2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Julien Desfossez <julien.desfossez@polymtl.ca>
4 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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.
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
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.
21 * This header is meant for liblttng and libust internal use ONLY. These
22 * declarations should NOT be considered stable API.
25 #ifndef _LTTNG_SESSIOND_COMM_H
26 #define _LTTNG_SESSIOND_COMM_H
30 #include <lttng/lttng.h>
31 #include <lttng/snapshot-internal.h>
32 #include <lttng/save-internal.h>
33 #include <common/compat/socket.h>
34 #include <common/uri.h>
35 #include <common/defaults.h>
36 #include <common/compat/uuid.h>
38 #include <arpa/inet.h>
39 #include <netinet/in.h>
46 /* Queue size of listen(2) */
47 #define LTTNG_SESSIOND_COMM_MAX_LISTEN 64
49 /* Maximum number of FDs that can be sent over a Unix socket */
50 #define LTTCOMM_MAX_SEND_FDS 4
53 * Get the error code index from 0 since LTTCOMM_OK start at 1000
55 #define LTTCOMM_ERR_INDEX(code) (code - LTTCOMM_CONSUMERD_COMMAND_SOCK_READY)
57 enum lttcomm_sessiond_command
{
59 LTTNG_ADD_CONTEXT
= 0,
61 LTTNG_DISABLE_CHANNEL
= 2,
62 LTTNG_DISABLE_EVENT
= 3,
63 LTTNG_LIST_SYSCALLS
= 4,
64 LTTNG_ENABLE_CHANNEL
= 5,
65 LTTNG_ENABLE_EVENT
= 6,
67 /* Session daemon command */
68 LTTNG_CREATE_SESSION
= 8,
69 LTTNG_DESTROY_SESSION
= 9,
70 LTTNG_LIST_CHANNELS
= 10,
71 LTTNG_LIST_DOMAINS
= 11,
72 LTTNG_LIST_EVENTS
= 12,
73 LTTNG_LIST_SESSIONS
= 13,
74 LTTNG_LIST_TRACEPOINTS
= 14,
75 LTTNG_REGISTER_CONSUMER
= 15,
76 LTTNG_START_TRACE
= 16,
77 LTTNG_STOP_TRACE
= 17,
78 LTTNG_LIST_TRACEPOINT_FIELDS
= 18,
81 LTTNG_DISABLE_CONSUMER
= 19,
82 LTTNG_ENABLE_CONSUMER
= 20,
83 LTTNG_SET_CONSUMER_URI
= 21,
86 LTTNG_DATA_PENDING
= 24,
87 LTTNG_SNAPSHOT_ADD_OUTPUT
= 25,
88 LTTNG_SNAPSHOT_DEL_OUTPUT
= 26,
89 LTTNG_SNAPSHOT_LIST_OUTPUT
= 27,
90 LTTNG_SNAPSHOT_RECORD
= 28,
91 LTTNG_CREATE_SESSION_SNAPSHOT
= 29,
92 LTTNG_CREATE_SESSION_LIVE
= 30,
93 LTTNG_SAVE_SESSION
= 31,
95 /* Session daemon commands (cont.) */
96 LTTNG_SET_SESSION_SHM_PATH
= 40,
99 enum lttcomm_relayd_command
{
100 RELAYD_ADD_STREAM
= 1,
101 RELAYD_CREATE_SESSION
= 2,
102 RELAYD_START_DATA
= 3,
103 RELAYD_UPDATE_SYNC_INFO
= 4,
105 RELAYD_SEND_METADATA
= 6,
106 RELAYD_CLOSE_STREAM
= 7,
107 RELAYD_DATA_PENDING
= 8,
108 RELAYD_QUIESCENT_CONTROL
= 9,
109 RELAYD_BEGIN_DATA_PENDING
= 10,
110 RELAYD_END_DATA_PENDING
= 11,
111 RELAYD_ADD_INDEX
= 12,
112 RELAYD_SEND_INDEX
= 13,
113 RELAYD_CLOSE_INDEX
= 14,
114 /* Live-reading commands (2.4+). */
115 RELAYD_LIST_SESSIONS
= 15,
116 /* All streams of the channel have been sent to the relayd (2.4+). */
117 RELAYD_STREAMS_SENT
= 16,
121 * lttcomm error code.
123 enum lttcomm_return_code
{
124 LTTCOMM_CONSUMERD_SUCCESS
= 0, /* Everything went fine. */
125 LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
= 1, /* Command socket ready */
126 LTTCOMM_CONSUMERD_SUCCESS_RECV_FD
, /* Success on receiving fds */
127 LTTCOMM_CONSUMERD_ERROR_RECV_FD
, /* Error on receiving fds */
128 LTTCOMM_CONSUMERD_ERROR_RECV_CMD
, /* Error on receiving command */
129 LTTCOMM_CONSUMERD_POLL_ERROR
, /* Error in polling thread */
130 LTTCOMM_CONSUMERD_POLL_NVAL
, /* Poll on closed fd */
131 LTTCOMM_CONSUMERD_POLL_HUP
, /* All fds have hungup */
132 LTTCOMM_CONSUMERD_EXIT_SUCCESS
, /* Consumerd exiting normally */
133 LTTCOMM_CONSUMERD_EXIT_FAILURE
, /* Consumerd exiting on error */
134 LTTCOMM_CONSUMERD_OUTFD_ERROR
, /* Error opening the tracefile */
135 LTTCOMM_CONSUMERD_SPLICE_EBADF
, /* EBADF from splice(2) */
136 LTTCOMM_CONSUMERD_SPLICE_EINVAL
, /* EINVAL from splice(2) */
137 LTTCOMM_CONSUMERD_SPLICE_ENOMEM
, /* ENOMEM from splice(2) */
138 LTTCOMM_CONSUMERD_SPLICE_ESPIPE
, /* ESPIPE from splice(2) */
139 LTTCOMM_CONSUMERD_ENOMEM
, /* Consumer is out of memory */
140 LTTCOMM_CONSUMERD_ERROR_METADATA
, /* Error with metadata. */
141 LTTCOMM_CONSUMERD_FATAL
, /* Fatal error. */
142 LTTCOMM_CONSUMERD_RELAYD_FAIL
, /* Error on remote relayd */
143 LTTCOMM_CONSUMERD_CHANNEL_FAIL
, /* Channel creation failed. */
144 LTTCOMM_CONSUMERD_CHAN_NOT_FOUND
, /* Channel not found. */
146 /* MUST be last element */
147 LTTCOMM_NR
, /* Last element */
150 /* lttng socket protocol. */
151 enum lttcomm_sock_proto
{
157 * Index in the net_families array below. Please keep in sync!
159 enum lttcomm_sock_domain
{
164 enum lttcomm_metadata_command
{
165 LTTCOMM_METADATA_REQUEST
= 1,
169 * Commands sent from the consumerd to the sessiond to request if new metadata
170 * is available. This message is used to find the per UID _or_ per PID registry
171 * for the channel key. For per UID lookup, the triplet
172 * bits_per_long/uid/session_id is used. On lookup failure, we search for the
173 * per PID registry indexed by session id ignoring the other values.
175 struct lttcomm_metadata_request_msg
{
176 uint64_t session_id
; /* Tracing session id */
177 uint64_t session_id_per_pid
; /* Tracing session id for per-pid */
178 uint32_t bits_per_long
; /* Consumer ABI */
180 uint64_t key
; /* Metadata channel key. */
183 struct lttcomm_sockaddr
{
184 enum lttcomm_sock_domain type
;
186 struct sockaddr_in sin
;
187 struct sockaddr_in6 sin6
;
191 struct lttcomm_sock
{
193 enum lttcomm_sock_proto proto
;
194 struct lttcomm_sockaddr sockaddr
;
195 const struct lttcomm_proto_ops
*ops
;
199 * Relayd sock. Adds the protocol version to use for the communications with
202 struct lttcomm_relayd_sock
{
203 struct lttcomm_sock sock
;
208 struct lttcomm_net_family
{
210 int (*create
) (struct lttcomm_sock
*sock
, int type
, int proto
);
213 struct lttcomm_proto_ops
{
214 int (*bind
) (struct lttcomm_sock
*sock
);
215 int (*close
) (struct lttcomm_sock
*sock
);
216 int (*connect
) (struct lttcomm_sock
*sock
);
217 struct lttcomm_sock
*(*accept
) (struct lttcomm_sock
*sock
);
218 int (*listen
) (struct lttcomm_sock
*sock
, int backlog
);
219 ssize_t (*recvmsg
) (struct lttcomm_sock
*sock
, void *buf
, size_t len
,
221 ssize_t (*sendmsg
) (struct lttcomm_sock
*sock
, void *buf
, size_t len
,
226 * Data structure received from lttng client to session daemon.
228 struct lttcomm_session_msg
{
229 uint32_t cmd_type
; /* enum lttcomm_sessiond_command */
230 struct lttng_session session
;
231 struct lttng_domain domain
;
235 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
236 struct lttng_event event LTTNG_PACKED
;
237 /* Length of following filter expression. */
238 uint32_t expression_len
;
239 /* Length of following bytecode for filter. */
240 uint32_t bytecode_len
;
242 uint32_t exclusion_count
;
244 * After this structure, the following variable-length
245 * items are transmitted:
246 * - char exclusion_names[LTTNG_SYMBOL_NAME_LEN][exclusion_count]
247 * - unsigned char filter_expression[expression_len]
248 * - unsigned char filter_bytecode[bytecode_len]
250 } LTTNG_PACKED enable
;
252 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
253 struct lttng_event event LTTNG_PACKED
;
254 /* Length of following filter expression. */
255 uint32_t expression_len
;
256 /* Length of following bytecode for filter. */
257 uint32_t bytecode_len
;
259 * After this structure, the following variable-length
260 * items are transmitted:
261 * - unsigned char filter_expression[expression_len]
262 * - unsigned char filter_bytecode[bytecode_len]
264 } LTTNG_PACKED disable
;
267 struct lttng_channel chan LTTNG_PACKED
;
268 } LTTNG_PACKED channel
;
271 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
272 struct lttng_event_context ctx LTTNG_PACKED
;
273 } LTTNG_PACKED context
;
274 /* Use by register_consumer */
280 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
282 struct lttng_calibrate calibrate
;
283 /* Used by the set_consumer_url and used by create_session also call */
285 /* Number of lttng_uri following */
289 struct lttng_snapshot_output output LTTNG_PACKED
;
290 } LTTNG_PACKED snapshot_output
;
293 struct lttng_snapshot_output output LTTNG_PACKED
;
294 } LTTNG_PACKED snapshot_record
;
297 unsigned int timer_interval
; /* usec */
298 } LTTNG_PACKED session_live
;
300 struct lttng_save_session_attr attr
; /* struct already packed */
301 } LTTNG_PACKED save_session
;
303 char shm_path
[PATH_MAX
];
304 } LTTNG_PACKED set_shm_path
;
308 #define LTTNG_FILTER_MAX_LEN 65536
311 * Filter bytecode data. The reloc table is located at the end of the
312 * bytecode. It is made of tuples: (uint16_t, var. len. string). It
313 * starts at reloc_table_offset.
315 #define LTTNG_FILTER_PADDING 32
316 struct lttng_filter_bytecode
{
317 uint32_t len
; /* len of data */
318 uint32_t reloc_table_offset
;
320 char padding
[LTTNG_FILTER_PADDING
];
325 * Event exclusion data. At the end of the structure, there will actually
326 * by zero or more names, where the actual number of names is given by
327 * the 'count' item of the structure.
329 #define LTTNG_EVENT_EXCLUSION_PADDING 32
330 struct lttng_event_exclusion
{
332 char padding
[LTTNG_EVENT_EXCLUSION_PADDING
];
333 char names
[LTTNG_SYMBOL_NAME_LEN
][0];
337 * Data structure for the response from sessiond to the lttng client.
339 struct lttcomm_lttng_msg
{
340 uint32_t cmd_type
; /* enum lttcomm_sessiond_command */
341 uint32_t ret_code
; /* enum lttcomm_return_code */
342 uint32_t pid
; /* pid_t */
344 /* Contains: trace_name + data */
348 struct lttcomm_lttng_output_id
{
353 * lttcomm_consumer_msg is the message sent from sessiond to consumerd
354 * to either add a channel, add a stream, update a stream, or stop
357 struct lttcomm_consumer_msg
{
358 uint32_t cmd_type
; /* enum consumerd_command */
361 uint64_t channel_key
;
363 char pathname
[PATH_MAX
];
367 /* nb_init_streams is the number of streams open initially. */
368 uint32_t nb_init_streams
;
369 char name
[LTTNG_SYMBOL_NAME_LEN
];
370 /* Use splice or mmap to consume this fd */
371 enum lttng_event_output output
;
372 int type
; /* Per cpu or metadata. */
373 uint64_t tracefile_size
; /* bytes */
374 uint32_t tracefile_count
; /* number of tracefiles */
375 /* If the channel's streams have to be monitored or not. */
377 /* timer to check the streams usage in live mode (usec). */
378 unsigned int live_timer_interval
;
379 } LTTNG_PACKED channel
; /* Only used by Kernel. */
382 uint64_t channel_key
;
383 int32_t cpu
; /* On which CPU this stream is assigned. */
384 /* Tells the consumer if the stream should be or not monitored. */
386 } LTTNG_PACKED stream
; /* Only used by Kernel. */
389 enum lttng_stream_type type
;
390 /* Open socket to the relayd */
391 struct lttcomm_relayd_sock sock
;
392 /* Tracing session id associated to the relayd. */
394 /* Relayd session id, only used with control socket. */
395 uint64_t relayd_session_id
;
396 } LTTNG_PACKED relayd_sock
;
398 uint64_t net_seq_idx
;
399 } LTTNG_PACKED destroy_relayd
;
402 } LTTNG_PACKED data_pending
;
404 uint64_t subbuf_size
; /* bytes */
405 uint64_t num_subbuf
; /* power of 2 */
406 int32_t overwrite
; /* 1: overwrite, 0: discard */
407 uint32_t switch_timer_interval
; /* usec */
408 uint32_t read_timer_interval
; /* usec */
409 unsigned int live_timer_interval
; /* usec */
410 int32_t output
; /* splice, mmap */
411 int32_t type
; /* metadata or per_cpu */
412 uint64_t session_id
; /* Tracing session id */
413 char pathname
[PATH_MAX
]; /* Channel file path. */
414 char name
[LTTNG_SYMBOL_NAME_LEN
]; /* Channel name. */
415 uint32_t uid
; /* User ID of the session */
416 uint32_t gid
; /* Group ID ot the session */
417 uint64_t relayd_id
; /* Relayd id if apply. */
418 uint64_t key
; /* Unique channel key. */
419 unsigned char uuid
[UUID_LEN
]; /* uuid for ust tracer. */
420 uint32_t chan_id
; /* Channel ID on the tracer side. */
421 uint64_t tracefile_size
; /* bytes */
422 uint32_t tracefile_count
; /* number of tracefiles */
423 uint64_t session_id_per_pid
; /* Per-pid session ID. */
424 /* Tells the consumer if the stream should be or not monitored. */
427 * For UST per UID buffers, this is the application UID of the
428 * channel. This can be different from the user UID requesting the
429 * channel creation and used for the rights on the stream file
430 * because the application can be in the tracing for instance.
432 uint32_t ust_app_uid
;
433 char root_shm_path
[PATH_MAX
];
434 char shm_path
[PATH_MAX
];
435 } LTTNG_PACKED ask_channel
;
438 } LTTNG_PACKED get_channel
;
441 } LTTNG_PACKED destroy_channel
;
443 uint64_t key
; /* Metadata channel key. */
444 uint64_t target_offset
; /* Offset in the consumer */
445 uint64_t len
; /* Length of metadata to be received. */
446 } LTTNG_PACKED push_metadata
;
448 uint64_t key
; /* Metadata channel key. */
449 } LTTNG_PACKED close_metadata
;
451 uint64_t key
; /* Metadata channel key. */
452 } LTTNG_PACKED setup_metadata
;
454 uint64_t key
; /* Channel key. */
455 } LTTNG_PACKED flush_channel
;
457 char pathname
[PATH_MAX
];
458 /* Indicate if the snapshot goes on the relayd or locally. */
460 uint32_t metadata
; /* This a metadata snapshot. */
461 uint64_t relayd_id
; /* Relayd id if apply. */
463 uint64_t nb_packets_per_stream
;
464 } LTTNG_PACKED snapshot_channel
;
466 uint64_t channel_key
;
467 uint64_t net_seq_idx
;
468 } LTTNG_PACKED sent_streams
;
473 * Status message returned to the sessiond after a received command.
475 struct lttcomm_consumer_status_msg
{
476 enum lttcomm_return_code ret_code
;
479 struct lttcomm_consumer_status_channel
{
480 enum lttcomm_return_code ret_code
;
482 unsigned int stream_count
;
485 #ifdef HAVE_LIBLTTNG_UST_CTL
487 #include <lttng/ust-abi.h>
490 * Data structure for the commands sent from sessiond to UST.
492 struct lttcomm_ust_msg
{
496 struct lttng_ust_channel channel
;
497 struct lttng_ust_stream stream
;
498 struct lttng_ust_event event
;
499 struct lttng_ust_context context
;
500 struct lttng_ust_tracer_version version
;
505 * Data structure for the response from UST to the session daemon.
506 * cmd_type is sent back in the reply for validation.
508 struct lttcomm_ust_reply
{
511 uint32_t ret_code
; /* enum lttcomm_return_code */
512 uint32_t ret_val
; /* return value */
515 uint64_t memory_map_size
;
516 } LTTNG_PACKED channel
;
518 uint64_t memory_map_size
;
519 } LTTNG_PACKED stream
;
520 struct lttng_ust_tracer_version version
;
524 #endif /* HAVE_LIBLTTNG_UST_CTL */
526 extern const char *lttcomm_get_readable_code(enum lttcomm_return_code code
);
528 extern int lttcomm_init_inet_sockaddr(struct lttcomm_sockaddr
*sockaddr
,
529 const char *ip
, unsigned int port
);
530 extern int lttcomm_init_inet6_sockaddr(struct lttcomm_sockaddr
*sockaddr
,
531 const char *ip
, unsigned int port
);
533 extern struct lttcomm_sock
*lttcomm_alloc_sock(enum lttcomm_sock_proto proto
);
534 extern int lttcomm_create_sock(struct lttcomm_sock
*sock
);
535 extern struct lttcomm_sock
*lttcomm_alloc_sock_from_uri(struct lttng_uri
*uri
);
536 extern void lttcomm_destroy_sock(struct lttcomm_sock
*sock
);
537 extern struct lttcomm_sock
*lttcomm_alloc_copy_sock(struct lttcomm_sock
*src
);
538 extern void lttcomm_copy_sock(struct lttcomm_sock
*dst
,
539 struct lttcomm_sock
*src
);
541 /* Relayd socket object. */
542 extern struct lttcomm_relayd_sock
*lttcomm_alloc_relayd_sock(
543 struct lttng_uri
*uri
, uint32_t major
, uint32_t minor
);
545 extern int lttcomm_setsockopt_rcv_timeout(int sock
, unsigned int msec
);
546 extern int lttcomm_setsockopt_snd_timeout(int sock
, unsigned int msec
);
548 extern void lttcomm_init(void);
549 /* Get network timeout, in milliseconds */
550 extern unsigned long lttcomm_get_network_timeout(void);
552 #endif /* _LTTNG_SESSIOND_COMM_H */