Commit | Line | Data |
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f4681817 MD |
1 | /* |
2 | * lttng-ust-abi.c | |
3 | * | |
f4681817 MD |
4 | * LTTng UST ABI |
5 | * | |
e92f3e28 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | * | |
22 | * | |
f4681817 MD |
23 | * Mimic system calls for: |
24 | * - session creation, returns an object descriptor or failure. | |
25 | * - channel creation, returns an object descriptor or failure. | |
26 | * - Operates on a session object descriptor | |
27 | * - Takes all channel options as parameters. | |
28 | * - stream get, returns an object descriptor or failure. | |
29 | * - Operates on a channel object descriptor. | |
30 | * - stream notifier get, returns an object descriptor or failure. | |
31 | * - Operates on a channel object descriptor. | |
32 | * - event creation, returns an object descriptor or failure. | |
33 | * - Operates on a channel object descriptor | |
34 | * - Takes an event name as parameter | |
35 | * - Takes an instrumentation source as parameter | |
36 | * - e.g. tracepoints, dynamic_probes... | |
37 | * - Takes instrumentation source specific arguments. | |
f4681817 MD |
38 | */ |
39 | ||
3fbec7dc | 40 | #define _LGPL_SOURCE |
d8d2416d | 41 | #include <fcntl.h> |
fb31eb73 | 42 | #include <stdint.h> |
4e79769f | 43 | #include <unistd.h> |
fb31eb73 | 44 | |
f4681817 MD |
45 | #include <urcu/compiler.h> |
46 | #include <urcu/list.h> | |
fb31eb73 FD |
47 | |
48 | #include <helper.h> | |
49 | #include <lttng/tracepoint.h> | |
50 | #include <lttng/ust-abi.h> | |
51 | #include <lttng/ust-error.h> | |
4318ae1b | 52 | #include <lttng/ust-events.h> |
23c8854a | 53 | #include <lttng/ust-version.h> |
6548fca4 | 54 | #include <ust-fd.h> |
44c72f10 | 55 | #include <usterr-signal-safe.h> |
fb31eb73 FD |
56 | |
57 | #include "../libringbuffer/frontend_types.h" | |
58 | #include "../libringbuffer/shm.h" | |
7dd08bec | 59 | #include "lttng-tracer.h" |
196ec2df | 60 | #include "string-utils.h" |
d871c65b | 61 | #include "ust-events-internal.h" |
4ab44fbe | 62 | |
7047f3da MD |
63 | #define OBJ_NAME_LEN 16 |
64 | ||
45e9e699 MD |
65 | static int lttng_ust_abi_close_in_progress; |
66 | ||
51489cad | 67 | static |
f59ed768 | 68 | int lttng_abi_tracepoint_list(void *owner); |
06d4f27e | 69 | static |
f59ed768 | 70 | int lttng_abi_tracepoint_field_list(void *owner); |
51489cad | 71 | |
f4681817 MD |
72 | /* |
73 | * Object descriptor table. Should be protected from concurrent access | |
74 | * by the caller. | |
75 | */ | |
76 | ||
b61ce3b2 | 77 | struct lttng_ust_obj { |
f4681817 MD |
78 | union { |
79 | struct { | |
80 | void *private_data; | |
b61ce3b2 | 81 | const struct lttng_ust_objd_ops *ops; |
f4681817 | 82 | int f_count; |
1849ef7c | 83 | int owner_ref; /* has ref from owner */ |
f59ed768 | 84 | void *owner; |
7047f3da | 85 | char name[OBJ_NAME_LEN]; |
f4681817 MD |
86 | } s; |
87 | int freelist_next; /* offset freelist. end is -1. */ | |
88 | } u; | |
89 | }; | |
90 | ||
b61ce3b2 MD |
91 | struct lttng_ust_objd_table { |
92 | struct lttng_ust_obj *array; | |
f4681817 MD |
93 | unsigned int len, allocated_len; |
94 | int freelist_head; /* offset freelist head. end is -1 */ | |
95 | }; | |
96 | ||
b61ce3b2 | 97 | static struct lttng_ust_objd_table objd_table = { |
f4681817 MD |
98 | .freelist_head = -1, |
99 | }; | |
100 | ||
101 | static | |
f59ed768 | 102 | int objd_alloc(void *private_data, const struct lttng_ust_objd_ops *ops, |
7047f3da | 103 | void *owner, const char *name) |
f4681817 | 104 | { |
b61ce3b2 | 105 | struct lttng_ust_obj *obj; |
f4681817 MD |
106 | |
107 | if (objd_table.freelist_head != -1) { | |
108 | obj = &objd_table.array[objd_table.freelist_head]; | |
109 | objd_table.freelist_head = obj->u.freelist_next; | |
110 | goto end; | |
111 | } | |
112 | ||
113 | if (objd_table.len >= objd_table.allocated_len) { | |
114 | unsigned int new_allocated_len, old_allocated_len; | |
b61ce3b2 | 115 | struct lttng_ust_obj *new_table, *old_table; |
f4681817 MD |
116 | |
117 | old_allocated_len = objd_table.allocated_len; | |
118 | old_table = objd_table.array; | |
119 | if (!old_allocated_len) | |
120 | new_allocated_len = 1; | |
121 | else | |
122 | new_allocated_len = old_allocated_len << 1; | |
b61ce3b2 | 123 | new_table = zmalloc(sizeof(struct lttng_ust_obj) * new_allocated_len); |
f4681817 MD |
124 | if (!new_table) |
125 | return -ENOMEM; | |
126 | memcpy(new_table, old_table, | |
b61ce3b2 | 127 | sizeof(struct lttng_ust_obj) * old_allocated_len); |
f4681817 MD |
128 | free(old_table); |
129 | objd_table.array = new_table; | |
130 | objd_table.allocated_len = new_allocated_len; | |
131 | } | |
132 | obj = &objd_table.array[objd_table.len]; | |
133 | objd_table.len++; | |
134 | end: | |
135 | obj->u.s.private_data = private_data; | |
136 | obj->u.s.ops = ops; | |
a4be8962 MD |
137 | obj->u.s.f_count = 2; /* count == 1 : object is allocated */ |
138 | /* count == 2 : allocated + hold ref */ | |
1849ef7c | 139 | obj->u.s.owner_ref = 1; /* One owner reference */ |
f59ed768 | 140 | obj->u.s.owner = owner; |
7047f3da MD |
141 | strncpy(obj->u.s.name, name, OBJ_NAME_LEN); |
142 | obj->u.s.name[OBJ_NAME_LEN - 1] = '\0'; | |
f4681817 MD |
143 | return obj - objd_table.array; |
144 | } | |
145 | ||
146 | static | |
b61ce3b2 | 147 | struct lttng_ust_obj *_objd_get(int id) |
f4681817 MD |
148 | { |
149 | if (id >= objd_table.len) | |
150 | return NULL; | |
a4be8962 MD |
151 | if (!objd_table.array[id].u.s.f_count) |
152 | return NULL; | |
f4681817 MD |
153 | return &objd_table.array[id]; |
154 | } | |
155 | ||
156 | static | |
157 | void *objd_private(int id) | |
158 | { | |
b61ce3b2 | 159 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
160 | assert(obj); |
161 | return obj->u.s.private_data; | |
162 | } | |
163 | ||
164 | static | |
165 | void objd_set_private(int id, void *private_data) | |
166 | { | |
b61ce3b2 | 167 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
168 | assert(obj); |
169 | obj->u.s.private_data = private_data; | |
170 | } | |
171 | ||
b61ce3b2 | 172 | const struct lttng_ust_objd_ops *objd_ops(int id) |
f4681817 | 173 | { |
b61ce3b2 | 174 | struct lttng_ust_obj *obj = _objd_get(id); |
46050b1a | 175 | |
a4be8962 MD |
176 | if (!obj) |
177 | return NULL; | |
f4681817 MD |
178 | return obj->u.s.ops; |
179 | } | |
180 | ||
181 | static | |
182 | void objd_free(int id) | |
183 | { | |
b61ce3b2 | 184 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
185 | |
186 | assert(obj); | |
187 | obj->u.freelist_next = objd_table.freelist_head; | |
188 | objd_table.freelist_head = obj - objd_table.array; | |
a4be8962 MD |
189 | assert(obj->u.s.f_count == 1); |
190 | obj->u.s.f_count = 0; /* deallocated */ | |
f4681817 MD |
191 | } |
192 | ||
193 | static | |
194 | void objd_ref(int id) | |
195 | { | |
b61ce3b2 | 196 | struct lttng_ust_obj *obj = _objd_get(id); |
072886c4 | 197 | assert(obj != NULL); |
f4681817 MD |
198 | obj->u.s.f_count++; |
199 | } | |
200 | ||
1849ef7c | 201 | int lttng_ust_objd_unref(int id, int is_owner) |
f4681817 | 202 | { |
b61ce3b2 | 203 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 | 204 | |
1ea11eab MD |
205 | if (!obj) |
206 | return -EINVAL; | |
a4be8962 MD |
207 | if (obj->u.s.f_count == 1) { |
208 | ERR("Reference counting error\n"); | |
209 | return -EINVAL; | |
210 | } | |
1849ef7c MD |
211 | if (is_owner) { |
212 | if (!obj->u.s.owner_ref) { | |
213 | ERR("Error decrementing owner reference"); | |
214 | return -EINVAL; | |
215 | } | |
216 | obj->u.s.owner_ref--; | |
217 | } | |
a4be8962 | 218 | if ((--obj->u.s.f_count) == 1) { |
b61ce3b2 | 219 | const struct lttng_ust_objd_ops *ops = objd_ops(id); |
196ec2df | 220 | |
f4681817 MD |
221 | if (ops->release) |
222 | ops->release(id); | |
223 | objd_free(id); | |
224 | } | |
1ea11eab | 225 | return 0; |
f4681817 MD |
226 | } |
227 | ||
228 | static | |
229 | void objd_table_destroy(void) | |
230 | { | |
a4be8962 MD |
231 | int i; |
232 | ||
1849ef7c MD |
233 | for (i = 0; i < objd_table.allocated_len; i++) { |
234 | struct lttng_ust_obj *obj; | |
235 | ||
236 | obj = _objd_get(i); | |
237 | if (!obj) | |
238 | continue; | |
239 | if (!obj->u.s.owner_ref) | |
240 | continue; /* only unref owner ref. */ | |
241 | (void) lttng_ust_objd_unref(i, 1); | |
242 | } | |
f4681817 | 243 | free(objd_table.array); |
02fb3381 MD |
244 | objd_table.array = NULL; |
245 | objd_table.len = 0; | |
246 | objd_table.allocated_len = 0; | |
17dfb34b | 247 | objd_table.freelist_head = -1; |
f4681817 MD |
248 | } |
249 | ||
74d81a6c MD |
250 | const char *lttng_ust_obj_get_name(int id) |
251 | { | |
252 | struct lttng_ust_obj *obj = _objd_get(id); | |
253 | ||
254 | if (!obj) | |
255 | return NULL; | |
256 | return obj->u.s.name; | |
257 | } | |
258 | ||
f59ed768 MD |
259 | void lttng_ust_objd_table_owner_cleanup(void *owner) |
260 | { | |
261 | int i; | |
262 | ||
263 | for (i = 0; i < objd_table.allocated_len; i++) { | |
264 | struct lttng_ust_obj *obj; | |
265 | ||
266 | obj = _objd_get(i); | |
267 | if (!obj) | |
268 | continue; | |
269 | if (!obj->u.s.owner) | |
270 | continue; /* skip root handles */ | |
1849ef7c MD |
271 | if (!obj->u.s.owner_ref) |
272 | continue; /* only unref owner ref. */ | |
f59ed768 | 273 | if (obj->u.s.owner == owner) |
1849ef7c | 274 | (void) lttng_ust_objd_unref(i, 1); |
f59ed768 MD |
275 | } |
276 | } | |
277 | ||
f4681817 MD |
278 | /* |
279 | * This is LTTng's own personal way to create an ABI for sessiond. | |
280 | * We send commands over a socket. | |
281 | */ | |
282 | ||
b61ce3b2 | 283 | static const struct lttng_ust_objd_ops lttng_ops; |
d8d2416d | 284 | static const struct lttng_ust_objd_ops lttng_event_notifier_group_ops; |
b61ce3b2 MD |
285 | static const struct lttng_ust_objd_ops lttng_session_ops; |
286 | static const struct lttng_ust_objd_ops lttng_channel_ops; | |
d871c65b | 287 | static const struct lttng_ust_objd_ops lttng_event_enabler_ops; |
d8d2416d | 288 | static const struct lttng_ust_objd_ops lttng_event_notifier_enabler_ops; |
51489cad | 289 | static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops; |
06d4f27e | 290 | static const struct lttng_ust_objd_ops lttng_tracepoint_field_list_ops; |
f4681817 | 291 | |
46050b1a MD |
292 | int lttng_abi_create_root_handle(void) |
293 | { | |
294 | int root_handle; | |
295 | ||
f59ed768 | 296 | /* root handles have NULL owners */ |
7047f3da | 297 | root_handle = objd_alloc(NULL, <tng_ops, NULL, "root"); |
46050b1a MD |
298 | return root_handle; |
299 | } | |
300 | ||
74d81a6c MD |
301 | static |
302 | int lttng_is_channel_ready(struct lttng_channel *lttng_chan) | |
303 | { | |
304 | struct channel *chan; | |
305 | unsigned int nr_streams, exp_streams; | |
306 | ||
307 | chan = lttng_chan->chan; | |
308 | nr_streams = channel_handle_get_nr_streams(lttng_chan->handle); | |
309 | exp_streams = chan->nr_streams; | |
310 | return nr_streams == exp_streams; | |
311 | } | |
312 | ||
818173b9 | 313 | static |
f59ed768 | 314 | int lttng_abi_create_session(void *owner) |
f4681817 | 315 | { |
7dd08bec | 316 | struct lttng_session *session; |
f4681817 MD |
317 | int session_objd, ret; |
318 | ||
7dd08bec | 319 | session = lttng_session_create(); |
f4681817 MD |
320 | if (!session) |
321 | return -ENOMEM; | |
7047f3da | 322 | session_objd = objd_alloc(session, <tng_session_ops, owner, "session"); |
f4681817 MD |
323 | if (session_objd < 0) { |
324 | ret = session_objd; | |
325 | goto objd_error; | |
326 | } | |
327 | session->objd = session_objd; | |
32ce8569 | 328 | session->owner = owner; |
f4681817 MD |
329 | return session_objd; |
330 | ||
331 | objd_error: | |
7dd08bec | 332 | lttng_session_destroy(session); |
f4681817 MD |
333 | return ret; |
334 | } | |
335 | ||
f4681817 MD |
336 | static |
337 | long lttng_abi_tracer_version(int objd, | |
338 | struct lttng_ust_tracer_version *v) | |
339 | { | |
32ce8569 MD |
340 | v->major = LTTNG_UST_MAJOR_VERSION; |
341 | v->minor = LTTNG_UST_MINOR_VERSION; | |
342 | v->patchlevel = LTTNG_UST_PATCHLEVEL_VERSION; | |
f4681817 MD |
343 | return 0; |
344 | } | |
345 | ||
d8d2416d FD |
346 | static |
347 | int lttng_abi_event_notifier_send_fd(void *owner, int event_notifier_notif_fd) | |
348 | { | |
349 | struct lttng_event_notifier_group *event_notifier_group; | |
350 | int event_notifier_group_objd, ret, fd_flag, close_ret; | |
351 | ||
352 | event_notifier_group = lttng_event_notifier_group_create(); | |
353 | if (!event_notifier_group) | |
354 | return -ENOMEM; | |
355 | ||
356 | /* | |
357 | * Set this file descriptor as NON-BLOCKING. | |
358 | */ | |
359 | fd_flag = fcntl(event_notifier_notif_fd, F_GETFL); | |
360 | ||
361 | fd_flag |= O_NONBLOCK; | |
362 | ||
363 | ret = fcntl(event_notifier_notif_fd, F_SETFL, fd_flag); | |
364 | if (ret) { | |
365 | ret = -errno; | |
366 | goto fd_error; | |
367 | } | |
368 | ||
369 | event_notifier_group_objd = objd_alloc(event_notifier_group, | |
370 | <tng_event_notifier_group_ops, owner, "event_notifier_group"); | |
371 | if (event_notifier_group_objd < 0) { | |
372 | ret = event_notifier_group_objd; | |
373 | goto objd_error; | |
374 | } | |
375 | ||
376 | event_notifier_group->objd = event_notifier_group_objd; | |
377 | event_notifier_group->owner = owner; | |
378 | event_notifier_group->notification_fd = event_notifier_notif_fd; | |
379 | ||
380 | return event_notifier_group_objd; | |
381 | ||
382 | objd_error: | |
383 | lttng_event_notifier_group_destroy(event_notifier_group); | |
384 | fd_error: | |
385 | close_ret = close(event_notifier_notif_fd); | |
386 | if (close_ret) { | |
387 | PERROR("close"); | |
388 | } | |
389 | ||
390 | return ret; | |
391 | } | |
392 | ||
f4681817 MD |
393 | static |
394 | long lttng_abi_add_context(int objd, | |
395 | struct lttng_ust_context *context_param, | |
8e696cfa | 396 | union ust_args *uargs, |
7dd08bec | 397 | struct lttng_ctx **ctx, struct lttng_session *session) |
f4681817 | 398 | { |
8e696cfa | 399 | return lttng_attach_context(context_param, uargs, ctx, session); |
f4681817 MD |
400 | } |
401 | ||
402 | /** | |
403 | * lttng_cmd - lttng control through socket commands | |
404 | * | |
405 | * @objd: the object descriptor | |
406 | * @cmd: the command | |
407 | * @arg: command arg | |
ef9ff354 | 408 | * @uargs: UST arguments (internal) |
f59ed768 | 409 | * @owner: objd owner |
f4681817 MD |
410 | * |
411 | * This descriptor implements lttng commands: | |
412 | * LTTNG_UST_SESSION | |
413 | * Returns a LTTng trace session object descriptor | |
414 | * LTTNG_UST_TRACER_VERSION | |
415 | * Returns the LTTng kernel tracer version | |
416 | * LTTNG_UST_TRACEPOINT_LIST | |
417 | * Returns a file descriptor listing available tracepoints | |
06d4f27e MD |
418 | * LTTNG_UST_TRACEPOINT_FIELD_LIST |
419 | * Returns a file descriptor listing available tracepoint fields | |
f4681817 MD |
420 | * LTTNG_UST_WAIT_QUIESCENT |
421 | * Returns after all previously running probes have completed | |
422 | * | |
423 | * The returned session will be deleted when its file descriptor is closed. | |
424 | */ | |
425 | static | |
ef9ff354 | 426 | long lttng_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 427 | union ust_args *uargs, void *owner) |
f4681817 MD |
428 | { |
429 | switch (cmd) { | |
430 | case LTTNG_UST_SESSION: | |
f59ed768 | 431 | return lttng_abi_create_session(owner); |
f4681817 MD |
432 | case LTTNG_UST_TRACER_VERSION: |
433 | return lttng_abi_tracer_version(objd, | |
434 | (struct lttng_ust_tracer_version *) arg); | |
435 | case LTTNG_UST_TRACEPOINT_LIST: | |
f59ed768 | 436 | return lttng_abi_tracepoint_list(owner); |
06d4f27e | 437 | case LTTNG_UST_TRACEPOINT_FIELD_LIST: |
f59ed768 | 438 | return lttng_abi_tracepoint_field_list(owner); |
f4681817 MD |
439 | case LTTNG_UST_WAIT_QUIESCENT: |
440 | synchronize_trace(); | |
441 | return 0; | |
d8d2416d FD |
442 | case LTTNG_UST_EVENT_NOTIFIER_GROUP_CREATE: |
443 | return lttng_abi_event_notifier_send_fd(owner, | |
444 | uargs->event_notifier_handle.event_notifier_notif_fd); | |
f4681817 MD |
445 | default: |
446 | return -EINVAL; | |
447 | } | |
448 | } | |
449 | ||
b61ce3b2 | 450 | static const struct lttng_ust_objd_ops lttng_ops = { |
f4681817 MD |
451 | .cmd = lttng_cmd, |
452 | }; | |
453 | ||
74d81a6c MD |
454 | int lttng_abi_map_channel(int session_objd, |
455 | struct lttng_ust_channel *ust_chan, | |
456 | union ust_args *uargs, | |
457 | void *owner) | |
f4681817 | 458 | { |
7dd08bec | 459 | struct lttng_session *session = objd_private(session_objd); |
f4681817 | 460 | const char *transport_name; |
74d81a6c MD |
461 | const struct lttng_transport *transport; |
462 | const char *chan_name; | |
f4681817 | 463 | int chan_objd; |
74d81a6c MD |
464 | struct lttng_ust_shm_handle *channel_handle; |
465 | struct lttng_channel *lttng_chan; | |
466 | struct channel *chan; | |
467 | struct lttng_ust_lib_ring_buffer_config *config; | |
468 | void *chan_data; | |
ff0f5728 | 469 | int wakeup_fd; |
74d81a6c MD |
470 | uint64_t len; |
471 | int ret; | |
472 | enum lttng_ust_chan_type type; | |
473 | ||
474 | chan_data = uargs->channel.chan_data; | |
ff0f5728 | 475 | wakeup_fd = uargs->channel.wakeup_fd; |
74d81a6c MD |
476 | len = ust_chan->len; |
477 | type = ust_chan->type; | |
478 | ||
479 | switch (type) { | |
480 | case LTTNG_UST_CHAN_PER_CPU: | |
74d81a6c MD |
481 | break; |
482 | default: | |
ff0f5728 MD |
483 | ret = -EINVAL; |
484 | goto invalid; | |
74d81a6c MD |
485 | } |
486 | ||
487 | if (session->been_active) { | |
488 | ret = -EBUSY; | |
489 | goto active; /* Refuse to add channel to active session */ | |
490 | } | |
f4681817 | 491 | |
ff0f5728 | 492 | channel_handle = channel_handle_create(chan_data, len, wakeup_fd); |
74d81a6c MD |
493 | if (!channel_handle) { |
494 | ret = -EINVAL; | |
495 | goto handle_error; | |
496 | } | |
497 | ||
498 | chan = shmp(channel_handle, channel_handle->chan); | |
499 | assert(chan); | |
03d2d293 | 500 | chan->handle = channel_handle; |
74d81a6c MD |
501 | config = &chan->backend.config; |
502 | lttng_chan = channel_get_private(chan); | |
503 | if (!lttng_chan) { | |
504 | ret = -EINVAL; | |
505 | goto alloc_error; | |
506 | } | |
507 | ||
508 | /* Lookup transport name */ | |
509 | switch (type) { | |
510 | case LTTNG_UST_CHAN_PER_CPU: | |
511 | if (config->output == RING_BUFFER_MMAP) { | |
34a91bdb MD |
512 | if (config->mode == RING_BUFFER_OVERWRITE) { |
513 | if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) { | |
514 | transport_name = "relay-overwrite-mmap"; | |
515 | } else { | |
516 | transport_name = "relay-overwrite-rt-mmap"; | |
517 | } | |
518 | } else { | |
519 | if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) { | |
520 | transport_name = "relay-discard-mmap"; | |
521 | } else { | |
522 | transport_name = "relay-discard-rt-mmap"; | |
523 | } | |
524 | } | |
f4681817 | 525 | } else { |
74d81a6c MD |
526 | ret = -EINVAL; |
527 | goto notransport; | |
f4681817 | 528 | } |
74d81a6c | 529 | chan_name = "channel"; |
f4681817 | 530 | break; |
f4681817 | 531 | default: |
74d81a6c MD |
532 | ret = -EINVAL; |
533 | goto notransport; | |
fe38d4af | 534 | } |
74d81a6c MD |
535 | transport = lttng_transport_find(transport_name); |
536 | if (!transport) { | |
537 | DBG("LTTng transport %s not found\n", | |
538 | transport_name); | |
539 | ret = -EINVAL; | |
540 | goto notransport; | |
541 | } | |
542 | ||
543 | chan_objd = objd_alloc(NULL, <tng_channel_ops, owner, chan_name); | |
fe38d4af MD |
544 | if (chan_objd < 0) { |
545 | ret = chan_objd; | |
546 | goto objd_error; | |
f4681817 | 547 | } |
74d81a6c MD |
548 | |
549 | /* Initialize our lttng chan */ | |
550 | lttng_chan->chan = chan; | |
ac6b4ac6 | 551 | lttng_chan->tstate = 1; |
74d81a6c MD |
552 | lttng_chan->enabled = 1; |
553 | lttng_chan->ctx = NULL; | |
554 | lttng_chan->session = session; | |
74d81a6c MD |
555 | lttng_chan->ops = &transport->ops; |
556 | memcpy(<tng_chan->chan->backend.config, | |
557 | transport->client_config, | |
558 | sizeof(lttng_chan->chan->backend.config)); | |
559 | cds_list_add(<tng_chan->node, &session->chan_head); | |
560 | lttng_chan->header_type = 0; | |
561 | lttng_chan->handle = channel_handle; | |
74d81a6c MD |
562 | lttng_chan->type = type; |
563 | ||
f4681817 MD |
564 | /* |
565 | * We tolerate no failure path after channel creation. It will stay | |
566 | * invariant for the rest of the session. | |
567 | */ | |
74d81a6c MD |
568 | objd_set_private(chan_objd, lttng_chan); |
569 | lttng_chan->objd = chan_objd; | |
f4681817 MD |
570 | /* The channel created holds a reference on the session */ |
571 | objd_ref(session_objd); | |
f4681817 MD |
572 | return chan_objd; |
573 | ||
ff0f5728 | 574 | /* error path after channel was created */ |
f4681817 | 575 | objd_error: |
74d81a6c | 576 | notransport: |
74d81a6c MD |
577 | alloc_error: |
578 | channel_destroy(chan, channel_handle, 0); | |
ff0f5728 MD |
579 | return ret; |
580 | ||
581 | /* | |
582 | * error path before channel creation (owning chan_data and | |
583 | * wakeup_fd). | |
584 | */ | |
74d81a6c MD |
585 | handle_error: |
586 | active: | |
ff0f5728 MD |
587 | invalid: |
588 | { | |
589 | int close_ret; | |
590 | ||
6548fca4 | 591 | lttng_ust_lock_fd_tracker(); |
ff0f5728 | 592 | close_ret = close(wakeup_fd); |
6548fca4 | 593 | lttng_ust_unlock_fd_tracker(); |
ff0f5728 MD |
594 | if (close_ret) { |
595 | PERROR("close"); | |
596 | } | |
597 | } | |
598 | free(chan_data); | |
f4681817 MD |
599 | return ret; |
600 | } | |
601 | ||
602 | /** | |
603 | * lttng_session_cmd - lttng session object command | |
604 | * | |
605 | * @obj: the object | |
606 | * @cmd: the command | |
607 | * @arg: command arg | |
ef9ff354 | 608 | * @uargs: UST arguments (internal) |
f59ed768 | 609 | * @owner: objd owner |
f4681817 MD |
610 | * |
611 | * This descriptor implements lttng commands: | |
612 | * LTTNG_UST_CHANNEL | |
613 | * Returns a LTTng channel object descriptor | |
614 | * LTTNG_UST_ENABLE | |
615 | * Enables tracing for a session (weak enable) | |
616 | * LTTNG_UST_DISABLE | |
617 | * Disables tracing for a session (strong disable) | |
f4681817 MD |
618 | * |
619 | * The returned channel will be deleted when its file descriptor is closed. | |
620 | */ | |
621 | static | |
ef9ff354 | 622 | long lttng_session_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 623 | union ust_args *uargs, void *owner) |
f4681817 | 624 | { |
7dd08bec | 625 | struct lttng_session *session = objd_private(objd); |
f4681817 MD |
626 | |
627 | switch (cmd) { | |
628 | case LTTNG_UST_CHANNEL: | |
74d81a6c | 629 | return lttng_abi_map_channel(objd, |
f4681817 | 630 | (struct lttng_ust_channel *) arg, |
74d81a6c | 631 | uargs, owner); |
f4681817 MD |
632 | case LTTNG_UST_SESSION_START: |
633 | case LTTNG_UST_ENABLE: | |
7dd08bec | 634 | return lttng_session_enable(session); |
f4681817 MD |
635 | case LTTNG_UST_SESSION_STOP: |
636 | case LTTNG_UST_DISABLE: | |
7dd08bec | 637 | return lttng_session_disable(session); |
710b8ee3 MD |
638 | case LTTNG_UST_SESSION_STATEDUMP: |
639 | return lttng_session_statedump(session); | |
f4681817 MD |
640 | default: |
641 | return -EINVAL; | |
642 | } | |
643 | } | |
644 | ||
645 | /* | |
646 | * Called when the last file reference is dropped. | |
647 | * | |
648 | * Big fat note: channels and events are invariant for the whole session after | |
649 | * their creation. So this session destruction also destroys all channel and | |
650 | * event structures specific to this session (they are not destroyed when their | |
651 | * individual file is released). | |
652 | */ | |
653 | static | |
1ea11eab | 654 | int lttng_release_session(int objd) |
f4681817 | 655 | { |
7dd08bec | 656 | struct lttng_session *session = objd_private(objd); |
f4681817 | 657 | |
1ea11eab | 658 | if (session) { |
7dd08bec | 659 | lttng_session_destroy(session); |
1ea11eab MD |
660 | return 0; |
661 | } else { | |
662 | return -EINVAL; | |
663 | } | |
f4681817 MD |
664 | } |
665 | ||
b61ce3b2 | 666 | static const struct lttng_ust_objd_ops lttng_session_ops = { |
1ea11eab | 667 | .release = lttng_release_session, |
f4681817 MD |
668 | .cmd = lttng_session_cmd, |
669 | }; | |
670 | ||
d8d2416d FD |
671 | static int lttng_ust_event_notifier_enabler_create(int event_notifier_group_obj, |
672 | void *owner, struct lttng_ust_event_notifier *event_notifier_param, | |
673 | enum lttng_enabler_format_type type) | |
674 | { | |
675 | struct lttng_event_notifier_group *event_notifier_group = | |
676 | objd_private(event_notifier_group_obj); | |
677 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
678 | int event_notifier_objd, ret; | |
679 | ||
680 | event_notifier_param->event.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
681 | event_notifier_objd = objd_alloc(NULL, <tng_event_notifier_enabler_ops, owner, | |
682 | "event_notifier enabler"); | |
683 | if (event_notifier_objd < 0) { | |
684 | ret = event_notifier_objd; | |
685 | goto objd_error; | |
686 | } | |
687 | ||
688 | event_notifier_enabler = lttng_event_notifier_enabler_create( | |
689 | event_notifier_group, type, event_notifier_param); | |
690 | if (!event_notifier_enabler) { | |
691 | ret = -ENOMEM; | |
692 | goto event_notifier_error; | |
693 | } | |
694 | ||
695 | objd_set_private(event_notifier_objd, event_notifier_enabler); | |
696 | /* The event_notifier holds a reference on the event_notifier group. */ | |
697 | objd_ref(event_notifier_enabler->group->objd); | |
698 | ||
699 | return event_notifier_objd; | |
700 | ||
701 | event_notifier_error: | |
702 | { | |
703 | int err; | |
704 | ||
705 | err = lttng_ust_objd_unref(event_notifier_objd, 1); | |
706 | assert(!err); | |
707 | } | |
708 | objd_error: | |
709 | return ret; | |
710 | } | |
711 | ||
712 | static | |
713 | long lttng_event_notifier_enabler_cmd(int objd, unsigned int cmd, unsigned long arg, | |
714 | union ust_args *uargs, void *owner) | |
715 | { | |
716 | struct lttng_event_notifier_enabler *event_notifier_enabler = objd_private(objd); | |
717 | switch (cmd) { | |
718 | case LTTNG_UST_FILTER: | |
a56fd376 FD |
719 | return lttng_event_notifier_enabler_attach_filter_bytecode( |
720 | event_notifier_enabler, | |
ab249ecf | 721 | (struct lttng_ust_bytecode_node *) arg); |
d8d2416d FD |
722 | case LTTNG_UST_EXCLUSION: |
723 | return lttng_event_notifier_enabler_attach_exclusion(event_notifier_enabler, | |
724 | (struct lttng_ust_excluder_node *) arg); | |
725 | case LTTNG_UST_ENABLE: | |
726 | return lttng_event_notifier_enabler_enable(event_notifier_enabler); | |
727 | case LTTNG_UST_DISABLE: | |
728 | return lttng_event_notifier_enabler_disable(event_notifier_enabler); | |
729 | default: | |
730 | return -EINVAL; | |
731 | } | |
732 | } | |
733 | ||
734 | static | |
735 | long lttng_event_notifier_group_cmd(int objd, unsigned int cmd, unsigned long arg, | |
736 | union ust_args *uargs, void *owner) | |
737 | { | |
738 | switch (cmd) { | |
739 | case LTTNG_UST_EVENT_NOTIFIER_CREATE: | |
740 | { | |
741 | struct lttng_ust_event_notifier *event_notifier_param = | |
742 | (struct lttng_ust_event_notifier *) arg; | |
743 | if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) { | |
744 | /* | |
745 | * If the event name is a star globbing pattern, | |
746 | * we create the special star globbing enabler. | |
747 | */ | |
748 | return lttng_ust_event_notifier_enabler_create(objd, | |
749 | owner, event_notifier_param, | |
750 | LTTNG_ENABLER_FORMAT_STAR_GLOB); | |
751 | } else { | |
752 | return lttng_ust_event_notifier_enabler_create(objd, | |
753 | owner, event_notifier_param, | |
754 | LTTNG_ENABLER_FORMAT_EVENT); | |
755 | } | |
756 | } | |
757 | default: | |
758 | return -EINVAL; | |
759 | } | |
760 | } | |
761 | ||
762 | static | |
763 | int lttng_event_notifier_enabler_release(int objd) | |
764 | { | |
765 | struct lttng_event_notifier_enabler *event_notifier_enabler = objd_private(objd); | |
766 | ||
767 | if (event_notifier_enabler) | |
768 | return lttng_ust_objd_unref(event_notifier_enabler->group->objd, 0); | |
769 | return 0; | |
770 | } | |
771 | ||
772 | static const struct lttng_ust_objd_ops lttng_event_notifier_enabler_ops = { | |
773 | .release = lttng_event_notifier_enabler_release, | |
774 | .cmd = lttng_event_notifier_enabler_cmd, | |
775 | }; | |
776 | ||
777 | static | |
778 | int lttng_release_event_notifier_group(int objd) | |
779 | { | |
780 | struct lttng_event_notifier_group *event_notifier_group = objd_private(objd); | |
781 | ||
782 | if (event_notifier_group) { | |
783 | lttng_event_notifier_group_destroy(event_notifier_group); | |
784 | return 0; | |
785 | } else { | |
786 | return -EINVAL; | |
787 | } | |
788 | } | |
789 | ||
790 | static const struct lttng_ust_objd_ops lttng_event_notifier_group_ops = { | |
791 | .release = lttng_release_event_notifier_group, | |
792 | .cmd = lttng_event_notifier_group_cmd, | |
793 | }; | |
794 | ||
51489cad | 795 | static |
ef9ff354 | 796 | long lttng_tracepoint_list_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 797 | union ust_args *uargs, void *owner) |
51489cad | 798 | { |
c8fcf224 | 799 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
cbef6901 MD |
800 | struct lttng_ust_tracepoint_iter *tp = |
801 | (struct lttng_ust_tracepoint_iter *) arg; | |
c8fcf224 | 802 | struct lttng_ust_tracepoint_iter *iter; |
51489cad MD |
803 | |
804 | switch (cmd) { | |
805 | case LTTNG_UST_TRACEPOINT_LIST_GET: | |
c8fcf224 | 806 | { |
c8fcf224 MD |
807 | iter = lttng_ust_tracepoint_list_get_iter_next(list); |
808 | if (!iter) | |
7bc53e94 | 809 | return -LTTNG_UST_ERR_NOENT; |
c8fcf224 | 810 | memcpy(tp, iter, sizeof(*tp)); |
51489cad | 811 | return 0; |
c8fcf224 | 812 | } |
51489cad MD |
813 | default: |
814 | return -EINVAL; | |
815 | } | |
816 | } | |
817 | ||
818 | static | |
f59ed768 | 819 | int lttng_abi_tracepoint_list(void *owner) |
51489cad MD |
820 | { |
821 | int list_objd, ret; | |
c8fcf224 | 822 | struct lttng_ust_tracepoint_list *list; |
51489cad | 823 | |
7047f3da | 824 | list_objd = objd_alloc(NULL, <tng_tracepoint_list_ops, owner, "tp_list"); |
51489cad MD |
825 | if (list_objd < 0) { |
826 | ret = list_objd; | |
827 | goto objd_error; | |
828 | } | |
829 | list = zmalloc(sizeof(*list)); | |
830 | if (!list) { | |
831 | ret = -ENOMEM; | |
832 | goto alloc_error; | |
833 | } | |
834 | objd_set_private(list_objd, list); | |
835 | ||
c8fcf224 | 836 | /* populate list by walking on all registered probes. */ |
7dd08bec | 837 | ret = lttng_probes_get_event_list(list); |
c8fcf224 MD |
838 | if (ret) { |
839 | goto list_error; | |
840 | } | |
51489cad MD |
841 | return list_objd; |
842 | ||
c8fcf224 MD |
843 | list_error: |
844 | free(list); | |
51489cad MD |
845 | alloc_error: |
846 | { | |
847 | int err; | |
848 | ||
1849ef7c | 849 | err = lttng_ust_objd_unref(list_objd, 1); |
51489cad MD |
850 | assert(!err); |
851 | } | |
852 | objd_error: | |
853 | return ret; | |
854 | } | |
855 | ||
856 | static | |
857 | int lttng_release_tracepoint_list(int objd) | |
858 | { | |
c8fcf224 | 859 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
51489cad MD |
860 | |
861 | if (list) { | |
7dd08bec | 862 | lttng_probes_prune_event_list(list); |
51489cad MD |
863 | free(list); |
864 | return 0; | |
865 | } else { | |
866 | return -EINVAL; | |
867 | } | |
868 | } | |
869 | ||
870 | static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops = { | |
871 | .release = lttng_release_tracepoint_list, | |
872 | .cmd = lttng_tracepoint_list_cmd, | |
873 | }; | |
874 | ||
06d4f27e MD |
875 | static |
876 | long lttng_tracepoint_field_list_cmd(int objd, unsigned int cmd, | |
f59ed768 | 877 | unsigned long arg, union ust_args *uargs, void *owner) |
06d4f27e MD |
878 | { |
879 | struct lttng_ust_field_list *list = objd_private(objd); | |
40003310 | 880 | struct lttng_ust_field_iter *tp = &uargs->field_list.entry; |
06d4f27e MD |
881 | struct lttng_ust_field_iter *iter; |
882 | ||
883 | switch (cmd) { | |
884 | case LTTNG_UST_TRACEPOINT_FIELD_LIST_GET: | |
885 | { | |
06d4f27e MD |
886 | iter = lttng_ust_field_list_get_iter_next(list); |
887 | if (!iter) | |
7bc53e94 | 888 | return -LTTNG_UST_ERR_NOENT; |
06d4f27e MD |
889 | memcpy(tp, iter, sizeof(*tp)); |
890 | return 0; | |
891 | } | |
892 | default: | |
893 | return -EINVAL; | |
894 | } | |
895 | } | |
896 | ||
897 | static | |
f59ed768 | 898 | int lttng_abi_tracepoint_field_list(void *owner) |
06d4f27e MD |
899 | { |
900 | int list_objd, ret; | |
901 | struct lttng_ust_field_list *list; | |
902 | ||
7047f3da MD |
903 | list_objd = objd_alloc(NULL, <tng_tracepoint_field_list_ops, owner, |
904 | "tp_field_list"); | |
06d4f27e MD |
905 | if (list_objd < 0) { |
906 | ret = list_objd; | |
907 | goto objd_error; | |
908 | } | |
909 | list = zmalloc(sizeof(*list)); | |
910 | if (!list) { | |
911 | ret = -ENOMEM; | |
912 | goto alloc_error; | |
913 | } | |
914 | objd_set_private(list_objd, list); | |
915 | ||
916 | /* populate list by walking on all registered probes. */ | |
7dd08bec | 917 | ret = lttng_probes_get_field_list(list); |
06d4f27e MD |
918 | if (ret) { |
919 | goto list_error; | |
920 | } | |
921 | return list_objd; | |
922 | ||
923 | list_error: | |
924 | free(list); | |
925 | alloc_error: | |
926 | { | |
927 | int err; | |
928 | ||
1849ef7c | 929 | err = lttng_ust_objd_unref(list_objd, 1); |
06d4f27e MD |
930 | assert(!err); |
931 | } | |
932 | objd_error: | |
933 | return ret; | |
934 | } | |
935 | ||
936 | static | |
937 | int lttng_release_tracepoint_field_list(int objd) | |
938 | { | |
939 | struct lttng_ust_field_list *list = objd_private(objd); | |
940 | ||
941 | if (list) { | |
7dd08bec | 942 | lttng_probes_prune_field_list(list); |
06d4f27e MD |
943 | free(list); |
944 | return 0; | |
945 | } else { | |
946 | return -EINVAL; | |
947 | } | |
948 | } | |
949 | ||
950 | static const struct lttng_ust_objd_ops lttng_tracepoint_field_list_ops = { | |
951 | .release = lttng_release_tracepoint_field_list, | |
952 | .cmd = lttng_tracepoint_field_list_cmd, | |
953 | }; | |
954 | ||
f4681817 | 955 | static |
74d81a6c | 956 | int lttng_abi_map_stream(int channel_objd, struct lttng_ust_stream *info, |
f59ed768 | 957 | union ust_args *uargs, void *owner) |
f4681817 | 958 | { |
7dd08bec | 959 | struct lttng_channel *channel = objd_private(channel_objd); |
74d81a6c | 960 | int ret; |
f4681817 | 961 | |
74d81a6c MD |
962 | ret = channel_handle_add_stream(channel->handle, |
963 | uargs->stream.shm_fd, uargs->stream.wakeup_fd, | |
964 | info->stream_nr, info->len); | |
965 | if (ret) | |
966 | goto error_add_stream; | |
967 | ||
968 | return 0; | |
969 | ||
970 | error_add_stream: | |
f4681817 MD |
971 | return ret; |
972 | } | |
f4681817 MD |
973 | |
974 | static | |
d871c65b | 975 | int lttng_abi_create_event_enabler(int channel_objd, |
f59ed768 | 976 | struct lttng_ust_event *event_param, |
e58095ef | 977 | void *owner, |
e450e339 | 978 | enum lttng_enabler_format_type format_type) |
f4681817 | 979 | { |
7dd08bec | 980 | struct lttng_channel *channel = objd_private(channel_objd); |
d871c65b | 981 | struct lttng_event_enabler *enabler; |
f4681817 MD |
982 | int event_objd, ret; |
983 | ||
984 | event_param->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
d871c65b FD |
985 | event_objd = objd_alloc(NULL, <tng_event_enabler_ops, owner, |
986 | "event enabler"); | |
f4681817 MD |
987 | if (event_objd < 0) { |
988 | ret = event_objd; | |
989 | goto objd_error; | |
990 | } | |
991 | /* | |
992 | * We tolerate no failure path after event creation. It will stay | |
993 | * invariant for the rest of the session. | |
994 | */ | |
d871c65b | 995 | enabler = lttng_event_enabler_create(format_type, event_param, channel); |
e58095ef MD |
996 | if (!enabler) { |
997 | ret = -ENOMEM; | |
f4681817 MD |
998 | goto event_error; |
999 | } | |
e58095ef | 1000 | objd_set_private(event_objd, enabler); |
f4681817 MD |
1001 | /* The event holds a reference on the channel */ |
1002 | objd_ref(channel_objd); | |
1003 | return event_objd; | |
1004 | ||
1005 | event_error: | |
1ea11eab MD |
1006 | { |
1007 | int err; | |
1008 | ||
1849ef7c | 1009 | err = lttng_ust_objd_unref(event_objd, 1); |
1ea11eab MD |
1010 | assert(!err); |
1011 | } | |
f4681817 MD |
1012 | objd_error: |
1013 | return ret; | |
1014 | } | |
1015 | ||
1016 | /** | |
1017 | * lttng_channel_cmd - lttng control through object descriptors | |
1018 | * | |
1019 | * @objd: the object descriptor | |
1020 | * @cmd: the command | |
1021 | * @arg: command arg | |
ef9ff354 | 1022 | * @uargs: UST arguments (internal) |
f59ed768 | 1023 | * @owner: objd owner |
f4681817 MD |
1024 | * |
1025 | * This object descriptor implements lttng commands: | |
1026 | * LTTNG_UST_STREAM | |
1027 | * Returns an event stream object descriptor or failure. | |
1028 | * (typically, one event stream records events from one CPU) | |
1029 | * LTTNG_UST_EVENT | |
1030 | * Returns an event object descriptor or failure. | |
1031 | * LTTNG_UST_CONTEXT | |
1032 | * Prepend a context field to each event in the channel | |
1033 | * LTTNG_UST_ENABLE | |
1034 | * Enable recording for events in this channel (weak enable) | |
1035 | * LTTNG_UST_DISABLE | |
1036 | * Disable recording for events in this channel (strong disable) | |
1037 | * | |
1038 | * Channel and event file descriptors also hold a reference on the session. | |
1039 | */ | |
1040 | static | |
ef9ff354 | 1041 | long lttng_channel_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 1042 | union ust_args *uargs, void *owner) |
f4681817 | 1043 | { |
7dd08bec | 1044 | struct lttng_channel *channel = objd_private(objd); |
f4681817 | 1045 | |
74d81a6c MD |
1046 | if (cmd != LTTNG_UST_STREAM) { |
1047 | /* | |
1048 | * Check if channel received all streams. | |
1049 | */ | |
1050 | if (!lttng_is_channel_ready(channel)) | |
1051 | return -EPERM; | |
1052 | } | |
1053 | ||
f4681817 MD |
1054 | switch (cmd) { |
1055 | case LTTNG_UST_STREAM: | |
381c0f1e MD |
1056 | { |
1057 | struct lttng_ust_stream *stream; | |
1058 | ||
1059 | stream = (struct lttng_ust_stream *) arg; | |
1060 | /* stream used as output */ | |
74d81a6c | 1061 | return lttng_abi_map_stream(objd, stream, uargs, owner); |
381c0f1e | 1062 | } |
f4681817 | 1063 | case LTTNG_UST_EVENT: |
1f18504e MD |
1064 | { |
1065 | struct lttng_ust_event *event_param = | |
1066 | (struct lttng_ust_event *) arg; | |
196ec2df PP |
1067 | |
1068 | if (strutils_is_star_glob_pattern(event_param->name)) { | |
1069 | /* | |
1070 | * If the event name is a star globbing pattern, | |
1071 | * we create the special star globbing enabler. | |
1072 | */ | |
d871c65b | 1073 | return lttng_abi_create_event_enabler(objd, event_param, |
e450e339 | 1074 | owner, LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f18504e | 1075 | } else { |
d871c65b | 1076 | return lttng_abi_create_event_enabler(objd, event_param, |
e450e339 | 1077 | owner, LTTNG_ENABLER_FORMAT_EVENT); |
1f18504e MD |
1078 | } |
1079 | } | |
f4681817 MD |
1080 | case LTTNG_UST_CONTEXT: |
1081 | return lttng_abi_add_context(objd, | |
8e696cfa | 1082 | (struct lttng_ust_context *) arg, uargs, |
f4681817 MD |
1083 | &channel->ctx, channel->session); |
1084 | case LTTNG_UST_ENABLE: | |
7dd08bec | 1085 | return lttng_channel_enable(channel); |
f4681817 | 1086 | case LTTNG_UST_DISABLE: |
7dd08bec | 1087 | return lttng_channel_disable(channel); |
43d330a4 MD |
1088 | case LTTNG_UST_FLUSH_BUFFER: |
1089 | return channel->ops->flush_buffer(channel->chan, channel->handle); | |
f4681817 MD |
1090 | default: |
1091 | return -EINVAL; | |
1092 | } | |
1093 | } | |
1094 | ||
f4681817 MD |
1095 | static |
1096 | int lttng_channel_release(int objd) | |
1097 | { | |
7dd08bec | 1098 | struct lttng_channel *channel = objd_private(objd); |
f4681817 MD |
1099 | |
1100 | if (channel) | |
1849ef7c | 1101 | return lttng_ust_objd_unref(channel->session->objd, 0); |
f4681817 MD |
1102 | return 0; |
1103 | } | |
1104 | ||
b61ce3b2 | 1105 | static const struct lttng_ust_objd_ops lttng_channel_ops = { |
f4681817 | 1106 | .release = lttng_channel_release, |
f4681817 MD |
1107 | .cmd = lttng_channel_cmd, |
1108 | }; | |
1109 | ||
f4681817 | 1110 | /** |
e58095ef | 1111 | * lttng_enabler_cmd - lttng control through object descriptors |
e6c12e3d MD |
1112 | * |
1113 | * @objd: the object descriptor | |
1114 | * @cmd: the command | |
1115 | * @arg: command arg | |
ef9ff354 | 1116 | * @uargs: UST arguments (internal) |
f59ed768 | 1117 | * @owner: objd owner |
e6c12e3d MD |
1118 | * |
1119 | * This object descriptor implements lttng commands: | |
1120 | * LTTNG_UST_CONTEXT | |
1121 | * Prepend a context field to each record of events of this | |
e58095ef | 1122 | * enabler. |
e6c12e3d | 1123 | * LTTNG_UST_ENABLE |
e58095ef | 1124 | * Enable recording for this enabler |
e6c12e3d | 1125 | * LTTNG_UST_DISABLE |
e58095ef | 1126 | * Disable recording for this enabler |
2d78951a | 1127 | * LTTNG_UST_FILTER |
e58095ef | 1128 | * Attach a filter to an enabler. |
0bfb5cbd JI |
1129 | * LTTNG_UST_EXCLUSION |
1130 | * Attach exclusions to an enabler. | |
e6c12e3d MD |
1131 | */ |
1132 | static | |
d871c65b | 1133 | long lttng_event_enabler_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 1134 | union ust_args *uargs, void *owner) |
e6c12e3d | 1135 | { |
d871c65b | 1136 | struct lttng_event_enabler *enabler = objd_private(objd); |
e6c12e3d MD |
1137 | |
1138 | switch (cmd) { | |
1139 | case LTTNG_UST_CONTEXT: | |
d871c65b | 1140 | return lttng_event_enabler_attach_context(enabler, |
e58095ef | 1141 | (struct lttng_ust_context *) arg); |
e6c12e3d | 1142 | case LTTNG_UST_ENABLE: |
d871c65b | 1143 | return lttng_event_enabler_enable(enabler); |
e6c12e3d | 1144 | case LTTNG_UST_DISABLE: |
d871c65b | 1145 | return lttng_event_enabler_disable(enabler); |
2d78951a MD |
1146 | case LTTNG_UST_FILTER: |
1147 | { | |
1148 | int ret; | |
1149 | ||
a56fd376 | 1150 | ret = lttng_event_enabler_attach_filter_bytecode(enabler, |
ab249ecf | 1151 | (struct lttng_ust_bytecode_node *) arg); |
2d78951a MD |
1152 | if (ret) |
1153 | return ret; | |
2d78951a MD |
1154 | return 0; |
1155 | } | |
0bfb5cbd JI |
1156 | case LTTNG_UST_EXCLUSION: |
1157 | { | |
d871c65b | 1158 | return lttng_event_enabler_attach_exclusion(enabler, |
0bfb5cbd JI |
1159 | (struct lttng_ust_excluder_node *) arg); |
1160 | } | |
e6c12e3d MD |
1161 | default: |
1162 | return -EINVAL; | |
1163 | } | |
1164 | } | |
1165 | ||
1166 | static | |
d871c65b | 1167 | int lttng_event_enabler_release(int objd) |
e6c12e3d | 1168 | { |
d871c65b FD |
1169 | struct lttng_event_enabler *event_enabler = objd_private(objd); |
1170 | ||
1171 | if (event_enabler) | |
1172 | return lttng_ust_objd_unref(event_enabler->chan->objd, 0); | |
e6c12e3d | 1173 | |
e6c12e3d MD |
1174 | return 0; |
1175 | } | |
1176 | ||
d871c65b FD |
1177 | static const struct lttng_ust_objd_ops lttng_event_enabler_ops = { |
1178 | .release = lttng_event_enabler_release, | |
1179 | .cmd = lttng_event_enabler_cmd, | |
e6c12e3d MD |
1180 | }; |
1181 | ||
b35d179d | 1182 | void lttng_ust_abi_exit(void) |
f4681817 | 1183 | { |
45e9e699 | 1184 | lttng_ust_abi_close_in_progress = 1; |
701a658f | 1185 | ust_lock_nocheck(); |
f4681817 | 1186 | objd_table_destroy(); |
701a658f | 1187 | ust_unlock(); |
45e9e699 | 1188 | lttng_ust_abi_close_in_progress = 0; |
f4681817 | 1189 | } |