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Fix: report already enabled event error to client
[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
6c1c0768 19#define _LGPL_SOURCE
2f77fc4b 20#include <assert.h>
1f345e94 21#include <string.h>
6dc3064a 22#include <inttypes.h>
2f77fc4b
DG		 23#include <urcu/list.h>
24#include <urcu/uatomic.h>
25
26#include <common/defaults.h>
27#include <common/common.h>
28#include <common/sessiond-comm/sessiond-comm.h>
29#include <common/relayd/relayd.h>
10a50311 30#include <common/utils.h>
2f77fc4b
DG		 31
32#include "channel.h"
33#include "consumer.h"
34#include "event.h"
8782cc74 35#include "health-sessiond.h"
2f77fc4b
DG		 36#include "kernel.h"
37#include "kernel-consumer.h"
38#include "lttng-sessiond.h"
39#include "utils.h"
834978fd 40#include "syscall.h"
2f77fc4b
DG		 41
42#include "cmd.h"
43
44/*
45 * Used to keep a unique index for each relayd socket created where this value
46 * is associated with streams on the consumer so it can match the right relayd
d88aee68
DG		 47 * to send to. It must be accessed with the relayd_net_seq_idx_lock
48 * held.
2f77fc4b 49 */
d88aee68
DG		 50static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
51static uint64_t relayd_net_seq_idx;
2f77fc4b 52
1290b5d8
JG		 53static int validate_event_name(const char *);
54static int validate_ust_event_name(const char *);
55static int cmd_enable_event_internal(struct ltt_session *session,
56 struct lttng_domain *domain,
57 char *channel_name, struct lttng_event *event,
58 char *filter_expression,
59 struct lttng_filter_bytecode *filter,
60 struct lttng_event_exclusion *exclusion,
61 int wpipe);
62
2f77fc4b
DG		 63/*
64 * Create a session path used by list_lttng_sessions for the case that the
65 * session consumer is on the network.
66 */
67static int build_network_session_path(char *dst, size_t size,
68 struct ltt_session *session)
69{
70 int ret, kdata_port, udata_port;
71 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
72 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
73
74 assert(session);
75 assert(dst);
76
77 memset(tmp_urls, 0, sizeof(tmp_urls));
78 memset(tmp_uurl, 0, sizeof(tmp_uurl));
79
80 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
81
82 if (session->kernel_session && session->kernel_session->consumer) {
83 kuri = &session->kernel_session->consumer->dst.net.control;
84 kdata_port = session->kernel_session->consumer->dst.net.data.port;
85 }
86
87 if (session->ust_session && session->ust_session->consumer) {
88 uuri = &session->ust_session->consumer->dst.net.control;
89 udata_port = session->ust_session->consumer->dst.net.data.port;
90 }
91
92 if (uuri == NULL && kuri == NULL) {
93 uri = &session->consumer->dst.net.control;
94 kdata_port = session->consumer->dst.net.data.port;
95 } else if (kuri && uuri) {
96 ret = uri_compare(kuri, uuri);
97 if (ret) {
98 /* Not Equal */
99 uri = kuri;
100 /* Build uuri URL string */
101 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
102 if (ret < 0) {
103 goto error;
104 }
105 } else {
106 uri = kuri;
107 }
108 } else if (kuri && uuri == NULL) {
109 uri = kuri;
110 } else if (uuri && kuri == NULL) {
111 uri = uuri;
112 }
113
114 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
115 if (ret < 0) {
116 goto error;
117 }
118
9aa9f900
DG		 119 /*
120 * Do we have a UST url set. If yes, this means we have both kernel and UST
121 * to print.
122 */
9d035200 123 if (*tmp_uurl != '\0') {
2f77fc4b
DG		 124 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
125 tmp_urls, kdata_port, tmp_uurl, udata_port);
126 } else {
9aa9f900 127 int dport;
bef08707 128 if (kuri || (!kuri && !uuri)) {
9aa9f900
DG		 129 dport = kdata_port;
130 } else {
131 /* No kernel URI, use the UST port. */
132 dport = udata_port;
133 }
134 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
2f77fc4b
DG		 135 }
136
137error:
138 return ret;
139}
140
141/*
142 * Fill lttng_channel array of all channels.
143 */
144static void list_lttng_channels(int domain, struct ltt_session *session,
145 struct lttng_channel *channels)
146{
147 int i = 0;
148 struct ltt_kernel_channel *kchan;
149
150 DBG("Listing channels for session %s", session->name);
151
152 switch (domain) {
153 case LTTNG_DOMAIN_KERNEL:
154 /* Kernel channels */
155 if (session->kernel_session != NULL) {
156 cds_list_for_each_entry(kchan,
157 &session->kernel_session->channel_list.head, list) {
158 /* Copy lttng_channel struct to array */
159 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
160 channels[i].enabled = kchan->enabled;
161 i++;
162 }
163 }
164 break;
165 case LTTNG_DOMAIN_UST:
166 {
167 struct lttng_ht_iter iter;
168 struct ltt_ust_channel *uchan;
169
e7fe706f 170 rcu_read_lock();
2f77fc4b
DG		 171 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
172 &iter.iter, uchan, node.node) {
173 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
174 channels[i].attr.overwrite = uchan->attr.overwrite;
175 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
176 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
177 channels[i].attr.switch_timer_interval =
178 uchan->attr.switch_timer_interval;
179 channels[i].attr.read_timer_interval =
180 uchan->attr.read_timer_interval;
181 channels[i].enabled = uchan->enabled;
2f785fe7
DG		 182 channels[i].attr.tracefile_size = uchan->tracefile_size;
183 channels[i].attr.tracefile_count = uchan->tracefile_count;
2f77fc4b
DG		 184 switch (uchan->attr.output) {
185 case LTTNG_UST_MMAP:
186 default:
187 channels[i].attr.output = LTTNG_EVENT_MMAP;
188 break;
189 }
190 i++;
191 }
e7fe706f 192 rcu_read_unlock();
2f77fc4b
DG		 193 break;
194 }
195 default:
196 break;
197 }
198}
199
3c6a091f 200/*
022d91ba 201 * Create a list of agent domain events.
3c6a091f
DG		 202 *
203 * Return number of events in list on success or else a negative value.
204 */
022d91ba 205static int list_lttng_agent_events(struct agent *agt,
3c6a091f
DG		 206 struct lttng_event **events)
207{
208 int i = 0, ret = 0;
209 unsigned int nb_event = 0;
022d91ba 210 struct agent_event *event;
3c6a091f
DG		 211 struct lttng_event *tmp_events;
212 struct lttng_ht_iter iter;
213
022d91ba 214 assert(agt);
3c6a091f
DG		 215 assert(events);
216
022d91ba 217 DBG3("Listing agent events");
3c6a091f 218
e5bbf678 219 rcu_read_lock();
022d91ba 220 nb_event = lttng_ht_get_count(agt->events);
e5bbf678 221 rcu_read_unlock();
3c6a091f
DG		 222 if (nb_event == 0) {
223 ret = nb_event;
224 goto error;
225 }
226
227 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
228 if (!tmp_events) {
022d91ba 229 PERROR("zmalloc agent events session");
3c6a091f
DG		 230 ret = -LTTNG_ERR_FATAL;
231 goto error;
232 }
233
234 rcu_read_lock();
022d91ba 235 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
3c6a091f
DG		 236 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
237 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
238 tmp_events[i].enabled = event->enabled;
79a065a0 239 tmp_events[i].loglevel = event->loglevel_value;
ff94328f 240 tmp_events[i].loglevel_type = event->loglevel_type;
3c6a091f
DG		 241 i++;
242 }
243 rcu_read_unlock();
244
245 *events = tmp_events;
246 ret = nb_event;
247
248error:
249 assert(nb_event == i);
250 return ret;
251}
252
2f77fc4b
DG		 253/*
254 * Create a list of ust global domain events.
255 */
256static int list_lttng_ust_global_events(char *channel_name,
257 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
258{
259 int i = 0, ret = 0;
260 unsigned int nb_event = 0;
261 struct lttng_ht_iter iter;
262 struct lttng_ht_node_str *node;
263 struct ltt_ust_channel *uchan;
264 struct ltt_ust_event *uevent;
265 struct lttng_event *tmp;
266
267 DBG("Listing UST global events for channel %s", channel_name);
268
269 rcu_read_lock();
270
271 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
272 node = lttng_ht_iter_get_node_str(&iter);
273 if (node == NULL) {
f73fabfd 274 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG		 275 goto error;
276 }
277
278 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
279
8040687e 280 nb_event = lttng_ht_get_count(uchan->events);
2f77fc4b
DG		 281 if (nb_event == 0) {
282 ret = nb_event;
283 goto error;
284 }
285
286 DBG3("Listing UST global %d events", nb_event);
287
288 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
289 if (tmp == NULL) {
f73fabfd 290 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 291 goto error;
292 }
293
294 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
8040687e
JG		 295 if (uevent->internal) {
296 /* This event should remain hidden from clients */
297 nb_event--;
298 continue;
299 }
2f77fc4b
DG		 300 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
301 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
302 tmp[i].enabled = uevent->enabled;
303
304 switch (uevent->attr.instrumentation) {
305 case LTTNG_UST_TRACEPOINT:
306 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
307 break;
308 case LTTNG_UST_PROBE:
309 tmp[i].type = LTTNG_EVENT_PROBE;
310 break;
311 case LTTNG_UST_FUNCTION:
312 tmp[i].type = LTTNG_EVENT_FUNCTION;
313 break;
314 }
315
316 tmp[i].loglevel = uevent->attr.loglevel;
317 switch (uevent->attr.loglevel_type) {
318 case LTTNG_UST_LOGLEVEL_ALL:
319 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
320 break;
321 case LTTNG_UST_LOGLEVEL_RANGE:
322 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
323 break;
324 case LTTNG_UST_LOGLEVEL_SINGLE:
325 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
326 break;
327 }
328 if (uevent->filter) {
329 tmp[i].filter = 1;
330 }
4634f12e
JI		 331 if (uevent->exclusion) {
332 tmp[i].exclusion = 1;
333 }
2f77fc4b
DG		 334 i++;
335 }
336
337 ret = nb_event;
338 *events = tmp;
339
340error:
341 rcu_read_unlock();
342 return ret;
343}
344
345/*
346 * Fill lttng_event array of all kernel events in the channel.
347 */
348static int list_lttng_kernel_events(char *channel_name,
349 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
350{
351 int i = 0, ret;
352 unsigned int nb_event;
353 struct ltt_kernel_event *event;
354 struct ltt_kernel_channel *kchan;
355
356 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
357 if (kchan == NULL) {
f73fabfd 358 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG		 359 goto error;
360 }
361
362 nb_event = kchan->event_count;
363
364 DBG("Listing events for channel %s", kchan->channel->name);
365
366 if (nb_event == 0) {
834978fd
DG		 367 *events = NULL;
368 goto syscall;
2f77fc4b
DG		 369 }
370
371 *events = zmalloc(nb_event * sizeof(struct lttng_event));
372 if (*events == NULL) {
f73fabfd 373 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 374 goto error;
375 }
376
377 /* Kernel channels */
378 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
379 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
380 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
381 (*events)[i].enabled = event->enabled;
1d515f95
JG		 382 (*events)[i].filter =
383 (unsigned char) !!event->filter_expression;
2f77fc4b
DG		 384
385 switch (event->event->instrumentation) {
386 case LTTNG_KERNEL_TRACEPOINT:
387 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
388 break;
2f77fc4b 389 case LTTNG_KERNEL_KRETPROBE:
1896972b
DG		 390 (*events)[i].type = LTTNG_EVENT_FUNCTION;
391 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
392 sizeof(struct lttng_kernel_kprobe));
393 break;
394 case LTTNG_KERNEL_KPROBE:
2f77fc4b
DG		 395 (*events)[i].type = LTTNG_EVENT_PROBE;
396 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
397 sizeof(struct lttng_kernel_kprobe));
398 break;
399 case LTTNG_KERNEL_FUNCTION:
400 (*events)[i].type = LTTNG_EVENT_FUNCTION;
401 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
402 sizeof(struct lttng_kernel_function));
403 break;
404 case LTTNG_KERNEL_NOOP:
405 (*events)[i].type = LTTNG_EVENT_NOOP;
406 break;
407 case LTTNG_KERNEL_SYSCALL:
408 (*events)[i].type = LTTNG_EVENT_SYSCALL;
409 break;
410 case LTTNG_KERNEL_ALL:
411 assert(0);
412 break;
413 }
414 i++;
415 }
416
834978fd
DG		 417syscall:
418 if (syscall_table) {
419 ssize_t new_size;
420
421 new_size = syscall_list_channel(kchan, events, nb_event);
422 if (new_size < 0) {
423 free(events);
424 ret = -new_size;
425 goto error;
426 }
427 nb_event = new_size;
428 }
429
2f77fc4b
DG		 430 return nb_event;
431
432error:
f73fabfd
DG		 433 /* Negate the error code to differentiate the size from an error */
434 return -ret;
2f77fc4b
DG		 435}
436
437/*
438 * Add URI so the consumer output object. Set the correct path depending on the
439 * domain adding the default trace directory.
440 */
441static int add_uri_to_consumer(struct consumer_output *consumer,
442 struct lttng_uri *uri, int domain, const char *session_name)
443{
f73fabfd 444 int ret = LTTNG_OK;
2f77fc4b
DG		 445 const char *default_trace_dir;
446
447 assert(uri);
448
449 if (consumer == NULL) {
450 DBG("No consumer detected. Don't add URI. Stopping.");
f73fabfd 451 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG		 452 goto error;
453 }
454
455 switch (domain) {
456 case LTTNG_DOMAIN_KERNEL:
457 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
458 break;
459 case LTTNG_DOMAIN_UST:
460 default_trace_dir = DEFAULT_UST_TRACE_DIR;
461 break;
462 default:
463 /*
464 * This case is possible is we try to add the URI to the global tracing
465 * session consumer object which in this case there is no subdir.
466 */
467 default_trace_dir = "";
468 }
469
470 switch (uri->dtype) {
471 case LTTNG_DST_IPV4:
472 case LTTNG_DST_IPV6:
473 DBG2("Setting network URI to consumer");
474
df75acac
DG		 475 if (consumer->type == CONSUMER_DST_NET) {
476 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG		 477 consumer->dst.net.control_isset) ||
478 (uri->stype == LTTNG_STREAM_DATA &&
479 consumer->dst.net.data_isset)) {
df75acac
DG		 480 ret = LTTNG_ERR_URL_EXIST;
481 goto error;
482 }
483 } else {
484 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
785d2d0d
DG		 485 }
486
df75acac
DG		 487 consumer->type = CONSUMER_DST_NET;
488
2f77fc4b
DG		 489 /* Set URI into consumer output object */
490 ret = consumer_set_network_uri(consumer, uri);
491 if (ret < 0) {
a74934ba 492 ret = -ret;
2f77fc4b
DG		 493 goto error;
494 } else if (ret == 1) {
495 /*
496 * URI was the same in the consumer so we do not append the subdir
497 * again so to not duplicate output dir.
498 */
f86c9f4e 499 ret = LTTNG_OK;
2f77fc4b
DG		 500 goto error;
501 }
502
503 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
504 ret = consumer_set_subdir(consumer, session_name);
505 if (ret < 0) {
f73fabfd 506 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 507 goto error;
508 }
509 }
510
511 if (uri->stype == LTTNG_STREAM_CONTROL) {
512 /* On a new subdir, reappend the default trace dir. */
c30ce0b3
CB		 513 strncat(consumer->subdir, default_trace_dir,
514 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG		 515 DBG3("Append domain trace name to subdir %s", consumer->subdir);
516 }
517
518 break;
519 case LTTNG_DST_PATH:
520 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
521 memset(consumer->dst.trace_path, 0,
522 sizeof(consumer->dst.trace_path));
523 strncpy(consumer->dst.trace_path, uri->dst.path,
524 sizeof(consumer->dst.trace_path));
525 /* Append default trace dir */
526 strncat(consumer->dst.trace_path, default_trace_dir,
c30ce0b3
CB		 527 sizeof(consumer->dst.trace_path) -
528 strlen(consumer->dst.trace_path) - 1);
2f77fc4b
DG		 529 /* Flag consumer as local. */
530 consumer->type = CONSUMER_DST_LOCAL;
531 break;
532 }
533
a74934ba
DG		 534 ret = LTTNG_OK;
535
2f77fc4b
DG		 536error:
537 return ret;
538}
539
540/*
541 * Init tracing by creating trace directory and sending fds kernel consumer.
542 */
543static int init_kernel_tracing(struct ltt_kernel_session *session)
544{
545 int ret = 0;
546 struct lttng_ht_iter iter;
547 struct consumer_socket *socket;
548
549 assert(session);
550
e7fe706f
DG		 551 rcu_read_lock();
552
2f77fc4b
DG		 553 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
554 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
555 socket, node.node) {
2f77fc4b 556 pthread_mutex_lock(socket->lock);
f50f23d9 557 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG		 558 pthread_mutex_unlock(socket->lock);
559 if (ret < 0) {
f73fabfd 560 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG		 561 goto error;
562 }
563 }
564 }
565
566error:
e7fe706f 567 rcu_read_unlock();
2f77fc4b
DG		 568 return ret;
569}
570
571/*
572 * Create a socket to the relayd using the URI.
573 *
574 * On success, the relayd_sock pointer is set to the created socket.
575 * Else, it's stays untouched and a lttcomm error code is returned.
576 */
6151a90f
JD		 577static int create_connect_relayd(struct lttng_uri *uri,
578 struct lttcomm_relayd_sock **relayd_sock)
2f77fc4b
DG		 579{
580 int ret;
6151a90f 581 struct lttcomm_relayd_sock *rsock;
2f77fc4b 582
6151a90f
JD		 583 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
584 RELAYD_VERSION_COMM_MINOR);
585 if (!rsock) {
f73fabfd 586 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 587 goto error;
588 }
589
ffe60014
DG		 590 /*
591 * Connect to relayd so we can proceed with a session creation. This call
592 * can possibly block for an arbitrary amount of time to set the health
593 * state to be in poll execution.
594 */
595 health_poll_entry();
6151a90f 596 ret = relayd_connect(rsock);
ffe60014 597 health_poll_exit();
2f77fc4b
DG		 598 if (ret < 0) {
599 ERR("Unable to reach lttng-relayd");
f73fabfd 600 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG		 601 goto free_sock;
602 }
603
604 /* Create socket for control stream. */
605 if (uri->stype == LTTNG_STREAM_CONTROL) {
606 DBG3("Creating relayd stream socket from URI");
607
608 /* Check relayd version */
6151a90f 609 ret = relayd_version_check(rsock);
2f77fc4b 610 if (ret < 0) {
f73fabfd 611 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
2f77fc4b
DG		 612 goto close_sock;
613 }
614 } else if (uri->stype == LTTNG_STREAM_DATA) {
615 DBG3("Creating relayd data socket from URI");
616 } else {
617 /* Command is not valid */
618 ERR("Relayd invalid stream type: %d", uri->stype);
f73fabfd 619 ret = LTTNG_ERR_INVALID;
2f77fc4b
DG		 620 goto close_sock;
621 }
622
6151a90f 623 *relayd_sock = rsock;
2f77fc4b 624
f73fabfd 625 return LTTNG_OK;
2f77fc4b
DG		 626
627close_sock:
6151a90f
JD		 628 /* The returned value is not useful since we are on an error path. */
629 (void) relayd_close(rsock);
2f77fc4b 630free_sock:
6151a90f 631 free(rsock);
2f77fc4b
DG		 632error:
633 return ret;
634}
635
636/*
637 * Connect to the relayd using URI and send the socket to the right consumer.
638 */
6dc3064a 639static int send_consumer_relayd_socket(int domain, unsigned int session_id,
2f77fc4b 640 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
d3e2ba59
JD		 641 struct consumer_socket *consumer_sock,
642 char *session_name, char *hostname, int session_live_timer)
2f77fc4b
DG		 643{
644 int ret;
6151a90f 645 struct lttcomm_relayd_sock *rsock = NULL;
2f77fc4b 646
ffe60014 647 /* Connect to relayd and make version check if uri is the control. */
6151a90f 648 ret = create_connect_relayd(relayd_uri, &rsock);
ffe60014 649 if (ret != LTTNG_OK) {
6151a90f 650 goto error;
ffe60014 651 }
6151a90f 652 assert(rsock);
ffe60014 653
2f77fc4b 654 /* Set the network sequence index if not set. */
d88aee68
DG		 655 if (consumer->net_seq_index == (uint64_t) -1ULL) {
656 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG		 657 /*
658 * Increment net_seq_idx because we are about to transfer the
659 * new relayd socket to the consumer.
d88aee68 660 * Assign unique key so the consumer can match streams.
2f77fc4b 661 */
d88aee68
DG		 662 consumer->net_seq_index = ++relayd_net_seq_idx;
663 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG		 664 }
665
2f77fc4b 666 /* Send relayd socket to consumer. */
6151a90f 667 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
d3e2ba59
JD		 668 relayd_uri->stype, session_id,
669 session_name, hostname, session_live_timer);
2f77fc4b 670 if (ret < 0) {
f73fabfd 671 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG		 672 goto close_sock;
673 }
674
c890b720
DG		 675 /* Flag that the corresponding socket was sent. */
676 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 677 consumer_sock->control_sock_sent = 1;
c890b720 678 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 679 consumer_sock->data_sock_sent = 1;
c890b720
DG		 680 }
681
f73fabfd 682 ret = LTTNG_OK;
2f77fc4b
DG		 683
684 /*
685 * Close socket which was dup on the consumer side. The session daemon does
686 * NOT keep track of the relayd socket(s) once transfer to the consumer.
687 */
688
689close_sock:
6151a90f
JD		 690 (void) relayd_close(rsock);
691 free(rsock);
2f77fc4b 692
6151a90f 693error:
ffe60014
DG		 694 if (ret != LTTNG_OK) {
695 /*
d9078d0c
DG		 696 * The consumer output for this session should not be used anymore
697 * since the relayd connection failed thus making any tracing or/and
698 * streaming not usable.
ffe60014 699 */
d9078d0c 700 consumer->enabled = 0;
ffe60014 701 }
2f77fc4b
DG		 702 return ret;
703}
704
705/*
706 * Send both relayd sockets to a specific consumer and domain. This is a
707 * helper function to facilitate sending the information to the consumer for a
708 * session.
709 */
6dc3064a 710static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
d3e2ba59
JD		 711 struct consumer_output *consumer, struct consumer_socket *sock,
712 char *session_name, char *hostname, int session_live_timer)
2f77fc4b 713{
dda67f6c 714 int ret = LTTNG_OK;
2f77fc4b 715
2f77fc4b 716 assert(consumer);
6dc3064a 717 assert(sock);
2f77fc4b 718
2f77fc4b 719 /* Sending control relayd socket. */
ffe60014 720 if (!sock->control_sock_sent) {
6dc3064a 721 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD		 722 &consumer->dst.net.control, consumer, sock,
723 session_name, hostname, session_live_timer);
c890b720
DG		 724 if (ret != LTTNG_OK) {
725 goto error;
726 }
2f77fc4b
DG		 727 }
728
729 /* Sending data relayd socket. */
ffe60014 730 if (!sock->data_sock_sent) {
6dc3064a 731 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD		 732 &consumer->dst.net.data, consumer, sock,
733 session_name, hostname, session_live_timer);
c890b720
DG		 734 if (ret != LTTNG_OK) {
735 goto error;
736 }
2f77fc4b
DG		 737 }
738
2f77fc4b
DG		 739error:
740 return ret;
741}
742
743/*
744 * Setup relayd connections for a tracing session. First creates the socket to
745 * the relayd and send them to the right domain consumer. Consumer type MUST be
746 * network.
747 */
ffe60014 748int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 749{
f73fabfd 750 int ret = LTTNG_OK;
2f77fc4b
DG		 751 struct ltt_ust_session *usess;
752 struct ltt_kernel_session *ksess;
753 struct consumer_socket *socket;
754 struct lttng_ht_iter iter;
755
756 assert(session);
757
758 usess = session->ust_session;
759 ksess = session->kernel_session;
760
785d2d0d 761 DBG("Setting relayd for session %s", session->name);
2f77fc4b 762
e7fe706f
DG		 763 rcu_read_lock();
764
2f77fc4b
DG		 765 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
766 && usess->consumer->enabled) {
767 /* For each consumer socket, send relayd sockets */
768 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
769 socket, node.node) {
2f77fc4b 770 pthread_mutex_lock(socket->lock);
6dc3064a 771 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
d3e2ba59
JD		 772 usess->consumer, socket,
773 session->name, session->hostname,
774 session->live_timer);
2f77fc4b 775 pthread_mutex_unlock(socket->lock);
f73fabfd 776 if (ret != LTTNG_OK) {
2f77fc4b
DG		 777 goto error;
778 }
6dc3064a
DG		 779 /* Session is now ready for network streaming. */
780 session->net_handle = 1;
2f77fc4b
DG		 781 }
782 }
783
784 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
785 && ksess->consumer->enabled) {
786 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
787 socket, node.node) {
2f77fc4b 788 pthread_mutex_lock(socket->lock);
6dc3064a 789 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
d3e2ba59
JD		 790 ksess->consumer, socket,
791 session->name, session->hostname,
792 session->live_timer);
2f77fc4b 793 pthread_mutex_unlock(socket->lock);
f73fabfd 794 if (ret != LTTNG_OK) {
2f77fc4b
DG		 795 goto error;
796 }
6dc3064a
DG		 797 /* Session is now ready for network streaming. */
798 session->net_handle = 1;
2f77fc4b
DG		 799 }
800 }
801
802error:
e7fe706f 803 rcu_read_unlock();
2f77fc4b
DG		 804 return ret;
805}
806
9b6c7ec5
DG		 807/*
808 * Start a kernel session by opening all necessary streams.
809 */
810static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
811{
812 int ret;
813 struct ltt_kernel_channel *kchan;
814
815 /* Open kernel metadata */
07b86b52 816 if (ksess->metadata == NULL && ksess->output_traces) {
9b6c7ec5
DG		 817 ret = kernel_open_metadata(ksess);
818 if (ret < 0) {
819 ret = LTTNG_ERR_KERN_META_FAIL;
820 goto error;
821 }
822 }
823
824 /* Open kernel metadata stream */
07b86b52 825 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
9b6c7ec5
DG		 826 ret = kernel_open_metadata_stream(ksess);
827 if (ret < 0) {
828 ERR("Kernel create metadata stream failed");
829 ret = LTTNG_ERR_KERN_STREAM_FAIL;
830 goto error;
831 }
832 }
833
834 /* For each channel */
835 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
836 if (kchan->stream_count == 0) {
837 ret = kernel_open_channel_stream(kchan);
838 if (ret < 0) {
839 ret = LTTNG_ERR_KERN_STREAM_FAIL;
840 goto error;
841 }
842 /* Update the stream global counter */
843 ksess->stream_count_global += ret;
844 }
845 }
846
847 /* Setup kernel consumer socket and send fds to it */
848 ret = init_kernel_tracing(ksess);
e43c41c5 849 if (ret != 0) {
9b6c7ec5
DG		 850 ret = LTTNG_ERR_KERN_START_FAIL;
851 goto error;
852 }
853
854 /* This start the kernel tracing */
855 ret = kernel_start_session(ksess);
856 if (ret < 0) {
857 ret = LTTNG_ERR_KERN_START_FAIL;
858 goto error;
859 }
860
861 /* Quiescent wait after starting trace */
784303b0 862 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5 863
14fb1ebe 864 ksess->active = 1;
9b6c7ec5
DG		 865
866 ret = LTTNG_OK;
867
868error:
869 return ret;
870}
871
2f77fc4b
DG		 872/*
873 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
874 */
875int cmd_disable_channel(struct ltt_session *session, int domain,
876 char *channel_name)
877{
878 int ret;
879 struct ltt_ust_session *usess;
880
881 usess = session->ust_session;
882
2223c96f
DG		 883 rcu_read_lock();
884
2f77fc4b
DG		 885 switch (domain) {
886 case LTTNG_DOMAIN_KERNEL:
887 {
888 ret = channel_kernel_disable(session->kernel_session,
889 channel_name);
f73fabfd 890 if (ret != LTTNG_OK) {
2f77fc4b
DG		 891 goto error;
892 }
893
894 kernel_wait_quiescent(kernel_tracer_fd);
895 break;
896 }
897 case LTTNG_DOMAIN_UST:
898 {
899 struct ltt_ust_channel *uchan;
900 struct lttng_ht *chan_ht;
901
902 chan_ht = usess->domain_global.channels;
903
904 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
905 if (uchan == NULL) {
f73fabfd 906 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG		 907 goto error;
908 }
909
7972aab2 910 ret = channel_ust_disable(usess, uchan);
f73fabfd 911 if (ret != LTTNG_OK) {
2f77fc4b
DG		 912 goto error;
913 }
914 break;
915 }
2f77fc4b 916 default:
f73fabfd 917 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG		 918 goto error;
919 }
920
f73fabfd 921 ret = LTTNG_OK;
2f77fc4b
DG		 922
923error:
2223c96f 924 rcu_read_unlock();
2f77fc4b
DG		 925 return ret;
926}
927
ccf10263
MD		 928/*
929 * Command LTTNG_TRACK_PID processed by the client thread.
a9ad0c8f
MD		 930 *
931 * Called with session lock held.
ccf10263
MD		 932 */
933int cmd_track_pid(struct ltt_session *session, int domain, int pid)
934{
935 int ret;
936
937 rcu_read_lock();
938
939 switch (domain) {
940 case LTTNG_DOMAIN_KERNEL:
941 {
942 struct ltt_kernel_session *ksess;
943
944 ksess = session->kernel_session;
945
946 ret = kernel_track_pid(ksess, pid);
947 if (ret != LTTNG_OK) {
948 goto error;
949 }
950
951 kernel_wait_quiescent(kernel_tracer_fd);
952 break;
953 }
ccf10263 954 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD		 955 {
956 struct ltt_ust_session *usess;
957
958 usess = session->ust_session;
959
960 ret = trace_ust_track_pid(usess, pid);
961 if (ret != LTTNG_OK) {
962 goto error;
963 }
964 break;
965 }
ccf10263
MD		 966 default:
967 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
968 goto error;
969 }
970
971 ret = LTTNG_OK;
972
973error:
974 rcu_read_unlock();
975 return ret;
976}
977
978/*
979 * Command LTTNG_UNTRACK_PID processed by the client thread.
a9ad0c8f
MD		 980 *
981 * Called with session lock held.
ccf10263
MD		 982 */
983int cmd_untrack_pid(struct ltt_session *session, int domain, int pid)
984{
985 int ret;
986
987 rcu_read_lock();
988
989 switch (domain) {
990 case LTTNG_DOMAIN_KERNEL:
991 {
992 struct ltt_kernel_session *ksess;
993
994 ksess = session->kernel_session;
995
996 ret = kernel_untrack_pid(ksess, pid);
997 if (ret != LTTNG_OK) {
998 goto error;
999 }
1000
1001 kernel_wait_quiescent(kernel_tracer_fd);
1002 break;
1003 }
ccf10263 1004 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD		 1005 {
1006 struct ltt_ust_session *usess;
1007
1008 usess = session->ust_session;
1009
1010 ret = trace_ust_untrack_pid(usess, pid);
1011 if (ret != LTTNG_OK) {
1012 goto error;
1013 }
1014 break;
1015 }
ccf10263
MD		 1016 default:
1017 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1018 goto error;
1019 }
1020
1021 ret = LTTNG_OK;
1022
1023error:
1024 rcu_read_unlock();
1025 return ret;
1026}
1027
2f77fc4b
DG		 1028/*
1029 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1030 *
1031 * The wpipe arguments is used as a notifier for the kernel thread.
1032 */
1033int cmd_enable_channel(struct ltt_session *session,
7972aab2 1034 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
2f77fc4b
DG		 1035{
1036 int ret;
1037 struct ltt_ust_session *usess = session->ust_session;
1038 struct lttng_ht *chan_ht;
1f345e94 1039 size_t len;
2f77fc4b
DG		 1040
1041 assert(session);
1042 assert(attr);
7972aab2 1043 assert(domain);
2f77fc4b 1044
1f345e94
PP		 1045 len = strnlen(attr->name, sizeof(attr->name));
1046
1047 /* Validate channel name */
1048 if (attr->name[0] == '.' ||
1049 memchr(attr->name, '/', len) != NULL) {
1050 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1051 goto end;
1052 }
1053
2f77fc4b
DG		 1054 DBG("Enabling channel %s for session %s", attr->name, session->name);
1055
03b4fdcf
DG		 1056 rcu_read_lock();
1057
ecc48a90
JD		 1058 /*
1059 * Don't try to enable a channel if the session has been started at
1060 * some point in time before. The tracer does not allow it.
1061 */
8382cf6f 1062 if (session->has_been_started) {
ecc48a90
JD		 1063 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1064 goto error;
1065 }
1066
1067 /*
1068 * If the session is a live session, remove the switch timer, the
1069 * live timer does the same thing but sends also synchronisation
1070 * beacons for inactive streams.
1071 */
1072 if (session->live_timer > 0) {
1073 attr->attr.live_timer_interval = session->live_timer;
1074 attr->attr.switch_timer_interval = 0;
1075 }
1076
33fbd469
DG		 1077 /*
1078 * The ringbuffer (both in user space and kernel) behave badly in overwrite
1079 * mode and with less than 2 subbuf so block it right away and send back an
1080 * invalid attribute error.
1081 */
1082 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
1083 ret = LTTNG_ERR_INVALID;
1084 goto error;
1085 }
1086
7972aab2 1087 switch (domain->type) {
2f77fc4b
DG		 1088 case LTTNG_DOMAIN_KERNEL:
1089 {
1090 struct ltt_kernel_channel *kchan;
1091
2f77fc4b
DG		 1092 kchan = trace_kernel_get_channel_by_name(attr->name,
1093 session->kernel_session);
1094 if (kchan == NULL) {
1095 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
85076754
MD		 1096 if (attr->name[0] != '\0') {
1097 session->kernel_session->has_non_default_channel = 1;
1098 }
2f77fc4b
DG		 1099 } else {
1100 ret = channel_kernel_enable(session->kernel_session, kchan);
1101 }
1102
f73fabfd 1103 if (ret != LTTNG_OK) {
2f77fc4b
DG		 1104 goto error;
1105 }
1106
784303b0 1107 kernel_wait_quiescent(kernel_tracer_fd);
2f77fc4b
DG		 1108 break;
1109 }
1110 case LTTNG_DOMAIN_UST:
ab24e525
JG		 1111 case LTTNG_DOMAIN_JUL:
1112 case LTTNG_DOMAIN_LOG4J:
1113 case LTTNG_DOMAIN_PYTHON:
2f77fc4b
DG		 1114 {
1115 struct ltt_ust_channel *uchan;
1116
ab24e525
JG		 1117 /*
1118 * FIXME
1119 *
1120 * Current agent implementation limitations force us to allow
1121 * only one channel at once in "agent" subdomains. Each
1122 * subdomain has a default channel name which must be strictly
1123 * adhered to.
1124 */
1125 if (domain->type == LTTNG_DOMAIN_JUL) {
1126 if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME,
1127 LTTNG_SYMBOL_NAME_LEN)) {
1128 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1129 goto error;
1130 }
1131 } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
1132 if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME,
1133 LTTNG_SYMBOL_NAME_LEN)) {
1134 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1135 goto error;
1136 }
1137 } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
1138 if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME,
1139 LTTNG_SYMBOL_NAME_LEN)) {
1140 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1141 goto error;
1142 }
1143 }
1144
2f77fc4b
DG		 1145 chan_ht = usess->domain_global.channels;
1146
1147 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1148 if (uchan == NULL) {
7972aab2 1149 ret = channel_ust_create(usess, attr, domain->buf_type);
85076754
MD		 1150 if (attr->name[0] != '\0') {
1151 usess->has_non_default_channel = 1;
1152 }
2f77fc4b 1153 } else {
7972aab2 1154 ret = channel_ust_enable(usess, uchan);
2f77fc4b
DG		 1155 }
1156 break;
1157 }
2f77fc4b 1158 default:
f73fabfd 1159 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG		 1160 goto error;
1161 }
1162
1163error:
2223c96f 1164 rcu_read_unlock();
1f345e94 1165end:
2f77fc4b
DG		 1166 return ret;
1167}
1168
2f77fc4b
DG		 1169/*
1170 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1171 */
1172int cmd_disable_event(struct ltt_session *session, int domain,
6e911cad
MD		 1173 char *channel_name,
1174 struct lttng_event *event)
2f77fc4b
DG		 1175{
1176 int ret;
6e911cad
MD		 1177 char *event_name;
1178
18a720cd
MD		 1179 DBG("Disable event command for event \'%s\'", event->name);
1180
6e911cad 1181 event_name = event->name;
1290b5d8
JG		 1182 if (validate_event_name(event_name)) {
1183 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1184 goto error;
1185 }
6e911cad 1186
9b7431cf
JG		 1187 /* Error out on unhandled search criteria */
1188 if (event->loglevel_type || event->loglevel != -1 || event->enabled
6e911cad 1189 || event->pid || event->filter || event->exclusion) {
1290b5d8
JG		 1190 ret = LTTNG_ERR_UNK;
1191 goto error;
6e911cad 1192 }
2f77fc4b 1193
2223c96f
DG		 1194 rcu_read_lock();
1195
2f77fc4b
DG		 1196 switch (domain) {
1197 case LTTNG_DOMAIN_KERNEL:
1198 {
1199 struct ltt_kernel_channel *kchan;
1200 struct ltt_kernel_session *ksess;
1201
1202 ksess = session->kernel_session;
1203
85076754
MD		 1204 /*
1205 * If a non-default channel has been created in the
1206 * session, explicitely require that -c chan_name needs
1207 * to be provided.
1208 */
1209 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1210 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1290b5d8 1211 goto error_unlock;
85076754
MD		 1212 }
1213
2f77fc4b
DG		 1214 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1215 if (kchan == NULL) {
f73fabfd 1216 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1290b5d8 1217 goto error_unlock;
2f77fc4b
DG		 1218 }
1219
6e911cad
MD		 1220 switch (event->type) {
1221 case LTTNG_EVENT_ALL:
6ed2fd39 1222 case LTTNG_EVENT_TRACEPOINT:
d0ae4ea8 1223 case LTTNG_EVENT_SYSCALL:
6ed2fd39
JR		 1224 case LTTNG_EVENT_PROBE:
1225 case LTTNG_EVENT_FUNCTION:
1226 case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */
1227 if (event_name[0] == '\0') {
1228 ret = event_kernel_disable_event(kchan,
1229 NULL, event->type);
29c62722 1230 } else {
d0ae4ea8 1231 ret = event_kernel_disable_event(kchan,
6ed2fd39 1232 event_name, event->type);
29c62722 1233 }
6e911cad 1234 if (ret != LTTNG_OK) {
1290b5d8 1235 goto error_unlock;
6e911cad
MD		 1236 }
1237 break;
6e911cad
MD		 1238 default:
1239 ret = LTTNG_ERR_UNK;
1290b5d8 1240 goto error_unlock;
2f77fc4b
DG		 1241 }
1242
1243 kernel_wait_quiescent(kernel_tracer_fd);
1244 break;
1245 }
1246 case LTTNG_DOMAIN_UST:
1247 {
1248 struct ltt_ust_channel *uchan;
1249 struct ltt_ust_session *usess;
1250
1251 usess = session->ust_session;
1252
1290b5d8
JG		 1253 if (validate_ust_event_name(event_name)) {
1254 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1255 goto error_unlock;
1256 }
1257
85076754
MD		 1258 /*
1259 * If a non-default channel has been created in the
6ed2fd39 1260 * session, explicitly require that -c chan_name needs
85076754
MD		 1261 * to be provided.
1262 */
1263 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1264 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1290b5d8 1265 goto error_unlock;
85076754
MD		 1266 }
1267
2f77fc4b
DG		 1268 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1269 channel_name);
1270 if (uchan == NULL) {
f73fabfd 1271 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1290b5d8 1272 goto error_unlock;
2f77fc4b
DG		 1273 }
1274
6e911cad
MD		 1275 switch (event->type) {
1276 case LTTNG_EVENT_ALL:
82ba26e9
JR		 1277 /*
1278 * An empty event name means that everything
1279 * should be disabled.
1280 */
1281 if (event->name[0] == '\0') {
1282 ret = event_ust_disable_all_tracepoints(usess, uchan);
8bee8347
JR		 1283 } else {
1284 ret = event_ust_disable_tracepoint(usess, uchan,
1285 event_name);
1286 }
6e911cad 1287 if (ret != LTTNG_OK) {
1290b5d8 1288 goto error_unlock;
6e911cad
MD		 1289 }
1290 break;
1291 default:
1292 ret = LTTNG_ERR_UNK;
1290b5d8 1293 goto error_unlock;
2f77fc4b
DG		 1294 }
1295
1296 DBG3("Disable UST event %s in channel %s completed", event_name,
1297 channel_name);
1298 break;
1299 }
5cdb6027 1300 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1301 case LTTNG_DOMAIN_JUL:
0e115563 1302 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1303 {
fefd409b 1304 struct agent *agt;
f20baf8e
DG		 1305 struct ltt_ust_session *usess = session->ust_session;
1306
1307 assert(usess);
1308
6e911cad
MD		 1309 switch (event->type) {
1310 case LTTNG_EVENT_ALL:
1311 break;
1312 default:
1313 ret = LTTNG_ERR_UNK;
1290b5d8 1314 goto error_unlock;
6e911cad
MD		 1315 }
1316
5cdb6027 1317 agt = trace_ust_find_agent(usess, domain);
fefd409b
DG		 1318 if (!agt) {
1319 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
1290b5d8 1320 goto error_unlock;
fefd409b 1321 }
82ba26e9
JR		 1322 /*
1323 * An empty event name means that everything
1324 * should be disabled.
1325 */
1326 if (event->name[0] == '\0') {
18a720cd
MD		 1327 ret = event_agent_disable_all(usess, agt);
1328 } else {
1329 ret = event_agent_disable(usess, agt, event_name);
1330 }
f20baf8e 1331 if (ret != LTTNG_OK) {
1290b5d8 1332 goto error_unlock;
f20baf8e
DG		 1333 }
1334
1335 break;
1336 }
2f77fc4b 1337 default:
f73fabfd 1338 ret = LTTNG_ERR_UND;
1290b5d8 1339 goto error_unlock;
2f77fc4b
DG		 1340 }
1341
f73fabfd 1342 ret = LTTNG_OK;
2f77fc4b 1343
1290b5d8 1344error_unlock:
2223c96f 1345 rcu_read_unlock();
1290b5d8 1346error:
2f77fc4b
DG		 1347 return ret;
1348}
1349
2f77fc4b
DG		 1350/*
1351 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1352 */
1353int cmd_add_context(struct ltt_session *session, int domain,
601d5acf 1354 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
2f77fc4b 1355{
d5979e4a 1356 int ret, chan_kern_created = 0, chan_ust_created = 0;
2f77fc4b
DG		 1357
1358 switch (domain) {
1359 case LTTNG_DOMAIN_KERNEL:
979e618e
DG		 1360 assert(session->kernel_session);
1361
1362 if (session->kernel_session->channel_count == 0) {
1363 /* Create default channel */
1364 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1365 if (ret != LTTNG_OK) {
1366 goto error;
1367 }
d5979e4a 1368 chan_kern_created = 1;
979e618e 1369 }
2f77fc4b 1370 /* Add kernel context to kernel tracer */
601d5acf 1371 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1372 if (ret != LTTNG_OK) {
2f77fc4b
DG		 1373 goto error;
1374 }
1375 break;
1376 case LTTNG_DOMAIN_UST:
1377 {
1378 struct ltt_ust_session *usess = session->ust_session;
85076754
MD		 1379 unsigned int chan_count;
1380
2f77fc4b
DG		 1381 assert(usess);
1382
85076754 1383 chan_count = lttng_ht_get_count(usess->domain_global.channels);
979e618e
DG		 1384 if (chan_count == 0) {
1385 struct lttng_channel *attr;
1386 /* Create default channel */
0a9c6494 1387 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG		 1388 if (attr == NULL) {
1389 ret = LTTNG_ERR_FATAL;
1390 goto error;
1391 }
1392
7972aab2 1393 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG		 1394 if (ret != LTTNG_OK) {
1395 free(attr);
1396 goto error;
1397 }
1398 free(attr);
d5979e4a 1399 chan_ust_created = 1;
979e618e
DG		 1400 }
1401
601d5acf 1402 ret = context_ust_add(usess, domain, ctx, channel_name);
f73fabfd 1403 if (ret != LTTNG_OK) {
2f77fc4b
DG		 1404 goto error;
1405 }
1406 break;
1407 }
2f77fc4b 1408 default:
f73fabfd 1409 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 1410 goto error;
1411 }
1412
d5979e4a 1413 return LTTNG_OK;
2f77fc4b
DG		 1414
1415error:
d5979e4a
DG		 1416 if (chan_kern_created) {
1417 struct ltt_kernel_channel *kchan =
1418 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1419 session->kernel_session);
1420 /* Created previously, this should NOT fail. */
1421 assert(kchan);
1422 kernel_destroy_channel(kchan);
1423 }
1424
1425 if (chan_ust_created) {
1426 struct ltt_ust_channel *uchan =
1427 trace_ust_find_channel_by_name(
1428 session->ust_session->domain_global.channels,
1429 DEFAULT_CHANNEL_NAME);
1430 /* Created previously, this should NOT fail. */
1431 assert(uchan);
1432 /* Remove from the channel list of the session. */
1433 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1434 uchan);
1435 trace_ust_destroy_channel(uchan);
1436 }
2f77fc4b
DG		 1437 return ret;
1438}
1439
930a2e99
JG		 1440static int validate_event_name(const char *name)
1441{
1442 int ret = 0;
1443 const char *c = name;
1444 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
1445
1446 /*
1447 * Make sure that unescaped wildcards are only used as the last
1448 * character of the event name.
1449 */
1450 while (c < event_name_end) {
1451 switch (*c) {
1452 case '\0':
1453 goto end;
1454 case '\\':
1455 c++;
1456 break;
1457 case '*':
1458 if ((c + 1) < event_name_end && *(c + 1)) {
1459 /* Wildcard is not the last character */
1460 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1461 goto end;
1462 }
1463 default:
1464 break;
1465 }
1466 c++;
1467 }
1468end:
1469 return ret;
1470}
1471
c8100299
JG		 1472static inline bool name_starts_with(const char *name, const char *prefix)
1473{
1474 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1475
1476 return !strncmp(name, prefix, max_cmp_len);
1477}
1478
1479/* Perform userspace-specific event name validation */
1480static int validate_ust_event_name(const char *name)
1481{
1482 int ret = 0;
1483
1484 if (!name) {
1485 ret = -1;
1486 goto end;
1487 }
1488
1489 /*
1490 * Check name against all internal UST event component namespaces used
1491 * by the agents.
1492 */
1493 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1494 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1495 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1496 ret = -1;
1497 }
1498
1499end:
1500 return ret;
1501}
9732459c 1502
2f77fc4b 1503/*
9732459c
JG		 1504 * Internal version of cmd_enable_event() with a supplemental
1505 * "internal_event" flag which is used to enable internal events which should
1506 * be hidden from clients. Such events are used in the agent implementation to
1507 * enable the events through which all "agent" events are funeled.
2f77fc4b 1508 */
9732459c
JG		 1509static int _cmd_enable_event(struct ltt_session *session,
1510 struct lttng_domain *domain,
025faf73 1511 char *channel_name, struct lttng_event *event,
6b453b5e 1512 char *filter_expression,
db8f1377
JI		 1513 struct lttng_filter_bytecode *filter,
1514 struct lttng_event_exclusion *exclusion,
9732459c 1515 int wpipe, bool internal_event)
2f77fc4b 1516{
e5f5db7f 1517 int ret, channel_created = 0;
2f77fc4b
DG		 1518 struct lttng_channel *attr;
1519
1520 assert(session);
1521 assert(event);
1522 assert(channel_name);
1523
18a720cd
MD		 1524 DBG("Enable event command for event \'%s\'", event->name);
1525
57dc4ef3
MD		 1526 rcu_read_lock();
1527
930a2e99
JG		 1528 ret = validate_event_name(event->name);
1529 if (ret) {
1530 goto error;
1531 }
1532
7972aab2 1533 switch (domain->type) {
2f77fc4b
DG		 1534 case LTTNG_DOMAIN_KERNEL:
1535 {
1536 struct ltt_kernel_channel *kchan;
1537
85076754
MD		 1538 /*
1539 * If a non-default channel has been created in the
1540 * session, explicitely require that -c chan_name needs
1541 * to be provided.
1542 */
1543 if (session->kernel_session->has_non_default_channel
1544 && channel_name[0] == '\0') {
1545 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1546 goto error;
1547 }
1548
2f77fc4b
DG		 1549 kchan = trace_kernel_get_channel_by_name(channel_name,
1550 session->kernel_session);
1551 if (kchan == NULL) {
0a9c6494
DG		 1552 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1553 LTTNG_BUFFER_GLOBAL);
2f77fc4b 1554 if (attr == NULL) {
f73fabfd 1555 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 1556 goto error;
1557 }
1558 strncpy(attr->name, channel_name, sizeof(attr->name));
1559
1560 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1561 if (ret != LTTNG_OK) {
2f77fc4b
DG		 1562 free(attr);
1563 goto error;
1564 }
1565 free(attr);
e5f5db7f
DG		 1566
1567 channel_created = 1;
2f77fc4b
DG		 1568 }
1569
1570 /* Get the newly created kernel channel pointer */
1571 kchan = trace_kernel_get_channel_by_name(channel_name,
1572 session->kernel_session);
1573 if (kchan == NULL) {
1574 /* This sould not happen... */
f73fabfd 1575 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 1576 goto error;
1577 }
1578
6e911cad
MD		 1579 switch (event->type) {
1580 case LTTNG_EVENT_ALL:
29c62722 1581 {
00a62084
MD		 1582 char *filter_expression_a = NULL;
1583 struct lttng_filter_bytecode *filter_a = NULL;
1584
1585 /*
1586 * We need to duplicate filter_expression and filter,
1587 * because ownership is passed to first enable
1588 * event.
1589 */
1590 if (filter_expression) {
1591 filter_expression_a = strdup(filter_expression);
1592 if (!filter_expression_a) {
1593 ret = LTTNG_ERR_FATAL;
1594 goto error;
1595 }
1596 }
1597 if (filter) {
1598 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
1599 if (!filter_a) {
1600 free(filter_expression_a);
1601 ret = LTTNG_ERR_FATAL;
1602 goto error;
1603 }
1604 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
1605 }
29c62722 1606 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
00a62084
MD		 1607 ret = event_kernel_enable_event(kchan, event,
1608 filter_expression, filter);
a969e101
MD		 1609 /* We have passed ownership */
1610 filter_expression = NULL;
1611 filter = NULL;
29c62722
MD		 1612 if (ret != LTTNG_OK) {
1613 if (channel_created) {
1614 /* Let's not leak a useless channel. */
1615 kernel_destroy_channel(kchan);
1616 }
00a62084
MD		 1617 free(filter_expression_a);
1618 free(filter_a);
29c62722
MD		 1619 goto error;
1620 }
1621 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
00a62084
MD		 1622 ret = event_kernel_enable_event(kchan, event,
1623 filter_expression_a, filter_a);
0217a5a1
AB		 1624 /* We have passed ownership */
1625 filter_expression_a = NULL;
1626 filter_a = NULL;
29c62722
MD		 1627 if (ret != LTTNG_OK) {
1628 goto error;
1629 }
1630 break;
1631 }
6e6ef3d7
DG		 1632 case LTTNG_EVENT_PROBE:
1633 case LTTNG_EVENT_FUNCTION:
1634 case LTTNG_EVENT_FUNCTION_ENTRY:
6e911cad 1635 case LTTNG_EVENT_TRACEPOINT:
00a62084
MD		 1636 ret = event_kernel_enable_event(kchan, event,
1637 filter_expression, filter);
a969e101
MD		 1638 /* We have passed ownership */
1639 filter_expression = NULL;
1640 filter = NULL;
6e911cad
MD		 1641 if (ret != LTTNG_OK) {
1642 if (channel_created) {
1643 /* Let's not leak a useless channel. */
1644 kernel_destroy_channel(kchan);
1645 }
1646 goto error;
e5f5db7f 1647 }
6e911cad
MD		 1648 break;
1649 case LTTNG_EVENT_SYSCALL:
00a62084
MD		 1650 ret = event_kernel_enable_event(kchan, event,
1651 filter_expression, filter);
a969e101
MD		 1652 /* We have passed ownership */
1653 filter_expression = NULL;
1654 filter = NULL;
e2b957af
MD		 1655 if (ret != LTTNG_OK) {
1656 goto error;
1657 }
6e911cad
MD		 1658 break;
1659 default:
1660 ret = LTTNG_ERR_UNK;
2f77fc4b
DG		 1661 goto error;
1662 }
1663
1664 kernel_wait_quiescent(kernel_tracer_fd);
1665 break;
1666 }
1667 case LTTNG_DOMAIN_UST:
1668 {
1669 struct ltt_ust_channel *uchan;
1670 struct ltt_ust_session *usess = session->ust_session;
1671
1672 assert(usess);
1673
85076754
MD		 1674 /*
1675 * If a non-default channel has been created in the
1676 * session, explicitely require that -c chan_name needs
1677 * to be provided.
1678 */
1679 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1680 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1681 goto error;
1682 }
1683
2f77fc4b
DG		 1684 /* Get channel from global UST domain */
1685 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1686 channel_name);
1687 if (uchan == NULL) {
1688 /* Create default channel */
0a9c6494
DG		 1689 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1690 usess->buffer_type);
2f77fc4b 1691 if (attr == NULL) {
f73fabfd 1692 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 1693 goto error;
1694 }
1695 strncpy(attr->name, channel_name, sizeof(attr->name));
1696
1697 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1698 if (ret != LTTNG_OK) {
2f77fc4b
DG		 1699 free(attr);
1700 goto error;
1701 }
1702 free(attr);
1703
1704 /* Get the newly created channel reference back */
1705 uchan = trace_ust_find_channel_by_name(
1706 usess->domain_global.channels, channel_name);
1707 assert(uchan);
1708 }
1709
9ab6d7ea
JG		 1710 if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
1711 /*
1712 * Don't allow users to add UST events to channels which
1713 * are assigned to a userspace subdomain (JUL, Log4J,
1714 * Python, etc.).
1715 */
1716 ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
1717 goto error;
1718 }
1719
c8100299
JG		 1720 if (!internal_event) {
1721 /*
1722 * Ensure the event name is not reserved for internal
1723 * use.
1724 */
1725 ret = validate_ust_event_name(event->name);
1726 if (ret) {
1727 WARN("Userspace event name %s failed validation.",
1728 event->name ?
1729 event->name : "NULL");
1730 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1731 goto error;
1732 }
1733 }
1734
2f77fc4b 1735 /* At this point, the session and channel exist on the tracer */
6b453b5e 1736 ret = event_ust_enable_tracepoint(usess, uchan, event,
9732459c
JG		 1737 filter_expression, filter, exclusion,
1738 internal_event);
49d21f93
MD		 1739 /* We have passed ownership */
1740 filter_expression = NULL;
1741 filter = NULL;
1742 exclusion = NULL;
85f2f68c
JG		 1743 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
1744 goto already_enabled;
1745 } else if (ret != LTTNG_OK) {
2f77fc4b
DG		 1746 goto error;
1747 }
1748 break;
1749 }
5cdb6027 1750 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1751 case LTTNG_DOMAIN_JUL:
0e115563 1752 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1753 {
da6c3a50 1754 const char *default_event_name, *default_chan_name;
fefd409b 1755 struct agent *agt;
f20baf8e
DG		 1756 struct lttng_event uevent;
1757 struct lttng_domain tmp_dom;
1758 struct ltt_ust_session *usess = session->ust_session;
1759
1760 assert(usess);
1761
5cdb6027 1762 agt = trace_ust_find_agent(usess, domain->type);
fefd409b 1763 if (!agt) {
5cdb6027 1764 agt = agent_create(domain->type);
fefd409b 1765 if (!agt) {
948f8adb 1766 ret = LTTNG_ERR_NOMEM;
fefd409b
DG		 1767 goto error;
1768 }
1769 agent_add(agt, usess->agents);
1770 }
1771
022d91ba 1772 /* Create the default tracepoint. */
996de3c7 1773 memset(&uevent, 0, sizeof(uevent));
f20baf8e
DG		 1774 uevent.type = LTTNG_EVENT_TRACEPOINT;
1775 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
0a3fca4d
JG		 1776 default_event_name = event_get_default_agent_ust_name(
1777 domain->type);
da6c3a50 1778 if (!default_event_name) {
948f8adb 1779 ret = LTTNG_ERR_FATAL;
da6c3a50 1780 goto error;
f43f95a9 1781 }
da6c3a50 1782 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
f20baf8e
DG		 1783 uevent.name[sizeof(uevent.name) - 1] = '\0';
1784
1785 /*
1786 * The domain type is changed because we are about to enable the
1787 * default channel and event for the JUL domain that are hardcoded.
1788 * This happens in the UST domain.
1789 */
1790 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1791 tmp_dom.type = LTTNG_DOMAIN_UST;
1792
0e115563
DG		 1793 switch (domain->type) {
1794 case LTTNG_DOMAIN_LOG4J:
da6c3a50 1795 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG		 1796 break;
1797 case LTTNG_DOMAIN_JUL:
da6c3a50 1798 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
0e115563
DG		 1799 break;
1800 case LTTNG_DOMAIN_PYTHON:
1801 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
1802 break;
1803 default:
1804 /* The switch/case we are in should avoid this else big problem */
1805 assert(0);
da6c3a50
DG		 1806 }
1807
971da06a 1808 {
d75bffee 1809 char *filter_expression_copy = NULL;
0a3fca4d 1810 struct lttng_filter_bytecode *filter_copy = NULL;
971da06a
JG		 1811
1812 if (filter) {
0a3fca4d
JG		 1813 const size_t filter_size = sizeof(
1814 struct lttng_filter_bytecode)
1815 + filter->len;
1816
1817 filter_copy = zmalloc(filter_size);
971da06a 1818 if (!filter_copy) {
a745883a 1819 ret = LTTNG_ERR_NOMEM;
4c579b1f 1820 goto error;
971da06a 1821 }
0a3fca4d 1822 memcpy(filter_copy, filter, filter_size);
971da06a 1823
d75bffee
JG		 1824 filter_expression_copy =
1825 strdup(filter_expression);
1826 if (!filter_expression) {
1827 ret = LTTNG_ERR_NOMEM;
0a3fca4d
JG		 1828 }
1829
1830 if (!filter_expression_copy || !filter_copy) {
1831 free(filter_expression_copy);
1832 free(filter_copy);
1833 goto error;
d75bffee 1834 }
971da06a
JG		 1835 }
1836
9732459c 1837 ret = cmd_enable_event_internal(session, &tmp_dom,
971da06a 1838 (char *) default_chan_name,
d75bffee
JG		 1839 &uevent, filter_expression_copy,
1840 filter_copy, NULL, wpipe);
971da06a
JG		 1841 }
1842
85f2f68c
JG		 1843 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
1844 goto already_enabled;
1845 } else if (ret != LTTNG_OK) {
f20baf8e
DG		 1846 goto error;
1847 }
1848
1849 /* The wild card * means that everything should be enabled. */
1850 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
d75bffee
JG		 1851 ret = event_agent_enable_all(usess, agt, event, filter,
1852 filter_expression);
f20baf8e 1853 } else {
d75bffee
JG		 1854 ret = event_agent_enable(usess, agt, event, filter,
1855 filter_expression);
f20baf8e 1856 }
0a3fca4d
JG		 1857 filter = NULL;
1858 filter_expression = NULL;
f20baf8e
DG		 1859 if (ret != LTTNG_OK) {
1860 goto error;
1861 }
1862
1863 break;
1864 }
2f77fc4b 1865 default:
f73fabfd 1866 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 1867 goto error;
1868 }
1869
f73fabfd 1870 ret = LTTNG_OK;
2f77fc4b 1871
85f2f68c 1872already_enabled:
2f77fc4b 1873error:
49d21f93
MD		 1874 free(filter_expression);
1875 free(filter);
1876 free(exclusion);
2223c96f 1877 rcu_read_unlock();
2f77fc4b
DG		 1878 return ret;
1879}
1880
9732459c
JG		 1881/*
1882 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1883 * We own filter, exclusion, and filter_expression.
1884 */
1885int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1886 char *channel_name, struct lttng_event *event,
1887 char *filter_expression,
1888 struct lttng_filter_bytecode *filter,
1889 struct lttng_event_exclusion *exclusion,
1890 int wpipe)
1891{
1892 return _cmd_enable_event(session, domain, channel_name, event,
1893 filter_expression, filter, exclusion, wpipe, false);
1894}
1895
1896/*
1897 * Enable an event which is internal to LTTng. An internal should
1898 * never be made visible to clients and are immune to checks such as
1899 * reserved names.
1900 */
1901static int cmd_enable_event_internal(struct ltt_session *session,
1902 struct lttng_domain *domain,
1903 char *channel_name, struct lttng_event *event,
1904 char *filter_expression,
1905 struct lttng_filter_bytecode *filter,
1906 struct lttng_event_exclusion *exclusion,
1907 int wpipe)
1908{
1909 return _cmd_enable_event(session, domain, channel_name, event,
1910 filter_expression, filter, exclusion, wpipe, true);
1911}
1912
2f77fc4b
DG		 1913/*
1914 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1915 */
1916ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1917{
1918 int ret;
1919 ssize_t nb_events = 0;
1920
1921 switch (domain) {
1922 case LTTNG_DOMAIN_KERNEL:
1923 nb_events = kernel_list_events(kernel_tracer_fd, events);
1924 if (nb_events < 0) {
f73fabfd 1925 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG		 1926 goto error;
1927 }
1928 break;
1929 case LTTNG_DOMAIN_UST:
1930 nb_events = ust_app_list_events(events);
1931 if (nb_events < 0) {
f73fabfd 1932 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG		 1933 goto error;
1934 }
1935 break;
5cdb6027 1936 case LTTNG_DOMAIN_LOG4J:
3c6a091f 1937 case LTTNG_DOMAIN_JUL:
0e115563 1938 case LTTNG_DOMAIN_PYTHON:
f60140a1 1939 nb_events = agent_list_events(events, domain);
3c6a091f
DG		 1940 if (nb_events < 0) {
1941 ret = LTTNG_ERR_UST_LIST_FAIL;
1942 goto error;
1943 }
1944 break;
2f77fc4b 1945 default:
f73fabfd 1946 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 1947 goto error;
1948 }
1949
1950 return nb_events;
1951
1952error:
1953 /* Return negative value to differentiate return code */
1954 return -ret;
1955}
1956
1957/*
1958 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1959 */
1960ssize_t cmd_list_tracepoint_fields(int domain,
1961 struct lttng_event_field **fields)
1962{
1963 int ret;
1964 ssize_t nb_fields = 0;
1965
1966 switch (domain) {
1967 case LTTNG_DOMAIN_UST:
1968 nb_fields = ust_app_list_event_fields(fields);
1969 if (nb_fields < 0) {
f73fabfd 1970 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG		 1971 goto error;
1972 }
1973 break;
1974 case LTTNG_DOMAIN_KERNEL:
1975 default: /* fall-through */
f73fabfd 1976 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 1977 goto error;
1978 }
1979
1980 return nb_fields;
1981
1982error:
1983 /* Return negative value to differentiate return code */
1984 return -ret;
1985}
1986
834978fd
DG		 1987ssize_t cmd_list_syscalls(struct lttng_event **events)
1988{
1989 return syscall_table_list(events);
1990}
1991
a5dfbb9d
MD		 1992/*
1993 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
1994 *
1995 * Called with session lock held.
1996 */
1997ssize_t cmd_list_tracker_pids(struct ltt_session *session,
1998 int domain, int32_t **pids)
1999{
2000 int ret;
2001 ssize_t nr_pids = 0;
2002
2003 switch (domain) {
2004 case LTTNG_DOMAIN_KERNEL:
2005 {
2006 struct ltt_kernel_session *ksess;
2007
2008 ksess = session->kernel_session;
2009 nr_pids = kernel_list_tracker_pids(ksess, pids);
2010 if (nr_pids < 0) {
2011 ret = LTTNG_ERR_KERN_LIST_FAIL;
2012 goto error;
2013 }
2014 break;
2015 }
2016 case LTTNG_DOMAIN_UST:
2017 {
2018 struct ltt_ust_session *usess;
2019
2020 usess = session->ust_session;
2021 nr_pids = trace_ust_list_tracker_pids(usess, pids);
2022 if (nr_pids < 0) {
2023 ret = LTTNG_ERR_UST_LIST_FAIL;
2024 goto error;
2025 }
2026 break;
2027 }
2028 case LTTNG_DOMAIN_LOG4J:
2029 case LTTNG_DOMAIN_JUL:
2030 case LTTNG_DOMAIN_PYTHON:
2031 default:
2032 ret = LTTNG_ERR_UND;
2033 goto error;
2034 }
2035
2036 return nr_pids;
2037
2038error:
2039 /* Return negative value to differentiate return code */
2040 return -ret;
2041}
2042
2f77fc4b
DG		 2043/*
2044 * Command LTTNG_START_TRACE processed by the client thread.
a9ad0c8f
MD		 2045 *
2046 * Called with session mutex held.
2f77fc4b
DG		 2047 */
2048int cmd_start_trace(struct ltt_session *session)
2049{
2050 int ret;
cde3e505 2051 unsigned long nb_chan = 0;
2f77fc4b
DG		 2052 struct ltt_kernel_session *ksession;
2053 struct ltt_ust_session *usess;
2f77fc4b
DG		 2054
2055 assert(session);
2056
2057 /* Ease our life a bit ;) */
2058 ksession = session->kernel_session;
2059 usess = session->ust_session;
2060
8382cf6f
DG		 2061 /* Is the session already started? */
2062 if (session->active) {
f73fabfd 2063 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG		 2064 goto error;
2065 }
2066
cde3e505
DG		 2067 /*
2068 * Starting a session without channel is useless since after that it's not
2069 * possible to enable channel thus inform the client.
2070 */
2071 if (usess && usess->domain_global.channels) {
a9e41044 2072 rcu_read_lock();
cde3e505 2073 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
a9e41044 2074 rcu_read_unlock();
cde3e505
DG		 2075 }
2076 if (ksession) {
2077 nb_chan += ksession->channel_count;
2078 }
2079 if (!nb_chan) {
2080 ret = LTTNG_ERR_NO_CHANNEL;
2081 goto error;
2082 }
2083
2f77fc4b
DG		 2084 /* Kernel tracing */
2085 if (ksession != NULL) {
9b6c7ec5
DG		 2086 ret = start_kernel_session(ksession, kernel_tracer_fd);
2087 if (ret != LTTNG_OK) {
2f77fc4b
DG		 2088 goto error;
2089 }
2f77fc4b
DG		 2090 }
2091
2092 /* Flag session that trace should start automatically */
2093 if (usess) {
14fb1ebe
DG		 2094 /*
2095 * Even though the start trace might fail, flag this session active so
2096 * other application coming in are started by default.
2097 */
2098 usess->active = 1;
2f77fc4b
DG		 2099
2100 ret = ust_app_start_trace_all(usess);
2101 if (ret < 0) {
f73fabfd 2102 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG		 2103 goto error;
2104 }
2105 }
2106
8382cf6f
DG		 2107 /* Flag this after a successful start. */
2108 session->has_been_started = 1;
2109 session->active = 1;
9b6c7ec5 2110
f73fabfd 2111 ret = LTTNG_OK;
2f77fc4b
DG		 2112
2113error:
2114 return ret;
2115}
2116
2117/*
2118 * Command LTTNG_STOP_TRACE processed by the client thread.
2119 */
2120int cmd_stop_trace(struct ltt_session *session)
2121{
2122 int ret;
2123 struct ltt_kernel_channel *kchan;
2124 struct ltt_kernel_session *ksession;
2125 struct ltt_ust_session *usess;
2126
2127 assert(session);
2128
2129 /* Short cut */
2130 ksession = session->kernel_session;
2131 usess = session->ust_session;
2132
8382cf6f
DG		 2133 /* Session is not active. Skip everythong and inform the client. */
2134 if (!session->active) {
f73fabfd 2135 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG		 2136 goto error;
2137 }
2138
2f77fc4b 2139 /* Kernel tracer */
14fb1ebe 2140 if (ksession && ksession->active) {
2f77fc4b
DG		 2141 DBG("Stop kernel tracing");
2142
2143 /* Flush metadata if exist */
2144 if (ksession->metadata_stream_fd >= 0) {
2145 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2146 if (ret < 0) {
2147 ERR("Kernel metadata flush failed");
2148 }
2149 }
2150
2151 /* Flush all buffers before stopping */
2152 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2153 ret = kernel_flush_buffer(kchan);
2154 if (ret < 0) {
2155 ERR("Kernel flush buffer error");
2156 }
2157 }
2158
2159 ret = kernel_stop_session(ksession);
2160 if (ret < 0) {
f73fabfd 2161 ret = LTTNG_ERR_KERN_STOP_FAIL;
2f77fc4b
DG		 2162 goto error;
2163 }
2164
2165 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5 2166
14fb1ebe 2167 ksession->active = 0;
2f77fc4b
DG		 2168 }
2169
14fb1ebe
DG		 2170 if (usess && usess->active) {
2171 /*
2172 * Even though the stop trace might fail, flag this session inactive so
2173 * other application coming in are not started by default.
2174 */
2175 usess->active = 0;
2f77fc4b
DG		 2176
2177 ret = ust_app_stop_trace_all(usess);
2178 if (ret < 0) {
f73fabfd 2179 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG		 2180 goto error;
2181 }
2182 }
2183
8382cf6f
DG		 2184 /* Flag inactive after a successful stop. */
2185 session->active = 0;
f73fabfd 2186 ret = LTTNG_OK;
2f77fc4b
DG		 2187
2188error:
2189 return ret;
2190}
2191
2192/*
2193 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2194 */
bda32d56
JG		 2195int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2196 struct lttng_uri *uris)
2f77fc4b
DG		 2197{
2198 int ret, i;
2199 struct ltt_kernel_session *ksess = session->kernel_session;
2200 struct ltt_ust_session *usess = session->ust_session;
2f77fc4b
DG		 2201
2202 assert(session);
2203 assert(uris);
2204 assert(nb_uri > 0);
2205
8382cf6f
DG		 2206 /* Can't set consumer URI if the session is active. */
2207 if (session->active) {
f73fabfd 2208 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG		 2209 goto error;
2210 }
2211
bda32d56 2212 /* Set the "global" consumer URIs */
2f77fc4b 2213 for (i = 0; i < nb_uri; i++) {
bda32d56
JG		 2214 ret = add_uri_to_consumer(session->consumer,
2215 &uris[i], 0, session->name);
a74934ba 2216 if (ret != LTTNG_OK) {
2f77fc4b
DG		 2217 goto error;
2218 }
2f77fc4b
DG		 2219 }
2220
bda32d56
JG		 2221 /* Set UST session URIs */
2222 if (session->ust_session) {
2223 for (i = 0; i < nb_uri; i++) {
2224 ret = add_uri_to_consumer(
2225 session->ust_session->consumer,
2226 &uris[i], LTTNG_DOMAIN_UST,
2227 session->name);
2228 if (ret != LTTNG_OK) {
2229 goto error;
2230 }
2231 }
2232 }
2233
2234 /* Set kernel session URIs */
2235 if (session->kernel_session) {
2236 for (i = 0; i < nb_uri; i++) {
2237 ret = add_uri_to_consumer(
2238 session->kernel_session->consumer,
2239 &uris[i], LTTNG_DOMAIN_KERNEL,
2240 session->name);
2241 if (ret != LTTNG_OK) {
2242 goto error;
2243 }
2244 }
2245 }
2246
7ab70fe0
DG		 2247 /*
2248 * Make sure to set the session in output mode after we set URI since a
2249 * session can be created without URL (thus flagged in no output mode).
2250 */
2251 session->output_traces = 1;
2252 if (ksess) {
2253 ksess->output_traces = 1;
bda32d56
JG		 2254 }
2255
2256 if (usess) {
7ab70fe0
DG		 2257 usess->output_traces = 1;
2258 }
2259
2f77fc4b 2260 /* All good! */
f73fabfd 2261 ret = LTTNG_OK;
2f77fc4b
DG		 2262
2263error:
2264 return ret;
2265}
2266
2267/*
2268 * Command LTTNG_CREATE_SESSION processed by the client thread.
2269 */
2270int cmd_create_session_uri(char *name, struct lttng_uri *uris,
ecc48a90 2271 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2f77fc4b
DG		 2272{
2273 int ret;
2f77fc4b
DG		 2274 struct ltt_session *session;
2275
2276 assert(name);
2bba9e53 2277 assert(creds);
785d2d0d 2278
2f77fc4b
DG		 2279 /*
2280 * Verify if the session already exist
2281 *
2282 * XXX: There is no need for the session lock list here since the caller
2283 * (process_client_msg) is holding it. We might want to change that so a
2284 * single command does not lock the entire session list.
2285 */
2286 session = session_find_by_name(name);
2287 if (session != NULL) {
f73fabfd 2288 ret = LTTNG_ERR_EXIST_SESS;
2f77fc4b
DG		 2289 goto find_error;
2290 }
2291
2292 /* Create tracing session in the registry */
dec56f6c 2293 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2f77fc4b 2294 LTTNG_SOCK_GET_GID_CRED(creds));
f73fabfd 2295 if (ret != LTTNG_OK) {
2f77fc4b
DG		 2296 goto session_error;
2297 }
2298
2299 /*
2300 * Get the newly created session pointer back
2301 *
2302 * XXX: There is no need for the session lock list here since the caller
2303 * (process_client_msg) is holding it. We might want to change that so a
2304 * single command does not lock the entire session list.
2305 */
2306 session = session_find_by_name(name);
2307 assert(session);
2308
ecc48a90 2309 session->live_timer = live_timer;
2f77fc4b
DG		 2310 /* Create default consumer output for the session not yet created. */
2311 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2312 if (session->consumer == NULL) {
f73fabfd 2313 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 2314 goto consumer_error;
2315 }
2316
2bba9e53 2317 if (uris) {
bda32d56 2318 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2bba9e53
DG		 2319 if (ret != LTTNG_OK) {
2320 goto consumer_error;
2321 }
2322 session->output_traces = 1;
2323 } else {
2324 session->output_traces = 0;
2325 DBG2("Session %s created with no output", session->name);
2f77fc4b
DG		 2326 }
2327
2328 session->consumer->enabled = 1;
2329
f73fabfd 2330 return LTTNG_OK;
2f77fc4b
DG		 2331
2332consumer_error:
2333 session_destroy(session);
2334session_error:
2335find_error:
2336 return ret;
2337}
2338
27babd3a
DG		 2339/*
2340 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2341 */
2342int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2343 size_t nb_uri, lttng_sock_cred *creds)
2344{
2345 int ret;
2346 struct ltt_session *session;
2347 struct snapshot_output *new_output = NULL;
2348
2349 assert(name);
2350 assert(creds);
2351
2352 /*
2353 * Create session in no output mode with URIs set to NULL. The uris we've
2354 * received are for a default snapshot output if one.
2355 */
bfaba83f 2356 ret = cmd_create_session_uri(name, NULL, 0, creds, 0);
27babd3a
DG		 2357 if (ret != LTTNG_OK) {
2358 goto error;
2359 }
2360
2361 /* Get the newly created session pointer back. This should NEVER fail. */
2362 session = session_find_by_name(name);
2363 assert(session);
2364
2365 /* Flag session for snapshot mode. */
2366 session->snapshot_mode = 1;
2367
2368 /* Skip snapshot output creation if no URI is given. */
2369 if (nb_uri == 0) {
2370 goto end;
2371 }
2372
2373 new_output = snapshot_output_alloc();
2374 if (!new_output) {
2375 ret = LTTNG_ERR_NOMEM;
2376 goto error_snapshot_alloc;
2377 }
2378
2379 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2380 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2381 if (ret < 0) {
2382 if (ret == -ENOMEM) {
2383 ret = LTTNG_ERR_NOMEM;
2384 } else {
2385 ret = LTTNG_ERR_INVALID;
2386 }
2387 goto error_snapshot;
2388 }
2389
2390 rcu_read_lock();
2391 snapshot_add_output(&session->snapshot, new_output);
2392 rcu_read_unlock();
2393
2394end:
2395 return LTTNG_OK;
2396
2397error_snapshot:
2398 snapshot_output_destroy(new_output);
2399error_snapshot_alloc:
2400 session_destroy(session);
2401error:
2402 return ret;
2403}
2404
2f77fc4b
DG		 2405/*
2406 * Command LTTNG_DESTROY_SESSION processed by the client thread.
a9ad0c8f
MD		 2407 *
2408 * Called with session lock held.
2f77fc4b
DG		 2409 */
2410int cmd_destroy_session(struct ltt_session *session, int wpipe)
2411{
2412 int ret;
2413 struct ltt_ust_session *usess;
2414 struct ltt_kernel_session *ksess;
2415
2416 /* Safety net */
2417 assert(session);
2418
2419 usess = session->ust_session;
2420 ksess = session->kernel_session;
2421
2422 /* Clean kernel session teardown */
2423 kernel_destroy_session(ksess);
2424
2425 /* UST session teardown */
2426 if (usess) {
2427 /* Close any relayd session */
2428 consumer_output_send_destroy_relayd(usess->consumer);
2429
2430 /* Destroy every UST application related to this session. */
2431 ret = ust_app_destroy_trace_all(usess);
2432 if (ret) {
2433 ERR("Error in ust_app_destroy_trace_all");
2434 }
2435
2436 /* Clean up the rest. */
2437 trace_ust_destroy_session(usess);
2438 }
2439
2440 /*
2441 * Must notify the kernel thread here to update it's poll set in order to
2442 * remove the channel(s)' fd just destroyed.
2443 */
2444 ret = notify_thread_pipe(wpipe);
2445 if (ret < 0) {
2446 PERROR("write kernel poll pipe");
2447 }
2448
2449 ret = session_destroy(session);
2450
2451 return ret;
2452}
2453
2454/*
2455 * Command LTTNG_CALIBRATE processed by the client thread.
2456 */
2457int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2458{
2459 int ret;
2460
2461 switch (domain) {
2462 case LTTNG_DOMAIN_KERNEL:
2463 {
2464 struct lttng_kernel_calibrate kcalibrate;
2465
2e84128e
DG		 2466 switch (calibrate->type) {
2467 case LTTNG_CALIBRATE_FUNCTION:
2468 default:
2469 /* Default and only possible calibrate option. */
2470 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2471 break;
2472 }
2473
2f77fc4b
DG		 2474 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2475 if (ret < 0) {
f73fabfd 2476 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2f77fc4b
DG		 2477 goto error;
2478 }
2479 break;
2480 }
2481 case LTTNG_DOMAIN_UST:
2482 {
2483 struct lttng_ust_calibrate ucalibrate;
2484
2e84128e
DG		 2485 switch (calibrate->type) {
2486 case LTTNG_CALIBRATE_FUNCTION:
2487 default:
2488 /* Default and only possible calibrate option. */
2489 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2490 break;
2491 }
2492
2f77fc4b
DG		 2493 ret = ust_app_calibrate_glb(&ucalibrate);
2494 if (ret < 0) {
f73fabfd 2495 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2f77fc4b
DG		 2496 goto error;
2497 }
2498 break;
2499 }
2500 default:
f73fabfd 2501 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 2502 goto error;
2503 }
2504
f73fabfd 2505 ret = LTTNG_OK;
2f77fc4b
DG		 2506
2507error:
2508 return ret;
2509}
2510
2511/*
2512 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2513 */
2514int cmd_register_consumer(struct ltt_session *session, int domain,
2515 const char *sock_path, struct consumer_data *cdata)
2516{
2517 int ret, sock;
dd81b457 2518 struct consumer_socket *socket = NULL;
2f77fc4b
DG		 2519
2520 assert(session);
2521 assert(cdata);
2522 assert(sock_path);
2523
2524 switch (domain) {
2525 case LTTNG_DOMAIN_KERNEL:
2526 {
2527 struct ltt_kernel_session *ksess = session->kernel_session;
2528
2529 assert(ksess);
2530
2531 /* Can't register a consumer if there is already one */
2532 if (ksess->consumer_fds_sent != 0) {
f73fabfd 2533 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG		 2534 goto error;
2535 }
2536
2537 sock = lttcomm_connect_unix_sock(sock_path);
2538 if (sock < 0) {
f73fabfd 2539 ret = LTTNG_ERR_CONNECT_FAIL;
2f77fc4b
DG		 2540 goto error;
2541 }
4ce514c4 2542 cdata->cmd_sock = sock;
2f77fc4b 2543
4ce514c4 2544 socket = consumer_allocate_socket(&cdata->cmd_sock);
2f77fc4b 2545 if (socket == NULL) {
f66c074c
DG		 2546 ret = close(sock);
2547 if (ret < 0) {
2548 PERROR("close register consumer");
2549 }
4ce514c4 2550 cdata->cmd_sock = -1;
f73fabfd 2551 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 2552 goto error;
2553 }
2554
2555 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2556 if (socket->lock == NULL) {
2557 PERROR("zmalloc pthread mutex");
f73fabfd 2558 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 2559 goto error;
2560 }
2561 pthread_mutex_init(socket->lock, NULL);
2562 socket->registered = 1;
2563
2564 rcu_read_lock();
2565 consumer_add_socket(socket, ksess->consumer);
2566 rcu_read_unlock();
2567
2568 pthread_mutex_lock(&cdata->pid_mutex);
2569 cdata->pid = -1;
2570 pthread_mutex_unlock(&cdata->pid_mutex);
2571
2572 break;
2573 }
2574 default:
2575 /* TODO: Userspace tracing */
f73fabfd 2576 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 2577 goto error;
2578 }
2579
dd81b457 2580 return LTTNG_OK;
2f77fc4b
DG		 2581
2582error:
dd81b457
DG		 2583 if (socket) {
2584 consumer_destroy_socket(socket);
2585 }
2f77fc4b
DG		 2586 return ret;
2587}
2588
2589/*
2590 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2591 */
2592ssize_t cmd_list_domains(struct ltt_session *session,
2593 struct lttng_domain **domains)
2594{
2595 int ret, index = 0;
2596 ssize_t nb_dom = 0;
fefd409b
DG		 2597 struct agent *agt;
2598 struct lttng_ht_iter iter;
2f77fc4b
DG		 2599
2600 if (session->kernel_session != NULL) {
2601 DBG3("Listing domains found kernel domain");
2602 nb_dom++;
2603 }
2604
2605 if (session->ust_session != NULL) {
2606 DBG3("Listing domains found UST global domain");
2607 nb_dom++;
3c6a091f 2608
e0a74f01 2609 rcu_read_lock();
fefd409b
DG		 2610 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2611 agt, node.node) {
2612 if (agt->being_used) {
2613 nb_dom++;
2614 }
3c6a091f 2615 }
e0a74f01 2616 rcu_read_unlock();
2f77fc4b
DG		 2617 }
2618
fa64dfb4
JG		 2619 if (!nb_dom) {
2620 goto end;
2621 }
2622
2f77fc4b
DG		 2623 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2624 if (*domains == NULL) {
f73fabfd 2625 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 2626 goto error;
2627 }
2628
2629 if (session->kernel_session != NULL) {
2630 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
bd3381e3
PP		 2631
2632 /* Kernel session buffer type is always GLOBAL */
2633 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
2634
2f77fc4b
DG		 2635 index++;
2636 }
2637
2638 if (session->ust_session != NULL) {
2639 (*domains)[index].type = LTTNG_DOMAIN_UST;
88c5f0d8 2640 (*domains)[index].buf_type = session->ust_session->buffer_type;
2f77fc4b 2641 index++;
3c6a091f 2642
e0a74f01 2643 rcu_read_lock();
fefd409b
DG		 2644 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2645 agt, node.node) {
2646 if (agt->being_used) {
2647 (*domains)[index].type = agt->domain;
2648 (*domains)[index].buf_type = session->ust_session->buffer_type;
2649 index++;
2650 }
3c6a091f 2651 }
e0a74f01 2652 rcu_read_unlock();
2f77fc4b 2653 }
fa64dfb4 2654end:
2f77fc4b
DG		 2655 return nb_dom;
2656
2657error:
f73fabfd
DG		 2658 /* Return negative value to differentiate return code */
2659 return -ret;
2f77fc4b
DG		 2660}
2661
2662
2663/*
2664 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2665 */
2666ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2667 struct lttng_channel **channels)
2668{
2669 int ret;
2670 ssize_t nb_chan = 0;
2671
2672 switch (domain) {
2673 case LTTNG_DOMAIN_KERNEL:
2674 if (session->kernel_session != NULL) {
2675 nb_chan = session->kernel_session->channel_count;
2676 }
2677 DBG3("Number of kernel channels %zd", nb_chan);
c7d620a2
DG		 2678 if (nb_chan <= 0) {
2679 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2680 }
2f77fc4b
DG		 2681 break;
2682 case LTTNG_DOMAIN_UST:
2683 if (session->ust_session != NULL) {
7ffc31a2 2684 rcu_read_lock();
2f77fc4b 2685 nb_chan = lttng_ht_get_count(
7ffc31a2
JG		 2686 session->ust_session->domain_global.channels);
2687 rcu_read_unlock();
2f77fc4b
DG		 2688 }
2689 DBG3("Number of UST global channels %zd", nb_chan);
ade7ce52 2690 if (nb_chan < 0) {
c7d620a2 2691 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
ade7ce52 2692 goto error;
c7d620a2 2693 }
2f77fc4b
DG		 2694 break;
2695 default:
f73fabfd 2696 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 2697 goto error;
2698 }
2699
2700 if (nb_chan > 0) {
2701 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2702 if (*channels == NULL) {
f73fabfd 2703 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 2704 goto error;
2705 }
2706
2707 list_lttng_channels(domain, session, *channels);
2f77fc4b
DG		 2708 }
2709
2710 return nb_chan;
2711
2712error:
f73fabfd
DG		 2713 /* Return negative value to differentiate return code */
2714 return -ret;
2f77fc4b
DG		 2715}
2716
2717/*
2718 * Command LTTNG_LIST_EVENTS processed by the client thread.
2719 */
2720ssize_t cmd_list_events(int domain, struct ltt_session *session,
2721 char *channel_name, struct lttng_event **events)
2722{
2723 int ret = 0;
2724 ssize_t nb_event = 0;
2725
2726 switch (domain) {
2727 case LTTNG_DOMAIN_KERNEL:
2728 if (session->kernel_session != NULL) {
2729 nb_event = list_lttng_kernel_events(channel_name,
2730 session->kernel_session, events);
2731 }
2732 break;
2733 case LTTNG_DOMAIN_UST:
2734 {
2735 if (session->ust_session != NULL) {
2736 nb_event = list_lttng_ust_global_events(channel_name,
2737 &session->ust_session->domain_global, events);
2738 }
2739 break;
2740 }
5cdb6027 2741 case LTTNG_DOMAIN_LOG4J:
3c6a091f 2742 case LTTNG_DOMAIN_JUL:
0e115563 2743 case LTTNG_DOMAIN_PYTHON:
3c6a091f 2744 if (session->ust_session) {
fefd409b
DG		 2745 struct lttng_ht_iter iter;
2746 struct agent *agt;
2747
b11feea5 2748 rcu_read_lock();
fefd409b
DG		 2749 cds_lfht_for_each_entry(session->ust_session->agents->ht,
2750 &iter.iter, agt, node.node) {
d8366880
JG		 2751 if (agt->domain == domain) {
2752 nb_event = list_lttng_agent_events(
2753 agt, events);
2754 break;
2755 }
fefd409b 2756 }
b11feea5 2757 rcu_read_unlock();
3c6a091f
DG		 2758 }
2759 break;
2f77fc4b 2760 default:
f73fabfd 2761 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 2762 goto error;
2763 }
2764
f73fabfd 2765 return nb_event;
2f77fc4b
DG		 2766
2767error:
f73fabfd
DG		 2768 /* Return negative value to differentiate return code */
2769 return -ret;
2f77fc4b
DG		 2770}
2771
2772/*
2773 * Using the session list, filled a lttng_session array to send back to the
2774 * client for session listing.
2775 *
2776 * The session list lock MUST be acquired before calling this function. Use
2777 * session_lock_list() and session_unlock_list().
2778 */
2779void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2780 gid_t gid)
2781{
2782 int ret;
2783 unsigned int i = 0;
2784 struct ltt_session *session;
2785 struct ltt_session_list *list = session_get_list();
2786
2787 DBG("Getting all available session for UID %d GID %d",
2788 uid, gid);
2789 /*
2790 * Iterate over session list and append data after the control struct in
2791 * the buffer.
2792 */
2793 cds_list_for_each_entry(session, &list->head, list) {
2794 /*
2795 * Only list the sessions the user can control.
2796 */
2797 if (!session_access_ok(session, uid, gid)) {
2798 continue;
2799 }
2800
2801 struct ltt_kernel_session *ksess = session->kernel_session;
2802 struct ltt_ust_session *usess = session->ust_session;
2803
2804 if (session->consumer->type == CONSUMER_DST_NET ||
2805 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2806 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2807 ret = build_network_session_path(sessions[i].path,
dec56f6c 2808 sizeof(sessions[i].path), session);
2f77fc4b 2809 } else {
dec56f6c 2810 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2f77fc4b
DG		 2811 session->consumer->dst.trace_path);
2812 }
2813 if (ret < 0) {
2814 PERROR("snprintf session path");
2815 continue;
2816 }
2817
2818 strncpy(sessions[i].name, session->name, NAME_MAX);
2819 sessions[i].name[NAME_MAX - 1] = '\0';
8382cf6f 2820 sessions[i].enabled = session->active;
2cbf8fed 2821 sessions[i].snapshot_mode = session->snapshot_mode;
8960e9cd 2822 sessions[i].live_timer_interval = session->live_timer;
2f77fc4b
DG		 2823 i++;
2824 }
2825}
2826
806e2684 2827/*
6d805429 2828 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
d3f14b8a 2829 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
806e2684 2830 */
6d805429 2831int cmd_data_pending(struct ltt_session *session)
806e2684
DG		 2832{
2833 int ret;
2834 struct ltt_kernel_session *ksess = session->kernel_session;
2835 struct ltt_ust_session *usess = session->ust_session;
2836
2837 assert(session);
2838
2839 /* Session MUST be stopped to ask for data availability. */
8382cf6f 2840 if (session->active) {
806e2684
DG		 2841 ret = LTTNG_ERR_SESSION_STARTED;
2842 goto error;
3a89d11a
DG		 2843 } else {
2844 /*
2845 * If stopped, just make sure we've started before else the above call
2846 * will always send that there is data pending.
2847 *
2848 * The consumer assumes that when the data pending command is received,
2849 * the trace has been started before or else no output data is written
2850 * by the streams which is a condition for data pending. So, this is
2851 * *VERY* important that we don't ask the consumer before a start
2852 * trace.
2853 */
8382cf6f 2854 if (!session->has_been_started) {
3a89d11a
DG		 2855 ret = 0;
2856 goto error;
2857 }
806e2684
DG		 2858 }
2859
2860 if (ksess && ksess->consumer) {
6d805429
DG		 2861 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2862 if (ret == 1) {
806e2684
DG		 2863 /* Data is still being extracted for the kernel. */
2864 goto error;
2865 }
2866 }
2867
2868 if (usess && usess->consumer) {
6d805429
DG		 2869 ret = consumer_is_data_pending(usess->id, usess->consumer);
2870 if (ret == 1) {
806e2684
DG		 2871 /* Data is still being extracted for the kernel. */
2872 goto error;
2873 }
2874 }
2875
2876 /* Data is ready to be read by a viewer */
6d805429 2877 ret = 0;
806e2684
DG		 2878
2879error:
2880 return ret;
2881}
2882
6dc3064a
DG		 2883/*
2884 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2885 *
2886 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2887 */
2888int cmd_snapshot_add_output(struct ltt_session *session,
2889 struct lttng_snapshot_output *output, uint32_t *id)
2890{
2891 int ret;
2892 struct snapshot_output *new_output;
2893
2894 assert(session);
2895 assert(output);
2896
2897 DBG("Cmd snapshot add output for session %s", session->name);
2898
2899 /*
d3f14b8a
MD		 2900 * Permission denied to create an output if the session is not
2901 * set in no output mode.
6dc3064a
DG		 2902 */
2903 if (session->output_traces) {
2904 ret = LTTNG_ERR_EPERM;
2905 goto error;
2906 }
2907
2908 /* Only one output is allowed until we have the "tee" feature. */
2909 if (session->snapshot.nb_output == 1) {
2910 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2911 goto error;
2912 }
2913
2914 new_output = snapshot_output_alloc();
2915 if (!new_output) {
2916 ret = LTTNG_ERR_NOMEM;
2917 goto error;
2918 }
2919
2920 ret = snapshot_output_init(output->max_size, output->name,
2921 output->ctrl_url, output->data_url, session->consumer, new_output,
2922 &session->snapshot);
2923 if (ret < 0) {
2924 if (ret == -ENOMEM) {
2925 ret = LTTNG_ERR_NOMEM;
2926 } else {
2927 ret = LTTNG_ERR_INVALID;
2928 }
2929 goto free_error;
2930 }
2931
6dc3064a
DG		 2932 rcu_read_lock();
2933 snapshot_add_output(&session->snapshot, new_output);
2934 if (id) {
2935 *id = new_output->id;
2936 }
2937 rcu_read_unlock();
2938
2939 return LTTNG_OK;
2940
2941free_error:
2942 snapshot_output_destroy(new_output);
2943error:
2944 return ret;
2945}
2946
2947/*
2948 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2949 *
2950 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2951 */
2952int cmd_snapshot_del_output(struct ltt_session *session,
2953 struct lttng_snapshot_output *output)
2954{
2955 int ret;
eb240553 2956 struct snapshot_output *sout = NULL;
6dc3064a
DG		 2957
2958 assert(session);
2959 assert(output);
2960
6dc3064a
DG		 2961 rcu_read_lock();
2962
2963 /*
d3f14b8a
MD		 2964 * Permission denied to create an output if the session is not
2965 * set in no output mode.
6dc3064a
DG		 2966 */
2967 if (session->output_traces) {
2968 ret = LTTNG_ERR_EPERM;
2969 goto error;
2970 }
2971
eb240553
DG		 2972 if (output->id) {
2973 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2974 session->name);
2975 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2976 } else if (*output->name != '\0') {
2977 DBG("Cmd snapshot del output name %s for session %s", output->name,
2978 session->name);
2979 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2980 }
6dc3064a
DG		 2981 if (!sout) {
2982 ret = LTTNG_ERR_INVALID;
2983 goto error;
2984 }
2985
2986 snapshot_delete_output(&session->snapshot, sout);
2987 snapshot_output_destroy(sout);
2988 ret = LTTNG_OK;
2989
2990error:
2991 rcu_read_unlock();
2992 return ret;
2993}
2994
2995/*
2996 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2997 *
2998 * If no output is available, outputs is untouched and 0 is returned.
2999 *
3000 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3001 */
3002ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
3003 struct lttng_snapshot_output **outputs)
3004{
3005 int ret, idx = 0;
b223ca94 3006 struct lttng_snapshot_output *list = NULL;
6dc3064a
DG		 3007 struct lttng_ht_iter iter;
3008 struct snapshot_output *output;
3009
3010 assert(session);
3011 assert(outputs);
3012
3013 DBG("Cmd snapshot list outputs for session %s", session->name);
3014
3015 /*
d3f14b8a
MD		 3016 * Permission denied to create an output if the session is not
3017 * set in no output mode.
6dc3064a
DG		 3018 */
3019 if (session->output_traces) {
b223ca94 3020 ret = -LTTNG_ERR_EPERM;
6dc3064a
DG		 3021 goto error;
3022 }
3023
3024 if (session->snapshot.nb_output == 0) {
3025 ret = 0;
3026 goto error;
3027 }
3028
3029 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
3030 if (!list) {
b223ca94 3031 ret = -LTTNG_ERR_NOMEM;
6dc3064a
DG		 3032 goto error;
3033 }
3034
3035 /* Copy list from session to the new list object. */
b223ca94 3036 rcu_read_lock();
6dc3064a
DG		 3037 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
3038 output, node.node) {
3039 assert(output->consumer);
3040 list[idx].id = output->id;
3041 list[idx].max_size = output->max_size;
3042 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
3043 if (output->consumer->type == CONSUMER_DST_LOCAL) {
3044 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
3045 sizeof(list[idx].ctrl_url));
3046 } else {
3047 /* Control URI. */
3048 ret = uri_to_str_url(&output->consumer->dst.net.control,
3049 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
3050 if (ret < 0) {
b223ca94
JG		 3051 ret = -LTTNG_ERR_NOMEM;
3052 goto error;
6dc3064a
DG		 3053 }
3054
3055 /* Data URI. */
3056 ret = uri_to_str_url(&output->consumer->dst.net.data,
3057 list[idx].data_url, sizeof(list[idx].data_url));
3058 if (ret < 0) {
b223ca94
JG		 3059 ret = -LTTNG_ERR_NOMEM;
3060 goto error;
6dc3064a
DG		 3061 }
3062 }
3063 idx++;
3064 }
3065
3066 *outputs = list;
b223ca94
JG		 3067 list = NULL;
3068 ret = session->snapshot.nb_output;
6dc3064a 3069error:
b223ca94
JG		 3070 free(list);
3071 rcu_read_unlock();
3072 return ret;
6dc3064a
DG		 3073}
3074
3075/*
3076 * Send relayd sockets from snapshot output to consumer. Ignore request if the
3077 * snapshot output is *not* set with a remote destination.
3078 *
a934f4af 3079 * Return 0 on success or a LTTNG_ERR code.
6dc3064a
DG		 3080 */
3081static int set_relayd_for_snapshot(struct consumer_output *consumer,
3082 struct snapshot_output *snap_output, struct ltt_session *session)
3083{
a934f4af 3084 int ret = LTTNG_OK;
6dc3064a
DG		 3085 struct lttng_ht_iter iter;
3086 struct consumer_socket *socket;
3087
3088 assert(consumer);
3089 assert(snap_output);
3090 assert(session);
3091
3092 DBG2("Set relayd object from snapshot output");
3093
3094 /* Ignore if snapshot consumer output is not network. */
3095 if (snap_output->consumer->type != CONSUMER_DST_NET) {
3096 goto error;
3097 }
3098
3099 /*
3100 * For each consumer socket, create and send the relayd object of the
3101 * snapshot output.
3102 */
3103 rcu_read_lock();
5eecee74
DG		 3104 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
3105 socket, node.node) {
6dc3064a 3106 ret = send_consumer_relayd_sockets(0, session->id,
d3e2ba59
JD		 3107 snap_output->consumer, socket,
3108 session->name, session->hostname,
3109 session->live_timer);
a934f4af 3110 if (ret != LTTNG_OK) {
6dc3064a
DG		 3111 rcu_read_unlock();
3112 goto error;
3113 }
3114 }
3115 rcu_read_unlock();
3116
3117error:
3118 return ret;
3119}
3120
3121/*
3122 * Record a kernel snapshot.
3123 *
fac41e72 3124 * Return LTTNG_OK on success or a LTTNG_ERR code.
6dc3064a
DG		 3125 */
3126static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
5c786ded 3127 struct snapshot_output *output, struct ltt_session *session,
d07ceecd 3128 int wait, uint64_t nb_packets_per_stream)
6dc3064a
DG		 3129{
3130 int ret;
3131
3132 assert(ksess);
3133 assert(output);
3134 assert(session);
3135
10a50311
JD		 3136 /* Get the datetime for the snapshot output directory. */
3137 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
3138 sizeof(output->datetime));
3139 if (!ret) {
a934f4af 3140 ret = LTTNG_ERR_INVALID;
10a50311
JD		 3141 goto error;
3142 }
3143
af706bb7
DG		 3144 /*
3145 * Copy kernel session sockets so we can communicate with the right
3146 * consumer for the snapshot record command.
3147 */
3148 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
3149 if (ret < 0) {
a934f4af 3150 ret = LTTNG_ERR_NOMEM;
af706bb7 3151 goto error;
6dc3064a
DG		 3152 }
3153
3154 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
a934f4af 3155 if (ret != LTTNG_OK) {
af706bb7 3156 goto error_snapshot;
6dc3064a
DG		 3157 }
3158
d07ceecd 3159 ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream);
2a06df8d 3160 if (ret != LTTNG_OK) {
af706bb7 3161 goto error_snapshot;
6dc3064a
DG		 3162 }
3163
a934f4af 3164 ret = LTTNG_OK;
1371fc12 3165 goto end;
a934f4af 3166
af706bb7
DG		 3167error_snapshot:
3168 /* Clean up copied sockets so this output can use some other later on. */
3169 consumer_destroy_output_sockets(output->consumer);
6dc3064a 3170error:
1371fc12 3171end:
6dc3064a
DG		 3172 return ret;
3173}
3174
3175/*
3176 * Record a UST snapshot.
3177 *
a934f4af 3178 * Return 0 on success or a LTTNG_ERR error code.
6dc3064a
DG		 3179 */
3180static int record_ust_snapshot(struct ltt_ust_session *usess,
5c786ded 3181 struct snapshot_output *output, struct ltt_session *session,
d07ceecd 3182 int wait, uint64_t nb_packets_per_stream)
6dc3064a
DG		 3183{
3184 int ret;
3185
3186 assert(usess);
3187 assert(output);
3188 assert(session);
3189
10a50311
JD		 3190 /* Get the datetime for the snapshot output directory. */
3191 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
3192 sizeof(output->datetime));
3193 if (!ret) {
a934f4af 3194 ret = LTTNG_ERR_INVALID;
10a50311
JD		 3195 goto error;
3196 }
3197
af706bb7 3198 /*
d3f14b8a 3199 * Copy UST session sockets so we can communicate with the right
af706bb7
DG		 3200 * consumer for the snapshot record command.
3201 */
3202 ret = consumer_copy_sockets(output->consumer, usess->consumer);
3203 if (ret < 0) {
a934f4af 3204 ret = LTTNG_ERR_NOMEM;
af706bb7 3205 goto error;
6dc3064a
DG		 3206 }
3207
3208 ret = set_relayd_for_snapshot(usess->consumer, output, session);
a934f4af 3209 if (ret != LTTNG_OK) {
af706bb7 3210 goto error_snapshot;
6dc3064a
DG		 3211 }
3212
d07ceecd 3213 ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream);
6dc3064a 3214 if (ret < 0) {
7badf927
DG		 3215 switch (-ret) {
3216 case EINVAL:
a934f4af 3217 ret = LTTNG_ERR_INVALID;
7badf927
DG		 3218 break;
3219 case ENODATA:
3220 ret = LTTNG_ERR_SNAPSHOT_NODATA;
3221 break;
3222 default:
3223 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3224 break;
5c786ded 3225 }
af706bb7 3226 goto error_snapshot;
6dc3064a
DG		 3227 }
3228
a934f4af
DG		 3229 ret = LTTNG_OK;
3230
af706bb7
DG		 3231error_snapshot:
3232 /* Clean up copied sockets so this output can use some other later on. */
3233 consumer_destroy_output_sockets(output->consumer);
6dc3064a
DG		 3234error:
3235 return ret;
3236}
3237
d07ceecd
MD		 3238static
3239uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session,
3240 uint64_t cur_nr_packets)
68808f4e 3241{
d07ceecd 3242 uint64_t tot_size = 0;
68808f4e
DG		 3243
3244 if (session->kernel_session) {
3245 struct ltt_kernel_channel *chan;
3246 struct ltt_kernel_session *ksess = session->kernel_session;
3247
68808f4e 3248 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
d07ceecd
MD		 3249 if (cur_nr_packets >= chan->channel->attr.num_subbuf) {
3250 /*
3251 * Don't take channel into account if we
3252 * already grab all its packets.
3253 */
3254 continue;
68808f4e 3255 }
d07ceecd
MD		 3256 tot_size += chan->channel->attr.subbuf_size
3257 * chan->stream_count;
68808f4e
DG		 3258 }
3259 }
3260
3261 if (session->ust_session) {
68808f4e
DG		 3262 struct ltt_ust_session *usess = session->ust_session;
3263
d07ceecd
MD		 3264 tot_size += ust_app_get_size_one_more_packet_per_stream(usess,
3265 cur_nr_packets);
68808f4e
DG		 3266 }
3267
d07ceecd 3268 return tot_size;
68808f4e
DG		 3269}
3270
5c786ded 3271/*
d07ceecd
MD		 3272 * Calculate the number of packets we can grab from each stream that
3273 * fits within the overall snapshot max size.
3274 *
3275 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
3276 * the number of packets per stream.
3277 *
3278 * TODO: this approach is not perfect: we consider the worse case
3279 * (packet filling the sub-buffers) as an upper bound, but we could do
3280 * better if we do this calculation while we actually grab the packet
3281 * content: we would know how much padding we don't actually store into
3282 * the file.
3283 *
3284 * This algorithm is currently bounded by the number of packets per
3285 * stream.
3286 *
3287 * Since we call this algorithm before actually grabbing the data, it's
3288 * an approximation: for instance, applications could appear/disappear
3289 * in between this call and actually grabbing data.
5c786ded 3290 */
d07ceecd
MD		 3291static
3292int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size)
5c786ded 3293{
d07ceecd
MD		 3294 int64_t size_left;
3295 uint64_t cur_nb_packets = 0;
5c786ded 3296
d07ceecd
MD		 3297 if (!max_size) {
3298 return 0; /* Infinite */
5c786ded
JD		 3299 }
3300
d07ceecd
MD		 3301 size_left = max_size;
3302 for (;;) {
3303 uint64_t one_more_packet_tot_size;
5c786ded 3304
d07ceecd
MD		 3305 one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session,
3306 cur_nb_packets);
3307 if (!one_more_packet_tot_size) {
3308 /* We are already grabbing all packets. */
3309 break;
3310 }
3311 size_left -= one_more_packet_tot_size;
3312 if (size_left < 0) {
3313 break;
3314 }
3315 cur_nb_packets++;
5c786ded 3316 }
d07ceecd
MD		 3317 if (!cur_nb_packets) {
3318 /* Not enough room to grab one packet of each stream, error. */
3319 return -1;
3320 }
3321 return cur_nb_packets;
5c786ded
JD		 3322}
3323
6dc3064a
DG		 3324/*
3325 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3326 *
3327 * The wait parameter is ignored so this call always wait for the snapshot to
3328 * complete before returning.
3329 *
3330 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3331 */
3332int cmd_snapshot_record(struct ltt_session *session,
3333 struct lttng_snapshot_output *output, int wait)
3334{
3335 int ret = LTTNG_OK;
e1986656
DG		 3336 unsigned int use_tmp_output = 0;
3337 struct snapshot_output tmp_output;
00e1dfc4 3338 unsigned int snapshot_success = 0;
6dc3064a
DG		 3339
3340 assert(session);
ba45d9f0 3341 assert(output);
6dc3064a
DG		 3342
3343 DBG("Cmd snapshot record for session %s", session->name);
3344
3345 /*
d3f14b8a
MD		 3346 * Permission denied to create an output if the session is not
3347 * set in no output mode.
6dc3064a
DG		 3348 */
3349 if (session->output_traces) {
3350 ret = LTTNG_ERR_EPERM;
3351 goto error;
3352 }
3353
3354 /* The session needs to be started at least once. */
8382cf6f 3355 if (!session->has_been_started) {
6dc3064a
DG		 3356 ret = LTTNG_ERR_START_SESSION_ONCE;
3357 goto error;
3358 }
3359
3360 /* Use temporary output for the session. */
ba45d9f0 3361 if (*output->ctrl_url != '\0') {
6dc3064a
DG		 3362 ret = snapshot_output_init(output->max_size, output->name,
3363 output->ctrl_url, output->data_url, session->consumer,
e1986656 3364 &tmp_output, NULL);
6dc3064a
DG		 3365 if (ret < 0) {
3366 if (ret == -ENOMEM) {
3367 ret = LTTNG_ERR_NOMEM;
3368 } else {
3369 ret = LTTNG_ERR_INVALID;
3370 }
3371 goto error;
3372 }
1bfe7328
DG		 3373 /* Use the global session count for the temporary snapshot. */
3374 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
e1986656 3375 use_tmp_output = 1;
6dc3064a
DG		 3376 }
3377
3378 if (session->kernel_session) {
3379 struct ltt_kernel_session *ksess = session->kernel_session;
3380
e1986656 3381 if (use_tmp_output) {
d07ceecd
MD		 3382 int64_t nb_packets_per_stream;
3383
3384 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3385 tmp_output.max_size);
3386 if (nb_packets_per_stream < 0) {
3387 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3388 goto error;
3389 }
e1986656 3390 ret = record_kernel_snapshot(ksess, &tmp_output, session,
d07ceecd 3391 wait, nb_packets_per_stream);
a934f4af 3392 if (ret != LTTNG_OK) {
6dc3064a
DG		 3393 goto error;
3394 }
1bfe7328 3395 snapshot_success = 1;
6dc3064a
DG		 3396 } else {
3397 struct snapshot_output *sout;
3398 struct lttng_ht_iter iter;
3399
3400 rcu_read_lock();
3401 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3402 &iter.iter, sout, node.node) {
d07ceecd
MD		 3403 int64_t nb_packets_per_stream;
3404
e1986656
DG		 3405 /*
3406 * Make a local copy of the output and assign the possible
3407 * temporary value given by the caller.
3408 */
3409 memset(&tmp_output, 0, sizeof(tmp_output));
3410 memcpy(&tmp_output, sout, sizeof(tmp_output));
3411
e1986656
DG		 3412 if (output->max_size != (uint64_t) -1ULL) {
3413 tmp_output.max_size = output->max_size;
3414 }
3415
d07ceecd
MD		 3416 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3417 tmp_output.max_size);
3418 if (nb_packets_per_stream < 0) {
68808f4e
DG		 3419 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3420 goto error;
3421 }
3422
e1986656
DG		 3423 /* Use temporary name. */
3424 if (*output->name != '\0') {
3425 strncpy(tmp_output.name, output->name,
3426 sizeof(tmp_output.name));
3427 }
3428
1bfe7328
DG		 3429 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3430
e1986656 3431 ret = record_kernel_snapshot(ksess, &tmp_output,
d07ceecd 3432 session, wait, nb_packets_per_stream);
a934f4af 3433 if (ret != LTTNG_OK) {
6dc3064a
DG		 3434 rcu_read_unlock();
3435 goto error;
3436 }
1bfe7328 3437 snapshot_success = 1;
6dc3064a
DG		 3438 }
3439 rcu_read_unlock();
3440 }
3441 }
3442
3443 if (session->ust_session) {
3444 struct ltt_ust_session *usess = session->ust_session;
3445
e1986656 3446 if (use_tmp_output) {
d07ceecd
MD		 3447 int64_t nb_packets_per_stream;
3448
3449 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3450 tmp_output.max_size);
3451 if (nb_packets_per_stream < 0) {
3452 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3453 goto error;
3454 }
e1986656 3455 ret = record_ust_snapshot(usess, &tmp_output, session,
d07ceecd 3456 wait, nb_packets_per_stream);
a934f4af 3457 if (ret != LTTNG_OK) {
6dc3064a
DG		 3458 goto error;
3459 }
1bfe7328 3460 snapshot_success = 1;
6dc3064a
DG		 3461 } else {
3462 struct snapshot_output *sout;
3463 struct lttng_ht_iter iter;
3464
3465 rcu_read_lock();
3466 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3467 &iter.iter, sout, node.node) {
d07ceecd
MD		 3468 int64_t nb_packets_per_stream;
3469
e1986656
DG		 3470 /*
3471 * Make a local copy of the output and assign the possible
3472 * temporary value given by the caller.
3473 */
3474 memset(&tmp_output, 0, sizeof(tmp_output));
3475 memcpy(&tmp_output, sout, sizeof(tmp_output));
3476
e1986656
DG		 3477 if (output->max_size != (uint64_t) -1ULL) {
3478 tmp_output.max_size = output->max_size;
3479 }
3480
d07ceecd
MD		 3481 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3482 tmp_output.max_size);
3483 if (nb_packets_per_stream < 0) {
68808f4e 3484 ret = LTTNG_ERR_MAX_SIZE_INVALID;
d07ceecd 3485 rcu_read_unlock();
68808f4e
DG		 3486 goto error;
3487 }
3488
e1986656
DG		 3489 /* Use temporary name. */
3490 if (*output->name != '\0') {
3491 strncpy(tmp_output.name, output->name,
3492 sizeof(tmp_output.name));
3493 }
3494
1bfe7328
DG		 3495 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3496
e1986656 3497 ret = record_ust_snapshot(usess, &tmp_output, session,
d07ceecd 3498 wait, nb_packets_per_stream);
a934f4af 3499 if (ret != LTTNG_OK) {
6dc3064a
DG		 3500 rcu_read_unlock();
3501 goto error;
3502 }
1bfe7328 3503 snapshot_success = 1;
6dc3064a
DG		 3504 }
3505 rcu_read_unlock();
3506 }
3507 }
3508
1bfe7328
DG		 3509 if (snapshot_success) {
3510 session->snapshot.nb_snapshot++;
b67578cb
MD		 3511 } else {
3512 ret = LTTNG_ERR_SNAPSHOT_FAIL;
1bfe7328
DG		 3513 }
3514
6dc3064a 3515error:
6dc3064a
DG		 3516 return ret;
3517}
3518
d7ba1388
MD		 3519/*
3520 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
3521 */
3522int cmd_set_session_shm_path(struct ltt_session *session,
3523 const char *shm_path)
3524{
3525 /* Safety net */
3526 assert(session);
3527
3528 /*
3529 * Can only set shm path before session is started.
3530 */
3531 if (session->has_been_started) {
3532 return LTTNG_ERR_SESSION_STARTED;
3533 }
3534
3535 strncpy(session->shm_path, shm_path,
3536 sizeof(session->shm_path));
3537 session->shm_path[sizeof(session->shm_path) - 1] = '\0';
3538
3539 return 0;
3540}
3541
2f77fc4b
DG		 3542/*
3543 * Init command subsystem.
3544 */
3545void cmd_init(void)
3546{
3547 /*
d88aee68
DG		 3548 * Set network sequence index to 1 for streams to match a relayd
3549 * socket on the consumer side.
2f77fc4b 3550 */
d88aee68
DG		 3551 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3552 relayd_net_seq_idx = 1;
3553 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG		 3554
3555 DBG("Command subsystem initialized");
3556}
LTTng 2.0 tools and control repository
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