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> |
6548fca4 | 38 | #include <ust-fd.h> |
44c72f10 | 39 | #include <usterr-signal-safe.h> |
fb31eb73 FD |
40 | |
41 | #include "../libringbuffer/frontend_types.h" | |
42 | #include "../libringbuffer/shm.h" | |
ebabbf58 | 43 | #include "../libcounter/counter.h" |
10544ee8 | 44 | #include "tracepoint-internal.h" |
7dd08bec | 45 | #include "lttng-tracer.h" |
196ec2df | 46 | #include "string-utils.h" |
d871c65b | 47 | #include "ust-events-internal.h" |
fc80554e | 48 | #include "context-internal.h" |
ddabe860 | 49 | #include "ust-helper.h" |
4ab44fbe | 50 | |
7047f3da MD |
51 | #define OBJ_NAME_LEN 16 |
52 | ||
45e9e699 MD |
53 | static int lttng_ust_abi_close_in_progress; |
54 | ||
51489cad | 55 | static |
f59ed768 | 56 | int lttng_abi_tracepoint_list(void *owner); |
06d4f27e | 57 | static |
f59ed768 | 58 | int lttng_abi_tracepoint_field_list(void *owner); |
51489cad | 59 | |
f4681817 MD |
60 | /* |
61 | * Object descriptor table. Should be protected from concurrent access | |
62 | * by the caller. | |
63 | */ | |
64 | ||
fd17d7ce | 65 | struct lttng_ust_abi_obj { |
f4681817 MD |
66 | union { |
67 | struct { | |
68 | void *private_data; | |
fd17d7ce | 69 | const struct lttng_ust_abi_objd_ops *ops; |
f4681817 | 70 | int f_count; |
1849ef7c | 71 | int owner_ref; /* has ref from owner */ |
f59ed768 | 72 | void *owner; |
7047f3da | 73 | char name[OBJ_NAME_LEN]; |
f4681817 MD |
74 | } s; |
75 | int freelist_next; /* offset freelist. end is -1. */ | |
76 | } u; | |
77 | }; | |
78 | ||
fd17d7ce MD |
79 | struct lttng_ust_abi_objd_table { |
80 | struct lttng_ust_abi_obj *array; | |
f4681817 MD |
81 | unsigned int len, allocated_len; |
82 | int freelist_head; /* offset freelist head. end is -1 */ | |
83 | }; | |
84 | ||
fd17d7ce | 85 | static struct lttng_ust_abi_objd_table objd_table = { |
f4681817 MD |
86 | .freelist_head = -1, |
87 | }; | |
88 | ||
89 | static | |
fd17d7ce | 90 | int objd_alloc(void *private_data, const struct lttng_ust_abi_objd_ops *ops, |
7047f3da | 91 | void *owner, const char *name) |
f4681817 | 92 | { |
fd17d7ce | 93 | struct lttng_ust_abi_obj *obj; |
f4681817 MD |
94 | |
95 | if (objd_table.freelist_head != -1) { | |
96 | obj = &objd_table.array[objd_table.freelist_head]; | |
97 | objd_table.freelist_head = obj->u.freelist_next; | |
98 | goto end; | |
99 | } | |
100 | ||
101 | if (objd_table.len >= objd_table.allocated_len) { | |
102 | unsigned int new_allocated_len, old_allocated_len; | |
fd17d7ce | 103 | struct lttng_ust_abi_obj *new_table, *old_table; |
f4681817 MD |
104 | |
105 | old_allocated_len = objd_table.allocated_len; | |
106 | old_table = objd_table.array; | |
107 | if (!old_allocated_len) | |
108 | new_allocated_len = 1; | |
109 | else | |
110 | new_allocated_len = old_allocated_len << 1; | |
fd17d7ce | 111 | new_table = zmalloc(sizeof(struct lttng_ust_abi_obj) * new_allocated_len); |
f4681817 MD |
112 | if (!new_table) |
113 | return -ENOMEM; | |
114 | memcpy(new_table, old_table, | |
fd17d7ce | 115 | sizeof(struct lttng_ust_abi_obj) * old_allocated_len); |
f4681817 MD |
116 | free(old_table); |
117 | objd_table.array = new_table; | |
118 | objd_table.allocated_len = new_allocated_len; | |
119 | } | |
120 | obj = &objd_table.array[objd_table.len]; | |
121 | objd_table.len++; | |
122 | end: | |
123 | obj->u.s.private_data = private_data; | |
124 | obj->u.s.ops = ops; | |
a4be8962 MD |
125 | obj->u.s.f_count = 2; /* count == 1 : object is allocated */ |
126 | /* count == 2 : allocated + hold ref */ | |
1849ef7c | 127 | obj->u.s.owner_ref = 1; /* One owner reference */ |
f59ed768 | 128 | obj->u.s.owner = owner; |
7047f3da MD |
129 | strncpy(obj->u.s.name, name, OBJ_NAME_LEN); |
130 | obj->u.s.name[OBJ_NAME_LEN - 1] = '\0'; | |
f4681817 MD |
131 | return obj - objd_table.array; |
132 | } | |
133 | ||
134 | static | |
fd17d7ce | 135 | struct lttng_ust_abi_obj *_objd_get(int id) |
f4681817 MD |
136 | { |
137 | if (id >= objd_table.len) | |
138 | return NULL; | |
a4be8962 MD |
139 | if (!objd_table.array[id].u.s.f_count) |
140 | return NULL; | |
f4681817 MD |
141 | return &objd_table.array[id]; |
142 | } | |
143 | ||
144 | static | |
145 | void *objd_private(int id) | |
146 | { | |
fd17d7ce | 147 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
f4681817 MD |
148 | assert(obj); |
149 | return obj->u.s.private_data; | |
150 | } | |
151 | ||
152 | static | |
153 | void objd_set_private(int id, void *private_data) | |
154 | { | |
fd17d7ce | 155 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
f4681817 MD |
156 | assert(obj); |
157 | obj->u.s.private_data = private_data; | |
158 | } | |
159 | ||
fd17d7ce | 160 | const struct lttng_ust_abi_objd_ops *lttng_ust_abi_objd_ops(int id) |
f4681817 | 161 | { |
fd17d7ce | 162 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
46050b1a | 163 | |
a4be8962 MD |
164 | if (!obj) |
165 | return NULL; | |
f4681817 MD |
166 | return obj->u.s.ops; |
167 | } | |
168 | ||
169 | static | |
170 | void objd_free(int id) | |
171 | { | |
fd17d7ce | 172 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
f4681817 MD |
173 | |
174 | assert(obj); | |
175 | obj->u.freelist_next = objd_table.freelist_head; | |
176 | objd_table.freelist_head = obj - objd_table.array; | |
a4be8962 MD |
177 | assert(obj->u.s.f_count == 1); |
178 | obj->u.s.f_count = 0; /* deallocated */ | |
f4681817 MD |
179 | } |
180 | ||
181 | static | |
182 | void objd_ref(int id) | |
183 | { | |
fd17d7ce | 184 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
072886c4 | 185 | assert(obj != NULL); |
f4681817 MD |
186 | obj->u.s.f_count++; |
187 | } | |
188 | ||
fd17d7ce | 189 | int lttng_ust_abi_objd_unref(int id, int is_owner) |
f4681817 | 190 | { |
fd17d7ce | 191 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
f4681817 | 192 | |
1ea11eab MD |
193 | if (!obj) |
194 | return -EINVAL; | |
a4be8962 MD |
195 | if (obj->u.s.f_count == 1) { |
196 | ERR("Reference counting error\n"); | |
197 | return -EINVAL; | |
198 | } | |
1849ef7c MD |
199 | if (is_owner) { |
200 | if (!obj->u.s.owner_ref) { | |
201 | ERR("Error decrementing owner reference"); | |
202 | return -EINVAL; | |
203 | } | |
204 | obj->u.s.owner_ref--; | |
205 | } | |
a4be8962 | 206 | if ((--obj->u.s.f_count) == 1) { |
fd17d7ce | 207 | const struct lttng_ust_abi_objd_ops *ops = lttng_ust_abi_objd_ops(id); |
196ec2df | 208 | |
f4681817 MD |
209 | if (ops->release) |
210 | ops->release(id); | |
211 | objd_free(id); | |
212 | } | |
1ea11eab | 213 | return 0; |
f4681817 MD |
214 | } |
215 | ||
216 | static | |
217 | void objd_table_destroy(void) | |
218 | { | |
a4be8962 MD |
219 | int i; |
220 | ||
1849ef7c | 221 | for (i = 0; i < objd_table.allocated_len; i++) { |
fd17d7ce | 222 | struct lttng_ust_abi_obj *obj; |
1849ef7c MD |
223 | |
224 | obj = _objd_get(i); | |
225 | if (!obj) | |
226 | continue; | |
227 | if (!obj->u.s.owner_ref) | |
228 | continue; /* only unref owner ref. */ | |
fd17d7ce | 229 | (void) lttng_ust_abi_objd_unref(i, 1); |
1849ef7c | 230 | } |
f4681817 | 231 | free(objd_table.array); |
02fb3381 MD |
232 | objd_table.array = NULL; |
233 | objd_table.len = 0; | |
234 | objd_table.allocated_len = 0; | |
17dfb34b | 235 | objd_table.freelist_head = -1; |
f4681817 MD |
236 | } |
237 | ||
74d81a6c MD |
238 | const char *lttng_ust_obj_get_name(int id) |
239 | { | |
fd17d7ce | 240 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
74d81a6c MD |
241 | |
242 | if (!obj) | |
243 | return NULL; | |
244 | return obj->u.s.name; | |
245 | } | |
246 | ||
fd17d7ce | 247 | void lttng_ust_abi_objd_table_owner_cleanup(void *owner) |
f59ed768 MD |
248 | { |
249 | int i; | |
250 | ||
251 | for (i = 0; i < objd_table.allocated_len; i++) { | |
fd17d7ce | 252 | struct lttng_ust_abi_obj *obj; |
f59ed768 MD |
253 | |
254 | obj = _objd_get(i); | |
255 | if (!obj) | |
256 | continue; | |
257 | if (!obj->u.s.owner) | |
258 | continue; /* skip root handles */ | |
1849ef7c MD |
259 | if (!obj->u.s.owner_ref) |
260 | continue; /* only unref owner ref. */ | |
f59ed768 | 261 | if (obj->u.s.owner == owner) |
fd17d7ce | 262 | (void) lttng_ust_abi_objd_unref(i, 1); |
f59ed768 MD |
263 | } |
264 | } | |
265 | ||
f4681817 MD |
266 | /* |
267 | * This is LTTng's own personal way to create an ABI for sessiond. | |
268 | * We send commands over a socket. | |
269 | */ | |
270 | ||
fd17d7ce MD |
271 | static const struct lttng_ust_abi_objd_ops lttng_ops; |
272 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_ops; | |
273 | static const struct lttng_ust_abi_objd_ops lttng_session_ops; | |
274 | static const struct lttng_ust_abi_objd_ops lttng_channel_ops; | |
275 | static const struct lttng_ust_abi_objd_ops lttng_event_enabler_ops; | |
276 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_enabler_ops; | |
277 | static const struct lttng_ust_abi_objd_ops lttng_tracepoint_list_ops; | |
278 | static const struct lttng_ust_abi_objd_ops lttng_tracepoint_field_list_ops; | |
f4681817 | 279 | |
46050b1a MD |
280 | int lttng_abi_create_root_handle(void) |
281 | { | |
282 | int root_handle; | |
283 | ||
f59ed768 | 284 | /* root handles have NULL owners */ |
7047f3da | 285 | root_handle = objd_alloc(NULL, <tng_ops, NULL, "root"); |
46050b1a MD |
286 | return root_handle; |
287 | } | |
288 | ||
74d81a6c MD |
289 | static |
290 | int lttng_is_channel_ready(struct lttng_channel *lttng_chan) | |
291 | { | |
5198080d | 292 | struct lttng_ust_lib_ring_buffer_channel *chan; |
74d81a6c MD |
293 | unsigned int nr_streams, exp_streams; |
294 | ||
295 | chan = lttng_chan->chan; | |
296 | nr_streams = channel_handle_get_nr_streams(lttng_chan->handle); | |
297 | exp_streams = chan->nr_streams; | |
298 | return nr_streams == exp_streams; | |
299 | } | |
300 | ||
818173b9 | 301 | static |
f59ed768 | 302 | int lttng_abi_create_session(void *owner) |
f4681817 | 303 | { |
f69fe5fb | 304 | struct lttng_ust_session *session; |
f4681817 MD |
305 | int session_objd, ret; |
306 | ||
7dd08bec | 307 | session = lttng_session_create(); |
f4681817 MD |
308 | if (!session) |
309 | return -ENOMEM; | |
7047f3da | 310 | session_objd = objd_alloc(session, <tng_session_ops, owner, "session"); |
f4681817 MD |
311 | if (session_objd < 0) { |
312 | ret = session_objd; | |
313 | goto objd_error; | |
314 | } | |
bdb12629 MD |
315 | session->priv->objd = session_objd; |
316 | session->priv->owner = owner; | |
f4681817 MD |
317 | return session_objd; |
318 | ||
319 | objd_error: | |
7dd08bec | 320 | lttng_session_destroy(session); |
f4681817 MD |
321 | return ret; |
322 | } | |
323 | ||
f4681817 MD |
324 | static |
325 | long lttng_abi_tracer_version(int objd, | |
fd17d7ce | 326 | struct lttng_ust_abi_tracer_version *v) |
f4681817 | 327 | { |
32ce8569 MD |
328 | v->major = LTTNG_UST_MAJOR_VERSION; |
329 | v->minor = LTTNG_UST_MINOR_VERSION; | |
330 | v->patchlevel = LTTNG_UST_PATCHLEVEL_VERSION; | |
f4681817 MD |
331 | return 0; |
332 | } | |
333 | ||
d8d2416d | 334 | static |
f52e5902 | 335 | int lttng_abi_event_notifier_send_fd(void *owner, int *event_notifier_notif_fd) |
d8d2416d FD |
336 | { |
337 | struct lttng_event_notifier_group *event_notifier_group; | |
f52e5902 | 338 | int event_notifier_group_objd, ret, fd_flag; |
d8d2416d FD |
339 | |
340 | event_notifier_group = lttng_event_notifier_group_create(); | |
341 | if (!event_notifier_group) | |
342 | return -ENOMEM; | |
343 | ||
344 | /* | |
345 | * Set this file descriptor as NON-BLOCKING. | |
346 | */ | |
f52e5902 | 347 | fd_flag = fcntl(*event_notifier_notif_fd, F_GETFL); |
d8d2416d FD |
348 | |
349 | fd_flag |= O_NONBLOCK; | |
350 | ||
f52e5902 | 351 | ret = fcntl(*event_notifier_notif_fd, F_SETFL, fd_flag); |
d8d2416d FD |
352 | if (ret) { |
353 | ret = -errno; | |
354 | goto fd_error; | |
355 | } | |
356 | ||
357 | event_notifier_group_objd = objd_alloc(event_notifier_group, | |
358 | <tng_event_notifier_group_ops, owner, "event_notifier_group"); | |
359 | if (event_notifier_group_objd < 0) { | |
360 | ret = event_notifier_group_objd; | |
361 | goto objd_error; | |
362 | } | |
363 | ||
364 | event_notifier_group->objd = event_notifier_group_objd; | |
365 | event_notifier_group->owner = owner; | |
f52e5902 MD |
366 | event_notifier_group->notification_fd = *event_notifier_notif_fd; |
367 | /* Object descriptor takes ownership of notification fd. */ | |
368 | *event_notifier_notif_fd = -1; | |
d8d2416d FD |
369 | |
370 | return event_notifier_group_objd; | |
371 | ||
372 | objd_error: | |
373 | lttng_event_notifier_group_destroy(event_notifier_group); | |
374 | fd_error: | |
d8d2416d FD |
375 | return ret; |
376 | } | |
377 | ||
f4681817 MD |
378 | static |
379 | long lttng_abi_add_context(int objd, | |
fd17d7ce MD |
380 | struct lttng_ust_abi_context *context_param, |
381 | union lttng_ust_abi_args *uargs, | |
f69fe5fb | 382 | struct lttng_ust_ctx **ctx, struct lttng_ust_session *session) |
f4681817 | 383 | { |
8e696cfa | 384 | return lttng_attach_context(context_param, uargs, ctx, session); |
f4681817 MD |
385 | } |
386 | ||
387 | /** | |
388 | * lttng_cmd - lttng control through socket commands | |
389 | * | |
390 | * @objd: the object descriptor | |
391 | * @cmd: the command | |
392 | * @arg: command arg | |
ef9ff354 | 393 | * @uargs: UST arguments (internal) |
f59ed768 | 394 | * @owner: objd owner |
f4681817 MD |
395 | * |
396 | * This descriptor implements lttng commands: | |
fd17d7ce | 397 | * LTTNG_UST_ABI_SESSION |
f4681817 | 398 | * Returns a LTTng trace session object descriptor |
fd17d7ce | 399 | * LTTNG_UST_ABI_TRACER_VERSION |
f4681817 | 400 | * Returns the LTTng kernel tracer version |
fd17d7ce | 401 | * LTTNG_UST_ABI_TRACEPOINT_LIST |
f4681817 | 402 | * Returns a file descriptor listing available tracepoints |
fd17d7ce | 403 | * LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST |
06d4f27e | 404 | * Returns a file descriptor listing available tracepoint fields |
fd17d7ce | 405 | * LTTNG_UST_ABI_WAIT_QUIESCENT |
f4681817 MD |
406 | * Returns after all previously running probes have completed |
407 | * | |
408 | * The returned session will be deleted when its file descriptor is closed. | |
409 | */ | |
410 | static | |
ef9ff354 | 411 | long lttng_cmd(int objd, unsigned int cmd, unsigned long arg, |
fd17d7ce | 412 | union lttng_ust_abi_args *uargs, void *owner) |
f4681817 MD |
413 | { |
414 | switch (cmd) { | |
fd17d7ce | 415 | case LTTNG_UST_ABI_SESSION: |
f59ed768 | 416 | return lttng_abi_create_session(owner); |
fd17d7ce | 417 | case LTTNG_UST_ABI_TRACER_VERSION: |
f4681817 | 418 | return lttng_abi_tracer_version(objd, |
fd17d7ce MD |
419 | (struct lttng_ust_abi_tracer_version *) arg); |
420 | case LTTNG_UST_ABI_TRACEPOINT_LIST: | |
f59ed768 | 421 | return lttng_abi_tracepoint_list(owner); |
fd17d7ce | 422 | case LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST: |
f59ed768 | 423 | return lttng_abi_tracepoint_field_list(owner); |
fd17d7ce | 424 | case LTTNG_UST_ABI_WAIT_QUIESCENT: |
b653ddc1 | 425 | lttng_ust_urcu_synchronize_rcu(); |
f4681817 | 426 | return 0; |
fd17d7ce | 427 | case LTTNG_UST_ABI_EVENT_NOTIFIER_GROUP_CREATE: |
d8d2416d | 428 | return lttng_abi_event_notifier_send_fd(owner, |
f52e5902 | 429 | &uargs->event_notifier_handle.event_notifier_notif_fd); |
f4681817 MD |
430 | default: |
431 | return -EINVAL; | |
432 | } | |
433 | } | |
434 | ||
fd17d7ce | 435 | static const struct lttng_ust_abi_objd_ops lttng_ops = { |
f4681817 MD |
436 | .cmd = lttng_cmd, |
437 | }; | |
438 | ||
04a351cb | 439 | static |
74d81a6c | 440 | int lttng_abi_map_channel(int session_objd, |
fd17d7ce MD |
441 | struct lttng_ust_abi_channel *ust_chan, |
442 | union lttng_ust_abi_args *uargs, | |
74d81a6c | 443 | void *owner) |
f4681817 | 444 | { |
f69fe5fb | 445 | struct lttng_ust_session *session = objd_private(session_objd); |
f4681817 | 446 | const char *transport_name; |
a084756d | 447 | struct lttng_transport *transport; |
74d81a6c | 448 | const char *chan_name; |
f4681817 | 449 | int chan_objd; |
74d81a6c | 450 | struct lttng_ust_shm_handle *channel_handle; |
f0fde1c3 | 451 | struct lttng_ust_abi_channel_config *lttng_chan_config; |
74d81a6c | 452 | struct lttng_channel *lttng_chan; |
5198080d | 453 | struct lttng_ust_lib_ring_buffer_channel *chan; |
74d81a6c MD |
454 | struct lttng_ust_lib_ring_buffer_config *config; |
455 | void *chan_data; | |
ff0f5728 | 456 | int wakeup_fd; |
74d81a6c MD |
457 | uint64_t len; |
458 | int ret; | |
fd17d7ce | 459 | enum lttng_ust_abi_chan_type type; |
74d81a6c MD |
460 | |
461 | chan_data = uargs->channel.chan_data; | |
ff0f5728 | 462 | wakeup_fd = uargs->channel.wakeup_fd; |
74d81a6c MD |
463 | len = ust_chan->len; |
464 | type = ust_chan->type; | |
465 | ||
466 | switch (type) { | |
fd17d7ce | 467 | case LTTNG_UST_ABI_CHAN_PER_CPU: |
74d81a6c MD |
468 | break; |
469 | default: | |
ff0f5728 MD |
470 | ret = -EINVAL; |
471 | goto invalid; | |
74d81a6c MD |
472 | } |
473 | ||
bdb12629 | 474 | if (session->priv->been_active) { |
74d81a6c MD |
475 | ret = -EBUSY; |
476 | goto active; /* Refuse to add channel to active session */ | |
477 | } | |
f4681817 | 478 | |
f0fde1c3 MD |
479 | lttng_chan = zmalloc(sizeof(struct lttng_channel)); |
480 | if (!lttng_chan) { | |
481 | ret = -ENOMEM; | |
482 | goto lttng_chan_error; | |
483 | } | |
484 | ||
ff0f5728 | 485 | channel_handle = channel_handle_create(chan_data, len, wakeup_fd); |
74d81a6c MD |
486 | if (!channel_handle) { |
487 | ret = -EINVAL; | |
488 | goto handle_error; | |
489 | } | |
490 | ||
867942fd MD |
491 | /* Ownership of chan_data and wakeup_fd taken by channel handle. */ |
492 | uargs->channel.chan_data = NULL; | |
493 | uargs->channel.wakeup_fd = -1; | |
494 | ||
74d81a6c MD |
495 | chan = shmp(channel_handle, channel_handle->chan); |
496 | assert(chan); | |
03d2d293 | 497 | chan->handle = channel_handle; |
74d81a6c | 498 | config = &chan->backend.config; |
f0fde1c3 MD |
499 | lttng_chan_config = channel_get_private_config(chan); |
500 | if (!lttng_chan_config) { | |
74d81a6c MD |
501 | ret = -EINVAL; |
502 | goto alloc_error; | |
503 | } | |
504 | ||
505 | /* Lookup transport name */ | |
506 | switch (type) { | |
fd17d7ce | 507 | case LTTNG_UST_ABI_CHAN_PER_CPU: |
74d81a6c | 508 | if (config->output == RING_BUFFER_MMAP) { |
34a91bdb MD |
509 | if (config->mode == RING_BUFFER_OVERWRITE) { |
510 | if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) { | |
511 | transport_name = "relay-overwrite-mmap"; | |
512 | } else { | |
513 | transport_name = "relay-overwrite-rt-mmap"; | |
514 | } | |
515 | } else { | |
516 | if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) { | |
517 | transport_name = "relay-discard-mmap"; | |
518 | } else { | |
519 | transport_name = "relay-discard-rt-mmap"; | |
520 | } | |
521 | } | |
f4681817 | 522 | } else { |
74d81a6c MD |
523 | ret = -EINVAL; |
524 | goto notransport; | |
f4681817 | 525 | } |
74d81a6c | 526 | chan_name = "channel"; |
f4681817 | 527 | break; |
f4681817 | 528 | default: |
74d81a6c MD |
529 | ret = -EINVAL; |
530 | goto notransport; | |
fe38d4af | 531 | } |
65c48d6a | 532 | transport = lttng_ust_transport_find(transport_name); |
74d81a6c MD |
533 | if (!transport) { |
534 | DBG("LTTng transport %s not found\n", | |
535 | transport_name); | |
536 | ret = -EINVAL; | |
537 | goto notransport; | |
538 | } | |
539 | ||
540 | chan_objd = objd_alloc(NULL, <tng_channel_ops, owner, chan_name); | |
fe38d4af MD |
541 | if (chan_objd < 0) { |
542 | ret = chan_objd; | |
543 | goto objd_error; | |
f4681817 | 544 | } |
74d81a6c MD |
545 | |
546 | /* Initialize our lttng chan */ | |
547 | lttng_chan->chan = chan; | |
ac6b4ac6 | 548 | lttng_chan->tstate = 1; |
74d81a6c MD |
549 | lttng_chan->enabled = 1; |
550 | lttng_chan->ctx = NULL; | |
551 | lttng_chan->session = session; | |
74d81a6c MD |
552 | lttng_chan->ops = &transport->ops; |
553 | memcpy(<tng_chan->chan->backend.config, | |
554 | transport->client_config, | |
555 | sizeof(lttng_chan->chan->backend.config)); | |
bdb12629 | 556 | cds_list_add(<tng_chan->node, &session->priv->chan_head); |
74d81a6c MD |
557 | lttng_chan->header_type = 0; |
558 | lttng_chan->handle = channel_handle; | |
74d81a6c | 559 | lttng_chan->type = type; |
f0fde1c3 MD |
560 | /* Copy fields from lttng ust chan config. */ |
561 | lttng_chan->id = lttng_chan_config->id; | |
562 | memcpy(lttng_chan->uuid, lttng_chan_config->uuid, LTTNG_UST_UUID_LEN); | |
563 | channel_set_private(chan, lttng_chan); | |
74d81a6c | 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); | |
f0fde1c3 | 580 | free(lttng_chan); |
ff0f5728 MD |
581 | return ret; |
582 | ||
74d81a6c | 583 | handle_error: |
f0fde1c3 MD |
584 | free(lttng_chan); |
585 | lttng_chan_error: | |
74d81a6c | 586 | active: |
ff0f5728 | 587 | invalid: |
f4681817 MD |
588 | return ret; |
589 | } | |
590 | ||
591 | /** | |
592 | * lttng_session_cmd - lttng session object command | |
593 | * | |
594 | * @obj: the object | |
595 | * @cmd: the command | |
596 | * @arg: command arg | |
ef9ff354 | 597 | * @uargs: UST arguments (internal) |
f59ed768 | 598 | * @owner: objd owner |
f4681817 MD |
599 | * |
600 | * This descriptor implements lttng commands: | |
fd17d7ce | 601 | * LTTNG_UST_ABI_CHANNEL |
f4681817 | 602 | * Returns a LTTng channel object descriptor |
fd17d7ce | 603 | * LTTNG_UST_ABI_ENABLE |
f4681817 | 604 | * Enables tracing for a session (weak enable) |
fd17d7ce | 605 | * LTTNG_UST_ABI_DISABLE |
f4681817 | 606 | * Disables tracing for a session (strong disable) |
f4681817 MD |
607 | * |
608 | * The returned channel will be deleted when its file descriptor is closed. | |
609 | */ | |
610 | static | |
ef9ff354 | 611 | long lttng_session_cmd(int objd, unsigned int cmd, unsigned long arg, |
fd17d7ce | 612 | union lttng_ust_abi_args *uargs, void *owner) |
f4681817 | 613 | { |
f69fe5fb | 614 | struct lttng_ust_session *session = objd_private(objd); |
f4681817 MD |
615 | |
616 | switch (cmd) { | |
fd17d7ce | 617 | case LTTNG_UST_ABI_CHANNEL: |
74d81a6c | 618 | return lttng_abi_map_channel(objd, |
fd17d7ce | 619 | (struct lttng_ust_abi_channel *) arg, |
74d81a6c | 620 | uargs, owner); |
fd17d7ce MD |
621 | case LTTNG_UST_ABI_SESSION_START: |
622 | case LTTNG_UST_ABI_ENABLE: | |
7dd08bec | 623 | return lttng_session_enable(session); |
fd17d7ce MD |
624 | case LTTNG_UST_ABI_SESSION_STOP: |
625 | case LTTNG_UST_ABI_DISABLE: | |
7dd08bec | 626 | return lttng_session_disable(session); |
fd17d7ce | 627 | case LTTNG_UST_ABI_SESSION_STATEDUMP: |
710b8ee3 | 628 | return lttng_session_statedump(session); |
fd17d7ce MD |
629 | case LTTNG_UST_ABI_COUNTER: |
630 | case LTTNG_UST_ABI_COUNTER_GLOBAL: | |
631 | case LTTNG_UST_ABI_COUNTER_CPU: | |
ebabbf58 MD |
632 | /* Not implemented yet. */ |
633 | return -EINVAL; | |
f4681817 MD |
634 | default: |
635 | return -EINVAL; | |
636 | } | |
637 | } | |
638 | ||
639 | /* | |
640 | * Called when the last file reference is dropped. | |
641 | * | |
642 | * Big fat note: channels and events are invariant for the whole session after | |
643 | * their creation. So this session destruction also destroys all channel and | |
644 | * event structures specific to this session (they are not destroyed when their | |
645 | * individual file is released). | |
646 | */ | |
647 | static | |
1ea11eab | 648 | int lttng_release_session(int objd) |
f4681817 | 649 | { |
f69fe5fb | 650 | struct lttng_ust_session *session = objd_private(objd); |
f4681817 | 651 | |
1ea11eab | 652 | if (session) { |
7dd08bec | 653 | lttng_session_destroy(session); |
1ea11eab MD |
654 | return 0; |
655 | } else { | |
656 | return -EINVAL; | |
657 | } | |
f4681817 MD |
658 | } |
659 | ||
fd17d7ce | 660 | static const struct lttng_ust_abi_objd_ops lttng_session_ops = { |
1ea11eab | 661 | .release = lttng_release_session, |
f4681817 MD |
662 | .cmd = lttng_session_cmd, |
663 | }; | |
664 | ||
d8d2416d | 665 | static int lttng_ust_event_notifier_enabler_create(int event_notifier_group_obj, |
fd17d7ce | 666 | void *owner, struct lttng_ust_abi_event_notifier *event_notifier_param, |
d8d2416d FD |
667 | enum lttng_enabler_format_type type) |
668 | { | |
669 | struct lttng_event_notifier_group *event_notifier_group = | |
670 | objd_private(event_notifier_group_obj); | |
671 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
672 | int event_notifier_objd, ret; | |
673 | ||
fd17d7ce | 674 | event_notifier_param->event.name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; |
d8d2416d FD |
675 | event_notifier_objd = objd_alloc(NULL, <tng_event_notifier_enabler_ops, owner, |
676 | "event_notifier enabler"); | |
677 | if (event_notifier_objd < 0) { | |
678 | ret = event_notifier_objd; | |
679 | goto objd_error; | |
680 | } | |
681 | ||
682 | event_notifier_enabler = lttng_event_notifier_enabler_create( | |
683 | event_notifier_group, type, event_notifier_param); | |
684 | if (!event_notifier_enabler) { | |
685 | ret = -ENOMEM; | |
686 | goto event_notifier_error; | |
687 | } | |
688 | ||
689 | objd_set_private(event_notifier_objd, event_notifier_enabler); | |
690 | /* The event_notifier holds a reference on the event_notifier group. */ | |
691 | objd_ref(event_notifier_enabler->group->objd); | |
692 | ||
693 | return event_notifier_objd; | |
694 | ||
695 | event_notifier_error: | |
696 | { | |
697 | int err; | |
698 | ||
fd17d7ce | 699 | err = lttng_ust_abi_objd_unref(event_notifier_objd, 1); |
d8d2416d FD |
700 | assert(!err); |
701 | } | |
702 | objd_error: | |
703 | return ret; | |
704 | } | |
705 | ||
706 | static | |
707 | long lttng_event_notifier_enabler_cmd(int objd, unsigned int cmd, unsigned long arg, | |
fd17d7ce | 708 | union lttng_ust_abi_args *uargs, void *owner) |
d8d2416d FD |
709 | { |
710 | struct lttng_event_notifier_enabler *event_notifier_enabler = objd_private(objd); | |
711 | switch (cmd) { | |
fd17d7ce | 712 | case LTTNG_UST_ABI_FILTER: |
a56fd376 FD |
713 | return lttng_event_notifier_enabler_attach_filter_bytecode( |
714 | event_notifier_enabler, | |
ab89263e | 715 | (struct lttng_ust_bytecode_node **) arg); |
fd17d7ce | 716 | case LTTNG_UST_ABI_EXCLUSION: |
d8d2416d | 717 | return lttng_event_notifier_enabler_attach_exclusion(event_notifier_enabler, |
e9fe6aad | 718 | (struct lttng_ust_excluder_node **) arg); |
fd17d7ce | 719 | case LTTNG_UST_ABI_CAPTURE: |
d37ecb3f FD |
720 | return lttng_event_notifier_enabler_attach_capture_bytecode( |
721 | event_notifier_enabler, | |
49cde654 | 722 | (struct lttng_ust_bytecode_node **) arg); |
fd17d7ce | 723 | case LTTNG_UST_ABI_ENABLE: |
d8d2416d | 724 | return lttng_event_notifier_enabler_enable(event_notifier_enabler); |
fd17d7ce | 725 | case LTTNG_UST_ABI_DISABLE: |
d8d2416d FD |
726 | return lttng_event_notifier_enabler_disable(event_notifier_enabler); |
727 | default: | |
728 | return -EINVAL; | |
729 | } | |
730 | } | |
731 | ||
ebabbf58 MD |
732 | /** |
733 | * lttng_event_notifier_group_error_counter_cmd - lttng event_notifier group error counter object command | |
734 | * | |
735 | * @obj: the object | |
736 | * @cmd: the command | |
737 | * @arg: command arg | |
738 | * @uargs: UST arguments (internal) | |
739 | * @owner: objd owner | |
740 | * | |
741 | * This descriptor implements lttng commands: | |
fd17d7ce | 742 | * LTTNG_UST_ABI_COUNTER_GLOBAL |
ebabbf58 | 743 | * Return negative error code on error, 0 on success. |
fd17d7ce | 744 | * LTTNG_UST_ABI_COUNTER_CPU |
ebabbf58 MD |
745 | * Return negative error code on error, 0 on success. |
746 | */ | |
747 | static | |
748 | long lttng_event_notifier_group_error_counter_cmd(int objd, unsigned int cmd, unsigned long arg, | |
fd17d7ce | 749 | union lttng_ust_abi_args *uargs, void *owner) |
ebabbf58 | 750 | { |
ba5b3d2b | 751 | int ret; |
ebabbf58 MD |
752 | struct lttng_counter *counter = objd_private(objd); |
753 | ||
754 | switch (cmd) { | |
fd17d7ce | 755 | case LTTNG_UST_ABI_COUNTER_GLOBAL: |
ba5b3d2b JR |
756 | ret = -EINVAL; /* Unimplemented. */ |
757 | break; | |
fd17d7ce | 758 | case LTTNG_UST_ABI_COUNTER_CPU: |
ebabbf58 | 759 | { |
fd17d7ce MD |
760 | struct lttng_ust_abi_counter_cpu *counter_cpu = |
761 | (struct lttng_ust_abi_counter_cpu *)arg; | |
ba5b3d2b JR |
762 | |
763 | ret = lttng_counter_set_cpu_shm(counter->counter, | |
ebabbf58 | 764 | counter_cpu->cpu_nr, uargs->counter_shm.shm_fd); |
ba5b3d2b JR |
765 | if (!ret) { |
766 | /* Take ownership of the shm_fd. */ | |
767 | uargs->counter_shm.shm_fd = -1; | |
768 | } | |
769 | break; | |
ebabbf58 MD |
770 | } |
771 | default: | |
ba5b3d2b JR |
772 | ret = -EINVAL; |
773 | break; | |
ebabbf58 | 774 | } |
ba5b3d2b JR |
775 | |
776 | return ret; | |
ebabbf58 MD |
777 | } |
778 | ||
ddabe860 | 779 | __attribute__((visibility("hidden"))) |
ebabbf58 MD |
780 | int lttng_release_event_notifier_group_error_counter(int objd) |
781 | { | |
782 | struct lttng_counter *counter = objd_private(objd); | |
783 | ||
784 | if (counter) { | |
fd17d7ce | 785 | return lttng_ust_abi_objd_unref(counter->event_notifier_group->objd, 0); |
ebabbf58 MD |
786 | } else { |
787 | return -EINVAL; | |
788 | } | |
789 | } | |
790 | ||
fd17d7ce | 791 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_error_counter_ops = { |
ebabbf58 MD |
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, | |
fd17d7ce | 798 | struct lttng_ust_abi_counter_conf *error_counter_conf) |
ebabbf58 MD |
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 | ||
fd17d7ce | 811 | if (error_counter_conf->arithmetic != LTTNG_UST_ABI_COUNTER_ARITHMETIC_MODULAR) |
ebabbf58 MD |
812 | return -EINVAL; |
813 | ||
814 | if (error_counter_conf->number_dimensions != 1) | |
815 | return -EINVAL; | |
816 | ||
817 | switch (error_counter_conf->bitness) { | |
fd17d7ce | 818 | case LTTNG_UST_ABI_COUNTER_BITNESS_64: |
ebabbf58 MD |
819 | counter_transport_name = "counter-per-cpu-64-modular"; |
820 | break; | |
fd17d7ce | 821 | case LTTNG_UST_ABI_COUNTER_BITNESS_32: |
ebabbf58 MD |
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 | ||
ebabbf58 | 848 | event_notifier_group->error_counter_len = counter_len; |
33f43caa MD |
849 | /* |
850 | * store-release to publish error counter matches load-acquire | |
851 | * in record_error. Ensures the counter is created and the | |
852 | * error_counter_len is set before they are used. | |
853 | * Currently a full memory barrier is used, which could be | |
854 | * turned into acquire-release barriers. | |
855 | */ | |
856 | cmm_smp_mb(); | |
857 | CMM_STORE_SHARED(event_notifier_group->error_counter, counter); | |
ebabbf58 MD |
858 | |
859 | counter->objd = counter_objd; | |
860 | counter->event_notifier_group = event_notifier_group; /* owner */ | |
861 | ||
862 | objd_set_private(counter_objd, counter); | |
863 | /* The error counter holds a reference on the event_notifier group. */ | |
864 | objd_ref(event_notifier_group->objd); | |
865 | ||
866 | return counter_objd; | |
867 | ||
868 | create_error: | |
869 | { | |
870 | int err; | |
871 | ||
fd17d7ce | 872 | err = lttng_ust_abi_objd_unref(counter_objd, 1); |
ebabbf58 MD |
873 | assert(!err); |
874 | } | |
875 | objd_error: | |
876 | return ret; | |
877 | } | |
878 | ||
d8d2416d FD |
879 | static |
880 | long lttng_event_notifier_group_cmd(int objd, unsigned int cmd, unsigned long arg, | |
fd17d7ce | 881 | union lttng_ust_abi_args *uargs, void *owner) |
d8d2416d FD |
882 | { |
883 | switch (cmd) { | |
fd17d7ce | 884 | case LTTNG_UST_ABI_EVENT_NOTIFIER_CREATE: |
d8d2416d | 885 | { |
fd17d7ce MD |
886 | struct lttng_ust_abi_event_notifier *event_notifier_param = |
887 | (struct lttng_ust_abi_event_notifier *) arg; | |
d8d2416d FD |
888 | if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) { |
889 | /* | |
890 | * If the event name is a star globbing pattern, | |
891 | * we create the special star globbing enabler. | |
892 | */ | |
893 | return lttng_ust_event_notifier_enabler_create(objd, | |
894 | owner, event_notifier_param, | |
895 | LTTNG_ENABLER_FORMAT_STAR_GLOB); | |
896 | } else { | |
897 | return lttng_ust_event_notifier_enabler_create(objd, | |
898 | owner, event_notifier_param, | |
899 | LTTNG_ENABLER_FORMAT_EVENT); | |
900 | } | |
901 | } | |
fd17d7ce | 902 | case LTTNG_UST_ABI_COUNTER: |
ebabbf58 | 903 | { |
fd17d7ce MD |
904 | struct lttng_ust_abi_counter_conf *counter_conf = |
905 | (struct lttng_ust_abi_counter_conf *) uargs->counter.counter_data; | |
ebabbf58 MD |
906 | return lttng_ust_event_notifier_group_create_error_counter( |
907 | objd, owner, counter_conf); | |
908 | } | |
d8d2416d FD |
909 | default: |
910 | return -EINVAL; | |
911 | } | |
912 | } | |
913 | ||
914 | static | |
915 | int lttng_event_notifier_enabler_release(int objd) | |
916 | { | |
917 | struct lttng_event_notifier_enabler *event_notifier_enabler = objd_private(objd); | |
918 | ||
919 | if (event_notifier_enabler) | |
fd17d7ce | 920 | return lttng_ust_abi_objd_unref(event_notifier_enabler->group->objd, 0); |
d8d2416d FD |
921 | return 0; |
922 | } | |
923 | ||
fd17d7ce | 924 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_enabler_ops = { |
d8d2416d FD |
925 | .release = lttng_event_notifier_enabler_release, |
926 | .cmd = lttng_event_notifier_enabler_cmd, | |
927 | }; | |
928 | ||
929 | static | |
930 | int lttng_release_event_notifier_group(int objd) | |
931 | { | |
932 | struct lttng_event_notifier_group *event_notifier_group = objd_private(objd); | |
933 | ||
934 | if (event_notifier_group) { | |
935 | lttng_event_notifier_group_destroy(event_notifier_group); | |
936 | return 0; | |
937 | } else { | |
938 | return -EINVAL; | |
939 | } | |
940 | } | |
941 | ||
fd17d7ce | 942 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_ops = { |
d8d2416d FD |
943 | .release = lttng_release_event_notifier_group, |
944 | .cmd = lttng_event_notifier_group_cmd, | |
945 | }; | |
946 | ||
51489cad | 947 | static |
ef9ff354 | 948 | long lttng_tracepoint_list_cmd(int objd, unsigned int cmd, unsigned long arg, |
fd17d7ce | 949 | union lttng_ust_abi_args *uargs, void *owner) |
51489cad | 950 | { |
c8fcf224 | 951 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
fd17d7ce MD |
952 | struct lttng_ust_abi_tracepoint_iter *tp = |
953 | (struct lttng_ust_abi_tracepoint_iter *) arg; | |
954 | struct lttng_ust_abi_tracepoint_iter *iter; | |
51489cad MD |
955 | |
956 | switch (cmd) { | |
fd17d7ce | 957 | case LTTNG_UST_ABI_TRACEPOINT_LIST_GET: |
c8fcf224 | 958 | { |
c8fcf224 MD |
959 | iter = lttng_ust_tracepoint_list_get_iter_next(list); |
960 | if (!iter) | |
7bc53e94 | 961 | return -LTTNG_UST_ERR_NOENT; |
c8fcf224 | 962 | memcpy(tp, iter, sizeof(*tp)); |
51489cad | 963 | return 0; |
c8fcf224 | 964 | } |
51489cad MD |
965 | default: |
966 | return -EINVAL; | |
967 | } | |
968 | } | |
969 | ||
970 | static | |
f59ed768 | 971 | int lttng_abi_tracepoint_list(void *owner) |
51489cad MD |
972 | { |
973 | int list_objd, ret; | |
c8fcf224 | 974 | struct lttng_ust_tracepoint_list *list; |
51489cad | 975 | |
7047f3da | 976 | list_objd = objd_alloc(NULL, <tng_tracepoint_list_ops, owner, "tp_list"); |
51489cad MD |
977 | if (list_objd < 0) { |
978 | ret = list_objd; | |
979 | goto objd_error; | |
980 | } | |
981 | list = zmalloc(sizeof(*list)); | |
982 | if (!list) { | |
983 | ret = -ENOMEM; | |
984 | goto alloc_error; | |
985 | } | |
986 | objd_set_private(list_objd, list); | |
987 | ||
c8fcf224 | 988 | /* populate list by walking on all registered probes. */ |
7dd08bec | 989 | ret = lttng_probes_get_event_list(list); |
c8fcf224 MD |
990 | if (ret) { |
991 | goto list_error; | |
992 | } | |
51489cad MD |
993 | return list_objd; |
994 | ||
c8fcf224 MD |
995 | list_error: |
996 | free(list); | |
51489cad MD |
997 | alloc_error: |
998 | { | |
999 | int err; | |
1000 | ||
fd17d7ce | 1001 | err = lttng_ust_abi_objd_unref(list_objd, 1); |
51489cad MD |
1002 | assert(!err); |
1003 | } | |
1004 | objd_error: | |
1005 | return ret; | |
1006 | } | |
1007 | ||
1008 | static | |
1009 | int lttng_release_tracepoint_list(int objd) | |
1010 | { | |
c8fcf224 | 1011 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
51489cad MD |
1012 | |
1013 | if (list) { | |
7dd08bec | 1014 | lttng_probes_prune_event_list(list); |
51489cad MD |
1015 | free(list); |
1016 | return 0; | |
1017 | } else { | |
1018 | return -EINVAL; | |
1019 | } | |
1020 | } | |
1021 | ||
fd17d7ce | 1022 | static const struct lttng_ust_abi_objd_ops lttng_tracepoint_list_ops = { |
51489cad MD |
1023 | .release = lttng_release_tracepoint_list, |
1024 | .cmd = lttng_tracepoint_list_cmd, | |
1025 | }; | |
1026 | ||
06d4f27e MD |
1027 | static |
1028 | long lttng_tracepoint_field_list_cmd(int objd, unsigned int cmd, | |
fd17d7ce | 1029 | unsigned long arg, union lttng_ust_abi_args *uargs, void *owner) |
06d4f27e MD |
1030 | { |
1031 | struct lttng_ust_field_list *list = objd_private(objd); | |
fd17d7ce MD |
1032 | struct lttng_ust_abi_field_iter *tp = &uargs->field_list.entry; |
1033 | struct lttng_ust_abi_field_iter *iter; | |
06d4f27e MD |
1034 | |
1035 | switch (cmd) { | |
fd17d7ce | 1036 | case LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST_GET: |
06d4f27e | 1037 | { |
06d4f27e MD |
1038 | iter = lttng_ust_field_list_get_iter_next(list); |
1039 | if (!iter) | |
7bc53e94 | 1040 | return -LTTNG_UST_ERR_NOENT; |
06d4f27e MD |
1041 | memcpy(tp, iter, sizeof(*tp)); |
1042 | return 0; | |
1043 | } | |
1044 | default: | |
1045 | return -EINVAL; | |
1046 | } | |
1047 | } | |
1048 | ||
1049 | static | |
f59ed768 | 1050 | int lttng_abi_tracepoint_field_list(void *owner) |
06d4f27e MD |
1051 | { |
1052 | int list_objd, ret; | |
1053 | struct lttng_ust_field_list *list; | |
1054 | ||
7047f3da MD |
1055 | list_objd = objd_alloc(NULL, <tng_tracepoint_field_list_ops, owner, |
1056 | "tp_field_list"); | |
06d4f27e MD |
1057 | if (list_objd < 0) { |
1058 | ret = list_objd; | |
1059 | goto objd_error; | |
1060 | } | |
1061 | list = zmalloc(sizeof(*list)); | |
1062 | if (!list) { | |
1063 | ret = -ENOMEM; | |
1064 | goto alloc_error; | |
1065 | } | |
1066 | objd_set_private(list_objd, list); | |
1067 | ||
1068 | /* populate list by walking on all registered probes. */ | |
7dd08bec | 1069 | ret = lttng_probes_get_field_list(list); |
06d4f27e MD |
1070 | if (ret) { |
1071 | goto list_error; | |
1072 | } | |
1073 | return list_objd; | |
1074 | ||
1075 | list_error: | |
1076 | free(list); | |
1077 | alloc_error: | |
1078 | { | |
1079 | int err; | |
1080 | ||
fd17d7ce | 1081 | err = lttng_ust_abi_objd_unref(list_objd, 1); |
06d4f27e MD |
1082 | assert(!err); |
1083 | } | |
1084 | objd_error: | |
1085 | return ret; | |
1086 | } | |
1087 | ||
1088 | static | |
1089 | int lttng_release_tracepoint_field_list(int objd) | |
1090 | { | |
1091 | struct lttng_ust_field_list *list = objd_private(objd); | |
1092 | ||
1093 | if (list) { | |
7dd08bec | 1094 | lttng_probes_prune_field_list(list); |
06d4f27e MD |
1095 | free(list); |
1096 | return 0; | |
1097 | } else { | |
1098 | return -EINVAL; | |
1099 | } | |
1100 | } | |
1101 | ||
fd17d7ce | 1102 | static const struct lttng_ust_abi_objd_ops lttng_tracepoint_field_list_ops = { |
06d4f27e MD |
1103 | .release = lttng_release_tracepoint_field_list, |
1104 | .cmd = lttng_tracepoint_field_list_cmd, | |
1105 | }; | |
1106 | ||
f4681817 | 1107 | static |
fd17d7ce MD |
1108 | int lttng_abi_map_stream(int channel_objd, struct lttng_ust_abi_stream *info, |
1109 | union lttng_ust_abi_args *uargs, void *owner) | |
f4681817 | 1110 | { |
7dd08bec | 1111 | struct lttng_channel *channel = objd_private(channel_objd); |
74d81a6c | 1112 | int ret; |
f4681817 | 1113 | |
74d81a6c MD |
1114 | ret = channel_handle_add_stream(channel->handle, |
1115 | uargs->stream.shm_fd, uargs->stream.wakeup_fd, | |
1116 | info->stream_nr, info->len); | |
1117 | if (ret) | |
1118 | goto error_add_stream; | |
118c051e MD |
1119 | /* Take ownership of shm_fd and wakeup_fd. */ |
1120 | uargs->stream.shm_fd = -1; | |
1121 | uargs->stream.wakeup_fd = -1; | |
74d81a6c MD |
1122 | |
1123 | return 0; | |
1124 | ||
1125 | error_add_stream: | |
f4681817 MD |
1126 | return ret; |
1127 | } | |
f4681817 MD |
1128 | |
1129 | static | |
d871c65b | 1130 | int lttng_abi_create_event_enabler(int channel_objd, |
fd17d7ce | 1131 | struct lttng_ust_abi_event *event_param, |
e58095ef | 1132 | void *owner, |
e450e339 | 1133 | enum lttng_enabler_format_type format_type) |
f4681817 | 1134 | { |
7dd08bec | 1135 | struct lttng_channel *channel = objd_private(channel_objd); |
d871c65b | 1136 | struct lttng_event_enabler *enabler; |
f4681817 MD |
1137 | int event_objd, ret; |
1138 | ||
fd17d7ce | 1139 | event_param->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; |
d871c65b FD |
1140 | event_objd = objd_alloc(NULL, <tng_event_enabler_ops, owner, |
1141 | "event enabler"); | |
f4681817 MD |
1142 | if (event_objd < 0) { |
1143 | ret = event_objd; | |
1144 | goto objd_error; | |
1145 | } | |
1146 | /* | |
1147 | * We tolerate no failure path after event creation. It will stay | |
1148 | * invariant for the rest of the session. | |
1149 | */ | |
d871c65b | 1150 | enabler = lttng_event_enabler_create(format_type, event_param, channel); |
e58095ef MD |
1151 | if (!enabler) { |
1152 | ret = -ENOMEM; | |
f4681817 MD |
1153 | goto event_error; |
1154 | } | |
e58095ef | 1155 | objd_set_private(event_objd, enabler); |
f4681817 MD |
1156 | /* The event holds a reference on the channel */ |
1157 | objd_ref(channel_objd); | |
1158 | return event_objd; | |
1159 | ||
1160 | event_error: | |
1ea11eab MD |
1161 | { |
1162 | int err; | |
1163 | ||
fd17d7ce | 1164 | err = lttng_ust_abi_objd_unref(event_objd, 1); |
1ea11eab MD |
1165 | assert(!err); |
1166 | } | |
f4681817 MD |
1167 | objd_error: |
1168 | return ret; | |
1169 | } | |
1170 | ||
1171 | /** | |
1172 | * lttng_channel_cmd - lttng control through object descriptors | |
1173 | * | |
1174 | * @objd: the object descriptor | |
1175 | * @cmd: the command | |
1176 | * @arg: command arg | |
ef9ff354 | 1177 | * @uargs: UST arguments (internal) |
f59ed768 | 1178 | * @owner: objd owner |
f4681817 MD |
1179 | * |
1180 | * This object descriptor implements lttng commands: | |
fd17d7ce | 1181 | * LTTNG_UST_ABI_STREAM |
f4681817 MD |
1182 | * Returns an event stream object descriptor or failure. |
1183 | * (typically, one event stream records events from one CPU) | |
fd17d7ce | 1184 | * LTTNG_UST_ABI_EVENT |
f4681817 | 1185 | * Returns an event object descriptor or failure. |
fd17d7ce | 1186 | * LTTNG_UST_ABI_CONTEXT |
f4681817 | 1187 | * Prepend a context field to each event in the channel |
fd17d7ce | 1188 | * LTTNG_UST_ABI_ENABLE |
f4681817 | 1189 | * Enable recording for events in this channel (weak enable) |
fd17d7ce | 1190 | * LTTNG_UST_ABI_DISABLE |
f4681817 MD |
1191 | * Disable recording for events in this channel (strong disable) |
1192 | * | |
1193 | * Channel and event file descriptors also hold a reference on the session. | |
1194 | */ | |
1195 | static | |
ef9ff354 | 1196 | long lttng_channel_cmd(int objd, unsigned int cmd, unsigned long arg, |
fd17d7ce | 1197 | union lttng_ust_abi_args *uargs, void *owner) |
f4681817 | 1198 | { |
7dd08bec | 1199 | struct lttng_channel *channel = objd_private(objd); |
f4681817 | 1200 | |
fd17d7ce | 1201 | if (cmd != LTTNG_UST_ABI_STREAM) { |
74d81a6c MD |
1202 | /* |
1203 | * Check if channel received all streams. | |
1204 | */ | |
1205 | if (!lttng_is_channel_ready(channel)) | |
1206 | return -EPERM; | |
1207 | } | |
1208 | ||
f4681817 | 1209 | switch (cmd) { |
fd17d7ce | 1210 | case LTTNG_UST_ABI_STREAM: |
381c0f1e | 1211 | { |
fd17d7ce | 1212 | struct lttng_ust_abi_stream *stream; |
381c0f1e | 1213 | |
fd17d7ce | 1214 | stream = (struct lttng_ust_abi_stream *) arg; |
381c0f1e | 1215 | /* stream used as output */ |
74d81a6c | 1216 | return lttng_abi_map_stream(objd, stream, uargs, owner); |
381c0f1e | 1217 | } |
fd17d7ce | 1218 | case LTTNG_UST_ABI_EVENT: |
1f18504e | 1219 | { |
fd17d7ce MD |
1220 | struct lttng_ust_abi_event *event_param = |
1221 | (struct lttng_ust_abi_event *) arg; | |
196ec2df PP |
1222 | |
1223 | if (strutils_is_star_glob_pattern(event_param->name)) { | |
1224 | /* | |
1225 | * If the event name is a star globbing pattern, | |
1226 | * we create the special star globbing enabler. | |
1227 | */ | |
d871c65b | 1228 | return lttng_abi_create_event_enabler(objd, event_param, |
e450e339 | 1229 | owner, LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f18504e | 1230 | } else { |
d871c65b | 1231 | return lttng_abi_create_event_enabler(objd, event_param, |
e450e339 | 1232 | owner, LTTNG_ENABLER_FORMAT_EVENT); |
1f18504e MD |
1233 | } |
1234 | } | |
fd17d7ce | 1235 | case LTTNG_UST_ABI_CONTEXT: |
f4681817 | 1236 | return lttng_abi_add_context(objd, |
fd17d7ce | 1237 | (struct lttng_ust_abi_context *) arg, uargs, |
f4681817 | 1238 | &channel->ctx, channel->session); |
fd17d7ce | 1239 | case LTTNG_UST_ABI_ENABLE: |
7dd08bec | 1240 | return lttng_channel_enable(channel); |
fd17d7ce | 1241 | case LTTNG_UST_ABI_DISABLE: |
7dd08bec | 1242 | return lttng_channel_disable(channel); |
fd17d7ce | 1243 | case LTTNG_UST_ABI_FLUSH_BUFFER: |
a880bae5 | 1244 | return channel->ops->priv->flush_buffer(channel->chan, channel->handle); |
f4681817 MD |
1245 | default: |
1246 | return -EINVAL; | |
1247 | } | |
1248 | } | |
1249 | ||
f4681817 MD |
1250 | static |
1251 | int lttng_channel_release(int objd) | |
1252 | { | |
7dd08bec | 1253 | struct lttng_channel *channel = objd_private(objd); |
f4681817 MD |
1254 | |
1255 | if (channel) | |
fd17d7ce | 1256 | return lttng_ust_abi_objd_unref(channel->session->priv->objd, 0); |
f4681817 MD |
1257 | return 0; |
1258 | } | |
1259 | ||
fd17d7ce | 1260 | static const struct lttng_ust_abi_objd_ops lttng_channel_ops = { |
f4681817 | 1261 | .release = lttng_channel_release, |
f4681817 MD |
1262 | .cmd = lttng_channel_cmd, |
1263 | }; | |
1264 | ||
f4681817 | 1265 | /** |
e58095ef | 1266 | * lttng_enabler_cmd - lttng control through object descriptors |
e6c12e3d MD |
1267 | * |
1268 | * @objd: the object descriptor | |
1269 | * @cmd: the command | |
1270 | * @arg: command arg | |
ef9ff354 | 1271 | * @uargs: UST arguments (internal) |
f59ed768 | 1272 | * @owner: objd owner |
e6c12e3d MD |
1273 | * |
1274 | * This object descriptor implements lttng commands: | |
fd17d7ce | 1275 | * LTTNG_UST_ABI_CONTEXT |
e6c12e3d | 1276 | * Prepend a context field to each record of events of this |
e58095ef | 1277 | * enabler. |
fd17d7ce | 1278 | * LTTNG_UST_ABI_ENABLE |
e58095ef | 1279 | * Enable recording for this enabler |
fd17d7ce | 1280 | * LTTNG_UST_ABI_DISABLE |
e58095ef | 1281 | * Disable recording for this enabler |
fd17d7ce | 1282 | * LTTNG_UST_ABI_FILTER |
e58095ef | 1283 | * Attach a filter to an enabler. |
fd17d7ce | 1284 | * LTTNG_UST_ABI_EXCLUSION |
0bfb5cbd | 1285 | * Attach exclusions to an enabler. |
e6c12e3d MD |
1286 | */ |
1287 | static | |
d871c65b | 1288 | long lttng_event_enabler_cmd(int objd, unsigned int cmd, unsigned long arg, |
fd17d7ce | 1289 | union lttng_ust_abi_args *uargs, void *owner) |
e6c12e3d | 1290 | { |
d871c65b | 1291 | struct lttng_event_enabler *enabler = objd_private(objd); |
e6c12e3d MD |
1292 | |
1293 | switch (cmd) { | |
fd17d7ce | 1294 | case LTTNG_UST_ABI_CONTEXT: |
d871c65b | 1295 | return lttng_event_enabler_attach_context(enabler, |
fd17d7ce MD |
1296 | (struct lttng_ust_abi_context *) arg); |
1297 | case LTTNG_UST_ABI_ENABLE: | |
d871c65b | 1298 | return lttng_event_enabler_enable(enabler); |
fd17d7ce | 1299 | case LTTNG_UST_ABI_DISABLE: |
d871c65b | 1300 | return lttng_event_enabler_disable(enabler); |
fd17d7ce | 1301 | case LTTNG_UST_ABI_FILTER: |
2d78951a MD |
1302 | { |
1303 | int ret; | |
1304 | ||
a56fd376 | 1305 | ret = lttng_event_enabler_attach_filter_bytecode(enabler, |
ab89263e | 1306 | (struct lttng_ust_bytecode_node **) arg); |
2d78951a MD |
1307 | if (ret) |
1308 | return ret; | |
2d78951a MD |
1309 | return 0; |
1310 | } | |
fd17d7ce | 1311 | case LTTNG_UST_ABI_EXCLUSION: |
0bfb5cbd | 1312 | { |
d871c65b | 1313 | return lttng_event_enabler_attach_exclusion(enabler, |
e9fe6aad | 1314 | (struct lttng_ust_excluder_node **) arg); |
0bfb5cbd | 1315 | } |
e6c12e3d MD |
1316 | default: |
1317 | return -EINVAL; | |
1318 | } | |
1319 | } | |
1320 | ||
1321 | static | |
d871c65b | 1322 | int lttng_event_enabler_release(int objd) |
e6c12e3d | 1323 | { |
d871c65b FD |
1324 | struct lttng_event_enabler *event_enabler = objd_private(objd); |
1325 | ||
1326 | if (event_enabler) | |
fd17d7ce | 1327 | return lttng_ust_abi_objd_unref(event_enabler->chan->objd, 0); |
e6c12e3d | 1328 | |
e6c12e3d MD |
1329 | return 0; |
1330 | } | |
1331 | ||
fd17d7ce | 1332 | static const struct lttng_ust_abi_objd_ops lttng_event_enabler_ops = { |
d871c65b FD |
1333 | .release = lttng_event_enabler_release, |
1334 | .cmd = lttng_event_enabler_cmd, | |
e6c12e3d MD |
1335 | }; |
1336 | ||
b35d179d | 1337 | void lttng_ust_abi_exit(void) |
f4681817 | 1338 | { |
45e9e699 | 1339 | lttng_ust_abi_close_in_progress = 1; |
701a658f | 1340 | ust_lock_nocheck(); |
f4681817 | 1341 | objd_table_destroy(); |
701a658f | 1342 | ust_unlock(); |
45e9e699 | 1343 | lttng_ust_abi_close_in_progress = 0; |
f4681817 | 1344 | } |