Commit | Line | Data |
---|---|---|
2f77fc4b DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
6c1c0768 | 19 | #define _LGPL_SOURCE |
2f77fc4b | 20 | #include <assert.h> |
1f345e94 | 21 | #include <string.h> |
6dc3064a | 22 | #include <inttypes.h> |
2f77fc4b DG |
23 | #include <urcu/list.h> |
24 | #include <urcu/uatomic.h> | |
25 | ||
26 | #include <common/defaults.h> | |
27 | #include <common/common.h> | |
28 | #include <common/sessiond-comm/sessiond-comm.h> | |
29 | #include <common/relayd/relayd.h> | |
10a50311 | 30 | #include <common/utils.h> |
2f77fc4b DG |
31 | |
32 | #include "channel.h" | |
33 | #include "consumer.h" | |
34 | #include "event.h" | |
8782cc74 | 35 | #include "health-sessiond.h" |
2f77fc4b DG |
36 | #include "kernel.h" |
37 | #include "kernel-consumer.h" | |
38 | #include "lttng-sessiond.h" | |
39 | #include "utils.h" | |
834978fd | 40 | #include "syscall.h" |
2f77fc4b DG |
41 | |
42 | #include "cmd.h" | |
43 | ||
44 | /* | |
45 | * Used to keep a unique index for each relayd socket created where this value | |
46 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
47 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
48 | * held. | |
2f77fc4b | 49 | */ |
d88aee68 DG |
50 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
51 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 52 | |
1290b5d8 JG |
53 | static int validate_event_name(const char *); |
54 | static int validate_ust_event_name(const char *); | |
55 | static int cmd_enable_event_internal(struct ltt_session *session, | |
56 | struct lttng_domain *domain, | |
57 | char *channel_name, struct lttng_event *event, | |
58 | char *filter_expression, | |
59 | struct lttng_filter_bytecode *filter, | |
60 | struct lttng_event_exclusion *exclusion, | |
61 | int wpipe); | |
62 | ||
2f77fc4b DG |
63 | /* |
64 | * Create a session path used by list_lttng_sessions for the case that the | |
65 | * session consumer is on the network. | |
66 | */ | |
67 | static int build_network_session_path(char *dst, size_t size, | |
68 | struct ltt_session *session) | |
69 | { | |
70 | int ret, kdata_port, udata_port; | |
71 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
72 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
73 | ||
74 | assert(session); | |
75 | assert(dst); | |
76 | ||
77 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
78 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
79 | ||
80 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
81 | ||
82 | if (session->kernel_session && session->kernel_session->consumer) { | |
83 | kuri = &session->kernel_session->consumer->dst.net.control; | |
84 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
85 | } | |
86 | ||
87 | if (session->ust_session && session->ust_session->consumer) { | |
88 | uuri = &session->ust_session->consumer->dst.net.control; | |
89 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
90 | } | |
91 | ||
92 | if (uuri == NULL && kuri == NULL) { | |
93 | uri = &session->consumer->dst.net.control; | |
94 | kdata_port = session->consumer->dst.net.data.port; | |
95 | } else if (kuri && uuri) { | |
96 | ret = uri_compare(kuri, uuri); | |
97 | if (ret) { | |
98 | /* Not Equal */ | |
99 | uri = kuri; | |
100 | /* Build uuri URL string */ | |
101 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
102 | if (ret < 0) { | |
103 | goto error; | |
104 | } | |
105 | } else { | |
106 | uri = kuri; | |
107 | } | |
108 | } else if (kuri && uuri == NULL) { | |
109 | uri = kuri; | |
110 | } else if (uuri && kuri == NULL) { | |
111 | uri = uuri; | |
112 | } | |
113 | ||
114 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
115 | if (ret < 0) { | |
116 | goto error; | |
117 | } | |
118 | ||
9aa9f900 DG |
119 | /* |
120 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
121 | * to print. | |
122 | */ | |
9d035200 | 123 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
124 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
125 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
126 | } else { | |
9aa9f900 | 127 | int dport; |
bef08707 | 128 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
129 | dport = kdata_port; |
130 | } else { | |
131 | /* No kernel URI, use the UST port. */ | |
132 | dport = udata_port; | |
133 | } | |
134 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
135 | } |
136 | ||
137 | error: | |
138 | return ret; | |
139 | } | |
140 | ||
141 | /* | |
142 | * Fill lttng_channel array of all channels. | |
143 | */ | |
144 | static void list_lttng_channels(int domain, struct ltt_session *session, | |
145 | struct lttng_channel *channels) | |
146 | { | |
147 | int i = 0; | |
148 | struct ltt_kernel_channel *kchan; | |
149 | ||
150 | DBG("Listing channels for session %s", session->name); | |
151 | ||
152 | switch (domain) { | |
153 | case LTTNG_DOMAIN_KERNEL: | |
154 | /* Kernel channels */ | |
155 | if (session->kernel_session != NULL) { | |
156 | cds_list_for_each_entry(kchan, | |
157 | &session->kernel_session->channel_list.head, list) { | |
158 | /* Copy lttng_channel struct to array */ | |
159 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
160 | channels[i].enabled = kchan->enabled; | |
161 | i++; | |
162 | } | |
163 | } | |
164 | break; | |
165 | case LTTNG_DOMAIN_UST: | |
166 | { | |
167 | struct lttng_ht_iter iter; | |
168 | struct ltt_ust_channel *uchan; | |
169 | ||
e7fe706f | 170 | rcu_read_lock(); |
2f77fc4b DG |
171 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
172 | &iter.iter, uchan, node.node) { | |
173 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
174 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
175 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
176 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
177 | channels[i].attr.switch_timer_interval = | |
178 | uchan->attr.switch_timer_interval; | |
179 | channels[i].attr.read_timer_interval = | |
180 | uchan->attr.read_timer_interval; | |
181 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
182 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
183 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
2f77fc4b DG |
184 | switch (uchan->attr.output) { |
185 | case LTTNG_UST_MMAP: | |
186 | default: | |
187 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
188 | break; | |
189 | } | |
190 | i++; | |
191 | } | |
e7fe706f | 192 | rcu_read_unlock(); |
2f77fc4b DG |
193 | break; |
194 | } | |
195 | default: | |
196 | break; | |
197 | } | |
198 | } | |
199 | ||
3c6a091f | 200 | /* |
022d91ba | 201 | * Create a list of agent domain events. |
3c6a091f DG |
202 | * |
203 | * Return number of events in list on success or else a negative value. | |
204 | */ | |
022d91ba | 205 | static int list_lttng_agent_events(struct agent *agt, |
3c6a091f DG |
206 | struct lttng_event **events) |
207 | { | |
208 | int i = 0, ret = 0; | |
209 | unsigned int nb_event = 0; | |
022d91ba | 210 | struct agent_event *event; |
3c6a091f DG |
211 | struct lttng_event *tmp_events; |
212 | struct lttng_ht_iter iter; | |
213 | ||
022d91ba | 214 | assert(agt); |
3c6a091f DG |
215 | assert(events); |
216 | ||
022d91ba | 217 | DBG3("Listing agent events"); |
3c6a091f | 218 | |
e5bbf678 | 219 | rcu_read_lock(); |
022d91ba | 220 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 221 | rcu_read_unlock(); |
3c6a091f DG |
222 | if (nb_event == 0) { |
223 | ret = nb_event; | |
224 | goto error; | |
225 | } | |
226 | ||
227 | tmp_events = zmalloc(nb_event * sizeof(*tmp_events)); | |
228 | if (!tmp_events) { | |
022d91ba | 229 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
230 | ret = -LTTNG_ERR_FATAL; |
231 | goto error; | |
232 | } | |
233 | ||
234 | rcu_read_lock(); | |
022d91ba | 235 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
236 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
237 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
238 | tmp_events[i].enabled = event->enabled; | |
ff94328f DG |
239 | tmp_events[i].loglevel = event->loglevel; |
240 | tmp_events[i].loglevel_type = event->loglevel_type; | |
3c6a091f DG |
241 | i++; |
242 | } | |
243 | rcu_read_unlock(); | |
244 | ||
245 | *events = tmp_events; | |
246 | ret = nb_event; | |
247 | ||
248 | error: | |
249 | assert(nb_event == i); | |
250 | return ret; | |
251 | } | |
252 | ||
2f77fc4b DG |
253 | /* |
254 | * Create a list of ust global domain events. | |
255 | */ | |
256 | static int list_lttng_ust_global_events(char *channel_name, | |
257 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
258 | { | |
259 | int i = 0, ret = 0; | |
260 | unsigned int nb_event = 0; | |
261 | struct lttng_ht_iter iter; | |
262 | struct lttng_ht_node_str *node; | |
263 | struct ltt_ust_channel *uchan; | |
264 | struct ltt_ust_event *uevent; | |
265 | struct lttng_event *tmp; | |
266 | ||
267 | DBG("Listing UST global events for channel %s", channel_name); | |
268 | ||
269 | rcu_read_lock(); | |
270 | ||
271 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
272 | node = lttng_ht_iter_get_node_str(&iter); | |
273 | if (node == NULL) { | |
f73fabfd | 274 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
275 | goto error; |
276 | } | |
277 | ||
278 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
279 | ||
8040687e | 280 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
281 | if (nb_event == 0) { |
282 | ret = nb_event; | |
283 | goto error; | |
284 | } | |
285 | ||
286 | DBG3("Listing UST global %d events", nb_event); | |
287 | ||
288 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
289 | if (tmp == NULL) { | |
f73fabfd | 290 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
291 | goto error; |
292 | } | |
293 | ||
294 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
8040687e JG |
295 | if (uevent->internal) { |
296 | /* This event should remain hidden from clients */ | |
297 | nb_event--; | |
298 | continue; | |
299 | } | |
2f77fc4b DG |
300 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
301 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
302 | tmp[i].enabled = uevent->enabled; | |
303 | ||
304 | switch (uevent->attr.instrumentation) { | |
305 | case LTTNG_UST_TRACEPOINT: | |
306 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
307 | break; | |
308 | case LTTNG_UST_PROBE: | |
309 | tmp[i].type = LTTNG_EVENT_PROBE; | |
310 | break; | |
311 | case LTTNG_UST_FUNCTION: | |
312 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
313 | break; | |
314 | } | |
315 | ||
316 | tmp[i].loglevel = uevent->attr.loglevel; | |
317 | switch (uevent->attr.loglevel_type) { | |
318 | case LTTNG_UST_LOGLEVEL_ALL: | |
319 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
320 | break; | |
321 | case LTTNG_UST_LOGLEVEL_RANGE: | |
322 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
323 | break; | |
324 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
325 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
326 | break; | |
327 | } | |
328 | if (uevent->filter) { | |
329 | tmp[i].filter = 1; | |
330 | } | |
4634f12e JI |
331 | if (uevent->exclusion) { |
332 | tmp[i].exclusion = 1; | |
333 | } | |
2f77fc4b DG |
334 | i++; |
335 | } | |
336 | ||
337 | ret = nb_event; | |
338 | *events = tmp; | |
339 | ||
340 | error: | |
341 | rcu_read_unlock(); | |
342 | return ret; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Fill lttng_event array of all kernel events in the channel. | |
347 | */ | |
348 | static int list_lttng_kernel_events(char *channel_name, | |
349 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
350 | { | |
351 | int i = 0, ret; | |
352 | unsigned int nb_event; | |
353 | struct ltt_kernel_event *event; | |
354 | struct ltt_kernel_channel *kchan; | |
355 | ||
356 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
357 | if (kchan == NULL) { | |
f73fabfd | 358 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
359 | goto error; |
360 | } | |
361 | ||
362 | nb_event = kchan->event_count; | |
363 | ||
364 | DBG("Listing events for channel %s", kchan->channel->name); | |
365 | ||
366 | if (nb_event == 0) { | |
834978fd DG |
367 | *events = NULL; |
368 | goto syscall; | |
2f77fc4b DG |
369 | } |
370 | ||
371 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
372 | if (*events == NULL) { | |
f73fabfd | 373 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
374 | goto error; |
375 | } | |
376 | ||
377 | /* Kernel channels */ | |
378 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
379 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
380 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
381 | (*events)[i].enabled = event->enabled; | |
1d515f95 JG |
382 | (*events)[i].filter = |
383 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
384 | |
385 | switch (event->event->instrumentation) { | |
386 | case LTTNG_KERNEL_TRACEPOINT: | |
387 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
388 | break; | |
2f77fc4b | 389 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
390 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
391 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
392 | sizeof(struct lttng_kernel_kprobe)); | |
393 | break; | |
394 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
395 | (*events)[i].type = LTTNG_EVENT_PROBE; |
396 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
397 | sizeof(struct lttng_kernel_kprobe)); | |
398 | break; | |
399 | case LTTNG_KERNEL_FUNCTION: | |
400 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
401 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
402 | sizeof(struct lttng_kernel_function)); | |
403 | break; | |
404 | case LTTNG_KERNEL_NOOP: | |
405 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
406 | break; | |
407 | case LTTNG_KERNEL_SYSCALL: | |
408 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
409 | break; | |
410 | case LTTNG_KERNEL_ALL: | |
411 | assert(0); | |
412 | break; | |
413 | } | |
414 | i++; | |
415 | } | |
416 | ||
834978fd DG |
417 | syscall: |
418 | if (syscall_table) { | |
419 | ssize_t new_size; | |
420 | ||
421 | new_size = syscall_list_channel(kchan, events, nb_event); | |
422 | if (new_size < 0) { | |
423 | free(events); | |
424 | ret = -new_size; | |
425 | goto error; | |
426 | } | |
427 | nb_event = new_size; | |
428 | } | |
429 | ||
2f77fc4b DG |
430 | return nb_event; |
431 | ||
432 | error: | |
f73fabfd DG |
433 | /* Negate the error code to differentiate the size from an error */ |
434 | return -ret; | |
2f77fc4b DG |
435 | } |
436 | ||
437 | /* | |
438 | * Add URI so the consumer output object. Set the correct path depending on the | |
439 | * domain adding the default trace directory. | |
440 | */ | |
441 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
442 | struct lttng_uri *uri, int domain, const char *session_name) | |
443 | { | |
f73fabfd | 444 | int ret = LTTNG_OK; |
2f77fc4b DG |
445 | const char *default_trace_dir; |
446 | ||
447 | assert(uri); | |
448 | ||
449 | if (consumer == NULL) { | |
450 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 451 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
452 | goto error; |
453 | } | |
454 | ||
455 | switch (domain) { | |
456 | case LTTNG_DOMAIN_KERNEL: | |
457 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
458 | break; | |
459 | case LTTNG_DOMAIN_UST: | |
460 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
461 | break; | |
462 | default: | |
463 | /* | |
464 | * This case is possible is we try to add the URI to the global tracing | |
465 | * session consumer object which in this case there is no subdir. | |
466 | */ | |
467 | default_trace_dir = ""; | |
468 | } | |
469 | ||
470 | switch (uri->dtype) { | |
471 | case LTTNG_DST_IPV4: | |
472 | case LTTNG_DST_IPV6: | |
473 | DBG2("Setting network URI to consumer"); | |
474 | ||
df75acac DG |
475 | if (consumer->type == CONSUMER_DST_NET) { |
476 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
477 | consumer->dst.net.control_isset) || |
478 | (uri->stype == LTTNG_STREAM_DATA && | |
479 | consumer->dst.net.data_isset)) { | |
df75acac DG |
480 | ret = LTTNG_ERR_URL_EXIST; |
481 | goto error; | |
482 | } | |
483 | } else { | |
484 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
485 | } |
486 | ||
df75acac DG |
487 | consumer->type = CONSUMER_DST_NET; |
488 | ||
2f77fc4b DG |
489 | /* Set URI into consumer output object */ |
490 | ret = consumer_set_network_uri(consumer, uri); | |
491 | if (ret < 0) { | |
a74934ba | 492 | ret = -ret; |
2f77fc4b DG |
493 | goto error; |
494 | } else if (ret == 1) { | |
495 | /* | |
496 | * URI was the same in the consumer so we do not append the subdir | |
497 | * again so to not duplicate output dir. | |
498 | */ | |
f86c9f4e | 499 | ret = LTTNG_OK; |
2f77fc4b DG |
500 | goto error; |
501 | } | |
502 | ||
503 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
504 | ret = consumer_set_subdir(consumer, session_name); | |
505 | if (ret < 0) { | |
f73fabfd | 506 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
507 | goto error; |
508 | } | |
509 | } | |
510 | ||
511 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
512 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
513 | strncat(consumer->subdir, default_trace_dir, |
514 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
515 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
516 | } | |
517 | ||
518 | break; | |
519 | case LTTNG_DST_PATH: | |
520 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
521 | memset(consumer->dst.trace_path, 0, | |
522 | sizeof(consumer->dst.trace_path)); | |
523 | strncpy(consumer->dst.trace_path, uri->dst.path, | |
524 | sizeof(consumer->dst.trace_path)); | |
525 | /* Append default trace dir */ | |
526 | strncat(consumer->dst.trace_path, default_trace_dir, | |
c30ce0b3 CB |
527 | sizeof(consumer->dst.trace_path) - |
528 | strlen(consumer->dst.trace_path) - 1); | |
2f77fc4b DG |
529 | /* Flag consumer as local. */ |
530 | consumer->type = CONSUMER_DST_LOCAL; | |
531 | break; | |
532 | } | |
533 | ||
a74934ba DG |
534 | ret = LTTNG_OK; |
535 | ||
2f77fc4b DG |
536 | error: |
537 | return ret; | |
538 | } | |
539 | ||
540 | /* | |
541 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
542 | */ | |
543 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
544 | { | |
545 | int ret = 0; | |
546 | struct lttng_ht_iter iter; | |
547 | struct consumer_socket *socket; | |
548 | ||
549 | assert(session); | |
550 | ||
e7fe706f DG |
551 | rcu_read_lock(); |
552 | ||
2f77fc4b DG |
553 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
554 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
555 | socket, node.node) { | |
2f77fc4b | 556 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 557 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
558 | pthread_mutex_unlock(socket->lock); |
559 | if (ret < 0) { | |
f73fabfd | 560 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
561 | goto error; |
562 | } | |
563 | } | |
564 | } | |
565 | ||
566 | error: | |
e7fe706f | 567 | rcu_read_unlock(); |
2f77fc4b DG |
568 | return ret; |
569 | } | |
570 | ||
571 | /* | |
572 | * Create a socket to the relayd using the URI. | |
573 | * | |
574 | * On success, the relayd_sock pointer is set to the created socket. | |
575 | * Else, it's stays untouched and a lttcomm error code is returned. | |
576 | */ | |
6151a90f JD |
577 | static int create_connect_relayd(struct lttng_uri *uri, |
578 | struct lttcomm_relayd_sock **relayd_sock) | |
2f77fc4b DG |
579 | { |
580 | int ret; | |
6151a90f | 581 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 582 | |
6151a90f JD |
583 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
584 | RELAYD_VERSION_COMM_MINOR); | |
585 | if (!rsock) { | |
f73fabfd | 586 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
587 | goto error; |
588 | } | |
589 | ||
ffe60014 DG |
590 | /* |
591 | * Connect to relayd so we can proceed with a session creation. This call | |
592 | * can possibly block for an arbitrary amount of time to set the health | |
593 | * state to be in poll execution. | |
594 | */ | |
595 | health_poll_entry(); | |
6151a90f | 596 | ret = relayd_connect(rsock); |
ffe60014 | 597 | health_poll_exit(); |
2f77fc4b DG |
598 | if (ret < 0) { |
599 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 600 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
601 | goto free_sock; |
602 | } | |
603 | ||
604 | /* Create socket for control stream. */ | |
605 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
606 | DBG3("Creating relayd stream socket from URI"); | |
607 | ||
608 | /* Check relayd version */ | |
6151a90f | 609 | ret = relayd_version_check(rsock); |
2f77fc4b | 610 | if (ret < 0) { |
f73fabfd | 611 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
612 | goto close_sock; |
613 | } | |
614 | } else if (uri->stype == LTTNG_STREAM_DATA) { | |
615 | DBG3("Creating relayd data socket from URI"); | |
616 | } else { | |
617 | /* Command is not valid */ | |
618 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 619 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
620 | goto close_sock; |
621 | } | |
622 | ||
6151a90f | 623 | *relayd_sock = rsock; |
2f77fc4b | 624 | |
f73fabfd | 625 | return LTTNG_OK; |
2f77fc4b DG |
626 | |
627 | close_sock: | |
6151a90f JD |
628 | /* The returned value is not useful since we are on an error path. */ |
629 | (void) relayd_close(rsock); | |
2f77fc4b | 630 | free_sock: |
6151a90f | 631 | free(rsock); |
2f77fc4b DG |
632 | error: |
633 | return ret; | |
634 | } | |
635 | ||
636 | /* | |
637 | * Connect to the relayd using URI and send the socket to the right consumer. | |
638 | */ | |
6dc3064a | 639 | static int send_consumer_relayd_socket(int domain, unsigned int session_id, |
2f77fc4b | 640 | struct lttng_uri *relayd_uri, struct consumer_output *consumer, |
d3e2ba59 JD |
641 | struct consumer_socket *consumer_sock, |
642 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
643 | { |
644 | int ret; | |
6151a90f | 645 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 646 | |
ffe60014 | 647 | /* Connect to relayd and make version check if uri is the control. */ |
6151a90f | 648 | ret = create_connect_relayd(relayd_uri, &rsock); |
ffe60014 | 649 | if (ret != LTTNG_OK) { |
6151a90f | 650 | goto error; |
ffe60014 | 651 | } |
6151a90f | 652 | assert(rsock); |
ffe60014 | 653 | |
2f77fc4b | 654 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
655 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
656 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
657 | /* |
658 | * Increment net_seq_idx because we are about to transfer the | |
659 | * new relayd socket to the consumer. | |
d88aee68 | 660 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 661 | */ |
d88aee68 DG |
662 | consumer->net_seq_index = ++relayd_net_seq_idx; |
663 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
664 | } |
665 | ||
2f77fc4b | 666 | /* Send relayd socket to consumer. */ |
6151a90f | 667 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
668 | relayd_uri->stype, session_id, |
669 | session_name, hostname, session_live_timer); | |
2f77fc4b | 670 | if (ret < 0) { |
f73fabfd | 671 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
672 | goto close_sock; |
673 | } | |
674 | ||
c890b720 DG |
675 | /* Flag that the corresponding socket was sent. */ |
676 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 677 | consumer_sock->control_sock_sent = 1; |
c890b720 | 678 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 679 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
680 | } |
681 | ||
f73fabfd | 682 | ret = LTTNG_OK; |
2f77fc4b DG |
683 | |
684 | /* | |
685 | * Close socket which was dup on the consumer side. The session daemon does | |
686 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
687 | */ | |
688 | ||
689 | close_sock: | |
6151a90f JD |
690 | (void) relayd_close(rsock); |
691 | free(rsock); | |
2f77fc4b | 692 | |
6151a90f | 693 | error: |
ffe60014 DG |
694 | if (ret != LTTNG_OK) { |
695 | /* | |
d9078d0c DG |
696 | * The consumer output for this session should not be used anymore |
697 | * since the relayd connection failed thus making any tracing or/and | |
698 | * streaming not usable. | |
ffe60014 | 699 | */ |
d9078d0c | 700 | consumer->enabled = 0; |
ffe60014 | 701 | } |
2f77fc4b DG |
702 | return ret; |
703 | } | |
704 | ||
705 | /* | |
706 | * Send both relayd sockets to a specific consumer and domain. This is a | |
707 | * helper function to facilitate sending the information to the consumer for a | |
708 | * session. | |
709 | */ | |
6dc3064a | 710 | static int send_consumer_relayd_sockets(int domain, unsigned int session_id, |
d3e2ba59 JD |
711 | struct consumer_output *consumer, struct consumer_socket *sock, |
712 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b | 713 | { |
dda67f6c | 714 | int ret = LTTNG_OK; |
2f77fc4b | 715 | |
2f77fc4b | 716 | assert(consumer); |
6dc3064a | 717 | assert(sock); |
2f77fc4b | 718 | |
2f77fc4b | 719 | /* Sending control relayd socket. */ |
ffe60014 | 720 | if (!sock->control_sock_sent) { |
6dc3064a | 721 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
722 | &consumer->dst.net.control, consumer, sock, |
723 | session_name, hostname, session_live_timer); | |
c890b720 DG |
724 | if (ret != LTTNG_OK) { |
725 | goto error; | |
726 | } | |
2f77fc4b DG |
727 | } |
728 | ||
729 | /* Sending data relayd socket. */ | |
ffe60014 | 730 | if (!sock->data_sock_sent) { |
6dc3064a | 731 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
732 | &consumer->dst.net.data, consumer, sock, |
733 | session_name, hostname, session_live_timer); | |
c890b720 DG |
734 | if (ret != LTTNG_OK) { |
735 | goto error; | |
736 | } | |
2f77fc4b DG |
737 | } |
738 | ||
2f77fc4b DG |
739 | error: |
740 | return ret; | |
741 | } | |
742 | ||
743 | /* | |
744 | * Setup relayd connections for a tracing session. First creates the socket to | |
745 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
746 | * network. | |
747 | */ | |
ffe60014 | 748 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 749 | { |
f73fabfd | 750 | int ret = LTTNG_OK; |
2f77fc4b DG |
751 | struct ltt_ust_session *usess; |
752 | struct ltt_kernel_session *ksess; | |
753 | struct consumer_socket *socket; | |
754 | struct lttng_ht_iter iter; | |
755 | ||
756 | assert(session); | |
757 | ||
758 | usess = session->ust_session; | |
759 | ksess = session->kernel_session; | |
760 | ||
785d2d0d | 761 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 762 | |
e7fe706f DG |
763 | rcu_read_lock(); |
764 | ||
2f77fc4b DG |
765 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
766 | && usess->consumer->enabled) { | |
767 | /* For each consumer socket, send relayd sockets */ | |
768 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
769 | socket, node.node) { | |
2f77fc4b | 770 | pthread_mutex_lock(socket->lock); |
6dc3064a | 771 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
772 | usess->consumer, socket, |
773 | session->name, session->hostname, | |
774 | session->live_timer); | |
2f77fc4b | 775 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 776 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
777 | goto error; |
778 | } | |
6dc3064a DG |
779 | /* Session is now ready for network streaming. */ |
780 | session->net_handle = 1; | |
2f77fc4b DG |
781 | } |
782 | } | |
783 | ||
784 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
785 | && ksess->consumer->enabled) { | |
786 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
787 | socket, node.node) { | |
2f77fc4b | 788 | pthread_mutex_lock(socket->lock); |
6dc3064a | 789 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
790 | ksess->consumer, socket, |
791 | session->name, session->hostname, | |
792 | session->live_timer); | |
2f77fc4b | 793 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 794 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
795 | goto error; |
796 | } | |
6dc3064a DG |
797 | /* Session is now ready for network streaming. */ |
798 | session->net_handle = 1; | |
2f77fc4b DG |
799 | } |
800 | } | |
801 | ||
802 | error: | |
e7fe706f | 803 | rcu_read_unlock(); |
2f77fc4b DG |
804 | return ret; |
805 | } | |
806 | ||
9b6c7ec5 DG |
807 | /* |
808 | * Start a kernel session by opening all necessary streams. | |
809 | */ | |
810 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
811 | { | |
812 | int ret; | |
813 | struct ltt_kernel_channel *kchan; | |
814 | ||
815 | /* Open kernel metadata */ | |
07b86b52 | 816 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
817 | ret = kernel_open_metadata(ksess); |
818 | if (ret < 0) { | |
819 | ret = LTTNG_ERR_KERN_META_FAIL; | |
820 | goto error; | |
821 | } | |
822 | } | |
823 | ||
824 | /* Open kernel metadata stream */ | |
07b86b52 | 825 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
826 | ret = kernel_open_metadata_stream(ksess); |
827 | if (ret < 0) { | |
828 | ERR("Kernel create metadata stream failed"); | |
829 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
830 | goto error; | |
831 | } | |
832 | } | |
833 | ||
834 | /* For each channel */ | |
835 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
836 | if (kchan->stream_count == 0) { | |
837 | ret = kernel_open_channel_stream(kchan); | |
838 | if (ret < 0) { | |
839 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
840 | goto error; | |
841 | } | |
842 | /* Update the stream global counter */ | |
843 | ksess->stream_count_global += ret; | |
844 | } | |
845 | } | |
846 | ||
847 | /* Setup kernel consumer socket and send fds to it */ | |
848 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 849 | if (ret != 0) { |
9b6c7ec5 DG |
850 | ret = LTTNG_ERR_KERN_START_FAIL; |
851 | goto error; | |
852 | } | |
853 | ||
854 | /* This start the kernel tracing */ | |
855 | ret = kernel_start_session(ksess); | |
856 | if (ret < 0) { | |
857 | ret = LTTNG_ERR_KERN_START_FAIL; | |
858 | goto error; | |
859 | } | |
860 | ||
861 | /* Quiescent wait after starting trace */ | |
784303b0 | 862 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 | 863 | |
14fb1ebe | 864 | ksess->active = 1; |
9b6c7ec5 DG |
865 | |
866 | ret = LTTNG_OK; | |
867 | ||
868 | error: | |
869 | return ret; | |
870 | } | |
871 | ||
2f77fc4b DG |
872 | /* |
873 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
874 | */ | |
875 | int cmd_disable_channel(struct ltt_session *session, int domain, | |
876 | char *channel_name) | |
877 | { | |
878 | int ret; | |
879 | struct ltt_ust_session *usess; | |
880 | ||
881 | usess = session->ust_session; | |
882 | ||
2223c96f DG |
883 | rcu_read_lock(); |
884 | ||
2f77fc4b DG |
885 | switch (domain) { |
886 | case LTTNG_DOMAIN_KERNEL: | |
887 | { | |
888 | ret = channel_kernel_disable(session->kernel_session, | |
889 | channel_name); | |
f73fabfd | 890 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
891 | goto error; |
892 | } | |
893 | ||
894 | kernel_wait_quiescent(kernel_tracer_fd); | |
895 | break; | |
896 | } | |
897 | case LTTNG_DOMAIN_UST: | |
898 | { | |
899 | struct ltt_ust_channel *uchan; | |
900 | struct lttng_ht *chan_ht; | |
901 | ||
902 | chan_ht = usess->domain_global.channels; | |
903 | ||
904 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
905 | if (uchan == NULL) { | |
f73fabfd | 906 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
907 | goto error; |
908 | } | |
909 | ||
7972aab2 | 910 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 911 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
912 | goto error; |
913 | } | |
914 | break; | |
915 | } | |
2f77fc4b | 916 | default: |
f73fabfd | 917 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
918 | goto error; |
919 | } | |
920 | ||
f73fabfd | 921 | ret = LTTNG_OK; |
2f77fc4b DG |
922 | |
923 | error: | |
2223c96f | 924 | rcu_read_unlock(); |
2f77fc4b DG |
925 | return ret; |
926 | } | |
927 | ||
ccf10263 MD |
928 | /* |
929 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
930 | * |
931 | * Called with session lock held. | |
ccf10263 MD |
932 | */ |
933 | int cmd_track_pid(struct ltt_session *session, int domain, int pid) | |
934 | { | |
935 | int ret; | |
936 | ||
937 | rcu_read_lock(); | |
938 | ||
939 | switch (domain) { | |
940 | case LTTNG_DOMAIN_KERNEL: | |
941 | { | |
942 | struct ltt_kernel_session *ksess; | |
943 | ||
944 | ksess = session->kernel_session; | |
945 | ||
946 | ret = kernel_track_pid(ksess, pid); | |
947 | if (ret != LTTNG_OK) { | |
948 | goto error; | |
949 | } | |
950 | ||
951 | kernel_wait_quiescent(kernel_tracer_fd); | |
952 | break; | |
953 | } | |
ccf10263 | 954 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
955 | { |
956 | struct ltt_ust_session *usess; | |
957 | ||
958 | usess = session->ust_session; | |
959 | ||
960 | ret = trace_ust_track_pid(usess, pid); | |
961 | if (ret != LTTNG_OK) { | |
962 | goto error; | |
963 | } | |
964 | break; | |
965 | } | |
ccf10263 MD |
966 | default: |
967 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
968 | goto error; | |
969 | } | |
970 | ||
971 | ret = LTTNG_OK; | |
972 | ||
973 | error: | |
974 | rcu_read_unlock(); | |
975 | return ret; | |
976 | } | |
977 | ||
978 | /* | |
979 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
980 | * |
981 | * Called with session lock held. | |
ccf10263 MD |
982 | */ |
983 | int cmd_untrack_pid(struct ltt_session *session, int domain, int pid) | |
984 | { | |
985 | int ret; | |
986 | ||
987 | rcu_read_lock(); | |
988 | ||
989 | switch (domain) { | |
990 | case LTTNG_DOMAIN_KERNEL: | |
991 | { | |
992 | struct ltt_kernel_session *ksess; | |
993 | ||
994 | ksess = session->kernel_session; | |
995 | ||
996 | ret = kernel_untrack_pid(ksess, pid); | |
997 | if (ret != LTTNG_OK) { | |
998 | goto error; | |
999 | } | |
1000 | ||
1001 | kernel_wait_quiescent(kernel_tracer_fd); | |
1002 | break; | |
1003 | } | |
ccf10263 | 1004 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1005 | { |
1006 | struct ltt_ust_session *usess; | |
1007 | ||
1008 | usess = session->ust_session; | |
1009 | ||
1010 | ret = trace_ust_untrack_pid(usess, pid); | |
1011 | if (ret != LTTNG_OK) { | |
1012 | goto error; | |
1013 | } | |
1014 | break; | |
1015 | } | |
ccf10263 MD |
1016 | default: |
1017 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1018 | goto error; | |
1019 | } | |
1020 | ||
1021 | ret = LTTNG_OK; | |
1022 | ||
1023 | error: | |
1024 | rcu_read_unlock(); | |
1025 | return ret; | |
1026 | } | |
1027 | ||
2f77fc4b DG |
1028 | /* |
1029 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1030 | * | |
1031 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1032 | */ | |
1033 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1034 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1035 | { |
1036 | int ret; | |
1037 | struct ltt_ust_session *usess = session->ust_session; | |
1038 | struct lttng_ht *chan_ht; | |
1f345e94 | 1039 | size_t len; |
2f77fc4b DG |
1040 | |
1041 | assert(session); | |
1042 | assert(attr); | |
7972aab2 | 1043 | assert(domain); |
2f77fc4b | 1044 | |
1f345e94 PP |
1045 | len = strnlen(attr->name, sizeof(attr->name)); |
1046 | ||
1047 | /* Validate channel name */ | |
1048 | if (attr->name[0] == '.' || | |
1049 | memchr(attr->name, '/', len) != NULL) { | |
1050 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1051 | goto end; | |
1052 | } | |
1053 | ||
2f77fc4b DG |
1054 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1055 | ||
03b4fdcf DG |
1056 | rcu_read_lock(); |
1057 | ||
ecc48a90 JD |
1058 | /* |
1059 | * Don't try to enable a channel if the session has been started at | |
1060 | * some point in time before. The tracer does not allow it. | |
1061 | */ | |
8382cf6f | 1062 | if (session->has_been_started) { |
ecc48a90 JD |
1063 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1064 | goto error; | |
1065 | } | |
1066 | ||
1067 | /* | |
1068 | * If the session is a live session, remove the switch timer, the | |
1069 | * live timer does the same thing but sends also synchronisation | |
1070 | * beacons for inactive streams. | |
1071 | */ | |
1072 | if (session->live_timer > 0) { | |
1073 | attr->attr.live_timer_interval = session->live_timer; | |
1074 | attr->attr.switch_timer_interval = 0; | |
1075 | } | |
1076 | ||
33fbd469 DG |
1077 | /* |
1078 | * The ringbuffer (both in user space and kernel) behave badly in overwrite | |
1079 | * mode and with less than 2 subbuf so block it right away and send back an | |
1080 | * invalid attribute error. | |
1081 | */ | |
1082 | if (attr->attr.overwrite && attr->attr.num_subbuf < 2) { | |
1083 | ret = LTTNG_ERR_INVALID; | |
1084 | goto error; | |
1085 | } | |
1086 | ||
7972aab2 | 1087 | switch (domain->type) { |
2f77fc4b DG |
1088 | case LTTNG_DOMAIN_KERNEL: |
1089 | { | |
1090 | struct ltt_kernel_channel *kchan; | |
1091 | ||
2f77fc4b DG |
1092 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1093 | session->kernel_session); | |
1094 | if (kchan == NULL) { | |
1095 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1096 | if (attr->name[0] != '\0') { |
1097 | session->kernel_session->has_non_default_channel = 1; | |
1098 | } | |
2f77fc4b DG |
1099 | } else { |
1100 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1101 | } | |
1102 | ||
f73fabfd | 1103 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1104 | goto error; |
1105 | } | |
1106 | ||
784303b0 | 1107 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1108 | break; |
1109 | } | |
1110 | case LTTNG_DOMAIN_UST: | |
ab24e525 JG |
1111 | case LTTNG_DOMAIN_JUL: |
1112 | case LTTNG_DOMAIN_LOG4J: | |
1113 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1114 | { |
1115 | struct ltt_ust_channel *uchan; | |
1116 | ||
ab24e525 JG |
1117 | /* |
1118 | * FIXME | |
1119 | * | |
1120 | * Current agent implementation limitations force us to allow | |
1121 | * only one channel at once in "agent" subdomains. Each | |
1122 | * subdomain has a default channel name which must be strictly | |
1123 | * adhered to. | |
1124 | */ | |
1125 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1126 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1127 | LTTNG_SYMBOL_NAME_LEN)) { | |
1128 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1129 | goto error; | |
1130 | } | |
1131 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1132 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1133 | LTTNG_SYMBOL_NAME_LEN)) { | |
1134 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1135 | goto error; | |
1136 | } | |
1137 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1138 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1139 | LTTNG_SYMBOL_NAME_LEN)) { | |
1140 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1141 | goto error; | |
1142 | } | |
1143 | } | |
1144 | ||
2f77fc4b DG |
1145 | chan_ht = usess->domain_global.channels; |
1146 | ||
1147 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1148 | if (uchan == NULL) { | |
7972aab2 | 1149 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1150 | if (attr->name[0] != '\0') { |
1151 | usess->has_non_default_channel = 1; | |
1152 | } | |
2f77fc4b | 1153 | } else { |
7972aab2 | 1154 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1155 | } |
1156 | break; | |
1157 | } | |
2f77fc4b | 1158 | default: |
f73fabfd | 1159 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1160 | goto error; |
1161 | } | |
1162 | ||
1163 | error: | |
2223c96f | 1164 | rcu_read_unlock(); |
1f345e94 | 1165 | end: |
2f77fc4b DG |
1166 | return ret; |
1167 | } | |
1168 | ||
2f77fc4b DG |
1169 | /* |
1170 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1171 | */ | |
1172 | int cmd_disable_event(struct ltt_session *session, int domain, | |
6e911cad MD |
1173 | char *channel_name, |
1174 | struct lttng_event *event) | |
2f77fc4b DG |
1175 | { |
1176 | int ret; | |
6e911cad MD |
1177 | char *event_name; |
1178 | ||
18a720cd MD |
1179 | DBG("Disable event command for event \'%s\'", event->name); |
1180 | ||
6e911cad | 1181 | event_name = event->name; |
1290b5d8 JG |
1182 | if (validate_event_name(event_name)) { |
1183 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1184 | goto error; | |
1185 | } | |
6e911cad | 1186 | |
9b7431cf JG |
1187 | /* Error out on unhandled search criteria */ |
1188 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1189 | || event->pid || event->filter || event->exclusion) { |
1290b5d8 JG |
1190 | ret = LTTNG_ERR_UNK; |
1191 | goto error; | |
6e911cad | 1192 | } |
2f77fc4b | 1193 | |
2223c96f DG |
1194 | rcu_read_lock(); |
1195 | ||
2f77fc4b DG |
1196 | switch (domain) { |
1197 | case LTTNG_DOMAIN_KERNEL: | |
1198 | { | |
1199 | struct ltt_kernel_channel *kchan; | |
1200 | struct ltt_kernel_session *ksess; | |
1201 | ||
1202 | ksess = session->kernel_session; | |
1203 | ||
85076754 MD |
1204 | /* |
1205 | * If a non-default channel has been created in the | |
1206 | * session, explicitely require that -c chan_name needs | |
1207 | * to be provided. | |
1208 | */ | |
1209 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1210 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1290b5d8 | 1211 | goto error_unlock; |
85076754 MD |
1212 | } |
1213 | ||
2f77fc4b DG |
1214 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1215 | if (kchan == NULL) { | |
f73fabfd | 1216 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
1290b5d8 | 1217 | goto error_unlock; |
2f77fc4b DG |
1218 | } |
1219 | ||
6e911cad MD |
1220 | switch (event->type) { |
1221 | case LTTNG_EVENT_ALL: | |
d0ae4ea8 | 1222 | ret = event_kernel_disable_event_all(kchan); |
29c62722 | 1223 | if (ret != LTTNG_OK) { |
1290b5d8 | 1224 | goto error_unlock; |
29c62722 MD |
1225 | } |
1226 | break; | |
d0ae4ea8 MD |
1227 | case LTTNG_EVENT_TRACEPOINT: /* fall-through */ |
1228 | case LTTNG_EVENT_SYSCALL: | |
29c62722 | 1229 | if (!strcmp(event_name, "*")) { |
d0ae4ea8 MD |
1230 | ret = event_kernel_disable_event_type(kchan, |
1231 | event->type); | |
29c62722 | 1232 | } else { |
d0ae4ea8 MD |
1233 | ret = event_kernel_disable_event(kchan, |
1234 | event_name); | |
29c62722 | 1235 | } |
6e911cad | 1236 | if (ret != LTTNG_OK) { |
1290b5d8 | 1237 | goto error_unlock; |
6e911cad MD |
1238 | } |
1239 | break; | |
d0ae4ea8 MD |
1240 | case LTTNG_EVENT_PROBE: |
1241 | case LTTNG_EVENT_FUNCTION: | |
1242 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
1243 | ret = event_kernel_disable_event(kchan, event_name); | |
e2b957af | 1244 | if (ret != LTTNG_OK) { |
1290b5d8 | 1245 | goto error_unlock; |
e2b957af | 1246 | } |
6e911cad MD |
1247 | break; |
1248 | default: | |
1249 | ret = LTTNG_ERR_UNK; | |
1290b5d8 | 1250 | goto error_unlock; |
2f77fc4b DG |
1251 | } |
1252 | ||
1253 | kernel_wait_quiescent(kernel_tracer_fd); | |
1254 | break; | |
1255 | } | |
1256 | case LTTNG_DOMAIN_UST: | |
1257 | { | |
1258 | struct ltt_ust_channel *uchan; | |
1259 | struct ltt_ust_session *usess; | |
1260 | ||
1261 | usess = session->ust_session; | |
1262 | ||
1290b5d8 JG |
1263 | if (validate_ust_event_name(event_name)) { |
1264 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1265 | goto error_unlock; | |
1266 | } | |
1267 | ||
85076754 MD |
1268 | /* |
1269 | * If a non-default channel has been created in the | |
1270 | * session, explicitely require that -c chan_name needs | |
1271 | * to be provided. | |
1272 | */ | |
1273 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1274 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1290b5d8 | 1275 | goto error_unlock; |
85076754 MD |
1276 | } |
1277 | ||
2f77fc4b DG |
1278 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1279 | channel_name); | |
1280 | if (uchan == NULL) { | |
f73fabfd | 1281 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
1290b5d8 | 1282 | goto error_unlock; |
2f77fc4b DG |
1283 | } |
1284 | ||
6e911cad MD |
1285 | switch (event->type) { |
1286 | case LTTNG_EVENT_ALL: | |
1287 | ret = event_ust_disable_tracepoint(usess, uchan, event_name); | |
1288 | if (ret != LTTNG_OK) { | |
1290b5d8 | 1289 | goto error_unlock; |
6e911cad MD |
1290 | } |
1291 | break; | |
1292 | default: | |
1293 | ret = LTTNG_ERR_UNK; | |
1290b5d8 | 1294 | goto error_unlock; |
2f77fc4b DG |
1295 | } |
1296 | ||
1297 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1298 | channel_name); | |
1299 | break; | |
1300 | } | |
5cdb6027 | 1301 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1302 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1303 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1304 | { |
fefd409b | 1305 | struct agent *agt; |
f20baf8e DG |
1306 | struct ltt_ust_session *usess = session->ust_session; |
1307 | ||
1308 | assert(usess); | |
1309 | ||
6e911cad MD |
1310 | switch (event->type) { |
1311 | case LTTNG_EVENT_ALL: | |
1312 | break; | |
1313 | default: | |
1314 | ret = LTTNG_ERR_UNK; | |
1290b5d8 | 1315 | goto error_unlock; |
6e911cad MD |
1316 | } |
1317 | ||
5cdb6027 | 1318 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1319 | if (!agt) { |
1320 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
1290b5d8 | 1321 | goto error_unlock; |
fefd409b | 1322 | } |
18a720cd MD |
1323 | /* The wild card * means that everything should be disabled. */ |
1324 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
1325 | ret = event_agent_disable_all(usess, agt); | |
1326 | } else { | |
1327 | ret = event_agent_disable(usess, agt, event_name); | |
1328 | } | |
f20baf8e | 1329 | if (ret != LTTNG_OK) { |
1290b5d8 | 1330 | goto error_unlock; |
f20baf8e DG |
1331 | } |
1332 | ||
1333 | break; | |
1334 | } | |
2f77fc4b | 1335 | default: |
f73fabfd | 1336 | ret = LTTNG_ERR_UND; |
1290b5d8 | 1337 | goto error_unlock; |
2f77fc4b DG |
1338 | } |
1339 | ||
f73fabfd | 1340 | ret = LTTNG_OK; |
2f77fc4b | 1341 | |
1290b5d8 | 1342 | error_unlock: |
2223c96f | 1343 | rcu_read_unlock(); |
1290b5d8 | 1344 | error: |
2f77fc4b DG |
1345 | return ret; |
1346 | } | |
1347 | ||
2f77fc4b DG |
1348 | /* |
1349 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1350 | */ | |
1351 | int cmd_add_context(struct ltt_session *session, int domain, | |
601d5acf | 1352 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1353 | { |
d5979e4a | 1354 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
2f77fc4b DG |
1355 | |
1356 | switch (domain) { | |
1357 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1358 | assert(session->kernel_session); |
1359 | ||
1360 | if (session->kernel_session->channel_count == 0) { | |
1361 | /* Create default channel */ | |
1362 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1363 | if (ret != LTTNG_OK) { | |
1364 | goto error; | |
1365 | } | |
d5979e4a | 1366 | chan_kern_created = 1; |
979e618e | 1367 | } |
2f77fc4b | 1368 | /* Add kernel context to kernel tracer */ |
601d5acf | 1369 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1370 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1371 | goto error; |
1372 | } | |
1373 | break; | |
1374 | case LTTNG_DOMAIN_UST: | |
1375 | { | |
1376 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1377 | unsigned int chan_count; |
1378 | ||
2f77fc4b DG |
1379 | assert(usess); |
1380 | ||
85076754 | 1381 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1382 | if (chan_count == 0) { |
1383 | struct lttng_channel *attr; | |
1384 | /* Create default channel */ | |
0a9c6494 | 1385 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1386 | if (attr == NULL) { |
1387 | ret = LTTNG_ERR_FATAL; | |
1388 | goto error; | |
1389 | } | |
1390 | ||
7972aab2 | 1391 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1392 | if (ret != LTTNG_OK) { |
1393 | free(attr); | |
1394 | goto error; | |
1395 | } | |
1396 | free(attr); | |
d5979e4a | 1397 | chan_ust_created = 1; |
979e618e DG |
1398 | } |
1399 | ||
601d5acf | 1400 | ret = context_ust_add(usess, domain, ctx, channel_name); |
f73fabfd | 1401 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1402 | goto error; |
1403 | } | |
1404 | break; | |
1405 | } | |
2f77fc4b | 1406 | default: |
f73fabfd | 1407 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1408 | goto error; |
1409 | } | |
1410 | ||
d5979e4a | 1411 | return LTTNG_OK; |
2f77fc4b DG |
1412 | |
1413 | error: | |
d5979e4a DG |
1414 | if (chan_kern_created) { |
1415 | struct ltt_kernel_channel *kchan = | |
1416 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1417 | session->kernel_session); | |
1418 | /* Created previously, this should NOT fail. */ | |
1419 | assert(kchan); | |
1420 | kernel_destroy_channel(kchan); | |
1421 | } | |
1422 | ||
1423 | if (chan_ust_created) { | |
1424 | struct ltt_ust_channel *uchan = | |
1425 | trace_ust_find_channel_by_name( | |
1426 | session->ust_session->domain_global.channels, | |
1427 | DEFAULT_CHANNEL_NAME); | |
1428 | /* Created previously, this should NOT fail. */ | |
1429 | assert(uchan); | |
1430 | /* Remove from the channel list of the session. */ | |
1431 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1432 | uchan); | |
1433 | trace_ust_destroy_channel(uchan); | |
1434 | } | |
2f77fc4b DG |
1435 | return ret; |
1436 | } | |
1437 | ||
930a2e99 JG |
1438 | static int validate_event_name(const char *name) |
1439 | { | |
1440 | int ret = 0; | |
1441 | const char *c = name; | |
1442 | const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN; | |
1443 | ||
1444 | /* | |
1445 | * Make sure that unescaped wildcards are only used as the last | |
1446 | * character of the event name. | |
1447 | */ | |
1448 | while (c < event_name_end) { | |
1449 | switch (*c) { | |
1450 | case '\0': | |
1451 | goto end; | |
1452 | case '\\': | |
1453 | c++; | |
1454 | break; | |
1455 | case '*': | |
1456 | if ((c + 1) < event_name_end && *(c + 1)) { | |
1457 | /* Wildcard is not the last character */ | |
1458 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1459 | goto end; | |
1460 | } | |
1461 | default: | |
1462 | break; | |
1463 | } | |
1464 | c++; | |
1465 | } | |
1466 | end: | |
1467 | return ret; | |
1468 | } | |
1469 | ||
c8100299 JG |
1470 | static inline bool name_starts_with(const char *name, const char *prefix) |
1471 | { | |
1472 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1473 | ||
1474 | return !strncmp(name, prefix, max_cmp_len); | |
1475 | } | |
1476 | ||
1477 | /* Perform userspace-specific event name validation */ | |
1478 | static int validate_ust_event_name(const char *name) | |
1479 | { | |
1480 | int ret = 0; | |
1481 | ||
1482 | if (!name) { | |
1483 | ret = -1; | |
1484 | goto end; | |
1485 | } | |
1486 | ||
1487 | /* | |
1488 | * Check name against all internal UST event component namespaces used | |
1489 | * by the agents. | |
1490 | */ | |
1491 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1492 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1493 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1494 | ret = -1; | |
1495 | } | |
1496 | ||
1497 | end: | |
1498 | return ret; | |
1499 | } | |
9732459c | 1500 | |
2f77fc4b | 1501 | /* |
9732459c JG |
1502 | * Internal version of cmd_enable_event() with a supplemental |
1503 | * "internal_event" flag which is used to enable internal events which should | |
1504 | * be hidden from clients. Such events are used in the agent implementation to | |
1505 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1506 | */ |
9732459c JG |
1507 | static int _cmd_enable_event(struct ltt_session *session, |
1508 | struct lttng_domain *domain, | |
025faf73 | 1509 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1510 | char *filter_expression, |
db8f1377 JI |
1511 | struct lttng_filter_bytecode *filter, |
1512 | struct lttng_event_exclusion *exclusion, | |
9732459c | 1513 | int wpipe, bool internal_event) |
2f77fc4b | 1514 | { |
e5f5db7f | 1515 | int ret, channel_created = 0; |
2f77fc4b DG |
1516 | struct lttng_channel *attr; |
1517 | ||
1518 | assert(session); | |
1519 | assert(event); | |
1520 | assert(channel_name); | |
1521 | ||
18a720cd MD |
1522 | DBG("Enable event command for event \'%s\'", event->name); |
1523 | ||
930a2e99 JG |
1524 | ret = validate_event_name(event->name); |
1525 | if (ret) { | |
1526 | goto error; | |
1527 | } | |
1528 | ||
2223c96f DG |
1529 | rcu_read_lock(); |
1530 | ||
7972aab2 | 1531 | switch (domain->type) { |
2f77fc4b DG |
1532 | case LTTNG_DOMAIN_KERNEL: |
1533 | { | |
1534 | struct ltt_kernel_channel *kchan; | |
1535 | ||
85076754 MD |
1536 | /* |
1537 | * If a non-default channel has been created in the | |
1538 | * session, explicitely require that -c chan_name needs | |
1539 | * to be provided. | |
1540 | */ | |
1541 | if (session->kernel_session->has_non_default_channel | |
1542 | && channel_name[0] == '\0') { | |
1543 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1544 | goto error; | |
1545 | } | |
1546 | ||
2f77fc4b DG |
1547 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1548 | session->kernel_session); | |
1549 | if (kchan == NULL) { | |
0a9c6494 DG |
1550 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1551 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1552 | if (attr == NULL) { |
f73fabfd | 1553 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1554 | goto error; |
1555 | } | |
1556 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1557 | ||
1558 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1559 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1560 | free(attr); |
1561 | goto error; | |
1562 | } | |
1563 | free(attr); | |
e5f5db7f DG |
1564 | |
1565 | channel_created = 1; | |
2f77fc4b DG |
1566 | } |
1567 | ||
1568 | /* Get the newly created kernel channel pointer */ | |
1569 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1570 | session->kernel_session); | |
1571 | if (kchan == NULL) { | |
1572 | /* This sould not happen... */ | |
f73fabfd | 1573 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1574 | goto error; |
1575 | } | |
1576 | ||
6e911cad MD |
1577 | switch (event->type) { |
1578 | case LTTNG_EVENT_ALL: | |
29c62722 | 1579 | { |
00a62084 MD |
1580 | char *filter_expression_a = NULL; |
1581 | struct lttng_filter_bytecode *filter_a = NULL; | |
1582 | ||
1583 | /* | |
1584 | * We need to duplicate filter_expression and filter, | |
1585 | * because ownership is passed to first enable | |
1586 | * event. | |
1587 | */ | |
1588 | if (filter_expression) { | |
1589 | filter_expression_a = strdup(filter_expression); | |
1590 | if (!filter_expression_a) { | |
1591 | ret = LTTNG_ERR_FATAL; | |
1592 | goto error; | |
1593 | } | |
1594 | } | |
1595 | if (filter) { | |
1596 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1597 | if (!filter_a) { | |
1598 | free(filter_expression_a); | |
1599 | ret = LTTNG_ERR_FATAL; | |
1600 | goto error; | |
1601 | } | |
1602 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1603 | } | |
29c62722 | 1604 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1605 | ret = event_kernel_enable_event(kchan, event, |
1606 | filter_expression, filter); | |
a969e101 MD |
1607 | /* We have passed ownership */ |
1608 | filter_expression = NULL; | |
1609 | filter = NULL; | |
29c62722 MD |
1610 | if (ret != LTTNG_OK) { |
1611 | if (channel_created) { | |
1612 | /* Let's not leak a useless channel. */ | |
1613 | kernel_destroy_channel(kchan); | |
1614 | } | |
00a62084 MD |
1615 | free(filter_expression_a); |
1616 | free(filter_a); | |
29c62722 MD |
1617 | goto error; |
1618 | } | |
1619 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1620 | ret = event_kernel_enable_event(kchan, event, |
1621 | filter_expression_a, filter_a); | |
29c62722 | 1622 | if (ret != LTTNG_OK) { |
00a62084 MD |
1623 | free(filter_expression_a); |
1624 | free(filter_a); | |
29c62722 MD |
1625 | goto error; |
1626 | } | |
1627 | break; | |
1628 | } | |
6e6ef3d7 DG |
1629 | case LTTNG_EVENT_PROBE: |
1630 | case LTTNG_EVENT_FUNCTION: | |
1631 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1632 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
1633 | ret = event_kernel_enable_event(kchan, event, |
1634 | filter_expression, filter); | |
a969e101 MD |
1635 | /* We have passed ownership */ |
1636 | filter_expression = NULL; | |
1637 | filter = NULL; | |
6e911cad MD |
1638 | if (ret != LTTNG_OK) { |
1639 | if (channel_created) { | |
1640 | /* Let's not leak a useless channel. */ | |
1641 | kernel_destroy_channel(kchan); | |
1642 | } | |
1643 | goto error; | |
e5f5db7f | 1644 | } |
6e911cad MD |
1645 | break; |
1646 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1647 | ret = event_kernel_enable_event(kchan, event, |
1648 | filter_expression, filter); | |
a969e101 MD |
1649 | /* We have passed ownership */ |
1650 | filter_expression = NULL; | |
1651 | filter = NULL; | |
e2b957af MD |
1652 | if (ret != LTTNG_OK) { |
1653 | goto error; | |
1654 | } | |
6e911cad MD |
1655 | break; |
1656 | default: | |
1657 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1658 | goto error; |
1659 | } | |
1660 | ||
1661 | kernel_wait_quiescent(kernel_tracer_fd); | |
1662 | break; | |
1663 | } | |
1664 | case LTTNG_DOMAIN_UST: | |
1665 | { | |
1666 | struct ltt_ust_channel *uchan; | |
1667 | struct ltt_ust_session *usess = session->ust_session; | |
1668 | ||
1669 | assert(usess); | |
1670 | ||
85076754 MD |
1671 | /* |
1672 | * If a non-default channel has been created in the | |
1673 | * session, explicitely require that -c chan_name needs | |
1674 | * to be provided. | |
1675 | */ | |
1676 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1677 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1678 | goto error; | |
1679 | } | |
1680 | ||
2f77fc4b DG |
1681 | /* Get channel from global UST domain */ |
1682 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1683 | channel_name); | |
1684 | if (uchan == NULL) { | |
1685 | /* Create default channel */ | |
0a9c6494 DG |
1686 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
1687 | usess->buffer_type); | |
2f77fc4b | 1688 | if (attr == NULL) { |
f73fabfd | 1689 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1690 | goto error; |
1691 | } | |
1692 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1693 | ||
1694 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1695 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1696 | free(attr); |
1697 | goto error; | |
1698 | } | |
1699 | free(attr); | |
1700 | ||
1701 | /* Get the newly created channel reference back */ | |
1702 | uchan = trace_ust_find_channel_by_name( | |
1703 | usess->domain_global.channels, channel_name); | |
1704 | assert(uchan); | |
1705 | } | |
1706 | ||
9ab6d7ea JG |
1707 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
1708 | /* | |
1709 | * Don't allow users to add UST events to channels which | |
1710 | * are assigned to a userspace subdomain (JUL, Log4J, | |
1711 | * Python, etc.). | |
1712 | */ | |
1713 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
1714 | goto error; | |
1715 | } | |
1716 | ||
c8100299 JG |
1717 | if (!internal_event) { |
1718 | /* | |
1719 | * Ensure the event name is not reserved for internal | |
1720 | * use. | |
1721 | */ | |
1722 | ret = validate_ust_event_name(event->name); | |
1723 | if (ret) { | |
1724 | WARN("Userspace event name %s failed validation.", | |
1725 | event->name ? | |
1726 | event->name : "NULL"); | |
1727 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1728 | goto error; | |
1729 | } | |
1730 | } | |
1731 | ||
2f77fc4b | 1732 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 1733 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
9732459c JG |
1734 | filter_expression, filter, exclusion, |
1735 | internal_event); | |
49d21f93 MD |
1736 | /* We have passed ownership */ |
1737 | filter_expression = NULL; | |
1738 | filter = NULL; | |
1739 | exclusion = NULL; | |
f73fabfd | 1740 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1741 | goto error; |
1742 | } | |
1743 | break; | |
1744 | } | |
5cdb6027 | 1745 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1746 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1747 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1748 | { |
da6c3a50 | 1749 | const char *default_event_name, *default_chan_name; |
fefd409b | 1750 | struct agent *agt; |
f20baf8e DG |
1751 | struct lttng_event uevent; |
1752 | struct lttng_domain tmp_dom; | |
1753 | struct ltt_ust_session *usess = session->ust_session; | |
1754 | ||
1755 | assert(usess); | |
1756 | ||
5cdb6027 | 1757 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 1758 | if (!agt) { |
5cdb6027 | 1759 | agt = agent_create(domain->type); |
fefd409b | 1760 | if (!agt) { |
948f8adb | 1761 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
1762 | goto error; |
1763 | } | |
1764 | agent_add(agt, usess->agents); | |
1765 | } | |
1766 | ||
022d91ba | 1767 | /* Create the default tracepoint. */ |
996de3c7 | 1768 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
1769 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
1770 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
0a3fca4d JG |
1771 | default_event_name = event_get_default_agent_ust_name( |
1772 | domain->type); | |
da6c3a50 | 1773 | if (!default_event_name) { |
948f8adb | 1774 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 1775 | goto error; |
f43f95a9 | 1776 | } |
da6c3a50 | 1777 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
1778 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
1779 | ||
1780 | /* | |
1781 | * The domain type is changed because we are about to enable the | |
1782 | * default channel and event for the JUL domain that are hardcoded. | |
1783 | * This happens in the UST domain. | |
1784 | */ | |
1785 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
1786 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
1787 | ||
0e115563 DG |
1788 | switch (domain->type) { |
1789 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 1790 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
1791 | break; |
1792 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 1793 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
1794 | break; |
1795 | case LTTNG_DOMAIN_PYTHON: | |
1796 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
1797 | break; | |
1798 | default: | |
1799 | /* The switch/case we are in should avoid this else big problem */ | |
1800 | assert(0); | |
da6c3a50 DG |
1801 | } |
1802 | ||
971da06a | 1803 | { |
d75bffee | 1804 | char *filter_expression_copy = NULL; |
0a3fca4d | 1805 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
1806 | |
1807 | if (filter) { | |
0a3fca4d JG |
1808 | const size_t filter_size = sizeof( |
1809 | struct lttng_filter_bytecode) | |
1810 | + filter->len; | |
1811 | ||
1812 | filter_copy = zmalloc(filter_size); | |
971da06a | 1813 | if (!filter_copy) { |
a745883a | 1814 | ret = LTTNG_ERR_NOMEM; |
971da06a | 1815 | } |
0a3fca4d | 1816 | memcpy(filter_copy, filter, filter_size); |
971da06a | 1817 | |
d75bffee JG |
1818 | filter_expression_copy = |
1819 | strdup(filter_expression); | |
1820 | if (!filter_expression) { | |
1821 | ret = LTTNG_ERR_NOMEM; | |
0a3fca4d JG |
1822 | } |
1823 | ||
1824 | if (!filter_expression_copy || !filter_copy) { | |
1825 | free(filter_expression_copy); | |
1826 | free(filter_copy); | |
1827 | goto error; | |
d75bffee | 1828 | } |
971da06a JG |
1829 | } |
1830 | ||
9732459c | 1831 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 1832 | (char *) default_chan_name, |
d75bffee JG |
1833 | &uevent, filter_expression_copy, |
1834 | filter_copy, NULL, wpipe); | |
971da06a JG |
1835 | } |
1836 | ||
f20baf8e DG |
1837 | if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) { |
1838 | goto error; | |
1839 | } | |
1840 | ||
1841 | /* The wild card * means that everything should be enabled. */ | |
1842 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
d75bffee JG |
1843 | ret = event_agent_enable_all(usess, agt, event, filter, |
1844 | filter_expression); | |
f20baf8e | 1845 | } else { |
d75bffee JG |
1846 | ret = event_agent_enable(usess, agt, event, filter, |
1847 | filter_expression); | |
f20baf8e | 1848 | } |
0a3fca4d JG |
1849 | filter = NULL; |
1850 | filter_expression = NULL; | |
f20baf8e DG |
1851 | if (ret != LTTNG_OK) { |
1852 | goto error; | |
1853 | } | |
1854 | ||
1855 | break; | |
1856 | } | |
2f77fc4b | 1857 | default: |
f73fabfd | 1858 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1859 | goto error; |
1860 | } | |
1861 | ||
f73fabfd | 1862 | ret = LTTNG_OK; |
2f77fc4b DG |
1863 | |
1864 | error: | |
49d21f93 MD |
1865 | free(filter_expression); |
1866 | free(filter); | |
1867 | free(exclusion); | |
2223c96f | 1868 | rcu_read_unlock(); |
2f77fc4b DG |
1869 | return ret; |
1870 | } | |
1871 | ||
9732459c JG |
1872 | /* |
1873 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
1874 | * We own filter, exclusion, and filter_expression. | |
1875 | */ | |
1876 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
1877 | char *channel_name, struct lttng_event *event, | |
1878 | char *filter_expression, | |
1879 | struct lttng_filter_bytecode *filter, | |
1880 | struct lttng_event_exclusion *exclusion, | |
1881 | int wpipe) | |
1882 | { | |
1883 | return _cmd_enable_event(session, domain, channel_name, event, | |
1884 | filter_expression, filter, exclusion, wpipe, false); | |
1885 | } | |
1886 | ||
1887 | /* | |
1888 | * Enable an event which is internal to LTTng. An internal should | |
1889 | * never be made visible to clients and are immune to checks such as | |
1890 | * reserved names. | |
1891 | */ | |
1892 | static int cmd_enable_event_internal(struct ltt_session *session, | |
1893 | struct lttng_domain *domain, | |
1894 | char *channel_name, struct lttng_event *event, | |
1895 | char *filter_expression, | |
1896 | struct lttng_filter_bytecode *filter, | |
1897 | struct lttng_event_exclusion *exclusion, | |
1898 | int wpipe) | |
1899 | { | |
1900 | return _cmd_enable_event(session, domain, channel_name, event, | |
1901 | filter_expression, filter, exclusion, wpipe, true); | |
1902 | } | |
1903 | ||
2f77fc4b DG |
1904 | /* |
1905 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
1906 | */ | |
1907 | ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
1908 | { | |
1909 | int ret; | |
1910 | ssize_t nb_events = 0; | |
1911 | ||
1912 | switch (domain) { | |
1913 | case LTTNG_DOMAIN_KERNEL: | |
1914 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
1915 | if (nb_events < 0) { | |
f73fabfd | 1916 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
1917 | goto error; |
1918 | } | |
1919 | break; | |
1920 | case LTTNG_DOMAIN_UST: | |
1921 | nb_events = ust_app_list_events(events); | |
1922 | if (nb_events < 0) { | |
f73fabfd | 1923 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
1924 | goto error; |
1925 | } | |
1926 | break; | |
5cdb6027 | 1927 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 1928 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1929 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 1930 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
1931 | if (nb_events < 0) { |
1932 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
1933 | goto error; | |
1934 | } | |
1935 | break; | |
2f77fc4b | 1936 | default: |
f73fabfd | 1937 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1938 | goto error; |
1939 | } | |
1940 | ||
1941 | return nb_events; | |
1942 | ||
1943 | error: | |
1944 | /* Return negative value to differentiate return code */ | |
1945 | return -ret; | |
1946 | } | |
1947 | ||
1948 | /* | |
1949 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
1950 | */ | |
1951 | ssize_t cmd_list_tracepoint_fields(int domain, | |
1952 | struct lttng_event_field **fields) | |
1953 | { | |
1954 | int ret; | |
1955 | ssize_t nb_fields = 0; | |
1956 | ||
1957 | switch (domain) { | |
1958 | case LTTNG_DOMAIN_UST: | |
1959 | nb_fields = ust_app_list_event_fields(fields); | |
1960 | if (nb_fields < 0) { | |
f73fabfd | 1961 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
1962 | goto error; |
1963 | } | |
1964 | break; | |
1965 | case LTTNG_DOMAIN_KERNEL: | |
1966 | default: /* fall-through */ | |
f73fabfd | 1967 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1968 | goto error; |
1969 | } | |
1970 | ||
1971 | return nb_fields; | |
1972 | ||
1973 | error: | |
1974 | /* Return negative value to differentiate return code */ | |
1975 | return -ret; | |
1976 | } | |
1977 | ||
834978fd DG |
1978 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
1979 | { | |
1980 | return syscall_table_list(events); | |
1981 | } | |
1982 | ||
a5dfbb9d MD |
1983 | /* |
1984 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
1985 | * | |
1986 | * Called with session lock held. | |
1987 | */ | |
1988 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
1989 | int domain, int32_t **pids) | |
1990 | { | |
1991 | int ret; | |
1992 | ssize_t nr_pids = 0; | |
1993 | ||
1994 | switch (domain) { | |
1995 | case LTTNG_DOMAIN_KERNEL: | |
1996 | { | |
1997 | struct ltt_kernel_session *ksess; | |
1998 | ||
1999 | ksess = session->kernel_session; | |
2000 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2001 | if (nr_pids < 0) { | |
2002 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2003 | goto error; | |
2004 | } | |
2005 | break; | |
2006 | } | |
2007 | case LTTNG_DOMAIN_UST: | |
2008 | { | |
2009 | struct ltt_ust_session *usess; | |
2010 | ||
2011 | usess = session->ust_session; | |
2012 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2013 | if (nr_pids < 0) { | |
2014 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2015 | goto error; | |
2016 | } | |
2017 | break; | |
2018 | } | |
2019 | case LTTNG_DOMAIN_LOG4J: | |
2020 | case LTTNG_DOMAIN_JUL: | |
2021 | case LTTNG_DOMAIN_PYTHON: | |
2022 | default: | |
2023 | ret = LTTNG_ERR_UND; | |
2024 | goto error; | |
2025 | } | |
2026 | ||
2027 | return nr_pids; | |
2028 | ||
2029 | error: | |
2030 | /* Return negative value to differentiate return code */ | |
2031 | return -ret; | |
2032 | } | |
2033 | ||
2f77fc4b DG |
2034 | /* |
2035 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2036 | * |
2037 | * Called with session mutex held. | |
2f77fc4b DG |
2038 | */ |
2039 | int cmd_start_trace(struct ltt_session *session) | |
2040 | { | |
2041 | int ret; | |
cde3e505 | 2042 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2043 | struct ltt_kernel_session *ksession; |
2044 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2045 | |
2046 | assert(session); | |
2047 | ||
2048 | /* Ease our life a bit ;) */ | |
2049 | ksession = session->kernel_session; | |
2050 | usess = session->ust_session; | |
2051 | ||
8382cf6f DG |
2052 | /* Is the session already started? */ |
2053 | if (session->active) { | |
f73fabfd | 2054 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2055 | goto error; |
2056 | } | |
2057 | ||
cde3e505 DG |
2058 | /* |
2059 | * Starting a session without channel is useless since after that it's not | |
2060 | * possible to enable channel thus inform the client. | |
2061 | */ | |
2062 | if (usess && usess->domain_global.channels) { | |
a9e41044 | 2063 | rcu_read_lock(); |
cde3e505 | 2064 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); |
a9e41044 | 2065 | rcu_read_unlock(); |
cde3e505 DG |
2066 | } |
2067 | if (ksession) { | |
2068 | nb_chan += ksession->channel_count; | |
2069 | } | |
2070 | if (!nb_chan) { | |
2071 | ret = LTTNG_ERR_NO_CHANNEL; | |
2072 | goto error; | |
2073 | } | |
2074 | ||
2f77fc4b DG |
2075 | /* Kernel tracing */ |
2076 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2077 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2078 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2079 | goto error; |
2080 | } | |
2f77fc4b DG |
2081 | } |
2082 | ||
2083 | /* Flag session that trace should start automatically */ | |
2084 | if (usess) { | |
14fb1ebe DG |
2085 | /* |
2086 | * Even though the start trace might fail, flag this session active so | |
2087 | * other application coming in are started by default. | |
2088 | */ | |
2089 | usess->active = 1; | |
2f77fc4b DG |
2090 | |
2091 | ret = ust_app_start_trace_all(usess); | |
2092 | if (ret < 0) { | |
f73fabfd | 2093 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2094 | goto error; |
2095 | } | |
2096 | } | |
2097 | ||
8382cf6f DG |
2098 | /* Flag this after a successful start. */ |
2099 | session->has_been_started = 1; | |
2100 | session->active = 1; | |
9b6c7ec5 | 2101 | |
f73fabfd | 2102 | ret = LTTNG_OK; |
2f77fc4b DG |
2103 | |
2104 | error: | |
2105 | return ret; | |
2106 | } | |
2107 | ||
2108 | /* | |
2109 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2110 | */ | |
2111 | int cmd_stop_trace(struct ltt_session *session) | |
2112 | { | |
2113 | int ret; | |
2114 | struct ltt_kernel_channel *kchan; | |
2115 | struct ltt_kernel_session *ksession; | |
2116 | struct ltt_ust_session *usess; | |
2117 | ||
2118 | assert(session); | |
2119 | ||
2120 | /* Short cut */ | |
2121 | ksession = session->kernel_session; | |
2122 | usess = session->ust_session; | |
2123 | ||
8382cf6f DG |
2124 | /* Session is not active. Skip everythong and inform the client. */ |
2125 | if (!session->active) { | |
f73fabfd | 2126 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2127 | goto error; |
2128 | } | |
2129 | ||
2f77fc4b | 2130 | /* Kernel tracer */ |
14fb1ebe | 2131 | if (ksession && ksession->active) { |
2f77fc4b DG |
2132 | DBG("Stop kernel tracing"); |
2133 | ||
2134 | /* Flush metadata if exist */ | |
2135 | if (ksession->metadata_stream_fd >= 0) { | |
2136 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2137 | if (ret < 0) { | |
2138 | ERR("Kernel metadata flush failed"); | |
2139 | } | |
2140 | } | |
2141 | ||
2142 | /* Flush all buffers before stopping */ | |
2143 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2144 | ret = kernel_flush_buffer(kchan); | |
2145 | if (ret < 0) { | |
2146 | ERR("Kernel flush buffer error"); | |
2147 | } | |
2148 | } | |
2149 | ||
2150 | ret = kernel_stop_session(ksession); | |
2151 | if (ret < 0) { | |
f73fabfd | 2152 | ret = LTTNG_ERR_KERN_STOP_FAIL; |
2f77fc4b DG |
2153 | goto error; |
2154 | } | |
2155 | ||
2156 | kernel_wait_quiescent(kernel_tracer_fd); | |
9b6c7ec5 | 2157 | |
14fb1ebe | 2158 | ksession->active = 0; |
2f77fc4b DG |
2159 | } |
2160 | ||
14fb1ebe DG |
2161 | if (usess && usess->active) { |
2162 | /* | |
2163 | * Even though the stop trace might fail, flag this session inactive so | |
2164 | * other application coming in are not started by default. | |
2165 | */ | |
2166 | usess->active = 0; | |
2f77fc4b DG |
2167 | |
2168 | ret = ust_app_stop_trace_all(usess); | |
2169 | if (ret < 0) { | |
f73fabfd | 2170 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2171 | goto error; |
2172 | } | |
2173 | } | |
2174 | ||
8382cf6f DG |
2175 | /* Flag inactive after a successful stop. */ |
2176 | session->active = 0; | |
f73fabfd | 2177 | ret = LTTNG_OK; |
2f77fc4b DG |
2178 | |
2179 | error: | |
2180 | return ret; | |
2181 | } | |
2182 | ||
2183 | /* | |
2184 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2185 | */ | |
bda32d56 JG |
2186 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2187 | struct lttng_uri *uris) | |
2f77fc4b DG |
2188 | { |
2189 | int ret, i; | |
2190 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2191 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2192 | |
2193 | assert(session); | |
2194 | assert(uris); | |
2195 | assert(nb_uri > 0); | |
2196 | ||
8382cf6f DG |
2197 | /* Can't set consumer URI if the session is active. */ |
2198 | if (session->active) { | |
f73fabfd | 2199 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2200 | goto error; |
2201 | } | |
2202 | ||
bda32d56 | 2203 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2204 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2205 | ret = add_uri_to_consumer(session->consumer, |
2206 | &uris[i], 0, session->name); | |
a74934ba | 2207 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2208 | goto error; |
2209 | } | |
2f77fc4b DG |
2210 | } |
2211 | ||
bda32d56 JG |
2212 | /* Set UST session URIs */ |
2213 | if (session->ust_session) { | |
2214 | for (i = 0; i < nb_uri; i++) { | |
2215 | ret = add_uri_to_consumer( | |
2216 | session->ust_session->consumer, | |
2217 | &uris[i], LTTNG_DOMAIN_UST, | |
2218 | session->name); | |
2219 | if (ret != LTTNG_OK) { | |
2220 | goto error; | |
2221 | } | |
2222 | } | |
2223 | } | |
2224 | ||
2225 | /* Set kernel session URIs */ | |
2226 | if (session->kernel_session) { | |
2227 | for (i = 0; i < nb_uri; i++) { | |
2228 | ret = add_uri_to_consumer( | |
2229 | session->kernel_session->consumer, | |
2230 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2231 | session->name); | |
2232 | if (ret != LTTNG_OK) { | |
2233 | goto error; | |
2234 | } | |
2235 | } | |
2236 | } | |
2237 | ||
7ab70fe0 DG |
2238 | /* |
2239 | * Make sure to set the session in output mode after we set URI since a | |
2240 | * session can be created without URL (thus flagged in no output mode). | |
2241 | */ | |
2242 | session->output_traces = 1; | |
2243 | if (ksess) { | |
2244 | ksess->output_traces = 1; | |
bda32d56 JG |
2245 | } |
2246 | ||
2247 | if (usess) { | |
7ab70fe0 DG |
2248 | usess->output_traces = 1; |
2249 | } | |
2250 | ||
2f77fc4b | 2251 | /* All good! */ |
f73fabfd | 2252 | ret = LTTNG_OK; |
2f77fc4b DG |
2253 | |
2254 | error: | |
2255 | return ret; | |
2256 | } | |
2257 | ||
2258 | /* | |
2259 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2260 | */ | |
2261 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2262 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2263 | { |
2264 | int ret; | |
2f77fc4b DG |
2265 | struct ltt_session *session; |
2266 | ||
2267 | assert(name); | |
2bba9e53 | 2268 | assert(creds); |
785d2d0d | 2269 | |
2f77fc4b DG |
2270 | /* |
2271 | * Verify if the session already exist | |
2272 | * | |
2273 | * XXX: There is no need for the session lock list here since the caller | |
2274 | * (process_client_msg) is holding it. We might want to change that so a | |
2275 | * single command does not lock the entire session list. | |
2276 | */ | |
2277 | session = session_find_by_name(name); | |
2278 | if (session != NULL) { | |
f73fabfd | 2279 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2280 | goto find_error; |
2281 | } | |
2282 | ||
2283 | /* Create tracing session in the registry */ | |
dec56f6c | 2284 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2285 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2286 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2287 | goto session_error; |
2288 | } | |
2289 | ||
2290 | /* | |
2291 | * Get the newly created session pointer back | |
2292 | * | |
2293 | * XXX: There is no need for the session lock list here since the caller | |
2294 | * (process_client_msg) is holding it. We might want to change that so a | |
2295 | * single command does not lock the entire session list. | |
2296 | */ | |
2297 | session = session_find_by_name(name); | |
2298 | assert(session); | |
2299 | ||
ecc48a90 | 2300 | session->live_timer = live_timer; |
2f77fc4b DG |
2301 | /* Create default consumer output for the session not yet created. */ |
2302 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2303 | if (session->consumer == NULL) { | |
f73fabfd | 2304 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2305 | goto consumer_error; |
2306 | } | |
2307 | ||
2bba9e53 | 2308 | if (uris) { |
bda32d56 | 2309 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2310 | if (ret != LTTNG_OK) { |
2311 | goto consumer_error; | |
2312 | } | |
2313 | session->output_traces = 1; | |
2314 | } else { | |
2315 | session->output_traces = 0; | |
2316 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2317 | } |
2318 | ||
2319 | session->consumer->enabled = 1; | |
2320 | ||
f73fabfd | 2321 | return LTTNG_OK; |
2f77fc4b DG |
2322 | |
2323 | consumer_error: | |
2324 | session_destroy(session); | |
2325 | session_error: | |
2326 | find_error: | |
2327 | return ret; | |
2328 | } | |
2329 | ||
27babd3a DG |
2330 | /* |
2331 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2332 | */ | |
2333 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2334 | size_t nb_uri, lttng_sock_cred *creds) | |
2335 | { | |
2336 | int ret; | |
2337 | struct ltt_session *session; | |
2338 | struct snapshot_output *new_output = NULL; | |
2339 | ||
2340 | assert(name); | |
2341 | assert(creds); | |
2342 | ||
2343 | /* | |
2344 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2345 | * received are for a default snapshot output if one. | |
2346 | */ | |
ecc48a90 | 2347 | ret = cmd_create_session_uri(name, NULL, 0, creds, -1); |
27babd3a DG |
2348 | if (ret != LTTNG_OK) { |
2349 | goto error; | |
2350 | } | |
2351 | ||
2352 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2353 | session = session_find_by_name(name); | |
2354 | assert(session); | |
2355 | ||
2356 | /* Flag session for snapshot mode. */ | |
2357 | session->snapshot_mode = 1; | |
2358 | ||
2359 | /* Skip snapshot output creation if no URI is given. */ | |
2360 | if (nb_uri == 0) { | |
2361 | goto end; | |
2362 | } | |
2363 | ||
2364 | new_output = snapshot_output_alloc(); | |
2365 | if (!new_output) { | |
2366 | ret = LTTNG_ERR_NOMEM; | |
2367 | goto error_snapshot_alloc; | |
2368 | } | |
2369 | ||
2370 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2371 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2372 | if (ret < 0) { | |
2373 | if (ret == -ENOMEM) { | |
2374 | ret = LTTNG_ERR_NOMEM; | |
2375 | } else { | |
2376 | ret = LTTNG_ERR_INVALID; | |
2377 | } | |
2378 | goto error_snapshot; | |
2379 | } | |
2380 | ||
2381 | rcu_read_lock(); | |
2382 | snapshot_add_output(&session->snapshot, new_output); | |
2383 | rcu_read_unlock(); | |
2384 | ||
2385 | end: | |
2386 | return LTTNG_OK; | |
2387 | ||
2388 | error_snapshot: | |
2389 | snapshot_output_destroy(new_output); | |
2390 | error_snapshot_alloc: | |
2391 | session_destroy(session); | |
2392 | error: | |
2393 | return ret; | |
2394 | } | |
2395 | ||
2f77fc4b DG |
2396 | /* |
2397 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2398 | * |
2399 | * Called with session lock held. | |
2f77fc4b DG |
2400 | */ |
2401 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2402 | { | |
2403 | int ret; | |
2404 | struct ltt_ust_session *usess; | |
2405 | struct ltt_kernel_session *ksess; | |
2406 | ||
2407 | /* Safety net */ | |
2408 | assert(session); | |
2409 | ||
2410 | usess = session->ust_session; | |
2411 | ksess = session->kernel_session; | |
2412 | ||
2413 | /* Clean kernel session teardown */ | |
2414 | kernel_destroy_session(ksess); | |
2415 | ||
2416 | /* UST session teardown */ | |
2417 | if (usess) { | |
2418 | /* Close any relayd session */ | |
2419 | consumer_output_send_destroy_relayd(usess->consumer); | |
2420 | ||
2421 | /* Destroy every UST application related to this session. */ | |
2422 | ret = ust_app_destroy_trace_all(usess); | |
2423 | if (ret) { | |
2424 | ERR("Error in ust_app_destroy_trace_all"); | |
2425 | } | |
2426 | ||
2427 | /* Clean up the rest. */ | |
2428 | trace_ust_destroy_session(usess); | |
2429 | } | |
2430 | ||
2431 | /* | |
2432 | * Must notify the kernel thread here to update it's poll set in order to | |
2433 | * remove the channel(s)' fd just destroyed. | |
2434 | */ | |
2435 | ret = notify_thread_pipe(wpipe); | |
2436 | if (ret < 0) { | |
2437 | PERROR("write kernel poll pipe"); | |
2438 | } | |
2439 | ||
2440 | ret = session_destroy(session); | |
2441 | ||
2442 | return ret; | |
2443 | } | |
2444 | ||
2445 | /* | |
2446 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2447 | */ | |
2448 | int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2449 | { | |
2450 | int ret; | |
2451 | ||
2452 | switch (domain) { | |
2453 | case LTTNG_DOMAIN_KERNEL: | |
2454 | { | |
2455 | struct lttng_kernel_calibrate kcalibrate; | |
2456 | ||
2e84128e DG |
2457 | switch (calibrate->type) { |
2458 | case LTTNG_CALIBRATE_FUNCTION: | |
2459 | default: | |
2460 | /* Default and only possible calibrate option. */ | |
2461 | kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE; | |
2462 | break; | |
2463 | } | |
2464 | ||
2f77fc4b DG |
2465 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); |
2466 | if (ret < 0) { | |
f73fabfd | 2467 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2f77fc4b DG |
2468 | goto error; |
2469 | } | |
2470 | break; | |
2471 | } | |
2472 | case LTTNG_DOMAIN_UST: | |
2473 | { | |
2474 | struct lttng_ust_calibrate ucalibrate; | |
2475 | ||
2e84128e DG |
2476 | switch (calibrate->type) { |
2477 | case LTTNG_CALIBRATE_FUNCTION: | |
2478 | default: | |
2479 | /* Default and only possible calibrate option. */ | |
2480 | ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT; | |
2481 | break; | |
2482 | } | |
2483 | ||
2f77fc4b DG |
2484 | ret = ust_app_calibrate_glb(&ucalibrate); |
2485 | if (ret < 0) { | |
f73fabfd | 2486 | ret = LTTNG_ERR_UST_CALIBRATE_FAIL; |
2f77fc4b DG |
2487 | goto error; |
2488 | } | |
2489 | break; | |
2490 | } | |
2491 | default: | |
f73fabfd | 2492 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2493 | goto error; |
2494 | } | |
2495 | ||
f73fabfd | 2496 | ret = LTTNG_OK; |
2f77fc4b DG |
2497 | |
2498 | error: | |
2499 | return ret; | |
2500 | } | |
2501 | ||
2502 | /* | |
2503 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2504 | */ | |
2505 | int cmd_register_consumer(struct ltt_session *session, int domain, | |
2506 | const char *sock_path, struct consumer_data *cdata) | |
2507 | { | |
2508 | int ret, sock; | |
dd81b457 | 2509 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2510 | |
2511 | assert(session); | |
2512 | assert(cdata); | |
2513 | assert(sock_path); | |
2514 | ||
2515 | switch (domain) { | |
2516 | case LTTNG_DOMAIN_KERNEL: | |
2517 | { | |
2518 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2519 | ||
2520 | assert(ksess); | |
2521 | ||
2522 | /* Can't register a consumer if there is already one */ | |
2523 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2524 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2525 | goto error; |
2526 | } | |
2527 | ||
2528 | sock = lttcomm_connect_unix_sock(sock_path); | |
2529 | if (sock < 0) { | |
f73fabfd | 2530 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2531 | goto error; |
2532 | } | |
4ce514c4 | 2533 | cdata->cmd_sock = sock; |
2f77fc4b | 2534 | |
4ce514c4 | 2535 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2536 | if (socket == NULL) { |
f66c074c DG |
2537 | ret = close(sock); |
2538 | if (ret < 0) { | |
2539 | PERROR("close register consumer"); | |
2540 | } | |
4ce514c4 | 2541 | cdata->cmd_sock = -1; |
f73fabfd | 2542 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2543 | goto error; |
2544 | } | |
2545 | ||
2546 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2547 | if (socket->lock == NULL) { | |
2548 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2549 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2550 | goto error; |
2551 | } | |
2552 | pthread_mutex_init(socket->lock, NULL); | |
2553 | socket->registered = 1; | |
2554 | ||
2555 | rcu_read_lock(); | |
2556 | consumer_add_socket(socket, ksess->consumer); | |
2557 | rcu_read_unlock(); | |
2558 | ||
2559 | pthread_mutex_lock(&cdata->pid_mutex); | |
2560 | cdata->pid = -1; | |
2561 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2562 | ||
2563 | break; | |
2564 | } | |
2565 | default: | |
2566 | /* TODO: Userspace tracing */ | |
f73fabfd | 2567 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2568 | goto error; |
2569 | } | |
2570 | ||
dd81b457 | 2571 | return LTTNG_OK; |
2f77fc4b DG |
2572 | |
2573 | error: | |
dd81b457 DG |
2574 | if (socket) { |
2575 | consumer_destroy_socket(socket); | |
2576 | } | |
2f77fc4b DG |
2577 | return ret; |
2578 | } | |
2579 | ||
2580 | /* | |
2581 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2582 | */ | |
2583 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2584 | struct lttng_domain **domains) | |
2585 | { | |
2586 | int ret, index = 0; | |
2587 | ssize_t nb_dom = 0; | |
fefd409b DG |
2588 | struct agent *agt; |
2589 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2590 | |
2591 | if (session->kernel_session != NULL) { | |
2592 | DBG3("Listing domains found kernel domain"); | |
2593 | nb_dom++; | |
2594 | } | |
2595 | ||
2596 | if (session->ust_session != NULL) { | |
2597 | DBG3("Listing domains found UST global domain"); | |
2598 | nb_dom++; | |
3c6a091f | 2599 | |
e0a74f01 | 2600 | rcu_read_lock(); |
fefd409b DG |
2601 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2602 | agt, node.node) { | |
2603 | if (agt->being_used) { | |
2604 | nb_dom++; | |
2605 | } | |
3c6a091f | 2606 | } |
e0a74f01 | 2607 | rcu_read_unlock(); |
2f77fc4b DG |
2608 | } |
2609 | ||
fa64dfb4 JG |
2610 | if (!nb_dom) { |
2611 | goto end; | |
2612 | } | |
2613 | ||
2f77fc4b DG |
2614 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2615 | if (*domains == NULL) { | |
f73fabfd | 2616 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2617 | goto error; |
2618 | } | |
2619 | ||
2620 | if (session->kernel_session != NULL) { | |
2621 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
bd3381e3 PP |
2622 | |
2623 | /* Kernel session buffer type is always GLOBAL */ | |
2624 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2625 | ||
2f77fc4b DG |
2626 | index++; |
2627 | } | |
2628 | ||
2629 | if (session->ust_session != NULL) { | |
2630 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2631 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2632 | index++; |
3c6a091f | 2633 | |
e0a74f01 | 2634 | rcu_read_lock(); |
fefd409b DG |
2635 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2636 | agt, node.node) { | |
2637 | if (agt->being_used) { | |
2638 | (*domains)[index].type = agt->domain; | |
2639 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2640 | index++; | |
2641 | } | |
3c6a091f | 2642 | } |
e0a74f01 | 2643 | rcu_read_unlock(); |
2f77fc4b | 2644 | } |
fa64dfb4 | 2645 | end: |
2f77fc4b DG |
2646 | return nb_dom; |
2647 | ||
2648 | error: | |
f73fabfd DG |
2649 | /* Return negative value to differentiate return code */ |
2650 | return -ret; | |
2f77fc4b DG |
2651 | } |
2652 | ||
2653 | ||
2654 | /* | |
2655 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2656 | */ | |
2657 | ssize_t cmd_list_channels(int domain, struct ltt_session *session, | |
2658 | struct lttng_channel **channels) | |
2659 | { | |
2660 | int ret; | |
2661 | ssize_t nb_chan = 0; | |
2662 | ||
2663 | switch (domain) { | |
2664 | case LTTNG_DOMAIN_KERNEL: | |
2665 | if (session->kernel_session != NULL) { | |
2666 | nb_chan = session->kernel_session->channel_count; | |
2667 | } | |
2668 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 DG |
2669 | if (nb_chan <= 0) { |
2670 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; | |
2671 | } | |
2f77fc4b DG |
2672 | break; |
2673 | case LTTNG_DOMAIN_UST: | |
2674 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2675 | rcu_read_lock(); |
2f77fc4b | 2676 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2677 | session->ust_session->domain_global.channels); |
2678 | rcu_read_unlock(); | |
2f77fc4b DG |
2679 | } |
2680 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2681 | if (nb_chan < 0) { |
c7d620a2 | 2682 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
ade7ce52 | 2683 | goto error; |
c7d620a2 | 2684 | } |
2f77fc4b DG |
2685 | break; |
2686 | default: | |
f73fabfd | 2687 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2688 | goto error; |
2689 | } | |
2690 | ||
2691 | if (nb_chan > 0) { | |
2692 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
2693 | if (*channels == NULL) { | |
f73fabfd | 2694 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2695 | goto error; |
2696 | } | |
2697 | ||
2698 | list_lttng_channels(domain, session, *channels); | |
2f77fc4b DG |
2699 | } |
2700 | ||
2701 | return nb_chan; | |
2702 | ||
2703 | error: | |
f73fabfd DG |
2704 | /* Return negative value to differentiate return code */ |
2705 | return -ret; | |
2f77fc4b DG |
2706 | } |
2707 | ||
2708 | /* | |
2709 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2710 | */ | |
2711 | ssize_t cmd_list_events(int domain, struct ltt_session *session, | |
2712 | char *channel_name, struct lttng_event **events) | |
2713 | { | |
2714 | int ret = 0; | |
2715 | ssize_t nb_event = 0; | |
2716 | ||
2717 | switch (domain) { | |
2718 | case LTTNG_DOMAIN_KERNEL: | |
2719 | if (session->kernel_session != NULL) { | |
2720 | nb_event = list_lttng_kernel_events(channel_name, | |
2721 | session->kernel_session, events); | |
2722 | } | |
2723 | break; | |
2724 | case LTTNG_DOMAIN_UST: | |
2725 | { | |
2726 | if (session->ust_session != NULL) { | |
2727 | nb_event = list_lttng_ust_global_events(channel_name, | |
2728 | &session->ust_session->domain_global, events); | |
2729 | } | |
2730 | break; | |
2731 | } | |
5cdb6027 | 2732 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2733 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2734 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 2735 | if (session->ust_session) { |
fefd409b DG |
2736 | struct lttng_ht_iter iter; |
2737 | struct agent *agt; | |
2738 | ||
b11feea5 | 2739 | rcu_read_lock(); |
fefd409b DG |
2740 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
2741 | &iter.iter, agt, node.node) { | |
2742 | nb_event = list_lttng_agent_events(agt, events); | |
2743 | } | |
b11feea5 | 2744 | rcu_read_unlock(); |
3c6a091f DG |
2745 | } |
2746 | break; | |
2f77fc4b | 2747 | default: |
f73fabfd | 2748 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2749 | goto error; |
2750 | } | |
2751 | ||
f73fabfd | 2752 | return nb_event; |
2f77fc4b DG |
2753 | |
2754 | error: | |
f73fabfd DG |
2755 | /* Return negative value to differentiate return code */ |
2756 | return -ret; | |
2f77fc4b DG |
2757 | } |
2758 | ||
2759 | /* | |
2760 | * Using the session list, filled a lttng_session array to send back to the | |
2761 | * client for session listing. | |
2762 | * | |
2763 | * The session list lock MUST be acquired before calling this function. Use | |
2764 | * session_lock_list() and session_unlock_list(). | |
2765 | */ | |
2766 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
2767 | gid_t gid) | |
2768 | { | |
2769 | int ret; | |
2770 | unsigned int i = 0; | |
2771 | struct ltt_session *session; | |
2772 | struct ltt_session_list *list = session_get_list(); | |
2773 | ||
2774 | DBG("Getting all available session for UID %d GID %d", | |
2775 | uid, gid); | |
2776 | /* | |
2777 | * Iterate over session list and append data after the control struct in | |
2778 | * the buffer. | |
2779 | */ | |
2780 | cds_list_for_each_entry(session, &list->head, list) { | |
2781 | /* | |
2782 | * Only list the sessions the user can control. | |
2783 | */ | |
2784 | if (!session_access_ok(session, uid, gid)) { | |
2785 | continue; | |
2786 | } | |
2787 | ||
2788 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2789 | struct ltt_ust_session *usess = session->ust_session; | |
2790 | ||
2791 | if (session->consumer->type == CONSUMER_DST_NET || | |
2792 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
2793 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
2794 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 2795 | sizeof(sessions[i].path), session); |
2f77fc4b | 2796 | } else { |
dec56f6c | 2797 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
2798 | session->consumer->dst.trace_path); |
2799 | } | |
2800 | if (ret < 0) { | |
2801 | PERROR("snprintf session path"); | |
2802 | continue; | |
2803 | } | |
2804 | ||
2805 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
2806 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 2807 | sessions[i].enabled = session->active; |
2cbf8fed | 2808 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 2809 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
2810 | i++; |
2811 | } | |
2812 | } | |
2813 | ||
806e2684 | 2814 | /* |
6d805429 | 2815 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 2816 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 2817 | */ |
6d805429 | 2818 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
2819 | { |
2820 | int ret; | |
2821 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2822 | struct ltt_ust_session *usess = session->ust_session; | |
2823 | ||
2824 | assert(session); | |
2825 | ||
2826 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 2827 | if (session->active) { |
806e2684 DG |
2828 | ret = LTTNG_ERR_SESSION_STARTED; |
2829 | goto error; | |
3a89d11a DG |
2830 | } else { |
2831 | /* | |
2832 | * If stopped, just make sure we've started before else the above call | |
2833 | * will always send that there is data pending. | |
2834 | * | |
2835 | * The consumer assumes that when the data pending command is received, | |
2836 | * the trace has been started before or else no output data is written | |
2837 | * by the streams which is a condition for data pending. So, this is | |
2838 | * *VERY* important that we don't ask the consumer before a start | |
2839 | * trace. | |
2840 | */ | |
8382cf6f | 2841 | if (!session->has_been_started) { |
3a89d11a DG |
2842 | ret = 0; |
2843 | goto error; | |
2844 | } | |
806e2684 DG |
2845 | } |
2846 | ||
2847 | if (ksess && ksess->consumer) { | |
6d805429 DG |
2848 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
2849 | if (ret == 1) { | |
806e2684 DG |
2850 | /* Data is still being extracted for the kernel. */ |
2851 | goto error; | |
2852 | } | |
2853 | } | |
2854 | ||
2855 | if (usess && usess->consumer) { | |
6d805429 DG |
2856 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
2857 | if (ret == 1) { | |
806e2684 DG |
2858 | /* Data is still being extracted for the kernel. */ |
2859 | goto error; | |
2860 | } | |
2861 | } | |
2862 | ||
2863 | /* Data is ready to be read by a viewer */ | |
6d805429 | 2864 | ret = 0; |
806e2684 DG |
2865 | |
2866 | error: | |
2867 | return ret; | |
2868 | } | |
2869 | ||
6dc3064a DG |
2870 | /* |
2871 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
2872 | * | |
2873 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
2874 | */ | |
2875 | int cmd_snapshot_add_output(struct ltt_session *session, | |
2876 | struct lttng_snapshot_output *output, uint32_t *id) | |
2877 | { | |
2878 | int ret; | |
2879 | struct snapshot_output *new_output; | |
2880 | ||
2881 | assert(session); | |
2882 | assert(output); | |
2883 | ||
2884 | DBG("Cmd snapshot add output for session %s", session->name); | |
2885 | ||
2886 | /* | |
d3f14b8a MD |
2887 | * Permission denied to create an output if the session is not |
2888 | * set in no output mode. | |
6dc3064a DG |
2889 | */ |
2890 | if (session->output_traces) { | |
2891 | ret = LTTNG_ERR_EPERM; | |
2892 | goto error; | |
2893 | } | |
2894 | ||
2895 | /* Only one output is allowed until we have the "tee" feature. */ | |
2896 | if (session->snapshot.nb_output == 1) { | |
2897 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
2898 | goto error; | |
2899 | } | |
2900 | ||
2901 | new_output = snapshot_output_alloc(); | |
2902 | if (!new_output) { | |
2903 | ret = LTTNG_ERR_NOMEM; | |
2904 | goto error; | |
2905 | } | |
2906 | ||
2907 | ret = snapshot_output_init(output->max_size, output->name, | |
2908 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
2909 | &session->snapshot); | |
2910 | if (ret < 0) { | |
2911 | if (ret == -ENOMEM) { | |
2912 | ret = LTTNG_ERR_NOMEM; | |
2913 | } else { | |
2914 | ret = LTTNG_ERR_INVALID; | |
2915 | } | |
2916 | goto free_error; | |
2917 | } | |
2918 | ||
6dc3064a DG |
2919 | rcu_read_lock(); |
2920 | snapshot_add_output(&session->snapshot, new_output); | |
2921 | if (id) { | |
2922 | *id = new_output->id; | |
2923 | } | |
2924 | rcu_read_unlock(); | |
2925 | ||
2926 | return LTTNG_OK; | |
2927 | ||
2928 | free_error: | |
2929 | snapshot_output_destroy(new_output); | |
2930 | error: | |
2931 | return ret; | |
2932 | } | |
2933 | ||
2934 | /* | |
2935 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
2936 | * | |
2937 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
2938 | */ | |
2939 | int cmd_snapshot_del_output(struct ltt_session *session, | |
2940 | struct lttng_snapshot_output *output) | |
2941 | { | |
2942 | int ret; | |
eb240553 | 2943 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
2944 | |
2945 | assert(session); | |
2946 | assert(output); | |
2947 | ||
6dc3064a DG |
2948 | rcu_read_lock(); |
2949 | ||
2950 | /* | |
d3f14b8a MD |
2951 | * Permission denied to create an output if the session is not |
2952 | * set in no output mode. | |
6dc3064a DG |
2953 | */ |
2954 | if (session->output_traces) { | |
2955 | ret = LTTNG_ERR_EPERM; | |
2956 | goto error; | |
2957 | } | |
2958 | ||
eb240553 DG |
2959 | if (output->id) { |
2960 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
2961 | session->name); | |
2962 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
2963 | } else if (*output->name != '\0') { | |
2964 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
2965 | session->name); | |
2966 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
2967 | } | |
6dc3064a DG |
2968 | if (!sout) { |
2969 | ret = LTTNG_ERR_INVALID; | |
2970 | goto error; | |
2971 | } | |
2972 | ||
2973 | snapshot_delete_output(&session->snapshot, sout); | |
2974 | snapshot_output_destroy(sout); | |
2975 | ret = LTTNG_OK; | |
2976 | ||
2977 | error: | |
2978 | rcu_read_unlock(); | |
2979 | return ret; | |
2980 | } | |
2981 | ||
2982 | /* | |
2983 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
2984 | * | |
2985 | * If no output is available, outputs is untouched and 0 is returned. | |
2986 | * | |
2987 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
2988 | */ | |
2989 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
2990 | struct lttng_snapshot_output **outputs) | |
2991 | { | |
2992 | int ret, idx = 0; | |
b223ca94 | 2993 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
2994 | struct lttng_ht_iter iter; |
2995 | struct snapshot_output *output; | |
2996 | ||
2997 | assert(session); | |
2998 | assert(outputs); | |
2999 | ||
3000 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3001 | ||
3002 | /* | |
d3f14b8a MD |
3003 | * Permission denied to create an output if the session is not |
3004 | * set in no output mode. | |
6dc3064a DG |
3005 | */ |
3006 | if (session->output_traces) { | |
b223ca94 | 3007 | ret = -LTTNG_ERR_EPERM; |
6dc3064a DG |
3008 | goto error; |
3009 | } | |
3010 | ||
3011 | if (session->snapshot.nb_output == 0) { | |
3012 | ret = 0; | |
3013 | goto error; | |
3014 | } | |
3015 | ||
3016 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3017 | if (!list) { | |
b223ca94 | 3018 | ret = -LTTNG_ERR_NOMEM; |
6dc3064a DG |
3019 | goto error; |
3020 | } | |
3021 | ||
3022 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3023 | rcu_read_lock(); |
6dc3064a DG |
3024 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3025 | output, node.node) { | |
3026 | assert(output->consumer); | |
3027 | list[idx].id = output->id; | |
3028 | list[idx].max_size = output->max_size; | |
3029 | strncpy(list[idx].name, output->name, sizeof(list[idx].name)); | |
3030 | if (output->consumer->type == CONSUMER_DST_LOCAL) { | |
3031 | strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path, | |
3032 | sizeof(list[idx].ctrl_url)); | |
3033 | } else { | |
3034 | /* Control URI. */ | |
3035 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3036 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3037 | if (ret < 0) { | |
b223ca94 JG |
3038 | ret = -LTTNG_ERR_NOMEM; |
3039 | goto error; | |
6dc3064a DG |
3040 | } |
3041 | ||
3042 | /* Data URI. */ | |
3043 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3044 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3045 | if (ret < 0) { | |
b223ca94 JG |
3046 | ret = -LTTNG_ERR_NOMEM; |
3047 | goto error; | |
6dc3064a DG |
3048 | } |
3049 | } | |
3050 | idx++; | |
3051 | } | |
3052 | ||
3053 | *outputs = list; | |
b223ca94 JG |
3054 | list = NULL; |
3055 | ret = session->snapshot.nb_output; | |
6dc3064a | 3056 | error: |
b223ca94 JG |
3057 | free(list); |
3058 | rcu_read_unlock(); | |
3059 | return ret; | |
6dc3064a DG |
3060 | } |
3061 | ||
3062 | /* | |
3063 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3064 | * snapshot output is *not* set with a remote destination. | |
3065 | * | |
a934f4af | 3066 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3067 | */ |
3068 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3069 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3070 | { | |
a934f4af | 3071 | int ret = LTTNG_OK; |
6dc3064a DG |
3072 | struct lttng_ht_iter iter; |
3073 | struct consumer_socket *socket; | |
3074 | ||
3075 | assert(consumer); | |
3076 | assert(snap_output); | |
3077 | assert(session); | |
3078 | ||
3079 | DBG2("Set relayd object from snapshot output"); | |
3080 | ||
3081 | /* Ignore if snapshot consumer output is not network. */ | |
3082 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3083 | goto error; | |
3084 | } | |
3085 | ||
3086 | /* | |
3087 | * For each consumer socket, create and send the relayd object of the | |
3088 | * snapshot output. | |
3089 | */ | |
3090 | rcu_read_lock(); | |
5eecee74 DG |
3091 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3092 | socket, node.node) { | |
6dc3064a | 3093 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3094 | snap_output->consumer, socket, |
3095 | session->name, session->hostname, | |
3096 | session->live_timer); | |
a934f4af | 3097 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3098 | rcu_read_unlock(); |
3099 | goto error; | |
3100 | } | |
3101 | } | |
3102 | rcu_read_unlock(); | |
3103 | ||
3104 | error: | |
3105 | return ret; | |
3106 | } | |
3107 | ||
3108 | /* | |
3109 | * Record a kernel snapshot. | |
3110 | * | |
fac41e72 | 3111 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3112 | */ |
3113 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3114 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3115 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3116 | { |
3117 | int ret; | |
3118 | ||
3119 | assert(ksess); | |
3120 | assert(output); | |
3121 | assert(session); | |
3122 | ||
10a50311 JD |
3123 | /* Get the datetime for the snapshot output directory. */ |
3124 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime, | |
3125 | sizeof(output->datetime)); | |
3126 | if (!ret) { | |
a934f4af | 3127 | ret = LTTNG_ERR_INVALID; |
10a50311 JD |
3128 | goto error; |
3129 | } | |
3130 | ||
af706bb7 DG |
3131 | /* |
3132 | * Copy kernel session sockets so we can communicate with the right | |
3133 | * consumer for the snapshot record command. | |
3134 | */ | |
3135 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3136 | if (ret < 0) { | |
a934f4af | 3137 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3138 | goto error; |
6dc3064a DG |
3139 | } |
3140 | ||
3141 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3142 | if (ret != LTTNG_OK) { |
af706bb7 | 3143 | goto error_snapshot; |
6dc3064a DG |
3144 | } |
3145 | ||
d07ceecd | 3146 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3147 | if (ret != LTTNG_OK) { |
af706bb7 | 3148 | goto error_snapshot; |
6dc3064a DG |
3149 | } |
3150 | ||
a934f4af | 3151 | ret = LTTNG_OK; |
1371fc12 | 3152 | goto end; |
a934f4af | 3153 | |
af706bb7 DG |
3154 | error_snapshot: |
3155 | /* Clean up copied sockets so this output can use some other later on. */ | |
3156 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3157 | error: |
1371fc12 | 3158 | end: |
6dc3064a DG |
3159 | return ret; |
3160 | } | |
3161 | ||
3162 | /* | |
3163 | * Record a UST snapshot. | |
3164 | * | |
a934f4af | 3165 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3166 | */ |
3167 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3168 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3169 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3170 | { |
3171 | int ret; | |
3172 | ||
3173 | assert(usess); | |
3174 | assert(output); | |
3175 | assert(session); | |
3176 | ||
10a50311 JD |
3177 | /* Get the datetime for the snapshot output directory. */ |
3178 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime, | |
3179 | sizeof(output->datetime)); | |
3180 | if (!ret) { | |
a934f4af | 3181 | ret = LTTNG_ERR_INVALID; |
10a50311 JD |
3182 | goto error; |
3183 | } | |
3184 | ||
af706bb7 | 3185 | /* |
d3f14b8a | 3186 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3187 | * consumer for the snapshot record command. |
3188 | */ | |
3189 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3190 | if (ret < 0) { | |
a934f4af | 3191 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3192 | goto error; |
6dc3064a DG |
3193 | } |
3194 | ||
3195 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3196 | if (ret != LTTNG_OK) { |
af706bb7 | 3197 | goto error_snapshot; |
6dc3064a DG |
3198 | } |
3199 | ||
d07ceecd | 3200 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3201 | if (ret < 0) { |
7badf927 DG |
3202 | switch (-ret) { |
3203 | case EINVAL: | |
a934f4af | 3204 | ret = LTTNG_ERR_INVALID; |
7badf927 DG |
3205 | break; |
3206 | case ENODATA: | |
3207 | ret = LTTNG_ERR_SNAPSHOT_NODATA; | |
3208 | break; | |
3209 | default: | |
3210 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3211 | break; | |
5c786ded | 3212 | } |
af706bb7 | 3213 | goto error_snapshot; |
6dc3064a DG |
3214 | } |
3215 | ||
a934f4af DG |
3216 | ret = LTTNG_OK; |
3217 | ||
af706bb7 DG |
3218 | error_snapshot: |
3219 | /* Clean up copied sockets so this output can use some other later on. */ | |
3220 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3221 | error: |
3222 | return ret; | |
3223 | } | |
3224 | ||
d07ceecd MD |
3225 | static |
3226 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3227 | uint64_t cur_nr_packets) | |
68808f4e | 3228 | { |
d07ceecd | 3229 | uint64_t tot_size = 0; |
68808f4e DG |
3230 | |
3231 | if (session->kernel_session) { | |
3232 | struct ltt_kernel_channel *chan; | |
3233 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3234 | ||
68808f4e | 3235 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3236 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3237 | /* | |
3238 | * Don't take channel into account if we | |
3239 | * already grab all its packets. | |
3240 | */ | |
3241 | continue; | |
68808f4e | 3242 | } |
d07ceecd MD |
3243 | tot_size += chan->channel->attr.subbuf_size |
3244 | * chan->stream_count; | |
68808f4e DG |
3245 | } |
3246 | } | |
3247 | ||
3248 | if (session->ust_session) { | |
68808f4e DG |
3249 | struct ltt_ust_session *usess = session->ust_session; |
3250 | ||
d07ceecd MD |
3251 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3252 | cur_nr_packets); | |
68808f4e DG |
3253 | } |
3254 | ||
d07ceecd | 3255 | return tot_size; |
68808f4e DG |
3256 | } |
3257 | ||
5c786ded | 3258 | /* |
d07ceecd MD |
3259 | * Calculate the number of packets we can grab from each stream that |
3260 | * fits within the overall snapshot max size. | |
3261 | * | |
3262 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3263 | * the number of packets per stream. | |
3264 | * | |
3265 | * TODO: this approach is not perfect: we consider the worse case | |
3266 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3267 | * better if we do this calculation while we actually grab the packet | |
3268 | * content: we would know how much padding we don't actually store into | |
3269 | * the file. | |
3270 | * | |
3271 | * This algorithm is currently bounded by the number of packets per | |
3272 | * stream. | |
3273 | * | |
3274 | * Since we call this algorithm before actually grabbing the data, it's | |
3275 | * an approximation: for instance, applications could appear/disappear | |
3276 | * in between this call and actually grabbing data. | |
5c786ded | 3277 | */ |
d07ceecd MD |
3278 | static |
3279 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3280 | { |
d07ceecd MD |
3281 | int64_t size_left; |
3282 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3283 | |
d07ceecd MD |
3284 | if (!max_size) { |
3285 | return 0; /* Infinite */ | |
5c786ded JD |
3286 | } |
3287 | ||
d07ceecd MD |
3288 | size_left = max_size; |
3289 | for (;;) { | |
3290 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3291 | |
d07ceecd MD |
3292 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3293 | cur_nb_packets); | |
3294 | if (!one_more_packet_tot_size) { | |
3295 | /* We are already grabbing all packets. */ | |
3296 | break; | |
3297 | } | |
3298 | size_left -= one_more_packet_tot_size; | |
3299 | if (size_left < 0) { | |
3300 | break; | |
3301 | } | |
3302 | cur_nb_packets++; | |
5c786ded | 3303 | } |
d07ceecd MD |
3304 | if (!cur_nb_packets) { |
3305 | /* Not enough room to grab one packet of each stream, error. */ | |
3306 | return -1; | |
3307 | } | |
3308 | return cur_nb_packets; | |
5c786ded JD |
3309 | } |
3310 | ||
6dc3064a DG |
3311 | /* |
3312 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3313 | * | |
3314 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3315 | * complete before returning. | |
3316 | * | |
3317 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3318 | */ | |
3319 | int cmd_snapshot_record(struct ltt_session *session, | |
3320 | struct lttng_snapshot_output *output, int wait) | |
3321 | { | |
3322 | int ret = LTTNG_OK; | |
e1986656 DG |
3323 | unsigned int use_tmp_output = 0; |
3324 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3325 | unsigned int snapshot_success = 0; |
6dc3064a DG |
3326 | |
3327 | assert(session); | |
ba45d9f0 | 3328 | assert(output); |
6dc3064a DG |
3329 | |
3330 | DBG("Cmd snapshot record for session %s", session->name); | |
3331 | ||
3332 | /* | |
d3f14b8a MD |
3333 | * Permission denied to create an output if the session is not |
3334 | * set in no output mode. | |
6dc3064a DG |
3335 | */ |
3336 | if (session->output_traces) { | |
3337 | ret = LTTNG_ERR_EPERM; | |
3338 | goto error; | |
3339 | } | |
3340 | ||
3341 | /* The session needs to be started at least once. */ | |
8382cf6f | 3342 | if (!session->has_been_started) { |
6dc3064a DG |
3343 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3344 | goto error; | |
3345 | } | |
3346 | ||
3347 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3348 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3349 | ret = snapshot_output_init(output->max_size, output->name, |
3350 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3351 | &tmp_output, NULL); |
6dc3064a DG |
3352 | if (ret < 0) { |
3353 | if (ret == -ENOMEM) { | |
3354 | ret = LTTNG_ERR_NOMEM; | |
3355 | } else { | |
3356 | ret = LTTNG_ERR_INVALID; | |
3357 | } | |
3358 | goto error; | |
3359 | } | |
1bfe7328 DG |
3360 | /* Use the global session count for the temporary snapshot. */ |
3361 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
e1986656 | 3362 | use_tmp_output = 1; |
6dc3064a DG |
3363 | } |
3364 | ||
3365 | if (session->kernel_session) { | |
3366 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3367 | ||
e1986656 | 3368 | if (use_tmp_output) { |
d07ceecd MD |
3369 | int64_t nb_packets_per_stream; |
3370 | ||
3371 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3372 | tmp_output.max_size); | |
3373 | if (nb_packets_per_stream < 0) { | |
3374 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3375 | goto error; | |
3376 | } | |
e1986656 | 3377 | ret = record_kernel_snapshot(ksess, &tmp_output, session, |
d07ceecd | 3378 | wait, nb_packets_per_stream); |
a934f4af | 3379 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3380 | goto error; |
3381 | } | |
1bfe7328 | 3382 | snapshot_success = 1; |
6dc3064a DG |
3383 | } else { |
3384 | struct snapshot_output *sout; | |
3385 | struct lttng_ht_iter iter; | |
3386 | ||
3387 | rcu_read_lock(); | |
3388 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3389 | &iter.iter, sout, node.node) { | |
d07ceecd MD |
3390 | int64_t nb_packets_per_stream; |
3391 | ||
e1986656 DG |
3392 | /* |
3393 | * Make a local copy of the output and assign the possible | |
3394 | * temporary value given by the caller. | |
3395 | */ | |
3396 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3397 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
3398 | ||
e1986656 DG |
3399 | if (output->max_size != (uint64_t) -1ULL) { |
3400 | tmp_output.max_size = output->max_size; | |
3401 | } | |
3402 | ||
d07ceecd MD |
3403 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3404 | tmp_output.max_size); | |
3405 | if (nb_packets_per_stream < 0) { | |
68808f4e DG |
3406 | ret = LTTNG_ERR_MAX_SIZE_INVALID; |
3407 | goto error; | |
3408 | } | |
3409 | ||
e1986656 DG |
3410 | /* Use temporary name. */ |
3411 | if (*output->name != '\0') { | |
3412 | strncpy(tmp_output.name, output->name, | |
3413 | sizeof(tmp_output.name)); | |
3414 | } | |
3415 | ||
1bfe7328 DG |
3416 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
3417 | ||
e1986656 | 3418 | ret = record_kernel_snapshot(ksess, &tmp_output, |
d07ceecd | 3419 | session, wait, nb_packets_per_stream); |
a934f4af | 3420 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3421 | rcu_read_unlock(); |
3422 | goto error; | |
3423 | } | |
1bfe7328 | 3424 | snapshot_success = 1; |
6dc3064a DG |
3425 | } |
3426 | rcu_read_unlock(); | |
3427 | } | |
3428 | } | |
3429 | ||
3430 | if (session->ust_session) { | |
3431 | struct ltt_ust_session *usess = session->ust_session; | |
3432 | ||
e1986656 | 3433 | if (use_tmp_output) { |
d07ceecd MD |
3434 | int64_t nb_packets_per_stream; |
3435 | ||
3436 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3437 | tmp_output.max_size); | |
3438 | if (nb_packets_per_stream < 0) { | |
3439 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3440 | goto error; | |
3441 | } | |
e1986656 | 3442 | ret = record_ust_snapshot(usess, &tmp_output, session, |
d07ceecd | 3443 | wait, nb_packets_per_stream); |
a934f4af | 3444 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3445 | goto error; |
3446 | } | |
1bfe7328 | 3447 | snapshot_success = 1; |
6dc3064a DG |
3448 | } else { |
3449 | struct snapshot_output *sout; | |
3450 | struct lttng_ht_iter iter; | |
3451 | ||
3452 | rcu_read_lock(); | |
3453 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3454 | &iter.iter, sout, node.node) { | |
d07ceecd MD |
3455 | int64_t nb_packets_per_stream; |
3456 | ||
e1986656 DG |
3457 | /* |
3458 | * Make a local copy of the output and assign the possible | |
3459 | * temporary value given by the caller. | |
3460 | */ | |
3461 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3462 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
3463 | ||
e1986656 DG |
3464 | if (output->max_size != (uint64_t) -1ULL) { |
3465 | tmp_output.max_size = output->max_size; | |
3466 | } | |
3467 | ||
d07ceecd MD |
3468 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3469 | tmp_output.max_size); | |
3470 | if (nb_packets_per_stream < 0) { | |
68808f4e | 3471 | ret = LTTNG_ERR_MAX_SIZE_INVALID; |
d07ceecd | 3472 | rcu_read_unlock(); |
68808f4e DG |
3473 | goto error; |
3474 | } | |
3475 | ||
e1986656 DG |
3476 | /* Use temporary name. */ |
3477 | if (*output->name != '\0') { | |
3478 | strncpy(tmp_output.name, output->name, | |
3479 | sizeof(tmp_output.name)); | |
3480 | } | |
3481 | ||
1bfe7328 DG |
3482 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
3483 | ||
e1986656 | 3484 | ret = record_ust_snapshot(usess, &tmp_output, session, |
d07ceecd | 3485 | wait, nb_packets_per_stream); |
a934f4af | 3486 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3487 | rcu_read_unlock(); |
3488 | goto error; | |
3489 | } | |
1bfe7328 | 3490 | snapshot_success = 1; |
6dc3064a DG |
3491 | } |
3492 | rcu_read_unlock(); | |
3493 | } | |
3494 | } | |
3495 | ||
1bfe7328 DG |
3496 | if (snapshot_success) { |
3497 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
3498 | } else { |
3499 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
3500 | } |
3501 | ||
6dc3064a | 3502 | error: |
6dc3064a DG |
3503 | return ret; |
3504 | } | |
3505 | ||
d7ba1388 MD |
3506 | /* |
3507 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
3508 | */ | |
3509 | int cmd_set_session_shm_path(struct ltt_session *session, | |
3510 | const char *shm_path) | |
3511 | { | |
3512 | /* Safety net */ | |
3513 | assert(session); | |
3514 | ||
3515 | /* | |
3516 | * Can only set shm path before session is started. | |
3517 | */ | |
3518 | if (session->has_been_started) { | |
3519 | return LTTNG_ERR_SESSION_STARTED; | |
3520 | } | |
3521 | ||
3522 | strncpy(session->shm_path, shm_path, | |
3523 | sizeof(session->shm_path)); | |
3524 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
3525 | ||
3526 | return 0; | |
3527 | } | |
3528 | ||
2f77fc4b DG |
3529 | /* |
3530 | * Init command subsystem. | |
3531 | */ | |
3532 | void cmd_init(void) | |
3533 | { | |
3534 | /* | |
d88aee68 DG |
3535 | * Set network sequence index to 1 for streams to match a relayd |
3536 | * socket on the consumer side. | |
2f77fc4b | 3537 | */ |
d88aee68 DG |
3538 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
3539 | relayd_net_seq_idx = 1; | |
3540 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
3541 | |
3542 | DBG("Command subsystem initialized"); | |
3543 | } |