Fix: return value signedness
[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 *
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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.
97ee3a89 7 *
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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.
97ee3a89 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>
22#include <unistd.h>
23
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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
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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
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66 lttng_ht_lookup(ht, (void *) name, &iter);
67 node = lttng_ht_iter_get_node_str(&iter);
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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);
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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 */
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88struct ltt_ust_session *trace_ust_create_session(char *path,
89 unsigned int session_id, 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
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119 DBG2("UST trace session create successful");
120
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121 return lus;
122
44844c29 123error_free_session:
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124 lttng_ht_destroy(lus->domain_global.channels);
125 lttng_ht_destroy(lus->domain_exec);
126 lttng_ht_destroy(lus->domain_pid);
44844c29 127 free(lus);
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128error:
129 return NULL;
130}
131
132/*
133 * Allocate and initialize a ust channel data structure.
134 *
135 * Return pointer to structure or NULL.
136 */
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137struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan,
138 char *path)
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139{
140 int ret;
141 struct ltt_ust_channel *luc;
142
37357452 143 luc = zmalloc(sizeof(struct ltt_ust_channel));
97ee3a89 144 if (luc == NULL) {
df0f840b 145 PERROR("ltt_ust_channel zmalloc");
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146 goto error;
147 }
148
44d3bd01 149 /* Copy UST channel attributes */
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150 luc->attr.overwrite = chan->attr.overwrite;
151 luc->attr.subbuf_size = chan->attr.subbuf_size;
152 luc->attr.num_subbuf = chan->attr.num_subbuf;
153 luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
154 luc->attr.read_timer_interval = chan->attr.read_timer_interval;
155 luc->attr.output = chan->attr.output;
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156
157 /* Translate to UST output enum */
158 switch (luc->attr.output) {
159 default:
160 luc->attr.output = LTTNG_UST_MMAP;
161 break;
97ee3a89 162 }
97ee3a89 163
97ee3a89 164 /* Copy channel name */
0a1459bb 165 strncpy(luc->name, chan->name, sizeof(luc->name));
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166 luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
167
f6a9efaa 168 /* Init node */
bec39940 169 lttng_ht_node_init_str(&luc->node, luc->name);
f6a9efaa 170 /* Alloc hash tables */
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171 luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
172 luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
f6a9efaa 173
97ee3a89 174 /* Set trace output path */
48842b30 175 ret = snprintf(luc->pathname, PATH_MAX, "%s", path);
97ee3a89 176 if (ret < 0) {
df0f840b 177 PERROR("asprintf ust create channel");
44844c29 178 goto error_free_channel;
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179 }
180
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181 DBG2("Trace UST channel %s created", luc->name);
182
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183 return luc;
184
44844c29 185error_free_channel:
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MD
186 lttng_ht_destroy(luc->ctx);
187 lttng_ht_destroy(luc->events);
44844c29 188 free(luc);
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189error:
190 return NULL;
191}
192
193/*
194 * Allocate and initialize a ust event. Set name and event type.
195 *
196 * Return pointer to structure or NULL.
197 */
198struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev)
199{
200 struct ltt_ust_event *lue;
97ee3a89 201
37357452 202 lue = zmalloc(sizeof(struct ltt_ust_event));
44d3bd01 203 if (lue == NULL) {
ba7f0ae5 204 PERROR("ust event zmalloc");
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205 goto error;
206 }
207
208 switch (ev->type) {
209 case LTTNG_EVENT_PROBE:
44d3bd01 210 lue->attr.instrumentation = LTTNG_UST_PROBE;
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211 break;
212 case LTTNG_EVENT_FUNCTION:
44d3bd01 213 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
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214 break;
215 case LTTNG_EVENT_FUNCTION_ENTRY:
44d3bd01 216 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
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217 break;
218 case LTTNG_EVENT_TRACEPOINT:
44d3bd01 219 lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
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220 break;
221 default:
222 ERR("Unknown ust instrumentation type (%d)", ev->type);
44844c29 223 goto error_free_event;
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224 }
225
226 /* Copy event name */
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227 strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
228 lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89 229
0cda4f28 230 switch (ev->loglevel_type) {
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MD
231 case LTTNG_EVENT_LOGLEVEL_ALL:
232 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_ALL;
22e25b71 233 lue->attr.loglevel = -1; /* Force to -1 */
0cda4f28 234 break;
8005f29a
MD
235 case LTTNG_EVENT_LOGLEVEL_RANGE:
236 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_RANGE;
22e25b71 237 lue->attr.loglevel = ev->loglevel;
8005f29a
MD
238 break;
239 case LTTNG_EVENT_LOGLEVEL_SINGLE:
240 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE;
22e25b71 241 lue->attr.loglevel = ev->loglevel;
0cda4f28
MD
242 break;
243 default:
4431494b 244 ERR("Unknown ust loglevel type (%d)", ev->loglevel_type);
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MD
245 goto error_free_event;
246 }
247
0cda4f28 248
f6a9efaa 249 /* Init node */
bec39940 250 lttng_ht_node_init_str(&lue->node, lue->attr.name);
f6a9efaa 251 /* Alloc context hash tables */
bec39940 252 lue->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
97ee3a89 253
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MD
254 DBG2("Trace UST event %s, loglevel (%d,%d) created",
255 lue->attr.name, lue->attr.loglevel_type,
256 lue->attr.loglevel);
284d8f55 257
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258 return lue;
259
44844c29 260error_free_event:
a2c0da86 261 lttng_ht_destroy(lue->ctx);
44844c29 262 free(lue);
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263error:
264 return NULL;
265}
266
267/*
268 * Allocate and initialize a ust metadata.
269 *
270 * Return pointer to structure or NULL.
271 */
272struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
273{
274 int ret;
275 struct ltt_ust_metadata *lum;
97ee3a89 276
3a009adb 277 lum = zmalloc(sizeof(struct ltt_ust_metadata));
44d3bd01 278 if (lum == NULL) {
df0f840b 279 PERROR("ust metadata zmalloc");
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280 goto error;
281 }
282
283 /* Set default attributes */
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284 lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
285 lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
286 lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
287 lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
288 lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
d41f73b7 289 lum->attr.output = LTTNG_UST_MMAP;
44d3bd01 290
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291 lum->handle = -1;
292 /* Set metadata trace path */
f6a9efaa 293 ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path);
97ee3a89 294 if (ret < 0) {
df0f840b 295 PERROR("asprintf ust metadata");
44844c29 296 goto error_free_metadata;
97ee3a89
DG
297 }
298
299 return lum;
300
44844c29
MD
301error_free_metadata:
302 free(lum);
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303error:
304 return NULL;
305}
306
55cc08a6
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307/*
308 * Allocate and initialize an UST context.
309 *
310 * Return pointer to structure or NULL.
311 */
312struct ltt_ust_context *trace_ust_create_context(
313 struct lttng_event_context *ctx)
314{
315 struct ltt_ust_context *uctx;
9197c5c4
MD
316 enum lttng_ust_context_type utype;
317
318 switch (ctx->ctx) {
319 case LTTNG_EVENT_CONTEXT_VTID:
320 utype = LTTNG_UST_CONTEXT_VTID;
321 break;
322 case LTTNG_EVENT_CONTEXT_VPID:
323 utype = LTTNG_UST_CONTEXT_VPID;
324 break;
325 case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
326 utype = LTTNG_UST_CONTEXT_PTHREAD_ID;
327 break;
328 case LTTNG_EVENT_CONTEXT_PROCNAME:
329 utype = LTTNG_UST_CONTEXT_PROCNAME;
330 break;
331 default:
332 ERR("Invalid UST context");
333 return NULL;
334 }
55cc08a6
DG
335
336 uctx = zmalloc(sizeof(struct ltt_ust_context));
337 if (uctx == NULL) {
338 PERROR("zmalloc ltt_ust_context");
339 goto error;
340 }
341
9197c5c4 342 uctx->ctx.ctx = utype;
bec39940 343 lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx);
55cc08a6
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344
345 return uctx;
346
347error:
348 return NULL;
349}
350
f6a9efaa
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351/*
352 * RCU safe free context structure.
353 */
354static void destroy_context_rcu(struct rcu_head *head)
355{
bec39940
DG
356 struct lttng_ht_node_ulong *node =
357 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa
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358 struct ltt_ust_context *ctx =
359 caa_container_of(node, struct ltt_ust_context, node);
360
361 free(ctx);
362}
363
364/*
365 * Cleanup UST context hash table.
366 */
7bd39047 367static void destroy_contexts(struct lttng_ht *ht)
f6a9efaa
DG
368{
369 int ret;
bec39940
DG
370 struct lttng_ht_node_ulong *node;
371 struct lttng_ht_iter iter;
f6a9efaa 372
bec39940
DG
373 cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) {
374 ret = lttng_ht_del(ht, &iter);
f6a9efaa
DG
375 if (!ret) {
376 call_rcu(&node->head, destroy_context_rcu);
377 }
f6a9efaa 378 }
ed52805d 379
bec39940 380 lttng_ht_destroy(ht);
f6a9efaa
DG
381}
382
97ee3a89
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383/*
384 * Cleanup ust event structure.
385 */
386void trace_ust_destroy_event(struct ltt_ust_event *event)
387{
f6a9efaa 388 DBG2("Trace destroy UST event %s", event->attr.name);
7bd39047 389 destroy_contexts(event->ctx);
ed52805d 390
97ee3a89
DG
391 free(event);
392}
393
f6a9efaa
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394/*
395 * URCU intermediate call to complete destroy event.
396 */
397static void destroy_event_rcu(struct rcu_head *head)
398{
bec39940
DG
399 struct lttng_ht_node_str *node =
400 caa_container_of(head, struct lttng_ht_node_str, head);
f6a9efaa
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401 struct ltt_ust_event *event =
402 caa_container_of(node, struct ltt_ust_event, node);
403
404 trace_ust_destroy_event(event);
405}
406
284d8f55
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407/*
408 * Cleanup UST events hashtable.
409 */
7bd39047 410static void destroy_events(struct lttng_ht *events)
ed52805d
DG
411{
412 int ret;
bec39940
DG
413 struct lttng_ht_node_str *node;
414 struct lttng_ht_iter iter;
ed52805d 415
bec39940
DG
416 cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
417 ret = lttng_ht_del(events, &iter);
7bd39047
DG
418 assert(!ret);
419 call_rcu(&node->head, destroy_event_rcu);
ed52805d
DG
420 }
421
bec39940 422 lttng_ht_destroy(events);
ed52805d
DG
423}
424
97ee3a89
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425/*
426 * Cleanup ust channel structure.
427 */
428void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
429{
f6a9efaa 430 DBG2("Trace destroy UST channel %s", channel->name);
97ee3a89 431
f6a9efaa
DG
432 rcu_read_lock();
433
7bd39047
DG
434 /* Destroying all events of the channel */
435 destroy_events(channel->events);
436 /* Destroying all context of the channel */
437 destroy_contexts(channel->ctx);
97ee3a89 438
97ee3a89 439 free(channel);
f6a9efaa
DG
440
441 rcu_read_unlock();
442}
443
444/*
445 * URCU intermediate call to complete destroy channel.
446 */
447static void destroy_channel_rcu(struct rcu_head *head)
448{
bec39940
DG
449 struct lttng_ht_node_str *node =
450 caa_container_of(head, struct lttng_ht_node_str, head);
f6a9efaa
DG
451 struct ltt_ust_channel *channel =
452 caa_container_of(node, struct ltt_ust_channel, node);
453
454 trace_ust_destroy_channel(channel);
97ee3a89
DG
455}
456
457/*
458 * Cleanup ust metadata structure.
459 */
460void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
461{
abc9138a
MD
462 if (!metadata->handle) {
463 return;
464 }
f6a9efaa 465 DBG2("Trace UST destroy metadata %d", metadata->handle);
97ee3a89
DG
466 free(metadata);
467}
468
469/*
f6a9efaa 470 * Iterate over a hash table containing channels and cleanup safely.
97ee3a89 471 */
bec39940 472static void destroy_channels(struct lttng_ht *channels)
f6a9efaa
DG
473{
474 int ret;
bec39940
DG
475 struct lttng_ht_node_str *node;
476 struct lttng_ht_iter iter;
f6a9efaa 477
24d1723f
DG
478 rcu_read_lock();
479
bec39940
DG
480 cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) {
481 ret = lttng_ht_del(channels, &iter);
7bd39047
DG
482 assert(!ret);
483 call_rcu(&node->head, destroy_channel_rcu);
f6a9efaa 484 }
ed52805d 485
bec39940 486 lttng_ht_destroy(channels);
24d1723f
DG
487
488 rcu_read_unlock();
f6a9efaa
DG
489}
490
491/*
492 * Cleanup UST pid domain.
493 */
bec39940 494static void destroy_domain_pid(struct lttng_ht *ht)
f6a9efaa
DG
495{
496 int ret;
bec39940 497 struct lttng_ht_iter iter;
ed52805d 498 struct ltt_ust_domain_pid *dpid;
f6a9efaa 499
bec39940
DG
500 cds_lfht_for_each_entry(ht->ht, &iter.iter, dpid, node.node) {
501 ret = lttng_ht_del(ht , &iter);
7bd39047
DG
502 assert(!ret);
503 destroy_channels(dpid->channels);
f6a9efaa 504 }
ed52805d 505
bec39940 506 lttng_ht_destroy(ht);
f6a9efaa
DG
507}
508
509/*
510 * Cleanup UST exec name domain.
511 */
bec39940 512static void destroy_domain_exec(struct lttng_ht *ht)
97ee3a89 513{
f6a9efaa 514 int ret;
bec39940 515 struct lttng_ht_iter iter;
ed52805d 516 struct ltt_ust_domain_exec *dexec;
f6a9efaa 517
bec39940
DG
518 cds_lfht_for_each_entry(ht->ht, &iter.iter, dexec, node.node) {
519 ret = lttng_ht_del(ht , &iter);
7bd39047
DG
520 assert(!ret);
521 destroy_channels(dexec->channels);
f6a9efaa 522 }
ed52805d 523
bec39940 524 lttng_ht_destroy(ht);
f6a9efaa 525}
97ee3a89 526
f6a9efaa
DG
527/*
528 * Cleanup UST global domain.
529 */
530static void destroy_domain_global(struct ltt_ust_domain_global *dom)
531{
532 destroy_channels(dom->channels);
533}
97ee3a89 534
f6a9efaa
DG
535/*
536 * Cleanup ust session structure
537 */
538void trace_ust_destroy_session(struct ltt_ust_session *session)
539{
ed52805d 540 /* Extra protection */
97ee3a89
DG
541 if (session == NULL) {
542 return;
543 }
544
f6a9efaa
DG
545 rcu_read_lock();
546
fc4705fe 547 DBG2("Trace UST destroy session %u", session->id);
f6a9efaa 548
f6a9efaa
DG
549 /* Cleaning up UST domain */
550 destroy_domain_global(&session->domain_global);
551 destroy_domain_pid(session->domain_pid);
552 destroy_domain_exec(session->domain_exec);
44d3bd01 553
97ee3a89 554 free(session);
f6a9efaa
DG
555
556 rcu_read_unlock();
97ee3a89 557}
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