Commit | Line | Data |
---|---|---|
2f77fc4b DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
2f77fc4b DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License, version 2 only, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
16 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
2f77fc4b | 20 | #include <assert.h> |
6dc3064a | 21 | #include <inttypes.h> |
2f77fc4b DG |
22 | #include <urcu/list.h> |
23 | #include <urcu/uatomic.h> | |
24 | ||
25 | #include <common/defaults.h> | |
26 | #include <common/common.h> | |
27 | #include <common/sessiond-comm/sessiond-comm.h> | |
28 | #include <common/relayd/relayd.h> | |
10a50311 | 29 | #include <common/utils.h> |
f5436bfc | 30 | #include <common/compat/string.h> |
2f77fc4b DG |
31 | |
32 | #include "channel.h" | |
33 | #include "consumer.h" | |
34 | #include "event.h" | |
8782cc74 | 35 | #include "health-sessiond.h" |
2f77fc4b DG |
36 | #include "kernel.h" |
37 | #include "kernel-consumer.h" | |
38 | #include "lttng-sessiond.h" | |
39 | #include "utils.h" | |
834978fd | 40 | #include "syscall.h" |
7c1d2758 | 41 | #include "agent.h" |
2f77fc4b DG |
42 | |
43 | #include "cmd.h" | |
44 | ||
45 | /* | |
46 | * Used to keep a unique index for each relayd socket created where this value | |
47 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
48 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
49 | * held. | |
2f77fc4b | 50 | */ |
d88aee68 DG |
51 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
52 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 53 | |
7076b56e JG |
54 | static int validate_event_name(const char *); |
55 | static int validate_ust_event_name(const char *); | |
56 | static int cmd_enable_event_internal(struct ltt_session *session, | |
57 | struct lttng_domain *domain, | |
58 | char *channel_name, struct lttng_event *event, | |
59 | char *filter_expression, | |
60 | struct lttng_filter_bytecode *filter, | |
61 | struct lttng_event_exclusion *exclusion, | |
62 | int wpipe); | |
63 | ||
2f77fc4b DG |
64 | /* |
65 | * Create a session path used by list_lttng_sessions for the case that the | |
66 | * session consumer is on the network. | |
67 | */ | |
68 | static int build_network_session_path(char *dst, size_t size, | |
69 | struct ltt_session *session) | |
70 | { | |
71 | int ret, kdata_port, udata_port; | |
72 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
73 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
74 | ||
75 | assert(session); | |
76 | assert(dst); | |
77 | ||
78 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
79 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
80 | ||
81 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
82 | ||
83 | if (session->kernel_session && session->kernel_session->consumer) { | |
84 | kuri = &session->kernel_session->consumer->dst.net.control; | |
85 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
86 | } | |
87 | ||
88 | if (session->ust_session && session->ust_session->consumer) { | |
89 | uuri = &session->ust_session->consumer->dst.net.control; | |
90 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
91 | } | |
92 | ||
93 | if (uuri == NULL && kuri == NULL) { | |
94 | uri = &session->consumer->dst.net.control; | |
95 | kdata_port = session->consumer->dst.net.data.port; | |
96 | } else if (kuri && uuri) { | |
97 | ret = uri_compare(kuri, uuri); | |
98 | if (ret) { | |
99 | /* Not Equal */ | |
100 | uri = kuri; | |
101 | /* Build uuri URL string */ | |
102 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
103 | if (ret < 0) { | |
104 | goto error; | |
105 | } | |
106 | } else { | |
107 | uri = kuri; | |
108 | } | |
109 | } else if (kuri && uuri == NULL) { | |
110 | uri = kuri; | |
111 | } else if (uuri && kuri == NULL) { | |
112 | uri = uuri; | |
113 | } | |
114 | ||
115 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
116 | if (ret < 0) { | |
117 | goto error; | |
118 | } | |
119 | ||
9aa9f900 DG |
120 | /* |
121 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
122 | * to print. | |
123 | */ | |
9d035200 | 124 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
125 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
126 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
127 | } else { | |
9aa9f900 | 128 | int dport; |
bef08707 | 129 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
130 | dport = kdata_port; |
131 | } else { | |
132 | /* No kernel URI, use the UST port. */ | |
133 | dport = udata_port; | |
134 | } | |
135 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
136 | } |
137 | ||
138 | error: | |
139 | return ret; | |
140 | } | |
141 | ||
142 | /* | |
143 | * Fill lttng_channel array of all channels. | |
144 | */ | |
56a37563 JG |
145 | static void list_lttng_channels(enum lttng_domain_type domain, |
146 | struct ltt_session *session, struct lttng_channel *channels) | |
2f77fc4b DG |
147 | { |
148 | int i = 0; | |
149 | struct ltt_kernel_channel *kchan; | |
150 | ||
151 | DBG("Listing channels for session %s", session->name); | |
152 | ||
153 | switch (domain) { | |
154 | case LTTNG_DOMAIN_KERNEL: | |
155 | /* Kernel channels */ | |
156 | if (session->kernel_session != NULL) { | |
157 | cds_list_for_each_entry(kchan, | |
158 | &session->kernel_session->channel_list.head, list) { | |
159 | /* Copy lttng_channel struct to array */ | |
160 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
161 | channels[i].enabled = kchan->enabled; | |
162 | i++; | |
163 | } | |
164 | } | |
165 | break; | |
166 | case LTTNG_DOMAIN_UST: | |
167 | { | |
168 | struct lttng_ht_iter iter; | |
169 | struct ltt_ust_channel *uchan; | |
170 | ||
e7fe706f | 171 | rcu_read_lock(); |
2f77fc4b DG |
172 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
173 | &iter.iter, uchan, node.node) { | |
174 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
175 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
176 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
177 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
178 | channels[i].attr.switch_timer_interval = | |
179 | uchan->attr.switch_timer_interval; | |
180 | channels[i].attr.read_timer_interval = | |
181 | uchan->attr.read_timer_interval; | |
182 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
183 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
184 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
2f77fc4b DG |
185 | switch (uchan->attr.output) { |
186 | case LTTNG_UST_MMAP: | |
187 | default: | |
188 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
189 | break; | |
190 | } | |
191 | i++; | |
192 | } | |
e7fe706f | 193 | rcu_read_unlock(); |
2f77fc4b DG |
194 | break; |
195 | } | |
196 | default: | |
197 | break; | |
198 | } | |
199 | } | |
200 | ||
b4e3ceb9 PP |
201 | static void increment_extended_len(const char *filter_expression, |
202 | size_t *extended_len) | |
203 | { | |
204 | *extended_len += sizeof(struct lttcomm_event_extended_header); | |
205 | ||
206 | if (filter_expression) { | |
207 | *extended_len += strlen(filter_expression) + 1; | |
208 | } | |
209 | } | |
210 | ||
211 | static void append_extended_info(const char *filter_expression, | |
212 | void **extended_at) | |
213 | { | |
214 | struct lttcomm_event_extended_header extended_header; | |
215 | size_t filter_len = 0; | |
216 | ||
217 | if (filter_expression) { | |
218 | filter_len = strlen(filter_expression) + 1; | |
219 | } | |
220 | ||
221 | extended_header.filter_len = filter_len; | |
222 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); | |
223 | *extended_at += sizeof(extended_header); | |
224 | memcpy(*extended_at, filter_expression, filter_len); | |
225 | *extended_at += filter_len; | |
226 | } | |
227 | ||
3c6a091f | 228 | /* |
022d91ba | 229 | * Create a list of agent domain events. |
3c6a091f DG |
230 | * |
231 | * Return number of events in list on success or else a negative value. | |
232 | */ | |
022d91ba | 233 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 234 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
235 | { |
236 | int i = 0, ret = 0; | |
237 | unsigned int nb_event = 0; | |
022d91ba | 238 | struct agent_event *event; |
3c6a091f DG |
239 | struct lttng_event *tmp_events; |
240 | struct lttng_ht_iter iter; | |
b4e3ceb9 PP |
241 | size_t extended_len = 0; |
242 | void *extended_at; | |
3c6a091f | 243 | |
022d91ba | 244 | assert(agt); |
3c6a091f DG |
245 | assert(events); |
246 | ||
022d91ba | 247 | DBG3("Listing agent events"); |
3c6a091f | 248 | |
e5bbf678 | 249 | rcu_read_lock(); |
022d91ba | 250 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 251 | rcu_read_unlock(); |
3c6a091f DG |
252 | if (nb_event == 0) { |
253 | ret = nb_event; | |
b4e3ceb9 | 254 | *total_size = 0; |
3c6a091f DG |
255 | goto error; |
256 | } | |
257 | ||
b4e3ceb9 PP |
258 | /* Compute required extended infos size */ |
259 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
260 | ||
261 | /* | |
262 | * This is only valid because the commands which add events are | |
263 | * processed in the same thread as the listing. | |
264 | */ | |
265 | rcu_read_lock(); | |
266 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
267 | increment_extended_len(event->filter_expression, &extended_len); | |
268 | } | |
269 | rcu_read_unlock(); | |
270 | ||
271 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
272 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 273 | if (!tmp_events) { |
022d91ba | 274 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
275 | ret = -LTTNG_ERR_FATAL; |
276 | goto error; | |
277 | } | |
278 | ||
b4e3ceb9 PP |
279 | extended_at = ((uint8_t *) tmp_events) + |
280 | nb_event * sizeof(struct lttng_event); | |
281 | ||
3c6a091f | 282 | rcu_read_lock(); |
022d91ba | 283 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
284 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
285 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
286 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 287 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 288 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 289 | i++; |
b4e3ceb9 PP |
290 | |
291 | /* Append extended info */ | |
292 | append_extended_info(event->filter_expression, &extended_at); | |
3c6a091f DG |
293 | } |
294 | rcu_read_unlock(); | |
295 | ||
296 | *events = tmp_events; | |
297 | ret = nb_event; | |
298 | ||
299 | error: | |
300 | assert(nb_event == i); | |
301 | return ret; | |
302 | } | |
303 | ||
2f77fc4b DG |
304 | /* |
305 | * Create a list of ust global domain events. | |
306 | */ | |
307 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
308 | struct ltt_ust_domain_global *ust_global, |
309 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
310 | { |
311 | int i = 0, ret = 0; | |
312 | unsigned int nb_event = 0; | |
313 | struct lttng_ht_iter iter; | |
314 | struct lttng_ht_node_str *node; | |
315 | struct ltt_ust_channel *uchan; | |
316 | struct ltt_ust_event *uevent; | |
317 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
318 | size_t extended_len = 0; |
319 | void *extended_at; | |
2f77fc4b DG |
320 | |
321 | DBG("Listing UST global events for channel %s", channel_name); | |
322 | ||
323 | rcu_read_lock(); | |
324 | ||
325 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
326 | node = lttng_ht_iter_get_node_str(&iter); | |
327 | if (node == NULL) { | |
f73fabfd | 328 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
329 | goto error; |
330 | } | |
331 | ||
332 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
333 | ||
3c442be3 | 334 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
335 | if (nb_event == 0) { |
336 | ret = nb_event; | |
b4e3ceb9 | 337 | *total_size = 0; |
2f77fc4b DG |
338 | goto error; |
339 | } | |
340 | ||
341 | DBG3("Listing UST global %d events", nb_event); | |
342 | ||
b4e3ceb9 PP |
343 | /* Compute required extended infos size */ |
344 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
345 | if (uevent->internal) { | |
346 | nb_event--; | |
347 | continue; | |
348 | } | |
349 | ||
350 | increment_extended_len(uevent->filter_expression, | |
351 | &extended_len); | |
352 | } | |
353 | ||
354 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
355 | tmp = zmalloc(*total_size); | |
2f77fc4b | 356 | if (tmp == NULL) { |
f73fabfd | 357 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
358 | goto error; |
359 | } | |
360 | ||
b4e3ceb9 PP |
361 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
362 | ||
2f77fc4b | 363 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
364 | if (uevent->internal) { |
365 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
366 | continue; |
367 | } | |
2f77fc4b DG |
368 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
369 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
370 | tmp[i].enabled = uevent->enabled; | |
371 | ||
372 | switch (uevent->attr.instrumentation) { | |
373 | case LTTNG_UST_TRACEPOINT: | |
374 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
375 | break; | |
376 | case LTTNG_UST_PROBE: | |
377 | tmp[i].type = LTTNG_EVENT_PROBE; | |
378 | break; | |
379 | case LTTNG_UST_FUNCTION: | |
380 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
381 | break; | |
382 | } | |
383 | ||
384 | tmp[i].loglevel = uevent->attr.loglevel; | |
385 | switch (uevent->attr.loglevel_type) { | |
386 | case LTTNG_UST_LOGLEVEL_ALL: | |
387 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
388 | break; | |
389 | case LTTNG_UST_LOGLEVEL_RANGE: | |
390 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
391 | break; | |
392 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
393 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
394 | break; | |
395 | } | |
396 | if (uevent->filter) { | |
397 | tmp[i].filter = 1; | |
398 | } | |
4634f12e JI |
399 | if (uevent->exclusion) { |
400 | tmp[i].exclusion = 1; | |
401 | } | |
2f77fc4b | 402 | i++; |
b4e3ceb9 PP |
403 | |
404 | /* Append extended info */ | |
405 | append_extended_info(uevent->filter_expression, &extended_at); | |
2f77fc4b DG |
406 | } |
407 | ||
408 | ret = nb_event; | |
409 | *events = tmp; | |
410 | ||
411 | error: | |
412 | rcu_read_unlock(); | |
413 | return ret; | |
414 | } | |
415 | ||
416 | /* | |
417 | * Fill lttng_event array of all kernel events in the channel. | |
418 | */ | |
419 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
420 | struct ltt_kernel_session *kernel_session, |
421 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
422 | { |
423 | int i = 0, ret; | |
424 | unsigned int nb_event; | |
425 | struct ltt_kernel_event *event; | |
426 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
427 | size_t extended_len = 0; |
428 | void *extended_at; | |
2f77fc4b DG |
429 | |
430 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
431 | if (kchan == NULL) { | |
f73fabfd | 432 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
433 | goto error; |
434 | } | |
435 | ||
436 | nb_event = kchan->event_count; | |
437 | ||
438 | DBG("Listing events for channel %s", kchan->channel->name); | |
439 | ||
440 | if (nb_event == 0) { | |
b4e3ceb9 | 441 | *total_size = 0; |
834978fd DG |
442 | *events = NULL; |
443 | goto syscall; | |
2f77fc4b DG |
444 | } |
445 | ||
b4e3ceb9 PP |
446 | /* Compute required extended infos size */ |
447 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
448 | increment_extended_len(event->filter_expression, &extended_len); | |
449 | } | |
450 | ||
451 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
452 | *events = zmalloc(*total_size); | |
2f77fc4b | 453 | if (*events == NULL) { |
f73fabfd | 454 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
455 | goto error; |
456 | } | |
457 | ||
b4e3ceb9 PP |
458 | extended_at = ((uint8_t *) events) + |
459 | nb_event * sizeof(struct lttng_event); | |
460 | ||
2f77fc4b DG |
461 | /* Kernel channels */ |
462 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
463 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
464 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
465 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
466 | (*events)[i].filter = |
467 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
468 | |
469 | switch (event->event->instrumentation) { | |
470 | case LTTNG_KERNEL_TRACEPOINT: | |
471 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
472 | break; | |
2f77fc4b | 473 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
474 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
475 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
476 | sizeof(struct lttng_kernel_kprobe)); | |
477 | break; | |
478 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
479 | (*events)[i].type = LTTNG_EVENT_PROBE; |
480 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
481 | sizeof(struct lttng_kernel_kprobe)); | |
482 | break; | |
483 | case LTTNG_KERNEL_FUNCTION: | |
484 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
485 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
486 | sizeof(struct lttng_kernel_function)); | |
487 | break; | |
488 | case LTTNG_KERNEL_NOOP: | |
489 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
490 | break; | |
491 | case LTTNG_KERNEL_SYSCALL: | |
492 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
493 | break; | |
494 | case LTTNG_KERNEL_ALL: | |
495 | assert(0); | |
496 | break; | |
497 | } | |
498 | i++; | |
b4e3ceb9 PP |
499 | |
500 | /* Append extended info */ | |
501 | append_extended_info(event->filter_expression, &extended_at); | |
2f77fc4b DG |
502 | } |
503 | ||
834978fd DG |
504 | syscall: |
505 | if (syscall_table) { | |
506 | ssize_t new_size; | |
507 | ||
508 | new_size = syscall_list_channel(kchan, events, nb_event); | |
509 | if (new_size < 0) { | |
510 | free(events); | |
511 | ret = -new_size; | |
512 | goto error; | |
513 | } | |
514 | nb_event = new_size; | |
515 | } | |
516 | ||
2f77fc4b DG |
517 | return nb_event; |
518 | ||
519 | error: | |
f73fabfd DG |
520 | /* Negate the error code to differentiate the size from an error */ |
521 | return -ret; | |
2f77fc4b DG |
522 | } |
523 | ||
524 | /* | |
525 | * Add URI so the consumer output object. Set the correct path depending on the | |
526 | * domain adding the default trace directory. | |
527 | */ | |
528 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
56a37563 JG |
529 | struct lttng_uri *uri, enum lttng_domain_type domain, |
530 | const char *session_name) | |
2f77fc4b | 531 | { |
f73fabfd | 532 | int ret = LTTNG_OK; |
2f77fc4b DG |
533 | const char *default_trace_dir; |
534 | ||
535 | assert(uri); | |
536 | ||
537 | if (consumer == NULL) { | |
538 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 539 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
540 | goto error; |
541 | } | |
542 | ||
543 | switch (domain) { | |
544 | case LTTNG_DOMAIN_KERNEL: | |
545 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
546 | break; | |
547 | case LTTNG_DOMAIN_UST: | |
548 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
549 | break; | |
550 | default: | |
551 | /* | |
552 | * This case is possible is we try to add the URI to the global tracing | |
553 | * session consumer object which in this case there is no subdir. | |
554 | */ | |
555 | default_trace_dir = ""; | |
556 | } | |
557 | ||
558 | switch (uri->dtype) { | |
559 | case LTTNG_DST_IPV4: | |
560 | case LTTNG_DST_IPV6: | |
561 | DBG2("Setting network URI to consumer"); | |
562 | ||
df75acac DG |
563 | if (consumer->type == CONSUMER_DST_NET) { |
564 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
565 | consumer->dst.net.control_isset) || |
566 | (uri->stype == LTTNG_STREAM_DATA && | |
567 | consumer->dst.net.data_isset)) { | |
df75acac DG |
568 | ret = LTTNG_ERR_URL_EXIST; |
569 | goto error; | |
570 | } | |
571 | } else { | |
572 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
573 | } |
574 | ||
df75acac DG |
575 | consumer->type = CONSUMER_DST_NET; |
576 | ||
2f77fc4b DG |
577 | /* Set URI into consumer output object */ |
578 | ret = consumer_set_network_uri(consumer, uri); | |
579 | if (ret < 0) { | |
a74934ba | 580 | ret = -ret; |
2f77fc4b DG |
581 | goto error; |
582 | } else if (ret == 1) { | |
583 | /* | |
584 | * URI was the same in the consumer so we do not append the subdir | |
585 | * again so to not duplicate output dir. | |
586 | */ | |
f86c9f4e | 587 | ret = LTTNG_OK; |
2f77fc4b DG |
588 | goto error; |
589 | } | |
590 | ||
591 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
592 | ret = consumer_set_subdir(consumer, session_name); | |
593 | if (ret < 0) { | |
f73fabfd | 594 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
595 | goto error; |
596 | } | |
597 | } | |
598 | ||
599 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
600 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
601 | strncat(consumer->subdir, default_trace_dir, |
602 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
603 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
604 | } | |
605 | ||
606 | break; | |
607 | case LTTNG_DST_PATH: | |
608 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
609 | memset(consumer->dst.trace_path, 0, | |
610 | sizeof(consumer->dst.trace_path)); | |
611 | strncpy(consumer->dst.trace_path, uri->dst.path, | |
612 | sizeof(consumer->dst.trace_path)); | |
613 | /* Append default trace dir */ | |
614 | strncat(consumer->dst.trace_path, default_trace_dir, | |
c30ce0b3 CB |
615 | sizeof(consumer->dst.trace_path) - |
616 | strlen(consumer->dst.trace_path) - 1); | |
2f77fc4b DG |
617 | /* Flag consumer as local. */ |
618 | consumer->type = CONSUMER_DST_LOCAL; | |
619 | break; | |
620 | } | |
621 | ||
a74934ba DG |
622 | ret = LTTNG_OK; |
623 | ||
2f77fc4b DG |
624 | error: |
625 | return ret; | |
626 | } | |
627 | ||
628 | /* | |
629 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
630 | */ | |
631 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
632 | { | |
633 | int ret = 0; | |
634 | struct lttng_ht_iter iter; | |
635 | struct consumer_socket *socket; | |
636 | ||
637 | assert(session); | |
638 | ||
e7fe706f DG |
639 | rcu_read_lock(); |
640 | ||
2f77fc4b DG |
641 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
642 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
643 | socket, node.node) { | |
2f77fc4b | 644 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 645 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
646 | pthread_mutex_unlock(socket->lock); |
647 | if (ret < 0) { | |
f73fabfd | 648 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
649 | goto error; |
650 | } | |
651 | } | |
652 | } | |
653 | ||
654 | error: | |
e7fe706f | 655 | rcu_read_unlock(); |
2f77fc4b DG |
656 | return ret; |
657 | } | |
658 | ||
659 | /* | |
660 | * Create a socket to the relayd using the URI. | |
661 | * | |
662 | * On success, the relayd_sock pointer is set to the created socket. | |
663 | * Else, it's stays untouched and a lttcomm error code is returned. | |
664 | */ | |
6151a90f JD |
665 | static int create_connect_relayd(struct lttng_uri *uri, |
666 | struct lttcomm_relayd_sock **relayd_sock) | |
2f77fc4b DG |
667 | { |
668 | int ret; | |
6151a90f | 669 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 670 | |
6151a90f JD |
671 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
672 | RELAYD_VERSION_COMM_MINOR); | |
673 | if (!rsock) { | |
f73fabfd | 674 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
675 | goto error; |
676 | } | |
677 | ||
ffe60014 DG |
678 | /* |
679 | * Connect to relayd so we can proceed with a session creation. This call | |
680 | * can possibly block for an arbitrary amount of time to set the health | |
681 | * state to be in poll execution. | |
682 | */ | |
683 | health_poll_entry(); | |
6151a90f | 684 | ret = relayd_connect(rsock); |
ffe60014 | 685 | health_poll_exit(); |
2f77fc4b DG |
686 | if (ret < 0) { |
687 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 688 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
689 | goto free_sock; |
690 | } | |
691 | ||
692 | /* Create socket for control stream. */ | |
693 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
694 | DBG3("Creating relayd stream socket from URI"); | |
695 | ||
696 | /* Check relayd version */ | |
6151a90f | 697 | ret = relayd_version_check(rsock); |
2f77fc4b | 698 | if (ret < 0) { |
f73fabfd | 699 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
700 | goto close_sock; |
701 | } | |
702 | } else if (uri->stype == LTTNG_STREAM_DATA) { | |
703 | DBG3("Creating relayd data socket from URI"); | |
704 | } else { | |
705 | /* Command is not valid */ | |
706 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 707 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
708 | goto close_sock; |
709 | } | |
710 | ||
6151a90f | 711 | *relayd_sock = rsock; |
2f77fc4b | 712 | |
f73fabfd | 713 | return LTTNG_OK; |
2f77fc4b DG |
714 | |
715 | close_sock: | |
6151a90f JD |
716 | /* The returned value is not useful since we are on an error path. */ |
717 | (void) relayd_close(rsock); | |
2f77fc4b | 718 | free_sock: |
6151a90f | 719 | free(rsock); |
2f77fc4b DG |
720 | error: |
721 | return ret; | |
722 | } | |
723 | ||
724 | /* | |
725 | * Connect to the relayd using URI and send the socket to the right consumer. | |
726 | */ | |
56a37563 JG |
727 | static int send_consumer_relayd_socket(enum lttng_domain_type domain, |
728 | unsigned int session_id, struct lttng_uri *relayd_uri, | |
729 | struct consumer_output *consumer, | |
d3e2ba59 JD |
730 | struct consumer_socket *consumer_sock, |
731 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
732 | { |
733 | int ret; | |
6151a90f | 734 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 735 | |
ffe60014 | 736 | /* Connect to relayd and make version check if uri is the control. */ |
6151a90f | 737 | ret = create_connect_relayd(relayd_uri, &rsock); |
ffe60014 | 738 | if (ret != LTTNG_OK) { |
6151a90f | 739 | goto error; |
ffe60014 | 740 | } |
6151a90f | 741 | assert(rsock); |
ffe60014 | 742 | |
2f77fc4b | 743 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
744 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
745 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
746 | /* |
747 | * Increment net_seq_idx because we are about to transfer the | |
748 | * new relayd socket to the consumer. | |
d88aee68 | 749 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 750 | */ |
d88aee68 DG |
751 | consumer->net_seq_index = ++relayd_net_seq_idx; |
752 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
753 | } |
754 | ||
2f77fc4b | 755 | /* Send relayd socket to consumer. */ |
6151a90f | 756 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
757 | relayd_uri->stype, session_id, |
758 | session_name, hostname, session_live_timer); | |
2f77fc4b | 759 | if (ret < 0) { |
f73fabfd | 760 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
761 | goto close_sock; |
762 | } | |
763 | ||
c890b720 DG |
764 | /* Flag that the corresponding socket was sent. */ |
765 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 766 | consumer_sock->control_sock_sent = 1; |
c890b720 | 767 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 768 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
769 | } |
770 | ||
f73fabfd | 771 | ret = LTTNG_OK; |
2f77fc4b DG |
772 | |
773 | /* | |
774 | * Close socket which was dup on the consumer side. The session daemon does | |
775 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
776 | */ | |
777 | ||
778 | close_sock: | |
6151a90f JD |
779 | (void) relayd_close(rsock); |
780 | free(rsock); | |
2f77fc4b | 781 | |
6151a90f | 782 | error: |
ffe60014 DG |
783 | if (ret != LTTNG_OK) { |
784 | /* | |
d9078d0c DG |
785 | * The consumer output for this session should not be used anymore |
786 | * since the relayd connection failed thus making any tracing or/and | |
787 | * streaming not usable. | |
ffe60014 | 788 | */ |
d9078d0c | 789 | consumer->enabled = 0; |
ffe60014 | 790 | } |
2f77fc4b DG |
791 | return ret; |
792 | } | |
793 | ||
794 | /* | |
795 | * Send both relayd sockets to a specific consumer and domain. This is a | |
796 | * helper function to facilitate sending the information to the consumer for a | |
797 | * session. | |
798 | */ | |
56a37563 JG |
799 | static int send_consumer_relayd_sockets(enum lttng_domain_type domain, |
800 | unsigned int session_id, struct consumer_output *consumer, | |
801 | struct consumer_socket *sock, char *session_name, | |
802 | char *hostname, int session_live_timer) | |
2f77fc4b | 803 | { |
dda67f6c | 804 | int ret = LTTNG_OK; |
2f77fc4b | 805 | |
2f77fc4b | 806 | assert(consumer); |
6dc3064a | 807 | assert(sock); |
2f77fc4b | 808 | |
2f77fc4b | 809 | /* Sending control relayd socket. */ |
ffe60014 | 810 | if (!sock->control_sock_sent) { |
6dc3064a | 811 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
812 | &consumer->dst.net.control, consumer, sock, |
813 | session_name, hostname, session_live_timer); | |
c890b720 DG |
814 | if (ret != LTTNG_OK) { |
815 | goto error; | |
816 | } | |
2f77fc4b DG |
817 | } |
818 | ||
819 | /* Sending data relayd socket. */ | |
ffe60014 | 820 | if (!sock->data_sock_sent) { |
6dc3064a | 821 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
822 | &consumer->dst.net.data, consumer, sock, |
823 | session_name, hostname, session_live_timer); | |
c890b720 DG |
824 | if (ret != LTTNG_OK) { |
825 | goto error; | |
826 | } | |
2f77fc4b DG |
827 | } |
828 | ||
2f77fc4b DG |
829 | error: |
830 | return ret; | |
831 | } | |
832 | ||
833 | /* | |
834 | * Setup relayd connections for a tracing session. First creates the socket to | |
835 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
836 | * network. | |
837 | */ | |
ffe60014 | 838 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 839 | { |
f73fabfd | 840 | int ret = LTTNG_OK; |
2f77fc4b DG |
841 | struct ltt_ust_session *usess; |
842 | struct ltt_kernel_session *ksess; | |
843 | struct consumer_socket *socket; | |
844 | struct lttng_ht_iter iter; | |
845 | ||
846 | assert(session); | |
847 | ||
848 | usess = session->ust_session; | |
849 | ksess = session->kernel_session; | |
850 | ||
785d2d0d | 851 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 852 | |
e7fe706f DG |
853 | rcu_read_lock(); |
854 | ||
2f77fc4b DG |
855 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
856 | && usess->consumer->enabled) { | |
857 | /* For each consumer socket, send relayd sockets */ | |
858 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
859 | socket, node.node) { | |
2f77fc4b | 860 | pthread_mutex_lock(socket->lock); |
6dc3064a | 861 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
862 | usess->consumer, socket, |
863 | session->name, session->hostname, | |
864 | session->live_timer); | |
2f77fc4b | 865 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 866 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
867 | goto error; |
868 | } | |
6dc3064a DG |
869 | /* Session is now ready for network streaming. */ |
870 | session->net_handle = 1; | |
2f77fc4b DG |
871 | } |
872 | } | |
873 | ||
874 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
875 | && ksess->consumer->enabled) { | |
876 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
877 | socket, node.node) { | |
2f77fc4b | 878 | pthread_mutex_lock(socket->lock); |
6dc3064a | 879 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
880 | ksess->consumer, socket, |
881 | session->name, session->hostname, | |
882 | session->live_timer); | |
2f77fc4b | 883 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 884 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
885 | goto error; |
886 | } | |
6dc3064a DG |
887 | /* Session is now ready for network streaming. */ |
888 | session->net_handle = 1; | |
2f77fc4b DG |
889 | } |
890 | } | |
891 | ||
892 | error: | |
e7fe706f | 893 | rcu_read_unlock(); |
2f77fc4b DG |
894 | return ret; |
895 | } | |
896 | ||
9b6c7ec5 DG |
897 | /* |
898 | * Start a kernel session by opening all necessary streams. | |
899 | */ | |
900 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
901 | { | |
902 | int ret; | |
903 | struct ltt_kernel_channel *kchan; | |
904 | ||
905 | /* Open kernel metadata */ | |
07b86b52 | 906 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
907 | ret = kernel_open_metadata(ksess); |
908 | if (ret < 0) { | |
909 | ret = LTTNG_ERR_KERN_META_FAIL; | |
910 | goto error; | |
911 | } | |
912 | } | |
913 | ||
914 | /* Open kernel metadata stream */ | |
07b86b52 | 915 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
916 | ret = kernel_open_metadata_stream(ksess); |
917 | if (ret < 0) { | |
918 | ERR("Kernel create metadata stream failed"); | |
919 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
920 | goto error; | |
921 | } | |
922 | } | |
923 | ||
924 | /* For each channel */ | |
925 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
926 | if (kchan->stream_count == 0) { | |
927 | ret = kernel_open_channel_stream(kchan); | |
928 | if (ret < 0) { | |
929 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
930 | goto error; | |
931 | } | |
932 | /* Update the stream global counter */ | |
933 | ksess->stream_count_global += ret; | |
934 | } | |
935 | } | |
936 | ||
937 | /* Setup kernel consumer socket and send fds to it */ | |
938 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 939 | if (ret != 0) { |
9b6c7ec5 DG |
940 | ret = LTTNG_ERR_KERN_START_FAIL; |
941 | goto error; | |
942 | } | |
943 | ||
944 | /* This start the kernel tracing */ | |
945 | ret = kernel_start_session(ksess); | |
946 | if (ret < 0) { | |
947 | ret = LTTNG_ERR_KERN_START_FAIL; | |
948 | goto error; | |
949 | } | |
950 | ||
951 | /* Quiescent wait after starting trace */ | |
784303b0 | 952 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 | 953 | |
14fb1ebe | 954 | ksess->active = 1; |
9b6c7ec5 DG |
955 | |
956 | ret = LTTNG_OK; | |
957 | ||
958 | error: | |
959 | return ret; | |
960 | } | |
961 | ||
2f77fc4b DG |
962 | /* |
963 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
964 | */ | |
56a37563 JG |
965 | int cmd_disable_channel(struct ltt_session *session, |
966 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
967 | { |
968 | int ret; | |
969 | struct ltt_ust_session *usess; | |
970 | ||
971 | usess = session->ust_session; | |
972 | ||
2223c96f DG |
973 | rcu_read_lock(); |
974 | ||
2f77fc4b DG |
975 | switch (domain) { |
976 | case LTTNG_DOMAIN_KERNEL: | |
977 | { | |
978 | ret = channel_kernel_disable(session->kernel_session, | |
979 | channel_name); | |
f73fabfd | 980 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
981 | goto error; |
982 | } | |
983 | ||
984 | kernel_wait_quiescent(kernel_tracer_fd); | |
985 | break; | |
986 | } | |
987 | case LTTNG_DOMAIN_UST: | |
988 | { | |
989 | struct ltt_ust_channel *uchan; | |
990 | struct lttng_ht *chan_ht; | |
991 | ||
992 | chan_ht = usess->domain_global.channels; | |
993 | ||
994 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
995 | if (uchan == NULL) { | |
f73fabfd | 996 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
997 | goto error; |
998 | } | |
999 | ||
7972aab2 | 1000 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1001 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1002 | goto error; |
1003 | } | |
1004 | break; | |
1005 | } | |
2f77fc4b | 1006 | default: |
f73fabfd | 1007 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1008 | goto error; |
1009 | } | |
1010 | ||
f73fabfd | 1011 | ret = LTTNG_OK; |
2f77fc4b DG |
1012 | |
1013 | error: | |
2223c96f | 1014 | rcu_read_unlock(); |
2f77fc4b DG |
1015 | return ret; |
1016 | } | |
1017 | ||
ccf10263 MD |
1018 | /* |
1019 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1020 | * |
1021 | * Called with session lock held. | |
ccf10263 | 1022 | */ |
56a37563 JG |
1023 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1024 | int pid) | |
ccf10263 MD |
1025 | { |
1026 | int ret; | |
1027 | ||
1028 | rcu_read_lock(); | |
1029 | ||
1030 | switch (domain) { | |
1031 | case LTTNG_DOMAIN_KERNEL: | |
1032 | { | |
1033 | struct ltt_kernel_session *ksess; | |
1034 | ||
1035 | ksess = session->kernel_session; | |
1036 | ||
1037 | ret = kernel_track_pid(ksess, pid); | |
1038 | if (ret != LTTNG_OK) { | |
1039 | goto error; | |
1040 | } | |
1041 | ||
1042 | kernel_wait_quiescent(kernel_tracer_fd); | |
1043 | break; | |
1044 | } | |
ccf10263 | 1045 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1046 | { |
1047 | struct ltt_ust_session *usess; | |
1048 | ||
1049 | usess = session->ust_session; | |
1050 | ||
1051 | ret = trace_ust_track_pid(usess, pid); | |
1052 | if (ret != LTTNG_OK) { | |
1053 | goto error; | |
1054 | } | |
1055 | break; | |
1056 | } | |
ccf10263 MD |
1057 | default: |
1058 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1059 | goto error; | |
1060 | } | |
1061 | ||
1062 | ret = LTTNG_OK; | |
1063 | ||
1064 | error: | |
1065 | rcu_read_unlock(); | |
1066 | return ret; | |
1067 | } | |
1068 | ||
1069 | /* | |
1070 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1071 | * |
1072 | * Called with session lock held. | |
ccf10263 | 1073 | */ |
56a37563 JG |
1074 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1075 | int pid) | |
ccf10263 MD |
1076 | { |
1077 | int ret; | |
1078 | ||
1079 | rcu_read_lock(); | |
1080 | ||
1081 | switch (domain) { | |
1082 | case LTTNG_DOMAIN_KERNEL: | |
1083 | { | |
1084 | struct ltt_kernel_session *ksess; | |
1085 | ||
1086 | ksess = session->kernel_session; | |
1087 | ||
1088 | ret = kernel_untrack_pid(ksess, pid); | |
1089 | if (ret != LTTNG_OK) { | |
1090 | goto error; | |
1091 | } | |
1092 | ||
1093 | kernel_wait_quiescent(kernel_tracer_fd); | |
1094 | break; | |
1095 | } | |
ccf10263 | 1096 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1097 | { |
1098 | struct ltt_ust_session *usess; | |
1099 | ||
1100 | usess = session->ust_session; | |
1101 | ||
1102 | ret = trace_ust_untrack_pid(usess, pid); | |
1103 | if (ret != LTTNG_OK) { | |
1104 | goto error; | |
1105 | } | |
1106 | break; | |
1107 | } | |
ccf10263 MD |
1108 | default: |
1109 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1110 | goto error; | |
1111 | } | |
1112 | ||
1113 | ret = LTTNG_OK; | |
1114 | ||
1115 | error: | |
1116 | rcu_read_unlock(); | |
1117 | return ret; | |
1118 | } | |
1119 | ||
2f77fc4b DG |
1120 | /* |
1121 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1122 | * | |
1123 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1124 | */ | |
1125 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1126 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1127 | { |
1128 | int ret; | |
1129 | struct ltt_ust_session *usess = session->ust_session; | |
1130 | struct lttng_ht *chan_ht; | |
1f345e94 | 1131 | size_t len; |
2f77fc4b DG |
1132 | |
1133 | assert(session); | |
1134 | assert(attr); | |
7972aab2 | 1135 | assert(domain); |
2f77fc4b | 1136 | |
f5436bfc | 1137 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1138 | |
1139 | /* Validate channel name */ | |
1140 | if (attr->name[0] == '.' || | |
1141 | memchr(attr->name, '/', len) != NULL) { | |
1142 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1143 | goto end; | |
1144 | } | |
1145 | ||
2f77fc4b DG |
1146 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1147 | ||
03b4fdcf DG |
1148 | rcu_read_lock(); |
1149 | ||
ecc48a90 JD |
1150 | /* |
1151 | * Don't try to enable a channel if the session has been started at | |
1152 | * some point in time before. The tracer does not allow it. | |
1153 | */ | |
8382cf6f | 1154 | if (session->has_been_started) { |
ecc48a90 JD |
1155 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1156 | goto error; | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * If the session is a live session, remove the switch timer, the | |
1161 | * live timer does the same thing but sends also synchronisation | |
1162 | * beacons for inactive streams. | |
1163 | */ | |
1164 | if (session->live_timer > 0) { | |
1165 | attr->attr.live_timer_interval = session->live_timer; | |
1166 | attr->attr.switch_timer_interval = 0; | |
1167 | } | |
1168 | ||
33fbd469 DG |
1169 | /* |
1170 | * The ringbuffer (both in user space and kernel) behave badly in overwrite | |
1171 | * mode and with less than 2 subbuf so block it right away and send back an | |
1172 | * invalid attribute error. | |
1173 | */ | |
1174 | if (attr->attr.overwrite && attr->attr.num_subbuf < 2) { | |
1175 | ret = LTTNG_ERR_INVALID; | |
1176 | goto error; | |
1177 | } | |
1178 | ||
7972aab2 | 1179 | switch (domain->type) { |
2f77fc4b DG |
1180 | case LTTNG_DOMAIN_KERNEL: |
1181 | { | |
1182 | struct ltt_kernel_channel *kchan; | |
1183 | ||
2f77fc4b DG |
1184 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1185 | session->kernel_session); | |
1186 | if (kchan == NULL) { | |
1187 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1188 | if (attr->name[0] != '\0') { |
1189 | session->kernel_session->has_non_default_channel = 1; | |
1190 | } | |
2f77fc4b DG |
1191 | } else { |
1192 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1193 | } | |
1194 | ||
f73fabfd | 1195 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1196 | goto error; |
1197 | } | |
1198 | ||
784303b0 | 1199 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1200 | break; |
1201 | } | |
1202 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1203 | case LTTNG_DOMAIN_JUL: |
1204 | case LTTNG_DOMAIN_LOG4J: | |
1205 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1206 | { |
1207 | struct ltt_ust_channel *uchan; | |
1208 | ||
9232818f JG |
1209 | /* |
1210 | * FIXME | |
1211 | * | |
1212 | * Current agent implementation limitations force us to allow | |
1213 | * only one channel at once in "agent" subdomains. Each | |
1214 | * subdomain has a default channel name which must be strictly | |
1215 | * adhered to. | |
1216 | */ | |
1217 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1218 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1219 | LTTNG_SYMBOL_NAME_LEN)) { | |
1220 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1221 | goto error; | |
1222 | } | |
1223 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1224 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1225 | LTTNG_SYMBOL_NAME_LEN)) { | |
1226 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1227 | goto error; | |
1228 | } | |
1229 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1230 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1231 | LTTNG_SYMBOL_NAME_LEN)) { | |
1232 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1233 | goto error; | |
1234 | } | |
1235 | } | |
1236 | ||
2f77fc4b DG |
1237 | chan_ht = usess->domain_global.channels; |
1238 | ||
1239 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1240 | if (uchan == NULL) { | |
7972aab2 | 1241 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1242 | if (attr->name[0] != '\0') { |
1243 | usess->has_non_default_channel = 1; | |
1244 | } | |
2f77fc4b | 1245 | } else { |
7972aab2 | 1246 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1247 | } |
1248 | break; | |
1249 | } | |
2f77fc4b | 1250 | default: |
f73fabfd | 1251 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1252 | goto error; |
1253 | } | |
1254 | ||
1255 | error: | |
2223c96f | 1256 | rcu_read_unlock(); |
1f345e94 | 1257 | end: |
2f77fc4b DG |
1258 | return ret; |
1259 | } | |
1260 | ||
2f77fc4b DG |
1261 | /* |
1262 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1263 | */ | |
56a37563 JG |
1264 | int cmd_disable_event(struct ltt_session *session, |
1265 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1266 | struct lttng_event *event) |
2f77fc4b DG |
1267 | { |
1268 | int ret; | |
6e911cad MD |
1269 | char *event_name; |
1270 | ||
18a720cd MD |
1271 | DBG("Disable event command for event \'%s\'", event->name); |
1272 | ||
6e911cad | 1273 | event_name = event->name; |
7076b56e JG |
1274 | if (validate_event_name(event_name)) { |
1275 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1276 | goto error; | |
1277 | } | |
6e911cad | 1278 | |
9b7431cf JG |
1279 | /* Error out on unhandled search criteria */ |
1280 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1281 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1282 | ret = LTTNG_ERR_UNK; |
1283 | goto error; | |
6e911cad | 1284 | } |
2f77fc4b | 1285 | |
2223c96f DG |
1286 | rcu_read_lock(); |
1287 | ||
2f77fc4b DG |
1288 | switch (domain) { |
1289 | case LTTNG_DOMAIN_KERNEL: | |
1290 | { | |
1291 | struct ltt_kernel_channel *kchan; | |
1292 | struct ltt_kernel_session *ksess; | |
1293 | ||
1294 | ksess = session->kernel_session; | |
1295 | ||
85076754 MD |
1296 | /* |
1297 | * If a non-default channel has been created in the | |
1298 | * session, explicitely require that -c chan_name needs | |
1299 | * to be provided. | |
1300 | */ | |
1301 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1302 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1303 | goto error_unlock; |
85076754 MD |
1304 | } |
1305 | ||
2f77fc4b DG |
1306 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1307 | if (kchan == NULL) { | |
f73fabfd | 1308 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1309 | goto error_unlock; |
2f77fc4b DG |
1310 | } |
1311 | ||
6e911cad MD |
1312 | switch (event->type) { |
1313 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1314 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1315 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1316 | case LTTNG_EVENT_PROBE: |
1317 | case LTTNG_EVENT_FUNCTION: | |
1318 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1319 | if (event_name[0] == '\0') { | |
1320 | ret = event_kernel_disable_event(kchan, | |
1321 | NULL, event->type); | |
29c62722 | 1322 | } else { |
d0ae4ea8 | 1323 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1324 | event_name, event->type); |
29c62722 | 1325 | } |
6e911cad | 1326 | if (ret != LTTNG_OK) { |
7076b56e | 1327 | goto error_unlock; |
6e911cad MD |
1328 | } |
1329 | break; | |
6e911cad MD |
1330 | default: |
1331 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1332 | goto error_unlock; |
2f77fc4b DG |
1333 | } |
1334 | ||
1335 | kernel_wait_quiescent(kernel_tracer_fd); | |
1336 | break; | |
1337 | } | |
1338 | case LTTNG_DOMAIN_UST: | |
1339 | { | |
1340 | struct ltt_ust_channel *uchan; | |
1341 | struct ltt_ust_session *usess; | |
1342 | ||
1343 | usess = session->ust_session; | |
1344 | ||
7076b56e JG |
1345 | if (validate_ust_event_name(event_name)) { |
1346 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1347 | goto error_unlock; | |
1348 | } | |
1349 | ||
85076754 MD |
1350 | /* |
1351 | * If a non-default channel has been created in the | |
9550ee81 | 1352 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1353 | * to be provided. |
1354 | */ | |
1355 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1356 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1357 | goto error_unlock; |
85076754 MD |
1358 | } |
1359 | ||
2f77fc4b DG |
1360 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1361 | channel_name); | |
1362 | if (uchan == NULL) { | |
f73fabfd | 1363 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1364 | goto error_unlock; |
2f77fc4b DG |
1365 | } |
1366 | ||
6e911cad MD |
1367 | switch (event->type) { |
1368 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1369 | /* |
1370 | * An empty event name means that everything | |
1371 | * should be disabled. | |
1372 | */ | |
1373 | if (event->name[0] == '\0') { | |
1374 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1375 | } else { |
1376 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1377 | event_name); | |
1378 | } | |
6e911cad | 1379 | if (ret != LTTNG_OK) { |
7076b56e | 1380 | goto error_unlock; |
6e911cad MD |
1381 | } |
1382 | break; | |
1383 | default: | |
1384 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1385 | goto error_unlock; |
2f77fc4b DG |
1386 | } |
1387 | ||
1388 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1389 | channel_name); | |
1390 | break; | |
1391 | } | |
5cdb6027 | 1392 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1393 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1394 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1395 | { |
fefd409b | 1396 | struct agent *agt; |
f20baf8e DG |
1397 | struct ltt_ust_session *usess = session->ust_session; |
1398 | ||
1399 | assert(usess); | |
1400 | ||
6e911cad MD |
1401 | switch (event->type) { |
1402 | case LTTNG_EVENT_ALL: | |
1403 | break; | |
1404 | default: | |
1405 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1406 | goto error_unlock; |
6e911cad MD |
1407 | } |
1408 | ||
5cdb6027 | 1409 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1410 | if (!agt) { |
1411 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1412 | goto error_unlock; |
fefd409b | 1413 | } |
b3639870 JR |
1414 | /* |
1415 | * An empty event name means that everything | |
1416 | * should be disabled. | |
1417 | */ | |
1418 | if (event->name[0] == '\0') { | |
18a720cd MD |
1419 | ret = event_agent_disable_all(usess, agt); |
1420 | } else { | |
1421 | ret = event_agent_disable(usess, agt, event_name); | |
1422 | } | |
f20baf8e | 1423 | if (ret != LTTNG_OK) { |
7076b56e | 1424 | goto error_unlock; |
f20baf8e DG |
1425 | } |
1426 | ||
1427 | break; | |
1428 | } | |
2f77fc4b | 1429 | default: |
f73fabfd | 1430 | ret = LTTNG_ERR_UND; |
7076b56e | 1431 | goto error_unlock; |
2f77fc4b DG |
1432 | } |
1433 | ||
f73fabfd | 1434 | ret = LTTNG_OK; |
2f77fc4b | 1435 | |
7076b56e | 1436 | error_unlock: |
2223c96f | 1437 | rcu_read_unlock(); |
7076b56e | 1438 | error: |
2f77fc4b DG |
1439 | return ret; |
1440 | } | |
1441 | ||
2f77fc4b DG |
1442 | /* |
1443 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1444 | */ | |
56a37563 | 1445 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1446 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1447 | { |
d5979e4a | 1448 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1449 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1450 | ||
1451 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1452 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1453 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1454 | } | |
2f77fc4b DG |
1455 | |
1456 | switch (domain) { | |
1457 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1458 | assert(session->kernel_session); |
1459 | ||
1460 | if (session->kernel_session->channel_count == 0) { | |
1461 | /* Create default channel */ | |
1462 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1463 | if (ret != LTTNG_OK) { | |
1464 | goto error; | |
1465 | } | |
d5979e4a | 1466 | chan_kern_created = 1; |
979e618e | 1467 | } |
2f77fc4b | 1468 | /* Add kernel context to kernel tracer */ |
601d5acf | 1469 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1470 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1471 | goto error; |
1472 | } | |
1473 | break; | |
bdf64013 JG |
1474 | case LTTNG_DOMAIN_JUL: |
1475 | case LTTNG_DOMAIN_LOG4J: | |
1476 | { | |
1477 | /* | |
1478 | * Validate channel name. | |
1479 | * If no channel name is given and the domain is JUL or LOG4J, | |
1480 | * set it to the appropriate domain-specific channel name. If | |
1481 | * a name is provided but does not match the expexted channel | |
1482 | * name, return an error. | |
1483 | */ | |
1484 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1485 | strcmp(channel_name, | |
1486 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1487 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1488 | goto error; | |
1489 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1490 | strcmp(channel_name, | |
1491 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1492 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1493 | goto error; | |
1494 | } | |
a93b3916 | 1495 | /* break is _not_ missing here. */ |
bdf64013 | 1496 | } |
2f77fc4b DG |
1497 | case LTTNG_DOMAIN_UST: |
1498 | { | |
1499 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1500 | unsigned int chan_count; |
1501 | ||
2f77fc4b DG |
1502 | assert(usess); |
1503 | ||
85076754 | 1504 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1505 | if (chan_count == 0) { |
1506 | struct lttng_channel *attr; | |
1507 | /* Create default channel */ | |
0a9c6494 | 1508 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1509 | if (attr == NULL) { |
1510 | ret = LTTNG_ERR_FATAL; | |
1511 | goto error; | |
1512 | } | |
1513 | ||
7972aab2 | 1514 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1515 | if (ret != LTTNG_OK) { |
1516 | free(attr); | |
1517 | goto error; | |
1518 | } | |
1519 | free(attr); | |
d5979e4a | 1520 | chan_ust_created = 1; |
979e618e DG |
1521 | } |
1522 | ||
601d5acf | 1523 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1524 | free(app_ctx_provider_name); |
1525 | free(app_ctx_name); | |
1526 | app_ctx_name = NULL; | |
1527 | app_ctx_provider_name = NULL; | |
f73fabfd | 1528 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1529 | goto error; |
1530 | } | |
1531 | break; | |
1532 | } | |
2f77fc4b | 1533 | default: |
f73fabfd | 1534 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1535 | goto error; |
1536 | } | |
1537 | ||
bdf64013 JG |
1538 | ret = LTTNG_OK; |
1539 | goto end; | |
2f77fc4b DG |
1540 | |
1541 | error: | |
d5979e4a DG |
1542 | if (chan_kern_created) { |
1543 | struct ltt_kernel_channel *kchan = | |
1544 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1545 | session->kernel_session); | |
1546 | /* Created previously, this should NOT fail. */ | |
1547 | assert(kchan); | |
1548 | kernel_destroy_channel(kchan); | |
1549 | } | |
1550 | ||
1551 | if (chan_ust_created) { | |
1552 | struct ltt_ust_channel *uchan = | |
1553 | trace_ust_find_channel_by_name( | |
1554 | session->ust_session->domain_global.channels, | |
1555 | DEFAULT_CHANNEL_NAME); | |
1556 | /* Created previously, this should NOT fail. */ | |
1557 | assert(uchan); | |
1558 | /* Remove from the channel list of the session. */ | |
1559 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1560 | uchan); | |
1561 | trace_ust_destroy_channel(uchan); | |
1562 | } | |
bdf64013 JG |
1563 | end: |
1564 | free(app_ctx_provider_name); | |
1565 | free(app_ctx_name); | |
2f77fc4b DG |
1566 | return ret; |
1567 | } | |
1568 | ||
930a2e99 JG |
1569 | static int validate_event_name(const char *name) |
1570 | { | |
1571 | int ret = 0; | |
1572 | const char *c = name; | |
1573 | const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN; | |
bf9807db | 1574 | bool null_terminated = false; |
930a2e99 JG |
1575 | |
1576 | /* | |
1577 | * Make sure that unescaped wildcards are only used as the last | |
1578 | * character of the event name. | |
1579 | */ | |
1580 | while (c < event_name_end) { | |
1581 | switch (*c) { | |
1582 | case '\0': | |
bf9807db | 1583 | null_terminated = true; |
930a2e99 JG |
1584 | goto end; |
1585 | case '\\': | |
1586 | c++; | |
1587 | break; | |
1588 | case '*': | |
1589 | if ((c + 1) < event_name_end && *(c + 1)) { | |
1590 | /* Wildcard is not the last character */ | |
1591 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1592 | goto end; | |
1593 | } | |
1594 | default: | |
1595 | break; | |
1596 | } | |
1597 | c++; | |
1598 | } | |
1599 | end: | |
bf9807db JG |
1600 | if (!ret && !null_terminated) { |
1601 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1602 | } | |
930a2e99 JG |
1603 | return ret; |
1604 | } | |
1605 | ||
dac8e046 JG |
1606 | static inline bool name_starts_with(const char *name, const char *prefix) |
1607 | { | |
1608 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1609 | ||
1610 | return !strncmp(name, prefix, max_cmp_len); | |
1611 | } | |
1612 | ||
1613 | /* Perform userspace-specific event name validation */ | |
1614 | static int validate_ust_event_name(const char *name) | |
1615 | { | |
1616 | int ret = 0; | |
1617 | ||
1618 | if (!name) { | |
1619 | ret = -1; | |
1620 | goto end; | |
1621 | } | |
1622 | ||
1623 | /* | |
1624 | * Check name against all internal UST event component namespaces used | |
1625 | * by the agents. | |
1626 | */ | |
1627 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1628 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1629 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1630 | ret = -1; | |
1631 | } | |
1632 | ||
1633 | end: | |
1634 | return ret; | |
1635 | } | |
88f06f15 | 1636 | |
2f77fc4b | 1637 | /* |
88f06f15 JG |
1638 | * Internal version of cmd_enable_event() with a supplemental |
1639 | * "internal_event" flag which is used to enable internal events which should | |
1640 | * be hidden from clients. Such events are used in the agent implementation to | |
1641 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1642 | */ |
88f06f15 JG |
1643 | static int _cmd_enable_event(struct ltt_session *session, |
1644 | struct lttng_domain *domain, | |
025faf73 | 1645 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1646 | char *filter_expression, |
db8f1377 JI |
1647 | struct lttng_filter_bytecode *filter, |
1648 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1649 | int wpipe, bool internal_event) |
2f77fc4b | 1650 | { |
e5f5db7f | 1651 | int ret, channel_created = 0; |
2f77fc4b DG |
1652 | struct lttng_channel *attr; |
1653 | ||
1654 | assert(session); | |
1655 | assert(event); | |
1656 | assert(channel_name); | |
1657 | ||
2a385866 JG |
1658 | /* If we have a filter, we must have its filter expression */ |
1659 | assert(!(!!filter_expression ^ !!filter)); | |
1660 | ||
18a720cd MD |
1661 | DBG("Enable event command for event \'%s\'", event->name); |
1662 | ||
f5ac4bd7 MD |
1663 | rcu_read_lock(); |
1664 | ||
930a2e99 JG |
1665 | ret = validate_event_name(event->name); |
1666 | if (ret) { | |
1667 | goto error; | |
1668 | } | |
1669 | ||
7972aab2 | 1670 | switch (domain->type) { |
2f77fc4b DG |
1671 | case LTTNG_DOMAIN_KERNEL: |
1672 | { | |
1673 | struct ltt_kernel_channel *kchan; | |
1674 | ||
85076754 MD |
1675 | /* |
1676 | * If a non-default channel has been created in the | |
1677 | * session, explicitely require that -c chan_name needs | |
1678 | * to be provided. | |
1679 | */ | |
1680 | if (session->kernel_session->has_non_default_channel | |
1681 | && channel_name[0] == '\0') { | |
1682 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1683 | goto error; | |
1684 | } | |
1685 | ||
2f77fc4b DG |
1686 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1687 | session->kernel_session); | |
1688 | if (kchan == NULL) { | |
0a9c6494 DG |
1689 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1690 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1691 | if (attr == NULL) { |
f73fabfd | 1692 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1693 | goto error; |
1694 | } | |
1695 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1696 | ||
1697 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1698 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1699 | free(attr); |
1700 | goto error; | |
1701 | } | |
1702 | free(attr); | |
e5f5db7f DG |
1703 | |
1704 | channel_created = 1; | |
2f77fc4b DG |
1705 | } |
1706 | ||
1707 | /* Get the newly created kernel channel pointer */ | |
1708 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1709 | session->kernel_session); | |
1710 | if (kchan == NULL) { | |
1711 | /* This sould not happen... */ | |
f73fabfd | 1712 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1713 | goto error; |
1714 | } | |
1715 | ||
6e911cad MD |
1716 | switch (event->type) { |
1717 | case LTTNG_EVENT_ALL: | |
29c62722 | 1718 | { |
00a62084 MD |
1719 | char *filter_expression_a = NULL; |
1720 | struct lttng_filter_bytecode *filter_a = NULL; | |
1721 | ||
1722 | /* | |
1723 | * We need to duplicate filter_expression and filter, | |
1724 | * because ownership is passed to first enable | |
1725 | * event. | |
1726 | */ | |
1727 | if (filter_expression) { | |
1728 | filter_expression_a = strdup(filter_expression); | |
1729 | if (!filter_expression_a) { | |
1730 | ret = LTTNG_ERR_FATAL; | |
1731 | goto error; | |
1732 | } | |
1733 | } | |
1734 | if (filter) { | |
1735 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1736 | if (!filter_a) { | |
1737 | free(filter_expression_a); | |
1738 | ret = LTTNG_ERR_FATAL; | |
1739 | goto error; | |
1740 | } | |
1741 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1742 | } | |
29c62722 | 1743 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1744 | ret = event_kernel_enable_event(kchan, event, |
1745 | filter_expression, filter); | |
a969e101 MD |
1746 | /* We have passed ownership */ |
1747 | filter_expression = NULL; | |
1748 | filter = NULL; | |
29c62722 MD |
1749 | if (ret != LTTNG_OK) { |
1750 | if (channel_created) { | |
1751 | /* Let's not leak a useless channel. */ | |
1752 | kernel_destroy_channel(kchan); | |
1753 | } | |
00a62084 MD |
1754 | free(filter_expression_a); |
1755 | free(filter_a); | |
29c62722 MD |
1756 | goto error; |
1757 | } | |
1758 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1759 | ret = event_kernel_enable_event(kchan, event, |
1760 | filter_expression_a, filter_a); | |
60d21fa2 AB |
1761 | /* We have passed ownership */ |
1762 | filter_expression_a = NULL; | |
1763 | filter_a = NULL; | |
29c62722 MD |
1764 | if (ret != LTTNG_OK) { |
1765 | goto error; | |
1766 | } | |
1767 | break; | |
1768 | } | |
6e6ef3d7 DG |
1769 | case LTTNG_EVENT_PROBE: |
1770 | case LTTNG_EVENT_FUNCTION: | |
1771 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1772 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
1773 | ret = event_kernel_enable_event(kchan, event, |
1774 | filter_expression, filter); | |
a969e101 MD |
1775 | /* We have passed ownership */ |
1776 | filter_expression = NULL; | |
1777 | filter = NULL; | |
6e911cad MD |
1778 | if (ret != LTTNG_OK) { |
1779 | if (channel_created) { | |
1780 | /* Let's not leak a useless channel. */ | |
1781 | kernel_destroy_channel(kchan); | |
1782 | } | |
1783 | goto error; | |
e5f5db7f | 1784 | } |
6e911cad MD |
1785 | break; |
1786 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1787 | ret = event_kernel_enable_event(kchan, event, |
1788 | filter_expression, filter); | |
a969e101 MD |
1789 | /* We have passed ownership */ |
1790 | filter_expression = NULL; | |
1791 | filter = NULL; | |
e2b957af MD |
1792 | if (ret != LTTNG_OK) { |
1793 | goto error; | |
1794 | } | |
6e911cad MD |
1795 | break; |
1796 | default: | |
1797 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1798 | goto error; |
1799 | } | |
1800 | ||
1801 | kernel_wait_quiescent(kernel_tracer_fd); | |
1802 | break; | |
1803 | } | |
1804 | case LTTNG_DOMAIN_UST: | |
1805 | { | |
1806 | struct ltt_ust_channel *uchan; | |
1807 | struct ltt_ust_session *usess = session->ust_session; | |
1808 | ||
1809 | assert(usess); | |
1810 | ||
85076754 MD |
1811 | /* |
1812 | * If a non-default channel has been created in the | |
1813 | * session, explicitely require that -c chan_name needs | |
1814 | * to be provided. | |
1815 | */ | |
1816 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1817 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1818 | goto error; | |
1819 | } | |
1820 | ||
2f77fc4b DG |
1821 | /* Get channel from global UST domain */ |
1822 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1823 | channel_name); | |
1824 | if (uchan == NULL) { | |
1825 | /* Create default channel */ | |
0a9c6494 DG |
1826 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
1827 | usess->buffer_type); | |
2f77fc4b | 1828 | if (attr == NULL) { |
f73fabfd | 1829 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1830 | goto error; |
1831 | } | |
1832 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1833 | ||
1834 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1835 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1836 | free(attr); |
1837 | goto error; | |
1838 | } | |
1839 | free(attr); | |
1840 | ||
1841 | /* Get the newly created channel reference back */ | |
1842 | uchan = trace_ust_find_channel_by_name( | |
1843 | usess->domain_global.channels, channel_name); | |
1844 | assert(uchan); | |
1845 | } | |
1846 | ||
141feb8c JG |
1847 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
1848 | /* | |
1849 | * Don't allow users to add UST events to channels which | |
1850 | * are assigned to a userspace subdomain (JUL, Log4J, | |
1851 | * Python, etc.). | |
1852 | */ | |
1853 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
1854 | goto error; | |
1855 | } | |
1856 | ||
dac8e046 JG |
1857 | if (!internal_event) { |
1858 | /* | |
1859 | * Ensure the event name is not reserved for internal | |
1860 | * use. | |
1861 | */ | |
1862 | ret = validate_ust_event_name(event->name); | |
1863 | if (ret) { | |
1864 | WARN("Userspace event name %s failed validation.", | |
1865 | event->name ? | |
1866 | event->name : "NULL"); | |
1867 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1868 | goto error; | |
1869 | } | |
1870 | } | |
1871 | ||
2f77fc4b | 1872 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 1873 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
1874 | filter_expression, filter, exclusion, |
1875 | internal_event); | |
49d21f93 MD |
1876 | /* We have passed ownership */ |
1877 | filter_expression = NULL; | |
1878 | filter = NULL; | |
1879 | exclusion = NULL; | |
94382e15 JG |
1880 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
1881 | goto already_enabled; | |
1882 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
1883 | goto error; |
1884 | } | |
1885 | break; | |
1886 | } | |
5cdb6027 | 1887 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1888 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1889 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1890 | { |
da6c3a50 | 1891 | const char *default_event_name, *default_chan_name; |
fefd409b | 1892 | struct agent *agt; |
f20baf8e DG |
1893 | struct lttng_event uevent; |
1894 | struct lttng_domain tmp_dom; | |
1895 | struct ltt_ust_session *usess = session->ust_session; | |
1896 | ||
1897 | assert(usess); | |
1898 | ||
5cdb6027 | 1899 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 1900 | if (!agt) { |
5cdb6027 | 1901 | agt = agent_create(domain->type); |
fefd409b | 1902 | if (!agt) { |
e5b3c48c | 1903 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
1904 | goto error; |
1905 | } | |
1906 | agent_add(agt, usess->agents); | |
1907 | } | |
1908 | ||
022d91ba | 1909 | /* Create the default tracepoint. */ |
996de3c7 | 1910 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
1911 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
1912 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
1913 | default_event_name = event_get_default_agent_ust_name( |
1914 | domain->type); | |
da6c3a50 | 1915 | if (!default_event_name) { |
e5b3c48c | 1916 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 1917 | goto error; |
f43f95a9 | 1918 | } |
da6c3a50 | 1919 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
1920 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
1921 | ||
1922 | /* | |
1923 | * The domain type is changed because we are about to enable the | |
1924 | * default channel and event for the JUL domain that are hardcoded. | |
1925 | * This happens in the UST domain. | |
1926 | */ | |
1927 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
1928 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
1929 | ||
0e115563 DG |
1930 | switch (domain->type) { |
1931 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 1932 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
1933 | break; |
1934 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 1935 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
1936 | break; |
1937 | case LTTNG_DOMAIN_PYTHON: | |
1938 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
1939 | break; | |
1940 | default: | |
e98a44b0 | 1941 | /* The switch/case we are in makes this impossible */ |
0e115563 | 1942 | assert(0); |
da6c3a50 DG |
1943 | } |
1944 | ||
971da06a | 1945 | { |
8404118c | 1946 | char *filter_expression_copy = NULL; |
51755dc8 | 1947 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
1948 | |
1949 | if (filter) { | |
51755dc8 JG |
1950 | const size_t filter_size = sizeof( |
1951 | struct lttng_filter_bytecode) | |
1952 | + filter->len; | |
1953 | ||
1954 | filter_copy = zmalloc(filter_size); | |
971da06a | 1955 | if (!filter_copy) { |
018096a4 | 1956 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 1957 | goto error; |
971da06a | 1958 | } |
51755dc8 | 1959 | memcpy(filter_copy, filter, filter_size); |
971da06a | 1960 | |
8404118c JG |
1961 | filter_expression_copy = |
1962 | strdup(filter_expression); | |
1963 | if (!filter_expression) { | |
1964 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
1965 | } |
1966 | ||
1967 | if (!filter_expression_copy || !filter_copy) { | |
1968 | free(filter_expression_copy); | |
1969 | free(filter_copy); | |
1970 | goto error; | |
8404118c | 1971 | } |
971da06a JG |
1972 | } |
1973 | ||
88f06f15 | 1974 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 1975 | (char *) default_chan_name, |
8404118c JG |
1976 | &uevent, filter_expression_copy, |
1977 | filter_copy, NULL, wpipe); | |
971da06a JG |
1978 | } |
1979 | ||
94382e15 JG |
1980 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
1981 | goto already_enabled; | |
1982 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
1983 | goto error; |
1984 | } | |
1985 | ||
1986 | /* The wild card * means that everything should be enabled. */ | |
1987 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
1988 | ret = event_agent_enable_all(usess, agt, event, filter, |
1989 | filter_expression); | |
f20baf8e | 1990 | } else { |
8404118c JG |
1991 | ret = event_agent_enable(usess, agt, event, filter, |
1992 | filter_expression); | |
f20baf8e | 1993 | } |
51755dc8 JG |
1994 | filter = NULL; |
1995 | filter_expression = NULL; | |
f20baf8e DG |
1996 | if (ret != LTTNG_OK) { |
1997 | goto error; | |
1998 | } | |
1999 | ||
2000 | break; | |
2001 | } | |
2f77fc4b | 2002 | default: |
f73fabfd | 2003 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2004 | goto error; |
2005 | } | |
2006 | ||
f73fabfd | 2007 | ret = LTTNG_OK; |
2f77fc4b | 2008 | |
94382e15 | 2009 | already_enabled: |
2f77fc4b | 2010 | error: |
49d21f93 MD |
2011 | free(filter_expression); |
2012 | free(filter); | |
2013 | free(exclusion); | |
2223c96f | 2014 | rcu_read_unlock(); |
2f77fc4b DG |
2015 | return ret; |
2016 | } | |
2017 | ||
88f06f15 JG |
2018 | /* |
2019 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2020 | * We own filter, exclusion, and filter_expression. | |
2021 | */ | |
2022 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2023 | char *channel_name, struct lttng_event *event, | |
2024 | char *filter_expression, | |
2025 | struct lttng_filter_bytecode *filter, | |
2026 | struct lttng_event_exclusion *exclusion, | |
2027 | int wpipe) | |
2028 | { | |
2029 | return _cmd_enable_event(session, domain, channel_name, event, | |
2030 | filter_expression, filter, exclusion, wpipe, false); | |
2031 | } | |
2032 | ||
2033 | /* | |
2034 | * Enable an event which is internal to LTTng. An internal should | |
2035 | * never be made visible to clients and are immune to checks such as | |
2036 | * reserved names. | |
2037 | */ | |
2038 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2039 | struct lttng_domain *domain, | |
2040 | char *channel_name, struct lttng_event *event, | |
2041 | char *filter_expression, | |
2042 | struct lttng_filter_bytecode *filter, | |
2043 | struct lttng_event_exclusion *exclusion, | |
2044 | int wpipe) | |
2045 | { | |
2046 | return _cmd_enable_event(session, domain, channel_name, event, | |
2047 | filter_expression, filter, exclusion, wpipe, true); | |
2048 | } | |
2049 | ||
2f77fc4b DG |
2050 | /* |
2051 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2052 | */ | |
56a37563 JG |
2053 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2054 | struct lttng_event **events) | |
2f77fc4b DG |
2055 | { |
2056 | int ret; | |
2057 | ssize_t nb_events = 0; | |
2058 | ||
2059 | switch (domain) { | |
2060 | case LTTNG_DOMAIN_KERNEL: | |
2061 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2062 | if (nb_events < 0) { | |
f73fabfd | 2063 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2064 | goto error; |
2065 | } | |
2066 | break; | |
2067 | case LTTNG_DOMAIN_UST: | |
2068 | nb_events = ust_app_list_events(events); | |
2069 | if (nb_events < 0) { | |
f73fabfd | 2070 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2071 | goto error; |
2072 | } | |
2073 | break; | |
5cdb6027 | 2074 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2075 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2076 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2077 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2078 | if (nb_events < 0) { |
2079 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2080 | goto error; | |
2081 | } | |
2082 | break; | |
2f77fc4b | 2083 | default: |
f73fabfd | 2084 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2085 | goto error; |
2086 | } | |
2087 | ||
2088 | return nb_events; | |
2089 | ||
2090 | error: | |
2091 | /* Return negative value to differentiate return code */ | |
2092 | return -ret; | |
2093 | } | |
2094 | ||
2095 | /* | |
2096 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2097 | */ | |
56a37563 | 2098 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2099 | struct lttng_event_field **fields) |
2100 | { | |
2101 | int ret; | |
2102 | ssize_t nb_fields = 0; | |
2103 | ||
2104 | switch (domain) { | |
2105 | case LTTNG_DOMAIN_UST: | |
2106 | nb_fields = ust_app_list_event_fields(fields); | |
2107 | if (nb_fields < 0) { | |
f73fabfd | 2108 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2109 | goto error; |
2110 | } | |
2111 | break; | |
2112 | case LTTNG_DOMAIN_KERNEL: | |
2113 | default: /* fall-through */ | |
f73fabfd | 2114 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2115 | goto error; |
2116 | } | |
2117 | ||
2118 | return nb_fields; | |
2119 | ||
2120 | error: | |
2121 | /* Return negative value to differentiate return code */ | |
2122 | return -ret; | |
2123 | } | |
2124 | ||
834978fd DG |
2125 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2126 | { | |
2127 | return syscall_table_list(events); | |
2128 | } | |
2129 | ||
a5dfbb9d MD |
2130 | /* |
2131 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2132 | * | |
2133 | * Called with session lock held. | |
2134 | */ | |
2135 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2136 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2137 | { |
2138 | int ret; | |
2139 | ssize_t nr_pids = 0; | |
2140 | ||
2141 | switch (domain) { | |
2142 | case LTTNG_DOMAIN_KERNEL: | |
2143 | { | |
2144 | struct ltt_kernel_session *ksess; | |
2145 | ||
2146 | ksess = session->kernel_session; | |
2147 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2148 | if (nr_pids < 0) { | |
2149 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2150 | goto error; | |
2151 | } | |
2152 | break; | |
2153 | } | |
2154 | case LTTNG_DOMAIN_UST: | |
2155 | { | |
2156 | struct ltt_ust_session *usess; | |
2157 | ||
2158 | usess = session->ust_session; | |
2159 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2160 | if (nr_pids < 0) { | |
2161 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2162 | goto error; | |
2163 | } | |
2164 | break; | |
2165 | } | |
2166 | case LTTNG_DOMAIN_LOG4J: | |
2167 | case LTTNG_DOMAIN_JUL: | |
2168 | case LTTNG_DOMAIN_PYTHON: | |
2169 | default: | |
2170 | ret = LTTNG_ERR_UND; | |
2171 | goto error; | |
2172 | } | |
2173 | ||
2174 | return nr_pids; | |
2175 | ||
2176 | error: | |
2177 | /* Return negative value to differentiate return code */ | |
2178 | return -ret; | |
2179 | } | |
2180 | ||
2f77fc4b DG |
2181 | /* |
2182 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2183 | * |
2184 | * Called with session mutex held. | |
2f77fc4b DG |
2185 | */ |
2186 | int cmd_start_trace(struct ltt_session *session) | |
2187 | { | |
2188 | int ret; | |
cde3e505 | 2189 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2190 | struct ltt_kernel_session *ksession; |
2191 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2192 | |
2193 | assert(session); | |
2194 | ||
2195 | /* Ease our life a bit ;) */ | |
2196 | ksession = session->kernel_session; | |
2197 | usess = session->ust_session; | |
2198 | ||
8382cf6f DG |
2199 | /* Is the session already started? */ |
2200 | if (session->active) { | |
f73fabfd | 2201 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2202 | goto error; |
2203 | } | |
2204 | ||
cde3e505 DG |
2205 | /* |
2206 | * Starting a session without channel is useless since after that it's not | |
2207 | * possible to enable channel thus inform the client. | |
2208 | */ | |
2209 | if (usess && usess->domain_global.channels) { | |
2210 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2211 | } | |
2212 | if (ksession) { | |
2213 | nb_chan += ksession->channel_count; | |
2214 | } | |
2215 | if (!nb_chan) { | |
2216 | ret = LTTNG_ERR_NO_CHANNEL; | |
2217 | goto error; | |
2218 | } | |
2219 | ||
2f77fc4b DG |
2220 | /* Kernel tracing */ |
2221 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2222 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2223 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2224 | goto error; |
2225 | } | |
2f77fc4b DG |
2226 | } |
2227 | ||
2228 | /* Flag session that trace should start automatically */ | |
2229 | if (usess) { | |
14fb1ebe DG |
2230 | /* |
2231 | * Even though the start trace might fail, flag this session active so | |
2232 | * other application coming in are started by default. | |
2233 | */ | |
2234 | usess->active = 1; | |
2f77fc4b DG |
2235 | |
2236 | ret = ust_app_start_trace_all(usess); | |
2237 | if (ret < 0) { | |
f73fabfd | 2238 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2239 | goto error; |
2240 | } | |
2241 | } | |
2242 | ||
8382cf6f DG |
2243 | /* Flag this after a successful start. */ |
2244 | session->has_been_started = 1; | |
2245 | session->active = 1; | |
9b6c7ec5 | 2246 | |
f73fabfd | 2247 | ret = LTTNG_OK; |
2f77fc4b DG |
2248 | |
2249 | error: | |
2250 | return ret; | |
2251 | } | |
2252 | ||
2253 | /* | |
2254 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2255 | */ | |
2256 | int cmd_stop_trace(struct ltt_session *session) | |
2257 | { | |
2258 | int ret; | |
2259 | struct ltt_kernel_channel *kchan; | |
2260 | struct ltt_kernel_session *ksession; | |
2261 | struct ltt_ust_session *usess; | |
2262 | ||
2263 | assert(session); | |
2264 | ||
2265 | /* Short cut */ | |
2266 | ksession = session->kernel_session; | |
2267 | usess = session->ust_session; | |
2268 | ||
8382cf6f DG |
2269 | /* Session is not active. Skip everythong and inform the client. */ |
2270 | if (!session->active) { | |
f73fabfd | 2271 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2272 | goto error; |
2273 | } | |
2274 | ||
2f77fc4b | 2275 | /* Kernel tracer */ |
14fb1ebe | 2276 | if (ksession && ksession->active) { |
2f77fc4b DG |
2277 | DBG("Stop kernel tracing"); |
2278 | ||
2279 | /* Flush metadata if exist */ | |
2280 | if (ksession->metadata_stream_fd >= 0) { | |
2281 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2282 | if (ret < 0) { | |
2283 | ERR("Kernel metadata flush failed"); | |
2284 | } | |
2285 | } | |
2286 | ||
2287 | /* Flush all buffers before stopping */ | |
2288 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2289 | ret = kernel_flush_buffer(kchan); | |
2290 | if (ret < 0) { | |
2291 | ERR("Kernel flush buffer error"); | |
2292 | } | |
2293 | } | |
2294 | ||
2295 | ret = kernel_stop_session(ksession); | |
2296 | if (ret < 0) { | |
f73fabfd | 2297 | ret = LTTNG_ERR_KERN_STOP_FAIL; |
2f77fc4b DG |
2298 | goto error; |
2299 | } | |
2300 | ||
2301 | kernel_wait_quiescent(kernel_tracer_fd); | |
9b6c7ec5 | 2302 | |
14fb1ebe | 2303 | ksession->active = 0; |
2f77fc4b DG |
2304 | } |
2305 | ||
14fb1ebe DG |
2306 | if (usess && usess->active) { |
2307 | /* | |
2308 | * Even though the stop trace might fail, flag this session inactive so | |
2309 | * other application coming in are not started by default. | |
2310 | */ | |
2311 | usess->active = 0; | |
2f77fc4b DG |
2312 | |
2313 | ret = ust_app_stop_trace_all(usess); | |
2314 | if (ret < 0) { | |
f73fabfd | 2315 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2316 | goto error; |
2317 | } | |
2318 | } | |
2319 | ||
8382cf6f DG |
2320 | /* Flag inactive after a successful stop. */ |
2321 | session->active = 0; | |
f73fabfd | 2322 | ret = LTTNG_OK; |
2f77fc4b DG |
2323 | |
2324 | error: | |
2325 | return ret; | |
2326 | } | |
2327 | ||
2328 | /* | |
2329 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2330 | */ | |
bda32d56 JG |
2331 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2332 | struct lttng_uri *uris) | |
2f77fc4b DG |
2333 | { |
2334 | int ret, i; | |
2335 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2336 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2337 | |
2338 | assert(session); | |
2339 | assert(uris); | |
2340 | assert(nb_uri > 0); | |
2341 | ||
8382cf6f DG |
2342 | /* Can't set consumer URI if the session is active. */ |
2343 | if (session->active) { | |
f73fabfd | 2344 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2345 | goto error; |
2346 | } | |
2347 | ||
bda32d56 | 2348 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2349 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2350 | ret = add_uri_to_consumer(session->consumer, |
2351 | &uris[i], 0, session->name); | |
a74934ba | 2352 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2353 | goto error; |
2354 | } | |
2f77fc4b DG |
2355 | } |
2356 | ||
bda32d56 JG |
2357 | /* Set UST session URIs */ |
2358 | if (session->ust_session) { | |
2359 | for (i = 0; i < nb_uri; i++) { | |
2360 | ret = add_uri_to_consumer( | |
2361 | session->ust_session->consumer, | |
2362 | &uris[i], LTTNG_DOMAIN_UST, | |
2363 | session->name); | |
2364 | if (ret != LTTNG_OK) { | |
2365 | goto error; | |
2366 | } | |
2367 | } | |
2368 | } | |
2369 | ||
2370 | /* Set kernel session URIs */ | |
2371 | if (session->kernel_session) { | |
2372 | for (i = 0; i < nb_uri; i++) { | |
2373 | ret = add_uri_to_consumer( | |
2374 | session->kernel_session->consumer, | |
2375 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2376 | session->name); | |
2377 | if (ret != LTTNG_OK) { | |
2378 | goto error; | |
2379 | } | |
2380 | } | |
2381 | } | |
2382 | ||
7ab70fe0 DG |
2383 | /* |
2384 | * Make sure to set the session in output mode after we set URI since a | |
2385 | * session can be created without URL (thus flagged in no output mode). | |
2386 | */ | |
2387 | session->output_traces = 1; | |
2388 | if (ksess) { | |
2389 | ksess->output_traces = 1; | |
bda32d56 JG |
2390 | } |
2391 | ||
2392 | if (usess) { | |
7ab70fe0 DG |
2393 | usess->output_traces = 1; |
2394 | } | |
2395 | ||
2f77fc4b | 2396 | /* All good! */ |
f73fabfd | 2397 | ret = LTTNG_OK; |
2f77fc4b DG |
2398 | |
2399 | error: | |
2400 | return ret; | |
2401 | } | |
2402 | ||
2403 | /* | |
2404 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2405 | */ | |
2406 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2407 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2408 | { |
2409 | int ret; | |
2f77fc4b DG |
2410 | struct ltt_session *session; |
2411 | ||
2412 | assert(name); | |
2bba9e53 | 2413 | assert(creds); |
785d2d0d | 2414 | |
2f77fc4b DG |
2415 | /* |
2416 | * Verify if the session already exist | |
2417 | * | |
2418 | * XXX: There is no need for the session lock list here since the caller | |
2419 | * (process_client_msg) is holding it. We might want to change that so a | |
2420 | * single command does not lock the entire session list. | |
2421 | */ | |
2422 | session = session_find_by_name(name); | |
2423 | if (session != NULL) { | |
f73fabfd | 2424 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2425 | goto find_error; |
2426 | } | |
2427 | ||
2428 | /* Create tracing session in the registry */ | |
dec56f6c | 2429 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2430 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2431 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2432 | goto session_error; |
2433 | } | |
2434 | ||
2435 | /* | |
2436 | * Get the newly created session pointer back | |
2437 | * | |
2438 | * XXX: There is no need for the session lock list here since the caller | |
2439 | * (process_client_msg) is holding it. We might want to change that so a | |
2440 | * single command does not lock the entire session list. | |
2441 | */ | |
2442 | session = session_find_by_name(name); | |
2443 | assert(session); | |
2444 | ||
ecc48a90 | 2445 | session->live_timer = live_timer; |
2f77fc4b DG |
2446 | /* Create default consumer output for the session not yet created. */ |
2447 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2448 | if (session->consumer == NULL) { | |
f73fabfd | 2449 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2450 | goto consumer_error; |
2451 | } | |
2452 | ||
2bba9e53 | 2453 | if (uris) { |
bda32d56 | 2454 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2455 | if (ret != LTTNG_OK) { |
2456 | goto consumer_error; | |
2457 | } | |
2458 | session->output_traces = 1; | |
2459 | } else { | |
2460 | session->output_traces = 0; | |
2461 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2462 | } |
2463 | ||
2464 | session->consumer->enabled = 1; | |
2465 | ||
f73fabfd | 2466 | return LTTNG_OK; |
2f77fc4b DG |
2467 | |
2468 | consumer_error: | |
2469 | session_destroy(session); | |
2470 | session_error: | |
2471 | find_error: | |
2472 | return ret; | |
2473 | } | |
2474 | ||
27babd3a DG |
2475 | /* |
2476 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2477 | */ | |
2478 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2479 | size_t nb_uri, lttng_sock_cred *creds) | |
2480 | { | |
2481 | int ret; | |
2482 | struct ltt_session *session; | |
2483 | struct snapshot_output *new_output = NULL; | |
2484 | ||
2485 | assert(name); | |
2486 | assert(creds); | |
2487 | ||
2488 | /* | |
2489 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2490 | * received are for a default snapshot output if one. | |
2491 | */ | |
ae58b817 | 2492 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2493 | if (ret != LTTNG_OK) { |
2494 | goto error; | |
2495 | } | |
2496 | ||
2497 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2498 | session = session_find_by_name(name); | |
2499 | assert(session); | |
2500 | ||
2501 | /* Flag session for snapshot mode. */ | |
2502 | session->snapshot_mode = 1; | |
2503 | ||
2504 | /* Skip snapshot output creation if no URI is given. */ | |
2505 | if (nb_uri == 0) { | |
2506 | goto end; | |
2507 | } | |
2508 | ||
2509 | new_output = snapshot_output_alloc(); | |
2510 | if (!new_output) { | |
2511 | ret = LTTNG_ERR_NOMEM; | |
2512 | goto error_snapshot_alloc; | |
2513 | } | |
2514 | ||
2515 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2516 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2517 | if (ret < 0) { | |
2518 | if (ret == -ENOMEM) { | |
2519 | ret = LTTNG_ERR_NOMEM; | |
2520 | } else { | |
2521 | ret = LTTNG_ERR_INVALID; | |
2522 | } | |
2523 | goto error_snapshot; | |
2524 | } | |
2525 | ||
2526 | rcu_read_lock(); | |
2527 | snapshot_add_output(&session->snapshot, new_output); | |
2528 | rcu_read_unlock(); | |
2529 | ||
2530 | end: | |
2531 | return LTTNG_OK; | |
2532 | ||
2533 | error_snapshot: | |
2534 | snapshot_output_destroy(new_output); | |
2535 | error_snapshot_alloc: | |
2536 | session_destroy(session); | |
2537 | error: | |
2538 | return ret; | |
2539 | } | |
2540 | ||
2f77fc4b DG |
2541 | /* |
2542 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2543 | * |
2544 | * Called with session lock held. | |
2f77fc4b DG |
2545 | */ |
2546 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2547 | { | |
2548 | int ret; | |
2549 | struct ltt_ust_session *usess; | |
2550 | struct ltt_kernel_session *ksess; | |
2551 | ||
2552 | /* Safety net */ | |
2553 | assert(session); | |
2554 | ||
2555 | usess = session->ust_session; | |
2556 | ksess = session->kernel_session; | |
2557 | ||
2558 | /* Clean kernel session teardown */ | |
2559 | kernel_destroy_session(ksess); | |
2560 | ||
2561 | /* UST session teardown */ | |
2562 | if (usess) { | |
2563 | /* Close any relayd session */ | |
2564 | consumer_output_send_destroy_relayd(usess->consumer); | |
2565 | ||
2566 | /* Destroy every UST application related to this session. */ | |
2567 | ret = ust_app_destroy_trace_all(usess); | |
2568 | if (ret) { | |
2569 | ERR("Error in ust_app_destroy_trace_all"); | |
2570 | } | |
2571 | ||
2572 | /* Clean up the rest. */ | |
2573 | trace_ust_destroy_session(usess); | |
2574 | } | |
2575 | ||
2576 | /* | |
2577 | * Must notify the kernel thread here to update it's poll set in order to | |
2578 | * remove the channel(s)' fd just destroyed. | |
2579 | */ | |
2580 | ret = notify_thread_pipe(wpipe); | |
2581 | if (ret < 0) { | |
2582 | PERROR("write kernel poll pipe"); | |
2583 | } | |
2584 | ||
2585 | ret = session_destroy(session); | |
2586 | ||
2587 | return ret; | |
2588 | } | |
2589 | ||
2590 | /* | |
2591 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2592 | */ | |
56a37563 JG |
2593 | int cmd_calibrate(enum lttng_domain_type domain, |
2594 | struct lttng_calibrate *calibrate) | |
2f77fc4b DG |
2595 | { |
2596 | int ret; | |
2597 | ||
2598 | switch (domain) { | |
2599 | case LTTNG_DOMAIN_KERNEL: | |
2600 | { | |
2601 | struct lttng_kernel_calibrate kcalibrate; | |
2602 | ||
2e84128e DG |
2603 | switch (calibrate->type) { |
2604 | case LTTNG_CALIBRATE_FUNCTION: | |
2605 | default: | |
2606 | /* Default and only possible calibrate option. */ | |
2607 | kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE; | |
2608 | break; | |
2609 | } | |
2610 | ||
2f77fc4b DG |
2611 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); |
2612 | if (ret < 0) { | |
f73fabfd | 2613 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2f77fc4b DG |
2614 | goto error; |
2615 | } | |
2616 | break; | |
2617 | } | |
2618 | case LTTNG_DOMAIN_UST: | |
2619 | { | |
2620 | struct lttng_ust_calibrate ucalibrate; | |
2621 | ||
2e84128e DG |
2622 | switch (calibrate->type) { |
2623 | case LTTNG_CALIBRATE_FUNCTION: | |
2624 | default: | |
2625 | /* Default and only possible calibrate option. */ | |
2626 | ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT; | |
2627 | break; | |
2628 | } | |
2629 | ||
2f77fc4b DG |
2630 | ret = ust_app_calibrate_glb(&ucalibrate); |
2631 | if (ret < 0) { | |
f73fabfd | 2632 | ret = LTTNG_ERR_UST_CALIBRATE_FAIL; |
2f77fc4b DG |
2633 | goto error; |
2634 | } | |
2635 | break; | |
2636 | } | |
2637 | default: | |
f73fabfd | 2638 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2639 | goto error; |
2640 | } | |
2641 | ||
f73fabfd | 2642 | ret = LTTNG_OK; |
2f77fc4b DG |
2643 | |
2644 | error: | |
2645 | return ret; | |
2646 | } | |
2647 | ||
2648 | /* | |
2649 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2650 | */ | |
56a37563 JG |
2651 | int cmd_register_consumer(struct ltt_session *session, |
2652 | enum lttng_domain_type domain, const char *sock_path, | |
2653 | struct consumer_data *cdata) | |
2f77fc4b DG |
2654 | { |
2655 | int ret, sock; | |
dd81b457 | 2656 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2657 | |
2658 | assert(session); | |
2659 | assert(cdata); | |
2660 | assert(sock_path); | |
2661 | ||
2662 | switch (domain) { | |
2663 | case LTTNG_DOMAIN_KERNEL: | |
2664 | { | |
2665 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2666 | ||
2667 | assert(ksess); | |
2668 | ||
2669 | /* Can't register a consumer if there is already one */ | |
2670 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2671 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2672 | goto error; |
2673 | } | |
2674 | ||
2675 | sock = lttcomm_connect_unix_sock(sock_path); | |
2676 | if (sock < 0) { | |
f73fabfd | 2677 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2678 | goto error; |
2679 | } | |
4ce514c4 | 2680 | cdata->cmd_sock = sock; |
2f77fc4b | 2681 | |
4ce514c4 | 2682 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2683 | if (socket == NULL) { |
f66c074c DG |
2684 | ret = close(sock); |
2685 | if (ret < 0) { | |
2686 | PERROR("close register consumer"); | |
2687 | } | |
4ce514c4 | 2688 | cdata->cmd_sock = -1; |
f73fabfd | 2689 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2690 | goto error; |
2691 | } | |
2692 | ||
2693 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2694 | if (socket->lock == NULL) { | |
2695 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2696 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2697 | goto error; |
2698 | } | |
2699 | pthread_mutex_init(socket->lock, NULL); | |
2700 | socket->registered = 1; | |
2701 | ||
2702 | rcu_read_lock(); | |
2703 | consumer_add_socket(socket, ksess->consumer); | |
2704 | rcu_read_unlock(); | |
2705 | ||
2706 | pthread_mutex_lock(&cdata->pid_mutex); | |
2707 | cdata->pid = -1; | |
2708 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2709 | ||
2710 | break; | |
2711 | } | |
2712 | default: | |
2713 | /* TODO: Userspace tracing */ | |
f73fabfd | 2714 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2715 | goto error; |
2716 | } | |
2717 | ||
dd81b457 | 2718 | return LTTNG_OK; |
2f77fc4b DG |
2719 | |
2720 | error: | |
dd81b457 DG |
2721 | if (socket) { |
2722 | consumer_destroy_socket(socket); | |
2723 | } | |
2f77fc4b DG |
2724 | return ret; |
2725 | } | |
2726 | ||
2727 | /* | |
2728 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2729 | */ | |
2730 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2731 | struct lttng_domain **domains) | |
2732 | { | |
2733 | int ret, index = 0; | |
2734 | ssize_t nb_dom = 0; | |
fefd409b DG |
2735 | struct agent *agt; |
2736 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2737 | |
2738 | if (session->kernel_session != NULL) { | |
2739 | DBG3("Listing domains found kernel domain"); | |
2740 | nb_dom++; | |
2741 | } | |
2742 | ||
2743 | if (session->ust_session != NULL) { | |
2744 | DBG3("Listing domains found UST global domain"); | |
2745 | nb_dom++; | |
3c6a091f | 2746 | |
e0a74f01 | 2747 | rcu_read_lock(); |
fefd409b DG |
2748 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2749 | agt, node.node) { | |
2750 | if (agt->being_used) { | |
2751 | nb_dom++; | |
2752 | } | |
3c6a091f | 2753 | } |
e0a74f01 | 2754 | rcu_read_unlock(); |
2f77fc4b DG |
2755 | } |
2756 | ||
fa64dfb4 JG |
2757 | if (!nb_dom) { |
2758 | goto end; | |
2759 | } | |
2760 | ||
2f77fc4b DG |
2761 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2762 | if (*domains == NULL) { | |
f73fabfd | 2763 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2764 | goto error; |
2765 | } | |
2766 | ||
2767 | if (session->kernel_session != NULL) { | |
2768 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
2769 | |
2770 | /* Kernel session buffer type is always GLOBAL */ | |
2771 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2772 | ||
2f77fc4b DG |
2773 | index++; |
2774 | } | |
2775 | ||
2776 | if (session->ust_session != NULL) { | |
2777 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2778 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2779 | index++; |
3c6a091f | 2780 | |
e0a74f01 | 2781 | rcu_read_lock(); |
fefd409b DG |
2782 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2783 | agt, node.node) { | |
2784 | if (agt->being_used) { | |
2785 | (*domains)[index].type = agt->domain; | |
2786 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2787 | index++; | |
2788 | } | |
3c6a091f | 2789 | } |
e0a74f01 | 2790 | rcu_read_unlock(); |
2f77fc4b | 2791 | } |
fa64dfb4 | 2792 | end: |
2f77fc4b DG |
2793 | return nb_dom; |
2794 | ||
2795 | error: | |
f73fabfd DG |
2796 | /* Return negative value to differentiate return code */ |
2797 | return -ret; | |
2f77fc4b DG |
2798 | } |
2799 | ||
2800 | ||
2801 | /* | |
2802 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2803 | */ | |
56a37563 JG |
2804 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
2805 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b DG |
2806 | { |
2807 | int ret; | |
2808 | ssize_t nb_chan = 0; | |
2809 | ||
2810 | switch (domain) { | |
2811 | case LTTNG_DOMAIN_KERNEL: | |
2812 | if (session->kernel_session != NULL) { | |
2813 | nb_chan = session->kernel_session->channel_count; | |
2814 | } | |
2815 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 DG |
2816 | if (nb_chan <= 0) { |
2817 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; | |
2818 | } | |
2f77fc4b DG |
2819 | break; |
2820 | case LTTNG_DOMAIN_UST: | |
2821 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2822 | rcu_read_lock(); |
2f77fc4b | 2823 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2824 | session->ust_session->domain_global.channels); |
2825 | rcu_read_unlock(); | |
2f77fc4b DG |
2826 | } |
2827 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2828 | if (nb_chan < 0) { |
c7d620a2 | 2829 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
ade7ce52 | 2830 | goto error; |
c7d620a2 | 2831 | } |
2f77fc4b DG |
2832 | break; |
2833 | default: | |
f73fabfd | 2834 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2835 | goto error; |
2836 | } | |
2837 | ||
2838 | if (nb_chan > 0) { | |
2839 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
2840 | if (*channels == NULL) { | |
f73fabfd | 2841 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2842 | goto error; |
2843 | } | |
2844 | ||
2845 | list_lttng_channels(domain, session, *channels); | |
2f77fc4b DG |
2846 | } |
2847 | ||
2848 | return nb_chan; | |
2849 | ||
2850 | error: | |
f73fabfd DG |
2851 | /* Return negative value to differentiate return code */ |
2852 | return -ret; | |
2f77fc4b DG |
2853 | } |
2854 | ||
2855 | /* | |
2856 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2857 | */ | |
56a37563 JG |
2858 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
2859 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 2860 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
2861 | { |
2862 | int ret = 0; | |
2863 | ssize_t nb_event = 0; | |
2864 | ||
2865 | switch (domain) { | |
2866 | case LTTNG_DOMAIN_KERNEL: | |
2867 | if (session->kernel_session != NULL) { | |
2868 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
2869 | session->kernel_session, events, |
2870 | total_size); | |
2f77fc4b DG |
2871 | } |
2872 | break; | |
2873 | case LTTNG_DOMAIN_UST: | |
2874 | { | |
2875 | if (session->ust_session != NULL) { | |
2876 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
2877 | &session->ust_session->domain_global, events, |
2878 | total_size); | |
2f77fc4b DG |
2879 | } |
2880 | break; | |
2881 | } | |
5cdb6027 | 2882 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2883 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2884 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 2885 | if (session->ust_session) { |
fefd409b DG |
2886 | struct lttng_ht_iter iter; |
2887 | struct agent *agt; | |
2888 | ||
b11feea5 | 2889 | rcu_read_lock(); |
fefd409b DG |
2890 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
2891 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
2892 | if (agt->domain == domain) { |
2893 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
2894 | agt, events, |
2895 | total_size); | |
1dfd9906 JG |
2896 | break; |
2897 | } | |
fefd409b | 2898 | } |
b11feea5 | 2899 | rcu_read_unlock(); |
3c6a091f DG |
2900 | } |
2901 | break; | |
2f77fc4b | 2902 | default: |
f73fabfd | 2903 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2904 | goto error; |
2905 | } | |
2906 | ||
f73fabfd | 2907 | return nb_event; |
2f77fc4b DG |
2908 | |
2909 | error: | |
f73fabfd DG |
2910 | /* Return negative value to differentiate return code */ |
2911 | return -ret; | |
2f77fc4b DG |
2912 | } |
2913 | ||
2914 | /* | |
2915 | * Using the session list, filled a lttng_session array to send back to the | |
2916 | * client for session listing. | |
2917 | * | |
2918 | * The session list lock MUST be acquired before calling this function. Use | |
2919 | * session_lock_list() and session_unlock_list(). | |
2920 | */ | |
2921 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
2922 | gid_t gid) | |
2923 | { | |
2924 | int ret; | |
2925 | unsigned int i = 0; | |
2926 | struct ltt_session *session; | |
2927 | struct ltt_session_list *list = session_get_list(); | |
2928 | ||
2929 | DBG("Getting all available session for UID %d GID %d", | |
2930 | uid, gid); | |
2931 | /* | |
2932 | * Iterate over session list and append data after the control struct in | |
2933 | * the buffer. | |
2934 | */ | |
2935 | cds_list_for_each_entry(session, &list->head, list) { | |
2936 | /* | |
2937 | * Only list the sessions the user can control. | |
2938 | */ | |
2939 | if (!session_access_ok(session, uid, gid)) { | |
2940 | continue; | |
2941 | } | |
2942 | ||
2943 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2944 | struct ltt_ust_session *usess = session->ust_session; | |
2945 | ||
2946 | if (session->consumer->type == CONSUMER_DST_NET || | |
2947 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
2948 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
2949 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 2950 | sizeof(sessions[i].path), session); |
2f77fc4b | 2951 | } else { |
dec56f6c | 2952 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
2953 | session->consumer->dst.trace_path); |
2954 | } | |
2955 | if (ret < 0) { | |
2956 | PERROR("snprintf session path"); | |
2957 | continue; | |
2958 | } | |
2959 | ||
2960 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
2961 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 2962 | sessions[i].enabled = session->active; |
2cbf8fed | 2963 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 2964 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
2965 | i++; |
2966 | } | |
2967 | } | |
2968 | ||
806e2684 | 2969 | /* |
6d805429 | 2970 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 2971 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 2972 | */ |
6d805429 | 2973 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
2974 | { |
2975 | int ret; | |
2976 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2977 | struct ltt_ust_session *usess = session->ust_session; | |
2978 | ||
2979 | assert(session); | |
2980 | ||
2981 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 2982 | if (session->active) { |
806e2684 DG |
2983 | ret = LTTNG_ERR_SESSION_STARTED; |
2984 | goto error; | |
3a89d11a DG |
2985 | } else { |
2986 | /* | |
2987 | * If stopped, just make sure we've started before else the above call | |
2988 | * will always send that there is data pending. | |
2989 | * | |
2990 | * The consumer assumes that when the data pending command is received, | |
2991 | * the trace has been started before or else no output data is written | |
2992 | * by the streams which is a condition for data pending. So, this is | |
2993 | * *VERY* important that we don't ask the consumer before a start | |
2994 | * trace. | |
2995 | */ | |
8382cf6f | 2996 | if (!session->has_been_started) { |
3a89d11a DG |
2997 | ret = 0; |
2998 | goto error; | |
2999 | } | |
806e2684 DG |
3000 | } |
3001 | ||
3002 | if (ksess && ksess->consumer) { | |
6d805429 DG |
3003 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3004 | if (ret == 1) { | |
806e2684 DG |
3005 | /* Data is still being extracted for the kernel. */ |
3006 | goto error; | |
3007 | } | |
3008 | } | |
3009 | ||
3010 | if (usess && usess->consumer) { | |
6d805429 DG |
3011 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3012 | if (ret == 1) { | |
806e2684 DG |
3013 | /* Data is still being extracted for the kernel. */ |
3014 | goto error; | |
3015 | } | |
3016 | } | |
3017 | ||
3018 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3019 | ret = 0; |
806e2684 DG |
3020 | |
3021 | error: | |
3022 | return ret; | |
3023 | } | |
3024 | ||
6dc3064a DG |
3025 | /* |
3026 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3027 | * | |
3028 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3029 | */ | |
3030 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3031 | struct lttng_snapshot_output *output, uint32_t *id) | |
3032 | { | |
3033 | int ret; | |
3034 | struct snapshot_output *new_output; | |
3035 | ||
3036 | assert(session); | |
3037 | assert(output); | |
3038 | ||
3039 | DBG("Cmd snapshot add output for session %s", session->name); | |
3040 | ||
3041 | /* | |
d3f14b8a MD |
3042 | * Permission denied to create an output if the session is not |
3043 | * set in no output mode. | |
6dc3064a DG |
3044 | */ |
3045 | if (session->output_traces) { | |
3046 | ret = LTTNG_ERR_EPERM; | |
3047 | goto error; | |
3048 | } | |
3049 | ||
3050 | /* Only one output is allowed until we have the "tee" feature. */ | |
3051 | if (session->snapshot.nb_output == 1) { | |
3052 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3053 | goto error; | |
3054 | } | |
3055 | ||
3056 | new_output = snapshot_output_alloc(); | |
3057 | if (!new_output) { | |
3058 | ret = LTTNG_ERR_NOMEM; | |
3059 | goto error; | |
3060 | } | |
3061 | ||
3062 | ret = snapshot_output_init(output->max_size, output->name, | |
3063 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
3064 | &session->snapshot); | |
3065 | if (ret < 0) { | |
3066 | if (ret == -ENOMEM) { | |
3067 | ret = LTTNG_ERR_NOMEM; | |
3068 | } else { | |
3069 | ret = LTTNG_ERR_INVALID; | |
3070 | } | |
3071 | goto free_error; | |
3072 | } | |
3073 | ||
6dc3064a DG |
3074 | rcu_read_lock(); |
3075 | snapshot_add_output(&session->snapshot, new_output); | |
3076 | if (id) { | |
3077 | *id = new_output->id; | |
3078 | } | |
3079 | rcu_read_unlock(); | |
3080 | ||
3081 | return LTTNG_OK; | |
3082 | ||
3083 | free_error: | |
3084 | snapshot_output_destroy(new_output); | |
3085 | error: | |
3086 | return ret; | |
3087 | } | |
3088 | ||
3089 | /* | |
3090 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3091 | * | |
3092 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3093 | */ | |
3094 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3095 | struct lttng_snapshot_output *output) | |
3096 | { | |
3097 | int ret; | |
eb240553 | 3098 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3099 | |
3100 | assert(session); | |
3101 | assert(output); | |
3102 | ||
6dc3064a DG |
3103 | rcu_read_lock(); |
3104 | ||
3105 | /* | |
d3f14b8a MD |
3106 | * Permission denied to create an output if the session is not |
3107 | * set in no output mode. | |
6dc3064a DG |
3108 | */ |
3109 | if (session->output_traces) { | |
3110 | ret = LTTNG_ERR_EPERM; | |
3111 | goto error; | |
3112 | } | |
3113 | ||
eb240553 DG |
3114 | if (output->id) { |
3115 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3116 | session->name); | |
3117 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3118 | } else if (*output->name != '\0') { | |
3119 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3120 | session->name); | |
3121 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3122 | } | |
6dc3064a DG |
3123 | if (!sout) { |
3124 | ret = LTTNG_ERR_INVALID; | |
3125 | goto error; | |
3126 | } | |
3127 | ||
3128 | snapshot_delete_output(&session->snapshot, sout); | |
3129 | snapshot_output_destroy(sout); | |
3130 | ret = LTTNG_OK; | |
3131 | ||
3132 | error: | |
3133 | rcu_read_unlock(); | |
3134 | return ret; | |
3135 | } | |
3136 | ||
3137 | /* | |
3138 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3139 | * | |
3140 | * If no output is available, outputs is untouched and 0 is returned. | |
3141 | * | |
3142 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3143 | */ | |
3144 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3145 | struct lttng_snapshot_output **outputs) | |
3146 | { | |
3147 | int ret, idx = 0; | |
b223ca94 | 3148 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3149 | struct lttng_ht_iter iter; |
3150 | struct snapshot_output *output; | |
3151 | ||
3152 | assert(session); | |
3153 | assert(outputs); | |
3154 | ||
3155 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3156 | ||
3157 | /* | |
d3f14b8a MD |
3158 | * Permission denied to create an output if the session is not |
3159 | * set in no output mode. | |
6dc3064a DG |
3160 | */ |
3161 | if (session->output_traces) { | |
b223ca94 | 3162 | ret = -LTTNG_ERR_EPERM; |
6dc3064a DG |
3163 | goto error; |
3164 | } | |
3165 | ||
3166 | if (session->snapshot.nb_output == 0) { | |
3167 | ret = 0; | |
3168 | goto error; | |
3169 | } | |
3170 | ||
3171 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3172 | if (!list) { | |
b223ca94 | 3173 | ret = -LTTNG_ERR_NOMEM; |
6dc3064a DG |
3174 | goto error; |
3175 | } | |
3176 | ||
3177 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3178 | rcu_read_lock(); |
6dc3064a DG |
3179 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3180 | output, node.node) { | |
3181 | assert(output->consumer); | |
3182 | list[idx].id = output->id; | |
3183 | list[idx].max_size = output->max_size; | |
3184 | strncpy(list[idx].name, output->name, sizeof(list[idx].name)); | |
3185 | if (output->consumer->type == CONSUMER_DST_LOCAL) { | |
3186 | strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path, | |
3187 | sizeof(list[idx].ctrl_url)); | |
3188 | } else { | |
3189 | /* Control URI. */ | |
3190 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3191 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3192 | if (ret < 0) { | |
b223ca94 JG |
3193 | ret = -LTTNG_ERR_NOMEM; |
3194 | goto error; | |
6dc3064a DG |
3195 | } |
3196 | ||
3197 | /* Data URI. */ | |
3198 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3199 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3200 | if (ret < 0) { | |
b223ca94 JG |
3201 | ret = -LTTNG_ERR_NOMEM; |
3202 | goto error; | |
6dc3064a DG |
3203 | } |
3204 | } | |
3205 | idx++; | |
3206 | } | |
3207 | ||
3208 | *outputs = list; | |
b223ca94 JG |
3209 | list = NULL; |
3210 | ret = session->snapshot.nb_output; | |
6dc3064a | 3211 | error: |
b223ca94 JG |
3212 | free(list); |
3213 | rcu_read_unlock(); | |
3214 | return ret; | |
6dc3064a DG |
3215 | } |
3216 | ||
3217 | /* | |
3218 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3219 | * snapshot output is *not* set with a remote destination. | |
3220 | * | |
a934f4af | 3221 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3222 | */ |
3223 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3224 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3225 | { | |
a934f4af | 3226 | int ret = LTTNG_OK; |
6dc3064a DG |
3227 | struct lttng_ht_iter iter; |
3228 | struct consumer_socket *socket; | |
3229 | ||
3230 | assert(consumer); | |
3231 | assert(snap_output); | |
3232 | assert(session); | |
3233 | ||
3234 | DBG2("Set relayd object from snapshot output"); | |
3235 | ||
3236 | /* Ignore if snapshot consumer output is not network. */ | |
3237 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3238 | goto error; | |
3239 | } | |
3240 | ||
3241 | /* | |
3242 | * For each consumer socket, create and send the relayd object of the | |
3243 | * snapshot output. | |
3244 | */ | |
3245 | rcu_read_lock(); | |
5eecee74 DG |
3246 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3247 | socket, node.node) { | |
6dc3064a | 3248 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3249 | snap_output->consumer, socket, |
3250 | session->name, session->hostname, | |
3251 | session->live_timer); | |
a934f4af | 3252 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3253 | rcu_read_unlock(); |
3254 | goto error; | |
3255 | } | |
3256 | } | |
3257 | rcu_read_unlock(); | |
3258 | ||
3259 | error: | |
3260 | return ret; | |
3261 | } | |
3262 | ||
3263 | /* | |
3264 | * Record a kernel snapshot. | |
3265 | * | |
fac41e72 | 3266 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3267 | */ |
3268 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3269 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3270 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3271 | { |
3272 | int ret; | |
3273 | ||
3274 | assert(ksess); | |
3275 | assert(output); | |
3276 | assert(session); | |
3277 | ||
10a50311 JD |
3278 | /* Get the datetime for the snapshot output directory. */ |
3279 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime, | |
3280 | sizeof(output->datetime)); | |
3281 | if (!ret) { | |
a934f4af | 3282 | ret = LTTNG_ERR_INVALID; |
10a50311 JD |
3283 | goto error; |
3284 | } | |
3285 | ||
af706bb7 DG |
3286 | /* |
3287 | * Copy kernel session sockets so we can communicate with the right | |
3288 | * consumer for the snapshot record command. | |
3289 | */ | |
3290 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3291 | if (ret < 0) { | |
a934f4af | 3292 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3293 | goto error; |
6dc3064a DG |
3294 | } |
3295 | ||
3296 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3297 | if (ret != LTTNG_OK) { |
af706bb7 | 3298 | goto error_snapshot; |
6dc3064a DG |
3299 | } |
3300 | ||
d07ceecd | 3301 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3302 | if (ret != LTTNG_OK) { |
af706bb7 | 3303 | goto error_snapshot; |
6dc3064a DG |
3304 | } |
3305 | ||
a934f4af | 3306 | ret = LTTNG_OK; |
1371fc12 | 3307 | goto end; |
a934f4af | 3308 | |
af706bb7 DG |
3309 | error_snapshot: |
3310 | /* Clean up copied sockets so this output can use some other later on. */ | |
3311 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3312 | error: |
1371fc12 | 3313 | end: |
6dc3064a DG |
3314 | return ret; |
3315 | } | |
3316 | ||
3317 | /* | |
3318 | * Record a UST snapshot. | |
3319 | * | |
a934f4af | 3320 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3321 | */ |
3322 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3323 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3324 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3325 | { |
3326 | int ret; | |
3327 | ||
3328 | assert(usess); | |
3329 | assert(output); | |
3330 | assert(session); | |
3331 | ||
10a50311 JD |
3332 | /* Get the datetime for the snapshot output directory. */ |
3333 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime, | |
3334 | sizeof(output->datetime)); | |
3335 | if (!ret) { | |
a934f4af | 3336 | ret = LTTNG_ERR_INVALID; |
10a50311 JD |
3337 | goto error; |
3338 | } | |
3339 | ||
af706bb7 | 3340 | /* |
d3f14b8a | 3341 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3342 | * consumer for the snapshot record command. |
3343 | */ | |
3344 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3345 | if (ret < 0) { | |
a934f4af | 3346 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3347 | goto error; |
6dc3064a DG |
3348 | } |
3349 | ||
3350 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3351 | if (ret != LTTNG_OK) { |
af706bb7 | 3352 | goto error_snapshot; |
6dc3064a DG |
3353 | } |
3354 | ||
d07ceecd | 3355 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3356 | if (ret < 0) { |
7badf927 DG |
3357 | switch (-ret) { |
3358 | case EINVAL: | |
a934f4af | 3359 | ret = LTTNG_ERR_INVALID; |
7badf927 DG |
3360 | break; |
3361 | case ENODATA: | |
3362 | ret = LTTNG_ERR_SNAPSHOT_NODATA; | |
3363 | break; | |
3364 | default: | |
3365 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3366 | break; | |
5c786ded | 3367 | } |
af706bb7 | 3368 | goto error_snapshot; |
6dc3064a DG |
3369 | } |
3370 | ||
a934f4af DG |
3371 | ret = LTTNG_OK; |
3372 | ||
af706bb7 DG |
3373 | error_snapshot: |
3374 | /* Clean up copied sockets so this output can use some other later on. */ | |
3375 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3376 | error: |
3377 | return ret; | |
3378 | } | |
3379 | ||
d07ceecd MD |
3380 | static |
3381 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3382 | uint64_t cur_nr_packets) | |
68808f4e | 3383 | { |
d07ceecd | 3384 | uint64_t tot_size = 0; |
68808f4e DG |
3385 | |
3386 | if (session->kernel_session) { | |
3387 | struct ltt_kernel_channel *chan; | |
3388 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3389 | ||
68808f4e | 3390 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3391 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3392 | /* | |
3393 | * Don't take channel into account if we | |
3394 | * already grab all its packets. | |
3395 | */ | |
3396 | continue; | |
68808f4e | 3397 | } |
d07ceecd MD |
3398 | tot_size += chan->channel->attr.subbuf_size |
3399 | * chan->stream_count; | |
68808f4e DG |
3400 | } |
3401 | } | |
3402 | ||
3403 | if (session->ust_session) { | |
68808f4e DG |
3404 | struct ltt_ust_session *usess = session->ust_session; |
3405 | ||
d07ceecd MD |
3406 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3407 | cur_nr_packets); | |
68808f4e DG |
3408 | } |
3409 | ||
d07ceecd | 3410 | return tot_size; |
68808f4e DG |
3411 | } |
3412 | ||
5c786ded | 3413 | /* |
d07ceecd MD |
3414 | * Calculate the number of packets we can grab from each stream that |
3415 | * fits within the overall snapshot max size. | |
3416 | * | |
3417 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3418 | * the number of packets per stream. | |
3419 | * | |
3420 | * TODO: this approach is not perfect: we consider the worse case | |
3421 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3422 | * better if we do this calculation while we actually grab the packet | |
3423 | * content: we would know how much padding we don't actually store into | |
3424 | * the file. | |
3425 | * | |
3426 | * This algorithm is currently bounded by the number of packets per | |
3427 | * stream. | |
3428 | * | |
3429 | * Since we call this algorithm before actually grabbing the data, it's | |
3430 | * an approximation: for instance, applications could appear/disappear | |
3431 | * in between this call and actually grabbing data. | |
5c786ded | 3432 | */ |
d07ceecd MD |
3433 | static |
3434 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3435 | { |
d07ceecd MD |
3436 | int64_t size_left; |
3437 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3438 | |
d07ceecd MD |
3439 | if (!max_size) { |
3440 | return 0; /* Infinite */ | |
5c786ded JD |
3441 | } |
3442 | ||
d07ceecd MD |
3443 | size_left = max_size; |
3444 | for (;;) { | |
3445 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3446 | |
d07ceecd MD |
3447 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3448 | cur_nb_packets); | |
3449 | if (!one_more_packet_tot_size) { | |
3450 | /* We are already grabbing all packets. */ | |
3451 | break; | |
3452 | } | |
3453 | size_left -= one_more_packet_tot_size; | |
3454 | if (size_left < 0) { | |
3455 | break; | |
3456 | } | |
3457 | cur_nb_packets++; | |
5c786ded | 3458 | } |
d07ceecd MD |
3459 | if (!cur_nb_packets) { |
3460 | /* Not enough room to grab one packet of each stream, error. */ | |
3461 | return -1; | |
3462 | } | |
3463 | return cur_nb_packets; | |
5c786ded JD |
3464 | } |
3465 | ||
6dc3064a DG |
3466 | /* |
3467 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3468 | * | |
3469 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3470 | * complete before returning. | |
3471 | * | |
3472 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3473 | */ | |
3474 | int cmd_snapshot_record(struct ltt_session *session, | |
3475 | struct lttng_snapshot_output *output, int wait) | |
3476 | { | |
3477 | int ret = LTTNG_OK; | |
e1986656 DG |
3478 | unsigned int use_tmp_output = 0; |
3479 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3480 | unsigned int snapshot_success = 0; |
6dc3064a DG |
3481 | |
3482 | assert(session); | |
ba45d9f0 | 3483 | assert(output); |
6dc3064a DG |
3484 | |
3485 | DBG("Cmd snapshot record for session %s", session->name); | |
3486 | ||
3487 | /* | |
d3f14b8a MD |
3488 | * Permission denied to create an output if the session is not |
3489 | * set in no output mode. | |
6dc3064a DG |
3490 | */ |
3491 | if (session->output_traces) { | |
3492 | ret = LTTNG_ERR_EPERM; | |
3493 | goto error; | |
3494 | } | |
3495 | ||
3496 | /* The session needs to be started at least once. */ | |
8382cf6f | 3497 | if (!session->has_been_started) { |
6dc3064a DG |
3498 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3499 | goto error; | |
3500 | } | |
3501 | ||
3502 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3503 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3504 | ret = snapshot_output_init(output->max_size, output->name, |
3505 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3506 | &tmp_output, NULL); |
6dc3064a DG |
3507 | if (ret < 0) { |
3508 | if (ret == -ENOMEM) { | |
3509 | ret = LTTNG_ERR_NOMEM; | |
3510 | } else { | |
3511 | ret = LTTNG_ERR_INVALID; | |
3512 | } | |
3513 | goto error; | |
3514 | } | |
1bfe7328 DG |
3515 | /* Use the global session count for the temporary snapshot. */ |
3516 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
e1986656 | 3517 | use_tmp_output = 1; |
6dc3064a DG |
3518 | } |
3519 | ||
3520 | if (session->kernel_session) { | |
3521 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3522 | ||
e1986656 | 3523 | if (use_tmp_output) { |
d07ceecd MD |
3524 | int64_t nb_packets_per_stream; |
3525 | ||
3526 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3527 | tmp_output.max_size); | |
3528 | if (nb_packets_per_stream < 0) { | |
3529 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3530 | goto error; | |
3531 | } | |
e1986656 | 3532 | ret = record_kernel_snapshot(ksess, &tmp_output, session, |
d07ceecd | 3533 | wait, nb_packets_per_stream); |
a934f4af | 3534 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3535 | goto error; |
3536 | } | |
1bfe7328 | 3537 | snapshot_success = 1; |
6dc3064a DG |
3538 | } else { |
3539 | struct snapshot_output *sout; | |
3540 | struct lttng_ht_iter iter; | |
3541 | ||
3542 | rcu_read_lock(); | |
3543 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3544 | &iter.iter, sout, node.node) { | |
d07ceecd MD |
3545 | int64_t nb_packets_per_stream; |
3546 | ||
e1986656 DG |
3547 | /* |
3548 | * Make a local copy of the output and assign the possible | |
3549 | * temporary value given by the caller. | |
3550 | */ | |
3551 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3552 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
3553 | ||
e1986656 DG |
3554 | if (output->max_size != (uint64_t) -1ULL) { |
3555 | tmp_output.max_size = output->max_size; | |
3556 | } | |
3557 | ||
d07ceecd MD |
3558 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3559 | tmp_output.max_size); | |
3560 | if (nb_packets_per_stream < 0) { | |
68808f4e DG |
3561 | ret = LTTNG_ERR_MAX_SIZE_INVALID; |
3562 | goto error; | |
3563 | } | |
3564 | ||
e1986656 DG |
3565 | /* Use temporary name. */ |
3566 | if (*output->name != '\0') { | |
3567 | strncpy(tmp_output.name, output->name, | |
3568 | sizeof(tmp_output.name)); | |
3569 | } | |
3570 | ||
1bfe7328 DG |
3571 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
3572 | ||
e1986656 | 3573 | ret = record_kernel_snapshot(ksess, &tmp_output, |
d07ceecd | 3574 | session, wait, nb_packets_per_stream); |
a934f4af | 3575 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3576 | rcu_read_unlock(); |
3577 | goto error; | |
3578 | } | |
1bfe7328 | 3579 | snapshot_success = 1; |
6dc3064a DG |
3580 | } |
3581 | rcu_read_unlock(); | |
3582 | } | |
3583 | } | |
3584 | ||
3585 | if (session->ust_session) { | |
3586 | struct ltt_ust_session *usess = session->ust_session; | |
3587 | ||
e1986656 | 3588 | if (use_tmp_output) { |
d07ceecd MD |
3589 | int64_t nb_packets_per_stream; |
3590 | ||
3591 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3592 | tmp_output.max_size); | |
3593 | if (nb_packets_per_stream < 0) { | |
3594 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3595 | goto error; | |
3596 | } | |
e1986656 | 3597 | ret = record_ust_snapshot(usess, &tmp_output, session, |
d07ceecd | 3598 | wait, nb_packets_per_stream); |
a934f4af | 3599 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3600 | goto error; |
3601 | } | |
1bfe7328 | 3602 | snapshot_success = 1; |
6dc3064a DG |
3603 | } else { |
3604 | struct snapshot_output *sout; | |
3605 | struct lttng_ht_iter iter; | |
3606 | ||
3607 | rcu_read_lock(); | |
3608 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3609 | &iter.iter, sout, node.node) { | |
d07ceecd MD |
3610 | int64_t nb_packets_per_stream; |
3611 | ||
e1986656 DG |
3612 | /* |
3613 | * Make a local copy of the output and assign the possible | |
3614 | * temporary value given by the caller. | |
3615 | */ | |
3616 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3617 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
3618 | ||
e1986656 DG |
3619 | if (output->max_size != (uint64_t) -1ULL) { |
3620 | tmp_output.max_size = output->max_size; | |
3621 | } | |
3622 | ||
d07ceecd MD |
3623 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3624 | tmp_output.max_size); | |
3625 | if (nb_packets_per_stream < 0) { | |
68808f4e | 3626 | ret = LTTNG_ERR_MAX_SIZE_INVALID; |
d07ceecd | 3627 | rcu_read_unlock(); |
68808f4e DG |
3628 | goto error; |
3629 | } | |
3630 | ||
e1986656 DG |
3631 | /* Use temporary name. */ |
3632 | if (*output->name != '\0') { | |
3633 | strncpy(tmp_output.name, output->name, | |
3634 | sizeof(tmp_output.name)); | |
3635 | } | |
3636 | ||
1bfe7328 DG |
3637 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
3638 | ||
e1986656 | 3639 | ret = record_ust_snapshot(usess, &tmp_output, session, |
d07ceecd | 3640 | wait, nb_packets_per_stream); |
a934f4af | 3641 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3642 | rcu_read_unlock(); |
3643 | goto error; | |
3644 | } | |
1bfe7328 | 3645 | snapshot_success = 1; |
6dc3064a DG |
3646 | } |
3647 | rcu_read_unlock(); | |
3648 | } | |
3649 | } | |
3650 | ||
1bfe7328 DG |
3651 | if (snapshot_success) { |
3652 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
3653 | } else { |
3654 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
3655 | } |
3656 | ||
6dc3064a | 3657 | error: |
6dc3064a DG |
3658 | return ret; |
3659 | } | |
3660 | ||
d7ba1388 MD |
3661 | /* |
3662 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
3663 | */ | |
3664 | int cmd_set_session_shm_path(struct ltt_session *session, | |
3665 | const char *shm_path) | |
3666 | { | |
3667 | /* Safety net */ | |
3668 | assert(session); | |
3669 | ||
3670 | /* | |
3671 | * Can only set shm path before session is started. | |
3672 | */ | |
3673 | if (session->has_been_started) { | |
3674 | return LTTNG_ERR_SESSION_STARTED; | |
3675 | } | |
3676 | ||
3677 | strncpy(session->shm_path, shm_path, | |
3678 | sizeof(session->shm_path)); | |
3679 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
3680 | ||
3681 | return 0; | |
3682 | } | |
3683 | ||
2f77fc4b DG |
3684 | /* |
3685 | * Init command subsystem. | |
3686 | */ | |
3687 | void cmd_init(void) | |
3688 | { | |
3689 | /* | |
d88aee68 DG |
3690 | * Set network sequence index to 1 for streams to match a relayd |
3691 | * socket on the consumer side. | |
2f77fc4b | 3692 | */ |
d88aee68 DG |
3693 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
3694 | relayd_net_seq_idx = 1; | |
3695 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
3696 | |
3697 | DBG("Command subsystem initialized"); | |
3698 | } |