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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 | ||
20 | #ifndef _LTTNG_CONSUMER_H | |
21 | #define _LTTNG_CONSUMER_H | |
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, |
3bd1e081 MD |
57 | }; |
58 | ||
59 | /* State of each fd in consumer */ | |
60 | enum lttng_consumer_stream_state { | |
61 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
62 | LTTNG_CONSUMER_PAUSE_STREAM, | |
63 | LTTNG_CONSUMER_DELETE_STREAM, | |
64 | }; | |
65 | ||
3bd1e081 MD |
66 | enum lttng_consumer_type { |
67 | LTTNG_CONSUMER_UNKNOWN = 0, | |
68 | LTTNG_CONSUMER_KERNEL, | |
7753dea8 MD |
69 | LTTNG_CONSUMER64_UST, |
70 | LTTNG_CONSUMER32_UST, | |
3bd1e081 MD |
71 | }; |
72 | ||
73 | struct lttng_consumer_channel { | |
e4421fec | 74 | struct lttng_ht_node_ulong node; |
3bd1e081 MD |
75 | int key; |
76 | uint64_t max_sb_size; /* the subbuffer size for this channel */ | |
77 | int refcount; /* Number of streams referencing this channel */ | |
78 | /* For UST */ | |
79 | int shm_fd; | |
80 | int wait_fd; | |
81 | void *mmap_base; | |
82 | size_t mmap_len; | |
13161846 | 83 | struct lttng_ust_shm_handle *handle; |
3bd1e081 | 84 | int nr_streams; |
b5c5fc29 | 85 | int wait_fd_is_copy; |
5af2f756 | 86 | int cpucount; |
3bd1e081 MD |
87 | }; |
88 | ||
89 | /* Forward declaration for UST. */ | |
13161846 | 90 | struct lttng_ust_lib_ring_buffer; |
3bd1e081 MD |
91 | |
92 | /* | |
93 | * Internal representation of the streams, sessiond_key is used to identify | |
94 | * uniquely a stream. | |
95 | */ | |
96 | struct lttng_consumer_stream { | |
e4421fec | 97 | struct lttng_ht_node_ulong node; |
00e2e675 | 98 | struct lttng_ht_node_ulong waitfd_node; |
3bd1e081 MD |
99 | struct lttng_consumer_channel *chan; /* associated channel */ |
100 | /* | |
101 | * key is the key used by the session daemon to refer to the | |
102 | * object in the consumer daemon. | |
103 | */ | |
104 | int key; | |
105 | int shm_fd; | |
106 | int wait_fd; | |
107 | int out_fd; /* output file to write the data */ | |
108 | off_t out_fd_offset; /* write position in the output file descriptor */ | |
109 | char path_name[PATH_MAX]; /* tracefile name */ | |
110 | enum lttng_consumer_stream_state state; | |
111 | size_t shm_len; | |
112 | void *mmap_base; | |
113 | size_t mmap_len; | |
114 | enum lttng_event_output output; /* splice or mmap */ | |
b5c5fc29 MD |
115 | int shm_fd_is_copy; |
116 | int wait_fd_is_copy; | |
3bd1e081 | 117 | /* For UST */ |
13161846 | 118 | struct lttng_ust_lib_ring_buffer *buf; |
3bd1e081 | 119 | int cpu; |
4078b776 | 120 | int data_read; |
d056b477 | 121 | int hangup_flush_done; |
6df2e2c9 MD |
122 | /* UID/GID of the user owning the session to which stream belongs */ |
123 | uid_t uid; | |
124 | gid_t gid; | |
00e2e675 DG |
125 | /* Network sequence number. Indicating on which relayd socket it goes. */ |
126 | int net_seq_idx; | |
127 | /* Identify if the stream is the metadata */ | |
128 | unsigned int metadata_flag; | |
129 | /* Used when the stream is set for network streaming */ | |
130 | uint64_t relayd_stream_id; | |
131 | }; | |
132 | ||
133 | /* | |
134 | * Internal representation of a relayd socket pair. | |
135 | */ | |
136 | struct consumer_relayd_sock_pair { | |
137 | /* Network sequence number. */ | |
138 | int net_seq_idx; | |
139 | /* Number of stream associated with this relayd */ | |
140 | unsigned int refcount; | |
141 | pthread_mutex_t ctrl_sock_mutex; | |
142 | /* Sockets information */ | |
143 | struct lttcomm_sock control_sock; | |
144 | struct lttcomm_sock data_sock; | |
145 | struct lttng_ht_node_ulong node; | |
3bd1e081 MD |
146 | }; |
147 | ||
148 | /* | |
149 | * UST consumer local data to the program. One or more instance per | |
150 | * process. | |
151 | */ | |
152 | struct lttng_consumer_local_data { | |
4078b776 MD |
153 | /* |
154 | * Function to call when data is available on a buffer. | |
155 | * Returns the number of bytes read, or negative error value. | |
156 | */ | |
157 | ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream, | |
d41f73b7 | 158 | struct lttng_consumer_local_data *ctx); |
3bd1e081 MD |
159 | /* |
160 | * function to call when we receive a new channel, it receives a | |
161 | * newly allocated channel, depending on the return code of this | |
162 | * function, the new channel will be handled by the application | |
163 | * or the library. | |
164 | * | |
165 | * Returns: | |
166 | * > 0 (success, FD is kept by application) | |
167 | * == 0 (success, FD is left to library) | |
168 | * < 0 (error) | |
169 | */ | |
170 | int (*on_recv_channel)(struct lttng_consumer_channel *channel); | |
171 | /* | |
172 | * function to call when we receive a new stream, it receives a | |
173 | * newly allocated stream, depending on the return code of this | |
174 | * function, the new stream will be handled by the application | |
175 | * or the library. | |
176 | * | |
177 | * Returns: | |
178 | * > 0 (success, FD is kept by application) | |
179 | * == 0 (success, FD is left to library) | |
180 | * < 0 (error) | |
181 | */ | |
182 | int (*on_recv_stream)(struct lttng_consumer_stream *stream); | |
183 | /* | |
184 | * function to call when a stream is getting updated by the session | |
185 | * daemon, this function receives the sessiond key and the new | |
186 | * state, depending on the return code of this function the | |
187 | * update of state for the stream is handled by the application | |
188 | * or the library. | |
189 | * | |
190 | * Returns: | |
191 | * > 0 (success, FD is kept by application) | |
192 | * == 0 (success, FD is left to library) | |
193 | * < 0 (error) | |
194 | */ | |
195 | int (*on_update_stream)(int sessiond_key, uint32_t state); | |
196 | /* socket to communicate errors with sessiond */ | |
197 | int consumer_error_socket; | |
198 | /* socket to exchange commands with sessiond */ | |
199 | char *consumer_command_sock_path; | |
200 | /* communication with splice */ | |
201 | int consumer_thread_pipe[2]; | |
202 | /* pipe to wake the poll thread when necessary */ | |
203 | int consumer_poll_pipe[2]; | |
204 | /* to let the signal handler wake up the fd receiver thread */ | |
205 | int consumer_should_quit[2]; | |
206 | }; | |
207 | ||
208 | /* | |
209 | * Library-level data. One instance per process. | |
210 | */ | |
211 | struct lttng_consumer_global_data { | |
212 | /* | |
e4421fec DG |
213 | * At this time, this lock is used to ensure coherence between the count |
214 | * and number of element in the hash table. It's also a protection for | |
6065ceec DG |
215 | * concurrent read/write between threads. |
216 | * | |
217 | * XXX: We need to see if this lock is still needed with the lockless RCU | |
218 | * hash tables. | |
3bd1e081 MD |
219 | */ |
220 | pthread_mutex_t lock; | |
e4421fec | 221 | |
3bd1e081 | 222 | /* |
e4421fec | 223 | * Number of streams in the hash table. Protected by consumer_data.lock. |
3bd1e081 MD |
224 | */ |
225 | int stream_count; | |
226 | /* | |
e4421fec | 227 | * Hash tables of streams and channels. Protected by consumer_data.lock. |
3bd1e081 | 228 | */ |
e4421fec DG |
229 | struct lttng_ht *stream_ht; |
230 | struct lttng_ht *channel_ht; | |
3bd1e081 MD |
231 | /* |
232 | * Flag specifying if the local array of FDs needs update in the | |
233 | * poll function. Protected by consumer_data.lock. | |
234 | */ | |
235 | unsigned int need_update; | |
236 | enum lttng_consumer_type type; | |
00e2e675 DG |
237 | |
238 | /* | |
239 | * Relayd socket(s) hashtable indexed by network sequence number. Each | |
240 | * stream has an index which associate the right relayd socket to use. | |
241 | */ | |
242 | struct lttng_ht *relayd_ht; | |
3bd1e081 MD |
243 | }; |
244 | ||
e4421fec DG |
245 | /* |
246 | * Init consumer data structures. | |
247 | */ | |
248 | extern void lttng_consumer_init(void); | |
249 | ||
3bd1e081 MD |
250 | /* |
251 | * Set the error socket for communication with a session daemon. | |
252 | */ | |
253 | extern void lttng_consumer_set_error_sock( | |
254 | struct lttng_consumer_local_data *ctx, int sock); | |
255 | ||
256 | /* | |
257 | * Set the command socket path for communication with a session daemon. | |
258 | */ | |
259 | extern void lttng_consumer_set_command_sock_path( | |
260 | struct lttng_consumer_local_data *ctx, char *sock); | |
261 | ||
262 | /* | |
263 | * Send return code to session daemon. | |
264 | * | |
265 | * Returns the return code of sendmsg : the number of bytes transmitted or -1 | |
266 | * on error. | |
267 | */ | |
268 | extern int lttng_consumer_send_error( | |
269 | struct lttng_consumer_local_data *ctx, int cmd); | |
270 | ||
271 | /* | |
272 | * Called from signal handler to ensure a clean exit. | |
273 | */ | |
274 | extern void lttng_consumer_should_exit( | |
275 | struct lttng_consumer_local_data *ctx); | |
276 | ||
277 | /* | |
278 | * Cleanup the daemon's socket on exit. | |
279 | */ | |
280 | extern void lttng_consumer_cleanup(void); | |
281 | ||
282 | /* | |
283 | * Flush pending writes to trace output disk file. | |
284 | */ | |
285 | extern void lttng_consumer_sync_trace_file( | |
286 | struct lttng_consumer_stream *stream, off_t orig_offset); | |
287 | ||
288 | /* | |
289 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
290 | * should exit, 0 if data is available on the command socket | |
291 | */ | |
292 | extern int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll); | |
293 | ||
294 | extern int consumer_update_poll_array( | |
295 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, | |
00e2e675 DG |
296 | struct lttng_consumer_stream **local_consumer_streams, |
297 | struct lttng_ht *metadata_ht); | |
3bd1e081 MD |
298 | |
299 | extern struct lttng_consumer_stream *consumer_allocate_stream( | |
300 | int channel_key, int stream_key, | |
301 | int shm_fd, int wait_fd, | |
302 | enum lttng_consumer_stream_state state, | |
303 | uint64_t mmap_len, | |
304 | enum lttng_event_output output, | |
6df2e2c9 MD |
305 | const char *path_name, |
306 | uid_t uid, | |
00e2e675 DG |
307 | gid_t gid, |
308 | int net_index, | |
309 | int metadata_flag); | |
3bd1e081 MD |
310 | extern int consumer_add_stream(struct lttng_consumer_stream *stream); |
311 | extern void consumer_del_stream(struct lttng_consumer_stream *stream); | |
312 | extern void consumer_change_stream_state(int stream_key, | |
313 | enum lttng_consumer_stream_state state); | |
314 | extern void consumer_del_channel(struct lttng_consumer_channel *channel); | |
315 | extern struct lttng_consumer_channel *consumer_allocate_channel( | |
316 | int channel_key, | |
317 | int shm_fd, int wait_fd, | |
318 | uint64_t mmap_len, | |
319 | uint64_t max_sb_size); | |
320 | int consumer_add_channel(struct lttng_consumer_channel *channel); | |
321 | ||
00e2e675 DG |
322 | /* lttng-relayd consumer command */ |
323 | int consumer_add_relayd(struct consumer_relayd_sock_pair *relayd); | |
324 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( | |
325 | int net_seq_idx); | |
326 | struct consumer_relayd_sock_pair *consumer_find_relayd(int key); | |
327 | int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream, | |
328 | size_t data_size); | |
329 | ||
3bd1e081 MD |
330 | extern struct lttng_consumer_local_data *lttng_consumer_create( |
331 | enum lttng_consumer_type type, | |
4078b776 | 332 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 333 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
334 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
335 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
336 | int (*update_stream)(int sessiond_key, uint32_t state)); | |
337 | extern void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx); | |
4078b776 | 338 | extern ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 MD |
339 | struct lttng_consumer_local_data *ctx, |
340 | struct lttng_consumer_stream *stream, unsigned long len); | |
4078b776 | 341 | extern ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 MD |
342 | struct lttng_consumer_local_data *ctx, |
343 | struct lttng_consumer_stream *stream, unsigned long len); | |
344 | extern int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
345 | struct lttng_consumer_stream *stream); | |
346 | extern int lttng_consumer_get_produced_snapshot( | |
347 | struct lttng_consumer_local_data *ctx, | |
348 | struct lttng_consumer_stream *stream, | |
349 | unsigned long *pos); | |
350 | extern void *lttng_consumer_thread_poll_fds(void *data); | |
351 | extern void *lttng_consumer_thread_receive_fds(void *data); | |
352 | extern int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
353 | int sock, struct pollfd *consumer_sockpoll); | |
354 | ||
4078b776 | 355 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
356 | struct lttng_consumer_local_data *ctx); |
357 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream); | |
358 | ||
3bd1e081 | 359 | #endif /* _LTTNG_CONSUMER_H */ |