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" | |
ebabbf58 | 59 | #include "../libcounter/counter.h" |
7dd08bec | 60 | #include "lttng-tracer.h" |
196ec2df | 61 | #include "string-utils.h" |
d871c65b | 62 | #include "ust-events-internal.h" |
4ab44fbe | 63 | |
7047f3da MD |
64 | #define OBJ_NAME_LEN 16 |
65 | ||
45e9e699 MD |
66 | static int lttng_ust_abi_close_in_progress; |
67 | ||
51489cad | 68 | static |
f59ed768 | 69 | int lttng_abi_tracepoint_list(void *owner); |
06d4f27e | 70 | static |
f59ed768 | 71 | int lttng_abi_tracepoint_field_list(void *owner); |
51489cad | 72 | |
f4681817 MD |
73 | /* |
74 | * Object descriptor table. Should be protected from concurrent access | |
75 | * by the caller. | |
76 | */ | |
77 | ||
b61ce3b2 | 78 | struct lttng_ust_obj { |
f4681817 MD |
79 | union { |
80 | struct { | |
81 | void *private_data; | |
b61ce3b2 | 82 | const struct lttng_ust_objd_ops *ops; |
f4681817 | 83 | int f_count; |
1849ef7c | 84 | int owner_ref; /* has ref from owner */ |
f59ed768 | 85 | void *owner; |
7047f3da | 86 | char name[OBJ_NAME_LEN]; |
f4681817 MD |
87 | } s; |
88 | int freelist_next; /* offset freelist. end is -1. */ | |
89 | } u; | |
90 | }; | |
91 | ||
b61ce3b2 MD |
92 | struct lttng_ust_objd_table { |
93 | struct lttng_ust_obj *array; | |
f4681817 MD |
94 | unsigned int len, allocated_len; |
95 | int freelist_head; /* offset freelist head. end is -1 */ | |
96 | }; | |
97 | ||
b61ce3b2 | 98 | static struct lttng_ust_objd_table objd_table = { |
f4681817 MD |
99 | .freelist_head = -1, |
100 | }; | |
101 | ||
102 | static | |
f59ed768 | 103 | int objd_alloc(void *private_data, const struct lttng_ust_objd_ops *ops, |
7047f3da | 104 | void *owner, const char *name) |
f4681817 | 105 | { |
b61ce3b2 | 106 | struct lttng_ust_obj *obj; |
f4681817 MD |
107 | |
108 | if (objd_table.freelist_head != -1) { | |
109 | obj = &objd_table.array[objd_table.freelist_head]; | |
110 | objd_table.freelist_head = obj->u.freelist_next; | |
111 | goto end; | |
112 | } | |
113 | ||
114 | if (objd_table.len >= objd_table.allocated_len) { | |
115 | unsigned int new_allocated_len, old_allocated_len; | |
b61ce3b2 | 116 | struct lttng_ust_obj *new_table, *old_table; |
f4681817 MD |
117 | |
118 | old_allocated_len = objd_table.allocated_len; | |
119 | old_table = objd_table.array; | |
120 | if (!old_allocated_len) | |
121 | new_allocated_len = 1; | |
122 | else | |
123 | new_allocated_len = old_allocated_len << 1; | |
b61ce3b2 | 124 | new_table = zmalloc(sizeof(struct lttng_ust_obj) * new_allocated_len); |
f4681817 MD |
125 | if (!new_table) |
126 | return -ENOMEM; | |
127 | memcpy(new_table, old_table, | |
b61ce3b2 | 128 | sizeof(struct lttng_ust_obj) * old_allocated_len); |
f4681817 MD |
129 | free(old_table); |
130 | objd_table.array = new_table; | |
131 | objd_table.allocated_len = new_allocated_len; | |
132 | } | |
133 | obj = &objd_table.array[objd_table.len]; | |
134 | objd_table.len++; | |
135 | end: | |
136 | obj->u.s.private_data = private_data; | |
137 | obj->u.s.ops = ops; | |
a4be8962 MD |
138 | obj->u.s.f_count = 2; /* count == 1 : object is allocated */ |
139 | /* count == 2 : allocated + hold ref */ | |
1849ef7c | 140 | obj->u.s.owner_ref = 1; /* One owner reference */ |
f59ed768 | 141 | obj->u.s.owner = owner; |
7047f3da MD |
142 | strncpy(obj->u.s.name, name, OBJ_NAME_LEN); |
143 | obj->u.s.name[OBJ_NAME_LEN - 1] = '\0'; | |
f4681817 MD |
144 | return obj - objd_table.array; |
145 | } | |
146 | ||
147 | static | |
b61ce3b2 | 148 | struct lttng_ust_obj *_objd_get(int id) |
f4681817 MD |
149 | { |
150 | if (id >= objd_table.len) | |
151 | return NULL; | |
a4be8962 MD |
152 | if (!objd_table.array[id].u.s.f_count) |
153 | return NULL; | |
f4681817 MD |
154 | return &objd_table.array[id]; |
155 | } | |
156 | ||
157 | static | |
158 | void *objd_private(int id) | |
159 | { | |
b61ce3b2 | 160 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
161 | assert(obj); |
162 | return obj->u.s.private_data; | |
163 | } | |
164 | ||
165 | static | |
166 | void objd_set_private(int id, void *private_data) | |
167 | { | |
b61ce3b2 | 168 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
169 | assert(obj); |
170 | obj->u.s.private_data = private_data; | |
171 | } | |
172 | ||
b61ce3b2 | 173 | const struct lttng_ust_objd_ops *objd_ops(int id) |
f4681817 | 174 | { |
b61ce3b2 | 175 | struct lttng_ust_obj *obj = _objd_get(id); |
46050b1a | 176 | |
a4be8962 MD |
177 | if (!obj) |
178 | return NULL; | |
f4681817 MD |
179 | return obj->u.s.ops; |
180 | } | |
181 | ||
182 | static | |
183 | void objd_free(int id) | |
184 | { | |
b61ce3b2 | 185 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
186 | |
187 | assert(obj); | |
188 | obj->u.freelist_next = objd_table.freelist_head; | |
189 | objd_table.freelist_head = obj - objd_table.array; | |
a4be8962 MD |
190 | assert(obj->u.s.f_count == 1); |
191 | obj->u.s.f_count = 0; /* deallocated */ | |
f4681817 MD |
192 | } |
193 | ||
194 | static | |
195 | void objd_ref(int id) | |
196 | { | |
b61ce3b2 | 197 | struct lttng_ust_obj *obj = _objd_get(id); |
072886c4 | 198 | assert(obj != NULL); |
f4681817 MD |
199 | obj->u.s.f_count++; |
200 | } | |
201 | ||
1849ef7c | 202 | int lttng_ust_objd_unref(int id, int is_owner) |
f4681817 | 203 | { |
b61ce3b2 | 204 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 | 205 | |
1ea11eab MD |
206 | if (!obj) |
207 | return -EINVAL; | |
a4be8962 MD |
208 | if (obj->u.s.f_count == 1) { |
209 | ERR("Reference counting error\n"); | |
210 | return -EINVAL; | |
211 | } | |
1849ef7c MD |
212 | if (is_owner) { |
213 | if (!obj->u.s.owner_ref) { | |
214 | ERR("Error decrementing owner reference"); | |
215 | return -EINVAL; | |
216 | } | |
217 | obj->u.s.owner_ref--; | |
218 | } | |
a4be8962 | 219 | if ((--obj->u.s.f_count) == 1) { |
b61ce3b2 | 220 | const struct lttng_ust_objd_ops *ops = objd_ops(id); |
196ec2df | 221 | |
f4681817 MD |
222 | if (ops->release) |
223 | ops->release(id); | |
224 | objd_free(id); | |
225 | } | |
1ea11eab | 226 | return 0; |
f4681817 MD |
227 | } |
228 | ||
229 | static | |
230 | void objd_table_destroy(void) | |
231 | { | |
a4be8962 MD |
232 | int i; |
233 | ||
1849ef7c MD |
234 | for (i = 0; i < objd_table.allocated_len; i++) { |
235 | struct lttng_ust_obj *obj; | |
236 | ||
237 | obj = _objd_get(i); | |
238 | if (!obj) | |
239 | continue; | |
240 | if (!obj->u.s.owner_ref) | |
241 | continue; /* only unref owner ref. */ | |
242 | (void) lttng_ust_objd_unref(i, 1); | |
243 | } | |
f4681817 | 244 | free(objd_table.array); |
02fb3381 MD |
245 | objd_table.array = NULL; |
246 | objd_table.len = 0; | |
247 | objd_table.allocated_len = 0; | |
17dfb34b | 248 | objd_table.freelist_head = -1; |
f4681817 MD |
249 | } |
250 | ||
74d81a6c MD |
251 | const char *lttng_ust_obj_get_name(int id) |
252 | { | |
253 | struct lttng_ust_obj *obj = _objd_get(id); | |
254 | ||
255 | if (!obj) | |
256 | return NULL; | |
257 | return obj->u.s.name; | |
258 | } | |
259 | ||
f59ed768 MD |
260 | void lttng_ust_objd_table_owner_cleanup(void *owner) |
261 | { | |
262 | int i; | |
263 | ||
264 | for (i = 0; i < objd_table.allocated_len; i++) { | |
265 | struct lttng_ust_obj *obj; | |
266 | ||
267 | obj = _objd_get(i); | |
268 | if (!obj) | |
269 | continue; | |
270 | if (!obj->u.s.owner) | |
271 | continue; /* skip root handles */ | |
1849ef7c MD |
272 | if (!obj->u.s.owner_ref) |
273 | continue; /* only unref owner ref. */ | |
f59ed768 | 274 | if (obj->u.s.owner == owner) |
1849ef7c | 275 | (void) lttng_ust_objd_unref(i, 1); |
f59ed768 MD |
276 | } |
277 | } | |
278 | ||
f4681817 MD |
279 | /* |
280 | * This is LTTng's own personal way to create an ABI for sessiond. | |
281 | * We send commands over a socket. | |
282 | */ | |
283 | ||
b61ce3b2 | 284 | static const struct lttng_ust_objd_ops lttng_ops; |
d8d2416d | 285 | static const struct lttng_ust_objd_ops lttng_event_notifier_group_ops; |
b61ce3b2 MD |
286 | static const struct lttng_ust_objd_ops lttng_session_ops; |
287 | static const struct lttng_ust_objd_ops lttng_channel_ops; | |
d871c65b | 288 | static const struct lttng_ust_objd_ops lttng_event_enabler_ops; |
d8d2416d | 289 | static const struct lttng_ust_objd_ops lttng_event_notifier_enabler_ops; |
51489cad | 290 | static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops; |
06d4f27e | 291 | static const struct lttng_ust_objd_ops lttng_tracepoint_field_list_ops; |
f4681817 | 292 | |
46050b1a MD |
293 | int lttng_abi_create_root_handle(void) |
294 | { | |
295 | int root_handle; | |
296 | ||
f59ed768 | 297 | /* root handles have NULL owners */ |
7047f3da | 298 | root_handle = objd_alloc(NULL, <tng_ops, NULL, "root"); |
46050b1a MD |
299 | return root_handle; |
300 | } | |
301 | ||
74d81a6c MD |
302 | static |
303 | int lttng_is_channel_ready(struct lttng_channel *lttng_chan) | |
304 | { | |
305 | struct channel *chan; | |
306 | unsigned int nr_streams, exp_streams; | |
307 | ||
308 | chan = lttng_chan->chan; | |
309 | nr_streams = channel_handle_get_nr_streams(lttng_chan->handle); | |
310 | exp_streams = chan->nr_streams; | |
311 | return nr_streams == exp_streams; | |
312 | } | |
313 | ||
818173b9 | 314 | static |
f59ed768 | 315 | int lttng_abi_create_session(void *owner) |
f4681817 | 316 | { |
7dd08bec | 317 | struct lttng_session *session; |
f4681817 MD |
318 | int session_objd, ret; |
319 | ||
7dd08bec | 320 | session = lttng_session_create(); |
f4681817 MD |
321 | if (!session) |
322 | return -ENOMEM; | |
7047f3da | 323 | session_objd = objd_alloc(session, <tng_session_ops, owner, "session"); |
f4681817 MD |
324 | if (session_objd < 0) { |
325 | ret = session_objd; | |
326 | goto objd_error; | |
327 | } | |
328 | session->objd = session_objd; | |
32ce8569 | 329 | session->owner = owner; |
f4681817 MD |
330 | return session_objd; |
331 | ||
332 | objd_error: | |
7dd08bec | 333 | lttng_session_destroy(session); |
f4681817 MD |
334 | return ret; |
335 | } | |
336 | ||
f4681817 MD |
337 | static |
338 | long lttng_abi_tracer_version(int objd, | |
339 | struct lttng_ust_tracer_version *v) | |
340 | { | |
32ce8569 MD |
341 | v->major = LTTNG_UST_MAJOR_VERSION; |
342 | v->minor = LTTNG_UST_MINOR_VERSION; | |
343 | v->patchlevel = LTTNG_UST_PATCHLEVEL_VERSION; | |
f4681817 MD |
344 | return 0; |
345 | } | |
346 | ||
d8d2416d FD |
347 | static |
348 | int lttng_abi_event_notifier_send_fd(void *owner, int event_notifier_notif_fd) | |
349 | { | |
350 | struct lttng_event_notifier_group *event_notifier_group; | |
351 | int event_notifier_group_objd, ret, fd_flag, close_ret; | |
352 | ||
353 | event_notifier_group = lttng_event_notifier_group_create(); | |
354 | if (!event_notifier_group) | |
355 | return -ENOMEM; | |
356 | ||
357 | /* | |
358 | * Set this file descriptor as NON-BLOCKING. | |
359 | */ | |
360 | fd_flag = fcntl(event_notifier_notif_fd, F_GETFL); | |
361 | ||
362 | fd_flag |= O_NONBLOCK; | |
363 | ||
364 | ret = fcntl(event_notifier_notif_fd, F_SETFL, fd_flag); | |
365 | if (ret) { | |
366 | ret = -errno; | |
367 | goto fd_error; | |
368 | } | |
369 | ||
370 | event_notifier_group_objd = objd_alloc(event_notifier_group, | |
371 | <tng_event_notifier_group_ops, owner, "event_notifier_group"); | |
372 | if (event_notifier_group_objd < 0) { | |
373 | ret = event_notifier_group_objd; | |
374 | goto objd_error; | |
375 | } | |
376 | ||
377 | event_notifier_group->objd = event_notifier_group_objd; | |
378 | event_notifier_group->owner = owner; | |
379 | event_notifier_group->notification_fd = event_notifier_notif_fd; | |
380 | ||
381 | return event_notifier_group_objd; | |
382 | ||
383 | objd_error: | |
384 | lttng_event_notifier_group_destroy(event_notifier_group); | |
385 | fd_error: | |
386 | close_ret = close(event_notifier_notif_fd); | |
387 | if (close_ret) { | |
388 | PERROR("close"); | |
389 | } | |
390 | ||
391 | return ret; | |
392 | } | |
393 | ||
f4681817 MD |
394 | static |
395 | long lttng_abi_add_context(int objd, | |
396 | struct lttng_ust_context *context_param, | |
8e696cfa | 397 | union ust_args *uargs, |
7dd08bec | 398 | struct lttng_ctx **ctx, struct lttng_session *session) |
f4681817 | 399 | { |
8e696cfa | 400 | return lttng_attach_context(context_param, uargs, ctx, session); |
f4681817 MD |
401 | } |
402 | ||
403 | /** | |
404 | * lttng_cmd - lttng control through socket commands | |
405 | * | |
406 | * @objd: the object descriptor | |
407 | * @cmd: the command | |
408 | * @arg: command arg | |
ef9ff354 | 409 | * @uargs: UST arguments (internal) |
f59ed768 | 410 | * @owner: objd owner |
f4681817 MD |
411 | * |
412 | * This descriptor implements lttng commands: | |
413 | * LTTNG_UST_SESSION | |
414 | * Returns a LTTng trace session object descriptor | |
415 | * LTTNG_UST_TRACER_VERSION | |
416 | * Returns the LTTng kernel tracer version | |
417 | * LTTNG_UST_TRACEPOINT_LIST | |
418 | * Returns a file descriptor listing available tracepoints | |
06d4f27e MD |
419 | * LTTNG_UST_TRACEPOINT_FIELD_LIST |
420 | * Returns a file descriptor listing available tracepoint fields | |
f4681817 MD |
421 | * LTTNG_UST_WAIT_QUIESCENT |
422 | * Returns after all previously running probes have completed | |
423 | * | |
424 | * The returned session will be deleted when its file descriptor is closed. | |
425 | */ | |
426 | static | |
ef9ff354 | 427 | long lttng_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 428 | union ust_args *uargs, void *owner) |
f4681817 MD |
429 | { |
430 | switch (cmd) { | |
431 | case LTTNG_UST_SESSION: | |
f59ed768 | 432 | return lttng_abi_create_session(owner); |
f4681817 MD |
433 | case LTTNG_UST_TRACER_VERSION: |
434 | return lttng_abi_tracer_version(objd, | |
435 | (struct lttng_ust_tracer_version *) arg); | |
436 | case LTTNG_UST_TRACEPOINT_LIST: | |
f59ed768 | 437 | return lttng_abi_tracepoint_list(owner); |
06d4f27e | 438 | case LTTNG_UST_TRACEPOINT_FIELD_LIST: |
f59ed768 | 439 | return lttng_abi_tracepoint_field_list(owner); |
f4681817 MD |
440 | case LTTNG_UST_WAIT_QUIESCENT: |
441 | synchronize_trace(); | |
442 | return 0; | |
d8d2416d FD |
443 | case LTTNG_UST_EVENT_NOTIFIER_GROUP_CREATE: |
444 | return lttng_abi_event_notifier_send_fd(owner, | |
445 | uargs->event_notifier_handle.event_notifier_notif_fd); | |
f4681817 MD |
446 | default: |
447 | return -EINVAL; | |
448 | } | |
449 | } | |
450 | ||
b61ce3b2 | 451 | static const struct lttng_ust_objd_ops lttng_ops = { |
f4681817 MD |
452 | .cmd = lttng_cmd, |
453 | }; | |
454 | ||
74d81a6c MD |
455 | int lttng_abi_map_channel(int session_objd, |
456 | struct lttng_ust_channel *ust_chan, | |
457 | union ust_args *uargs, | |
458 | void *owner) | |
f4681817 | 459 | { |
7dd08bec | 460 | struct lttng_session *session = objd_private(session_objd); |
f4681817 | 461 | const char *transport_name; |
74d81a6c MD |
462 | const struct lttng_transport *transport; |
463 | const char *chan_name; | |
f4681817 | 464 | int chan_objd; |
74d81a6c MD |
465 | struct lttng_ust_shm_handle *channel_handle; |
466 | struct lttng_channel *lttng_chan; | |
467 | struct channel *chan; | |
468 | struct lttng_ust_lib_ring_buffer_config *config; | |
469 | void *chan_data; | |
ff0f5728 | 470 | int wakeup_fd; |
74d81a6c MD |
471 | uint64_t len; |
472 | int ret; | |
473 | enum lttng_ust_chan_type type; | |
474 | ||
475 | chan_data = uargs->channel.chan_data; | |
ff0f5728 | 476 | wakeup_fd = uargs->channel.wakeup_fd; |
74d81a6c MD |
477 | len = ust_chan->len; |
478 | type = ust_chan->type; | |
479 | ||
480 | switch (type) { | |
481 | case LTTNG_UST_CHAN_PER_CPU: | |
74d81a6c MD |
482 | break; |
483 | default: | |
ff0f5728 MD |
484 | ret = -EINVAL; |
485 | goto invalid; | |
74d81a6c MD |
486 | } |
487 | ||
488 | if (session->been_active) { | |
489 | ret = -EBUSY; | |
490 | goto active; /* Refuse to add channel to active session */ | |
491 | } | |
f4681817 | 492 | |
ff0f5728 | 493 | channel_handle = channel_handle_create(chan_data, len, wakeup_fd); |
74d81a6c MD |
494 | if (!channel_handle) { |
495 | ret = -EINVAL; | |
496 | goto handle_error; | |
497 | } | |
498 | ||
499 | chan = shmp(channel_handle, channel_handle->chan); | |
500 | assert(chan); | |
03d2d293 | 501 | chan->handle = channel_handle; |
74d81a6c MD |
502 | config = &chan->backend.config; |
503 | lttng_chan = channel_get_private(chan); | |
504 | if (!lttng_chan) { | |
505 | ret = -EINVAL; | |
506 | goto alloc_error; | |
507 | } | |
508 | ||
509 | /* Lookup transport name */ | |
510 | switch (type) { | |
511 | case LTTNG_UST_CHAN_PER_CPU: | |
512 | if (config->output == RING_BUFFER_MMAP) { | |
34a91bdb MD |
513 | if (config->mode == RING_BUFFER_OVERWRITE) { |
514 | if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) { | |
515 | transport_name = "relay-overwrite-mmap"; | |
516 | } else { | |
517 | transport_name = "relay-overwrite-rt-mmap"; | |
518 | } | |
519 | } else { | |
520 | if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) { | |
521 | transport_name = "relay-discard-mmap"; | |
522 | } else { | |
523 | transport_name = "relay-discard-rt-mmap"; | |
524 | } | |
525 | } | |
f4681817 | 526 | } else { |
74d81a6c MD |
527 | ret = -EINVAL; |
528 | goto notransport; | |
f4681817 | 529 | } |
74d81a6c | 530 | chan_name = "channel"; |
f4681817 | 531 | break; |
f4681817 | 532 | default: |
74d81a6c MD |
533 | ret = -EINVAL; |
534 | goto notransport; | |
fe38d4af | 535 | } |
74d81a6c MD |
536 | transport = lttng_transport_find(transport_name); |
537 | if (!transport) { | |
538 | DBG("LTTng transport %s not found\n", | |
539 | transport_name); | |
540 | ret = -EINVAL; | |
541 | goto notransport; | |
542 | } | |
543 | ||
544 | chan_objd = objd_alloc(NULL, <tng_channel_ops, owner, chan_name); | |
fe38d4af MD |
545 | if (chan_objd < 0) { |
546 | ret = chan_objd; | |
547 | goto objd_error; | |
f4681817 | 548 | } |
74d81a6c MD |
549 | |
550 | /* Initialize our lttng chan */ | |
551 | lttng_chan->chan = chan; | |
ac6b4ac6 | 552 | lttng_chan->tstate = 1; |
74d81a6c MD |
553 | lttng_chan->enabled = 1; |
554 | lttng_chan->ctx = NULL; | |
555 | lttng_chan->session = session; | |
74d81a6c MD |
556 | lttng_chan->ops = &transport->ops; |
557 | memcpy(<tng_chan->chan->backend.config, | |
558 | transport->client_config, | |
559 | sizeof(lttng_chan->chan->backend.config)); | |
560 | cds_list_add(<tng_chan->node, &session->chan_head); | |
561 | lttng_chan->header_type = 0; | |
562 | lttng_chan->handle = channel_handle; | |
74d81a6c MD |
563 | lttng_chan->type = type; |
564 | ||
f4681817 MD |
565 | /* |
566 | * We tolerate no failure path after channel creation. It will stay | |
567 | * invariant for the rest of the session. | |
568 | */ | |
74d81a6c MD |
569 | objd_set_private(chan_objd, lttng_chan); |
570 | lttng_chan->objd = chan_objd; | |
f4681817 MD |
571 | /* The channel created holds a reference on the session */ |
572 | objd_ref(session_objd); | |
f4681817 MD |
573 | return chan_objd; |
574 | ||
ff0f5728 | 575 | /* error path after channel was created */ |
f4681817 | 576 | objd_error: |
74d81a6c | 577 | notransport: |
74d81a6c MD |
578 | alloc_error: |
579 | channel_destroy(chan, channel_handle, 0); | |
ff0f5728 MD |
580 | return ret; |
581 | ||
582 | /* | |
583 | * error path before channel creation (owning chan_data and | |
584 | * wakeup_fd). | |
585 | */ | |
74d81a6c MD |
586 | handle_error: |
587 | active: | |
ff0f5728 MD |
588 | invalid: |
589 | { | |
590 | int close_ret; | |
591 | ||
6548fca4 | 592 | lttng_ust_lock_fd_tracker(); |
ff0f5728 | 593 | close_ret = close(wakeup_fd); |
6548fca4 | 594 | lttng_ust_unlock_fd_tracker(); |
ff0f5728 MD |
595 | if (close_ret) { |
596 | PERROR("close"); | |
597 | } | |
598 | } | |
599 | free(chan_data); | |
f4681817 MD |
600 | return ret; |
601 | } | |
602 | ||
603 | /** | |
604 | * lttng_session_cmd - lttng session object command | |
605 | * | |
606 | * @obj: the object | |
607 | * @cmd: the command | |
608 | * @arg: command arg | |
ef9ff354 | 609 | * @uargs: UST arguments (internal) |
f59ed768 | 610 | * @owner: objd owner |
f4681817 MD |
611 | * |
612 | * This descriptor implements lttng commands: | |
613 | * LTTNG_UST_CHANNEL | |
614 | * Returns a LTTng channel object descriptor | |
615 | * LTTNG_UST_ENABLE | |
616 | * Enables tracing for a session (weak enable) | |
617 | * LTTNG_UST_DISABLE | |
618 | * Disables tracing for a session (strong disable) | |
f4681817 MD |
619 | * |
620 | * The returned channel will be deleted when its file descriptor is closed. | |
621 | */ | |
622 | static | |
ef9ff354 | 623 | long lttng_session_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 624 | union ust_args *uargs, void *owner) |
f4681817 | 625 | { |
7dd08bec | 626 | struct lttng_session *session = objd_private(objd); |
f4681817 MD |
627 | |
628 | switch (cmd) { | |
629 | case LTTNG_UST_CHANNEL: | |
74d81a6c | 630 | return lttng_abi_map_channel(objd, |
f4681817 | 631 | (struct lttng_ust_channel *) arg, |
74d81a6c | 632 | uargs, owner); |
f4681817 MD |
633 | case LTTNG_UST_SESSION_START: |
634 | case LTTNG_UST_ENABLE: | |
7dd08bec | 635 | return lttng_session_enable(session); |
f4681817 MD |
636 | case LTTNG_UST_SESSION_STOP: |
637 | case LTTNG_UST_DISABLE: | |
7dd08bec | 638 | return lttng_session_disable(session); |
710b8ee3 MD |
639 | case LTTNG_UST_SESSION_STATEDUMP: |
640 | return lttng_session_statedump(session); | |
ebabbf58 MD |
641 | case LTTNG_UST_COUNTER: |
642 | case LTTNG_UST_COUNTER_GLOBAL: | |
643 | case LTTNG_UST_COUNTER_CPU: | |
644 | /* Not implemented yet. */ | |
645 | return -EINVAL; | |
f4681817 MD |
646 | default: |
647 | return -EINVAL; | |
648 | } | |
649 | } | |
650 | ||
651 | /* | |
652 | * Called when the last file reference is dropped. | |
653 | * | |
654 | * Big fat note: channels and events are invariant for the whole session after | |
655 | * their creation. So this session destruction also destroys all channel and | |
656 | * event structures specific to this session (they are not destroyed when their | |
657 | * individual file is released). | |
658 | */ | |
659 | static | |
1ea11eab | 660 | int lttng_release_session(int objd) |
f4681817 | 661 | { |
7dd08bec | 662 | struct lttng_session *session = objd_private(objd); |
f4681817 | 663 | |
1ea11eab | 664 | if (session) { |
7dd08bec | 665 | lttng_session_destroy(session); |
1ea11eab MD |
666 | return 0; |
667 | } else { | |
668 | return -EINVAL; | |
669 | } | |
f4681817 MD |
670 | } |
671 | ||
b61ce3b2 | 672 | static const struct lttng_ust_objd_ops lttng_session_ops = { |
1ea11eab | 673 | .release = lttng_release_session, |
f4681817 MD |
674 | .cmd = lttng_session_cmd, |
675 | }; | |
676 | ||
d8d2416d FD |
677 | static int lttng_ust_event_notifier_enabler_create(int event_notifier_group_obj, |
678 | void *owner, struct lttng_ust_event_notifier *event_notifier_param, | |
679 | enum lttng_enabler_format_type type) | |
680 | { | |
681 | struct lttng_event_notifier_group *event_notifier_group = | |
682 | objd_private(event_notifier_group_obj); | |
683 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
684 | int event_notifier_objd, ret; | |
685 | ||
686 | event_notifier_param->event.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
687 | event_notifier_objd = objd_alloc(NULL, <tng_event_notifier_enabler_ops, owner, | |
688 | "event_notifier enabler"); | |
689 | if (event_notifier_objd < 0) { | |
690 | ret = event_notifier_objd; | |
691 | goto objd_error; | |
692 | } | |
693 | ||
694 | event_notifier_enabler = lttng_event_notifier_enabler_create( | |
695 | event_notifier_group, type, event_notifier_param); | |
696 | if (!event_notifier_enabler) { | |
697 | ret = -ENOMEM; | |
698 | goto event_notifier_error; | |
699 | } | |
700 | ||
701 | objd_set_private(event_notifier_objd, event_notifier_enabler); | |
702 | /* The event_notifier holds a reference on the event_notifier group. */ | |
703 | objd_ref(event_notifier_enabler->group->objd); | |
704 | ||
705 | return event_notifier_objd; | |
706 | ||
707 | event_notifier_error: | |
708 | { | |
709 | int err; | |
710 | ||
711 | err = lttng_ust_objd_unref(event_notifier_objd, 1); | |
712 | assert(!err); | |
713 | } | |
714 | objd_error: | |
715 | return ret; | |
716 | } | |
717 | ||
718 | static | |
719 | long lttng_event_notifier_enabler_cmd(int objd, unsigned int cmd, unsigned long arg, | |
720 | union ust_args *uargs, void *owner) | |
721 | { | |
722 | struct lttng_event_notifier_enabler *event_notifier_enabler = objd_private(objd); | |
723 | switch (cmd) { | |
724 | case LTTNG_UST_FILTER: | |
a56fd376 FD |
725 | return lttng_event_notifier_enabler_attach_filter_bytecode( |
726 | event_notifier_enabler, | |
ab249ecf | 727 | (struct lttng_ust_bytecode_node *) arg); |
d8d2416d FD |
728 | case LTTNG_UST_EXCLUSION: |
729 | return lttng_event_notifier_enabler_attach_exclusion(event_notifier_enabler, | |
730 | (struct lttng_ust_excluder_node *) arg); | |
d37ecb3f FD |
731 | case LTTNG_UST_CAPTURE: |
732 | return lttng_event_notifier_enabler_attach_capture_bytecode( | |
733 | event_notifier_enabler, | |
734 | (struct lttng_ust_bytecode_node *) arg); | |
d8d2416d FD |
735 | case LTTNG_UST_ENABLE: |
736 | return lttng_event_notifier_enabler_enable(event_notifier_enabler); | |
737 | case LTTNG_UST_DISABLE: | |
738 | return lttng_event_notifier_enabler_disable(event_notifier_enabler); | |
739 | default: | |
740 | return -EINVAL; | |
741 | } | |
742 | } | |
743 | ||
ebabbf58 MD |
744 | /** |
745 | * lttng_event_notifier_group_error_counter_cmd - lttng event_notifier group error counter object command | |
746 | * | |
747 | * @obj: the object | |
748 | * @cmd: the command | |
749 | * @arg: command arg | |
750 | * @uargs: UST arguments (internal) | |
751 | * @owner: objd owner | |
752 | * | |
753 | * This descriptor implements lttng commands: | |
754 | * LTTNG_UST_COUNTER_GLOBAL | |
755 | * Return negative error code on error, 0 on success. | |
756 | * LTTNG_UST_COUNTER_CPU | |
757 | * Return negative error code on error, 0 on success. | |
758 | */ | |
759 | static | |
760 | long lttng_event_notifier_group_error_counter_cmd(int objd, unsigned int cmd, unsigned long arg, | |
761 | union ust_args *uargs, void *owner) | |
762 | { | |
763 | struct lttng_counter *counter = objd_private(objd); | |
764 | ||
765 | switch (cmd) { | |
766 | case LTTNG_UST_COUNTER_GLOBAL: | |
767 | return -EINVAL; /* Unimplemented. */ | |
768 | case LTTNG_UST_COUNTER_CPU: | |
769 | { | |
770 | struct lttng_ust_counter_cpu *counter_cpu = | |
771 | (struct lttng_ust_counter_cpu *)arg; | |
772 | return lttng_counter_set_cpu_shm(counter->counter, | |
773 | counter_cpu->cpu_nr, uargs->counter_shm.shm_fd); | |
774 | } | |
775 | default: | |
776 | return -EINVAL; | |
777 | } | |
778 | } | |
779 | ||
780 | int lttng_release_event_notifier_group_error_counter(int objd) | |
781 | { | |
782 | struct lttng_counter *counter = objd_private(objd); | |
783 | ||
784 | if (counter) { | |
785 | return lttng_ust_objd_unref(counter->event_notifier_group->objd, 0); | |
786 | } else { | |
787 | return -EINVAL; | |
788 | } | |
789 | } | |
790 | ||
791 | static const struct lttng_ust_objd_ops lttng_event_notifier_group_error_counter_ops = { | |
792 | .release = lttng_release_event_notifier_group_error_counter, | |
793 | .cmd = lttng_event_notifier_group_error_counter_cmd, | |
794 | }; | |
795 | ||
796 | static | |
797 | int lttng_ust_event_notifier_group_create_error_counter(int event_notifier_group_objd, void *owner, | |
798 | struct lttng_ust_counter_conf *error_counter_conf) | |
799 | { | |
800 | const char *counter_transport_name; | |
801 | struct lttng_event_notifier_group *event_notifier_group = | |
802 | objd_private(event_notifier_group_objd); | |
803 | struct lttng_counter *counter; | |
804 | int counter_objd, ret; | |
805 | struct lttng_counter_dimension dimensions[1]; | |
806 | size_t counter_len; | |
807 | ||
808 | if (event_notifier_group->error_counter) | |
809 | return -EBUSY; | |
810 | ||
811 | if (error_counter_conf->arithmetic != LTTNG_UST_COUNTER_ARITHMETIC_MODULAR) | |
812 | return -EINVAL; | |
813 | ||
814 | if (error_counter_conf->number_dimensions != 1) | |
815 | return -EINVAL; | |
816 | ||
817 | switch (error_counter_conf->bitness) { | |
818 | case LTTNG_UST_COUNTER_BITNESS_64BITS: | |
819 | counter_transport_name = "counter-per-cpu-64-modular"; | |
820 | break; | |
821 | case LTTNG_UST_COUNTER_BITNESS_32BITS: | |
822 | counter_transport_name = "counter-per-cpu-32-modular"; | |
823 | break; | |
824 | default: | |
825 | return -EINVAL; | |
826 | } | |
827 | ||
828 | counter_objd = objd_alloc(NULL, <tng_event_notifier_group_error_counter_ops, owner, | |
829 | "event_notifier group error counter"); | |
830 | if (counter_objd < 0) { | |
831 | ret = counter_objd; | |
832 | goto objd_error; | |
833 | } | |
834 | ||
835 | counter_len = error_counter_conf->dimensions[0].size; | |
836 | dimensions[0].size = counter_len; | |
837 | dimensions[0].underflow_index = 0; | |
838 | dimensions[0].overflow_index = 0; | |
839 | dimensions[0].has_underflow = 0; | |
840 | dimensions[0].has_overflow = 0; | |
841 | ||
842 | counter = lttng_ust_counter_create(counter_transport_name, 1, dimensions); | |
843 | if (!counter) { | |
844 | ret = -EINVAL; | |
845 | goto create_error; | |
846 | } | |
847 | ||
848 | event_notifier_group->error_counter = counter; | |
849 | event_notifier_group->error_counter_len = counter_len; | |
850 | ||
851 | counter->objd = counter_objd; | |
852 | counter->event_notifier_group = event_notifier_group; /* owner */ | |
853 | ||
854 | objd_set_private(counter_objd, counter); | |
855 | /* The error counter holds a reference on the event_notifier group. */ | |
856 | objd_ref(event_notifier_group->objd); | |
857 | ||
858 | return counter_objd; | |
859 | ||
860 | create_error: | |
861 | { | |
862 | int err; | |
863 | ||
864 | err = lttng_ust_objd_unref(counter_objd, 1); | |
865 | assert(!err); | |
866 | } | |
867 | objd_error: | |
868 | return ret; | |
869 | } | |
870 | ||
d8d2416d FD |
871 | static |
872 | long lttng_event_notifier_group_cmd(int objd, unsigned int cmd, unsigned long arg, | |
873 | union ust_args *uargs, void *owner) | |
874 | { | |
875 | switch (cmd) { | |
876 | case LTTNG_UST_EVENT_NOTIFIER_CREATE: | |
877 | { | |
878 | struct lttng_ust_event_notifier *event_notifier_param = | |
879 | (struct lttng_ust_event_notifier *) arg; | |
880 | if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) { | |
881 | /* | |
882 | * If the event name is a star globbing pattern, | |
883 | * we create the special star globbing enabler. | |
884 | */ | |
885 | return lttng_ust_event_notifier_enabler_create(objd, | |
886 | owner, event_notifier_param, | |
887 | LTTNG_ENABLER_FORMAT_STAR_GLOB); | |
888 | } else { | |
889 | return lttng_ust_event_notifier_enabler_create(objd, | |
890 | owner, event_notifier_param, | |
891 | LTTNG_ENABLER_FORMAT_EVENT); | |
892 | } | |
893 | } | |
ebabbf58 MD |
894 | case LTTNG_UST_COUNTER: |
895 | { | |
896 | struct lttng_ust_counter_conf *counter_conf = | |
897 | (struct lttng_ust_counter_conf *) uargs->counter.counter_data; | |
898 | return lttng_ust_event_notifier_group_create_error_counter( | |
899 | objd, owner, counter_conf); | |
900 | } | |
d8d2416d FD |
901 | default: |
902 | return -EINVAL; | |
903 | } | |
904 | } | |
905 | ||
906 | static | |
907 | int lttng_event_notifier_enabler_release(int objd) | |
908 | { | |
909 | struct lttng_event_notifier_enabler *event_notifier_enabler = objd_private(objd); | |
910 | ||
911 | if (event_notifier_enabler) | |
912 | return lttng_ust_objd_unref(event_notifier_enabler->group->objd, 0); | |
913 | return 0; | |
914 | } | |
915 | ||
916 | static const struct lttng_ust_objd_ops lttng_event_notifier_enabler_ops = { | |
917 | .release = lttng_event_notifier_enabler_release, | |
918 | .cmd = lttng_event_notifier_enabler_cmd, | |
919 | }; | |
920 | ||
921 | static | |
922 | int lttng_release_event_notifier_group(int objd) | |
923 | { | |
924 | struct lttng_event_notifier_group *event_notifier_group = objd_private(objd); | |
925 | ||
926 | if (event_notifier_group) { | |
927 | lttng_event_notifier_group_destroy(event_notifier_group); | |
928 | return 0; | |
929 | } else { | |
930 | return -EINVAL; | |
931 | } | |
932 | } | |
933 | ||
934 | static const struct lttng_ust_objd_ops lttng_event_notifier_group_ops = { | |
935 | .release = lttng_release_event_notifier_group, | |
936 | .cmd = lttng_event_notifier_group_cmd, | |
937 | }; | |
938 | ||
51489cad | 939 | static |
ef9ff354 | 940 | long lttng_tracepoint_list_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 941 | union ust_args *uargs, void *owner) |
51489cad | 942 | { |
c8fcf224 | 943 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
cbef6901 MD |
944 | struct lttng_ust_tracepoint_iter *tp = |
945 | (struct lttng_ust_tracepoint_iter *) arg; | |
c8fcf224 | 946 | struct lttng_ust_tracepoint_iter *iter; |
51489cad MD |
947 | |
948 | switch (cmd) { | |
949 | case LTTNG_UST_TRACEPOINT_LIST_GET: | |
c8fcf224 | 950 | { |
c8fcf224 MD |
951 | iter = lttng_ust_tracepoint_list_get_iter_next(list); |
952 | if (!iter) | |
7bc53e94 | 953 | return -LTTNG_UST_ERR_NOENT; |
c8fcf224 | 954 | memcpy(tp, iter, sizeof(*tp)); |
51489cad | 955 | return 0; |
c8fcf224 | 956 | } |
51489cad MD |
957 | default: |
958 | return -EINVAL; | |
959 | } | |
960 | } | |
961 | ||
962 | static | |
f59ed768 | 963 | int lttng_abi_tracepoint_list(void *owner) |
51489cad MD |
964 | { |
965 | int list_objd, ret; | |
c8fcf224 | 966 | struct lttng_ust_tracepoint_list *list; |
51489cad | 967 | |
7047f3da | 968 | list_objd = objd_alloc(NULL, <tng_tracepoint_list_ops, owner, "tp_list"); |
51489cad MD |
969 | if (list_objd < 0) { |
970 | ret = list_objd; | |
971 | goto objd_error; | |
972 | } | |
973 | list = zmalloc(sizeof(*list)); | |
974 | if (!list) { | |
975 | ret = -ENOMEM; | |
976 | goto alloc_error; | |
977 | } | |
978 | objd_set_private(list_objd, list); | |
979 | ||
c8fcf224 | 980 | /* populate list by walking on all registered probes. */ |
7dd08bec | 981 | ret = lttng_probes_get_event_list(list); |
c8fcf224 MD |
982 | if (ret) { |
983 | goto list_error; | |
984 | } | |
51489cad MD |
985 | return list_objd; |
986 | ||
c8fcf224 MD |
987 | list_error: |
988 | free(list); | |
51489cad MD |
989 | alloc_error: |
990 | { | |
991 | int err; | |
992 | ||
1849ef7c | 993 | err = lttng_ust_objd_unref(list_objd, 1); |
51489cad MD |
994 | assert(!err); |
995 | } | |
996 | objd_error: | |
997 | return ret; | |
998 | } | |
999 | ||
1000 | static | |
1001 | int lttng_release_tracepoint_list(int objd) | |
1002 | { | |
c8fcf224 | 1003 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
51489cad MD |
1004 | |
1005 | if (list) { | |
7dd08bec | 1006 | lttng_probes_prune_event_list(list); |
51489cad MD |
1007 | free(list); |
1008 | return 0; | |
1009 | } else { | |
1010 | return -EINVAL; | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops = { | |
1015 | .release = lttng_release_tracepoint_list, | |
1016 | .cmd = lttng_tracepoint_list_cmd, | |
1017 | }; | |
1018 | ||
06d4f27e MD |
1019 | static |
1020 | long lttng_tracepoint_field_list_cmd(int objd, unsigned int cmd, | |
f59ed768 | 1021 | unsigned long arg, union ust_args *uargs, void *owner) |
06d4f27e MD |
1022 | { |
1023 | struct lttng_ust_field_list *list = objd_private(objd); | |
40003310 | 1024 | struct lttng_ust_field_iter *tp = &uargs->field_list.entry; |
06d4f27e MD |
1025 | struct lttng_ust_field_iter *iter; |
1026 | ||
1027 | switch (cmd) { | |
1028 | case LTTNG_UST_TRACEPOINT_FIELD_LIST_GET: | |
1029 | { | |
06d4f27e MD |
1030 | iter = lttng_ust_field_list_get_iter_next(list); |
1031 | if (!iter) | |
7bc53e94 | 1032 | return -LTTNG_UST_ERR_NOENT; |
06d4f27e MD |
1033 | memcpy(tp, iter, sizeof(*tp)); |
1034 | return 0; | |
1035 | } | |
1036 | default: | |
1037 | return -EINVAL; | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | static | |
f59ed768 | 1042 | int lttng_abi_tracepoint_field_list(void *owner) |
06d4f27e MD |
1043 | { |
1044 | int list_objd, ret; | |
1045 | struct lttng_ust_field_list *list; | |
1046 | ||
7047f3da MD |
1047 | list_objd = objd_alloc(NULL, <tng_tracepoint_field_list_ops, owner, |
1048 | "tp_field_list"); | |
06d4f27e MD |
1049 | if (list_objd < 0) { |
1050 | ret = list_objd; | |
1051 | goto objd_error; | |
1052 | } | |
1053 | list = zmalloc(sizeof(*list)); | |
1054 | if (!list) { | |
1055 | ret = -ENOMEM; | |
1056 | goto alloc_error; | |
1057 | } | |
1058 | objd_set_private(list_objd, list); | |
1059 | ||
1060 | /* populate list by walking on all registered probes. */ | |
7dd08bec | 1061 | ret = lttng_probes_get_field_list(list); |
06d4f27e MD |
1062 | if (ret) { |
1063 | goto list_error; | |
1064 | } | |
1065 | return list_objd; | |
1066 | ||
1067 | list_error: | |
1068 | free(list); | |
1069 | alloc_error: | |
1070 | { | |
1071 | int err; | |
1072 | ||
1849ef7c | 1073 | err = lttng_ust_objd_unref(list_objd, 1); |
06d4f27e MD |
1074 | assert(!err); |
1075 | } | |
1076 | objd_error: | |
1077 | return ret; | |
1078 | } | |
1079 | ||
1080 | static | |
1081 | int lttng_release_tracepoint_field_list(int objd) | |
1082 | { | |
1083 | struct lttng_ust_field_list *list = objd_private(objd); | |
1084 | ||
1085 | if (list) { | |
7dd08bec | 1086 | lttng_probes_prune_field_list(list); |
06d4f27e MD |
1087 | free(list); |
1088 | return 0; | |
1089 | } else { | |
1090 | return -EINVAL; | |
1091 | } | |
1092 | } | |
1093 | ||
1094 | static const struct lttng_ust_objd_ops lttng_tracepoint_field_list_ops = { | |
1095 | .release = lttng_release_tracepoint_field_list, | |
1096 | .cmd = lttng_tracepoint_field_list_cmd, | |
1097 | }; | |
1098 | ||
f4681817 | 1099 | static |
74d81a6c | 1100 | int lttng_abi_map_stream(int channel_objd, struct lttng_ust_stream *info, |
f59ed768 | 1101 | union ust_args *uargs, void *owner) |
f4681817 | 1102 | { |
7dd08bec | 1103 | struct lttng_channel *channel = objd_private(channel_objd); |
74d81a6c | 1104 | int ret; |
f4681817 | 1105 | |
74d81a6c MD |
1106 | ret = channel_handle_add_stream(channel->handle, |
1107 | uargs->stream.shm_fd, uargs->stream.wakeup_fd, | |
1108 | info->stream_nr, info->len); | |
1109 | if (ret) | |
1110 | goto error_add_stream; | |
1111 | ||
1112 | return 0; | |
1113 | ||
1114 | error_add_stream: | |
f4681817 MD |
1115 | return ret; |
1116 | } | |
f4681817 MD |
1117 | |
1118 | static | |
d871c65b | 1119 | int lttng_abi_create_event_enabler(int channel_objd, |
f59ed768 | 1120 | struct lttng_ust_event *event_param, |
e58095ef | 1121 | void *owner, |
e450e339 | 1122 | enum lttng_enabler_format_type format_type) |
f4681817 | 1123 | { |
7dd08bec | 1124 | struct lttng_channel *channel = objd_private(channel_objd); |
d871c65b | 1125 | struct lttng_event_enabler *enabler; |
f4681817 MD |
1126 | int event_objd, ret; |
1127 | ||
1128 | event_param->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
d871c65b FD |
1129 | event_objd = objd_alloc(NULL, <tng_event_enabler_ops, owner, |
1130 | "event enabler"); | |
f4681817 MD |
1131 | if (event_objd < 0) { |
1132 | ret = event_objd; | |
1133 | goto objd_error; | |
1134 | } | |
1135 | /* | |
1136 | * We tolerate no failure path after event creation. It will stay | |
1137 | * invariant for the rest of the session. | |
1138 | */ | |
d871c65b | 1139 | enabler = lttng_event_enabler_create(format_type, event_param, channel); |
e58095ef MD |
1140 | if (!enabler) { |
1141 | ret = -ENOMEM; | |
f4681817 MD |
1142 | goto event_error; |
1143 | } | |
e58095ef | 1144 | objd_set_private(event_objd, enabler); |
f4681817 MD |
1145 | /* The event holds a reference on the channel */ |
1146 | objd_ref(channel_objd); | |
1147 | return event_objd; | |
1148 | ||
1149 | event_error: | |
1ea11eab MD |
1150 | { |
1151 | int err; | |
1152 | ||
1849ef7c | 1153 | err = lttng_ust_objd_unref(event_objd, 1); |
1ea11eab MD |
1154 | assert(!err); |
1155 | } | |
f4681817 MD |
1156 | objd_error: |
1157 | return ret; | |
1158 | } | |
1159 | ||
1160 | /** | |
1161 | * lttng_channel_cmd - lttng control through object descriptors | |
1162 | * | |
1163 | * @objd: the object descriptor | |
1164 | * @cmd: the command | |
1165 | * @arg: command arg | |
ef9ff354 | 1166 | * @uargs: UST arguments (internal) |
f59ed768 | 1167 | * @owner: objd owner |
f4681817 MD |
1168 | * |
1169 | * This object descriptor implements lttng commands: | |
1170 | * LTTNG_UST_STREAM | |
1171 | * Returns an event stream object descriptor or failure. | |
1172 | * (typically, one event stream records events from one CPU) | |
1173 | * LTTNG_UST_EVENT | |
1174 | * Returns an event object descriptor or failure. | |
1175 | * LTTNG_UST_CONTEXT | |
1176 | * Prepend a context field to each event in the channel | |
1177 | * LTTNG_UST_ENABLE | |
1178 | * Enable recording for events in this channel (weak enable) | |
1179 | * LTTNG_UST_DISABLE | |
1180 | * Disable recording for events in this channel (strong disable) | |
1181 | * | |
1182 | * Channel and event file descriptors also hold a reference on the session. | |
1183 | */ | |
1184 | static | |
ef9ff354 | 1185 | long lttng_channel_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 1186 | union ust_args *uargs, void *owner) |
f4681817 | 1187 | { |
7dd08bec | 1188 | struct lttng_channel *channel = objd_private(objd); |
f4681817 | 1189 | |
74d81a6c MD |
1190 | if (cmd != LTTNG_UST_STREAM) { |
1191 | /* | |
1192 | * Check if channel received all streams. | |
1193 | */ | |
1194 | if (!lttng_is_channel_ready(channel)) | |
1195 | return -EPERM; | |
1196 | } | |
1197 | ||
f4681817 MD |
1198 | switch (cmd) { |
1199 | case LTTNG_UST_STREAM: | |
381c0f1e MD |
1200 | { |
1201 | struct lttng_ust_stream *stream; | |
1202 | ||
1203 | stream = (struct lttng_ust_stream *) arg; | |
1204 | /* stream used as output */ | |
74d81a6c | 1205 | return lttng_abi_map_stream(objd, stream, uargs, owner); |
381c0f1e | 1206 | } |
f4681817 | 1207 | case LTTNG_UST_EVENT: |
1f18504e MD |
1208 | { |
1209 | struct lttng_ust_event *event_param = | |
1210 | (struct lttng_ust_event *) arg; | |
196ec2df PP |
1211 | |
1212 | if (strutils_is_star_glob_pattern(event_param->name)) { | |
1213 | /* | |
1214 | * If the event name is a star globbing pattern, | |
1215 | * we create the special star globbing enabler. | |
1216 | */ | |
d871c65b | 1217 | return lttng_abi_create_event_enabler(objd, event_param, |
e450e339 | 1218 | owner, LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f18504e | 1219 | } else { |
d871c65b | 1220 | return lttng_abi_create_event_enabler(objd, event_param, |
e450e339 | 1221 | owner, LTTNG_ENABLER_FORMAT_EVENT); |
1f18504e MD |
1222 | } |
1223 | } | |
f4681817 MD |
1224 | case LTTNG_UST_CONTEXT: |
1225 | return lttng_abi_add_context(objd, | |
8e696cfa | 1226 | (struct lttng_ust_context *) arg, uargs, |
f4681817 MD |
1227 | &channel->ctx, channel->session); |
1228 | case LTTNG_UST_ENABLE: | |
7dd08bec | 1229 | return lttng_channel_enable(channel); |
f4681817 | 1230 | case LTTNG_UST_DISABLE: |
7dd08bec | 1231 | return lttng_channel_disable(channel); |
43d330a4 MD |
1232 | case LTTNG_UST_FLUSH_BUFFER: |
1233 | return channel->ops->flush_buffer(channel->chan, channel->handle); | |
f4681817 MD |
1234 | default: |
1235 | return -EINVAL; | |
1236 | } | |
1237 | } | |
1238 | ||
f4681817 MD |
1239 | static |
1240 | int lttng_channel_release(int objd) | |
1241 | { | |
7dd08bec | 1242 | struct lttng_channel *channel = objd_private(objd); |
f4681817 MD |
1243 | |
1244 | if (channel) | |
1849ef7c | 1245 | return lttng_ust_objd_unref(channel->session->objd, 0); |
f4681817 MD |
1246 | return 0; |
1247 | } | |
1248 | ||
b61ce3b2 | 1249 | static const struct lttng_ust_objd_ops lttng_channel_ops = { |
f4681817 | 1250 | .release = lttng_channel_release, |
f4681817 MD |
1251 | .cmd = lttng_channel_cmd, |
1252 | }; | |
1253 | ||
f4681817 | 1254 | /** |
e58095ef | 1255 | * lttng_enabler_cmd - lttng control through object descriptors |
e6c12e3d MD |
1256 | * |
1257 | * @objd: the object descriptor | |
1258 | * @cmd: the command | |
1259 | * @arg: command arg | |
ef9ff354 | 1260 | * @uargs: UST arguments (internal) |
f59ed768 | 1261 | * @owner: objd owner |
e6c12e3d MD |
1262 | * |
1263 | * This object descriptor implements lttng commands: | |
1264 | * LTTNG_UST_CONTEXT | |
1265 | * Prepend a context field to each record of events of this | |
e58095ef | 1266 | * enabler. |
e6c12e3d | 1267 | * LTTNG_UST_ENABLE |
e58095ef | 1268 | * Enable recording for this enabler |
e6c12e3d | 1269 | * LTTNG_UST_DISABLE |
e58095ef | 1270 | * Disable recording for this enabler |
2d78951a | 1271 | * LTTNG_UST_FILTER |
e58095ef | 1272 | * Attach a filter to an enabler. |
0bfb5cbd JI |
1273 | * LTTNG_UST_EXCLUSION |
1274 | * Attach exclusions to an enabler. | |
e6c12e3d MD |
1275 | */ |
1276 | static | |
d871c65b | 1277 | long lttng_event_enabler_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 1278 | union ust_args *uargs, void *owner) |
e6c12e3d | 1279 | { |
d871c65b | 1280 | struct lttng_event_enabler *enabler = objd_private(objd); |
e6c12e3d MD |
1281 | |
1282 | switch (cmd) { | |
1283 | case LTTNG_UST_CONTEXT: | |
d871c65b | 1284 | return lttng_event_enabler_attach_context(enabler, |
e58095ef | 1285 | (struct lttng_ust_context *) arg); |
e6c12e3d | 1286 | case LTTNG_UST_ENABLE: |
d871c65b | 1287 | return lttng_event_enabler_enable(enabler); |
e6c12e3d | 1288 | case LTTNG_UST_DISABLE: |
d871c65b | 1289 | return lttng_event_enabler_disable(enabler); |
2d78951a MD |
1290 | case LTTNG_UST_FILTER: |
1291 | { | |
1292 | int ret; | |
1293 | ||
a56fd376 | 1294 | ret = lttng_event_enabler_attach_filter_bytecode(enabler, |
ab249ecf | 1295 | (struct lttng_ust_bytecode_node *) arg); |
2d78951a MD |
1296 | if (ret) |
1297 | return ret; | |
2d78951a MD |
1298 | return 0; |
1299 | } | |
0bfb5cbd JI |
1300 | case LTTNG_UST_EXCLUSION: |
1301 | { | |
d871c65b | 1302 | return lttng_event_enabler_attach_exclusion(enabler, |
0bfb5cbd JI |
1303 | (struct lttng_ust_excluder_node *) arg); |
1304 | } | |
e6c12e3d MD |
1305 | default: |
1306 | return -EINVAL; | |
1307 | } | |
1308 | } | |
1309 | ||
1310 | static | |
d871c65b | 1311 | int lttng_event_enabler_release(int objd) |
e6c12e3d | 1312 | { |
d871c65b FD |
1313 | struct lttng_event_enabler *event_enabler = objd_private(objd); |
1314 | ||
1315 | if (event_enabler) | |
1316 | return lttng_ust_objd_unref(event_enabler->chan->objd, 0); | |
e6c12e3d | 1317 | |
e6c12e3d MD |
1318 | return 0; |
1319 | } | |
1320 | ||
d871c65b FD |
1321 | static const struct lttng_ust_objd_ops lttng_event_enabler_ops = { |
1322 | .release = lttng_event_enabler_release, | |
1323 | .cmd = lttng_event_enabler_cmd, | |
e6c12e3d MD |
1324 | }; |
1325 | ||
b35d179d | 1326 | void lttng_ust_abi_exit(void) |
f4681817 | 1327 | { |
45e9e699 | 1328 | lttng_ust_abi_close_in_progress = 1; |
701a658f | 1329 | ust_lock_nocheck(); |
f4681817 | 1330 | objd_table_destroy(); |
701a658f | 1331 | ust_unlock(); |
45e9e699 | 1332 | lttng_ust_abi_close_in_progress = 0; |
f4681817 | 1333 | } |