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[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
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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 "health.h"
32#include "kernel.h"
33#include "kernel-consumer.h"
34#include "lttng-sessiond.h"
35#include "utils.h"
36
37#include "cmd.h"
38
39/*
40 * Used to keep a unique index for each relayd socket created where this value
41 * is associated with streams on the consumer so it can match the right relayd
42 * to send to. It must be accessed with the relayd_net_seq_idx_lock
43 * held.
44 */
45static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
46static uint64_t 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 /*
105 * Do we have a UST url set. If yes, this means we have both kernel and UST
106 * to print.
107 */
108 if (*tmp_uurl != '\0') {
109 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
110 tmp_urls, kdata_port, tmp_uurl, udata_port);
111 } else {
112 int dport;
113 if (kuri) {
114 dport = kdata_port;
115 } else {
116 /* No kernel URI, use the UST port. */
117 dport = udata_port;
118 }
119 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
120 }
121
122error:
123 return ret;
124}
125
126/*
127 * Fill lttng_channel array of all channels.
128 */
129static void list_lttng_channels(int domain, struct ltt_session *session,
130 struct lttng_channel *channels)
131{
132 int i = 0;
133 struct ltt_kernel_channel *kchan;
134
135 DBG("Listing channels for session %s", session->name);
136
137 switch (domain) {
138 case LTTNG_DOMAIN_KERNEL:
139 /* Kernel channels */
140 if (session->kernel_session != NULL) {
141 cds_list_for_each_entry(kchan,
142 &session->kernel_session->channel_list.head, list) {
143 /* Copy lttng_channel struct to array */
144 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
145 channels[i].enabled = kchan->enabled;
146 i++;
147 }
148 }
149 break;
150 case LTTNG_DOMAIN_UST:
151 {
152 struct lttng_ht_iter iter;
153 struct ltt_ust_channel *uchan;
154
155 rcu_read_lock();
156 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
157 &iter.iter, uchan, node.node) {
158 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
159 channels[i].attr.overwrite = uchan->attr.overwrite;
160 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
161 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
162 channels[i].attr.switch_timer_interval =
163 uchan->attr.switch_timer_interval;
164 channels[i].attr.read_timer_interval =
165 uchan->attr.read_timer_interval;
166 channels[i].enabled = uchan->enabled;
167 switch (uchan->attr.output) {
168 case LTTNG_UST_MMAP:
169 default:
170 channels[i].attr.output = LTTNG_EVENT_MMAP;
171 break;
172 }
173 i++;
174 }
175 rcu_read_unlock();
176 break;
177 }
178 default:
179 break;
180 }
181}
182
183/*
184 * Create a list of ust global domain events.
185 */
186static int list_lttng_ust_global_events(char *channel_name,
187 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
188{
189 int i = 0, ret = 0;
190 unsigned int nb_event = 0;
191 struct lttng_ht_iter iter;
192 struct lttng_ht_node_str *node;
193 struct ltt_ust_channel *uchan;
194 struct ltt_ust_event *uevent;
195 struct lttng_event *tmp;
196
197 DBG("Listing UST global events for channel %s", channel_name);
198
199 rcu_read_lock();
200
201 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
202 node = lttng_ht_iter_get_node_str(&iter);
203 if (node == NULL) {
204 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
205 goto error;
206 }
207
208 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
209
210 nb_event += lttng_ht_get_count(uchan->events);
211
212 if (nb_event == 0) {
213 ret = nb_event;
214 goto error;
215 }
216
217 DBG3("Listing UST global %d events", nb_event);
218
219 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
220 if (tmp == NULL) {
221 ret = LTTNG_ERR_FATAL;
222 goto error;
223 }
224
225 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
226 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
227 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
228 tmp[i].enabled = uevent->enabled;
229
230 switch (uevent->attr.instrumentation) {
231 case LTTNG_UST_TRACEPOINT:
232 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
233 break;
234 case LTTNG_UST_PROBE:
235 tmp[i].type = LTTNG_EVENT_PROBE;
236 break;
237 case LTTNG_UST_FUNCTION:
238 tmp[i].type = LTTNG_EVENT_FUNCTION;
239 break;
240 }
241
242 tmp[i].loglevel = uevent->attr.loglevel;
243 switch (uevent->attr.loglevel_type) {
244 case LTTNG_UST_LOGLEVEL_ALL:
245 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
246 break;
247 case LTTNG_UST_LOGLEVEL_RANGE:
248 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
249 break;
250 case LTTNG_UST_LOGLEVEL_SINGLE:
251 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
252 break;
253 }
254 if (uevent->filter) {
255 tmp[i].filter = 1;
256 }
257 i++;
258 }
259
260 ret = nb_event;
261 *events = tmp;
262
263error:
264 rcu_read_unlock();
265 return ret;
266}
267
268/*
269 * Fill lttng_event array of all kernel events in the channel.
270 */
271static int list_lttng_kernel_events(char *channel_name,
272 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
273{
274 int i = 0, ret;
275 unsigned int nb_event;
276 struct ltt_kernel_event *event;
277 struct ltt_kernel_channel *kchan;
278
279 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
280 if (kchan == NULL) {
281 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
282 goto error;
283 }
284
285 nb_event = kchan->event_count;
286
287 DBG("Listing events for channel %s", kchan->channel->name);
288
289 if (nb_event == 0) {
290 goto end;
291 }
292
293 *events = zmalloc(nb_event * sizeof(struct lttng_event));
294 if (*events == NULL) {
295 ret = LTTNG_ERR_FATAL;
296 goto error;
297 }
298
299 /* Kernel channels */
300 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
301 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
302 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
303 (*events)[i].enabled = event->enabled;
304
305 switch (event->event->instrumentation) {
306 case LTTNG_KERNEL_TRACEPOINT:
307 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
308 break;
309 case LTTNG_KERNEL_KRETPROBE:
310 (*events)[i].type = LTTNG_EVENT_FUNCTION;
311 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
312 sizeof(struct lttng_kernel_kprobe));
313 break;
314 case LTTNG_KERNEL_KPROBE:
315 (*events)[i].type = LTTNG_EVENT_PROBE;
316 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
317 sizeof(struct lttng_kernel_kprobe));
318 break;
319 case LTTNG_KERNEL_FUNCTION:
320 (*events)[i].type = LTTNG_EVENT_FUNCTION;
321 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
322 sizeof(struct lttng_kernel_function));
323 break;
324 case LTTNG_KERNEL_NOOP:
325 (*events)[i].type = LTTNG_EVENT_NOOP;
326 break;
327 case LTTNG_KERNEL_SYSCALL:
328 (*events)[i].type = LTTNG_EVENT_SYSCALL;
329 break;
330 case LTTNG_KERNEL_ALL:
331 assert(0);
332 break;
333 }
334 i++;
335 }
336
337end:
338 return nb_event;
339
340error:
341 /* Negate the error code to differentiate the size from an error */
342 return -ret;
343}
344
345/*
346 * Add URI so the consumer output object. Set the correct path depending on the
347 * domain adding the default trace directory.
348 */
349static int add_uri_to_consumer(struct consumer_output *consumer,
350 struct lttng_uri *uri, int domain, const char *session_name)
351{
352 int ret = LTTNG_OK;
353 const char *default_trace_dir;
354
355 assert(uri);
356
357 if (consumer == NULL) {
358 DBG("No consumer detected. Don't add URI. Stopping.");
359 ret = LTTNG_ERR_NO_CONSUMER;
360 goto error;
361 }
362
363 switch (domain) {
364 case LTTNG_DOMAIN_KERNEL:
365 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
366 break;
367 case LTTNG_DOMAIN_UST:
368 default_trace_dir = DEFAULT_UST_TRACE_DIR;
369 break;
370 default:
371 /*
372 * This case is possible is we try to add the URI to the global tracing
373 * session consumer object which in this case there is no subdir.
374 */
375 default_trace_dir = "";
376 }
377
378 switch (uri->dtype) {
379 case LTTNG_DST_IPV4:
380 case LTTNG_DST_IPV6:
381 DBG2("Setting network URI to consumer");
382
383 consumer->type = CONSUMER_DST_NET;
384
385 if ((uri->stype == LTTNG_STREAM_CONTROL &&
386 consumer->dst.net.control_isset) ||
387 (uri->stype == LTTNG_STREAM_DATA &&
388 consumer->dst.net.data_isset)) {
389 ret = LTTNG_ERR_URL_EXIST;
390 goto error;
391 }
392
393 /* Set URI into consumer output object */
394 ret = consumer_set_network_uri(consumer, uri);
395 if (ret < 0) {
396 ret = LTTNG_ERR_FATAL;
397 goto error;
398 } else if (ret == 1) {
399 /*
400 * URI was the same in the consumer so we do not append the subdir
401 * again so to not duplicate output dir.
402 */
403 goto error;
404 }
405
406 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
407 ret = consumer_set_subdir(consumer, session_name);
408 if (ret < 0) {
409 ret = LTTNG_ERR_FATAL;
410 goto error;
411 }
412 }
413
414 if (uri->stype == LTTNG_STREAM_CONTROL) {
415 /* On a new subdir, reappend the default trace dir. */
416 strncat(consumer->subdir, default_trace_dir,
417 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
418 DBG3("Append domain trace name to subdir %s", consumer->subdir);
419 }
420
421 break;
422 case LTTNG_DST_PATH:
423 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
424 memset(consumer->dst.trace_path, 0,
425 sizeof(consumer->dst.trace_path));
426 strncpy(consumer->dst.trace_path, uri->dst.path,
427 sizeof(consumer->dst.trace_path));
428 /* Append default trace dir */
429 strncat(consumer->dst.trace_path, default_trace_dir,
430 sizeof(consumer->dst.trace_path) -
431 strlen(consumer->dst.trace_path) - 1);
432 /* Flag consumer as local. */
433 consumer->type = CONSUMER_DST_LOCAL;
434 break;
435 }
436
437error:
438 return ret;
439}
440
441/*
442 * Init tracing by creating trace directory and sending fds kernel consumer.
443 */
444static int init_kernel_tracing(struct ltt_kernel_session *session)
445{
446 int ret = 0;
447 struct lttng_ht_iter iter;
448 struct consumer_socket *socket;
449
450 assert(session);
451
452 rcu_read_lock();
453
454 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
455 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
456 socket, node.node) {
457 /* Code flow error */
458 assert(socket->fd >= 0);
459
460 pthread_mutex_lock(socket->lock);
461 ret = kernel_consumer_send_session(socket, session);
462 pthread_mutex_unlock(socket->lock);
463 if (ret < 0) {
464 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
465 goto error;
466 }
467 }
468 }
469
470error:
471 rcu_read_unlock();
472 return ret;
473}
474
475/*
476 * Create a socket to the relayd using the URI.
477 *
478 * On success, the relayd_sock pointer is set to the created socket.
479 * Else, it's stays untouched and a lttcomm error code is returned.
480 */
481static int create_connect_relayd(struct consumer_output *output,
482 const char *session_name, struct lttng_uri *uri,
483 struct lttcomm_sock **relayd_sock)
484{
485 int ret;
486 struct lttcomm_sock *sock;
487
488 /* Create socket object from URI */
489 sock = lttcomm_alloc_sock_from_uri(uri);
490 if (sock == NULL) {
491 ret = LTTNG_ERR_FATAL;
492 goto error;
493 }
494
495 ret = lttcomm_create_sock(sock);
496 if (ret < 0) {
497 ret = LTTNG_ERR_FATAL;
498 goto error;
499 }
500
501 /*
502 * Connect to relayd so we can proceed with a session creation. This call
503 * can possibly block for an arbitrary amount of time to set the health
504 * state to be in poll execution.
505 */
506 health_poll_entry();
507 ret = relayd_connect(sock);
508 health_poll_exit();
509 if (ret < 0) {
510 ERR("Unable to reach lttng-relayd");
511 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
512 goto free_sock;
513 }
514
515 /* Create socket for control stream. */
516 if (uri->stype == LTTNG_STREAM_CONTROL) {
517 DBG3("Creating relayd stream socket from URI");
518
519 /* Check relayd version */
520 ret = relayd_version_check(sock, RELAYD_VERSION_COMM_MAJOR,
521 RELAYD_VERSION_COMM_MINOR);
522 if (ret < 0) {
523 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
524 goto close_sock;
525 }
526 } else if (uri->stype == LTTNG_STREAM_DATA) {
527 DBG3("Creating relayd data socket from URI");
528 } else {
529 /* Command is not valid */
530 ERR("Relayd invalid stream type: %d", uri->stype);
531 ret = LTTNG_ERR_INVALID;
532 goto close_sock;
533 }
534
535 *relayd_sock = sock;
536
537 return LTTNG_OK;
538
539close_sock:
540 if (sock) {
541 (void) relayd_close(sock);
542 }
543free_sock:
544 if (sock) {
545 lttcomm_destroy_sock(sock);
546 }
547error:
548 return ret;
549}
550
551/*
552 * Connect to the relayd using URI and send the socket to the right consumer.
553 */
554static int send_consumer_relayd_socket(int domain, struct ltt_session *session,
555 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
556 struct consumer_socket *consumer_sock)
557{
558 int ret;
559 struct lttcomm_sock *sock = NULL;
560
561 /* Connect to relayd and make version check if uri is the control. */
562 ret = create_connect_relayd(consumer, session->name, relayd_uri, &sock);
563 if (ret != LTTNG_OK) {
564 goto close_sock;
565 }
566
567 /* If the control socket is connected, network session is ready */
568 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
569 session->net_handle = 1;
570 }
571
572 /* Set the network sequence index if not set. */
573 if (consumer->net_seq_index == (uint64_t) -1ULL) {
574 pthread_mutex_lock(&relayd_net_seq_idx_lock);
575 /*
576 * Increment net_seq_idx because we are about to transfer the
577 * new relayd socket to the consumer.
578 * Assign unique key so the consumer can match streams.
579 */
580 consumer->net_seq_index = ++relayd_net_seq_idx;
581 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
582 }
583
584 /* Send relayd socket to consumer. */
585 ret = consumer_send_relayd_socket(consumer_sock, sock,
586 consumer, relayd_uri->stype, session->id);
587 if (ret < 0) {
588 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
589 goto close_sock;
590 }
591
592 /* Flag that the corresponding socket was sent. */
593 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
594 consumer_sock->control_sock_sent = 1;
595 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
596 consumer_sock->data_sock_sent = 1;
597 }
598
599 ret = LTTNG_OK;
600
601 /*
602 * Close socket which was dup on the consumer side. The session daemon does
603 * NOT keep track of the relayd socket(s) once transfer to the consumer.
604 */
605
606close_sock:
607 if (sock) {
608 (void) relayd_close(sock);
609 lttcomm_destroy_sock(sock);
610 }
611
612 if (ret != LTTNG_OK) {
613 /*
614 * On error, nullify the consumer sequence index so streams are not
615 * associated with it once sent to the consumer.
616 */
617 uatomic_set(&consumer->net_seq_index, -1);
618 }
619
620 return ret;
621}
622
623/*
624 * Send both relayd sockets to a specific consumer and domain. This is a
625 * helper function to facilitate sending the information to the consumer for a
626 * session.
627 */
628static int send_consumer_relayd_sockets(int domain,
629 struct ltt_session *session, struct consumer_output *consumer,
630 struct consumer_socket *sock)
631{
632 int ret = LTTNG_OK;
633
634 assert(session);
635 assert(consumer);
636
637 /* Sending control relayd socket. */
638 if (!sock->control_sock_sent) {
639 ret = send_consumer_relayd_socket(domain, session,
640 &consumer->dst.net.control, consumer, sock);
641 if (ret != LTTNG_OK) {
642 goto error;
643 }
644 }
645
646 /* Sending data relayd socket. */
647 if (!sock->data_sock_sent) {
648 ret = send_consumer_relayd_socket(domain, session,
649 &consumer->dst.net.data, consumer, sock);
650 if (ret != LTTNG_OK) {
651 goto error;
652 }
653 }
654
655error:
656 return ret;
657}
658
659/*
660 * Setup relayd connections for a tracing session. First creates the socket to
661 * the relayd and send them to the right domain consumer. Consumer type MUST be
662 * network.
663 */
664int cmd_setup_relayd(struct ltt_session *session)
665{
666 int ret = LTTNG_OK;
667 struct ltt_ust_session *usess;
668 struct ltt_kernel_session *ksess;
669 struct consumer_socket *socket;
670 struct lttng_ht_iter iter;
671
672 assert(session);
673
674 usess = session->ust_session;
675 ksess = session->kernel_session;
676
677 DBG("Setting relayd for session %s", session->name);
678
679 rcu_read_lock();
680
681 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
682 && usess->consumer->enabled) {
683 /* For each consumer socket, send relayd sockets */
684 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
685 socket, node.node) {
686 /* Code flow error */
687 assert(socket->fd >= 0);
688
689 pthread_mutex_lock(socket->lock);
690 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session,
691 usess->consumer, socket);
692 pthread_mutex_unlock(socket->lock);
693 if (ret != LTTNG_OK) {
694 goto error;
695 }
696 }
697 }
698
699 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
700 && ksess->consumer->enabled) {
701 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
702 socket, node.node) {
703 /* Code flow error */
704 assert(socket->fd >= 0);
705
706 pthread_mutex_lock(socket->lock);
707 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session,
708 ksess->consumer, socket);
709 pthread_mutex_unlock(socket->lock);
710 if (ret != LTTNG_OK) {
711 goto error;
712 }
713 }
714 }
715
716error:
717 rcu_read_unlock();
718 return ret;
719}
720
721/*
722 * Start a kernel session by opening all necessary streams.
723 */
724static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
725{
726 int ret;
727 struct ltt_kernel_channel *kchan;
728
729 /* Open kernel metadata */
730 if (ksess->metadata == NULL) {
731 ret = kernel_open_metadata(ksess);
732 if (ret < 0) {
733 ret = LTTNG_ERR_KERN_META_FAIL;
734 goto error;
735 }
736 }
737
738 /* Open kernel metadata stream */
739 if (ksess->metadata_stream_fd < 0) {
740 ret = kernel_open_metadata_stream(ksess);
741 if (ret < 0) {
742 ERR("Kernel create metadata stream failed");
743 ret = LTTNG_ERR_KERN_STREAM_FAIL;
744 goto error;
745 }
746 }
747
748 /* For each channel */
749 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
750 if (kchan->stream_count == 0) {
751 ret = kernel_open_channel_stream(kchan);
752 if (ret < 0) {
753 ret = LTTNG_ERR_KERN_STREAM_FAIL;
754 goto error;
755 }
756 /* Update the stream global counter */
757 ksess->stream_count_global += ret;
758 }
759 }
760
761 /* Setup kernel consumer socket and send fds to it */
762 ret = init_kernel_tracing(ksess);
763 if (ret < 0) {
764 ret = LTTNG_ERR_KERN_START_FAIL;
765 goto error;
766 }
767
768 /* This start the kernel tracing */
769 ret = kernel_start_session(ksess);
770 if (ret < 0) {
771 ret = LTTNG_ERR_KERN_START_FAIL;
772 goto error;
773 }
774
775 /* Quiescent wait after starting trace */
776 kernel_wait_quiescent(kernel_tracer_fd);
777
778 ksess->started = 1;
779
780 ret = LTTNG_OK;
781
782error:
783 return ret;
784}
785
786/*
787 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
788 */
789int cmd_disable_channel(struct ltt_session *session, int domain,
790 char *channel_name)
791{
792 int ret;
793 struct ltt_ust_session *usess;
794
795 usess = session->ust_session;
796
797 rcu_read_lock();
798
799 switch (domain) {
800 case LTTNG_DOMAIN_KERNEL:
801 {
802 ret = channel_kernel_disable(session->kernel_session,
803 channel_name);
804 if (ret != LTTNG_OK) {
805 goto error;
806 }
807
808 kernel_wait_quiescent(kernel_tracer_fd);
809 break;
810 }
811 case LTTNG_DOMAIN_UST:
812 {
813 struct ltt_ust_channel *uchan;
814 struct lttng_ht *chan_ht;
815
816 chan_ht = usess->domain_global.channels;
817
818 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
819 if (uchan == NULL) {
820 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
821 goto error;
822 }
823
824 ret = channel_ust_disable(usess, uchan);
825 if (ret != LTTNG_OK) {
826 goto error;
827 }
828 break;
829 }
830#if 0
831 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
832 case LTTNG_DOMAIN_UST_EXEC_NAME:
833 case LTTNG_DOMAIN_UST_PID:
834#endif
835 default:
836 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
837 goto error;
838 }
839
840 ret = LTTNG_OK;
841
842error:
843 rcu_read_unlock();
844 return ret;
845}
846
847/*
848 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
849 *
850 * The wpipe arguments is used as a notifier for the kernel thread.
851 */
852int cmd_enable_channel(struct ltt_session *session,
853 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
854{
855 int ret;
856 struct ltt_ust_session *usess = session->ust_session;
857 struct lttng_ht *chan_ht;
858
859 assert(session);
860 assert(attr);
861 assert(domain);
862
863 DBG("Enabling channel %s for session %s", attr->name, session->name);
864
865 rcu_read_lock();
866
867 switch (domain->type) {
868 case LTTNG_DOMAIN_KERNEL:
869 {
870 struct ltt_kernel_channel *kchan;
871
872 kchan = trace_kernel_get_channel_by_name(attr->name,
873 session->kernel_session);
874 if (kchan == NULL) {
875 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
876 } else {
877 ret = channel_kernel_enable(session->kernel_session, kchan);
878 }
879
880 if (ret != LTTNG_OK) {
881 goto error;
882 }
883
884 kernel_wait_quiescent(kernel_tracer_fd);
885
886 /*
887 * If the session was previously started, start as well this newly
888 * created kernel session so the events/channels enabled *after* the
889 * start actually work.
890 */
891 if (session->started && !session->kernel_session->started) {
892 ret = start_kernel_session(session->kernel_session, wpipe);
893 if (ret != LTTNG_OK) {
894 goto error;
895 }
896 }
897 break;
898 }
899 case LTTNG_DOMAIN_UST:
900 {
901 struct ltt_ust_channel *uchan;
902
903 chan_ht = usess->domain_global.channels;
904
905 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
906 if (uchan == NULL) {
907 ret = channel_ust_create(usess, attr, domain->buf_type);
908 } else {
909 ret = channel_ust_enable(usess, uchan);
910 }
911
912 /* Start the UST session if the session was already started. */
913 if (session->started && !usess->start_trace) {
914 ret = ust_app_start_trace_all(usess);
915 if (ret < 0) {
916 ret = LTTNG_ERR_UST_START_FAIL;
917 goto error;
918 }
919 ret = LTTNG_OK;
920 usess->start_trace = 1;
921 }
922 break;
923 }
924 default:
925 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
926 goto error;
927 }
928
929error:
930 rcu_read_unlock();
931 return ret;
932}
933
934
935/*
936 * Command LTTNG_DISABLE_EVENT processed by the client thread.
937 */
938int cmd_disable_event(struct ltt_session *session, int domain,
939 char *channel_name, char *event_name)
940{
941 int ret;
942
943 rcu_read_lock();
944
945 switch (domain) {
946 case LTTNG_DOMAIN_KERNEL:
947 {
948 struct ltt_kernel_channel *kchan;
949 struct ltt_kernel_session *ksess;
950
951 ksess = session->kernel_session;
952
953 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
954 if (kchan == NULL) {
955 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
956 goto error;
957 }
958
959 ret = event_kernel_disable_tracepoint(kchan, event_name);
960 if (ret != LTTNG_OK) {
961 goto error;
962 }
963
964 kernel_wait_quiescent(kernel_tracer_fd);
965 break;
966 }
967 case LTTNG_DOMAIN_UST:
968 {
969 struct ltt_ust_channel *uchan;
970 struct ltt_ust_session *usess;
971
972 usess = session->ust_session;
973
974 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
975 channel_name);
976 if (uchan == NULL) {
977 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
978 goto error;
979 }
980
981 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
982 if (ret != LTTNG_OK) {
983 goto error;
984 }
985
986 DBG3("Disable UST event %s in channel %s completed", event_name,
987 channel_name);
988 break;
989 }
990#if 0
991 case LTTNG_DOMAIN_UST_EXEC_NAME:
992 case LTTNG_DOMAIN_UST_PID:
993 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
994#endif
995 default:
996 ret = LTTNG_ERR_UND;
997 goto error;
998 }
999
1000 ret = LTTNG_OK;
1001
1002error:
1003 rcu_read_unlock();
1004 return ret;
1005}
1006
1007/*
1008 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1009 */
1010int cmd_disable_event_all(struct ltt_session *session, int domain,
1011 char *channel_name)
1012{
1013 int ret;
1014
1015 rcu_read_lock();
1016
1017 switch (domain) {
1018 case LTTNG_DOMAIN_KERNEL:
1019 {
1020 struct ltt_kernel_session *ksess;
1021 struct ltt_kernel_channel *kchan;
1022
1023 ksess = session->kernel_session;
1024
1025 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1026 if (kchan == NULL) {
1027 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1028 goto error;
1029 }
1030
1031 ret = event_kernel_disable_all(kchan);
1032 if (ret != LTTNG_OK) {
1033 goto error;
1034 }
1035
1036 kernel_wait_quiescent(kernel_tracer_fd);
1037 break;
1038 }
1039 case LTTNG_DOMAIN_UST:
1040 {
1041 struct ltt_ust_session *usess;
1042 struct ltt_ust_channel *uchan;
1043
1044 usess = session->ust_session;
1045
1046 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1047 channel_name);
1048 if (uchan == NULL) {
1049 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1050 goto error;
1051 }
1052
1053 ret = event_ust_disable_all_tracepoints(usess, uchan);
1054 if (ret != 0) {
1055 goto error;
1056 }
1057
1058 DBG3("Disable all UST events in channel %s completed", channel_name);
1059
1060 break;
1061 }
1062#if 0
1063 case LTTNG_DOMAIN_UST_EXEC_NAME:
1064 case LTTNG_DOMAIN_UST_PID:
1065 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1066#endif
1067 default:
1068 ret = LTTNG_ERR_UND;
1069 goto error;
1070 }
1071
1072 ret = LTTNG_OK;
1073
1074error:
1075 rcu_read_unlock();
1076 return ret;
1077}
1078
1079/*
1080 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1081 */
1082int cmd_add_context(struct ltt_session *session, int domain,
1083 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1084{
1085 int ret;
1086
1087 switch (domain) {
1088 case LTTNG_DOMAIN_KERNEL:
1089 assert(session->kernel_session);
1090
1091 if (session->kernel_session->channel_count == 0) {
1092 /* Create default channel */
1093 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1094 if (ret != LTTNG_OK) {
1095 goto error;
1096 }
1097 }
1098
1099 /* Add kernel context to kernel tracer */
1100 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1101 if (ret != LTTNG_OK) {
1102 goto error;
1103 }
1104 break;
1105 case LTTNG_DOMAIN_UST:
1106 {
1107 struct ltt_ust_session *usess = session->ust_session;
1108 assert(usess);
1109
1110 unsigned int chan_count =
1111 lttng_ht_get_count(usess->domain_global.channels);
1112 if (chan_count == 0) {
1113 struct lttng_channel *attr;
1114 /* Create default channel */
1115 attr = channel_new_default_attr(domain);
1116 if (attr == NULL) {
1117 ret = LTTNG_ERR_FATAL;
1118 goto error;
1119 }
1120
1121 ret = channel_ust_create(usess, attr, usess->buffer_type);
1122 if (ret != LTTNG_OK) {
1123 free(attr);
1124 goto error;
1125 }
1126 free(attr);
1127 }
1128
1129 ret = context_ust_add(usess, domain, ctx, channel_name);
1130 if (ret != LTTNG_OK) {
1131 goto error;
1132 }
1133 break;
1134 }
1135#if 0
1136 case LTTNG_DOMAIN_UST_EXEC_NAME:
1137 case LTTNG_DOMAIN_UST_PID:
1138 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1139#endif
1140 default:
1141 ret = LTTNG_ERR_UND;
1142 goto error;
1143 }
1144
1145 ret = LTTNG_OK;
1146
1147error:
1148 return ret;
1149}
1150
1151/*
1152 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1153 */
1154int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1155 char *channel_name, struct lttng_event *event,
1156 struct lttng_filter_bytecode *filter, int wpipe)
1157{
1158 int ret, channel_created = 0;
1159 struct lttng_channel *attr;
1160
1161 assert(session);
1162 assert(event);
1163 assert(channel_name);
1164
1165 rcu_read_lock();
1166
1167 switch (domain->type) {
1168 case LTTNG_DOMAIN_KERNEL:
1169 {
1170 struct ltt_kernel_channel *kchan;
1171
1172 kchan = trace_kernel_get_channel_by_name(channel_name,
1173 session->kernel_session);
1174 if (kchan == NULL) {
1175 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
1176 if (attr == NULL) {
1177 ret = LTTNG_ERR_FATAL;
1178 goto error;
1179 }
1180 strncpy(attr->name, channel_name, sizeof(attr->name));
1181
1182 ret = cmd_enable_channel(session, domain, attr, wpipe);
1183 if (ret != LTTNG_OK) {
1184 free(attr);
1185 goto error;
1186 }
1187 free(attr);
1188
1189 channel_created = 1;
1190 }
1191
1192 /* Get the newly created kernel channel pointer */
1193 kchan = trace_kernel_get_channel_by_name(channel_name,
1194 session->kernel_session);
1195 if (kchan == NULL) {
1196 /* This sould not happen... */
1197 ret = LTTNG_ERR_FATAL;
1198 goto error;
1199 }
1200
1201 ret = event_kernel_enable_tracepoint(kchan, event);
1202 if (ret != LTTNG_OK) {
1203 if (channel_created) {
1204 /* Let's not leak a useless channel. */
1205 kernel_destroy_channel(kchan);
1206 }
1207 goto error;
1208 }
1209
1210 kernel_wait_quiescent(kernel_tracer_fd);
1211 break;
1212 }
1213 case LTTNG_DOMAIN_UST:
1214 {
1215 struct ltt_ust_channel *uchan;
1216 struct ltt_ust_session *usess = session->ust_session;
1217
1218 assert(usess);
1219
1220 /* Get channel from global UST domain */
1221 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1222 channel_name);
1223 if (uchan == NULL) {
1224 /* Create default channel */
1225 attr = channel_new_default_attr(LTTNG_DOMAIN_UST);
1226 if (attr == NULL) {
1227 ret = LTTNG_ERR_FATAL;
1228 goto error;
1229 }
1230 strncpy(attr->name, channel_name, sizeof(attr->name));
1231
1232 ret = cmd_enable_channel(session, domain, attr, wpipe);
1233 if (ret != LTTNG_OK) {
1234 free(attr);
1235 goto error;
1236 }
1237 free(attr);
1238
1239 /* Get the newly created channel reference back */
1240 uchan = trace_ust_find_channel_by_name(
1241 usess->domain_global.channels, channel_name);
1242 assert(uchan);
1243 }
1244
1245 /* At this point, the session and channel exist on the tracer */
1246 ret = event_ust_enable_tracepoint(usess, uchan, event, filter);
1247 if (ret != LTTNG_OK) {
1248 goto error;
1249 }
1250 break;
1251 }
1252#if 0
1253 case LTTNG_DOMAIN_UST_EXEC_NAME:
1254 case LTTNG_DOMAIN_UST_PID:
1255 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1256#endif
1257 default:
1258 ret = LTTNG_ERR_UND;
1259 goto error;
1260 }
1261
1262 ret = LTTNG_OK;
1263
1264error:
1265 rcu_read_unlock();
1266 return ret;
1267}
1268
1269/*
1270 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1271 */
1272int cmd_enable_event_all(struct ltt_session *session,
1273 struct lttng_domain *domain, char *channel_name, int event_type,
1274 struct lttng_filter_bytecode *filter, int wpipe)
1275{
1276 int ret;
1277 struct lttng_channel *attr;
1278
1279 assert(session);
1280 assert(channel_name);
1281
1282 rcu_read_lock();
1283
1284 switch (domain->type) {
1285 case LTTNG_DOMAIN_KERNEL:
1286 {
1287 struct ltt_kernel_channel *kchan;
1288
1289 assert(session->kernel_session);
1290
1291 kchan = trace_kernel_get_channel_by_name(channel_name,
1292 session->kernel_session);
1293 if (kchan == NULL) {
1294 /* Create default channel */
1295 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
1296 if (attr == NULL) {
1297 ret = LTTNG_ERR_FATAL;
1298 goto error;
1299 }
1300 strncpy(attr->name, channel_name, sizeof(attr->name));
1301
1302 ret = cmd_enable_channel(session, domain, attr, wpipe);
1303 if (ret != LTTNG_OK) {
1304 free(attr);
1305 goto error;
1306 }
1307 free(attr);
1308
1309 /* Get the newly created kernel channel pointer */
1310 kchan = trace_kernel_get_channel_by_name(channel_name,
1311 session->kernel_session);
1312 assert(kchan);
1313 }
1314
1315 switch (event_type) {
1316 case LTTNG_EVENT_SYSCALL:
1317 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1318 break;
1319 case LTTNG_EVENT_TRACEPOINT:
1320 /*
1321 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1322 * events already registered to the channel.
1323 */
1324 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1325 break;
1326 case LTTNG_EVENT_ALL:
1327 /* Enable syscalls and tracepoints */
1328 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1329 break;
1330 default:
1331 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1332 goto error;
1333 }
1334
1335 /* Manage return value */
1336 if (ret != LTTNG_OK) {
1337 /*
1338 * On error, cmd_enable_channel call will take care of destroying
1339 * the created channel if it was needed.
1340 */
1341 goto error;
1342 }
1343
1344 kernel_wait_quiescent(kernel_tracer_fd);
1345 break;
1346 }
1347 case LTTNG_DOMAIN_UST:
1348 {
1349 struct ltt_ust_channel *uchan;
1350 struct ltt_ust_session *usess = session->ust_session;
1351
1352 assert(usess);
1353
1354 /* Get channel from global UST domain */
1355 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1356 channel_name);
1357 if (uchan == NULL) {
1358 /* Create default channel */
1359 attr = channel_new_default_attr(LTTNG_DOMAIN_UST);
1360 if (attr == NULL) {
1361 ret = LTTNG_ERR_FATAL;
1362 goto error;
1363 }
1364 strncpy(attr->name, channel_name, sizeof(attr->name));
1365
1366 ret = cmd_enable_channel(session, domain, attr, wpipe);
1367 if (ret != LTTNG_OK) {
1368 free(attr);
1369 goto error;
1370 }
1371 free(attr);
1372
1373 /* Get the newly created channel reference back */
1374 uchan = trace_ust_find_channel_by_name(
1375 usess->domain_global.channels, channel_name);
1376 assert(uchan);
1377 }
1378
1379 /* At this point, the session and channel exist on the tracer */
1380
1381 switch (event_type) {
1382 case LTTNG_EVENT_ALL:
1383 case LTTNG_EVENT_TRACEPOINT:
1384 ret = event_ust_enable_all_tracepoints(usess, uchan, filter);
1385 if (ret != LTTNG_OK) {
1386 goto error;
1387 }
1388 break;
1389 default:
1390 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1391 goto error;
1392 }
1393
1394 /* Manage return value */
1395 if (ret != LTTNG_OK) {
1396 goto error;
1397 }
1398
1399 break;
1400 }
1401#if 0
1402 case LTTNG_DOMAIN_UST_EXEC_NAME:
1403 case LTTNG_DOMAIN_UST_PID:
1404 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1405#endif
1406 default:
1407 ret = LTTNG_ERR_UND;
1408 goto error;
1409 }
1410
1411 ret = LTTNG_OK;
1412
1413error:
1414 rcu_read_unlock();
1415 return ret;
1416}
1417
1418
1419/*
1420 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1421 */
1422ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1423{
1424 int ret;
1425 ssize_t nb_events = 0;
1426
1427 switch (domain) {
1428 case LTTNG_DOMAIN_KERNEL:
1429 nb_events = kernel_list_events(kernel_tracer_fd, events);
1430 if (nb_events < 0) {
1431 ret = LTTNG_ERR_KERN_LIST_FAIL;
1432 goto error;
1433 }
1434 break;
1435 case LTTNG_DOMAIN_UST:
1436 nb_events = ust_app_list_events(events);
1437 if (nb_events < 0) {
1438 ret = LTTNG_ERR_UST_LIST_FAIL;
1439 goto error;
1440 }
1441 break;
1442 default:
1443 ret = LTTNG_ERR_UND;
1444 goto error;
1445 }
1446
1447 return nb_events;
1448
1449error:
1450 /* Return negative value to differentiate return code */
1451 return -ret;
1452}
1453
1454/*
1455 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1456 */
1457ssize_t cmd_list_tracepoint_fields(int domain,
1458 struct lttng_event_field **fields)
1459{
1460 int ret;
1461 ssize_t nb_fields = 0;
1462
1463 switch (domain) {
1464 case LTTNG_DOMAIN_UST:
1465 nb_fields = ust_app_list_event_fields(fields);
1466 if (nb_fields < 0) {
1467 ret = LTTNG_ERR_UST_LIST_FAIL;
1468 goto error;
1469 }
1470 break;
1471 case LTTNG_DOMAIN_KERNEL:
1472 default: /* fall-through */
1473 ret = LTTNG_ERR_UND;
1474 goto error;
1475 }
1476
1477 return nb_fields;
1478
1479error:
1480 /* Return negative value to differentiate return code */
1481 return -ret;
1482}
1483
1484/*
1485 * Command LTTNG_START_TRACE processed by the client thread.
1486 */
1487int cmd_start_trace(struct ltt_session *session)
1488{
1489 int ret;
1490 struct ltt_kernel_session *ksession;
1491 struct ltt_ust_session *usess;
1492
1493 assert(session);
1494
1495 /* Ease our life a bit ;) */
1496 ksession = session->kernel_session;
1497 usess = session->ust_session;
1498
1499 if (session->enabled) {
1500 /* Already started. */
1501 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1502 goto error;
1503 }
1504
1505 session->enabled = 1;
1506
1507 /* Kernel tracing */
1508 if (ksession != NULL) {
1509 ret = start_kernel_session(ksession, kernel_tracer_fd);
1510 if (ret != LTTNG_OK) {
1511 goto error;
1512 }
1513 }
1514
1515 /* Flag session that trace should start automatically */
1516 if (usess) {
1517 usess->start_trace = 1;
1518
1519 ret = ust_app_start_trace_all(usess);
1520 if (ret < 0) {
1521 ret = LTTNG_ERR_UST_START_FAIL;
1522 goto error;
1523 }
1524 }
1525
1526 session->started = 1;
1527
1528 ret = LTTNG_OK;
1529
1530error:
1531 return ret;
1532}
1533
1534/*
1535 * Command LTTNG_STOP_TRACE processed by the client thread.
1536 */
1537int cmd_stop_trace(struct ltt_session *session)
1538{
1539 int ret;
1540 struct ltt_kernel_channel *kchan;
1541 struct ltt_kernel_session *ksession;
1542 struct ltt_ust_session *usess;
1543
1544 assert(session);
1545
1546 /* Short cut */
1547 ksession = session->kernel_session;
1548 usess = session->ust_session;
1549
1550 if (!session->enabled) {
1551 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1552 goto error;
1553 }
1554
1555 session->enabled = 0;
1556
1557 /* Kernel tracer */
1558 if (ksession) {
1559 DBG("Stop kernel tracing");
1560
1561 /* Flush metadata if exist */
1562 if (ksession->metadata_stream_fd >= 0) {
1563 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1564 if (ret < 0) {
1565 ERR("Kernel metadata flush failed");
1566 }
1567 }
1568
1569 /* Flush all buffers before stopping */
1570 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1571 ret = kernel_flush_buffer(kchan);
1572 if (ret < 0) {
1573 ERR("Kernel flush buffer error");
1574 }
1575 }
1576
1577 ret = kernel_stop_session(ksession);
1578 if (ret < 0) {
1579 ret = LTTNG_ERR_KERN_STOP_FAIL;
1580 goto error;
1581 }
1582
1583 kernel_wait_quiescent(kernel_tracer_fd);
1584
1585 ksession->started = 0;
1586 }
1587
1588 if (usess) {
1589 usess->start_trace = 0;
1590
1591 ret = ust_app_stop_trace_all(usess);
1592 if (ret < 0) {
1593 ret = LTTNG_ERR_UST_STOP_FAIL;
1594 goto error;
1595 }
1596 }
1597
1598 session->started = 0;
1599
1600 ret = LTTNG_OK;
1601
1602error:
1603 return ret;
1604}
1605
1606/*
1607 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1608 */
1609int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1610 size_t nb_uri, struct lttng_uri *uris)
1611{
1612 int ret, i;
1613 struct ltt_kernel_session *ksess = session->kernel_session;
1614 struct ltt_ust_session *usess = session->ust_session;
1615 struct consumer_output *consumer = NULL;
1616
1617 assert(session);
1618 assert(uris);
1619 assert(nb_uri > 0);
1620
1621 /* Can't enable consumer after session started. */
1622 if (session->enabled) {
1623 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1624 goto error;
1625 }
1626
1627 /*
1628 * This case switch makes sure the domain session has a temporary consumer
1629 * so the URL can be set.
1630 */
1631 switch (domain) {
1632 case 0:
1633 /* Code flow error. A session MUST always have a consumer object */
1634 assert(session->consumer);
1635 /*
1636 * The URL will be added to the tracing session consumer instead of a
1637 * specific domain consumer.
1638 */
1639 consumer = session->consumer;
1640 break;
1641 case LTTNG_DOMAIN_KERNEL:
1642 /* Code flow error if we don't have a kernel session here. */
1643 assert(ksess);
1644 assert(ksess->consumer);
1645 consumer = ksess->consumer;
1646 break;
1647 case LTTNG_DOMAIN_UST:
1648 /* Code flow error if we don't have a kernel session here. */
1649 assert(usess);
1650 assert(usess->consumer);
1651 consumer = usess->consumer;
1652 break;
1653 }
1654
1655 for (i = 0; i < nb_uri; i++) {
1656 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1657 if (ret < 0) {
1658 goto error;
1659 }
1660 }
1661
1662 /* All good! */
1663 ret = LTTNG_OK;
1664
1665error:
1666 return ret;
1667}
1668
1669/*
1670 * Command LTTNG_CREATE_SESSION processed by the client thread.
1671 */
1672int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1673 size_t nb_uri, lttng_sock_cred *creds)
1674{
1675 int ret;
1676 char *path = NULL;
1677 struct ltt_session *session;
1678
1679 assert(name);
1680
1681 /* No URIs is not possible. */
1682 if (uris == NULL) {
1683 ret = LTTNG_ERR_SESSION_FAIL;
1684 goto session_error;
1685 }
1686
1687 /*
1688 * Verify if the session already exist
1689 *
1690 * XXX: There is no need for the session lock list here since the caller
1691 * (process_client_msg) is holding it. We might want to change that so a
1692 * single command does not lock the entire session list.
1693 */
1694 session = session_find_by_name(name);
1695 if (session != NULL) {
1696 ret = LTTNG_ERR_EXIST_SESS;
1697 goto find_error;
1698 }
1699
1700 /* Create tracing session in the registry */
1701 ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
1702 LTTNG_SOCK_GET_GID_CRED(creds));
1703 if (ret != LTTNG_OK) {
1704 goto session_error;
1705 }
1706
1707 /*
1708 * Get the newly created session pointer back
1709 *
1710 * XXX: There is no need for the session lock list here since the caller
1711 * (process_client_msg) is holding it. We might want to change that so a
1712 * single command does not lock the entire session list.
1713 */
1714 session = session_find_by_name(name);
1715 assert(session);
1716
1717 /* Create default consumer output for the session not yet created. */
1718 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1719 if (session->consumer == NULL) {
1720 ret = LTTNG_ERR_FATAL;
1721 goto consumer_error;
1722 }
1723
1724 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
1725 if (ret != LTTNG_OK) {
1726 goto consumer_error;
1727 }
1728
1729 session->consumer->enabled = 1;
1730
1731 return LTTNG_OK;
1732
1733consumer_error:
1734 session_destroy(session);
1735session_error:
1736find_error:
1737 return ret;
1738}
1739
1740/*
1741 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1742 */
1743int cmd_destroy_session(struct ltt_session *session, int wpipe)
1744{
1745 int ret;
1746 struct ltt_ust_session *usess;
1747 struct ltt_kernel_session *ksess;
1748
1749 /* Safety net */
1750 assert(session);
1751
1752 usess = session->ust_session;
1753 ksess = session->kernel_session;
1754
1755 /* Clean kernel session teardown */
1756 kernel_destroy_session(ksess);
1757
1758 /* UST session teardown */
1759 if (usess) {
1760 /* Close any relayd session */
1761 consumer_output_send_destroy_relayd(usess->consumer);
1762
1763 /* Destroy every UST application related to this session. */
1764 ret = ust_app_destroy_trace_all(usess);
1765 if (ret) {
1766 ERR("Error in ust_app_destroy_trace_all");
1767 }
1768
1769 /* Clean up the rest. */
1770 trace_ust_destroy_session(usess);
1771 }
1772
1773 /*
1774 * Must notify the kernel thread here to update it's poll set in order to
1775 * remove the channel(s)' fd just destroyed.
1776 */
1777 ret = notify_thread_pipe(wpipe);
1778 if (ret < 0) {
1779 PERROR("write kernel poll pipe");
1780 }
1781
1782 ret = session_destroy(session);
1783
1784 return ret;
1785}
1786
1787/*
1788 * Command LTTNG_CALIBRATE processed by the client thread.
1789 */
1790int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
1791{
1792 int ret;
1793
1794 switch (domain) {
1795 case LTTNG_DOMAIN_KERNEL:
1796 {
1797 struct lttng_kernel_calibrate kcalibrate;
1798
1799 kcalibrate.type = calibrate->type;
1800 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
1801 if (ret < 0) {
1802 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1803 goto error;
1804 }
1805 break;
1806 }
1807 case LTTNG_DOMAIN_UST:
1808 {
1809 struct lttng_ust_calibrate ucalibrate;
1810
1811 ucalibrate.type = calibrate->type;
1812 ret = ust_app_calibrate_glb(&ucalibrate);
1813 if (ret < 0) {
1814 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
1815 goto error;
1816 }
1817 break;
1818 }
1819 default:
1820 ret = LTTNG_ERR_UND;
1821 goto error;
1822 }
1823
1824 ret = LTTNG_OK;
1825
1826error:
1827 return ret;
1828}
1829
1830/*
1831 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1832 */
1833int cmd_register_consumer(struct ltt_session *session, int domain,
1834 const char *sock_path, struct consumer_data *cdata)
1835{
1836 int ret, sock;
1837 struct consumer_socket *socket;
1838
1839 assert(session);
1840 assert(cdata);
1841 assert(sock_path);
1842
1843 switch (domain) {
1844 case LTTNG_DOMAIN_KERNEL:
1845 {
1846 struct ltt_kernel_session *ksess = session->kernel_session;
1847
1848 assert(ksess);
1849
1850 /* Can't register a consumer if there is already one */
1851 if (ksess->consumer_fds_sent != 0) {
1852 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1853 goto error;
1854 }
1855
1856 sock = lttcomm_connect_unix_sock(sock_path);
1857 if (sock < 0) {
1858 ret = LTTNG_ERR_CONNECT_FAIL;
1859 goto error;
1860 }
1861
1862 socket = consumer_allocate_socket(sock);
1863 if (socket == NULL) {
1864 ret = close(sock);
1865 if (ret < 0) {
1866 PERROR("close register consumer");
1867 }
1868 ret = LTTNG_ERR_FATAL;
1869 goto error;
1870 }
1871
1872 socket->lock = zmalloc(sizeof(pthread_mutex_t));
1873 if (socket->lock == NULL) {
1874 PERROR("zmalloc pthread mutex");
1875 ret = LTTNG_ERR_FATAL;
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 */
1893 ret = LTTNG_ERR_UND;
1894 goto error;
1895 }
1896
1897 ret = LTTNG_OK;
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) {
1924 ret = LTTNG_ERR_FATAL;
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:
1941 /* Return negative value to differentiate return code */
1942 return -ret;
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);
1961 if (nb_chan <= 0) {
1962 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1963 }
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);
1971 if (nb_chan <= 0) {
1972 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1973 }
1974 break;
1975 default:
1976 *channels = NULL;
1977 ret = LTTNG_ERR_UND;
1978 goto error;
1979 }
1980
1981 if (nb_chan > 0) {
1982 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
1983 if (*channels == NULL) {
1984 ret = LTTNG_ERR_FATAL;
1985 goto error;
1986 }
1987
1988 list_lttng_channels(domain, session, *channels);
1989 } else {
1990 *channels = NULL;
1991 /* Ret value was set in the domain switch case */
1992 goto error;
1993 }
1994
1995 return nb_chan;
1996
1997error:
1998 /* Return negative value to differentiate return code */
1999 return -ret;
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:
2027 ret = LTTNG_ERR_UND;
2028 goto error;
2029 }
2030
2031 return nb_event;
2032
2033error:
2034 /* Return negative value to differentiate return code */
2035 return -ret;
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_DATA_PENDING returning 0 if the data is NOT pending meaning
2093 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2094 */
2095int cmd_data_pending(struct ltt_session *session)
2096{
2097 int ret;
2098 struct ltt_kernel_session *ksess = session->kernel_session;
2099 struct ltt_ust_session *usess = session->ust_session;
2100
2101 assert(session);
2102
2103 /* Session MUST be stopped to ask for data availability. */
2104 if (session->enabled) {
2105 ret = LTTNG_ERR_SESSION_STARTED;
2106 goto error;
2107 }
2108
2109 if (ksess && ksess->consumer) {
2110 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2111 if (ret == 1) {
2112 /* Data is still being extracted for the kernel. */
2113 goto error;
2114 }
2115 }
2116
2117 if (usess && usess->consumer) {
2118 ret = consumer_is_data_pending(usess->id, usess->consumer);
2119 if (ret == 1) {
2120 /* Data is still being extracted for the kernel. */
2121 goto error;
2122 }
2123 }
2124
2125 /* Data is ready to be read by a viewer */
2126 ret = 0;
2127
2128error:
2129 return ret;
2130}
2131
2132/*
2133 * Init command subsystem.
2134 */
2135void cmd_init(void)
2136{
2137 /*
2138 * Set network sequence index to 1 for streams to match a relayd
2139 * socket on the consumer side.
2140 */
2141 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2142 relayd_net_seq_idx = 1;
2143 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2144
2145 DBG("Command subsystem initialized");
2146}
LTTng tools - Deliverables
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