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 | ||
33fbd469 DG |
1071 | /* |
1072 | * The ringbuffer (both in user space and kernel) behave badly in overwrite | |
1073 | * mode and with less than 2 subbuf so block it right away and send back an | |
1074 | * invalid attribute error. | |
1075 | */ | |
1076 | if (attr->attr.overwrite && attr->attr.num_subbuf < 2) { | |
1077 | ret = LTTNG_ERR_INVALID; | |
1078 | goto error; | |
1079 | } | |
1080 | ||
7972aab2 | 1081 | switch (domain->type) { |
2f77fc4b DG |
1082 | case LTTNG_DOMAIN_KERNEL: |
1083 | { | |
1084 | struct ltt_kernel_channel *kchan; | |
1085 | ||
2f77fc4b DG |
1086 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1087 | session->kernel_session); | |
1088 | if (kchan == NULL) { | |
1089 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1090 | if (attr->name[0] != '\0') { |
1091 | session->kernel_session->has_non_default_channel = 1; | |
1092 | } | |
2f77fc4b DG |
1093 | } else { |
1094 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1095 | } | |
1096 | ||
f73fabfd | 1097 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1098 | goto error; |
1099 | } | |
1100 | ||
784303b0 | 1101 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1102 | break; |
1103 | } | |
1104 | case LTTNG_DOMAIN_UST: | |
ab24e525 JG |
1105 | case LTTNG_DOMAIN_JUL: |
1106 | case LTTNG_DOMAIN_LOG4J: | |
1107 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1108 | { |
1109 | struct ltt_ust_channel *uchan; | |
1110 | ||
ab24e525 JG |
1111 | /* |
1112 | * FIXME | |
1113 | * | |
1114 | * Current agent implementation limitations force us to allow | |
1115 | * only one channel at once in "agent" subdomains. Each | |
1116 | * subdomain has a default channel name which must be strictly | |
1117 | * adhered to. | |
1118 | */ | |
1119 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1120 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1121 | LTTNG_SYMBOL_NAME_LEN)) { | |
1122 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1123 | goto error; | |
1124 | } | |
1125 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1126 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1127 | LTTNG_SYMBOL_NAME_LEN)) { | |
1128 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1129 | goto error; | |
1130 | } | |
1131 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1132 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1133 | LTTNG_SYMBOL_NAME_LEN)) { | |
1134 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1135 | goto error; | |
1136 | } | |
1137 | } | |
1138 | ||
2f77fc4b DG |
1139 | chan_ht = usess->domain_global.channels; |
1140 | ||
1141 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1142 | if (uchan == NULL) { | |
7972aab2 | 1143 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1144 | if (attr->name[0] != '\0') { |
1145 | usess->has_non_default_channel = 1; | |
1146 | } | |
2f77fc4b | 1147 | } else { |
7972aab2 | 1148 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1149 | } |
1150 | break; | |
1151 | } | |
2f77fc4b | 1152 | default: |
f73fabfd | 1153 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1154 | goto error; |
1155 | } | |
1156 | ||
1157 | error: | |
2223c96f | 1158 | rcu_read_unlock(); |
1f345e94 | 1159 | end: |
2f77fc4b DG |
1160 | return ret; |
1161 | } | |
1162 | ||
2f77fc4b DG |
1163 | /* |
1164 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1165 | */ | |
1166 | int cmd_disable_event(struct ltt_session *session, int domain, | |
6e911cad MD |
1167 | char *channel_name, |
1168 | struct lttng_event *event) | |
2f77fc4b DG |
1169 | { |
1170 | int ret; | |
6e911cad MD |
1171 | char *event_name; |
1172 | ||
18a720cd MD |
1173 | DBG("Disable event command for event \'%s\'", event->name); |
1174 | ||
6e911cad | 1175 | event_name = event->name; |
1290b5d8 JG |
1176 | if (validate_event_name(event_name)) { |
1177 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1178 | goto error; | |
1179 | } | |
6e911cad | 1180 | |
9b7431cf JG |
1181 | /* Error out on unhandled search criteria */ |
1182 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1183 | || event->pid || event->filter || event->exclusion) { |
1290b5d8 JG |
1184 | ret = LTTNG_ERR_UNK; |
1185 | goto error; | |
6e911cad | 1186 | } |
2f77fc4b | 1187 | |
2223c96f DG |
1188 | rcu_read_lock(); |
1189 | ||
2f77fc4b DG |
1190 | switch (domain) { |
1191 | case LTTNG_DOMAIN_KERNEL: | |
1192 | { | |
1193 | struct ltt_kernel_channel *kchan; | |
1194 | struct ltt_kernel_session *ksess; | |
1195 | ||
1196 | ksess = session->kernel_session; | |
1197 | ||
85076754 MD |
1198 | /* |
1199 | * If a non-default channel has been created in the | |
1200 | * session, explicitely require that -c chan_name needs | |
1201 | * to be provided. | |
1202 | */ | |
1203 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1204 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1290b5d8 | 1205 | goto error_unlock; |
85076754 MD |
1206 | } |
1207 | ||
2f77fc4b DG |
1208 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1209 | if (kchan == NULL) { | |
f73fabfd | 1210 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
1290b5d8 | 1211 | goto error_unlock; |
2f77fc4b DG |
1212 | } |
1213 | ||
6e911cad MD |
1214 | switch (event->type) { |
1215 | case LTTNG_EVENT_ALL: | |
6ed2fd39 | 1216 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1217 | case LTTNG_EVENT_SYSCALL: |
6ed2fd39 JR |
1218 | case LTTNG_EVENT_PROBE: |
1219 | case LTTNG_EVENT_FUNCTION: | |
1220 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1221 | if (event_name[0] == '\0') { | |
1222 | ret = event_kernel_disable_event(kchan, | |
1223 | NULL, event->type); | |
29c62722 | 1224 | } else { |
d0ae4ea8 | 1225 | ret = event_kernel_disable_event(kchan, |
6ed2fd39 | 1226 | event_name, event->type); |
29c62722 | 1227 | } |
6e911cad | 1228 | if (ret != LTTNG_OK) { |
1290b5d8 | 1229 | goto error_unlock; |
6e911cad MD |
1230 | } |
1231 | break; | |
6e911cad MD |
1232 | default: |
1233 | ret = LTTNG_ERR_UNK; | |
1290b5d8 | 1234 | goto error_unlock; |
2f77fc4b DG |
1235 | } |
1236 | ||
1237 | kernel_wait_quiescent(kernel_tracer_fd); | |
1238 | break; | |
1239 | } | |
1240 | case LTTNG_DOMAIN_UST: | |
1241 | { | |
1242 | struct ltt_ust_channel *uchan; | |
1243 | struct ltt_ust_session *usess; | |
1244 | ||
1245 | usess = session->ust_session; | |
1246 | ||
1290b5d8 JG |
1247 | if (validate_ust_event_name(event_name)) { |
1248 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1249 | goto error_unlock; | |
1250 | } | |
1251 | ||
85076754 MD |
1252 | /* |
1253 | * If a non-default channel has been created in the | |
6ed2fd39 | 1254 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1255 | * to be provided. |
1256 | */ | |
1257 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1258 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1290b5d8 | 1259 | goto error_unlock; |
85076754 MD |
1260 | } |
1261 | ||
2f77fc4b DG |
1262 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1263 | channel_name); | |
1264 | if (uchan == NULL) { | |
f73fabfd | 1265 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
1290b5d8 | 1266 | goto error_unlock; |
2f77fc4b DG |
1267 | } |
1268 | ||
6e911cad MD |
1269 | switch (event->type) { |
1270 | case LTTNG_EVENT_ALL: | |
82ba26e9 JR |
1271 | /* |
1272 | * An empty event name means that everything | |
1273 | * should be disabled. | |
1274 | */ | |
1275 | if (event->name[0] == '\0') { | |
1276 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
8bee8347 JR |
1277 | } else { |
1278 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1279 | event_name); | |
1280 | } | |
6e911cad | 1281 | if (ret != LTTNG_OK) { |
1290b5d8 | 1282 | goto error_unlock; |
6e911cad MD |
1283 | } |
1284 | break; | |
1285 | default: | |
1286 | ret = LTTNG_ERR_UNK; | |
1290b5d8 | 1287 | goto error_unlock; |
2f77fc4b DG |
1288 | } |
1289 | ||
1290 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1291 | channel_name); | |
1292 | break; | |
1293 | } | |
5cdb6027 | 1294 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1295 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1296 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1297 | { |
fefd409b | 1298 | struct agent *agt; |
f20baf8e DG |
1299 | struct ltt_ust_session *usess = session->ust_session; |
1300 | ||
1301 | assert(usess); | |
1302 | ||
6e911cad MD |
1303 | switch (event->type) { |
1304 | case LTTNG_EVENT_ALL: | |
1305 | break; | |
1306 | default: | |
1307 | ret = LTTNG_ERR_UNK; | |
1290b5d8 | 1308 | goto error_unlock; |
6e911cad MD |
1309 | } |
1310 | ||
5cdb6027 | 1311 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1312 | if (!agt) { |
1313 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
1290b5d8 | 1314 | goto error_unlock; |
fefd409b | 1315 | } |
82ba26e9 JR |
1316 | /* |
1317 | * An empty event name means that everything | |
1318 | * should be disabled. | |
1319 | */ | |
1320 | if (event->name[0] == '\0') { | |
18a720cd MD |
1321 | ret = event_agent_disable_all(usess, agt); |
1322 | } else { | |
1323 | ret = event_agent_disable(usess, agt, event_name); | |
1324 | } | |
f20baf8e | 1325 | if (ret != LTTNG_OK) { |
1290b5d8 | 1326 | goto error_unlock; |
f20baf8e DG |
1327 | } |
1328 | ||
1329 | break; | |
1330 | } | |
2f77fc4b | 1331 | default: |
f73fabfd | 1332 | ret = LTTNG_ERR_UND; |
1290b5d8 | 1333 | goto error_unlock; |
2f77fc4b DG |
1334 | } |
1335 | ||
f73fabfd | 1336 | ret = LTTNG_OK; |
2f77fc4b | 1337 | |
1290b5d8 | 1338 | error_unlock: |
2223c96f | 1339 | rcu_read_unlock(); |
1290b5d8 | 1340 | error: |
2f77fc4b DG |
1341 | return ret; |
1342 | } | |
1343 | ||
2f77fc4b DG |
1344 | /* |
1345 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1346 | */ | |
1347 | int cmd_add_context(struct ltt_session *session, int domain, | |
601d5acf | 1348 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1349 | { |
d5979e4a | 1350 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
2f77fc4b DG |
1351 | |
1352 | switch (domain) { | |
1353 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1354 | assert(session->kernel_session); |
1355 | ||
1356 | if (session->kernel_session->channel_count == 0) { | |
1357 | /* Create default channel */ | |
1358 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1359 | if (ret != LTTNG_OK) { | |
1360 | goto error; | |
1361 | } | |
d5979e4a | 1362 | chan_kern_created = 1; |
979e618e | 1363 | } |
2f77fc4b | 1364 | /* Add kernel context to kernel tracer */ |
601d5acf | 1365 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1366 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1367 | goto error; |
1368 | } | |
1369 | break; | |
1370 | case LTTNG_DOMAIN_UST: | |
1371 | { | |
1372 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1373 | unsigned int chan_count; |
1374 | ||
2f77fc4b DG |
1375 | assert(usess); |
1376 | ||
85076754 | 1377 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1378 | if (chan_count == 0) { |
1379 | struct lttng_channel *attr; | |
1380 | /* Create default channel */ | |
0a9c6494 | 1381 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1382 | if (attr == NULL) { |
1383 | ret = LTTNG_ERR_FATAL; | |
1384 | goto error; | |
1385 | } | |
1386 | ||
7972aab2 | 1387 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1388 | if (ret != LTTNG_OK) { |
1389 | free(attr); | |
1390 | goto error; | |
1391 | } | |
1392 | free(attr); | |
d5979e4a | 1393 | chan_ust_created = 1; |
979e618e DG |
1394 | } |
1395 | ||
601d5acf | 1396 | ret = context_ust_add(usess, domain, ctx, channel_name); |
f73fabfd | 1397 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1398 | goto error; |
1399 | } | |
1400 | break; | |
1401 | } | |
2f77fc4b | 1402 | default: |
f73fabfd | 1403 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1404 | goto error; |
1405 | } | |
1406 | ||
d5979e4a | 1407 | return LTTNG_OK; |
2f77fc4b DG |
1408 | |
1409 | error: | |
d5979e4a DG |
1410 | if (chan_kern_created) { |
1411 | struct ltt_kernel_channel *kchan = | |
1412 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1413 | session->kernel_session); | |
1414 | /* Created previously, this should NOT fail. */ | |
1415 | assert(kchan); | |
1416 | kernel_destroy_channel(kchan); | |
1417 | } | |
1418 | ||
1419 | if (chan_ust_created) { | |
1420 | struct ltt_ust_channel *uchan = | |
1421 | trace_ust_find_channel_by_name( | |
1422 | session->ust_session->domain_global.channels, | |
1423 | DEFAULT_CHANNEL_NAME); | |
1424 | /* Created previously, this should NOT fail. */ | |
1425 | assert(uchan); | |
1426 | /* Remove from the channel list of the session. */ | |
1427 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1428 | uchan); | |
1429 | trace_ust_destroy_channel(uchan); | |
1430 | } | |
2f77fc4b DG |
1431 | return ret; |
1432 | } | |
1433 | ||
930a2e99 JG |
1434 | static int validate_event_name(const char *name) |
1435 | { | |
1436 | int ret = 0; | |
1437 | const char *c = name; | |
1438 | const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN; | |
1439 | ||
1440 | /* | |
1441 | * Make sure that unescaped wildcards are only used as the last | |
1442 | * character of the event name. | |
1443 | */ | |
1444 | while (c < event_name_end) { | |
1445 | switch (*c) { | |
1446 | case '\0': | |
1447 | goto end; | |
1448 | case '\\': | |
1449 | c++; | |
1450 | break; | |
1451 | case '*': | |
1452 | if ((c + 1) < event_name_end && *(c + 1)) { | |
1453 | /* Wildcard is not the last character */ | |
1454 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1455 | goto end; | |
1456 | } | |
1457 | default: | |
1458 | break; | |
1459 | } | |
1460 | c++; | |
1461 | } | |
1462 | end: | |
1463 | return ret; | |
1464 | } | |
1465 | ||
c8100299 JG |
1466 | static inline bool name_starts_with(const char *name, const char *prefix) |
1467 | { | |
1468 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1469 | ||
1470 | return !strncmp(name, prefix, max_cmp_len); | |
1471 | } | |
1472 | ||
1473 | /* Perform userspace-specific event name validation */ | |
1474 | static int validate_ust_event_name(const char *name) | |
1475 | { | |
1476 | int ret = 0; | |
1477 | ||
1478 | if (!name) { | |
1479 | ret = -1; | |
1480 | goto end; | |
1481 | } | |
1482 | ||
1483 | /* | |
1484 | * Check name against all internal UST event component namespaces used | |
1485 | * by the agents. | |
1486 | */ | |
1487 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1488 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1489 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1490 | ret = -1; | |
1491 | } | |
1492 | ||
1493 | end: | |
1494 | return ret; | |
1495 | } | |
9732459c | 1496 | |
2f77fc4b | 1497 | /* |
9732459c JG |
1498 | * Internal version of cmd_enable_event() with a supplemental |
1499 | * "internal_event" flag which is used to enable internal events which should | |
1500 | * be hidden from clients. Such events are used in the agent implementation to | |
1501 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1502 | */ |
9732459c JG |
1503 | static int _cmd_enable_event(struct ltt_session *session, |
1504 | struct lttng_domain *domain, | |
025faf73 | 1505 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1506 | char *filter_expression, |
db8f1377 JI |
1507 | struct lttng_filter_bytecode *filter, |
1508 | struct lttng_event_exclusion *exclusion, | |
9732459c | 1509 | int wpipe, bool internal_event) |
2f77fc4b | 1510 | { |
e5f5db7f | 1511 | int ret, channel_created = 0; |
2f77fc4b DG |
1512 | struct lttng_channel *attr; |
1513 | ||
1514 | assert(session); | |
1515 | assert(event); | |
1516 | assert(channel_name); | |
1517 | ||
18a720cd MD |
1518 | DBG("Enable event command for event \'%s\'", event->name); |
1519 | ||
57dc4ef3 MD |
1520 | rcu_read_lock(); |
1521 | ||
930a2e99 JG |
1522 | ret = validate_event_name(event->name); |
1523 | if (ret) { | |
1524 | goto error; | |
1525 | } | |
1526 | ||
7972aab2 | 1527 | switch (domain->type) { |
2f77fc4b DG |
1528 | case LTTNG_DOMAIN_KERNEL: |
1529 | { | |
1530 | struct ltt_kernel_channel *kchan; | |
1531 | ||
85076754 MD |
1532 | /* |
1533 | * If a non-default channel has been created in the | |
1534 | * session, explicitely require that -c chan_name needs | |
1535 | * to be provided. | |
1536 | */ | |
1537 | if (session->kernel_session->has_non_default_channel | |
1538 | && channel_name[0] == '\0') { | |
1539 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1540 | goto error; | |
1541 | } | |
1542 | ||
2f77fc4b DG |
1543 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1544 | session->kernel_session); | |
1545 | if (kchan == NULL) { | |
0a9c6494 DG |
1546 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1547 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1548 | if (attr == NULL) { |
f73fabfd | 1549 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1550 | goto error; |
1551 | } | |
0425a2b2 MD |
1552 | if (lttng_strncpy(attr->name, channel_name, |
1553 | sizeof(attr->name))) { | |
1554 | ret = LTTNG_ERR_INVALID; | |
1555 | free(attr); | |
1556 | goto error; | |
1557 | } | |
2f77fc4b DG |
1558 | |
1559 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1560 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1561 | free(attr); |
1562 | goto error; | |
1563 | } | |
1564 | free(attr); | |
e5f5db7f DG |
1565 | |
1566 | channel_created = 1; | |
2f77fc4b DG |
1567 | } |
1568 | ||
1569 | /* Get the newly created kernel channel pointer */ | |
1570 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1571 | session->kernel_session); | |
1572 | if (kchan == NULL) { | |
1573 | /* This sould not happen... */ | |
f73fabfd | 1574 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1575 | goto error; |
1576 | } | |
1577 | ||
6e911cad MD |
1578 | switch (event->type) { |
1579 | case LTTNG_EVENT_ALL: | |
29c62722 | 1580 | { |
00a62084 MD |
1581 | char *filter_expression_a = NULL; |
1582 | struct lttng_filter_bytecode *filter_a = NULL; | |
1583 | ||
1584 | /* | |
1585 | * We need to duplicate filter_expression and filter, | |
1586 | * because ownership is passed to first enable | |
1587 | * event. | |
1588 | */ | |
1589 | if (filter_expression) { | |
1590 | filter_expression_a = strdup(filter_expression); | |
1591 | if (!filter_expression_a) { | |
1592 | ret = LTTNG_ERR_FATAL; | |
1593 | goto error; | |
1594 | } | |
1595 | } | |
1596 | if (filter) { | |
1597 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1598 | if (!filter_a) { | |
1599 | free(filter_expression_a); | |
1600 | ret = LTTNG_ERR_FATAL; | |
1601 | goto error; | |
1602 | } | |
1603 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1604 | } | |
29c62722 | 1605 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1606 | ret = event_kernel_enable_event(kchan, event, |
1607 | filter_expression, filter); | |
a969e101 MD |
1608 | /* We have passed ownership */ |
1609 | filter_expression = NULL; | |
1610 | filter = NULL; | |
29c62722 MD |
1611 | if (ret != LTTNG_OK) { |
1612 | if (channel_created) { | |
1613 | /* Let's not leak a useless channel. */ | |
1614 | kernel_destroy_channel(kchan); | |
1615 | } | |
00a62084 MD |
1616 | free(filter_expression_a); |
1617 | free(filter_a); | |
29c62722 MD |
1618 | goto error; |
1619 | } | |
1620 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1621 | ret = event_kernel_enable_event(kchan, event, |
1622 | filter_expression_a, filter_a); | |
0217a5a1 AB |
1623 | /* We have passed ownership */ |
1624 | filter_expression_a = NULL; | |
1625 | filter_a = NULL; | |
29c62722 MD |
1626 | if (ret != LTTNG_OK) { |
1627 | goto error; | |
1628 | } | |
1629 | break; | |
1630 | } | |
6e6ef3d7 DG |
1631 | case LTTNG_EVENT_PROBE: |
1632 | case LTTNG_EVENT_FUNCTION: | |
1633 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1634 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
1635 | ret = event_kernel_enable_event(kchan, event, |
1636 | filter_expression, filter); | |
a969e101 MD |
1637 | /* We have passed ownership */ |
1638 | filter_expression = NULL; | |
1639 | filter = NULL; | |
6e911cad MD |
1640 | if (ret != LTTNG_OK) { |
1641 | if (channel_created) { | |
1642 | /* Let's not leak a useless channel. */ | |
1643 | kernel_destroy_channel(kchan); | |
1644 | } | |
1645 | goto error; | |
e5f5db7f | 1646 | } |
6e911cad MD |
1647 | break; |
1648 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1649 | ret = event_kernel_enable_event(kchan, event, |
1650 | filter_expression, filter); | |
a969e101 MD |
1651 | /* We have passed ownership */ |
1652 | filter_expression = NULL; | |
1653 | filter = NULL; | |
e2b957af MD |
1654 | if (ret != LTTNG_OK) { |
1655 | goto error; | |
1656 | } | |
6e911cad MD |
1657 | break; |
1658 | default: | |
1659 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1660 | goto error; |
1661 | } | |
1662 | ||
1663 | kernel_wait_quiescent(kernel_tracer_fd); | |
1664 | break; | |
1665 | } | |
1666 | case LTTNG_DOMAIN_UST: | |
1667 | { | |
1668 | struct ltt_ust_channel *uchan; | |
1669 | struct ltt_ust_session *usess = session->ust_session; | |
1670 | ||
1671 | assert(usess); | |
1672 | ||
85076754 MD |
1673 | /* |
1674 | * If a non-default channel has been created in the | |
1675 | * session, explicitely require that -c chan_name needs | |
1676 | * to be provided. | |
1677 | */ | |
1678 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1679 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1680 | goto error; | |
1681 | } | |
1682 | ||
2f77fc4b DG |
1683 | /* Get channel from global UST domain */ |
1684 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1685 | channel_name); | |
1686 | if (uchan == NULL) { | |
1687 | /* Create default channel */ | |
0a9c6494 DG |
1688 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
1689 | usess->buffer_type); | |
2f77fc4b | 1690 | if (attr == NULL) { |
f73fabfd | 1691 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1692 | goto error; |
1693 | } | |
0425a2b2 MD |
1694 | if (lttng_strncpy(attr->name, channel_name, |
1695 | sizeof(attr->name))) { | |
1696 | ret = LTTNG_ERR_INVALID; | |
1697 | free(attr); | |
1698 | goto error; | |
1699 | } | |
2f77fc4b DG |
1700 | |
1701 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1702 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1703 | free(attr); |
1704 | goto error; | |
1705 | } | |
1706 | free(attr); | |
1707 | ||
1708 | /* Get the newly created channel reference back */ | |
1709 | uchan = trace_ust_find_channel_by_name( | |
1710 | usess->domain_global.channels, channel_name); | |
1711 | assert(uchan); | |
1712 | } | |
1713 | ||
9ab6d7ea JG |
1714 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
1715 | /* | |
1716 | * Don't allow users to add UST events to channels which | |
1717 | * are assigned to a userspace subdomain (JUL, Log4J, | |
1718 | * Python, etc.). | |
1719 | */ | |
1720 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
1721 | goto error; | |
1722 | } | |
1723 | ||
c8100299 JG |
1724 | if (!internal_event) { |
1725 | /* | |
1726 | * Ensure the event name is not reserved for internal | |
1727 | * use. | |
1728 | */ | |
1729 | ret = validate_ust_event_name(event->name); | |
1730 | if (ret) { | |
1731 | WARN("Userspace event name %s failed validation.", | |
1732 | event->name ? | |
1733 | event->name : "NULL"); | |
1734 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1735 | goto error; | |
1736 | } | |
1737 | } | |
1738 | ||
2f77fc4b | 1739 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 1740 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
9732459c JG |
1741 | filter_expression, filter, exclusion, |
1742 | internal_event); | |
49d21f93 MD |
1743 | /* We have passed ownership */ |
1744 | filter_expression = NULL; | |
1745 | filter = NULL; | |
1746 | exclusion = NULL; | |
85f2f68c JG |
1747 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
1748 | goto already_enabled; | |
1749 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
1750 | goto error; |
1751 | } | |
1752 | break; | |
1753 | } | |
5cdb6027 | 1754 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1755 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1756 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1757 | { |
da6c3a50 | 1758 | const char *default_event_name, *default_chan_name; |
fefd409b | 1759 | struct agent *agt; |
f20baf8e DG |
1760 | struct lttng_event uevent; |
1761 | struct lttng_domain tmp_dom; | |
1762 | struct ltt_ust_session *usess = session->ust_session; | |
1763 | ||
1764 | assert(usess); | |
1765 | ||
5cdb6027 | 1766 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 1767 | if (!agt) { |
5cdb6027 | 1768 | agt = agent_create(domain->type); |
fefd409b | 1769 | if (!agt) { |
948f8adb | 1770 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
1771 | goto error; |
1772 | } | |
1773 | agent_add(agt, usess->agents); | |
1774 | } | |
1775 | ||
022d91ba | 1776 | /* Create the default tracepoint. */ |
996de3c7 | 1777 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
1778 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
1779 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
0a3fca4d JG |
1780 | default_event_name = event_get_default_agent_ust_name( |
1781 | domain->type); | |
da6c3a50 | 1782 | if (!default_event_name) { |
948f8adb | 1783 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 1784 | goto error; |
f43f95a9 | 1785 | } |
da6c3a50 | 1786 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
1787 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
1788 | ||
1789 | /* | |
1790 | * The domain type is changed because we are about to enable the | |
1791 | * default channel and event for the JUL domain that are hardcoded. | |
1792 | * This happens in the UST domain. | |
1793 | */ | |
1794 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
1795 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
1796 | ||
0e115563 DG |
1797 | switch (domain->type) { |
1798 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 1799 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
1800 | break; |
1801 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 1802 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
1803 | break; |
1804 | case LTTNG_DOMAIN_PYTHON: | |
1805 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
1806 | break; | |
1807 | default: | |
1808 | /* The switch/case we are in should avoid this else big problem */ | |
1809 | assert(0); | |
da6c3a50 DG |
1810 | } |
1811 | ||
971da06a | 1812 | { |
d75bffee | 1813 | char *filter_expression_copy = NULL; |
0a3fca4d | 1814 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
1815 | |
1816 | if (filter) { | |
0a3fca4d JG |
1817 | const size_t filter_size = sizeof( |
1818 | struct lttng_filter_bytecode) | |
1819 | + filter->len; | |
1820 | ||
1821 | filter_copy = zmalloc(filter_size); | |
971da06a | 1822 | if (!filter_copy) { |
a745883a | 1823 | ret = LTTNG_ERR_NOMEM; |
4c579b1f | 1824 | goto error; |
971da06a | 1825 | } |
0a3fca4d | 1826 | memcpy(filter_copy, filter, filter_size); |
971da06a | 1827 | |
d75bffee JG |
1828 | filter_expression_copy = |
1829 | strdup(filter_expression); | |
1830 | if (!filter_expression) { | |
1831 | ret = LTTNG_ERR_NOMEM; | |
0a3fca4d JG |
1832 | } |
1833 | ||
1834 | if (!filter_expression_copy || !filter_copy) { | |
1835 | free(filter_expression_copy); | |
1836 | free(filter_copy); | |
1837 | goto error; | |
d75bffee | 1838 | } |
971da06a JG |
1839 | } |
1840 | ||
9732459c | 1841 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 1842 | (char *) default_chan_name, |
d75bffee JG |
1843 | &uevent, filter_expression_copy, |
1844 | filter_copy, NULL, wpipe); | |
971da06a JG |
1845 | } |
1846 | ||
85f2f68c JG |
1847 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
1848 | goto already_enabled; | |
1849 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
1850 | goto error; |
1851 | } | |
1852 | ||
1853 | /* The wild card * means that everything should be enabled. */ | |
1854 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
d75bffee JG |
1855 | ret = event_agent_enable_all(usess, agt, event, filter, |
1856 | filter_expression); | |
f20baf8e | 1857 | } else { |
d75bffee JG |
1858 | ret = event_agent_enable(usess, agt, event, filter, |
1859 | filter_expression); | |
f20baf8e | 1860 | } |
0a3fca4d JG |
1861 | filter = NULL; |
1862 | filter_expression = NULL; | |
f20baf8e DG |
1863 | if (ret != LTTNG_OK) { |
1864 | goto error; | |
1865 | } | |
1866 | ||
1867 | break; | |
1868 | } | |
2f77fc4b | 1869 | default: |
f73fabfd | 1870 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1871 | goto error; |
1872 | } | |
1873 | ||
f73fabfd | 1874 | ret = LTTNG_OK; |
2f77fc4b | 1875 | |
85f2f68c | 1876 | already_enabled: |
2f77fc4b | 1877 | error: |
49d21f93 MD |
1878 | free(filter_expression); |
1879 | free(filter); | |
1880 | free(exclusion); | |
2223c96f | 1881 | rcu_read_unlock(); |
2f77fc4b DG |
1882 | return ret; |
1883 | } | |
1884 | ||
9732459c JG |
1885 | /* |
1886 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
1887 | * We own filter, exclusion, and filter_expression. | |
1888 | */ | |
1889 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
1890 | char *channel_name, struct lttng_event *event, | |
1891 | char *filter_expression, | |
1892 | struct lttng_filter_bytecode *filter, | |
1893 | struct lttng_event_exclusion *exclusion, | |
1894 | int wpipe) | |
1895 | { | |
1896 | return _cmd_enable_event(session, domain, channel_name, event, | |
1897 | filter_expression, filter, exclusion, wpipe, false); | |
1898 | } | |
1899 | ||
1900 | /* | |
1901 | * Enable an event which is internal to LTTng. An internal should | |
1902 | * never be made visible to clients and are immune to checks such as | |
1903 | * reserved names. | |
1904 | */ | |
1905 | static int cmd_enable_event_internal(struct ltt_session *session, | |
1906 | struct lttng_domain *domain, | |
1907 | char *channel_name, struct lttng_event *event, | |
1908 | char *filter_expression, | |
1909 | struct lttng_filter_bytecode *filter, | |
1910 | struct lttng_event_exclusion *exclusion, | |
1911 | int wpipe) | |
1912 | { | |
1913 | return _cmd_enable_event(session, domain, channel_name, event, | |
1914 | filter_expression, filter, exclusion, wpipe, true); | |
1915 | } | |
1916 | ||
2f77fc4b DG |
1917 | /* |
1918 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
1919 | */ | |
1920 | ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
1921 | { | |
1922 | int ret; | |
1923 | ssize_t nb_events = 0; | |
1924 | ||
1925 | switch (domain) { | |
1926 | case LTTNG_DOMAIN_KERNEL: | |
1927 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
1928 | if (nb_events < 0) { | |
f73fabfd | 1929 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
1930 | goto error; |
1931 | } | |
1932 | break; | |
1933 | case LTTNG_DOMAIN_UST: | |
1934 | nb_events = ust_app_list_events(events); | |
1935 | if (nb_events < 0) { | |
f73fabfd | 1936 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
1937 | goto error; |
1938 | } | |
1939 | break; | |
5cdb6027 | 1940 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 1941 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1942 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 1943 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
1944 | if (nb_events < 0) { |
1945 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
1946 | goto error; | |
1947 | } | |
1948 | break; | |
2f77fc4b | 1949 | default: |
f73fabfd | 1950 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1951 | goto error; |
1952 | } | |
1953 | ||
1954 | return nb_events; | |
1955 | ||
1956 | error: | |
1957 | /* Return negative value to differentiate return code */ | |
1958 | return -ret; | |
1959 | } | |
1960 | ||
1961 | /* | |
1962 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
1963 | */ | |
1964 | ssize_t cmd_list_tracepoint_fields(int domain, | |
1965 | struct lttng_event_field **fields) | |
1966 | { | |
1967 | int ret; | |
1968 | ssize_t nb_fields = 0; | |
1969 | ||
1970 | switch (domain) { | |
1971 | case LTTNG_DOMAIN_UST: | |
1972 | nb_fields = ust_app_list_event_fields(fields); | |
1973 | if (nb_fields < 0) { | |
f73fabfd | 1974 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
1975 | goto error; |
1976 | } | |
1977 | break; | |
1978 | case LTTNG_DOMAIN_KERNEL: | |
1979 | default: /* fall-through */ | |
f73fabfd | 1980 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1981 | goto error; |
1982 | } | |
1983 | ||
1984 | return nb_fields; | |
1985 | ||
1986 | error: | |
1987 | /* Return negative value to differentiate return code */ | |
1988 | return -ret; | |
1989 | } | |
1990 | ||
834978fd DG |
1991 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
1992 | { | |
1993 | return syscall_table_list(events); | |
1994 | } | |
1995 | ||
a5dfbb9d MD |
1996 | /* |
1997 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
1998 | * | |
1999 | * Called with session lock held. | |
2000 | */ | |
2001 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
2002 | int domain, int32_t **pids) | |
2003 | { | |
2004 | int ret; | |
2005 | ssize_t nr_pids = 0; | |
2006 | ||
2007 | switch (domain) { | |
2008 | case LTTNG_DOMAIN_KERNEL: | |
2009 | { | |
2010 | struct ltt_kernel_session *ksess; | |
2011 | ||
2012 | ksess = session->kernel_session; | |
2013 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2014 | if (nr_pids < 0) { | |
2015 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2016 | goto error; | |
2017 | } | |
2018 | break; | |
2019 | } | |
2020 | case LTTNG_DOMAIN_UST: | |
2021 | { | |
2022 | struct ltt_ust_session *usess; | |
2023 | ||
2024 | usess = session->ust_session; | |
2025 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2026 | if (nr_pids < 0) { | |
2027 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2028 | goto error; | |
2029 | } | |
2030 | break; | |
2031 | } | |
2032 | case LTTNG_DOMAIN_LOG4J: | |
2033 | case LTTNG_DOMAIN_JUL: | |
2034 | case LTTNG_DOMAIN_PYTHON: | |
2035 | default: | |
2036 | ret = LTTNG_ERR_UND; | |
2037 | goto error; | |
2038 | } | |
2039 | ||
2040 | return nr_pids; | |
2041 | ||
2042 | error: | |
2043 | /* Return negative value to differentiate return code */ | |
2044 | return -ret; | |
2045 | } | |
2046 | ||
2f77fc4b DG |
2047 | /* |
2048 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2049 | * |
2050 | * Called with session mutex held. | |
2f77fc4b DG |
2051 | */ |
2052 | int cmd_start_trace(struct ltt_session *session) | |
2053 | { | |
2054 | int ret; | |
cde3e505 | 2055 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2056 | struct ltt_kernel_session *ksession; |
2057 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2058 | |
2059 | assert(session); | |
2060 | ||
2061 | /* Ease our life a bit ;) */ | |
2062 | ksession = session->kernel_session; | |
2063 | usess = session->ust_session; | |
2064 | ||
8382cf6f DG |
2065 | /* Is the session already started? */ |
2066 | if (session->active) { | |
f73fabfd | 2067 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2068 | goto error; |
2069 | } | |
2070 | ||
cde3e505 DG |
2071 | /* |
2072 | * Starting a session without channel is useless since after that it's not | |
2073 | * possible to enable channel thus inform the client. | |
2074 | */ | |
2075 | if (usess && usess->domain_global.channels) { | |
a9e41044 | 2076 | rcu_read_lock(); |
cde3e505 | 2077 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); |
a9e41044 | 2078 | rcu_read_unlock(); |
cde3e505 DG |
2079 | } |
2080 | if (ksession) { | |
2081 | nb_chan += ksession->channel_count; | |
2082 | } | |
2083 | if (!nb_chan) { | |
2084 | ret = LTTNG_ERR_NO_CHANNEL; | |
2085 | goto error; | |
2086 | } | |
2087 | ||
2f77fc4b DG |
2088 | /* Kernel tracing */ |
2089 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2090 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2091 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2092 | goto error; |
2093 | } | |
2f77fc4b DG |
2094 | } |
2095 | ||
2096 | /* Flag session that trace should start automatically */ | |
2097 | if (usess) { | |
14fb1ebe DG |
2098 | /* |
2099 | * Even though the start trace might fail, flag this session active so | |
2100 | * other application coming in are started by default. | |
2101 | */ | |
2102 | usess->active = 1; | |
2f77fc4b DG |
2103 | |
2104 | ret = ust_app_start_trace_all(usess); | |
2105 | if (ret < 0) { | |
f73fabfd | 2106 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2107 | goto error; |
2108 | } | |
2109 | } | |
2110 | ||
8382cf6f DG |
2111 | /* Flag this after a successful start. */ |
2112 | session->has_been_started = 1; | |
2113 | session->active = 1; | |
9b6c7ec5 | 2114 | |
f73fabfd | 2115 | ret = LTTNG_OK; |
2f77fc4b DG |
2116 | |
2117 | error: | |
2118 | return ret; | |
2119 | } | |
2120 | ||
2121 | /* | |
2122 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2123 | */ | |
2124 | int cmd_stop_trace(struct ltt_session *session) | |
2125 | { | |
2126 | int ret; | |
2127 | struct ltt_kernel_channel *kchan; | |
2128 | struct ltt_kernel_session *ksession; | |
2129 | struct ltt_ust_session *usess; | |
2130 | ||
2131 | assert(session); | |
2132 | ||
2133 | /* Short cut */ | |
2134 | ksession = session->kernel_session; | |
2135 | usess = session->ust_session; | |
2136 | ||
8382cf6f DG |
2137 | /* Session is not active. Skip everythong and inform the client. */ |
2138 | if (!session->active) { | |
f73fabfd | 2139 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2140 | goto error; |
2141 | } | |
2142 | ||
2f77fc4b | 2143 | /* Kernel tracer */ |
14fb1ebe | 2144 | if (ksession && ksession->active) { |
2f77fc4b DG |
2145 | DBG("Stop kernel tracing"); |
2146 | ||
64a269c3 MD |
2147 | ret = kernel_stop_session(ksession); |
2148 | if (ret < 0) { | |
2149 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
2150 | goto error; | |
2151 | } | |
2152 | ||
2153 | kernel_wait_quiescent(kernel_tracer_fd); | |
2154 | ||
2155 | /* Flush metadata after stopping (if exists) */ | |
2f77fc4b DG |
2156 | if (ksession->metadata_stream_fd >= 0) { |
2157 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2158 | if (ret < 0) { | |
2159 | ERR("Kernel metadata flush failed"); | |
2160 | } | |
2161 | } | |
2162 | ||
64a269c3 | 2163 | /* Flush all buffers after stopping */ |
2f77fc4b DG |
2164 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2165 | ret = kernel_flush_buffer(kchan); | |
2166 | if (ret < 0) { | |
2167 | ERR("Kernel flush buffer error"); | |
2168 | } | |
2169 | } | |
2170 | ||
14fb1ebe | 2171 | ksession->active = 0; |
2f77fc4b DG |
2172 | } |
2173 | ||
14fb1ebe DG |
2174 | if (usess && usess->active) { |
2175 | /* | |
2176 | * Even though the stop trace might fail, flag this session inactive so | |
2177 | * other application coming in are not started by default. | |
2178 | */ | |
2179 | usess->active = 0; | |
2f77fc4b DG |
2180 | |
2181 | ret = ust_app_stop_trace_all(usess); | |
2182 | if (ret < 0) { | |
f73fabfd | 2183 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2184 | goto error; |
2185 | } | |
2186 | } | |
2187 | ||
8382cf6f DG |
2188 | /* Flag inactive after a successful stop. */ |
2189 | session->active = 0; | |
f73fabfd | 2190 | ret = LTTNG_OK; |
2f77fc4b DG |
2191 | |
2192 | error: | |
2193 | return ret; | |
2194 | } | |
2195 | ||
2196 | /* | |
2197 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2198 | */ | |
bda32d56 JG |
2199 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2200 | struct lttng_uri *uris) | |
2f77fc4b DG |
2201 | { |
2202 | int ret, i; | |
2203 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2204 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2205 | |
2206 | assert(session); | |
2207 | assert(uris); | |
2208 | assert(nb_uri > 0); | |
2209 | ||
8382cf6f DG |
2210 | /* Can't set consumer URI if the session is active. */ |
2211 | if (session->active) { | |
f73fabfd | 2212 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2213 | goto error; |
2214 | } | |
2215 | ||
bda32d56 | 2216 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2217 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2218 | ret = add_uri_to_consumer(session->consumer, |
2219 | &uris[i], 0, session->name); | |
a74934ba | 2220 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2221 | goto error; |
2222 | } | |
2f77fc4b DG |
2223 | } |
2224 | ||
bda32d56 JG |
2225 | /* Set UST session URIs */ |
2226 | if (session->ust_session) { | |
2227 | for (i = 0; i < nb_uri; i++) { | |
2228 | ret = add_uri_to_consumer( | |
2229 | session->ust_session->consumer, | |
2230 | &uris[i], LTTNG_DOMAIN_UST, | |
2231 | session->name); | |
2232 | if (ret != LTTNG_OK) { | |
2233 | goto error; | |
2234 | } | |
2235 | } | |
2236 | } | |
2237 | ||
2238 | /* Set kernel session URIs */ | |
2239 | if (session->kernel_session) { | |
2240 | for (i = 0; i < nb_uri; i++) { | |
2241 | ret = add_uri_to_consumer( | |
2242 | session->kernel_session->consumer, | |
2243 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2244 | session->name); | |
2245 | if (ret != LTTNG_OK) { | |
2246 | goto error; | |
2247 | } | |
2248 | } | |
2249 | } | |
2250 | ||
7ab70fe0 DG |
2251 | /* |
2252 | * Make sure to set the session in output mode after we set URI since a | |
2253 | * session can be created without URL (thus flagged in no output mode). | |
2254 | */ | |
2255 | session->output_traces = 1; | |
2256 | if (ksess) { | |
2257 | ksess->output_traces = 1; | |
bda32d56 JG |
2258 | } |
2259 | ||
2260 | if (usess) { | |
7ab70fe0 DG |
2261 | usess->output_traces = 1; |
2262 | } | |
2263 | ||
2f77fc4b | 2264 | /* All good! */ |
f73fabfd | 2265 | ret = LTTNG_OK; |
2f77fc4b DG |
2266 | |
2267 | error: | |
2268 | return ret; | |
2269 | } | |
2270 | ||
2271 | /* | |
2272 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2273 | */ | |
2274 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2275 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2276 | { |
2277 | int ret; | |
2f77fc4b DG |
2278 | struct ltt_session *session; |
2279 | ||
2280 | assert(name); | |
2bba9e53 | 2281 | assert(creds); |
785d2d0d | 2282 | |
2f77fc4b DG |
2283 | /* |
2284 | * Verify if the session already exist | |
2285 | * | |
2286 | * XXX: There is no need for the session lock list here since the caller | |
2287 | * (process_client_msg) is holding it. We might want to change that so a | |
2288 | * single command does not lock the entire session list. | |
2289 | */ | |
2290 | session = session_find_by_name(name); | |
2291 | if (session != NULL) { | |
f73fabfd | 2292 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2293 | goto find_error; |
2294 | } | |
2295 | ||
2296 | /* Create tracing session in the registry */ | |
dec56f6c | 2297 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2298 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2299 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2300 | goto session_error; |
2301 | } | |
2302 | ||
2303 | /* | |
2304 | * Get the newly created session pointer back | |
2305 | * | |
2306 | * XXX: There is no need for the session lock list here since the caller | |
2307 | * (process_client_msg) is holding it. We might want to change that so a | |
2308 | * single command does not lock the entire session list. | |
2309 | */ | |
2310 | session = session_find_by_name(name); | |
2311 | assert(session); | |
2312 | ||
ecc48a90 | 2313 | session->live_timer = live_timer; |
2f77fc4b DG |
2314 | /* Create default consumer output for the session not yet created. */ |
2315 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2316 | if (session->consumer == NULL) { | |
f73fabfd | 2317 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2318 | goto consumer_error; |
2319 | } | |
2320 | ||
2bba9e53 | 2321 | if (uris) { |
bda32d56 | 2322 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2323 | if (ret != LTTNG_OK) { |
2324 | goto consumer_error; | |
2325 | } | |
2326 | session->output_traces = 1; | |
2327 | } else { | |
2328 | session->output_traces = 0; | |
2329 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2330 | } |
2331 | ||
2332 | session->consumer->enabled = 1; | |
2333 | ||
f73fabfd | 2334 | return LTTNG_OK; |
2f77fc4b DG |
2335 | |
2336 | consumer_error: | |
2337 | session_destroy(session); | |
2338 | session_error: | |
2339 | find_error: | |
2340 | return ret; | |
2341 | } | |
2342 | ||
27babd3a DG |
2343 | /* |
2344 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2345 | */ | |
2346 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2347 | size_t nb_uri, lttng_sock_cred *creds) | |
2348 | { | |
2349 | int ret; | |
2350 | struct ltt_session *session; | |
2351 | struct snapshot_output *new_output = NULL; | |
2352 | ||
2353 | assert(name); | |
2354 | assert(creds); | |
2355 | ||
2356 | /* | |
2357 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2358 | * received are for a default snapshot output if one. | |
2359 | */ | |
bfaba83f | 2360 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2361 | if (ret != LTTNG_OK) { |
2362 | goto error; | |
2363 | } | |
2364 | ||
2365 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2366 | session = session_find_by_name(name); | |
2367 | assert(session); | |
2368 | ||
2369 | /* Flag session for snapshot mode. */ | |
2370 | session->snapshot_mode = 1; | |
2371 | ||
2372 | /* Skip snapshot output creation if no URI is given. */ | |
2373 | if (nb_uri == 0) { | |
2374 | goto end; | |
2375 | } | |
2376 | ||
2377 | new_output = snapshot_output_alloc(); | |
2378 | if (!new_output) { | |
2379 | ret = LTTNG_ERR_NOMEM; | |
2380 | goto error_snapshot_alloc; | |
2381 | } | |
2382 | ||
2383 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2384 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2385 | if (ret < 0) { | |
2386 | if (ret == -ENOMEM) { | |
2387 | ret = LTTNG_ERR_NOMEM; | |
2388 | } else { | |
2389 | ret = LTTNG_ERR_INVALID; | |
2390 | } | |
2391 | goto error_snapshot; | |
2392 | } | |
2393 | ||
2394 | rcu_read_lock(); | |
2395 | snapshot_add_output(&session->snapshot, new_output); | |
2396 | rcu_read_unlock(); | |
2397 | ||
2398 | end: | |
2399 | return LTTNG_OK; | |
2400 | ||
2401 | error_snapshot: | |
2402 | snapshot_output_destroy(new_output); | |
2403 | error_snapshot_alloc: | |
2404 | session_destroy(session); | |
2405 | error: | |
2406 | return ret; | |
2407 | } | |
2408 | ||
2f77fc4b DG |
2409 | /* |
2410 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2411 | * |
2412 | * Called with session lock held. | |
2f77fc4b DG |
2413 | */ |
2414 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2415 | { | |
2416 | int ret; | |
2417 | struct ltt_ust_session *usess; | |
2418 | struct ltt_kernel_session *ksess; | |
2419 | ||
2420 | /* Safety net */ | |
2421 | assert(session); | |
2422 | ||
2423 | usess = session->ust_session; | |
2424 | ksess = session->kernel_session; | |
2425 | ||
2426 | /* Clean kernel session teardown */ | |
2427 | kernel_destroy_session(ksess); | |
2428 | ||
2429 | /* UST session teardown */ | |
2430 | if (usess) { | |
2431 | /* Close any relayd session */ | |
2432 | consumer_output_send_destroy_relayd(usess->consumer); | |
2433 | ||
2434 | /* Destroy every UST application related to this session. */ | |
2435 | ret = ust_app_destroy_trace_all(usess); | |
2436 | if (ret) { | |
2437 | ERR("Error in ust_app_destroy_trace_all"); | |
2438 | } | |
2439 | ||
2440 | /* Clean up the rest. */ | |
2441 | trace_ust_destroy_session(usess); | |
2442 | } | |
2443 | ||
2444 | /* | |
2445 | * Must notify the kernel thread here to update it's poll set in order to | |
2446 | * remove the channel(s)' fd just destroyed. | |
2447 | */ | |
2448 | ret = notify_thread_pipe(wpipe); | |
2449 | if (ret < 0) { | |
2450 | PERROR("write kernel poll pipe"); | |
2451 | } | |
2452 | ||
2453 | ret = session_destroy(session); | |
2454 | ||
2455 | return ret; | |
2456 | } | |
2457 | ||
2458 | /* | |
2459 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2460 | */ | |
2461 | int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2462 | { | |
2463 | int ret; | |
2464 | ||
2465 | switch (domain) { | |
2466 | case LTTNG_DOMAIN_KERNEL: | |
2467 | { | |
2468 | struct lttng_kernel_calibrate kcalibrate; | |
2469 | ||
2e84128e DG |
2470 | switch (calibrate->type) { |
2471 | case LTTNG_CALIBRATE_FUNCTION: | |
2472 | default: | |
2473 | /* Default and only possible calibrate option. */ | |
2474 | kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE; | |
2475 | break; | |
2476 | } | |
2477 | ||
2f77fc4b DG |
2478 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); |
2479 | if (ret < 0) { | |
f73fabfd | 2480 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2f77fc4b DG |
2481 | goto error; |
2482 | } | |
2483 | break; | |
2484 | } | |
2485 | case LTTNG_DOMAIN_UST: | |
2486 | { | |
2487 | struct lttng_ust_calibrate ucalibrate; | |
2488 | ||
2e84128e DG |
2489 | switch (calibrate->type) { |
2490 | case LTTNG_CALIBRATE_FUNCTION: | |
2491 | default: | |
2492 | /* Default and only possible calibrate option. */ | |
2493 | ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT; | |
2494 | break; | |
2495 | } | |
2496 | ||
2f77fc4b DG |
2497 | ret = ust_app_calibrate_glb(&ucalibrate); |
2498 | if (ret < 0) { | |
f73fabfd | 2499 | ret = LTTNG_ERR_UST_CALIBRATE_FAIL; |
2f77fc4b DG |
2500 | goto error; |
2501 | } | |
2502 | break; | |
2503 | } | |
2504 | default: | |
f73fabfd | 2505 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2506 | goto error; |
2507 | } | |
2508 | ||
f73fabfd | 2509 | ret = LTTNG_OK; |
2f77fc4b DG |
2510 | |
2511 | error: | |
2512 | return ret; | |
2513 | } | |
2514 | ||
2515 | /* | |
2516 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2517 | */ | |
2518 | int cmd_register_consumer(struct ltt_session *session, int domain, | |
2519 | const char *sock_path, struct consumer_data *cdata) | |
2520 | { | |
2521 | int ret, sock; | |
dd81b457 | 2522 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2523 | |
2524 | assert(session); | |
2525 | assert(cdata); | |
2526 | assert(sock_path); | |
2527 | ||
2528 | switch (domain) { | |
2529 | case LTTNG_DOMAIN_KERNEL: | |
2530 | { | |
2531 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2532 | ||
2533 | assert(ksess); | |
2534 | ||
2535 | /* Can't register a consumer if there is already one */ | |
2536 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2537 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2538 | goto error; |
2539 | } | |
2540 | ||
2541 | sock = lttcomm_connect_unix_sock(sock_path); | |
2542 | if (sock < 0) { | |
f73fabfd | 2543 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2544 | goto error; |
2545 | } | |
4ce514c4 | 2546 | cdata->cmd_sock = sock; |
2f77fc4b | 2547 | |
4ce514c4 | 2548 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2549 | if (socket == NULL) { |
f66c074c DG |
2550 | ret = close(sock); |
2551 | if (ret < 0) { | |
2552 | PERROR("close register consumer"); | |
2553 | } | |
4ce514c4 | 2554 | cdata->cmd_sock = -1; |
f73fabfd | 2555 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2556 | goto error; |
2557 | } | |
2558 | ||
2559 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2560 | if (socket->lock == NULL) { | |
2561 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2562 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2563 | goto error; |
2564 | } | |
2565 | pthread_mutex_init(socket->lock, NULL); | |
2566 | socket->registered = 1; | |
2567 | ||
2568 | rcu_read_lock(); | |
2569 | consumer_add_socket(socket, ksess->consumer); | |
2570 | rcu_read_unlock(); | |
2571 | ||
2572 | pthread_mutex_lock(&cdata->pid_mutex); | |
2573 | cdata->pid = -1; | |
2574 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2575 | ||
2576 | break; | |
2577 | } | |
2578 | default: | |
2579 | /* TODO: Userspace tracing */ | |
f73fabfd | 2580 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2581 | goto error; |
2582 | } | |
2583 | ||
dd81b457 | 2584 | return LTTNG_OK; |
2f77fc4b DG |
2585 | |
2586 | error: | |
dd81b457 DG |
2587 | if (socket) { |
2588 | consumer_destroy_socket(socket); | |
2589 | } | |
2f77fc4b DG |
2590 | return ret; |
2591 | } | |
2592 | ||
2593 | /* | |
2594 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2595 | */ | |
2596 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2597 | struct lttng_domain **domains) | |
2598 | { | |
2599 | int ret, index = 0; | |
2600 | ssize_t nb_dom = 0; | |
fefd409b DG |
2601 | struct agent *agt; |
2602 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2603 | |
2604 | if (session->kernel_session != NULL) { | |
2605 | DBG3("Listing domains found kernel domain"); | |
2606 | nb_dom++; | |
2607 | } | |
2608 | ||
2609 | if (session->ust_session != NULL) { | |
2610 | DBG3("Listing domains found UST global domain"); | |
2611 | nb_dom++; | |
3c6a091f | 2612 | |
e0a74f01 | 2613 | rcu_read_lock(); |
fefd409b DG |
2614 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2615 | agt, node.node) { | |
2616 | if (agt->being_used) { | |
2617 | nb_dom++; | |
2618 | } | |
3c6a091f | 2619 | } |
e0a74f01 | 2620 | rcu_read_unlock(); |
2f77fc4b DG |
2621 | } |
2622 | ||
fa64dfb4 JG |
2623 | if (!nb_dom) { |
2624 | goto end; | |
2625 | } | |
2626 | ||
2f77fc4b DG |
2627 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2628 | if (*domains == NULL) { | |
f73fabfd | 2629 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2630 | goto error; |
2631 | } | |
2632 | ||
2633 | if (session->kernel_session != NULL) { | |
2634 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
bd3381e3 PP |
2635 | |
2636 | /* Kernel session buffer type is always GLOBAL */ | |
2637 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2638 | ||
2f77fc4b DG |
2639 | index++; |
2640 | } | |
2641 | ||
2642 | if (session->ust_session != NULL) { | |
2643 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2644 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2645 | index++; |
3c6a091f | 2646 | |
e0a74f01 | 2647 | rcu_read_lock(); |
fefd409b DG |
2648 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2649 | agt, node.node) { | |
2650 | if (agt->being_used) { | |
2651 | (*domains)[index].type = agt->domain; | |
2652 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2653 | index++; | |
2654 | } | |
3c6a091f | 2655 | } |
e0a74f01 | 2656 | rcu_read_unlock(); |
2f77fc4b | 2657 | } |
fa64dfb4 | 2658 | end: |
2f77fc4b DG |
2659 | return nb_dom; |
2660 | ||
2661 | error: | |
f73fabfd DG |
2662 | /* Return negative value to differentiate return code */ |
2663 | return -ret; | |
2f77fc4b DG |
2664 | } |
2665 | ||
2666 | ||
2667 | /* | |
2668 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2669 | */ | |
2670 | ssize_t cmd_list_channels(int domain, struct ltt_session *session, | |
2671 | struct lttng_channel **channels) | |
2672 | { | |
2673 | int ret; | |
2674 | ssize_t nb_chan = 0; | |
2675 | ||
2676 | switch (domain) { | |
2677 | case LTTNG_DOMAIN_KERNEL: | |
2678 | if (session->kernel_session != NULL) { | |
2679 | nb_chan = session->kernel_session->channel_count; | |
2680 | } | |
2681 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 DG |
2682 | if (nb_chan <= 0) { |
2683 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; | |
2684 | } | |
2f77fc4b DG |
2685 | break; |
2686 | case LTTNG_DOMAIN_UST: | |
2687 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2688 | rcu_read_lock(); |
2f77fc4b | 2689 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2690 | session->ust_session->domain_global.channels); |
2691 | rcu_read_unlock(); | |
2f77fc4b DG |
2692 | } |
2693 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2694 | if (nb_chan < 0) { |
c7d620a2 | 2695 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
ade7ce52 | 2696 | goto error; |
c7d620a2 | 2697 | } |
2f77fc4b DG |
2698 | break; |
2699 | default: | |
f73fabfd | 2700 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2701 | goto error; |
2702 | } | |
2703 | ||
2704 | if (nb_chan > 0) { | |
2705 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
2706 | if (*channels == NULL) { | |
f73fabfd | 2707 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2708 | goto error; |
2709 | } | |
2710 | ||
2711 | list_lttng_channels(domain, session, *channels); | |
2f77fc4b DG |
2712 | } |
2713 | ||
2714 | return nb_chan; | |
2715 | ||
2716 | error: | |
f73fabfd DG |
2717 | /* Return negative value to differentiate return code */ |
2718 | return -ret; | |
2f77fc4b DG |
2719 | } |
2720 | ||
2721 | /* | |
2722 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2723 | */ | |
2724 | ssize_t cmd_list_events(int domain, struct ltt_session *session, | |
2725 | char *channel_name, struct lttng_event **events) | |
2726 | { | |
2727 | int ret = 0; | |
2728 | ssize_t nb_event = 0; | |
2729 | ||
2730 | switch (domain) { | |
2731 | case LTTNG_DOMAIN_KERNEL: | |
2732 | if (session->kernel_session != NULL) { | |
2733 | nb_event = list_lttng_kernel_events(channel_name, | |
2734 | session->kernel_session, events); | |
2735 | } | |
2736 | break; | |
2737 | case LTTNG_DOMAIN_UST: | |
2738 | { | |
2739 | if (session->ust_session != NULL) { | |
2740 | nb_event = list_lttng_ust_global_events(channel_name, | |
2741 | &session->ust_session->domain_global, events); | |
2742 | } | |
2743 | break; | |
2744 | } | |
5cdb6027 | 2745 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2746 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2747 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 2748 | if (session->ust_session) { |
fefd409b DG |
2749 | struct lttng_ht_iter iter; |
2750 | struct agent *agt; | |
2751 | ||
b11feea5 | 2752 | rcu_read_lock(); |
fefd409b DG |
2753 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
2754 | &iter.iter, agt, node.node) { | |
d8366880 JG |
2755 | if (agt->domain == domain) { |
2756 | nb_event = list_lttng_agent_events( | |
2757 | agt, events); | |
2758 | break; | |
2759 | } | |
fefd409b | 2760 | } |
b11feea5 | 2761 | rcu_read_unlock(); |
3c6a091f DG |
2762 | } |
2763 | break; | |
2f77fc4b | 2764 | default: |
f73fabfd | 2765 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2766 | goto error; |
2767 | } | |
2768 | ||
f73fabfd | 2769 | return nb_event; |
2f77fc4b DG |
2770 | |
2771 | error: | |
f73fabfd DG |
2772 | /* Return negative value to differentiate return code */ |
2773 | return -ret; | |
2f77fc4b DG |
2774 | } |
2775 | ||
2776 | /* | |
2777 | * Using the session list, filled a lttng_session array to send back to the | |
2778 | * client for session listing. | |
2779 | * | |
2780 | * The session list lock MUST be acquired before calling this function. Use | |
2781 | * session_lock_list() and session_unlock_list(). | |
2782 | */ | |
2783 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
2784 | gid_t gid) | |
2785 | { | |
2786 | int ret; | |
2787 | unsigned int i = 0; | |
2788 | struct ltt_session *session; | |
2789 | struct ltt_session_list *list = session_get_list(); | |
2790 | ||
2791 | DBG("Getting all available session for UID %d GID %d", | |
2792 | uid, gid); | |
2793 | /* | |
2794 | * Iterate over session list and append data after the control struct in | |
2795 | * the buffer. | |
2796 | */ | |
2797 | cds_list_for_each_entry(session, &list->head, list) { | |
2798 | /* | |
2799 | * Only list the sessions the user can control. | |
2800 | */ | |
2801 | if (!session_access_ok(session, uid, gid)) { | |
2802 | continue; | |
2803 | } | |
2804 | ||
2805 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2806 | struct ltt_ust_session *usess = session->ust_session; | |
2807 | ||
2808 | if (session->consumer->type == CONSUMER_DST_NET || | |
2809 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
2810 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
2811 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 2812 | sizeof(sessions[i].path), session); |
2f77fc4b | 2813 | } else { |
dec56f6c | 2814 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
2815 | session->consumer->dst.trace_path); |
2816 | } | |
2817 | if (ret < 0) { | |
2818 | PERROR("snprintf session path"); | |
2819 | continue; | |
2820 | } | |
2821 | ||
2822 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
2823 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 2824 | sessions[i].enabled = session->active; |
2cbf8fed | 2825 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 2826 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
2827 | i++; |
2828 | } | |
2829 | } | |
2830 | ||
806e2684 | 2831 | /* |
6d805429 | 2832 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 2833 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 2834 | */ |
6d805429 | 2835 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
2836 | { |
2837 | int ret; | |
2838 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2839 | struct ltt_ust_session *usess = session->ust_session; | |
2840 | ||
2841 | assert(session); | |
2842 | ||
2843 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 2844 | if (session->active) { |
806e2684 DG |
2845 | ret = LTTNG_ERR_SESSION_STARTED; |
2846 | goto error; | |
3a89d11a DG |
2847 | } else { |
2848 | /* | |
2849 | * If stopped, just make sure we've started before else the above call | |
2850 | * will always send that there is data pending. | |
2851 | * | |
2852 | * The consumer assumes that when the data pending command is received, | |
2853 | * the trace has been started before or else no output data is written | |
2854 | * by the streams which is a condition for data pending. So, this is | |
2855 | * *VERY* important that we don't ask the consumer before a start | |
2856 | * trace. | |
2857 | */ | |
8382cf6f | 2858 | if (!session->has_been_started) { |
3a89d11a DG |
2859 | ret = 0; |
2860 | goto error; | |
2861 | } | |
806e2684 DG |
2862 | } |
2863 | ||
2864 | if (ksess && ksess->consumer) { | |
6d805429 DG |
2865 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
2866 | if (ret == 1) { | |
806e2684 DG |
2867 | /* Data is still being extracted for the kernel. */ |
2868 | goto error; | |
2869 | } | |
2870 | } | |
2871 | ||
2872 | if (usess && usess->consumer) { | |
6d805429 DG |
2873 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
2874 | if (ret == 1) { | |
806e2684 DG |
2875 | /* Data is still being extracted for the kernel. */ |
2876 | goto error; | |
2877 | } | |
2878 | } | |
2879 | ||
2880 | /* Data is ready to be read by a viewer */ | |
6d805429 | 2881 | ret = 0; |
806e2684 DG |
2882 | |
2883 | error: | |
2884 | return ret; | |
2885 | } | |
2886 | ||
6dc3064a DG |
2887 | /* |
2888 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
2889 | * | |
2890 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
2891 | */ | |
2892 | int cmd_snapshot_add_output(struct ltt_session *session, | |
2893 | struct lttng_snapshot_output *output, uint32_t *id) | |
2894 | { | |
2895 | int ret; | |
2896 | struct snapshot_output *new_output; | |
2897 | ||
2898 | assert(session); | |
2899 | assert(output); | |
2900 | ||
2901 | DBG("Cmd snapshot add output for session %s", session->name); | |
2902 | ||
2903 | /* | |
d3f14b8a MD |
2904 | * Permission denied to create an output if the session is not |
2905 | * set in no output mode. | |
6dc3064a DG |
2906 | */ |
2907 | if (session->output_traces) { | |
2908 | ret = LTTNG_ERR_EPERM; | |
2909 | goto error; | |
2910 | } | |
2911 | ||
2912 | /* Only one output is allowed until we have the "tee" feature. */ | |
2913 | if (session->snapshot.nb_output == 1) { | |
2914 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
2915 | goto error; | |
2916 | } | |
2917 | ||
2918 | new_output = snapshot_output_alloc(); | |
2919 | if (!new_output) { | |
2920 | ret = LTTNG_ERR_NOMEM; | |
2921 | goto error; | |
2922 | } | |
2923 | ||
2924 | ret = snapshot_output_init(output->max_size, output->name, | |
2925 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
2926 | &session->snapshot); | |
2927 | if (ret < 0) { | |
2928 | if (ret == -ENOMEM) { | |
2929 | ret = LTTNG_ERR_NOMEM; | |
2930 | } else { | |
2931 | ret = LTTNG_ERR_INVALID; | |
2932 | } | |
2933 | goto free_error; | |
2934 | } | |
2935 | ||
6dc3064a DG |
2936 | rcu_read_lock(); |
2937 | snapshot_add_output(&session->snapshot, new_output); | |
2938 | if (id) { | |
2939 | *id = new_output->id; | |
2940 | } | |
2941 | rcu_read_unlock(); | |
2942 | ||
2943 | return LTTNG_OK; | |
2944 | ||
2945 | free_error: | |
2946 | snapshot_output_destroy(new_output); | |
2947 | error: | |
2948 | return ret; | |
2949 | } | |
2950 | ||
2951 | /* | |
2952 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
2953 | * | |
2954 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
2955 | */ | |
2956 | int cmd_snapshot_del_output(struct ltt_session *session, | |
2957 | struct lttng_snapshot_output *output) | |
2958 | { | |
2959 | int ret; | |
eb240553 | 2960 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
2961 | |
2962 | assert(session); | |
2963 | assert(output); | |
2964 | ||
6dc3064a DG |
2965 | rcu_read_lock(); |
2966 | ||
2967 | /* | |
d3f14b8a MD |
2968 | * Permission denied to create an output if the session is not |
2969 | * set in no output mode. | |
6dc3064a DG |
2970 | */ |
2971 | if (session->output_traces) { | |
2972 | ret = LTTNG_ERR_EPERM; | |
2973 | goto error; | |
2974 | } | |
2975 | ||
eb240553 DG |
2976 | if (output->id) { |
2977 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
2978 | session->name); | |
2979 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
2980 | } else if (*output->name != '\0') { | |
2981 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
2982 | session->name); | |
2983 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
2984 | } | |
6dc3064a DG |
2985 | if (!sout) { |
2986 | ret = LTTNG_ERR_INVALID; | |
2987 | goto error; | |
2988 | } | |
2989 | ||
2990 | snapshot_delete_output(&session->snapshot, sout); | |
2991 | snapshot_output_destroy(sout); | |
2992 | ret = LTTNG_OK; | |
2993 | ||
2994 | error: | |
2995 | rcu_read_unlock(); | |
2996 | return ret; | |
2997 | } | |
2998 | ||
2999 | /* | |
3000 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3001 | * | |
3002 | * If no output is available, outputs is untouched and 0 is returned. | |
3003 | * | |
3004 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3005 | */ | |
3006 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3007 | struct lttng_snapshot_output **outputs) | |
3008 | { | |
3009 | int ret, idx = 0; | |
b223ca94 | 3010 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3011 | struct lttng_ht_iter iter; |
3012 | struct snapshot_output *output; | |
3013 | ||
3014 | assert(session); | |
3015 | assert(outputs); | |
3016 | ||
3017 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3018 | ||
3019 | /* | |
d3f14b8a MD |
3020 | * Permission denied to create an output if the session is not |
3021 | * set in no output mode. | |
6dc3064a DG |
3022 | */ |
3023 | if (session->output_traces) { | |
b223ca94 | 3024 | ret = -LTTNG_ERR_EPERM; |
6dc3064a DG |
3025 | goto error; |
3026 | } | |
3027 | ||
3028 | if (session->snapshot.nb_output == 0) { | |
3029 | ret = 0; | |
3030 | goto error; | |
3031 | } | |
3032 | ||
3033 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3034 | if (!list) { | |
b223ca94 | 3035 | ret = -LTTNG_ERR_NOMEM; |
6dc3064a DG |
3036 | goto error; |
3037 | } | |
3038 | ||
3039 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3040 | rcu_read_lock(); |
6dc3064a DG |
3041 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3042 | output, node.node) { | |
3043 | assert(output->consumer); | |
3044 | list[idx].id = output->id; | |
3045 | list[idx].max_size = output->max_size; | |
f02edd9e MD |
3046 | if (lttng_strncpy(list[idx].name, output->name, |
3047 | sizeof(list[idx].name))) { | |
3048 | ret = -LTTNG_ERR_INVALID; | |
3049 | goto error; | |
3050 | } | |
6dc3064a | 3051 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
f02edd9e MD |
3052 | if (lttng_strncpy(list[idx].ctrl_url, |
3053 | output->consumer->dst.trace_path, | |
3054 | sizeof(list[idx].ctrl_url))) { | |
3055 | ret = -LTTNG_ERR_INVALID; | |
3056 | goto error; | |
3057 | } | |
6dc3064a DG |
3058 | } else { |
3059 | /* Control URI. */ | |
3060 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3061 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3062 | if (ret < 0) { | |
b223ca94 JG |
3063 | ret = -LTTNG_ERR_NOMEM; |
3064 | goto error; | |
6dc3064a DG |
3065 | } |
3066 | ||
3067 | /* Data URI. */ | |
3068 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3069 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3070 | if (ret < 0) { | |
b223ca94 JG |
3071 | ret = -LTTNG_ERR_NOMEM; |
3072 | goto error; | |
6dc3064a DG |
3073 | } |
3074 | } | |
3075 | idx++; | |
3076 | } | |
3077 | ||
3078 | *outputs = list; | |
b223ca94 JG |
3079 | list = NULL; |
3080 | ret = session->snapshot.nb_output; | |
6dc3064a | 3081 | error: |
b223ca94 JG |
3082 | free(list); |
3083 | rcu_read_unlock(); | |
3084 | return ret; | |
6dc3064a DG |
3085 | } |
3086 | ||
3087 | /* | |
3088 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3089 | * snapshot output is *not* set with a remote destination. | |
3090 | * | |
a934f4af | 3091 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3092 | */ |
3093 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3094 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3095 | { | |
a934f4af | 3096 | int ret = LTTNG_OK; |
6dc3064a DG |
3097 | struct lttng_ht_iter iter; |
3098 | struct consumer_socket *socket; | |
3099 | ||
3100 | assert(consumer); | |
3101 | assert(snap_output); | |
3102 | assert(session); | |
3103 | ||
3104 | DBG2("Set relayd object from snapshot output"); | |
3105 | ||
3106 | /* Ignore if snapshot consumer output is not network. */ | |
3107 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3108 | goto error; | |
3109 | } | |
3110 | ||
3111 | /* | |
3112 | * For each consumer socket, create and send the relayd object of the | |
3113 | * snapshot output. | |
3114 | */ | |
3115 | rcu_read_lock(); | |
5eecee74 DG |
3116 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3117 | socket, node.node) { | |
6dc3064a | 3118 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3119 | snap_output->consumer, socket, |
3120 | session->name, session->hostname, | |
3121 | session->live_timer); | |
a934f4af | 3122 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3123 | rcu_read_unlock(); |
3124 | goto error; | |
3125 | } | |
3126 | } | |
3127 | rcu_read_unlock(); | |
3128 | ||
3129 | error: | |
3130 | return ret; | |
3131 | } | |
3132 | ||
3133 | /* | |
3134 | * Record a kernel snapshot. | |
3135 | * | |
fac41e72 | 3136 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3137 | */ |
3138 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3139 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3140 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3141 | { |
3142 | int ret; | |
3143 | ||
3144 | assert(ksess); | |
3145 | assert(output); | |
3146 | assert(session); | |
3147 | ||
10a50311 | 3148 | |
af706bb7 DG |
3149 | /* |
3150 | * Copy kernel session sockets so we can communicate with the right | |
3151 | * consumer for the snapshot record command. | |
3152 | */ | |
3153 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3154 | if (ret < 0) { | |
a934f4af | 3155 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3156 | goto error; |
6dc3064a DG |
3157 | } |
3158 | ||
3159 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3160 | if (ret != LTTNG_OK) { |
af706bb7 | 3161 | goto error_snapshot; |
6dc3064a DG |
3162 | } |
3163 | ||
d07ceecd | 3164 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3165 | if (ret != LTTNG_OK) { |
af706bb7 | 3166 | goto error_snapshot; |
6dc3064a DG |
3167 | } |
3168 | ||
a934f4af | 3169 | ret = LTTNG_OK; |
1371fc12 | 3170 | goto end; |
a934f4af | 3171 | |
af706bb7 DG |
3172 | error_snapshot: |
3173 | /* Clean up copied sockets so this output can use some other later on. */ | |
3174 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3175 | error: |
1371fc12 | 3176 | end: |
6dc3064a DG |
3177 | return ret; |
3178 | } | |
3179 | ||
3180 | /* | |
3181 | * Record a UST snapshot. | |
3182 | * | |
a934f4af | 3183 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3184 | */ |
3185 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3186 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3187 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3188 | { |
3189 | int ret; | |
3190 | ||
3191 | assert(usess); | |
3192 | assert(output); | |
3193 | assert(session); | |
3194 | ||
af706bb7 | 3195 | /* |
d3f14b8a | 3196 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3197 | * consumer for the snapshot record command. |
3198 | */ | |
3199 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3200 | if (ret < 0) { | |
a934f4af | 3201 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3202 | goto error; |
6dc3064a DG |
3203 | } |
3204 | ||
3205 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3206 | if (ret != LTTNG_OK) { |
af706bb7 | 3207 | goto error_snapshot; |
6dc3064a DG |
3208 | } |
3209 | ||
d07ceecd | 3210 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3211 | if (ret < 0) { |
7badf927 DG |
3212 | switch (-ret) { |
3213 | case EINVAL: | |
a934f4af | 3214 | ret = LTTNG_ERR_INVALID; |
7badf927 | 3215 | break; |
7badf927 DG |
3216 | default: |
3217 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3218 | break; | |
5c786ded | 3219 | } |
af706bb7 | 3220 | goto error_snapshot; |
6dc3064a DG |
3221 | } |
3222 | ||
a934f4af DG |
3223 | ret = LTTNG_OK; |
3224 | ||
af706bb7 DG |
3225 | error_snapshot: |
3226 | /* Clean up copied sockets so this output can use some other later on. */ | |
3227 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3228 | error: |
3229 | return ret; | |
3230 | } | |
3231 | ||
d07ceecd MD |
3232 | static |
3233 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3234 | uint64_t cur_nr_packets) | |
68808f4e | 3235 | { |
d07ceecd | 3236 | uint64_t tot_size = 0; |
68808f4e DG |
3237 | |
3238 | if (session->kernel_session) { | |
3239 | struct ltt_kernel_channel *chan; | |
3240 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3241 | ||
68808f4e | 3242 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3243 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3244 | /* | |
3245 | * Don't take channel into account if we | |
3246 | * already grab all its packets. | |
3247 | */ | |
3248 | continue; | |
68808f4e | 3249 | } |
d07ceecd MD |
3250 | tot_size += chan->channel->attr.subbuf_size |
3251 | * chan->stream_count; | |
68808f4e DG |
3252 | } |
3253 | } | |
3254 | ||
3255 | if (session->ust_session) { | |
68808f4e DG |
3256 | struct ltt_ust_session *usess = session->ust_session; |
3257 | ||
d07ceecd MD |
3258 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3259 | cur_nr_packets); | |
68808f4e DG |
3260 | } |
3261 | ||
d07ceecd | 3262 | return tot_size; |
68808f4e DG |
3263 | } |
3264 | ||
5c786ded | 3265 | /* |
d07ceecd MD |
3266 | * Calculate the number of packets we can grab from each stream that |
3267 | * fits within the overall snapshot max size. | |
3268 | * | |
3269 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3270 | * the number of packets per stream. | |
3271 | * | |
3272 | * TODO: this approach is not perfect: we consider the worse case | |
3273 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3274 | * better if we do this calculation while we actually grab the packet | |
3275 | * content: we would know how much padding we don't actually store into | |
3276 | * the file. | |
3277 | * | |
3278 | * This algorithm is currently bounded by the number of packets per | |
3279 | * stream. | |
3280 | * | |
3281 | * Since we call this algorithm before actually grabbing the data, it's | |
3282 | * an approximation: for instance, applications could appear/disappear | |
3283 | * in between this call and actually grabbing data. | |
5c786ded | 3284 | */ |
d07ceecd MD |
3285 | static |
3286 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3287 | { |
d07ceecd MD |
3288 | int64_t size_left; |
3289 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3290 | |
d07ceecd MD |
3291 | if (!max_size) { |
3292 | return 0; /* Infinite */ | |
5c786ded JD |
3293 | } |
3294 | ||
d07ceecd MD |
3295 | size_left = max_size; |
3296 | for (;;) { | |
3297 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3298 | |
d07ceecd MD |
3299 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3300 | cur_nb_packets); | |
3301 | if (!one_more_packet_tot_size) { | |
3302 | /* We are already grabbing all packets. */ | |
3303 | break; | |
3304 | } | |
3305 | size_left -= one_more_packet_tot_size; | |
3306 | if (size_left < 0) { | |
3307 | break; | |
3308 | } | |
3309 | cur_nb_packets++; | |
5c786ded | 3310 | } |
d07ceecd MD |
3311 | if (!cur_nb_packets) { |
3312 | /* Not enough room to grab one packet of each stream, error. */ | |
3313 | return -1; | |
3314 | } | |
3315 | return cur_nb_packets; | |
5c786ded JD |
3316 | } |
3317 | ||
6dc3064a DG |
3318 | /* |
3319 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3320 | * | |
3321 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3322 | * complete before returning. | |
3323 | * | |
3324 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3325 | */ | |
3326 | int cmd_snapshot_record(struct ltt_session *session, | |
3327 | struct lttng_snapshot_output *output, int wait) | |
3328 | { | |
3329 | int ret = LTTNG_OK; | |
e1986656 DG |
3330 | unsigned int use_tmp_output = 0; |
3331 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3332 | unsigned int snapshot_success = 0; |
02208dd5 | 3333 | char datetime[16]; |
6dc3064a DG |
3334 | |
3335 | assert(session); | |
ba45d9f0 | 3336 | assert(output); |
6dc3064a DG |
3337 | |
3338 | DBG("Cmd snapshot record for session %s", session->name); | |
3339 | ||
02208dd5 JR |
3340 | /* Get the datetime for the snapshot output directory. */ |
3341 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
3342 | sizeof(datetime)); | |
3343 | if (!ret) { | |
3344 | ret = LTTNG_ERR_INVALID; | |
3345 | goto error; | |
3346 | } | |
3347 | ||
6dc3064a | 3348 | /* |
d3f14b8a MD |
3349 | * Permission denied to create an output if the session is not |
3350 | * set in no output mode. | |
6dc3064a DG |
3351 | */ |
3352 | if (session->output_traces) { | |
3353 | ret = LTTNG_ERR_EPERM; | |
3354 | goto error; | |
3355 | } | |
3356 | ||
3357 | /* The session needs to be started at least once. */ | |
8382cf6f | 3358 | if (!session->has_been_started) { |
6dc3064a DG |
3359 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3360 | goto error; | |
3361 | } | |
3362 | ||
3363 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3364 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3365 | ret = snapshot_output_init(output->max_size, output->name, |
3366 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3367 | &tmp_output, NULL); |
6dc3064a DG |
3368 | if (ret < 0) { |
3369 | if (ret == -ENOMEM) { | |
3370 | ret = LTTNG_ERR_NOMEM; | |
3371 | } else { | |
3372 | ret = LTTNG_ERR_INVALID; | |
3373 | } | |
3374 | goto error; | |
3375 | } | |
1bfe7328 DG |
3376 | /* Use the global session count for the temporary snapshot. */ |
3377 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
02208dd5 JR |
3378 | |
3379 | /* Use the global datetime */ | |
3380 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); | |
e1986656 | 3381 | use_tmp_output = 1; |
6dc3064a DG |
3382 | } |
3383 | ||
b7bd3009 JR |
3384 | if (use_tmp_output) { |
3385 | int64_t nb_packets_per_stream; | |
6dc3064a | 3386 | |
b7bd3009 JR |
3387 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3388 | tmp_output.max_size); | |
3389 | if (nb_packets_per_stream < 0) { | |
3390 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3391 | goto error; | |
3392 | } | |
d07ceecd | 3393 | |
b7bd3009 JR |
3394 | if (session->kernel_session) { |
3395 | ret = record_kernel_snapshot(session->kernel_session, | |
3396 | &tmp_output, session, | |
3397 | wait, nb_packets_per_stream); | |
3398 | if (ret != LTTNG_OK) { | |
d07ceecd MD |
3399 | goto error; |
3400 | } | |
b7bd3009 JR |
3401 | } |
3402 | ||
3403 | if (session->ust_session) { | |
3404 | ret = record_ust_snapshot(session->ust_session, | |
3405 | &tmp_output, session, | |
d07ceecd | 3406 | wait, nb_packets_per_stream); |
a934f4af | 3407 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3408 | goto error; |
3409 | } | |
b7bd3009 | 3410 | } |
e1986656 | 3411 | |
b7bd3009 JR |
3412 | snapshot_success = 1; |
3413 | } else { | |
3414 | struct snapshot_output *sout; | |
3415 | struct lttng_ht_iter iter; | |
68808f4e | 3416 | |
b7bd3009 JR |
3417 | rcu_read_lock(); |
3418 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3419 | &iter.iter, sout, node.node) { | |
3420 | int64_t nb_packets_per_stream; | |
e1986656 | 3421 | |
b7bd3009 JR |
3422 | /* |
3423 | * Make a local copy of the output and assign the possible | |
3424 | * temporary value given by the caller. | |
3425 | */ | |
3426 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3427 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
1bfe7328 | 3428 | |
b7bd3009 JR |
3429 | if (output->max_size != (uint64_t) -1ULL) { |
3430 | tmp_output.max_size = output->max_size; | |
6dc3064a | 3431 | } |
d07ceecd MD |
3432 | |
3433 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3434 | tmp_output.max_size); | |
3435 | if (nb_packets_per_stream < 0) { | |
3436 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
b7bd3009 | 3437 | rcu_read_unlock(); |
d07ceecd MD |
3438 | goto error; |
3439 | } | |
6dc3064a | 3440 | |
b7bd3009 JR |
3441 | /* Use temporary name. */ |
3442 | if (*output->name != '\0') { | |
9977104c MD |
3443 | if (lttng_strncpy(tmp_output.name, output->name, |
3444 | sizeof(tmp_output.name))) { | |
3445 | ret = LTTNG_ERR_INVALID; | |
3446 | rcu_read_unlock(); | |
3447 | goto error; | |
3448 | } | |
b7bd3009 | 3449 | } |
e1986656 | 3450 | |
b7bd3009 | 3451 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
02208dd5 | 3452 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); |
e1986656 | 3453 | |
b7bd3009 JR |
3454 | if (session->kernel_session) { |
3455 | ret = record_kernel_snapshot(session->kernel_session, | |
3456 | &tmp_output, session, | |
3457 | wait, nb_packets_per_stream); | |
3458 | if (ret != LTTNG_OK) { | |
d07ceecd | 3459 | rcu_read_unlock(); |
68808f4e DG |
3460 | goto error; |
3461 | } | |
b7bd3009 | 3462 | } |
68808f4e | 3463 | |
b7bd3009 JR |
3464 | if (session->ust_session) { |
3465 | ret = record_ust_snapshot(session->ust_session, | |
3466 | &tmp_output, session, | |
d07ceecd | 3467 | wait, nb_packets_per_stream); |
a934f4af | 3468 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3469 | rcu_read_unlock(); |
3470 | goto error; | |
3471 | } | |
3472 | } | |
b7bd3009 | 3473 | snapshot_success = 1; |
6dc3064a | 3474 | } |
b7bd3009 | 3475 | rcu_read_unlock(); |
6dc3064a DG |
3476 | } |
3477 | ||
1bfe7328 DG |
3478 | if (snapshot_success) { |
3479 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
3480 | } else { |
3481 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
3482 | } |
3483 | ||
6dc3064a | 3484 | error: |
6dc3064a DG |
3485 | return ret; |
3486 | } | |
3487 | ||
d7ba1388 MD |
3488 | /* |
3489 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
3490 | */ | |
3491 | int cmd_set_session_shm_path(struct ltt_session *session, | |
3492 | const char *shm_path) | |
3493 | { | |
3494 | /* Safety net */ | |
3495 | assert(session); | |
3496 | ||
3497 | /* | |
3498 | * Can only set shm path before session is started. | |
3499 | */ | |
3500 | if (session->has_been_started) { | |
3501 | return LTTNG_ERR_SESSION_STARTED; | |
3502 | } | |
3503 | ||
3504 | strncpy(session->shm_path, shm_path, | |
3505 | sizeof(session->shm_path)); | |
3506 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
3507 | ||
3508 | return 0; | |
3509 | } | |
3510 | ||
2f77fc4b DG |
3511 | /* |
3512 | * Init command subsystem. | |
3513 | */ | |
3514 | void cmd_init(void) | |
3515 | { | |
3516 | /* | |
d88aee68 DG |
3517 | * Set network sequence index to 1 for streams to match a relayd |
3518 | * socket on the consumer side. | |
2f77fc4b | 3519 | */ |
d88aee68 DG |
3520 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
3521 | relayd_net_seq_idx = 1; | |
3522 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
3523 | |
3524 | DBG("Command subsystem initialized"); | |
3525 | } |