Update lttng-ust-abi.h for event field listing
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c
CommitLineData
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
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7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
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13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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16 */
17
18#define _GNU_SOURCE
19#include <errno.h>
20#include <pthread.h>
21#include <stdio.h>
22#include <stdlib.h>
099e26bd 23#include <string.h>
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24#include <sys/stat.h>
25#include <sys/types.h>
099e26bd 26#include <unistd.h>
0df502fd 27#include <urcu/compiler.h>
bec39940 28
990570ed 29#include <common/common.h>
1e307fab 30
56fff090 31#include "ust-app.h"
48842b30 32#include "ust-consumer.h"
d80a6244 33#include "ust-ctl.h"
4063050c 34#include "fd-limit.h"
d80a6244 35
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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);
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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);
4063050c 86 lttng_fd_put(LTTNG_FD_APPS, 2);
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87 free(stream->obj);
88 }
84cd17c6 89 free(stream);
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90}
91
92/*
93 * Delete ust app channel safely. RCU read lock must be held before calling
94 * this function.
95 */
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96static
97void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
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98{
99 int ret;
bec39940 100 struct lttng_ht_iter iter;
d80a6244 101 struct ust_app_event *ua_event;
55cc08a6 102 struct ust_app_ctx *ua_ctx;
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103 struct ltt_ust_stream *stream, *stmp;
104
55cc08a6 105 /* Wipe stream */
d80a6244 106 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 107 cds_list_del(&stream->list);
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108 delete_ust_app_stream(sock, stream);
109 }
110
55cc08a6 111 /* Wipe context */
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112 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
113 ret = lttng_ht_del(ua_chan->ctx, &iter);
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114 assert(!ret);
115 delete_ust_app_ctx(sock, ua_ctx);
116 }
bec39940 117 lttng_ht_destroy(ua_chan->ctx);
d80a6244 118
55cc08a6 119 /* Wipe events */
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120 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
121 node.node) {
122 ret = lttng_ht_del(ua_chan->events, &iter);
525b0740 123 assert(!ret);
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124 delete_ust_app_event(sock, ua_event);
125 }
bec39940 126 lttng_ht_destroy(ua_chan->events);
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127
128 if (ua_chan->obj != NULL) {
129 ustctl_release_object(sock, ua_chan->obj);
4063050c 130 lttng_fd_put(LTTNG_FD_APPS, 2);
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131 free(ua_chan->obj);
132 }
84cd17c6 133 free(ua_chan);
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134}
135
136/*
137 * Delete ust app session safely. RCU read lock must be held before calling
138 * this function.
139 */
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140static
141void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
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142{
143 int ret;
bec39940 144 struct lttng_ht_iter iter;
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145 struct ust_app_channel *ua_chan;
146
147 if (ua_sess->metadata) {
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148 if (ua_sess->metadata->stream_obj) {
149 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
4063050c 150 lttng_fd_put(LTTNG_FD_APPS, 2);
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151 free(ua_sess->metadata->stream_obj);
152 }
153 if (ua_sess->metadata->obj) {
154 ustctl_release_object(sock, ua_sess->metadata->obj);
4063050c 155 lttng_fd_put(LTTNG_FD_APPS, 2);
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156 free(ua_sess->metadata->obj);
157 }
a2c0da86 158 trace_ust_destroy_metadata(ua_sess->metadata);
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159 }
160
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161 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
162 node.node) {
163 ret = lttng_ht_del(ua_sess->channels, &iter);
525b0740 164 assert(!ret);
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165 delete_ust_app_channel(sock, ua_chan);
166 }
bec39940 167 lttng_ht_destroy(ua_sess->channels);
d80a6244 168
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169 if (ua_sess->handle != -1) {
170 ustctl_release_handle(sock, ua_sess->handle);
171 }
8b366481 172 free(ua_sess);
d80a6244 173}
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174
175/*
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176 * Delete a traceable application structure from the global list. Never call
177 * this function outside of a call_rcu call.
91d76f53 178 */
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179static
180void delete_ust_app(struct ust_app *app)
91d76f53 181{
8b366481 182 int ret, sock;
bec39940 183 struct lttng_ht_iter iter;
284d8f55 184 struct ust_app_session *ua_sess;
44d3bd01 185
f6a9efaa 186 rcu_read_lock();
44d3bd01 187
d80a6244 188 /* Delete ust app sessions info */
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189 sock = app->sock;
190 app->sock = -1;
d80a6244 191
8b366481 192 /* Wipe sessions */
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193 cds_lfht_for_each_entry(app->sessions->ht, &iter.iter, ua_sess,
194 node.node) {
195 ret = lttng_ht_del(app->sessions, &iter);
525b0740 196 assert(!ret);
852d0037 197 delete_ust_app_session(app->sock, ua_sess);
d80a6244 198 }
bec39940 199 lttng_ht_destroy(app->sessions);
d80a6244 200
6414a713 201 /*
852d0037
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202 * Wait until we have deleted the application from the sock hash table
203 * before closing this socket, otherwise an application could re-use the
204 * socket ID and race with the teardown, using the same hash table entry.
205 *
206 * It's OK to leave the close in call_rcu. We want it to stay unique for
207 * all RCU readers that could run concurrently with unregister app,
208 * therefore we _need_ to only close that socket after a grace period. So
209 * it should stay in this RCU callback.
210 *
211 * This close() is a very important step of the synchronization model so
212 * every modification to this function must be carefully reviewed.
6414a713 213 */
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214 ret = close(sock);
215 if (ret) {
216 PERROR("close");
217 }
4063050c 218 lttng_fd_put(LTTNG_FD_APPS, 1);
d80a6244 219
852d0037 220 DBG2("UST app pid %d deleted", app->pid);
284d8f55 221 free(app);
bec39940 222
f6a9efaa 223 rcu_read_unlock();
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224}
225
226/*
f6a9efaa 227 * URCU intermediate call to delete an UST app.
099e26bd 228 */
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229static
230void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 231{
bec39940
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232 struct lttng_ht_node_ulong *node =
233 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa 234 struct ust_app *app =
852d0037 235 caa_container_of(node, struct ust_app, pid_n);
f6a9efaa 236
852d0037 237 DBG3("Call RCU deleting app PID %d", app->pid);
f6a9efaa 238 delete_ust_app(app);
099e26bd
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239}
240
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241/*
242 * Alloc new UST app session.
243 */
244static
245struct ust_app_session *alloc_ust_app_session(void)
246{
247 struct ust_app_session *ua_sess;
248
249 /* Init most of the default value by allocating and zeroing */
250 ua_sess = zmalloc(sizeof(struct ust_app_session));
251 if (ua_sess == NULL) {
252 PERROR("malloc");
253 goto error;
254 }
255
256 ua_sess->handle = -1;
bec39940 257 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
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258
259 return ua_sess;
260
261error:
262 return NULL;
263}
264
265/*
266 * Alloc new UST app channel.
267 */
268static
269struct ust_app_channel *alloc_ust_app_channel(char *name,
270 struct lttng_ust_channel *attr)
271{
272 struct ust_app_channel *ua_chan;
273
274 /* Init most of the default value by allocating and zeroing */
275 ua_chan = zmalloc(sizeof(struct ust_app_channel));
276 if (ua_chan == NULL) {
277 PERROR("malloc");
278 goto error;
279 }
280
281 /* Setup channel name */
282 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
283 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
284
285 ua_chan->enabled = 1;
286 ua_chan->handle = -1;
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287 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
288 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
289 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
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290
291 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
292
293 /* Copy attributes */
294 if (attr) {
295 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
296 }
297
298 DBG3("UST app channel %s allocated", ua_chan->name);
299
300 return ua_chan;
301
302error:
303 return NULL;
304}
305
306/*
307 * Alloc new UST app event.
308 */
309static
310struct ust_app_event *alloc_ust_app_event(char *name,
311 struct lttng_ust_event *attr)
312{
313 struct ust_app_event *ua_event;
314
315 /* Init most of the default value by allocating and zeroing */
316 ua_event = zmalloc(sizeof(struct ust_app_event));
317 if (ua_event == NULL) {
318 PERROR("malloc");
319 goto error;
320 }
321
322 ua_event->enabled = 1;
323 strncpy(ua_event->name, name, sizeof(ua_event->name));
324 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
bec39940
DG
325 ua_event->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
326 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
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327
328 /* Copy attributes */
329 if (attr) {
330 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
331 }
332
333 DBG3("UST app event %s allocated", ua_event->name);
334
335 return ua_event;
336
337error:
338 return NULL;
339}
340
341/*
342 * Alloc new UST app context.
343 */
344static
345struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
346{
347 struct ust_app_ctx *ua_ctx;
348
349 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
350 if (ua_ctx == NULL) {
351 goto error;
352 }
353
354 if (uctx) {
355 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
356 }
357
358 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
359
360error:
361 return ua_ctx;
362}
363
099e26bd 364/*
421cb601
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365 * Find an ust_app using the sock and return it. RCU read side lock must be
366 * held before calling this helper function.
099e26bd 367 */
8b366481
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368static
369struct ust_app *find_app_by_sock(int sock)
099e26bd 370{
bec39940 371 struct lttng_ht_node_ulong *node;
bec39940 372 struct lttng_ht_iter iter;
f6a9efaa 373
852d0037 374 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 375 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
376 if (node == NULL) {
377 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
378 goto error;
379 }
852d0037
DG
380
381 return caa_container_of(node, struct ust_app, sock_n);
f6a9efaa
DG
382
383error:
384 return NULL;
099e26bd
DG
385}
386
55cc08a6
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387/*
388 * Create the channel context on the tracer.
389 */
390static
391int create_ust_channel_context(struct ust_app_channel *ua_chan,
392 struct ust_app_ctx *ua_ctx, struct ust_app *app)
393{
394 int ret;
395
852d0037 396 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
55cc08a6
DG
397 ua_chan->obj, &ua_ctx->obj);
398 if (ret < 0) {
399 goto error;
400 }
401
402 ua_ctx->handle = ua_ctx->obj->handle;
403
727d5404 404 DBG2("UST app context created successfully for channel %s", ua_chan->name);
55cc08a6
DG
405
406error:
407 return ret;
408}
409
410/*
411 * Create the event context on the tracer.
412 */
413static
414int create_ust_event_context(struct ust_app_event *ua_event,
415 struct ust_app_ctx *ua_ctx, struct ust_app *app)
416{
417 int ret;
418
852d0037 419 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
55cc08a6
DG
420 ua_event->obj, &ua_ctx->obj);
421 if (ret < 0) {
422 goto error;
423 }
424
425 ua_ctx->handle = ua_ctx->obj->handle;
426
727d5404 427 DBG2("UST app context created successfully for event %s", ua_event->name);
55cc08a6
DG
428
429error:
430 return ret;
431}
432
9730260e
DG
433/*
434 * Disable the specified event on to UST tracer for the UST session.
435 */
436static int disable_ust_event(struct ust_app *app,
437 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
438{
439 int ret;
440
852d0037 441 ret = ustctl_disable(app->sock, ua_event->obj);
9730260e
DG
442 if (ret < 0) {
443 ERR("UST app event %s disable failed for app (pid: %d) "
444 "and session handle %d with ret %d",
852d0037 445 ua_event->attr.name, app->pid, ua_sess->handle, ret);
9730260e
DG
446 goto error;
447 }
448
449 DBG2("UST app event %s disabled successfully for app (pid: %d)",
852d0037 450 ua_event->attr.name, app->pid);
9730260e
DG
451
452error:
453 return ret;
454}
455
78f0bacd
DG
456/*
457 * Disable the specified channel on to UST tracer for the UST session.
458 */
459static int disable_ust_channel(struct ust_app *app,
460 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
461{
462 int ret;
463
852d0037 464 ret = ustctl_disable(app->sock, ua_chan->obj);
78f0bacd
DG
465 if (ret < 0) {
466 ERR("UST app channel %s disable failed for app (pid: %d) "
467 "and session handle %d with ret %d",
852d0037 468 ua_chan->name, app->pid, ua_sess->handle, ret);
78f0bacd
DG
469 goto error;
470 }
471
78f0bacd 472 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
852d0037 473 ua_chan->name, app->pid);
78f0bacd
DG
474
475error:
476 return ret;
477}
478
479/*
480 * Enable the specified channel on to UST tracer for the UST session.
481 */
482static int enable_ust_channel(struct ust_app *app,
483 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
484{
485 int ret;
486
852d0037 487 ret = ustctl_enable(app->sock, ua_chan->obj);
78f0bacd
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488 if (ret < 0) {
489 ERR("UST app channel %s enable failed for app (pid: %d) "
490 "and session handle %d with ret %d",
852d0037 491 ua_chan->name, app->pid, ua_sess->handle, ret);
78f0bacd
DG
492 goto error;
493 }
494
495 ua_chan->enabled = 1;
496
497 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
852d0037 498 ua_chan->name, app->pid);
78f0bacd
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499
500error:
501 return ret;
502}
503
edb67388
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504/*
505 * Enable the specified event on to UST tracer for the UST session.
506 */
507static int enable_ust_event(struct ust_app *app,
508 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
509{
510 int ret;
511
852d0037 512 ret = ustctl_enable(app->sock, ua_event->obj);
edb67388
DG
513 if (ret < 0) {
514 ERR("UST app event %s enable failed for app (pid: %d) "
515 "and session handle %d with ret %d",
852d0037 516 ua_event->attr.name, app->pid, ua_sess->handle, ret);
edb67388
DG
517 goto error;
518 }
519
520 DBG2("UST app event %s enabled successfully for app (pid: %d)",
852d0037 521 ua_event->attr.name, app->pid);
edb67388
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522
523error:
524 return ret;
525}
526
099e26bd 527/*
5b4a0ec0 528 * Open metadata onto the UST tracer for a UST session.
0177d773 529 */
5b4a0ec0
DG
530static int open_ust_metadata(struct ust_app *app,
531 struct ust_app_session *ua_sess)
0177d773 532{
5b4a0ec0
DG
533 int ret;
534 struct lttng_ust_channel_attr uattr;
0177d773 535
5b4a0ec0
DG
536 uattr.overwrite = ua_sess->metadata->attr.overwrite;
537 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
538 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
539 uattr.switch_timer_interval =
540 ua_sess->metadata->attr.switch_timer_interval;
541 uattr.read_timer_interval =
542 ua_sess->metadata->attr.read_timer_interval;
543 uattr.output = ua_sess->metadata->attr.output;
544
4063050c
MD
545 /* We are going to receive 2 fds, we need to reserve them. */
546 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
547 if (ret < 0) {
548 ERR("Exhausted number of available FD upon metadata open");
549 goto error;
550 }
5b4a0ec0 551 /* UST tracer metadata creation */
852d0037 552 ret = ustctl_open_metadata(app->sock, ua_sess->handle, &uattr,
5b4a0ec0
DG
553 &ua_sess->metadata->obj);
554 if (ret < 0) {
fc34caaa 555 ERR("UST app open metadata failed for app pid:%d with ret %d",
852d0037 556 app->pid, ret);
f6a9efaa 557 goto error;
0177d773 558 }
f6a9efaa 559
6d3686da
DG
560 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
561
f6a9efaa 562error:
5b4a0ec0 563 return ret;
91d76f53
DG
564}
565
566/*
5b4a0ec0 567 * Create stream onto the UST tracer for a UST session.
91d76f53 568 */
5b4a0ec0
DG
569static int create_ust_stream(struct ust_app *app,
570 struct ust_app_session *ua_sess)
91d76f53 571{
5b4a0ec0 572 int ret;
421cb601 573
4063050c
MD
574 /* We are going to receive 2 fds, we need to reserve them. */
575 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
576 if (ret < 0) {
577 ERR("Exhausted number of available FD upon metadata stream create");
578 goto error;
579 }
852d0037 580 ret = ustctl_create_stream(app->sock, ua_sess->metadata->obj,
5b4a0ec0
DG
581 &ua_sess->metadata->stream_obj);
582 if (ret < 0) {
583 ERR("UST create metadata stream failed");
421cb601 584 goto error;
91d76f53 585 }
421cb601 586
421cb601 587error:
5b4a0ec0 588 return ret;
91d76f53
DG
589}
590
b551a063 591/*
5b4a0ec0 592 * Create the specified channel onto the UST tracer for a UST session.
b551a063 593 */
5b4a0ec0
DG
594static int create_ust_channel(struct ust_app *app,
595 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
b551a063 596{
5b4a0ec0 597 int ret;
b551a063 598
5b4a0ec0 599 /* TODO: remove cast and use lttng-ust-abi.h */
4063050c
MD
600
601 /* We are going to receive 2 fds, we need to reserve them. */
602 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
603 if (ret < 0) {
604 ERR("Exhausted number of available FD upon create channel");
605 goto error;
606 }
852d0037 607 ret = ustctl_create_channel(app->sock, ua_sess->handle,
5b4a0ec0
DG
608 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
609 if (ret < 0) {
58f3ca76 610 ERR("Creating channel %s for app (pid: %d, sock: %d) "
5b4a0ec0 611 "and session handle %d with ret %d",
852d0037 612 ua_chan->name, app->pid, app->sock,
5b4a0ec0 613 ua_sess->handle, ret);
4063050c 614 lttng_fd_put(LTTNG_FD_APPS, 2);
b551a063
DG
615 goto error;
616 }
617
5b4a0ec0 618 ua_chan->handle = ua_chan->obj->handle;
b551a063 619
5b4a0ec0 620 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
852d0037 621 ua_chan->name, app->pid, app->sock);
b551a063 622
8535a6d9
DG
623 /* If channel is not enabled, disable it on the tracer */
624 if (!ua_chan->enabled) {
625 ret = disable_ust_channel(app, ua_sess, ua_chan);
626 if (ret < 0) {
627 goto error;
628 }
629 }
630
b551a063
DG
631error:
632 return ret;
633}
634
91d76f53 635/*
5b4a0ec0 636 * Create the specified event onto the UST tracer for a UST session.
91d76f53 637 */
edb67388
DG
638static
639int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
640 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 641{
5b4a0ec0 642 int ret = 0;
284d8f55 643
5b4a0ec0 644 /* Create UST event on tracer */
852d0037 645 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0
DG
646 &ua_event->obj);
647 if (ret < 0) {
fc34caaa
DG
648 if (ret == -EEXIST) {
649 ret = 0;
650 goto error;
651 }
5b4a0ec0 652 ERR("Error ustctl create event %s for app pid: %d with ret %d",
852d0037 653 ua_event->attr.name, app->pid, ret);
5b4a0ec0 654 goto error;
91d76f53 655 }
f6a9efaa 656
5b4a0ec0 657 ua_event->handle = ua_event->obj->handle;
284d8f55 658
5b4a0ec0 659 DBG2("UST app event %s created successfully for pid:%d",
852d0037 660 ua_event->attr.name, app->pid);
f6a9efaa 661
8535a6d9 662 /* If event not enabled, disable it on the tracer */
fc34caaa 663 if (ua_event->enabled == 0) {
8535a6d9
DG
664 ret = disable_ust_event(app, ua_sess, ua_event);
665 if (ret < 0) {
fc34caaa
DG
666 /*
667 * If we hit an EPERM, something is wrong with our disable call. If
668 * we get an EEXIST, there is a problem on the tracer side since we
669 * just created it.
670 */
671 switch (ret) {
672 case -EPERM:
673 /* Code flow problem */
674 assert(0);
675 case -EEXIST:
676 /* It's OK for our use case. */
677 ret = 0;
678 break;
679 default:
680 break;
681 }
8535a6d9
DG
682 goto error;
683 }
684 }
685
5b4a0ec0
DG
686error:
687 return ret;
91d76f53 688}
48842b30 689
5b4a0ec0
DG
690/*
691 * Copy data between an UST app event and a LTT event.
692 */
421cb601 693static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
694 struct ltt_ust_event *uevent)
695{
bec39940 696 struct lttng_ht_iter iter;
55cc08a6
DG
697 struct ltt_ust_context *uctx;
698 struct ust_app_ctx *ua_ctx;
699
48842b30
DG
700 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
701 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
702
fc34caaa
DG
703 ua_event->enabled = uevent->enabled;
704
5b4a0ec0
DG
705 /* Copy event attributes */
706 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
707
bec39940 708 cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
709 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
710 if (ua_ctx == NULL) {
fc34caaa
DG
711 /* malloc() failed. We should simply stop */
712 return;
55cc08a6 713 }
fc34caaa 714
bec39940
DG
715 lttng_ht_node_init_ulong(&ua_ctx->node,
716 (unsigned long) ua_ctx->ctx.ctx);
717 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6 718 }
48842b30
DG
719}
720
5b4a0ec0
DG
721/*
722 * Copy data between an UST app channel and a LTT channel.
723 */
421cb601 724static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
725 struct ltt_ust_channel *uchan)
726{
bec39940
DG
727 struct lttng_ht_iter iter;
728 struct lttng_ht_node_str *ua_event_node;
48842b30 729 struct ltt_ust_event *uevent;
55cc08a6 730 struct ltt_ust_context *uctx;
48842b30 731 struct ust_app_event *ua_event;
55cc08a6 732 struct ust_app_ctx *ua_ctx;
48842b30 733
fc34caaa 734 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
735
736 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
737 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
5b4a0ec0
DG
738 /* Copy event attributes */
739 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
48842b30 740
fc34caaa
DG
741 ua_chan->enabled = uchan->enabled;
742
bec39940 743 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
744 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
745 if (ua_ctx == NULL) {
746 continue;
747 }
bec39940
DG
748 lttng_ht_node_init_ulong(&ua_ctx->node,
749 (unsigned long) ua_ctx->ctx.ctx);
750 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6 751 }
48842b30 752
421cb601 753 /* Copy all events from ltt ust channel to ust app channel */
bec39940
DG
754 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
755 struct lttng_ht_iter uiter;
ba767faf 756
bec39940
DG
757 lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter);
758 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
48842b30 759 if (ua_event_node == NULL) {
421cb601 760 DBG2("UST event %s not found on shadow copy channel",
48842b30 761 uevent->attr.name);
284d8f55 762 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 763 if (ua_event == NULL) {
5b4a0ec0 764 continue;
48842b30 765 }
421cb601 766 shadow_copy_event(ua_event, uevent);
bec39940 767 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
48842b30 768 }
48842b30
DG
769 }
770
fc34caaa 771 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
772}
773
5b4a0ec0
DG
774/*
775 * Copy data between a UST app session and a regular LTT session.
776 */
421cb601 777static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 778 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 779{
bec39940
DG
780 struct lttng_ht_node_str *ua_chan_node;
781 struct lttng_ht_iter iter;
48842b30
DG
782 struct ltt_ust_channel *uchan;
783 struct ust_app_channel *ua_chan;
477d7741
MD
784 time_t rawtime;
785 struct tm *timeinfo;
786 char datetime[16];
787 int ret;
788
789 /* Get date and time for unique app path */
790 time(&rawtime);
791 timeinfo = localtime(&rawtime);
792 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 793
421cb601 794 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 795
a991f516 796 ua_sess->id = usess->id;
6df2e2c9
MD
797 ua_sess->uid = usess->uid;
798 ua_sess->gid = usess->gid;
48842b30 799
fc34caaa 800 ret = snprintf(ua_sess->path, PATH_MAX, "%s/%s-%d-%s", usess->pathname,
852d0037 801 app->name, app->pid, datetime);
477d7741
MD
802 if (ret < 0) {
803 PERROR("asprintf UST shadow copy session");
804 /* TODO: We cannot return an error from here.. */
805 assert(0);
806 }
807
48842b30
DG
808 /* TODO: support all UST domain */
809
810 /* Iterate over all channels in global domain. */
bec39940
DG
811 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
812 uchan, node.node) {
813 struct lttng_ht_iter uiter;
ba767faf 814
bec39940
DG
815 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
816 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
5b4a0ec0 817 if (ua_chan_node != NULL) {
fc34caaa 818 /* Session exist. Contiuing. */
5b4a0ec0
DG
819 continue;
820 }
421cb601 821
5b4a0ec0
DG
822 DBG2("Channel %s not found on shadow session copy, creating it",
823 uchan->name);
824 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
825 if (ua_chan == NULL) {
fc34caaa 826 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
5b4a0ec0 827 continue;
48842b30
DG
828 }
829
5b4a0ec0 830 shadow_copy_channel(ua_chan, uchan);
bec39940 831 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
48842b30
DG
832 }
833}
834
78f0bacd
DG
835/*
836 * Lookup sesison wrapper.
837 */
84cd17c6
MD
838static
839void __lookup_session_by_app(struct ltt_ust_session *usess,
bec39940 840 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
841{
842 /* Get right UST app session from app */
2c348c10 843 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
84cd17c6
MD
844}
845
421cb601
DG
846/*
847 * Return ust app session from the app session hashtable using the UST session
a991f516 848 * id.
421cb601 849 */
48842b30
DG
850static struct ust_app_session *lookup_session_by_app(
851 struct ltt_ust_session *usess, struct ust_app *app)
852{
bec39940
DG
853 struct lttng_ht_iter iter;
854 struct lttng_ht_node_ulong *node;
48842b30 855
84cd17c6 856 __lookup_session_by_app(usess, app, &iter);
bec39940 857 node = lttng_ht_iter_get_node_ulong(&iter);
48842b30
DG
858 if (node == NULL) {
859 goto error;
860 }
861
862 return caa_container_of(node, struct ust_app_session, node);
863
864error:
865 return NULL;
866}
867
421cb601
DG
868/*
869 * Create a UST session onto the tracer of app and add it the session
870 * hashtable.
871 *
872 * Return ust app session or NULL on error.
873 */
874static struct ust_app_session *create_ust_app_session(
875 struct ltt_ust_session *usess, struct ust_app *app)
876{
877 int ret;
878 struct ust_app_session *ua_sess;
879
880 ua_sess = lookup_session_by_app(usess, app);
881 if (ua_sess == NULL) {
a991f516 882 DBG2("UST app pid: %d session id %d not found, creating it",
852d0037 883 app->pid, usess->id);
421cb601
DG
884 ua_sess = alloc_ust_app_session();
885 if (ua_sess == NULL) {
886 /* Only malloc can failed so something is really wrong */
fc34caaa 887 goto end;
421cb601 888 }
477d7741 889 shadow_copy_session(ua_sess, usess, app);
421cb601
DG
890 }
891
892 if (ua_sess->handle == -1) {
852d0037 893 ret = ustctl_create_session(app->sock);
421cb601 894 if (ret < 0) {
852d0037 895 ERR("Creating session for app pid %d", app->pid);
915d047c
DG
896 /* This means that the tracer is gone... */
897 ua_sess = (void*) -1UL;
421cb601
DG
898 goto error;
899 }
900
421cb601
DG
901 ua_sess->handle = ret;
902
903 /* Add ust app session to app's HT */
2c348c10 904 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
bec39940 905 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
421cb601
DG
906
907 DBG2("UST app session created successfully with handle %d", ret);
908 }
909
fc34caaa 910end:
421cb601
DG
911 return ua_sess;
912
913error:
fc34caaa 914 delete_ust_app_session(-1, ua_sess);
421cb601
DG
915 return NULL;
916}
917
55cc08a6
DG
918/*
919 * Create a context for the channel on the tracer.
920 */
921static
922int create_ust_app_channel_context(struct ust_app_session *ua_sess,
923 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
924 struct ust_app *app)
925{
926 int ret = 0;
bec39940
DG
927 struct lttng_ht_iter iter;
928 struct lttng_ht_node_ulong *node;
55cc08a6
DG
929 struct ust_app_ctx *ua_ctx;
930
931 DBG2("UST app adding context to channel %s", ua_chan->name);
932
bec39940
DG
933 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
934 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
935 if (node != NULL) {
936 ret = -EEXIST;
937 goto error;
938 }
939
940 ua_ctx = alloc_ust_app_ctx(uctx);
941 if (ua_ctx == NULL) {
942 /* malloc failed */
943 ret = -1;
944 goto error;
945 }
946
bec39940
DG
947 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
948 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6
DG
949
950 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
951 if (ret < 0) {
952 goto error;
953 }
954
955error:
956 return ret;
957}
958
959/*
960 * Create an UST context and enable it for the event on the tracer.
961 */
962static
963int create_ust_app_event_context(struct ust_app_session *ua_sess,
964 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
965 struct ust_app *app)
966{
967 int ret = 0;
bec39940
DG
968 struct lttng_ht_iter iter;
969 struct lttng_ht_node_ulong *node;
55cc08a6
DG
970 struct ust_app_ctx *ua_ctx;
971
972 DBG2("UST app adding context to event %s", ua_event->name);
973
bec39940
DG
974 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
975 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
976 if (node != NULL) {
977 ret = -EEXIST;
978 goto error;
979 }
980
981 ua_ctx = alloc_ust_app_ctx(uctx);
982 if (ua_ctx == NULL) {
983 /* malloc failed */
984 ret = -1;
985 goto error;
986 }
987
bec39940
DG
988 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
989 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6
DG
990
991 ret = create_ust_event_context(ua_event, ua_ctx, app);
992 if (ret < 0) {
993 goto error;
994 }
995
996error:
997 return ret;
998}
999
edb67388
DG
1000/*
1001 * Enable on the tracer side a ust app event for the session and channel.
1002 */
1003static
1004int enable_ust_app_event(struct ust_app_session *ua_sess,
35a9059d 1005 struct ust_app_event *ua_event, struct ust_app *app)
edb67388
DG
1006{
1007 int ret;
1008
1009 ret = enable_ust_event(app, ua_sess, ua_event);
1010 if (ret < 0) {
1011 goto error;
1012 }
1013
1014 ua_event->enabled = 1;
1015
1016error:
1017 return ret;
1018}
1019
9730260e
DG
1020/*
1021 * Disable on the tracer side a ust app event for the session and channel.
1022 */
1023static int disable_ust_app_event(struct ust_app_session *ua_sess,
7f79d3a1 1024 struct ust_app_event *ua_event, struct ust_app *app)
9730260e
DG
1025{
1026 int ret;
1027
1028 ret = disable_ust_event(app, ua_sess, ua_event);
1029 if (ret < 0) {
1030 goto error;
1031 }
1032
1033 ua_event->enabled = 0;
1034
1035error:
1036 return ret;
1037}
1038
78f0bacd
DG
1039/*
1040 * Lookup ust app channel for session and disable it on the tracer side.
1041 */
8535a6d9
DG
1042static
1043int disable_ust_app_channel(struct ust_app_session *ua_sess,
1044 struct ust_app_channel *ua_chan, struct ust_app *app)
78f0bacd 1045{
8535a6d9 1046 int ret;
78f0bacd
DG
1047
1048 ret = disable_ust_channel(app, ua_sess, ua_chan);
1049 if (ret < 0) {
1050 goto error;
1051 }
1052
8535a6d9
DG
1053 ua_chan->enabled = 0;
1054
78f0bacd
DG
1055error:
1056 return ret;
1057}
1058
1059/*
1060 * Lookup ust app channel for session and enable it on the tracer side.
1061 */
1062static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1063 struct ltt_ust_channel *uchan, struct ust_app *app)
1064{
1065 int ret = 0;
bec39940
DG
1066 struct lttng_ht_iter iter;
1067 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1068 struct ust_app_channel *ua_chan;
1069
bec39940
DG
1070 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1071 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
78f0bacd 1072 if (ua_chan_node == NULL) {
a991f516
MD
1073 DBG2("Unable to find channel %s in ust session id %u",
1074 uchan->name, ua_sess->id);
78f0bacd
DG
1075 goto error;
1076 }
1077
1078 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1079
1080 ret = enable_ust_channel(app, ua_sess, ua_chan);
1081 if (ret < 0) {
1082 goto error;
1083 }
1084
1085error:
1086 return ret;
1087}
1088
284d8f55 1089/*
5b4a0ec0 1090 * Create UST app channel and create it on the tracer.
284d8f55 1091 */
5b4a0ec0
DG
1092static struct ust_app_channel *create_ust_app_channel(
1093 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1094 struct ust_app *app)
1095{
1096 int ret = 0;
bec39940
DG
1097 struct lttng_ht_iter iter;
1098 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
1099 struct ust_app_channel *ua_chan;
1100
1101 /* Lookup channel in the ust app session */
bec39940
DG
1102 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1103 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 1104 if (ua_chan_node != NULL) {
5b4a0ec0 1105 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 1106 goto end;
5b4a0ec0
DG
1107 }
1108
fc34caaa
DG
1109 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1110 if (ua_chan == NULL) {
1111 /* Only malloc can fail here */
1112 goto error;
1113 }
1114 shadow_copy_channel(ua_chan, uchan);
1115
5b4a0ec0
DG
1116 ret = create_ust_channel(app, ua_sess, ua_chan);
1117 if (ret < 0) {
fc34caaa
DG
1118 /* Not found previously means that it does not exist on the tracer */
1119 assert(ret != -EEXIST);
5b4a0ec0
DG
1120 goto error;
1121 }
1122
58f3ca76
DG
1123 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1124
fc34caaa 1125 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 1126 app->pid);
fc34caaa
DG
1127
1128end:
5b4a0ec0
DG
1129 return ua_chan;
1130
1131error:
fc34caaa 1132 delete_ust_app_channel(-1, ua_chan);
5b4a0ec0
DG
1133 return NULL;
1134}
1135
1136/*
1137 * Create UST app event and create it on the tracer side.
1138 */
edb67388
DG
1139static
1140int create_ust_app_event(struct ust_app_session *ua_sess,
1141 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1142 struct ust_app *app)
284d8f55 1143{
edb67388 1144 int ret = 0;
bec39940
DG
1145 struct lttng_ht_iter iter;
1146 struct lttng_ht_node_str *ua_event_node;
5b4a0ec0 1147 struct ust_app_event *ua_event;
284d8f55 1148
5b4a0ec0 1149 /* Get event node */
bec39940
DG
1150 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1151 ua_event_node = lttng_ht_iter_get_node_str(&iter);
edb67388 1152 if (ua_event_node != NULL) {
fc34caaa 1153 ret = -EEXIST;
edb67388
DG
1154 goto end;
1155 }
5b4a0ec0 1156
edb67388
DG
1157 /* Does not exist so create one */
1158 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1159 if (ua_event == NULL) {
1160 /* Only malloc can failed so something is really wrong */
1161 ret = -ENOMEM;
fc34caaa 1162 goto end;
5b4a0ec0 1163 }
edb67388 1164 shadow_copy_event(ua_event, uevent);
5b4a0ec0 1165
edb67388 1166 /* Create it on the tracer side */
5b4a0ec0 1167 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 1168 if (ret < 0) {
fc34caaa
DG
1169 /* Not found previously means that it does not exist on the tracer */
1170 assert(ret != -EEXIST);
284d8f55
DG
1171 goto error;
1172 }
1173
bec39940 1174 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
284d8f55 1175
fc34caaa 1176 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 1177 app->pid);
7f79d3a1 1178
edb67388 1179end:
fc34caaa
DG
1180 return ret;
1181
5b4a0ec0 1182error:
fc34caaa
DG
1183 /* Valid. Calling here is already in a read side lock */
1184 delete_ust_app_event(-1, ua_event);
edb67388 1185 return ret;
5b4a0ec0
DG
1186}
1187
1188/*
1189 * Create UST metadata and open it on the tracer side.
1190 */
1191static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1192 char *pathname, struct ust_app *app)
1193{
1194 int ret = 0;
1195
1196 if (ua_sess->metadata == NULL) {
1197 /* Allocate UST metadata */
1198 ua_sess->metadata = trace_ust_create_metadata(pathname);
1199 if (ua_sess->metadata == NULL) {
fc34caaa 1200 /* malloc() failed */
5b4a0ec0
DG
1201 goto error;
1202 }
1203
1204 ret = open_ust_metadata(app, ua_sess);
1205 if (ret < 0) {
7db205b5
DG
1206 DBG3("Opening metadata failed. Cleaning up memory");
1207
fc34caaa
DG
1208 /* Cleanup failed metadata struct */
1209 free(ua_sess->metadata);
7db205b5
DG
1210 /*
1211 * This is very important because delete_ust_app_session check if
1212 * the pointer is null or not in order to delete the metadata.
1213 */
1214 ua_sess->metadata = NULL;
5b4a0ec0
DG
1215 goto error;
1216 }
1217
852d0037 1218 DBG2("UST metadata opened for app pid %d", app->pid);
5b4a0ec0
DG
1219 }
1220
1221 /* Open UST metadata stream */
1222 if (ua_sess->metadata->stream_obj == NULL) {
1223 ret = create_ust_stream(app, ua_sess);
1224 if (ret < 0) {
1225 goto error;
1226 }
1227
e11d277b 1228 ret = run_as_mkdir(ua_sess->path, S_IRWXU | S_IRWXG,
67f747d8 1229 ua_sess->uid, ua_sess->gid);
5b4a0ec0
DG
1230 if (ret < 0) {
1231 PERROR("mkdir UST metadata");
1232 goto error;
1233 }
1234
477d7741
MD
1235 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1236 "%s/metadata", ua_sess->path);
5b4a0ec0
DG
1237 if (ret < 0) {
1238 PERROR("asprintf UST create stream");
1239 goto error;
1240 }
1241
1242 DBG2("UST metadata stream object created for app pid %d",
852d0037 1243 app->pid);
5b4a0ec0
DG
1244 } else {
1245 ERR("Attempting to create stream without metadata opened");
1246 goto error;
1247 }
1248
1249 return 0;
1250
1251error:
1252 return -1;
1253}
1254
1255/*
1256 * Return pointer to traceable apps list.
1257 */
bec39940 1258struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
1259{
1260 return ust_app_ht;
1261}
1262
1263/*
1264 * Return ust app pointer or NULL if not found.
1265 */
1266struct ust_app *ust_app_find_by_pid(pid_t pid)
1267{
bec39940
DG
1268 struct lttng_ht_node_ulong *node;
1269 struct lttng_ht_iter iter;
5b4a0ec0
DG
1270
1271 rcu_read_lock();
bec39940
DG
1272 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1273 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
1274 if (node == NULL) {
1275 DBG2("UST app no found with pid %d", pid);
1276 goto error;
1277 }
1278 rcu_read_unlock();
1279
1280 DBG2("Found UST app by pid %d", pid);
1281
852d0037 1282 return caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
1283
1284error:
1285 rcu_read_unlock();
1286 return NULL;
1287}
1288
1289/*
1290 * Using pid and uid (of the app), allocate a new ust_app struct and
1291 * add it to the global traceable app list.
1292 *
0df502fd
MD
1293 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1294 * bitness is not supported.
5b4a0ec0
DG
1295 */
1296int ust_app_register(struct ust_register_msg *msg, int sock)
1297{
1298 struct ust_app *lta;
799e2c4f 1299 int ret;
5b4a0ec0 1300
7753dea8
MD
1301 if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
1302 || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
f943b0fb 1303 ERR("Registration failed: application \"%s\" (pid: %d) has "
7753dea8
MD
1304 "%d-bit long, but no consumerd for this long size is available.\n",
1305 msg->name, msg->pid, msg->bits_per_long);
799e2c4f
MD
1306 ret = close(sock);
1307 if (ret) {
1308 PERROR("close");
1309 }
4063050c 1310 lttng_fd_put(LTTNG_FD_APPS, 1);
0df502fd
MD
1311 return -EINVAL;
1312 }
3f2c5fcc
MD
1313 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1314 ERR("Registration failed: application \"%s\" (pid: %d) has "
1315 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1316 msg->name, msg->pid, msg->major, msg->minor);
799e2c4f
MD
1317 ret = close(sock);
1318 if (ret) {
1319 PERROR("close");
1320 }
4063050c 1321 lttng_fd_put(LTTNG_FD_APPS, 1);
3f2c5fcc
MD
1322 return -EINVAL;
1323 }
5b4a0ec0
DG
1324 lta = zmalloc(sizeof(struct ust_app));
1325 if (lta == NULL) {
1326 PERROR("malloc");
1327 return -ENOMEM;
1328 }
1329
1330 lta->ppid = msg->ppid;
1331 lta->uid = msg->uid;
1332 lta->gid = msg->gid;
e0c7ec2b 1333 lta->compatible = 0; /* Not compatible until proven */
7753dea8 1334 lta->bits_per_long = msg->bits_per_long;
5b4a0ec0
DG
1335 lta->v_major = msg->major;
1336 lta->v_minor = msg->minor;
1337 strncpy(lta->name, msg->name, sizeof(lta->name));
1338 lta->name[16] = '\0';
bec39940 1339 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
5b4a0ec0 1340
852d0037
DG
1341 lta->pid = msg->pid;
1342 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1343 lta->sock = sock;
1344 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
5b4a0ec0
DG
1345
1346 rcu_read_lock();
852d0037
DG
1347
1348 /*
1349 * On a re-registration, we want to kick out the previous registration of
1350 * that pid
1351 */
1352 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1353
1354 /*
1355 * The socket _should_ be unique until _we_ call close. So, a add_unique
1356 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1357 * already in the table.
1358 */
1359 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1360
5b4a0ec0
DG
1361 rcu_read_unlock();
1362
1363 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
852d0037
DG
1364 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1365 lta->sock, lta->name, lta->v_major, lta->v_minor);
5b4a0ec0
DG
1366
1367 return 0;
1368}
1369
1370/*
1371 * Unregister app by removing it from the global traceable app list and freeing
1372 * the data struct.
1373 *
1374 * The socket is already closed at this point so no close to sock.
1375 */
1376void ust_app_unregister(int sock)
1377{
1378 struct ust_app *lta;
bec39940
DG
1379 struct lttng_ht_node_ulong *node;
1380 struct lttng_ht_iter iter;
525b0740 1381 int ret;
5b4a0ec0
DG
1382
1383 rcu_read_lock();
886459c6 1384
5b4a0ec0 1385 /* Get the node reference for a call_rcu */
852d0037 1386 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1387 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0 1388 if (node == NULL) {
852d0037 1389 ERR("Unable to find app by sock %d", sock);
5b4a0ec0
DG
1390 goto error;
1391 }
284d8f55 1392
852d0037
DG
1393 lta = caa_container_of(node, struct ust_app, sock_n);
1394
1395 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1396
886459c6 1397 /* Remove application from PID hash table */
852d0037
DG
1398 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1399 assert(!ret);
1400
1401 /* Assign second node for deletion */
1402 iter.iter.node = &lta->pid_n.node;
1403
bec39940 1404 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1405 assert(!ret);
852d0037
DG
1406
1407 /* Free memory */
1408 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1409
284d8f55 1410error:
5b4a0ec0
DG
1411 rcu_read_unlock();
1412 return;
284d8f55
DG
1413}
1414
1415/*
5b4a0ec0 1416 * Return traceable_app_count
284d8f55 1417 */
5b4a0ec0 1418unsigned long ust_app_list_count(void)
284d8f55 1419{
5b4a0ec0 1420 unsigned long count;
284d8f55 1421
5b4a0ec0 1422 rcu_read_lock();
bec39940 1423 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 1424 rcu_read_unlock();
284d8f55 1425
5b4a0ec0 1426 return count;
284d8f55
DG
1427}
1428
5b4a0ec0
DG
1429/*
1430 * Fill events array with all events name of all registered apps.
1431 */
1432int ust_app_list_events(struct lttng_event **events)
421cb601 1433{
5b4a0ec0
DG
1434 int ret, handle;
1435 size_t nbmem, count = 0;
bec39940 1436 struct lttng_ht_iter iter;
5b4a0ec0
DG
1437 struct ust_app *app;
1438 struct lttng_event *tmp;
421cb601 1439
5b4a0ec0
DG
1440 nbmem = UST_APP_EVENT_LIST_SIZE;
1441 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1442 if (tmp == NULL) {
1443 PERROR("zmalloc ust app events");
1444 ret = -ENOMEM;
421cb601
DG
1445 goto error;
1446 }
1447
5b4a0ec0 1448 rcu_read_lock();
421cb601 1449
852d0037 1450 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 1451 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 1452
e0c7ec2b
DG
1453 if (!app->compatible) {
1454 /*
1455 * TODO: In time, we should notice the caller of this error by
1456 * telling him that this is a version error.
1457 */
1458 continue;
1459 }
852d0037 1460 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0
DG
1461 if (handle < 0) {
1462 ERR("UST app list events getting handle failed for app pid %d",
852d0037 1463 app->pid);
5b4a0ec0
DG
1464 continue;
1465 }
421cb601 1466
852d0037 1467 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
90eaa0d2 1468 &uiter)) != -ENOENT) {
815564d8
MD
1469 if (count >= nbmem) {
1470 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1471 2 * nbmem);
1472 nbmem *= 2;
2f221590 1473 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
5b4a0ec0
DG
1474 if (tmp == NULL) {
1475 PERROR("realloc ust app events");
1476 ret = -ENOMEM;
1477 goto rcu_error;
1478 }
1479 }
90eaa0d2 1480 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
8005f29a 1481 tmp[count].loglevel = uiter.loglevel;
6775595e 1482 tmp[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
852d0037 1483 tmp[count].pid = app->pid;
5b4a0ec0
DG
1484 tmp[count].enabled = -1;
1485 count++;
421cb601 1486 }
421cb601
DG
1487 }
1488
5b4a0ec0
DG
1489 ret = count;
1490 *events = tmp;
421cb601 1491
5b4a0ec0 1492 DBG2("UST app list events done (%zu events)", count);
421cb601 1493
5b4a0ec0
DG
1494rcu_error:
1495 rcu_read_unlock();
421cb601 1496error:
5b4a0ec0 1497 return ret;
421cb601
DG
1498}
1499
5b4a0ec0
DG
1500/*
1501 * Free and clean all traceable apps of the global list.
1502 */
1503void ust_app_clean_list(void)
421cb601 1504{
5b4a0ec0 1505 int ret;
bec39940
DG
1506 struct lttng_ht_iter iter;
1507 struct lttng_ht_node_ulong *node;
421cb601 1508
5b4a0ec0 1509 DBG2("UST app cleaning registered apps hash table");
421cb601 1510
5b4a0ec0 1511 rcu_read_lock();
421cb601 1512
bec39940
DG
1513 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
1514 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1515 assert(!ret);
bec39940 1516 call_rcu(&node->head, delete_ust_app_rcu);
421cb601
DG
1517 }
1518
852d0037
DG
1519 /* Cleanup socket hash table */
1520 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, node, node) {
1521 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
bec39940
DG
1522 assert(!ret);
1523 }
852d0037 1524
bec39940 1525 /* Destroy is done only when the ht is empty */
852d0037
DG
1526 lttng_ht_destroy(ust_app_ht);
1527 lttng_ht_destroy(ust_app_ht_by_sock);
421cb601 1528
5b4a0ec0
DG
1529 rcu_read_unlock();
1530}
1531
1532/*
1533 * Init UST app hash table.
1534 */
1535void ust_app_ht_alloc(void)
1536{
bec39940 1537 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
852d0037 1538 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
1539}
1540
78f0bacd
DG
1541/*
1542 * For a specific UST session, disable the channel for all registered apps.
1543 */
35a9059d 1544int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1545 struct ltt_ust_channel *uchan)
1546{
1547 int ret = 0;
bec39940
DG
1548 struct lttng_ht_iter iter;
1549 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1550 struct ust_app *app;
1551 struct ust_app_session *ua_sess;
8535a6d9 1552 struct ust_app_channel *ua_chan;
78f0bacd
DG
1553
1554 if (usess == NULL || uchan == NULL) {
1555 ERR("Disabling UST global channel with NULL values");
1556 ret = -1;
1557 goto error;
1558 }
1559
a991f516
MD
1560 DBG2("UST app disabling channel %s from global domain for session id %d",
1561 uchan->name, usess->id);
78f0bacd
DG
1562
1563 rcu_read_lock();
1564
1565 /* For every registered applications */
852d0037 1566 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1567 struct lttng_ht_iter uiter;
e0c7ec2b
DG
1568 if (!app->compatible) {
1569 /*
1570 * TODO: In time, we should notice the caller of this error by
1571 * telling him that this is a version error.
1572 */
1573 continue;
1574 }
78f0bacd
DG
1575 ua_sess = lookup_session_by_app(usess, app);
1576 if (ua_sess == NULL) {
1577 continue;
1578 }
1579
8535a6d9 1580 /* Get channel */
bec39940
DG
1581 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1582 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
1583 /* If the session if found for the app, the channel must be there */
1584 assert(ua_chan_node);
1585
1586 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1587 /* The channel must not be already disabled */
1588 assert(ua_chan->enabled == 1);
1589
1590 /* Disable channel onto application */
1591 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
1592 if (ret < 0) {
1593 /* XXX: We might want to report this error at some point... */
1594 continue;
1595 }
1596 }
1597
1598 rcu_read_unlock();
1599
1600error:
1601 return ret;
1602}
1603
1604/*
1605 * For a specific UST session, enable the channel for all registered apps.
1606 */
35a9059d 1607int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1608 struct ltt_ust_channel *uchan)
1609{
1610 int ret = 0;
bec39940 1611 struct lttng_ht_iter iter;
78f0bacd
DG
1612 struct ust_app *app;
1613 struct ust_app_session *ua_sess;
1614
1615 if (usess == NULL || uchan == NULL) {
1616 ERR("Adding UST global channel to NULL values");
1617 ret = -1;
1618 goto error;
1619 }
1620
a991f516
MD
1621 DBG2("UST app enabling channel %s to global domain for session id %d",
1622 uchan->name, usess->id);
78f0bacd
DG
1623
1624 rcu_read_lock();
1625
1626 /* For every registered applications */
852d0037 1627 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1628 if (!app->compatible) {
1629 /*
1630 * TODO: In time, we should notice the caller of this error by
1631 * telling him that this is a version error.
1632 */
1633 continue;
1634 }
78f0bacd
DG
1635 ua_sess = lookup_session_by_app(usess, app);
1636 if (ua_sess == NULL) {
1637 continue;
1638 }
1639
1640 /* Enable channel onto application */
1641 ret = enable_ust_app_channel(ua_sess, uchan, app);
1642 if (ret < 0) {
1643 /* XXX: We might want to report this error at some point... */
1644 continue;
1645 }
1646 }
1647
1648 rcu_read_unlock();
1649
1650error:
1651 return ret;
1652}
1653
b0a40d28
DG
1654/*
1655 * Disable an event in a channel and for a specific session.
1656 */
35a9059d
DG
1657int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1658 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
1659{
1660 int ret = 0;
bec39940
DG
1661 struct lttng_ht_iter iter, uiter;
1662 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
b0a40d28
DG
1663 struct ust_app *app;
1664 struct ust_app_session *ua_sess;
1665 struct ust_app_channel *ua_chan;
1666 struct ust_app_event *ua_event;
1667
1668 DBG("UST app disabling event %s for all apps in channel "
a991f516 1669 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
1670
1671 rcu_read_lock();
1672
1673 /* For all registered applications */
852d0037 1674 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1675 if (!app->compatible) {
1676 /*
1677 * TODO: In time, we should notice the caller of this error by
1678 * telling him that this is a version error.
1679 */
1680 continue;
1681 }
b0a40d28
DG
1682 ua_sess = lookup_session_by_app(usess, app);
1683 if (ua_sess == NULL) {
1684 /* Next app */
1685 continue;
1686 }
1687
1688 /* Lookup channel in the ust app session */
bec39940
DG
1689 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1690 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 1691 if (ua_chan_node == NULL) {
a991f516 1692 DBG2("Channel %s not found in session id %d for app pid %d."
852d0037 1693 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
1694 continue;
1695 }
1696 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1697
bec39940
DG
1698 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1699 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28
DG
1700 if (ua_event_node == NULL) {
1701 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 1702 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
1703 continue;
1704 }
1705 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1706
7f79d3a1 1707 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
1708 if (ret < 0) {
1709 /* XXX: Report error someday... */
1710 continue;
1711 }
1712 }
1713
1714 rcu_read_unlock();
1715
1716 return ret;
1717}
1718
9730260e 1719/*
edb67388 1720 * For a specific UST session and UST channel, the event for all
9730260e
DG
1721 * registered apps.
1722 */
35a9059d 1723int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
9730260e
DG
1724 struct ltt_ust_channel *uchan)
1725{
1726 int ret = 0;
bec39940
DG
1727 struct lttng_ht_iter iter, uiter;
1728 struct lttng_ht_node_str *ua_chan_node;
9730260e
DG
1729 struct ust_app *app;
1730 struct ust_app_session *ua_sess;
1731 struct ust_app_channel *ua_chan;
1732 struct ust_app_event *ua_event;
1733
1734 DBG("UST app disabling all event for all apps in channel "
a991f516 1735 "%s for session id %d", uchan->name, usess->id);
9730260e
DG
1736
1737 rcu_read_lock();
1738
1739 /* For all registered applications */
852d0037 1740 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1741 if (!app->compatible) {
1742 /*
1743 * TODO: In time, we should notice the caller of this error by
1744 * telling him that this is a version error.
1745 */
1746 continue;
1747 }
9730260e 1748 ua_sess = lookup_session_by_app(usess, app);
edb67388
DG
1749 /* If ua_sess is NULL, there is a code flow error */
1750 assert(ua_sess);
9730260e
DG
1751
1752 /* Lookup channel in the ust app session */
bec39940
DG
1753 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1754 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1755 /* If the channel is not found, there is a code flow error */
1756 assert(ua_chan_node);
1757
9730260e
DG
1758 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1759
1760 /* Disable each events of channel */
bec39940
DG
1761 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1762 node.node) {
7f79d3a1 1763 ret = disable_ust_app_event(ua_sess, ua_event, app);
9730260e
DG
1764 if (ret < 0) {
1765 /* XXX: Report error someday... */
1766 continue;
1767 }
1768 }
1769 }
1770
1771 rcu_read_unlock();
1772
1773 return ret;
1774}
1775
421cb601 1776/*
5b4a0ec0 1777 * For a specific UST session, create the channel for all registered apps.
421cb601 1778 */
35a9059d 1779int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
1780 struct ltt_ust_channel *uchan)
1781{
bec39940 1782 struct lttng_ht_iter iter;
48842b30
DG
1783 struct ust_app *app;
1784 struct ust_app_session *ua_sess;
1785 struct ust_app_channel *ua_chan;
1786
fc34caaa
DG
1787 /* Very wrong code flow */
1788 assert(usess);
1789 assert(uchan);
421cb601 1790
a991f516
MD
1791 DBG2("UST app adding channel %s to global domain for session id %d",
1792 uchan->name, usess->id);
48842b30
DG
1793
1794 rcu_read_lock();
421cb601 1795
5b4a0ec0 1796 /* For every registered applications */
852d0037 1797 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1798 if (!app->compatible) {
1799 /*
1800 * TODO: In time, we should notice the caller of this error by
1801 * telling him that this is a version error.
1802 */
1803 continue;
1804 }
edb67388
DG
1805 /*
1806 * Create session on the tracer side and add it to app session HT. Note
1807 * that if session exist, it will simply return a pointer to the ust
1808 * app session.
1809 */
421cb601 1810 ua_sess = create_ust_app_session(usess, app);
509cbaf8 1811 if (ua_sess == NULL) {
915d047c 1812 /* The malloc() failed. */
fc34caaa 1813 goto error;
915d047c
DG
1814 } else if (ua_sess == (void *) -1UL) {
1815 /* The application's socket is not valid. Contiuing */
1816 continue;
48842b30
DG
1817 }
1818
421cb601
DG
1819 /* Create channel onto application */
1820 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
1821 if (ua_chan == NULL) {
fc34caaa
DG
1822 /* Major problem here and it's maybe the tracer or malloc() */
1823 goto error;
48842b30 1824 }
48842b30 1825 }
5b4a0ec0 1826
48842b30
DG
1827 rcu_read_unlock();
1828
fc34caaa
DG
1829 return 0;
1830
421cb601 1831error:
fc34caaa 1832 return -1;
48842b30
DG
1833}
1834
5b4a0ec0 1835/*
edb67388 1836 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 1837 */
35a9059d 1838int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
1839 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1840{
1841 int ret = 0;
bec39940
DG
1842 struct lttng_ht_iter iter, uiter;
1843 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
48842b30
DG
1844 struct ust_app *app;
1845 struct ust_app_session *ua_sess;
1846 struct ust_app_channel *ua_chan;
1847 struct ust_app_event *ua_event;
48842b30 1848
a991f516
MD
1849 DBG("UST app enabling event %s for all apps for session id %d",
1850 uevent->attr.name, usess->id);
48842b30 1851
edb67388
DG
1852 /*
1853 * NOTE: At this point, this function is called only if the session and
1854 * channel passed are already created for all apps. and enabled on the
1855 * tracer also.
1856 */
1857
48842b30 1858 rcu_read_lock();
421cb601
DG
1859
1860 /* For all registered applications */
852d0037 1861 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1862 if (!app->compatible) {
1863 /*
1864 * TODO: In time, we should notice the caller of this error by
1865 * telling him that this is a version error.
1866 */
1867 continue;
1868 }
edb67388
DG
1869 ua_sess = lookup_session_by_app(usess, app);
1870 /* If ua_sess is NULL, there is a code flow error */
1871 assert(ua_sess);
ba767faf 1872
edb67388 1873 /* Lookup channel in the ust app session */
bec39940
DG
1874 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1875 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1876 /* If the channel is not found, there is a code flow error */
1877 assert(ua_chan_node);
1878
1879 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1880
bec39940
DG
1881 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
1882 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
35a9059d 1883 if (ua_event_node == NULL) {
7f79d3a1 1884 DBG3("UST app enable event %s not found for app PID %d."
852d0037 1885 "Skipping app", uevent->attr.name, app->pid);
35a9059d
DG
1886 continue;
1887 }
1888 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1889
1890 ret = enable_ust_app_event(ua_sess, ua_event, app);
1891 if (ret < 0) {
7f79d3a1 1892 goto error;
48842b30 1893 }
edb67388
DG
1894 }
1895
7f79d3a1 1896error:
edb67388 1897 rcu_read_unlock();
edb67388
DG
1898 return ret;
1899}
1900
1901/*
1902 * For a specific existing UST session and UST channel, creates the event for
1903 * all registered apps.
1904 */
35a9059d 1905int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
1906 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1907{
1908 int ret = 0;
bec39940
DG
1909 struct lttng_ht_iter iter, uiter;
1910 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
1911 struct ust_app *app;
1912 struct ust_app_session *ua_sess;
1913 struct ust_app_channel *ua_chan;
1914
a991f516
MD
1915 DBG("UST app creating event %s for all apps for session id %d",
1916 uevent->attr.name, usess->id);
edb67388 1917
edb67388
DG
1918 rcu_read_lock();
1919
1920 /* For all registered applications */
852d0037 1921 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1922 if (!app->compatible) {
1923 /*
1924 * TODO: In time, we should notice the caller of this error by
1925 * telling him that this is a version error.
1926 */
1927 continue;
1928 }
edb67388
DG
1929 ua_sess = lookup_session_by_app(usess, app);
1930 /* If ua_sess is NULL, there is a code flow error */
1931 assert(ua_sess);
48842b30
DG
1932
1933 /* Lookup channel in the ust app session */
bec39940
DG
1934 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1935 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1936 /* If the channel is not found, there is a code flow error */
1937 assert(ua_chan_node);
1938
48842b30
DG
1939 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1940
edb67388
DG
1941 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
1942 if (ret < 0) {
fc34caaa
DG
1943 if (ret != -EEXIST) {
1944 /* Possible value at this point: -ENOMEM. If so, we stop! */
1945 break;
1946 }
1947 DBG2("UST app event %s already exist on app PID %d",
852d0037 1948 uevent->attr.name, app->pid);
5b4a0ec0 1949 continue;
48842b30 1950 }
48842b30 1951 }
5b4a0ec0 1952
48842b30
DG
1953 rcu_read_unlock();
1954
1955 return ret;
1956}
1957
5b4a0ec0
DG
1958/*
1959 * Start tracing for a specific UST session and app.
1960 */
421cb601 1961int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
1962{
1963 int ret = 0;
bec39940 1964 struct lttng_ht_iter iter;
48842b30
DG
1965 struct ust_app_session *ua_sess;
1966 struct ust_app_channel *ua_chan;
5b4a0ec0 1967 struct ltt_ust_stream *ustream;
7753dea8 1968 int consumerd_fd;
48842b30 1969
852d0037 1970 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 1971
509cbaf8
MD
1972 rcu_read_lock();
1973
e0c7ec2b
DG
1974 if (!app->compatible) {
1975 goto end;
1976 }
1977
421cb601
DG
1978 ua_sess = lookup_session_by_app(usess, app);
1979 if (ua_sess == NULL) {
509cbaf8 1980 goto error_rcu_unlock;
421cb601 1981 }
48842b30 1982
aea829b3
DG
1983 /* Upon restart, we skip the setup, already done */
1984 if (ua_sess->started) {
8be98f9a 1985 goto skip_setup;
aea829b3 1986 }
8be98f9a 1987
f848c3eb
DG
1988 /* Indicate that the session has been started once */
1989 ua_sess->started = 1;
1990
421cb601
DG
1991 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
1992 if (ret < 0) {
509cbaf8 1993 goto error_rcu_unlock;
421cb601 1994 }
48842b30 1995
421cb601 1996 /* For each channel */
bec39940
DG
1997 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
1998 node.node) {
421cb601
DG
1999 /* Create all streams */
2000 while (1) {
5b4a0ec0 2001 /* Create UST stream */
421cb601
DG
2002 ustream = zmalloc(sizeof(*ustream));
2003 if (ustream == NULL) {
2004 PERROR("zmalloc ust stream");
509cbaf8 2005 goto error_rcu_unlock;
421cb601 2006 }
48842b30 2007
4063050c
MD
2008 /* We are going to receive 2 fds, we need to reserve them. */
2009 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2010 if (ret < 0) {
2011 ERR("Exhausted number of available FD upon stream create");
2012 free(ustream);
2013 goto error_rcu_unlock;
2014 }
852d0037 2015 ret = ustctl_create_stream(app->sock, ua_chan->obj,
421cb601 2016 &ustream->obj);
48842b30 2017 if (ret < 0) {
421cb601 2018 /* Got all streams */
4063050c 2019 lttng_fd_put(LTTNG_FD_APPS, 2);
a2c0da86 2020 free(ustream);
421cb601 2021 break;
48842b30 2022 }
421cb601 2023 ustream->handle = ustream->obj->handle;
48842b30 2024
421cb601
DG
2025 /* Order is important */
2026 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
477d7741
MD
2027 ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
2028 ua_sess->path, ua_chan->name,
2029 ua_chan->streams.count++);
aba8e916
DG
2030 if (ret < 0) {
2031 PERROR("asprintf UST create stream");
a2c0da86
MD
2032 /*
2033 * XXX what should we do here with the
2034 * stream ?
2035 */
421cb601 2036 continue;
aba8e916 2037 }
421cb601
DG
2038 DBG2("UST stream %d ready at %s", ua_chan->streams.count,
2039 ustream->pathname);
2040 }
421cb601 2041 }
aba8e916 2042
7753dea8
MD
2043 switch (app->bits_per_long) {
2044 case 64:
2045 consumerd_fd = ust_consumerd64_fd;
2046 break;
2047 case 32:
2048 consumerd_fd = ust_consumerd32_fd;
2049 break;
2050 default:
2051 ret = -EINVAL;
2052 goto error_rcu_unlock;
2053 }
aea829b3 2054
421cb601 2055 /* Setup UST consumer socket and send fds to it */
7753dea8 2056 ret = ust_consumer_send_session(consumerd_fd, ua_sess);
421cb601 2057 if (ret < 0) {
509cbaf8 2058 goto error_rcu_unlock;
421cb601 2059 }
48842b30 2060
8be98f9a 2061skip_setup:
421cb601 2062 /* This start the UST tracing */
852d0037 2063 ret = ustctl_start_session(app->sock, ua_sess->handle);
421cb601 2064 if (ret < 0) {
852d0037 2065 ERR("Error starting tracing for app pid: %d", app->pid);
509cbaf8 2066 goto error_rcu_unlock;
421cb601 2067 }
5b4a0ec0 2068
421cb601 2069 /* Quiescent wait after starting trace */
852d0037 2070 ustctl_wait_quiescent(app->sock);
48842b30 2071
e0c7ec2b
DG
2072end:
2073 rcu_read_unlock();
421cb601 2074 return 0;
48842b30 2075
509cbaf8
MD
2076error_rcu_unlock:
2077 rcu_read_unlock();
421cb601
DG
2078 return -1;
2079}
48842b30 2080
8be98f9a
MD
2081/*
2082 * Stop tracing for a specific UST session and app.
2083 */
2084int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2085{
2086 int ret = 0;
bec39940 2087 struct lttng_ht_iter iter;
8be98f9a 2088 struct ust_app_session *ua_sess;
6d3686da 2089 struct ust_app_channel *ua_chan;
8be98f9a 2090
852d0037 2091 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
2092
2093 rcu_read_lock();
2094
e0c7ec2b
DG
2095 if (!app->compatible) {
2096 goto end;
2097 }
2098
8be98f9a
MD
2099 ua_sess = lookup_session_by_app(usess, app);
2100 if (ua_sess == NULL) {
2101 /* Only malloc can failed so something is really wrong */
2102 goto error_rcu_unlock;
2103 }
2104
9bc07046
DG
2105 /*
2106 * If started = 0, it means that stop trace has been called for a session
2107 * that was never started. This is a code flow error and should never
2108 * happen.
2109 */
2110 assert(ua_sess->started == 1);
7db205b5 2111
9d6c7d3f 2112 /* This inhibits UST tracing */
852d0037 2113 ret = ustctl_stop_session(app->sock, ua_sess->handle);
9d6c7d3f 2114 if (ret < 0) {
852d0037 2115 ERR("Error stopping tracing for app pid: %d", app->pid);
9d6c7d3f
DG
2116 goto error_rcu_unlock;
2117 }
2118
2119 /* Quiescent wait after stopping trace */
852d0037 2120 ustctl_wait_quiescent(app->sock);
9d6c7d3f
DG
2121
2122 /* Flushing buffers */
bec39940
DG
2123 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2124 node.node) {
852d0037 2125 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
8be98f9a 2126 if (ret < 0) {
7db205b5 2127 ERR("UST app PID %d channel %s flush failed with ret %d",
852d0037 2128 app->pid, ua_chan->name, ret);
6d3686da
DG
2129 /* Continuing flushing all buffers */
2130 continue;
8be98f9a
MD
2131 }
2132 }
8be98f9a 2133
90d97d10 2134 /* Flush all buffers before stopping */
852d0037 2135 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
90d97d10 2136 if (ret < 0) {
852d0037 2137 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
7db205b5 2138 ret);
90d97d10
DG
2139 }
2140
7db205b5
DG
2141end:
2142 rcu_read_unlock();
8be98f9a
MD
2143 return 0;
2144
2145error_rcu_unlock:
2146 rcu_read_unlock();
2147 return -1;
2148}
2149
84cd17c6
MD
2150/*
2151 * Destroy a specific UST session in apps.
2152 */
2153int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2154{
2155 struct ust_app_session *ua_sess;
2156 struct lttng_ust_object_data obj;
bec39940
DG
2157 struct lttng_ht_iter iter;
2158 struct lttng_ht_node_ulong *node;
525b0740 2159 int ret;
84cd17c6 2160
852d0037 2161 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
2162
2163 rcu_read_lock();
2164
e0c7ec2b
DG
2165 if (!app->compatible) {
2166 goto end;
2167 }
2168
84cd17c6 2169 __lookup_session_by_app(usess, app, &iter);
bec39940 2170 node = lttng_ht_iter_get_node_ulong(&iter);
84cd17c6
MD
2171 if (node == NULL) {
2172 /* Only malloc can failed so something is really wrong */
2173 goto error_rcu_unlock;
2174 }
2175 ua_sess = caa_container_of(node, struct ust_app_session, node);
bec39940 2176 ret = lttng_ht_del(app->sessions, &iter);
525b0740 2177 assert(!ret);
84cd17c6
MD
2178 obj.handle = ua_sess->handle;
2179 obj.shm_fd = -1;
2180 obj.wait_fd = -1;
2181 obj.memory_map_size = 0;
852d0037 2182 ustctl_release_object(app->sock, &obj);
84cd17c6 2183
852d0037 2184 delete_ust_app_session(app->sock, ua_sess);
7db205b5 2185
84cd17c6 2186 /* Quiescent wait after stopping trace */
852d0037 2187 ustctl_wait_quiescent(app->sock);
84cd17c6 2188
e0c7ec2b
DG
2189end:
2190 rcu_read_unlock();
84cd17c6
MD
2191 return 0;
2192
2193error_rcu_unlock:
2194 rcu_read_unlock();
2195 return -1;
2196}
2197
5b4a0ec0
DG
2198/*
2199 * Start tracing for the UST session.
2200 */
421cb601
DG
2201int ust_app_start_trace_all(struct ltt_ust_session *usess)
2202{
2203 int ret = 0;
bec39940 2204 struct lttng_ht_iter iter;
421cb601 2205 struct ust_app *app;
48842b30 2206
421cb601
DG
2207 DBG("Starting all UST traces");
2208
2209 rcu_read_lock();
421cb601 2210
852d0037 2211 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
421cb601 2212 ret = ust_app_start_trace(usess, app);
48842b30 2213 if (ret < 0) {
5b4a0ec0
DG
2214 /* Continue to next apps even on error */
2215 continue;
48842b30 2216 }
48842b30 2217 }
5b4a0ec0 2218
48842b30
DG
2219 rcu_read_unlock();
2220
2221 return 0;
2222}
487cf67c 2223
8be98f9a
MD
2224/*
2225 * Start tracing for the UST session.
2226 */
2227int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2228{
2229 int ret = 0;
bec39940 2230 struct lttng_ht_iter iter;
8be98f9a
MD
2231 struct ust_app *app;
2232
2233 DBG("Stopping all UST traces");
2234
2235 rcu_read_lock();
2236
852d0037 2237 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
8be98f9a
MD
2238 ret = ust_app_stop_trace(usess, app);
2239 if (ret < 0) {
2240 /* Continue to next apps even on error */
2241 continue;
2242 }
2243 }
2244
2245 rcu_read_unlock();
2246
2247 return 0;
2248}
2249
84cd17c6
MD
2250/*
2251 * Destroy app UST session.
2252 */
2253int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2254{
2255 int ret = 0;
bec39940 2256 struct lttng_ht_iter iter;
84cd17c6
MD
2257 struct ust_app *app;
2258
2259 DBG("Destroy all UST traces");
2260
2261 rcu_read_lock();
2262
852d0037 2263 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
84cd17c6
MD
2264 ret = ust_app_destroy_trace(usess, app);
2265 if (ret < 0) {
2266 /* Continue to next apps even on error */
2267 continue;
2268 }
2269 }
2270
2271 rcu_read_unlock();
2272
2273 return 0;
2274}
2275
5b4a0ec0
DG
2276/*
2277 * Add channels/events from UST global domain to registered apps at sock.
2278 */
487cf67c
DG
2279void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2280{
55c54cce 2281 int ret = 0;
727d5404 2282 struct lttng_ht_iter iter, uiter, iter_ctx;
487cf67c
DG
2283 struct ust_app *app;
2284 struct ust_app_session *ua_sess;
2285 struct ust_app_channel *ua_chan;
2286 struct ust_app_event *ua_event;
727d5404 2287 struct ust_app_ctx *ua_ctx;
1f3580c7
DG
2288
2289 if (usess == NULL) {
5b4a0ec0 2290 ERR("No UST session on global update. Returning");
1f3580c7
DG
2291 goto error;
2292 }
2293
a991f516
MD
2294 DBG2("UST app global update for app sock %d for session id %d", sock,
2295 usess->id);
487cf67c 2296
284d8f55
DG
2297 rcu_read_lock();
2298
487cf67c
DG
2299 app = find_app_by_sock(sock);
2300 if (app == NULL) {
2301 ERR("Failed to update app sock %d", sock);
2302 goto error;
2303 }
2304
e0c7ec2b
DG
2305 if (!app->compatible) {
2306 goto error;
2307 }
2308
421cb601 2309 ua_sess = create_ust_app_session(usess, app);
487cf67c 2310 if (ua_sess == NULL) {
487cf67c
DG
2311 goto error;
2312 }
2313
284d8f55
DG
2314 /*
2315 * We can iterate safely here over all UST app session sicne the create ust
2316 * app session above made a shadow copy of the UST global domain from the
2317 * ltt ust session.
2318 */
bec39940
DG
2319 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2320 node.node) {
284d8f55
DG
2321 ret = create_ust_channel(app, ua_sess, ua_chan);
2322 if (ret < 0) {
2323 /* FIXME: Should we quit here or continue... */
2324 continue;
487cf67c
DG
2325 }
2326
727d5404
DG
2327 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2328 node.node) {
2329 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2330 if (ret < 0) {
2331 /* FIXME: Should we quit here or continue... */
2332 continue;
2333 }
2334 }
2335
2336
284d8f55 2337 /* For each events */
bec39940
DG
2338 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2339 node.node) {
284d8f55
DG
2340 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2341 if (ret < 0) {
2342 /* FIXME: Should we quit here or continue... */
2343 continue;
487cf67c 2344 }
727d5404
DG
2345
2346 /* Add context on events. */
2347 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2348 ua_ctx, node.node) {
2349 ret = create_ust_event_context(ua_event, ua_ctx, app);
2350 if (ret < 0) {
2351 /* FIXME: Should we quit here or continue... */
2352 continue;
2353 }
2354 }
36dc12cc 2355 }
487cf67c
DG
2356 }
2357
36dc12cc 2358 if (usess->start_trace) {
421cb601 2359 ret = ust_app_start_trace(usess, app);
36dc12cc 2360 if (ret < 0) {
36dc12cc
DG
2361 goto error;
2362 }
2363
852d0037 2364 DBG2("UST trace started for app pid %d", app->pid);
36dc12cc
DG
2365 }
2366
487cf67c
DG
2367error:
2368 rcu_read_unlock();
2369 return;
2370}
55cc08a6
DG
2371
2372/*
2373 * Add context to a specific channel for global UST domain.
2374 */
2375int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2376 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2377{
2378 int ret = 0;
bec39940
DG
2379 struct lttng_ht_node_str *ua_chan_node;
2380 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2381 struct ust_app_channel *ua_chan = NULL;
2382 struct ust_app_session *ua_sess;
2383 struct ust_app *app;
2384
2385 rcu_read_lock();
2386
852d0037 2387 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2388 if (!app->compatible) {
2389 /*
2390 * TODO: In time, we should notice the caller of this error by
2391 * telling him that this is a version error.
2392 */
2393 continue;
2394 }
55cc08a6
DG
2395 ua_sess = lookup_session_by_app(usess, app);
2396 if (ua_sess == NULL) {
2397 continue;
2398 }
2399
2400 /* Lookup channel in the ust app session */
bec39940
DG
2401 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2402 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2403 if (ua_chan_node == NULL) {
2404 continue;
2405 }
2406 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2407 node);
2408
2409 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2410 if (ret < 0) {
2411 continue;
2412 }
2413 }
2414
55cc08a6
DG
2415 rcu_read_unlock();
2416 return ret;
2417}
2418
2419/*
2420 * Add context to a specific event in a channel for global UST domain.
2421 */
2422int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2423 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2424 struct ltt_ust_context *uctx)
2425{
2426 int ret = 0;
bec39940
DG
2427 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2428 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2429 struct ust_app_session *ua_sess;
2430 struct ust_app_event *ua_event;
2431 struct ust_app_channel *ua_chan = NULL;
2432 struct ust_app *app;
2433
2434 rcu_read_lock();
2435
852d0037 2436 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2437 if (!app->compatible) {
2438 /*
2439 * TODO: In time, we should notice the caller of this error by
2440 * telling him that this is a version error.
2441 */
2442 continue;
2443 }
55cc08a6
DG
2444 ua_sess = lookup_session_by_app(usess, app);
2445 if (ua_sess == NULL) {
2446 continue;
2447 }
2448
2449 /* Lookup channel in the ust app session */
bec39940
DG
2450 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2451 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2452 if (ua_chan_node == NULL) {
2453 continue;
2454 }
2455 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2456 node);
2457
bec39940
DG
2458 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2459 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2460 if (ua_event_node == NULL) {
2461 continue;
2462 }
2463 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2464 node);
2465
2466 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2467 if (ret < 0) {
2468 continue;
2469 }
2470 }
2471
55cc08a6
DG
2472 rcu_read_unlock();
2473 return ret;
2474}
76d45b40
DG
2475
2476/*
2477 * Enable event for a channel from a UST session for a specific PID.
2478 */
2479int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2480 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2481{
2482 int ret = 0;
bec39940
DG
2483 struct lttng_ht_iter iter;
2484 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
76d45b40
DG
2485 struct ust_app *app;
2486 struct ust_app_session *ua_sess;
2487 struct ust_app_channel *ua_chan;
2488 struct ust_app_event *ua_event;
2489
2490 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2491
2492 rcu_read_lock();
2493
2494 app = ust_app_find_by_pid(pid);
2495 if (app == NULL) {
2496 ERR("UST app enable event per PID %d not found", pid);
2497 ret = -1;
2498 goto error;
2499 }
2500
e0c7ec2b
DG
2501 if (!app->compatible) {
2502 ret = 0;
2503 goto error;
2504 }
2505
76d45b40
DG
2506 ua_sess = lookup_session_by_app(usess, app);
2507 /* If ua_sess is NULL, there is a code flow error */
2508 assert(ua_sess);
2509
2510 /* Lookup channel in the ust app session */
bec39940
DG
2511 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2512 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2513 /* If the channel is not found, there is a code flow error */
2514 assert(ua_chan_node);
2515
2516 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2517
bec39940
DG
2518 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2519 ua_event_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2520 if (ua_event_node == NULL) {
2521 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2522 if (ret < 0) {
2523 goto error;
2524 }
2525 } else {
2526 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2527
2528 ret = enable_ust_app_event(ua_sess, ua_event, app);
2529 if (ret < 0) {
2530 goto error;
2531 }
2532 }
2533
2534error:
2535 rcu_read_unlock();
2536 return ret;
2537}
7f79d3a1
DG
2538
2539/*
2540 * Disable event for a channel from a UST session for a specific PID.
2541 */
2542int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2543 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2544{
2545 int ret = 0;
bec39940
DG
2546 struct lttng_ht_iter iter;
2547 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
7f79d3a1
DG
2548 struct ust_app *app;
2549 struct ust_app_session *ua_sess;
2550 struct ust_app_channel *ua_chan;
2551 struct ust_app_event *ua_event;
2552
2553 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2554
2555 rcu_read_lock();
2556
2557 app = ust_app_find_by_pid(pid);
2558 if (app == NULL) {
2559 ERR("UST app disable event per PID %d not found", pid);
2560 ret = -1;
2561 goto error;
2562 }
2563
e0c7ec2b
DG
2564 if (!app->compatible) {
2565 ret = 0;
2566 goto error;
2567 }
2568
7f79d3a1
DG
2569 ua_sess = lookup_session_by_app(usess, app);
2570 /* If ua_sess is NULL, there is a code flow error */
2571 assert(ua_sess);
2572
2573 /* Lookup channel in the ust app session */
bec39940
DG
2574 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2575 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2576 if (ua_chan_node == NULL) {
2577 /* Channel does not exist, skip disabling */
2578 goto error;
2579 }
2580 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2581
bec39940
DG
2582 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2583 ua_event_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2584 if (ua_event_node == NULL) {
2585 /* Event does not exist, skip disabling */
2586 goto error;
2587 }
2588 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2589
2590 ret = disable_ust_app_event(ua_sess, ua_event, app);
2591 if (ret < 0) {
2592 goto error;
2593 }
2594
2595error:
2596 rcu_read_unlock();
2597 return ret;
2598}
e0c7ec2b
DG
2599
2600/*
2601 * Validate version of UST apps and set the compatible bit.
2602 */
2603int ust_app_validate_version(int sock)
2604{
2605 int ret;
2606 struct ust_app *app;
2607
2608 rcu_read_lock();
2609
2610 app = find_app_by_sock(sock);
2611 assert(app);
2612
2613 ret = ustctl_tracer_version(sock, &app->version);
2614 if (ret < 0) {
2615 goto error;
2616 }
2617
2618 /* Validate version */
2619 if (app->version.major > UST_APP_MAJOR_VERSION) {
2620 goto error;
2621 }
2622
2623 DBG2("UST app PID %d is compatible with major version %d "
852d0037 2624 "(supporting <= %d)", app->pid, app->version.major,
e0c7ec2b
DG
2625 UST_APP_MAJOR_VERSION);
2626 app->compatible = 1;
2627 rcu_read_unlock();
2628 return 0;
2629
2630error:
2631 DBG2("UST app PID %d is not compatible with major version %d "
852d0037 2632 "(supporting <= %d)", app->pid, app->version.major,
e0c7ec2b
DG
2633 UST_APP_MAJOR_VERSION);
2634 app->compatible = 0;
2635 rcu_read_unlock();
2636 return -1;
2637}
4466912f
DG
2638
2639/*
2640 * Calibrate registered applications.
2641 */
2642int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2643{
2644 int ret = 0;
2645 struct lttng_ht_iter iter;
2646 struct ust_app *app;
2647
2648 rcu_read_lock();
2649
852d0037 2650 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4466912f
DG
2651 if (!app->compatible) {
2652 /*
2653 * TODO: In time, we should notice the caller of this error by
2654 * telling him that this is a version error.
2655 */
2656 continue;
2657 }
2658
852d0037 2659 ret = ustctl_calibrate(app->sock, calibrate);
4466912f
DG
2660 if (ret < 0) {
2661 switch (ret) {
2662 case -ENOSYS:
2663 /* Means that it's not implemented on the tracer side. */
2664 ret = 0;
2665 break;
2666 default:
2667 /* TODO: Report error to user */
2668 DBG2("Calibrate app PID %d returned with error %d",
852d0037 2669 app->pid, ret);
4466912f
DG
2670 break;
2671 }
2672 }
2673 }
2674
2675 DBG("UST app global domain calibration finished");
2676
2677 rcu_read_unlock();
2678
2679 return ret;
2680}
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