Commit | Line | Data |
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f4681817 | 1 | /* |
c0c0989a | 2 | * SPDX-License-Identifier: LGPL-2.1-only |
f4681817 | 3 | * |
e92f3e28 MD |
4 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
5 | * | |
c0c0989a | 6 | * LTTng UST ABI |
e92f3e28 | 7 | * |
f4681817 MD |
8 | * Mimic system calls for: |
9 | * - session creation, returns an object descriptor or failure. | |
10 | * - channel creation, returns an object descriptor or failure. | |
11 | * - Operates on a session object descriptor | |
12 | * - Takes all channel options as parameters. | |
13 | * - stream get, returns an object descriptor or failure. | |
14 | * - Operates on a channel object descriptor. | |
15 | * - stream notifier get, returns an object descriptor or failure. | |
16 | * - Operates on a channel object descriptor. | |
17 | * - event creation, returns an object descriptor or failure. | |
18 | * - Operates on a channel object descriptor | |
19 | * - Takes an event name as parameter | |
20 | * - Takes an instrumentation source as parameter | |
21 | * - e.g. tracepoints, dynamic_probes... | |
22 | * - Takes instrumentation source specific arguments. | |
f4681817 MD |
23 | */ |
24 | ||
3fbec7dc | 25 | #define _LGPL_SOURCE |
d8d2416d | 26 | #include <fcntl.h> |
fb31eb73 | 27 | #include <stdint.h> |
4e79769f | 28 | #include <unistd.h> |
fb31eb73 | 29 | |
f4681817 MD |
30 | #include <urcu/compiler.h> |
31 | #include <urcu/list.h> | |
fb31eb73 | 32 | |
fb31eb73 FD |
33 | #include <lttng/tracepoint.h> |
34 | #include <lttng/ust-abi.h> | |
35 | #include <lttng/ust-error.h> | |
4318ae1b | 36 | #include <lttng/ust-events.h> |
23c8854a | 37 | #include <lttng/ust-version.h> |
9d315d6d MJ |
38 | |
39 | #include "common/ust-fd.h" | |
40 | #include "common/logging.h" | |
fb31eb73 | 41 | |
e4db8f98 MJ |
42 | #include "common/ringbuffer/frontend_types.h" |
43 | #include "common/ringbuffer/frontend.h" | |
44 | #include "common/ringbuffer/shm.h" | |
cdff92e0 | 45 | #include "common/counter/counter.h" |
10544ee8 | 46 | #include "tracepoint-internal.h" |
7dd08bec | 47 | #include "lttng-tracer.h" |
196ec2df | 48 | #include "string-utils.h" |
36c52fff | 49 | #include "lib/lttng-ust/events.h" |
fc80554e | 50 | #include "context-internal.h" |
9d315d6d | 51 | #include "common/macros.h" |
4ab44fbe | 52 | |
7047f3da MD |
53 | #define OBJ_NAME_LEN 16 |
54 | ||
45e9e699 MD |
55 | static int lttng_ust_abi_close_in_progress; |
56 | ||
51489cad | 57 | static |
f59ed768 | 58 | int lttng_abi_tracepoint_list(void *owner); |
06d4f27e | 59 | static |
f59ed768 | 60 | int lttng_abi_tracepoint_field_list(void *owner); |
51489cad | 61 | |
f4681817 MD |
62 | /* |
63 | * Object descriptor table. Should be protected from concurrent access | |
64 | * by the caller. | |
65 | */ | |
66 | ||
fd17d7ce | 67 | struct lttng_ust_abi_obj { |
f4681817 MD |
68 | union { |
69 | struct { | |
70 | void *private_data; | |
fd17d7ce | 71 | const struct lttng_ust_abi_objd_ops *ops; |
f4681817 | 72 | int f_count; |
1849ef7c | 73 | int owner_ref; /* has ref from owner */ |
f59ed768 | 74 | void *owner; |
7047f3da | 75 | char name[OBJ_NAME_LEN]; |
f4681817 MD |
76 | } s; |
77 | int freelist_next; /* offset freelist. end is -1. */ | |
78 | } u; | |
79 | }; | |
80 | ||
fd17d7ce MD |
81 | struct lttng_ust_abi_objd_table { |
82 | struct lttng_ust_abi_obj *array; | |
f4681817 MD |
83 | unsigned int len, allocated_len; |
84 | int freelist_head; /* offset freelist head. end is -1 */ | |
85 | }; | |
86 | ||
fd17d7ce | 87 | static struct lttng_ust_abi_objd_table objd_table = { |
f4681817 MD |
88 | .freelist_head = -1, |
89 | }; | |
90 | ||
91 | static | |
fd17d7ce | 92 | int objd_alloc(void *private_data, const struct lttng_ust_abi_objd_ops *ops, |
7047f3da | 93 | void *owner, const char *name) |
f4681817 | 94 | { |
fd17d7ce | 95 | struct lttng_ust_abi_obj *obj; |
f4681817 MD |
96 | |
97 | if (objd_table.freelist_head != -1) { | |
98 | obj = &objd_table.array[objd_table.freelist_head]; | |
99 | objd_table.freelist_head = obj->u.freelist_next; | |
100 | goto end; | |
101 | } | |
102 | ||
103 | if (objd_table.len >= objd_table.allocated_len) { | |
104 | unsigned int new_allocated_len, old_allocated_len; | |
fd17d7ce | 105 | struct lttng_ust_abi_obj *new_table, *old_table; |
f4681817 MD |
106 | |
107 | old_allocated_len = objd_table.allocated_len; | |
108 | old_table = objd_table.array; | |
109 | if (!old_allocated_len) | |
110 | new_allocated_len = 1; | |
111 | else | |
112 | new_allocated_len = old_allocated_len << 1; | |
fd17d7ce | 113 | new_table = zmalloc(sizeof(struct lttng_ust_abi_obj) * new_allocated_len); |
f4681817 MD |
114 | if (!new_table) |
115 | return -ENOMEM; | |
116 | memcpy(new_table, old_table, | |
fd17d7ce | 117 | sizeof(struct lttng_ust_abi_obj) * old_allocated_len); |
f4681817 MD |
118 | free(old_table); |
119 | objd_table.array = new_table; | |
120 | objd_table.allocated_len = new_allocated_len; | |
121 | } | |
122 | obj = &objd_table.array[objd_table.len]; | |
123 | objd_table.len++; | |
124 | end: | |
125 | obj->u.s.private_data = private_data; | |
126 | obj->u.s.ops = ops; | |
a4be8962 MD |
127 | obj->u.s.f_count = 2; /* count == 1 : object is allocated */ |
128 | /* count == 2 : allocated + hold ref */ | |
1849ef7c | 129 | obj->u.s.owner_ref = 1; /* One owner reference */ |
f59ed768 | 130 | obj->u.s.owner = owner; |
7047f3da MD |
131 | strncpy(obj->u.s.name, name, OBJ_NAME_LEN); |
132 | obj->u.s.name[OBJ_NAME_LEN - 1] = '\0'; | |
f4681817 MD |
133 | return obj - objd_table.array; |
134 | } | |
135 | ||
136 | static | |
fd17d7ce | 137 | struct lttng_ust_abi_obj *_objd_get(int id) |
f4681817 MD |
138 | { |
139 | if (id >= objd_table.len) | |
140 | return NULL; | |
a4be8962 MD |
141 | if (!objd_table.array[id].u.s.f_count) |
142 | return NULL; | |
f4681817 MD |
143 | return &objd_table.array[id]; |
144 | } | |
145 | ||
146 | static | |
147 | void *objd_private(int id) | |
148 | { | |
fd17d7ce | 149 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
f4681817 MD |
150 | assert(obj); |
151 | return obj->u.s.private_data; | |
152 | } | |
153 | ||
154 | static | |
155 | void objd_set_private(int id, void *private_data) | |
156 | { | |
fd17d7ce | 157 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
f4681817 MD |
158 | assert(obj); |
159 | obj->u.s.private_data = private_data; | |
160 | } | |
161 | ||
fd17d7ce | 162 | const struct lttng_ust_abi_objd_ops *lttng_ust_abi_objd_ops(int id) |
f4681817 | 163 | { |
fd17d7ce | 164 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
46050b1a | 165 | |
a4be8962 MD |
166 | if (!obj) |
167 | return NULL; | |
f4681817 MD |
168 | return obj->u.s.ops; |
169 | } | |
170 | ||
171 | static | |
172 | void objd_free(int id) | |
173 | { | |
fd17d7ce | 174 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
f4681817 MD |
175 | |
176 | assert(obj); | |
177 | obj->u.freelist_next = objd_table.freelist_head; | |
178 | objd_table.freelist_head = obj - objd_table.array; | |
a4be8962 MD |
179 | assert(obj->u.s.f_count == 1); |
180 | obj->u.s.f_count = 0; /* deallocated */ | |
f4681817 MD |
181 | } |
182 | ||
183 | static | |
184 | void objd_ref(int id) | |
185 | { | |
fd17d7ce | 186 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
072886c4 | 187 | assert(obj != NULL); |
f4681817 MD |
188 | obj->u.s.f_count++; |
189 | } | |
190 | ||
fd17d7ce | 191 | int lttng_ust_abi_objd_unref(int id, int is_owner) |
f4681817 | 192 | { |
fd17d7ce | 193 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
f4681817 | 194 | |
1ea11eab MD |
195 | if (!obj) |
196 | return -EINVAL; | |
a4be8962 MD |
197 | if (obj->u.s.f_count == 1) { |
198 | ERR("Reference counting error\n"); | |
199 | return -EINVAL; | |
200 | } | |
1849ef7c MD |
201 | if (is_owner) { |
202 | if (!obj->u.s.owner_ref) { | |
203 | ERR("Error decrementing owner reference"); | |
204 | return -EINVAL; | |
205 | } | |
206 | obj->u.s.owner_ref--; | |
207 | } | |
a4be8962 | 208 | if ((--obj->u.s.f_count) == 1) { |
fd17d7ce | 209 | const struct lttng_ust_abi_objd_ops *ops = lttng_ust_abi_objd_ops(id); |
196ec2df | 210 | |
f4681817 MD |
211 | if (ops->release) |
212 | ops->release(id); | |
213 | objd_free(id); | |
214 | } | |
1ea11eab | 215 | return 0; |
f4681817 MD |
216 | } |
217 | ||
218 | static | |
219 | void objd_table_destroy(void) | |
220 | { | |
a4be8962 MD |
221 | int i; |
222 | ||
1849ef7c | 223 | for (i = 0; i < objd_table.allocated_len; i++) { |
fd17d7ce | 224 | struct lttng_ust_abi_obj *obj; |
1849ef7c MD |
225 | |
226 | obj = _objd_get(i); | |
227 | if (!obj) | |
228 | continue; | |
229 | if (!obj->u.s.owner_ref) | |
230 | continue; /* only unref owner ref. */ | |
fd17d7ce | 231 | (void) lttng_ust_abi_objd_unref(i, 1); |
1849ef7c | 232 | } |
f4681817 | 233 | free(objd_table.array); |
02fb3381 MD |
234 | objd_table.array = NULL; |
235 | objd_table.len = 0; | |
236 | objd_table.allocated_len = 0; | |
17dfb34b | 237 | objd_table.freelist_head = -1; |
f4681817 MD |
238 | } |
239 | ||
74d81a6c MD |
240 | const char *lttng_ust_obj_get_name(int id) |
241 | { | |
fd17d7ce | 242 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
74d81a6c MD |
243 | |
244 | if (!obj) | |
245 | return NULL; | |
246 | return obj->u.s.name; | |
247 | } | |
248 | ||
fd17d7ce | 249 | void lttng_ust_abi_objd_table_owner_cleanup(void *owner) |
f59ed768 MD |
250 | { |
251 | int i; | |
252 | ||
253 | for (i = 0; i < objd_table.allocated_len; i++) { | |
fd17d7ce | 254 | struct lttng_ust_abi_obj *obj; |
f59ed768 MD |
255 | |
256 | obj = _objd_get(i); | |
257 | if (!obj) | |
258 | continue; | |
259 | if (!obj->u.s.owner) | |
260 | continue; /* skip root handles */ | |
1849ef7c MD |
261 | if (!obj->u.s.owner_ref) |
262 | continue; /* only unref owner ref. */ | |
f59ed768 | 263 | if (obj->u.s.owner == owner) |
fd17d7ce | 264 | (void) lttng_ust_abi_objd_unref(i, 1); |
f59ed768 MD |
265 | } |
266 | } | |
267 | ||
f4681817 MD |
268 | /* |
269 | * This is LTTng's own personal way to create an ABI for sessiond. | |
270 | * We send commands over a socket. | |
271 | */ | |
272 | ||
fd17d7ce MD |
273 | static const struct lttng_ust_abi_objd_ops lttng_ops; |
274 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_ops; | |
275 | static const struct lttng_ust_abi_objd_ops lttng_session_ops; | |
276 | static const struct lttng_ust_abi_objd_ops lttng_channel_ops; | |
277 | static const struct lttng_ust_abi_objd_ops lttng_event_enabler_ops; | |
278 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_enabler_ops; | |
279 | static const struct lttng_ust_abi_objd_ops lttng_tracepoint_list_ops; | |
280 | static const struct lttng_ust_abi_objd_ops lttng_tracepoint_field_list_ops; | |
f4681817 | 281 | |
46050b1a MD |
282 | int lttng_abi_create_root_handle(void) |
283 | { | |
284 | int root_handle; | |
285 | ||
f59ed768 | 286 | /* root handles have NULL owners */ |
7047f3da | 287 | root_handle = objd_alloc(NULL, <tng_ops, NULL, "root"); |
46050b1a MD |
288 | return root_handle; |
289 | } | |
290 | ||
74d81a6c | 291 | static |
e7bc0ef6 | 292 | int lttng_is_channel_ready(struct lttng_ust_channel_buffer *lttng_chan) |
74d81a6c | 293 | { |
5198080d | 294 | struct lttng_ust_lib_ring_buffer_channel *chan; |
74d81a6c MD |
295 | unsigned int nr_streams, exp_streams; |
296 | ||
07539b34 MD |
297 | chan = lttng_chan->priv->rb_chan; |
298 | nr_streams = channel_handle_get_nr_streams(lttng_chan->priv->rb_chan->handle); | |
74d81a6c MD |
299 | exp_streams = chan->nr_streams; |
300 | return nr_streams == exp_streams; | |
301 | } | |
302 | ||
818173b9 | 303 | static |
f59ed768 | 304 | int lttng_abi_create_session(void *owner) |
f4681817 | 305 | { |
f69fe5fb | 306 | struct lttng_ust_session *session; |
f4681817 MD |
307 | int session_objd, ret; |
308 | ||
7dd08bec | 309 | session = lttng_session_create(); |
f4681817 MD |
310 | if (!session) |
311 | return -ENOMEM; | |
7047f3da | 312 | session_objd = objd_alloc(session, <tng_session_ops, owner, "session"); |
f4681817 MD |
313 | if (session_objd < 0) { |
314 | ret = session_objd; | |
315 | goto objd_error; | |
316 | } | |
bdb12629 MD |
317 | session->priv->objd = session_objd; |
318 | session->priv->owner = owner; | |
f4681817 MD |
319 | return session_objd; |
320 | ||
321 | objd_error: | |
7dd08bec | 322 | lttng_session_destroy(session); |
f4681817 MD |
323 | return ret; |
324 | } | |
325 | ||
f4681817 | 326 | static |
2208d8b5 | 327 | long lttng_abi_tracer_version(int objd __attribute__((unused)), |
fd17d7ce | 328 | struct lttng_ust_abi_tracer_version *v) |
f4681817 | 329 | { |
32ce8569 MD |
330 | v->major = LTTNG_UST_MAJOR_VERSION; |
331 | v->minor = LTTNG_UST_MINOR_VERSION; | |
332 | v->patchlevel = LTTNG_UST_PATCHLEVEL_VERSION; | |
f4681817 MD |
333 | return 0; |
334 | } | |
335 | ||
d8d2416d | 336 | static |
f52e5902 | 337 | int lttng_abi_event_notifier_send_fd(void *owner, int *event_notifier_notif_fd) |
d8d2416d FD |
338 | { |
339 | struct lttng_event_notifier_group *event_notifier_group; | |
f52e5902 | 340 | int event_notifier_group_objd, ret, fd_flag; |
d8d2416d FD |
341 | |
342 | event_notifier_group = lttng_event_notifier_group_create(); | |
343 | if (!event_notifier_group) | |
344 | return -ENOMEM; | |
345 | ||
346 | /* | |
347 | * Set this file descriptor as NON-BLOCKING. | |
348 | */ | |
f52e5902 | 349 | fd_flag = fcntl(*event_notifier_notif_fd, F_GETFL); |
d8d2416d FD |
350 | |
351 | fd_flag |= O_NONBLOCK; | |
352 | ||
f52e5902 | 353 | ret = fcntl(*event_notifier_notif_fd, F_SETFL, fd_flag); |
d8d2416d FD |
354 | if (ret) { |
355 | ret = -errno; | |
356 | goto fd_error; | |
357 | } | |
358 | ||
359 | event_notifier_group_objd = objd_alloc(event_notifier_group, | |
360 | <tng_event_notifier_group_ops, owner, "event_notifier_group"); | |
361 | if (event_notifier_group_objd < 0) { | |
362 | ret = event_notifier_group_objd; | |
363 | goto objd_error; | |
364 | } | |
365 | ||
366 | event_notifier_group->objd = event_notifier_group_objd; | |
367 | event_notifier_group->owner = owner; | |
f52e5902 MD |
368 | event_notifier_group->notification_fd = *event_notifier_notif_fd; |
369 | /* Object descriptor takes ownership of notification fd. */ | |
370 | *event_notifier_notif_fd = -1; | |
d8d2416d FD |
371 | |
372 | return event_notifier_group_objd; | |
373 | ||
374 | objd_error: | |
375 | lttng_event_notifier_group_destroy(event_notifier_group); | |
376 | fd_error: | |
d8d2416d FD |
377 | return ret; |
378 | } | |
379 | ||
f4681817 | 380 | static |
2208d8b5 | 381 | long lttng_abi_add_context(int objd __attribute__((unused)), |
fd17d7ce MD |
382 | struct lttng_ust_abi_context *context_param, |
383 | union lttng_ust_abi_args *uargs, | |
f69fe5fb | 384 | struct lttng_ust_ctx **ctx, struct lttng_ust_session *session) |
f4681817 | 385 | { |
8e696cfa | 386 | return lttng_attach_context(context_param, uargs, ctx, session); |
f4681817 MD |
387 | } |
388 | ||
389 | /** | |
390 | * lttng_cmd - lttng control through socket commands | |
391 | * | |
392 | * @objd: the object descriptor | |
393 | * @cmd: the command | |
394 | * @arg: command arg | |
ef9ff354 | 395 | * @uargs: UST arguments (internal) |
f59ed768 | 396 | * @owner: objd owner |
f4681817 MD |
397 | * |
398 | * This descriptor implements lttng commands: | |
fd17d7ce | 399 | * LTTNG_UST_ABI_SESSION |
f4681817 | 400 | * Returns a LTTng trace session object descriptor |
fd17d7ce | 401 | * LTTNG_UST_ABI_TRACER_VERSION |
f4681817 | 402 | * Returns the LTTng kernel tracer version |
fd17d7ce | 403 | * LTTNG_UST_ABI_TRACEPOINT_LIST |
f4681817 | 404 | * Returns a file descriptor listing available tracepoints |
fd17d7ce | 405 | * LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST |
06d4f27e | 406 | * Returns a file descriptor listing available tracepoint fields |
fd17d7ce | 407 | * LTTNG_UST_ABI_WAIT_QUIESCENT |
f4681817 MD |
408 | * Returns after all previously running probes have completed |
409 | * | |
410 | * The returned session will be deleted when its file descriptor is closed. | |
411 | */ | |
412 | static | |
ef9ff354 | 413 | long lttng_cmd(int objd, unsigned int cmd, unsigned long arg, |
fd17d7ce | 414 | union lttng_ust_abi_args *uargs, void *owner) |
f4681817 MD |
415 | { |
416 | switch (cmd) { | |
fd17d7ce | 417 | case LTTNG_UST_ABI_SESSION: |
f59ed768 | 418 | return lttng_abi_create_session(owner); |
fd17d7ce | 419 | case LTTNG_UST_ABI_TRACER_VERSION: |
f4681817 | 420 | return lttng_abi_tracer_version(objd, |
fd17d7ce MD |
421 | (struct lttng_ust_abi_tracer_version *) arg); |
422 | case LTTNG_UST_ABI_TRACEPOINT_LIST: | |
f59ed768 | 423 | return lttng_abi_tracepoint_list(owner); |
fd17d7ce | 424 | case LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST: |
f59ed768 | 425 | return lttng_abi_tracepoint_field_list(owner); |
fd17d7ce | 426 | case LTTNG_UST_ABI_WAIT_QUIESCENT: |
b653ddc1 | 427 | lttng_ust_urcu_synchronize_rcu(); |
f4681817 | 428 | return 0; |
fd17d7ce | 429 | case LTTNG_UST_ABI_EVENT_NOTIFIER_GROUP_CREATE: |
d8d2416d | 430 | return lttng_abi_event_notifier_send_fd(owner, |
f52e5902 | 431 | &uargs->event_notifier_handle.event_notifier_notif_fd); |
f4681817 MD |
432 | default: |
433 | return -EINVAL; | |
434 | } | |
435 | } | |
436 | ||
fd17d7ce | 437 | static const struct lttng_ust_abi_objd_ops lttng_ops = { |
f4681817 MD |
438 | .cmd = lttng_cmd, |
439 | }; | |
440 | ||
04a351cb | 441 | static |
74d81a6c | 442 | int lttng_abi_map_channel(int session_objd, |
fd17d7ce MD |
443 | struct lttng_ust_abi_channel *ust_chan, |
444 | union lttng_ust_abi_args *uargs, | |
74d81a6c | 445 | void *owner) |
f4681817 | 446 | { |
f69fe5fb | 447 | struct lttng_ust_session *session = objd_private(session_objd); |
f4681817 | 448 | const char *transport_name; |
a084756d | 449 | struct lttng_transport *transport; |
74d81a6c | 450 | const char *chan_name; |
f4681817 | 451 | int chan_objd; |
74d81a6c | 452 | struct lttng_ust_shm_handle *channel_handle; |
f0fde1c3 | 453 | struct lttng_ust_abi_channel_config *lttng_chan_config; |
e7bc0ef6 | 454 | struct lttng_ust_channel_buffer *lttng_chan_buf; |
5198080d | 455 | struct lttng_ust_lib_ring_buffer_channel *chan; |
74d81a6c MD |
456 | struct lttng_ust_lib_ring_buffer_config *config; |
457 | void *chan_data; | |
ff0f5728 | 458 | int wakeup_fd; |
74d81a6c MD |
459 | uint64_t len; |
460 | int ret; | |
fd17d7ce | 461 | enum lttng_ust_abi_chan_type type; |
74d81a6c MD |
462 | |
463 | chan_data = uargs->channel.chan_data; | |
ff0f5728 | 464 | wakeup_fd = uargs->channel.wakeup_fd; |
74d81a6c MD |
465 | len = ust_chan->len; |
466 | type = ust_chan->type; | |
467 | ||
468 | switch (type) { | |
fd17d7ce | 469 | case LTTNG_UST_ABI_CHAN_PER_CPU: |
74d81a6c MD |
470 | break; |
471 | default: | |
ff0f5728 MD |
472 | ret = -EINVAL; |
473 | goto invalid; | |
74d81a6c MD |
474 | } |
475 | ||
bdb12629 | 476 | if (session->priv->been_active) { |
74d81a6c MD |
477 | ret = -EBUSY; |
478 | goto active; /* Refuse to add channel to active session */ | |
479 | } | |
f4681817 | 480 | |
e7bc0ef6 MD |
481 | lttng_chan_buf = lttng_ust_alloc_channel_buffer(); |
482 | if (!lttng_chan_buf) { | |
f0fde1c3 | 483 | ret = -ENOMEM; |
e7bc0ef6 | 484 | goto lttng_chan_buf_error; |
f0fde1c3 MD |
485 | } |
486 | ||
ff0f5728 | 487 | channel_handle = channel_handle_create(chan_data, len, wakeup_fd); |
74d81a6c MD |
488 | if (!channel_handle) { |
489 | ret = -EINVAL; | |
490 | goto handle_error; | |
491 | } | |
492 | ||
867942fd MD |
493 | /* Ownership of chan_data and wakeup_fd taken by channel handle. */ |
494 | uargs->channel.chan_data = NULL; | |
495 | uargs->channel.wakeup_fd = -1; | |
496 | ||
74d81a6c MD |
497 | chan = shmp(channel_handle, channel_handle->chan); |
498 | assert(chan); | |
03d2d293 | 499 | chan->handle = channel_handle; |
74d81a6c | 500 | config = &chan->backend.config; |
f0fde1c3 MD |
501 | lttng_chan_config = channel_get_private_config(chan); |
502 | if (!lttng_chan_config) { | |
74d81a6c MD |
503 | ret = -EINVAL; |
504 | goto alloc_error; | |
505 | } | |
506 | ||
9daacd1a MD |
507 | if (lttng_ust_session_uuid_validate(session, lttng_chan_config->uuid)) { |
508 | ret = -EINVAL; | |
509 | goto uuid_error; | |
510 | } | |
511 | ||
74d81a6c MD |
512 | /* Lookup transport name */ |
513 | switch (type) { | |
fd17d7ce | 514 | case LTTNG_UST_ABI_CHAN_PER_CPU: |
74d81a6c | 515 | if (config->output == RING_BUFFER_MMAP) { |
34a91bdb MD |
516 | if (config->mode == RING_BUFFER_OVERWRITE) { |
517 | if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) { | |
518 | transport_name = "relay-overwrite-mmap"; | |
519 | } else { | |
520 | transport_name = "relay-overwrite-rt-mmap"; | |
521 | } | |
522 | } else { | |
523 | if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) { | |
524 | transport_name = "relay-discard-mmap"; | |
525 | } else { | |
526 | transport_name = "relay-discard-rt-mmap"; | |
527 | } | |
528 | } | |
f4681817 | 529 | } else { |
74d81a6c MD |
530 | ret = -EINVAL; |
531 | goto notransport; | |
f4681817 | 532 | } |
74d81a6c | 533 | chan_name = "channel"; |
f4681817 | 534 | break; |
f4681817 | 535 | default: |
74d81a6c MD |
536 | ret = -EINVAL; |
537 | goto notransport; | |
fe38d4af | 538 | } |
65c48d6a | 539 | transport = lttng_ust_transport_find(transport_name); |
74d81a6c MD |
540 | if (!transport) { |
541 | DBG("LTTng transport %s not found\n", | |
542 | transport_name); | |
543 | ret = -EINVAL; | |
544 | goto notransport; | |
545 | } | |
546 | ||
547 | chan_objd = objd_alloc(NULL, <tng_channel_ops, owner, chan_name); | |
fe38d4af MD |
548 | if (chan_objd < 0) { |
549 | ret = chan_objd; | |
550 | goto objd_error; | |
f4681817 | 551 | } |
74d81a6c MD |
552 | |
553 | /* Initialize our lttng chan */ | |
e7bc0ef6 MD |
554 | lttng_chan_buf->parent->enabled = 1; |
555 | lttng_chan_buf->parent->session = session; | |
556 | ||
557 | lttng_chan_buf->priv->parent.tstate = 1; | |
0950190a | 558 | lttng_chan_buf->priv->ctx = NULL; |
07539b34 | 559 | lttng_chan_buf->priv->rb_chan = chan; |
e7bc0ef6 | 560 | |
e7bc0ef6 | 561 | lttng_chan_buf->ops = &transport->ops; |
e7bc0ef6 MD |
562 | |
563 | memcpy(&chan->backend.config, | |
74d81a6c | 564 | transport->client_config, |
e7bc0ef6 MD |
565 | sizeof(chan->backend.config)); |
566 | cds_list_add(<tng_chan_buf->priv->node, &session->priv->chan_head); | |
567 | lttng_chan_buf->priv->header_type = 0; | |
568 | lttng_chan_buf->priv->type = type; | |
f0fde1c3 | 569 | /* Copy fields from lttng ust chan config. */ |
e7bc0ef6 MD |
570 | lttng_chan_buf->priv->id = lttng_chan_config->id; |
571 | memcpy(lttng_chan_buf->priv->uuid, lttng_chan_config->uuid, LTTNG_UST_UUID_LEN); | |
572 | channel_set_private(chan, lttng_chan_buf); | |
74d81a6c | 573 | |
f4681817 MD |
574 | /* |
575 | * We tolerate no failure path after channel creation. It will stay | |
576 | * invariant for the rest of the session. | |
577 | */ | |
e7bc0ef6 MD |
578 | objd_set_private(chan_objd, lttng_chan_buf); |
579 | lttng_chan_buf->priv->parent.objd = chan_objd; | |
f4681817 MD |
580 | /* The channel created holds a reference on the session */ |
581 | objd_ref(session_objd); | |
f4681817 MD |
582 | return chan_objd; |
583 | ||
ff0f5728 | 584 | /* error path after channel was created */ |
f4681817 | 585 | objd_error: |
74d81a6c | 586 | notransport: |
9daacd1a | 587 | uuid_error: |
74d81a6c MD |
588 | alloc_error: |
589 | channel_destroy(chan, channel_handle, 0); | |
e7bc0ef6 | 590 | lttng_ust_free_channel_common(lttng_chan_buf->parent); |
ff0f5728 MD |
591 | return ret; |
592 | ||
74d81a6c | 593 | handle_error: |
e7bc0ef6 MD |
594 | lttng_ust_free_channel_common(lttng_chan_buf->parent); |
595 | lttng_chan_buf_error: | |
74d81a6c | 596 | active: |
ff0f5728 | 597 | invalid: |
f4681817 MD |
598 | return ret; |
599 | } | |
600 | ||
601 | /** | |
602 | * lttng_session_cmd - lttng session object command | |
603 | * | |
604 | * @obj: the object | |
605 | * @cmd: the command | |
606 | * @arg: command arg | |
ef9ff354 | 607 | * @uargs: UST arguments (internal) |
f59ed768 | 608 | * @owner: objd owner |
f4681817 MD |
609 | * |
610 | * This descriptor implements lttng commands: | |
fd17d7ce | 611 | * LTTNG_UST_ABI_CHANNEL |
f4681817 | 612 | * Returns a LTTng channel object descriptor |
fd17d7ce | 613 | * LTTNG_UST_ABI_ENABLE |
f4681817 | 614 | * Enables tracing for a session (weak enable) |
fd17d7ce | 615 | * LTTNG_UST_ABI_DISABLE |
f4681817 | 616 | * Disables tracing for a session (strong disable) |
f4681817 MD |
617 | * |
618 | * The returned channel will be deleted when its file descriptor is closed. | |
619 | */ | |
620 | static | |
ef9ff354 | 621 | long lttng_session_cmd(int objd, unsigned int cmd, unsigned long arg, |
fd17d7ce | 622 | union lttng_ust_abi_args *uargs, void *owner) |
f4681817 | 623 | { |
f69fe5fb | 624 | struct lttng_ust_session *session = objd_private(objd); |
f4681817 MD |
625 | |
626 | switch (cmd) { | |
fd17d7ce | 627 | case LTTNG_UST_ABI_CHANNEL: |
74d81a6c | 628 | return lttng_abi_map_channel(objd, |
fd17d7ce | 629 | (struct lttng_ust_abi_channel *) arg, |
74d81a6c | 630 | uargs, owner); |
fd17d7ce MD |
631 | case LTTNG_UST_ABI_SESSION_START: |
632 | case LTTNG_UST_ABI_ENABLE: | |
7dd08bec | 633 | return lttng_session_enable(session); |
fd17d7ce MD |
634 | case LTTNG_UST_ABI_SESSION_STOP: |
635 | case LTTNG_UST_ABI_DISABLE: | |
7dd08bec | 636 | return lttng_session_disable(session); |
fd17d7ce | 637 | case LTTNG_UST_ABI_SESSION_STATEDUMP: |
710b8ee3 | 638 | return lttng_session_statedump(session); |
fd17d7ce MD |
639 | case LTTNG_UST_ABI_COUNTER: |
640 | case LTTNG_UST_ABI_COUNTER_GLOBAL: | |
641 | case LTTNG_UST_ABI_COUNTER_CPU: | |
ebabbf58 MD |
642 | /* Not implemented yet. */ |
643 | return -EINVAL; | |
f4681817 MD |
644 | default: |
645 | return -EINVAL; | |
646 | } | |
647 | } | |
648 | ||
649 | /* | |
650 | * Called when the last file reference is dropped. | |
651 | * | |
652 | * Big fat note: channels and events are invariant for the whole session after | |
653 | * their creation. So this session destruction also destroys all channel and | |
654 | * event structures specific to this session (they are not destroyed when their | |
655 | * individual file is released). | |
656 | */ | |
657 | static | |
1ea11eab | 658 | int lttng_release_session(int objd) |
f4681817 | 659 | { |
f69fe5fb | 660 | struct lttng_ust_session *session = objd_private(objd); |
f4681817 | 661 | |
1ea11eab | 662 | if (session) { |
7dd08bec | 663 | lttng_session_destroy(session); |
1ea11eab MD |
664 | return 0; |
665 | } else { | |
666 | return -EINVAL; | |
667 | } | |
f4681817 MD |
668 | } |
669 | ||
fd17d7ce | 670 | static const struct lttng_ust_abi_objd_ops lttng_session_ops = { |
1ea11eab | 671 | .release = lttng_release_session, |
f4681817 MD |
672 | .cmd = lttng_session_cmd, |
673 | }; | |
674 | ||
d8d2416d | 675 | static int lttng_ust_event_notifier_enabler_create(int event_notifier_group_obj, |
fd17d7ce | 676 | void *owner, struct lttng_ust_abi_event_notifier *event_notifier_param, |
d8d2416d FD |
677 | enum lttng_enabler_format_type type) |
678 | { | |
679 | struct lttng_event_notifier_group *event_notifier_group = | |
680 | objd_private(event_notifier_group_obj); | |
681 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
682 | int event_notifier_objd, ret; | |
683 | ||
fd17d7ce | 684 | event_notifier_param->event.name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; |
d8d2416d FD |
685 | event_notifier_objd = objd_alloc(NULL, <tng_event_notifier_enabler_ops, owner, |
686 | "event_notifier enabler"); | |
687 | if (event_notifier_objd < 0) { | |
688 | ret = event_notifier_objd; | |
689 | goto objd_error; | |
690 | } | |
691 | ||
692 | event_notifier_enabler = lttng_event_notifier_enabler_create( | |
693 | event_notifier_group, type, event_notifier_param); | |
694 | if (!event_notifier_enabler) { | |
695 | ret = -ENOMEM; | |
696 | goto event_notifier_error; | |
697 | } | |
698 | ||
699 | objd_set_private(event_notifier_objd, event_notifier_enabler); | |
700 | /* The event_notifier holds a reference on the event_notifier group. */ | |
701 | objd_ref(event_notifier_enabler->group->objd); | |
702 | ||
703 | return event_notifier_objd; | |
704 | ||
705 | event_notifier_error: | |
706 | { | |
707 | int err; | |
708 | ||
fd17d7ce | 709 | err = lttng_ust_abi_objd_unref(event_notifier_objd, 1); |
d8d2416d FD |
710 | assert(!err); |
711 | } | |
712 | objd_error: | |
713 | return ret; | |
714 | } | |
715 | ||
716 | static | |
717 | long lttng_event_notifier_enabler_cmd(int objd, unsigned int cmd, unsigned long arg, | |
2208d8b5 MJ |
718 | union lttng_ust_abi_args *uargs __attribute__((unused)), |
719 | void *owner __attribute__((unused))) | |
d8d2416d FD |
720 | { |
721 | struct lttng_event_notifier_enabler *event_notifier_enabler = objd_private(objd); | |
722 | switch (cmd) { | |
fd17d7ce | 723 | case LTTNG_UST_ABI_FILTER: |
a56fd376 FD |
724 | return lttng_event_notifier_enabler_attach_filter_bytecode( |
725 | event_notifier_enabler, | |
ab89263e | 726 | (struct lttng_ust_bytecode_node **) arg); |
fd17d7ce | 727 | case LTTNG_UST_ABI_EXCLUSION: |
d8d2416d | 728 | return lttng_event_notifier_enabler_attach_exclusion(event_notifier_enabler, |
e9fe6aad | 729 | (struct lttng_ust_excluder_node **) arg); |
fd17d7ce | 730 | case LTTNG_UST_ABI_CAPTURE: |
d37ecb3f FD |
731 | return lttng_event_notifier_enabler_attach_capture_bytecode( |
732 | event_notifier_enabler, | |
49cde654 | 733 | (struct lttng_ust_bytecode_node **) arg); |
fd17d7ce | 734 | case LTTNG_UST_ABI_ENABLE: |
d8d2416d | 735 | return lttng_event_notifier_enabler_enable(event_notifier_enabler); |
fd17d7ce | 736 | case LTTNG_UST_ABI_DISABLE: |
d8d2416d FD |
737 | return lttng_event_notifier_enabler_disable(event_notifier_enabler); |
738 | default: | |
739 | return -EINVAL; | |
740 | } | |
741 | } | |
742 | ||
ebabbf58 MD |
743 | /** |
744 | * lttng_event_notifier_group_error_counter_cmd - lttng event_notifier group error counter object command | |
745 | * | |
746 | * @obj: the object | |
747 | * @cmd: the command | |
748 | * @arg: command arg | |
749 | * @uargs: UST arguments (internal) | |
750 | * @owner: objd owner | |
751 | * | |
752 | * This descriptor implements lttng commands: | |
fd17d7ce | 753 | * LTTNG_UST_ABI_COUNTER_GLOBAL |
ebabbf58 | 754 | * Return negative error code on error, 0 on success. |
fd17d7ce | 755 | * LTTNG_UST_ABI_COUNTER_CPU |
ebabbf58 MD |
756 | * Return negative error code on error, 0 on success. |
757 | */ | |
758 | static | |
759 | long lttng_event_notifier_group_error_counter_cmd(int objd, unsigned int cmd, unsigned long arg, | |
2208d8b5 | 760 | union lttng_ust_abi_args *uargs, void *owner __attribute__((unused))) |
ebabbf58 | 761 | { |
ba5b3d2b | 762 | int ret; |
ebabbf58 MD |
763 | struct lttng_counter *counter = objd_private(objd); |
764 | ||
765 | switch (cmd) { | |
fd17d7ce | 766 | case LTTNG_UST_ABI_COUNTER_GLOBAL: |
ba5b3d2b JR |
767 | ret = -EINVAL; /* Unimplemented. */ |
768 | break; | |
fd17d7ce | 769 | case LTTNG_UST_ABI_COUNTER_CPU: |
ebabbf58 | 770 | { |
fd17d7ce MD |
771 | struct lttng_ust_abi_counter_cpu *counter_cpu = |
772 | (struct lttng_ust_abi_counter_cpu *)arg; | |
ba5b3d2b JR |
773 | |
774 | ret = lttng_counter_set_cpu_shm(counter->counter, | |
ebabbf58 | 775 | counter_cpu->cpu_nr, uargs->counter_shm.shm_fd); |
ba5b3d2b JR |
776 | if (!ret) { |
777 | /* Take ownership of the shm_fd. */ | |
778 | uargs->counter_shm.shm_fd = -1; | |
779 | } | |
780 | break; | |
ebabbf58 MD |
781 | } |
782 | default: | |
ba5b3d2b JR |
783 | ret = -EINVAL; |
784 | break; | |
ebabbf58 | 785 | } |
ba5b3d2b JR |
786 | |
787 | return ret; | |
ebabbf58 MD |
788 | } |
789 | ||
1d18d519 MJ |
790 | int lttng_release_event_notifier_group_error_counter(int objd) |
791 | __attribute__((visibility("hidden"))); | |
ebabbf58 MD |
792 | int lttng_release_event_notifier_group_error_counter(int objd) |
793 | { | |
794 | struct lttng_counter *counter = objd_private(objd); | |
795 | ||
796 | if (counter) { | |
fd17d7ce | 797 | return lttng_ust_abi_objd_unref(counter->event_notifier_group->objd, 0); |
ebabbf58 MD |
798 | } else { |
799 | return -EINVAL; | |
800 | } | |
801 | } | |
802 | ||
fd17d7ce | 803 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_error_counter_ops = { |
ebabbf58 MD |
804 | .release = lttng_release_event_notifier_group_error_counter, |
805 | .cmd = lttng_event_notifier_group_error_counter_cmd, | |
806 | }; | |
807 | ||
808 | static | |
809 | int lttng_ust_event_notifier_group_create_error_counter(int event_notifier_group_objd, void *owner, | |
fd17d7ce | 810 | struct lttng_ust_abi_counter_conf *error_counter_conf) |
ebabbf58 MD |
811 | { |
812 | const char *counter_transport_name; | |
813 | struct lttng_event_notifier_group *event_notifier_group = | |
814 | objd_private(event_notifier_group_objd); | |
815 | struct lttng_counter *counter; | |
816 | int counter_objd, ret; | |
817 | struct lttng_counter_dimension dimensions[1]; | |
818 | size_t counter_len; | |
819 | ||
820 | if (event_notifier_group->error_counter) | |
821 | return -EBUSY; | |
822 | ||
fd17d7ce | 823 | if (error_counter_conf->arithmetic != LTTNG_UST_ABI_COUNTER_ARITHMETIC_MODULAR) |
ebabbf58 MD |
824 | return -EINVAL; |
825 | ||
826 | if (error_counter_conf->number_dimensions != 1) | |
827 | return -EINVAL; | |
828 | ||
829 | switch (error_counter_conf->bitness) { | |
fd17d7ce | 830 | case LTTNG_UST_ABI_COUNTER_BITNESS_64: |
ebabbf58 MD |
831 | counter_transport_name = "counter-per-cpu-64-modular"; |
832 | break; | |
fd17d7ce | 833 | case LTTNG_UST_ABI_COUNTER_BITNESS_32: |
ebabbf58 MD |
834 | counter_transport_name = "counter-per-cpu-32-modular"; |
835 | break; | |
836 | default: | |
837 | return -EINVAL; | |
838 | } | |
839 | ||
840 | counter_objd = objd_alloc(NULL, <tng_event_notifier_group_error_counter_ops, owner, | |
841 | "event_notifier group error counter"); | |
842 | if (counter_objd < 0) { | |
843 | ret = counter_objd; | |
844 | goto objd_error; | |
845 | } | |
846 | ||
847 | counter_len = error_counter_conf->dimensions[0].size; | |
848 | dimensions[0].size = counter_len; | |
849 | dimensions[0].underflow_index = 0; | |
850 | dimensions[0].overflow_index = 0; | |
851 | dimensions[0].has_underflow = 0; | |
852 | dimensions[0].has_overflow = 0; | |
853 | ||
854 | counter = lttng_ust_counter_create(counter_transport_name, 1, dimensions); | |
855 | if (!counter) { | |
856 | ret = -EINVAL; | |
857 | goto create_error; | |
858 | } | |
859 | ||
ebabbf58 | 860 | event_notifier_group->error_counter_len = counter_len; |
33f43caa MD |
861 | /* |
862 | * store-release to publish error counter matches load-acquire | |
863 | * in record_error. Ensures the counter is created and the | |
864 | * error_counter_len is set before they are used. | |
865 | * Currently a full memory barrier is used, which could be | |
866 | * turned into acquire-release barriers. | |
867 | */ | |
868 | cmm_smp_mb(); | |
869 | CMM_STORE_SHARED(event_notifier_group->error_counter, counter); | |
ebabbf58 MD |
870 | |
871 | counter->objd = counter_objd; | |
872 | counter->event_notifier_group = event_notifier_group; /* owner */ | |
873 | ||
874 | objd_set_private(counter_objd, counter); | |
875 | /* The error counter holds a reference on the event_notifier group. */ | |
876 | objd_ref(event_notifier_group->objd); | |
877 | ||
878 | return counter_objd; | |
879 | ||
880 | create_error: | |
881 | { | |
882 | int err; | |
883 | ||
fd17d7ce | 884 | err = lttng_ust_abi_objd_unref(counter_objd, 1); |
ebabbf58 MD |
885 | assert(!err); |
886 | } | |
887 | objd_error: | |
888 | return ret; | |
889 | } | |
890 | ||
d8d2416d FD |
891 | static |
892 | long lttng_event_notifier_group_cmd(int objd, unsigned int cmd, unsigned long arg, | |
fd17d7ce | 893 | union lttng_ust_abi_args *uargs, void *owner) |
d8d2416d FD |
894 | { |
895 | switch (cmd) { | |
fd17d7ce | 896 | case LTTNG_UST_ABI_EVENT_NOTIFIER_CREATE: |
d8d2416d | 897 | { |
fd17d7ce MD |
898 | struct lttng_ust_abi_event_notifier *event_notifier_param = |
899 | (struct lttng_ust_abi_event_notifier *) arg; | |
d8d2416d FD |
900 | if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) { |
901 | /* | |
902 | * If the event name is a star globbing pattern, | |
903 | * we create the special star globbing enabler. | |
904 | */ | |
905 | return lttng_ust_event_notifier_enabler_create(objd, | |
906 | owner, event_notifier_param, | |
907 | LTTNG_ENABLER_FORMAT_STAR_GLOB); | |
908 | } else { | |
909 | return lttng_ust_event_notifier_enabler_create(objd, | |
910 | owner, event_notifier_param, | |
911 | LTTNG_ENABLER_FORMAT_EVENT); | |
912 | } | |
913 | } | |
fd17d7ce | 914 | case LTTNG_UST_ABI_COUNTER: |
ebabbf58 | 915 | { |
fd17d7ce MD |
916 | struct lttng_ust_abi_counter_conf *counter_conf = |
917 | (struct lttng_ust_abi_counter_conf *) uargs->counter.counter_data; | |
ebabbf58 MD |
918 | return lttng_ust_event_notifier_group_create_error_counter( |
919 | objd, owner, counter_conf); | |
920 | } | |
d8d2416d FD |
921 | default: |
922 | return -EINVAL; | |
923 | } | |
924 | } | |
925 | ||
926 | static | |
927 | int lttng_event_notifier_enabler_release(int objd) | |
928 | { | |
929 | struct lttng_event_notifier_enabler *event_notifier_enabler = objd_private(objd); | |
930 | ||
931 | if (event_notifier_enabler) | |
fd17d7ce | 932 | return lttng_ust_abi_objd_unref(event_notifier_enabler->group->objd, 0); |
d8d2416d FD |
933 | return 0; |
934 | } | |
935 | ||
fd17d7ce | 936 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_enabler_ops = { |
d8d2416d FD |
937 | .release = lttng_event_notifier_enabler_release, |
938 | .cmd = lttng_event_notifier_enabler_cmd, | |
939 | }; | |
940 | ||
941 | static | |
942 | int lttng_release_event_notifier_group(int objd) | |
943 | { | |
944 | struct lttng_event_notifier_group *event_notifier_group = objd_private(objd); | |
945 | ||
946 | if (event_notifier_group) { | |
947 | lttng_event_notifier_group_destroy(event_notifier_group); | |
948 | return 0; | |
949 | } else { | |
950 | return -EINVAL; | |
951 | } | |
952 | } | |
953 | ||
fd17d7ce | 954 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_ops = { |
d8d2416d FD |
955 | .release = lttng_release_event_notifier_group, |
956 | .cmd = lttng_event_notifier_group_cmd, | |
957 | }; | |
958 | ||
51489cad | 959 | static |
ef9ff354 | 960 | long lttng_tracepoint_list_cmd(int objd, unsigned int cmd, unsigned long arg, |
2208d8b5 MJ |
961 | union lttng_ust_abi_args *uargs __attribute__((unused)), |
962 | void *owner __attribute__((unused))) | |
51489cad | 963 | { |
c8fcf224 | 964 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
fd17d7ce MD |
965 | struct lttng_ust_abi_tracepoint_iter *tp = |
966 | (struct lttng_ust_abi_tracepoint_iter *) arg; | |
967 | struct lttng_ust_abi_tracepoint_iter *iter; | |
51489cad MD |
968 | |
969 | switch (cmd) { | |
fd17d7ce | 970 | case LTTNG_UST_ABI_TRACEPOINT_LIST_GET: |
c8fcf224 | 971 | { |
c8fcf224 MD |
972 | iter = lttng_ust_tracepoint_list_get_iter_next(list); |
973 | if (!iter) | |
7bc53e94 | 974 | return -LTTNG_UST_ERR_NOENT; |
c8fcf224 | 975 | memcpy(tp, iter, sizeof(*tp)); |
51489cad | 976 | return 0; |
c8fcf224 | 977 | } |
51489cad MD |
978 | default: |
979 | return -EINVAL; | |
980 | } | |
981 | } | |
982 | ||
983 | static | |
f59ed768 | 984 | int lttng_abi_tracepoint_list(void *owner) |
51489cad MD |
985 | { |
986 | int list_objd, ret; | |
c8fcf224 | 987 | struct lttng_ust_tracepoint_list *list; |
51489cad | 988 | |
7047f3da | 989 | list_objd = objd_alloc(NULL, <tng_tracepoint_list_ops, owner, "tp_list"); |
51489cad MD |
990 | if (list_objd < 0) { |
991 | ret = list_objd; | |
992 | goto objd_error; | |
993 | } | |
994 | list = zmalloc(sizeof(*list)); | |
995 | if (!list) { | |
996 | ret = -ENOMEM; | |
997 | goto alloc_error; | |
998 | } | |
999 | objd_set_private(list_objd, list); | |
1000 | ||
c8fcf224 | 1001 | /* populate list by walking on all registered probes. */ |
7dd08bec | 1002 | ret = lttng_probes_get_event_list(list); |
c8fcf224 MD |
1003 | if (ret) { |
1004 | goto list_error; | |
1005 | } | |
51489cad MD |
1006 | return list_objd; |
1007 | ||
c8fcf224 MD |
1008 | list_error: |
1009 | free(list); | |
51489cad MD |
1010 | alloc_error: |
1011 | { | |
1012 | int err; | |
1013 | ||
fd17d7ce | 1014 | err = lttng_ust_abi_objd_unref(list_objd, 1); |
51489cad MD |
1015 | assert(!err); |
1016 | } | |
1017 | objd_error: | |
1018 | return ret; | |
1019 | } | |
1020 | ||
1021 | static | |
1022 | int lttng_release_tracepoint_list(int objd) | |
1023 | { | |
c8fcf224 | 1024 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
51489cad MD |
1025 | |
1026 | if (list) { | |
7dd08bec | 1027 | lttng_probes_prune_event_list(list); |
51489cad MD |
1028 | free(list); |
1029 | return 0; | |
1030 | } else { | |
1031 | return -EINVAL; | |
1032 | } | |
1033 | } | |
1034 | ||
fd17d7ce | 1035 | static const struct lttng_ust_abi_objd_ops lttng_tracepoint_list_ops = { |
51489cad MD |
1036 | .release = lttng_release_tracepoint_list, |
1037 | .cmd = lttng_tracepoint_list_cmd, | |
1038 | }; | |
1039 | ||
06d4f27e MD |
1040 | static |
1041 | long lttng_tracepoint_field_list_cmd(int objd, unsigned int cmd, | |
2208d8b5 MJ |
1042 | unsigned long arg __attribute__((unused)), union lttng_ust_abi_args *uargs, |
1043 | void *owner __attribute__((unused))) | |
06d4f27e MD |
1044 | { |
1045 | struct lttng_ust_field_list *list = objd_private(objd); | |
fd17d7ce MD |
1046 | struct lttng_ust_abi_field_iter *tp = &uargs->field_list.entry; |
1047 | struct lttng_ust_abi_field_iter *iter; | |
06d4f27e MD |
1048 | |
1049 | switch (cmd) { | |
fd17d7ce | 1050 | case LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST_GET: |
06d4f27e | 1051 | { |
06d4f27e MD |
1052 | iter = lttng_ust_field_list_get_iter_next(list); |
1053 | if (!iter) | |
7bc53e94 | 1054 | return -LTTNG_UST_ERR_NOENT; |
06d4f27e MD |
1055 | memcpy(tp, iter, sizeof(*tp)); |
1056 | return 0; | |
1057 | } | |
1058 | default: | |
1059 | return -EINVAL; | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | static | |
f59ed768 | 1064 | int lttng_abi_tracepoint_field_list(void *owner) |
06d4f27e MD |
1065 | { |
1066 | int list_objd, ret; | |
1067 | struct lttng_ust_field_list *list; | |
1068 | ||
7047f3da MD |
1069 | list_objd = objd_alloc(NULL, <tng_tracepoint_field_list_ops, owner, |
1070 | "tp_field_list"); | |
06d4f27e MD |
1071 | if (list_objd < 0) { |
1072 | ret = list_objd; | |
1073 | goto objd_error; | |
1074 | } | |
1075 | list = zmalloc(sizeof(*list)); | |
1076 | if (!list) { | |
1077 | ret = -ENOMEM; | |
1078 | goto alloc_error; | |
1079 | } | |
1080 | objd_set_private(list_objd, list); | |
1081 | ||
1082 | /* populate list by walking on all registered probes. */ | |
7dd08bec | 1083 | ret = lttng_probes_get_field_list(list); |
06d4f27e MD |
1084 | if (ret) { |
1085 | goto list_error; | |
1086 | } | |
1087 | return list_objd; | |
1088 | ||
1089 | list_error: | |
1090 | free(list); | |
1091 | alloc_error: | |
1092 | { | |
1093 | int err; | |
1094 | ||
fd17d7ce | 1095 | err = lttng_ust_abi_objd_unref(list_objd, 1); |
06d4f27e MD |
1096 | assert(!err); |
1097 | } | |
1098 | objd_error: | |
1099 | return ret; | |
1100 | } | |
1101 | ||
1102 | static | |
1103 | int lttng_release_tracepoint_field_list(int objd) | |
1104 | { | |
1105 | struct lttng_ust_field_list *list = objd_private(objd); | |
1106 | ||
1107 | if (list) { | |
7dd08bec | 1108 | lttng_probes_prune_field_list(list); |
06d4f27e MD |
1109 | free(list); |
1110 | return 0; | |
1111 | } else { | |
1112 | return -EINVAL; | |
1113 | } | |
1114 | } | |
1115 | ||
fd17d7ce | 1116 | static const struct lttng_ust_abi_objd_ops lttng_tracepoint_field_list_ops = { |
06d4f27e MD |
1117 | .release = lttng_release_tracepoint_field_list, |
1118 | .cmd = lttng_tracepoint_field_list_cmd, | |
1119 | }; | |
1120 | ||
f4681817 | 1121 | static |
fd17d7ce | 1122 | int lttng_abi_map_stream(int channel_objd, struct lttng_ust_abi_stream *info, |
2208d8b5 | 1123 | union lttng_ust_abi_args *uargs, void *owner __attribute__((unused))) |
f4681817 | 1124 | { |
e7bc0ef6 | 1125 | struct lttng_ust_channel_buffer *lttng_chan_buf = objd_private(channel_objd); |
74d81a6c | 1126 | int ret; |
f4681817 | 1127 | |
07539b34 | 1128 | ret = channel_handle_add_stream(lttng_chan_buf->priv->rb_chan->handle, |
74d81a6c MD |
1129 | uargs->stream.shm_fd, uargs->stream.wakeup_fd, |
1130 | info->stream_nr, info->len); | |
1131 | if (ret) | |
1132 | goto error_add_stream; | |
118c051e MD |
1133 | /* Take ownership of shm_fd and wakeup_fd. */ |
1134 | uargs->stream.shm_fd = -1; | |
1135 | uargs->stream.wakeup_fd = -1; | |
74d81a6c MD |
1136 | |
1137 | return 0; | |
1138 | ||
1139 | error_add_stream: | |
f4681817 MD |
1140 | return ret; |
1141 | } | |
f4681817 MD |
1142 | |
1143 | static | |
d871c65b | 1144 | int lttng_abi_create_event_enabler(int channel_objd, |
fd17d7ce | 1145 | struct lttng_ust_abi_event *event_param, |
e58095ef | 1146 | void *owner, |
e450e339 | 1147 | enum lttng_enabler_format_type format_type) |
f4681817 | 1148 | { |
e7bc0ef6 | 1149 | struct lttng_ust_channel_buffer *channel = objd_private(channel_objd); |
d871c65b | 1150 | struct lttng_event_enabler *enabler; |
f4681817 MD |
1151 | int event_objd, ret; |
1152 | ||
fd17d7ce | 1153 | event_param->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; |
d871c65b FD |
1154 | event_objd = objd_alloc(NULL, <tng_event_enabler_ops, owner, |
1155 | "event enabler"); | |
f4681817 MD |
1156 | if (event_objd < 0) { |
1157 | ret = event_objd; | |
1158 | goto objd_error; | |
1159 | } | |
1160 | /* | |
1161 | * We tolerate no failure path after event creation. It will stay | |
1162 | * invariant for the rest of the session. | |
1163 | */ | |
d871c65b | 1164 | enabler = lttng_event_enabler_create(format_type, event_param, channel); |
e58095ef MD |
1165 | if (!enabler) { |
1166 | ret = -ENOMEM; | |
f4681817 MD |
1167 | goto event_error; |
1168 | } | |
e58095ef | 1169 | objd_set_private(event_objd, enabler); |
f4681817 MD |
1170 | /* The event holds a reference on the channel */ |
1171 | objd_ref(channel_objd); | |
1172 | return event_objd; | |
1173 | ||
1174 | event_error: | |
1ea11eab MD |
1175 | { |
1176 | int err; | |
1177 | ||
fd17d7ce | 1178 | err = lttng_ust_abi_objd_unref(event_objd, 1); |
1ea11eab MD |
1179 | assert(!err); |
1180 | } | |
f4681817 MD |
1181 | objd_error: |
1182 | return ret; | |
1183 | } | |
1184 | ||
1185 | /** | |
1186 | * lttng_channel_cmd - lttng control through object descriptors | |
1187 | * | |
1188 | * @objd: the object descriptor | |
1189 | * @cmd: the command | |
1190 | * @arg: command arg | |
ef9ff354 | 1191 | * @uargs: UST arguments (internal) |
f59ed768 | 1192 | * @owner: objd owner |
f4681817 MD |
1193 | * |
1194 | * This object descriptor implements lttng commands: | |
fd17d7ce | 1195 | * LTTNG_UST_ABI_STREAM |
f4681817 MD |
1196 | * Returns an event stream object descriptor or failure. |
1197 | * (typically, one event stream records events from one CPU) | |
fd17d7ce | 1198 | * LTTNG_UST_ABI_EVENT |
f4681817 | 1199 | * Returns an event object descriptor or failure. |
fd17d7ce | 1200 | * LTTNG_UST_ABI_CONTEXT |
f4681817 | 1201 | * Prepend a context field to each event in the channel |
fd17d7ce | 1202 | * LTTNG_UST_ABI_ENABLE |
f4681817 | 1203 | * Enable recording for events in this channel (weak enable) |
fd17d7ce | 1204 | * LTTNG_UST_ABI_DISABLE |
f4681817 MD |
1205 | * Disable recording for events in this channel (strong disable) |
1206 | * | |
1207 | * Channel and event file descriptors also hold a reference on the session. | |
1208 | */ | |
1209 | static | |
ef9ff354 | 1210 | long lttng_channel_cmd(int objd, unsigned int cmd, unsigned long arg, |
fd17d7ce | 1211 | union lttng_ust_abi_args *uargs, void *owner) |
f4681817 | 1212 | { |
e7bc0ef6 | 1213 | struct lttng_ust_channel_buffer *lttng_chan_buf = objd_private(objd); |
f4681817 | 1214 | |
fd17d7ce | 1215 | if (cmd != LTTNG_UST_ABI_STREAM) { |
74d81a6c MD |
1216 | /* |
1217 | * Check if channel received all streams. | |
1218 | */ | |
e7bc0ef6 | 1219 | if (!lttng_is_channel_ready(lttng_chan_buf)) |
74d81a6c MD |
1220 | return -EPERM; |
1221 | } | |
1222 | ||
f4681817 | 1223 | switch (cmd) { |
fd17d7ce | 1224 | case LTTNG_UST_ABI_STREAM: |
381c0f1e | 1225 | { |
fd17d7ce | 1226 | struct lttng_ust_abi_stream *stream; |
381c0f1e | 1227 | |
fd17d7ce | 1228 | stream = (struct lttng_ust_abi_stream *) arg; |
381c0f1e | 1229 | /* stream used as output */ |
74d81a6c | 1230 | return lttng_abi_map_stream(objd, stream, uargs, owner); |
381c0f1e | 1231 | } |
fd17d7ce | 1232 | case LTTNG_UST_ABI_EVENT: |
1f18504e | 1233 | { |
fd17d7ce MD |
1234 | struct lttng_ust_abi_event *event_param = |
1235 | (struct lttng_ust_abi_event *) arg; | |
196ec2df PP |
1236 | |
1237 | if (strutils_is_star_glob_pattern(event_param->name)) { | |
1238 | /* | |
1239 | * If the event name is a star globbing pattern, | |
1240 | * we create the special star globbing enabler. | |
1241 | */ | |
d871c65b | 1242 | return lttng_abi_create_event_enabler(objd, event_param, |
e450e339 | 1243 | owner, LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f18504e | 1244 | } else { |
d871c65b | 1245 | return lttng_abi_create_event_enabler(objd, event_param, |
e450e339 | 1246 | owner, LTTNG_ENABLER_FORMAT_EVENT); |
1f18504e MD |
1247 | } |
1248 | } | |
fd17d7ce | 1249 | case LTTNG_UST_ABI_CONTEXT: |
f4681817 | 1250 | return lttng_abi_add_context(objd, |
fd17d7ce | 1251 | (struct lttng_ust_abi_context *) arg, uargs, |
0950190a | 1252 | <tng_chan_buf->priv->ctx, |
e7bc0ef6 | 1253 | lttng_chan_buf->parent->session); |
fd17d7ce | 1254 | case LTTNG_UST_ABI_ENABLE: |
e7bc0ef6 | 1255 | return lttng_channel_enable(lttng_chan_buf->parent); |
fd17d7ce | 1256 | case LTTNG_UST_ABI_DISABLE: |
e7bc0ef6 | 1257 | return lttng_channel_disable(lttng_chan_buf->parent); |
fd17d7ce | 1258 | case LTTNG_UST_ABI_FLUSH_BUFFER: |
07539b34 | 1259 | return lttng_chan_buf->ops->priv->flush_buffer(lttng_chan_buf); |
f4681817 MD |
1260 | default: |
1261 | return -EINVAL; | |
1262 | } | |
1263 | } | |
1264 | ||
f4681817 MD |
1265 | static |
1266 | int lttng_channel_release(int objd) | |
1267 | { | |
e7bc0ef6 | 1268 | struct lttng_ust_channel_buffer *lttng_chan_buf = objd_private(objd); |
f4681817 | 1269 | |
e7bc0ef6 MD |
1270 | if (lttng_chan_buf) |
1271 | return lttng_ust_abi_objd_unref(lttng_chan_buf->parent->session->priv->objd, 0); | |
f4681817 MD |
1272 | return 0; |
1273 | } | |
1274 | ||
fd17d7ce | 1275 | static const struct lttng_ust_abi_objd_ops lttng_channel_ops = { |
f4681817 | 1276 | .release = lttng_channel_release, |
f4681817 MD |
1277 | .cmd = lttng_channel_cmd, |
1278 | }; | |
1279 | ||
f4681817 | 1280 | /** |
e58095ef | 1281 | * lttng_enabler_cmd - lttng control through object descriptors |
e6c12e3d MD |
1282 | * |
1283 | * @objd: the object descriptor | |
1284 | * @cmd: the command | |
1285 | * @arg: command arg | |
ef9ff354 | 1286 | * @uargs: UST arguments (internal) |
f59ed768 | 1287 | * @owner: objd owner |
e6c12e3d MD |
1288 | * |
1289 | * This object descriptor implements lttng commands: | |
fd17d7ce | 1290 | * LTTNG_UST_ABI_CONTEXT |
e6c12e3d | 1291 | * Prepend a context field to each record of events of this |
e58095ef | 1292 | * enabler. |
fd17d7ce | 1293 | * LTTNG_UST_ABI_ENABLE |
e58095ef | 1294 | * Enable recording for this enabler |
fd17d7ce | 1295 | * LTTNG_UST_ABI_DISABLE |
e58095ef | 1296 | * Disable recording for this enabler |
fd17d7ce | 1297 | * LTTNG_UST_ABI_FILTER |
e58095ef | 1298 | * Attach a filter to an enabler. |
fd17d7ce | 1299 | * LTTNG_UST_ABI_EXCLUSION |
0bfb5cbd | 1300 | * Attach exclusions to an enabler. |
e6c12e3d MD |
1301 | */ |
1302 | static | |
d871c65b | 1303 | long lttng_event_enabler_cmd(int objd, unsigned int cmd, unsigned long arg, |
2208d8b5 MJ |
1304 | union lttng_ust_abi_args *uargs __attribute__((unused)), |
1305 | void *owner __attribute__((unused))) | |
e6c12e3d | 1306 | { |
d871c65b | 1307 | struct lttng_event_enabler *enabler = objd_private(objd); |
e6c12e3d MD |
1308 | |
1309 | switch (cmd) { | |
fd17d7ce | 1310 | case LTTNG_UST_ABI_CONTEXT: |
d871c65b | 1311 | return lttng_event_enabler_attach_context(enabler, |
fd17d7ce MD |
1312 | (struct lttng_ust_abi_context *) arg); |
1313 | case LTTNG_UST_ABI_ENABLE: | |
d871c65b | 1314 | return lttng_event_enabler_enable(enabler); |
fd17d7ce | 1315 | case LTTNG_UST_ABI_DISABLE: |
d871c65b | 1316 | return lttng_event_enabler_disable(enabler); |
fd17d7ce | 1317 | case LTTNG_UST_ABI_FILTER: |
2d78951a MD |
1318 | { |
1319 | int ret; | |
1320 | ||
a56fd376 | 1321 | ret = lttng_event_enabler_attach_filter_bytecode(enabler, |
ab89263e | 1322 | (struct lttng_ust_bytecode_node **) arg); |
2d78951a MD |
1323 | if (ret) |
1324 | return ret; | |
2d78951a MD |
1325 | return 0; |
1326 | } | |
fd17d7ce | 1327 | case LTTNG_UST_ABI_EXCLUSION: |
0bfb5cbd | 1328 | { |
d871c65b | 1329 | return lttng_event_enabler_attach_exclusion(enabler, |
e9fe6aad | 1330 | (struct lttng_ust_excluder_node **) arg); |
0bfb5cbd | 1331 | } |
e6c12e3d MD |
1332 | default: |
1333 | return -EINVAL; | |
1334 | } | |
1335 | } | |
1336 | ||
1337 | static | |
d871c65b | 1338 | int lttng_event_enabler_release(int objd) |
e6c12e3d | 1339 | { |
d871c65b FD |
1340 | struct lttng_event_enabler *event_enabler = objd_private(objd); |
1341 | ||
1342 | if (event_enabler) | |
e7bc0ef6 | 1343 | return lttng_ust_abi_objd_unref(event_enabler->chan->priv->parent.objd, 0); |
e6c12e3d | 1344 | |
e6c12e3d MD |
1345 | return 0; |
1346 | } | |
1347 | ||
fd17d7ce | 1348 | static const struct lttng_ust_abi_objd_ops lttng_event_enabler_ops = { |
d871c65b FD |
1349 | .release = lttng_event_enabler_release, |
1350 | .cmd = lttng_event_enabler_cmd, | |
e6c12e3d MD |
1351 | }; |
1352 | ||
b35d179d | 1353 | void lttng_ust_abi_exit(void) |
f4681817 | 1354 | { |
45e9e699 | 1355 | lttng_ust_abi_close_in_progress = 1; |
701a658f | 1356 | ust_lock_nocheck(); |
f4681817 | 1357 | objd_table_destroy(); |
701a658f | 1358 | ust_unlock(); |
45e9e699 | 1359 | lttng_ust_abi_close_in_progress = 0; |
f4681817 | 1360 | } |