Fix: application context leak when enabling context
[lttng-tools.git] / src / bin / lttng-sessiond / agent.c
CommitLineData
0475c50c
DG
1/*
2 * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
bdf64013 3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
0475c50c
DG
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License, version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 51
16 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
6c1c0768 19#define _LGPL_SOURCE
0475c50c 20#include <assert.h>
f20baf8e 21#include <urcu/uatomic.h>
bdf64013 22#include <urcu/rculist.h>
0475c50c
DG
23
24#include <common/common.h>
022d91ba 25#include <common/sessiond-comm/agent.h>
0475c50c 26
f263b7fd
JD
27#include <common/compat/endian.h>
28
022d91ba 29#include "agent.h"
f20baf8e 30#include "ust-app.h"
0475c50c 31#include "utils.h"
23c2bd47
JG
32#include "error.h"
33
34#define AGENT_RET_CODE_INDEX(code) (code - AGENT_RET_CODE_SUCCESS)
35
bdf64013
JG
36/*
37 * Agent application context representation.
38 */
39struct agent_app_ctx {
40 char *provider_name;
41 char *ctx_name;
42
43 /* agent_app_ctx are part of the agent app_ctx_list. */
44 struct cds_list_head list_node;
45
46 /* For call_rcu teardown. */
47 struct rcu_head rcu_node;
48};
49
23c2bd47
JG
50/*
51 * Human readable agent return code.
52 */
53static const char *error_string_array[] = {
54 [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_SUCCESS) ] = "Success",
55 [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_INVALID) ] = "Invalid command",
56 [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_UNKNOWN_NAME) ] = "Unknown logger name",
57
58 /* Last element */
59 [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_NR) ] = "Unknown code",
60};
61
62static
63void log_reply_code(uint32_t in_reply_ret_code)
64{
65 int level = PRINT_DBG3;
66 /*
67 * reply_ret_code and in_reply_ret_code are kept separate to have a
68 * sanitized value (used to retrieve the human readable string) and the
69 * original value which is logged as-is.
70 */
71 uint32_t reply_ret_code = in_reply_ret_code;
72
73 if (reply_ret_code < AGENT_RET_CODE_SUCCESS ||
74 reply_ret_code >= AGENT_RET_CODE_NR) {
75 reply_ret_code = AGENT_RET_CODE_NR;
76 level = PRINT_ERR;
77 }
78
79 LOG(level, "Agent replied with retcode: %s (%"PRIu32")",
80 error_string_array[AGENT_RET_CODE_INDEX(
81 reply_ret_code)],
82 in_reply_ret_code);
83}
0475c50c 84
4a4ab2c3
DG
85/*
86 * Match function for the events hash table lookup by name.
87 */
88static int ht_match_event_by_name(struct cds_lfht_node *node,
89 const void *_key)
90{
022d91ba
DG
91 struct agent_event *event;
92 const struct agent_ht_key *key;
4a4ab2c3
DG
93
94 assert(node);
95 assert(_key);
96
022d91ba 97 event = caa_container_of(node, struct agent_event, node.node);
4a4ab2c3
DG
98 key = _key;
99
100 /* Match 1 elements of the key: name. */
101
102 /* Event name */
103 if (strncmp(event->name, key->name, sizeof(event->name)) != 0) {
104 goto no_match;
105 }
106 /* Match. */
107 return 1;
108
109no_match:
110 return 0;
111}
112
113/*
114 * Match function for the events hash table lookup by name and loglevel.
115 */
116static int ht_match_event(struct cds_lfht_node *node,
117 const void *_key)
118{
022d91ba
DG
119 struct agent_event *event;
120 const struct agent_ht_key *key;
19a97244 121 int ll_match;
4a4ab2c3
DG
122
123 assert(node);
124 assert(_key);
125
022d91ba 126 event = caa_container_of(node, struct agent_event, node.node);
4a4ab2c3
DG
127 key = _key;
128
129 /* Match 2 elements of the key: name and loglevel. */
130
131 /* Event name */
132 if (strncmp(event->name, key->name, sizeof(event->name)) != 0) {
133 goto no_match;
134 }
135
a9319624 136 /* Event loglevel value and type. */
19a97244
PP
137 ll_match = loglevels_match(event->loglevel_type,
138 event->loglevel_value, key->loglevel_type,
139 key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL);
140
141 if (!ll_match) {
4a4ab2c3
DG
142 goto no_match;
143 }
a9319624 144
6b10b3b0
AM
145 /* Filter expression */
146 if (strncmp(event->filter_expression, key->filter_expression,
147 strlen(event->filter_expression)) != 0) {
148 goto no_match;
149 }
150
4a4ab2c3
DG
151 return 1;
152
153no_match:
154 return 0;
155}
156
157/*
022d91ba 158 * Add unique agent event based on the event name and loglevel.
4a4ab2c3 159 */
022d91ba
DG
160static void add_unique_agent_event(struct lttng_ht *ht,
161 struct agent_event *event)
4a4ab2c3
DG
162{
163 struct cds_lfht_node *node_ptr;
022d91ba 164 struct agent_ht_key key;
4a4ab2c3
DG
165
166 assert(ht);
167 assert(ht->ht);
168 assert(event);
169
170 key.name = event->name;
2106efa0 171 key.loglevel_value = event->loglevel_value;
a9319624 172 key.loglevel_type = event->loglevel_type;
6b10b3b0 173 key.filter_expression = event->filter_expression;
4a4ab2c3
DG
174
175 node_ptr = cds_lfht_add_unique(ht->ht,
176 ht->hash_fct(event->node.key, lttng_ht_seed),
177 ht_match_event, &key, &event->node.node);
178 assert(node_ptr == &event->node.node);
179}
180
0475c50c 181/*
022d91ba 182 * URCU delayed agent event reclaim.
0475c50c 183 */
022d91ba 184static void destroy_event_agent_rcu(struct rcu_head *head)
0475c50c
DG
185{
186 struct lttng_ht_node_str *node =
187 caa_container_of(head, struct lttng_ht_node_str, head);
022d91ba
DG
188 struct agent_event *event =
189 caa_container_of(node, struct agent_event, node);
0475c50c 190
992febc7 191 agent_destroy_event(event);
0475c50c
DG
192}
193
f20baf8e 194/*
022d91ba 195 * URCU delayed agent app reclaim.
f20baf8e 196 */
022d91ba 197static void destroy_app_agent_rcu(struct rcu_head *head)
f20baf8e
DG
198{
199 struct lttng_ht_node_ulong *node =
200 caa_container_of(head, struct lttng_ht_node_ulong, head);
022d91ba
DG
201 struct agent_app *app =
202 caa_container_of(node, struct agent_app, node);
f20baf8e
DG
203
204 free(app);
205}
206
207/*
022d91ba
DG
208 * Communication with the agent. Send the message header to the given socket in
209 * big endian.
f20baf8e
DG
210 *
211 * Return 0 on success or else a negative errno message of sendmsg() op.
212 */
213static int send_header(struct lttcomm_sock *sock, uint64_t data_size,
214 uint32_t cmd, uint32_t cmd_version)
215{
216 int ret;
217 ssize_t size;
022d91ba 218 struct lttcomm_agent_hdr msg;
f20baf8e
DG
219
220 assert(sock);
221
53efb85a 222 memset(&msg, 0, sizeof(msg));
f20baf8e
DG
223 msg.data_size = htobe64(data_size);
224 msg.cmd = htobe32(cmd);
225 msg.cmd_version = htobe32(cmd_version);
226
227 size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0);
228 if (size < sizeof(msg)) {
229 ret = -errno;
230 goto error;
231 }
232 ret = 0;
233
234error:
235 return ret;
236}
237
238/*
022d91ba
DG
239 * Communication call with the agent. Send the payload to the given socket. The
240 * header MUST be sent prior to this call.
f20baf8e
DG
241 *
242 * Return 0 on success or else a negative errno value of sendmsg() op.
243 */
bdf64013 244static int send_payload(struct lttcomm_sock *sock, const void *data,
f20baf8e
DG
245 size_t size)
246{
247 int ret;
248 ssize_t len;
249
250 assert(sock);
251 assert(data);
252
253 len = sock->ops->sendmsg(sock, data, size, 0);
254 if (len < size) {
255 ret = -errno;
256 goto error;
257 }
258 ret = 0;
259
260error:
261 return ret;
262}
263
264/*
022d91ba
DG
265 * Communication call with the agent. Receive reply from the agent using the
266 * given socket.
f20baf8e
DG
267 *
268 * Return 0 on success or else a negative errno value from recvmsg() op.
269 */
270static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size)
271{
272 int ret;
273 ssize_t len;
274
275 assert(sock);
276 assert(buf);
277
278 len = sock->ops->recvmsg(sock, buf, size, 0);
279 if (len < size) {
280 ret = -errno;
281 goto error;
282 }
283 ret = 0;
284
285error:
286 return ret;
287}
288
3c6a091f 289/*
428de77a 290 * Internal event listing for a given app. Populate events.
3c6a091f
DG
291 *
292 * Return number of element in the list or else a negative LTTNG_ERR* code.
428de77a
MD
293 * On success, the caller is responsible for freeing the memory
294 * allocated for "events".
3c6a091f 295 */
022d91ba 296static ssize_t list_events(struct agent_app *app, struct lttng_event **events)
3c6a091f
DG
297{
298 int ret, i, len = 0, offset = 0;
299 uint32_t nb_event;
300 size_t data_size;
d84af1a4 301 uint32_t reply_ret_code;
3c6a091f 302 struct lttng_event *tmp_events = NULL;
022d91ba
DG
303 struct lttcomm_agent_list_reply *reply = NULL;
304 struct lttcomm_agent_list_reply_hdr reply_hdr;
3c6a091f
DG
305
306 assert(app);
307 assert(app->sock);
308 assert(events);
309
022d91ba 310 DBG2("Agent listing events for app pid: %d and socket %d", app->pid,
3c6a091f
DG
311 app->sock->fd);
312
022d91ba 313 ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0);
3c6a091f
DG
314 if (ret < 0) {
315 goto error_io;
316 }
317
318 /* Get list header so we know how much we'll receive. */
319 ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr));
320 if (ret < 0) {
321 goto error_io;
322 }
323
d84af1a4
JG
324 reply_ret_code = be32toh(reply_hdr.ret_code);
325 log_reply_code(reply_ret_code);
326 switch (reply_ret_code) {
022d91ba 327 case AGENT_RET_CODE_SUCCESS:
3c6a091f
DG
328 data_size = be32toh(reply_hdr.data_size) + sizeof(*reply);
329 break;
330 default:
3bd9aaeb 331 ret = LTTNG_ERR_UNK;
3c6a091f
DG
332 goto error;
333 }
334
335 reply = zmalloc(data_size);
336 if (!reply) {
337 ret = LTTNG_ERR_NOMEM;
338 goto error;
339 }
340
341 /* Get the list with the appropriate data size. */
342 ret = recv_reply(app->sock, reply, data_size);
343 if (ret < 0) {
344 goto error_io;
345 }
346
347 nb_event = be32toh(reply->nb_event);
348 tmp_events = zmalloc(sizeof(*tmp_events) * nb_event);
349 if (!tmp_events) {
350 ret = LTTNG_ERR_NOMEM;
351 goto error;
352 }
353
354 for (i = 0; i < nb_event; i++) {
355 offset += len;
356 strncpy(tmp_events[i].name, reply->payload + offset,
357 sizeof(tmp_events[i].name));
358 tmp_events[i].pid = app->pid;
359 tmp_events[i].enabled = -1;
360 len = strlen(reply->payload + offset) + 1;
361 }
362
363 *events = tmp_events;
364
365 free(reply);
366 return nb_event;
367
368error_io:
369 ret = LTTNG_ERR_UST_LIST_FAIL;
370error:
371 free(reply);
372 free(tmp_events);
373 return -ret;
374
375}
376
f20baf8e 377/*
022d91ba
DG
378 * Internal enable agent event on a agent application. This function
379 * communicates with the agent to enable a given event.
f20baf8e
DG
380 *
381 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
382 */
022d91ba 383static int enable_event(struct agent_app *app, struct agent_event *event)
f20baf8e
DG
384{
385 int ret;
a0ba721c 386 char *bytes_to_send;
f20baf8e 387 uint64_t data_size;
a0ba721c 388 size_t filter_expression_length;
f4f9d4db 389 uint32_t reply_ret_code;
bdf64013 390 struct lttcomm_agent_enable_event msg;
022d91ba 391 struct lttcomm_agent_generic_reply reply;
f20baf8e
DG
392
393 assert(app);
394 assert(app->sock);
395 assert(event);
396
022d91ba 397 DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name,
f20baf8e
DG
398 app->pid, app->sock->fd);
399
a0ba721c
AM
400 /*
401 * Calculate the payload's size, which is the fixed-size struct followed
402 * by the variable-length filter expression (+1 for the ending \0).
403 */
404 if (!event->filter_expression) {
405 filter_expression_length = 0;
406 } else {
407 filter_expression_length = strlen(event->filter_expression) + 1;
408 }
409 data_size = sizeof(msg) + filter_expression_length;
f20baf8e 410
022d91ba 411 ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0);
f20baf8e
DG
412 if (ret < 0) {
413 goto error_io;
414 }
415
53efb85a 416 memset(&msg, 0, sizeof(msg));
a9bfd666
JG
417 msg.loglevel_value = htobe32(event->loglevel_value);
418 msg.loglevel_type = htobe32(event->loglevel_type);
f20baf8e 419 strncpy(msg.name, event->name, sizeof(msg.name));
a9bfd666 420 msg.filter_expression_length = htobe32(filter_expression_length);
a0ba721c
AM
421
422 bytes_to_send = zmalloc(data_size);
423 if (!bytes_to_send) {
424 ret = LTTNG_ERR_NOMEM;
425 goto error;
426 }
427
428 memcpy(bytes_to_send, &msg, sizeof(msg));
429 if (filter_expression_length > 0) {
430 memcpy(bytes_to_send + sizeof(msg), event->filter_expression,
431 filter_expression_length);
432 }
433
434 ret = send_payload(app->sock, bytes_to_send, data_size);
435 free(bytes_to_send);
f20baf8e
DG
436 if (ret < 0) {
437 goto error_io;
438 }
439
440 ret = recv_reply(app->sock, &reply, sizeof(reply));
441 if (ret < 0) {
442 goto error_io;
443 }
444
f4f9d4db
JG
445 reply_ret_code = be32toh(reply.ret_code);
446 log_reply_code(reply_ret_code);
447 switch (reply_ret_code) {
022d91ba 448 case AGENT_RET_CODE_SUCCESS:
f20baf8e 449 break;
022d91ba 450 case AGENT_RET_CODE_UNKNOWN_NAME:
f20baf8e
DG
451 ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
452 goto error;
453 default:
3bd9aaeb 454 ret = LTTNG_ERR_UNK;
f20baf8e
DG
455 goto error;
456 }
457
458 return LTTNG_OK;
459
460error_io:
461 ret = LTTNG_ERR_UST_ENABLE_FAIL;
462error:
463 return ret;
464}
465
bdf64013
JG
466/*
467 * Send Pascal-style string. Size is sent as a 32-bit big endian integer.
468 */
469static
470int send_pstring(struct lttcomm_sock *sock, const char *str, uint32_t len)
471{
472 int ret;
473 uint32_t len_be;
474
475 len_be = htobe32(len);
476 ret = send_payload(sock, &len_be, sizeof(len_be));
477 if (ret) {
478 goto end;
479 }
480
481 ret = send_payload(sock, str, len);
482 if (ret) {
483 goto end;
484 }
485end:
486 return ret;
487}
488
489/*
490 * Internal enable application context on an agent application. This function
491 * communicates with the agent to enable a given application context.
492 *
493 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
494 */
495static int app_context_op(struct agent_app *app,
496 struct agent_app_ctx *ctx, enum lttcomm_agent_command cmd)
497{
498 int ret;
499 uint32_t reply_ret_code;
500 struct lttcomm_agent_generic_reply reply;
501 size_t app_ctx_provider_name_len, app_ctx_name_len, data_size;
502
503 assert(app);
504 assert(app->sock);
505 assert(ctx);
506 assert(cmd == AGENT_CMD_APP_CTX_ENABLE ||
507 cmd == AGENT_CMD_APP_CTX_DISABLE);
508
509 DBG2("Agent %s application %s:%s for app pid: %d and socket %d",
510 cmd == AGENT_CMD_APP_CTX_ENABLE ? "enabling" : "disabling",
511 ctx->provider_name, ctx->ctx_name,
512 app->pid, app->sock->fd);
513
514 /*
515 * Calculate the payload's size, which consists of the size (u32, BE)
516 * of the provider name, the NULL-terminated provider name string, the
517 * size (u32, BE) of the context name, followed by the NULL-terminated
518 * context name string.
519 */
520 app_ctx_provider_name_len = strlen(ctx->provider_name) + 1;
521 app_ctx_name_len = strlen(ctx->ctx_name) + 1;
522 data_size = sizeof(uint32_t) + app_ctx_provider_name_len +
523 sizeof(uint32_t) + app_ctx_name_len;
524
525 ret = send_header(app->sock, data_size, cmd, 0);
526 if (ret < 0) {
527 goto error_io;
528 }
529
530 if (app_ctx_provider_name_len > UINT32_MAX ||
531 app_ctx_name_len > UINT32_MAX) {
532 ERR("Application context name > MAX_UINT32");
533 ret = LTTNG_ERR_INVALID;
534 goto error;
535 }
536
537 ret = send_pstring(app->sock, ctx->provider_name,
538 (uint32_t) app_ctx_provider_name_len);
539 if (ret < 0) {
540 goto error_io;
541 }
542
543 ret = send_pstring(app->sock, ctx->ctx_name,
544 (uint32_t) app_ctx_name_len);
545 if (ret < 0) {
546 goto error_io;
547 }
548
549 ret = recv_reply(app->sock, &reply, sizeof(reply));
550 if (ret < 0) {
551 goto error_io;
552 }
553
554 reply_ret_code = be32toh(reply.ret_code);
555 log_reply_code(reply_ret_code);
556 switch (reply_ret_code) {
557 case AGENT_RET_CODE_SUCCESS:
558 break;
559 default:
560 ret = LTTNG_ERR_UNK;
561 goto error;
562 }
563
564 return LTTNG_OK;
565
566error_io:
567 ret = LTTNG_ERR_UST_ENABLE_FAIL;
568error:
569 return ret;
570}
571
f20baf8e 572/*
022d91ba
DG
573 * Internal disable agent event call on a agent application. This function
574 * communicates with the agent to disable a given event.
f20baf8e
DG
575 *
576 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
577 */
022d91ba 578static int disable_event(struct agent_app *app, struct agent_event *event)
f20baf8e
DG
579{
580 int ret;
581 uint64_t data_size;
517992f8 582 uint32_t reply_ret_code;
bdf64013 583 struct lttcomm_agent_disable_event msg;
022d91ba 584 struct lttcomm_agent_generic_reply reply;
f20baf8e
DG
585
586 assert(app);
587 assert(app->sock);
588 assert(event);
589
022d91ba 590 DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name,
f20baf8e
DG
591 app->pid, app->sock->fd);
592
593 data_size = sizeof(msg);
594
022d91ba 595 ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0);
f20baf8e
DG
596 if (ret < 0) {
597 goto error_io;
598 }
599
53efb85a 600 memset(&msg, 0, sizeof(msg));
f20baf8e
DG
601 strncpy(msg.name, event->name, sizeof(msg.name));
602 ret = send_payload(app->sock, &msg, sizeof(msg));
603 if (ret < 0) {
604 goto error_io;
605 }
606
607 ret = recv_reply(app->sock, &reply, sizeof(reply));
608 if (ret < 0) {
609 goto error_io;
610 }
611
517992f8
JG
612 reply_ret_code = be32toh(reply.ret_code);
613 log_reply_code(reply_ret_code);
614 switch (reply_ret_code) {
022d91ba
DG
615 case AGENT_RET_CODE_SUCCESS:
616 break;
617 case AGENT_RET_CODE_UNKNOWN_NAME:
618 ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
619 goto error;
620 default:
3bd9aaeb 621 ret = LTTNG_ERR_UNK;
022d91ba 622 goto error;
f20baf8e
DG
623 }
624
625 return LTTNG_OK;
626
627error_io:
628 ret = LTTNG_ERR_UST_DISABLE_FAIL;
629error:
630 return ret;
631}
632
1b500e7a 633/*
022d91ba 634 * Send back the registration DONE command to a given agent application.
1b500e7a
DG
635 *
636 * Return 0 on success or else a negative value.
637 */
022d91ba 638int agent_send_registration_done(struct agent_app *app)
1b500e7a
DG
639{
640 assert(app);
641 assert(app->sock);
642
022d91ba 643 DBG("Agent sending registration done to app socket %d", app->sock->fd);
1b500e7a 644
b26d1f5c 645 return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0);
1b500e7a
DG
646}
647
f20baf8e 648/*
022d91ba 649 * Enable agent event on every agent applications registered with the session
f20baf8e
DG
650 * daemon.
651 *
652 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
653 */
fefd409b
DG
654int agent_enable_event(struct agent_event *event,
655 enum lttng_domain_type domain)
f20baf8e
DG
656{
657 int ret;
022d91ba 658 struct agent_app *app;
f20baf8e
DG
659 struct lttng_ht_iter iter;
660
661 assert(event);
662
663 rcu_read_lock();
664
022d91ba 665 cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app,
f20baf8e 666 node.node) {
fefd409b
DG
667 if (app->domain != domain) {
668 continue;
669 }
670
022d91ba 671 /* Enable event on agent application through TCP socket. */
f20baf8e
DG
672 ret = enable_event(app, event);
673 if (ret != LTTNG_OK) {
674 goto error;
675 }
f20baf8e
DG
676 }
677
3c6a091f 678 event->enabled = 1;
f20baf8e
DG
679 ret = LTTNG_OK;
680
681error:
682 rcu_read_unlock();
683 return ret;
684}
685
bdf64013
JG
686static
687void destroy_app_ctx(struct agent_app_ctx *ctx)
688{
689 free(ctx->provider_name);
690 free(ctx->ctx_name);
691 free(ctx);
692}
693
694static
695struct agent_app_ctx *create_app_ctx(struct lttng_event_context *ctx)
696{
697 struct agent_app_ctx *agent_ctx = NULL;
698
699 if (!ctx) {
700 goto end;
701 }
702
703 assert(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT);
704 agent_ctx = zmalloc(sizeof(*ctx));
705 if (!agent_ctx) {
706 goto end;
707 }
708
709 agent_ctx->provider_name = strdup(ctx->u.app_ctx.provider_name);
710 agent_ctx->ctx_name = strdup(ctx->u.app_ctx.ctx_name);
711 if (!agent_ctx->provider_name || !agent_ctx->ctx_name) {
712 destroy_app_ctx(agent_ctx);
713 agent_ctx = NULL;
714 }
715end:
716 return agent_ctx;
717}
718
719/*
720 * Enable agent context on every agent applications registered with the session
721 * daemon.
722 *
723 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
724 */
725int agent_enable_context(struct lttng_event_context *ctx,
726 enum lttng_domain_type domain)
727{
728 int ret;
729 struct agent_app *app;
730 struct lttng_ht_iter iter;
731
732 assert(ctx);
733 if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
734 ret = LTTNG_ERR_INVALID;
735 goto error;
736 }
737
738 rcu_read_lock();
739
740 cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app,
741 node.node) {
742 struct agent_app_ctx *agent_ctx;
743
744 if (app->domain != domain) {
745 continue;
746 }
747
748 agent_ctx = create_app_ctx(ctx);
749 if (!agent_ctx) {
a33c2651 750 ret = LTTNG_ERR_NOMEM;
bdf64013
JG
751 goto error_unlock;
752 }
753
754 /* Enable event on agent application through TCP socket. */
755 ret = app_context_op(app, agent_ctx, AGENT_CMD_APP_CTX_ENABLE);
c12618b5 756 destroy_app_ctx(agent_ctx);
bdf64013 757 if (ret != LTTNG_OK) {
bdf64013
JG
758 goto error_unlock;
759 }
760 }
761
762 ret = LTTNG_OK;
763
764error_unlock:
765 rcu_read_unlock();
766error:
767 return ret;
768}
769
f20baf8e 770/*
bdf64013 771 * Disable agent event on every agent application registered with the session
f20baf8e
DG
772 * daemon.
773 *
774 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
775 */
fefd409b
DG
776int agent_disable_event(struct agent_event *event,
777 enum lttng_domain_type domain)
f20baf8e 778{
f1bc0129 779 int ret = LTTNG_OK;
022d91ba 780 struct agent_app *app;
f20baf8e
DG
781 struct lttng_ht_iter iter;
782
783 assert(event);
f1bc0129
JG
784 if (!event->enabled) {
785 goto end;
786 }
f20baf8e
DG
787
788 rcu_read_lock();
789
022d91ba 790 cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app,
f20baf8e 791 node.node) {
fefd409b
DG
792 if (app->domain != domain) {
793 continue;
794 }
795
022d91ba 796 /* Enable event on agent application through TCP socket. */
f20baf8e
DG
797 ret = disable_event(app, event);
798 if (ret != LTTNG_OK) {
799 goto error;
800 }
f20baf8e
DG
801 }
802
3c6a091f 803 event->enabled = 0;
f20baf8e
DG
804
805error:
806 rcu_read_unlock();
f1bc0129 807end:
f20baf8e
DG
808 return ret;
809}
810
bdf64013
JG
811/*
812 * Disable agent context on every agent application registered with the session
813 * daemon.
814 *
815 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
816 */
817int disable_context(struct agent_app_ctx *ctx, enum lttng_domain_type domain)
818{
819 int ret = LTTNG_OK;
820 struct agent_app *app;
821 struct lttng_ht_iter iter;
822
823 assert(ctx);
824
825 rcu_read_lock();
826 DBG2("Disabling agent application context %s:%s",
827 ctx->provider_name, ctx->ctx_name);
828 cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app,
829 node.node) {
830 if (app->domain != domain) {
831 continue;
832 }
833
834 ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_DISABLE);
835 if (ret != LTTNG_OK) {
836 goto end;
837 }
838 }
839end:
840 rcu_read_unlock();
841 return ret;
842}
843
f20baf8e 844/*
022d91ba
DG
845 * Ask every agent for the list of possible event. Events is allocated with the
846 * events of every agent application.
f20baf8e
DG
847 *
848 * Return the number of events or else a negative value.
849 */
f60140a1
DG
850int agent_list_events(struct lttng_event **events,
851 enum lttng_domain_type domain)
f20baf8e
DG
852{
853 int ret;
854 size_t nbmem, count = 0;
022d91ba 855 struct agent_app *app;
aae6255e 856 struct lttng_event *tmp_events = NULL;
f20baf8e
DG
857 struct lttng_ht_iter iter;
858
859 assert(events);
860
0e115563
DG
861 DBG2("Agent listing events for domain %d", domain);
862
f20baf8e
DG
863 nbmem = UST_APP_EVENT_LIST_SIZE;
864 tmp_events = zmalloc(nbmem * sizeof(*tmp_events));
865 if (!tmp_events) {
022d91ba 866 PERROR("zmalloc agent list events");
f20baf8e
DG
867 ret = -ENOMEM;
868 goto error;
869 }
870
871 rcu_read_lock();
022d91ba 872 cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app,
f20baf8e
DG
873 node.node) {
874 ssize_t nb_ev;
022d91ba 875 struct lttng_event *agent_events;
f20baf8e 876
f60140a1
DG
877 /* Skip domain not asked by the list. */
878 if (app->domain != domain) {
879 continue;
880 }
881
022d91ba 882 nb_ev = list_events(app, &agent_events);
f20baf8e
DG
883 if (nb_ev < 0) {
884 ret = nb_ev;
428de77a 885 goto error_unlock;
f20baf8e
DG
886 }
887
53efb85a 888 if (count + nb_ev > nbmem) {
f20baf8e 889 /* In case the realloc fails, we free the memory */
53efb85a
MD
890 struct lttng_event *new_tmp_events;
891 size_t new_nbmem;
892
893 new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1);
022d91ba 894 DBG2("Reallocating agent event list from %zu to %zu entries",
53efb85a
MD
895 nbmem, new_nbmem);
896 new_tmp_events = realloc(tmp_events,
897 new_nbmem * sizeof(*new_tmp_events));
898 if (!new_tmp_events) {
022d91ba 899 PERROR("realloc agent events");
f20baf8e 900 ret = -ENOMEM;
022d91ba 901 free(agent_events);
428de77a 902 goto error_unlock;
f20baf8e 903 }
53efb85a
MD
904 /* Zero the new memory */
905 memset(new_tmp_events + nbmem, 0,
906 (new_nbmem - nbmem) * sizeof(*new_tmp_events));
907 nbmem = new_nbmem;
908 tmp_events = new_tmp_events;
f20baf8e 909 }
022d91ba 910 memcpy(tmp_events + count, agent_events,
53efb85a 911 nb_ev * sizeof(*tmp_events));
022d91ba 912 free(agent_events);
f20baf8e
DG
913 count += nb_ev;
914 }
915 rcu_read_unlock();
916
917 ret = count;
918 *events = tmp_events;
aae6255e 919 return ret;
f20baf8e 920
428de77a
MD
921error_unlock:
922 rcu_read_unlock();
f20baf8e 923error:
aae6255e 924 free(tmp_events);
f20baf8e
DG
925 return ret;
926}
927
928/*
022d91ba 929 * Create a agent app object using the given PID.
f20baf8e
DG
930 *
931 * Return newly allocated object or else NULL on error.
932 */
fefd409b
DG
933struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain,
934 struct lttcomm_sock *sock)
f20baf8e 935{
022d91ba 936 struct agent_app *app;
f20baf8e
DG
937
938 assert(sock);
939
940 app = zmalloc(sizeof(*app));
941 if (!app) {
022d91ba 942 PERROR("zmalloc agent create");
f20baf8e
DG
943 goto error;
944 }
945
946 app->pid = pid;
fefd409b 947 app->domain = domain;
f20baf8e 948 app->sock = sock;
f20baf8e
DG
949 lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd);
950
951error:
952 return app;
953}
954
955/*
022d91ba 956 * Lookup agent app by socket in the global hash table.
f20baf8e
DG
957 *
958 * RCU read side lock MUST be acquired.
959 *
960 * Return object if found else NULL.
961 */
022d91ba 962struct agent_app *agent_find_app_by_sock(int sock)
f20baf8e
DG
963{
964 struct lttng_ht_node_ulong *node;
965 struct lttng_ht_iter iter;
022d91ba 966 struct agent_app *app;
f20baf8e
DG
967
968 assert(sock >= 0);
969
022d91ba 970 lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter);
f20baf8e
DG
971 node = lttng_ht_iter_get_node_ulong(&iter);
972 if (node == NULL) {
973 goto error;
974 }
022d91ba 975 app = caa_container_of(node, struct agent_app, node);
f20baf8e 976
022d91ba 977 DBG3("Agent app pid %d found by sock %d.", app->pid, sock);
f20baf8e
DG
978 return app;
979
980error:
022d91ba 981 DBG3("Agent app NOT found by sock %d.", sock);
f20baf8e
DG
982 return NULL;
983}
984
985/*
022d91ba 986 * Add agent application object to the global hash table.
f20baf8e 987 */
022d91ba 988void agent_add_app(struct agent_app *app)
f20baf8e
DG
989{
990 assert(app);
991
022d91ba 992 DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid);
022d91ba 993 lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node);
f20baf8e
DG
994}
995
f20baf8e 996/*
022d91ba 997 * Delete agent application from the global hash table.
d558f236
JG
998 *
999 * rcu_read_lock() must be held by the caller.
f20baf8e 1000 */
022d91ba 1001void agent_delete_app(struct agent_app *app)
f20baf8e
DG
1002{
1003 int ret;
1004 struct lttng_ht_iter iter;
1005
1006 assert(app);
1007
022d91ba 1008 DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd);
f20baf8e
DG
1009
1010 iter.iter.node = &app->node.node;
022d91ba 1011 ret = lttng_ht_del(agent_apps_ht_by_sock, &iter);
f20baf8e
DG
1012 assert(!ret);
1013}
1014
1015/*
e785906c 1016 * Destroy an agent application object by detaching it from its corresponding
022d91ba 1017 * UST app if one is connected by closing the socket. Finally, perform a
428de77a 1018 * delayed memory reclaim.
f20baf8e 1019 */
022d91ba 1020void agent_destroy_app(struct agent_app *app)
f20baf8e
DG
1021{
1022 assert(app);
1023
1024 if (app->sock) {
1025 app->sock->ops->close(app->sock);
1026 lttcomm_destroy_sock(app->sock);
1027 }
1028
022d91ba 1029 call_rcu(&app->node.head, destroy_app_agent_rcu);
f20baf8e
DG
1030}
1031
0475c50c 1032/*
022d91ba 1033 * Initialize an already allocated agent object.
0475c50c
DG
1034 *
1035 * Return 0 on success or else a negative errno value.
1036 */
022d91ba 1037int agent_init(struct agent *agt)
0475c50c
DG
1038{
1039 int ret;
1040
022d91ba 1041 assert(agt);
0475c50c 1042
022d91ba
DG
1043 agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
1044 if (!agt->events) {
0475c50c
DG
1045 ret = -ENOMEM;
1046 goto error;
1047 }
fefd409b 1048 lttng_ht_node_init_u64(&agt->node, agt->domain);
0475c50c 1049
bdf64013 1050 CDS_INIT_LIST_HEAD(&agt->app_ctx_list);
0475c50c
DG
1051 return 0;
1052
1053error:
1054 return ret;
1055}
1056
fefd409b
DG
1057/*
1058 * Add agent object to the given hash table.
1059 */
1060void agent_add(struct agent *agt, struct lttng_ht *ht)
1061{
1062 assert(agt);
1063 assert(ht);
1064
1065 DBG3("Agent adding from domain %d", agt->domain);
1066
fefd409b 1067 lttng_ht_add_unique_u64(ht, &agt->node);
fefd409b
DG
1068}
1069
1070/*
1071 * Create an agent object for the given domain.
1072 *
1073 * Return the allocated agent or NULL on error.
1074 */
1075struct agent *agent_create(enum lttng_domain_type domain)
1076{
1077 int ret;
1078 struct agent *agt;
1079
3b5f70d4 1080 agt = zmalloc(sizeof(struct agent));
fefd409b
DG
1081 if (!agt) {
1082 goto error;
1083 }
1084 agt->domain = domain;
1085
1086 ret = agent_init(agt);
1087 if (ret < 0) {
1088 free(agt);
988ae332 1089 agt = NULL;
fefd409b
DG
1090 goto error;
1091 }
1092
1093error:
1094 return agt;
1095}
1096
0475c50c 1097/*
51755dc8
JG
1098 * Create a newly allocated agent event data structure.
1099 * Ownership of filter_expression is taken.
0475c50c
DG
1100 *
1101 * Return a new object else NULL on error.
1102 */
022d91ba 1103struct agent_event *agent_create_event(const char *name,
a9319624 1104 enum lttng_loglevel_type loglevel_type, int loglevel_value,
51755dc8 1105 struct lttng_filter_bytecode *filter, char *filter_expression)
0475c50c 1106{
51755dc8 1107 struct agent_event *event = NULL;
0475c50c 1108
6b10b3b0
AM
1109 DBG3("Agent create new event with name %s, loglevel type %d, \
1110 loglevel value %d and filter %s",
40111ba1
JG
1111 name, loglevel_type, loglevel_value,
1112 filter_expression ? filter_expression : "NULL");
0475c50c 1113
51755dc8
JG
1114 if (!name) {
1115 ERR("Failed to create agent event; no name provided.");
0475c50c
DG
1116 goto error;
1117 }
1118
51755dc8
JG
1119 event = zmalloc(sizeof(*event));
1120 if (!event) {
1121 goto error;
0475c50c
DG
1122 }
1123
51755dc8
JG
1124 strncpy(event->name, name, sizeof(event->name));
1125 event->name[sizeof(event->name) - 1] = '\0';
1126 lttng_ht_node_init_str(&event->node, event->name);
be6a6276 1127
2106efa0 1128 event->loglevel_value = loglevel_value;
51755dc8
JG
1129 event->loglevel_type = loglevel_type;
1130 event->filter = filter;
1131 event->filter_expression = filter_expression;
0475c50c
DG
1132error:
1133 return event;
1134}
1135
1136/*
022d91ba 1137 * Unique add of a agent event to an agent object.
0475c50c 1138 */
022d91ba 1139void agent_add_event(struct agent_event *event, struct agent *agt)
0475c50c
DG
1140{
1141 assert(event);
022d91ba
DG
1142 assert(agt);
1143 assert(agt->events);
0475c50c 1144
022d91ba 1145 DBG3("Agent adding event %s", event->name);
022d91ba 1146 add_unique_agent_event(agt->events, event);
022d91ba 1147 agt->being_used = 1;
0475c50c
DG
1148}
1149
bdf64013
JG
1150/*
1151 * Unique add of a agent context to an agent object.
1152 */
1153int agent_add_context(struct lttng_event_context *ctx, struct agent *agt)
1154{
1155 int ret = LTTNG_OK;
1156 struct agent_app_ctx *agent_ctx = NULL;
1157
1158 assert(ctx);
1159 assert(agt);
1160 assert(agt->events);
1161 assert(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT);
1162
1163 agent_ctx = create_app_ctx(ctx);
1164 if (!agent_ctx) {
1165 ret = LTTNG_ERR_NOMEM;
1166 goto end;
1167 }
1168
1169 DBG3("Agent adding context %s:%s", ctx->u.app_ctx.provider_name,
1170 ctx->u.app_ctx.ctx_name);
1171 cds_list_add_tail_rcu(&agent_ctx->list_node, &agt->app_ctx_list);
1172end:
1173 return ret;
1174}
1175
0475c50c 1176/*
e261a6cc 1177 * Find multiple agent events sharing the given name.
4a4ab2c3 1178 *
e261a6cc
PP
1179 * RCU read side lock MUST be acquired. It must be held for the
1180 * duration of the iteration.
4a4ab2c3 1181 *
e261a6cc 1182 * Sets the given iterator.
4a4ab2c3 1183 */
e261a6cc
PP
1184void agent_find_events_by_name(const char *name, struct agent *agt,
1185 struct lttng_ht_iter* iter)
4a4ab2c3 1186{
4a4ab2c3 1187 struct lttng_ht *ht;
022d91ba 1188 struct agent_ht_key key;
4a4ab2c3
DG
1189
1190 assert(name);
022d91ba
DG
1191 assert(agt);
1192 assert(agt->events);
e261a6cc 1193 assert(iter);
4a4ab2c3 1194
022d91ba 1195 ht = agt->events;
4a4ab2c3
DG
1196 key.name = name;
1197
1198 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
e261a6cc
PP
1199 ht_match_event_by_name, &key, &iter->iter);
1200}
4a4ab2c3 1201
e261a6cc
PP
1202/*
1203 * Get the next agent event duplicate by name. This should be called
1204 * after a call to agent_find_events_by_name() to iterate on events.
1205 *
1206 * The RCU read lock must be held during the iteration and for as long
1207 * as the object the iterator points to remains in use.
1208 */
1209void agent_event_next_duplicate(const char *name,
1210 struct agent *agt, struct lttng_ht_iter* iter)
1211{
1212 struct agent_ht_key key;
4a4ab2c3 1213
e261a6cc
PP
1214 key.name = name;
1215
1216 cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name,
1217 &key, &iter->iter);
4a4ab2c3
DG
1218}
1219
1220/*
6b10b3b0 1221 * Find a agent event in the given agent using name, loglevel and filter.
0475c50c 1222 *
1e17eae2
JG
1223 * RCU read side lock MUST be acquired. It must be kept for as long as
1224 * the returned agent_event is used.
0475c50c
DG
1225 *
1226 * Return object if found else NULL.
1227 */
a9319624
PP
1228struct agent_event *agent_find_event(const char *name,
1229 enum lttng_loglevel_type loglevel_type, int loglevel_value,
6b10b3b0 1230 char *filter_expression, struct agent *agt)
0475c50c
DG
1231{
1232 struct lttng_ht_node_str *node;
1233 struct lttng_ht_iter iter;
4a4ab2c3 1234 struct lttng_ht *ht;
022d91ba 1235 struct agent_ht_key key;
0475c50c
DG
1236
1237 assert(name);
022d91ba
DG
1238 assert(agt);
1239 assert(agt->events);
0475c50c 1240
022d91ba 1241 ht = agt->events;
4a4ab2c3 1242 key.name = name;
2106efa0 1243 key.loglevel_value = loglevel_value;
a9319624 1244 key.loglevel_type = loglevel_type;
6b10b3b0 1245 key.filter_expression = filter_expression;
4a4ab2c3
DG
1246
1247 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
1248 ht_match_event, &key, &iter.iter);
0475c50c
DG
1249 node = lttng_ht_iter_get_node_str(&iter);
1250 if (node == NULL) {
1251 goto error;
1252 }
1253
022d91ba
DG
1254 DBG3("Agent event found %s.", name);
1255 return caa_container_of(node, struct agent_event, node);
0475c50c
DG
1256
1257error:
a51e817b 1258 DBG3("Agent event NOT found %s.", name);
0475c50c
DG
1259 return NULL;
1260}
1261
0475c50c 1262/*
022d91ba
DG
1263 * Free given agent event. This event must not be globally visible at this
1264 * point (only expected to be used on failure just after event creation). After
1265 * this call, the pointer is not usable anymore.
0475c50c 1266 */
022d91ba 1267void agent_destroy_event(struct agent_event *event)
0475c50c
DG
1268{
1269 assert(event);
1270
971da06a 1271 free(event->filter);
8404118c 1272 free(event->filter_expression);
51755dc8 1273 free(event->exclusion);
0475c50c
DG
1274 free(event);
1275}
1276
bdf64013
JG
1277static
1278void destroy_app_ctx_rcu(struct rcu_head *head)
1279{
1280 struct agent_app_ctx *ctx =
1281 caa_container_of(head, struct agent_app_ctx, rcu_node);
1282
1283 destroy_app_ctx(ctx);
1284}
1285
0475c50c 1286/*
35ed21a5 1287 * Destroy an agent completely.
0475c50c 1288 */
022d91ba 1289void agent_destroy(struct agent *agt)
0475c50c
DG
1290{
1291 struct lttng_ht_node_str *node;
1292 struct lttng_ht_iter iter;
bdf64013 1293 struct agent_app_ctx *ctx;
0475c50c 1294
022d91ba 1295 assert(agt);
0475c50c 1296
022d91ba 1297 DBG3("Agent destroy");
0475c50c 1298
0475c50c 1299 rcu_read_lock();
022d91ba 1300 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) {
0475c50c 1301 int ret;
022d91ba 1302 struct agent_event *event;
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1303
1304 /*
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1305 * When destroying an event, we have to try to disable it on the
1306 * agent side so the event stops generating data. The return
1307 * value is not important since we have to continue anyway
1308 * destroying the object.
29c0fd4d 1309 */
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1310 event = caa_container_of(node, struct agent_event, node);
1311 (void) agent_disable_event(event, agt->domain);
0475c50c 1312
022d91ba 1313 ret = lttng_ht_del(agt->events, &iter);
0475c50c 1314 assert(!ret);
022d91ba 1315 call_rcu(&node->head, destroy_event_agent_rcu);
0475c50c 1316 }
0475c50c 1317
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1318 cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) {
1319 (void) disable_context(ctx, agt->domain);
1320 cds_list_del(&ctx->list_node);
1321 call_rcu(&ctx->rcu_node, destroy_app_ctx_rcu);
1322 }
1323 rcu_read_unlock();
f8be902b 1324 ht_cleanup_push(agt->events);
35ed21a5 1325 free(agt);
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1326}
1327
1328/*
6a4e4039 1329 * Allocate agent_apps_ht_by_sock.
f20baf8e 1330 */
6a4e4039 1331int agent_app_ht_alloc(void)
f20baf8e 1332{
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1333 int ret = 0;
1334
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1335 agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1336 if (!agent_apps_ht_by_sock) {
6a4e4039 1337 ret = -1;
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1338 }
1339
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1340 return ret;
1341}
1342
1343/*
1344 * Destroy a agent application by socket.
1345 */
1346void agent_destroy_app_by_sock(int sock)
1347{
1348 struct agent_app *app;
1349
1350 assert(sock >= 0);
1351
1352 /*
1353 * Not finding an application is a very important error that should NEVER
1354 * happen. The hash table deletion is ONLY done through this call when the
1355 * main sessiond thread is torn down.
1356 */
1357 rcu_read_lock();
1358 app = agent_find_app_by_sock(sock);
1359 assert(app);
1360
1361 /* RCU read side lock is assumed to be held by this function. */
1362 agent_delete_app(app);
1363
1364 /* The application is freed in a RCU call but the socket is closed here. */
1365 agent_destroy_app(app);
1366 rcu_read_unlock();
1367}
1368
1369/*
1370 * Clean-up the agent app hash table and destroy it.
1371 */
1372void agent_app_ht_clean(void)
1373{
1374 struct lttng_ht_node_ulong *node;
1375 struct lttng_ht_iter iter;
1376
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1377 if (!agent_apps_ht_by_sock) {
1378 return;
1379 }
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1380 rcu_read_lock();
1381 cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) {
1382 struct agent_app *app;
1383
1384 app = caa_container_of(node, struct agent_app, node);
1385 agent_destroy_app_by_sock(app->sock->fd);
1386 }
1387 rcu_read_unlock();
1388
1389 lttng_ht_destroy(agent_apps_ht_by_sock);
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1390}
1391
1392/*
022d91ba 1393 * Update a agent application (given socket) using the given agent.
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1394 *
1395 * Note that this function is most likely to be used with a tracing session
1396 * thus the caller should make sure to hold the appropriate lock(s).
1397 */
022d91ba 1398void agent_update(struct agent *agt, int sock)
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1399{
1400 int ret;
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1401 struct agent_app *app;
1402 struct agent_event *event;
f20baf8e 1403 struct lttng_ht_iter iter;
bdf64013 1404 struct agent_app_ctx *ctx;
f20baf8e 1405
022d91ba 1406 assert(agt);
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1407 assert(sock >= 0);
1408
022d91ba 1409 DBG("Agent updating app socket %d", sock);
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1410
1411 rcu_read_lock();
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1412 app = agent_find_app_by_sock(sock);
1413 /*
1414 * We are in the registration path thus if the application is gone,
1415 * there is a serious code flow error.
1416 */
1417 assert(app);
022d91ba 1418 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
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1419 /* Skip event if disabled. */
1420 if (!event->enabled) {
1421 continue;
1422 }
1423
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1424 ret = enable_event(app, event);
1425 if (ret != LTTNG_OK) {
022d91ba 1426 DBG2("Agent update unable to enable event %s on app pid: %d sock %d",
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1427 event->name, app->pid, app->sock->fd);
1428 /* Let's try the others here and don't assume the app is dead. */
1429 continue;
1430 }
1431 }
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1432
1433 cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) {
1434 ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_ENABLE);
1435 if (ret != LTTNG_OK) {
1436 DBG2("Agent update unable to add application context %s:%s on app pid: %d sock %d",
1437 ctx->provider_name, ctx->ctx_name,
1438 app->pid, app->sock->fd);
1439 continue;
1440 }
1441 }
1442
f20baf8e 1443 rcu_read_unlock();
0475c50c 1444}
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