Fix id vs uid confusion introduced by merge of new hash table code
[lttng-tools.git] / lttng-sessiond / ust-app.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
5 * modify it under the terms of the GNU General Public License
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6 * as published by the Free Software Foundation; only version 2
7 * of the License.
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8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19#define _GNU_SOURCE
20#include <errno.h>
21#include <pthread.h>
22#include <stdio.h>
23#include <stdlib.h>
099e26bd 24#include <string.h>
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25#include <sys/stat.h>
26#include <sys/types.h>
099e26bd 27#include <unistd.h>
60b6c79c 28#include <runas.h>
91d76f53 29
0df502fd 30#include <urcu/compiler.h>
bec39940 31
1e307fab 32#include <lttngerr.h>
bec39940 33#include <lttng-ht.h>
48842b30 34#include <lttng-share.h>
60b6c79c 35#include <runas.h>
1e307fab 36
56fff090 37#include "ust-app.h"
48842b30 38#include "ust-consumer.h"
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39#include "ust-ctl.h"
40
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41/*
42 * Delete ust context safely. RCU read lock must be held before calling
43 * this function.
44 */
45static
46void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
47{
48 if (ua_ctx->obj) {
49 ustctl_release_object(sock, ua_ctx->obj);
50 free(ua_ctx->obj);
51 }
52 free(ua_ctx);
53}
54
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55/*
56 * Delete ust app event safely. RCU read lock must be held before calling
57 * this function.
58 */
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59static
60void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
d80a6244 61{
55cc08a6 62 int ret;
bec39940 63 struct lttng_ht_iter iter;
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64 struct ust_app_ctx *ua_ctx;
65
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66 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter.iter, ua_ctx,
67 node.node) {
68 ret = lttng_ht_del(ua_event->ctx, &iter);
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69 assert(!ret);
70 delete_ust_app_ctx(sock, ua_ctx);
71 }
bec39940 72 lttng_ht_destroy(ua_event->ctx);
d80a6244 73
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74 if (ua_event->obj != NULL) {
75 ustctl_release_object(sock, ua_event->obj);
76 free(ua_event->obj);
77 }
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78 free(ua_event);
79}
80
81/*
82 * Delete ust app stream safely. RCU read lock must be held before calling
83 * this function.
84 */
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85static
86void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
d80a6244 87{
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88 if (stream->obj) {
89 ustctl_release_object(sock, stream->obj);
90 free(stream->obj);
91 }
84cd17c6 92 free(stream);
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93}
94
95/*
96 * Delete ust app channel safely. RCU read lock must be held before calling
97 * this function.
98 */
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99static
100void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
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101{
102 int ret;
bec39940 103 struct lttng_ht_iter iter;
d80a6244 104 struct ust_app_event *ua_event;
55cc08a6 105 struct ust_app_ctx *ua_ctx;
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106 struct ltt_ust_stream *stream, *stmp;
107
55cc08a6 108 /* Wipe stream */
d80a6244 109 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 110 cds_list_del(&stream->list);
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111 delete_ust_app_stream(sock, stream);
112 }
113
55cc08a6 114 /* Wipe context */
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115 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
116 ret = lttng_ht_del(ua_chan->ctx, &iter);
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117 assert(!ret);
118 delete_ust_app_ctx(sock, ua_ctx);
119 }
bec39940 120 lttng_ht_destroy(ua_chan->ctx);
d80a6244 121
55cc08a6 122 /* Wipe events */
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123 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
124 node.node) {
125 ret = lttng_ht_del(ua_chan->events, &iter);
525b0740 126 assert(!ret);
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127 delete_ust_app_event(sock, ua_event);
128 }
bec39940 129 lttng_ht_destroy(ua_chan->events);
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130
131 if (ua_chan->obj != NULL) {
132 ustctl_release_object(sock, ua_chan->obj);
133 free(ua_chan->obj);
134 }
84cd17c6 135 free(ua_chan);
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136}
137
138/*
139 * Delete ust app session safely. RCU read lock must be held before calling
140 * this function.
141 */
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142static
143void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
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144{
145 int ret;
bec39940 146 struct lttng_ht_iter iter;
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147 struct ust_app_channel *ua_chan;
148
149 if (ua_sess->metadata) {
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150 if (ua_sess->metadata->stream_obj) {
151 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
152 free(ua_sess->metadata->stream_obj);
153 }
154 if (ua_sess->metadata->obj) {
155 ustctl_release_object(sock, ua_sess->metadata->obj);
156 free(ua_sess->metadata->obj);
157 }
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158 }
159
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160 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
161 node.node) {
162 ret = lttng_ht_del(ua_sess->channels, &iter);
525b0740 163 assert(!ret);
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164 delete_ust_app_channel(sock, ua_chan);
165 }
bec39940 166 lttng_ht_destroy(ua_sess->channels);
d80a6244 167
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168 if (ua_sess->handle != -1) {
169 ustctl_release_handle(sock, ua_sess->handle);
170 }
8b366481 171 free(ua_sess);
d80a6244 172}
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173
174/*
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175 * Delete a traceable application structure from the global list. Never call
176 * this function outside of a call_rcu call.
91d76f53 177 */
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178static
179void delete_ust_app(struct ust_app *app)
91d76f53 180{
8b366481 181 int ret, sock;
bec39940 182 struct lttng_ht_iter iter;
284d8f55 183 struct ust_app_session *ua_sess;
44d3bd01 184
f6a9efaa 185 rcu_read_lock();
44d3bd01 186
d80a6244 187 /* Delete ust app sessions info */
6414a713
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188 sock = app->key.sock;
189 app->key.sock = -1;
d80a6244 190
8b366481 191 /* Wipe sessions */
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192 cds_lfht_for_each_entry(app->sessions->ht, &iter.iter, ua_sess,
193 node.node) {
194 ret = lttng_ht_del(app->sessions, &iter);
525b0740 195 assert(!ret);
284d8f55 196 delete_ust_app_session(app->key.sock, ua_sess);
d80a6244 197 }
bec39940 198 lttng_ht_destroy(app->sessions);
d80a6244 199
6414a713 200 /*
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201 * Wait until we have removed the key from the sock hash table before
202 * closing this socket, otherwise an application could re-use the socket ID
203 * and race with the teardown, using the same hash table entry.
6414a713
MD
204 */
205 close(sock);
d80a6244 206
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207 DBG2("UST app pid %d deleted", app->key.pid);
208 free(app);
bec39940 209
f6a9efaa 210 rcu_read_unlock();
099e26bd
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211}
212
213/*
f6a9efaa 214 * URCU intermediate call to delete an UST app.
099e26bd 215 */
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216static
217void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 218{
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219 struct lttng_ht_node_ulong *node =
220 caa_container_of(head, struct lttng_ht_node_ulong, head);
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221 struct ust_app *app =
222 caa_container_of(node, struct ust_app, node);
223
bec39940 224 DBG3("Call RCU deleting app PID %d", app->key.pid);
f6a9efaa 225 delete_ust_app(app);
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226}
227
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228/*
229 * Alloc new UST app session.
230 */
231static
232struct ust_app_session *alloc_ust_app_session(void)
233{
234 struct ust_app_session *ua_sess;
235
236 /* Init most of the default value by allocating and zeroing */
237 ua_sess = zmalloc(sizeof(struct ust_app_session));
238 if (ua_sess == NULL) {
239 PERROR("malloc");
240 goto error;
241 }
242
243 ua_sess->handle = -1;
bec39940 244 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
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245
246 return ua_sess;
247
248error:
249 return NULL;
250}
251
252/*
253 * Alloc new UST app channel.
254 */
255static
256struct ust_app_channel *alloc_ust_app_channel(char *name,
257 struct lttng_ust_channel *attr)
258{
259 struct ust_app_channel *ua_chan;
260
261 /* Init most of the default value by allocating and zeroing */
262 ua_chan = zmalloc(sizeof(struct ust_app_channel));
263 if (ua_chan == NULL) {
264 PERROR("malloc");
265 goto error;
266 }
267
268 /* Setup channel name */
269 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
270 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
271
272 ua_chan->enabled = 1;
273 ua_chan->handle = -1;
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274 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
275 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
276 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
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277
278 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
279
280 /* Copy attributes */
281 if (attr) {
282 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
283 }
284
285 DBG3("UST app channel %s allocated", ua_chan->name);
286
287 return ua_chan;
288
289error:
290 return NULL;
291}
292
293/*
294 * Alloc new UST app event.
295 */
296static
297struct ust_app_event *alloc_ust_app_event(char *name,
298 struct lttng_ust_event *attr)
299{
300 struct ust_app_event *ua_event;
301
302 /* Init most of the default value by allocating and zeroing */
303 ua_event = zmalloc(sizeof(struct ust_app_event));
304 if (ua_event == NULL) {
305 PERROR("malloc");
306 goto error;
307 }
308
309 ua_event->enabled = 1;
310 strncpy(ua_event->name, name, sizeof(ua_event->name));
311 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
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DG
312 ua_event->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
313 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
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314
315 /* Copy attributes */
316 if (attr) {
317 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
318 }
319
320 DBG3("UST app event %s allocated", ua_event->name);
321
322 return ua_event;
323
324error:
325 return NULL;
326}
327
328/*
329 * Alloc new UST app context.
330 */
331static
332struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
333{
334 struct ust_app_ctx *ua_ctx;
335
336 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
337 if (ua_ctx == NULL) {
338 goto error;
339 }
340
341 if (uctx) {
342 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
343 }
344
345 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
346
347error:
348 return ua_ctx;
349}
350
099e26bd 351/*
421cb601
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352 * Find an ust_app using the sock and return it. RCU read side lock must be
353 * held before calling this helper function.
099e26bd 354 */
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355static
356struct ust_app *find_app_by_sock(int sock)
099e26bd 357{
bec39940 358 struct lttng_ht_node_ulong *node;
f6a9efaa 359 struct ust_app_key *key;
bec39940 360 struct lttng_ht_iter iter;
f6a9efaa 361
bec39940
DG
362 lttng_ht_lookup(ust_app_sock_key_map, (void *)((unsigned long) sock),
363 &iter);
364 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
365 if (node == NULL) {
366 DBG2("UST app find by sock %d key not found", sock);
f6a9efaa
DG
367 goto error;
368 }
f6a9efaa
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369 key = caa_container_of(node, struct ust_app_key, node);
370
bec39940
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371 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) key->pid), &iter);
372 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
373 if (node == NULL) {
374 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
375 goto error;
376 }
f6a9efaa
DG
377 return caa_container_of(node, struct ust_app, node);
378
379error:
380 return NULL;
099e26bd
DG
381}
382
55cc08a6
DG
383/*
384 * Create the channel context on the tracer.
385 */
386static
387int create_ust_channel_context(struct ust_app_channel *ua_chan,
388 struct ust_app_ctx *ua_ctx, struct ust_app *app)
389{
390 int ret;
391
392 ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
393 ua_chan->obj, &ua_ctx->obj);
394 if (ret < 0) {
395 goto error;
396 }
397
398 ua_ctx->handle = ua_ctx->obj->handle;
399
400 DBG2("UST app context added to channel %s successfully", ua_chan->name);
401
402error:
403 return ret;
404}
405
406/*
407 * Create the event context on the tracer.
408 */
409static
410int create_ust_event_context(struct ust_app_event *ua_event,
411 struct ust_app_ctx *ua_ctx, struct ust_app *app)
412{
413 int ret;
414
415 ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
416 ua_event->obj, &ua_ctx->obj);
417 if (ret < 0) {
418 goto error;
419 }
420
421 ua_ctx->handle = ua_ctx->obj->handle;
422
423 DBG2("UST app context added to event %s successfully", ua_event->name);
424
425error:
426 return ret;
427}
428
9730260e
DG
429/*
430 * Disable the specified event on to UST tracer for the UST session.
431 */
432static int disable_ust_event(struct ust_app *app,
433 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
434{
435 int ret;
436
437 ret = ustctl_disable(app->key.sock, ua_event->obj);
438 if (ret < 0) {
439 ERR("UST app event %s disable failed for app (pid: %d) "
440 "and session handle %d with ret %d",
441 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
442 goto error;
443 }
444
445 DBG2("UST app event %s disabled successfully for app (pid: %d)",
446 ua_event->attr.name, app->key.pid);
447
448error:
449 return ret;
450}
451
78f0bacd
DG
452/*
453 * Disable the specified channel on to UST tracer for the UST session.
454 */
455static int disable_ust_channel(struct ust_app *app,
456 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
457{
458 int ret;
459
460 ret = ustctl_disable(app->key.sock, ua_chan->obj);
461 if (ret < 0) {
462 ERR("UST app channel %s disable failed for app (pid: %d) "
463 "and session handle %d with ret %d",
464 ua_chan->name, app->key.pid, ua_sess->handle, ret);
465 goto error;
466 }
467
78f0bacd
DG
468 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
469 ua_chan->name, app->key.pid);
470
471error:
472 return ret;
473}
474
475/*
476 * Enable the specified channel on to UST tracer for the UST session.
477 */
478static int enable_ust_channel(struct ust_app *app,
479 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
480{
481 int ret;
482
483 ret = ustctl_enable(app->key.sock, ua_chan->obj);
484 if (ret < 0) {
485 ERR("UST app channel %s enable failed for app (pid: %d) "
486 "and session handle %d with ret %d",
487 ua_chan->name, app->key.pid, ua_sess->handle, ret);
488 goto error;
489 }
490
491 ua_chan->enabled = 1;
492
493 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
494 ua_chan->name, app->key.pid);
495
496error:
497 return ret;
498}
499
edb67388
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500/*
501 * Enable the specified event on to UST tracer for the UST session.
502 */
503static int enable_ust_event(struct ust_app *app,
504 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
505{
506 int ret;
507
508 ret = ustctl_enable(app->key.sock, ua_event->obj);
509 if (ret < 0) {
510 ERR("UST app event %s enable failed for app (pid: %d) "
511 "and session handle %d with ret %d",
512 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
513 goto error;
514 }
515
516 DBG2("UST app event %s enabled successfully for app (pid: %d)",
517 ua_event->attr.name, app->key.pid);
518
519error:
520 return ret;
521}
522
099e26bd 523/*
5b4a0ec0 524 * Open metadata onto the UST tracer for a UST session.
0177d773 525 */
5b4a0ec0
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526static int open_ust_metadata(struct ust_app *app,
527 struct ust_app_session *ua_sess)
0177d773 528{
5b4a0ec0
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529 int ret;
530 struct lttng_ust_channel_attr uattr;
0177d773 531
5b4a0ec0
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532 uattr.overwrite = ua_sess->metadata->attr.overwrite;
533 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
534 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
535 uattr.switch_timer_interval =
536 ua_sess->metadata->attr.switch_timer_interval;
537 uattr.read_timer_interval =
538 ua_sess->metadata->attr.read_timer_interval;
539 uattr.output = ua_sess->metadata->attr.output;
540
541 /* UST tracer metadata creation */
542 ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr,
543 &ua_sess->metadata->obj);
544 if (ret < 0) {
545 ERR("UST app open metadata failed for app pid:%d",
546 app->key.pid);
f6a9efaa 547 goto error;
0177d773 548 }
f6a9efaa 549
6d3686da
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550 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
551
f6a9efaa 552error:
5b4a0ec0 553 return ret;
91d76f53
DG
554}
555
556/*
5b4a0ec0 557 * Create stream onto the UST tracer for a UST session.
91d76f53 558 */
5b4a0ec0
DG
559static int create_ust_stream(struct ust_app *app,
560 struct ust_app_session *ua_sess)
91d76f53 561{
5b4a0ec0 562 int ret;
421cb601 563
5b4a0ec0
DG
564 ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj,
565 &ua_sess->metadata->stream_obj);
566 if (ret < 0) {
567 ERR("UST create metadata stream failed");
421cb601 568 goto error;
91d76f53 569 }
421cb601 570
421cb601 571error:
5b4a0ec0 572 return ret;
91d76f53
DG
573}
574
b551a063 575/*
5b4a0ec0 576 * Create the specified channel onto the UST tracer for a UST session.
b551a063 577 */
5b4a0ec0
DG
578static int create_ust_channel(struct ust_app *app,
579 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
b551a063 580{
5b4a0ec0 581 int ret;
b551a063 582
5b4a0ec0
DG
583 /* TODO: remove cast and use lttng-ust-abi.h */
584 ret = ustctl_create_channel(app->key.sock, ua_sess->handle,
585 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
586 if (ret < 0) {
587 DBG("Error creating channel %s for app (pid: %d, sock: %d) "
588 "and session handle %d with ret %d",
589 ua_chan->name, app->key.pid, app->key.sock,
590 ua_sess->handle, ret);
b551a063
DG
591 goto error;
592 }
593
5b4a0ec0
DG
594 ua_chan->handle = ua_chan->obj->handle;
595 ua_chan->attr.shm_fd = ua_chan->obj->shm_fd;
596 ua_chan->attr.wait_fd = ua_chan->obj->wait_fd;
597 ua_chan->attr.memory_map_size = ua_chan->obj->memory_map_size;
b551a063 598
5b4a0ec0
DG
599 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
600 ua_chan->name, app->key.pid, app->key.sock);
b551a063 601
8535a6d9
DG
602 /* If channel is not enabled, disable it on the tracer */
603 if (!ua_chan->enabled) {
604 ret = disable_ust_channel(app, ua_sess, ua_chan);
605 if (ret < 0) {
606 goto error;
607 }
608 }
609
b551a063
DG
610error:
611 return ret;
612}
613
91d76f53 614/*
5b4a0ec0 615 * Create the specified event onto the UST tracer for a UST session.
91d76f53 616 */
edb67388
DG
617static
618int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
619 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 620{
5b4a0ec0 621 int ret = 0;
284d8f55 622
5b4a0ec0
DG
623 /* Create UST event on tracer */
624 ret = ustctl_create_event(app->key.sock, &ua_event->attr, ua_chan->obj,
625 &ua_event->obj);
626 if (ret < 0) {
627 ERR("Error ustctl create event %s for app pid: %d with ret %d",
628 ua_event->attr.name, app->key.pid, ret);
629 goto error;
91d76f53 630 }
f6a9efaa 631
5b4a0ec0 632 ua_event->handle = ua_event->obj->handle;
284d8f55 633
5b4a0ec0
DG
634 DBG2("UST app event %s created successfully for pid:%d",
635 ua_event->attr.name, app->key.pid);
f6a9efaa 636
8535a6d9
DG
637 /* If event not enabled, disable it on the tracer */
638 if (!ua_event->enabled) {
639 ret = disable_ust_event(app, ua_sess, ua_event);
640 if (ret < 0) {
641 goto error;
642 }
643 }
644
5b4a0ec0
DG
645error:
646 return ret;
91d76f53 647}
48842b30 648
5b4a0ec0
DG
649/*
650 * Copy data between an UST app event and a LTT event.
651 */
421cb601 652static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
653 struct ltt_ust_event *uevent)
654{
bec39940 655 struct lttng_ht_iter iter;
55cc08a6
DG
656 struct ltt_ust_context *uctx;
657 struct ust_app_ctx *ua_ctx;
658
48842b30
DG
659 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
660 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
661
5b4a0ec0
DG
662 /* Copy event attributes */
663 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
664
bec39940 665 cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
666 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
667 if (ua_ctx == NULL) {
668 continue;
669 }
bec39940
DG
670 lttng_ht_node_init_ulong(&ua_ctx->node,
671 (unsigned long) ua_ctx->ctx.ctx);
672 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6 673 }
48842b30
DG
674}
675
5b4a0ec0
DG
676/*
677 * Copy data between an UST app channel and a LTT channel.
678 */
421cb601 679static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
680 struct ltt_ust_channel *uchan)
681{
bec39940
DG
682 struct lttng_ht_iter iter;
683 struct lttng_ht_node_str *ua_event_node;
48842b30 684 struct ltt_ust_event *uevent;
55cc08a6 685 struct ltt_ust_context *uctx;
48842b30 686 struct ust_app_event *ua_event;
55cc08a6 687 struct ust_app_ctx *ua_ctx;
48842b30 688
421cb601 689 DBG2("Shadow copy of UST app channel %s", ua_chan->name);
48842b30
DG
690
691 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
692 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
5b4a0ec0
DG
693 /* Copy event attributes */
694 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
48842b30 695
bec39940 696 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
697 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
698 if (ua_ctx == NULL) {
699 continue;
700 }
bec39940
DG
701 lttng_ht_node_init_ulong(&ua_ctx->node,
702 (unsigned long) ua_ctx->ctx.ctx);
703 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6 704 }
48842b30 705
421cb601 706 /* Copy all events from ltt ust channel to ust app channel */
bec39940
DG
707 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
708 struct lttng_ht_iter uiter;
ba767faf 709
bec39940
DG
710 lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter);
711 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
48842b30 712 if (ua_event_node == NULL) {
421cb601 713 DBG2("UST event %s not found on shadow copy channel",
48842b30 714 uevent->attr.name);
284d8f55 715 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 716 if (ua_event == NULL) {
5b4a0ec0 717 continue;
48842b30 718 }
421cb601 719 shadow_copy_event(ua_event, uevent);
bec39940 720 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
48842b30 721 }
48842b30
DG
722 }
723
421cb601 724 DBG3("Shadow copy channel done");
48842b30
DG
725}
726
5b4a0ec0
DG
727/*
728 * Copy data between a UST app session and a regular LTT session.
729 */
421cb601 730static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 731 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 732{
bec39940
DG
733 struct lttng_ht_node_str *ua_chan_node;
734 struct lttng_ht_iter iter;
48842b30
DG
735 struct ltt_ust_channel *uchan;
736 struct ust_app_channel *ua_chan;
477d7741
MD
737 time_t rawtime;
738 struct tm *timeinfo;
739 char datetime[16];
740 int ret;
741
742 /* Get date and time for unique app path */
743 time(&rawtime);
744 timeinfo = localtime(&rawtime);
745 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 746
421cb601 747 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 748
a991f516 749 ua_sess->id = usess->id;
6df2e2c9
MD
750 ua_sess->uid = usess->uid;
751 ua_sess->gid = usess->gid;
48842b30 752
477d7741
MD
753 ret = snprintf(ua_sess->path, PATH_MAX,
754 "%s/%s-%d-%s",
755 usess->pathname, app->name, app->key.pid,
756 datetime);
757 if (ret < 0) {
758 PERROR("asprintf UST shadow copy session");
759 /* TODO: We cannot return an error from here.. */
760 assert(0);
761 }
762
48842b30
DG
763 /* TODO: support all UST domain */
764
765 /* Iterate over all channels in global domain. */
bec39940
DG
766 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
767 uchan, node.node) {
768 struct lttng_ht_iter uiter;
ba767faf 769
bec39940
DG
770 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
771 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
5b4a0ec0
DG
772 if (ua_chan_node != NULL) {
773 continue;
774 }
421cb601 775
5b4a0ec0
DG
776 DBG2("Channel %s not found on shadow session copy, creating it",
777 uchan->name);
778 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
779 if (ua_chan == NULL) {
780 /* malloc failed... continuing */
781 continue;
48842b30
DG
782 }
783
5b4a0ec0 784 shadow_copy_channel(ua_chan, uchan);
bec39940 785 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
48842b30
DG
786 }
787}
788
78f0bacd
DG
789/*
790 * Lookup sesison wrapper.
791 */
84cd17c6
MD
792static
793void __lookup_session_by_app(struct ltt_ust_session *usess,
bec39940 794 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
795{
796 /* Get right UST app session from app */
2c348c10 797 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
84cd17c6
MD
798}
799
421cb601
DG
800/*
801 * Return ust app session from the app session hashtable using the UST session
a991f516 802 * id.
421cb601 803 */
48842b30
DG
804static struct ust_app_session *lookup_session_by_app(
805 struct ltt_ust_session *usess, struct ust_app *app)
806{
bec39940
DG
807 struct lttng_ht_iter iter;
808 struct lttng_ht_node_ulong *node;
48842b30 809
84cd17c6 810 __lookup_session_by_app(usess, app, &iter);
bec39940 811 node = lttng_ht_iter_get_node_ulong(&iter);
48842b30
DG
812 if (node == NULL) {
813 goto error;
814 }
815
816 return caa_container_of(node, struct ust_app_session, node);
817
818error:
819 return NULL;
820}
821
421cb601
DG
822/*
823 * Create a UST session onto the tracer of app and add it the session
824 * hashtable.
825 *
826 * Return ust app session or NULL on error.
827 */
828static struct ust_app_session *create_ust_app_session(
829 struct ltt_ust_session *usess, struct ust_app *app)
830{
831 int ret;
832 struct ust_app_session *ua_sess;
833
834 ua_sess = lookup_session_by_app(usess, app);
835 if (ua_sess == NULL) {
a991f516
MD
836 DBG2("UST app pid: %d session id %d not found, creating it",
837 app->key.pid, usess->id);
421cb601
DG
838 ua_sess = alloc_ust_app_session();
839 if (ua_sess == NULL) {
840 /* Only malloc can failed so something is really wrong */
841 goto error;
842 }
477d7741 843 shadow_copy_session(ua_sess, usess, app);
421cb601
DG
844 }
845
846 if (ua_sess->handle == -1) {
847 ret = ustctl_create_session(app->key.sock);
848 if (ret < 0) {
849 ERR("Error creating session for app pid %d, sock %d",
850 app->key.pid, app->key.sock);
851 /* TODO: free() ua_sess */
852 goto error;
853 }
854
855 DBG2("UST app ustctl create session handle %d", ret);
856 ua_sess->handle = ret;
857
858 /* Add ust app session to app's HT */
2c348c10 859 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
bec39940 860 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
421cb601
DG
861
862 DBG2("UST app session created successfully with handle %d", ret);
863 }
864
865 return ua_sess;
866
867error:
868 return NULL;
869}
870
55cc08a6
DG
871/*
872 * Create a context for the channel on the tracer.
873 */
874static
875int create_ust_app_channel_context(struct ust_app_session *ua_sess,
876 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
877 struct ust_app *app)
878{
879 int ret = 0;
bec39940
DG
880 struct lttng_ht_iter iter;
881 struct lttng_ht_node_ulong *node;
55cc08a6
DG
882 struct ust_app_ctx *ua_ctx;
883
884 DBG2("UST app adding context to channel %s", ua_chan->name);
885
bec39940
DG
886 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
887 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
888 if (node != NULL) {
889 ret = -EEXIST;
890 goto error;
891 }
892
893 ua_ctx = alloc_ust_app_ctx(uctx);
894 if (ua_ctx == NULL) {
895 /* malloc failed */
896 ret = -1;
897 goto error;
898 }
899
bec39940
DG
900 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
901 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6
DG
902
903 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
904 if (ret < 0) {
905 goto error;
906 }
907
908error:
909 return ret;
910}
911
912/*
913 * Create an UST context and enable it for the event on the tracer.
914 */
915static
916int create_ust_app_event_context(struct ust_app_session *ua_sess,
917 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
918 struct ust_app *app)
919{
920 int ret = 0;
bec39940
DG
921 struct lttng_ht_iter iter;
922 struct lttng_ht_node_ulong *node;
55cc08a6
DG
923 struct ust_app_ctx *ua_ctx;
924
925 DBG2("UST app adding context to event %s", ua_event->name);
926
bec39940
DG
927 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
928 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
929 if (node != NULL) {
930 ret = -EEXIST;
931 goto error;
932 }
933
934 ua_ctx = alloc_ust_app_ctx(uctx);
935 if (ua_ctx == NULL) {
936 /* malloc failed */
937 ret = -1;
938 goto error;
939 }
940
bec39940
DG
941 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
942 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6
DG
943
944 ret = create_ust_event_context(ua_event, ua_ctx, app);
945 if (ret < 0) {
946 goto error;
947 }
948
949error:
950 return ret;
951}
952
edb67388
DG
953/*
954 * Enable on the tracer side a ust app event for the session and channel.
955 */
956static
957int enable_ust_app_event(struct ust_app_session *ua_sess,
35a9059d 958 struct ust_app_event *ua_event, struct ust_app *app)
edb67388
DG
959{
960 int ret;
961
962 ret = enable_ust_event(app, ua_sess, ua_event);
963 if (ret < 0) {
964 goto error;
965 }
966
967 ua_event->enabled = 1;
968
969error:
970 return ret;
971}
972
9730260e
DG
973/*
974 * Disable on the tracer side a ust app event for the session and channel.
975 */
976static int disable_ust_app_event(struct ust_app_session *ua_sess,
7f79d3a1 977 struct ust_app_event *ua_event, struct ust_app *app)
9730260e
DG
978{
979 int ret;
980
981 ret = disable_ust_event(app, ua_sess, ua_event);
982 if (ret < 0) {
983 goto error;
984 }
985
986 ua_event->enabled = 0;
987
988error:
989 return ret;
990}
991
78f0bacd
DG
992/*
993 * Lookup ust app channel for session and disable it on the tracer side.
994 */
8535a6d9
DG
995static
996int disable_ust_app_channel(struct ust_app_session *ua_sess,
997 struct ust_app_channel *ua_chan, struct ust_app *app)
78f0bacd 998{
8535a6d9 999 int ret;
78f0bacd
DG
1000
1001 ret = disable_ust_channel(app, ua_sess, ua_chan);
1002 if (ret < 0) {
1003 goto error;
1004 }
1005
8535a6d9
DG
1006 ua_chan->enabled = 0;
1007
78f0bacd
DG
1008error:
1009 return ret;
1010}
1011
1012/*
1013 * Lookup ust app channel for session and enable it on the tracer side.
1014 */
1015static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1016 struct ltt_ust_channel *uchan, struct ust_app *app)
1017{
1018 int ret = 0;
bec39940
DG
1019 struct lttng_ht_iter iter;
1020 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1021 struct ust_app_channel *ua_chan;
1022
bec39940
DG
1023 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1024 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
78f0bacd 1025 if (ua_chan_node == NULL) {
a991f516
MD
1026 DBG2("Unable to find channel %s in ust session id %u",
1027 uchan->name, ua_sess->id);
78f0bacd
DG
1028 goto error;
1029 }
1030
1031 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1032
1033 ret = enable_ust_channel(app, ua_sess, ua_chan);
1034 if (ret < 0) {
1035 goto error;
1036 }
1037
1038error:
1039 return ret;
1040}
1041
284d8f55 1042/*
5b4a0ec0 1043 * Create UST app channel and create it on the tracer.
284d8f55 1044 */
5b4a0ec0
DG
1045static struct ust_app_channel *create_ust_app_channel(
1046 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1047 struct ust_app *app)
1048{
1049 int ret = 0;
bec39940
DG
1050 struct lttng_ht_iter iter;
1051 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
1052 struct ust_app_channel *ua_chan;
1053
1054 /* Lookup channel in the ust app session */
bec39940
DG
1055 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1056 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
5b4a0ec0 1057 if (ua_chan_node == NULL) {
a991f516
MD
1058 DBG2("Unable to find channel %s in ust session id %u",
1059 uchan->name, ua_sess->id);
5b4a0ec0
DG
1060 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1061 if (ua_chan == NULL) {
1062 goto error;
1063 }
1064 shadow_copy_channel(ua_chan, uchan);
1065
bec39940 1066 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
5b4a0ec0
DG
1067 } else {
1068 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1069 }
1070
1071 ret = create_ust_channel(app, ua_sess, ua_chan);
1072 if (ret < 0) {
1073 goto error;
1074 }
1075
1076 return ua_chan;
1077
1078error:
1079 return NULL;
1080}
1081
1082/*
1083 * Create UST app event and create it on the tracer side.
1084 */
edb67388
DG
1085static
1086int create_ust_app_event(struct ust_app_session *ua_sess,
1087 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1088 struct ust_app *app)
284d8f55 1089{
edb67388 1090 int ret = 0;
bec39940
DG
1091 struct lttng_ht_iter iter;
1092 struct lttng_ht_node_str *ua_event_node;
5b4a0ec0 1093 struct ust_app_event *ua_event;
284d8f55 1094
5b4a0ec0 1095 /* Get event node */
bec39940
DG
1096 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1097 ua_event_node = lttng_ht_iter_get_node_str(&iter);
edb67388
DG
1098 if (ua_event_node != NULL) {
1099 ERR("UST app event %s already exist. Stopping creation.",
1100 uevent->attr.name);
1101 goto end;
1102 }
5b4a0ec0 1103
edb67388
DG
1104 /* Does not exist so create one */
1105 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1106 if (ua_event == NULL) {
1107 /* Only malloc can failed so something is really wrong */
1108 ret = -ENOMEM;
1109 goto error;
5b4a0ec0 1110 }
edb67388 1111 shadow_copy_event(ua_event, uevent);
5b4a0ec0 1112
edb67388 1113 /* Create it on the tracer side */
5b4a0ec0 1114 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 1115 if (ret < 0) {
e5abf1bf 1116 rcu_read_lock();
edb67388 1117 delete_ust_app_event(app->key.sock, ua_event);
e5abf1bf 1118 rcu_read_unlock();
284d8f55
DG
1119 goto error;
1120 }
1121
8535a6d9
DG
1122 ua_event->enabled = 1;
1123
bec39940 1124 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
284d8f55 1125
7f79d3a1
DG
1126 DBG2("UST app create event %s for PID %d completed",
1127 ua_event->name, app->key.pid);
1128
edb67388 1129end:
5b4a0ec0 1130error:
edb67388 1131 return ret;
5b4a0ec0
DG
1132}
1133
1134/*
1135 * Create UST metadata and open it on the tracer side.
1136 */
1137static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1138 char *pathname, struct ust_app *app)
1139{
1140 int ret = 0;
1141
1142 if (ua_sess->metadata == NULL) {
1143 /* Allocate UST metadata */
1144 ua_sess->metadata = trace_ust_create_metadata(pathname);
1145 if (ua_sess->metadata == NULL) {
1146 ERR("UST app session %d creating metadata failed",
1147 ua_sess->handle);
1148 goto error;
1149 }
1150
1151 ret = open_ust_metadata(app, ua_sess);
1152 if (ret < 0) {
1153 goto error;
1154 }
1155
1156 DBG2("UST metadata opened for app pid %d", app->key.pid);
1157 }
1158
1159 /* Open UST metadata stream */
1160 if (ua_sess->metadata->stream_obj == NULL) {
1161 ret = create_ust_stream(app, ua_sess);
1162 if (ret < 0) {
1163 goto error;
1164 }
1165
67f747d8
MD
1166 ret = mkdir_run_as(ua_sess->path, S_IRWXU | S_IRWXG,
1167 ua_sess->uid, ua_sess->gid);
5b4a0ec0
DG
1168 if (ret < 0) {
1169 PERROR("mkdir UST metadata");
1170 goto error;
1171 }
1172
477d7741
MD
1173 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1174 "%s/metadata", ua_sess->path);
5b4a0ec0
DG
1175 if (ret < 0) {
1176 PERROR("asprintf UST create stream");
1177 goto error;
1178 }
1179
1180 DBG2("UST metadata stream object created for app pid %d",
1181 app->key.pid);
1182 } else {
1183 ERR("Attempting to create stream without metadata opened");
1184 goto error;
1185 }
1186
1187 return 0;
1188
1189error:
1190 return -1;
1191}
1192
1193/*
1194 * Return pointer to traceable apps list.
1195 */
bec39940 1196struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
1197{
1198 return ust_app_ht;
1199}
1200
1201/*
1202 * Return ust app pointer or NULL if not found.
1203 */
1204struct ust_app *ust_app_find_by_pid(pid_t pid)
1205{
bec39940
DG
1206 struct lttng_ht_node_ulong *node;
1207 struct lttng_ht_iter iter;
5b4a0ec0
DG
1208
1209 rcu_read_lock();
bec39940
DG
1210 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1211 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
1212 if (node == NULL) {
1213 DBG2("UST app no found with pid %d", pid);
1214 goto error;
1215 }
1216 rcu_read_unlock();
1217
1218 DBG2("Found UST app by pid %d", pid);
1219
1220 return caa_container_of(node, struct ust_app, node);
1221
1222error:
1223 rcu_read_unlock();
1224 return NULL;
1225}
1226
1227/*
1228 * Using pid and uid (of the app), allocate a new ust_app struct and
1229 * add it to the global traceable app list.
1230 *
0df502fd
MD
1231 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1232 * bitness is not supported.
5b4a0ec0
DG
1233 */
1234int ust_app_register(struct ust_register_msg *msg, int sock)
1235{
1236 struct ust_app *lta;
1237
7753dea8
MD
1238 if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
1239 || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
f943b0fb 1240 ERR("Registration failed: application \"%s\" (pid: %d) has "
7753dea8
MD
1241 "%d-bit long, but no consumerd for this long size is available.\n",
1242 msg->name, msg->pid, msg->bits_per_long);
88ff5b7f 1243 close(sock);
0df502fd
MD
1244 return -EINVAL;
1245 }
5b4a0ec0
DG
1246 lta = zmalloc(sizeof(struct ust_app));
1247 if (lta == NULL) {
1248 PERROR("malloc");
1249 return -ENOMEM;
1250 }
1251
1252 lta->ppid = msg->ppid;
1253 lta->uid = msg->uid;
1254 lta->gid = msg->gid;
7753dea8 1255 lta->bits_per_long = msg->bits_per_long;
5b4a0ec0
DG
1256 lta->v_major = msg->major;
1257 lta->v_minor = msg->minor;
1258 strncpy(lta->name, msg->name, sizeof(lta->name));
1259 lta->name[16] = '\0';
bec39940 1260 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
5b4a0ec0
DG
1261
1262 /* Set key map */
1263 lta->key.pid = msg->pid;
bec39940 1264 lttng_ht_node_init_ulong(&lta->node, (unsigned long)lta->key.pid);
5b4a0ec0 1265 lta->key.sock = sock;
bec39940 1266 lttng_ht_node_init_ulong(&lta->key.node, (unsigned long)lta->key.sock);
5b4a0ec0
DG
1267
1268 rcu_read_lock();
bec39940
DG
1269 lttng_ht_add_unique_ulong(ust_app_sock_key_map, &lta->key.node);
1270 lttng_ht_add_unique_ulong(ust_app_ht, &lta->node);
5b4a0ec0
DG
1271 rcu_read_unlock();
1272
1273 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1274 " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid,
1275 lta->key.sock, lta->name, lta->v_major, lta->v_minor);
1276
1277 return 0;
1278}
1279
1280/*
1281 * Unregister app by removing it from the global traceable app list and freeing
1282 * the data struct.
1283 *
1284 * The socket is already closed at this point so no close to sock.
1285 */
1286void ust_app_unregister(int sock)
1287{
1288 struct ust_app *lta;
bec39940
DG
1289 struct lttng_ht_node_ulong *node;
1290 struct lttng_ht_iter iter;
525b0740 1291 int ret;
5b4a0ec0
DG
1292
1293 rcu_read_lock();
1294 lta = find_app_by_sock(sock);
1295 if (lta == NULL) {
1296 ERR("Unregister app sock %d not found!", sock);
1297 goto error;
1298 }
1299
1300 DBG("PID %d unregistering with sock %d", lta->key.pid, sock);
1301
1302 /* Get the node reference for a call_rcu */
bec39940
DG
1303 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) lta->key.pid), &iter);
1304 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
1305 if (node == NULL) {
1306 ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid);
1307 goto error;
1308 }
284d8f55 1309
bec39940 1310 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1311 assert(!ret);
5b4a0ec0 1312 call_rcu(&node->head, delete_ust_app_rcu);
284d8f55 1313error:
5b4a0ec0
DG
1314 rcu_read_unlock();
1315 return;
284d8f55
DG
1316}
1317
1318/*
5b4a0ec0 1319 * Return traceable_app_count
284d8f55 1320 */
5b4a0ec0 1321unsigned long ust_app_list_count(void)
284d8f55 1322{
5b4a0ec0 1323 unsigned long count;
284d8f55 1324
5b4a0ec0 1325 rcu_read_lock();
bec39940 1326 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 1327 rcu_read_unlock();
284d8f55 1328
5b4a0ec0 1329 return count;
284d8f55
DG
1330}
1331
5b4a0ec0
DG
1332/*
1333 * Fill events array with all events name of all registered apps.
1334 */
1335int ust_app_list_events(struct lttng_event **events)
421cb601 1336{
5b4a0ec0
DG
1337 int ret, handle;
1338 size_t nbmem, count = 0;
bec39940 1339 struct lttng_ht_iter iter;
5b4a0ec0
DG
1340 struct ust_app *app;
1341 struct lttng_event *tmp;
421cb601 1342
5b4a0ec0
DG
1343 nbmem = UST_APP_EVENT_LIST_SIZE;
1344 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1345 if (tmp == NULL) {
1346 PERROR("zmalloc ust app events");
1347 ret = -ENOMEM;
421cb601
DG
1348 goto error;
1349 }
1350
5b4a0ec0 1351 rcu_read_lock();
421cb601 1352
bec39940 1353 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
90eaa0d2 1354 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 1355
5b4a0ec0
DG
1356 handle = ustctl_tracepoint_list(app->key.sock);
1357 if (handle < 0) {
1358 ERR("UST app list events getting handle failed for app pid %d",
1359 app->key.pid);
1360 continue;
1361 }
421cb601 1362
5b4a0ec0 1363 while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle,
90eaa0d2 1364 &uiter)) != -ENOENT) {
815564d8
MD
1365 if (count >= nbmem) {
1366 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1367 2 * nbmem);
1368 nbmem *= 2;
2f221590 1369 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
5b4a0ec0
DG
1370 if (tmp == NULL) {
1371 PERROR("realloc ust app events");
1372 ret = -ENOMEM;
1373 goto rcu_error;
1374 }
1375 }
90eaa0d2
DG
1376 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1377 memcpy(tmp[count].loglevel, uiter.loglevel, LTTNG_UST_SYM_NAME_LEN);
1378 tmp[count].loglevel_value = uiter.loglevel_value;
5b4a0ec0
DG
1379 tmp[count].type = LTTNG_UST_TRACEPOINT;
1380 tmp[count].pid = app->key.pid;
1381 tmp[count].enabled = -1;
1382 count++;
421cb601 1383 }
421cb601
DG
1384 }
1385
5b4a0ec0
DG
1386 ret = count;
1387 *events = tmp;
421cb601 1388
5b4a0ec0 1389 DBG2("UST app list events done (%zu events)", count);
421cb601 1390
5b4a0ec0
DG
1391rcu_error:
1392 rcu_read_unlock();
421cb601 1393error:
5b4a0ec0 1394 return ret;
421cb601
DG
1395}
1396
5b4a0ec0
DG
1397/*
1398 * Free and clean all traceable apps of the global list.
1399 */
1400void ust_app_clean_list(void)
421cb601 1401{
5b4a0ec0 1402 int ret;
bec39940
DG
1403 struct lttng_ht_iter iter;
1404 struct lttng_ht_node_ulong *node;
421cb601 1405
5b4a0ec0 1406 DBG2("UST app cleaning registered apps hash table");
421cb601 1407
5b4a0ec0 1408 rcu_read_lock();
421cb601 1409
bec39940
DG
1410 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
1411 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1412 assert(!ret);
bec39940 1413 call_rcu(&node->head, delete_ust_app_rcu);
421cb601 1414 }
bec39940
DG
1415 /* Destroy is done only when the ht is empty */
1416 lttng_ht_destroy(ust_app_ht);
421cb601 1417
bec39940
DG
1418 cds_lfht_for_each_entry(ust_app_sock_key_map->ht, &iter.iter, node, node) {
1419 ret = lttng_ht_del(ust_app_sock_key_map, &iter);
1420 assert(!ret);
1421 }
1422 /* Destroy is done only when the ht is empty */
1423 lttng_ht_destroy(ust_app_sock_key_map);
421cb601 1424
5b4a0ec0
DG
1425 rcu_read_unlock();
1426}
1427
1428/*
1429 * Init UST app hash table.
1430 */
1431void ust_app_ht_alloc(void)
1432{
bec39940
DG
1433 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1434 ust_app_sock_key_map = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
1435}
1436
78f0bacd
DG
1437/*
1438 * For a specific UST session, disable the channel for all registered apps.
1439 */
35a9059d 1440int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1441 struct ltt_ust_channel *uchan)
1442{
1443 int ret = 0;
bec39940
DG
1444 struct lttng_ht_iter iter;
1445 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1446 struct ust_app *app;
1447 struct ust_app_session *ua_sess;
8535a6d9 1448 struct ust_app_channel *ua_chan;
78f0bacd
DG
1449
1450 if (usess == NULL || uchan == NULL) {
1451 ERR("Disabling UST global channel with NULL values");
1452 ret = -1;
1453 goto error;
1454 }
1455
a991f516
MD
1456 DBG2("UST app disabling channel %s from global domain for session id %d",
1457 uchan->name, usess->id);
78f0bacd
DG
1458
1459 rcu_read_lock();
1460
1461 /* For every registered applications */
bec39940
DG
1462 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1463 struct lttng_ht_iter uiter;
78f0bacd
DG
1464 ua_sess = lookup_session_by_app(usess, app);
1465 if (ua_sess == NULL) {
1466 continue;
1467 }
1468
8535a6d9 1469 /* Get channel */
bec39940
DG
1470 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1471 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
1472 /* If the session if found for the app, the channel must be there */
1473 assert(ua_chan_node);
1474
1475 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1476 /* The channel must not be already disabled */
1477 assert(ua_chan->enabled == 1);
1478
1479 /* Disable channel onto application */
1480 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
1481 if (ret < 0) {
1482 /* XXX: We might want to report this error at some point... */
1483 continue;
1484 }
1485 }
1486
1487 rcu_read_unlock();
1488
1489error:
1490 return ret;
1491}
1492
1493/*
1494 * For a specific UST session, enable the channel for all registered apps.
1495 */
35a9059d 1496int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1497 struct ltt_ust_channel *uchan)
1498{
1499 int ret = 0;
bec39940 1500 struct lttng_ht_iter iter;
78f0bacd
DG
1501 struct ust_app *app;
1502 struct ust_app_session *ua_sess;
1503
1504 if (usess == NULL || uchan == NULL) {
1505 ERR("Adding UST global channel to NULL values");
1506 ret = -1;
1507 goto error;
1508 }
1509
a991f516
MD
1510 DBG2("UST app enabling channel %s to global domain for session id %d",
1511 uchan->name, usess->id);
78f0bacd
DG
1512
1513 rcu_read_lock();
1514
1515 /* For every registered applications */
bec39940 1516 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
78f0bacd
DG
1517 ua_sess = lookup_session_by_app(usess, app);
1518 if (ua_sess == NULL) {
1519 continue;
1520 }
1521
1522 /* Enable channel onto application */
1523 ret = enable_ust_app_channel(ua_sess, uchan, app);
1524 if (ret < 0) {
1525 /* XXX: We might want to report this error at some point... */
1526 continue;
1527 }
1528 }
1529
1530 rcu_read_unlock();
1531
1532error:
1533 return ret;
1534}
1535
b0a40d28
DG
1536/*
1537 * Disable an event in a channel and for a specific session.
1538 */
35a9059d
DG
1539int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1540 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
1541{
1542 int ret = 0;
bec39940
DG
1543 struct lttng_ht_iter iter, uiter;
1544 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
b0a40d28
DG
1545 struct ust_app *app;
1546 struct ust_app_session *ua_sess;
1547 struct ust_app_channel *ua_chan;
1548 struct ust_app_event *ua_event;
1549
1550 DBG("UST app disabling event %s for all apps in channel "
a991f516 1551 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
1552
1553 rcu_read_lock();
1554
1555 /* For all registered applications */
bec39940 1556 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
b0a40d28
DG
1557 ua_sess = lookup_session_by_app(usess, app);
1558 if (ua_sess == NULL) {
1559 /* Next app */
1560 continue;
1561 }
1562
1563 /* Lookup channel in the ust app session */
bec39940
DG
1564 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1565 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 1566 if (ua_chan_node == NULL) {
a991f516
MD
1567 DBG2("Channel %s not found in session id %d for app pid %d."
1568 "Skipping", uchan->name, usess->id, app->key.pid);
b0a40d28
DG
1569 continue;
1570 }
1571 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1572
bec39940
DG
1573 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1574 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28
DG
1575 if (ua_event_node == NULL) {
1576 DBG2("Event %s not found in channel %s for app pid %d."
35a9059d 1577 "Skipping", uevent->attr.name, uchan->name, app->key.pid);
b0a40d28
DG
1578 continue;
1579 }
1580 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1581
7f79d3a1 1582 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
1583 if (ret < 0) {
1584 /* XXX: Report error someday... */
1585 continue;
1586 }
1587 }
1588
1589 rcu_read_unlock();
1590
1591 return ret;
1592}
1593
9730260e 1594/*
edb67388 1595 * For a specific UST session and UST channel, the event for all
9730260e
DG
1596 * registered apps.
1597 */
35a9059d 1598int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
9730260e
DG
1599 struct ltt_ust_channel *uchan)
1600{
1601 int ret = 0;
bec39940
DG
1602 struct lttng_ht_iter iter, uiter;
1603 struct lttng_ht_node_str *ua_chan_node;
9730260e
DG
1604 struct ust_app *app;
1605 struct ust_app_session *ua_sess;
1606 struct ust_app_channel *ua_chan;
1607 struct ust_app_event *ua_event;
1608
1609 DBG("UST app disabling all event for all apps in channel "
a991f516 1610 "%s for session id %d", uchan->name, usess->id);
9730260e
DG
1611
1612 rcu_read_lock();
1613
1614 /* For all registered applications */
bec39940 1615 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
9730260e 1616 ua_sess = lookup_session_by_app(usess, app);
edb67388
DG
1617 /* If ua_sess is NULL, there is a code flow error */
1618 assert(ua_sess);
9730260e
DG
1619
1620 /* Lookup channel in the ust app session */
bec39940
DG
1621 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1622 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1623 /* If the channel is not found, there is a code flow error */
1624 assert(ua_chan_node);
1625
9730260e
DG
1626 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1627
1628 /* Disable each events of channel */
bec39940
DG
1629 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1630 node.node) {
7f79d3a1 1631 ret = disable_ust_app_event(ua_sess, ua_event, app);
9730260e
DG
1632 if (ret < 0) {
1633 /* XXX: Report error someday... */
1634 continue;
1635 }
1636 }
1637 }
1638
1639 rcu_read_unlock();
1640
1641 return ret;
1642}
1643
421cb601 1644/*
5b4a0ec0 1645 * For a specific UST session, create the channel for all registered apps.
421cb601 1646 */
35a9059d 1647int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
1648 struct ltt_ust_channel *uchan)
1649{
1650 int ret = 0;
bec39940 1651 struct lttng_ht_iter iter;
48842b30
DG
1652 struct ust_app *app;
1653 struct ust_app_session *ua_sess;
1654 struct ust_app_channel *ua_chan;
1655
421cb601
DG
1656 if (usess == NULL || uchan == NULL) {
1657 ERR("Adding UST global channel to NULL values");
1658 ret = -1;
1659 goto error;
1660 }
1661
a991f516
MD
1662 DBG2("UST app adding channel %s to global domain for session id %d",
1663 uchan->name, usess->id);
48842b30
DG
1664
1665 rcu_read_lock();
421cb601 1666
5b4a0ec0 1667 /* For every registered applications */
bec39940 1668 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
edb67388
DG
1669 /*
1670 * Create session on the tracer side and add it to app session HT. Note
1671 * that if session exist, it will simply return a pointer to the ust
1672 * app session.
1673 */
421cb601 1674 ua_sess = create_ust_app_session(usess, app);
509cbaf8 1675 if (ua_sess == NULL) {
5b4a0ec0 1676 continue;
48842b30
DG
1677 }
1678
421cb601
DG
1679 /* Create channel onto application */
1680 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
1681 if (ua_chan == NULL) {
5b4a0ec0 1682 continue;
48842b30 1683 }
48842b30 1684 }
5b4a0ec0 1685
48842b30
DG
1686 rcu_read_unlock();
1687
421cb601 1688error:
48842b30
DG
1689 return ret;
1690}
1691
5b4a0ec0 1692/*
edb67388 1693 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 1694 */
35a9059d 1695int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
1696 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1697{
1698 int ret = 0;
bec39940
DG
1699 struct lttng_ht_iter iter, uiter;
1700 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
48842b30
DG
1701 struct ust_app *app;
1702 struct ust_app_session *ua_sess;
1703 struct ust_app_channel *ua_chan;
1704 struct ust_app_event *ua_event;
48842b30 1705
a991f516
MD
1706 DBG("UST app enabling event %s for all apps for session id %d",
1707 uevent->attr.name, usess->id);
48842b30 1708
edb67388
DG
1709 /*
1710 * NOTE: At this point, this function is called only if the session and
1711 * channel passed are already created for all apps. and enabled on the
1712 * tracer also.
1713 */
1714
48842b30 1715 rcu_read_lock();
421cb601
DG
1716
1717 /* For all registered applications */
bec39940 1718 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
edb67388
DG
1719 ua_sess = lookup_session_by_app(usess, app);
1720 /* If ua_sess is NULL, there is a code flow error */
1721 assert(ua_sess);
ba767faf 1722
edb67388 1723 /* Lookup channel in the ust app session */
bec39940
DG
1724 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1725 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1726 /* If the channel is not found, there is a code flow error */
1727 assert(ua_chan_node);
1728
1729 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1730
bec39940
DG
1731 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
1732 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
35a9059d 1733 if (ua_event_node == NULL) {
7f79d3a1
DG
1734 DBG3("UST app enable event %s not found for app PID %d."
1735 "Skipping app", uevent->attr.name, app->key.pid);
35a9059d
DG
1736 continue;
1737 }
1738 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1739
1740 ret = enable_ust_app_event(ua_sess, ua_event, app);
1741 if (ret < 0) {
7f79d3a1 1742 goto error;
48842b30 1743 }
edb67388
DG
1744 }
1745
7f79d3a1 1746error:
edb67388 1747 rcu_read_unlock();
edb67388
DG
1748 return ret;
1749}
1750
1751/*
1752 * For a specific existing UST session and UST channel, creates the event for
1753 * all registered apps.
1754 */
35a9059d 1755int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
1756 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1757{
1758 int ret = 0;
bec39940
DG
1759 struct lttng_ht_iter iter, uiter;
1760 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
1761 struct ust_app *app;
1762 struct ust_app_session *ua_sess;
1763 struct ust_app_channel *ua_chan;
1764
a991f516
MD
1765 DBG("UST app creating event %s for all apps for session id %d",
1766 uevent->attr.name, usess->id);
edb67388
DG
1767
1768 /*
1769 * NOTE: At this point, this function is called only if the session and
1770 * channel passed are already created for all apps. and enabled on the
1771 * tracer also.
1772 */
1773
1774 rcu_read_lock();
1775
1776 /* For all registered applications */
bec39940 1777 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
edb67388
DG
1778 ua_sess = lookup_session_by_app(usess, app);
1779 /* If ua_sess is NULL, there is a code flow error */
1780 assert(ua_sess);
48842b30
DG
1781
1782 /* Lookup channel in the ust app session */
bec39940
DG
1783 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1784 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1785 /* If the channel is not found, there is a code flow error */
1786 assert(ua_chan_node);
1787
48842b30
DG
1788 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1789
edb67388
DG
1790 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
1791 if (ret < 0) {
5b4a0ec0 1792 continue;
48842b30 1793 }
48842b30 1794 }
5b4a0ec0 1795
48842b30
DG
1796 rcu_read_unlock();
1797
1798 return ret;
1799}
1800
5b4a0ec0
DG
1801/*
1802 * Start tracing for a specific UST session and app.
1803 */
421cb601 1804int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
1805{
1806 int ret = 0;
bec39940 1807 struct lttng_ht_iter iter;
48842b30
DG
1808 struct ust_app_session *ua_sess;
1809 struct ust_app_channel *ua_chan;
5b4a0ec0 1810 struct ltt_ust_stream *ustream;
7753dea8 1811 int consumerd_fd;
48842b30 1812
421cb601 1813 DBG("Starting tracing for ust app pid %d", app->key.pid);
5cf5d0e7 1814
509cbaf8
MD
1815 rcu_read_lock();
1816
421cb601
DG
1817 ua_sess = lookup_session_by_app(usess, app);
1818 if (ua_sess == NULL) {
509cbaf8 1819 goto error_rcu_unlock;
421cb601 1820 }
48842b30 1821
aea829b3
DG
1822 /* Upon restart, we skip the setup, already done */
1823 if (ua_sess->started) {
8be98f9a 1824 goto skip_setup;
aea829b3 1825 }
8be98f9a 1826
421cb601
DG
1827 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
1828 if (ret < 0) {
509cbaf8 1829 goto error_rcu_unlock;
421cb601 1830 }
48842b30 1831
421cb601 1832 /* For each channel */
bec39940
DG
1833 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
1834 node.node) {
421cb601
DG
1835 /* Create all streams */
1836 while (1) {
5b4a0ec0 1837 /* Create UST stream */
421cb601
DG
1838 ustream = zmalloc(sizeof(*ustream));
1839 if (ustream == NULL) {
1840 PERROR("zmalloc ust stream");
509cbaf8 1841 goto error_rcu_unlock;
421cb601 1842 }
48842b30 1843
421cb601
DG
1844 ret = ustctl_create_stream(app->key.sock, ua_chan->obj,
1845 &ustream->obj);
48842b30 1846 if (ret < 0) {
421cb601
DG
1847 /* Got all streams */
1848 break;
48842b30 1849 }
421cb601 1850 ustream->handle = ustream->obj->handle;
48842b30 1851
421cb601
DG
1852 /* Order is important */
1853 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
477d7741
MD
1854 ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
1855 ua_sess->path, ua_chan->name,
1856 ua_chan->streams.count++);
aba8e916
DG
1857 if (ret < 0) {
1858 PERROR("asprintf UST create stream");
421cb601 1859 continue;
aba8e916 1860 }
421cb601
DG
1861 DBG2("UST stream %d ready at %s", ua_chan->streams.count,
1862 ustream->pathname);
1863 }
421cb601 1864 }
aba8e916 1865
7753dea8
MD
1866 switch (app->bits_per_long) {
1867 case 64:
1868 consumerd_fd = ust_consumerd64_fd;
1869 break;
1870 case 32:
1871 consumerd_fd = ust_consumerd32_fd;
1872 break;
1873 default:
1874 ret = -EINVAL;
1875 goto error_rcu_unlock;
1876 }
aea829b3 1877
421cb601 1878 /* Setup UST consumer socket and send fds to it */
7753dea8 1879 ret = ust_consumer_send_session(consumerd_fd, ua_sess);
421cb601 1880 if (ret < 0) {
509cbaf8 1881 goto error_rcu_unlock;
421cb601 1882 }
8be98f9a 1883 ua_sess->started = 1;
48842b30 1884
8be98f9a 1885skip_setup:
421cb601
DG
1886 /* This start the UST tracing */
1887 ret = ustctl_start_session(app->key.sock, ua_sess->handle);
1888 if (ret < 0) {
1889 ERR("Error starting tracing for app pid: %d", app->key.pid);
509cbaf8 1890 goto error_rcu_unlock;
421cb601 1891 }
5b4a0ec0 1892
509cbaf8 1893 rcu_read_unlock();
48842b30 1894
421cb601
DG
1895 /* Quiescent wait after starting trace */
1896 ustctl_wait_quiescent(app->key.sock);
48842b30 1897
421cb601 1898 return 0;
48842b30 1899
509cbaf8
MD
1900error_rcu_unlock:
1901 rcu_read_unlock();
421cb601
DG
1902 return -1;
1903}
48842b30 1904
8be98f9a
MD
1905/*
1906 * Stop tracing for a specific UST session and app.
1907 */
1908int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
1909{
1910 int ret = 0;
bec39940 1911 struct lttng_ht_iter iter;
8be98f9a 1912 struct ust_app_session *ua_sess;
6d3686da 1913 struct ust_app_channel *ua_chan;
8be98f9a
MD
1914
1915 DBG("Stopping tracing for ust app pid %d", app->key.pid);
1916
1917 rcu_read_lock();
1918
1919 ua_sess = lookup_session_by_app(usess, app);
1920 if (ua_sess == NULL) {
1921 /* Only malloc can failed so something is really wrong */
1922 goto error_rcu_unlock;
1923 }
1924
9d6c7d3f
DG
1925 /* This inhibits UST tracing */
1926 ret = ustctl_stop_session(app->key.sock, ua_sess->handle);
1927 if (ret < 0) {
1928 ERR("Error stopping tracing for app pid: %d", app->key.pid);
1929 goto error_rcu_unlock;
1930 }
1931
1932 /* Quiescent wait after stopping trace */
1933 ustctl_wait_quiescent(app->key.sock);
1934
1935 /* Flushing buffers */
bec39940
DG
1936 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
1937 node.node) {
6d3686da 1938 ret = ustctl_sock_flush_buffer(app->key.sock, ua_chan->obj);
8be98f9a 1939 if (ret < 0) {
6d3686da
DG
1940 ERR("UST app PID %d channel %s flush failed",
1941 app->key.pid, ua_chan->name);
1942 ERR("Ended with ret %d", ret);
1943 /* Continuing flushing all buffers */
1944 continue;
8be98f9a
MD
1945 }
1946 }
8be98f9a 1947
90d97d10
DG
1948 /* Flush all buffers before stopping */
1949 ret = ustctl_sock_flush_buffer(app->key.sock, ua_sess->metadata->obj);
1950 if (ret < 0) {
1951 ERR("UST app PID %d metadata flush failed", app->key.pid);
1952 ERR("Ended with ret %d", ret);
1953 }
1954
9d6c7d3f
DG
1955 rcu_read_unlock();
1956
8be98f9a
MD
1957 return 0;
1958
1959error_rcu_unlock:
1960 rcu_read_unlock();
1961 return -1;
1962}
1963
84cd17c6
MD
1964/*
1965 * Destroy a specific UST session in apps.
1966 */
1967int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
1968{
1969 struct ust_app_session *ua_sess;
1970 struct lttng_ust_object_data obj;
bec39940
DG
1971 struct lttng_ht_iter iter;
1972 struct lttng_ht_node_ulong *node;
525b0740 1973 int ret;
84cd17c6
MD
1974
1975 DBG("Destroy tracing for ust app pid %d", app->key.pid);
1976
1977 rcu_read_lock();
1978
1979 __lookup_session_by_app(usess, app, &iter);
bec39940 1980 node = lttng_ht_iter_get_node_ulong(&iter);
84cd17c6
MD
1981 if (node == NULL) {
1982 /* Only malloc can failed so something is really wrong */
1983 goto error_rcu_unlock;
1984 }
1985 ua_sess = caa_container_of(node, struct ust_app_session, node);
bec39940 1986 ret = lttng_ht_del(app->sessions, &iter);
525b0740 1987 assert(!ret);
84cd17c6
MD
1988 delete_ust_app_session(app->key.sock, ua_sess);
1989 obj.handle = ua_sess->handle;
1990 obj.shm_fd = -1;
1991 obj.wait_fd = -1;
1992 obj.memory_map_size = 0;
1993 ustctl_release_object(app->key.sock, &obj);
1994
1995 rcu_read_unlock();
1996
1997 /* Quiescent wait after stopping trace */
1998 ustctl_wait_quiescent(app->key.sock);
1999
2000 return 0;
2001
2002error_rcu_unlock:
2003 rcu_read_unlock();
2004 return -1;
2005}
2006
5b4a0ec0
DG
2007/*
2008 * Start tracing for the UST session.
2009 */
421cb601
DG
2010int ust_app_start_trace_all(struct ltt_ust_session *usess)
2011{
2012 int ret = 0;
bec39940 2013 struct lttng_ht_iter iter;
421cb601 2014 struct ust_app *app;
48842b30 2015
421cb601
DG
2016 DBG("Starting all UST traces");
2017
2018 rcu_read_lock();
421cb601 2019
bec39940 2020 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
421cb601 2021 ret = ust_app_start_trace(usess, app);
48842b30 2022 if (ret < 0) {
5b4a0ec0
DG
2023 /* Continue to next apps even on error */
2024 continue;
48842b30 2025 }
48842b30 2026 }
5b4a0ec0 2027
48842b30
DG
2028 rcu_read_unlock();
2029
2030 return 0;
2031}
487cf67c 2032
8be98f9a
MD
2033/*
2034 * Start tracing for the UST session.
2035 */
2036int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2037{
2038 int ret = 0;
bec39940 2039 struct lttng_ht_iter iter;
8be98f9a
MD
2040 struct ust_app *app;
2041
2042 DBG("Stopping all UST traces");
2043
2044 rcu_read_lock();
2045
bec39940 2046 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
8be98f9a
MD
2047 ret = ust_app_stop_trace(usess, app);
2048 if (ret < 0) {
2049 /* Continue to next apps even on error */
2050 continue;
2051 }
2052 }
2053
2054 rcu_read_unlock();
2055
2056 return 0;
2057}
2058
84cd17c6
MD
2059/*
2060 * Destroy app UST session.
2061 */
2062int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2063{
2064 int ret = 0;
bec39940 2065 struct lttng_ht_iter iter;
84cd17c6
MD
2066 struct ust_app *app;
2067
2068 DBG("Destroy all UST traces");
2069
2070 rcu_read_lock();
2071
bec39940 2072 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
84cd17c6
MD
2073 ret = ust_app_destroy_trace(usess, app);
2074 if (ret < 0) {
2075 /* Continue to next apps even on error */
2076 continue;
2077 }
2078 }
2079
2080 rcu_read_unlock();
2081
2082 return 0;
2083}
2084
5b4a0ec0
DG
2085/*
2086 * Add channels/events from UST global domain to registered apps at sock.
2087 */
487cf67c
DG
2088void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2089{
2090 int ret = 0;
bec39940 2091 struct lttng_ht_iter iter, uiter;
487cf67c
DG
2092 struct ust_app *app;
2093 struct ust_app_session *ua_sess;
2094 struct ust_app_channel *ua_chan;
2095 struct ust_app_event *ua_event;
1f3580c7
DG
2096
2097 if (usess == NULL) {
5b4a0ec0 2098 ERR("No UST session on global update. Returning");
1f3580c7
DG
2099 goto error;
2100 }
2101
a991f516
MD
2102 DBG2("UST app global update for app sock %d for session id %d", sock,
2103 usess->id);
487cf67c 2104
284d8f55
DG
2105 rcu_read_lock();
2106
487cf67c
DG
2107 app = find_app_by_sock(sock);
2108 if (app == NULL) {
2109 ERR("Failed to update app sock %d", sock);
2110 goto error;
2111 }
2112
421cb601 2113 ua_sess = create_ust_app_session(usess, app);
487cf67c 2114 if (ua_sess == NULL) {
487cf67c
DG
2115 goto error;
2116 }
2117
284d8f55
DG
2118 /*
2119 * We can iterate safely here over all UST app session sicne the create ust
2120 * app session above made a shadow copy of the UST global domain from the
2121 * ltt ust session.
2122 */
bec39940
DG
2123 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2124 node.node) {
284d8f55
DG
2125 ret = create_ust_channel(app, ua_sess, ua_chan);
2126 if (ret < 0) {
2127 /* FIXME: Should we quit here or continue... */
2128 continue;
487cf67c
DG
2129 }
2130
284d8f55 2131 /* For each events */
bec39940
DG
2132 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2133 node.node) {
284d8f55
DG
2134 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2135 if (ret < 0) {
2136 /* FIXME: Should we quit here or continue... */
2137 continue;
487cf67c 2138 }
36dc12cc 2139 }
487cf67c
DG
2140 }
2141
36dc12cc 2142 if (usess->start_trace) {
421cb601 2143 ret = ust_app_start_trace(usess, app);
36dc12cc 2144 if (ret < 0) {
36dc12cc
DG
2145 goto error;
2146 }
2147
36dc12cc
DG
2148 DBG2("UST trace started for app pid %d", app->key.pid);
2149 }
2150
487cf67c
DG
2151error:
2152 rcu_read_unlock();
2153 return;
2154}
55cc08a6
DG
2155
2156/*
2157 * Add context to a specific channel for global UST domain.
2158 */
2159int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2160 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2161{
2162 int ret = 0;
bec39940
DG
2163 struct lttng_ht_node_str *ua_chan_node;
2164 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2165 struct ust_app_channel *ua_chan = NULL;
2166 struct ust_app_session *ua_sess;
2167 struct ust_app *app;
2168
2169 rcu_read_lock();
2170
bec39940 2171 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
55cc08a6
DG
2172 ua_sess = lookup_session_by_app(usess, app);
2173 if (ua_sess == NULL) {
2174 continue;
2175 }
2176
2177 /* Lookup channel in the ust app session */
bec39940
DG
2178 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2179 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2180 if (ua_chan_node == NULL) {
2181 continue;
2182 }
2183 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2184 node);
2185
2186 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2187 if (ret < 0) {
2188 continue;
2189 }
2190 }
2191
55cc08a6
DG
2192 rcu_read_unlock();
2193 return ret;
2194}
2195
2196/*
2197 * Add context to a specific event in a channel for global UST domain.
2198 */
2199int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2200 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2201 struct ltt_ust_context *uctx)
2202{
2203 int ret = 0;
bec39940
DG
2204 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2205 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2206 struct ust_app_session *ua_sess;
2207 struct ust_app_event *ua_event;
2208 struct ust_app_channel *ua_chan = NULL;
2209 struct ust_app *app;
2210
2211 rcu_read_lock();
2212
bec39940 2213 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
55cc08a6
DG
2214 ua_sess = lookup_session_by_app(usess, app);
2215 if (ua_sess == NULL) {
2216 continue;
2217 }
2218
2219 /* Lookup channel in the ust app session */
bec39940
DG
2220 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2221 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2222 if (ua_chan_node == NULL) {
2223 continue;
2224 }
2225 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2226 node);
2227
bec39940
DG
2228 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2229 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2230 if (ua_event_node == NULL) {
2231 continue;
2232 }
2233 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2234 node);
2235
2236 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2237 if (ret < 0) {
2238 continue;
2239 }
2240 }
2241
55cc08a6
DG
2242 rcu_read_unlock();
2243 return ret;
2244}
76d45b40
DG
2245
2246/*
2247 * Enable event for a channel from a UST session for a specific PID.
2248 */
2249int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2250 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2251{
2252 int ret = 0;
bec39940
DG
2253 struct lttng_ht_iter iter;
2254 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
76d45b40
DG
2255 struct ust_app *app;
2256 struct ust_app_session *ua_sess;
2257 struct ust_app_channel *ua_chan;
2258 struct ust_app_event *ua_event;
2259
2260 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2261
2262 rcu_read_lock();
2263
2264 app = ust_app_find_by_pid(pid);
2265 if (app == NULL) {
2266 ERR("UST app enable event per PID %d not found", pid);
2267 ret = -1;
2268 goto error;
2269 }
2270
2271 ua_sess = lookup_session_by_app(usess, app);
2272 /* If ua_sess is NULL, there is a code flow error */
2273 assert(ua_sess);
2274
2275 /* Lookup channel in the ust app session */
bec39940
DG
2276 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2277 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2278 /* If the channel is not found, there is a code flow error */
2279 assert(ua_chan_node);
2280
2281 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2282
bec39940
DG
2283 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2284 ua_event_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2285 if (ua_event_node == NULL) {
2286 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2287 if (ret < 0) {
2288 goto error;
2289 }
2290 } else {
2291 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2292
2293 ret = enable_ust_app_event(ua_sess, ua_event, app);
2294 if (ret < 0) {
2295 goto error;
2296 }
2297 }
2298
2299error:
2300 rcu_read_unlock();
2301 return ret;
2302}
7f79d3a1
DG
2303
2304/*
2305 * Disable event for a channel from a UST session for a specific PID.
2306 */
2307int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2308 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2309{
2310 int ret = 0;
bec39940
DG
2311 struct lttng_ht_iter iter;
2312 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
7f79d3a1
DG
2313 struct ust_app *app;
2314 struct ust_app_session *ua_sess;
2315 struct ust_app_channel *ua_chan;
2316 struct ust_app_event *ua_event;
2317
2318 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2319
2320 rcu_read_lock();
2321
2322 app = ust_app_find_by_pid(pid);
2323 if (app == NULL) {
2324 ERR("UST app disable event per PID %d not found", pid);
2325 ret = -1;
2326 goto error;
2327 }
2328
2329 ua_sess = lookup_session_by_app(usess, app);
2330 /* If ua_sess is NULL, there is a code flow error */
2331 assert(ua_sess);
2332
2333 /* Lookup channel in the ust app session */
bec39940
DG
2334 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2335 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2336 if (ua_chan_node == NULL) {
2337 /* Channel does not exist, skip disabling */
2338 goto error;
2339 }
2340 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2341
bec39940
DG
2342 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2343 ua_event_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2344 if (ua_event_node == NULL) {
2345 /* Event does not exist, skip disabling */
2346 goto error;
2347 }
2348 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2349
2350 ret = disable_ust_app_event(ua_sess, ua_event, app);
2351 if (ret < 0) {
2352 goto error;
2353 }
2354
2355error:
2356 rcu_read_unlock();
2357 return ret;
2358}
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