Fix wrong return value on consumer socket creation
[lttng-tools.git] / src / bin / lttng-sessiond / trace-ust.c
CommitLineData
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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
990570ed
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24#include <common/common.h>
25#include <common/defaults.h>
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26
27#include "trace-ust.h"
28
0177d773 29/*
f6a9efaa 30 * Find the channel in the hashtable.
0177d773 31 */
bec39940 32struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
f6a9efaa 33 char *name)
0177d773 34{
bec39940
DG
35 struct lttng_ht_node_str *node;
36 struct lttng_ht_iter iter;
0177d773 37
f6a9efaa 38 rcu_read_lock();
bec39940
DG
39 lttng_ht_lookup(ht, (void *)name, &iter);
40 node = lttng_ht_iter_get_node_str(&iter);
f6a9efaa
DG
41 if (node == NULL) {
42 rcu_read_unlock();
44d3bd01
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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 */
bec39940 59struct ltt_ust_event *trace_ust_find_event_by_name(struct lttng_ht *ht,
f6a9efaa 60 char *name)
97ee3a89 61{
bec39940
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62 struct lttng_ht_node_str *node;
63 struct lttng_ht_iter iter;
97ee3a89 64
f6a9efaa 65 rcu_read_lock();
bec39940
DG
66 lttng_ht_lookup(ht, (void *) name, &iter);
67 node = lttng_ht_iter_get_node_str(&iter);
f6a9efaa
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68 if (node == NULL) {
69 rcu_read_unlock();
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70 goto error;
71 }
f6a9efaa 72 rcu_read_unlock();
97ee3a89 73
284d8f55 74 DBG2("Trace UST event found by name %s", name);
f6a9efaa
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75
76 return caa_container_of(node, struct ltt_ust_event, node);
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77
78error:
284d8f55 79 DBG2("Trace UST event NOT found by name %s", name);
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80 return NULL;
81}
82
83/*
84 * Allocate and initialize a ust session data structure.
85 *
86 * Return pointer to structure or NULL.
87 */
a991f516 88struct ltt_ust_session *trace_ust_create_session(char *path, int session_id,
44d3bd01 89 struct lttng_domain *domain)
97ee3a89 90{
0177d773 91 int ret;
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92 struct ltt_ust_session *lus;
93
94 /* Allocate a new ltt ust session */
ba7f0ae5 95 lus = zmalloc(sizeof(struct ltt_ust_session));
97ee3a89 96 if (lus == NULL) {
ba7f0ae5 97 PERROR("create ust session zmalloc");
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98 goto error;
99 }
100
101 /* Init data structure */
a991f516 102 lus->id = session_id;
36dc12cc 103 lus->start_trace = 0;
97ee3a89 104
f6a9efaa 105 /* Alloc UST domain hash tables */
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106 lus->domain_pid = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
107 lus->domain_exec = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
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108
109 /* Alloc UST global domain channels' HT */
bec39940 110 lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
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;
0177d773
DG
117 }
118
44d3bd01
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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 */
44d3bd01
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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
37357452 140 luc = zmalloc(sizeof(struct ltt_ust_channel));
97ee3a89 141 if (luc == NULL) {
df0f840b 142 PERROR("ltt_ust_channel zmalloc");
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143 goto error;
144 }
145
44d3bd01 146 /* Copy UST channel attributes */
48842b30
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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;
44d3bd01
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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 */
0a1459bb 162 strncpy(luc->name, chan->name, sizeof(luc->name));
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163 luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
164
f6a9efaa 165 /* Init node */
bec39940 166 lttng_ht_node_init_str(&luc->node, luc->name);
f6a9efaa 167 /* Alloc hash tables */
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168 luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
169 luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
f6a9efaa 170
97ee3a89 171 /* Set trace output path */
48842b30 172 ret = snprintf(luc->pathname, PATH_MAX, "%s", path);
97ee3a89 173 if (ret < 0) {
df0f840b 174 PERROR("asprintf ust create channel");
44844c29 175 goto error_free_channel;
97ee3a89
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176 }
177
f6a9efaa
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178 DBG2("Trace UST channel %s created", luc->name);
179
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180 return luc;
181
44844c29
MD
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;
97ee3a89 196
37357452 197 lue = zmalloc(sizeof(struct ltt_ust_event));
44d3bd01 198 if (lue == NULL) {
ba7f0ae5 199 PERROR("ust event zmalloc");
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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;
97ee3a89
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219 }
220
221 /* Copy event name */
44d3bd01
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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
0cda4f28 225 switch (ev->loglevel_type) {
8005f29a
MD
226 case LTTNG_EVENT_LOGLEVEL_ALL:
227 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_ALL;
22e25b71 228 lue->attr.loglevel = -1; /* Force to -1 */
0cda4f28 229 break;
8005f29a
MD
230 case LTTNG_EVENT_LOGLEVEL_RANGE:
231 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_RANGE;
22e25b71 232 lue->attr.loglevel = ev->loglevel;
8005f29a
MD
233 break;
234 case LTTNG_EVENT_LOGLEVEL_SINGLE:
235 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE;
22e25b71 236 lue->attr.loglevel = ev->loglevel;
0cda4f28
MD
237 break;
238 default:
4431494b 239 ERR("Unknown ust loglevel type (%d)", ev->loglevel_type);
0cda4f28
MD
240 goto error_free_event;
241 }
242
0cda4f28 243
f6a9efaa 244 /* Init node */
bec39940 245 lttng_ht_node_init_str(&lue->node, lue->attr.name);
f6a9efaa 246 /* Alloc context hash tables */
bec39940 247 lue->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
97ee3a89 248
300b8fd5
MD
249 DBG2("Trace UST event %s, loglevel (%d,%d) created",
250 lue->attr.name, lue->attr.loglevel_type,
251 lue->attr.loglevel);
284d8f55 252
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253 return lue;
254
44844c29
MD
255error_free_event:
256 free(lue);
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257error:
258 return NULL;
259}
260
261/*
262 * Allocate and initialize a ust metadata.
263 *
264 * Return pointer to structure or NULL.
265 */
266struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
267{
268 int ret;
269 struct ltt_ust_metadata *lum;
97ee3a89 270
3a009adb 271 lum = zmalloc(sizeof(struct ltt_ust_metadata));
44d3bd01 272 if (lum == NULL) {
df0f840b 273 PERROR("ust metadata zmalloc");
97ee3a89
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274 goto error;
275 }
276
277 /* Set default attributes */
44d3bd01
DG
278 lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
279 lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
280 lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
281 lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
282 lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
d41f73b7 283 lum->attr.output = LTTNG_UST_MMAP;
44d3bd01 284
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285 lum->handle = -1;
286 /* Set metadata trace path */
f6a9efaa 287 ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path);
97ee3a89 288 if (ret < 0) {
df0f840b 289 PERROR("asprintf ust metadata");
44844c29 290 goto error_free_metadata;
97ee3a89
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291 }
292
293 return lum;
294
44844c29
MD
295error_free_metadata:
296 free(lum);
97ee3a89
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297error:
298 return NULL;
299}
300
55cc08a6
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301/*
302 * Allocate and initialize an UST context.
303 *
304 * Return pointer to structure or NULL.
305 */
306struct ltt_ust_context *trace_ust_create_context(
307 struct lttng_event_context *ctx)
308{
309 struct ltt_ust_context *uctx;
9197c5c4
MD
310 enum lttng_ust_context_type utype;
311
312 switch (ctx->ctx) {
313 case LTTNG_EVENT_CONTEXT_VTID:
314 utype = LTTNG_UST_CONTEXT_VTID;
315 break;
316 case LTTNG_EVENT_CONTEXT_VPID:
317 utype = LTTNG_UST_CONTEXT_VPID;
318 break;
319 case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
320 utype = LTTNG_UST_CONTEXT_PTHREAD_ID;
321 break;
322 case LTTNG_EVENT_CONTEXT_PROCNAME:
323 utype = LTTNG_UST_CONTEXT_PROCNAME;
324 break;
325 default:
326 ERR("Invalid UST context");
327 return NULL;
328 }
55cc08a6
DG
329
330 uctx = zmalloc(sizeof(struct ltt_ust_context));
331 if (uctx == NULL) {
332 PERROR("zmalloc ltt_ust_context");
333 goto error;
334 }
335
9197c5c4 336 uctx->ctx.ctx = utype;
bec39940 337 lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx);
55cc08a6
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338
339 return uctx;
340
341error:
342 return NULL;
343}
344
f6a9efaa
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345/*
346 * RCU safe free context structure.
347 */
348static void destroy_context_rcu(struct rcu_head *head)
349{
bec39940
DG
350 struct lttng_ht_node_ulong *node =
351 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa
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352 struct ltt_ust_context *ctx =
353 caa_container_of(node, struct ltt_ust_context, node);
354
355 free(ctx);
356}
357
358/*
359 * Cleanup UST context hash table.
360 */
7bd39047 361static void destroy_contexts(struct lttng_ht *ht)
f6a9efaa
DG
362{
363 int ret;
bec39940
DG
364 struct lttng_ht_node_ulong *node;
365 struct lttng_ht_iter iter;
f6a9efaa 366
bec39940
DG
367 cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) {
368 ret = lttng_ht_del(ht, &iter);
f6a9efaa
DG
369 if (!ret) {
370 call_rcu(&node->head, destroy_context_rcu);
371 }
f6a9efaa 372 }
ed52805d 373
bec39940 374 lttng_ht_destroy(ht);
f6a9efaa
DG
375}
376
97ee3a89
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377/*
378 * Cleanup ust event structure.
379 */
380void trace_ust_destroy_event(struct ltt_ust_event *event)
381{
f6a9efaa 382 DBG2("Trace destroy UST event %s", event->attr.name);
7bd39047 383 destroy_contexts(event->ctx);
ed52805d 384
97ee3a89
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385 free(event);
386}
387
f6a9efaa
DG
388/*
389 * URCU intermediate call to complete destroy event.
390 */
391static void destroy_event_rcu(struct rcu_head *head)
392{
bec39940
DG
393 struct lttng_ht_node_str *node =
394 caa_container_of(head, struct lttng_ht_node_str, head);
f6a9efaa
DG
395 struct ltt_ust_event *event =
396 caa_container_of(node, struct ltt_ust_event, node);
397
398 trace_ust_destroy_event(event);
399}
400
284d8f55
DG
401/*
402 * Cleanup UST events hashtable.
403 */
7bd39047 404static void destroy_events(struct lttng_ht *events)
ed52805d
DG
405{
406 int ret;
bec39940
DG
407 struct lttng_ht_node_str *node;
408 struct lttng_ht_iter iter;
ed52805d 409
bec39940
DG
410 cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
411 ret = lttng_ht_del(events, &iter);
7bd39047
DG
412 assert(!ret);
413 call_rcu(&node->head, destroy_event_rcu);
ed52805d
DG
414 }
415
bec39940 416 lttng_ht_destroy(events);
ed52805d
DG
417}
418
97ee3a89
DG
419/*
420 * Cleanup ust channel structure.
421 */
422void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
423{
f6a9efaa 424 DBG2("Trace destroy UST channel %s", channel->name);
97ee3a89 425
f6a9efaa
DG
426 rcu_read_lock();
427
7bd39047
DG
428 /* Destroying all events of the channel */
429 destroy_events(channel->events);
430 /* Destroying all context of the channel */
431 destroy_contexts(channel->ctx);
97ee3a89 432
97ee3a89 433 free(channel);
f6a9efaa
DG
434
435 rcu_read_unlock();
436}
437
438/*
439 * URCU intermediate call to complete destroy channel.
440 */
441static void destroy_channel_rcu(struct rcu_head *head)
442{
bec39940
DG
443 struct lttng_ht_node_str *node =
444 caa_container_of(head, struct lttng_ht_node_str, head);
f6a9efaa
DG
445 struct ltt_ust_channel *channel =
446 caa_container_of(node, struct ltt_ust_channel, node);
447
448 trace_ust_destroy_channel(channel);
97ee3a89
DG
449}
450
451/*
452 * Cleanup ust metadata structure.
453 */
454void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
455{
f6a9efaa 456 DBG2("Trace UST destroy metadata %d", metadata->handle);
97ee3a89 457
97ee3a89
DG
458 free(metadata);
459}
460
461/*
f6a9efaa 462 * Iterate over a hash table containing channels and cleanup safely.
97ee3a89 463 */
bec39940 464static void destroy_channels(struct lttng_ht *channels)
f6a9efaa
DG
465{
466 int ret;
bec39940
DG
467 struct lttng_ht_node_str *node;
468 struct lttng_ht_iter iter;
f6a9efaa 469
24d1723f
DG
470 rcu_read_lock();
471
bec39940
DG
472 cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) {
473 ret = lttng_ht_del(channels, &iter);
7bd39047
DG
474 assert(!ret);
475 call_rcu(&node->head, destroy_channel_rcu);
f6a9efaa 476 }
ed52805d 477
bec39940 478 lttng_ht_destroy(channels);
24d1723f
DG
479
480 rcu_read_unlock();
f6a9efaa
DG
481}
482
483/*
484 * Cleanup UST pid domain.
485 */
bec39940 486static void destroy_domain_pid(struct lttng_ht *ht)
f6a9efaa
DG
487{
488 int ret;
bec39940 489 struct lttng_ht_iter iter;
ed52805d 490 struct ltt_ust_domain_pid *dpid;
f6a9efaa 491
bec39940
DG
492 cds_lfht_for_each_entry(ht->ht, &iter.iter, dpid, node.node) {
493 ret = lttng_ht_del(ht , &iter);
7bd39047
DG
494 assert(!ret);
495 destroy_channels(dpid->channels);
f6a9efaa 496 }
ed52805d 497
bec39940 498 lttng_ht_destroy(ht);
f6a9efaa
DG
499}
500
501/*
502 * Cleanup UST exec name domain.
503 */
bec39940 504static void destroy_domain_exec(struct lttng_ht *ht)
97ee3a89 505{
f6a9efaa 506 int ret;
bec39940 507 struct lttng_ht_iter iter;
ed52805d 508 struct ltt_ust_domain_exec *dexec;
f6a9efaa 509
bec39940
DG
510 cds_lfht_for_each_entry(ht->ht, &iter.iter, dexec, node.node) {
511 ret = lttng_ht_del(ht , &iter);
7bd39047
DG
512 assert(!ret);
513 destroy_channels(dexec->channels);
f6a9efaa 514 }
ed52805d 515
bec39940 516 lttng_ht_destroy(ht);
f6a9efaa 517}
97ee3a89 518
f6a9efaa
DG
519/*
520 * Cleanup UST global domain.
521 */
522static void destroy_domain_global(struct ltt_ust_domain_global *dom)
523{
524 destroy_channels(dom->channels);
525}
97ee3a89 526
f6a9efaa
DG
527/*
528 * Cleanup ust session structure
529 */
530void trace_ust_destroy_session(struct ltt_ust_session *session)
531{
ed52805d 532 /* Extra protection */
97ee3a89
DG
533 if (session == NULL) {
534 return;
535 }
536
f6a9efaa
DG
537 rcu_read_lock();
538
a991f516 539 DBG2("Trace UST destroy session %d", session->id);
f6a9efaa 540
f6a9efaa
DG
541 /* Cleaning up UST domain */
542 destroy_domain_global(&session->domain_global);
543 destroy_domain_pid(session->domain_pid);
544 destroy_domain_exec(session->domain_exec);
44d3bd01 545
97ee3a89 546 free(session);
f6a9efaa
DG
547
548 rcu_read_unlock();
97ee3a89 549}
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