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