Commit | Line | Data |
---|---|---|
2f77fc4b DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
6c1c0768 | 19 | #define _LGPL_SOURCE |
2f77fc4b | 20 | #include <assert.h> |
1f345e94 | 21 | #include <string.h> |
6dc3064a | 22 | #include <inttypes.h> |
2f77fc4b DG |
23 | #include <urcu/list.h> |
24 | #include <urcu/uatomic.h> | |
25 | ||
26 | #include <common/defaults.h> | |
27 | #include <common/common.h> | |
28 | #include <common/sessiond-comm/sessiond-comm.h> | |
29 | #include <common/relayd/relayd.h> | |
10a50311 | 30 | #include <common/utils.h> |
2f77fc4b DG |
31 | |
32 | #include "channel.h" | |
33 | #include "consumer.h" | |
34 | #include "event.h" | |
8782cc74 | 35 | #include "health-sessiond.h" |
2f77fc4b DG |
36 | #include "kernel.h" |
37 | #include "kernel-consumer.h" | |
38 | #include "lttng-sessiond.h" | |
39 | #include "utils.h" | |
834978fd | 40 | #include "syscall.h" |
2f77fc4b DG |
41 | |
42 | #include "cmd.h" | |
43 | ||
44 | /* | |
45 | * Used to keep a unique index for each relayd socket created where this value | |
46 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
47 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
48 | * held. | |
2f77fc4b | 49 | */ |
d88aee68 DG |
50 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
51 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 52 | |
1290b5d8 JG |
53 | static int validate_event_name(const char *); |
54 | static int validate_ust_event_name(const char *); | |
55 | static int cmd_enable_event_internal(struct ltt_session *session, | |
56 | struct lttng_domain *domain, | |
57 | char *channel_name, struct lttng_event *event, | |
58 | char *filter_expression, | |
59 | struct lttng_filter_bytecode *filter, | |
60 | struct lttng_event_exclusion *exclusion, | |
61 | int wpipe); | |
62 | ||
2f77fc4b DG |
63 | /* |
64 | * Create a session path used by list_lttng_sessions for the case that the | |
65 | * session consumer is on the network. | |
66 | */ | |
67 | static int build_network_session_path(char *dst, size_t size, | |
68 | struct ltt_session *session) | |
69 | { | |
70 | int ret, kdata_port, udata_port; | |
71 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
72 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
73 | ||
74 | assert(session); | |
75 | assert(dst); | |
76 | ||
77 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
78 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
79 | ||
80 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
81 | ||
82 | if (session->kernel_session && session->kernel_session->consumer) { | |
83 | kuri = &session->kernel_session->consumer->dst.net.control; | |
84 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
85 | } | |
86 | ||
87 | if (session->ust_session && session->ust_session->consumer) { | |
88 | uuri = &session->ust_session->consumer->dst.net.control; | |
89 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
90 | } | |
91 | ||
92 | if (uuri == NULL && kuri == NULL) { | |
93 | uri = &session->consumer->dst.net.control; | |
94 | kdata_port = session->consumer->dst.net.data.port; | |
95 | } else if (kuri && uuri) { | |
96 | ret = uri_compare(kuri, uuri); | |
97 | if (ret) { | |
98 | /* Not Equal */ | |
99 | uri = kuri; | |
100 | /* Build uuri URL string */ | |
101 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
102 | if (ret < 0) { | |
103 | goto error; | |
104 | } | |
105 | } else { | |
106 | uri = kuri; | |
107 | } | |
108 | } else if (kuri && uuri == NULL) { | |
109 | uri = kuri; | |
110 | } else if (uuri && kuri == NULL) { | |
111 | uri = uuri; | |
112 | } | |
113 | ||
114 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
115 | if (ret < 0) { | |
116 | goto error; | |
117 | } | |
118 | ||
9aa9f900 DG |
119 | /* |
120 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
121 | * to print. | |
122 | */ | |
9d035200 | 123 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
124 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
125 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
126 | } else { | |
9aa9f900 | 127 | int dport; |
bef08707 | 128 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
129 | dport = kdata_port; |
130 | } else { | |
131 | /* No kernel URI, use the UST port. */ | |
132 | dport = udata_port; | |
133 | } | |
134 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
135 | } |
136 | ||
137 | error: | |
138 | return ret; | |
139 | } | |
140 | ||
141 | /* | |
142 | * Fill lttng_channel array of all channels. | |
143 | */ | |
144 | static void list_lttng_channels(int domain, struct ltt_session *session, | |
145 | struct lttng_channel *channels) | |
146 | { | |
147 | int i = 0; | |
148 | struct ltt_kernel_channel *kchan; | |
149 | ||
150 | DBG("Listing channels for session %s", session->name); | |
151 | ||
152 | switch (domain) { | |
153 | case LTTNG_DOMAIN_KERNEL: | |
154 | /* Kernel channels */ | |
155 | if (session->kernel_session != NULL) { | |
156 | cds_list_for_each_entry(kchan, | |
157 | &session->kernel_session->channel_list.head, list) { | |
158 | /* Copy lttng_channel struct to array */ | |
159 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
160 | channels[i].enabled = kchan->enabled; | |
161 | i++; | |
162 | } | |
163 | } | |
164 | break; | |
165 | case LTTNG_DOMAIN_UST: | |
166 | { | |
167 | struct lttng_ht_iter iter; | |
168 | struct ltt_ust_channel *uchan; | |
169 | ||
e7fe706f | 170 | rcu_read_lock(); |
2f77fc4b DG |
171 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
172 | &iter.iter, uchan, node.node) { | |
74c0a111 MD |
173 | if (lttng_strncpy(channels[i].name, uchan->name, |
174 | LTTNG_SYMBOL_NAME_LEN)) { | |
175 | break; | |
176 | } | |
2f77fc4b DG |
177 | channels[i].attr.overwrite = uchan->attr.overwrite; |
178 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
179 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
180 | channels[i].attr.switch_timer_interval = | |
181 | uchan->attr.switch_timer_interval; | |
182 | channels[i].attr.read_timer_interval = | |
183 | uchan->attr.read_timer_interval; | |
184 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
185 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
186 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
2f77fc4b DG |
187 | switch (uchan->attr.output) { |
188 | case LTTNG_UST_MMAP: | |
189 | default: | |
190 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
191 | break; | |
192 | } | |
193 | i++; | |
194 | } | |
e7fe706f | 195 | rcu_read_unlock(); |
2f77fc4b DG |
196 | break; |
197 | } | |
198 | default: | |
199 | break; | |
200 | } | |
201 | } | |
202 | ||
3c6a091f | 203 | /* |
022d91ba | 204 | * Create a list of agent domain events. |
3c6a091f DG |
205 | * |
206 | * Return number of events in list on success or else a negative value. | |
207 | */ | |
022d91ba | 208 | static int list_lttng_agent_events(struct agent *agt, |
3c6a091f DG |
209 | struct lttng_event **events) |
210 | { | |
211 | int i = 0, ret = 0; | |
212 | unsigned int nb_event = 0; | |
022d91ba | 213 | struct agent_event *event; |
3c6a091f DG |
214 | struct lttng_event *tmp_events; |
215 | struct lttng_ht_iter iter; | |
216 | ||
022d91ba | 217 | assert(agt); |
3c6a091f DG |
218 | assert(events); |
219 | ||
022d91ba | 220 | DBG3("Listing agent events"); |
3c6a091f | 221 | |
e5bbf678 | 222 | rcu_read_lock(); |
022d91ba | 223 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 224 | rcu_read_unlock(); |
3c6a091f DG |
225 | if (nb_event == 0) { |
226 | ret = nb_event; | |
227 | goto error; | |
228 | } | |
229 | ||
230 | tmp_events = zmalloc(nb_event * sizeof(*tmp_events)); | |
231 | if (!tmp_events) { | |
022d91ba | 232 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
233 | ret = -LTTNG_ERR_FATAL; |
234 | goto error; | |
235 | } | |
236 | ||
237 | rcu_read_lock(); | |
022d91ba | 238 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
239 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
240 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
241 | tmp_events[i].enabled = event->enabled; | |
79a065a0 | 242 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 243 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f DG |
244 | i++; |
245 | } | |
246 | rcu_read_unlock(); | |
247 | ||
248 | *events = tmp_events; | |
249 | ret = nb_event; | |
250 | ||
251 | error: | |
252 | assert(nb_event == i); | |
253 | return ret; | |
254 | } | |
255 | ||
2f77fc4b DG |
256 | /* |
257 | * Create a list of ust global domain events. | |
258 | */ | |
259 | static int list_lttng_ust_global_events(char *channel_name, | |
260 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
261 | { | |
262 | int i = 0, ret = 0; | |
263 | unsigned int nb_event = 0; | |
264 | struct lttng_ht_iter iter; | |
265 | struct lttng_ht_node_str *node; | |
266 | struct ltt_ust_channel *uchan; | |
267 | struct ltt_ust_event *uevent; | |
268 | struct lttng_event *tmp; | |
269 | ||
270 | DBG("Listing UST global events for channel %s", channel_name); | |
271 | ||
272 | rcu_read_lock(); | |
273 | ||
274 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
275 | node = lttng_ht_iter_get_node_str(&iter); | |
276 | if (node == NULL) { | |
f73fabfd | 277 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
278 | goto error; |
279 | } | |
280 | ||
281 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
282 | ||
8040687e | 283 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
284 | if (nb_event == 0) { |
285 | ret = nb_event; | |
286 | goto error; | |
287 | } | |
288 | ||
289 | DBG3("Listing UST global %d events", nb_event); | |
290 | ||
291 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
292 | if (tmp == NULL) { | |
f73fabfd | 293 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
294 | goto error; |
295 | } | |
296 | ||
297 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
8040687e JG |
298 | if (uevent->internal) { |
299 | /* This event should remain hidden from clients */ | |
300 | nb_event--; | |
301 | continue; | |
302 | } | |
2f77fc4b DG |
303 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
304 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
305 | tmp[i].enabled = uevent->enabled; | |
306 | ||
307 | switch (uevent->attr.instrumentation) { | |
308 | case LTTNG_UST_TRACEPOINT: | |
309 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
310 | break; | |
311 | case LTTNG_UST_PROBE: | |
312 | tmp[i].type = LTTNG_EVENT_PROBE; | |
313 | break; | |
314 | case LTTNG_UST_FUNCTION: | |
315 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
316 | break; | |
317 | } | |
318 | ||
319 | tmp[i].loglevel = uevent->attr.loglevel; | |
320 | switch (uevent->attr.loglevel_type) { | |
321 | case LTTNG_UST_LOGLEVEL_ALL: | |
322 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
323 | break; | |
324 | case LTTNG_UST_LOGLEVEL_RANGE: | |
325 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
326 | break; | |
327 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
328 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
329 | break; | |
330 | } | |
331 | if (uevent->filter) { | |
332 | tmp[i].filter = 1; | |
333 | } | |
4634f12e JI |
334 | if (uevent->exclusion) { |
335 | tmp[i].exclusion = 1; | |
336 | } | |
2f77fc4b DG |
337 | i++; |
338 | } | |
339 | ||
340 | ret = nb_event; | |
341 | *events = tmp; | |
342 | ||
343 | error: | |
344 | rcu_read_unlock(); | |
345 | return ret; | |
346 | } | |
347 | ||
348 | /* | |
349 | * Fill lttng_event array of all kernel events in the channel. | |
350 | */ | |
351 | static int list_lttng_kernel_events(char *channel_name, | |
352 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
353 | { | |
354 | int i = 0, ret; | |
355 | unsigned int nb_event; | |
356 | struct ltt_kernel_event *event; | |
357 | struct ltt_kernel_channel *kchan; | |
358 | ||
359 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
360 | if (kchan == NULL) { | |
f73fabfd | 361 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
362 | goto error; |
363 | } | |
364 | ||
365 | nb_event = kchan->event_count; | |
366 | ||
367 | DBG("Listing events for channel %s", kchan->channel->name); | |
368 | ||
369 | if (nb_event == 0) { | |
834978fd | 370 | *events = NULL; |
9ac243ac | 371 | goto end; |
2f77fc4b DG |
372 | } |
373 | ||
374 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
375 | if (*events == NULL) { | |
f73fabfd | 376 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
377 | goto error; |
378 | } | |
379 | ||
380 | /* Kernel channels */ | |
381 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
382 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
383 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
384 | (*events)[i].enabled = event->enabled; | |
1d515f95 JG |
385 | (*events)[i].filter = |
386 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
387 | |
388 | switch (event->event->instrumentation) { | |
389 | case LTTNG_KERNEL_TRACEPOINT: | |
390 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
391 | break; | |
2f77fc4b | 392 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
393 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
394 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
395 | sizeof(struct lttng_kernel_kprobe)); | |
396 | break; | |
397 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
398 | (*events)[i].type = LTTNG_EVENT_PROBE; |
399 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
400 | sizeof(struct lttng_kernel_kprobe)); | |
401 | break; | |
402 | case LTTNG_KERNEL_FUNCTION: | |
403 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
404 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
405 | sizeof(struct lttng_kernel_function)); | |
406 | break; | |
407 | case LTTNG_KERNEL_NOOP: | |
408 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
409 | break; | |
410 | case LTTNG_KERNEL_SYSCALL: | |
411 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
412 | break; | |
413 | case LTTNG_KERNEL_ALL: | |
414 | assert(0); | |
415 | break; | |
416 | } | |
417 | i++; | |
418 | } | |
419 | ||
9ac243ac | 420 | end: |
2f77fc4b DG |
421 | return nb_event; |
422 | ||
423 | error: | |
f73fabfd DG |
424 | /* Negate the error code to differentiate the size from an error */ |
425 | return -ret; | |
2f77fc4b DG |
426 | } |
427 | ||
428 | /* | |
429 | * Add URI so the consumer output object. Set the correct path depending on the | |
430 | * domain adding the default trace directory. | |
431 | */ | |
432 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
433 | struct lttng_uri *uri, int domain, const char *session_name) | |
434 | { | |
f73fabfd | 435 | int ret = LTTNG_OK; |
2f77fc4b DG |
436 | const char *default_trace_dir; |
437 | ||
438 | assert(uri); | |
439 | ||
440 | if (consumer == NULL) { | |
441 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 442 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
443 | goto error; |
444 | } | |
445 | ||
446 | switch (domain) { | |
447 | case LTTNG_DOMAIN_KERNEL: | |
448 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
449 | break; | |
450 | case LTTNG_DOMAIN_UST: | |
451 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
452 | break; | |
453 | default: | |
454 | /* | |
455 | * This case is possible is we try to add the URI to the global tracing | |
456 | * session consumer object which in this case there is no subdir. | |
457 | */ | |
458 | default_trace_dir = ""; | |
459 | } | |
460 | ||
461 | switch (uri->dtype) { | |
462 | case LTTNG_DST_IPV4: | |
463 | case LTTNG_DST_IPV6: | |
464 | DBG2("Setting network URI to consumer"); | |
465 | ||
df75acac DG |
466 | if (consumer->type == CONSUMER_DST_NET) { |
467 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
468 | consumer->dst.net.control_isset) || |
469 | (uri->stype == LTTNG_STREAM_DATA && | |
470 | consumer->dst.net.data_isset)) { | |
df75acac DG |
471 | ret = LTTNG_ERR_URL_EXIST; |
472 | goto error; | |
473 | } | |
474 | } else { | |
475 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
476 | } |
477 | ||
df75acac DG |
478 | consumer->type = CONSUMER_DST_NET; |
479 | ||
2f77fc4b DG |
480 | /* Set URI into consumer output object */ |
481 | ret = consumer_set_network_uri(consumer, uri); | |
482 | if (ret < 0) { | |
a74934ba | 483 | ret = -ret; |
2f77fc4b DG |
484 | goto error; |
485 | } else if (ret == 1) { | |
486 | /* | |
487 | * URI was the same in the consumer so we do not append the subdir | |
488 | * again so to not duplicate output dir. | |
489 | */ | |
f86c9f4e | 490 | ret = LTTNG_OK; |
2f77fc4b DG |
491 | goto error; |
492 | } | |
493 | ||
494 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
495 | ret = consumer_set_subdir(consumer, session_name); | |
496 | if (ret < 0) { | |
f73fabfd | 497 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
498 | goto error; |
499 | } | |
500 | } | |
501 | ||
502 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
503 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
504 | strncat(consumer->subdir, default_trace_dir, |
505 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
506 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
507 | } | |
508 | ||
509 | break; | |
510 | case LTTNG_DST_PATH: | |
511 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
512 | memset(consumer->dst.trace_path, 0, | |
513 | sizeof(consumer->dst.trace_path)); | |
e9dd9196 MD |
514 | /* Explicit length checks for strcpy and strcat. */ |
515 | if (strlen(uri->dst.path) + strlen(default_trace_dir) | |
516 | >= sizeof(consumer->dst.trace_path)) { | |
517 | ret = LTTNG_ERR_FATAL; | |
518 | goto error; | |
519 | } | |
520 | strcpy(consumer->dst.trace_path, uri->dst.path); | |
2f77fc4b | 521 | /* Append default trace dir */ |
e9dd9196 | 522 | strcat(consumer->dst.trace_path, default_trace_dir); |
2f77fc4b DG |
523 | /* Flag consumer as local. */ |
524 | consumer->type = CONSUMER_DST_LOCAL; | |
525 | break; | |
526 | } | |
527 | ||
a74934ba DG |
528 | ret = LTTNG_OK; |
529 | ||
2f77fc4b DG |
530 | error: |
531 | return ret; | |
532 | } | |
533 | ||
534 | /* | |
535 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
536 | */ | |
537 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
538 | { | |
539 | int ret = 0; | |
540 | struct lttng_ht_iter iter; | |
541 | struct consumer_socket *socket; | |
542 | ||
543 | assert(session); | |
544 | ||
e7fe706f DG |
545 | rcu_read_lock(); |
546 | ||
2f77fc4b DG |
547 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
548 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
549 | socket, node.node) { | |
2f77fc4b | 550 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 551 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
552 | pthread_mutex_unlock(socket->lock); |
553 | if (ret < 0) { | |
f73fabfd | 554 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
555 | goto error; |
556 | } | |
557 | } | |
558 | } | |
559 | ||
560 | error: | |
e7fe706f | 561 | rcu_read_unlock(); |
2f77fc4b DG |
562 | return ret; |
563 | } | |
564 | ||
565 | /* | |
566 | * Create a socket to the relayd using the URI. | |
567 | * | |
568 | * On success, the relayd_sock pointer is set to the created socket. | |
569 | * Else, it's stays untouched and a lttcomm error code is returned. | |
570 | */ | |
6151a90f JD |
571 | static int create_connect_relayd(struct lttng_uri *uri, |
572 | struct lttcomm_relayd_sock **relayd_sock) | |
2f77fc4b DG |
573 | { |
574 | int ret; | |
6151a90f | 575 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 576 | |
6151a90f JD |
577 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
578 | RELAYD_VERSION_COMM_MINOR); | |
579 | if (!rsock) { | |
f73fabfd | 580 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
581 | goto error; |
582 | } | |
583 | ||
ffe60014 DG |
584 | /* |
585 | * Connect to relayd so we can proceed with a session creation. This call | |
586 | * can possibly block for an arbitrary amount of time to set the health | |
587 | * state to be in poll execution. | |
588 | */ | |
589 | health_poll_entry(); | |
6151a90f | 590 | ret = relayd_connect(rsock); |
ffe60014 | 591 | health_poll_exit(); |
2f77fc4b DG |
592 | if (ret < 0) { |
593 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 594 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
595 | goto free_sock; |
596 | } | |
597 | ||
598 | /* Create socket for control stream. */ | |
599 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
600 | DBG3("Creating relayd stream socket from URI"); | |
601 | ||
602 | /* Check relayd version */ | |
6151a90f | 603 | ret = relayd_version_check(rsock); |
2f77fc4b | 604 | if (ret < 0) { |
f73fabfd | 605 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
606 | goto close_sock; |
607 | } | |
608 | } else if (uri->stype == LTTNG_STREAM_DATA) { | |
609 | DBG3("Creating relayd data socket from URI"); | |
610 | } else { | |
611 | /* Command is not valid */ | |
612 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 613 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
614 | goto close_sock; |
615 | } | |
616 | ||
6151a90f | 617 | *relayd_sock = rsock; |
2f77fc4b | 618 | |
f73fabfd | 619 | return LTTNG_OK; |
2f77fc4b DG |
620 | |
621 | close_sock: | |
6151a90f JD |
622 | /* The returned value is not useful since we are on an error path. */ |
623 | (void) relayd_close(rsock); | |
2f77fc4b | 624 | free_sock: |
6151a90f | 625 | free(rsock); |
2f77fc4b DG |
626 | error: |
627 | return ret; | |
628 | } | |
629 | ||
630 | /* | |
631 | * Connect to the relayd using URI and send the socket to the right consumer. | |
632 | */ | |
6dc3064a | 633 | static int send_consumer_relayd_socket(int domain, unsigned int session_id, |
2f77fc4b | 634 | struct lttng_uri *relayd_uri, struct consumer_output *consumer, |
d3e2ba59 JD |
635 | struct consumer_socket *consumer_sock, |
636 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
637 | { |
638 | int ret; | |
6151a90f | 639 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 640 | |
ffe60014 | 641 | /* Connect to relayd and make version check if uri is the control. */ |
6151a90f | 642 | ret = create_connect_relayd(relayd_uri, &rsock); |
ffe60014 | 643 | if (ret != LTTNG_OK) { |
6151a90f | 644 | goto error; |
ffe60014 | 645 | } |
6151a90f | 646 | assert(rsock); |
ffe60014 | 647 | |
2f77fc4b | 648 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
649 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
650 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
651 | /* |
652 | * Increment net_seq_idx because we are about to transfer the | |
653 | * new relayd socket to the consumer. | |
d88aee68 | 654 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 655 | */ |
d88aee68 DG |
656 | consumer->net_seq_index = ++relayd_net_seq_idx; |
657 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
658 | } |
659 | ||
2f77fc4b | 660 | /* Send relayd socket to consumer. */ |
6151a90f | 661 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
662 | relayd_uri->stype, session_id, |
663 | session_name, hostname, session_live_timer); | |
2f77fc4b | 664 | if (ret < 0) { |
f73fabfd | 665 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
666 | goto close_sock; |
667 | } | |
668 | ||
c890b720 DG |
669 | /* Flag that the corresponding socket was sent. */ |
670 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 671 | consumer_sock->control_sock_sent = 1; |
c890b720 | 672 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 673 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
674 | } |
675 | ||
f73fabfd | 676 | ret = LTTNG_OK; |
2f77fc4b DG |
677 | |
678 | /* | |
679 | * Close socket which was dup on the consumer side. The session daemon does | |
680 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
681 | */ | |
682 | ||
683 | close_sock: | |
6151a90f JD |
684 | (void) relayd_close(rsock); |
685 | free(rsock); | |
2f77fc4b | 686 | |
6151a90f | 687 | error: |
ffe60014 DG |
688 | if (ret != LTTNG_OK) { |
689 | /* | |
d9078d0c DG |
690 | * The consumer output for this session should not be used anymore |
691 | * since the relayd connection failed thus making any tracing or/and | |
692 | * streaming not usable. | |
ffe60014 | 693 | */ |
d9078d0c | 694 | consumer->enabled = 0; |
ffe60014 | 695 | } |
2f77fc4b DG |
696 | return ret; |
697 | } | |
698 | ||
699 | /* | |
700 | * Send both relayd sockets to a specific consumer and domain. This is a | |
701 | * helper function to facilitate sending the information to the consumer for a | |
702 | * session. | |
703 | */ | |
6dc3064a | 704 | static int send_consumer_relayd_sockets(int domain, unsigned int session_id, |
d3e2ba59 JD |
705 | struct consumer_output *consumer, struct consumer_socket *sock, |
706 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b | 707 | { |
dda67f6c | 708 | int ret = LTTNG_OK; |
2f77fc4b | 709 | |
2f77fc4b | 710 | assert(consumer); |
6dc3064a | 711 | assert(sock); |
2f77fc4b | 712 | |
2f77fc4b | 713 | /* Sending control relayd socket. */ |
ffe60014 | 714 | if (!sock->control_sock_sent) { |
6dc3064a | 715 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
716 | &consumer->dst.net.control, consumer, sock, |
717 | session_name, hostname, session_live_timer); | |
c890b720 DG |
718 | if (ret != LTTNG_OK) { |
719 | goto error; | |
720 | } | |
2f77fc4b DG |
721 | } |
722 | ||
723 | /* Sending data relayd socket. */ | |
ffe60014 | 724 | if (!sock->data_sock_sent) { |
6dc3064a | 725 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
726 | &consumer->dst.net.data, consumer, sock, |
727 | session_name, hostname, session_live_timer); | |
c890b720 DG |
728 | if (ret != LTTNG_OK) { |
729 | goto error; | |
730 | } | |
2f77fc4b DG |
731 | } |
732 | ||
2f77fc4b DG |
733 | error: |
734 | return ret; | |
735 | } | |
736 | ||
737 | /* | |
738 | * Setup relayd connections for a tracing session. First creates the socket to | |
739 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
740 | * network. | |
741 | */ | |
ffe60014 | 742 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 743 | { |
f73fabfd | 744 | int ret = LTTNG_OK; |
2f77fc4b DG |
745 | struct ltt_ust_session *usess; |
746 | struct ltt_kernel_session *ksess; | |
747 | struct consumer_socket *socket; | |
748 | struct lttng_ht_iter iter; | |
749 | ||
750 | assert(session); | |
751 | ||
752 | usess = session->ust_session; | |
753 | ksess = session->kernel_session; | |
754 | ||
785d2d0d | 755 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 756 | |
e7fe706f DG |
757 | rcu_read_lock(); |
758 | ||
2f77fc4b DG |
759 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
760 | && usess->consumer->enabled) { | |
761 | /* For each consumer socket, send relayd sockets */ | |
762 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
763 | socket, node.node) { | |
2f77fc4b | 764 | pthread_mutex_lock(socket->lock); |
6dc3064a | 765 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
766 | usess->consumer, socket, |
767 | session->name, session->hostname, | |
768 | session->live_timer); | |
2f77fc4b | 769 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 770 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
771 | goto error; |
772 | } | |
6dc3064a DG |
773 | /* Session is now ready for network streaming. */ |
774 | session->net_handle = 1; | |
2f77fc4b DG |
775 | } |
776 | } | |
777 | ||
778 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
779 | && ksess->consumer->enabled) { | |
780 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
781 | socket, node.node) { | |
2f77fc4b | 782 | pthread_mutex_lock(socket->lock); |
6dc3064a | 783 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
784 | ksess->consumer, socket, |
785 | session->name, session->hostname, | |
786 | session->live_timer); | |
2f77fc4b | 787 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 788 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
789 | goto error; |
790 | } | |
6dc3064a DG |
791 | /* Session is now ready for network streaming. */ |
792 | session->net_handle = 1; | |
2f77fc4b DG |
793 | } |
794 | } | |
795 | ||
796 | error: | |
e7fe706f | 797 | rcu_read_unlock(); |
2f77fc4b DG |
798 | return ret; |
799 | } | |
800 | ||
9b6c7ec5 DG |
801 | /* |
802 | * Start a kernel session by opening all necessary streams. | |
803 | */ | |
804 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
805 | { | |
806 | int ret; | |
807 | struct ltt_kernel_channel *kchan; | |
808 | ||
809 | /* Open kernel metadata */ | |
07b86b52 | 810 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
811 | ret = kernel_open_metadata(ksess); |
812 | if (ret < 0) { | |
813 | ret = LTTNG_ERR_KERN_META_FAIL; | |
814 | goto error; | |
815 | } | |
816 | } | |
817 | ||
818 | /* Open kernel metadata stream */ | |
07b86b52 | 819 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
820 | ret = kernel_open_metadata_stream(ksess); |
821 | if (ret < 0) { | |
822 | ERR("Kernel create metadata stream failed"); | |
823 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
824 | goto error; | |
825 | } | |
826 | } | |
827 | ||
828 | /* For each channel */ | |
829 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
830 | if (kchan->stream_count == 0) { | |
831 | ret = kernel_open_channel_stream(kchan); | |
832 | if (ret < 0) { | |
833 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
834 | goto error; | |
835 | } | |
836 | /* Update the stream global counter */ | |
837 | ksess->stream_count_global += ret; | |
838 | } | |
839 | } | |
840 | ||
841 | /* Setup kernel consumer socket and send fds to it */ | |
842 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 843 | if (ret != 0) { |
9b6c7ec5 DG |
844 | ret = LTTNG_ERR_KERN_START_FAIL; |
845 | goto error; | |
846 | } | |
847 | ||
848 | /* This start the kernel tracing */ | |
849 | ret = kernel_start_session(ksess); | |
850 | if (ret < 0) { | |
851 | ret = LTTNG_ERR_KERN_START_FAIL; | |
852 | goto error; | |
853 | } | |
854 | ||
855 | /* Quiescent wait after starting trace */ | |
784303b0 | 856 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 | 857 | |
14fb1ebe | 858 | ksess->active = 1; |
9b6c7ec5 DG |
859 | |
860 | ret = LTTNG_OK; | |
861 | ||
862 | error: | |
863 | return ret; | |
864 | } | |
865 | ||
2f77fc4b DG |
866 | /* |
867 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
868 | */ | |
869 | int cmd_disable_channel(struct ltt_session *session, int domain, | |
870 | char *channel_name) | |
871 | { | |
872 | int ret; | |
873 | struct ltt_ust_session *usess; | |
874 | ||
875 | usess = session->ust_session; | |
876 | ||
2223c96f DG |
877 | rcu_read_lock(); |
878 | ||
2f77fc4b DG |
879 | switch (domain) { |
880 | case LTTNG_DOMAIN_KERNEL: | |
881 | { | |
882 | ret = channel_kernel_disable(session->kernel_session, | |
883 | channel_name); | |
f73fabfd | 884 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
885 | goto error; |
886 | } | |
887 | ||
888 | kernel_wait_quiescent(kernel_tracer_fd); | |
889 | break; | |
890 | } | |
891 | case LTTNG_DOMAIN_UST: | |
892 | { | |
893 | struct ltt_ust_channel *uchan; | |
894 | struct lttng_ht *chan_ht; | |
895 | ||
896 | chan_ht = usess->domain_global.channels; | |
897 | ||
898 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
899 | if (uchan == NULL) { | |
f73fabfd | 900 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
901 | goto error; |
902 | } | |
903 | ||
7972aab2 | 904 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 905 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
906 | goto error; |
907 | } | |
908 | break; | |
909 | } | |
2f77fc4b | 910 | default: |
f73fabfd | 911 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
912 | goto error; |
913 | } | |
914 | ||
f73fabfd | 915 | ret = LTTNG_OK; |
2f77fc4b DG |
916 | |
917 | error: | |
2223c96f | 918 | rcu_read_unlock(); |
2f77fc4b DG |
919 | return ret; |
920 | } | |
921 | ||
ccf10263 MD |
922 | /* |
923 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
924 | * |
925 | * Called with session lock held. | |
ccf10263 MD |
926 | */ |
927 | int cmd_track_pid(struct ltt_session *session, int domain, int pid) | |
928 | { | |
929 | int ret; | |
930 | ||
931 | rcu_read_lock(); | |
932 | ||
933 | switch (domain) { | |
934 | case LTTNG_DOMAIN_KERNEL: | |
935 | { | |
936 | struct ltt_kernel_session *ksess; | |
937 | ||
938 | ksess = session->kernel_session; | |
939 | ||
940 | ret = kernel_track_pid(ksess, pid); | |
941 | if (ret != LTTNG_OK) { | |
942 | goto error; | |
943 | } | |
944 | ||
945 | kernel_wait_quiescent(kernel_tracer_fd); | |
946 | break; | |
947 | } | |
ccf10263 | 948 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
949 | { |
950 | struct ltt_ust_session *usess; | |
951 | ||
952 | usess = session->ust_session; | |
953 | ||
954 | ret = trace_ust_track_pid(usess, pid); | |
955 | if (ret != LTTNG_OK) { | |
956 | goto error; | |
957 | } | |
958 | break; | |
959 | } | |
ccf10263 MD |
960 | default: |
961 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
962 | goto error; | |
963 | } | |
964 | ||
965 | ret = LTTNG_OK; | |
966 | ||
967 | error: | |
968 | rcu_read_unlock(); | |
969 | return ret; | |
970 | } | |
971 | ||
972 | /* | |
973 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
974 | * |
975 | * Called with session lock held. | |
ccf10263 MD |
976 | */ |
977 | int cmd_untrack_pid(struct ltt_session *session, int domain, int pid) | |
978 | { | |
979 | int ret; | |
980 | ||
981 | rcu_read_lock(); | |
982 | ||
983 | switch (domain) { | |
984 | case LTTNG_DOMAIN_KERNEL: | |
985 | { | |
986 | struct ltt_kernel_session *ksess; | |
987 | ||
988 | ksess = session->kernel_session; | |
989 | ||
990 | ret = kernel_untrack_pid(ksess, pid); | |
991 | if (ret != LTTNG_OK) { | |
992 | goto error; | |
993 | } | |
994 | ||
995 | kernel_wait_quiescent(kernel_tracer_fd); | |
996 | break; | |
997 | } | |
ccf10263 | 998 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
999 | { |
1000 | struct ltt_ust_session *usess; | |
1001 | ||
1002 | usess = session->ust_session; | |
1003 | ||
1004 | ret = trace_ust_untrack_pid(usess, pid); | |
1005 | if (ret != LTTNG_OK) { | |
1006 | goto error; | |
1007 | } | |
1008 | break; | |
1009 | } | |
ccf10263 MD |
1010 | default: |
1011 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1012 | goto error; | |
1013 | } | |
1014 | ||
1015 | ret = LTTNG_OK; | |
1016 | ||
1017 | error: | |
1018 | rcu_read_unlock(); | |
1019 | return ret; | |
1020 | } | |
1021 | ||
2f77fc4b DG |
1022 | /* |
1023 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1024 | * | |
1025 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1026 | */ | |
1027 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1028 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1029 | { |
1030 | int ret; | |
1031 | struct ltt_ust_session *usess = session->ust_session; | |
1032 | struct lttng_ht *chan_ht; | |
1f345e94 | 1033 | size_t len; |
2f77fc4b DG |
1034 | |
1035 | assert(session); | |
1036 | assert(attr); | |
7972aab2 | 1037 | assert(domain); |
2f77fc4b | 1038 | |
1f345e94 PP |
1039 | len = strnlen(attr->name, sizeof(attr->name)); |
1040 | ||
1041 | /* Validate channel name */ | |
1042 | if (attr->name[0] == '.' || | |
1043 | memchr(attr->name, '/', len) != NULL) { | |
1044 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1045 | goto end; | |
1046 | } | |
1047 | ||
2f77fc4b DG |
1048 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1049 | ||
03b4fdcf DG |
1050 | rcu_read_lock(); |
1051 | ||
ecc48a90 JD |
1052 | /* |
1053 | * Don't try to enable a channel if the session has been started at | |
1054 | * some point in time before. The tracer does not allow it. | |
1055 | */ | |
8382cf6f | 1056 | if (session->has_been_started) { |
ecc48a90 JD |
1057 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1058 | goto error; | |
1059 | } | |
1060 | ||
1061 | /* | |
1062 | * If the session is a live session, remove the switch timer, the | |
1063 | * live timer does the same thing but sends also synchronisation | |
1064 | * beacons for inactive streams. | |
1065 | */ | |
1066 | if (session->live_timer > 0) { | |
1067 | attr->attr.live_timer_interval = session->live_timer; | |
1068 | attr->attr.switch_timer_interval = 0; | |
1069 | } | |
1070 | ||
7972aab2 | 1071 | switch (domain->type) { |
2f77fc4b DG |
1072 | case LTTNG_DOMAIN_KERNEL: |
1073 | { | |
1074 | struct ltt_kernel_channel *kchan; | |
1075 | ||
2f77fc4b DG |
1076 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1077 | session->kernel_session); | |
1078 | if (kchan == NULL) { | |
1079 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1080 | if (attr->name[0] != '\0') { |
1081 | session->kernel_session->has_non_default_channel = 1; | |
1082 | } | |
2f77fc4b DG |
1083 | } else { |
1084 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1085 | } | |
1086 | ||
f73fabfd | 1087 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1088 | goto error; |
1089 | } | |
1090 | ||
784303b0 | 1091 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1092 | break; |
1093 | } | |
1094 | case LTTNG_DOMAIN_UST: | |
ab24e525 JG |
1095 | case LTTNG_DOMAIN_JUL: |
1096 | case LTTNG_DOMAIN_LOG4J: | |
1097 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1098 | { |
1099 | struct ltt_ust_channel *uchan; | |
1100 | ||
ab24e525 JG |
1101 | /* |
1102 | * FIXME | |
1103 | * | |
1104 | * Current agent implementation limitations force us to allow | |
1105 | * only one channel at once in "agent" subdomains. Each | |
1106 | * subdomain has a default channel name which must be strictly | |
1107 | * adhered to. | |
1108 | */ | |
1109 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1110 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1111 | LTTNG_SYMBOL_NAME_LEN)) { | |
1112 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1113 | goto error; | |
1114 | } | |
1115 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1116 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1117 | LTTNG_SYMBOL_NAME_LEN)) { | |
1118 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1119 | goto error; | |
1120 | } | |
1121 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1122 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1123 | LTTNG_SYMBOL_NAME_LEN)) { | |
1124 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1125 | goto error; | |
1126 | } | |
1127 | } | |
1128 | ||
2f77fc4b DG |
1129 | chan_ht = usess->domain_global.channels; |
1130 | ||
1131 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1132 | if (uchan == NULL) { | |
7972aab2 | 1133 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1134 | if (attr->name[0] != '\0') { |
1135 | usess->has_non_default_channel = 1; | |
1136 | } | |
2f77fc4b | 1137 | } else { |
7972aab2 | 1138 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1139 | } |
1140 | break; | |
1141 | } | |
2f77fc4b | 1142 | default: |
f73fabfd | 1143 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1144 | goto error; |
1145 | } | |
1146 | ||
1147 | error: | |
2223c96f | 1148 | rcu_read_unlock(); |
1f345e94 | 1149 | end: |
2f77fc4b DG |
1150 | return ret; |
1151 | } | |
1152 | ||
2f77fc4b DG |
1153 | /* |
1154 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1155 | */ | |
1156 | int cmd_disable_event(struct ltt_session *session, int domain, | |
6e911cad MD |
1157 | char *channel_name, |
1158 | struct lttng_event *event) | |
2f77fc4b DG |
1159 | { |
1160 | int ret; | |
6e911cad MD |
1161 | char *event_name; |
1162 | ||
18a720cd MD |
1163 | DBG("Disable event command for event \'%s\'", event->name); |
1164 | ||
6e911cad | 1165 | event_name = event->name; |
1290b5d8 JG |
1166 | if (validate_event_name(event_name)) { |
1167 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1168 | goto error; | |
1169 | } | |
6e911cad | 1170 | |
9b7431cf JG |
1171 | /* Error out on unhandled search criteria */ |
1172 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1173 | || event->pid || event->filter || event->exclusion) { |
1290b5d8 JG |
1174 | ret = LTTNG_ERR_UNK; |
1175 | goto error; | |
6e911cad | 1176 | } |
2f77fc4b | 1177 | |
2223c96f DG |
1178 | rcu_read_lock(); |
1179 | ||
2f77fc4b DG |
1180 | switch (domain) { |
1181 | case LTTNG_DOMAIN_KERNEL: | |
1182 | { | |
1183 | struct ltt_kernel_channel *kchan; | |
1184 | struct ltt_kernel_session *ksess; | |
1185 | ||
1186 | ksess = session->kernel_session; | |
1187 | ||
85076754 MD |
1188 | /* |
1189 | * If a non-default channel has been created in the | |
1190 | * session, explicitely require that -c chan_name needs | |
1191 | * to be provided. | |
1192 | */ | |
1193 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1194 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1290b5d8 | 1195 | goto error_unlock; |
85076754 MD |
1196 | } |
1197 | ||
2f77fc4b DG |
1198 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1199 | if (kchan == NULL) { | |
f73fabfd | 1200 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
1290b5d8 | 1201 | goto error_unlock; |
2f77fc4b DG |
1202 | } |
1203 | ||
6e911cad MD |
1204 | switch (event->type) { |
1205 | case LTTNG_EVENT_ALL: | |
6ed2fd39 | 1206 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1207 | case LTTNG_EVENT_SYSCALL: |
6ed2fd39 JR |
1208 | case LTTNG_EVENT_PROBE: |
1209 | case LTTNG_EVENT_FUNCTION: | |
1210 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1211 | if (event_name[0] == '\0') { | |
1212 | ret = event_kernel_disable_event(kchan, | |
1213 | NULL, event->type); | |
29c62722 | 1214 | } else { |
d0ae4ea8 | 1215 | ret = event_kernel_disable_event(kchan, |
6ed2fd39 | 1216 | event_name, event->type); |
29c62722 | 1217 | } |
6e911cad | 1218 | if (ret != LTTNG_OK) { |
1290b5d8 | 1219 | goto error_unlock; |
6e911cad MD |
1220 | } |
1221 | break; | |
6e911cad MD |
1222 | default: |
1223 | ret = LTTNG_ERR_UNK; | |
1290b5d8 | 1224 | goto error_unlock; |
2f77fc4b DG |
1225 | } |
1226 | ||
1227 | kernel_wait_quiescent(kernel_tracer_fd); | |
1228 | break; | |
1229 | } | |
1230 | case LTTNG_DOMAIN_UST: | |
1231 | { | |
1232 | struct ltt_ust_channel *uchan; | |
1233 | struct ltt_ust_session *usess; | |
1234 | ||
1235 | usess = session->ust_session; | |
1236 | ||
1290b5d8 JG |
1237 | if (validate_ust_event_name(event_name)) { |
1238 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1239 | goto error_unlock; | |
1240 | } | |
1241 | ||
85076754 MD |
1242 | /* |
1243 | * If a non-default channel has been created in the | |
6ed2fd39 | 1244 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1245 | * to be provided. |
1246 | */ | |
1247 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1248 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1290b5d8 | 1249 | goto error_unlock; |
85076754 MD |
1250 | } |
1251 | ||
2f77fc4b DG |
1252 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1253 | channel_name); | |
1254 | if (uchan == NULL) { | |
f73fabfd | 1255 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
1290b5d8 | 1256 | goto error_unlock; |
2f77fc4b DG |
1257 | } |
1258 | ||
6e911cad MD |
1259 | switch (event->type) { |
1260 | case LTTNG_EVENT_ALL: | |
82ba26e9 JR |
1261 | /* |
1262 | * An empty event name means that everything | |
1263 | * should be disabled. | |
1264 | */ | |
1265 | if (event->name[0] == '\0') { | |
1266 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
8bee8347 JR |
1267 | } else { |
1268 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1269 | event_name); | |
1270 | } | |
6e911cad | 1271 | if (ret != LTTNG_OK) { |
1290b5d8 | 1272 | goto error_unlock; |
6e911cad MD |
1273 | } |
1274 | break; | |
1275 | default: | |
1276 | ret = LTTNG_ERR_UNK; | |
1290b5d8 | 1277 | goto error_unlock; |
2f77fc4b DG |
1278 | } |
1279 | ||
1280 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1281 | channel_name); | |
1282 | break; | |
1283 | } | |
5cdb6027 | 1284 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1285 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1286 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1287 | { |
fefd409b | 1288 | struct agent *agt; |
f20baf8e DG |
1289 | struct ltt_ust_session *usess = session->ust_session; |
1290 | ||
1291 | assert(usess); | |
1292 | ||
6e911cad MD |
1293 | switch (event->type) { |
1294 | case LTTNG_EVENT_ALL: | |
1295 | break; | |
1296 | default: | |
1297 | ret = LTTNG_ERR_UNK; | |
1290b5d8 | 1298 | goto error_unlock; |
6e911cad MD |
1299 | } |
1300 | ||
5cdb6027 | 1301 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1302 | if (!agt) { |
1303 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
1290b5d8 | 1304 | goto error_unlock; |
fefd409b | 1305 | } |
82ba26e9 JR |
1306 | /* |
1307 | * An empty event name means that everything | |
1308 | * should be disabled. | |
1309 | */ | |
1310 | if (event->name[0] == '\0') { | |
18a720cd MD |
1311 | ret = event_agent_disable_all(usess, agt); |
1312 | } else { | |
1313 | ret = event_agent_disable(usess, agt, event_name); | |
1314 | } | |
f20baf8e | 1315 | if (ret != LTTNG_OK) { |
1290b5d8 | 1316 | goto error_unlock; |
f20baf8e DG |
1317 | } |
1318 | ||
1319 | break; | |
1320 | } | |
2f77fc4b | 1321 | default: |
f73fabfd | 1322 | ret = LTTNG_ERR_UND; |
1290b5d8 | 1323 | goto error_unlock; |
2f77fc4b DG |
1324 | } |
1325 | ||
f73fabfd | 1326 | ret = LTTNG_OK; |
2f77fc4b | 1327 | |
1290b5d8 | 1328 | error_unlock: |
2223c96f | 1329 | rcu_read_unlock(); |
1290b5d8 | 1330 | error: |
2f77fc4b DG |
1331 | return ret; |
1332 | } | |
1333 | ||
2f77fc4b DG |
1334 | /* |
1335 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1336 | */ | |
1337 | int cmd_add_context(struct ltt_session *session, int domain, | |
601d5acf | 1338 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1339 | { |
d5979e4a | 1340 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
2f77fc4b DG |
1341 | |
1342 | switch (domain) { | |
1343 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1344 | assert(session->kernel_session); |
1345 | ||
1346 | if (session->kernel_session->channel_count == 0) { | |
1347 | /* Create default channel */ | |
1348 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1349 | if (ret != LTTNG_OK) { | |
1350 | goto error; | |
1351 | } | |
d5979e4a | 1352 | chan_kern_created = 1; |
979e618e | 1353 | } |
2f77fc4b | 1354 | /* Add kernel context to kernel tracer */ |
601d5acf | 1355 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1356 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1357 | goto error; |
1358 | } | |
1359 | break; | |
1360 | case LTTNG_DOMAIN_UST: | |
1361 | { | |
1362 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1363 | unsigned int chan_count; |
1364 | ||
2f77fc4b DG |
1365 | assert(usess); |
1366 | ||
85076754 | 1367 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1368 | if (chan_count == 0) { |
1369 | struct lttng_channel *attr; | |
1370 | /* Create default channel */ | |
0a9c6494 | 1371 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1372 | if (attr == NULL) { |
1373 | ret = LTTNG_ERR_FATAL; | |
1374 | goto error; | |
1375 | } | |
1376 | ||
7972aab2 | 1377 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1378 | if (ret != LTTNG_OK) { |
1379 | free(attr); | |
1380 | goto error; | |
1381 | } | |
1382 | free(attr); | |
d5979e4a | 1383 | chan_ust_created = 1; |
979e618e DG |
1384 | } |
1385 | ||
601d5acf | 1386 | ret = context_ust_add(usess, domain, ctx, channel_name); |
f73fabfd | 1387 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1388 | goto error; |
1389 | } | |
1390 | break; | |
1391 | } | |
2f77fc4b | 1392 | default: |
f73fabfd | 1393 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1394 | goto error; |
1395 | } | |
1396 | ||
d5979e4a | 1397 | return LTTNG_OK; |
2f77fc4b DG |
1398 | |
1399 | error: | |
d5979e4a DG |
1400 | if (chan_kern_created) { |
1401 | struct ltt_kernel_channel *kchan = | |
1402 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1403 | session->kernel_session); | |
1404 | /* Created previously, this should NOT fail. */ | |
1405 | assert(kchan); | |
1406 | kernel_destroy_channel(kchan); | |
1407 | } | |
1408 | ||
1409 | if (chan_ust_created) { | |
1410 | struct ltt_ust_channel *uchan = | |
1411 | trace_ust_find_channel_by_name( | |
1412 | session->ust_session->domain_global.channels, | |
1413 | DEFAULT_CHANNEL_NAME); | |
1414 | /* Created previously, this should NOT fail. */ | |
1415 | assert(uchan); | |
1416 | /* Remove from the channel list of the session. */ | |
1417 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1418 | uchan); | |
1419 | trace_ust_destroy_channel(uchan); | |
1420 | } | |
2f77fc4b DG |
1421 | return ret; |
1422 | } | |
1423 | ||
930a2e99 JG |
1424 | static int validate_event_name(const char *name) |
1425 | { | |
1426 | int ret = 0; | |
1427 | const char *c = name; | |
1428 | const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN; | |
1429 | ||
1430 | /* | |
1431 | * Make sure that unescaped wildcards are only used as the last | |
1432 | * character of the event name. | |
1433 | */ | |
1434 | while (c < event_name_end) { | |
1435 | switch (*c) { | |
1436 | case '\0': | |
1437 | goto end; | |
1438 | case '\\': | |
1439 | c++; | |
1440 | break; | |
1441 | case '*': | |
1442 | if ((c + 1) < event_name_end && *(c + 1)) { | |
1443 | /* Wildcard is not the last character */ | |
1444 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1445 | goto end; | |
1446 | } | |
1447 | default: | |
1448 | break; | |
1449 | } | |
1450 | c++; | |
1451 | } | |
1452 | end: | |
1453 | return ret; | |
1454 | } | |
1455 | ||
c8100299 JG |
1456 | static inline bool name_starts_with(const char *name, const char *prefix) |
1457 | { | |
1458 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1459 | ||
1460 | return !strncmp(name, prefix, max_cmp_len); | |
1461 | } | |
1462 | ||
1463 | /* Perform userspace-specific event name validation */ | |
1464 | static int validate_ust_event_name(const char *name) | |
1465 | { | |
1466 | int ret = 0; | |
1467 | ||
1468 | if (!name) { | |
1469 | ret = -1; | |
1470 | goto end; | |
1471 | } | |
1472 | ||
1473 | /* | |
1474 | * Check name against all internal UST event component namespaces used | |
1475 | * by the agents. | |
1476 | */ | |
1477 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1478 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1479 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1480 | ret = -1; | |
1481 | } | |
1482 | ||
1483 | end: | |
1484 | return ret; | |
1485 | } | |
9732459c | 1486 | |
2f77fc4b | 1487 | /* |
9732459c JG |
1488 | * Internal version of cmd_enable_event() with a supplemental |
1489 | * "internal_event" flag which is used to enable internal events which should | |
1490 | * be hidden from clients. Such events are used in the agent implementation to | |
1491 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1492 | */ |
9732459c JG |
1493 | static int _cmd_enable_event(struct ltt_session *session, |
1494 | struct lttng_domain *domain, | |
025faf73 | 1495 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1496 | char *filter_expression, |
db8f1377 JI |
1497 | struct lttng_filter_bytecode *filter, |
1498 | struct lttng_event_exclusion *exclusion, | |
9732459c | 1499 | int wpipe, bool internal_event) |
2f77fc4b | 1500 | { |
e5f5db7f | 1501 | int ret, channel_created = 0; |
2f77fc4b DG |
1502 | struct lttng_channel *attr; |
1503 | ||
1504 | assert(session); | |
1505 | assert(event); | |
1506 | assert(channel_name); | |
1507 | ||
18a720cd MD |
1508 | DBG("Enable event command for event \'%s\'", event->name); |
1509 | ||
57dc4ef3 MD |
1510 | rcu_read_lock(); |
1511 | ||
930a2e99 JG |
1512 | ret = validate_event_name(event->name); |
1513 | if (ret) { | |
1514 | goto error; | |
1515 | } | |
1516 | ||
7972aab2 | 1517 | switch (domain->type) { |
2f77fc4b DG |
1518 | case LTTNG_DOMAIN_KERNEL: |
1519 | { | |
1520 | struct ltt_kernel_channel *kchan; | |
1521 | ||
85076754 MD |
1522 | /* |
1523 | * If a non-default channel has been created in the | |
1524 | * session, explicitely require that -c chan_name needs | |
1525 | * to be provided. | |
1526 | */ | |
1527 | if (session->kernel_session->has_non_default_channel | |
1528 | && channel_name[0] == '\0') { | |
1529 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1530 | goto error; | |
1531 | } | |
1532 | ||
2f77fc4b DG |
1533 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1534 | session->kernel_session); | |
1535 | if (kchan == NULL) { | |
0a9c6494 DG |
1536 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1537 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1538 | if (attr == NULL) { |
f73fabfd | 1539 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1540 | goto error; |
1541 | } | |
0425a2b2 MD |
1542 | if (lttng_strncpy(attr->name, channel_name, |
1543 | sizeof(attr->name))) { | |
1544 | ret = LTTNG_ERR_INVALID; | |
1545 | free(attr); | |
1546 | goto error; | |
1547 | } | |
2f77fc4b DG |
1548 | |
1549 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1550 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1551 | free(attr); |
1552 | goto error; | |
1553 | } | |
1554 | free(attr); | |
e5f5db7f DG |
1555 | |
1556 | channel_created = 1; | |
2f77fc4b DG |
1557 | } |
1558 | ||
1559 | /* Get the newly created kernel channel pointer */ | |
1560 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1561 | session->kernel_session); | |
1562 | if (kchan == NULL) { | |
1563 | /* This sould not happen... */ | |
f73fabfd | 1564 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1565 | goto error; |
1566 | } | |
1567 | ||
6e911cad MD |
1568 | switch (event->type) { |
1569 | case LTTNG_EVENT_ALL: | |
29c62722 | 1570 | { |
00a62084 MD |
1571 | char *filter_expression_a = NULL; |
1572 | struct lttng_filter_bytecode *filter_a = NULL; | |
1573 | ||
1574 | /* | |
1575 | * We need to duplicate filter_expression and filter, | |
1576 | * because ownership is passed to first enable | |
1577 | * event. | |
1578 | */ | |
1579 | if (filter_expression) { | |
1580 | filter_expression_a = strdup(filter_expression); | |
1581 | if (!filter_expression_a) { | |
1582 | ret = LTTNG_ERR_FATAL; | |
1583 | goto error; | |
1584 | } | |
1585 | } | |
1586 | if (filter) { | |
1587 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1588 | if (!filter_a) { | |
1589 | free(filter_expression_a); | |
1590 | ret = LTTNG_ERR_FATAL; | |
1591 | goto error; | |
1592 | } | |
1593 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1594 | } | |
29c62722 | 1595 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1596 | ret = event_kernel_enable_event(kchan, event, |
1597 | filter_expression, filter); | |
a969e101 MD |
1598 | /* We have passed ownership */ |
1599 | filter_expression = NULL; | |
1600 | filter = NULL; | |
29c62722 MD |
1601 | if (ret != LTTNG_OK) { |
1602 | if (channel_created) { | |
1603 | /* Let's not leak a useless channel. */ | |
1604 | kernel_destroy_channel(kchan); | |
1605 | } | |
00a62084 MD |
1606 | free(filter_expression_a); |
1607 | free(filter_a); | |
29c62722 MD |
1608 | goto error; |
1609 | } | |
1610 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1611 | ret = event_kernel_enable_event(kchan, event, |
1612 | filter_expression_a, filter_a); | |
0217a5a1 AB |
1613 | /* We have passed ownership */ |
1614 | filter_expression_a = NULL; | |
1615 | filter_a = NULL; | |
29c62722 MD |
1616 | if (ret != LTTNG_OK) { |
1617 | goto error; | |
1618 | } | |
1619 | break; | |
1620 | } | |
6e6ef3d7 DG |
1621 | case LTTNG_EVENT_PROBE: |
1622 | case LTTNG_EVENT_FUNCTION: | |
1623 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1624 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
1625 | ret = event_kernel_enable_event(kchan, event, |
1626 | filter_expression, filter); | |
a969e101 MD |
1627 | /* We have passed ownership */ |
1628 | filter_expression = NULL; | |
1629 | filter = NULL; | |
6e911cad MD |
1630 | if (ret != LTTNG_OK) { |
1631 | if (channel_created) { | |
1632 | /* Let's not leak a useless channel. */ | |
1633 | kernel_destroy_channel(kchan); | |
1634 | } | |
1635 | goto error; | |
e5f5db7f | 1636 | } |
6e911cad MD |
1637 | break; |
1638 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1639 | ret = event_kernel_enable_event(kchan, event, |
1640 | filter_expression, filter); | |
a969e101 MD |
1641 | /* We have passed ownership */ |
1642 | filter_expression = NULL; | |
1643 | filter = NULL; | |
e2b957af MD |
1644 | if (ret != LTTNG_OK) { |
1645 | goto error; | |
1646 | } | |
6e911cad MD |
1647 | break; |
1648 | default: | |
1649 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1650 | goto error; |
1651 | } | |
1652 | ||
1653 | kernel_wait_quiescent(kernel_tracer_fd); | |
1654 | break; | |
1655 | } | |
1656 | case LTTNG_DOMAIN_UST: | |
1657 | { | |
1658 | struct ltt_ust_channel *uchan; | |
1659 | struct ltt_ust_session *usess = session->ust_session; | |
1660 | ||
1661 | assert(usess); | |
1662 | ||
85076754 MD |
1663 | /* |
1664 | * If a non-default channel has been created in the | |
1665 | * session, explicitely require that -c chan_name needs | |
1666 | * to be provided. | |
1667 | */ | |
1668 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1669 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1670 | goto error; | |
1671 | } | |
1672 | ||
2f77fc4b DG |
1673 | /* Get channel from global UST domain */ |
1674 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1675 | channel_name); | |
1676 | if (uchan == NULL) { | |
1677 | /* Create default channel */ | |
0a9c6494 DG |
1678 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
1679 | usess->buffer_type); | |
2f77fc4b | 1680 | if (attr == NULL) { |
f73fabfd | 1681 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1682 | goto error; |
1683 | } | |
0425a2b2 MD |
1684 | if (lttng_strncpy(attr->name, channel_name, |
1685 | sizeof(attr->name))) { | |
1686 | ret = LTTNG_ERR_INVALID; | |
1687 | free(attr); | |
1688 | goto error; | |
1689 | } | |
2f77fc4b DG |
1690 | |
1691 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1692 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1693 | free(attr); |
1694 | goto error; | |
1695 | } | |
1696 | free(attr); | |
1697 | ||
1698 | /* Get the newly created channel reference back */ | |
1699 | uchan = trace_ust_find_channel_by_name( | |
1700 | usess->domain_global.channels, channel_name); | |
1701 | assert(uchan); | |
1702 | } | |
1703 | ||
9ab6d7ea JG |
1704 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
1705 | /* | |
1706 | * Don't allow users to add UST events to channels which | |
1707 | * are assigned to a userspace subdomain (JUL, Log4J, | |
1708 | * Python, etc.). | |
1709 | */ | |
1710 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
1711 | goto error; | |
1712 | } | |
1713 | ||
c8100299 JG |
1714 | if (!internal_event) { |
1715 | /* | |
1716 | * Ensure the event name is not reserved for internal | |
1717 | * use. | |
1718 | */ | |
1719 | ret = validate_ust_event_name(event->name); | |
1720 | if (ret) { | |
1721 | WARN("Userspace event name %s failed validation.", | |
1722 | event->name ? | |
1723 | event->name : "NULL"); | |
1724 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1725 | goto error; | |
1726 | } | |
1727 | } | |
1728 | ||
2f77fc4b | 1729 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 1730 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
9732459c JG |
1731 | filter_expression, filter, exclusion, |
1732 | internal_event); | |
49d21f93 MD |
1733 | /* We have passed ownership */ |
1734 | filter_expression = NULL; | |
1735 | filter = NULL; | |
1736 | exclusion = NULL; | |
85f2f68c JG |
1737 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
1738 | goto already_enabled; | |
1739 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
1740 | goto error; |
1741 | } | |
1742 | break; | |
1743 | } | |
5cdb6027 | 1744 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1745 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1746 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1747 | { |
da6c3a50 | 1748 | const char *default_event_name, *default_chan_name; |
fefd409b | 1749 | struct agent *agt; |
f20baf8e DG |
1750 | struct lttng_event uevent; |
1751 | struct lttng_domain tmp_dom; | |
1752 | struct ltt_ust_session *usess = session->ust_session; | |
1753 | ||
1754 | assert(usess); | |
1755 | ||
5cdb6027 | 1756 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 1757 | if (!agt) { |
5cdb6027 | 1758 | agt = agent_create(domain->type); |
fefd409b | 1759 | if (!agt) { |
948f8adb | 1760 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
1761 | goto error; |
1762 | } | |
1763 | agent_add(agt, usess->agents); | |
1764 | } | |
1765 | ||
022d91ba | 1766 | /* Create the default tracepoint. */ |
996de3c7 | 1767 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
1768 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
1769 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
0a3fca4d JG |
1770 | default_event_name = event_get_default_agent_ust_name( |
1771 | domain->type); | |
da6c3a50 | 1772 | if (!default_event_name) { |
948f8adb | 1773 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 1774 | goto error; |
f43f95a9 | 1775 | } |
da6c3a50 | 1776 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
1777 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
1778 | ||
1779 | /* | |
1780 | * The domain type is changed because we are about to enable the | |
1781 | * default channel and event for the JUL domain that are hardcoded. | |
1782 | * This happens in the UST domain. | |
1783 | */ | |
1784 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
1785 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
1786 | ||
0e115563 DG |
1787 | switch (domain->type) { |
1788 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 1789 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
1790 | break; |
1791 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 1792 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
1793 | break; |
1794 | case LTTNG_DOMAIN_PYTHON: | |
1795 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
1796 | break; | |
1797 | default: | |
1798 | /* The switch/case we are in should avoid this else big problem */ | |
1799 | assert(0); | |
da6c3a50 DG |
1800 | } |
1801 | ||
971da06a | 1802 | { |
d75bffee | 1803 | char *filter_expression_copy = NULL; |
0a3fca4d | 1804 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
1805 | |
1806 | if (filter) { | |
0a3fca4d JG |
1807 | const size_t filter_size = sizeof( |
1808 | struct lttng_filter_bytecode) | |
1809 | + filter->len; | |
1810 | ||
1811 | filter_copy = zmalloc(filter_size); | |
971da06a | 1812 | if (!filter_copy) { |
a745883a | 1813 | ret = LTTNG_ERR_NOMEM; |
4c579b1f | 1814 | goto error; |
971da06a | 1815 | } |
0a3fca4d | 1816 | memcpy(filter_copy, filter, filter_size); |
971da06a | 1817 | |
d75bffee JG |
1818 | filter_expression_copy = |
1819 | strdup(filter_expression); | |
1820 | if (!filter_expression) { | |
1821 | ret = LTTNG_ERR_NOMEM; | |
0a3fca4d JG |
1822 | } |
1823 | ||
1824 | if (!filter_expression_copy || !filter_copy) { | |
1825 | free(filter_expression_copy); | |
1826 | free(filter_copy); | |
1827 | goto error; | |
d75bffee | 1828 | } |
971da06a JG |
1829 | } |
1830 | ||
9732459c | 1831 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 1832 | (char *) default_chan_name, |
d75bffee JG |
1833 | &uevent, filter_expression_copy, |
1834 | filter_copy, NULL, wpipe); | |
971da06a JG |
1835 | } |
1836 | ||
85f2f68c JG |
1837 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
1838 | goto already_enabled; | |
1839 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
1840 | goto error; |
1841 | } | |
1842 | ||
1843 | /* The wild card * means that everything should be enabled. */ | |
1844 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
d75bffee JG |
1845 | ret = event_agent_enable_all(usess, agt, event, filter, |
1846 | filter_expression); | |
f20baf8e | 1847 | } else { |
d75bffee JG |
1848 | ret = event_agent_enable(usess, agt, event, filter, |
1849 | filter_expression); | |
f20baf8e | 1850 | } |
0a3fca4d JG |
1851 | filter = NULL; |
1852 | filter_expression = NULL; | |
f20baf8e DG |
1853 | if (ret != LTTNG_OK) { |
1854 | goto error; | |
1855 | } | |
1856 | ||
1857 | break; | |
1858 | } | |
2f77fc4b | 1859 | default: |
f73fabfd | 1860 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1861 | goto error; |
1862 | } | |
1863 | ||
f73fabfd | 1864 | ret = LTTNG_OK; |
2f77fc4b | 1865 | |
85f2f68c | 1866 | already_enabled: |
2f77fc4b | 1867 | error: |
49d21f93 MD |
1868 | free(filter_expression); |
1869 | free(filter); | |
1870 | free(exclusion); | |
2223c96f | 1871 | rcu_read_unlock(); |
2f77fc4b DG |
1872 | return ret; |
1873 | } | |
1874 | ||
9732459c JG |
1875 | /* |
1876 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
1877 | * We own filter, exclusion, and filter_expression. | |
1878 | */ | |
1879 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
1880 | char *channel_name, struct lttng_event *event, | |
1881 | char *filter_expression, | |
1882 | struct lttng_filter_bytecode *filter, | |
1883 | struct lttng_event_exclusion *exclusion, | |
1884 | int wpipe) | |
1885 | { | |
1886 | return _cmd_enable_event(session, domain, channel_name, event, | |
1887 | filter_expression, filter, exclusion, wpipe, false); | |
1888 | } | |
1889 | ||
1890 | /* | |
1891 | * Enable an event which is internal to LTTng. An internal should | |
1892 | * never be made visible to clients and are immune to checks such as | |
1893 | * reserved names. | |
1894 | */ | |
1895 | static int cmd_enable_event_internal(struct ltt_session *session, | |
1896 | struct lttng_domain *domain, | |
1897 | char *channel_name, struct lttng_event *event, | |
1898 | char *filter_expression, | |
1899 | struct lttng_filter_bytecode *filter, | |
1900 | struct lttng_event_exclusion *exclusion, | |
1901 | int wpipe) | |
1902 | { | |
1903 | return _cmd_enable_event(session, domain, channel_name, event, | |
1904 | filter_expression, filter, exclusion, wpipe, true); | |
1905 | } | |
1906 | ||
2f77fc4b DG |
1907 | /* |
1908 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
1909 | */ | |
1910 | ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
1911 | { | |
1912 | int ret; | |
1913 | ssize_t nb_events = 0; | |
1914 | ||
1915 | switch (domain) { | |
1916 | case LTTNG_DOMAIN_KERNEL: | |
1917 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
1918 | if (nb_events < 0) { | |
f73fabfd | 1919 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
1920 | goto error; |
1921 | } | |
1922 | break; | |
1923 | case LTTNG_DOMAIN_UST: | |
1924 | nb_events = ust_app_list_events(events); | |
1925 | if (nb_events < 0) { | |
f73fabfd | 1926 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
1927 | goto error; |
1928 | } | |
1929 | break; | |
5cdb6027 | 1930 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 1931 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1932 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 1933 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
1934 | if (nb_events < 0) { |
1935 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
1936 | goto error; | |
1937 | } | |
1938 | break; | |
2f77fc4b | 1939 | default: |
f73fabfd | 1940 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1941 | goto error; |
1942 | } | |
1943 | ||
1944 | return nb_events; | |
1945 | ||
1946 | error: | |
1947 | /* Return negative value to differentiate return code */ | |
1948 | return -ret; | |
1949 | } | |
1950 | ||
1951 | /* | |
1952 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
1953 | */ | |
1954 | ssize_t cmd_list_tracepoint_fields(int domain, | |
1955 | struct lttng_event_field **fields) | |
1956 | { | |
1957 | int ret; | |
1958 | ssize_t nb_fields = 0; | |
1959 | ||
1960 | switch (domain) { | |
1961 | case LTTNG_DOMAIN_UST: | |
1962 | nb_fields = ust_app_list_event_fields(fields); | |
1963 | if (nb_fields < 0) { | |
f73fabfd | 1964 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
1965 | goto error; |
1966 | } | |
1967 | break; | |
1968 | case LTTNG_DOMAIN_KERNEL: | |
1969 | default: /* fall-through */ | |
f73fabfd | 1970 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1971 | goto error; |
1972 | } | |
1973 | ||
1974 | return nb_fields; | |
1975 | ||
1976 | error: | |
1977 | /* Return negative value to differentiate return code */ | |
1978 | return -ret; | |
1979 | } | |
1980 | ||
834978fd DG |
1981 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
1982 | { | |
1983 | return syscall_table_list(events); | |
1984 | } | |
1985 | ||
a5dfbb9d MD |
1986 | /* |
1987 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
1988 | * | |
1989 | * Called with session lock held. | |
1990 | */ | |
1991 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
1992 | int domain, int32_t **pids) | |
1993 | { | |
1994 | int ret; | |
1995 | ssize_t nr_pids = 0; | |
1996 | ||
1997 | switch (domain) { | |
1998 | case LTTNG_DOMAIN_KERNEL: | |
1999 | { | |
2000 | struct ltt_kernel_session *ksess; | |
2001 | ||
2002 | ksess = session->kernel_session; | |
2003 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2004 | if (nr_pids < 0) { | |
2005 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2006 | goto error; | |
2007 | } | |
2008 | break; | |
2009 | } | |
2010 | case LTTNG_DOMAIN_UST: | |
2011 | { | |
2012 | struct ltt_ust_session *usess; | |
2013 | ||
2014 | usess = session->ust_session; | |
2015 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2016 | if (nr_pids < 0) { | |
2017 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2018 | goto error; | |
2019 | } | |
2020 | break; | |
2021 | } | |
2022 | case LTTNG_DOMAIN_LOG4J: | |
2023 | case LTTNG_DOMAIN_JUL: | |
2024 | case LTTNG_DOMAIN_PYTHON: | |
2025 | default: | |
2026 | ret = LTTNG_ERR_UND; | |
2027 | goto error; | |
2028 | } | |
2029 | ||
2030 | return nr_pids; | |
2031 | ||
2032 | error: | |
2033 | /* Return negative value to differentiate return code */ | |
2034 | return -ret; | |
2035 | } | |
2036 | ||
2f77fc4b DG |
2037 | /* |
2038 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2039 | * |
2040 | * Called with session mutex held. | |
2f77fc4b DG |
2041 | */ |
2042 | int cmd_start_trace(struct ltt_session *session) | |
2043 | { | |
2044 | int ret; | |
cde3e505 | 2045 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2046 | struct ltt_kernel_session *ksession; |
2047 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2048 | |
2049 | assert(session); | |
2050 | ||
2051 | /* Ease our life a bit ;) */ | |
2052 | ksession = session->kernel_session; | |
2053 | usess = session->ust_session; | |
2054 | ||
8382cf6f DG |
2055 | /* Is the session already started? */ |
2056 | if (session->active) { | |
f73fabfd | 2057 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2058 | goto error; |
2059 | } | |
2060 | ||
cde3e505 DG |
2061 | /* |
2062 | * Starting a session without channel is useless since after that it's not | |
2063 | * possible to enable channel thus inform the client. | |
2064 | */ | |
2065 | if (usess && usess->domain_global.channels) { | |
a9e41044 | 2066 | rcu_read_lock(); |
cde3e505 | 2067 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); |
a9e41044 | 2068 | rcu_read_unlock(); |
cde3e505 DG |
2069 | } |
2070 | if (ksession) { | |
2071 | nb_chan += ksession->channel_count; | |
2072 | } | |
2073 | if (!nb_chan) { | |
2074 | ret = LTTNG_ERR_NO_CHANNEL; | |
2075 | goto error; | |
2076 | } | |
2077 | ||
2f77fc4b DG |
2078 | /* Kernel tracing */ |
2079 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2080 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2081 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2082 | goto error; |
2083 | } | |
2f77fc4b DG |
2084 | } |
2085 | ||
2086 | /* Flag session that trace should start automatically */ | |
2087 | if (usess) { | |
14fb1ebe DG |
2088 | /* |
2089 | * Even though the start trace might fail, flag this session active so | |
2090 | * other application coming in are started by default. | |
2091 | */ | |
2092 | usess->active = 1; | |
2f77fc4b DG |
2093 | |
2094 | ret = ust_app_start_trace_all(usess); | |
2095 | if (ret < 0) { | |
f73fabfd | 2096 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2097 | goto error; |
2098 | } | |
2099 | } | |
2100 | ||
8382cf6f DG |
2101 | /* Flag this after a successful start. */ |
2102 | session->has_been_started = 1; | |
2103 | session->active = 1; | |
9b6c7ec5 | 2104 | |
f73fabfd | 2105 | ret = LTTNG_OK; |
2f77fc4b DG |
2106 | |
2107 | error: | |
2108 | return ret; | |
2109 | } | |
2110 | ||
2111 | /* | |
2112 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2113 | */ | |
2114 | int cmd_stop_trace(struct ltt_session *session) | |
2115 | { | |
2116 | int ret; | |
2117 | struct ltt_kernel_channel *kchan; | |
2118 | struct ltt_kernel_session *ksession; | |
2119 | struct ltt_ust_session *usess; | |
2120 | ||
2121 | assert(session); | |
2122 | ||
2123 | /* Short cut */ | |
2124 | ksession = session->kernel_session; | |
2125 | usess = session->ust_session; | |
2126 | ||
8382cf6f DG |
2127 | /* Session is not active. Skip everythong and inform the client. */ |
2128 | if (!session->active) { | |
f73fabfd | 2129 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2130 | goto error; |
2131 | } | |
2132 | ||
2f77fc4b | 2133 | /* Kernel tracer */ |
14fb1ebe | 2134 | if (ksession && ksession->active) { |
2f77fc4b DG |
2135 | DBG("Stop kernel tracing"); |
2136 | ||
64a269c3 MD |
2137 | ret = kernel_stop_session(ksession); |
2138 | if (ret < 0) { | |
2139 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
2140 | goto error; | |
2141 | } | |
2142 | ||
2143 | kernel_wait_quiescent(kernel_tracer_fd); | |
2144 | ||
2145 | /* Flush metadata after stopping (if exists) */ | |
2f77fc4b DG |
2146 | if (ksession->metadata_stream_fd >= 0) { |
2147 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2148 | if (ret < 0) { | |
2149 | ERR("Kernel metadata flush failed"); | |
2150 | } | |
2151 | } | |
2152 | ||
64a269c3 | 2153 | /* Flush all buffers after stopping */ |
2f77fc4b DG |
2154 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2155 | ret = kernel_flush_buffer(kchan); | |
2156 | if (ret < 0) { | |
2157 | ERR("Kernel flush buffer error"); | |
2158 | } | |
2159 | } | |
2160 | ||
14fb1ebe | 2161 | ksession->active = 0; |
2f77fc4b DG |
2162 | } |
2163 | ||
14fb1ebe DG |
2164 | if (usess && usess->active) { |
2165 | /* | |
2166 | * Even though the stop trace might fail, flag this session inactive so | |
2167 | * other application coming in are not started by default. | |
2168 | */ | |
2169 | usess->active = 0; | |
2f77fc4b DG |
2170 | |
2171 | ret = ust_app_stop_trace_all(usess); | |
2172 | if (ret < 0) { | |
f73fabfd | 2173 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2174 | goto error; |
2175 | } | |
2176 | } | |
2177 | ||
8382cf6f DG |
2178 | /* Flag inactive after a successful stop. */ |
2179 | session->active = 0; | |
f73fabfd | 2180 | ret = LTTNG_OK; |
2f77fc4b DG |
2181 | |
2182 | error: | |
2183 | return ret; | |
2184 | } | |
2185 | ||
2186 | /* | |
2187 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2188 | */ | |
bda32d56 JG |
2189 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2190 | struct lttng_uri *uris) | |
2f77fc4b DG |
2191 | { |
2192 | int ret, i; | |
2193 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2194 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2195 | |
2196 | assert(session); | |
2197 | assert(uris); | |
2198 | assert(nb_uri > 0); | |
2199 | ||
8382cf6f DG |
2200 | /* Can't set consumer URI if the session is active. */ |
2201 | if (session->active) { | |
f73fabfd | 2202 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2203 | goto error; |
2204 | } | |
2205 | ||
bda32d56 | 2206 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2207 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2208 | ret = add_uri_to_consumer(session->consumer, |
2209 | &uris[i], 0, session->name); | |
a74934ba | 2210 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2211 | goto error; |
2212 | } | |
2f77fc4b DG |
2213 | } |
2214 | ||
bda32d56 JG |
2215 | /* Set UST session URIs */ |
2216 | if (session->ust_session) { | |
2217 | for (i = 0; i < nb_uri; i++) { | |
2218 | ret = add_uri_to_consumer( | |
2219 | session->ust_session->consumer, | |
2220 | &uris[i], LTTNG_DOMAIN_UST, | |
2221 | session->name); | |
2222 | if (ret != LTTNG_OK) { | |
2223 | goto error; | |
2224 | } | |
2225 | } | |
2226 | } | |
2227 | ||
2228 | /* Set kernel session URIs */ | |
2229 | if (session->kernel_session) { | |
2230 | for (i = 0; i < nb_uri; i++) { | |
2231 | ret = add_uri_to_consumer( | |
2232 | session->kernel_session->consumer, | |
2233 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2234 | session->name); | |
2235 | if (ret != LTTNG_OK) { | |
2236 | goto error; | |
2237 | } | |
2238 | } | |
2239 | } | |
2240 | ||
7ab70fe0 DG |
2241 | /* |
2242 | * Make sure to set the session in output mode after we set URI since a | |
2243 | * session can be created without URL (thus flagged in no output mode). | |
2244 | */ | |
2245 | session->output_traces = 1; | |
2246 | if (ksess) { | |
2247 | ksess->output_traces = 1; | |
bda32d56 JG |
2248 | } |
2249 | ||
2250 | if (usess) { | |
7ab70fe0 DG |
2251 | usess->output_traces = 1; |
2252 | } | |
2253 | ||
2f77fc4b | 2254 | /* All good! */ |
f73fabfd | 2255 | ret = LTTNG_OK; |
2f77fc4b DG |
2256 | |
2257 | error: | |
2258 | return ret; | |
2259 | } | |
2260 | ||
2261 | /* | |
2262 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2263 | */ | |
2264 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2265 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2266 | { |
2267 | int ret; | |
2f77fc4b DG |
2268 | struct ltt_session *session; |
2269 | ||
2270 | assert(name); | |
2bba9e53 | 2271 | assert(creds); |
785d2d0d | 2272 | |
2f77fc4b DG |
2273 | /* |
2274 | * Verify if the session already exist | |
2275 | * | |
2276 | * XXX: There is no need for the session lock list here since the caller | |
2277 | * (process_client_msg) is holding it. We might want to change that so a | |
2278 | * single command does not lock the entire session list. | |
2279 | */ | |
2280 | session = session_find_by_name(name); | |
2281 | if (session != NULL) { | |
f73fabfd | 2282 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2283 | goto find_error; |
2284 | } | |
2285 | ||
2286 | /* Create tracing session in the registry */ | |
dec56f6c | 2287 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2288 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2289 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2290 | goto session_error; |
2291 | } | |
2292 | ||
2293 | /* | |
2294 | * Get the newly created session pointer back | |
2295 | * | |
2296 | * XXX: There is no need for the session lock list here since the caller | |
2297 | * (process_client_msg) is holding it. We might want to change that so a | |
2298 | * single command does not lock the entire session list. | |
2299 | */ | |
2300 | session = session_find_by_name(name); | |
2301 | assert(session); | |
2302 | ||
ecc48a90 | 2303 | session->live_timer = live_timer; |
2f77fc4b DG |
2304 | /* Create default consumer output for the session not yet created. */ |
2305 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2306 | if (session->consumer == NULL) { | |
f73fabfd | 2307 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2308 | goto consumer_error; |
2309 | } | |
2310 | ||
2bba9e53 | 2311 | if (uris) { |
bda32d56 | 2312 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2313 | if (ret != LTTNG_OK) { |
2314 | goto consumer_error; | |
2315 | } | |
2316 | session->output_traces = 1; | |
2317 | } else { | |
2318 | session->output_traces = 0; | |
2319 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2320 | } |
2321 | ||
2322 | session->consumer->enabled = 1; | |
2323 | ||
f73fabfd | 2324 | return LTTNG_OK; |
2f77fc4b DG |
2325 | |
2326 | consumer_error: | |
2327 | session_destroy(session); | |
2328 | session_error: | |
2329 | find_error: | |
2330 | return ret; | |
2331 | } | |
2332 | ||
27babd3a DG |
2333 | /* |
2334 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2335 | */ | |
2336 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2337 | size_t nb_uri, lttng_sock_cred *creds) | |
2338 | { | |
2339 | int ret; | |
2340 | struct ltt_session *session; | |
2341 | struct snapshot_output *new_output = NULL; | |
2342 | ||
2343 | assert(name); | |
2344 | assert(creds); | |
2345 | ||
2346 | /* | |
2347 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2348 | * received are for a default snapshot output if one. | |
2349 | */ | |
bfaba83f | 2350 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2351 | if (ret != LTTNG_OK) { |
2352 | goto error; | |
2353 | } | |
2354 | ||
2355 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2356 | session = session_find_by_name(name); | |
2357 | assert(session); | |
2358 | ||
2359 | /* Flag session for snapshot mode. */ | |
2360 | session->snapshot_mode = 1; | |
2361 | ||
2362 | /* Skip snapshot output creation if no URI is given. */ | |
2363 | if (nb_uri == 0) { | |
2364 | goto end; | |
2365 | } | |
2366 | ||
2367 | new_output = snapshot_output_alloc(); | |
2368 | if (!new_output) { | |
2369 | ret = LTTNG_ERR_NOMEM; | |
2370 | goto error_snapshot_alloc; | |
2371 | } | |
2372 | ||
2373 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2374 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2375 | if (ret < 0) { | |
2376 | if (ret == -ENOMEM) { | |
2377 | ret = LTTNG_ERR_NOMEM; | |
2378 | } else { | |
2379 | ret = LTTNG_ERR_INVALID; | |
2380 | } | |
2381 | goto error_snapshot; | |
2382 | } | |
2383 | ||
2384 | rcu_read_lock(); | |
2385 | snapshot_add_output(&session->snapshot, new_output); | |
2386 | rcu_read_unlock(); | |
2387 | ||
2388 | end: | |
2389 | return LTTNG_OK; | |
2390 | ||
2391 | error_snapshot: | |
2392 | snapshot_output_destroy(new_output); | |
2393 | error_snapshot_alloc: | |
2394 | session_destroy(session); | |
2395 | error: | |
2396 | return ret; | |
2397 | } | |
2398 | ||
2f77fc4b DG |
2399 | /* |
2400 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2401 | * |
2402 | * Called with session lock held. | |
2f77fc4b DG |
2403 | */ |
2404 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2405 | { | |
2406 | int ret; | |
2407 | struct ltt_ust_session *usess; | |
2408 | struct ltt_kernel_session *ksess; | |
2409 | ||
2410 | /* Safety net */ | |
2411 | assert(session); | |
2412 | ||
2413 | usess = session->ust_session; | |
2414 | ksess = session->kernel_session; | |
2415 | ||
2416 | /* Clean kernel session teardown */ | |
2417 | kernel_destroy_session(ksess); | |
2418 | ||
2419 | /* UST session teardown */ | |
2420 | if (usess) { | |
2421 | /* Close any relayd session */ | |
2422 | consumer_output_send_destroy_relayd(usess->consumer); | |
2423 | ||
2424 | /* Destroy every UST application related to this session. */ | |
2425 | ret = ust_app_destroy_trace_all(usess); | |
2426 | if (ret) { | |
2427 | ERR("Error in ust_app_destroy_trace_all"); | |
2428 | } | |
2429 | ||
2430 | /* Clean up the rest. */ | |
2431 | trace_ust_destroy_session(usess); | |
2432 | } | |
2433 | ||
2434 | /* | |
2435 | * Must notify the kernel thread here to update it's poll set in order to | |
2436 | * remove the channel(s)' fd just destroyed. | |
2437 | */ | |
2438 | ret = notify_thread_pipe(wpipe); | |
2439 | if (ret < 0) { | |
2440 | PERROR("write kernel poll pipe"); | |
2441 | } | |
2442 | ||
2443 | ret = session_destroy(session); | |
2444 | ||
2445 | return ret; | |
2446 | } | |
2447 | ||
2448 | /* | |
2449 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2450 | */ | |
2451 | int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2452 | { | |
2453 | int ret; | |
2454 | ||
2455 | switch (domain) { | |
2456 | case LTTNG_DOMAIN_KERNEL: | |
2457 | { | |
2458 | struct lttng_kernel_calibrate kcalibrate; | |
2459 | ||
2e84128e DG |
2460 | switch (calibrate->type) { |
2461 | case LTTNG_CALIBRATE_FUNCTION: | |
2462 | default: | |
2463 | /* Default and only possible calibrate option. */ | |
2464 | kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE; | |
2465 | break; | |
2466 | } | |
2467 | ||
2f77fc4b DG |
2468 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); |
2469 | if (ret < 0) { | |
f73fabfd | 2470 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2f77fc4b DG |
2471 | goto error; |
2472 | } | |
2473 | break; | |
2474 | } | |
2475 | case LTTNG_DOMAIN_UST: | |
2476 | { | |
2477 | struct lttng_ust_calibrate ucalibrate; | |
2478 | ||
2e84128e DG |
2479 | switch (calibrate->type) { |
2480 | case LTTNG_CALIBRATE_FUNCTION: | |
2481 | default: | |
2482 | /* Default and only possible calibrate option. */ | |
2483 | ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT; | |
2484 | break; | |
2485 | } | |
2486 | ||
2f77fc4b DG |
2487 | ret = ust_app_calibrate_glb(&ucalibrate); |
2488 | if (ret < 0) { | |
f73fabfd | 2489 | ret = LTTNG_ERR_UST_CALIBRATE_FAIL; |
2f77fc4b DG |
2490 | goto error; |
2491 | } | |
2492 | break; | |
2493 | } | |
2494 | default: | |
f73fabfd | 2495 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2496 | goto error; |
2497 | } | |
2498 | ||
f73fabfd | 2499 | ret = LTTNG_OK; |
2f77fc4b DG |
2500 | |
2501 | error: | |
2502 | return ret; | |
2503 | } | |
2504 | ||
2505 | /* | |
2506 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2507 | */ | |
2508 | int cmd_register_consumer(struct ltt_session *session, int domain, | |
2509 | const char *sock_path, struct consumer_data *cdata) | |
2510 | { | |
2511 | int ret, sock; | |
dd81b457 | 2512 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2513 | |
2514 | assert(session); | |
2515 | assert(cdata); | |
2516 | assert(sock_path); | |
2517 | ||
2518 | switch (domain) { | |
2519 | case LTTNG_DOMAIN_KERNEL: | |
2520 | { | |
2521 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2522 | ||
2523 | assert(ksess); | |
2524 | ||
2525 | /* Can't register a consumer if there is already one */ | |
2526 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2527 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2528 | goto error; |
2529 | } | |
2530 | ||
2531 | sock = lttcomm_connect_unix_sock(sock_path); | |
2532 | if (sock < 0) { | |
f73fabfd | 2533 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2534 | goto error; |
2535 | } | |
4ce514c4 | 2536 | cdata->cmd_sock = sock; |
2f77fc4b | 2537 | |
4ce514c4 | 2538 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2539 | if (socket == NULL) { |
f66c074c DG |
2540 | ret = close(sock); |
2541 | if (ret < 0) { | |
2542 | PERROR("close register consumer"); | |
2543 | } | |
4ce514c4 | 2544 | cdata->cmd_sock = -1; |
f73fabfd | 2545 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2546 | goto error; |
2547 | } | |
2548 | ||
2549 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2550 | if (socket->lock == NULL) { | |
2551 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2552 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2553 | goto error; |
2554 | } | |
2555 | pthread_mutex_init(socket->lock, NULL); | |
2556 | socket->registered = 1; | |
2557 | ||
2558 | rcu_read_lock(); | |
2559 | consumer_add_socket(socket, ksess->consumer); | |
2560 | rcu_read_unlock(); | |
2561 | ||
2562 | pthread_mutex_lock(&cdata->pid_mutex); | |
2563 | cdata->pid = -1; | |
2564 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2565 | ||
2566 | break; | |
2567 | } | |
2568 | default: | |
2569 | /* TODO: Userspace tracing */ | |
f73fabfd | 2570 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2571 | goto error; |
2572 | } | |
2573 | ||
dd81b457 | 2574 | return LTTNG_OK; |
2f77fc4b DG |
2575 | |
2576 | error: | |
dd81b457 DG |
2577 | if (socket) { |
2578 | consumer_destroy_socket(socket); | |
2579 | } | |
2f77fc4b DG |
2580 | return ret; |
2581 | } | |
2582 | ||
2583 | /* | |
2584 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2585 | */ | |
2586 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2587 | struct lttng_domain **domains) | |
2588 | { | |
2589 | int ret, index = 0; | |
2590 | ssize_t nb_dom = 0; | |
fefd409b DG |
2591 | struct agent *agt; |
2592 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2593 | |
2594 | if (session->kernel_session != NULL) { | |
2595 | DBG3("Listing domains found kernel domain"); | |
2596 | nb_dom++; | |
2597 | } | |
2598 | ||
2599 | if (session->ust_session != NULL) { | |
2600 | DBG3("Listing domains found UST global domain"); | |
2601 | nb_dom++; | |
3c6a091f | 2602 | |
e0a74f01 | 2603 | rcu_read_lock(); |
fefd409b DG |
2604 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2605 | agt, node.node) { | |
2606 | if (agt->being_used) { | |
2607 | nb_dom++; | |
2608 | } | |
3c6a091f | 2609 | } |
e0a74f01 | 2610 | rcu_read_unlock(); |
2f77fc4b DG |
2611 | } |
2612 | ||
fa64dfb4 JG |
2613 | if (!nb_dom) { |
2614 | goto end; | |
2615 | } | |
2616 | ||
2f77fc4b DG |
2617 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2618 | if (*domains == NULL) { | |
f73fabfd | 2619 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2620 | goto error; |
2621 | } | |
2622 | ||
2623 | if (session->kernel_session != NULL) { | |
2624 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
bd3381e3 PP |
2625 | |
2626 | /* Kernel session buffer type is always GLOBAL */ | |
2627 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2628 | ||
2f77fc4b DG |
2629 | index++; |
2630 | } | |
2631 | ||
2632 | if (session->ust_session != NULL) { | |
2633 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2634 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2635 | index++; |
3c6a091f | 2636 | |
e0a74f01 | 2637 | rcu_read_lock(); |
fefd409b DG |
2638 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2639 | agt, node.node) { | |
2640 | if (agt->being_used) { | |
2641 | (*domains)[index].type = agt->domain; | |
2642 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2643 | index++; | |
2644 | } | |
3c6a091f | 2645 | } |
e0a74f01 | 2646 | rcu_read_unlock(); |
2f77fc4b | 2647 | } |
fa64dfb4 | 2648 | end: |
2f77fc4b DG |
2649 | return nb_dom; |
2650 | ||
2651 | error: | |
f73fabfd DG |
2652 | /* Return negative value to differentiate return code */ |
2653 | return -ret; | |
2f77fc4b DG |
2654 | } |
2655 | ||
2656 | ||
2657 | /* | |
2658 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2659 | */ | |
2660 | ssize_t cmd_list_channels(int domain, struct ltt_session *session, | |
2661 | struct lttng_channel **channels) | |
2662 | { | |
2663 | int ret; | |
2664 | ssize_t nb_chan = 0; | |
2665 | ||
2666 | switch (domain) { | |
2667 | case LTTNG_DOMAIN_KERNEL: | |
2668 | if (session->kernel_session != NULL) { | |
2669 | nb_chan = session->kernel_session->channel_count; | |
2670 | } | |
2671 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 DG |
2672 | if (nb_chan <= 0) { |
2673 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; | |
2674 | } | |
2f77fc4b DG |
2675 | break; |
2676 | case LTTNG_DOMAIN_UST: | |
2677 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2678 | rcu_read_lock(); |
2f77fc4b | 2679 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2680 | session->ust_session->domain_global.channels); |
2681 | rcu_read_unlock(); | |
2f77fc4b DG |
2682 | } |
2683 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2684 | if (nb_chan < 0) { |
c7d620a2 | 2685 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
ade7ce52 | 2686 | goto error; |
c7d620a2 | 2687 | } |
2f77fc4b DG |
2688 | break; |
2689 | default: | |
f73fabfd | 2690 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2691 | goto error; |
2692 | } | |
2693 | ||
2694 | if (nb_chan > 0) { | |
2695 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
2696 | if (*channels == NULL) { | |
f73fabfd | 2697 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2698 | goto error; |
2699 | } | |
2700 | ||
2701 | list_lttng_channels(domain, session, *channels); | |
2f77fc4b DG |
2702 | } |
2703 | ||
2704 | return nb_chan; | |
2705 | ||
2706 | error: | |
f73fabfd DG |
2707 | /* Return negative value to differentiate return code */ |
2708 | return -ret; | |
2f77fc4b DG |
2709 | } |
2710 | ||
2711 | /* | |
2712 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2713 | */ | |
2714 | ssize_t cmd_list_events(int domain, struct ltt_session *session, | |
2715 | char *channel_name, struct lttng_event **events) | |
2716 | { | |
2717 | int ret = 0; | |
2718 | ssize_t nb_event = 0; | |
2719 | ||
2720 | switch (domain) { | |
2721 | case LTTNG_DOMAIN_KERNEL: | |
2722 | if (session->kernel_session != NULL) { | |
2723 | nb_event = list_lttng_kernel_events(channel_name, | |
2724 | session->kernel_session, events); | |
2725 | } | |
2726 | break; | |
2727 | case LTTNG_DOMAIN_UST: | |
2728 | { | |
2729 | if (session->ust_session != NULL) { | |
2730 | nb_event = list_lttng_ust_global_events(channel_name, | |
2731 | &session->ust_session->domain_global, events); | |
2732 | } | |
2733 | break; | |
2734 | } | |
5cdb6027 | 2735 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2736 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2737 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 2738 | if (session->ust_session) { |
fefd409b DG |
2739 | struct lttng_ht_iter iter; |
2740 | struct agent *agt; | |
2741 | ||
b11feea5 | 2742 | rcu_read_lock(); |
fefd409b DG |
2743 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
2744 | &iter.iter, agt, node.node) { | |
d8366880 JG |
2745 | if (agt->domain == domain) { |
2746 | nb_event = list_lttng_agent_events( | |
2747 | agt, events); | |
2748 | break; | |
2749 | } | |
fefd409b | 2750 | } |
b11feea5 | 2751 | rcu_read_unlock(); |
3c6a091f DG |
2752 | } |
2753 | break; | |
2f77fc4b | 2754 | default: |
f73fabfd | 2755 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2756 | goto error; |
2757 | } | |
2758 | ||
f73fabfd | 2759 | return nb_event; |
2f77fc4b DG |
2760 | |
2761 | error: | |
f73fabfd DG |
2762 | /* Return negative value to differentiate return code */ |
2763 | return -ret; | |
2f77fc4b DG |
2764 | } |
2765 | ||
2766 | /* | |
2767 | * Using the session list, filled a lttng_session array to send back to the | |
2768 | * client for session listing. | |
2769 | * | |
2770 | * The session list lock MUST be acquired before calling this function. Use | |
2771 | * session_lock_list() and session_unlock_list(). | |
2772 | */ | |
2773 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
2774 | gid_t gid) | |
2775 | { | |
2776 | int ret; | |
2777 | unsigned int i = 0; | |
2778 | struct ltt_session *session; | |
2779 | struct ltt_session_list *list = session_get_list(); | |
2780 | ||
2781 | DBG("Getting all available session for UID %d GID %d", | |
2782 | uid, gid); | |
2783 | /* | |
2784 | * Iterate over session list and append data after the control struct in | |
2785 | * the buffer. | |
2786 | */ | |
2787 | cds_list_for_each_entry(session, &list->head, list) { | |
2788 | /* | |
2789 | * Only list the sessions the user can control. | |
2790 | */ | |
2791 | if (!session_access_ok(session, uid, gid)) { | |
2792 | continue; | |
2793 | } | |
2794 | ||
2795 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2796 | struct ltt_ust_session *usess = session->ust_session; | |
2797 | ||
2798 | if (session->consumer->type == CONSUMER_DST_NET || | |
2799 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
2800 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
2801 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 2802 | sizeof(sessions[i].path), session); |
2f77fc4b | 2803 | } else { |
dec56f6c | 2804 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
2805 | session->consumer->dst.trace_path); |
2806 | } | |
2807 | if (ret < 0) { | |
2808 | PERROR("snprintf session path"); | |
2809 | continue; | |
2810 | } | |
2811 | ||
2812 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
2813 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 2814 | sessions[i].enabled = session->active; |
2cbf8fed | 2815 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 2816 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
2817 | i++; |
2818 | } | |
2819 | } | |
2820 | ||
806e2684 | 2821 | /* |
6d805429 | 2822 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 2823 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 2824 | */ |
6d805429 | 2825 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
2826 | { |
2827 | int ret; | |
2828 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2829 | struct ltt_ust_session *usess = session->ust_session; | |
2830 | ||
2831 | assert(session); | |
2832 | ||
2833 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 2834 | if (session->active) { |
806e2684 DG |
2835 | ret = LTTNG_ERR_SESSION_STARTED; |
2836 | goto error; | |
3a89d11a DG |
2837 | } else { |
2838 | /* | |
2839 | * If stopped, just make sure we've started before else the above call | |
2840 | * will always send that there is data pending. | |
2841 | * | |
2842 | * The consumer assumes that when the data pending command is received, | |
2843 | * the trace has been started before or else no output data is written | |
2844 | * by the streams which is a condition for data pending. So, this is | |
2845 | * *VERY* important that we don't ask the consumer before a start | |
2846 | * trace. | |
2847 | */ | |
8382cf6f | 2848 | if (!session->has_been_started) { |
3a89d11a DG |
2849 | ret = 0; |
2850 | goto error; | |
2851 | } | |
806e2684 DG |
2852 | } |
2853 | ||
2854 | if (ksess && ksess->consumer) { | |
6d805429 DG |
2855 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
2856 | if (ret == 1) { | |
806e2684 DG |
2857 | /* Data is still being extracted for the kernel. */ |
2858 | goto error; | |
2859 | } | |
2860 | } | |
2861 | ||
2862 | if (usess && usess->consumer) { | |
6d805429 DG |
2863 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
2864 | if (ret == 1) { | |
806e2684 DG |
2865 | /* Data is still being extracted for the kernel. */ |
2866 | goto error; | |
2867 | } | |
2868 | } | |
2869 | ||
2870 | /* Data is ready to be read by a viewer */ | |
6d805429 | 2871 | ret = 0; |
806e2684 DG |
2872 | |
2873 | error: | |
2874 | return ret; | |
2875 | } | |
2876 | ||
6dc3064a DG |
2877 | /* |
2878 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
2879 | * | |
2880 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
2881 | */ | |
2882 | int cmd_snapshot_add_output(struct ltt_session *session, | |
2883 | struct lttng_snapshot_output *output, uint32_t *id) | |
2884 | { | |
2885 | int ret; | |
2886 | struct snapshot_output *new_output; | |
2887 | ||
2888 | assert(session); | |
2889 | assert(output); | |
2890 | ||
2891 | DBG("Cmd snapshot add output for session %s", session->name); | |
2892 | ||
2893 | /* | |
d3f14b8a MD |
2894 | * Permission denied to create an output if the session is not |
2895 | * set in no output mode. | |
6dc3064a DG |
2896 | */ |
2897 | if (session->output_traces) { | |
2898 | ret = LTTNG_ERR_EPERM; | |
2899 | goto error; | |
2900 | } | |
2901 | ||
2902 | /* Only one output is allowed until we have the "tee" feature. */ | |
2903 | if (session->snapshot.nb_output == 1) { | |
2904 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
2905 | goto error; | |
2906 | } | |
2907 | ||
2908 | new_output = snapshot_output_alloc(); | |
2909 | if (!new_output) { | |
2910 | ret = LTTNG_ERR_NOMEM; | |
2911 | goto error; | |
2912 | } | |
2913 | ||
2914 | ret = snapshot_output_init(output->max_size, output->name, | |
2915 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
2916 | &session->snapshot); | |
2917 | if (ret < 0) { | |
2918 | if (ret == -ENOMEM) { | |
2919 | ret = LTTNG_ERR_NOMEM; | |
2920 | } else { | |
2921 | ret = LTTNG_ERR_INVALID; | |
2922 | } | |
2923 | goto free_error; | |
2924 | } | |
2925 | ||
6dc3064a DG |
2926 | rcu_read_lock(); |
2927 | snapshot_add_output(&session->snapshot, new_output); | |
2928 | if (id) { | |
2929 | *id = new_output->id; | |
2930 | } | |
2931 | rcu_read_unlock(); | |
2932 | ||
2933 | return LTTNG_OK; | |
2934 | ||
2935 | free_error: | |
2936 | snapshot_output_destroy(new_output); | |
2937 | error: | |
2938 | return ret; | |
2939 | } | |
2940 | ||
2941 | /* | |
2942 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
2943 | * | |
2944 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
2945 | */ | |
2946 | int cmd_snapshot_del_output(struct ltt_session *session, | |
2947 | struct lttng_snapshot_output *output) | |
2948 | { | |
2949 | int ret; | |
eb240553 | 2950 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
2951 | |
2952 | assert(session); | |
2953 | assert(output); | |
2954 | ||
6dc3064a DG |
2955 | rcu_read_lock(); |
2956 | ||
2957 | /* | |
d3f14b8a MD |
2958 | * Permission denied to create an output if the session is not |
2959 | * set in no output mode. | |
6dc3064a DG |
2960 | */ |
2961 | if (session->output_traces) { | |
2962 | ret = LTTNG_ERR_EPERM; | |
2963 | goto error; | |
2964 | } | |
2965 | ||
eb240553 DG |
2966 | if (output->id) { |
2967 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
2968 | session->name); | |
2969 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
2970 | } else if (*output->name != '\0') { | |
2971 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
2972 | session->name); | |
2973 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
2974 | } | |
6dc3064a DG |
2975 | if (!sout) { |
2976 | ret = LTTNG_ERR_INVALID; | |
2977 | goto error; | |
2978 | } | |
2979 | ||
2980 | snapshot_delete_output(&session->snapshot, sout); | |
2981 | snapshot_output_destroy(sout); | |
2982 | ret = LTTNG_OK; | |
2983 | ||
2984 | error: | |
2985 | rcu_read_unlock(); | |
2986 | return ret; | |
2987 | } | |
2988 | ||
2989 | /* | |
2990 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
2991 | * | |
2992 | * If no output is available, outputs is untouched and 0 is returned. | |
2993 | * | |
2994 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
2995 | */ | |
2996 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
2997 | struct lttng_snapshot_output **outputs) | |
2998 | { | |
2999 | int ret, idx = 0; | |
b223ca94 | 3000 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3001 | struct lttng_ht_iter iter; |
3002 | struct snapshot_output *output; | |
3003 | ||
3004 | assert(session); | |
3005 | assert(outputs); | |
3006 | ||
3007 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3008 | ||
3009 | /* | |
d3f14b8a MD |
3010 | * Permission denied to create an output if the session is not |
3011 | * set in no output mode. | |
6dc3064a DG |
3012 | */ |
3013 | if (session->output_traces) { | |
b223ca94 | 3014 | ret = -LTTNG_ERR_EPERM; |
6dc3064a DG |
3015 | goto error; |
3016 | } | |
3017 | ||
3018 | if (session->snapshot.nb_output == 0) { | |
3019 | ret = 0; | |
3020 | goto error; | |
3021 | } | |
3022 | ||
3023 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3024 | if (!list) { | |
b223ca94 | 3025 | ret = -LTTNG_ERR_NOMEM; |
6dc3064a DG |
3026 | goto error; |
3027 | } | |
3028 | ||
3029 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3030 | rcu_read_lock(); |
6dc3064a DG |
3031 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3032 | output, node.node) { | |
3033 | assert(output->consumer); | |
3034 | list[idx].id = output->id; | |
3035 | list[idx].max_size = output->max_size; | |
f02edd9e MD |
3036 | if (lttng_strncpy(list[idx].name, output->name, |
3037 | sizeof(list[idx].name))) { | |
3038 | ret = -LTTNG_ERR_INVALID; | |
a2fe8e46 | 3039 | goto error_unlock; |
f02edd9e | 3040 | } |
6dc3064a | 3041 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
f02edd9e MD |
3042 | if (lttng_strncpy(list[idx].ctrl_url, |
3043 | output->consumer->dst.trace_path, | |
3044 | sizeof(list[idx].ctrl_url))) { | |
3045 | ret = -LTTNG_ERR_INVALID; | |
a2fe8e46 | 3046 | goto error_unlock; |
f02edd9e | 3047 | } |
6dc3064a DG |
3048 | } else { |
3049 | /* Control URI. */ | |
3050 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3051 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3052 | if (ret < 0) { | |
b223ca94 | 3053 | ret = -LTTNG_ERR_NOMEM; |
a2fe8e46 | 3054 | goto error_unlock; |
6dc3064a DG |
3055 | } |
3056 | ||
3057 | /* Data URI. */ | |
3058 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3059 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3060 | if (ret < 0) { | |
b223ca94 | 3061 | ret = -LTTNG_ERR_NOMEM; |
a2fe8e46 | 3062 | goto error_unlock; |
6dc3064a DG |
3063 | } |
3064 | } | |
3065 | idx++; | |
3066 | } | |
3067 | ||
3068 | *outputs = list; | |
b223ca94 JG |
3069 | list = NULL; |
3070 | ret = session->snapshot.nb_output; | |
a2fe8e46 JG |
3071 | error_unlock: |
3072 | rcu_read_unlock(); | |
6dc3064a | 3073 | error: |
b223ca94 | 3074 | free(list); |
b223ca94 | 3075 | return ret; |
6dc3064a DG |
3076 | } |
3077 | ||
3078 | /* | |
3079 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3080 | * snapshot output is *not* set with a remote destination. | |
3081 | * | |
a934f4af | 3082 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3083 | */ |
3084 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3085 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3086 | { | |
a934f4af | 3087 | int ret = LTTNG_OK; |
6dc3064a DG |
3088 | struct lttng_ht_iter iter; |
3089 | struct consumer_socket *socket; | |
3090 | ||
3091 | assert(consumer); | |
3092 | assert(snap_output); | |
3093 | assert(session); | |
3094 | ||
3095 | DBG2("Set relayd object from snapshot output"); | |
3096 | ||
3097 | /* Ignore if snapshot consumer output is not network. */ | |
3098 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3099 | goto error; | |
3100 | } | |
3101 | ||
3102 | /* | |
3103 | * For each consumer socket, create and send the relayd object of the | |
3104 | * snapshot output. | |
3105 | */ | |
3106 | rcu_read_lock(); | |
5eecee74 DG |
3107 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3108 | socket, node.node) { | |
6dc3064a | 3109 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3110 | snap_output->consumer, socket, |
3111 | session->name, session->hostname, | |
3112 | session->live_timer); | |
a934f4af | 3113 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3114 | rcu_read_unlock(); |
3115 | goto error; | |
3116 | } | |
3117 | } | |
3118 | rcu_read_unlock(); | |
3119 | ||
3120 | error: | |
3121 | return ret; | |
3122 | } | |
3123 | ||
3124 | /* | |
3125 | * Record a kernel snapshot. | |
3126 | * | |
fac41e72 | 3127 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3128 | */ |
3129 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3130 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3131 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3132 | { |
3133 | int ret; | |
3134 | ||
3135 | assert(ksess); | |
3136 | assert(output); | |
3137 | assert(session); | |
3138 | ||
10a50311 | 3139 | |
af706bb7 DG |
3140 | /* |
3141 | * Copy kernel session sockets so we can communicate with the right | |
3142 | * consumer for the snapshot record command. | |
3143 | */ | |
3144 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3145 | if (ret < 0) { | |
a934f4af | 3146 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3147 | goto error; |
6dc3064a DG |
3148 | } |
3149 | ||
3150 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3151 | if (ret != LTTNG_OK) { |
af706bb7 | 3152 | goto error_snapshot; |
6dc3064a DG |
3153 | } |
3154 | ||
d07ceecd | 3155 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3156 | if (ret != LTTNG_OK) { |
af706bb7 | 3157 | goto error_snapshot; |
6dc3064a DG |
3158 | } |
3159 | ||
a934f4af | 3160 | ret = LTTNG_OK; |
1371fc12 | 3161 | goto end; |
a934f4af | 3162 | |
af706bb7 DG |
3163 | error_snapshot: |
3164 | /* Clean up copied sockets so this output can use some other later on. */ | |
3165 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3166 | error: |
1371fc12 | 3167 | end: |
6dc3064a DG |
3168 | return ret; |
3169 | } | |
3170 | ||
3171 | /* | |
3172 | * Record a UST snapshot. | |
3173 | * | |
a934f4af | 3174 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3175 | */ |
3176 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3177 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3178 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3179 | { |
3180 | int ret; | |
3181 | ||
3182 | assert(usess); | |
3183 | assert(output); | |
3184 | assert(session); | |
3185 | ||
af706bb7 | 3186 | /* |
d3f14b8a | 3187 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3188 | * consumer for the snapshot record command. |
3189 | */ | |
3190 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3191 | if (ret < 0) { | |
a934f4af | 3192 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3193 | goto error; |
6dc3064a DG |
3194 | } |
3195 | ||
3196 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3197 | if (ret != LTTNG_OK) { |
af706bb7 | 3198 | goto error_snapshot; |
6dc3064a DG |
3199 | } |
3200 | ||
d07ceecd | 3201 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3202 | if (ret < 0) { |
7badf927 DG |
3203 | switch (-ret) { |
3204 | case EINVAL: | |
a934f4af | 3205 | ret = LTTNG_ERR_INVALID; |
7badf927 | 3206 | break; |
7badf927 DG |
3207 | default: |
3208 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3209 | break; | |
5c786ded | 3210 | } |
af706bb7 | 3211 | goto error_snapshot; |
6dc3064a DG |
3212 | } |
3213 | ||
a934f4af DG |
3214 | ret = LTTNG_OK; |
3215 | ||
af706bb7 DG |
3216 | error_snapshot: |
3217 | /* Clean up copied sockets so this output can use some other later on. */ | |
3218 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3219 | error: |
3220 | return ret; | |
3221 | } | |
3222 | ||
d07ceecd MD |
3223 | static |
3224 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3225 | uint64_t cur_nr_packets) | |
68808f4e | 3226 | { |
d07ceecd | 3227 | uint64_t tot_size = 0; |
68808f4e DG |
3228 | |
3229 | if (session->kernel_session) { | |
3230 | struct ltt_kernel_channel *chan; | |
3231 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3232 | ||
68808f4e | 3233 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3234 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3235 | /* | |
3236 | * Don't take channel into account if we | |
3237 | * already grab all its packets. | |
3238 | */ | |
3239 | continue; | |
68808f4e | 3240 | } |
d07ceecd MD |
3241 | tot_size += chan->channel->attr.subbuf_size |
3242 | * chan->stream_count; | |
68808f4e DG |
3243 | } |
3244 | } | |
3245 | ||
3246 | if (session->ust_session) { | |
68808f4e DG |
3247 | struct ltt_ust_session *usess = session->ust_session; |
3248 | ||
d07ceecd MD |
3249 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3250 | cur_nr_packets); | |
68808f4e DG |
3251 | } |
3252 | ||
d07ceecd | 3253 | return tot_size; |
68808f4e DG |
3254 | } |
3255 | ||
5c786ded | 3256 | /* |
d07ceecd MD |
3257 | * Calculate the number of packets we can grab from each stream that |
3258 | * fits within the overall snapshot max size. | |
3259 | * | |
3260 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3261 | * the number of packets per stream. | |
3262 | * | |
3263 | * TODO: this approach is not perfect: we consider the worse case | |
3264 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3265 | * better if we do this calculation while we actually grab the packet | |
3266 | * content: we would know how much padding we don't actually store into | |
3267 | * the file. | |
3268 | * | |
3269 | * This algorithm is currently bounded by the number of packets per | |
3270 | * stream. | |
3271 | * | |
3272 | * Since we call this algorithm before actually grabbing the data, it's | |
3273 | * an approximation: for instance, applications could appear/disappear | |
3274 | * in between this call and actually grabbing data. | |
5c786ded | 3275 | */ |
d07ceecd MD |
3276 | static |
3277 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3278 | { |
d07ceecd MD |
3279 | int64_t size_left; |
3280 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3281 | |
d07ceecd MD |
3282 | if (!max_size) { |
3283 | return 0; /* Infinite */ | |
5c786ded JD |
3284 | } |
3285 | ||
d07ceecd MD |
3286 | size_left = max_size; |
3287 | for (;;) { | |
3288 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3289 | |
d07ceecd MD |
3290 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3291 | cur_nb_packets); | |
3292 | if (!one_more_packet_tot_size) { | |
3293 | /* We are already grabbing all packets. */ | |
3294 | break; | |
3295 | } | |
3296 | size_left -= one_more_packet_tot_size; | |
3297 | if (size_left < 0) { | |
3298 | break; | |
3299 | } | |
3300 | cur_nb_packets++; | |
5c786ded | 3301 | } |
d07ceecd MD |
3302 | if (!cur_nb_packets) { |
3303 | /* Not enough room to grab one packet of each stream, error. */ | |
3304 | return -1; | |
3305 | } | |
3306 | return cur_nb_packets; | |
5c786ded JD |
3307 | } |
3308 | ||
6dc3064a DG |
3309 | /* |
3310 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3311 | * | |
3312 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3313 | * complete before returning. | |
3314 | * | |
3315 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3316 | */ | |
3317 | int cmd_snapshot_record(struct ltt_session *session, | |
3318 | struct lttng_snapshot_output *output, int wait) | |
3319 | { | |
3320 | int ret = LTTNG_OK; | |
e1986656 DG |
3321 | unsigned int use_tmp_output = 0; |
3322 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3323 | unsigned int snapshot_success = 0; |
02208dd5 | 3324 | char datetime[16]; |
6dc3064a DG |
3325 | |
3326 | assert(session); | |
ba45d9f0 | 3327 | assert(output); |
6dc3064a DG |
3328 | |
3329 | DBG("Cmd snapshot record for session %s", session->name); | |
3330 | ||
02208dd5 JR |
3331 | /* Get the datetime for the snapshot output directory. */ |
3332 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
3333 | sizeof(datetime)); | |
3334 | if (!ret) { | |
3335 | ret = LTTNG_ERR_INVALID; | |
3336 | goto error; | |
3337 | } | |
3338 | ||
6dc3064a | 3339 | /* |
d3f14b8a MD |
3340 | * Permission denied to create an output if the session is not |
3341 | * set in no output mode. | |
6dc3064a DG |
3342 | */ |
3343 | if (session->output_traces) { | |
3344 | ret = LTTNG_ERR_EPERM; | |
3345 | goto error; | |
3346 | } | |
3347 | ||
3348 | /* The session needs to be started at least once. */ | |
8382cf6f | 3349 | if (!session->has_been_started) { |
6dc3064a DG |
3350 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3351 | goto error; | |
3352 | } | |
3353 | ||
3354 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3355 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3356 | ret = snapshot_output_init(output->max_size, output->name, |
3357 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3358 | &tmp_output, NULL); |
6dc3064a DG |
3359 | if (ret < 0) { |
3360 | if (ret == -ENOMEM) { | |
3361 | ret = LTTNG_ERR_NOMEM; | |
3362 | } else { | |
3363 | ret = LTTNG_ERR_INVALID; | |
3364 | } | |
3365 | goto error; | |
3366 | } | |
1bfe7328 DG |
3367 | /* Use the global session count for the temporary snapshot. */ |
3368 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
02208dd5 JR |
3369 | |
3370 | /* Use the global datetime */ | |
3371 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); | |
e1986656 | 3372 | use_tmp_output = 1; |
6dc3064a DG |
3373 | } |
3374 | ||
b7bd3009 JR |
3375 | if (use_tmp_output) { |
3376 | int64_t nb_packets_per_stream; | |
6dc3064a | 3377 | |
b7bd3009 JR |
3378 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3379 | tmp_output.max_size); | |
3380 | if (nb_packets_per_stream < 0) { | |
3381 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3382 | goto error; | |
3383 | } | |
d07ceecd | 3384 | |
b7bd3009 JR |
3385 | if (session->kernel_session) { |
3386 | ret = record_kernel_snapshot(session->kernel_session, | |
3387 | &tmp_output, session, | |
3388 | wait, nb_packets_per_stream); | |
3389 | if (ret != LTTNG_OK) { | |
d07ceecd MD |
3390 | goto error; |
3391 | } | |
b7bd3009 JR |
3392 | } |
3393 | ||
3394 | if (session->ust_session) { | |
3395 | ret = record_ust_snapshot(session->ust_session, | |
3396 | &tmp_output, session, | |
d07ceecd | 3397 | wait, nb_packets_per_stream); |
a934f4af | 3398 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3399 | goto error; |
3400 | } | |
b7bd3009 | 3401 | } |
e1986656 | 3402 | |
b7bd3009 JR |
3403 | snapshot_success = 1; |
3404 | } else { | |
3405 | struct snapshot_output *sout; | |
3406 | struct lttng_ht_iter iter; | |
68808f4e | 3407 | |
b7bd3009 JR |
3408 | rcu_read_lock(); |
3409 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3410 | &iter.iter, sout, node.node) { | |
3411 | int64_t nb_packets_per_stream; | |
e1986656 | 3412 | |
b7bd3009 JR |
3413 | /* |
3414 | * Make a local copy of the output and assign the possible | |
3415 | * temporary value given by the caller. | |
3416 | */ | |
3417 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3418 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
1bfe7328 | 3419 | |
b7bd3009 JR |
3420 | if (output->max_size != (uint64_t) -1ULL) { |
3421 | tmp_output.max_size = output->max_size; | |
6dc3064a | 3422 | } |
d07ceecd MD |
3423 | |
3424 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3425 | tmp_output.max_size); | |
3426 | if (nb_packets_per_stream < 0) { | |
3427 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
b7bd3009 | 3428 | rcu_read_unlock(); |
d07ceecd MD |
3429 | goto error; |
3430 | } | |
6dc3064a | 3431 | |
b7bd3009 JR |
3432 | /* Use temporary name. */ |
3433 | if (*output->name != '\0') { | |
9977104c MD |
3434 | if (lttng_strncpy(tmp_output.name, output->name, |
3435 | sizeof(tmp_output.name))) { | |
3436 | ret = LTTNG_ERR_INVALID; | |
3437 | rcu_read_unlock(); | |
3438 | goto error; | |
3439 | } | |
b7bd3009 | 3440 | } |
e1986656 | 3441 | |
b7bd3009 | 3442 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
02208dd5 | 3443 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); |
e1986656 | 3444 | |
b7bd3009 JR |
3445 | if (session->kernel_session) { |
3446 | ret = record_kernel_snapshot(session->kernel_session, | |
3447 | &tmp_output, session, | |
3448 | wait, nb_packets_per_stream); | |
3449 | if (ret != LTTNG_OK) { | |
d07ceecd | 3450 | rcu_read_unlock(); |
68808f4e DG |
3451 | goto error; |
3452 | } | |
b7bd3009 | 3453 | } |
68808f4e | 3454 | |
b7bd3009 JR |
3455 | if (session->ust_session) { |
3456 | ret = record_ust_snapshot(session->ust_session, | |
3457 | &tmp_output, session, | |
d07ceecd | 3458 | wait, nb_packets_per_stream); |
a934f4af | 3459 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3460 | rcu_read_unlock(); |
3461 | goto error; | |
3462 | } | |
3463 | } | |
b7bd3009 | 3464 | snapshot_success = 1; |
6dc3064a | 3465 | } |
b7bd3009 | 3466 | rcu_read_unlock(); |
6dc3064a DG |
3467 | } |
3468 | ||
1bfe7328 DG |
3469 | if (snapshot_success) { |
3470 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
3471 | } else { |
3472 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
3473 | } |
3474 | ||
6dc3064a | 3475 | error: |
6dc3064a DG |
3476 | return ret; |
3477 | } | |
3478 | ||
d7ba1388 MD |
3479 | /* |
3480 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
3481 | */ | |
3482 | int cmd_set_session_shm_path(struct ltt_session *session, | |
3483 | const char *shm_path) | |
3484 | { | |
3485 | /* Safety net */ | |
3486 | assert(session); | |
3487 | ||
3488 | /* | |
3489 | * Can only set shm path before session is started. | |
3490 | */ | |
3491 | if (session->has_been_started) { | |
3492 | return LTTNG_ERR_SESSION_STARTED; | |
3493 | } | |
3494 | ||
3495 | strncpy(session->shm_path, shm_path, | |
3496 | sizeof(session->shm_path)); | |
3497 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
3498 | ||
3499 | return 0; | |
3500 | } | |
3501 | ||
2f77fc4b DG |
3502 | /* |
3503 | * Init command subsystem. | |
3504 | */ | |
3505 | void cmd_init(void) | |
3506 | { | |
3507 | /* | |
d88aee68 DG |
3508 | * Set network sequence index to 1 for streams to match a relayd |
3509 | * socket on the consumer side. | |
2f77fc4b | 3510 | */ |
d88aee68 DG |
3511 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
3512 | relayd_net_seq_idx = 1; | |
3513 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
3514 | |
3515 | DBG("Command subsystem initialized"); | |
3516 | } |