Commit | Line | Data |
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2f77fc4b DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
2f77fc4b DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License, version 2 only, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
16 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
2f77fc4b | 20 | #include <assert.h> |
6dc3064a | 21 | #include <inttypes.h> |
2f77fc4b DG |
22 | #include <urcu/list.h> |
23 | #include <urcu/uatomic.h> | |
24 | ||
25 | #include <common/defaults.h> | |
26 | #include <common/common.h> | |
27 | #include <common/sessiond-comm/sessiond-comm.h> | |
28 | #include <common/relayd/relayd.h> | |
10a50311 | 29 | #include <common/utils.h> |
f5436bfc | 30 | #include <common/compat/string.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" |
7c1d2758 | 41 | #include "agent.h" |
2f77fc4b DG |
42 | |
43 | #include "cmd.h" | |
44 | ||
45 | /* | |
46 | * Used to keep a unique index for each relayd socket created where this value | |
47 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
48 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
49 | * held. | |
2f77fc4b | 50 | */ |
d88aee68 DG |
51 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
52 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 53 | |
7076b56e JG |
54 | static int validate_event_name(const char *); |
55 | static int validate_ust_event_name(const char *); | |
56 | static int cmd_enable_event_internal(struct ltt_session *session, | |
57 | struct lttng_domain *domain, | |
58 | char *channel_name, struct lttng_event *event, | |
59 | char *filter_expression, | |
60 | struct lttng_filter_bytecode *filter, | |
61 | struct lttng_event_exclusion *exclusion, | |
62 | int wpipe); | |
63 | ||
2f77fc4b DG |
64 | /* |
65 | * Create a session path used by list_lttng_sessions for the case that the | |
66 | * session consumer is on the network. | |
67 | */ | |
68 | static int build_network_session_path(char *dst, size_t size, | |
69 | struct ltt_session *session) | |
70 | { | |
71 | int ret, kdata_port, udata_port; | |
72 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
73 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
74 | ||
75 | assert(session); | |
76 | assert(dst); | |
77 | ||
78 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
79 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
80 | ||
81 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
82 | ||
83 | if (session->kernel_session && session->kernel_session->consumer) { | |
84 | kuri = &session->kernel_session->consumer->dst.net.control; | |
85 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
86 | } | |
87 | ||
88 | if (session->ust_session && session->ust_session->consumer) { | |
89 | uuri = &session->ust_session->consumer->dst.net.control; | |
90 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
91 | } | |
92 | ||
93 | if (uuri == NULL && kuri == NULL) { | |
94 | uri = &session->consumer->dst.net.control; | |
95 | kdata_port = session->consumer->dst.net.data.port; | |
96 | } else if (kuri && uuri) { | |
97 | ret = uri_compare(kuri, uuri); | |
98 | if (ret) { | |
99 | /* Not Equal */ | |
100 | uri = kuri; | |
101 | /* Build uuri URL string */ | |
102 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
103 | if (ret < 0) { | |
104 | goto error; | |
105 | } | |
106 | } else { | |
107 | uri = kuri; | |
108 | } | |
109 | } else if (kuri && uuri == NULL) { | |
110 | uri = kuri; | |
111 | } else if (uuri && kuri == NULL) { | |
112 | uri = uuri; | |
113 | } | |
114 | ||
115 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
116 | if (ret < 0) { | |
117 | goto error; | |
118 | } | |
119 | ||
9aa9f900 DG |
120 | /* |
121 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
122 | * to print. | |
123 | */ | |
9d035200 | 124 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
125 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
126 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
127 | } else { | |
9aa9f900 | 128 | int dport; |
bef08707 | 129 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
130 | dport = kdata_port; |
131 | } else { | |
132 | /* No kernel URI, use the UST port. */ | |
133 | dport = udata_port; | |
134 | } | |
135 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
136 | } |
137 | ||
138 | error: | |
139 | return ret; | |
140 | } | |
141 | ||
142 | /* | |
143 | * Fill lttng_channel array of all channels. | |
144 | */ | |
56a37563 JG |
145 | static void list_lttng_channels(enum lttng_domain_type domain, |
146 | struct ltt_session *session, struct lttng_channel *channels) | |
2f77fc4b DG |
147 | { |
148 | int i = 0; | |
149 | struct ltt_kernel_channel *kchan; | |
150 | ||
151 | DBG("Listing channels for session %s", session->name); | |
152 | ||
153 | switch (domain) { | |
154 | case LTTNG_DOMAIN_KERNEL: | |
155 | /* Kernel channels */ | |
156 | if (session->kernel_session != NULL) { | |
157 | cds_list_for_each_entry(kchan, | |
158 | &session->kernel_session->channel_list.head, list) { | |
159 | /* Copy lttng_channel struct to array */ | |
160 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
161 | channels[i].enabled = kchan->enabled; | |
162 | i++; | |
163 | } | |
164 | } | |
165 | break; | |
166 | case LTTNG_DOMAIN_UST: | |
167 | { | |
168 | struct lttng_ht_iter iter; | |
169 | struct ltt_ust_channel *uchan; | |
170 | ||
e7fe706f | 171 | rcu_read_lock(); |
2f77fc4b DG |
172 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
173 | &iter.iter, uchan, node.node) { | |
174 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
175 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
176 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
177 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
178 | channels[i].attr.switch_timer_interval = | |
179 | uchan->attr.switch_timer_interval; | |
180 | channels[i].attr.read_timer_interval = | |
181 | uchan->attr.read_timer_interval; | |
182 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
183 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
184 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
2f77fc4b DG |
185 | switch (uchan->attr.output) { |
186 | case LTTNG_UST_MMAP: | |
187 | default: | |
188 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
189 | break; | |
190 | } | |
191 | i++; | |
192 | } | |
e7fe706f | 193 | rcu_read_unlock(); |
2f77fc4b DG |
194 | break; |
195 | } | |
196 | default: | |
197 | break; | |
198 | } | |
199 | } | |
200 | ||
3c6a091f | 201 | /* |
022d91ba | 202 | * Create a list of agent domain events. |
3c6a091f DG |
203 | * |
204 | * Return number of events in list on success or else a negative value. | |
205 | */ | |
022d91ba | 206 | static int list_lttng_agent_events(struct agent *agt, |
3c6a091f DG |
207 | struct lttng_event **events) |
208 | { | |
209 | int i = 0, ret = 0; | |
210 | unsigned int nb_event = 0; | |
022d91ba | 211 | struct agent_event *event; |
3c6a091f DG |
212 | struct lttng_event *tmp_events; |
213 | struct lttng_ht_iter iter; | |
214 | ||
022d91ba | 215 | assert(agt); |
3c6a091f DG |
216 | assert(events); |
217 | ||
022d91ba | 218 | DBG3("Listing agent events"); |
3c6a091f | 219 | |
e5bbf678 | 220 | rcu_read_lock(); |
022d91ba | 221 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 222 | rcu_read_unlock(); |
3c6a091f DG |
223 | if (nb_event == 0) { |
224 | ret = nb_event; | |
225 | goto error; | |
226 | } | |
227 | ||
228 | tmp_events = zmalloc(nb_event * sizeof(*tmp_events)); | |
229 | if (!tmp_events) { | |
022d91ba | 230 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
231 | ret = -LTTNG_ERR_FATAL; |
232 | goto error; | |
233 | } | |
234 | ||
235 | rcu_read_lock(); | |
022d91ba | 236 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
237 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
238 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
239 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 240 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 241 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f DG |
242 | i++; |
243 | } | |
244 | rcu_read_unlock(); | |
245 | ||
246 | *events = tmp_events; | |
247 | ret = nb_event; | |
248 | ||
249 | error: | |
250 | assert(nb_event == i); | |
251 | return ret; | |
252 | } | |
253 | ||
2f77fc4b DG |
254 | /* |
255 | * Create a list of ust global domain events. | |
256 | */ | |
257 | static int list_lttng_ust_global_events(char *channel_name, | |
258 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
259 | { | |
260 | int i = 0, ret = 0; | |
261 | unsigned int nb_event = 0; | |
262 | struct lttng_ht_iter iter; | |
263 | struct lttng_ht_node_str *node; | |
264 | struct ltt_ust_channel *uchan; | |
265 | struct ltt_ust_event *uevent; | |
266 | struct lttng_event *tmp; | |
267 | ||
268 | DBG("Listing UST global events for channel %s", channel_name); | |
269 | ||
270 | rcu_read_lock(); | |
271 | ||
272 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
273 | node = lttng_ht_iter_get_node_str(&iter); | |
274 | if (node == NULL) { | |
f73fabfd | 275 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
276 | goto error; |
277 | } | |
278 | ||
279 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
280 | ||
3c442be3 | 281 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
282 | if (nb_event == 0) { |
283 | ret = nb_event; | |
284 | goto error; | |
285 | } | |
286 | ||
287 | DBG3("Listing UST global %d events", nb_event); | |
288 | ||
289 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
290 | if (tmp == NULL) { | |
f73fabfd | 291 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
292 | goto error; |
293 | } | |
294 | ||
295 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
3c442be3 JG |
296 | if (uevent->internal) { |
297 | /* This event should remain hidden from clients */ | |
298 | nb_event--; | |
299 | continue; | |
300 | } | |
2f77fc4b DG |
301 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
302 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
303 | tmp[i].enabled = uevent->enabled; | |
304 | ||
305 | switch (uevent->attr.instrumentation) { | |
306 | case LTTNG_UST_TRACEPOINT: | |
307 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
308 | break; | |
309 | case LTTNG_UST_PROBE: | |
310 | tmp[i].type = LTTNG_EVENT_PROBE; | |
311 | break; | |
312 | case LTTNG_UST_FUNCTION: | |
313 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
314 | break; | |
315 | } | |
316 | ||
317 | tmp[i].loglevel = uevent->attr.loglevel; | |
318 | switch (uevent->attr.loglevel_type) { | |
319 | case LTTNG_UST_LOGLEVEL_ALL: | |
320 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
321 | break; | |
322 | case LTTNG_UST_LOGLEVEL_RANGE: | |
323 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
324 | break; | |
325 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
326 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
327 | break; | |
328 | } | |
329 | if (uevent->filter) { | |
330 | tmp[i].filter = 1; | |
331 | } | |
4634f12e JI |
332 | if (uevent->exclusion) { |
333 | tmp[i].exclusion = 1; | |
334 | } | |
2f77fc4b DG |
335 | i++; |
336 | } | |
337 | ||
338 | ret = nb_event; | |
339 | *events = tmp; | |
340 | ||
341 | error: | |
342 | rcu_read_unlock(); | |
343 | return ret; | |
344 | } | |
345 | ||
346 | /* | |
347 | * Fill lttng_event array of all kernel events in the channel. | |
348 | */ | |
349 | static int list_lttng_kernel_events(char *channel_name, | |
350 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
351 | { | |
352 | int i = 0, ret; | |
353 | unsigned int nb_event; | |
354 | struct ltt_kernel_event *event; | |
355 | struct ltt_kernel_channel *kchan; | |
356 | ||
357 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
358 | if (kchan == NULL) { | |
f73fabfd | 359 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
360 | goto error; |
361 | } | |
362 | ||
363 | nb_event = kchan->event_count; | |
364 | ||
365 | DBG("Listing events for channel %s", kchan->channel->name); | |
366 | ||
367 | if (nb_event == 0) { | |
834978fd DG |
368 | *events = NULL; |
369 | goto syscall; | |
2f77fc4b DG |
370 | } |
371 | ||
372 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
373 | if (*events == NULL) { | |
f73fabfd | 374 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
375 | goto error; |
376 | } | |
377 | ||
378 | /* Kernel channels */ | |
379 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
380 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
381 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
382 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
383 | (*events)[i].filter = |
384 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
385 | |
386 | switch (event->event->instrumentation) { | |
387 | case LTTNG_KERNEL_TRACEPOINT: | |
388 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
389 | break; | |
2f77fc4b | 390 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
391 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
392 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
393 | sizeof(struct lttng_kernel_kprobe)); | |
394 | break; | |
395 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
396 | (*events)[i].type = LTTNG_EVENT_PROBE; |
397 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
398 | sizeof(struct lttng_kernel_kprobe)); | |
399 | break; | |
400 | case LTTNG_KERNEL_FUNCTION: | |
401 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
402 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
403 | sizeof(struct lttng_kernel_function)); | |
404 | break; | |
405 | case LTTNG_KERNEL_NOOP: | |
406 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
407 | break; | |
408 | case LTTNG_KERNEL_SYSCALL: | |
409 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
410 | break; | |
411 | case LTTNG_KERNEL_ALL: | |
412 | assert(0); | |
413 | break; | |
414 | } | |
415 | i++; | |
416 | } | |
417 | ||
834978fd DG |
418 | syscall: |
419 | if (syscall_table) { | |
420 | ssize_t new_size; | |
421 | ||
422 | new_size = syscall_list_channel(kchan, events, nb_event); | |
423 | if (new_size < 0) { | |
424 | free(events); | |
425 | ret = -new_size; | |
426 | goto error; | |
427 | } | |
428 | nb_event = new_size; | |
429 | } | |
430 | ||
2f77fc4b DG |
431 | return nb_event; |
432 | ||
433 | error: | |
f73fabfd DG |
434 | /* Negate the error code to differentiate the size from an error */ |
435 | return -ret; | |
2f77fc4b DG |
436 | } |
437 | ||
438 | /* | |
439 | * Add URI so the consumer output object. Set the correct path depending on the | |
440 | * domain adding the default trace directory. | |
441 | */ | |
442 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
56a37563 JG |
443 | struct lttng_uri *uri, enum lttng_domain_type domain, |
444 | const char *session_name) | |
2f77fc4b | 445 | { |
f73fabfd | 446 | int ret = LTTNG_OK; |
2f77fc4b DG |
447 | const char *default_trace_dir; |
448 | ||
449 | assert(uri); | |
450 | ||
451 | if (consumer == NULL) { | |
452 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 453 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
454 | goto error; |
455 | } | |
456 | ||
457 | switch (domain) { | |
458 | case LTTNG_DOMAIN_KERNEL: | |
459 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
460 | break; | |
461 | case LTTNG_DOMAIN_UST: | |
462 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
463 | break; | |
464 | default: | |
465 | /* | |
466 | * This case is possible is we try to add the URI to the global tracing | |
467 | * session consumer object which in this case there is no subdir. | |
468 | */ | |
469 | default_trace_dir = ""; | |
470 | } | |
471 | ||
472 | switch (uri->dtype) { | |
473 | case LTTNG_DST_IPV4: | |
474 | case LTTNG_DST_IPV6: | |
475 | DBG2("Setting network URI to consumer"); | |
476 | ||
df75acac DG |
477 | if (consumer->type == CONSUMER_DST_NET) { |
478 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
479 | consumer->dst.net.control_isset) || |
480 | (uri->stype == LTTNG_STREAM_DATA && | |
481 | consumer->dst.net.data_isset)) { | |
df75acac DG |
482 | ret = LTTNG_ERR_URL_EXIST; |
483 | goto error; | |
484 | } | |
485 | } else { | |
486 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
487 | } |
488 | ||
df75acac DG |
489 | consumer->type = CONSUMER_DST_NET; |
490 | ||
2f77fc4b DG |
491 | /* Set URI into consumer output object */ |
492 | ret = consumer_set_network_uri(consumer, uri); | |
493 | if (ret < 0) { | |
a74934ba | 494 | ret = -ret; |
2f77fc4b DG |
495 | goto error; |
496 | } else if (ret == 1) { | |
497 | /* | |
498 | * URI was the same in the consumer so we do not append the subdir | |
499 | * again so to not duplicate output dir. | |
500 | */ | |
f86c9f4e | 501 | ret = LTTNG_OK; |
2f77fc4b DG |
502 | goto error; |
503 | } | |
504 | ||
505 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
506 | ret = consumer_set_subdir(consumer, session_name); | |
507 | if (ret < 0) { | |
f73fabfd | 508 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
509 | goto error; |
510 | } | |
511 | } | |
512 | ||
513 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
514 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
515 | strncat(consumer->subdir, default_trace_dir, |
516 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
517 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
518 | } | |
519 | ||
520 | break; | |
521 | case LTTNG_DST_PATH: | |
522 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
523 | memset(consumer->dst.trace_path, 0, | |
524 | sizeof(consumer->dst.trace_path)); | |
525 | strncpy(consumer->dst.trace_path, uri->dst.path, | |
526 | sizeof(consumer->dst.trace_path)); | |
527 | /* Append default trace dir */ | |
528 | strncat(consumer->dst.trace_path, default_trace_dir, | |
c30ce0b3 CB |
529 | sizeof(consumer->dst.trace_path) - |
530 | strlen(consumer->dst.trace_path) - 1); | |
2f77fc4b DG |
531 | /* Flag consumer as local. */ |
532 | consumer->type = CONSUMER_DST_LOCAL; | |
533 | break; | |
534 | } | |
535 | ||
a74934ba DG |
536 | ret = LTTNG_OK; |
537 | ||
2f77fc4b DG |
538 | error: |
539 | return ret; | |
540 | } | |
541 | ||
542 | /* | |
543 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
544 | */ | |
545 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
546 | { | |
547 | int ret = 0; | |
548 | struct lttng_ht_iter iter; | |
549 | struct consumer_socket *socket; | |
550 | ||
551 | assert(session); | |
552 | ||
e7fe706f DG |
553 | rcu_read_lock(); |
554 | ||
2f77fc4b DG |
555 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
556 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
557 | socket, node.node) { | |
2f77fc4b | 558 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 559 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
560 | pthread_mutex_unlock(socket->lock); |
561 | if (ret < 0) { | |
f73fabfd | 562 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
563 | goto error; |
564 | } | |
565 | } | |
566 | } | |
567 | ||
568 | error: | |
e7fe706f | 569 | rcu_read_unlock(); |
2f77fc4b DG |
570 | return ret; |
571 | } | |
572 | ||
573 | /* | |
574 | * Create a socket to the relayd using the URI. | |
575 | * | |
576 | * On success, the relayd_sock pointer is set to the created socket. | |
577 | * Else, it's stays untouched and a lttcomm error code is returned. | |
578 | */ | |
6151a90f JD |
579 | static int create_connect_relayd(struct lttng_uri *uri, |
580 | struct lttcomm_relayd_sock **relayd_sock) | |
2f77fc4b DG |
581 | { |
582 | int ret; | |
6151a90f | 583 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 584 | |
6151a90f JD |
585 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
586 | RELAYD_VERSION_COMM_MINOR); | |
587 | if (!rsock) { | |
f73fabfd | 588 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
589 | goto error; |
590 | } | |
591 | ||
ffe60014 DG |
592 | /* |
593 | * Connect to relayd so we can proceed with a session creation. This call | |
594 | * can possibly block for an arbitrary amount of time to set the health | |
595 | * state to be in poll execution. | |
596 | */ | |
597 | health_poll_entry(); | |
6151a90f | 598 | ret = relayd_connect(rsock); |
ffe60014 | 599 | health_poll_exit(); |
2f77fc4b DG |
600 | if (ret < 0) { |
601 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 602 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
603 | goto free_sock; |
604 | } | |
605 | ||
606 | /* Create socket for control stream. */ | |
607 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
608 | DBG3("Creating relayd stream socket from URI"); | |
609 | ||
610 | /* Check relayd version */ | |
6151a90f | 611 | ret = relayd_version_check(rsock); |
2f77fc4b | 612 | if (ret < 0) { |
f73fabfd | 613 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
614 | goto close_sock; |
615 | } | |
616 | } else if (uri->stype == LTTNG_STREAM_DATA) { | |
617 | DBG3("Creating relayd data socket from URI"); | |
618 | } else { | |
619 | /* Command is not valid */ | |
620 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 621 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
622 | goto close_sock; |
623 | } | |
624 | ||
6151a90f | 625 | *relayd_sock = rsock; |
2f77fc4b | 626 | |
f73fabfd | 627 | return LTTNG_OK; |
2f77fc4b DG |
628 | |
629 | close_sock: | |
6151a90f JD |
630 | /* The returned value is not useful since we are on an error path. */ |
631 | (void) relayd_close(rsock); | |
2f77fc4b | 632 | free_sock: |
6151a90f | 633 | free(rsock); |
2f77fc4b DG |
634 | error: |
635 | return ret; | |
636 | } | |
637 | ||
638 | /* | |
639 | * Connect to the relayd using URI and send the socket to the right consumer. | |
640 | */ | |
56a37563 JG |
641 | static int send_consumer_relayd_socket(enum lttng_domain_type domain, |
642 | unsigned int session_id, struct lttng_uri *relayd_uri, | |
643 | struct consumer_output *consumer, | |
d3e2ba59 JD |
644 | struct consumer_socket *consumer_sock, |
645 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
646 | { |
647 | int ret; | |
6151a90f | 648 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 649 | |
ffe60014 | 650 | /* Connect to relayd and make version check if uri is the control. */ |
6151a90f | 651 | ret = create_connect_relayd(relayd_uri, &rsock); |
ffe60014 | 652 | if (ret != LTTNG_OK) { |
6151a90f | 653 | goto error; |
ffe60014 | 654 | } |
6151a90f | 655 | assert(rsock); |
ffe60014 | 656 | |
2f77fc4b | 657 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
658 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
659 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
660 | /* |
661 | * Increment net_seq_idx because we are about to transfer the | |
662 | * new relayd socket to the consumer. | |
d88aee68 | 663 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 664 | */ |
d88aee68 DG |
665 | consumer->net_seq_index = ++relayd_net_seq_idx; |
666 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
667 | } |
668 | ||
2f77fc4b | 669 | /* Send relayd socket to consumer. */ |
6151a90f | 670 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
671 | relayd_uri->stype, session_id, |
672 | session_name, hostname, session_live_timer); | |
2f77fc4b | 673 | if (ret < 0) { |
f73fabfd | 674 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
675 | goto close_sock; |
676 | } | |
677 | ||
c890b720 DG |
678 | /* Flag that the corresponding socket was sent. */ |
679 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 680 | consumer_sock->control_sock_sent = 1; |
c890b720 | 681 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 682 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
683 | } |
684 | ||
f73fabfd | 685 | ret = LTTNG_OK; |
2f77fc4b DG |
686 | |
687 | /* | |
688 | * Close socket which was dup on the consumer side. The session daemon does | |
689 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
690 | */ | |
691 | ||
692 | close_sock: | |
6151a90f JD |
693 | (void) relayd_close(rsock); |
694 | free(rsock); | |
2f77fc4b | 695 | |
6151a90f | 696 | error: |
ffe60014 DG |
697 | if (ret != LTTNG_OK) { |
698 | /* | |
d9078d0c DG |
699 | * The consumer output for this session should not be used anymore |
700 | * since the relayd connection failed thus making any tracing or/and | |
701 | * streaming not usable. | |
ffe60014 | 702 | */ |
d9078d0c | 703 | consumer->enabled = 0; |
ffe60014 | 704 | } |
2f77fc4b DG |
705 | return ret; |
706 | } | |
707 | ||
708 | /* | |
709 | * Send both relayd sockets to a specific consumer and domain. This is a | |
710 | * helper function to facilitate sending the information to the consumer for a | |
711 | * session. | |
712 | */ | |
56a37563 JG |
713 | static int send_consumer_relayd_sockets(enum lttng_domain_type domain, |
714 | unsigned int session_id, struct consumer_output *consumer, | |
715 | struct consumer_socket *sock, char *session_name, | |
716 | char *hostname, int session_live_timer) | |
2f77fc4b | 717 | { |
dda67f6c | 718 | int ret = LTTNG_OK; |
2f77fc4b | 719 | |
2f77fc4b | 720 | assert(consumer); |
6dc3064a | 721 | assert(sock); |
2f77fc4b | 722 | |
2f77fc4b | 723 | /* Sending control relayd socket. */ |
ffe60014 | 724 | if (!sock->control_sock_sent) { |
6dc3064a | 725 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
726 | &consumer->dst.net.control, consumer, sock, |
727 | session_name, hostname, session_live_timer); | |
c890b720 DG |
728 | if (ret != LTTNG_OK) { |
729 | goto error; | |
730 | } | |
2f77fc4b DG |
731 | } |
732 | ||
733 | /* Sending data relayd socket. */ | |
ffe60014 | 734 | if (!sock->data_sock_sent) { |
6dc3064a | 735 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
736 | &consumer->dst.net.data, consumer, sock, |
737 | session_name, hostname, session_live_timer); | |
c890b720 DG |
738 | if (ret != LTTNG_OK) { |
739 | goto error; | |
740 | } | |
2f77fc4b DG |
741 | } |
742 | ||
2f77fc4b DG |
743 | error: |
744 | return ret; | |
745 | } | |
746 | ||
747 | /* | |
748 | * Setup relayd connections for a tracing session. First creates the socket to | |
749 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
750 | * network. | |
751 | */ | |
ffe60014 | 752 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 753 | { |
f73fabfd | 754 | int ret = LTTNG_OK; |
2f77fc4b DG |
755 | struct ltt_ust_session *usess; |
756 | struct ltt_kernel_session *ksess; | |
757 | struct consumer_socket *socket; | |
758 | struct lttng_ht_iter iter; | |
759 | ||
760 | assert(session); | |
761 | ||
762 | usess = session->ust_session; | |
763 | ksess = session->kernel_session; | |
764 | ||
785d2d0d | 765 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 766 | |
e7fe706f DG |
767 | rcu_read_lock(); |
768 | ||
2f77fc4b DG |
769 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
770 | && usess->consumer->enabled) { | |
771 | /* For each consumer socket, send relayd sockets */ | |
772 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
773 | socket, node.node) { | |
2f77fc4b | 774 | pthread_mutex_lock(socket->lock); |
6dc3064a | 775 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
776 | usess->consumer, socket, |
777 | session->name, session->hostname, | |
778 | session->live_timer); | |
2f77fc4b | 779 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 780 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
781 | goto error; |
782 | } | |
6dc3064a DG |
783 | /* Session is now ready for network streaming. */ |
784 | session->net_handle = 1; | |
2f77fc4b DG |
785 | } |
786 | } | |
787 | ||
788 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
789 | && ksess->consumer->enabled) { | |
790 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
791 | socket, node.node) { | |
2f77fc4b | 792 | pthread_mutex_lock(socket->lock); |
6dc3064a | 793 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
794 | ksess->consumer, socket, |
795 | session->name, session->hostname, | |
796 | session->live_timer); | |
2f77fc4b | 797 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 798 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
799 | goto error; |
800 | } | |
6dc3064a DG |
801 | /* Session is now ready for network streaming. */ |
802 | session->net_handle = 1; | |
2f77fc4b DG |
803 | } |
804 | } | |
805 | ||
806 | error: | |
e7fe706f | 807 | rcu_read_unlock(); |
2f77fc4b DG |
808 | return ret; |
809 | } | |
810 | ||
9b6c7ec5 DG |
811 | /* |
812 | * Start a kernel session by opening all necessary streams. | |
813 | */ | |
814 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
815 | { | |
816 | int ret; | |
817 | struct ltt_kernel_channel *kchan; | |
818 | ||
819 | /* Open kernel metadata */ | |
07b86b52 | 820 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
821 | ret = kernel_open_metadata(ksess); |
822 | if (ret < 0) { | |
823 | ret = LTTNG_ERR_KERN_META_FAIL; | |
824 | goto error; | |
825 | } | |
826 | } | |
827 | ||
828 | /* Open kernel metadata stream */ | |
07b86b52 | 829 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
830 | ret = kernel_open_metadata_stream(ksess); |
831 | if (ret < 0) { | |
832 | ERR("Kernel create metadata stream failed"); | |
833 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
834 | goto error; | |
835 | } | |
836 | } | |
837 | ||
838 | /* For each channel */ | |
839 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
840 | if (kchan->stream_count == 0) { | |
841 | ret = kernel_open_channel_stream(kchan); | |
842 | if (ret < 0) { | |
843 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
844 | goto error; | |
845 | } | |
846 | /* Update the stream global counter */ | |
847 | ksess->stream_count_global += ret; | |
848 | } | |
849 | } | |
850 | ||
851 | /* Setup kernel consumer socket and send fds to it */ | |
852 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 853 | if (ret != 0) { |
9b6c7ec5 DG |
854 | ret = LTTNG_ERR_KERN_START_FAIL; |
855 | goto error; | |
856 | } | |
857 | ||
858 | /* This start the kernel tracing */ | |
859 | ret = kernel_start_session(ksess); | |
860 | if (ret < 0) { | |
861 | ret = LTTNG_ERR_KERN_START_FAIL; | |
862 | goto error; | |
863 | } | |
864 | ||
865 | /* Quiescent wait after starting trace */ | |
784303b0 | 866 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 | 867 | |
14fb1ebe | 868 | ksess->active = 1; |
9b6c7ec5 DG |
869 | |
870 | ret = LTTNG_OK; | |
871 | ||
872 | error: | |
873 | return ret; | |
874 | } | |
875 | ||
2f77fc4b DG |
876 | /* |
877 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
878 | */ | |
56a37563 JG |
879 | int cmd_disable_channel(struct ltt_session *session, |
880 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
881 | { |
882 | int ret; | |
883 | struct ltt_ust_session *usess; | |
884 | ||
885 | usess = session->ust_session; | |
886 | ||
2223c96f DG |
887 | rcu_read_lock(); |
888 | ||
2f77fc4b DG |
889 | switch (domain) { |
890 | case LTTNG_DOMAIN_KERNEL: | |
891 | { | |
892 | ret = channel_kernel_disable(session->kernel_session, | |
893 | channel_name); | |
f73fabfd | 894 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
895 | goto error; |
896 | } | |
897 | ||
898 | kernel_wait_quiescent(kernel_tracer_fd); | |
899 | break; | |
900 | } | |
901 | case LTTNG_DOMAIN_UST: | |
902 | { | |
903 | struct ltt_ust_channel *uchan; | |
904 | struct lttng_ht *chan_ht; | |
905 | ||
906 | chan_ht = usess->domain_global.channels; | |
907 | ||
908 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
909 | if (uchan == NULL) { | |
f73fabfd | 910 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
911 | goto error; |
912 | } | |
913 | ||
7972aab2 | 914 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 915 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
916 | goto error; |
917 | } | |
918 | break; | |
919 | } | |
2f77fc4b | 920 | default: |
f73fabfd | 921 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
922 | goto error; |
923 | } | |
924 | ||
f73fabfd | 925 | ret = LTTNG_OK; |
2f77fc4b DG |
926 | |
927 | error: | |
2223c96f | 928 | rcu_read_unlock(); |
2f77fc4b DG |
929 | return ret; |
930 | } | |
931 | ||
ccf10263 MD |
932 | /* |
933 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
934 | * |
935 | * Called with session lock held. | |
ccf10263 | 936 | */ |
56a37563 JG |
937 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
938 | int pid) | |
ccf10263 MD |
939 | { |
940 | int ret; | |
941 | ||
942 | rcu_read_lock(); | |
943 | ||
944 | switch (domain) { | |
945 | case LTTNG_DOMAIN_KERNEL: | |
946 | { | |
947 | struct ltt_kernel_session *ksess; | |
948 | ||
949 | ksess = session->kernel_session; | |
950 | ||
951 | ret = kernel_track_pid(ksess, pid); | |
952 | if (ret != LTTNG_OK) { | |
953 | goto error; | |
954 | } | |
955 | ||
956 | kernel_wait_quiescent(kernel_tracer_fd); | |
957 | break; | |
958 | } | |
ccf10263 | 959 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
960 | { |
961 | struct ltt_ust_session *usess; | |
962 | ||
963 | usess = session->ust_session; | |
964 | ||
965 | ret = trace_ust_track_pid(usess, pid); | |
966 | if (ret != LTTNG_OK) { | |
967 | goto error; | |
968 | } | |
969 | break; | |
970 | } | |
ccf10263 MD |
971 | default: |
972 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
973 | goto error; | |
974 | } | |
975 | ||
976 | ret = LTTNG_OK; | |
977 | ||
978 | error: | |
979 | rcu_read_unlock(); | |
980 | return ret; | |
981 | } | |
982 | ||
983 | /* | |
984 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
985 | * |
986 | * Called with session lock held. | |
ccf10263 | 987 | */ |
56a37563 JG |
988 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
989 | int pid) | |
ccf10263 MD |
990 | { |
991 | int ret; | |
992 | ||
993 | rcu_read_lock(); | |
994 | ||
995 | switch (domain) { | |
996 | case LTTNG_DOMAIN_KERNEL: | |
997 | { | |
998 | struct ltt_kernel_session *ksess; | |
999 | ||
1000 | ksess = session->kernel_session; | |
1001 | ||
1002 | ret = kernel_untrack_pid(ksess, pid); | |
1003 | if (ret != LTTNG_OK) { | |
1004 | goto error; | |
1005 | } | |
1006 | ||
1007 | kernel_wait_quiescent(kernel_tracer_fd); | |
1008 | break; | |
1009 | } | |
ccf10263 | 1010 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1011 | { |
1012 | struct ltt_ust_session *usess; | |
1013 | ||
1014 | usess = session->ust_session; | |
1015 | ||
1016 | ret = trace_ust_untrack_pid(usess, pid); | |
1017 | if (ret != LTTNG_OK) { | |
1018 | goto error; | |
1019 | } | |
1020 | break; | |
1021 | } | |
ccf10263 MD |
1022 | default: |
1023 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1024 | goto error; | |
1025 | } | |
1026 | ||
1027 | ret = LTTNG_OK; | |
1028 | ||
1029 | error: | |
1030 | rcu_read_unlock(); | |
1031 | return ret; | |
1032 | } | |
1033 | ||
2f77fc4b DG |
1034 | /* |
1035 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1036 | * | |
1037 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1038 | */ | |
1039 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1040 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1041 | { |
1042 | int ret; | |
1043 | struct ltt_ust_session *usess = session->ust_session; | |
1044 | struct lttng_ht *chan_ht; | |
1f345e94 | 1045 | size_t len; |
2f77fc4b DG |
1046 | |
1047 | assert(session); | |
1048 | assert(attr); | |
7972aab2 | 1049 | assert(domain); |
2f77fc4b | 1050 | |
f5436bfc | 1051 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1052 | |
1053 | /* Validate channel name */ | |
1054 | if (attr->name[0] == '.' || | |
1055 | memchr(attr->name, '/', len) != NULL) { | |
1056 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1057 | goto end; | |
1058 | } | |
1059 | ||
2f77fc4b DG |
1060 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1061 | ||
03b4fdcf DG |
1062 | rcu_read_lock(); |
1063 | ||
ecc48a90 JD |
1064 | /* |
1065 | * Don't try to enable a channel if the session has been started at | |
1066 | * some point in time before. The tracer does not allow it. | |
1067 | */ | |
8382cf6f | 1068 | if (session->has_been_started) { |
ecc48a90 JD |
1069 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1070 | goto error; | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * If the session is a live session, remove the switch timer, the | |
1075 | * live timer does the same thing but sends also synchronisation | |
1076 | * beacons for inactive streams. | |
1077 | */ | |
1078 | if (session->live_timer > 0) { | |
1079 | attr->attr.live_timer_interval = session->live_timer; | |
1080 | attr->attr.switch_timer_interval = 0; | |
1081 | } | |
1082 | ||
33fbd469 DG |
1083 | /* |
1084 | * The ringbuffer (both in user space and kernel) behave badly in overwrite | |
1085 | * mode and with less than 2 subbuf so block it right away and send back an | |
1086 | * invalid attribute error. | |
1087 | */ | |
1088 | if (attr->attr.overwrite && attr->attr.num_subbuf < 2) { | |
1089 | ret = LTTNG_ERR_INVALID; | |
1090 | goto error; | |
1091 | } | |
1092 | ||
7972aab2 | 1093 | switch (domain->type) { |
2f77fc4b DG |
1094 | case LTTNG_DOMAIN_KERNEL: |
1095 | { | |
1096 | struct ltt_kernel_channel *kchan; | |
1097 | ||
2f77fc4b DG |
1098 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1099 | session->kernel_session); | |
1100 | if (kchan == NULL) { | |
1101 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1102 | if (attr->name[0] != '\0') { |
1103 | session->kernel_session->has_non_default_channel = 1; | |
1104 | } | |
2f77fc4b DG |
1105 | } else { |
1106 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1107 | } | |
1108 | ||
f73fabfd | 1109 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1110 | goto error; |
1111 | } | |
1112 | ||
784303b0 | 1113 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1114 | break; |
1115 | } | |
1116 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1117 | case LTTNG_DOMAIN_JUL: |
1118 | case LTTNG_DOMAIN_LOG4J: | |
1119 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1120 | { |
1121 | struct ltt_ust_channel *uchan; | |
1122 | ||
9232818f JG |
1123 | /* |
1124 | * FIXME | |
1125 | * | |
1126 | * Current agent implementation limitations force us to allow | |
1127 | * only one channel at once in "agent" subdomains. Each | |
1128 | * subdomain has a default channel name which must be strictly | |
1129 | * adhered to. | |
1130 | */ | |
1131 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1132 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1133 | LTTNG_SYMBOL_NAME_LEN)) { | |
1134 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1135 | goto error; | |
1136 | } | |
1137 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1138 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1139 | LTTNG_SYMBOL_NAME_LEN)) { | |
1140 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1141 | goto error; | |
1142 | } | |
1143 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1144 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1145 | LTTNG_SYMBOL_NAME_LEN)) { | |
1146 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1147 | goto error; | |
1148 | } | |
1149 | } | |
1150 | ||
2f77fc4b DG |
1151 | chan_ht = usess->domain_global.channels; |
1152 | ||
1153 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1154 | if (uchan == NULL) { | |
7972aab2 | 1155 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1156 | if (attr->name[0] != '\0') { |
1157 | usess->has_non_default_channel = 1; | |
1158 | } | |
2f77fc4b | 1159 | } else { |
7972aab2 | 1160 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1161 | } |
1162 | break; | |
1163 | } | |
2f77fc4b | 1164 | default: |
f73fabfd | 1165 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1166 | goto error; |
1167 | } | |
1168 | ||
1169 | error: | |
2223c96f | 1170 | rcu_read_unlock(); |
1f345e94 | 1171 | end: |
2f77fc4b DG |
1172 | return ret; |
1173 | } | |
1174 | ||
2f77fc4b DG |
1175 | /* |
1176 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1177 | */ | |
56a37563 JG |
1178 | int cmd_disable_event(struct ltt_session *session, |
1179 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1180 | struct lttng_event *event) |
2f77fc4b DG |
1181 | { |
1182 | int ret; | |
6e911cad MD |
1183 | char *event_name; |
1184 | ||
18a720cd MD |
1185 | DBG("Disable event command for event \'%s\'", event->name); |
1186 | ||
6e911cad | 1187 | event_name = event->name; |
7076b56e JG |
1188 | if (validate_event_name(event_name)) { |
1189 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1190 | goto error; | |
1191 | } | |
6e911cad | 1192 | |
9b7431cf JG |
1193 | /* Error out on unhandled search criteria */ |
1194 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1195 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1196 | ret = LTTNG_ERR_UNK; |
1197 | goto error; | |
6e911cad | 1198 | } |
2f77fc4b | 1199 | |
2223c96f DG |
1200 | rcu_read_lock(); |
1201 | ||
2f77fc4b DG |
1202 | switch (domain) { |
1203 | case LTTNG_DOMAIN_KERNEL: | |
1204 | { | |
1205 | struct ltt_kernel_channel *kchan; | |
1206 | struct ltt_kernel_session *ksess; | |
1207 | ||
1208 | ksess = session->kernel_session; | |
1209 | ||
85076754 MD |
1210 | /* |
1211 | * If a non-default channel has been created in the | |
1212 | * session, explicitely require that -c chan_name needs | |
1213 | * to be provided. | |
1214 | */ | |
1215 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1216 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1217 | goto error_unlock; |
85076754 MD |
1218 | } |
1219 | ||
2f77fc4b DG |
1220 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1221 | if (kchan == NULL) { | |
f73fabfd | 1222 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1223 | goto error_unlock; |
2f77fc4b DG |
1224 | } |
1225 | ||
6e911cad MD |
1226 | switch (event->type) { |
1227 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1228 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1229 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1230 | case LTTNG_EVENT_PROBE: |
1231 | case LTTNG_EVENT_FUNCTION: | |
1232 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1233 | if (event_name[0] == '\0') { | |
1234 | ret = event_kernel_disable_event(kchan, | |
1235 | NULL, event->type); | |
29c62722 | 1236 | } else { |
d0ae4ea8 | 1237 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1238 | event_name, event->type); |
29c62722 | 1239 | } |
6e911cad | 1240 | if (ret != LTTNG_OK) { |
7076b56e | 1241 | goto error_unlock; |
6e911cad MD |
1242 | } |
1243 | break; | |
6e911cad MD |
1244 | default: |
1245 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1246 | goto error_unlock; |
2f77fc4b DG |
1247 | } |
1248 | ||
1249 | kernel_wait_quiescent(kernel_tracer_fd); | |
1250 | break; | |
1251 | } | |
1252 | case LTTNG_DOMAIN_UST: | |
1253 | { | |
1254 | struct ltt_ust_channel *uchan; | |
1255 | struct ltt_ust_session *usess; | |
1256 | ||
1257 | usess = session->ust_session; | |
1258 | ||
7076b56e JG |
1259 | if (validate_ust_event_name(event_name)) { |
1260 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1261 | goto error_unlock; | |
1262 | } | |
1263 | ||
85076754 MD |
1264 | /* |
1265 | * If a non-default channel has been created in the | |
9550ee81 | 1266 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1267 | * to be provided. |
1268 | */ | |
1269 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1270 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1271 | goto error_unlock; |
85076754 MD |
1272 | } |
1273 | ||
2f77fc4b DG |
1274 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1275 | channel_name); | |
1276 | if (uchan == NULL) { | |
f73fabfd | 1277 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1278 | goto error_unlock; |
2f77fc4b DG |
1279 | } |
1280 | ||
6e911cad MD |
1281 | switch (event->type) { |
1282 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1283 | /* |
1284 | * An empty event name means that everything | |
1285 | * should be disabled. | |
1286 | */ | |
1287 | if (event->name[0] == '\0') { | |
1288 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1289 | } else { |
1290 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1291 | event_name); | |
1292 | } | |
6e911cad | 1293 | if (ret != LTTNG_OK) { |
7076b56e | 1294 | goto error_unlock; |
6e911cad MD |
1295 | } |
1296 | break; | |
1297 | default: | |
1298 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1299 | goto error_unlock; |
2f77fc4b DG |
1300 | } |
1301 | ||
1302 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1303 | channel_name); | |
1304 | break; | |
1305 | } | |
5cdb6027 | 1306 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1307 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1308 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1309 | { |
fefd409b | 1310 | struct agent *agt; |
f20baf8e DG |
1311 | struct ltt_ust_session *usess = session->ust_session; |
1312 | ||
1313 | assert(usess); | |
1314 | ||
6e911cad MD |
1315 | switch (event->type) { |
1316 | case LTTNG_EVENT_ALL: | |
1317 | break; | |
1318 | default: | |
1319 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1320 | goto error_unlock; |
6e911cad MD |
1321 | } |
1322 | ||
5cdb6027 | 1323 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1324 | if (!agt) { |
1325 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1326 | goto error_unlock; |
fefd409b | 1327 | } |
b3639870 JR |
1328 | /* |
1329 | * An empty event name means that everything | |
1330 | * should be disabled. | |
1331 | */ | |
1332 | if (event->name[0] == '\0') { | |
18a720cd MD |
1333 | ret = event_agent_disable_all(usess, agt); |
1334 | } else { | |
1335 | ret = event_agent_disable(usess, agt, event_name); | |
1336 | } | |
f20baf8e | 1337 | if (ret != LTTNG_OK) { |
7076b56e | 1338 | goto error_unlock; |
f20baf8e DG |
1339 | } |
1340 | ||
1341 | break; | |
1342 | } | |
2f77fc4b | 1343 | default: |
f73fabfd | 1344 | ret = LTTNG_ERR_UND; |
7076b56e | 1345 | goto error_unlock; |
2f77fc4b DG |
1346 | } |
1347 | ||
f73fabfd | 1348 | ret = LTTNG_OK; |
2f77fc4b | 1349 | |
7076b56e | 1350 | error_unlock: |
2223c96f | 1351 | rcu_read_unlock(); |
7076b56e | 1352 | error: |
2f77fc4b DG |
1353 | return ret; |
1354 | } | |
1355 | ||
2f77fc4b DG |
1356 | /* |
1357 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1358 | */ | |
56a37563 | 1359 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1360 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1361 | { |
d5979e4a | 1362 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1363 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1364 | ||
1365 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1366 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1367 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1368 | } | |
2f77fc4b DG |
1369 | |
1370 | switch (domain) { | |
1371 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1372 | assert(session->kernel_session); |
1373 | ||
1374 | if (session->kernel_session->channel_count == 0) { | |
1375 | /* Create default channel */ | |
1376 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1377 | if (ret != LTTNG_OK) { | |
1378 | goto error; | |
1379 | } | |
d5979e4a | 1380 | chan_kern_created = 1; |
979e618e | 1381 | } |
2f77fc4b | 1382 | /* Add kernel context to kernel tracer */ |
601d5acf | 1383 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1384 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1385 | goto error; |
1386 | } | |
1387 | break; | |
bdf64013 JG |
1388 | case LTTNG_DOMAIN_JUL: |
1389 | case LTTNG_DOMAIN_LOG4J: | |
1390 | { | |
1391 | /* | |
1392 | * Validate channel name. | |
1393 | * If no channel name is given and the domain is JUL or LOG4J, | |
1394 | * set it to the appropriate domain-specific channel name. If | |
1395 | * a name is provided but does not match the expexted channel | |
1396 | * name, return an error. | |
1397 | */ | |
1398 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1399 | strcmp(channel_name, | |
1400 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1401 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1402 | goto error; | |
1403 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1404 | strcmp(channel_name, | |
1405 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1406 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1407 | goto error; | |
1408 | } | |
1409 | } | |
2f77fc4b DG |
1410 | case LTTNG_DOMAIN_UST: |
1411 | { | |
1412 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1413 | unsigned int chan_count; |
1414 | ||
2f77fc4b DG |
1415 | assert(usess); |
1416 | ||
85076754 | 1417 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1418 | if (chan_count == 0) { |
1419 | struct lttng_channel *attr; | |
1420 | /* Create default channel */ | |
0a9c6494 | 1421 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1422 | if (attr == NULL) { |
1423 | ret = LTTNG_ERR_FATAL; | |
1424 | goto error; | |
1425 | } | |
1426 | ||
7972aab2 | 1427 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1428 | if (ret != LTTNG_OK) { |
1429 | free(attr); | |
1430 | goto error; | |
1431 | } | |
1432 | free(attr); | |
d5979e4a | 1433 | chan_ust_created = 1; |
979e618e DG |
1434 | } |
1435 | ||
601d5acf | 1436 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1437 | free(app_ctx_provider_name); |
1438 | free(app_ctx_name); | |
1439 | app_ctx_name = NULL; | |
1440 | app_ctx_provider_name = NULL; | |
f73fabfd | 1441 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1442 | goto error; |
1443 | } | |
1444 | break; | |
1445 | } | |
2f77fc4b | 1446 | default: |
f73fabfd | 1447 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1448 | goto error; |
1449 | } | |
1450 | ||
bdf64013 JG |
1451 | ret = LTTNG_OK; |
1452 | goto end; | |
2f77fc4b DG |
1453 | |
1454 | error: | |
d5979e4a DG |
1455 | if (chan_kern_created) { |
1456 | struct ltt_kernel_channel *kchan = | |
1457 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1458 | session->kernel_session); | |
1459 | /* Created previously, this should NOT fail. */ | |
1460 | assert(kchan); | |
1461 | kernel_destroy_channel(kchan); | |
1462 | } | |
1463 | ||
1464 | if (chan_ust_created) { | |
1465 | struct ltt_ust_channel *uchan = | |
1466 | trace_ust_find_channel_by_name( | |
1467 | session->ust_session->domain_global.channels, | |
1468 | DEFAULT_CHANNEL_NAME); | |
1469 | /* Created previously, this should NOT fail. */ | |
1470 | assert(uchan); | |
1471 | /* Remove from the channel list of the session. */ | |
1472 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1473 | uchan); | |
1474 | trace_ust_destroy_channel(uchan); | |
1475 | } | |
bdf64013 JG |
1476 | end: |
1477 | free(app_ctx_provider_name); | |
1478 | free(app_ctx_name); | |
2f77fc4b DG |
1479 | return ret; |
1480 | } | |
1481 | ||
930a2e99 JG |
1482 | static int validate_event_name(const char *name) |
1483 | { | |
1484 | int ret = 0; | |
1485 | const char *c = name; | |
1486 | const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN; | |
bf9807db | 1487 | bool null_terminated = false; |
930a2e99 JG |
1488 | |
1489 | /* | |
1490 | * Make sure that unescaped wildcards are only used as the last | |
1491 | * character of the event name. | |
1492 | */ | |
1493 | while (c < event_name_end) { | |
1494 | switch (*c) { | |
1495 | case '\0': | |
bf9807db | 1496 | null_terminated = true; |
930a2e99 JG |
1497 | goto end; |
1498 | case '\\': | |
1499 | c++; | |
1500 | break; | |
1501 | case '*': | |
1502 | if ((c + 1) < event_name_end && *(c + 1)) { | |
1503 | /* Wildcard is not the last character */ | |
1504 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1505 | goto end; | |
1506 | } | |
1507 | default: | |
1508 | break; | |
1509 | } | |
1510 | c++; | |
1511 | } | |
1512 | end: | |
bf9807db JG |
1513 | if (!ret && !null_terminated) { |
1514 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1515 | } | |
930a2e99 JG |
1516 | return ret; |
1517 | } | |
1518 | ||
dac8e046 JG |
1519 | static inline bool name_starts_with(const char *name, const char *prefix) |
1520 | { | |
1521 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1522 | ||
1523 | return !strncmp(name, prefix, max_cmp_len); | |
1524 | } | |
1525 | ||
1526 | /* Perform userspace-specific event name validation */ | |
1527 | static int validate_ust_event_name(const char *name) | |
1528 | { | |
1529 | int ret = 0; | |
1530 | ||
1531 | if (!name) { | |
1532 | ret = -1; | |
1533 | goto end; | |
1534 | } | |
1535 | ||
1536 | /* | |
1537 | * Check name against all internal UST event component namespaces used | |
1538 | * by the agents. | |
1539 | */ | |
1540 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1541 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1542 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1543 | ret = -1; | |
1544 | } | |
1545 | ||
1546 | end: | |
1547 | return ret; | |
1548 | } | |
88f06f15 | 1549 | |
2f77fc4b | 1550 | /* |
88f06f15 JG |
1551 | * Internal version of cmd_enable_event() with a supplemental |
1552 | * "internal_event" flag which is used to enable internal events which should | |
1553 | * be hidden from clients. Such events are used in the agent implementation to | |
1554 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1555 | */ |
88f06f15 JG |
1556 | static int _cmd_enable_event(struct ltt_session *session, |
1557 | struct lttng_domain *domain, | |
025faf73 | 1558 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1559 | char *filter_expression, |
db8f1377 JI |
1560 | struct lttng_filter_bytecode *filter, |
1561 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1562 | int wpipe, bool internal_event) |
2f77fc4b | 1563 | { |
e5f5db7f | 1564 | int ret, channel_created = 0; |
2f77fc4b DG |
1565 | struct lttng_channel *attr; |
1566 | ||
1567 | assert(session); | |
1568 | assert(event); | |
1569 | assert(channel_name); | |
1570 | ||
2a385866 JG |
1571 | /* If we have a filter, we must have its filter expression */ |
1572 | assert(!(!!filter_expression ^ !!filter)); | |
1573 | ||
18a720cd MD |
1574 | DBG("Enable event command for event \'%s\'", event->name); |
1575 | ||
f5ac4bd7 MD |
1576 | rcu_read_lock(); |
1577 | ||
930a2e99 JG |
1578 | ret = validate_event_name(event->name); |
1579 | if (ret) { | |
1580 | goto error; | |
1581 | } | |
1582 | ||
7972aab2 | 1583 | switch (domain->type) { |
2f77fc4b DG |
1584 | case LTTNG_DOMAIN_KERNEL: |
1585 | { | |
1586 | struct ltt_kernel_channel *kchan; | |
1587 | ||
85076754 MD |
1588 | /* |
1589 | * If a non-default channel has been created in the | |
1590 | * session, explicitely require that -c chan_name needs | |
1591 | * to be provided. | |
1592 | */ | |
1593 | if (session->kernel_session->has_non_default_channel | |
1594 | && channel_name[0] == '\0') { | |
1595 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1596 | goto error; | |
1597 | } | |
1598 | ||
2f77fc4b DG |
1599 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1600 | session->kernel_session); | |
1601 | if (kchan == NULL) { | |
0a9c6494 DG |
1602 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1603 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1604 | if (attr == NULL) { |
f73fabfd | 1605 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1606 | goto error; |
1607 | } | |
1608 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1609 | ||
1610 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1611 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1612 | free(attr); |
1613 | goto error; | |
1614 | } | |
1615 | free(attr); | |
e5f5db7f DG |
1616 | |
1617 | channel_created = 1; | |
2f77fc4b DG |
1618 | } |
1619 | ||
1620 | /* Get the newly created kernel channel pointer */ | |
1621 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1622 | session->kernel_session); | |
1623 | if (kchan == NULL) { | |
1624 | /* This sould not happen... */ | |
f73fabfd | 1625 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1626 | goto error; |
1627 | } | |
1628 | ||
6e911cad MD |
1629 | switch (event->type) { |
1630 | case LTTNG_EVENT_ALL: | |
29c62722 | 1631 | { |
00a62084 MD |
1632 | char *filter_expression_a = NULL; |
1633 | struct lttng_filter_bytecode *filter_a = NULL; | |
1634 | ||
1635 | /* | |
1636 | * We need to duplicate filter_expression and filter, | |
1637 | * because ownership is passed to first enable | |
1638 | * event. | |
1639 | */ | |
1640 | if (filter_expression) { | |
1641 | filter_expression_a = strdup(filter_expression); | |
1642 | if (!filter_expression_a) { | |
1643 | ret = LTTNG_ERR_FATAL; | |
1644 | goto error; | |
1645 | } | |
1646 | } | |
1647 | if (filter) { | |
1648 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1649 | if (!filter_a) { | |
1650 | free(filter_expression_a); | |
1651 | ret = LTTNG_ERR_FATAL; | |
1652 | goto error; | |
1653 | } | |
1654 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1655 | } | |
29c62722 | 1656 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1657 | ret = event_kernel_enable_event(kchan, event, |
1658 | filter_expression, filter); | |
a969e101 MD |
1659 | /* We have passed ownership */ |
1660 | filter_expression = NULL; | |
1661 | filter = NULL; | |
29c62722 MD |
1662 | if (ret != LTTNG_OK) { |
1663 | if (channel_created) { | |
1664 | /* Let's not leak a useless channel. */ | |
1665 | kernel_destroy_channel(kchan); | |
1666 | } | |
00a62084 MD |
1667 | free(filter_expression_a); |
1668 | free(filter_a); | |
29c62722 MD |
1669 | goto error; |
1670 | } | |
1671 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1672 | ret = event_kernel_enable_event(kchan, event, |
1673 | filter_expression_a, filter_a); | |
60d21fa2 AB |
1674 | /* We have passed ownership */ |
1675 | filter_expression_a = NULL; | |
1676 | filter_a = NULL; | |
29c62722 MD |
1677 | if (ret != LTTNG_OK) { |
1678 | goto error; | |
1679 | } | |
1680 | break; | |
1681 | } | |
6e6ef3d7 DG |
1682 | case LTTNG_EVENT_PROBE: |
1683 | case LTTNG_EVENT_FUNCTION: | |
1684 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1685 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
1686 | ret = event_kernel_enable_event(kchan, event, |
1687 | filter_expression, filter); | |
a969e101 MD |
1688 | /* We have passed ownership */ |
1689 | filter_expression = NULL; | |
1690 | filter = NULL; | |
6e911cad MD |
1691 | if (ret != LTTNG_OK) { |
1692 | if (channel_created) { | |
1693 | /* Let's not leak a useless channel. */ | |
1694 | kernel_destroy_channel(kchan); | |
1695 | } | |
1696 | goto error; | |
e5f5db7f | 1697 | } |
6e911cad MD |
1698 | break; |
1699 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1700 | ret = event_kernel_enable_event(kchan, event, |
1701 | filter_expression, filter); | |
a969e101 MD |
1702 | /* We have passed ownership */ |
1703 | filter_expression = NULL; | |
1704 | filter = NULL; | |
e2b957af MD |
1705 | if (ret != LTTNG_OK) { |
1706 | goto error; | |
1707 | } | |
6e911cad MD |
1708 | break; |
1709 | default: | |
1710 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1711 | goto error; |
1712 | } | |
1713 | ||
1714 | kernel_wait_quiescent(kernel_tracer_fd); | |
1715 | break; | |
1716 | } | |
1717 | case LTTNG_DOMAIN_UST: | |
1718 | { | |
1719 | struct ltt_ust_channel *uchan; | |
1720 | struct ltt_ust_session *usess = session->ust_session; | |
1721 | ||
1722 | assert(usess); | |
1723 | ||
85076754 MD |
1724 | /* |
1725 | * If a non-default channel has been created in the | |
1726 | * session, explicitely require that -c chan_name needs | |
1727 | * to be provided. | |
1728 | */ | |
1729 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1730 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1731 | goto error; | |
1732 | } | |
1733 | ||
2f77fc4b DG |
1734 | /* Get channel from global UST domain */ |
1735 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1736 | channel_name); | |
1737 | if (uchan == NULL) { | |
1738 | /* Create default channel */ | |
0a9c6494 DG |
1739 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
1740 | usess->buffer_type); | |
2f77fc4b | 1741 | if (attr == NULL) { |
f73fabfd | 1742 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1743 | goto error; |
1744 | } | |
1745 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1746 | ||
1747 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1748 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1749 | free(attr); |
1750 | goto error; | |
1751 | } | |
1752 | free(attr); | |
1753 | ||
1754 | /* Get the newly created channel reference back */ | |
1755 | uchan = trace_ust_find_channel_by_name( | |
1756 | usess->domain_global.channels, channel_name); | |
1757 | assert(uchan); | |
1758 | } | |
1759 | ||
141feb8c JG |
1760 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
1761 | /* | |
1762 | * Don't allow users to add UST events to channels which | |
1763 | * are assigned to a userspace subdomain (JUL, Log4J, | |
1764 | * Python, etc.). | |
1765 | */ | |
1766 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
1767 | goto error; | |
1768 | } | |
1769 | ||
dac8e046 JG |
1770 | if (!internal_event) { |
1771 | /* | |
1772 | * Ensure the event name is not reserved for internal | |
1773 | * use. | |
1774 | */ | |
1775 | ret = validate_ust_event_name(event->name); | |
1776 | if (ret) { | |
1777 | WARN("Userspace event name %s failed validation.", | |
1778 | event->name ? | |
1779 | event->name : "NULL"); | |
1780 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1781 | goto error; | |
1782 | } | |
1783 | } | |
1784 | ||
2f77fc4b | 1785 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 1786 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
1787 | filter_expression, filter, exclusion, |
1788 | internal_event); | |
49d21f93 MD |
1789 | /* We have passed ownership */ |
1790 | filter_expression = NULL; | |
1791 | filter = NULL; | |
1792 | exclusion = NULL; | |
f73fabfd | 1793 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1794 | goto error; |
1795 | } | |
1796 | break; | |
1797 | } | |
5cdb6027 | 1798 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1799 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1800 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1801 | { |
da6c3a50 | 1802 | const char *default_event_name, *default_chan_name; |
fefd409b | 1803 | struct agent *agt; |
f20baf8e DG |
1804 | struct lttng_event uevent; |
1805 | struct lttng_domain tmp_dom; | |
1806 | struct ltt_ust_session *usess = session->ust_session; | |
1807 | ||
1808 | assert(usess); | |
1809 | ||
5cdb6027 | 1810 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 1811 | if (!agt) { |
5cdb6027 | 1812 | agt = agent_create(domain->type); |
fefd409b | 1813 | if (!agt) { |
e5b3c48c | 1814 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
1815 | goto error; |
1816 | } | |
1817 | agent_add(agt, usess->agents); | |
1818 | } | |
1819 | ||
022d91ba | 1820 | /* Create the default tracepoint. */ |
996de3c7 | 1821 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
1822 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
1823 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
1824 | default_event_name = event_get_default_agent_ust_name( |
1825 | domain->type); | |
da6c3a50 | 1826 | if (!default_event_name) { |
e5b3c48c | 1827 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 1828 | goto error; |
f43f95a9 | 1829 | } |
da6c3a50 | 1830 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
1831 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
1832 | ||
1833 | /* | |
1834 | * The domain type is changed because we are about to enable the | |
1835 | * default channel and event for the JUL domain that are hardcoded. | |
1836 | * This happens in the UST domain. | |
1837 | */ | |
1838 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
1839 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
1840 | ||
0e115563 DG |
1841 | switch (domain->type) { |
1842 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 1843 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
1844 | break; |
1845 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 1846 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
1847 | break; |
1848 | case LTTNG_DOMAIN_PYTHON: | |
1849 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
1850 | break; | |
1851 | default: | |
e98a44b0 | 1852 | /* The switch/case we are in makes this impossible */ |
0e115563 | 1853 | assert(0); |
da6c3a50 DG |
1854 | } |
1855 | ||
971da06a | 1856 | { |
8404118c | 1857 | char *filter_expression_copy = NULL; |
51755dc8 | 1858 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
1859 | |
1860 | if (filter) { | |
51755dc8 JG |
1861 | const size_t filter_size = sizeof( |
1862 | struct lttng_filter_bytecode) | |
1863 | + filter->len; | |
1864 | ||
1865 | filter_copy = zmalloc(filter_size); | |
971da06a | 1866 | if (!filter_copy) { |
018096a4 | 1867 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 1868 | goto error; |
971da06a | 1869 | } |
51755dc8 | 1870 | memcpy(filter_copy, filter, filter_size); |
971da06a | 1871 | |
8404118c JG |
1872 | filter_expression_copy = |
1873 | strdup(filter_expression); | |
1874 | if (!filter_expression) { | |
1875 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
1876 | } |
1877 | ||
1878 | if (!filter_expression_copy || !filter_copy) { | |
1879 | free(filter_expression_copy); | |
1880 | free(filter_copy); | |
1881 | goto error; | |
8404118c | 1882 | } |
971da06a JG |
1883 | } |
1884 | ||
88f06f15 | 1885 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 1886 | (char *) default_chan_name, |
8404118c JG |
1887 | &uevent, filter_expression_copy, |
1888 | filter_copy, NULL, wpipe); | |
971da06a JG |
1889 | } |
1890 | ||
f20baf8e DG |
1891 | if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) { |
1892 | goto error; | |
1893 | } | |
1894 | ||
1895 | /* The wild card * means that everything should be enabled. */ | |
1896 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
1897 | ret = event_agent_enable_all(usess, agt, event, filter, |
1898 | filter_expression); | |
f20baf8e | 1899 | } else { |
8404118c JG |
1900 | ret = event_agent_enable(usess, agt, event, filter, |
1901 | filter_expression); | |
f20baf8e | 1902 | } |
51755dc8 JG |
1903 | filter = NULL; |
1904 | filter_expression = NULL; | |
f20baf8e DG |
1905 | if (ret != LTTNG_OK) { |
1906 | goto error; | |
1907 | } | |
1908 | ||
1909 | break; | |
1910 | } | |
2f77fc4b | 1911 | default: |
f73fabfd | 1912 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1913 | goto error; |
1914 | } | |
1915 | ||
f73fabfd | 1916 | ret = LTTNG_OK; |
2f77fc4b DG |
1917 | |
1918 | error: | |
49d21f93 MD |
1919 | free(filter_expression); |
1920 | free(filter); | |
1921 | free(exclusion); | |
2223c96f | 1922 | rcu_read_unlock(); |
2f77fc4b DG |
1923 | return ret; |
1924 | } | |
1925 | ||
88f06f15 JG |
1926 | /* |
1927 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
1928 | * We own filter, exclusion, and filter_expression. | |
1929 | */ | |
1930 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
1931 | char *channel_name, struct lttng_event *event, | |
1932 | char *filter_expression, | |
1933 | struct lttng_filter_bytecode *filter, | |
1934 | struct lttng_event_exclusion *exclusion, | |
1935 | int wpipe) | |
1936 | { | |
1937 | return _cmd_enable_event(session, domain, channel_name, event, | |
1938 | filter_expression, filter, exclusion, wpipe, false); | |
1939 | } | |
1940 | ||
1941 | /* | |
1942 | * Enable an event which is internal to LTTng. An internal should | |
1943 | * never be made visible to clients and are immune to checks such as | |
1944 | * reserved names. | |
1945 | */ | |
1946 | static int cmd_enable_event_internal(struct ltt_session *session, | |
1947 | struct lttng_domain *domain, | |
1948 | char *channel_name, struct lttng_event *event, | |
1949 | char *filter_expression, | |
1950 | struct lttng_filter_bytecode *filter, | |
1951 | struct lttng_event_exclusion *exclusion, | |
1952 | int wpipe) | |
1953 | { | |
1954 | return _cmd_enable_event(session, domain, channel_name, event, | |
1955 | filter_expression, filter, exclusion, wpipe, true); | |
1956 | } | |
1957 | ||
2f77fc4b DG |
1958 | /* |
1959 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
1960 | */ | |
56a37563 JG |
1961 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
1962 | struct lttng_event **events) | |
2f77fc4b DG |
1963 | { |
1964 | int ret; | |
1965 | ssize_t nb_events = 0; | |
1966 | ||
1967 | switch (domain) { | |
1968 | case LTTNG_DOMAIN_KERNEL: | |
1969 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
1970 | if (nb_events < 0) { | |
f73fabfd | 1971 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
1972 | goto error; |
1973 | } | |
1974 | break; | |
1975 | case LTTNG_DOMAIN_UST: | |
1976 | nb_events = ust_app_list_events(events); | |
1977 | if (nb_events < 0) { | |
f73fabfd | 1978 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
1979 | goto error; |
1980 | } | |
1981 | break; | |
5cdb6027 | 1982 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 1983 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1984 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 1985 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
1986 | if (nb_events < 0) { |
1987 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
1988 | goto error; | |
1989 | } | |
1990 | break; | |
2f77fc4b | 1991 | default: |
f73fabfd | 1992 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1993 | goto error; |
1994 | } | |
1995 | ||
1996 | return nb_events; | |
1997 | ||
1998 | error: | |
1999 | /* Return negative value to differentiate return code */ | |
2000 | return -ret; | |
2001 | } | |
2002 | ||
2003 | /* | |
2004 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2005 | */ | |
56a37563 | 2006 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2007 | struct lttng_event_field **fields) |
2008 | { | |
2009 | int ret; | |
2010 | ssize_t nb_fields = 0; | |
2011 | ||
2012 | switch (domain) { | |
2013 | case LTTNG_DOMAIN_UST: | |
2014 | nb_fields = ust_app_list_event_fields(fields); | |
2015 | if (nb_fields < 0) { | |
f73fabfd | 2016 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2017 | goto error; |
2018 | } | |
2019 | break; | |
2020 | case LTTNG_DOMAIN_KERNEL: | |
2021 | default: /* fall-through */ | |
f73fabfd | 2022 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2023 | goto error; |
2024 | } | |
2025 | ||
2026 | return nb_fields; | |
2027 | ||
2028 | error: | |
2029 | /* Return negative value to differentiate return code */ | |
2030 | return -ret; | |
2031 | } | |
2032 | ||
834978fd DG |
2033 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2034 | { | |
2035 | return syscall_table_list(events); | |
2036 | } | |
2037 | ||
a5dfbb9d MD |
2038 | /* |
2039 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2040 | * | |
2041 | * Called with session lock held. | |
2042 | */ | |
2043 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2044 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2045 | { |
2046 | int ret; | |
2047 | ssize_t nr_pids = 0; | |
2048 | ||
2049 | switch (domain) { | |
2050 | case LTTNG_DOMAIN_KERNEL: | |
2051 | { | |
2052 | struct ltt_kernel_session *ksess; | |
2053 | ||
2054 | ksess = session->kernel_session; | |
2055 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2056 | if (nr_pids < 0) { | |
2057 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2058 | goto error; | |
2059 | } | |
2060 | break; | |
2061 | } | |
2062 | case LTTNG_DOMAIN_UST: | |
2063 | { | |
2064 | struct ltt_ust_session *usess; | |
2065 | ||
2066 | usess = session->ust_session; | |
2067 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2068 | if (nr_pids < 0) { | |
2069 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2070 | goto error; | |
2071 | } | |
2072 | break; | |
2073 | } | |
2074 | case LTTNG_DOMAIN_LOG4J: | |
2075 | case LTTNG_DOMAIN_JUL: | |
2076 | case LTTNG_DOMAIN_PYTHON: | |
2077 | default: | |
2078 | ret = LTTNG_ERR_UND; | |
2079 | goto error; | |
2080 | } | |
2081 | ||
2082 | return nr_pids; | |
2083 | ||
2084 | error: | |
2085 | /* Return negative value to differentiate return code */ | |
2086 | return -ret; | |
2087 | } | |
2088 | ||
2f77fc4b DG |
2089 | /* |
2090 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2091 | * |
2092 | * Called with session mutex held. | |
2f77fc4b DG |
2093 | */ |
2094 | int cmd_start_trace(struct ltt_session *session) | |
2095 | { | |
2096 | int ret; | |
cde3e505 | 2097 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2098 | struct ltt_kernel_session *ksession; |
2099 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2100 | |
2101 | assert(session); | |
2102 | ||
2103 | /* Ease our life a bit ;) */ | |
2104 | ksession = session->kernel_session; | |
2105 | usess = session->ust_session; | |
2106 | ||
8382cf6f DG |
2107 | /* Is the session already started? */ |
2108 | if (session->active) { | |
f73fabfd | 2109 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2110 | goto error; |
2111 | } | |
2112 | ||
cde3e505 DG |
2113 | /* |
2114 | * Starting a session without channel is useless since after that it's not | |
2115 | * possible to enable channel thus inform the client. | |
2116 | */ | |
2117 | if (usess && usess->domain_global.channels) { | |
2118 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2119 | } | |
2120 | if (ksession) { | |
2121 | nb_chan += ksession->channel_count; | |
2122 | } | |
2123 | if (!nb_chan) { | |
2124 | ret = LTTNG_ERR_NO_CHANNEL; | |
2125 | goto error; | |
2126 | } | |
2127 | ||
2f77fc4b DG |
2128 | /* Kernel tracing */ |
2129 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2130 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2131 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2132 | goto error; |
2133 | } | |
2f77fc4b DG |
2134 | } |
2135 | ||
2136 | /* Flag session that trace should start automatically */ | |
2137 | if (usess) { | |
14fb1ebe DG |
2138 | /* |
2139 | * Even though the start trace might fail, flag this session active so | |
2140 | * other application coming in are started by default. | |
2141 | */ | |
2142 | usess->active = 1; | |
2f77fc4b DG |
2143 | |
2144 | ret = ust_app_start_trace_all(usess); | |
2145 | if (ret < 0) { | |
f73fabfd | 2146 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2147 | goto error; |
2148 | } | |
2149 | } | |
2150 | ||
8382cf6f DG |
2151 | /* Flag this after a successful start. */ |
2152 | session->has_been_started = 1; | |
2153 | session->active = 1; | |
9b6c7ec5 | 2154 | |
f73fabfd | 2155 | ret = LTTNG_OK; |
2f77fc4b DG |
2156 | |
2157 | error: | |
2158 | return ret; | |
2159 | } | |
2160 | ||
2161 | /* | |
2162 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2163 | */ | |
2164 | int cmd_stop_trace(struct ltt_session *session) | |
2165 | { | |
2166 | int ret; | |
2167 | struct ltt_kernel_channel *kchan; | |
2168 | struct ltt_kernel_session *ksession; | |
2169 | struct ltt_ust_session *usess; | |
2170 | ||
2171 | assert(session); | |
2172 | ||
2173 | /* Short cut */ | |
2174 | ksession = session->kernel_session; | |
2175 | usess = session->ust_session; | |
2176 | ||
8382cf6f DG |
2177 | /* Session is not active. Skip everythong and inform the client. */ |
2178 | if (!session->active) { | |
f73fabfd | 2179 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2180 | goto error; |
2181 | } | |
2182 | ||
2f77fc4b | 2183 | /* Kernel tracer */ |
14fb1ebe | 2184 | if (ksession && ksession->active) { |
2f77fc4b DG |
2185 | DBG("Stop kernel tracing"); |
2186 | ||
2187 | /* Flush metadata if exist */ | |
2188 | if (ksession->metadata_stream_fd >= 0) { | |
2189 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2190 | if (ret < 0) { | |
2191 | ERR("Kernel metadata flush failed"); | |
2192 | } | |
2193 | } | |
2194 | ||
2195 | /* Flush all buffers before stopping */ | |
2196 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2197 | ret = kernel_flush_buffer(kchan); | |
2198 | if (ret < 0) { | |
2199 | ERR("Kernel flush buffer error"); | |
2200 | } | |
2201 | } | |
2202 | ||
2203 | ret = kernel_stop_session(ksession); | |
2204 | if (ret < 0) { | |
f73fabfd | 2205 | ret = LTTNG_ERR_KERN_STOP_FAIL; |
2f77fc4b DG |
2206 | goto error; |
2207 | } | |
2208 | ||
2209 | kernel_wait_quiescent(kernel_tracer_fd); | |
9b6c7ec5 | 2210 | |
14fb1ebe | 2211 | ksession->active = 0; |
2f77fc4b DG |
2212 | } |
2213 | ||
14fb1ebe DG |
2214 | if (usess && usess->active) { |
2215 | /* | |
2216 | * Even though the stop trace might fail, flag this session inactive so | |
2217 | * other application coming in are not started by default. | |
2218 | */ | |
2219 | usess->active = 0; | |
2f77fc4b DG |
2220 | |
2221 | ret = ust_app_stop_trace_all(usess); | |
2222 | if (ret < 0) { | |
f73fabfd | 2223 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2224 | goto error; |
2225 | } | |
2226 | } | |
2227 | ||
8382cf6f DG |
2228 | /* Flag inactive after a successful stop. */ |
2229 | session->active = 0; | |
f73fabfd | 2230 | ret = LTTNG_OK; |
2f77fc4b DG |
2231 | |
2232 | error: | |
2233 | return ret; | |
2234 | } | |
2235 | ||
2236 | /* | |
2237 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2238 | */ | |
bda32d56 JG |
2239 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2240 | struct lttng_uri *uris) | |
2f77fc4b DG |
2241 | { |
2242 | int ret, i; | |
2243 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2244 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2245 | |
2246 | assert(session); | |
2247 | assert(uris); | |
2248 | assert(nb_uri > 0); | |
2249 | ||
8382cf6f DG |
2250 | /* Can't set consumer URI if the session is active. */ |
2251 | if (session->active) { | |
f73fabfd | 2252 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2253 | goto error; |
2254 | } | |
2255 | ||
bda32d56 | 2256 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2257 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2258 | ret = add_uri_to_consumer(session->consumer, |
2259 | &uris[i], 0, session->name); | |
a74934ba | 2260 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2261 | goto error; |
2262 | } | |
2f77fc4b DG |
2263 | } |
2264 | ||
bda32d56 JG |
2265 | /* Set UST session URIs */ |
2266 | if (session->ust_session) { | |
2267 | for (i = 0; i < nb_uri; i++) { | |
2268 | ret = add_uri_to_consumer( | |
2269 | session->ust_session->consumer, | |
2270 | &uris[i], LTTNG_DOMAIN_UST, | |
2271 | session->name); | |
2272 | if (ret != LTTNG_OK) { | |
2273 | goto error; | |
2274 | } | |
2275 | } | |
2276 | } | |
2277 | ||
2278 | /* Set kernel session URIs */ | |
2279 | if (session->kernel_session) { | |
2280 | for (i = 0; i < nb_uri; i++) { | |
2281 | ret = add_uri_to_consumer( | |
2282 | session->kernel_session->consumer, | |
2283 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2284 | session->name); | |
2285 | if (ret != LTTNG_OK) { | |
2286 | goto error; | |
2287 | } | |
2288 | } | |
2289 | } | |
2290 | ||
7ab70fe0 DG |
2291 | /* |
2292 | * Make sure to set the session in output mode after we set URI since a | |
2293 | * session can be created without URL (thus flagged in no output mode). | |
2294 | */ | |
2295 | session->output_traces = 1; | |
2296 | if (ksess) { | |
2297 | ksess->output_traces = 1; | |
bda32d56 JG |
2298 | } |
2299 | ||
2300 | if (usess) { | |
7ab70fe0 DG |
2301 | usess->output_traces = 1; |
2302 | } | |
2303 | ||
2f77fc4b | 2304 | /* All good! */ |
f73fabfd | 2305 | ret = LTTNG_OK; |
2f77fc4b DG |
2306 | |
2307 | error: | |
2308 | return ret; | |
2309 | } | |
2310 | ||
2311 | /* | |
2312 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2313 | */ | |
2314 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2315 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2316 | { |
2317 | int ret; | |
2f77fc4b DG |
2318 | struct ltt_session *session; |
2319 | ||
2320 | assert(name); | |
2bba9e53 | 2321 | assert(creds); |
785d2d0d | 2322 | |
2f77fc4b DG |
2323 | /* |
2324 | * Verify if the session already exist | |
2325 | * | |
2326 | * XXX: There is no need for the session lock list here since the caller | |
2327 | * (process_client_msg) is holding it. We might want to change that so a | |
2328 | * single command does not lock the entire session list. | |
2329 | */ | |
2330 | session = session_find_by_name(name); | |
2331 | if (session != NULL) { | |
f73fabfd | 2332 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2333 | goto find_error; |
2334 | } | |
2335 | ||
2336 | /* Create tracing session in the registry */ | |
dec56f6c | 2337 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2338 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2339 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2340 | goto session_error; |
2341 | } | |
2342 | ||
2343 | /* | |
2344 | * Get the newly created session pointer back | |
2345 | * | |
2346 | * XXX: There is no need for the session lock list here since the caller | |
2347 | * (process_client_msg) is holding it. We might want to change that so a | |
2348 | * single command does not lock the entire session list. | |
2349 | */ | |
2350 | session = session_find_by_name(name); | |
2351 | assert(session); | |
2352 | ||
ecc48a90 | 2353 | session->live_timer = live_timer; |
2f77fc4b DG |
2354 | /* Create default consumer output for the session not yet created. */ |
2355 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2356 | if (session->consumer == NULL) { | |
f73fabfd | 2357 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2358 | goto consumer_error; |
2359 | } | |
2360 | ||
2bba9e53 | 2361 | if (uris) { |
bda32d56 | 2362 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2363 | if (ret != LTTNG_OK) { |
2364 | goto consumer_error; | |
2365 | } | |
2366 | session->output_traces = 1; | |
2367 | } else { | |
2368 | session->output_traces = 0; | |
2369 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2370 | } |
2371 | ||
2372 | session->consumer->enabled = 1; | |
2373 | ||
f73fabfd | 2374 | return LTTNG_OK; |
2f77fc4b DG |
2375 | |
2376 | consumer_error: | |
2377 | session_destroy(session); | |
2378 | session_error: | |
2379 | find_error: | |
2380 | return ret; | |
2381 | } | |
2382 | ||
27babd3a DG |
2383 | /* |
2384 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2385 | */ | |
2386 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2387 | size_t nb_uri, lttng_sock_cred *creds) | |
2388 | { | |
2389 | int ret; | |
2390 | struct ltt_session *session; | |
2391 | struct snapshot_output *new_output = NULL; | |
2392 | ||
2393 | assert(name); | |
2394 | assert(creds); | |
2395 | ||
2396 | /* | |
2397 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2398 | * received are for a default snapshot output if one. | |
2399 | */ | |
ae58b817 | 2400 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2401 | if (ret != LTTNG_OK) { |
2402 | goto error; | |
2403 | } | |
2404 | ||
2405 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2406 | session = session_find_by_name(name); | |
2407 | assert(session); | |
2408 | ||
2409 | /* Flag session for snapshot mode. */ | |
2410 | session->snapshot_mode = 1; | |
2411 | ||
2412 | /* Skip snapshot output creation if no URI is given. */ | |
2413 | if (nb_uri == 0) { | |
2414 | goto end; | |
2415 | } | |
2416 | ||
2417 | new_output = snapshot_output_alloc(); | |
2418 | if (!new_output) { | |
2419 | ret = LTTNG_ERR_NOMEM; | |
2420 | goto error_snapshot_alloc; | |
2421 | } | |
2422 | ||
2423 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2424 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2425 | if (ret < 0) { | |
2426 | if (ret == -ENOMEM) { | |
2427 | ret = LTTNG_ERR_NOMEM; | |
2428 | } else { | |
2429 | ret = LTTNG_ERR_INVALID; | |
2430 | } | |
2431 | goto error_snapshot; | |
2432 | } | |
2433 | ||
2434 | rcu_read_lock(); | |
2435 | snapshot_add_output(&session->snapshot, new_output); | |
2436 | rcu_read_unlock(); | |
2437 | ||
2438 | end: | |
2439 | return LTTNG_OK; | |
2440 | ||
2441 | error_snapshot: | |
2442 | snapshot_output_destroy(new_output); | |
2443 | error_snapshot_alloc: | |
2444 | session_destroy(session); | |
2445 | error: | |
2446 | return ret; | |
2447 | } | |
2448 | ||
2f77fc4b DG |
2449 | /* |
2450 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2451 | * |
2452 | * Called with session lock held. | |
2f77fc4b DG |
2453 | */ |
2454 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2455 | { | |
2456 | int ret; | |
2457 | struct ltt_ust_session *usess; | |
2458 | struct ltt_kernel_session *ksess; | |
2459 | ||
2460 | /* Safety net */ | |
2461 | assert(session); | |
2462 | ||
2463 | usess = session->ust_session; | |
2464 | ksess = session->kernel_session; | |
2465 | ||
2466 | /* Clean kernel session teardown */ | |
2467 | kernel_destroy_session(ksess); | |
2468 | ||
2469 | /* UST session teardown */ | |
2470 | if (usess) { | |
2471 | /* Close any relayd session */ | |
2472 | consumer_output_send_destroy_relayd(usess->consumer); | |
2473 | ||
2474 | /* Destroy every UST application related to this session. */ | |
2475 | ret = ust_app_destroy_trace_all(usess); | |
2476 | if (ret) { | |
2477 | ERR("Error in ust_app_destroy_trace_all"); | |
2478 | } | |
2479 | ||
2480 | /* Clean up the rest. */ | |
2481 | trace_ust_destroy_session(usess); | |
2482 | } | |
2483 | ||
2484 | /* | |
2485 | * Must notify the kernel thread here to update it's poll set in order to | |
2486 | * remove the channel(s)' fd just destroyed. | |
2487 | */ | |
2488 | ret = notify_thread_pipe(wpipe); | |
2489 | if (ret < 0) { | |
2490 | PERROR("write kernel poll pipe"); | |
2491 | } | |
2492 | ||
2493 | ret = session_destroy(session); | |
2494 | ||
2495 | return ret; | |
2496 | } | |
2497 | ||
2498 | /* | |
2499 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2500 | */ | |
56a37563 JG |
2501 | int cmd_calibrate(enum lttng_domain_type domain, |
2502 | struct lttng_calibrate *calibrate) | |
2f77fc4b DG |
2503 | { |
2504 | int ret; | |
2505 | ||
2506 | switch (domain) { | |
2507 | case LTTNG_DOMAIN_KERNEL: | |
2508 | { | |
2509 | struct lttng_kernel_calibrate kcalibrate; | |
2510 | ||
2e84128e DG |
2511 | switch (calibrate->type) { |
2512 | case LTTNG_CALIBRATE_FUNCTION: | |
2513 | default: | |
2514 | /* Default and only possible calibrate option. */ | |
2515 | kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE; | |
2516 | break; | |
2517 | } | |
2518 | ||
2f77fc4b DG |
2519 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); |
2520 | if (ret < 0) { | |
f73fabfd | 2521 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2f77fc4b DG |
2522 | goto error; |
2523 | } | |
2524 | break; | |
2525 | } | |
2526 | case LTTNG_DOMAIN_UST: | |
2527 | { | |
2528 | struct lttng_ust_calibrate ucalibrate; | |
2529 | ||
2e84128e DG |
2530 | switch (calibrate->type) { |
2531 | case LTTNG_CALIBRATE_FUNCTION: | |
2532 | default: | |
2533 | /* Default and only possible calibrate option. */ | |
2534 | ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT; | |
2535 | break; | |
2536 | } | |
2537 | ||
2f77fc4b DG |
2538 | ret = ust_app_calibrate_glb(&ucalibrate); |
2539 | if (ret < 0) { | |
f73fabfd | 2540 | ret = LTTNG_ERR_UST_CALIBRATE_FAIL; |
2f77fc4b DG |
2541 | goto error; |
2542 | } | |
2543 | break; | |
2544 | } | |
2545 | default: | |
f73fabfd | 2546 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2547 | goto error; |
2548 | } | |
2549 | ||
f73fabfd | 2550 | ret = LTTNG_OK; |
2f77fc4b DG |
2551 | |
2552 | error: | |
2553 | return ret; | |
2554 | } | |
2555 | ||
2556 | /* | |
2557 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2558 | */ | |
56a37563 JG |
2559 | int cmd_register_consumer(struct ltt_session *session, |
2560 | enum lttng_domain_type domain, const char *sock_path, | |
2561 | struct consumer_data *cdata) | |
2f77fc4b DG |
2562 | { |
2563 | int ret, sock; | |
dd81b457 | 2564 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2565 | |
2566 | assert(session); | |
2567 | assert(cdata); | |
2568 | assert(sock_path); | |
2569 | ||
2570 | switch (domain) { | |
2571 | case LTTNG_DOMAIN_KERNEL: | |
2572 | { | |
2573 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2574 | ||
2575 | assert(ksess); | |
2576 | ||
2577 | /* Can't register a consumer if there is already one */ | |
2578 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2579 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2580 | goto error; |
2581 | } | |
2582 | ||
2583 | sock = lttcomm_connect_unix_sock(sock_path); | |
2584 | if (sock < 0) { | |
f73fabfd | 2585 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2586 | goto error; |
2587 | } | |
4ce514c4 | 2588 | cdata->cmd_sock = sock; |
2f77fc4b | 2589 | |
4ce514c4 | 2590 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2591 | if (socket == NULL) { |
f66c074c DG |
2592 | ret = close(sock); |
2593 | if (ret < 0) { | |
2594 | PERROR("close register consumer"); | |
2595 | } | |
4ce514c4 | 2596 | cdata->cmd_sock = -1; |
f73fabfd | 2597 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2598 | goto error; |
2599 | } | |
2600 | ||
2601 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2602 | if (socket->lock == NULL) { | |
2603 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2604 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2605 | goto error; |
2606 | } | |
2607 | pthread_mutex_init(socket->lock, NULL); | |
2608 | socket->registered = 1; | |
2609 | ||
2610 | rcu_read_lock(); | |
2611 | consumer_add_socket(socket, ksess->consumer); | |
2612 | rcu_read_unlock(); | |
2613 | ||
2614 | pthread_mutex_lock(&cdata->pid_mutex); | |
2615 | cdata->pid = -1; | |
2616 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2617 | ||
2618 | break; | |
2619 | } | |
2620 | default: | |
2621 | /* TODO: Userspace tracing */ | |
f73fabfd | 2622 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2623 | goto error; |
2624 | } | |
2625 | ||
dd81b457 | 2626 | return LTTNG_OK; |
2f77fc4b DG |
2627 | |
2628 | error: | |
dd81b457 DG |
2629 | if (socket) { |
2630 | consumer_destroy_socket(socket); | |
2631 | } | |
2f77fc4b DG |
2632 | return ret; |
2633 | } | |
2634 | ||
2635 | /* | |
2636 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2637 | */ | |
2638 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2639 | struct lttng_domain **domains) | |
2640 | { | |
2641 | int ret, index = 0; | |
2642 | ssize_t nb_dom = 0; | |
fefd409b DG |
2643 | struct agent *agt; |
2644 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2645 | |
2646 | if (session->kernel_session != NULL) { | |
2647 | DBG3("Listing domains found kernel domain"); | |
2648 | nb_dom++; | |
2649 | } | |
2650 | ||
2651 | if (session->ust_session != NULL) { | |
2652 | DBG3("Listing domains found UST global domain"); | |
2653 | nb_dom++; | |
3c6a091f | 2654 | |
e0a74f01 | 2655 | rcu_read_lock(); |
fefd409b DG |
2656 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2657 | agt, node.node) { | |
2658 | if (agt->being_used) { | |
2659 | nb_dom++; | |
2660 | } | |
3c6a091f | 2661 | } |
e0a74f01 | 2662 | rcu_read_unlock(); |
2f77fc4b DG |
2663 | } |
2664 | ||
fa64dfb4 JG |
2665 | if (!nb_dom) { |
2666 | goto end; | |
2667 | } | |
2668 | ||
2f77fc4b DG |
2669 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2670 | if (*domains == NULL) { | |
f73fabfd | 2671 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2672 | goto error; |
2673 | } | |
2674 | ||
2675 | if (session->kernel_session != NULL) { | |
2676 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
2677 | |
2678 | /* Kernel session buffer type is always GLOBAL */ | |
2679 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2680 | ||
2f77fc4b DG |
2681 | index++; |
2682 | } | |
2683 | ||
2684 | if (session->ust_session != NULL) { | |
2685 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2686 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2687 | index++; |
3c6a091f | 2688 | |
e0a74f01 | 2689 | rcu_read_lock(); |
fefd409b DG |
2690 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2691 | agt, node.node) { | |
2692 | if (agt->being_used) { | |
2693 | (*domains)[index].type = agt->domain; | |
2694 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2695 | index++; | |
2696 | } | |
3c6a091f | 2697 | } |
e0a74f01 | 2698 | rcu_read_unlock(); |
2f77fc4b | 2699 | } |
fa64dfb4 | 2700 | end: |
2f77fc4b DG |
2701 | return nb_dom; |
2702 | ||
2703 | error: | |
f73fabfd DG |
2704 | /* Return negative value to differentiate return code */ |
2705 | return -ret; | |
2f77fc4b DG |
2706 | } |
2707 | ||
2708 | ||
2709 | /* | |
2710 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2711 | */ | |
56a37563 JG |
2712 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
2713 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b DG |
2714 | { |
2715 | int ret; | |
2716 | ssize_t nb_chan = 0; | |
2717 | ||
2718 | switch (domain) { | |
2719 | case LTTNG_DOMAIN_KERNEL: | |
2720 | if (session->kernel_session != NULL) { | |
2721 | nb_chan = session->kernel_session->channel_count; | |
2722 | } | |
2723 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 DG |
2724 | if (nb_chan <= 0) { |
2725 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; | |
2726 | } | |
2f77fc4b DG |
2727 | break; |
2728 | case LTTNG_DOMAIN_UST: | |
2729 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2730 | rcu_read_lock(); |
2f77fc4b | 2731 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2732 | session->ust_session->domain_global.channels); |
2733 | rcu_read_unlock(); | |
2f77fc4b DG |
2734 | } |
2735 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2736 | if (nb_chan < 0) { |
c7d620a2 | 2737 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
ade7ce52 | 2738 | goto error; |
c7d620a2 | 2739 | } |
2f77fc4b DG |
2740 | break; |
2741 | default: | |
f73fabfd | 2742 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2743 | goto error; |
2744 | } | |
2745 | ||
2746 | if (nb_chan > 0) { | |
2747 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
2748 | if (*channels == NULL) { | |
f73fabfd | 2749 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2750 | goto error; |
2751 | } | |
2752 | ||
2753 | list_lttng_channels(domain, session, *channels); | |
2f77fc4b DG |
2754 | } |
2755 | ||
2756 | return nb_chan; | |
2757 | ||
2758 | error: | |
f73fabfd DG |
2759 | /* Return negative value to differentiate return code */ |
2760 | return -ret; | |
2f77fc4b DG |
2761 | } |
2762 | ||
2763 | /* | |
2764 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2765 | */ | |
56a37563 JG |
2766 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
2767 | struct ltt_session *session, char *channel_name, | |
2768 | struct lttng_event **events) | |
2f77fc4b DG |
2769 | { |
2770 | int ret = 0; | |
2771 | ssize_t nb_event = 0; | |
2772 | ||
2773 | switch (domain) { | |
2774 | case LTTNG_DOMAIN_KERNEL: | |
2775 | if (session->kernel_session != NULL) { | |
2776 | nb_event = list_lttng_kernel_events(channel_name, | |
2777 | session->kernel_session, events); | |
2778 | } | |
2779 | break; | |
2780 | case LTTNG_DOMAIN_UST: | |
2781 | { | |
2782 | if (session->ust_session != NULL) { | |
2783 | nb_event = list_lttng_ust_global_events(channel_name, | |
2784 | &session->ust_session->domain_global, events); | |
2785 | } | |
2786 | break; | |
2787 | } | |
5cdb6027 | 2788 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2789 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2790 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 2791 | if (session->ust_session) { |
fefd409b DG |
2792 | struct lttng_ht_iter iter; |
2793 | struct agent *agt; | |
2794 | ||
b11feea5 | 2795 | rcu_read_lock(); |
fefd409b DG |
2796 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
2797 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
2798 | if (agt->domain == domain) { |
2799 | nb_event = list_lttng_agent_events( | |
2800 | agt, events); | |
2801 | break; | |
2802 | } | |
fefd409b | 2803 | } |
b11feea5 | 2804 | rcu_read_unlock(); |
3c6a091f DG |
2805 | } |
2806 | break; | |
2f77fc4b | 2807 | default: |
f73fabfd | 2808 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2809 | goto error; |
2810 | } | |
2811 | ||
f73fabfd | 2812 | return nb_event; |
2f77fc4b DG |
2813 | |
2814 | error: | |
f73fabfd DG |
2815 | /* Return negative value to differentiate return code */ |
2816 | return -ret; | |
2f77fc4b DG |
2817 | } |
2818 | ||
2819 | /* | |
2820 | * Using the session list, filled a lttng_session array to send back to the | |
2821 | * client for session listing. | |
2822 | * | |
2823 | * The session list lock MUST be acquired before calling this function. Use | |
2824 | * session_lock_list() and session_unlock_list(). | |
2825 | */ | |
2826 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
2827 | gid_t gid) | |
2828 | { | |
2829 | int ret; | |
2830 | unsigned int i = 0; | |
2831 | struct ltt_session *session; | |
2832 | struct ltt_session_list *list = session_get_list(); | |
2833 | ||
2834 | DBG("Getting all available session for UID %d GID %d", | |
2835 | uid, gid); | |
2836 | /* | |
2837 | * Iterate over session list and append data after the control struct in | |
2838 | * the buffer. | |
2839 | */ | |
2840 | cds_list_for_each_entry(session, &list->head, list) { | |
2841 | /* | |
2842 | * Only list the sessions the user can control. | |
2843 | */ | |
2844 | if (!session_access_ok(session, uid, gid)) { | |
2845 | continue; | |
2846 | } | |
2847 | ||
2848 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2849 | struct ltt_ust_session *usess = session->ust_session; | |
2850 | ||
2851 | if (session->consumer->type == CONSUMER_DST_NET || | |
2852 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
2853 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
2854 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 2855 | sizeof(sessions[i].path), session); |
2f77fc4b | 2856 | } else { |
dec56f6c | 2857 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
2858 | session->consumer->dst.trace_path); |
2859 | } | |
2860 | if (ret < 0) { | |
2861 | PERROR("snprintf session path"); | |
2862 | continue; | |
2863 | } | |
2864 | ||
2865 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
2866 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 2867 | sessions[i].enabled = session->active; |
2cbf8fed | 2868 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 2869 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
2870 | i++; |
2871 | } | |
2872 | } | |
2873 | ||
806e2684 | 2874 | /* |
6d805429 | 2875 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 2876 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 2877 | */ |
6d805429 | 2878 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
2879 | { |
2880 | int ret; | |
2881 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2882 | struct ltt_ust_session *usess = session->ust_session; | |
2883 | ||
2884 | assert(session); | |
2885 | ||
2886 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 2887 | if (session->active) { |
806e2684 DG |
2888 | ret = LTTNG_ERR_SESSION_STARTED; |
2889 | goto error; | |
3a89d11a DG |
2890 | } else { |
2891 | /* | |
2892 | * If stopped, just make sure we've started before else the above call | |
2893 | * will always send that there is data pending. | |
2894 | * | |
2895 | * The consumer assumes that when the data pending command is received, | |
2896 | * the trace has been started before or else no output data is written | |
2897 | * by the streams which is a condition for data pending. So, this is | |
2898 | * *VERY* important that we don't ask the consumer before a start | |
2899 | * trace. | |
2900 | */ | |
8382cf6f | 2901 | if (!session->has_been_started) { |
3a89d11a DG |
2902 | ret = 0; |
2903 | goto error; | |
2904 | } | |
806e2684 DG |
2905 | } |
2906 | ||
2907 | if (ksess && ksess->consumer) { | |
6d805429 DG |
2908 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
2909 | if (ret == 1) { | |
806e2684 DG |
2910 | /* Data is still being extracted for the kernel. */ |
2911 | goto error; | |
2912 | } | |
2913 | } | |
2914 | ||
2915 | if (usess && usess->consumer) { | |
6d805429 DG |
2916 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
2917 | if (ret == 1) { | |
806e2684 DG |
2918 | /* Data is still being extracted for the kernel. */ |
2919 | goto error; | |
2920 | } | |
2921 | } | |
2922 | ||
2923 | /* Data is ready to be read by a viewer */ | |
6d805429 | 2924 | ret = 0; |
806e2684 DG |
2925 | |
2926 | error: | |
2927 | return ret; | |
2928 | } | |
2929 | ||
6dc3064a DG |
2930 | /* |
2931 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
2932 | * | |
2933 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
2934 | */ | |
2935 | int cmd_snapshot_add_output(struct ltt_session *session, | |
2936 | struct lttng_snapshot_output *output, uint32_t *id) | |
2937 | { | |
2938 | int ret; | |
2939 | struct snapshot_output *new_output; | |
2940 | ||
2941 | assert(session); | |
2942 | assert(output); | |
2943 | ||
2944 | DBG("Cmd snapshot add output for session %s", session->name); | |
2945 | ||
2946 | /* | |
d3f14b8a MD |
2947 | * Permission denied to create an output if the session is not |
2948 | * set in no output mode. | |
6dc3064a DG |
2949 | */ |
2950 | if (session->output_traces) { | |
2951 | ret = LTTNG_ERR_EPERM; | |
2952 | goto error; | |
2953 | } | |
2954 | ||
2955 | /* Only one output is allowed until we have the "tee" feature. */ | |
2956 | if (session->snapshot.nb_output == 1) { | |
2957 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
2958 | goto error; | |
2959 | } | |
2960 | ||
2961 | new_output = snapshot_output_alloc(); | |
2962 | if (!new_output) { | |
2963 | ret = LTTNG_ERR_NOMEM; | |
2964 | goto error; | |
2965 | } | |
2966 | ||
2967 | ret = snapshot_output_init(output->max_size, output->name, | |
2968 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
2969 | &session->snapshot); | |
2970 | if (ret < 0) { | |
2971 | if (ret == -ENOMEM) { | |
2972 | ret = LTTNG_ERR_NOMEM; | |
2973 | } else { | |
2974 | ret = LTTNG_ERR_INVALID; | |
2975 | } | |
2976 | goto free_error; | |
2977 | } | |
2978 | ||
6dc3064a DG |
2979 | rcu_read_lock(); |
2980 | snapshot_add_output(&session->snapshot, new_output); | |
2981 | if (id) { | |
2982 | *id = new_output->id; | |
2983 | } | |
2984 | rcu_read_unlock(); | |
2985 | ||
2986 | return LTTNG_OK; | |
2987 | ||
2988 | free_error: | |
2989 | snapshot_output_destroy(new_output); | |
2990 | error: | |
2991 | return ret; | |
2992 | } | |
2993 | ||
2994 | /* | |
2995 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
2996 | * | |
2997 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
2998 | */ | |
2999 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3000 | struct lttng_snapshot_output *output) | |
3001 | { | |
3002 | int ret; | |
eb240553 | 3003 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3004 | |
3005 | assert(session); | |
3006 | assert(output); | |
3007 | ||
6dc3064a DG |
3008 | rcu_read_lock(); |
3009 | ||
3010 | /* | |
d3f14b8a MD |
3011 | * Permission denied to create an output if the session is not |
3012 | * set in no output mode. | |
6dc3064a DG |
3013 | */ |
3014 | if (session->output_traces) { | |
3015 | ret = LTTNG_ERR_EPERM; | |
3016 | goto error; | |
3017 | } | |
3018 | ||
eb240553 DG |
3019 | if (output->id) { |
3020 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3021 | session->name); | |
3022 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3023 | } else if (*output->name != '\0') { | |
3024 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3025 | session->name); | |
3026 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3027 | } | |
6dc3064a DG |
3028 | if (!sout) { |
3029 | ret = LTTNG_ERR_INVALID; | |
3030 | goto error; | |
3031 | } | |
3032 | ||
3033 | snapshot_delete_output(&session->snapshot, sout); | |
3034 | snapshot_output_destroy(sout); | |
3035 | ret = LTTNG_OK; | |
3036 | ||
3037 | error: | |
3038 | rcu_read_unlock(); | |
3039 | return ret; | |
3040 | } | |
3041 | ||
3042 | /* | |
3043 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3044 | * | |
3045 | * If no output is available, outputs is untouched and 0 is returned. | |
3046 | * | |
3047 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3048 | */ | |
3049 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3050 | struct lttng_snapshot_output **outputs) | |
3051 | { | |
3052 | int ret, idx = 0; | |
b223ca94 | 3053 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3054 | struct lttng_ht_iter iter; |
3055 | struct snapshot_output *output; | |
3056 | ||
3057 | assert(session); | |
3058 | assert(outputs); | |
3059 | ||
3060 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3061 | ||
3062 | /* | |
d3f14b8a MD |
3063 | * Permission denied to create an output if the session is not |
3064 | * set in no output mode. | |
6dc3064a DG |
3065 | */ |
3066 | if (session->output_traces) { | |
b223ca94 | 3067 | ret = -LTTNG_ERR_EPERM; |
6dc3064a DG |
3068 | goto error; |
3069 | } | |
3070 | ||
3071 | if (session->snapshot.nb_output == 0) { | |
3072 | ret = 0; | |
3073 | goto error; | |
3074 | } | |
3075 | ||
3076 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3077 | if (!list) { | |
b223ca94 | 3078 | ret = -LTTNG_ERR_NOMEM; |
6dc3064a DG |
3079 | goto error; |
3080 | } | |
3081 | ||
3082 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3083 | rcu_read_lock(); |
6dc3064a DG |
3084 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3085 | output, node.node) { | |
3086 | assert(output->consumer); | |
3087 | list[idx].id = output->id; | |
3088 | list[idx].max_size = output->max_size; | |
3089 | strncpy(list[idx].name, output->name, sizeof(list[idx].name)); | |
3090 | if (output->consumer->type == CONSUMER_DST_LOCAL) { | |
3091 | strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path, | |
3092 | sizeof(list[idx].ctrl_url)); | |
3093 | } else { | |
3094 | /* Control URI. */ | |
3095 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3096 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3097 | if (ret < 0) { | |
b223ca94 JG |
3098 | ret = -LTTNG_ERR_NOMEM; |
3099 | goto error; | |
6dc3064a DG |
3100 | } |
3101 | ||
3102 | /* Data URI. */ | |
3103 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3104 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3105 | if (ret < 0) { | |
b223ca94 JG |
3106 | ret = -LTTNG_ERR_NOMEM; |
3107 | goto error; | |
6dc3064a DG |
3108 | } |
3109 | } | |
3110 | idx++; | |
3111 | } | |
3112 | ||
3113 | *outputs = list; | |
b223ca94 JG |
3114 | list = NULL; |
3115 | ret = session->snapshot.nb_output; | |
6dc3064a | 3116 | error: |
b223ca94 JG |
3117 | free(list); |
3118 | rcu_read_unlock(); | |
3119 | return ret; | |
6dc3064a DG |
3120 | } |
3121 | ||
3122 | /* | |
3123 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3124 | * snapshot output is *not* set with a remote destination. | |
3125 | * | |
a934f4af | 3126 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3127 | */ |
3128 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3129 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3130 | { | |
a934f4af | 3131 | int ret = LTTNG_OK; |
6dc3064a DG |
3132 | struct lttng_ht_iter iter; |
3133 | struct consumer_socket *socket; | |
3134 | ||
3135 | assert(consumer); | |
3136 | assert(snap_output); | |
3137 | assert(session); | |
3138 | ||
3139 | DBG2("Set relayd object from snapshot output"); | |
3140 | ||
3141 | /* Ignore if snapshot consumer output is not network. */ | |
3142 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3143 | goto error; | |
3144 | } | |
3145 | ||
3146 | /* | |
3147 | * For each consumer socket, create and send the relayd object of the | |
3148 | * snapshot output. | |
3149 | */ | |
3150 | rcu_read_lock(); | |
5eecee74 DG |
3151 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3152 | socket, node.node) { | |
6dc3064a | 3153 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3154 | snap_output->consumer, socket, |
3155 | session->name, session->hostname, | |
3156 | session->live_timer); | |
a934f4af | 3157 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3158 | rcu_read_unlock(); |
3159 | goto error; | |
3160 | } | |
3161 | } | |
3162 | rcu_read_unlock(); | |
3163 | ||
3164 | error: | |
3165 | return ret; | |
3166 | } | |
3167 | ||
3168 | /* | |
3169 | * Record a kernel snapshot. | |
3170 | * | |
fac41e72 | 3171 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3172 | */ |
3173 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3174 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3175 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3176 | { |
3177 | int ret; | |
3178 | ||
3179 | assert(ksess); | |
3180 | assert(output); | |
3181 | assert(session); | |
3182 | ||
10a50311 JD |
3183 | /* Get the datetime for the snapshot output directory. */ |
3184 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime, | |
3185 | sizeof(output->datetime)); | |
3186 | if (!ret) { | |
a934f4af | 3187 | ret = LTTNG_ERR_INVALID; |
10a50311 JD |
3188 | goto error; |
3189 | } | |
3190 | ||
af706bb7 DG |
3191 | /* |
3192 | * Copy kernel session sockets so we can communicate with the right | |
3193 | * consumer for the snapshot record command. | |
3194 | */ | |
3195 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3196 | if (ret < 0) { | |
a934f4af | 3197 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3198 | goto error; |
6dc3064a DG |
3199 | } |
3200 | ||
3201 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3202 | if (ret != LTTNG_OK) { |
af706bb7 | 3203 | goto error_snapshot; |
6dc3064a DG |
3204 | } |
3205 | ||
d07ceecd | 3206 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3207 | if (ret != LTTNG_OK) { |
af706bb7 | 3208 | goto error_snapshot; |
6dc3064a DG |
3209 | } |
3210 | ||
a934f4af | 3211 | ret = LTTNG_OK; |
1371fc12 | 3212 | goto end; |
a934f4af | 3213 | |
af706bb7 DG |
3214 | error_snapshot: |
3215 | /* Clean up copied sockets so this output can use some other later on. */ | |
3216 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3217 | error: |
1371fc12 | 3218 | end: |
6dc3064a DG |
3219 | return ret; |
3220 | } | |
3221 | ||
3222 | /* | |
3223 | * Record a UST snapshot. | |
3224 | * | |
a934f4af | 3225 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3226 | */ |
3227 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3228 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3229 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3230 | { |
3231 | int ret; | |
3232 | ||
3233 | assert(usess); | |
3234 | assert(output); | |
3235 | assert(session); | |
3236 | ||
10a50311 JD |
3237 | /* Get the datetime for the snapshot output directory. */ |
3238 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime, | |
3239 | sizeof(output->datetime)); | |
3240 | if (!ret) { | |
a934f4af | 3241 | ret = LTTNG_ERR_INVALID; |
10a50311 JD |
3242 | goto error; |
3243 | } | |
3244 | ||
af706bb7 | 3245 | /* |
d3f14b8a | 3246 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3247 | * consumer for the snapshot record command. |
3248 | */ | |
3249 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3250 | if (ret < 0) { | |
a934f4af | 3251 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3252 | goto error; |
6dc3064a DG |
3253 | } |
3254 | ||
3255 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3256 | if (ret != LTTNG_OK) { |
af706bb7 | 3257 | goto error_snapshot; |
6dc3064a DG |
3258 | } |
3259 | ||
d07ceecd | 3260 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3261 | if (ret < 0) { |
7badf927 DG |
3262 | switch (-ret) { |
3263 | case EINVAL: | |
a934f4af | 3264 | ret = LTTNG_ERR_INVALID; |
7badf927 DG |
3265 | break; |
3266 | case ENODATA: | |
3267 | ret = LTTNG_ERR_SNAPSHOT_NODATA; | |
3268 | break; | |
3269 | default: | |
3270 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3271 | break; | |
5c786ded | 3272 | } |
af706bb7 | 3273 | goto error_snapshot; |
6dc3064a DG |
3274 | } |
3275 | ||
a934f4af DG |
3276 | ret = LTTNG_OK; |
3277 | ||
af706bb7 DG |
3278 | error_snapshot: |
3279 | /* Clean up copied sockets so this output can use some other later on. */ | |
3280 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3281 | error: |
3282 | return ret; | |
3283 | } | |
3284 | ||
d07ceecd MD |
3285 | static |
3286 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3287 | uint64_t cur_nr_packets) | |
68808f4e | 3288 | { |
d07ceecd | 3289 | uint64_t tot_size = 0; |
68808f4e DG |
3290 | |
3291 | if (session->kernel_session) { | |
3292 | struct ltt_kernel_channel *chan; | |
3293 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3294 | ||
68808f4e | 3295 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3296 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3297 | /* | |
3298 | * Don't take channel into account if we | |
3299 | * already grab all its packets. | |
3300 | */ | |
3301 | continue; | |
68808f4e | 3302 | } |
d07ceecd MD |
3303 | tot_size += chan->channel->attr.subbuf_size |
3304 | * chan->stream_count; | |
68808f4e DG |
3305 | } |
3306 | } | |
3307 | ||
3308 | if (session->ust_session) { | |
68808f4e DG |
3309 | struct ltt_ust_session *usess = session->ust_session; |
3310 | ||
d07ceecd MD |
3311 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3312 | cur_nr_packets); | |
68808f4e DG |
3313 | } |
3314 | ||
d07ceecd | 3315 | return tot_size; |
68808f4e DG |
3316 | } |
3317 | ||
5c786ded | 3318 | /* |
d07ceecd MD |
3319 | * Calculate the number of packets we can grab from each stream that |
3320 | * fits within the overall snapshot max size. | |
3321 | * | |
3322 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3323 | * the number of packets per stream. | |
3324 | * | |
3325 | * TODO: this approach is not perfect: we consider the worse case | |
3326 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3327 | * better if we do this calculation while we actually grab the packet | |
3328 | * content: we would know how much padding we don't actually store into | |
3329 | * the file. | |
3330 | * | |
3331 | * This algorithm is currently bounded by the number of packets per | |
3332 | * stream. | |
3333 | * | |
3334 | * Since we call this algorithm before actually grabbing the data, it's | |
3335 | * an approximation: for instance, applications could appear/disappear | |
3336 | * in between this call and actually grabbing data. | |
5c786ded | 3337 | */ |
d07ceecd MD |
3338 | static |
3339 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3340 | { |
d07ceecd MD |
3341 | int64_t size_left; |
3342 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3343 | |
d07ceecd MD |
3344 | if (!max_size) { |
3345 | return 0; /* Infinite */ | |
5c786ded JD |
3346 | } |
3347 | ||
d07ceecd MD |
3348 | size_left = max_size; |
3349 | for (;;) { | |
3350 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3351 | |
d07ceecd MD |
3352 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3353 | cur_nb_packets); | |
3354 | if (!one_more_packet_tot_size) { | |
3355 | /* We are already grabbing all packets. */ | |
3356 | break; | |
3357 | } | |
3358 | size_left -= one_more_packet_tot_size; | |
3359 | if (size_left < 0) { | |
3360 | break; | |
3361 | } | |
3362 | cur_nb_packets++; | |
5c786ded | 3363 | } |
d07ceecd MD |
3364 | if (!cur_nb_packets) { |
3365 | /* Not enough room to grab one packet of each stream, error. */ | |
3366 | return -1; | |
3367 | } | |
3368 | return cur_nb_packets; | |
5c786ded JD |
3369 | } |
3370 | ||
6dc3064a DG |
3371 | /* |
3372 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3373 | * | |
3374 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3375 | * complete before returning. | |
3376 | * | |
3377 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3378 | */ | |
3379 | int cmd_snapshot_record(struct ltt_session *session, | |
3380 | struct lttng_snapshot_output *output, int wait) | |
3381 | { | |
3382 | int ret = LTTNG_OK; | |
e1986656 DG |
3383 | unsigned int use_tmp_output = 0; |
3384 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3385 | unsigned int snapshot_success = 0; |
6dc3064a DG |
3386 | |
3387 | assert(session); | |
ba45d9f0 | 3388 | assert(output); |
6dc3064a DG |
3389 | |
3390 | DBG("Cmd snapshot record for session %s", session->name); | |
3391 | ||
3392 | /* | |
d3f14b8a MD |
3393 | * Permission denied to create an output if the session is not |
3394 | * set in no output mode. | |
6dc3064a DG |
3395 | */ |
3396 | if (session->output_traces) { | |
3397 | ret = LTTNG_ERR_EPERM; | |
3398 | goto error; | |
3399 | } | |
3400 | ||
3401 | /* The session needs to be started at least once. */ | |
8382cf6f | 3402 | if (!session->has_been_started) { |
6dc3064a DG |
3403 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3404 | goto error; | |
3405 | } | |
3406 | ||
3407 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3408 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3409 | ret = snapshot_output_init(output->max_size, output->name, |
3410 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3411 | &tmp_output, NULL); |
6dc3064a DG |
3412 | if (ret < 0) { |
3413 | if (ret == -ENOMEM) { | |
3414 | ret = LTTNG_ERR_NOMEM; | |
3415 | } else { | |
3416 | ret = LTTNG_ERR_INVALID; | |
3417 | } | |
3418 | goto error; | |
3419 | } | |
1bfe7328 DG |
3420 | /* Use the global session count for the temporary snapshot. */ |
3421 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
e1986656 | 3422 | use_tmp_output = 1; |
6dc3064a DG |
3423 | } |
3424 | ||
3425 | if (session->kernel_session) { | |
3426 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3427 | ||
e1986656 | 3428 | if (use_tmp_output) { |
d07ceecd MD |
3429 | int64_t nb_packets_per_stream; |
3430 | ||
3431 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3432 | tmp_output.max_size); | |
3433 | if (nb_packets_per_stream < 0) { | |
3434 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3435 | goto error; | |
3436 | } | |
e1986656 | 3437 | ret = record_kernel_snapshot(ksess, &tmp_output, session, |
d07ceecd | 3438 | wait, nb_packets_per_stream); |
a934f4af | 3439 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3440 | goto error; |
3441 | } | |
1bfe7328 | 3442 | snapshot_success = 1; |
6dc3064a DG |
3443 | } else { |
3444 | struct snapshot_output *sout; | |
3445 | struct lttng_ht_iter iter; | |
3446 | ||
3447 | rcu_read_lock(); | |
3448 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3449 | &iter.iter, sout, node.node) { | |
d07ceecd MD |
3450 | int64_t nb_packets_per_stream; |
3451 | ||
e1986656 DG |
3452 | /* |
3453 | * Make a local copy of the output and assign the possible | |
3454 | * temporary value given by the caller. | |
3455 | */ | |
3456 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3457 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
3458 | ||
e1986656 DG |
3459 | if (output->max_size != (uint64_t) -1ULL) { |
3460 | tmp_output.max_size = output->max_size; | |
3461 | } | |
3462 | ||
d07ceecd MD |
3463 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3464 | tmp_output.max_size); | |
3465 | if (nb_packets_per_stream < 0) { | |
68808f4e DG |
3466 | ret = LTTNG_ERR_MAX_SIZE_INVALID; |
3467 | goto error; | |
3468 | } | |
3469 | ||
e1986656 DG |
3470 | /* Use temporary name. */ |
3471 | if (*output->name != '\0') { | |
3472 | strncpy(tmp_output.name, output->name, | |
3473 | sizeof(tmp_output.name)); | |
3474 | } | |
3475 | ||
1bfe7328 DG |
3476 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
3477 | ||
e1986656 | 3478 | ret = record_kernel_snapshot(ksess, &tmp_output, |
d07ceecd | 3479 | session, wait, nb_packets_per_stream); |
a934f4af | 3480 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3481 | rcu_read_unlock(); |
3482 | goto error; | |
3483 | } | |
1bfe7328 | 3484 | snapshot_success = 1; |
6dc3064a DG |
3485 | } |
3486 | rcu_read_unlock(); | |
3487 | } | |
3488 | } | |
3489 | ||
3490 | if (session->ust_session) { | |
3491 | struct ltt_ust_session *usess = session->ust_session; | |
3492 | ||
e1986656 | 3493 | if (use_tmp_output) { |
d07ceecd MD |
3494 | int64_t nb_packets_per_stream; |
3495 | ||
3496 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3497 | tmp_output.max_size); | |
3498 | if (nb_packets_per_stream < 0) { | |
3499 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3500 | goto error; | |
3501 | } | |
e1986656 | 3502 | ret = record_ust_snapshot(usess, &tmp_output, session, |
d07ceecd | 3503 | wait, nb_packets_per_stream); |
a934f4af | 3504 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3505 | goto error; |
3506 | } | |
1bfe7328 | 3507 | snapshot_success = 1; |
6dc3064a DG |
3508 | } else { |
3509 | struct snapshot_output *sout; | |
3510 | struct lttng_ht_iter iter; | |
3511 | ||
3512 | rcu_read_lock(); | |
3513 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3514 | &iter.iter, sout, node.node) { | |
d07ceecd MD |
3515 | int64_t nb_packets_per_stream; |
3516 | ||
e1986656 DG |
3517 | /* |
3518 | * Make a local copy of the output and assign the possible | |
3519 | * temporary value given by the caller. | |
3520 | */ | |
3521 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3522 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
3523 | ||
e1986656 DG |
3524 | if (output->max_size != (uint64_t) -1ULL) { |
3525 | tmp_output.max_size = output->max_size; | |
3526 | } | |
3527 | ||
d07ceecd MD |
3528 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3529 | tmp_output.max_size); | |
3530 | if (nb_packets_per_stream < 0) { | |
68808f4e | 3531 | ret = LTTNG_ERR_MAX_SIZE_INVALID; |
d07ceecd | 3532 | rcu_read_unlock(); |
68808f4e DG |
3533 | goto error; |
3534 | } | |
3535 | ||
e1986656 DG |
3536 | /* Use temporary name. */ |
3537 | if (*output->name != '\0') { | |
3538 | strncpy(tmp_output.name, output->name, | |
3539 | sizeof(tmp_output.name)); | |
3540 | } | |
3541 | ||
1bfe7328 DG |
3542 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
3543 | ||
e1986656 | 3544 | ret = record_ust_snapshot(usess, &tmp_output, session, |
d07ceecd | 3545 | wait, nb_packets_per_stream); |
a934f4af | 3546 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3547 | rcu_read_unlock(); |
3548 | goto error; | |
3549 | } | |
1bfe7328 | 3550 | snapshot_success = 1; |
6dc3064a DG |
3551 | } |
3552 | rcu_read_unlock(); | |
3553 | } | |
3554 | } | |
3555 | ||
1bfe7328 DG |
3556 | if (snapshot_success) { |
3557 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
3558 | } else { |
3559 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
3560 | } |
3561 | ||
6dc3064a | 3562 | error: |
6dc3064a DG |
3563 | return ret; |
3564 | } | |
3565 | ||
d7ba1388 MD |
3566 | /* |
3567 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
3568 | */ | |
3569 | int cmd_set_session_shm_path(struct ltt_session *session, | |
3570 | const char *shm_path) | |
3571 | { | |
3572 | /* Safety net */ | |
3573 | assert(session); | |
3574 | ||
3575 | /* | |
3576 | * Can only set shm path before session is started. | |
3577 | */ | |
3578 | if (session->has_been_started) { | |
3579 | return LTTNG_ERR_SESSION_STARTED; | |
3580 | } | |
3581 | ||
3582 | strncpy(session->shm_path, shm_path, | |
3583 | sizeof(session->shm_path)); | |
3584 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
3585 | ||
3586 | return 0; | |
3587 | } | |
3588 | ||
2f77fc4b DG |
3589 | /* |
3590 | * Init command subsystem. | |
3591 | */ | |
3592 | void cmd_init(void) | |
3593 | { | |
3594 | /* | |
d88aee68 DG |
3595 | * Set network sequence index to 1 for streams to match a relayd |
3596 | * socket on the consumer side. | |
2f77fc4b | 3597 | */ |
d88aee68 DG |
3598 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
3599 | relayd_net_seq_idx = 1; | |
3600 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
3601 | |
3602 | DBG("Command subsystem initialized"); | |
3603 | } |