Fix: Enable event after start command
[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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DG
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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DG
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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DG
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;
2f77fc4b
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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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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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;
2f77fc4b
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;
2f77fc4b
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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
9b6c7ec5
DG
673/*
674 * Start a kernel session by opening all necessary streams.
675 */
676static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
677{
678 int ret;
679 struct ltt_kernel_channel *kchan;
680
681 /* Open kernel metadata */
682 if (ksess->metadata == NULL) {
683 ret = kernel_open_metadata(ksess);
684 if (ret < 0) {
685 ret = LTTNG_ERR_KERN_META_FAIL;
686 goto error;
687 }
688 }
689
690 /* Open kernel metadata stream */
691 if (ksess->metadata_stream_fd < 0) {
692 ret = kernel_open_metadata_stream(ksess);
693 if (ret < 0) {
694 ERR("Kernel create metadata stream failed");
695 ret = LTTNG_ERR_KERN_STREAM_FAIL;
696 goto error;
697 }
698 }
699
700 /* For each channel */
701 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
702 if (kchan->stream_count == 0) {
703 ret = kernel_open_channel_stream(kchan);
704 if (ret < 0) {
705 ret = LTTNG_ERR_KERN_STREAM_FAIL;
706 goto error;
707 }
708 /* Update the stream global counter */
709 ksess->stream_count_global += ret;
710 }
711 }
712
713 /* Setup kernel consumer socket and send fds to it */
714 ret = init_kernel_tracing(ksess);
715 if (ret < 0) {
716 ret = LTTNG_ERR_KERN_START_FAIL;
717 goto error;
718 }
719
720 /* This start the kernel tracing */
721 ret = kernel_start_session(ksess);
722 if (ret < 0) {
723 ret = LTTNG_ERR_KERN_START_FAIL;
724 goto error;
725 }
726
727 /* Quiescent wait after starting trace */
728 kernel_wait_quiescent(wpipe);
729
730 ksess->started = 1;
731
732 ret = LTTNG_OK;
733
734error:
735 return ret;
736}
737
2f77fc4b
DG
738/*
739 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
740 */
741int cmd_disable_channel(struct ltt_session *session, int domain,
742 char *channel_name)
743{
744 int ret;
745 struct ltt_ust_session *usess;
746
747 usess = session->ust_session;
748
749 switch (domain) {
750 case LTTNG_DOMAIN_KERNEL:
751 {
752 ret = channel_kernel_disable(session->kernel_session,
753 channel_name);
f73fabfd 754 if (ret != LTTNG_OK) {
2f77fc4b
DG
755 goto error;
756 }
757
758 kernel_wait_quiescent(kernel_tracer_fd);
759 break;
760 }
761 case LTTNG_DOMAIN_UST:
762 {
763 struct ltt_ust_channel *uchan;
764 struct lttng_ht *chan_ht;
765
766 chan_ht = usess->domain_global.channels;
767
768 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
769 if (uchan == NULL) {
f73fabfd 770 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
771 goto error;
772 }
773
774 ret = channel_ust_disable(usess, domain, uchan);
f73fabfd 775 if (ret != LTTNG_OK) {
2f77fc4b
DG
776 goto error;
777 }
778 break;
779 }
780#if 0
781 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
782 case LTTNG_DOMAIN_UST_EXEC_NAME:
783 case LTTNG_DOMAIN_UST_PID:
784#endif
785 default:
f73fabfd 786 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
787 goto error;
788 }
789
f73fabfd 790 ret = LTTNG_OK;
2f77fc4b
DG
791
792error:
793 return ret;
794}
795
796/*
797 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
798 *
799 * The wpipe arguments is used as a notifier for the kernel thread.
800 */
801int cmd_enable_channel(struct ltt_session *session,
802 int domain, struct lttng_channel *attr, int wpipe)
803{
804 int ret;
805 struct ltt_ust_session *usess = session->ust_session;
806 struct lttng_ht *chan_ht;
807
808 assert(session);
809 assert(attr);
810
811 DBG("Enabling channel %s for session %s", attr->name, session->name);
812
813 switch (domain) {
814 case LTTNG_DOMAIN_KERNEL:
815 {
816 struct ltt_kernel_channel *kchan;
817
818 /* Mandatory for a kernel channel. */
819 assert(wpipe > 0);
820
821 kchan = trace_kernel_get_channel_by_name(attr->name,
822 session->kernel_session);
823 if (kchan == NULL) {
824 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
825 } else {
826 ret = channel_kernel_enable(session->kernel_session, kchan);
827 }
828
f73fabfd 829 if (ret != LTTNG_OK) {
2f77fc4b
DG
830 goto error;
831 }
832
9b6c7ec5
DG
833 kernel_wait_quiescent(wpipe);
834
835 /*
836 * If the session was previously started, start as well this newly
837 * created kernel session so the events/channels enabled *after* the
838 * start actually work.
839 */
840 if (session->started && !session->kernel_session->started) {
841 ret = start_kernel_session(session->kernel_session, wpipe);
842 if (ret != LTTNG_OK) {
843 goto error;
844 }
845 }
2f77fc4b
DG
846 break;
847 }
848 case LTTNG_DOMAIN_UST:
849 {
850 struct ltt_ust_channel *uchan;
851
852 chan_ht = usess->domain_global.channels;
853
854 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
855 if (uchan == NULL) {
856 ret = channel_ust_create(usess, domain, attr);
857 } else {
858 ret = channel_ust_enable(usess, domain, uchan);
859 }
9b6c7ec5
DG
860
861 /* Start the UST session if the session was already started. */
862 if (session->started && !usess->start_trace) {
863 ret = ust_app_start_trace_all(usess);
864 if (ret < 0) {
865 ret = LTTNG_ERR_UST_START_FAIL;
866 goto error;
867 }
868 ret = LTTNG_OK;
869 usess->start_trace = 1;
870 }
2f77fc4b
DG
871 break;
872 }
873#if 0
874 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
875 case LTTNG_DOMAIN_UST_EXEC_NAME:
876 case LTTNG_DOMAIN_UST_PID:
877#endif
878 default:
f73fabfd 879 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
880 goto error;
881 }
882
883error:
884 return ret;
885}
886
887
888/*
889 * Command LTTNG_DISABLE_EVENT processed by the client thread.
890 */
891int cmd_disable_event(struct ltt_session *session, int domain,
892 char *channel_name, char *event_name)
893{
894 int ret;
895
896 switch (domain) {
897 case LTTNG_DOMAIN_KERNEL:
898 {
899 struct ltt_kernel_channel *kchan;
900 struct ltt_kernel_session *ksess;
901
902 ksess = session->kernel_session;
903
904 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
905 if (kchan == NULL) {
f73fabfd 906 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
907 goto error;
908 }
909
910 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
f73fabfd 911 if (ret != LTTNG_OK) {
2f77fc4b
DG
912 goto error;
913 }
914
915 kernel_wait_quiescent(kernel_tracer_fd);
916 break;
917 }
918 case LTTNG_DOMAIN_UST:
919 {
920 struct ltt_ust_channel *uchan;
921 struct ltt_ust_session *usess;
922
923 usess = session->ust_session;
924
925 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
926 channel_name);
927 if (uchan == NULL) {
f73fabfd 928 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
929 goto error;
930 }
931
932 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
f73fabfd 933 if (ret != LTTNG_OK) {
2f77fc4b
DG
934 goto error;
935 }
936
937 DBG3("Disable UST event %s in channel %s completed", event_name,
938 channel_name);
939 break;
940 }
941#if 0
942 case LTTNG_DOMAIN_UST_EXEC_NAME:
943 case LTTNG_DOMAIN_UST_PID:
944 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
945#endif
946 default:
f73fabfd 947 ret = LTTNG_ERR_UND;
2f77fc4b
DG
948 goto error;
949 }
950
f73fabfd 951 ret = LTTNG_OK;
2f77fc4b
DG
952
953error:
954 return ret;
955}
956
957/*
958 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
959 */
960int cmd_disable_event_all(struct ltt_session *session, int domain,
961 char *channel_name)
962{
963 int ret;
964
965 switch (domain) {
966 case LTTNG_DOMAIN_KERNEL:
967 {
968 struct ltt_kernel_session *ksess;
969 struct ltt_kernel_channel *kchan;
970
971 ksess = session->kernel_session;
972
973 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
974 if (kchan == NULL) {
f73fabfd 975 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
976 goto error;
977 }
978
979 ret = event_kernel_disable_all(ksess, kchan);
f73fabfd 980 if (ret != LTTNG_OK) {
2f77fc4b
DG
981 goto error;
982 }
983
984 kernel_wait_quiescent(kernel_tracer_fd);
985 break;
986 }
987 case LTTNG_DOMAIN_UST:
988 {
989 struct ltt_ust_session *usess;
990 struct ltt_ust_channel *uchan;
991
992 usess = session->ust_session;
993
994 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
995 channel_name);
996 if (uchan == NULL) {
f73fabfd 997 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
998 goto error;
999 }
1000
1001 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
1002 if (ret != 0) {
1003 goto error;
1004 }
1005
1006 DBG3("Disable all UST events in channel %s completed", channel_name);
1007
1008 break;
1009 }
1010#if 0
1011 case LTTNG_DOMAIN_UST_EXEC_NAME:
1012 case LTTNG_DOMAIN_UST_PID:
1013 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1014#endif
1015 default:
f73fabfd 1016 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1017 goto error;
1018 }
1019
f73fabfd 1020 ret = LTTNG_OK;
2f77fc4b
DG
1021
1022error:
1023 return ret;
1024}
1025
1026/*
1027 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1028 */
1029int cmd_add_context(struct ltt_session *session, int domain,
979e618e
DG
1030 char *channel_name, char *event_name, struct lttng_event_context *ctx,
1031 int kwpipe)
2f77fc4b
DG
1032{
1033 int ret;
1034
1035 switch (domain) {
1036 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
1037 assert(session->kernel_session);
1038
1039 if (session->kernel_session->channel_count == 0) {
1040 /* Create default channel */
1041 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1042 if (ret != LTTNG_OK) {
1043 goto error;
1044 }
1045 }
1046
2f77fc4b
DG
1047 /* Add kernel context to kernel tracer */
1048 ret = context_kernel_add(session->kernel_session, ctx,
1049 event_name, channel_name);
f73fabfd 1050 if (ret != LTTNG_OK) {
2f77fc4b
DG
1051 goto error;
1052 }
1053 break;
1054 case LTTNG_DOMAIN_UST:
1055 {
1056 struct ltt_ust_session *usess = session->ust_session;
2f77fc4b
DG
1057 assert(usess);
1058
979e618e
DG
1059 unsigned int chan_count =
1060 lttng_ht_get_count(usess->domain_global.channels);
1061 if (chan_count == 0) {
1062 struct lttng_channel *attr;
1063 /* Create default channel */
1064 attr = channel_new_default_attr(domain);
1065 if (attr == NULL) {
1066 ret = LTTNG_ERR_FATAL;
1067 goto error;
1068 }
1069
1070 ret = channel_ust_create(usess, domain, attr);
1071 if (ret != LTTNG_OK) {
1072 free(attr);
1073 goto error;
1074 }
1075 free(attr);
1076 }
1077
1078
2f77fc4b 1079 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
f73fabfd 1080 if (ret != LTTNG_OK) {
2f77fc4b
DG
1081 goto error;
1082 }
1083 break;
1084 }
1085#if 0
1086 case LTTNG_DOMAIN_UST_EXEC_NAME:
1087 case LTTNG_DOMAIN_UST_PID:
1088 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1089#endif
1090 default:
f73fabfd 1091 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1092 goto error;
1093 }
1094
f73fabfd 1095 ret = LTTNG_OK;
2f77fc4b
DG
1096
1097error:
1098 return ret;
1099}
1100
1101/*
1102 * Command LTTNG_SET_FILTER processed by the client thread.
1103 */
1104int cmd_set_filter(struct ltt_session *session, int domain,
1105 char *channel_name, char *event_name,
1106 struct lttng_filter_bytecode *bytecode)
1107{
1108 int ret;
1109
1110 switch (domain) {
1111 case LTTNG_DOMAIN_KERNEL:
f73fabfd 1112 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1113 break;
1114 case LTTNG_DOMAIN_UST:
1115 {
1116 struct ltt_ust_session *usess = session->ust_session;
1117
1118 ret = filter_ust_set(usess, domain, bytecode, event_name, channel_name);
f73fabfd 1119 if (ret != LTTNG_OK) {
2f77fc4b
DG
1120 goto error;
1121 }
1122 break;
1123 }
1124#if 0
1125 case LTTNG_DOMAIN_UST_EXEC_NAME:
1126 case LTTNG_DOMAIN_UST_PID:
1127 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1128#endif
1129 default:
f73fabfd 1130 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1131 goto error;
1132 }
1133
f73fabfd 1134 ret = LTTNG_OK;
2f77fc4b
DG
1135
1136error:
1137 return ret;
1138
1139}
1140
1141
1142/*
1143 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1144 */
1145int cmd_enable_event(struct ltt_session *session, int domain,
1146 char *channel_name, struct lttng_event *event, int wpipe)
1147{
1148 int ret;
1149 struct lttng_channel *attr;
1150
1151 assert(session);
1152 assert(event);
1153 assert(channel_name);
1154
1155 switch (domain) {
1156 case LTTNG_DOMAIN_KERNEL:
1157 {
1158 struct ltt_kernel_channel *kchan;
1159
1160 kchan = trace_kernel_get_channel_by_name(channel_name,
1161 session->kernel_session);
1162 if (kchan == NULL) {
1163 attr = channel_new_default_attr(domain);
1164 if (attr == NULL) {
f73fabfd 1165 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1166 goto error;
1167 }
1168 strncpy(attr->name, channel_name, sizeof(attr->name));
1169
1170 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1171 if (ret != LTTNG_OK) {
2f77fc4b
DG
1172 free(attr);
1173 goto error;
1174 }
1175 free(attr);
1176 }
1177
1178 /* Get the newly created kernel channel pointer */
1179 kchan = trace_kernel_get_channel_by_name(channel_name,
1180 session->kernel_session);
1181 if (kchan == NULL) {
1182 /* This sould not happen... */
f73fabfd 1183 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1184 goto error;
1185 }
1186
1187 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
1188 event);
f73fabfd 1189 if (ret != LTTNG_OK) {
2f77fc4b
DG
1190 goto error;
1191 }
1192
1193 kernel_wait_quiescent(kernel_tracer_fd);
1194 break;
1195 }
1196 case LTTNG_DOMAIN_UST:
1197 {
1198 struct ltt_ust_channel *uchan;
1199 struct ltt_ust_session *usess = session->ust_session;
1200
1201 assert(usess);
1202
1203 /* Get channel from global UST domain */
1204 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1205 channel_name);
1206 if (uchan == NULL) {
1207 /* Create default channel */
1208 attr = channel_new_default_attr(domain);
1209 if (attr == NULL) {
f73fabfd 1210 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1211 goto error;
1212 }
1213 strncpy(attr->name, channel_name, sizeof(attr->name));
1214
1215 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1216 if (ret != LTTNG_OK) {
2f77fc4b
DG
1217 free(attr);
1218 goto error;
1219 }
1220 free(attr);
1221
1222 /* Get the newly created channel reference back */
1223 uchan = trace_ust_find_channel_by_name(
1224 usess->domain_global.channels, channel_name);
1225 assert(uchan);
1226 }
1227
1228 /* At this point, the session and channel exist on the tracer */
1229 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
f73fabfd 1230 if (ret != LTTNG_OK) {
2f77fc4b
DG
1231 goto error;
1232 }
1233 break;
1234 }
1235#if 0
1236 case LTTNG_DOMAIN_UST_EXEC_NAME:
1237 case LTTNG_DOMAIN_UST_PID:
1238 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1239#endif
1240 default:
f73fabfd 1241 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1242 goto error;
1243 }
1244
f73fabfd 1245 ret = LTTNG_OK;
2f77fc4b
DG
1246
1247error:
1248 return ret;
1249}
1250
1251/*
1252 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1253 */
1254int cmd_enable_event_all(struct ltt_session *session, int domain,
1255 char *channel_name, int event_type, int wpipe)
1256{
1257 int ret;
1258 struct lttng_channel *attr;
1259
1260 assert(session);
1261 assert(channel_name);
1262
1263 switch (domain) {
1264 case LTTNG_DOMAIN_KERNEL:
1265 {
1266 struct ltt_kernel_channel *kchan;
1267
1268 assert(session->kernel_session);
1269
1270 kchan = trace_kernel_get_channel_by_name(channel_name,
1271 session->kernel_session);
1272 if (kchan == NULL) {
1273 /* Create default channel */
1274 attr = channel_new_default_attr(domain);
1275 if (attr == NULL) {
f73fabfd 1276 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1277 goto error;
1278 }
1279 strncpy(attr->name, channel_name, sizeof(attr->name));
1280
1281 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1282 if (ret != LTTNG_OK) {
2f77fc4b
DG
1283 free(attr);
1284 goto error;
1285 }
1286 free(attr);
1287
1288 /* Get the newly created kernel channel pointer */
1289 kchan = trace_kernel_get_channel_by_name(channel_name,
1290 session->kernel_session);
1291 assert(kchan);
1292 }
1293
1294 switch (event_type) {
1295 case LTTNG_EVENT_SYSCALL:
1296 ret = event_kernel_enable_all_syscalls(session->kernel_session,
1297 kchan, kernel_tracer_fd);
1298 break;
1299 case LTTNG_EVENT_TRACEPOINT:
1300 /*
1301 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1302 * events already registered to the channel.
1303 */
1304 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
1305 kchan, kernel_tracer_fd);
1306 break;
1307 case LTTNG_EVENT_ALL:
1308 /* Enable syscalls and tracepoints */
1309 ret = event_kernel_enable_all(session->kernel_session,
1310 kchan, kernel_tracer_fd);
1311 break;
1312 default:
f73fabfd 1313 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2f77fc4b
DG
1314 goto error;
1315 }
1316
1317 /* Manage return value */
f73fabfd 1318 if (ret != LTTNG_OK) {
2f77fc4b
DG
1319 goto error;
1320 }
1321
1322 kernel_wait_quiescent(kernel_tracer_fd);
1323 break;
1324 }
1325 case LTTNG_DOMAIN_UST:
1326 {
1327 struct ltt_ust_channel *uchan;
1328 struct ltt_ust_session *usess = session->ust_session;
1329
1330 assert(usess);
1331
1332 /* Get channel from global UST domain */
1333 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1334 channel_name);
1335 if (uchan == NULL) {
1336 /* Create default channel */
1337 attr = channel_new_default_attr(domain);
1338 if (attr == NULL) {
f73fabfd 1339 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1340 goto error;
1341 }
1342 strncpy(attr->name, channel_name, sizeof(attr->name));
1343
1344 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1345 if (ret != LTTNG_OK) {
2f77fc4b
DG
1346 free(attr);
1347 goto error;
1348 }
1349 free(attr);
1350
1351 /* Get the newly created channel reference back */
1352 uchan = trace_ust_find_channel_by_name(
1353 usess->domain_global.channels, channel_name);
1354 assert(uchan);
1355 }
1356
1357 /* At this point, the session and channel exist on the tracer */
1358
1359 switch (event_type) {
1360 case LTTNG_EVENT_ALL:
1361 case LTTNG_EVENT_TRACEPOINT:
1362 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
f73fabfd 1363 if (ret != LTTNG_OK) {
2f77fc4b
DG
1364 goto error;
1365 }
1366 break;
1367 default:
f73fabfd 1368 ret = LTTNG_ERR_UST_ENABLE_FAIL;
2f77fc4b
DG
1369 goto error;
1370 }
1371
1372 /* Manage return value */
f73fabfd 1373 if (ret != LTTNG_OK) {
2f77fc4b
DG
1374 goto error;
1375 }
1376
1377 break;
1378 }
1379#if 0
1380 case LTTNG_DOMAIN_UST_EXEC_NAME:
1381 case LTTNG_DOMAIN_UST_PID:
1382 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1383#endif
1384 default:
f73fabfd 1385 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1386 goto error;
1387 }
1388
f73fabfd 1389 ret = LTTNG_OK;
2f77fc4b
DG
1390
1391error:
1392 return ret;
1393}
1394
1395
1396/*
1397 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1398 */
1399ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1400{
1401 int ret;
1402 ssize_t nb_events = 0;
1403
1404 switch (domain) {
1405 case LTTNG_DOMAIN_KERNEL:
1406 nb_events = kernel_list_events(kernel_tracer_fd, events);
1407 if (nb_events < 0) {
f73fabfd 1408 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
1409 goto error;
1410 }
1411 break;
1412 case LTTNG_DOMAIN_UST:
1413 nb_events = ust_app_list_events(events);
1414 if (nb_events < 0) {
f73fabfd 1415 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
1416 goto error;
1417 }
1418 break;
1419 default:
f73fabfd 1420 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1421 goto error;
1422 }
1423
1424 return nb_events;
1425
1426error:
1427 /* Return negative value to differentiate return code */
1428 return -ret;
1429}
1430
1431/*
1432 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1433 */
1434ssize_t cmd_list_tracepoint_fields(int domain,
1435 struct lttng_event_field **fields)
1436{
1437 int ret;
1438 ssize_t nb_fields = 0;
1439
1440 switch (domain) {
1441 case LTTNG_DOMAIN_UST:
1442 nb_fields = ust_app_list_event_fields(fields);
1443 if (nb_fields < 0) {
f73fabfd 1444 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
1445 goto error;
1446 }
1447 break;
1448 case LTTNG_DOMAIN_KERNEL:
1449 default: /* fall-through */
f73fabfd 1450 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1451 goto error;
1452 }
1453
1454 return nb_fields;
1455
1456error:
1457 /* Return negative value to differentiate return code */
1458 return -ret;
1459}
1460
1461/*
1462 * Command LTTNG_START_TRACE processed by the client thread.
1463 */
1464int cmd_start_trace(struct ltt_session *session)
1465{
1466 int ret;
1467 struct ltt_kernel_session *ksession;
1468 struct ltt_ust_session *usess;
2f77fc4b
DG
1469
1470 assert(session);
1471
1472 /* Ease our life a bit ;) */
1473 ksession = session->kernel_session;
1474 usess = session->ust_session;
1475
1476 if (session->enabled) {
1477 /* Already started. */
f73fabfd 1478 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
1479 goto error;
1480 }
1481
1482 session->enabled = 1;
1483
1484 ret = setup_relayd(session);
f73fabfd 1485 if (ret != LTTNG_OK) {
2f77fc4b
DG
1486 ERR("Error setting up relayd for session %s", session->name);
1487 goto error;
1488 }
1489
1490 /* Kernel tracing */
1491 if (ksession != NULL) {
9b6c7ec5
DG
1492 ret = start_kernel_session(ksession, kernel_tracer_fd);
1493 if (ret != LTTNG_OK) {
2f77fc4b
DG
1494 goto error;
1495 }
2f77fc4b
DG
1496 }
1497
1498 /* Flag session that trace should start automatically */
1499 if (usess) {
1500 usess->start_trace = 1;
1501
1502 ret = ust_app_start_trace_all(usess);
1503 if (ret < 0) {
f73fabfd 1504 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
1505 goto error;
1506 }
1507 }
1508
9b6c7ec5
DG
1509 session->started = 1;
1510
f73fabfd 1511 ret = LTTNG_OK;
2f77fc4b
DG
1512
1513error:
1514 return ret;
1515}
1516
1517/*
1518 * Command LTTNG_STOP_TRACE processed by the client thread.
1519 */
1520int cmd_stop_trace(struct ltt_session *session)
1521{
1522 int ret;
1523 struct ltt_kernel_channel *kchan;
1524 struct ltt_kernel_session *ksession;
1525 struct ltt_ust_session *usess;
1526
1527 assert(session);
1528
1529 /* Short cut */
1530 ksession = session->kernel_session;
1531 usess = session->ust_session;
1532
1533 if (!session->enabled) {
f73fabfd 1534 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
1535 goto error;
1536 }
1537
1538 session->enabled = 0;
1539
1540 /* Kernel tracer */
1541 if (ksession) {
1542 DBG("Stop kernel tracing");
1543
1544 /* Flush metadata if exist */
1545 if (ksession->metadata_stream_fd >= 0) {
1546 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1547 if (ret < 0) {
1548 ERR("Kernel metadata flush failed");
1549 }
1550 }
1551
1552 /* Flush all buffers before stopping */
1553 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1554 ret = kernel_flush_buffer(kchan);
1555 if (ret < 0) {
1556 ERR("Kernel flush buffer error");
1557 }
1558 }
1559
1560 ret = kernel_stop_session(ksession);
1561 if (ret < 0) {
f73fabfd 1562 ret = LTTNG_ERR_KERN_STOP_FAIL;
2f77fc4b
DG
1563 goto error;
1564 }
1565
1566 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5
DG
1567
1568 ksession->started = 0;
2f77fc4b
DG
1569 }
1570
1571 if (usess) {
1572 usess->start_trace = 0;
1573
1574 ret = ust_app_stop_trace_all(usess);
1575 if (ret < 0) {
f73fabfd 1576 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
1577 goto error;
1578 }
1579 }
1580
9b6c7ec5
DG
1581 session->started = 0;
1582
f73fabfd 1583 ret = LTTNG_OK;
2f77fc4b
DG
1584
1585error:
1586 return ret;
1587}
1588
1589/*
1590 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1591 */
1592int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1593 size_t nb_uri, struct lttng_uri *uris)
1594{
1595 int ret, i;
1596 struct ltt_kernel_session *ksess = session->kernel_session;
1597 struct ltt_ust_session *usess = session->ust_session;
1598 struct consumer_output *consumer = NULL;
1599
1600 assert(session);
1601 assert(uris);
1602 assert(nb_uri > 0);
1603
1604 /* Can't enable consumer after session started. */
1605 if (session->enabled) {
f73fabfd 1606 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
1607 goto error;
1608 }
1609
2f77fc4b
DG
1610 /*
1611 * This case switch makes sure the domain session has a temporary consumer
1612 * so the URL can be set.
1613 */
1614 switch (domain) {
1615 case 0:
1616 /* Code flow error. A session MUST always have a consumer object */
1617 assert(session->consumer);
1618 /*
1619 * The URL will be added to the tracing session consumer instead of a
1620 * specific domain consumer.
1621 */
1622 consumer = session->consumer;
1623 break;
1624 case LTTNG_DOMAIN_KERNEL:
1625 /* Code flow error if we don't have a kernel session here. */
1626 assert(ksess);
1627
1628 /* Create consumer output if none exists */
1629 consumer = ksess->tmp_consumer;
1630 if (consumer == NULL) {
1631 consumer = consumer_copy_output(ksess->consumer);
1632 if (consumer == NULL) {
f73fabfd 1633 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1634 goto error;
1635 }
1636 /* Trash the consumer subdir, we are about to set a new one. */
1637 memset(consumer->subdir, 0, sizeof(consumer->subdir));
1638 ksess->tmp_consumer = consumer;
1639 }
1640
1641 break;
1642 case LTTNG_DOMAIN_UST:
1643 /* Code flow error if we don't have a kernel session here. */
1644 assert(usess);
1645
1646 /* Create consumer output if none exists */
1647 consumer = usess->tmp_consumer;
1648 if (consumer == NULL) {
1649 consumer = consumer_copy_output(usess->consumer);
1650 if (consumer == NULL) {
f73fabfd 1651 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1652 goto error;
1653 }
1654 /* Trash the consumer subdir, we are about to set a new one. */
1655 memset(consumer->subdir, 0, sizeof(consumer->subdir));
1656 usess->tmp_consumer = consumer;
1657 }
1658
1659 break;
1660 }
1661
1662 for (i = 0; i < nb_uri; i++) {
1663 struct consumer_socket *socket;
1664 struct lttng_ht_iter iter;
1665
1666 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1667 if (ret < 0) {
1668 goto error;
1669 }
1670
1671 /*
1672 * Don't send relayd socket if URI is NOT remote or if the relayd
c890b720 1673 * socket for the session was already sent.
2f77fc4b
DG
1674 */
1675 if (uris[i].dtype == LTTNG_DST_PATH ||
c890b720
DG
1676 (uris[i].stype == LTTNG_STREAM_CONTROL &&
1677 consumer->dst.net.control_sock_sent) ||
1678 (uris[i].stype == LTTNG_STREAM_DATA &&
1679 consumer->dst.net.data_sock_sent)) {
2f77fc4b
DG
1680 continue;
1681 }
1682
1683 /* Try to send relayd URI to the consumer if exist. */
1684 rcu_read_lock();
1685 cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter,
1686 socket, node.node) {
1687
1688 /* A socket in the HT should never have a negative fd */
1689 assert(socket->fd >= 0);
1690
1691 pthread_mutex_lock(socket->lock);
1692 ret = send_consumer_relayd_socket(domain, session, &uris[i],
1693 consumer, socket->fd);
1694 pthread_mutex_unlock(socket->lock);
f73fabfd 1695 if (ret != LTTNG_OK) {
2f77fc4b
DG
1696 rcu_read_unlock();
1697 goto error;
1698 }
1699 }
1700 rcu_read_unlock();
1701 }
1702
1703 /* All good! */
f73fabfd 1704 ret = LTTNG_OK;
2f77fc4b
DG
1705
1706error:
1707 return ret;
1708}
1709
1710/*
1711 * Command LTTNG_CREATE_SESSION processed by the client thread.
1712 */
1713int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1714 size_t nb_uri, lttng_sock_cred *creds)
1715{
1716 int ret;
1717 char *path = NULL;
1718 struct ltt_session *session;
1719
1720 assert(name);
1721
1722 /*
1723 * Verify if the session already exist
1724 *
1725 * XXX: There is no need for the session lock list here since the caller
1726 * (process_client_msg) is holding it. We might want to change that so a
1727 * single command does not lock the entire session list.
1728 */
1729 session = session_find_by_name(name);
1730 if (session != NULL) {
f73fabfd 1731 ret = LTTNG_ERR_EXIST_SESS;
2f77fc4b
DG
1732 goto find_error;
1733 }
1734
1735 /* Create tracing session in the registry */
1736 ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
1737 LTTNG_SOCK_GET_GID_CRED(creds));
f73fabfd 1738 if (ret != LTTNG_OK) {
2f77fc4b
DG
1739 goto session_error;
1740 }
1741
1742 /*
1743 * Get the newly created session pointer back
1744 *
1745 * XXX: There is no need for the session lock list here since the caller
1746 * (process_client_msg) is holding it. We might want to change that so a
1747 * single command does not lock the entire session list.
1748 */
1749 session = session_find_by_name(name);
1750 assert(session);
1751
1752 /* Create default consumer output for the session not yet created. */
1753 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1754 if (session->consumer == NULL) {
f73fabfd 1755 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1756 goto consumer_error;
1757 }
1758
1759 /*
1760 * This means that the lttng_create_session call was called with the _path_
1761 * argument set to NULL.
1762 */
1763 if (uris == NULL) {
1764 /*
1765 * At this point, we'll skip the consumer URI setup and create a
1766 * session with a NULL path which will flag the session to NOT spawn a
1767 * consumer.
1768 */
1769 DBG("Create session %s with NO uri, skipping consumer setup", name);
1770 goto end;
1771 }
1772
1773 session->start_consumer = 1;
1774
1775 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
f73fabfd 1776 if (ret != LTTNG_OK) {
2f77fc4b
DG
1777 goto consumer_error;
1778 }
1779
1780 session->consumer->enabled = 1;
1781
1782end:
f73fabfd 1783 return LTTNG_OK;
2f77fc4b
DG
1784
1785consumer_error:
1786 session_destroy(session);
1787session_error:
1788find_error:
1789 return ret;
1790}
1791
1792/*
1793 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1794 */
1795int cmd_destroy_session(struct ltt_session *session, int wpipe)
1796{
1797 int ret;
1798 struct ltt_ust_session *usess;
1799 struct ltt_kernel_session *ksess;
1800
1801 /* Safety net */
1802 assert(session);
1803
1804 usess = session->ust_session;
1805 ksess = session->kernel_session;
1806
1807 /* Clean kernel session teardown */
1808 kernel_destroy_session(ksess);
1809
1810 /* UST session teardown */
1811 if (usess) {
1812 /* Close any relayd session */
1813 consumer_output_send_destroy_relayd(usess->consumer);
1814
1815 /* Destroy every UST application related to this session. */
1816 ret = ust_app_destroy_trace_all(usess);
1817 if (ret) {
1818 ERR("Error in ust_app_destroy_trace_all");
1819 }
1820
1821 /* Clean up the rest. */
1822 trace_ust_destroy_session(usess);
1823 }
1824
1825 /*
1826 * Must notify the kernel thread here to update it's poll set in order to
1827 * remove the channel(s)' fd just destroyed.
1828 */
1829 ret = notify_thread_pipe(wpipe);
1830 if (ret < 0) {
1831 PERROR("write kernel poll pipe");
1832 }
1833
1834 ret = session_destroy(session);
1835
1836 return ret;
1837}
1838
1839/*
1840 * Command LTTNG_CALIBRATE processed by the client thread.
1841 */
1842int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
1843{
1844 int ret;
1845
1846 switch (domain) {
1847 case LTTNG_DOMAIN_KERNEL:
1848 {
1849 struct lttng_kernel_calibrate kcalibrate;
1850
1851 kcalibrate.type = calibrate->type;
1852 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
1853 if (ret < 0) {
f73fabfd 1854 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2f77fc4b
DG
1855 goto error;
1856 }
1857 break;
1858 }
1859 case LTTNG_DOMAIN_UST:
1860 {
1861 struct lttng_ust_calibrate ucalibrate;
1862
1863 ucalibrate.type = calibrate->type;
1864 ret = ust_app_calibrate_glb(&ucalibrate);
1865 if (ret < 0) {
f73fabfd 1866 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2f77fc4b
DG
1867 goto error;
1868 }
1869 break;
1870 }
1871 default:
f73fabfd 1872 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1873 goto error;
1874 }
1875
f73fabfd 1876 ret = LTTNG_OK;
2f77fc4b
DG
1877
1878error:
1879 return ret;
1880}
1881
1882/*
1883 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1884 */
1885int cmd_register_consumer(struct ltt_session *session, int domain,
1886 const char *sock_path, struct consumer_data *cdata)
1887{
1888 int ret, sock;
1889 struct consumer_socket *socket;
1890
1891 assert(session);
1892 assert(cdata);
1893 assert(sock_path);
1894
1895 switch (domain) {
1896 case LTTNG_DOMAIN_KERNEL:
1897 {
1898 struct ltt_kernel_session *ksess = session->kernel_session;
1899
1900 assert(ksess);
1901
1902 /* Can't register a consumer if there is already one */
1903 if (ksess->consumer_fds_sent != 0) {
f73fabfd 1904 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
1905 goto error;
1906 }
1907
1908 sock = lttcomm_connect_unix_sock(sock_path);
1909 if (sock < 0) {
f73fabfd 1910 ret = LTTNG_ERR_CONNECT_FAIL;
2f77fc4b
DG
1911 goto error;
1912 }
1913
1914 socket = consumer_allocate_socket(sock);
1915 if (socket == NULL) {
f73fabfd 1916 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1917 close(sock);
1918 goto error;
1919 }
1920
1921 socket->lock = zmalloc(sizeof(pthread_mutex_t));
1922 if (socket->lock == NULL) {
1923 PERROR("zmalloc pthread mutex");
f73fabfd 1924 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1925 goto error;
1926 }
1927 pthread_mutex_init(socket->lock, NULL);
1928 socket->registered = 1;
1929
1930 rcu_read_lock();
1931 consumer_add_socket(socket, ksess->consumer);
1932 rcu_read_unlock();
1933
1934 pthread_mutex_lock(&cdata->pid_mutex);
1935 cdata->pid = -1;
1936 pthread_mutex_unlock(&cdata->pid_mutex);
1937
1938 break;
1939 }
1940 default:
1941 /* TODO: Userspace tracing */
f73fabfd 1942 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1943 goto error;
1944 }
1945
f73fabfd 1946 ret = LTTNG_OK;
2f77fc4b
DG
1947
1948error:
1949 return ret;
1950}
1951
1952/*
1953 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1954 */
1955ssize_t cmd_list_domains(struct ltt_session *session,
1956 struct lttng_domain **domains)
1957{
1958 int ret, index = 0;
1959 ssize_t nb_dom = 0;
1960
1961 if (session->kernel_session != NULL) {
1962 DBG3("Listing domains found kernel domain");
1963 nb_dom++;
1964 }
1965
1966 if (session->ust_session != NULL) {
1967 DBG3("Listing domains found UST global domain");
1968 nb_dom++;
1969 }
1970
1971 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
1972 if (*domains == NULL) {
f73fabfd 1973 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1974 goto error;
1975 }
1976
1977 if (session->kernel_session != NULL) {
1978 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
1979 index++;
1980 }
1981
1982 if (session->ust_session != NULL) {
1983 (*domains)[index].type = LTTNG_DOMAIN_UST;
1984 index++;
1985 }
1986
1987 return nb_dom;
1988
1989error:
f73fabfd
DG
1990 /* Return negative value to differentiate return code */
1991 return -ret;
2f77fc4b
DG
1992}
1993
1994
1995/*
1996 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1997 */
1998ssize_t cmd_list_channels(int domain, struct ltt_session *session,
1999 struct lttng_channel **channels)
2000{
2001 int ret;
2002 ssize_t nb_chan = 0;
2003
2004 switch (domain) {
2005 case LTTNG_DOMAIN_KERNEL:
2006 if (session->kernel_session != NULL) {
2007 nb_chan = session->kernel_session->channel_count;
2008 }
2009 DBG3("Number of kernel channels %zd", nb_chan);
c7d620a2
DG
2010 if (nb_chan <= 0) {
2011 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2012 }
2f77fc4b
DG
2013 break;
2014 case LTTNG_DOMAIN_UST:
2015 if (session->ust_session != NULL) {
2016 nb_chan = lttng_ht_get_count(
2017 session->ust_session->domain_global.channels);
2018 }
2019 DBG3("Number of UST global channels %zd", nb_chan);
c7d620a2
DG
2020 if (nb_chan <= 0) {
2021 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2022 }
2f77fc4b
DG
2023 break;
2024 default:
2025 *channels = NULL;
f73fabfd 2026 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2027 goto error;
2028 }
2029
2030 if (nb_chan > 0) {
2031 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2032 if (*channels == NULL) {
f73fabfd 2033 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2034 goto error;
2035 }
2036
2037 list_lttng_channels(domain, session, *channels);
2038 } else {
2039 *channels = NULL;
c7d620a2
DG
2040 /* Ret value was set in the domain switch case */
2041 goto error;
2f77fc4b
DG
2042 }
2043
2044 return nb_chan;
2045
2046error:
f73fabfd
DG
2047 /* Return negative value to differentiate return code */
2048 return -ret;
2f77fc4b
DG
2049}
2050
2051/*
2052 * Command LTTNG_LIST_EVENTS processed by the client thread.
2053 */
2054ssize_t cmd_list_events(int domain, struct ltt_session *session,
2055 char *channel_name, struct lttng_event **events)
2056{
2057 int ret = 0;
2058 ssize_t nb_event = 0;
2059
2060 switch (domain) {
2061 case LTTNG_DOMAIN_KERNEL:
2062 if (session->kernel_session != NULL) {
2063 nb_event = list_lttng_kernel_events(channel_name,
2064 session->kernel_session, events);
2065 }
2066 break;
2067 case LTTNG_DOMAIN_UST:
2068 {
2069 if (session->ust_session != NULL) {
2070 nb_event = list_lttng_ust_global_events(channel_name,
2071 &session->ust_session->domain_global, events);
2072 }
2073 break;
2074 }
2075 default:
f73fabfd 2076 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2077 goto error;
2078 }
2079
f73fabfd 2080 return nb_event;
2f77fc4b
DG
2081
2082error:
f73fabfd
DG
2083 /* Return negative value to differentiate return code */
2084 return -ret;
2f77fc4b
DG
2085}
2086
2087/*
2088 * Using the session list, filled a lttng_session array to send back to the
2089 * client for session listing.
2090 *
2091 * The session list lock MUST be acquired before calling this function. Use
2092 * session_lock_list() and session_unlock_list().
2093 */
2094void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2095 gid_t gid)
2096{
2097 int ret;
2098 unsigned int i = 0;
2099 struct ltt_session *session;
2100 struct ltt_session_list *list = session_get_list();
2101
2102 DBG("Getting all available session for UID %d GID %d",
2103 uid, gid);
2104 /*
2105 * Iterate over session list and append data after the control struct in
2106 * the buffer.
2107 */
2108 cds_list_for_each_entry(session, &list->head, list) {
2109 /*
2110 * Only list the sessions the user can control.
2111 */
2112 if (!session_access_ok(session, uid, gid)) {
2113 continue;
2114 }
2115
2116 struct ltt_kernel_session *ksess = session->kernel_session;
2117 struct ltt_ust_session *usess = session->ust_session;
2118
2119 if (session->consumer->type == CONSUMER_DST_NET ||
2120 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2121 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2122 ret = build_network_session_path(sessions[i].path,
2123 sizeof(session[i].path), session);
2124 } else {
2125 ret = snprintf(sessions[i].path, sizeof(session[i].path), "%s",
2126 session->consumer->dst.trace_path);
2127 }
2128 if (ret < 0) {
2129 PERROR("snprintf session path");
2130 continue;
2131 }
2132
2133 strncpy(sessions[i].name, session->name, NAME_MAX);
2134 sessions[i].name[NAME_MAX - 1] = '\0';
2135 sessions[i].enabled = session->enabled;
2136 i++;
2137 }
2138}
2139
2140/*
2141 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2142 */
2143int cmd_disable_consumer(int domain, struct ltt_session *session)
2144{
2145 int ret;
2146 struct ltt_kernel_session *ksess = session->kernel_session;
2147 struct ltt_ust_session *usess = session->ust_session;
2148 struct consumer_output *consumer;
2149
2150 assert(session);
2151
2152 if (session->enabled) {
2153 /* Can't disable consumer on an already started session */
f73fabfd 2154 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2155 goto error;
2156 }
2157
2158 if (!session->start_consumer) {
f73fabfd 2159 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
2160 goto error;
2161 }
2162
2163 switch (domain) {
2164 case 0:
2165 DBG("Disable tracing session %s consumer", session->name);
2166 consumer = session->consumer;
2167 break;
2168 case LTTNG_DOMAIN_KERNEL:
2169 /* Code flow error if we don't have a kernel session here. */
2170 assert(ksess);
2171
2172 DBG("Disabling kernel consumer");
2173 consumer = ksess->consumer;
2174
2175 break;
2176 case LTTNG_DOMAIN_UST:
2177 /* Code flow error if we don't have a UST session here. */
2178 assert(usess);
2179
2180 DBG("Disabling UST consumer");
2181 consumer = usess->consumer;
2182
2183 break;
2184 default:
f73fabfd 2185 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
2186 goto error;
2187 }
2188
2189 if (consumer) {
2190 consumer->enabled = 0;
2191 /* Success at this point */
f73fabfd 2192 ret = LTTNG_OK;
2f77fc4b 2193 } else {
f73fabfd 2194 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
2195 }
2196
2197error:
2198 return ret;
2199}
2200
2201/*
2202 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2203 */
2204int cmd_enable_consumer(int domain, struct ltt_session *session)
2205{
2206 int ret;
2207 struct ltt_kernel_session *ksess = session->kernel_session;
2208 struct ltt_ust_session *usess = session->ust_session;
2209 struct consumer_output *consumer = NULL;
2210
2211 assert(session);
2212
2213 /* Can't enable consumer after session started. */
2214 if (session->enabled) {
f73fabfd 2215 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2216 goto error;
2217 }
2218
2f77fc4b
DG
2219 switch (domain) {
2220 case 0:
2221 assert(session->consumer);
2222 consumer = session->consumer;
2223 break;
2224 case LTTNG_DOMAIN_KERNEL:
2225 /* Code flow error if we don't have a kernel session here. */
2226 assert(ksess);
2227
2228 /*
2229 * Check if we have already sent fds to the consumer. In that case,
2230 * the enable-consumer command can't be used because a start trace
2231 * had previously occured.
2232 */
2233 if (ksess->consumer_fds_sent) {
f73fabfd 2234 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
2235 goto error;
2236 }
2237
2238 consumer = ksess->tmp_consumer;
2239 if (consumer == NULL) {
f73fabfd 2240 ret = LTTNG_OK;
2f77fc4b
DG
2241 /* No temp. consumer output exists. Using the current one. */
2242 DBG3("No temporary consumer. Using default");
2243 consumer = ksess->consumer;
2244 goto error;
2245 }
2246
2247 switch (consumer->type) {
2248 case CONSUMER_DST_LOCAL:
2249 DBG2("Consumer output is local. Creating directory(ies)");
2250
2251 /* Create directory(ies) */
2252 ret = run_as_mkdir_recursive(consumer->dst.trace_path,
2253 S_IRWXU | S_IRWXG, session->uid, session->gid);
2254 if (ret < 0) {
2255 if (ret != -EEXIST) {
2256 ERR("Trace directory creation error");
f73fabfd 2257 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2258 goto error;
2259 }
2260 }
2261 break;
2262 case CONSUMER_DST_NET:
2263 DBG2("Consumer output is network. Validating URIs");
2264 /* Validate if we have both control and data path set. */
2265 if (!consumer->dst.net.control_isset) {
f73fabfd 2266 ret = LTTNG_ERR_URL_CTRL_MISS;
2f77fc4b
DG
2267 goto error;
2268 }
2269
2270 if (!consumer->dst.net.data_isset) {
f73fabfd 2271 ret = LTTNG_ERR_URL_DATA_MISS;
2f77fc4b
DG
2272 goto error;
2273 }
2274
2275 /* Check established network session state */
2276 if (session->net_handle == 0) {
f73fabfd 2277 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
2278 ERR("Session network handle is not set on enable-consumer");
2279 goto error;
2280 }
2281
2282 break;
2283 }
2284
2f77fc4b
DG
2285 /*
2286 * @session-lock
2287 * This is race free for now since the session lock is acquired before
2288 * ending up in this function. No other threads can access this kernel
2289 * session without this lock hence freeing the consumer output object
2290 * is valid.
2291 */
2292 rcu_read_lock();
9a572cf5 2293 /* Destroy current consumer. We are about to replace it */
2f77fc4b
DG
2294 consumer_destroy_output(ksess->consumer);
2295 rcu_read_unlock();
2296 ksess->consumer = consumer;
2297 ksess->tmp_consumer = NULL;
2298
2299 break;
2300 case LTTNG_DOMAIN_UST:
2301 /* Code flow error if we don't have a UST session here. */
2302 assert(usess);
2303
2304 /*
2305 * Check if we have already sent fds to the consumer. In that case,
2306 * the enable-consumer command can't be used because a start trace
2307 * had previously occured.
2308 */
2309 if (usess->start_trace) {
f73fabfd 2310 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
2311 goto error;
2312 }
2313
2314 consumer = usess->tmp_consumer;
2315 if (consumer == NULL) {
f73fabfd 2316 ret = LTTNG_OK;
2f77fc4b
DG
2317 /* No temp. consumer output exists. Using the current one. */
2318 DBG3("No temporary consumer. Using default");
2319 consumer = usess->consumer;
2320 goto error;
2321 }
2322
2323 switch (consumer->type) {
2324 case CONSUMER_DST_LOCAL:
2325 DBG2("Consumer output is local. Creating directory(ies)");
2326
2327 /* Create directory(ies) */
2328 ret = run_as_mkdir_recursive(consumer->dst.trace_path,
2329 S_IRWXU | S_IRWXG, session->uid, session->gid);
2330 if (ret < 0) {
2331 if (ret != -EEXIST) {
2332 ERR("Trace directory creation error");
f73fabfd 2333 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2334 goto error;
2335 }
2336 }
2337 break;
2338 case CONSUMER_DST_NET:
2339 DBG2("Consumer output is network. Validating URIs");
2340 /* Validate if we have both control and data path set. */
2341 if (!consumer->dst.net.control_isset) {
f73fabfd 2342 ret = LTTNG_ERR_URL_CTRL_MISS;
2f77fc4b
DG
2343 goto error;
2344 }
2345
2346 if (!consumer->dst.net.data_isset) {
f73fabfd 2347 ret = LTTNG_ERR_URL_DATA_MISS;
2f77fc4b
DG
2348 goto error;
2349 }
2350
2351 /* Check established network session state */
2352 if (session->net_handle == 0) {
f73fabfd 2353 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
2354 DBG2("Session network handle is not set on enable-consumer");
2355 goto error;
2356 }
2357
2358 if (consumer->net_seq_index == -1) {
f73fabfd 2359 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
2360 DBG2("Network index is not set on the consumer");
2361 goto error;
2362 }
2363
2364 break;
2365 }
2366
2f77fc4b
DG
2367 /*
2368 * @session-lock
2369 * This is race free for now since the session lock is acquired before
2370 * ending up in this function. No other threads can access this kernel
2371 * session without this lock hence freeing the consumer output object
2372 * is valid.
2373 */
2374 rcu_read_lock();
9a572cf5 2375 /* Destroy current consumer. We are about to replace it */
2f77fc4b
DG
2376 consumer_destroy_output(usess->consumer);
2377 rcu_read_unlock();
2378 usess->consumer = consumer;
2379 usess->tmp_consumer = NULL;
2380
2381 break;
2382 }
2383
4b35a6b3
DG
2384 session->start_consumer = 1;
2385
2f77fc4b
DG
2386 /* Enable it */
2387 if (consumer) {
2388 consumer->enabled = 1;
2389 /* Success at this point */
f73fabfd 2390 ret = LTTNG_OK;
2f77fc4b
DG
2391 } else {
2392 /* Should not really happend... */
f73fabfd 2393 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
2394 }
2395
2396error:
2397 return ret;
2398}
2399
806e2684 2400/*
6d805429
DG
2401 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2402 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
806e2684 2403 */
6d805429 2404int cmd_data_pending(struct ltt_session *session)
806e2684
DG
2405{
2406 int ret;
2407 struct ltt_kernel_session *ksess = session->kernel_session;
2408 struct ltt_ust_session *usess = session->ust_session;
2409
2410 assert(session);
2411
2412 /* Session MUST be stopped to ask for data availability. */
2413 if (session->enabled) {
2414 ret = LTTNG_ERR_SESSION_STARTED;
2415 goto error;
2416 }
2417
2418 if (ksess && ksess->consumer) {
6d805429
DG
2419 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2420 if (ret == 1) {
806e2684
DG
2421 /* Data is still being extracted for the kernel. */
2422 goto error;
2423 }
2424 }
2425
2426 if (usess && usess->consumer) {
6d805429
DG
2427 ret = consumer_is_data_pending(usess->id, usess->consumer);
2428 if (ret == 1) {
806e2684
DG
2429 /* Data is still being extracted for the kernel. */
2430 goto error;
2431 }
2432 }
2433
2434 /* Data is ready to be read by a viewer */
6d805429 2435 ret = 0;
806e2684
DG
2436
2437error:
2438 return ret;
2439}
2440
2f77fc4b
DG
2441/*
2442 * Init command subsystem.
2443 */
2444void cmd_init(void)
2445{
2446 /*
2447 * Set network sequence index to 1 for streams to match a relayd socket on
2448 * the consumer side.
2449 */
2450 uatomic_set(&relayd_net_seq_idx, 1);
2451
2452 DBG("Command subsystem initialized");
2453}
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