Fix unhandled return value
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c
CommitLineData
91d76f53
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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
82a3637f
DG
6 * as published by the Free Software Foundation; only version 2
7 * of the License.
91d76f53
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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>
0df502fd 28#include <urcu/compiler.h>
bec39940 29
990570ed 30#include <common/common.h>
1e307fab 31
56fff090 32#include "ust-app.h"
48842b30 33#include "ust-consumer.h"
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34#include "ust-ctl.h"
35
55cc08a6
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36/*
37 * Delete ust context safely. RCU read lock must be held before calling
38 * this function.
39 */
40static
41void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
42{
43 if (ua_ctx->obj) {
44 ustctl_release_object(sock, ua_ctx->obj);
45 free(ua_ctx->obj);
46 }
47 free(ua_ctx);
48}
49
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50/*
51 * Delete ust app event safely. RCU read lock must be held before calling
52 * this function.
53 */
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54static
55void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
d80a6244 56{
55cc08a6 57 int ret;
bec39940 58 struct lttng_ht_iter iter;
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59 struct ust_app_ctx *ua_ctx;
60
fc34caaa 61 /* Destroy each context of event */
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62 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter.iter, ua_ctx,
63 node.node) {
64 ret = lttng_ht_del(ua_event->ctx, &iter);
55cc08a6
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65 assert(!ret);
66 delete_ust_app_ctx(sock, ua_ctx);
67 }
bec39940 68 lttng_ht_destroy(ua_event->ctx);
d80a6244 69
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70 if (ua_event->obj != NULL) {
71 ustctl_release_object(sock, ua_event->obj);
72 free(ua_event->obj);
73 }
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74 free(ua_event);
75}
76
77/*
78 * Delete ust app stream safely. RCU read lock must be held before calling
79 * this function.
80 */
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81static
82void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
d80a6244 83{
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84 if (stream->obj) {
85 ustctl_release_object(sock, stream->obj);
86 free(stream->obj);
87 }
84cd17c6 88 free(stream);
d80a6244
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89}
90
91/*
92 * Delete ust app channel safely. RCU read lock must be held before calling
93 * this function.
94 */
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95static
96void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
d80a6244
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97{
98 int ret;
bec39940 99 struct lttng_ht_iter iter;
d80a6244 100 struct ust_app_event *ua_event;
55cc08a6 101 struct ust_app_ctx *ua_ctx;
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102 struct ltt_ust_stream *stream, *stmp;
103
55cc08a6 104 /* Wipe stream */
d80a6244 105 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 106 cds_list_del(&stream->list);
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107 delete_ust_app_stream(sock, stream);
108 }
109
55cc08a6 110 /* Wipe context */
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111 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
112 ret = lttng_ht_del(ua_chan->ctx, &iter);
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113 assert(!ret);
114 delete_ust_app_ctx(sock, ua_ctx);
115 }
bec39940 116 lttng_ht_destroy(ua_chan->ctx);
d80a6244 117
55cc08a6 118 /* Wipe events */
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119 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
120 node.node) {
121 ret = lttng_ht_del(ua_chan->events, &iter);
525b0740 122 assert(!ret);
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123 delete_ust_app_event(sock, ua_event);
124 }
bec39940 125 lttng_ht_destroy(ua_chan->events);
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126
127 if (ua_chan->obj != NULL) {
128 ustctl_release_object(sock, ua_chan->obj);
129 free(ua_chan->obj);
130 }
84cd17c6 131 free(ua_chan);
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132}
133
134/*
135 * Delete ust app session safely. RCU read lock must be held before calling
136 * this function.
137 */
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138static
139void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
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140{
141 int ret;
bec39940 142 struct lttng_ht_iter iter;
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143 struct ust_app_channel *ua_chan;
144
145 if (ua_sess->metadata) {
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146 if (ua_sess->metadata->stream_obj) {
147 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
148 free(ua_sess->metadata->stream_obj);
149 }
150 if (ua_sess->metadata->obj) {
151 ustctl_release_object(sock, ua_sess->metadata->obj);
152 free(ua_sess->metadata->obj);
153 }
d80a6244
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154 }
155
bec39940
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156 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
157 node.node) {
158 ret = lttng_ht_del(ua_sess->channels, &iter);
525b0740 159 assert(!ret);
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160 delete_ust_app_channel(sock, ua_chan);
161 }
bec39940 162 lttng_ht_destroy(ua_sess->channels);
d80a6244 163
aee6bafd
MD
164 if (ua_sess->handle != -1) {
165 ustctl_release_handle(sock, ua_sess->handle);
166 }
8b366481 167 free(ua_sess);
d80a6244 168}
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169
170/*
284d8f55
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171 * Delete a traceable application structure from the global list. Never call
172 * this function outside of a call_rcu call.
91d76f53 173 */
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174static
175void delete_ust_app(struct ust_app *app)
91d76f53 176{
8b366481 177 int ret, sock;
bec39940 178 struct lttng_ht_iter iter;
284d8f55 179 struct ust_app_session *ua_sess;
44d3bd01 180
f6a9efaa 181 rcu_read_lock();
44d3bd01 182
d80a6244 183 /* Delete ust app sessions info */
6414a713
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184 sock = app->key.sock;
185 app->key.sock = -1;
d80a6244 186
8b366481 187 /* Wipe sessions */
bec39940
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188 cds_lfht_for_each_entry(app->sessions->ht, &iter.iter, ua_sess,
189 node.node) {
190 ret = lttng_ht_del(app->sessions, &iter);
525b0740 191 assert(!ret);
284d8f55 192 delete_ust_app_session(app->key.sock, ua_sess);
d80a6244 193 }
bec39940 194 lttng_ht_destroy(app->sessions);
d80a6244 195
6414a713 196 /*
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197 * Wait until we have removed the key from the sock hash table before
198 * closing this socket, otherwise an application could re-use the socket ID
199 * and race with the teardown, using the same hash table entry.
6414a713
MD
200 */
201 close(sock);
d80a6244 202
284d8f55
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203 DBG2("UST app pid %d deleted", app->key.pid);
204 free(app);
bec39940 205
f6a9efaa 206 rcu_read_unlock();
099e26bd
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207}
208
209/*
f6a9efaa 210 * URCU intermediate call to delete an UST app.
099e26bd 211 */
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212static
213void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 214{
bec39940
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215 struct lttng_ht_node_ulong *node =
216 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa
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217 struct ust_app *app =
218 caa_container_of(node, struct ust_app, node);
219
bec39940 220 DBG3("Call RCU deleting app PID %d", app->key.pid);
f6a9efaa 221 delete_ust_app(app);
099e26bd
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222}
223
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224/*
225 * Alloc new UST app session.
226 */
227static
228struct ust_app_session *alloc_ust_app_session(void)
229{
230 struct ust_app_session *ua_sess;
231
232 /* Init most of the default value by allocating and zeroing */
233 ua_sess = zmalloc(sizeof(struct ust_app_session));
234 if (ua_sess == NULL) {
235 PERROR("malloc");
236 goto error;
237 }
238
239 ua_sess->handle = -1;
bec39940 240 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
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241
242 return ua_sess;
243
244error:
245 return NULL;
246}
247
248/*
249 * Alloc new UST app channel.
250 */
251static
252struct ust_app_channel *alloc_ust_app_channel(char *name,
253 struct lttng_ust_channel *attr)
254{
255 struct ust_app_channel *ua_chan;
256
257 /* Init most of the default value by allocating and zeroing */
258 ua_chan = zmalloc(sizeof(struct ust_app_channel));
259 if (ua_chan == NULL) {
260 PERROR("malloc");
261 goto error;
262 }
263
264 /* Setup channel name */
265 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
266 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
267
268 ua_chan->enabled = 1;
269 ua_chan->handle = -1;
bec39940
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270 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
271 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
272 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
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273
274 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
275
276 /* Copy attributes */
277 if (attr) {
278 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
279 }
280
281 DBG3("UST app channel %s allocated", ua_chan->name);
282
283 return ua_chan;
284
285error:
286 return NULL;
287}
288
289/*
290 * Alloc new UST app event.
291 */
292static
293struct ust_app_event *alloc_ust_app_event(char *name,
294 struct lttng_ust_event *attr)
295{
296 struct ust_app_event *ua_event;
297
298 /* Init most of the default value by allocating and zeroing */
299 ua_event = zmalloc(sizeof(struct ust_app_event));
300 if (ua_event == NULL) {
301 PERROR("malloc");
302 goto error;
303 }
304
305 ua_event->enabled = 1;
306 strncpy(ua_event->name, name, sizeof(ua_event->name));
307 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
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DG
308 ua_event->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
309 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
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310
311 /* Copy attributes */
312 if (attr) {
313 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
314 }
315
316 DBG3("UST app event %s allocated", ua_event->name);
317
318 return ua_event;
319
320error:
321 return NULL;
322}
323
324/*
325 * Alloc new UST app context.
326 */
327static
328struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
329{
330 struct ust_app_ctx *ua_ctx;
331
332 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
333 if (ua_ctx == NULL) {
334 goto error;
335 }
336
337 if (uctx) {
338 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
339 }
340
341 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
342
343error:
344 return ua_ctx;
345}
346
099e26bd 347/*
421cb601
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348 * Find an ust_app using the sock and return it. RCU read side lock must be
349 * held before calling this helper function.
099e26bd 350 */
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351static
352struct ust_app *find_app_by_sock(int sock)
099e26bd 353{
bec39940 354 struct lttng_ht_node_ulong *node;
f6a9efaa 355 struct ust_app_key *key;
bec39940 356 struct lttng_ht_iter iter;
f6a9efaa 357
bec39940
DG
358 lttng_ht_lookup(ust_app_sock_key_map, (void *)((unsigned long) sock),
359 &iter);
360 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
361 if (node == NULL) {
362 DBG2("UST app find by sock %d key not found", sock);
f6a9efaa
DG
363 goto error;
364 }
f6a9efaa
DG
365 key = caa_container_of(node, struct ust_app_key, node);
366
bec39940
DG
367 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) key->pid), &iter);
368 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
369 if (node == NULL) {
370 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
371 goto error;
372 }
f6a9efaa
DG
373 return caa_container_of(node, struct ust_app, node);
374
375error:
376 return NULL;
099e26bd
DG
377}
378
55cc08a6
DG
379/*
380 * Create the channel context on the tracer.
381 */
382static
383int create_ust_channel_context(struct ust_app_channel *ua_chan,
384 struct ust_app_ctx *ua_ctx, struct ust_app *app)
385{
386 int ret;
387
388 ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
389 ua_chan->obj, &ua_ctx->obj);
390 if (ret < 0) {
391 goto error;
392 }
393
394 ua_ctx->handle = ua_ctx->obj->handle;
395
396 DBG2("UST app context added to channel %s successfully", ua_chan->name);
397
398error:
399 return ret;
400}
401
402/*
403 * Create the event context on the tracer.
404 */
405static
406int create_ust_event_context(struct ust_app_event *ua_event,
407 struct ust_app_ctx *ua_ctx, struct ust_app *app)
408{
409 int ret;
410
411 ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
412 ua_event->obj, &ua_ctx->obj);
413 if (ret < 0) {
414 goto error;
415 }
416
417 ua_ctx->handle = ua_ctx->obj->handle;
418
419 DBG2("UST app context added to event %s successfully", ua_event->name);
420
421error:
422 return ret;
423}
424
9730260e
DG
425/*
426 * Disable the specified event on to UST tracer for the UST session.
427 */
428static int disable_ust_event(struct ust_app *app,
429 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
430{
431 int ret;
432
433 ret = ustctl_disable(app->key.sock, ua_event->obj);
434 if (ret < 0) {
435 ERR("UST app event %s disable failed for app (pid: %d) "
436 "and session handle %d with ret %d",
437 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
438 goto error;
439 }
440
441 DBG2("UST app event %s disabled successfully for app (pid: %d)",
442 ua_event->attr.name, app->key.pid);
443
444error:
445 return ret;
446}
447
78f0bacd
DG
448/*
449 * Disable the specified channel on to UST tracer for the UST session.
450 */
451static int disable_ust_channel(struct ust_app *app,
452 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
453{
454 int ret;
455
456 ret = ustctl_disable(app->key.sock, ua_chan->obj);
457 if (ret < 0) {
458 ERR("UST app channel %s disable failed for app (pid: %d) "
459 "and session handle %d with ret %d",
460 ua_chan->name, app->key.pid, ua_sess->handle, ret);
461 goto error;
462 }
463
78f0bacd
DG
464 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
465 ua_chan->name, app->key.pid);
466
467error:
468 return ret;
469}
470
471/*
472 * Enable the specified channel on to UST tracer for the UST session.
473 */
474static int enable_ust_channel(struct ust_app *app,
475 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
476{
477 int ret;
478
479 ret = ustctl_enable(app->key.sock, ua_chan->obj);
480 if (ret < 0) {
481 ERR("UST app channel %s enable failed for app (pid: %d) "
482 "and session handle %d with ret %d",
483 ua_chan->name, app->key.pid, ua_sess->handle, ret);
484 goto error;
485 }
486
487 ua_chan->enabled = 1;
488
489 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
490 ua_chan->name, app->key.pid);
491
492error:
493 return ret;
494}
495
edb67388
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496/*
497 * Enable the specified event on to UST tracer for the UST session.
498 */
499static int enable_ust_event(struct ust_app *app,
500 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
501{
502 int ret;
503
504 ret = ustctl_enable(app->key.sock, ua_event->obj);
505 if (ret < 0) {
506 ERR("UST app event %s enable failed for app (pid: %d) "
507 "and session handle %d with ret %d",
508 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
509 goto error;
510 }
511
512 DBG2("UST app event %s enabled successfully for app (pid: %d)",
513 ua_event->attr.name, app->key.pid);
514
515error:
516 return ret;
517}
518
099e26bd 519/*
5b4a0ec0 520 * Open metadata onto the UST tracer for a UST session.
0177d773 521 */
5b4a0ec0
DG
522static int open_ust_metadata(struct ust_app *app,
523 struct ust_app_session *ua_sess)
0177d773 524{
5b4a0ec0
DG
525 int ret;
526 struct lttng_ust_channel_attr uattr;
0177d773 527
5b4a0ec0
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528 uattr.overwrite = ua_sess->metadata->attr.overwrite;
529 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
530 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
531 uattr.switch_timer_interval =
532 ua_sess->metadata->attr.switch_timer_interval;
533 uattr.read_timer_interval =
534 ua_sess->metadata->attr.read_timer_interval;
535 uattr.output = ua_sess->metadata->attr.output;
536
537 /* UST tracer metadata creation */
538 ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr,
539 &ua_sess->metadata->obj);
540 if (ret < 0) {
fc34caaa
DG
541 ERR("UST app open metadata failed for app pid:%d with ret %d",
542 app->key.pid, ret);
f6a9efaa 543 goto error;
0177d773 544 }
f6a9efaa 545
6d3686da
DG
546 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
547
f6a9efaa 548error:
5b4a0ec0 549 return ret;
91d76f53
DG
550}
551
552/*
5b4a0ec0 553 * Create stream onto the UST tracer for a UST session.
91d76f53 554 */
5b4a0ec0
DG
555static int create_ust_stream(struct ust_app *app,
556 struct ust_app_session *ua_sess)
91d76f53 557{
5b4a0ec0 558 int ret;
421cb601 559
5b4a0ec0
DG
560 ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj,
561 &ua_sess->metadata->stream_obj);
562 if (ret < 0) {
563 ERR("UST create metadata stream failed");
421cb601 564 goto error;
91d76f53 565 }
421cb601 566
421cb601 567error:
5b4a0ec0 568 return ret;
91d76f53
DG
569}
570
b551a063 571/*
5b4a0ec0 572 * Create the specified channel onto the UST tracer for a UST session.
b551a063 573 */
5b4a0ec0
DG
574static int create_ust_channel(struct ust_app *app,
575 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
b551a063 576{
5b4a0ec0 577 int ret;
b551a063 578
5b4a0ec0
DG
579 /* TODO: remove cast and use lttng-ust-abi.h */
580 ret = ustctl_create_channel(app->key.sock, ua_sess->handle,
581 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
582 if (ret < 0) {
58f3ca76 583 ERR("Creating channel %s for app (pid: %d, sock: %d) "
5b4a0ec0
DG
584 "and session handle %d with ret %d",
585 ua_chan->name, app->key.pid, app->key.sock,
586 ua_sess->handle, ret);
b551a063
DG
587 goto error;
588 }
589
5b4a0ec0 590 ua_chan->handle = ua_chan->obj->handle;
b551a063 591
5b4a0ec0
DG
592 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
593 ua_chan->name, app->key.pid, app->key.sock);
b551a063 594
8535a6d9
DG
595 /* If channel is not enabled, disable it on the tracer */
596 if (!ua_chan->enabled) {
597 ret = disable_ust_channel(app, ua_sess, ua_chan);
598 if (ret < 0) {
599 goto error;
600 }
601 }
602
b551a063
DG
603error:
604 return ret;
605}
606
91d76f53 607/*
5b4a0ec0 608 * Create the specified event onto the UST tracer for a UST session.
91d76f53 609 */
edb67388
DG
610static
611int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
612 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 613{
5b4a0ec0 614 int ret = 0;
284d8f55 615
5b4a0ec0
DG
616 /* Create UST event on tracer */
617 ret = ustctl_create_event(app->key.sock, &ua_event->attr, ua_chan->obj,
618 &ua_event->obj);
619 if (ret < 0) {
fc34caaa
DG
620 if (ret == -EEXIST) {
621 ret = 0;
622 goto error;
623 }
5b4a0ec0
DG
624 ERR("Error ustctl create event %s for app pid: %d with ret %d",
625 ua_event->attr.name, app->key.pid, ret);
626 goto error;
91d76f53 627 }
f6a9efaa 628
5b4a0ec0 629 ua_event->handle = ua_event->obj->handle;
284d8f55 630
5b4a0ec0
DG
631 DBG2("UST app event %s created successfully for pid:%d",
632 ua_event->attr.name, app->key.pid);
f6a9efaa 633
8535a6d9 634 /* If event not enabled, disable it on the tracer */
fc34caaa 635 if (ua_event->enabled == 0) {
8535a6d9
DG
636 ret = disable_ust_event(app, ua_sess, ua_event);
637 if (ret < 0) {
fc34caaa
DG
638 /*
639 * If we hit an EPERM, something is wrong with our disable call. If
640 * we get an EEXIST, there is a problem on the tracer side since we
641 * just created it.
642 */
643 switch (ret) {
644 case -EPERM:
645 /* Code flow problem */
646 assert(0);
647 case -EEXIST:
648 /* It's OK for our use case. */
649 ret = 0;
650 break;
651 default:
652 break;
653 }
8535a6d9
DG
654 goto error;
655 }
656 }
657
5b4a0ec0
DG
658error:
659 return ret;
91d76f53 660}
48842b30 661
5b4a0ec0
DG
662/*
663 * Copy data between an UST app event and a LTT event.
664 */
421cb601 665static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
666 struct ltt_ust_event *uevent)
667{
bec39940 668 struct lttng_ht_iter iter;
55cc08a6
DG
669 struct ltt_ust_context *uctx;
670 struct ust_app_ctx *ua_ctx;
671
48842b30
DG
672 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
673 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
674
fc34caaa
DG
675 ua_event->enabled = uevent->enabled;
676
5b4a0ec0
DG
677 /* Copy event attributes */
678 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
679
bec39940 680 cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
681 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
682 if (ua_ctx == NULL) {
fc34caaa
DG
683 /* malloc() failed. We should simply stop */
684 return;
55cc08a6 685 }
fc34caaa 686
bec39940
DG
687 lttng_ht_node_init_ulong(&ua_ctx->node,
688 (unsigned long) ua_ctx->ctx.ctx);
689 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6 690 }
48842b30
DG
691}
692
5b4a0ec0
DG
693/*
694 * Copy data between an UST app channel and a LTT channel.
695 */
421cb601 696static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
697 struct ltt_ust_channel *uchan)
698{
bec39940
DG
699 struct lttng_ht_iter iter;
700 struct lttng_ht_node_str *ua_event_node;
48842b30 701 struct ltt_ust_event *uevent;
55cc08a6 702 struct ltt_ust_context *uctx;
48842b30 703 struct ust_app_event *ua_event;
55cc08a6 704 struct ust_app_ctx *ua_ctx;
48842b30 705
fc34caaa 706 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
707
708 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
709 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
5b4a0ec0
DG
710 /* Copy event attributes */
711 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
48842b30 712
fc34caaa
DG
713 ua_chan->enabled = uchan->enabled;
714
bec39940 715 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
716 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
717 if (ua_ctx == NULL) {
718 continue;
719 }
bec39940
DG
720 lttng_ht_node_init_ulong(&ua_ctx->node,
721 (unsigned long) ua_ctx->ctx.ctx);
722 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6 723 }
48842b30 724
421cb601 725 /* Copy all events from ltt ust channel to ust app channel */
bec39940
DG
726 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
727 struct lttng_ht_iter uiter;
ba767faf 728
bec39940
DG
729 lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter);
730 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
48842b30 731 if (ua_event_node == NULL) {
421cb601 732 DBG2("UST event %s not found on shadow copy channel",
48842b30 733 uevent->attr.name);
284d8f55 734 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 735 if (ua_event == NULL) {
5b4a0ec0 736 continue;
48842b30 737 }
421cb601 738 shadow_copy_event(ua_event, uevent);
bec39940 739 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
48842b30 740 }
48842b30
DG
741 }
742
fc34caaa 743 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
744}
745
5b4a0ec0
DG
746/*
747 * Copy data between a UST app session and a regular LTT session.
748 */
421cb601 749static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 750 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 751{
bec39940
DG
752 struct lttng_ht_node_str *ua_chan_node;
753 struct lttng_ht_iter iter;
48842b30
DG
754 struct ltt_ust_channel *uchan;
755 struct ust_app_channel *ua_chan;
477d7741
MD
756 time_t rawtime;
757 struct tm *timeinfo;
758 char datetime[16];
759 int ret;
760
761 /* Get date and time for unique app path */
762 time(&rawtime);
763 timeinfo = localtime(&rawtime);
764 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 765
421cb601 766 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 767
a991f516 768 ua_sess->id = usess->id;
6df2e2c9
MD
769 ua_sess->uid = usess->uid;
770 ua_sess->gid = usess->gid;
48842b30 771
fc34caaa
DG
772 ret = snprintf(ua_sess->path, PATH_MAX, "%s/%s-%d-%s", usess->pathname,
773 app->name, app->key.pid, datetime);
477d7741
MD
774 if (ret < 0) {
775 PERROR("asprintf UST shadow copy session");
776 /* TODO: We cannot return an error from here.. */
777 assert(0);
778 }
779
48842b30
DG
780 /* TODO: support all UST domain */
781
782 /* Iterate over all channels in global domain. */
bec39940
DG
783 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
784 uchan, node.node) {
785 struct lttng_ht_iter uiter;
ba767faf 786
bec39940
DG
787 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
788 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
5b4a0ec0 789 if (ua_chan_node != NULL) {
fc34caaa 790 /* Session exist. Contiuing. */
5b4a0ec0
DG
791 continue;
792 }
421cb601 793
5b4a0ec0
DG
794 DBG2("Channel %s not found on shadow session copy, creating it",
795 uchan->name);
796 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
797 if (ua_chan == NULL) {
fc34caaa 798 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
5b4a0ec0 799 continue;
48842b30
DG
800 }
801
5b4a0ec0 802 shadow_copy_channel(ua_chan, uchan);
bec39940 803 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
48842b30
DG
804 }
805}
806
78f0bacd
DG
807/*
808 * Lookup sesison wrapper.
809 */
84cd17c6
MD
810static
811void __lookup_session_by_app(struct ltt_ust_session *usess,
bec39940 812 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
813{
814 /* Get right UST app session from app */
2c348c10 815 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
84cd17c6
MD
816}
817
421cb601
DG
818/*
819 * Return ust app session from the app session hashtable using the UST session
a991f516 820 * id.
421cb601 821 */
48842b30
DG
822static struct ust_app_session *lookup_session_by_app(
823 struct ltt_ust_session *usess, struct ust_app *app)
824{
bec39940
DG
825 struct lttng_ht_iter iter;
826 struct lttng_ht_node_ulong *node;
48842b30 827
84cd17c6 828 __lookup_session_by_app(usess, app, &iter);
bec39940 829 node = lttng_ht_iter_get_node_ulong(&iter);
48842b30
DG
830 if (node == NULL) {
831 goto error;
832 }
833
834 return caa_container_of(node, struct ust_app_session, node);
835
836error:
837 return NULL;
838}
839
421cb601
DG
840/*
841 * Create a UST session onto the tracer of app and add it the session
842 * hashtable.
843 *
844 * Return ust app session or NULL on error.
845 */
846static struct ust_app_session *create_ust_app_session(
847 struct ltt_ust_session *usess, struct ust_app *app)
848{
849 int ret;
850 struct ust_app_session *ua_sess;
851
852 ua_sess = lookup_session_by_app(usess, app);
853 if (ua_sess == NULL) {
a991f516
MD
854 DBG2("UST app pid: %d session id %d not found, creating it",
855 app->key.pid, usess->id);
421cb601
DG
856 ua_sess = alloc_ust_app_session();
857 if (ua_sess == NULL) {
858 /* Only malloc can failed so something is really wrong */
fc34caaa 859 goto end;
421cb601 860 }
477d7741 861 shadow_copy_session(ua_sess, usess, app);
421cb601
DG
862 }
863
864 if (ua_sess->handle == -1) {
865 ret = ustctl_create_session(app->key.sock);
866 if (ret < 0) {
fc34caaa 867 ERR("Creating session for app pid %d", app->key.pid);
421cb601
DG
868 goto error;
869 }
870
421cb601
DG
871 ua_sess->handle = ret;
872
873 /* Add ust app session to app's HT */
2c348c10 874 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
bec39940 875 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
421cb601
DG
876
877 DBG2("UST app session created successfully with handle %d", ret);
878 }
879
fc34caaa 880end:
421cb601
DG
881 return ua_sess;
882
883error:
fc34caaa 884 delete_ust_app_session(-1, ua_sess);
421cb601
DG
885 return NULL;
886}
887
55cc08a6
DG
888/*
889 * Create a context for the channel on the tracer.
890 */
891static
892int create_ust_app_channel_context(struct ust_app_session *ua_sess,
893 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
894 struct ust_app *app)
895{
896 int ret = 0;
bec39940
DG
897 struct lttng_ht_iter iter;
898 struct lttng_ht_node_ulong *node;
55cc08a6
DG
899 struct ust_app_ctx *ua_ctx;
900
901 DBG2("UST app adding context to channel %s", ua_chan->name);
902
bec39940
DG
903 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
904 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
905 if (node != NULL) {
906 ret = -EEXIST;
907 goto error;
908 }
909
910 ua_ctx = alloc_ust_app_ctx(uctx);
911 if (ua_ctx == NULL) {
912 /* malloc failed */
913 ret = -1;
914 goto error;
915 }
916
bec39940
DG
917 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
918 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6
DG
919
920 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
921 if (ret < 0) {
922 goto error;
923 }
924
925error:
926 return ret;
927}
928
929/*
930 * Create an UST context and enable it for the event on the tracer.
931 */
932static
933int create_ust_app_event_context(struct ust_app_session *ua_sess,
934 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
935 struct ust_app *app)
936{
937 int ret = 0;
bec39940
DG
938 struct lttng_ht_iter iter;
939 struct lttng_ht_node_ulong *node;
55cc08a6
DG
940 struct ust_app_ctx *ua_ctx;
941
942 DBG2("UST app adding context to event %s", ua_event->name);
943
bec39940
DG
944 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
945 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
946 if (node != NULL) {
947 ret = -EEXIST;
948 goto error;
949 }
950
951 ua_ctx = alloc_ust_app_ctx(uctx);
952 if (ua_ctx == NULL) {
953 /* malloc failed */
954 ret = -1;
955 goto error;
956 }
957
bec39940
DG
958 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
959 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6
DG
960
961 ret = create_ust_event_context(ua_event, ua_ctx, app);
962 if (ret < 0) {
963 goto error;
964 }
965
966error:
967 return ret;
968}
969
edb67388
DG
970/*
971 * Enable on the tracer side a ust app event for the session and channel.
972 */
973static
974int enable_ust_app_event(struct ust_app_session *ua_sess,
35a9059d 975 struct ust_app_event *ua_event, struct ust_app *app)
edb67388
DG
976{
977 int ret;
978
979 ret = enable_ust_event(app, ua_sess, ua_event);
980 if (ret < 0) {
981 goto error;
982 }
983
984 ua_event->enabled = 1;
985
986error:
987 return ret;
988}
989
9730260e
DG
990/*
991 * Disable on the tracer side a ust app event for the session and channel.
992 */
993static int disable_ust_app_event(struct ust_app_session *ua_sess,
7f79d3a1 994 struct ust_app_event *ua_event, struct ust_app *app)
9730260e
DG
995{
996 int ret;
997
998 ret = disable_ust_event(app, ua_sess, ua_event);
999 if (ret < 0) {
1000 goto error;
1001 }
1002
1003 ua_event->enabled = 0;
1004
1005error:
1006 return ret;
1007}
1008
78f0bacd
DG
1009/*
1010 * Lookup ust app channel for session and disable it on the tracer side.
1011 */
8535a6d9
DG
1012static
1013int disable_ust_app_channel(struct ust_app_session *ua_sess,
1014 struct ust_app_channel *ua_chan, struct ust_app *app)
78f0bacd 1015{
8535a6d9 1016 int ret;
78f0bacd
DG
1017
1018 ret = disable_ust_channel(app, ua_sess, ua_chan);
1019 if (ret < 0) {
1020 goto error;
1021 }
1022
8535a6d9
DG
1023 ua_chan->enabled = 0;
1024
78f0bacd
DG
1025error:
1026 return ret;
1027}
1028
1029/*
1030 * Lookup ust app channel for session and enable it on the tracer side.
1031 */
1032static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1033 struct ltt_ust_channel *uchan, struct ust_app *app)
1034{
1035 int ret = 0;
bec39940
DG
1036 struct lttng_ht_iter iter;
1037 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1038 struct ust_app_channel *ua_chan;
1039
bec39940
DG
1040 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1041 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
78f0bacd 1042 if (ua_chan_node == NULL) {
a991f516
MD
1043 DBG2("Unable to find channel %s in ust session id %u",
1044 uchan->name, ua_sess->id);
78f0bacd
DG
1045 goto error;
1046 }
1047
1048 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1049
1050 ret = enable_ust_channel(app, ua_sess, ua_chan);
1051 if (ret < 0) {
1052 goto error;
1053 }
1054
1055error:
1056 return ret;
1057}
1058
284d8f55 1059/*
5b4a0ec0 1060 * Create UST app channel and create it on the tracer.
284d8f55 1061 */
5b4a0ec0
DG
1062static struct ust_app_channel *create_ust_app_channel(
1063 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1064 struct ust_app *app)
1065{
1066 int ret = 0;
bec39940
DG
1067 struct lttng_ht_iter iter;
1068 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
1069 struct ust_app_channel *ua_chan;
1070
1071 /* Lookup channel in the ust app session */
bec39940
DG
1072 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1073 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 1074 if (ua_chan_node != NULL) {
5b4a0ec0 1075 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 1076 goto end;
5b4a0ec0
DG
1077 }
1078
fc34caaa
DG
1079 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1080 if (ua_chan == NULL) {
1081 /* Only malloc can fail here */
1082 goto error;
1083 }
1084 shadow_copy_channel(ua_chan, uchan);
1085
5b4a0ec0
DG
1086 ret = create_ust_channel(app, ua_sess, ua_chan);
1087 if (ret < 0) {
fc34caaa
DG
1088 /* Not found previously means that it does not exist on the tracer */
1089 assert(ret != -EEXIST);
5b4a0ec0
DG
1090 goto error;
1091 }
1092
58f3ca76
DG
1093 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1094
fc34caaa
DG
1095 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
1096 app->key.pid);
1097
1098end:
5b4a0ec0
DG
1099 return ua_chan;
1100
1101error:
fc34caaa 1102 delete_ust_app_channel(-1, ua_chan);
5b4a0ec0
DG
1103 return NULL;
1104}
1105
1106/*
1107 * Create UST app event and create it on the tracer side.
1108 */
edb67388
DG
1109static
1110int create_ust_app_event(struct ust_app_session *ua_sess,
1111 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1112 struct ust_app *app)
284d8f55 1113{
edb67388 1114 int ret = 0;
bec39940
DG
1115 struct lttng_ht_iter iter;
1116 struct lttng_ht_node_str *ua_event_node;
5b4a0ec0 1117 struct ust_app_event *ua_event;
284d8f55 1118
5b4a0ec0 1119 /* Get event node */
bec39940
DG
1120 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1121 ua_event_node = lttng_ht_iter_get_node_str(&iter);
edb67388 1122 if (ua_event_node != NULL) {
fc34caaa 1123 ret = -EEXIST;
edb67388
DG
1124 goto end;
1125 }
5b4a0ec0 1126
edb67388
DG
1127 /* Does not exist so create one */
1128 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1129 if (ua_event == NULL) {
1130 /* Only malloc can failed so something is really wrong */
1131 ret = -ENOMEM;
fc34caaa 1132 goto end;
5b4a0ec0 1133 }
edb67388 1134 shadow_copy_event(ua_event, uevent);
5b4a0ec0 1135
edb67388 1136 /* Create it on the tracer side */
5b4a0ec0 1137 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 1138 if (ret < 0) {
fc34caaa
DG
1139 /* Not found previously means that it does not exist on the tracer */
1140 assert(ret != -EEXIST);
284d8f55
DG
1141 goto error;
1142 }
1143
bec39940 1144 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
284d8f55 1145
fc34caaa
DG
1146 DBG2("UST app create event %s for PID %d completed", ua_event->name,
1147 app->key.pid);
7f79d3a1 1148
edb67388 1149end:
fc34caaa
DG
1150 return ret;
1151
5b4a0ec0 1152error:
fc34caaa
DG
1153 /* Valid. Calling here is already in a read side lock */
1154 delete_ust_app_event(-1, ua_event);
edb67388 1155 return ret;
5b4a0ec0
DG
1156}
1157
1158/*
1159 * Create UST metadata and open it on the tracer side.
1160 */
1161static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1162 char *pathname, struct ust_app *app)
1163{
1164 int ret = 0;
1165
1166 if (ua_sess->metadata == NULL) {
1167 /* Allocate UST metadata */
1168 ua_sess->metadata = trace_ust_create_metadata(pathname);
1169 if (ua_sess->metadata == NULL) {
fc34caaa 1170 /* malloc() failed */
5b4a0ec0
DG
1171 goto error;
1172 }
1173
1174 ret = open_ust_metadata(app, ua_sess);
1175 if (ret < 0) {
7db205b5
DG
1176 DBG3("Opening metadata failed. Cleaning up memory");
1177
fc34caaa
DG
1178 /* Cleanup failed metadata struct */
1179 free(ua_sess->metadata);
7db205b5
DG
1180 /*
1181 * This is very important because delete_ust_app_session check if
1182 * the pointer is null or not in order to delete the metadata.
1183 */
1184 ua_sess->metadata = NULL;
5b4a0ec0
DG
1185 goto error;
1186 }
1187
1188 DBG2("UST metadata opened for app pid %d", app->key.pid);
1189 }
1190
1191 /* Open UST metadata stream */
1192 if (ua_sess->metadata->stream_obj == NULL) {
1193 ret = create_ust_stream(app, ua_sess);
1194 if (ret < 0) {
1195 goto error;
1196 }
1197
e11d277b 1198 ret = run_as_mkdir(ua_sess->path, S_IRWXU | S_IRWXG,
67f747d8 1199 ua_sess->uid, ua_sess->gid);
5b4a0ec0
DG
1200 if (ret < 0) {
1201 PERROR("mkdir UST metadata");
1202 goto error;
1203 }
1204
477d7741
MD
1205 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1206 "%s/metadata", ua_sess->path);
5b4a0ec0
DG
1207 if (ret < 0) {
1208 PERROR("asprintf UST create stream");
1209 goto error;
1210 }
1211
1212 DBG2("UST metadata stream object created for app pid %d",
1213 app->key.pid);
1214 } else {
1215 ERR("Attempting to create stream without metadata opened");
1216 goto error;
1217 }
1218
1219 return 0;
1220
1221error:
1222 return -1;
1223}
1224
1225/*
1226 * Return pointer to traceable apps list.
1227 */
bec39940 1228struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
1229{
1230 return ust_app_ht;
1231}
1232
1233/*
1234 * Return ust app pointer or NULL if not found.
1235 */
1236struct ust_app *ust_app_find_by_pid(pid_t pid)
1237{
bec39940
DG
1238 struct lttng_ht_node_ulong *node;
1239 struct lttng_ht_iter iter;
5b4a0ec0
DG
1240
1241 rcu_read_lock();
bec39940
DG
1242 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1243 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
1244 if (node == NULL) {
1245 DBG2("UST app no found with pid %d", pid);
1246 goto error;
1247 }
1248 rcu_read_unlock();
1249
1250 DBG2("Found UST app by pid %d", pid);
1251
1252 return caa_container_of(node, struct ust_app, node);
1253
1254error:
1255 rcu_read_unlock();
1256 return NULL;
1257}
1258
1259/*
1260 * Using pid and uid (of the app), allocate a new ust_app struct and
1261 * add it to the global traceable app list.
1262 *
0df502fd
MD
1263 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1264 * bitness is not supported.
5b4a0ec0
DG
1265 */
1266int ust_app_register(struct ust_register_msg *msg, int sock)
1267{
1268 struct ust_app *lta;
1269
7753dea8
MD
1270 if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
1271 || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
f943b0fb 1272 ERR("Registration failed: application \"%s\" (pid: %d) has "
7753dea8
MD
1273 "%d-bit long, but no consumerd for this long size is available.\n",
1274 msg->name, msg->pid, msg->bits_per_long);
88ff5b7f 1275 close(sock);
0df502fd
MD
1276 return -EINVAL;
1277 }
5b4a0ec0
DG
1278 lta = zmalloc(sizeof(struct ust_app));
1279 if (lta == NULL) {
1280 PERROR("malloc");
1281 return -ENOMEM;
1282 }
1283
1284 lta->ppid = msg->ppid;
1285 lta->uid = msg->uid;
1286 lta->gid = msg->gid;
e0c7ec2b 1287 lta->compatible = 0; /* Not compatible until proven */
7753dea8 1288 lta->bits_per_long = msg->bits_per_long;
5b4a0ec0
DG
1289 lta->v_major = msg->major;
1290 lta->v_minor = msg->minor;
1291 strncpy(lta->name, msg->name, sizeof(lta->name));
1292 lta->name[16] = '\0';
bec39940 1293 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
5b4a0ec0
DG
1294
1295 /* Set key map */
1296 lta->key.pid = msg->pid;
bec39940 1297 lttng_ht_node_init_ulong(&lta->node, (unsigned long)lta->key.pid);
5b4a0ec0 1298 lta->key.sock = sock;
bec39940 1299 lttng_ht_node_init_ulong(&lta->key.node, (unsigned long)lta->key.sock);
5b4a0ec0
DG
1300
1301 rcu_read_lock();
bec39940
DG
1302 lttng_ht_add_unique_ulong(ust_app_sock_key_map, &lta->key.node);
1303 lttng_ht_add_unique_ulong(ust_app_ht, &lta->node);
5b4a0ec0
DG
1304 rcu_read_unlock();
1305
1306 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1307 " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid,
1308 lta->key.sock, lta->name, lta->v_major, lta->v_minor);
1309
1310 return 0;
1311}
1312
1313/*
1314 * Unregister app by removing it from the global traceable app list and freeing
1315 * the data struct.
1316 *
1317 * The socket is already closed at this point so no close to sock.
1318 */
1319void ust_app_unregister(int sock)
1320{
1321 struct ust_app *lta;
bec39940
DG
1322 struct lttng_ht_node_ulong *node;
1323 struct lttng_ht_iter iter;
525b0740 1324 int ret;
5b4a0ec0
DG
1325
1326 rcu_read_lock();
1327 lta = find_app_by_sock(sock);
1328 if (lta == NULL) {
1329 ERR("Unregister app sock %d not found!", sock);
1330 goto error;
1331 }
1332
1333 DBG("PID %d unregistering with sock %d", lta->key.pid, sock);
1334
886459c6
MD
1335 /* Remove application from socket hash table */
1336 lttng_ht_lookup(ust_app_sock_key_map, (void *)((unsigned long) sock), &iter);
1337 ret = lttng_ht_del(ust_app_sock_key_map, &iter);
1338 assert(!ret);
1339
5b4a0ec0 1340 /* Get the node reference for a call_rcu */
bec39940
DG
1341 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) lta->key.pid), &iter);
1342 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
1343 if (node == NULL) {
1344 ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid);
1345 goto error;
1346 }
284d8f55 1347
886459c6 1348 /* Remove application from PID hash table */
bec39940 1349 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1350 assert(!ret);
5b4a0ec0 1351 call_rcu(&node->head, delete_ust_app_rcu);
284d8f55 1352error:
5b4a0ec0
DG
1353 rcu_read_unlock();
1354 return;
284d8f55
DG
1355}
1356
1357/*
5b4a0ec0 1358 * Return traceable_app_count
284d8f55 1359 */
5b4a0ec0 1360unsigned long ust_app_list_count(void)
284d8f55 1361{
5b4a0ec0 1362 unsigned long count;
284d8f55 1363
5b4a0ec0 1364 rcu_read_lock();
bec39940 1365 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 1366 rcu_read_unlock();
284d8f55 1367
5b4a0ec0 1368 return count;
284d8f55
DG
1369}
1370
5b4a0ec0
DG
1371/*
1372 * Fill events array with all events name of all registered apps.
1373 */
1374int ust_app_list_events(struct lttng_event **events)
421cb601 1375{
5b4a0ec0
DG
1376 int ret, handle;
1377 size_t nbmem, count = 0;
bec39940 1378 struct lttng_ht_iter iter;
5b4a0ec0
DG
1379 struct ust_app *app;
1380 struct lttng_event *tmp;
421cb601 1381
5b4a0ec0
DG
1382 nbmem = UST_APP_EVENT_LIST_SIZE;
1383 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1384 if (tmp == NULL) {
1385 PERROR("zmalloc ust app events");
1386 ret = -ENOMEM;
421cb601
DG
1387 goto error;
1388 }
1389
5b4a0ec0 1390 rcu_read_lock();
421cb601 1391
bec39940 1392 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
90eaa0d2 1393 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 1394
e0c7ec2b
DG
1395 if (!app->compatible) {
1396 /*
1397 * TODO: In time, we should notice the caller of this error by
1398 * telling him that this is a version error.
1399 */
1400 continue;
1401 }
5b4a0ec0
DG
1402 handle = ustctl_tracepoint_list(app->key.sock);
1403 if (handle < 0) {
1404 ERR("UST app list events getting handle failed for app pid %d",
1405 app->key.pid);
1406 continue;
1407 }
421cb601 1408
5b4a0ec0 1409 while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle,
90eaa0d2 1410 &uiter)) != -ENOENT) {
815564d8
MD
1411 if (count >= nbmem) {
1412 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1413 2 * nbmem);
1414 nbmem *= 2;
2f221590 1415 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
5b4a0ec0
DG
1416 if (tmp == NULL) {
1417 PERROR("realloc ust app events");
1418 ret = -ENOMEM;
1419 goto rcu_error;
1420 }
1421 }
90eaa0d2
DG
1422 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1423 memcpy(tmp[count].loglevel, uiter.loglevel, LTTNG_UST_SYM_NAME_LEN);
1424 tmp[count].loglevel_value = uiter.loglevel_value;
5b4a0ec0
DG
1425 tmp[count].type = LTTNG_UST_TRACEPOINT;
1426 tmp[count].pid = app->key.pid;
1427 tmp[count].enabled = -1;
1428 count++;
421cb601 1429 }
421cb601
DG
1430 }
1431
5b4a0ec0
DG
1432 ret = count;
1433 *events = tmp;
421cb601 1434
5b4a0ec0 1435 DBG2("UST app list events done (%zu events)", count);
421cb601 1436
5b4a0ec0
DG
1437rcu_error:
1438 rcu_read_unlock();
421cb601 1439error:
5b4a0ec0 1440 return ret;
421cb601
DG
1441}
1442
5b4a0ec0
DG
1443/*
1444 * Free and clean all traceable apps of the global list.
1445 */
1446void ust_app_clean_list(void)
421cb601 1447{
5b4a0ec0 1448 int ret;
bec39940
DG
1449 struct lttng_ht_iter iter;
1450 struct lttng_ht_node_ulong *node;
421cb601 1451
5b4a0ec0 1452 DBG2("UST app cleaning registered apps hash table");
421cb601 1453
5b4a0ec0 1454 rcu_read_lock();
421cb601 1455
bec39940
DG
1456 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
1457 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1458 assert(!ret);
bec39940 1459 call_rcu(&node->head, delete_ust_app_rcu);
421cb601 1460 }
bec39940
DG
1461 /* Destroy is done only when the ht is empty */
1462 lttng_ht_destroy(ust_app_ht);
421cb601 1463
bec39940
DG
1464 cds_lfht_for_each_entry(ust_app_sock_key_map->ht, &iter.iter, node, node) {
1465 ret = lttng_ht_del(ust_app_sock_key_map, &iter);
1466 assert(!ret);
1467 }
1468 /* Destroy is done only when the ht is empty */
1469 lttng_ht_destroy(ust_app_sock_key_map);
421cb601 1470
5b4a0ec0
DG
1471 rcu_read_unlock();
1472}
1473
1474/*
1475 * Init UST app hash table.
1476 */
1477void ust_app_ht_alloc(void)
1478{
bec39940
DG
1479 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1480 ust_app_sock_key_map = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
1481}
1482
78f0bacd
DG
1483/*
1484 * For a specific UST session, disable the channel for all registered apps.
1485 */
35a9059d 1486int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1487 struct ltt_ust_channel *uchan)
1488{
1489 int ret = 0;
bec39940
DG
1490 struct lttng_ht_iter iter;
1491 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1492 struct ust_app *app;
1493 struct ust_app_session *ua_sess;
8535a6d9 1494 struct ust_app_channel *ua_chan;
78f0bacd
DG
1495
1496 if (usess == NULL || uchan == NULL) {
1497 ERR("Disabling UST global channel with NULL values");
1498 ret = -1;
1499 goto error;
1500 }
1501
a991f516
MD
1502 DBG2("UST app disabling channel %s from global domain for session id %d",
1503 uchan->name, usess->id);
78f0bacd
DG
1504
1505 rcu_read_lock();
1506
1507 /* For every registered applications */
bec39940
DG
1508 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1509 struct lttng_ht_iter uiter;
e0c7ec2b
DG
1510 if (!app->compatible) {
1511 /*
1512 * TODO: In time, we should notice the caller of this error by
1513 * telling him that this is a version error.
1514 */
1515 continue;
1516 }
78f0bacd
DG
1517 ua_sess = lookup_session_by_app(usess, app);
1518 if (ua_sess == NULL) {
1519 continue;
1520 }
1521
8535a6d9 1522 /* Get channel */
bec39940
DG
1523 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1524 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
1525 /* If the session if found for the app, the channel must be there */
1526 assert(ua_chan_node);
1527
1528 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1529 /* The channel must not be already disabled */
1530 assert(ua_chan->enabled == 1);
1531
1532 /* Disable channel onto application */
1533 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
1534 if (ret < 0) {
1535 /* XXX: We might want to report this error at some point... */
1536 continue;
1537 }
1538 }
1539
1540 rcu_read_unlock();
1541
1542error:
1543 return ret;
1544}
1545
1546/*
1547 * For a specific UST session, enable the channel for all registered apps.
1548 */
35a9059d 1549int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1550 struct ltt_ust_channel *uchan)
1551{
1552 int ret = 0;
bec39940 1553 struct lttng_ht_iter iter;
78f0bacd
DG
1554 struct ust_app *app;
1555 struct ust_app_session *ua_sess;
1556
1557 if (usess == NULL || uchan == NULL) {
1558 ERR("Adding UST global channel to NULL values");
1559 ret = -1;
1560 goto error;
1561 }
1562
a991f516
MD
1563 DBG2("UST app enabling channel %s to global domain for session id %d",
1564 uchan->name, usess->id);
78f0bacd
DG
1565
1566 rcu_read_lock();
1567
1568 /* For every registered applications */
bec39940 1569 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
e0c7ec2b
DG
1570 if (!app->compatible) {
1571 /*
1572 * TODO: In time, we should notice the caller of this error by
1573 * telling him that this is a version error.
1574 */
1575 continue;
1576 }
78f0bacd
DG
1577 ua_sess = lookup_session_by_app(usess, app);
1578 if (ua_sess == NULL) {
1579 continue;
1580 }
1581
1582 /* Enable channel onto application */
1583 ret = enable_ust_app_channel(ua_sess, uchan, app);
1584 if (ret < 0) {
1585 /* XXX: We might want to report this error at some point... */
1586 continue;
1587 }
1588 }
1589
1590 rcu_read_unlock();
1591
1592error:
1593 return ret;
1594}
1595
b0a40d28
DG
1596/*
1597 * Disable an event in a channel and for a specific session.
1598 */
35a9059d
DG
1599int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1600 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
1601{
1602 int ret = 0;
bec39940
DG
1603 struct lttng_ht_iter iter, uiter;
1604 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
b0a40d28
DG
1605 struct ust_app *app;
1606 struct ust_app_session *ua_sess;
1607 struct ust_app_channel *ua_chan;
1608 struct ust_app_event *ua_event;
1609
1610 DBG("UST app disabling event %s for all apps in channel "
a991f516 1611 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
1612
1613 rcu_read_lock();
1614
1615 /* For all registered applications */
bec39940 1616 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
e0c7ec2b
DG
1617 if (!app->compatible) {
1618 /*
1619 * TODO: In time, we should notice the caller of this error by
1620 * telling him that this is a version error.
1621 */
1622 continue;
1623 }
b0a40d28
DG
1624 ua_sess = lookup_session_by_app(usess, app);
1625 if (ua_sess == NULL) {
1626 /* Next app */
1627 continue;
1628 }
1629
1630 /* Lookup channel in the ust app session */
bec39940
DG
1631 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1632 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 1633 if (ua_chan_node == NULL) {
a991f516
MD
1634 DBG2("Channel %s not found in session id %d for app pid %d."
1635 "Skipping", uchan->name, usess->id, app->key.pid);
b0a40d28
DG
1636 continue;
1637 }
1638 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1639
bec39940
DG
1640 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1641 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28
DG
1642 if (ua_event_node == NULL) {
1643 DBG2("Event %s not found in channel %s for app pid %d."
35a9059d 1644 "Skipping", uevent->attr.name, uchan->name, app->key.pid);
b0a40d28
DG
1645 continue;
1646 }
1647 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1648
7f79d3a1 1649 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
1650 if (ret < 0) {
1651 /* XXX: Report error someday... */
1652 continue;
1653 }
1654 }
1655
1656 rcu_read_unlock();
1657
1658 return ret;
1659}
1660
9730260e 1661/*
edb67388 1662 * For a specific UST session and UST channel, the event for all
9730260e
DG
1663 * registered apps.
1664 */
35a9059d 1665int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
9730260e
DG
1666 struct ltt_ust_channel *uchan)
1667{
1668 int ret = 0;
bec39940
DG
1669 struct lttng_ht_iter iter, uiter;
1670 struct lttng_ht_node_str *ua_chan_node;
9730260e
DG
1671 struct ust_app *app;
1672 struct ust_app_session *ua_sess;
1673 struct ust_app_channel *ua_chan;
1674 struct ust_app_event *ua_event;
1675
1676 DBG("UST app disabling all event for all apps in channel "
a991f516 1677 "%s for session id %d", uchan->name, usess->id);
9730260e
DG
1678
1679 rcu_read_lock();
1680
1681 /* For all registered applications */
bec39940 1682 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
e0c7ec2b
DG
1683 if (!app->compatible) {
1684 /*
1685 * TODO: In time, we should notice the caller of this error by
1686 * telling him that this is a version error.
1687 */
1688 continue;
1689 }
9730260e 1690 ua_sess = lookup_session_by_app(usess, app);
edb67388
DG
1691 /* If ua_sess is NULL, there is a code flow error */
1692 assert(ua_sess);
9730260e
DG
1693
1694 /* Lookup channel in the ust app session */
bec39940
DG
1695 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1696 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1697 /* If the channel is not found, there is a code flow error */
1698 assert(ua_chan_node);
1699
9730260e
DG
1700 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1701
1702 /* Disable each events of channel */
bec39940
DG
1703 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1704 node.node) {
7f79d3a1 1705 ret = disable_ust_app_event(ua_sess, ua_event, app);
9730260e
DG
1706 if (ret < 0) {
1707 /* XXX: Report error someday... */
1708 continue;
1709 }
1710 }
1711 }
1712
1713 rcu_read_unlock();
1714
1715 return ret;
1716}
1717
421cb601 1718/*
5b4a0ec0 1719 * For a specific UST session, create the channel for all registered apps.
421cb601 1720 */
35a9059d 1721int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
1722 struct ltt_ust_channel *uchan)
1723{
bec39940 1724 struct lttng_ht_iter iter;
48842b30
DG
1725 struct ust_app *app;
1726 struct ust_app_session *ua_sess;
1727 struct ust_app_channel *ua_chan;
1728
fc34caaa
DG
1729 /* Very wrong code flow */
1730 assert(usess);
1731 assert(uchan);
421cb601 1732
a991f516
MD
1733 DBG2("UST app adding channel %s to global domain for session id %d",
1734 uchan->name, usess->id);
48842b30
DG
1735
1736 rcu_read_lock();
421cb601 1737
5b4a0ec0 1738 /* For every registered applications */
bec39940 1739 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
e0c7ec2b
DG
1740 if (!app->compatible) {
1741 /*
1742 * TODO: In time, we should notice the caller of this error by
1743 * telling him that this is a version error.
1744 */
1745 continue;
1746 }
edb67388
DG
1747 /*
1748 * Create session on the tracer side and add it to app session HT. Note
1749 * that if session exist, it will simply return a pointer to the ust
1750 * app session.
1751 */
421cb601 1752 ua_sess = create_ust_app_session(usess, app);
509cbaf8 1753 if (ua_sess == NULL) {
fc34caaa
DG
1754 /* Major problem here and it's maybe the tracer or malloc() */
1755 goto error;
48842b30
DG
1756 }
1757
421cb601
DG
1758 /* Create channel onto application */
1759 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
1760 if (ua_chan == NULL) {
fc34caaa
DG
1761 /* Major problem here and it's maybe the tracer or malloc() */
1762 goto error;
48842b30 1763 }
48842b30 1764 }
5b4a0ec0 1765
48842b30
DG
1766 rcu_read_unlock();
1767
fc34caaa
DG
1768 return 0;
1769
421cb601 1770error:
fc34caaa 1771 return -1;
48842b30
DG
1772}
1773
5b4a0ec0 1774/*
edb67388 1775 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 1776 */
35a9059d 1777int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
1778 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1779{
1780 int ret = 0;
bec39940
DG
1781 struct lttng_ht_iter iter, uiter;
1782 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
48842b30
DG
1783 struct ust_app *app;
1784 struct ust_app_session *ua_sess;
1785 struct ust_app_channel *ua_chan;
1786 struct ust_app_event *ua_event;
48842b30 1787
a991f516
MD
1788 DBG("UST app enabling event %s for all apps for session id %d",
1789 uevent->attr.name, usess->id);
48842b30 1790
edb67388
DG
1791 /*
1792 * NOTE: At this point, this function is called only if the session and
1793 * channel passed are already created for all apps. and enabled on the
1794 * tracer also.
1795 */
1796
48842b30 1797 rcu_read_lock();
421cb601
DG
1798
1799 /* For all registered applications */
bec39940 1800 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
e0c7ec2b
DG
1801 if (!app->compatible) {
1802 /*
1803 * TODO: In time, we should notice the caller of this error by
1804 * telling him that this is a version error.
1805 */
1806 continue;
1807 }
edb67388
DG
1808 ua_sess = lookup_session_by_app(usess, app);
1809 /* If ua_sess is NULL, there is a code flow error */
1810 assert(ua_sess);
ba767faf 1811
edb67388 1812 /* Lookup channel in the ust app session */
bec39940
DG
1813 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1814 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1815 /* If the channel is not found, there is a code flow error */
1816 assert(ua_chan_node);
1817
1818 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1819
bec39940
DG
1820 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
1821 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
35a9059d 1822 if (ua_event_node == NULL) {
7f79d3a1
DG
1823 DBG3("UST app enable event %s not found for app PID %d."
1824 "Skipping app", uevent->attr.name, app->key.pid);
35a9059d
DG
1825 continue;
1826 }
1827 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1828
1829 ret = enable_ust_app_event(ua_sess, ua_event, app);
1830 if (ret < 0) {
7f79d3a1 1831 goto error;
48842b30 1832 }
edb67388
DG
1833 }
1834
7f79d3a1 1835error:
edb67388 1836 rcu_read_unlock();
edb67388
DG
1837 return ret;
1838}
1839
1840/*
1841 * For a specific existing UST session and UST channel, creates the event for
1842 * all registered apps.
1843 */
35a9059d 1844int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
1845 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1846{
1847 int ret = 0;
bec39940
DG
1848 struct lttng_ht_iter iter, uiter;
1849 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
1850 struct ust_app *app;
1851 struct ust_app_session *ua_sess;
1852 struct ust_app_channel *ua_chan;
1853
a991f516
MD
1854 DBG("UST app creating event %s for all apps for session id %d",
1855 uevent->attr.name, usess->id);
edb67388 1856
edb67388
DG
1857 rcu_read_lock();
1858
1859 /* For all registered applications */
bec39940 1860 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
e0c7ec2b
DG
1861 if (!app->compatible) {
1862 /*
1863 * TODO: In time, we should notice the caller of this error by
1864 * telling him that this is a version error.
1865 */
1866 continue;
1867 }
edb67388
DG
1868 ua_sess = lookup_session_by_app(usess, app);
1869 /* If ua_sess is NULL, there is a code flow error */
1870 assert(ua_sess);
48842b30
DG
1871
1872 /* Lookup channel in the ust app session */
bec39940
DG
1873 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1874 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1875 /* If the channel is not found, there is a code flow error */
1876 assert(ua_chan_node);
1877
48842b30
DG
1878 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1879
edb67388
DG
1880 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
1881 if (ret < 0) {
fc34caaa
DG
1882 if (ret != -EEXIST) {
1883 /* Possible value at this point: -ENOMEM. If so, we stop! */
1884 break;
1885 }
1886 DBG2("UST app event %s already exist on app PID %d",
1887 uevent->attr.name, app->key.pid);
5b4a0ec0 1888 continue;
48842b30 1889 }
48842b30 1890 }
5b4a0ec0 1891
48842b30
DG
1892 rcu_read_unlock();
1893
1894 return ret;
1895}
1896
5b4a0ec0
DG
1897/*
1898 * Start tracing for a specific UST session and app.
1899 */
421cb601 1900int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
1901{
1902 int ret = 0;
bec39940 1903 struct lttng_ht_iter iter;
48842b30
DG
1904 struct ust_app_session *ua_sess;
1905 struct ust_app_channel *ua_chan;
5b4a0ec0 1906 struct ltt_ust_stream *ustream;
7753dea8 1907 int consumerd_fd;
48842b30 1908
421cb601 1909 DBG("Starting tracing for ust app pid %d", app->key.pid);
5cf5d0e7 1910
509cbaf8
MD
1911 rcu_read_lock();
1912
e0c7ec2b
DG
1913 if (!app->compatible) {
1914 goto end;
1915 }
1916
421cb601
DG
1917 ua_sess = lookup_session_by_app(usess, app);
1918 if (ua_sess == NULL) {
509cbaf8 1919 goto error_rcu_unlock;
421cb601 1920 }
48842b30 1921
aea829b3
DG
1922 /* Upon restart, we skip the setup, already done */
1923 if (ua_sess->started) {
8be98f9a 1924 goto skip_setup;
aea829b3 1925 }
8be98f9a 1926
421cb601
DG
1927 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
1928 if (ret < 0) {
509cbaf8 1929 goto error_rcu_unlock;
421cb601 1930 }
48842b30 1931
421cb601 1932 /* For each channel */
bec39940
DG
1933 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
1934 node.node) {
421cb601
DG
1935 /* Create all streams */
1936 while (1) {
5b4a0ec0 1937 /* Create UST stream */
421cb601
DG
1938 ustream = zmalloc(sizeof(*ustream));
1939 if (ustream == NULL) {
1940 PERROR("zmalloc ust stream");
509cbaf8 1941 goto error_rcu_unlock;
421cb601 1942 }
48842b30 1943
421cb601
DG
1944 ret = ustctl_create_stream(app->key.sock, ua_chan->obj,
1945 &ustream->obj);
48842b30 1946 if (ret < 0) {
421cb601
DG
1947 /* Got all streams */
1948 break;
48842b30 1949 }
421cb601 1950 ustream->handle = ustream->obj->handle;
48842b30 1951
421cb601
DG
1952 /* Order is important */
1953 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
477d7741
MD
1954 ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
1955 ua_sess->path, ua_chan->name,
1956 ua_chan->streams.count++);
aba8e916
DG
1957 if (ret < 0) {
1958 PERROR("asprintf UST create stream");
421cb601 1959 continue;
aba8e916 1960 }
421cb601
DG
1961 DBG2("UST stream %d ready at %s", ua_chan->streams.count,
1962 ustream->pathname);
1963 }
421cb601 1964 }
aba8e916 1965
7753dea8
MD
1966 switch (app->bits_per_long) {
1967 case 64:
1968 consumerd_fd = ust_consumerd64_fd;
1969 break;
1970 case 32:
1971 consumerd_fd = ust_consumerd32_fd;
1972 break;
1973 default:
1974 ret = -EINVAL;
1975 goto error_rcu_unlock;
1976 }
aea829b3 1977
421cb601 1978 /* Setup UST consumer socket and send fds to it */
7753dea8 1979 ret = ust_consumer_send_session(consumerd_fd, ua_sess);
421cb601 1980 if (ret < 0) {
509cbaf8 1981 goto error_rcu_unlock;
421cb601 1982 }
8be98f9a 1983 ua_sess->started = 1;
48842b30 1984
8be98f9a 1985skip_setup:
421cb601
DG
1986 /* This start the UST tracing */
1987 ret = ustctl_start_session(app->key.sock, ua_sess->handle);
1988 if (ret < 0) {
1989 ERR("Error starting tracing for app pid: %d", app->key.pid);
509cbaf8 1990 goto error_rcu_unlock;
421cb601 1991 }
5b4a0ec0 1992
421cb601
DG
1993 /* Quiescent wait after starting trace */
1994 ustctl_wait_quiescent(app->key.sock);
48842b30 1995
e0c7ec2b
DG
1996end:
1997 rcu_read_unlock();
421cb601 1998 return 0;
48842b30 1999
509cbaf8
MD
2000error_rcu_unlock:
2001 rcu_read_unlock();
421cb601
DG
2002 return -1;
2003}
48842b30 2004
8be98f9a
MD
2005/*
2006 * Stop tracing for a specific UST session and app.
2007 */
2008int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2009{
2010 int ret = 0;
bec39940 2011 struct lttng_ht_iter iter;
8be98f9a 2012 struct ust_app_session *ua_sess;
6d3686da 2013 struct ust_app_channel *ua_chan;
8be98f9a
MD
2014
2015 DBG("Stopping tracing for ust app pid %d", app->key.pid);
2016
2017 rcu_read_lock();
2018
e0c7ec2b
DG
2019 if (!app->compatible) {
2020 goto end;
2021 }
2022
8be98f9a
MD
2023 ua_sess = lookup_session_by_app(usess, app);
2024 if (ua_sess == NULL) {
2025 /* Only malloc can failed so something is really wrong */
2026 goto error_rcu_unlock;
2027 }
2028
7db205b5
DG
2029 /* Not started, continuing. */
2030 if (ua_sess->started == 0) {
2031 goto end;
2032 }
2033
9d6c7d3f
DG
2034 /* This inhibits UST tracing */
2035 ret = ustctl_stop_session(app->key.sock, ua_sess->handle);
2036 if (ret < 0) {
2037 ERR("Error stopping tracing for app pid: %d", app->key.pid);
2038 goto error_rcu_unlock;
2039 }
2040
2041 /* Quiescent wait after stopping trace */
2042 ustctl_wait_quiescent(app->key.sock);
2043
2044 /* Flushing buffers */
bec39940
DG
2045 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2046 node.node) {
6d3686da 2047 ret = ustctl_sock_flush_buffer(app->key.sock, ua_chan->obj);
8be98f9a 2048 if (ret < 0) {
7db205b5
DG
2049 ERR("UST app PID %d channel %s flush failed with ret %d",
2050 app->key.pid, ua_chan->name, ret);
6d3686da
DG
2051 /* Continuing flushing all buffers */
2052 continue;
8be98f9a
MD
2053 }
2054 }
8be98f9a 2055
90d97d10
DG
2056 /* Flush all buffers before stopping */
2057 ret = ustctl_sock_flush_buffer(app->key.sock, ua_sess->metadata->obj);
2058 if (ret < 0) {
7db205b5
DG
2059 ERR("UST app PID %d metadata flush failed with ret %d", app->key.pid,
2060 ret);
90d97d10
DG
2061 }
2062
7db205b5 2063 ua_sess->started = 0;
9d6c7d3f 2064
7db205b5
DG
2065end:
2066 rcu_read_unlock();
8be98f9a
MD
2067 return 0;
2068
2069error_rcu_unlock:
2070 rcu_read_unlock();
2071 return -1;
2072}
2073
84cd17c6
MD
2074/*
2075 * Destroy a specific UST session in apps.
2076 */
2077int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2078{
2079 struct ust_app_session *ua_sess;
2080 struct lttng_ust_object_data obj;
bec39940
DG
2081 struct lttng_ht_iter iter;
2082 struct lttng_ht_node_ulong *node;
525b0740 2083 int ret;
84cd17c6
MD
2084
2085 DBG("Destroy tracing for ust app pid %d", app->key.pid);
2086
2087 rcu_read_lock();
2088
e0c7ec2b
DG
2089 if (!app->compatible) {
2090 goto end;
2091 }
2092
84cd17c6 2093 __lookup_session_by_app(usess, app, &iter);
bec39940 2094 node = lttng_ht_iter_get_node_ulong(&iter);
84cd17c6
MD
2095 if (node == NULL) {
2096 /* Only malloc can failed so something is really wrong */
2097 goto error_rcu_unlock;
2098 }
2099 ua_sess = caa_container_of(node, struct ust_app_session, node);
bec39940 2100 ret = lttng_ht_del(app->sessions, &iter);
525b0740 2101 assert(!ret);
84cd17c6
MD
2102 obj.handle = ua_sess->handle;
2103 obj.shm_fd = -1;
2104 obj.wait_fd = -1;
2105 obj.memory_map_size = 0;
2106 ustctl_release_object(app->key.sock, &obj);
2107
7db205b5
DG
2108 delete_ust_app_session(app->key.sock, ua_sess);
2109
84cd17c6
MD
2110 /* Quiescent wait after stopping trace */
2111 ustctl_wait_quiescent(app->key.sock);
2112
e0c7ec2b
DG
2113end:
2114 rcu_read_unlock();
84cd17c6
MD
2115 return 0;
2116
2117error_rcu_unlock:
2118 rcu_read_unlock();
2119 return -1;
2120}
2121
5b4a0ec0
DG
2122/*
2123 * Start tracing for the UST session.
2124 */
421cb601
DG
2125int ust_app_start_trace_all(struct ltt_ust_session *usess)
2126{
2127 int ret = 0;
bec39940 2128 struct lttng_ht_iter iter;
421cb601 2129 struct ust_app *app;
48842b30 2130
421cb601
DG
2131 DBG("Starting all UST traces");
2132
2133 rcu_read_lock();
421cb601 2134
bec39940 2135 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
421cb601 2136 ret = ust_app_start_trace(usess, app);
48842b30 2137 if (ret < 0) {
5b4a0ec0
DG
2138 /* Continue to next apps even on error */
2139 continue;
48842b30 2140 }
48842b30 2141 }
5b4a0ec0 2142
48842b30
DG
2143 rcu_read_unlock();
2144
2145 return 0;
2146}
487cf67c 2147
8be98f9a
MD
2148/*
2149 * Start tracing for the UST session.
2150 */
2151int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2152{
2153 int ret = 0;
bec39940 2154 struct lttng_ht_iter iter;
8be98f9a
MD
2155 struct ust_app *app;
2156
2157 DBG("Stopping all UST traces");
2158
2159 rcu_read_lock();
2160
bec39940 2161 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
8be98f9a
MD
2162 ret = ust_app_stop_trace(usess, app);
2163 if (ret < 0) {
2164 /* Continue to next apps even on error */
2165 continue;
2166 }
2167 }
2168
2169 rcu_read_unlock();
2170
2171 return 0;
2172}
2173
84cd17c6
MD
2174/*
2175 * Destroy app UST session.
2176 */
2177int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2178{
2179 int ret = 0;
bec39940 2180 struct lttng_ht_iter iter;
84cd17c6
MD
2181 struct ust_app *app;
2182
2183 DBG("Destroy all UST traces");
2184
2185 rcu_read_lock();
2186
bec39940 2187 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
84cd17c6
MD
2188 ret = ust_app_destroy_trace(usess, app);
2189 if (ret < 0) {
2190 /* Continue to next apps even on error */
2191 continue;
2192 }
2193 }
2194
2195 rcu_read_unlock();
2196
2197 return 0;
2198}
2199
5b4a0ec0
DG
2200/*
2201 * Add channels/events from UST global domain to registered apps at sock.
2202 */
487cf67c
DG
2203void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2204{
2205 int ret = 0;
bec39940 2206 struct lttng_ht_iter iter, uiter;
487cf67c
DG
2207 struct ust_app *app;
2208 struct ust_app_session *ua_sess;
2209 struct ust_app_channel *ua_chan;
2210 struct ust_app_event *ua_event;
1f3580c7
DG
2211
2212 if (usess == NULL) {
5b4a0ec0 2213 ERR("No UST session on global update. Returning");
1f3580c7
DG
2214 goto error;
2215 }
2216
a991f516
MD
2217 DBG2("UST app global update for app sock %d for session id %d", sock,
2218 usess->id);
487cf67c 2219
284d8f55
DG
2220 rcu_read_lock();
2221
487cf67c
DG
2222 app = find_app_by_sock(sock);
2223 if (app == NULL) {
2224 ERR("Failed to update app sock %d", sock);
2225 goto error;
2226 }
2227
e0c7ec2b
DG
2228 if (!app->compatible) {
2229 goto error;
2230 }
2231
421cb601 2232 ua_sess = create_ust_app_session(usess, app);
487cf67c 2233 if (ua_sess == NULL) {
487cf67c
DG
2234 goto error;
2235 }
2236
284d8f55
DG
2237 /*
2238 * We can iterate safely here over all UST app session sicne the create ust
2239 * app session above made a shadow copy of the UST global domain from the
2240 * ltt ust session.
2241 */
bec39940
DG
2242 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2243 node.node) {
284d8f55
DG
2244 ret = create_ust_channel(app, ua_sess, ua_chan);
2245 if (ret < 0) {
2246 /* FIXME: Should we quit here or continue... */
2247 continue;
487cf67c
DG
2248 }
2249
284d8f55 2250 /* For each events */
bec39940
DG
2251 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2252 node.node) {
284d8f55
DG
2253 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2254 if (ret < 0) {
2255 /* FIXME: Should we quit here or continue... */
2256 continue;
487cf67c 2257 }
36dc12cc 2258 }
487cf67c
DG
2259 }
2260
36dc12cc 2261 if (usess->start_trace) {
421cb601 2262 ret = ust_app_start_trace(usess, app);
36dc12cc 2263 if (ret < 0) {
36dc12cc
DG
2264 goto error;
2265 }
2266
36dc12cc
DG
2267 DBG2("UST trace started for app pid %d", app->key.pid);
2268 }
2269
487cf67c
DG
2270error:
2271 rcu_read_unlock();
2272 return;
2273}
55cc08a6
DG
2274
2275/*
2276 * Add context to a specific channel for global UST domain.
2277 */
2278int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2279 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2280{
2281 int ret = 0;
bec39940
DG
2282 struct lttng_ht_node_str *ua_chan_node;
2283 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2284 struct ust_app_channel *ua_chan = NULL;
2285 struct ust_app_session *ua_sess;
2286 struct ust_app *app;
2287
2288 rcu_read_lock();
2289
bec39940 2290 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
e0c7ec2b
DG
2291 if (!app->compatible) {
2292 /*
2293 * TODO: In time, we should notice the caller of this error by
2294 * telling him that this is a version error.
2295 */
2296 continue;
2297 }
55cc08a6
DG
2298 ua_sess = lookup_session_by_app(usess, app);
2299 if (ua_sess == NULL) {
2300 continue;
2301 }
2302
2303 /* Lookup channel in the ust app session */
bec39940
DG
2304 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2305 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2306 if (ua_chan_node == NULL) {
2307 continue;
2308 }
2309 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2310 node);
2311
2312 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2313 if (ret < 0) {
2314 continue;
2315 }
2316 }
2317
55cc08a6
DG
2318 rcu_read_unlock();
2319 return ret;
2320}
2321
2322/*
2323 * Add context to a specific event in a channel for global UST domain.
2324 */
2325int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2326 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2327 struct ltt_ust_context *uctx)
2328{
2329 int ret = 0;
bec39940
DG
2330 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2331 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2332 struct ust_app_session *ua_sess;
2333 struct ust_app_event *ua_event;
2334 struct ust_app_channel *ua_chan = NULL;
2335 struct ust_app *app;
2336
2337 rcu_read_lock();
2338
bec39940 2339 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
e0c7ec2b
DG
2340 if (!app->compatible) {
2341 /*
2342 * TODO: In time, we should notice the caller of this error by
2343 * telling him that this is a version error.
2344 */
2345 continue;
2346 }
55cc08a6
DG
2347 ua_sess = lookup_session_by_app(usess, app);
2348 if (ua_sess == NULL) {
2349 continue;
2350 }
2351
2352 /* Lookup channel in the ust app session */
bec39940
DG
2353 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2354 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2355 if (ua_chan_node == NULL) {
2356 continue;
2357 }
2358 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2359 node);
2360
bec39940
DG
2361 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2362 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2363 if (ua_event_node == NULL) {
2364 continue;
2365 }
2366 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2367 node);
2368
2369 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2370 if (ret < 0) {
2371 continue;
2372 }
2373 }
2374
55cc08a6
DG
2375 rcu_read_unlock();
2376 return ret;
2377}
76d45b40
DG
2378
2379/*
2380 * Enable event for a channel from a UST session for a specific PID.
2381 */
2382int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2383 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2384{
2385 int ret = 0;
bec39940
DG
2386 struct lttng_ht_iter iter;
2387 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
76d45b40
DG
2388 struct ust_app *app;
2389 struct ust_app_session *ua_sess;
2390 struct ust_app_channel *ua_chan;
2391 struct ust_app_event *ua_event;
2392
2393 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2394
2395 rcu_read_lock();
2396
2397 app = ust_app_find_by_pid(pid);
2398 if (app == NULL) {
2399 ERR("UST app enable event per PID %d not found", pid);
2400 ret = -1;
2401 goto error;
2402 }
2403
e0c7ec2b
DG
2404 if (!app->compatible) {
2405 ret = 0;
2406 goto error;
2407 }
2408
76d45b40
DG
2409 ua_sess = lookup_session_by_app(usess, app);
2410 /* If ua_sess is NULL, there is a code flow error */
2411 assert(ua_sess);
2412
2413 /* Lookup channel in the ust app session */
bec39940
DG
2414 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2415 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2416 /* If the channel is not found, there is a code flow error */
2417 assert(ua_chan_node);
2418
2419 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2420
bec39940
DG
2421 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2422 ua_event_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2423 if (ua_event_node == NULL) {
2424 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2425 if (ret < 0) {
2426 goto error;
2427 }
2428 } else {
2429 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2430
2431 ret = enable_ust_app_event(ua_sess, ua_event, app);
2432 if (ret < 0) {
2433 goto error;
2434 }
2435 }
2436
2437error:
2438 rcu_read_unlock();
2439 return ret;
2440}
7f79d3a1
DG
2441
2442/*
2443 * Disable event for a channel from a UST session for a specific PID.
2444 */
2445int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2446 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2447{
2448 int ret = 0;
bec39940
DG
2449 struct lttng_ht_iter iter;
2450 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
7f79d3a1
DG
2451 struct ust_app *app;
2452 struct ust_app_session *ua_sess;
2453 struct ust_app_channel *ua_chan;
2454 struct ust_app_event *ua_event;
2455
2456 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2457
2458 rcu_read_lock();
2459
2460 app = ust_app_find_by_pid(pid);
2461 if (app == NULL) {
2462 ERR("UST app disable event per PID %d not found", pid);
2463 ret = -1;
2464 goto error;
2465 }
2466
e0c7ec2b
DG
2467 if (!app->compatible) {
2468 ret = 0;
2469 goto error;
2470 }
2471
7f79d3a1
DG
2472 ua_sess = lookup_session_by_app(usess, app);
2473 /* If ua_sess is NULL, there is a code flow error */
2474 assert(ua_sess);
2475
2476 /* Lookup channel in the ust app session */
bec39940
DG
2477 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2478 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2479 if (ua_chan_node == NULL) {
2480 /* Channel does not exist, skip disabling */
2481 goto error;
2482 }
2483 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2484
bec39940
DG
2485 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2486 ua_event_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2487 if (ua_event_node == NULL) {
2488 /* Event does not exist, skip disabling */
2489 goto error;
2490 }
2491 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2492
2493 ret = disable_ust_app_event(ua_sess, ua_event, app);
2494 if (ret < 0) {
2495 goto error;
2496 }
2497
2498error:
2499 rcu_read_unlock();
2500 return ret;
2501}
e0c7ec2b
DG
2502
2503/*
2504 * Validate version of UST apps and set the compatible bit.
2505 */
2506int ust_app_validate_version(int sock)
2507{
2508 int ret;
2509 struct ust_app *app;
2510
2511 rcu_read_lock();
2512
2513 app = find_app_by_sock(sock);
2514 assert(app);
2515
2516 ret = ustctl_tracer_version(sock, &app->version);
2517 if (ret < 0) {
2518 goto error;
2519 }
2520
2521 /* Validate version */
2522 if (app->version.major > UST_APP_MAJOR_VERSION) {
2523 goto error;
2524 }
2525
2526 DBG2("UST app PID %d is compatible with major version %d "
2527 "(supporting <= %d)", app->key.pid, app->version.major,
2528 UST_APP_MAJOR_VERSION);
2529 app->compatible = 1;
2530 rcu_read_unlock();
2531 return 0;
2532
2533error:
2534 DBG2("UST app PID %d is not compatible with major version %d "
2535 "(supporting <= %d)", app->key.pid, app->version.major,
2536 UST_APP_MAJOR_VERSION);
2537 app->compatible = 0;
2538 rcu_read_unlock();
2539 return -1;
2540}
4466912f
DG
2541
2542/*
2543 * Calibrate registered applications.
2544 */
2545int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2546{
2547 int ret = 0;
2548 struct lttng_ht_iter iter;
2549 struct ust_app *app;
2550
2551 rcu_read_lock();
2552
2553 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2554 if (!app->compatible) {
2555 /*
2556 * TODO: In time, we should notice the caller of this error by
2557 * telling him that this is a version error.
2558 */
2559 continue;
2560 }
2561
2562 ret = ustctl_calibrate(app->key.sock, calibrate);
2563 if (ret < 0) {
2564 switch (ret) {
2565 case -ENOSYS:
2566 /* Means that it's not implemented on the tracer side. */
2567 ret = 0;
2568 break;
2569 default:
2570 /* TODO: Report error to user */
2571 DBG2("Calibrate app PID %d returned with error %d",
2572 app->key.pid, ret);
2573 break;
2574 }
2575 }
2576 }
2577
2578 DBG("UST app global domain calibration finished");
2579
2580 rcu_read_unlock();
2581
2582 return ret;
2583}
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