Fix: Teardown of thread_manage_clients on failure of listen/create_poll
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
CommitLineData
2f77fc4b
DG
1/*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18#define _GNU_SOURCE
19#include <assert.h>
20#include <urcu/list.h>
21#include <urcu/uatomic.h>
22
23#include <common/defaults.h>
24#include <common/common.h>
25#include <common/sessiond-comm/sessiond-comm.h>
26#include <common/relayd/relayd.h>
27
28#include "channel.h"
29#include "consumer.h"
30#include "event.h"
31#include "kernel.h"
32#include "kernel-consumer.h"
33#include "lttng-sessiond.h"
34#include "utils.h"
35
36#include "cmd.h"
37
38/*
39 * Used to keep a unique index for each relayd socket created where this value
40 * is associated with streams on the consumer so it can match the right relayd
41 * to send to.
42 *
43 * This value should be incremented atomically for safety purposes and future
44 * possible concurrent access.
45 */
46static unsigned int relayd_net_seq_idx;
47
48/*
49 * Create a session path used by list_lttng_sessions for the case that the
50 * session consumer is on the network.
51 */
52static int build_network_session_path(char *dst, size_t size,
53 struct ltt_session *session)
54{
55 int ret, kdata_port, udata_port;
56 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
57 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
58
59 assert(session);
60 assert(dst);
61
62 memset(tmp_urls, 0, sizeof(tmp_urls));
63 memset(tmp_uurl, 0, sizeof(tmp_uurl));
64
65 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
66
67 if (session->kernel_session && session->kernel_session->consumer) {
68 kuri = &session->kernel_session->consumer->dst.net.control;
69 kdata_port = session->kernel_session->consumer->dst.net.data.port;
70 }
71
72 if (session->ust_session && session->ust_session->consumer) {
73 uuri = &session->ust_session->consumer->dst.net.control;
74 udata_port = session->ust_session->consumer->dst.net.data.port;
75 }
76
77 if (uuri == NULL && kuri == NULL) {
78 uri = &session->consumer->dst.net.control;
79 kdata_port = session->consumer->dst.net.data.port;
80 } else if (kuri && uuri) {
81 ret = uri_compare(kuri, uuri);
82 if (ret) {
83 /* Not Equal */
84 uri = kuri;
85 /* Build uuri URL string */
86 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
87 if (ret < 0) {
88 goto error;
89 }
90 } else {
91 uri = kuri;
92 }
93 } else if (kuri && uuri == NULL) {
94 uri = kuri;
95 } else if (uuri && kuri == NULL) {
96 uri = uuri;
97 }
98
99 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
100 if (ret < 0) {
101 goto error;
102 }
103
104 if (strlen(tmp_uurl) > 0) {
105 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
106 tmp_urls, kdata_port, tmp_uurl, udata_port);
107 } else {
108 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, kdata_port);
109 }
110
111error:
112 return ret;
113}
114
115/*
116 * Fill lttng_channel array of all channels.
117 */
118static void list_lttng_channels(int domain, struct ltt_session *session,
119 struct lttng_channel *channels)
120{
121 int i = 0;
122 struct ltt_kernel_channel *kchan;
123
124 DBG("Listing channels for session %s", session->name);
125
126 switch (domain) {
127 case LTTNG_DOMAIN_KERNEL:
128 /* Kernel channels */
129 if (session->kernel_session != NULL) {
130 cds_list_for_each_entry(kchan,
131 &session->kernel_session->channel_list.head, list) {
132 /* Copy lttng_channel struct to array */
133 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
134 channels[i].enabled = kchan->enabled;
135 i++;
136 }
137 }
138 break;
139 case LTTNG_DOMAIN_UST:
140 {
141 struct lttng_ht_iter iter;
142 struct ltt_ust_channel *uchan;
143
144 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
145 &iter.iter, uchan, node.node) {
146 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
147 channels[i].attr.overwrite = uchan->attr.overwrite;
148 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
149 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
150 channels[i].attr.switch_timer_interval =
151 uchan->attr.switch_timer_interval;
152 channels[i].attr.read_timer_interval =
153 uchan->attr.read_timer_interval;
154 channels[i].enabled = uchan->enabled;
155 switch (uchan->attr.output) {
156 case LTTNG_UST_MMAP:
157 default:
158 channels[i].attr.output = LTTNG_EVENT_MMAP;
159 break;
160 }
161 i++;
162 }
163 break;
164 }
165 default:
166 break;
167 }
168}
169
170/*
171 * Create a list of ust global domain events.
172 */
173static int list_lttng_ust_global_events(char *channel_name,
174 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
175{
176 int i = 0, ret = 0;
177 unsigned int nb_event = 0;
178 struct lttng_ht_iter iter;
179 struct lttng_ht_node_str *node;
180 struct ltt_ust_channel *uchan;
181 struct ltt_ust_event *uevent;
182 struct lttng_event *tmp;
183
184 DBG("Listing UST global events for channel %s", channel_name);
185
186 rcu_read_lock();
187
188 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
189 node = lttng_ht_iter_get_node_str(&iter);
190 if (node == NULL) {
f73fabfd 191 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
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192 goto error;
193 }
194
195 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
196
197 nb_event += lttng_ht_get_count(uchan->events);
198
199 if (nb_event == 0) {
200 ret = nb_event;
201 goto error;
202 }
203
204 DBG3("Listing UST global %d events", nb_event);
205
206 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
207 if (tmp == NULL) {
f73fabfd 208 ret = LTTNG_ERR_FATAL;
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209 goto error;
210 }
211
212 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
213 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
214 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
215 tmp[i].enabled = uevent->enabled;
216
217 switch (uevent->attr.instrumentation) {
218 case LTTNG_UST_TRACEPOINT:
219 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
220 break;
221 case LTTNG_UST_PROBE:
222 tmp[i].type = LTTNG_EVENT_PROBE;
223 break;
224 case LTTNG_UST_FUNCTION:
225 tmp[i].type = LTTNG_EVENT_FUNCTION;
226 break;
227 }
228
229 tmp[i].loglevel = uevent->attr.loglevel;
230 switch (uevent->attr.loglevel_type) {
231 case LTTNG_UST_LOGLEVEL_ALL:
232 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
233 break;
234 case LTTNG_UST_LOGLEVEL_RANGE:
235 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
236 break;
237 case LTTNG_UST_LOGLEVEL_SINGLE:
238 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
239 break;
240 }
241 if (uevent->filter) {
242 tmp[i].filter = 1;
243 }
244 i++;
245 }
246
247 ret = nb_event;
248 *events = tmp;
249
250error:
251 rcu_read_unlock();
252 return ret;
253}
254
255/*
256 * Fill lttng_event array of all kernel events in the channel.
257 */
258static int list_lttng_kernel_events(char *channel_name,
259 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
260{
261 int i = 0, ret;
262 unsigned int nb_event;
263 struct ltt_kernel_event *event;
264 struct ltt_kernel_channel *kchan;
265
266 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
267 if (kchan == NULL) {
f73fabfd 268 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
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269 goto error;
270 }
271
272 nb_event = kchan->event_count;
273
274 DBG("Listing events for channel %s", kchan->channel->name);
275
276 if (nb_event == 0) {
f73fabfd 277 goto end;
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278 }
279
280 *events = zmalloc(nb_event * sizeof(struct lttng_event));
281 if (*events == NULL) {
f73fabfd 282 ret = LTTNG_ERR_FATAL;
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283 goto error;
284 }
285
286 /* Kernel channels */
287 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
288 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
289 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
290 (*events)[i].enabled = event->enabled;
291
292 switch (event->event->instrumentation) {
293 case LTTNG_KERNEL_TRACEPOINT:
294 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
295 break;
296 case LTTNG_KERNEL_KPROBE:
297 case LTTNG_KERNEL_KRETPROBE:
298 (*events)[i].type = LTTNG_EVENT_PROBE;
299 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
300 sizeof(struct lttng_kernel_kprobe));
301 break;
302 case LTTNG_KERNEL_FUNCTION:
303 (*events)[i].type = LTTNG_EVENT_FUNCTION;
304 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
305 sizeof(struct lttng_kernel_function));
306 break;
307 case LTTNG_KERNEL_NOOP:
308 (*events)[i].type = LTTNG_EVENT_NOOP;
309 break;
310 case LTTNG_KERNEL_SYSCALL:
311 (*events)[i].type = LTTNG_EVENT_SYSCALL;
312 break;
313 case LTTNG_KERNEL_ALL:
314 assert(0);
315 break;
316 }
317 i++;
318 }
319
f73fabfd 320end:
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321 return nb_event;
322
323error:
f73fabfd
DG
324 /* Negate the error code to differentiate the size from an error */
325 return -ret;
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326}
327
328/*
329 * Add URI so the consumer output object. Set the correct path depending on the
330 * domain adding the default trace directory.
331 */
332static int add_uri_to_consumer(struct consumer_output *consumer,
333 struct lttng_uri *uri, int domain, const char *session_name)
334{
f73fabfd 335 int ret = LTTNG_OK;
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DG
336 const char *default_trace_dir;
337
338 assert(uri);
339
340 if (consumer == NULL) {
341 DBG("No consumer detected. Don't add URI. Stopping.");
f73fabfd 342 ret = LTTNG_ERR_NO_CONSUMER;
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DG
343 goto error;
344 }
345
346 switch (domain) {
347 case LTTNG_DOMAIN_KERNEL:
348 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
349 break;
350 case LTTNG_DOMAIN_UST:
351 default_trace_dir = DEFAULT_UST_TRACE_DIR;
352 break;
353 default:
354 /*
355 * This case is possible is we try to add the URI to the global tracing
356 * session consumer object which in this case there is no subdir.
357 */
358 default_trace_dir = "";
359 }
360
361 switch (uri->dtype) {
362 case LTTNG_DST_IPV4:
363 case LTTNG_DST_IPV6:
364 DBG2("Setting network URI to consumer");
365
366 /* Set URI into consumer output object */
367 ret = consumer_set_network_uri(consumer, uri);
368 if (ret < 0) {
f73fabfd 369 ret = LTTNG_ERR_FATAL;
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DG
370 goto error;
371 } else if (ret == 1) {
372 /*
373 * URI was the same in the consumer so we do not append the subdir
374 * again so to not duplicate output dir.
375 */
376 goto error;
377 }
378
379 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
380 ret = consumer_set_subdir(consumer, session_name);
381 if (ret < 0) {
f73fabfd 382 ret = LTTNG_ERR_FATAL;
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383 goto error;
384 }
385 }
386
387 if (uri->stype == LTTNG_STREAM_CONTROL) {
388 /* On a new subdir, reappend the default trace dir. */
c30ce0b3
CB
389 strncat(consumer->subdir, default_trace_dir,
390 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
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391 DBG3("Append domain trace name to subdir %s", consumer->subdir);
392 }
393
394 break;
395 case LTTNG_DST_PATH:
396 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
397 memset(consumer->dst.trace_path, 0,
398 sizeof(consumer->dst.trace_path));
399 strncpy(consumer->dst.trace_path, uri->dst.path,
400 sizeof(consumer->dst.trace_path));
401 /* Append default trace dir */
402 strncat(consumer->dst.trace_path, default_trace_dir,
c30ce0b3
CB
403 sizeof(consumer->dst.trace_path) -
404 strlen(consumer->dst.trace_path) - 1);
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405 /* Flag consumer as local. */
406 consumer->type = CONSUMER_DST_LOCAL;
407 break;
408 }
409
410error:
411 return ret;
412}
413
414/*
415 * Init tracing by creating trace directory and sending fds kernel consumer.
416 */
417static int init_kernel_tracing(struct ltt_kernel_session *session)
418{
419 int ret = 0;
420 struct lttng_ht_iter iter;
421 struct consumer_socket *socket;
422
423 assert(session);
424
425 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
426 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
427 socket, node.node) {
428 /* Code flow error */
429 assert(socket->fd >= 0);
430
431 pthread_mutex_lock(socket->lock);
432 ret = kernel_consumer_send_session(socket->fd, session);
433 pthread_mutex_unlock(socket->lock);
434 if (ret < 0) {
f73fabfd 435 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
436 goto error;
437 }
438 }
439 }
440
441error:
442 return ret;
443}
444
445/*
446 * Create a socket to the relayd using the URI.
447 *
448 * On success, the relayd_sock pointer is set to the created socket.
449 * Else, it's stays untouched and a lttcomm error code is returned.
450 */
451static int create_connect_relayd(struct consumer_output *output,
452 const char *session_name, struct lttng_uri *uri,
453 struct lttcomm_sock **relayd_sock)
454{
455 int ret;
456 struct lttcomm_sock *sock;
457
458 /* Create socket object from URI */
459 sock = lttcomm_alloc_sock_from_uri(uri);
460 if (sock == NULL) {
f73fabfd 461 ret = LTTNG_ERR_FATAL;
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DG
462 goto error;
463 }
464
465 ret = lttcomm_create_sock(sock);
466 if (ret < 0) {
f73fabfd 467 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
468 goto error;
469 }
470
471 /* Connect to relayd so we can proceed with a session creation. */
472 ret = relayd_connect(sock);
473 if (ret < 0) {
474 ERR("Unable to reach lttng-relayd");
f73fabfd 475 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
476 goto free_sock;
477 }
478
479 /* Create socket for control stream. */
480 if (uri->stype == LTTNG_STREAM_CONTROL) {
481 DBG3("Creating relayd stream socket from URI");
482
483 /* Check relayd version */
484 ret = relayd_version_check(sock, RELAYD_VERSION_COMM_MAJOR,
485 RELAYD_VERSION_COMM_MINOR);
486 if (ret < 0) {
f73fabfd 487 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
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DG
488 goto close_sock;
489 }
490 } else if (uri->stype == LTTNG_STREAM_DATA) {
491 DBG3("Creating relayd data socket from URI");
492 } else {
493 /* Command is not valid */
494 ERR("Relayd invalid stream type: %d", uri->stype);
f73fabfd 495 ret = LTTNG_ERR_INVALID;
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DG
496 goto close_sock;
497 }
498
499 *relayd_sock = sock;
500
f73fabfd 501 return LTTNG_OK;
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DG
502
503close_sock:
504 if (sock) {
505 (void) relayd_close(sock);
506 }
507free_sock:
508 if (sock) {
509 lttcomm_destroy_sock(sock);
510 }
511error:
512 return ret;
513}
514
515/*
516 * Connect to the relayd using URI and send the socket to the right consumer.
517 */
518static int send_consumer_relayd_socket(int domain, struct ltt_session *session,
519 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
520 int consumer_fd)
521{
522 int ret;
523 struct lttcomm_sock *sock = NULL;
524
525 /* Set the network sequence index if not set. */
526 if (consumer->net_seq_index == -1) {
527 /*
528 * Increment net_seq_idx because we are about to transfer the
529 * new relayd socket to the consumer.
530 */
531 uatomic_inc(&relayd_net_seq_idx);
532 /* Assign unique key so the consumer can match streams */
533 uatomic_set(&consumer->net_seq_index,
534 uatomic_read(&relayd_net_seq_idx));
535 }
536
537 /* Connect to relayd and make version check if uri is the control. */
538 ret = create_connect_relayd(consumer, session->name, relayd_uri, &sock);
f73fabfd 539 if (ret != LTTNG_OK) {
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540 goto close_sock;
541 }
542
543 /* If the control socket is connected, network session is ready */
544 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
545 session->net_handle = 1;
546 }
547
548 /* Send relayd socket to consumer. */
549 ret = consumer_send_relayd_socket(consumer_fd, sock,
550 consumer, relayd_uri->stype);
551 if (ret < 0) {
f73fabfd 552 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
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DG
553 goto close_sock;
554 }
555
c890b720
DG
556 /* Flag that the corresponding socket was sent. */
557 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
558 consumer->dst.net.control_sock_sent = 1;
559 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
560 consumer->dst.net.data_sock_sent = 1;
561 }
562
f73fabfd 563 ret = LTTNG_OK;
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DG
564
565 /*
566 * Close socket which was dup on the consumer side. The session daemon does
567 * NOT keep track of the relayd socket(s) once transfer to the consumer.
568 */
569
570close_sock:
571 if (sock) {
572 (void) relayd_close(sock);
573 lttcomm_destroy_sock(sock);
574 }
575
576 return ret;
577}
578
579/*
580 * Send both relayd sockets to a specific consumer and domain. This is a
581 * helper function to facilitate sending the information to the consumer for a
582 * session.
583 */
584static int send_consumer_relayd_sockets(int domain,
585 struct ltt_session *session, struct consumer_output *consumer, int fd)
586{
dda67f6c 587 int ret = LTTNG_OK;
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588
589 assert(session);
590 assert(consumer);
591
2f77fc4b 592 /* Sending control relayd socket. */
c890b720
DG
593 if (!consumer->dst.net.control_sock_sent) {
594 ret = send_consumer_relayd_socket(domain, session,
595 &consumer->dst.net.control, consumer, fd);
596 if (ret != LTTNG_OK) {
597 goto error;
598 }
2f77fc4b
DG
599 }
600
601 /* Sending data relayd socket. */
c890b720
DG
602 if (!consumer->dst.net.data_sock_sent) {
603 ret = send_consumer_relayd_socket(domain, session,
604 &consumer->dst.net.data, consumer, fd);
605 if (ret != LTTNG_OK) {
606 goto error;
607 }
2f77fc4b
DG
608 }
609
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610error:
611 return ret;
612}
613
614/*
615 * Setup relayd connections for a tracing session. First creates the socket to
616 * the relayd and send them to the right domain consumer. Consumer type MUST be
617 * network.
618 */
619static int setup_relayd(struct ltt_session *session)
620{
f73fabfd 621 int ret = LTTNG_OK;
2f77fc4b
DG
622 struct ltt_ust_session *usess;
623 struct ltt_kernel_session *ksess;
624 struct consumer_socket *socket;
625 struct lttng_ht_iter iter;
626
627 assert(session);
628
629 usess = session->ust_session;
630 ksess = session->kernel_session;
631
632 DBG2("Setting relayd for session %s", session->name);
633
634 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
635 && usess->consumer->enabled) {
636 /* For each consumer socket, send relayd sockets */
637 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
638 socket, node.node) {
639 /* Code flow error */
640 assert(socket->fd >= 0);
641
642 pthread_mutex_lock(socket->lock);
dda67f6c 643 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session,
2f77fc4b
DG
644 usess->consumer, socket->fd);
645 pthread_mutex_unlock(socket->lock);
f73fabfd 646 if (ret != LTTNG_OK) {
2f77fc4b
DG
647 goto error;
648 }
649 }
650 }
651
652 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
653 && ksess->consumer->enabled) {
654 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
655 socket, node.node) {
656 /* Code flow error */
657 assert(socket->fd >= 0);
658
659 pthread_mutex_lock(socket->lock);
dda67f6c 660 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session,
2f77fc4b
DG
661 ksess->consumer, socket->fd);
662 pthread_mutex_unlock(socket->lock);
f73fabfd 663 if (ret != LTTNG_OK) {
2f77fc4b
DG
664 goto error;
665 }
666 }
667 }
668
669error:
670 return ret;
671}
672
673/*
674 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
675 */
676int cmd_disable_channel(struct ltt_session *session, int domain,
677 char *channel_name)
678{
679 int ret;
680 struct ltt_ust_session *usess;
681
682 usess = session->ust_session;
683
684 switch (domain) {
685 case LTTNG_DOMAIN_KERNEL:
686 {
687 ret = channel_kernel_disable(session->kernel_session,
688 channel_name);
f73fabfd 689 if (ret != LTTNG_OK) {
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690 goto error;
691 }
692
693 kernel_wait_quiescent(kernel_tracer_fd);
694 break;
695 }
696 case LTTNG_DOMAIN_UST:
697 {
698 struct ltt_ust_channel *uchan;
699 struct lttng_ht *chan_ht;
700
701 chan_ht = usess->domain_global.channels;
702
703 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
704 if (uchan == NULL) {
f73fabfd 705 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
706 goto error;
707 }
708
709 ret = channel_ust_disable(usess, domain, uchan);
f73fabfd 710 if (ret != LTTNG_OK) {
2f77fc4b
DG
711 goto error;
712 }
713 break;
714 }
715#if 0
716 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
717 case LTTNG_DOMAIN_UST_EXEC_NAME:
718 case LTTNG_DOMAIN_UST_PID:
719#endif
720 default:
f73fabfd 721 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
722 goto error;
723 }
724
f73fabfd 725 ret = LTTNG_OK;
2f77fc4b
DG
726
727error:
728 return ret;
729}
730
731/*
732 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
733 *
734 * The wpipe arguments is used as a notifier for the kernel thread.
735 */
736int cmd_enable_channel(struct ltt_session *session,
737 int domain, struct lttng_channel *attr, int wpipe)
738{
739 int ret;
740 struct ltt_ust_session *usess = session->ust_session;
741 struct lttng_ht *chan_ht;
742
743 assert(session);
744 assert(attr);
745
746 DBG("Enabling channel %s for session %s", attr->name, session->name);
747
748 switch (domain) {
749 case LTTNG_DOMAIN_KERNEL:
750 {
751 struct ltt_kernel_channel *kchan;
752
753 /* Mandatory for a kernel channel. */
754 assert(wpipe > 0);
755
756 kchan = trace_kernel_get_channel_by_name(attr->name,
757 session->kernel_session);
758 if (kchan == NULL) {
759 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
760 } else {
761 ret = channel_kernel_enable(session->kernel_session, kchan);
762 }
763
f73fabfd 764 if (ret != LTTNG_OK) {
2f77fc4b
DG
765 goto error;
766 }
767
768 kernel_wait_quiescent(kernel_tracer_fd);
769 break;
770 }
771 case LTTNG_DOMAIN_UST:
772 {
773 struct ltt_ust_channel *uchan;
774
775 chan_ht = usess->domain_global.channels;
776
777 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
778 if (uchan == NULL) {
779 ret = channel_ust_create(usess, domain, attr);
780 } else {
781 ret = channel_ust_enable(usess, domain, uchan);
782 }
783 break;
784 }
785#if 0
786 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
787 case LTTNG_DOMAIN_UST_EXEC_NAME:
788 case LTTNG_DOMAIN_UST_PID:
789#endif
790 default:
f73fabfd 791 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
792 goto error;
793 }
794
795error:
796 return ret;
797}
798
799
800/*
801 * Command LTTNG_DISABLE_EVENT processed by the client thread.
802 */
803int cmd_disable_event(struct ltt_session *session, int domain,
804 char *channel_name, char *event_name)
805{
806 int ret;
807
808 switch (domain) {
809 case LTTNG_DOMAIN_KERNEL:
810 {
811 struct ltt_kernel_channel *kchan;
812 struct ltt_kernel_session *ksess;
813
814 ksess = session->kernel_session;
815
816 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
817 if (kchan == NULL) {
f73fabfd 818 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
819 goto error;
820 }
821
822 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
f73fabfd 823 if (ret != LTTNG_OK) {
2f77fc4b
DG
824 goto error;
825 }
826
827 kernel_wait_quiescent(kernel_tracer_fd);
828 break;
829 }
830 case LTTNG_DOMAIN_UST:
831 {
832 struct ltt_ust_channel *uchan;
833 struct ltt_ust_session *usess;
834
835 usess = session->ust_session;
836
837 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
838 channel_name);
839 if (uchan == NULL) {
f73fabfd 840 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
841 goto error;
842 }
843
844 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
f73fabfd 845 if (ret != LTTNG_OK) {
2f77fc4b
DG
846 goto error;
847 }
848
849 DBG3("Disable UST event %s in channel %s completed", event_name,
850 channel_name);
851 break;
852 }
853#if 0
854 case LTTNG_DOMAIN_UST_EXEC_NAME:
855 case LTTNG_DOMAIN_UST_PID:
856 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
857#endif
858 default:
f73fabfd 859 ret = LTTNG_ERR_UND;
2f77fc4b
DG
860 goto error;
861 }
862
f73fabfd 863 ret = LTTNG_OK;
2f77fc4b
DG
864
865error:
866 return ret;
867}
868
869/*
870 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
871 */
872int cmd_disable_event_all(struct ltt_session *session, int domain,
873 char *channel_name)
874{
875 int ret;
876
877 switch (domain) {
878 case LTTNG_DOMAIN_KERNEL:
879 {
880 struct ltt_kernel_session *ksess;
881 struct ltt_kernel_channel *kchan;
882
883 ksess = session->kernel_session;
884
885 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
886 if (kchan == NULL) {
f73fabfd 887 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
888 goto error;
889 }
890
891 ret = event_kernel_disable_all(ksess, kchan);
f73fabfd 892 if (ret != LTTNG_OK) {
2f77fc4b
DG
893 goto error;
894 }
895
896 kernel_wait_quiescent(kernel_tracer_fd);
897 break;
898 }
899 case LTTNG_DOMAIN_UST:
900 {
901 struct ltt_ust_session *usess;
902 struct ltt_ust_channel *uchan;
903
904 usess = session->ust_session;
905
906 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
907 channel_name);
908 if (uchan == NULL) {
f73fabfd 909 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
910 goto error;
911 }
912
913 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
914 if (ret != 0) {
915 goto error;
916 }
917
918 DBG3("Disable all UST events in channel %s completed", channel_name);
919
920 break;
921 }
922#if 0
923 case LTTNG_DOMAIN_UST_EXEC_NAME:
924 case LTTNG_DOMAIN_UST_PID:
925 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
926#endif
927 default:
f73fabfd 928 ret = LTTNG_ERR_UND;
2f77fc4b
DG
929 goto error;
930 }
931
f73fabfd 932 ret = LTTNG_OK;
2f77fc4b
DG
933
934error:
935 return ret;
936}
937
938/*
939 * Command LTTNG_ADD_CONTEXT processed by the client thread.
940 */
941int cmd_add_context(struct ltt_session *session, int domain,
979e618e
DG
942 char *channel_name, char *event_name, struct lttng_event_context *ctx,
943 int kwpipe)
2f77fc4b
DG
944{
945 int ret;
946
947 switch (domain) {
948 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
949 assert(session->kernel_session);
950
951 if (session->kernel_session->channel_count == 0) {
952 /* Create default channel */
953 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
954 if (ret != LTTNG_OK) {
955 goto error;
956 }
957 }
958
2f77fc4b
DG
959 /* Add kernel context to kernel tracer */
960 ret = context_kernel_add(session->kernel_session, ctx,
961 event_name, channel_name);
f73fabfd 962 if (ret != LTTNG_OK) {
2f77fc4b
DG
963 goto error;
964 }
965 break;
966 case LTTNG_DOMAIN_UST:
967 {
968 struct ltt_ust_session *usess = session->ust_session;
2f77fc4b
DG
969 assert(usess);
970
979e618e
DG
971 unsigned int chan_count =
972 lttng_ht_get_count(usess->domain_global.channels);
973 if (chan_count == 0) {
974 struct lttng_channel *attr;
975 /* Create default channel */
976 attr = channel_new_default_attr(domain);
977 if (attr == NULL) {
978 ret = LTTNG_ERR_FATAL;
979 goto error;
980 }
981
982 ret = channel_ust_create(usess, domain, attr);
983 if (ret != LTTNG_OK) {
984 free(attr);
985 goto error;
986 }
987 free(attr);
988 }
989
990
2f77fc4b 991 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
f73fabfd 992 if (ret != LTTNG_OK) {
2f77fc4b
DG
993 goto error;
994 }
995 break;
996 }
997#if 0
998 case LTTNG_DOMAIN_UST_EXEC_NAME:
999 case LTTNG_DOMAIN_UST_PID:
1000 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1001#endif
1002 default:
f73fabfd 1003 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1004 goto error;
1005 }
1006
f73fabfd 1007 ret = LTTNG_OK;
2f77fc4b
DG
1008
1009error:
1010 return ret;
1011}
1012
1013/*
1014 * Command LTTNG_SET_FILTER processed by the client thread.
1015 */
1016int cmd_set_filter(struct ltt_session *session, int domain,
1017 char *channel_name, char *event_name,
1018 struct lttng_filter_bytecode *bytecode)
1019{
1020 int ret;
1021
1022 switch (domain) {
1023 case LTTNG_DOMAIN_KERNEL:
f73fabfd 1024 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1025 break;
1026 case LTTNG_DOMAIN_UST:
1027 {
1028 struct ltt_ust_session *usess = session->ust_session;
1029
1030 ret = filter_ust_set(usess, domain, bytecode, event_name, channel_name);
f73fabfd 1031 if (ret != LTTNG_OK) {
2f77fc4b
DG
1032 goto error;
1033 }
1034 break;
1035 }
1036#if 0
1037 case LTTNG_DOMAIN_UST_EXEC_NAME:
1038 case LTTNG_DOMAIN_UST_PID:
1039 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1040#endif
1041 default:
f73fabfd 1042 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1043 goto error;
1044 }
1045
f73fabfd 1046 ret = LTTNG_OK;
2f77fc4b
DG
1047
1048error:
1049 return ret;
1050
1051}
1052
1053
1054/*
1055 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1056 */
1057int cmd_enable_event(struct ltt_session *session, int domain,
1058 char *channel_name, struct lttng_event *event, int wpipe)
1059{
1060 int ret;
1061 struct lttng_channel *attr;
1062
1063 assert(session);
1064 assert(event);
1065 assert(channel_name);
1066
1067 switch (domain) {
1068 case LTTNG_DOMAIN_KERNEL:
1069 {
1070 struct ltt_kernel_channel *kchan;
1071
1072 kchan = trace_kernel_get_channel_by_name(channel_name,
1073 session->kernel_session);
1074 if (kchan == NULL) {
1075 attr = channel_new_default_attr(domain);
1076 if (attr == NULL) {
f73fabfd 1077 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1078 goto error;
1079 }
1080 strncpy(attr->name, channel_name, sizeof(attr->name));
1081
1082 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1083 if (ret != LTTNG_OK) {
2f77fc4b
DG
1084 free(attr);
1085 goto error;
1086 }
1087 free(attr);
1088 }
1089
1090 /* Get the newly created kernel channel pointer */
1091 kchan = trace_kernel_get_channel_by_name(channel_name,
1092 session->kernel_session);
1093 if (kchan == NULL) {
1094 /* This sould not happen... */
f73fabfd 1095 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1096 goto error;
1097 }
1098
1099 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
1100 event);
f73fabfd 1101 if (ret != LTTNG_OK) {
2f77fc4b
DG
1102 goto error;
1103 }
1104
1105 kernel_wait_quiescent(kernel_tracer_fd);
1106 break;
1107 }
1108 case LTTNG_DOMAIN_UST:
1109 {
1110 struct ltt_ust_channel *uchan;
1111 struct ltt_ust_session *usess = session->ust_session;
1112
1113 assert(usess);
1114
1115 /* Get channel from global UST domain */
1116 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1117 channel_name);
1118 if (uchan == NULL) {
1119 /* Create default channel */
1120 attr = channel_new_default_attr(domain);
1121 if (attr == NULL) {
f73fabfd 1122 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1123 goto error;
1124 }
1125 strncpy(attr->name, channel_name, sizeof(attr->name));
1126
1127 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1128 if (ret != LTTNG_OK) {
2f77fc4b
DG
1129 free(attr);
1130 goto error;
1131 }
1132 free(attr);
1133
1134 /* Get the newly created channel reference back */
1135 uchan = trace_ust_find_channel_by_name(
1136 usess->domain_global.channels, channel_name);
1137 assert(uchan);
1138 }
1139
1140 /* At this point, the session and channel exist on the tracer */
1141 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
f73fabfd 1142 if (ret != LTTNG_OK) {
2f77fc4b
DG
1143 goto error;
1144 }
1145 break;
1146 }
1147#if 0
1148 case LTTNG_DOMAIN_UST_EXEC_NAME:
1149 case LTTNG_DOMAIN_UST_PID:
1150 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1151#endif
1152 default:
f73fabfd 1153 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1154 goto error;
1155 }
1156
f73fabfd 1157 ret = LTTNG_OK;
2f77fc4b
DG
1158
1159error:
1160 return ret;
1161}
1162
1163/*
1164 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1165 */
1166int cmd_enable_event_all(struct ltt_session *session, int domain,
1167 char *channel_name, int event_type, int wpipe)
1168{
1169 int ret;
1170 struct lttng_channel *attr;
1171
1172 assert(session);
1173 assert(channel_name);
1174
1175 switch (domain) {
1176 case LTTNG_DOMAIN_KERNEL:
1177 {
1178 struct ltt_kernel_channel *kchan;
1179
1180 assert(session->kernel_session);
1181
1182 kchan = trace_kernel_get_channel_by_name(channel_name,
1183 session->kernel_session);
1184 if (kchan == NULL) {
1185 /* Create default channel */
1186 attr = channel_new_default_attr(domain);
1187 if (attr == NULL) {
f73fabfd 1188 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1189 goto error;
1190 }
1191 strncpy(attr->name, channel_name, sizeof(attr->name));
1192
1193 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1194 if (ret != LTTNG_OK) {
2f77fc4b
DG
1195 free(attr);
1196 goto error;
1197 }
1198 free(attr);
1199
1200 /* Get the newly created kernel channel pointer */
1201 kchan = trace_kernel_get_channel_by_name(channel_name,
1202 session->kernel_session);
1203 assert(kchan);
1204 }
1205
1206 switch (event_type) {
1207 case LTTNG_EVENT_SYSCALL:
1208 ret = event_kernel_enable_all_syscalls(session->kernel_session,
1209 kchan, kernel_tracer_fd);
1210 break;
1211 case LTTNG_EVENT_TRACEPOINT:
1212 /*
1213 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1214 * events already registered to the channel.
1215 */
1216 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
1217 kchan, kernel_tracer_fd);
1218 break;
1219 case LTTNG_EVENT_ALL:
1220 /* Enable syscalls and tracepoints */
1221 ret = event_kernel_enable_all(session->kernel_session,
1222 kchan, kernel_tracer_fd);
1223 break;
1224 default:
f73fabfd 1225 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2f77fc4b
DG
1226 goto error;
1227 }
1228
1229 /* Manage return value */
f73fabfd 1230 if (ret != LTTNG_OK) {
2f77fc4b
DG
1231 goto error;
1232 }
1233
1234 kernel_wait_quiescent(kernel_tracer_fd);
1235 break;
1236 }
1237 case LTTNG_DOMAIN_UST:
1238 {
1239 struct ltt_ust_channel *uchan;
1240 struct ltt_ust_session *usess = session->ust_session;
1241
1242 assert(usess);
1243
1244 /* Get channel from global UST domain */
1245 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1246 channel_name);
1247 if (uchan == NULL) {
1248 /* Create default channel */
1249 attr = channel_new_default_attr(domain);
1250 if (attr == NULL) {
f73fabfd 1251 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1252 goto error;
1253 }
1254 strncpy(attr->name, channel_name, sizeof(attr->name));
1255
1256 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1257 if (ret != LTTNG_OK) {
2f77fc4b
DG
1258 free(attr);
1259 goto error;
1260 }
1261 free(attr);
1262
1263 /* Get the newly created channel reference back */
1264 uchan = trace_ust_find_channel_by_name(
1265 usess->domain_global.channels, channel_name);
1266 assert(uchan);
1267 }
1268
1269 /* At this point, the session and channel exist on the tracer */
1270
1271 switch (event_type) {
1272 case LTTNG_EVENT_ALL:
1273 case LTTNG_EVENT_TRACEPOINT:
1274 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
f73fabfd 1275 if (ret != LTTNG_OK) {
2f77fc4b
DG
1276 goto error;
1277 }
1278 break;
1279 default:
f73fabfd 1280 ret = LTTNG_ERR_UST_ENABLE_FAIL;
2f77fc4b
DG
1281 goto error;
1282 }
1283
1284 /* Manage return value */
f73fabfd 1285 if (ret != LTTNG_OK) {
2f77fc4b
DG
1286 goto error;
1287 }
1288
1289 break;
1290 }
1291#if 0
1292 case LTTNG_DOMAIN_UST_EXEC_NAME:
1293 case LTTNG_DOMAIN_UST_PID:
1294 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1295#endif
1296 default:
f73fabfd 1297 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1298 goto error;
1299 }
1300
f73fabfd 1301 ret = LTTNG_OK;
2f77fc4b
DG
1302
1303error:
1304 return ret;
1305}
1306
1307
1308/*
1309 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1310 */
1311ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1312{
1313 int ret;
1314 ssize_t nb_events = 0;
1315
1316 switch (domain) {
1317 case LTTNG_DOMAIN_KERNEL:
1318 nb_events = kernel_list_events(kernel_tracer_fd, events);
1319 if (nb_events < 0) {
f73fabfd 1320 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
1321 goto error;
1322 }
1323 break;
1324 case LTTNG_DOMAIN_UST:
1325 nb_events = ust_app_list_events(events);
1326 if (nb_events < 0) {
f73fabfd 1327 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
1328 goto error;
1329 }
1330 break;
1331 default:
f73fabfd 1332 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1333 goto error;
1334 }
1335
1336 return nb_events;
1337
1338error:
1339 /* Return negative value to differentiate return code */
1340 return -ret;
1341}
1342
1343/*
1344 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1345 */
1346ssize_t cmd_list_tracepoint_fields(int domain,
1347 struct lttng_event_field **fields)
1348{
1349 int ret;
1350 ssize_t nb_fields = 0;
1351
1352 switch (domain) {
1353 case LTTNG_DOMAIN_UST:
1354 nb_fields = ust_app_list_event_fields(fields);
1355 if (nb_fields < 0) {
f73fabfd 1356 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
1357 goto error;
1358 }
1359 break;
1360 case LTTNG_DOMAIN_KERNEL:
1361 default: /* fall-through */
f73fabfd 1362 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1363 goto error;
1364 }
1365
1366 return nb_fields;
1367
1368error:
1369 /* Return negative value to differentiate return code */
1370 return -ret;
1371}
1372
1373/*
1374 * Command LTTNG_START_TRACE processed by the client thread.
1375 */
1376int cmd_start_trace(struct ltt_session *session)
1377{
1378 int ret;
1379 struct ltt_kernel_session *ksession;
1380 struct ltt_ust_session *usess;
1381 struct ltt_kernel_channel *kchan;
1382
1383 assert(session);
1384
1385 /* Ease our life a bit ;) */
1386 ksession = session->kernel_session;
1387 usess = session->ust_session;
1388
1389 if (session->enabled) {
1390 /* Already started. */
f73fabfd 1391 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
1392 goto error;
1393 }
1394
1395 session->enabled = 1;
1396
1397 ret = setup_relayd(session);
f73fabfd 1398 if (ret != LTTNG_OK) {
2f77fc4b
DG
1399 ERR("Error setting up relayd for session %s", session->name);
1400 goto error;
1401 }
1402
1403 /* Kernel tracing */
1404 if (ksession != NULL) {
1405 /* Open kernel metadata */
1406 if (ksession->metadata == NULL) {
1407 ret = kernel_open_metadata(ksession);
1408 if (ret < 0) {
f73fabfd 1409 ret = LTTNG_ERR_KERN_META_FAIL;
2f77fc4b
DG
1410 goto error;
1411 }
1412 }
1413
1414 /* Open kernel metadata stream */
1415 if (ksession->metadata_stream_fd < 0) {
1416 ret = kernel_open_metadata_stream(ksession);
1417 if (ret < 0) {
1418 ERR("Kernel create metadata stream failed");
f73fabfd 1419 ret = LTTNG_ERR_KERN_STREAM_FAIL;
2f77fc4b
DG
1420 goto error;
1421 }
1422 }
1423
1424 /* For each channel */
1425 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1426 if (kchan->stream_count == 0) {
1427 ret = kernel_open_channel_stream(kchan);
1428 if (ret < 0) {
f73fabfd 1429 ret = LTTNG_ERR_KERN_STREAM_FAIL;
2f77fc4b
DG
1430 goto error;
1431 }
1432 /* Update the stream global counter */
1433 ksession->stream_count_global += ret;
1434 }
1435 }
1436
1437 /* Setup kernel consumer socket and send fds to it */
1438 ret = init_kernel_tracing(ksession);
1439 if (ret < 0) {
f73fabfd 1440 ret = LTTNG_ERR_KERN_START_FAIL;
2f77fc4b
DG
1441 goto error;
1442 }
1443
1444 /* This start the kernel tracing */
1445 ret = kernel_start_session(ksession);
1446 if (ret < 0) {
f73fabfd 1447 ret = LTTNG_ERR_KERN_START_FAIL;
2f77fc4b
DG
1448 goto error;
1449 }
1450
1451 /* Quiescent wait after starting trace */
1452 kernel_wait_quiescent(kernel_tracer_fd);
1453 }
1454
1455 /* Flag session that trace should start automatically */
1456 if (usess) {
1457 usess->start_trace = 1;
1458
1459 ret = ust_app_start_trace_all(usess);
1460 if (ret < 0) {
f73fabfd 1461 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
1462 goto error;
1463 }
1464 }
1465
f73fabfd 1466 ret = LTTNG_OK;
2f77fc4b
DG
1467
1468error:
1469 return ret;
1470}
1471
1472/*
1473 * Command LTTNG_STOP_TRACE processed by the client thread.
1474 */
1475int cmd_stop_trace(struct ltt_session *session)
1476{
1477 int ret;
1478 struct ltt_kernel_channel *kchan;
1479 struct ltt_kernel_session *ksession;
1480 struct ltt_ust_session *usess;
1481
1482 assert(session);
1483
1484 /* Short cut */
1485 ksession = session->kernel_session;
1486 usess = session->ust_session;
1487
1488 if (!session->enabled) {
f73fabfd 1489 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
1490 goto error;
1491 }
1492
1493 session->enabled = 0;
1494
1495 /* Kernel tracer */
1496 if (ksession) {
1497 DBG("Stop kernel tracing");
1498
1499 /* Flush metadata if exist */
1500 if (ksession->metadata_stream_fd >= 0) {
1501 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1502 if (ret < 0) {
1503 ERR("Kernel metadata flush failed");
1504 }
1505 }
1506
1507 /* Flush all buffers before stopping */
1508 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1509 ret = kernel_flush_buffer(kchan);
1510 if (ret < 0) {
1511 ERR("Kernel flush buffer error");
1512 }
1513 }
1514
1515 ret = kernel_stop_session(ksession);
1516 if (ret < 0) {
f73fabfd 1517 ret = LTTNG_ERR_KERN_STOP_FAIL;
2f77fc4b
DG
1518 goto error;
1519 }
1520
1521 kernel_wait_quiescent(kernel_tracer_fd);
1522 }
1523
1524 if (usess) {
1525 usess->start_trace = 0;
1526
1527 ret = ust_app_stop_trace_all(usess);
1528 if (ret < 0) {
f73fabfd 1529 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
1530 goto error;
1531 }
1532 }
1533
f73fabfd 1534 ret = LTTNG_OK;
2f77fc4b
DG
1535
1536error:
1537 return ret;
1538}
1539
1540/*
1541 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1542 */
1543int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1544 size_t nb_uri, struct lttng_uri *uris)
1545{
1546 int ret, i;
1547 struct ltt_kernel_session *ksess = session->kernel_session;
1548 struct ltt_ust_session *usess = session->ust_session;
1549 struct consumer_output *consumer = NULL;
1550
1551 assert(session);
1552 assert(uris);
1553 assert(nb_uri > 0);
1554
1555 /* Can't enable consumer after session started. */
1556 if (session->enabled) {
f73fabfd 1557 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
1558 goto error;
1559 }
1560
2f77fc4b
DG
1561 /*
1562 * This case switch makes sure the domain session has a temporary consumer
1563 * so the URL can be set.
1564 */
1565 switch (domain) {
1566 case 0:
1567 /* Code flow error. A session MUST always have a consumer object */
1568 assert(session->consumer);
1569 /*
1570 * The URL will be added to the tracing session consumer instead of a
1571 * specific domain consumer.
1572 */
1573 consumer = session->consumer;
1574 break;
1575 case LTTNG_DOMAIN_KERNEL:
1576 /* Code flow error if we don't have a kernel session here. */
1577 assert(ksess);
1578
1579 /* Create consumer output if none exists */
1580 consumer = ksess->tmp_consumer;
1581 if (consumer == NULL) {
1582 consumer = consumer_copy_output(ksess->consumer);
1583 if (consumer == NULL) {
f73fabfd 1584 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1585 goto error;
1586 }
1587 /* Trash the consumer subdir, we are about to set a new one. */
1588 memset(consumer->subdir, 0, sizeof(consumer->subdir));
1589 ksess->tmp_consumer = consumer;
1590 }
1591
1592 break;
1593 case LTTNG_DOMAIN_UST:
1594 /* Code flow error if we don't have a kernel session here. */
1595 assert(usess);
1596
1597 /* Create consumer output if none exists */
1598 consumer = usess->tmp_consumer;
1599 if (consumer == NULL) {
1600 consumer = consumer_copy_output(usess->consumer);
1601 if (consumer == NULL) {
f73fabfd 1602 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1603 goto error;
1604 }
1605 /* Trash the consumer subdir, we are about to set a new one. */
1606 memset(consumer->subdir, 0, sizeof(consumer->subdir));
1607 usess->tmp_consumer = consumer;
1608 }
1609
1610 break;
1611 }
1612
1613 for (i = 0; i < nb_uri; i++) {
1614 struct consumer_socket *socket;
1615 struct lttng_ht_iter iter;
1616
1617 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1618 if (ret < 0) {
1619 goto error;
1620 }
1621
1622 /*
1623 * Don't send relayd socket if URI is NOT remote or if the relayd
c890b720 1624 * socket for the session was already sent.
2f77fc4b
DG
1625 */
1626 if (uris[i].dtype == LTTNG_DST_PATH ||
c890b720
DG
1627 (uris[i].stype == LTTNG_STREAM_CONTROL &&
1628 consumer->dst.net.control_sock_sent) ||
1629 (uris[i].stype == LTTNG_STREAM_DATA &&
1630 consumer->dst.net.data_sock_sent)) {
2f77fc4b
DG
1631 continue;
1632 }
1633
1634 /* Try to send relayd URI to the consumer if exist. */
1635 rcu_read_lock();
1636 cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter,
1637 socket, node.node) {
1638
1639 /* A socket in the HT should never have a negative fd */
1640 assert(socket->fd >= 0);
1641
1642 pthread_mutex_lock(socket->lock);
1643 ret = send_consumer_relayd_socket(domain, session, &uris[i],
1644 consumer, socket->fd);
1645 pthread_mutex_unlock(socket->lock);
f73fabfd 1646 if (ret != LTTNG_OK) {
2f77fc4b
DG
1647 rcu_read_unlock();
1648 goto error;
1649 }
1650 }
1651 rcu_read_unlock();
1652 }
1653
1654 /* All good! */
f73fabfd 1655 ret = LTTNG_OK;
2f77fc4b
DG
1656
1657error:
1658 return ret;
1659}
1660
1661/*
1662 * Command LTTNG_CREATE_SESSION processed by the client thread.
1663 */
1664int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1665 size_t nb_uri, lttng_sock_cred *creds)
1666{
1667 int ret;
1668 char *path = NULL;
1669 struct ltt_session *session;
1670
1671 assert(name);
1672
1673 /*
1674 * Verify if the session already exist
1675 *
1676 * XXX: There is no need for the session lock list here since the caller
1677 * (process_client_msg) is holding it. We might want to change that so a
1678 * single command does not lock the entire session list.
1679 */
1680 session = session_find_by_name(name);
1681 if (session != NULL) {
f73fabfd 1682 ret = LTTNG_ERR_EXIST_SESS;
2f77fc4b
DG
1683 goto find_error;
1684 }
1685
1686 /* Create tracing session in the registry */
1687 ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
1688 LTTNG_SOCK_GET_GID_CRED(creds));
f73fabfd 1689 if (ret != LTTNG_OK) {
2f77fc4b
DG
1690 goto session_error;
1691 }
1692
1693 /*
1694 * Get the newly created session pointer back
1695 *
1696 * XXX: There is no need for the session lock list here since the caller
1697 * (process_client_msg) is holding it. We might want to change that so a
1698 * single command does not lock the entire session list.
1699 */
1700 session = session_find_by_name(name);
1701 assert(session);
1702
1703 /* Create default consumer output for the session not yet created. */
1704 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1705 if (session->consumer == NULL) {
f73fabfd 1706 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1707 goto consumer_error;
1708 }
1709
1710 /*
1711 * This means that the lttng_create_session call was called with the _path_
1712 * argument set to NULL.
1713 */
1714 if (uris == NULL) {
1715 /*
1716 * At this point, we'll skip the consumer URI setup and create a
1717 * session with a NULL path which will flag the session to NOT spawn a
1718 * consumer.
1719 */
1720 DBG("Create session %s with NO uri, skipping consumer setup", name);
1721 goto end;
1722 }
1723
1724 session->start_consumer = 1;
1725
1726 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
f73fabfd 1727 if (ret != LTTNG_OK) {
2f77fc4b
DG
1728 goto consumer_error;
1729 }
1730
1731 session->consumer->enabled = 1;
1732
1733end:
f73fabfd 1734 return LTTNG_OK;
2f77fc4b
DG
1735
1736consumer_error:
1737 session_destroy(session);
1738session_error:
1739find_error:
1740 return ret;
1741}
1742
1743/*
1744 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1745 */
1746int cmd_destroy_session(struct ltt_session *session, int wpipe)
1747{
1748 int ret;
1749 struct ltt_ust_session *usess;
1750 struct ltt_kernel_session *ksess;
1751
1752 /* Safety net */
1753 assert(session);
1754
1755 usess = session->ust_session;
1756 ksess = session->kernel_session;
1757
1758 /* Clean kernel session teardown */
1759 kernel_destroy_session(ksess);
1760
1761 /* UST session teardown */
1762 if (usess) {
1763 /* Close any relayd session */
1764 consumer_output_send_destroy_relayd(usess->consumer);
1765
1766 /* Destroy every UST application related to this session. */
1767 ret = ust_app_destroy_trace_all(usess);
1768 if (ret) {
1769 ERR("Error in ust_app_destroy_trace_all");
1770 }
1771
1772 /* Clean up the rest. */
1773 trace_ust_destroy_session(usess);
1774 }
1775
1776 /*
1777 * Must notify the kernel thread here to update it's poll set in order to
1778 * remove the channel(s)' fd just destroyed.
1779 */
1780 ret = notify_thread_pipe(wpipe);
1781 if (ret < 0) {
1782 PERROR("write kernel poll pipe");
1783 }
1784
1785 ret = session_destroy(session);
1786
1787 return ret;
1788}
1789
1790/*
1791 * Command LTTNG_CALIBRATE processed by the client thread.
1792 */
1793int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
1794{
1795 int ret;
1796
1797 switch (domain) {
1798 case LTTNG_DOMAIN_KERNEL:
1799 {
1800 struct lttng_kernel_calibrate kcalibrate;
1801
1802 kcalibrate.type = calibrate->type;
1803 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
1804 if (ret < 0) {
f73fabfd 1805 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2f77fc4b
DG
1806 goto error;
1807 }
1808 break;
1809 }
1810 case LTTNG_DOMAIN_UST:
1811 {
1812 struct lttng_ust_calibrate ucalibrate;
1813
1814 ucalibrate.type = calibrate->type;
1815 ret = ust_app_calibrate_glb(&ucalibrate);
1816 if (ret < 0) {
f73fabfd 1817 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2f77fc4b
DG
1818 goto error;
1819 }
1820 break;
1821 }
1822 default:
f73fabfd 1823 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1824 goto error;
1825 }
1826
f73fabfd 1827 ret = LTTNG_OK;
2f77fc4b
DG
1828
1829error:
1830 return ret;
1831}
1832
1833/*
1834 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1835 */
1836int cmd_register_consumer(struct ltt_session *session, int domain,
1837 const char *sock_path, struct consumer_data *cdata)
1838{
1839 int ret, sock;
1840 struct consumer_socket *socket;
1841
1842 assert(session);
1843 assert(cdata);
1844 assert(sock_path);
1845
1846 switch (domain) {
1847 case LTTNG_DOMAIN_KERNEL:
1848 {
1849 struct ltt_kernel_session *ksess = session->kernel_session;
1850
1851 assert(ksess);
1852
1853 /* Can't register a consumer if there is already one */
1854 if (ksess->consumer_fds_sent != 0) {
f73fabfd 1855 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
1856 goto error;
1857 }
1858
1859 sock = lttcomm_connect_unix_sock(sock_path);
1860 if (sock < 0) {
f73fabfd 1861 ret = LTTNG_ERR_CONNECT_FAIL;
2f77fc4b
DG
1862 goto error;
1863 }
1864
1865 socket = consumer_allocate_socket(sock);
1866 if (socket == NULL) {
f73fabfd 1867 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1868 close(sock);
1869 goto error;
1870 }
1871
1872 socket->lock = zmalloc(sizeof(pthread_mutex_t));
1873 if (socket->lock == NULL) {
1874 PERROR("zmalloc pthread mutex");
f73fabfd 1875 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1876 goto error;
1877 }
1878 pthread_mutex_init(socket->lock, NULL);
1879 socket->registered = 1;
1880
1881 rcu_read_lock();
1882 consumer_add_socket(socket, ksess->consumer);
1883 rcu_read_unlock();
1884
1885 pthread_mutex_lock(&cdata->pid_mutex);
1886 cdata->pid = -1;
1887 pthread_mutex_unlock(&cdata->pid_mutex);
1888
1889 break;
1890 }
1891 default:
1892 /* TODO: Userspace tracing */
f73fabfd 1893 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1894 goto error;
1895 }
1896
f73fabfd 1897 ret = LTTNG_OK;
2f77fc4b
DG
1898
1899error:
1900 return ret;
1901}
1902
1903/*
1904 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1905 */
1906ssize_t cmd_list_domains(struct ltt_session *session,
1907 struct lttng_domain **domains)
1908{
1909 int ret, index = 0;
1910 ssize_t nb_dom = 0;
1911
1912 if (session->kernel_session != NULL) {
1913 DBG3("Listing domains found kernel domain");
1914 nb_dom++;
1915 }
1916
1917 if (session->ust_session != NULL) {
1918 DBG3("Listing domains found UST global domain");
1919 nb_dom++;
1920 }
1921
1922 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
1923 if (*domains == NULL) {
f73fabfd 1924 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1925 goto error;
1926 }
1927
1928 if (session->kernel_session != NULL) {
1929 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
1930 index++;
1931 }
1932
1933 if (session->ust_session != NULL) {
1934 (*domains)[index].type = LTTNG_DOMAIN_UST;
1935 index++;
1936 }
1937
1938 return nb_dom;
1939
1940error:
f73fabfd
DG
1941 /* Return negative value to differentiate return code */
1942 return -ret;
2f77fc4b
DG
1943}
1944
1945
1946/*
1947 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1948 */
1949ssize_t cmd_list_channels(int domain, struct ltt_session *session,
1950 struct lttng_channel **channels)
1951{
1952 int ret;
1953 ssize_t nb_chan = 0;
1954
1955 switch (domain) {
1956 case LTTNG_DOMAIN_KERNEL:
1957 if (session->kernel_session != NULL) {
1958 nb_chan = session->kernel_session->channel_count;
1959 }
1960 DBG3("Number of kernel channels %zd", nb_chan);
c7d620a2
DG
1961 if (nb_chan <= 0) {
1962 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1963 }
2f77fc4b
DG
1964 break;
1965 case LTTNG_DOMAIN_UST:
1966 if (session->ust_session != NULL) {
1967 nb_chan = lttng_ht_get_count(
1968 session->ust_session->domain_global.channels);
1969 }
1970 DBG3("Number of UST global channels %zd", nb_chan);
c7d620a2
DG
1971 if (nb_chan <= 0) {
1972 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1973 }
2f77fc4b
DG
1974 break;
1975 default:
1976 *channels = NULL;
f73fabfd 1977 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1978 goto error;
1979 }
1980
1981 if (nb_chan > 0) {
1982 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
1983 if (*channels == NULL) {
f73fabfd 1984 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1985 goto error;
1986 }
1987
1988 list_lttng_channels(domain, session, *channels);
1989 } else {
1990 *channels = NULL;
c7d620a2
DG
1991 /* Ret value was set in the domain switch case */
1992 goto error;
2f77fc4b
DG
1993 }
1994
1995 return nb_chan;
1996
1997error:
f73fabfd
DG
1998 /* Return negative value to differentiate return code */
1999 return -ret;
2f77fc4b
DG
2000}
2001
2002/*
2003 * Command LTTNG_LIST_EVENTS processed by the client thread.
2004 */
2005ssize_t cmd_list_events(int domain, struct ltt_session *session,
2006 char *channel_name, struct lttng_event **events)
2007{
2008 int ret = 0;
2009 ssize_t nb_event = 0;
2010
2011 switch (domain) {
2012 case LTTNG_DOMAIN_KERNEL:
2013 if (session->kernel_session != NULL) {
2014 nb_event = list_lttng_kernel_events(channel_name,
2015 session->kernel_session, events);
2016 }
2017 break;
2018 case LTTNG_DOMAIN_UST:
2019 {
2020 if (session->ust_session != NULL) {
2021 nb_event = list_lttng_ust_global_events(channel_name,
2022 &session->ust_session->domain_global, events);
2023 }
2024 break;
2025 }
2026 default:
f73fabfd 2027 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2028 goto error;
2029 }
2030
f73fabfd 2031 return nb_event;
2f77fc4b
DG
2032
2033error:
f73fabfd
DG
2034 /* Return negative value to differentiate return code */
2035 return -ret;
2f77fc4b
DG
2036}
2037
2038/*
2039 * Using the session list, filled a lttng_session array to send back to the
2040 * client for session listing.
2041 *
2042 * The session list lock MUST be acquired before calling this function. Use
2043 * session_lock_list() and session_unlock_list().
2044 */
2045void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2046 gid_t gid)
2047{
2048 int ret;
2049 unsigned int i = 0;
2050 struct ltt_session *session;
2051 struct ltt_session_list *list = session_get_list();
2052
2053 DBG("Getting all available session for UID %d GID %d",
2054 uid, gid);
2055 /*
2056 * Iterate over session list and append data after the control struct in
2057 * the buffer.
2058 */
2059 cds_list_for_each_entry(session, &list->head, list) {
2060 /*
2061 * Only list the sessions the user can control.
2062 */
2063 if (!session_access_ok(session, uid, gid)) {
2064 continue;
2065 }
2066
2067 struct ltt_kernel_session *ksess = session->kernel_session;
2068 struct ltt_ust_session *usess = session->ust_session;
2069
2070 if (session->consumer->type == CONSUMER_DST_NET ||
2071 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2072 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2073 ret = build_network_session_path(sessions[i].path,
2074 sizeof(session[i].path), session);
2075 } else {
2076 ret = snprintf(sessions[i].path, sizeof(session[i].path), "%s",
2077 session->consumer->dst.trace_path);
2078 }
2079 if (ret < 0) {
2080 PERROR("snprintf session path");
2081 continue;
2082 }
2083
2084 strncpy(sessions[i].name, session->name, NAME_MAX);
2085 sessions[i].name[NAME_MAX - 1] = '\0';
2086 sessions[i].enabled = session->enabled;
2087 i++;
2088 }
2089}
2090
2091/*
2092 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2093 */
2094int cmd_disable_consumer(int domain, struct ltt_session *session)
2095{
2096 int ret;
2097 struct ltt_kernel_session *ksess = session->kernel_session;
2098 struct ltt_ust_session *usess = session->ust_session;
2099 struct consumer_output *consumer;
2100
2101 assert(session);
2102
2103 if (session->enabled) {
2104 /* Can't disable consumer on an already started session */
f73fabfd 2105 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2106 goto error;
2107 }
2108
2109 if (!session->start_consumer) {
f73fabfd 2110 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
2111 goto error;
2112 }
2113
2114 switch (domain) {
2115 case 0:
2116 DBG("Disable tracing session %s consumer", session->name);
2117 consumer = session->consumer;
2118 break;
2119 case LTTNG_DOMAIN_KERNEL:
2120 /* Code flow error if we don't have a kernel session here. */
2121 assert(ksess);
2122
2123 DBG("Disabling kernel consumer");
2124 consumer = ksess->consumer;
2125
2126 break;
2127 case LTTNG_DOMAIN_UST:
2128 /* Code flow error if we don't have a UST session here. */
2129 assert(usess);
2130
2131 DBG("Disabling UST consumer");
2132 consumer = usess->consumer;
2133
2134 break;
2135 default:
f73fabfd 2136 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
2137 goto error;
2138 }
2139
2140 if (consumer) {
2141 consumer->enabled = 0;
2142 /* Success at this point */
f73fabfd 2143 ret = LTTNG_OK;
2f77fc4b 2144 } else {
f73fabfd 2145 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
2146 }
2147
2148error:
2149 return ret;
2150}
2151
2152/*
2153 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2154 */
2155int cmd_enable_consumer(int domain, struct ltt_session *session)
2156{
2157 int ret;
2158 struct ltt_kernel_session *ksess = session->kernel_session;
2159 struct ltt_ust_session *usess = session->ust_session;
2160 struct consumer_output *consumer = NULL;
2161
2162 assert(session);
2163
2164 /* Can't enable consumer after session started. */
2165 if (session->enabled) {
f73fabfd 2166 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2167 goto error;
2168 }
2169
2f77fc4b
DG
2170 switch (domain) {
2171 case 0:
2172 assert(session->consumer);
2173 consumer = session->consumer;
2174 break;
2175 case LTTNG_DOMAIN_KERNEL:
2176 /* Code flow error if we don't have a kernel session here. */
2177 assert(ksess);
2178
2179 /*
2180 * Check if we have already sent fds to the consumer. In that case,
2181 * the enable-consumer command can't be used because a start trace
2182 * had previously occured.
2183 */
2184 if (ksess->consumer_fds_sent) {
f73fabfd 2185 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
2186 goto error;
2187 }
2188
2189 consumer = ksess->tmp_consumer;
2190 if (consumer == NULL) {
f73fabfd 2191 ret = LTTNG_OK;
2f77fc4b
DG
2192 /* No temp. consumer output exists. Using the current one. */
2193 DBG3("No temporary consumer. Using default");
2194 consumer = ksess->consumer;
2195 goto error;
2196 }
2197
2198 switch (consumer->type) {
2199 case CONSUMER_DST_LOCAL:
2200 DBG2("Consumer output is local. Creating directory(ies)");
2201
2202 /* Create directory(ies) */
2203 ret = run_as_mkdir_recursive(consumer->dst.trace_path,
2204 S_IRWXU | S_IRWXG, session->uid, session->gid);
2205 if (ret < 0) {
2206 if (ret != -EEXIST) {
2207 ERR("Trace directory creation error");
f73fabfd 2208 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2209 goto error;
2210 }
2211 }
2212 break;
2213 case CONSUMER_DST_NET:
2214 DBG2("Consumer output is network. Validating URIs");
2215 /* Validate if we have both control and data path set. */
2216 if (!consumer->dst.net.control_isset) {
f73fabfd 2217 ret = LTTNG_ERR_URL_CTRL_MISS;
2f77fc4b
DG
2218 goto error;
2219 }
2220
2221 if (!consumer->dst.net.data_isset) {
f73fabfd 2222 ret = LTTNG_ERR_URL_DATA_MISS;
2f77fc4b
DG
2223 goto error;
2224 }
2225
2226 /* Check established network session state */
2227 if (session->net_handle == 0) {
f73fabfd 2228 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
2229 ERR("Session network handle is not set on enable-consumer");
2230 goto error;
2231 }
2232
2233 break;
2234 }
2235
2f77fc4b
DG
2236 /*
2237 * @session-lock
2238 * This is race free for now since the session lock is acquired before
2239 * ending up in this function. No other threads can access this kernel
2240 * session without this lock hence freeing the consumer output object
2241 * is valid.
2242 */
2243 rcu_read_lock();
9a572cf5 2244 /* Destroy current consumer. We are about to replace it */
2f77fc4b
DG
2245 consumer_destroy_output(ksess->consumer);
2246 rcu_read_unlock();
2247 ksess->consumer = consumer;
2248 ksess->tmp_consumer = NULL;
2249
2250 break;
2251 case LTTNG_DOMAIN_UST:
2252 /* Code flow error if we don't have a UST session here. */
2253 assert(usess);
2254
2255 /*
2256 * Check if we have already sent fds to the consumer. In that case,
2257 * the enable-consumer command can't be used because a start trace
2258 * had previously occured.
2259 */
2260 if (usess->start_trace) {
f73fabfd 2261 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
2262 goto error;
2263 }
2264
2265 consumer = usess->tmp_consumer;
2266 if (consumer == NULL) {
f73fabfd 2267 ret = LTTNG_OK;
2f77fc4b
DG
2268 /* No temp. consumer output exists. Using the current one. */
2269 DBG3("No temporary consumer. Using default");
2270 consumer = usess->consumer;
2271 goto error;
2272 }
2273
2274 switch (consumer->type) {
2275 case CONSUMER_DST_LOCAL:
2276 DBG2("Consumer output is local. Creating directory(ies)");
2277
2278 /* Create directory(ies) */
2279 ret = run_as_mkdir_recursive(consumer->dst.trace_path,
2280 S_IRWXU | S_IRWXG, session->uid, session->gid);
2281 if (ret < 0) {
2282 if (ret != -EEXIST) {
2283 ERR("Trace directory creation error");
f73fabfd 2284 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2285 goto error;
2286 }
2287 }
2288 break;
2289 case CONSUMER_DST_NET:
2290 DBG2("Consumer output is network. Validating URIs");
2291 /* Validate if we have both control and data path set. */
2292 if (!consumer->dst.net.control_isset) {
f73fabfd 2293 ret = LTTNG_ERR_URL_CTRL_MISS;
2f77fc4b
DG
2294 goto error;
2295 }
2296
2297 if (!consumer->dst.net.data_isset) {
f73fabfd 2298 ret = LTTNG_ERR_URL_DATA_MISS;
2f77fc4b
DG
2299 goto error;
2300 }
2301
2302 /* Check established network session state */
2303 if (session->net_handle == 0) {
f73fabfd 2304 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
2305 DBG2("Session network handle is not set on enable-consumer");
2306 goto error;
2307 }
2308
2309 if (consumer->net_seq_index == -1) {
f73fabfd 2310 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
2311 DBG2("Network index is not set on the consumer");
2312 goto error;
2313 }
2314
2315 break;
2316 }
2317
2f77fc4b
DG
2318 /*
2319 * @session-lock
2320 * This is race free for now since the session lock is acquired before
2321 * ending up in this function. No other threads can access this kernel
2322 * session without this lock hence freeing the consumer output object
2323 * is valid.
2324 */
2325 rcu_read_lock();
9a572cf5 2326 /* Destroy current consumer. We are about to replace it */
2f77fc4b
DG
2327 consumer_destroy_output(usess->consumer);
2328 rcu_read_unlock();
2329 usess->consumer = consumer;
2330 usess->tmp_consumer = NULL;
2331
2332 break;
2333 }
2334
4b35a6b3
DG
2335 session->start_consumer = 1;
2336
2f77fc4b
DG
2337 /* Enable it */
2338 if (consumer) {
2339 consumer->enabled = 1;
2340 /* Success at this point */
f73fabfd 2341 ret = LTTNG_OK;
2f77fc4b
DG
2342 } else {
2343 /* Should not really happend... */
f73fabfd 2344 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
2345 }
2346
2347error:
2348 return ret;
2349}
2350
806e2684 2351/*
6d805429
DG
2352 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2353 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
806e2684 2354 */
6d805429 2355int cmd_data_pending(struct ltt_session *session)
806e2684
DG
2356{
2357 int ret;
2358 struct ltt_kernel_session *ksess = session->kernel_session;
2359 struct ltt_ust_session *usess = session->ust_session;
2360
2361 assert(session);
2362
2363 /* Session MUST be stopped to ask for data availability. */
2364 if (session->enabled) {
2365 ret = LTTNG_ERR_SESSION_STARTED;
2366 goto error;
2367 }
2368
2369 if (ksess && ksess->consumer) {
6d805429
DG
2370 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2371 if (ret == 1) {
806e2684
DG
2372 /* Data is still being extracted for the kernel. */
2373 goto error;
2374 }
2375 }
2376
2377 if (usess && usess->consumer) {
6d805429
DG
2378 ret = consumer_is_data_pending(usess->id, usess->consumer);
2379 if (ret == 1) {
806e2684
DG
2380 /* Data is still being extracted for the kernel. */
2381 goto error;
2382 }
2383 }
2384
2385 /* Data is ready to be read by a viewer */
6d805429 2386 ret = 0;
806e2684
DG
2387
2388error:
2389 return ret;
2390}
2391
2f77fc4b
DG
2392/*
2393 * Init command subsystem.
2394 */
2395void cmd_init(void)
2396{
2397 /*
2398 * Set network sequence index to 1 for streams to match a relayd socket on
2399 * the consumer side.
2400 */
2401 uatomic_set(&relayd_net_seq_idx, 1);
2402
2403 DBG("Command subsystem initialized");
2404}
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