:
217 ERR("Unknown ust instrumentation type (%d)", ev->type);
44844c29 218 goto error_free_event;
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219 }
220
221 /* Copy event name */
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222 strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
223 lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89 224
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225 /* Init node */
226 hashtable_node_init(&lue->node, (void *) lue->attr.name,
227 strlen(lue->attr.name));
228 /* Alloc context hash tables */
e03e3332 229 lue->ctx = hashtable_new_str(0);
97ee3a89 230
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231 DBG2("Trace UST event %s created", lue->attr.name);
232
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233 return lue;
234
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235error_free_event:
236 free(lue);
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237error:
238 return NULL;
239}
240
241/*
242 * Allocate and initialize a ust metadata.
243 *
244 * Return pointer to structure or NULL.
245 */
246struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
247{
248 int ret;
249 struct ltt_ust_metadata *lum;
97ee3a89 250
3a009adb 251 lum = zmalloc(sizeof(struct ltt_ust_metadata));
44d3bd01 252 if (lum == NULL) {
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253 perror("ust metadata malloc");
254 goto error;
255 }
256
257 /* Set default attributes */
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258 lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
259 lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
260 lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
261 lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
262 lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
d41f73b7 263 lum->attr.output = LTTNG_UST_MMAP;
44d3bd01 264
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265 lum->handle = -1;
266 /* Set metadata trace path */
f6a9efaa 267 ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path);
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268 if (ret < 0) {
269 perror("asprintf ust metadata");
44844c29 270 goto error_free_metadata;
97ee3a89
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271 }
272
273 return lum;
274
44844c29
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275error_free_metadata:
276 free(lum);
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277error:
278 return NULL;
279}
280
f6a9efaa
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281/*
282 * RCU safe free context structure.
283 */
284static void destroy_context_rcu(struct rcu_head *head)
285{
286 struct cds_lfht_node *node =
287 caa_container_of(head, struct cds_lfht_node, head);
288 struct ltt_ust_context *ctx =
289 caa_container_of(node, struct ltt_ust_context, node);
290
291 free(ctx);
292}
293
294/*
295 * Cleanup UST context hash table.
296 */
297static void destroy_context(struct cds_lfht *ht)
298{
299 int ret;
300 struct cds_lfht_node *node;
301 struct cds_lfht_iter iter;
302
ed52805d 303 cds_lfht_for_each(ht, &iter, node) {
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304 ret = hashtable_del(ht, &iter);
305 if (!ret) {
306 call_rcu(&node->head, destroy_context_rcu);
307 }
f6a9efaa 308 }
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309
310 hashtable_destroy(ht);
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311}
312
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313/*
314 * Cleanup ust event structure.
315 */
316void trace_ust_destroy_event(struct ltt_ust_event *event)
317{
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318 DBG2("Trace destroy UST event %s", event->attr.name);
319 destroy_context(event->ctx);
ed52805d 320
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321 free(event);
322}
323
f6a9efaa
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324/*
325 * URCU intermediate call to complete destroy event.
326 */
327static void destroy_event_rcu(struct rcu_head *head)
328{
329 struct cds_lfht_node *node =
330 caa_container_of(head, struct cds_lfht_node, head);
331 struct ltt_ust_event *event =
332 caa_container_of(node, struct ltt_ust_event, node);
333
334 trace_ust_destroy_event(event);
335}
336
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337/*
338 * Cleanup UST events hashtable.
339 */
340static void destroy_event(struct cds_lfht *events)
ed52805d
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341{
342 int ret;
343 struct cds_lfht_node *node;
344 struct cds_lfht_iter iter;
345
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346 cds_lfht_for_each(events, &iter, node) {
347 ret = hashtable_del(events, &iter);
ed52805d
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348 if (!ret) {
349 call_rcu(&node->head, destroy_event_rcu);
350 }
351 }
352
284d8f55 353 hashtable_destroy(events);
ed52805d
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354}
355
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356/*
357 * Cleanup ust channel structure.
358 */
359void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
360{
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361 int ret;
362 struct cds_lfht_node *node;
363 struct cds_lfht_iter iter;
97ee3a89 364
f6a9efaa 365 DBG2("Trace destroy UST channel %s", channel->name);
97ee3a89 366
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367 rcu_read_lock();
368
ed52805d 369 cds_lfht_for_each(channel->events, &iter, node) {
f6a9efaa
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370 ret = hashtable_del(channel->events, &iter);
371 if (!ret) {
ed52805d 372 destroy_event(channel->events);
f6a9efaa 373 }
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374 }
375
f6a9efaa 376 destroy_context(channel->ctx);
97ee3a89 377 free(channel);
f6a9efaa
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378
379 rcu_read_unlock();
380}
381
382/*
383 * URCU intermediate call to complete destroy channel.
384 */
385static void destroy_channel_rcu(struct rcu_head *head)
386{
387 struct cds_lfht_node *node =
388 caa_container_of(head, struct cds_lfht_node, head);
389 struct ltt_ust_channel *channel =
390 caa_container_of(node, struct ltt_ust_channel, node);
391
392 trace_ust_destroy_channel(channel);
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393}
394
395/*
396 * Cleanup ust metadata structure.
397 */
398void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
399{
f6a9efaa 400 DBG2("Trace UST destroy metadata %d", metadata->handle);
97ee3a89 401
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402 free(metadata);
403}
404
405/*
f6a9efaa 406 * Iterate over a hash table containing channels and cleanup safely.
97ee3a89 407 */
f6a9efaa
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408static void destroy_channels(struct cds_lfht *channels)
409{
410 int ret;
411 struct cds_lfht_node *node;
412 struct cds_lfht_iter iter;
413
ed52805d 414 cds_lfht_for_each(channels, &iter, node) {
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415 ret = hashtable_del(channels, &iter);
416 if (!ret) {
417 call_rcu(&node->head, destroy_channel_rcu);
418 }
f6a9efaa 419 }
ed52805d
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420
421 hashtable_destroy(channels);
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422}
423
424/*
425 * Cleanup UST pid domain.
426 */
427static void destroy_domain_pid(struct cds_lfht *ht)
428{
429 int ret;
f6a9efaa 430 struct cds_lfht_iter iter;
ed52805d 431 struct ltt_ust_domain_pid *dpid;
f6a9efaa 432
ed52805d 433 cds_lfht_for_each_entry(ht, &iter, dpid, node) {
f6a9efaa
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434 ret = hashtable_del(ht , &iter);
435 if (!ret) {
ed52805d 436 destroy_channels(dpid->channels);
f6a9efaa 437 }
f6a9efaa 438 }
ed52805d
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439
440 hashtable_destroy(ht);
f6a9efaa
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441}
442
443/*
444 * Cleanup UST exec name domain.
445 */
446static void destroy_domain_exec(struct cds_lfht *ht)
97ee3a89 447{
f6a9efaa 448 int ret;
f6a9efaa 449 struct cds_lfht_iter iter;
ed52805d 450 struct ltt_ust_domain_exec *dexec;
f6a9efaa 451
ed52805d 452 cds_lfht_for_each_entry(ht, &iter, dexec, node) {
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453 ret = hashtable_del(ht , &iter);
454 if (!ret) {
ed52805d 455 destroy_channels(dexec->channels);
f6a9efaa 456 }
f6a9efaa 457 }
ed52805d
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458
459 hashtable_destroy(ht);
f6a9efaa 460}
97ee3a89 461
f6a9efaa
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462/*
463 * Cleanup UST global domain.
464 */
465static void destroy_domain_global(struct ltt_ust_domain_global *dom)
466{
467 destroy_channels(dom->channels);
468}
97ee3a89 469
f6a9efaa
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470/*
471 * Cleanup ust session structure
472 */
473void trace_ust_destroy_session(struct ltt_ust_session *session)
474{
ed52805d 475 /* Extra protection */
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476 if (session == NULL) {
477 return;
478 }
479
f6a9efaa
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480 rcu_read_lock();
481
48842b30 482 DBG2("Trace UST destroy session %d", session->uid);
f6a9efaa 483
f6a9efaa
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484 /* Cleaning up UST domain */
485 destroy_domain_global(&session->domain_global);
486 destroy_domain_pid(session->domain_pid);
487 destroy_domain_exec(session->domain_exec);
44d3bd01 488
97ee3a89 489 free(session);
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490
491 rcu_read_unlock();
97ee3a89 492}
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