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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
00e2e675 DG |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4 | * 2012 - David Goulet <dgoulet@efficios.com> | |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 | 9 | * |
d14d33bf AM |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
3bd1e081 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
18 | */ |
19 | ||
f02e1e8a DG |
20 | #ifndef LIB_CONSUMER_H |
21 | #define LIB_CONSUMER_H | |
3bd1e081 MD |
22 | |
23 | #include <limits.h> | |
24 | #include <poll.h> | |
6df2e2c9 | 25 | #include <unistd.h> |
e4421fec | 26 | |
3bd1e081 | 27 | #include <lttng/lttng.h> |
10a8a223 | 28 | |
b9182dd9 DG |
29 | #include <common/hashtable/hashtable.h> |
30 | #include <common/compat/fcntl.h> | |
00e2e675 | 31 | #include <common/sessiond-comm/sessiond-comm.h> |
3bd1e081 MD |
32 | |
33 | /* | |
34 | * When the receiving thread dies, we need to have a way to make the polling | |
35 | * thread exit eventually. If all FDs hang up (normal case when the | |
32258573 DG |
36 | * lttng-sessiond stops), we can exit cleanly, but if there is a problem and |
37 | * for whatever reason some FDs remain open, the consumer should still exit | |
3bd1e081 MD |
38 | * eventually. |
39 | * | |
40 | * If the timeout is reached, it means that during this period no events | |
41 | * occurred on the FDs so we need to force an exit. This case should not happen | |
42 | * but it is a safety to ensure we won't block the consumer indefinitely. | |
43 | * | |
44 | * The value of 2 seconds is an arbitrary choice. | |
45 | */ | |
46 | #define LTTNG_CONSUMER_POLL_TIMEOUT 2000 | |
47 | ||
48 | /* Commands for consumer */ | |
49 | enum lttng_consumer_command { | |
50 | LTTNG_CONSUMER_ADD_CHANNEL, | |
51 | LTTNG_CONSUMER_ADD_STREAM, | |
52 | /* pause, delete, active depending on fd state */ | |
53 | LTTNG_CONSUMER_UPDATE_STREAM, | |
54 | /* inform the consumer to quit when all fd has hang up */ | |
55 | LTTNG_CONSUMER_STOP, | |
00e2e675 | 56 | LTTNG_CONSUMER_ADD_RELAYD_SOCKET, |
173af62f DG |
57 | /* Inform the consumer to kill a specific relayd connection */ |
58 | LTTNG_CONSUMER_DESTROY_RELAYD, | |
53632229 DG |
59 | /* Return to the sessiond if there is data pending for a session */ |
60 | LTTNG_CONSUMER_DATA_AVAILABLE, | |
3bd1e081 MD |
61 | }; |
62 | ||
63 | /* State of each fd in consumer */ | |
64 | enum lttng_consumer_stream_state { | |
65 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
66 | LTTNG_CONSUMER_PAUSE_STREAM, | |
67 | LTTNG_CONSUMER_DELETE_STREAM, | |
68 | }; | |
69 | ||
3bd1e081 MD |
70 | enum lttng_consumer_type { |
71 | LTTNG_CONSUMER_UNKNOWN = 0, | |
72 | LTTNG_CONSUMER_KERNEL, | |
7753dea8 MD |
73 | LTTNG_CONSUMER64_UST, |
74 | LTTNG_CONSUMER32_UST, | |
3bd1e081 MD |
75 | }; |
76 | ||
77 | struct lttng_consumer_channel { | |
e4421fec | 78 | struct lttng_ht_node_ulong node; |
3bd1e081 MD |
79 | int key; |
80 | uint64_t max_sb_size; /* the subbuffer size for this channel */ | |
81 | int refcount; /* Number of streams referencing this channel */ | |
c30aaa51 MD |
82 | /* |
83 | * The number of streams to receive initially. Used to guarantee that we do | |
84 | * not destroy a channel before receiving all its associated streams. | |
85 | */ | |
86 | unsigned int nb_init_streams; | |
87 | ||
3bd1e081 MD |
88 | /* For UST */ |
89 | int shm_fd; | |
90 | int wait_fd; | |
91 | void *mmap_base; | |
92 | size_t mmap_len; | |
13161846 | 93 | struct lttng_ust_shm_handle *handle; |
b5c5fc29 | 94 | int wait_fd_is_copy; |
5af2f756 | 95 | int cpucount; |
3bd1e081 MD |
96 | }; |
97 | ||
98 | /* Forward declaration for UST. */ | |
13161846 | 99 | struct lttng_ust_lib_ring_buffer; |
3bd1e081 MD |
100 | |
101 | /* | |
102 | * Internal representation of the streams, sessiond_key is used to identify | |
103 | * uniquely a stream. | |
104 | */ | |
105 | struct lttng_consumer_stream { | |
53632229 | 106 | /* HT node used by the data_ht and metadata_ht */ |
e4421fec | 107 | struct lttng_ht_node_ulong node; |
53632229 DG |
108 | /* HT node used in consumer_data.stream_list_ht */ |
109 | struct lttng_ht_node_ulong node_session_id; | |
3bd1e081 MD |
110 | struct lttng_consumer_channel *chan; /* associated channel */ |
111 | /* | |
112 | * key is the key used by the session daemon to refer to the | |
113 | * object in the consumer daemon. | |
114 | */ | |
115 | int key; | |
116 | int shm_fd; | |
117 | int wait_fd; | |
118 | int out_fd; /* output file to write the data */ | |
119 | off_t out_fd_offset; /* write position in the output file descriptor */ | |
120 | char path_name[PATH_MAX]; /* tracefile name */ | |
121 | enum lttng_consumer_stream_state state; | |
122 | size_t shm_len; | |
123 | void *mmap_base; | |
124 | size_t mmap_len; | |
125 | enum lttng_event_output output; /* splice or mmap */ | |
b5c5fc29 MD |
126 | int shm_fd_is_copy; |
127 | int wait_fd_is_copy; | |
3bd1e081 | 128 | /* For UST */ |
13161846 | 129 | struct lttng_ust_lib_ring_buffer *buf; |
3bd1e081 | 130 | int cpu; |
4078b776 | 131 | int data_read; |
d056b477 | 132 | int hangup_flush_done; |
6df2e2c9 MD |
133 | /* UID/GID of the user owning the session to which stream belongs */ |
134 | uid_t uid; | |
135 | gid_t gid; | |
00e2e675 DG |
136 | /* Network sequence number. Indicating on which relayd socket it goes. */ |
137 | int net_seq_idx; | |
138 | /* Identify if the stream is the metadata */ | |
139 | unsigned int metadata_flag; | |
140 | /* Used when the stream is set for network streaming */ | |
141 | uint64_t relayd_stream_id; | |
173af62f DG |
142 | /* Next sequence number to use for trace packet */ |
143 | uint64_t next_net_seq_num; | |
53632229 DG |
144 | /* Lock to use the stream FDs since they are used between threads. */ |
145 | pthread_mutex_t lock; | |
146 | /* Tracing session id */ | |
147 | uint64_t session_id; | |
00e2e675 DG |
148 | }; |
149 | ||
150 | /* | |
151 | * Internal representation of a relayd socket pair. | |
152 | */ | |
153 | struct consumer_relayd_sock_pair { | |
154 | /* Network sequence number. */ | |
155 | int net_seq_idx; | |
156 | /* Number of stream associated with this relayd */ | |
157 | unsigned int refcount; | |
173af62f DG |
158 | |
159 | /* | |
160 | * This flag indicates whether or not we should destroy this object. The | |
161 | * destruction should ONLY occurs when this flag is set and the refcount is | |
162 | * set to zero. | |
163 | */ | |
164 | unsigned int destroy_flag; | |
165 | ||
51d7db73 DG |
166 | /* |
167 | * Mutex protecting the control socket to avoid out of order packets | |
168 | * between threads sending data to the relayd. Since metadata data is sent | |
169 | * over that socket, at least two sendmsg() are needed (header + data) | |
170 | * creating a race for packets to overlap between threads using it. | |
171 | */ | |
00e2e675 | 172 | pthread_mutex_t ctrl_sock_mutex; |
51d7db73 DG |
173 | |
174 | /* Control socket. Command and metadata are passed over it */ | |
00e2e675 | 175 | struct lttcomm_sock control_sock; |
51d7db73 DG |
176 | |
177 | /* | |
178 | * We don't need a mutex at this point since we only splice or write single | |
179 | * large chunk of data with a header appended at the begining. Moreover, | |
180 | * this socket is for now only used in a single thread. | |
181 | */ | |
00e2e675 DG |
182 | struct lttcomm_sock data_sock; |
183 | struct lttng_ht_node_ulong node; | |
3bd1e081 MD |
184 | }; |
185 | ||
186 | /* | |
187 | * UST consumer local data to the program. One or more instance per | |
188 | * process. | |
189 | */ | |
190 | struct lttng_consumer_local_data { | |
4078b776 MD |
191 | /* |
192 | * Function to call when data is available on a buffer. | |
193 | * Returns the number of bytes read, or negative error value. | |
194 | */ | |
195 | ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream, | |
d41f73b7 | 196 | struct lttng_consumer_local_data *ctx); |
3bd1e081 MD |
197 | /* |
198 | * function to call when we receive a new channel, it receives a | |
199 | * newly allocated channel, depending on the return code of this | |
200 | * function, the new channel will be handled by the application | |
201 | * or the library. | |
202 | * | |
203 | * Returns: | |
204 | * > 0 (success, FD is kept by application) | |
205 | * == 0 (success, FD is left to library) | |
206 | * < 0 (error) | |
207 | */ | |
208 | int (*on_recv_channel)(struct lttng_consumer_channel *channel); | |
209 | /* | |
210 | * function to call when we receive a new stream, it receives a | |
211 | * newly allocated stream, depending on the return code of this | |
212 | * function, the new stream will be handled by the application | |
213 | * or the library. | |
214 | * | |
215 | * Returns: | |
216 | * > 0 (success, FD is kept by application) | |
217 | * == 0 (success, FD is left to library) | |
218 | * < 0 (error) | |
219 | */ | |
220 | int (*on_recv_stream)(struct lttng_consumer_stream *stream); | |
221 | /* | |
222 | * function to call when a stream is getting updated by the session | |
223 | * daemon, this function receives the sessiond key and the new | |
224 | * state, depending on the return code of this function the | |
225 | * update of state for the stream is handled by the application | |
226 | * or the library. | |
227 | * | |
228 | * Returns: | |
229 | * > 0 (success, FD is kept by application) | |
230 | * == 0 (success, FD is left to library) | |
231 | * < 0 (error) | |
232 | */ | |
233 | int (*on_update_stream)(int sessiond_key, uint32_t state); | |
234 | /* socket to communicate errors with sessiond */ | |
235 | int consumer_error_socket; | |
236 | /* socket to exchange commands with sessiond */ | |
237 | char *consumer_command_sock_path; | |
238 | /* communication with splice */ | |
239 | int consumer_thread_pipe[2]; | |
fb3a43a9 | 240 | int consumer_splice_metadata_pipe[2]; |
50f8ae69 DG |
241 | /* Data stream poll thread pipe. To transfer data stream to the thread */ |
242 | int consumer_data_pipe[2]; | |
3bd1e081 MD |
243 | /* to let the signal handler wake up the fd receiver thread */ |
244 | int consumer_should_quit[2]; | |
fb3a43a9 DG |
245 | /* Metadata poll thread pipe. Transfer metadata stream to it */ |
246 | int consumer_metadata_pipe[2]; | |
3bd1e081 MD |
247 | }; |
248 | ||
249 | /* | |
250 | * Library-level data. One instance per process. | |
251 | */ | |
252 | struct lttng_consumer_global_data { | |
253 | /* | |
e4421fec DG |
254 | * At this time, this lock is used to ensure coherence between the count |
255 | * and number of element in the hash table. It's also a protection for | |
6065ceec DG |
256 | * concurrent read/write between threads. |
257 | * | |
258 | * XXX: We need to see if this lock is still needed with the lockless RCU | |
259 | * hash tables. | |
3bd1e081 MD |
260 | */ |
261 | pthread_mutex_t lock; | |
e4421fec | 262 | |
3bd1e081 | 263 | /* |
3cc2f24a DG |
264 | * Number of streams in the data stream hash table declared outside. |
265 | * Protected by consumer_data.lock. | |
3bd1e081 MD |
266 | */ |
267 | int stream_count; | |
3cc2f24a DG |
268 | |
269 | /* Channel hash table protected by consumer_data.lock. */ | |
e4421fec | 270 | struct lttng_ht *channel_ht; |
3bd1e081 MD |
271 | /* |
272 | * Flag specifying if the local array of FDs needs update in the | |
273 | * poll function. Protected by consumer_data.lock. | |
274 | */ | |
275 | unsigned int need_update; | |
276 | enum lttng_consumer_type type; | |
00e2e675 DG |
277 | |
278 | /* | |
279 | * Relayd socket(s) hashtable indexed by network sequence number. Each | |
280 | * stream has an index which associate the right relayd socket to use. | |
281 | */ | |
282 | struct lttng_ht *relayd_ht; | |
53632229 DG |
283 | |
284 | /* | |
285 | * This hash table contains all streams (metadata and data) indexed by | |
286 | * session id. In other words, the ht is indexed by session id and each | |
287 | * bucket contains the list of associated streams. | |
288 | * | |
289 | * This HT uses the "node_session_id" of the consumer stream. | |
290 | */ | |
291 | struct lttng_ht *stream_list_ht; | |
3bd1e081 MD |
292 | }; |
293 | ||
43c34bc3 DG |
294 | /* Defined in consumer.c and coupled with explanations */ |
295 | extern struct lttng_ht *metadata_ht; | |
296 | extern struct lttng_ht *data_ht; | |
297 | ||
e4421fec DG |
298 | /* |
299 | * Init consumer data structures. | |
300 | */ | |
301 | extern void lttng_consumer_init(void); | |
302 | ||
3bd1e081 MD |
303 | /* |
304 | * Set the error socket for communication with a session daemon. | |
305 | */ | |
306 | extern void lttng_consumer_set_error_sock( | |
307 | struct lttng_consumer_local_data *ctx, int sock); | |
308 | ||
309 | /* | |
310 | * Set the command socket path for communication with a session daemon. | |
311 | */ | |
312 | extern void lttng_consumer_set_command_sock_path( | |
313 | struct lttng_consumer_local_data *ctx, char *sock); | |
314 | ||
315 | /* | |
316 | * Send return code to session daemon. | |
317 | * | |
318 | * Returns the return code of sendmsg : the number of bytes transmitted or -1 | |
319 | * on error. | |
320 | */ | |
321 | extern int lttng_consumer_send_error( | |
322 | struct lttng_consumer_local_data *ctx, int cmd); | |
323 | ||
324 | /* | |
325 | * Called from signal handler to ensure a clean exit. | |
326 | */ | |
327 | extern void lttng_consumer_should_exit( | |
328 | struct lttng_consumer_local_data *ctx); | |
329 | ||
330 | /* | |
331 | * Cleanup the daemon's socket on exit. | |
332 | */ | |
333 | extern void lttng_consumer_cleanup(void); | |
334 | ||
335 | /* | |
336 | * Flush pending writes to trace output disk file. | |
337 | */ | |
338 | extern void lttng_consumer_sync_trace_file( | |
339 | struct lttng_consumer_stream *stream, off_t orig_offset); | |
340 | ||
341 | /* | |
342 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
343 | * should exit, 0 if data is available on the command socket | |
344 | */ | |
345 | extern int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll); | |
346 | ||
3bd1e081 MD |
347 | extern struct lttng_consumer_stream *consumer_allocate_stream( |
348 | int channel_key, int stream_key, | |
349 | int shm_fd, int wait_fd, | |
350 | enum lttng_consumer_stream_state state, | |
351 | uint64_t mmap_len, | |
352 | enum lttng_event_output output, | |
6df2e2c9 MD |
353 | const char *path_name, |
354 | uid_t uid, | |
00e2e675 DG |
355 | gid_t gid, |
356 | int net_index, | |
c80048c6 | 357 | int metadata_flag, |
53632229 | 358 | uint64_t session_id, |
c80048c6 | 359 | int *alloc_ret); |
e316aad5 DG |
360 | extern void consumer_del_stream(struct lttng_consumer_stream *stream, |
361 | struct lttng_ht *ht); | |
362 | extern void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, | |
363 | struct lttng_ht *ht); | |
3bd1e081 MD |
364 | extern void consumer_del_channel(struct lttng_consumer_channel *channel); |
365 | extern struct lttng_consumer_channel *consumer_allocate_channel( | |
366 | int channel_key, | |
367 | int shm_fd, int wait_fd, | |
368 | uint64_t mmap_len, | |
c30aaa51 MD |
369 | uint64_t max_sb_size, |
370 | unsigned int nb_init_streams); | |
3bd1e081 MD |
371 | int consumer_add_channel(struct lttng_consumer_channel *channel); |
372 | ||
00e2e675 | 373 | /* lttng-relayd consumer command */ |
00e2e675 DG |
374 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( |
375 | int net_seq_idx); | |
376 | struct consumer_relayd_sock_pair *consumer_find_relayd(int key); | |
377 | int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream, | |
378 | size_t data_size); | |
c869f647 | 379 | void consumer_steal_stream_key(int key, struct lttng_ht *ht); |
00e2e675 | 380 | |
3bd1e081 MD |
381 | extern struct lttng_consumer_local_data *lttng_consumer_create( |
382 | enum lttng_consumer_type type, | |
4078b776 | 383 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 384 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
385 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
386 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
387 | int (*update_stream)(int sessiond_key, uint32_t state)); | |
388 | extern void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx); | |
4078b776 | 389 | extern ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 390 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
391 | struct lttng_consumer_stream *stream, unsigned long len, |
392 | unsigned long padding); | |
4078b776 | 393 | extern ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 394 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
395 | struct lttng_consumer_stream *stream, unsigned long len, |
396 | unsigned long padding); | |
3bd1e081 MD |
397 | extern int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, |
398 | struct lttng_consumer_stream *stream); | |
399 | extern int lttng_consumer_get_produced_snapshot( | |
400 | struct lttng_consumer_local_data *ctx, | |
401 | struct lttng_consumer_stream *stream, | |
402 | unsigned long *pos); | |
7d980def DG |
403 | extern void *consumer_thread_metadata_poll(void *data); |
404 | extern void *consumer_thread_data_poll(void *data); | |
405 | extern void *consumer_thread_sessiond_poll(void *data); | |
3bd1e081 MD |
406 | extern int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
407 | int sock, struct pollfd *consumer_sockpoll); | |
408 | ||
4078b776 | 409 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
410 | struct lttng_consumer_local_data *ctx); |
411 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream); | |
7735ef9e DG |
412 | int consumer_add_relayd_socket(int net_seq_idx, int sock_type, |
413 | struct lttng_consumer_local_data *ctx, int sock, | |
414 | struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock); | |
a6ba4fe1 DG |
415 | void consumer_flag_relayd_for_destroy( |
416 | struct consumer_relayd_sock_pair *relayd); | |
ca22feea | 417 | int consumer_data_available(uint64_t id); |
d41f73b7 | 418 | |
f02e1e8a | 419 | #endif /* LIB_CONSUMER_H */ |