Add CMD_WARNING error code
[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
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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{
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35 struct lttng_ht_node_str *node;
36 struct lttng_ht_iter iter;
0177d773 37
f6a9efaa 38 rcu_read_lock();
bec39940
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39 lttng_ht_lookup(ht, (void *)name, &iter);
40 node = lttng_ht_iter_get_node_str(&iter);
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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 */
bec39940 59struct ltt_ust_event *trace_ust_find_event_by_name(struct lttng_ht *ht,
f6a9efaa 60 char *name)
97ee3a89 61{
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62 struct lttng_ht_node_str *node;
63 struct lttng_ht_iter iter;
97ee3a89 64
f6a9efaa 65 rcu_read_lock();
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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 */
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;
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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
37357452 140 luc = zmalloc(sizeof(struct ltt_ust_channel));
97ee3a89 141 if (luc == NULL) {
ba7f0ae5 142 perror("ltt_ust_channel zmalloc");
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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 */
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);
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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;
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;
97ee3a89 215 break;
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216 case LTTNG_EVENT_TRACEPOINT_LOGLEVEL:
217 lue->attr.instrumentation = LTTNG_UST_TRACEPOINT_LOGLEVEL;
218 break;
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219 default:
220 ERR("Unknown ust instrumentation type (%d)", ev->type);
44844c29 221 goto error_free_event;
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222 }
223
224 /* Copy event name */
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225 strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
226 lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89 227
f6a9efaa 228 /* Init node */
bec39940 229 lttng_ht_node_init_str(&lue->node, lue->attr.name);
f6a9efaa 230 /* Alloc context hash tables */
bec39940 231 lue->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
97ee3a89 232
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233 DBG2("Trace UST event %s created", lue->attr.name);
234
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235 return lue;
236
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237error_free_event:
238 free(lue);
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239error:
240 return NULL;
241}
242
243/*
244 * Allocate and initialize a ust metadata.
245 *
246 * Return pointer to structure or NULL.
247 */
248struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
249{
250 int ret;
251 struct ltt_ust_metadata *lum;
97ee3a89 252
3a009adb 253 lum = zmalloc(sizeof(struct ltt_ust_metadata));
44d3bd01 254 if (lum == NULL) {
ba7f0ae5 255 perror("ust metadata zmalloc");
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256 goto error;
257 }
258
259 /* Set default attributes */
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260 lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
261 lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
262 lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
263 lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
264 lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
d41f73b7 265 lum->attr.output = LTTNG_UST_MMAP;
44d3bd01 266
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267 lum->handle = -1;
268 /* Set metadata trace path */
f6a9efaa 269 ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path);
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270 if (ret < 0) {
271 perror("asprintf ust metadata");
44844c29 272 goto error_free_metadata;
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273 }
274
275 return lum;
276
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277error_free_metadata:
278 free(lum);
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279error:
280 return NULL;
281}
282
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283/*
284 * Allocate and initialize an UST context.
285 *
286 * Return pointer to structure or NULL.
287 */
288struct ltt_ust_context *trace_ust_create_context(
289 struct lttng_event_context *ctx)
290{
291 struct ltt_ust_context *uctx;
292
293 uctx = zmalloc(sizeof(struct ltt_ust_context));
294 if (uctx == NULL) {
295 PERROR("zmalloc ltt_ust_context");
296 goto error;
297 }
298
299 uctx->ctx.ctx = ctx->ctx;
bec39940 300 lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx);
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301
302 return uctx;
303
304error:
305 return NULL;
306}
307
f6a9efaa
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308/*
309 * RCU safe free context structure.
310 */
311static void destroy_context_rcu(struct rcu_head *head)
312{
bec39940
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313 struct lttng_ht_node_ulong *node =
314 caa_container_of(head, struct lttng_ht_node_ulong, head);
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315 struct ltt_ust_context *ctx =
316 caa_container_of(node, struct ltt_ust_context, node);
317
318 free(ctx);
319}
320
321/*
322 * Cleanup UST context hash table.
323 */
7bd39047 324static void destroy_contexts(struct lttng_ht *ht)
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325{
326 int ret;
bec39940
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327 struct lttng_ht_node_ulong *node;
328 struct lttng_ht_iter iter;
f6a9efaa 329
bec39940
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330 cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) {
331 ret = lttng_ht_del(ht, &iter);
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332 if (!ret) {
333 call_rcu(&node->head, destroy_context_rcu);
334 }
f6a9efaa 335 }
ed52805d 336
bec39940 337 lttng_ht_destroy(ht);
f6a9efaa
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338}
339
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340/*
341 * Cleanup ust event structure.
342 */
343void trace_ust_destroy_event(struct ltt_ust_event *event)
344{
f6a9efaa 345 DBG2("Trace destroy UST event %s", event->attr.name);
7bd39047 346 destroy_contexts(event->ctx);
ed52805d 347
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348 free(event);
349}
350
f6a9efaa
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351/*
352 * URCU intermediate call to complete destroy event.
353 */
354static void destroy_event_rcu(struct rcu_head *head)
355{
bec39940
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356 struct lttng_ht_node_str *node =
357 caa_container_of(head, struct lttng_ht_node_str, head);
f6a9efaa
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358 struct ltt_ust_event *event =
359 caa_container_of(node, struct ltt_ust_event, node);
360
361 trace_ust_destroy_event(event);
362}
363
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364/*
365 * Cleanup UST events hashtable.
366 */
7bd39047 367static void destroy_events(struct lttng_ht *events)
ed52805d
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368{
369 int ret;
bec39940
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370 struct lttng_ht_node_str *node;
371 struct lttng_ht_iter iter;
ed52805d 372
bec39940
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373 cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
374 ret = lttng_ht_del(events, &iter);
7bd39047
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375 assert(!ret);
376 call_rcu(&node->head, destroy_event_rcu);
ed52805d
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377 }
378
bec39940 379 lttng_ht_destroy(events);
ed52805d
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380}
381
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382/*
383 * Cleanup ust channel structure.
384 */
385void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
386{
f6a9efaa 387 DBG2("Trace destroy UST channel %s", channel->name);
97ee3a89 388
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389 rcu_read_lock();
390
7bd39047
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391 /* Destroying all events of the channel */
392 destroy_events(channel->events);
393 /* Destroying all context of the channel */
394 destroy_contexts(channel->ctx);
97ee3a89 395
97ee3a89 396 free(channel);
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397
398 rcu_read_unlock();
399}
400
401/*
402 * URCU intermediate call to complete destroy channel.
403 */
404static void destroy_channel_rcu(struct rcu_head *head)
405{
bec39940
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406 struct lttng_ht_node_str *node =
407 caa_container_of(head, struct lttng_ht_node_str, head);
f6a9efaa
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408 struct ltt_ust_channel *channel =
409 caa_container_of(node, struct ltt_ust_channel, node);
410
411 trace_ust_destroy_channel(channel);
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412}
413
414/*
415 * Cleanup ust metadata structure.
416 */
417void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
418{
f6a9efaa 419 DBG2("Trace UST destroy metadata %d", metadata->handle);
97ee3a89 420
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421 free(metadata);
422}
423
424/*
f6a9efaa 425 * Iterate over a hash table containing channels and cleanup safely.
97ee3a89 426 */
bec39940 427static void destroy_channels(struct lttng_ht *channels)
f6a9efaa
DG
428{
429 int ret;
bec39940
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430 struct lttng_ht_node_str *node;
431 struct lttng_ht_iter iter;
f6a9efaa 432
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433 rcu_read_lock();
434
bec39940
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435 cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) {
436 ret = lttng_ht_del(channels, &iter);
7bd39047
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437 assert(!ret);
438 call_rcu(&node->head, destroy_channel_rcu);
f6a9efaa 439 }
ed52805d 440
bec39940 441 lttng_ht_destroy(channels);
24d1723f
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442
443 rcu_read_unlock();
f6a9efaa
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444}
445
446/*
447 * Cleanup UST pid domain.
448 */
bec39940 449static void destroy_domain_pid(struct lttng_ht *ht)
f6a9efaa
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450{
451 int ret;
bec39940 452 struct lttng_ht_iter iter;
ed52805d 453 struct ltt_ust_domain_pid *dpid;
f6a9efaa 454
bec39940
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455 cds_lfht_for_each_entry(ht->ht, &iter.iter, dpid, node.node) {
456 ret = lttng_ht_del(ht , &iter);
7bd39047
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457 assert(!ret);
458 destroy_channels(dpid->channels);
f6a9efaa 459 }
ed52805d 460
bec39940 461 lttng_ht_destroy(ht);
f6a9efaa
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462}
463
464/*
465 * Cleanup UST exec name domain.
466 */
bec39940 467static void destroy_domain_exec(struct lttng_ht *ht)
97ee3a89 468{
f6a9efaa 469 int ret;
bec39940 470 struct lttng_ht_iter iter;
ed52805d 471 struct ltt_ust_domain_exec *dexec;
f6a9efaa 472
bec39940
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473 cds_lfht_for_each_entry(ht->ht, &iter.iter, dexec, node.node) {
474 ret = lttng_ht_del(ht , &iter);
7bd39047
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475 assert(!ret);
476 destroy_channels(dexec->channels);
f6a9efaa 477 }
ed52805d 478
bec39940 479 lttng_ht_destroy(ht);
f6a9efaa 480}
97ee3a89 481
f6a9efaa
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482/*
483 * Cleanup UST global domain.
484 */
485static void destroy_domain_global(struct ltt_ust_domain_global *dom)
486{
487 destroy_channels(dom->channels);
488}
97ee3a89 489
f6a9efaa
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490/*
491 * Cleanup ust session structure
492 */
493void trace_ust_destroy_session(struct ltt_ust_session *session)
494{
ed52805d 495 /* Extra protection */
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496 if (session == NULL) {
497 return;
498 }
499
f6a9efaa
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500 rcu_read_lock();
501
a991f516 502 DBG2("Trace UST destroy session %d", session->id);
f6a9efaa 503
f6a9efaa
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504 /* Cleaning up UST domain */
505 destroy_domain_global(&session->domain_global);
506 destroy_domain_pid(session->domain_pid);
507 destroy_domain_exec(session->domain_exec);
44d3bd01 508
97ee3a89 509 free(session);
f6a9efaa
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510
511 rcu_read_unlock();
97ee3a89 512}
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