Commit | Line | Data |
---|---|---|
54012638 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
54012638 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
54012638 DG |
16 | */ |
17 | ||
6c1c0768 | 18 | #define _LGPL_SOURCE |
54012638 DG |
19 | #include <stdio.h> |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
c363b55d | 22 | #include <unistd.h> |
54012638 | 23 | |
dcabc190 FD |
24 | #include <lttng/event.h> |
25 | #include <lttng/lttng-error.h> | |
26 | #include <lttng/userspace-probe.h> | |
27 | #include <lttng/userspace-probe-internal.h> | |
28 | ||
990570ed DG |
29 | #include <common/common.h> |
30 | #include <common/defaults.h> | |
82b69413 | 31 | #include <common/trace-chunk.h> |
1e307fab | 32 | |
00e2e675 | 33 | #include "consumer.h" |
62499ad6 | 34 | #include "trace-kernel.h" |
e9404c27 JG |
35 | #include "lttng-sessiond.h" |
36 | #include "notification-thread-commands.h" | |
54012638 | 37 | |
19e70852 | 38 | /* |
050349bb | 39 | * Find the channel name for the given kernel session. |
19e70852 | 40 | */ |
62499ad6 | 41 | struct ltt_kernel_channel *trace_kernel_get_channel_by_name( |
df4f5a87 | 42 | const char *name, struct ltt_kernel_session *session) |
19e70852 DG |
43 | { |
44 | struct ltt_kernel_channel *chan; | |
45 | ||
0525e9ae DG |
46 | assert(session); |
47 | assert(name); | |
19e70852 | 48 | |
85076754 MD |
49 | /* |
50 | * If we receive an empty string for channel name, it means the | |
51 | * default channel name is requested. | |
52 | */ | |
53 | if (name[0] == '\0') | |
54 | name = DEFAULT_CHANNEL_NAME; | |
55 | ||
54d01ffb DG |
56 | DBG("Trying to find channel %s", name); |
57 | ||
19e70852 DG |
58 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
59 | if (strcmp(name, chan->channel->name) == 0) { | |
60 | DBG("Found channel by name %s", name); | |
61 | return chan; | |
62 | } | |
63 | } | |
64 | ||
19e70852 DG |
65 | return NULL; |
66 | } | |
67 | ||
00a62084 MD |
68 | /* |
69 | * Find the event for the given channel. | |
70 | */ | |
71 | struct ltt_kernel_event *trace_kernel_find_event( | |
72 | char *name, struct ltt_kernel_channel *channel, | |
73 | enum lttng_event_type type, | |
74 | struct lttng_filter_bytecode *filter) | |
75 | { | |
76 | struct ltt_kernel_event *ev; | |
77 | int found = 0; | |
78 | ||
79 | assert(name); | |
80 | assert(channel); | |
81 | ||
82 | cds_list_for_each_entry(ev, &channel->events_list.head, list) { | |
83 | if (type != LTTNG_EVENT_ALL && ev->type != type) { | |
84 | continue; | |
85 | } | |
86 | if (strcmp(name, ev->event->name)) { | |
87 | continue; | |
88 | } | |
89 | if ((ev->filter && !filter) || (!ev->filter && filter)) { | |
90 | continue; | |
91 | } | |
92 | if (ev->filter && filter) { | |
93 | if (ev->filter->len != filter->len || | |
94 | memcmp(ev->filter->data, filter->data, | |
95 | filter->len) != 0) { | |
96 | continue; | |
97 | } | |
98 | } | |
99 | found = 1; | |
100 | break; | |
101 | } | |
102 | if (found) { | |
103 | DBG("Found event %s for channel %s", name, | |
104 | channel->channel->name); | |
105 | return ev; | |
106 | } else { | |
107 | return NULL; | |
108 | } | |
109 | } | |
110 | ||
19e70852 | 111 | /* |
050349bb | 112 | * Find the event name for the given channel. |
19e70852 | 113 | */ |
62499ad6 | 114 | struct ltt_kernel_event *trace_kernel_get_event_by_name( |
d0ae4ea8 MD |
115 | char *name, struct ltt_kernel_channel *channel, |
116 | enum lttng_event_type type) | |
19e70852 DG |
117 | { |
118 | struct ltt_kernel_event *ev; | |
00a62084 | 119 | int found = 0; |
19e70852 | 120 | |
0525e9ae DG |
121 | assert(name); |
122 | assert(channel); | |
19e70852 DG |
123 | |
124 | cds_list_for_each_entry(ev, &channel->events_list.head, list) { | |
00a62084 | 125 | if (type != LTTNG_EVENT_ALL && ev->type != type) { |
d0ae4ea8 | 126 | continue; |
19e70852 | 127 | } |
00a62084 MD |
128 | if (strcmp(name, ev->event->name)) { |
129 | continue; | |
130 | } | |
131 | found = 1; | |
132 | break; | |
133 | } | |
134 | if (found) { | |
135 | DBG("Found event %s for channel %s", name, | |
136 | channel->channel->name); | |
137 | return ev; | |
138 | } else { | |
139 | return NULL; | |
19e70852 | 140 | } |
19e70852 DG |
141 | } |
142 | ||
54012638 | 143 | /* |
050349bb | 144 | * Allocate and initialize a kernel session data structure. |
54012638 | 145 | * |
050349bb | 146 | * Return pointer to structure or NULL. |
54012638 | 147 | */ |
dec56f6c | 148 | struct ltt_kernel_session *trace_kernel_create_session(void) |
54012638 | 149 | { |
a4b92340 | 150 | struct ltt_kernel_session *lks = NULL; |
54012638 DG |
151 | |
152 | /* Allocate a new ltt kernel session */ | |
ba7f0ae5 | 153 | lks = zmalloc(sizeof(struct ltt_kernel_session)); |
54012638 | 154 | if (lks == NULL) { |
df0f840b | 155 | PERROR("create kernel session zmalloc"); |
a4b92340 | 156 | goto alloc_error; |
54012638 DG |
157 | } |
158 | ||
159 | /* Init data structure */ | |
03550b58 MD |
160 | lks->fd = -1; |
161 | lks->metadata_stream_fd = -1; | |
54012638 DG |
162 | lks->channel_count = 0; |
163 | lks->stream_count_global = 0; | |
164 | lks->metadata = NULL; | |
165 | CDS_INIT_LIST_HEAD(&lks->channel_list.head); | |
166 | ||
55c9e7ca JR |
167 | lks->tracker_list_pid = lttng_tracker_list_create(); |
168 | if (!lks->tracker_list_pid) { | |
169 | goto error; | |
170 | } | |
171 | lks->tracker_list_vpid = lttng_tracker_list_create(); | |
172 | if (!lks->tracker_list_vpid) { | |
173 | goto error; | |
174 | } | |
175 | lks->tracker_list_uid = lttng_tracker_list_create(); | |
176 | if (!lks->tracker_list_uid) { | |
177 | goto error; | |
178 | } | |
179 | lks->tracker_list_vuid = lttng_tracker_list_create(); | |
180 | if (!lks->tracker_list_vuid) { | |
181 | goto error; | |
182 | } | |
183 | lks->tracker_list_gid = lttng_tracker_list_create(); | |
184 | if (!lks->tracker_list_gid) { | |
185 | goto error; | |
186 | } | |
187 | lks->tracker_list_vgid = lttng_tracker_list_create(); | |
188 | if (!lks->tracker_list_vgid) { | |
189 | goto error; | |
190 | } | |
00e2e675 DG |
191 | lks->consumer = consumer_create_output(CONSUMER_DST_LOCAL); |
192 | if (lks->consumer == NULL) { | |
193 | goto error; | |
194 | } | |
195 | ||
54012638 DG |
196 | return lks; |
197 | ||
198 | error: | |
55c9e7ca JR |
199 | lttng_tracker_list_destroy(lks->tracker_list_pid); |
200 | lttng_tracker_list_destroy(lks->tracker_list_vpid); | |
201 | lttng_tracker_list_destroy(lks->tracker_list_uid); | |
202 | lttng_tracker_list_destroy(lks->tracker_list_vuid); | |
203 | lttng_tracker_list_destroy(lks->tracker_list_gid); | |
204 | lttng_tracker_list_destroy(lks->tracker_list_vgid); | |
a4b92340 DG |
205 | free(lks); |
206 | ||
207 | alloc_error: | |
54012638 DG |
208 | return NULL; |
209 | } | |
210 | ||
211 | /* | |
050349bb | 212 | * Allocate and initialize a kernel channel data structure. |
54012638 | 213 | * |
050349bb | 214 | * Return pointer to structure or NULL. |
54012638 | 215 | */ |
00e2e675 | 216 | struct ltt_kernel_channel *trace_kernel_create_channel( |
fdd9eb17 | 217 | struct lttng_channel *chan) |
54012638 | 218 | { |
54012638 | 219 | struct ltt_kernel_channel *lkc; |
61a5b6b1 | 220 | struct lttng_channel_extended *extended = NULL; |
54012638 | 221 | |
0525e9ae DG |
222 | assert(chan); |
223 | ||
ba7f0ae5 | 224 | lkc = zmalloc(sizeof(struct ltt_kernel_channel)); |
f3ed775e | 225 | if (lkc == NULL) { |
df0f840b | 226 | PERROR("ltt_kernel_channel zmalloc"); |
54012638 DG |
227 | goto error; |
228 | } | |
229 | ||
ba7f0ae5 | 230 | lkc->channel = zmalloc(sizeof(struct lttng_channel)); |
f3ed775e | 231 | if (lkc->channel == NULL) { |
df0f840b | 232 | PERROR("lttng_channel zmalloc"); |
e9404c27 JG |
233 | goto error; |
234 | } | |
235 | ||
236 | extended = zmalloc(sizeof(struct lttng_channel_extended)); | |
237 | if (!extended) { | |
238 | PERROR("lttng_channel_channel zmalloc"); | |
f3ed775e DG |
239 | goto error; |
240 | } | |
241 | memcpy(lkc->channel, chan, sizeof(struct lttng_channel)); | |
e9404c27 JG |
242 | memcpy(extended, chan->attr.extended.ptr, sizeof(struct lttng_channel_extended)); |
243 | lkc->channel->attr.extended.ptr = extended; | |
244 | extended = NULL; | |
54012638 | 245 | |
85076754 MD |
246 | /* |
247 | * If we receive an empty string for channel name, it means the | |
248 | * default channel name is requested. | |
249 | */ | |
250 | if (chan->name[0] == '\0') { | |
251 | strncpy(lkc->channel->name, DEFAULT_CHANNEL_NAME, | |
252 | sizeof(lkc->channel->name)); | |
253 | } | |
bd722d76 | 254 | lkc->channel->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
85076754 | 255 | |
03550b58 | 256 | lkc->fd = -1; |
54012638 | 257 | lkc->stream_count = 0; |
cbbbb275 | 258 | lkc->event_count = 0; |
d36b8583 | 259 | lkc->enabled = 1; |
753873bf | 260 | lkc->published_to_notification_thread = false; |
54012638 DG |
261 | /* Init linked list */ |
262 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); | |
263 | CDS_INIT_LIST_HEAD(&lkc->stream_list.head); | |
645328ae | 264 | CDS_INIT_LIST_HEAD(&lkc->ctx_list); |
54012638 DG |
265 | |
266 | return lkc; | |
267 | ||
268 | error: | |
e9404c27 JG |
269 | if (lkc) { |
270 | free(lkc->channel); | |
271 | } | |
272 | free(extended); | |
273 | free(lkc); | |
54012638 DG |
274 | return NULL; |
275 | } | |
276 | ||
645328ae DG |
277 | /* |
278 | * Allocate and init a kernel context object. | |
279 | * | |
280 | * Return the allocated object or NULL on error. | |
281 | */ | |
282 | struct ltt_kernel_context *trace_kernel_create_context( | |
283 | struct lttng_kernel_context *ctx) | |
284 | { | |
285 | struct ltt_kernel_context *kctx; | |
286 | ||
287 | kctx = zmalloc(sizeof(*kctx)); | |
288 | if (!kctx) { | |
289 | PERROR("zmalloc kernel context"); | |
290 | goto error; | |
291 | } | |
292 | ||
293 | if (ctx) { | |
294 | memcpy(&kctx->ctx, ctx, sizeof(kctx->ctx)); | |
295 | } | |
df3c77c8 JG |
296 | error: |
297 | return kctx; | |
298 | } | |
645328ae | 299 | |
df3c77c8 JG |
300 | /* |
301 | * Allocate and init a kernel context object from an existing kernel context | |
302 | * object. | |
303 | * | |
304 | * Return the allocated object or NULL on error. | |
305 | */ | |
306 | struct ltt_kernel_context *trace_kernel_copy_context( | |
307 | struct ltt_kernel_context *kctx) | |
308 | { | |
309 | struct ltt_kernel_context *kctx_copy; | |
310 | ||
311 | assert(kctx); | |
312 | kctx_copy = zmalloc(sizeof(*kctx_copy)); | |
313 | if (!kctx_copy) { | |
314 | PERROR("zmalloc ltt_kernel_context"); | |
315 | goto error; | |
316 | } | |
317 | ||
318 | memcpy(kctx_copy, kctx, sizeof(*kctx_copy)); | |
319 | memset(&kctx_copy->list, 0, sizeof(kctx_copy->list)); | |
7b9445b3 | 320 | |
645328ae | 321 | error: |
df3c77c8 | 322 | return kctx_copy; |
645328ae DG |
323 | } |
324 | ||
54012638 | 325 | /* |
050349bb | 326 | * Allocate and initialize a kernel event. Set name and event type. |
a969e101 | 327 | * We own filter_expression, and filter. |
54012638 | 328 | * |
050349bb | 329 | * Return pointer to structure or NULL. |
54012638 | 330 | */ |
71a3bb01 FD |
331 | enum lttng_error_code trace_kernel_create_event( |
332 | struct lttng_event *ev, char *filter_expression, | |
333 | struct lttng_filter_bytecode *filter, | |
334 | struct ltt_kernel_event **kernel_event) | |
54012638 | 335 | { |
71a3bb01 | 336 | enum lttng_error_code ret; |
54012638 | 337 | struct lttng_kernel_event *attr; |
71a3bb01 | 338 | struct ltt_kernel_event *local_kernel_event; |
dcabc190 | 339 | struct lttng_userspace_probe_location *userspace_probe_location = NULL; |
54012638 | 340 | |
0525e9ae DG |
341 | assert(ev); |
342 | ||
71a3bb01 | 343 | local_kernel_event = zmalloc(sizeof(struct ltt_kernel_event)); |
ba7f0ae5 | 344 | attr = zmalloc(sizeof(struct lttng_kernel_event)); |
71a3bb01 | 345 | if (local_kernel_event == NULL || attr == NULL) { |
df0f840b | 346 | PERROR("kernel event zmalloc"); |
71a3bb01 | 347 | ret = LTTNG_ERR_NOMEM; |
54012638 DG |
348 | goto error; |
349 | } | |
350 | ||
f3ed775e | 351 | switch (ev->type) { |
7d29a247 | 352 | case LTTNG_EVENT_PROBE: |
e6ddca71 | 353 | attr->instrumentation = LTTNG_KERNEL_KPROBE; |
7d29a247 DG |
354 | attr->u.kprobe.addr = ev->attr.probe.addr; |
355 | attr->u.kprobe.offset = ev->attr.probe.offset; | |
f3ed775e | 356 | strncpy(attr->u.kprobe.symbol_name, |
dbbb3ec5 DG |
357 | ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
358 | attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e | 359 | break; |
dcabc190 FD |
360 | case LTTNG_EVENT_USERSPACE_PROBE: |
361 | { | |
87597c2c JG |
362 | const struct lttng_userspace_probe_location* location = NULL; |
363 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; | |
dcabc190 FD |
364 | |
365 | location = lttng_event_get_userspace_probe_location(ev); | |
366 | if (!location) { | |
367 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
368 | goto error; | |
369 | } | |
370 | ||
371 | /* | |
372 | * From this point on, the specific term 'uprobe' is used | |
373 | * instead of the generic 'userspace probe' because it's the | |
374 | * technology used at the moment for this instrumentation. | |
375 | * LTTng currently implements userspace probes using uprobes. | |
376 | * In the interactions with the kernel tracer, we use the | |
377 | * uprobe term. | |
378 | */ | |
379 | attr->instrumentation = LTTNG_KERNEL_UPROBE; | |
380 | ||
381 | /* | |
382 | * Only the elf lookup method is supported at the moment. | |
383 | */ | |
384 | lookup = lttng_userspace_probe_location_get_lookup_method( | |
385 | location); | |
386 | if (!lookup) { | |
387 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
388 | goto error; | |
389 | } | |
390 | ||
391 | /* | |
392 | * From the kernel tracer's perspective, all userspace probe | |
393 | * event types are all the same: a file and an offset. | |
394 | */ | |
395 | switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) { | |
396 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
397 | /* Get the file descriptor on the target binary. */ | |
398 | attr->u.uprobe.fd = | |
399 | lttng_userspace_probe_location_function_get_binary_fd(location); | |
400 | ||
401 | /* | |
402 | * Save a reference to the probe location used during | |
403 | * the listing of events. Close its FD since it won't | |
404 | * be needed for listing. | |
405 | */ | |
406 | userspace_probe_location = | |
407 | lttng_userspace_probe_location_copy(location); | |
408 | ret = lttng_userspace_probe_location_function_set_binary_fd( | |
409 | userspace_probe_location, -1); | |
410 | if (ret) { | |
411 | goto error; | |
412 | } | |
413 | break; | |
414 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
415 | /* Get the file descriptor on the target binary. */ | |
416 | attr->u.uprobe.fd = | |
417 | lttng_userspace_probe_location_tracepoint_get_binary_fd(location); | |
418 | ||
419 | /* | |
420 | * Save a reference to the probe location used during the listing of | |
421 | * events. Close its FD since it won't be needed for listing. | |
422 | */ | |
423 | userspace_probe_location = | |
424 | lttng_userspace_probe_location_copy(location); | |
425 | ret = lttng_userspace_probe_location_tracepoint_set_binary_fd( | |
426 | userspace_probe_location, -1); | |
427 | if (ret) { | |
428 | goto error; | |
429 | } | |
430 | break; | |
431 | default: | |
432 | DBG("Unsupported lookup method type"); | |
433 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
434 | goto error; | |
435 | } | |
436 | break; | |
437 | } | |
f3ed775e | 438 | case LTTNG_EVENT_FUNCTION: |
8f0d098b MD |
439 | attr->instrumentation = LTTNG_KERNEL_KRETPROBE; |
440 | attr->u.kretprobe.addr = ev->attr.probe.addr; | |
441 | attr->u.kretprobe.offset = ev->attr.probe.offset; | |
8f0d098b | 442 | strncpy(attr->u.kretprobe.symbol_name, |
dbbb3ec5 DG |
443 | ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
444 | attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
8f0d098b MD |
445 | break; |
446 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
f3ed775e DG |
447 | attr->instrumentation = LTTNG_KERNEL_FUNCTION; |
448 | strncpy(attr->u.ftrace.symbol_name, | |
dbbb3ec5 DG |
449 | ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
450 | attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e | 451 | break; |
e6ddca71 DG |
452 | case LTTNG_EVENT_TRACEPOINT: |
453 | attr->instrumentation = LTTNG_KERNEL_TRACEPOINT; | |
f3ed775e | 454 | break; |
a54bd42d MD |
455 | case LTTNG_EVENT_SYSCALL: |
456 | attr->instrumentation = LTTNG_KERNEL_SYSCALL; | |
0133c199 | 457 | break; |
7a3d1328 MD |
458 | case LTTNG_EVENT_ALL: |
459 | attr->instrumentation = LTTNG_KERNEL_ALL; | |
460 | break; | |
f3ed775e DG |
461 | default: |
462 | ERR("Unknown kernel instrumentation type (%d)", ev->type); | |
71a3bb01 | 463 | ret = LTTNG_ERR_INVALID; |
f3ed775e DG |
464 | goto error; |
465 | } | |
466 | ||
467 | /* Copy event name */ | |
dbbb3ec5 DG |
468 | strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN); |
469 | attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f3ed775e | 470 | |
54012638 | 471 | /* Setting up a kernel event */ |
71a3bb01 FD |
472 | local_kernel_event->fd = -1; |
473 | local_kernel_event->event = attr; | |
474 | local_kernel_event->enabled = 1; | |
475 | local_kernel_event->filter_expression = filter_expression; | |
476 | local_kernel_event->filter = filter; | |
dcabc190 | 477 | local_kernel_event->userspace_probe_location = userspace_probe_location; |
54012638 | 478 | |
71a3bb01 FD |
479 | *kernel_event = local_kernel_event; |
480 | ||
481 | return LTTNG_OK; | |
54012638 DG |
482 | |
483 | error: | |
a969e101 MD |
484 | free(filter_expression); |
485 | free(filter); | |
71a3bb01 | 486 | free(local_kernel_event); |
a2c0da86 | 487 | free(attr); |
71a3bb01 | 488 | return ret; |
54012638 DG |
489 | } |
490 | ||
491 | /* | |
050349bb | 492 | * Allocate and initialize a kernel metadata. |
54012638 | 493 | * |
050349bb | 494 | * Return pointer to structure or NULL. |
54012638 | 495 | */ |
a4b92340 | 496 | struct ltt_kernel_metadata *trace_kernel_create_metadata(void) |
54012638 | 497 | { |
54012638 | 498 | struct ltt_kernel_metadata *lkm; |
f3ed775e | 499 | struct lttng_channel *chan; |
54012638 | 500 | |
ba7f0ae5 DG |
501 | lkm = zmalloc(sizeof(struct ltt_kernel_metadata)); |
502 | chan = zmalloc(sizeof(struct lttng_channel)); | |
f3ed775e | 503 | if (lkm == NULL || chan == NULL) { |
df0f840b | 504 | PERROR("kernel metadata zmalloc"); |
54012638 DG |
505 | goto error; |
506 | } | |
507 | ||
508 | /* Set default attributes */ | |
f3ed775e | 509 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
3e230f92 | 510 | chan->attr.subbuf_size = default_get_metadata_subbuf_size(); |
b389abbe | 511 | chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; |
6bb9e85f MD |
512 | chan->attr.switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
513 | chan->attr.read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; | |
7d452e12 | 514 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
54012638 DG |
515 | |
516 | /* Init metadata */ | |
03550b58 | 517 | lkm->fd = -1; |
f3ed775e | 518 | lkm->conf = chan; |
54012638 DG |
519 | |
520 | return lkm; | |
521 | ||
522 | error: | |
a2c0da86 MD |
523 | free(lkm); |
524 | free(chan); | |
54012638 DG |
525 | return NULL; |
526 | } | |
527 | ||
528 | /* | |
050349bb DG |
529 | * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by |
530 | * default. | |
54012638 | 531 | * |
050349bb | 532 | * Return pointer to structure or NULL. |
54012638 | 533 | */ |
00e2e675 DG |
534 | struct ltt_kernel_stream *trace_kernel_create_stream(const char *name, |
535 | unsigned int count) | |
54012638 | 536 | { |
00e2e675 | 537 | int ret; |
54012638 DG |
538 | struct ltt_kernel_stream *lks; |
539 | ||
0525e9ae DG |
540 | assert(name); |
541 | ||
ba7f0ae5 | 542 | lks = zmalloc(sizeof(struct ltt_kernel_stream)); |
54012638 | 543 | if (lks == NULL) { |
df0f840b | 544 | PERROR("kernel stream zmalloc"); |
54012638 DG |
545 | goto error; |
546 | } | |
547 | ||
00e2e675 | 548 | /* Set name */ |
535b8ff4 | 549 | ret = snprintf(lks->name, sizeof(lks->name), "%s_%u", name, count); |
00e2e675 DG |
550 | if (ret < 0) { |
551 | PERROR("snprintf stream name"); | |
552 | goto error; | |
553 | } | |
554 | lks->name[sizeof(lks->name) - 1] = '\0'; | |
555 | ||
54012638 | 556 | /* Init stream */ |
03550b58 | 557 | lks->fd = -1; |
54012638 | 558 | lks->state = 0; |
ffe60014 | 559 | lks->cpu = count; |
54012638 DG |
560 | |
561 | return lks; | |
562 | ||
563 | error: | |
564 | return NULL; | |
565 | } | |
c363b55d | 566 | |
050349bb DG |
567 | /* |
568 | * Cleanup kernel stream structure. | |
569 | */ | |
62499ad6 | 570 | void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream) |
c363b55d | 571 | { |
0525e9ae DG |
572 | assert(stream); |
573 | ||
33a2b854 | 574 | DBG("[trace] Closing stream fd %d", stream->fd); |
c363b55d | 575 | /* Close kernel fd */ |
03550b58 | 576 | if (stream->fd >= 0) { |
c617c0c6 MD |
577 | int ret; |
578 | ||
03550b58 MD |
579 | ret = close(stream->fd); |
580 | if (ret) { | |
581 | PERROR("close"); | |
582 | } | |
799e2c4f | 583 | } |
c363b55d DG |
584 | /* Remove from stream list */ |
585 | cds_list_del(&stream->list); | |
f9815039 | 586 | |
c363b55d DG |
587 | free(stream); |
588 | } | |
589 | ||
050349bb DG |
590 | /* |
591 | * Cleanup kernel event structure. | |
592 | */ | |
62499ad6 | 593 | void trace_kernel_destroy_event(struct ltt_kernel_event *event) |
c363b55d | 594 | { |
0525e9ae DG |
595 | assert(event); |
596 | ||
87eb4ab8 | 597 | if (event->fd >= 0) { |
c617c0c6 MD |
598 | int ret; |
599 | ||
87eb4ab8 MD |
600 | DBG("[trace] Closing event fd %d", event->fd); |
601 | /* Close kernel fd */ | |
799e2c4f MD |
602 | ret = close(event->fd); |
603 | if (ret) { | |
604 | PERROR("close"); | |
605 | } | |
87eb4ab8 MD |
606 | } else { |
607 | DBG("[trace] Tearing down event (no associated fd)"); | |
608 | } | |
c363b55d DG |
609 | |
610 | /* Remove from event list */ | |
611 | cds_list_del(&event->list); | |
f9815039 | 612 | |
00a62084 MD |
613 | free(event->filter_expression); |
614 | free(event->filter); | |
615 | ||
f9815039 | 616 | free(event->event); |
c363b55d DG |
617 | free(event); |
618 | } | |
619 | ||
645328ae DG |
620 | /* |
621 | * Cleanup kernel context structure. | |
622 | */ | |
623 | void trace_kernel_destroy_context(struct ltt_kernel_context *ctx) | |
624 | { | |
625 | assert(ctx); | |
626 | ||
ba985c3a JG |
627 | if (ctx->in_list) { |
628 | cds_list_del(&ctx->list); | |
629 | } | |
645328ae DG |
630 | free(ctx); |
631 | } | |
632 | ||
050349bb DG |
633 | /* |
634 | * Cleanup kernel channel structure. | |
635 | */ | |
62499ad6 | 636 | void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel) |
c363b55d | 637 | { |
af9737e9 DG |
638 | struct ltt_kernel_stream *stream, *stmp; |
639 | struct ltt_kernel_event *event, *etmp; | |
645328ae | 640 | struct ltt_kernel_context *ctx, *ctmp; |
799e2c4f | 641 | int ret; |
e9404c27 | 642 | enum lttng_error_code status; |
c363b55d | 643 | |
0525e9ae DG |
644 | assert(channel); |
645 | ||
33a2b854 | 646 | DBG("[trace] Closing channel fd %d", channel->fd); |
c363b55d | 647 | /* Close kernel fd */ |
03550b58 MD |
648 | if (channel->fd >= 0) { |
649 | ret = close(channel->fd); | |
650 | if (ret) { | |
651 | PERROR("close"); | |
652 | } | |
799e2c4f | 653 | } |
c363b55d DG |
654 | |
655 | /* For each stream in the channel list */ | |
af9737e9 | 656 | cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) { |
62499ad6 | 657 | trace_kernel_destroy_stream(stream); |
c363b55d DG |
658 | } |
659 | ||
660 | /* For each event in the channel list */ | |
af9737e9 | 661 | cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) { |
62499ad6 | 662 | trace_kernel_destroy_event(event); |
c363b55d DG |
663 | } |
664 | ||
645328ae DG |
665 | /* For each context in the channel list */ |
666 | cds_list_for_each_entry_safe(ctx, ctmp, &channel->ctx_list, list) { | |
667 | trace_kernel_destroy_context(ctx); | |
668 | } | |
669 | ||
c363b55d DG |
670 | /* Remove from channel list */ |
671 | cds_list_del(&channel->list); | |
f9815039 | 672 | |
753873bf JR |
673 | if (notification_thread_handle |
674 | && channel->published_to_notification_thread) { | |
63aaa3dc JG |
675 | status = notification_thread_command_remove_channel( |
676 | notification_thread_handle, | |
e1f3997a | 677 | channel->key, LTTNG_DOMAIN_KERNEL); |
63aaa3dc JG |
678 | assert(status == LTTNG_OK); |
679 | } | |
e9404c27 | 680 | free(channel->channel->attr.extended.ptr); |
f9815039 | 681 | free(channel->channel); |
c363b55d DG |
682 | free(channel); |
683 | } | |
684 | ||
050349bb DG |
685 | /* |
686 | * Cleanup kernel metadata structure. | |
687 | */ | |
62499ad6 | 688 | void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata) |
c363b55d | 689 | { |
0525e9ae DG |
690 | assert(metadata); |
691 | ||
33a2b854 | 692 | DBG("[trace] Closing metadata fd %d", metadata->fd); |
c363b55d | 693 | /* Close kernel fd */ |
03550b58 | 694 | if (metadata->fd >= 0) { |
c617c0c6 MD |
695 | int ret; |
696 | ||
03550b58 MD |
697 | ret = close(metadata->fd); |
698 | if (ret) { | |
699 | PERROR("close"); | |
700 | } | |
799e2c4f | 701 | } |
c363b55d | 702 | |
f9815039 | 703 | free(metadata->conf); |
c363b55d DG |
704 | free(metadata); |
705 | } | |
706 | ||
050349bb | 707 | /* |
62499ad6 | 708 | * Cleanup kernel session structure |
36b588ed MD |
709 | * |
710 | * Should *NOT* be called with RCU read-side lock held. | |
050349bb | 711 | */ |
62499ad6 | 712 | void trace_kernel_destroy_session(struct ltt_kernel_session *session) |
c363b55d | 713 | { |
af9737e9 | 714 | struct ltt_kernel_channel *channel, *ctmp; |
799e2c4f | 715 | int ret; |
c363b55d | 716 | |
0525e9ae DG |
717 | assert(session); |
718 | ||
33a2b854 | 719 | DBG("[trace] Closing session fd %d", session->fd); |
c363b55d | 720 | /* Close kernel fds */ |
03550b58 MD |
721 | if (session->fd >= 0) { |
722 | ret = close(session->fd); | |
723 | if (ret) { | |
724 | PERROR("close"); | |
725 | } | |
799e2c4f | 726 | } |
f9815039 | 727 | |
03550b58 | 728 | if (session->metadata_stream_fd >= 0) { |
70dc1c34 | 729 | DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd); |
799e2c4f MD |
730 | ret = close(session->metadata_stream_fd); |
731 | if (ret) { | |
732 | PERROR("close"); | |
733 | } | |
70dc1c34 | 734 | } |
c363b55d | 735 | |
d36b8583 | 736 | if (session->metadata != NULL) { |
62499ad6 | 737 | trace_kernel_destroy_metadata(session->metadata); |
d36b8583 | 738 | } |
c363b55d | 739 | |
af9737e9 | 740 | cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) { |
62499ad6 | 741 | trace_kernel_destroy_channel(channel); |
c363b55d | 742 | } |
d070c424 | 743 | } |
c363b55d | 744 | |
d070c424 MD |
745 | /* Free elements needed by destroy notifiers. */ |
746 | void trace_kernel_free_session(struct ltt_kernel_session *session) | |
747 | { | |
00e2e675 | 748 | /* Wipe consumer output object */ |
6addfa37 | 749 | consumer_output_put(session->consumer); |
00e2e675 | 750 | |
55c9e7ca JR |
751 | lttng_tracker_list_destroy(session->tracker_list_pid); |
752 | lttng_tracker_list_destroy(session->tracker_list_vpid); | |
753 | lttng_tracker_list_destroy(session->tracker_list_uid); | |
754 | lttng_tracker_list_destroy(session->tracker_list_vuid); | |
755 | lttng_tracker_list_destroy(session->tracker_list_gid); | |
756 | lttng_tracker_list_destroy(session->tracker_list_vgid); | |
757 | ||
c363b55d DG |
758 | free(session); |
759 | } |