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
29 #include <lttng/lttng.h>
30 #include <lttng/snapshot-internal.h>
31 #include <lttng/save-internal.h>
32 #include <lttng/channel-internal.h>
33 #include <lttng/trigger/trigger-internal.h>
34 #include <lttng/rotate-internal.h>
35 #include <common/compat/socket.h>
36 #include <common/uri.h>
37 #include <common/defaults.h>
38 #include <common/compat/uuid.h>
40 #include <arpa/inet.h>
41 #include <netinet/in.h>
46 #include <common/unix.h>
48 /* Queue size of listen(2) */
49 #define LTTNG_SESSIOND_COMM_MAX_LISTEN 64
51 /* Maximum number of FDs that can be sent over a Unix socket */
52 #define LTTCOMM_MAX_SEND_FDS 4
55 * Get the error code index from 0 since LTTCOMM_OK start at 1000
57 #define LTTCOMM_ERR_INDEX(code) (code - LTTCOMM_CONSUMERD_COMMAND_SOCK_READY)
59 enum lttcomm_sessiond_command
{
61 LTTNG_ADD_CONTEXT
= 0,
62 /* LTTNG_CALIBRATE used to be here */
63 LTTNG_DISABLE_CHANNEL
= 2,
64 LTTNG_DISABLE_EVENT
= 3,
65 LTTNG_LIST_SYSCALLS
= 4,
66 LTTNG_ENABLE_CHANNEL
= 5,
67 LTTNG_ENABLE_EVENT
= 6,
69 /* Session daemon command */
70 LTTNG_CREATE_SESSION
= 8,
71 LTTNG_DESTROY_SESSION
= 9,
72 LTTNG_LIST_CHANNELS
= 10,
73 LTTNG_LIST_DOMAINS
= 11,
74 LTTNG_LIST_EVENTS
= 12,
75 LTTNG_LIST_SESSIONS
= 13,
76 LTTNG_LIST_TRACEPOINTS
= 14,
77 LTTNG_REGISTER_CONSUMER
= 15,
78 LTTNG_START_TRACE
= 16,
79 LTTNG_STOP_TRACE
= 17,
80 LTTNG_LIST_TRACEPOINT_FIELDS
= 18,
83 LTTNG_DISABLE_CONSUMER
= 19,
84 LTTNG_ENABLE_CONSUMER
= 20,
85 LTTNG_SET_CONSUMER_URI
= 21,
88 LTTNG_DATA_PENDING
= 24,
89 LTTNG_SNAPSHOT_ADD_OUTPUT
= 25,
90 LTTNG_SNAPSHOT_DEL_OUTPUT
= 26,
91 LTTNG_SNAPSHOT_LIST_OUTPUT
= 27,
92 LTTNG_SNAPSHOT_RECORD
= 28,
93 LTTNG_CREATE_SESSION_SNAPSHOT
= 29,
94 LTTNG_CREATE_SESSION_LIVE
= 30,
95 LTTNG_SAVE_SESSION
= 31,
97 LTTNG_UNTRACK_PID
= 33,
98 LTTNG_LIST_TRACKER_PIDS
= 34,
99 LTTNG_SET_SESSION_SHM_PATH
= 40,
100 LTTNG_REGENERATE_METADATA
= 41,
101 LTTNG_REGENERATE_STATEDUMP
= 42,
102 LTTNG_REGISTER_TRIGGER
= 43,
103 LTTNG_UNREGISTER_TRIGGER
= 44,
104 LTTNG_ROTATE_SESSION
= 45,
105 LTTNG_ROTATE_PENDING
= 46,
108 enum lttcomm_relayd_command
{
109 RELAYD_ADD_STREAM
= 1,
110 RELAYD_CREATE_SESSION
= 2,
111 RELAYD_START_DATA
= 3,
112 RELAYD_UPDATE_SYNC_INFO
= 4,
114 RELAYD_SEND_METADATA
= 6,
115 RELAYD_CLOSE_STREAM
= 7,
116 RELAYD_DATA_PENDING
= 8,
117 RELAYD_QUIESCENT_CONTROL
= 9,
118 RELAYD_BEGIN_DATA_PENDING
= 10,
119 RELAYD_END_DATA_PENDING
= 11,
120 RELAYD_ADD_INDEX
= 12,
121 RELAYD_SEND_INDEX
= 13,
122 RELAYD_CLOSE_INDEX
= 14,
123 /* Live-reading commands (2.4+). */
124 RELAYD_LIST_SESSIONS
= 15,
125 /* All streams of the channel have been sent to the relayd (2.4+). */
126 RELAYD_STREAMS_SENT
= 16,
127 /* Ask the relay to reset the metadata trace file (2.8+) */
128 RELAYD_RESET_METADATA
= 17,
129 /* Ask the relay to rotate a stream file (2.11+) */
130 RELAYD_ROTATE_STREAM
= 18,
131 /* Rename a chunk after the rotation is completed (2.11+) */
132 RELAYD_ROTATE_RENAME
= 19,
133 /* Check if a chunk has data pending (2.11+) */
134 RELAYD_ROTATE_PENDING
= 20,
138 * lttcomm error code.
140 enum lttcomm_return_code
{
141 LTTCOMM_CONSUMERD_SUCCESS
= 0, /* Everything went fine. */
142 LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
= 1, /* Command socket ready */
143 LTTCOMM_CONSUMERD_SUCCESS_RECV_FD
, /* Success on receiving fds */
144 LTTCOMM_CONSUMERD_ERROR_RECV_FD
, /* Error on receiving fds */
145 LTTCOMM_CONSUMERD_ERROR_RECV_CMD
, /* Error on receiving command */
146 LTTCOMM_CONSUMERD_POLL_ERROR
, /* Error in polling thread */
147 LTTCOMM_CONSUMERD_POLL_NVAL
, /* Poll on closed fd */
148 LTTCOMM_CONSUMERD_POLL_HUP
, /* All fds have hungup */
149 LTTCOMM_CONSUMERD_EXIT_SUCCESS
, /* Consumerd exiting normally */
150 LTTCOMM_CONSUMERD_EXIT_FAILURE
, /* Consumerd exiting on error */
151 LTTCOMM_CONSUMERD_OUTFD_ERROR
, /* Error opening the tracefile */
152 LTTCOMM_CONSUMERD_SPLICE_EBADF
, /* EBADF from splice(2) */
153 LTTCOMM_CONSUMERD_SPLICE_EINVAL
, /* EINVAL from splice(2) */
154 LTTCOMM_CONSUMERD_SPLICE_ENOMEM
, /* ENOMEM from splice(2) */
155 LTTCOMM_CONSUMERD_SPLICE_ESPIPE
, /* ESPIPE from splice(2) */
156 LTTCOMM_CONSUMERD_ENOMEM
, /* Consumer is out of memory */
157 LTTCOMM_CONSUMERD_ERROR_METADATA
, /* Error with metadata. */
158 LTTCOMM_CONSUMERD_FATAL
, /* Fatal error. */
159 LTTCOMM_CONSUMERD_RELAYD_FAIL
, /* Error on remote relayd */
160 LTTCOMM_CONSUMERD_CHANNEL_FAIL
, /* Channel creation failed. */
161 LTTCOMM_CONSUMERD_CHAN_NOT_FOUND
, /* Channel not found. */
162 LTTCOMM_CONSUMERD_ALREADY_SET
, /* Resource already set. */
164 /* MUST be last element */
165 LTTCOMM_NR
, /* Last element */
168 /* lttng socket protocol. */
169 enum lttcomm_sock_proto
{
175 * Index in the net_families array below. Please keep in sync!
177 enum lttcomm_sock_domain
{
182 enum lttcomm_metadata_command
{
183 LTTCOMM_METADATA_REQUEST
= 1,
187 * Commands sent from the consumerd to the sessiond to request if new metadata
188 * is available. This message is used to find the per UID _or_ per PID registry
189 * for the channel key. For per UID lookup, the triplet
190 * bits_per_long/uid/session_id is used. On lookup failure, we search for the
191 * per PID registry indexed by session id ignoring the other values.
193 struct lttcomm_metadata_request_msg
{
194 uint64_t session_id
; /* Tracing session id */
195 uint64_t session_id_per_pid
; /* Tracing session id for per-pid */
196 uint32_t bits_per_long
; /* Consumer ABI */
198 uint64_t key
; /* Metadata channel key. */
201 struct lttcomm_sockaddr
{
202 enum lttcomm_sock_domain type
;
204 struct sockaddr_in sin
;
205 struct sockaddr_in6 sin6
;
209 struct lttcomm_sock
{
211 enum lttcomm_sock_proto proto
;
212 struct lttcomm_sockaddr sockaddr
;
213 const struct lttcomm_proto_ops
*ops
;
217 * Relayd sock. Adds the protocol version to use for the communications with
220 struct lttcomm_relayd_sock
{
221 struct lttcomm_sock sock
;
226 struct lttcomm_net_family
{
228 int (*create
) (struct lttcomm_sock
*sock
, int type
, int proto
);
231 struct lttcomm_proto_ops
{
232 int (*bind
) (struct lttcomm_sock
*sock
);
233 int (*close
) (struct lttcomm_sock
*sock
);
234 int (*connect
) (struct lttcomm_sock
*sock
);
235 struct lttcomm_sock
*(*accept
) (struct lttcomm_sock
*sock
);
236 int (*listen
) (struct lttcomm_sock
*sock
, int backlog
);
237 ssize_t (*recvmsg
) (struct lttcomm_sock
*sock
, void *buf
, size_t len
,
239 ssize_t (*sendmsg
) (struct lttcomm_sock
*sock
, const void *buf
,
240 size_t len
, int flags
);
244 * Data structure received from lttng client to session daemon.
246 struct lttcomm_session_msg
{
247 uint32_t cmd_type
; /* enum lttcomm_sessiond_command */
248 struct lttng_session session
;
249 struct lttng_domain domain
;
253 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
254 struct lttng_event event LTTNG_PACKED
;
255 /* Length of following filter expression. */
256 uint32_t expression_len
;
257 /* Length of following bytecode for filter. */
258 uint32_t bytecode_len
;
260 uint32_t exclusion_count
;
262 * After this structure, the following variable-length
263 * items are transmitted:
264 * - char exclusion_names[LTTNG_SYMBOL_NAME_LEN][exclusion_count]
265 * - unsigned char filter_expression[expression_len]
266 * - unsigned char filter_bytecode[bytecode_len]
268 } LTTNG_PACKED enable
;
270 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
271 struct lttng_event event LTTNG_PACKED
;
272 /* Length of following filter expression. */
273 uint32_t expression_len
;
274 /* Length of following bytecode for filter. */
275 uint32_t bytecode_len
;
277 * After this structure, the following variable-length
278 * items are transmitted:
279 * - unsigned char filter_expression[expression_len]
280 * - unsigned char filter_bytecode[bytecode_len]
282 } LTTNG_PACKED disable
;
285 struct lttng_channel chan LTTNG_PACKED
;
286 /* struct lttng_channel_extended is already packed. */
287 struct lttng_channel_extended extended
;
288 } LTTNG_PACKED channel
;
291 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
292 struct lttng_event_context ctx LTTNG_PACKED
;
293 uint32_t provider_name_len
;
294 uint32_t context_name_len
;
295 } LTTNG_PACKED context
;
296 /* Use by register_consumer */
302 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
304 struct lttng_calibrate calibrate
;
305 /* Used by the set_consumer_url and used by create_session also call */
307 /* Number of lttng_uri following */
311 struct lttng_snapshot_output output LTTNG_PACKED
;
312 } LTTNG_PACKED snapshot_output
;
315 struct lttng_snapshot_output output LTTNG_PACKED
;
316 } LTTNG_PACKED snapshot_record
;
319 unsigned int timer_interval
; /* usec */
320 } LTTNG_PACKED session_live
;
322 struct lttng_save_session_attr attr
; /* struct already packed */
323 } LTTNG_PACKED save_session
;
325 char shm_path
[PATH_MAX
];
326 } LTTNG_PACKED set_shm_path
;
329 } LTTNG_PACKED pid_tracker
;
332 } LTTNG_PACKED trigger
;
335 } LTTNG_PACKED rotate_pending
;
339 #define LTTNG_FILTER_MAX_LEN 65536
342 * Filter bytecode data. The reloc table is located at the end of the
343 * bytecode. It is made of tuples: (uint16_t, var. len. string). It
344 * starts at reloc_table_offset.
346 #define LTTNG_FILTER_PADDING 32
347 struct lttng_filter_bytecode
{
348 uint32_t len
; /* len of data */
349 uint32_t reloc_table_offset
;
351 char padding
[LTTNG_FILTER_PADDING
];
356 * Event exclusion data. At the end of the structure, there will actually
357 * by zero or more names, where the actual number of names is given by
358 * the 'count' item of the structure.
360 #define LTTNG_EVENT_EXCLUSION_PADDING 32
361 struct lttng_event_exclusion
{
363 char padding
[LTTNG_EVENT_EXCLUSION_PADDING
];
364 char names
[0][LTTNG_SYMBOL_NAME_LEN
];
367 #define LTTNG_EVENT_EXCLUSION_NAME_AT(_exclusion, _i) \
368 (&(_exclusion)->names[_i][0])
371 * Event command header.
373 struct lttcomm_event_command_header
{
374 /* Number of events */
379 * Event extended info header. This is the structure preceding each
380 * extended info data.
382 struct lttcomm_event_extended_header
{
384 * Size of filter string immediately following this header.
385 * This size includes the terminal null character.
390 * Number of exclusion names, immediately following the filter
391 * string. Each exclusion name has a fixed length of
392 * LTTNG_SYMBOL_NAME_LEN bytes, including the terminal null
395 uint32_t nb_exclusions
;
399 * Data structure for the response from sessiond to the lttng client.
401 struct lttcomm_lttng_msg
{
402 uint32_t cmd_type
; /* enum lttcomm_sessiond_command */
403 uint32_t ret_code
; /* enum lttcomm_return_code */
404 uint32_t pid
; /* pid_t */
405 uint32_t cmd_header_size
;
409 struct lttcomm_lttng_output_id
{
414 * lttcomm_consumer_msg is the message sent from sessiond to consumerd
415 * to either add a channel, add a stream, update a stream, or stop
418 struct lttcomm_consumer_msg
{
419 uint32_t cmd_type
; /* enum consumerd_command */
422 uint64_t channel_key
;
424 char pathname
[PATH_MAX
];
428 /* nb_init_streams is the number of streams open initially. */
429 uint32_t nb_init_streams
;
430 char name
[LTTNG_SYMBOL_NAME_LEN
];
431 /* Use splice or mmap to consume this fd */
432 enum lttng_event_output output
;
433 int type
; /* Per cpu or metadata. */
434 uint64_t tracefile_size
; /* bytes */
435 uint32_t tracefile_count
; /* number of tracefiles */
436 /* If the channel's streams have to be monitored or not. */
438 /* timer to check the streams usage in live mode (usec). */
439 unsigned int live_timer_interval
;
440 /* timer to sample a channel's positions (usec). */
441 unsigned int monitor_timer_interval
;
442 } LTTNG_PACKED channel
; /* Only used by Kernel. */
445 uint64_t channel_key
;
446 int32_t cpu
; /* On which CPU this stream is assigned. */
447 /* Tells the consumer if the stream should be or not monitored. */
449 } LTTNG_PACKED stream
; /* Only used by Kernel. */
452 enum lttng_stream_type type
;
453 /* Open socket to the relayd */
454 struct lttcomm_relayd_sock sock
;
455 /* Tracing session id associated to the relayd. */
457 /* Relayd session id, only used with control socket. */
458 uint64_t relayd_session_id
;
459 } LTTNG_PACKED relayd_sock
;
461 uint64_t net_seq_idx
;
462 } LTTNG_PACKED destroy_relayd
;
465 } LTTNG_PACKED data_pending
;
467 uint64_t subbuf_size
; /* bytes */
468 uint64_t num_subbuf
; /* power of 2 */
469 int32_t overwrite
; /* 1: overwrite, 0: discard */
470 uint32_t switch_timer_interval
; /* usec */
471 uint32_t read_timer_interval
; /* usec */
472 unsigned int live_timer_interval
; /* usec */
473 uint32_t monitor_timer_interval
; /* usec */
474 int32_t output
; /* splice, mmap */
475 int32_t type
; /* metadata or per_cpu */
476 uint64_t session_id
; /* Tracing session id */
477 char pathname
[PATH_MAX
]; /* Channel file path. */
478 char name
[LTTNG_SYMBOL_NAME_LEN
]; /* Channel name. */
479 uint32_t uid
; /* User ID of the session */
480 uint32_t gid
; /* Group ID ot the session */
481 uint64_t relayd_id
; /* Relayd id if apply. */
482 uint64_t key
; /* Unique channel key. */
483 unsigned char uuid
[UUID_LEN
]; /* uuid for ust tracer. */
484 uint32_t chan_id
; /* Channel ID on the tracer side. */
485 uint64_t tracefile_size
; /* bytes */
486 uint32_t tracefile_count
; /* number of tracefiles */
487 uint64_t session_id_per_pid
; /* Per-pid session ID. */
488 /* Tells the consumer if the stream should be or not monitored. */
491 * For UST per UID buffers, this is the application UID of the
492 * channel. This can be different from the user UID requesting the
493 * channel creation and used for the rights on the stream file
494 * because the application can be in the tracing for instance.
496 uint32_t ust_app_uid
;
497 int64_t blocking_timeout
;
498 char root_shm_path
[PATH_MAX
];
499 char shm_path
[PATH_MAX
];
500 } LTTNG_PACKED ask_channel
;
503 } LTTNG_PACKED get_channel
;
506 } LTTNG_PACKED destroy_channel
;
508 uint64_t key
; /* Metadata channel key. */
509 uint64_t target_offset
; /* Offset in the consumer */
510 uint64_t len
; /* Length of metadata to be received. */
511 uint64_t version
; /* Version of the metadata. */
512 } LTTNG_PACKED push_metadata
;
514 uint64_t key
; /* Metadata channel key. */
515 } LTTNG_PACKED close_metadata
;
517 uint64_t key
; /* Metadata channel key. */
518 } LTTNG_PACKED setup_metadata
;
520 uint64_t key
; /* Channel key. */
521 } LTTNG_PACKED flush_channel
;
523 uint64_t key
; /* Channel key. */
524 } LTTNG_PACKED clear_quiescent_channel
;
526 char pathname
[PATH_MAX
];
527 /* Indicate if the snapshot goes on the relayd or locally. */
529 uint32_t metadata
; /* This a metadata snapshot. */
530 uint64_t relayd_id
; /* Relayd id if apply. */
532 uint64_t nb_packets_per_stream
;
533 } LTTNG_PACKED snapshot_channel
;
535 uint64_t channel_key
;
536 uint64_t net_seq_idx
;
537 } LTTNG_PACKED sent_streams
;
540 uint64_t channel_key
;
541 } LTTNG_PACKED discarded_events
;
544 uint64_t channel_key
;
545 } LTTNG_PACKED lost_packets
;
548 } LTTNG_PACKED regenerate_metadata
;
550 char pathname
[PATH_MAX
];
551 uint32_t metadata
; /* This is a metadata channel. */
552 uint64_t relayd_id
; /* Relayd id if apply. */
554 uint64_t new_chunk_id
;
555 } LTTNG_PACKED rotate_channel
;
557 char current_path
[PATH_MAX
];
558 char new_path
[PATH_MAX
];
559 uint64_t relayd_id
; /* Relayd id if apply. */
563 } LTTNG_PACKED rotate_rename
;
568 } LTTNG_PACKED rotate_pending_relay
;
573 * Channel monitoring message returned to the session daemon on every
574 * monitor timer expiration.
576 struct lttcomm_consumer_channel_monitor_msg
{
577 /* Key of the sampled channel. */
580 * Lowest and highest usage (bytes) at the moment the sample was taken.
582 uint64_t lowest
, highest
;
586 * Status message returned to the sessiond after a received command.
588 struct lttcomm_consumer_status_msg
{
589 enum lttcomm_return_code ret_code
;
592 struct lttcomm_consumer_status_channel
{
593 enum lttcomm_return_code ret_code
;
595 unsigned int stream_count
;
598 #ifdef HAVE_LIBLTTNG_UST_CTL
600 #include <lttng/ust-abi.h>
603 * Data structure for the commands sent from sessiond to UST.
605 struct lttcomm_ust_msg
{
609 struct lttng_ust_channel channel
;
610 struct lttng_ust_stream stream
;
611 struct lttng_ust_event event
;
612 struct lttng_ust_context context
;
613 struct lttng_ust_tracer_version version
;
618 * Data structure for the response from UST to the session daemon.
619 * cmd_type is sent back in the reply for validation.
621 struct lttcomm_ust_reply
{
624 uint32_t ret_code
; /* enum lttcomm_return_code */
625 uint32_t ret_val
; /* return value */
628 uint64_t memory_map_size
;
629 } LTTNG_PACKED channel
;
631 uint64_t memory_map_size
;
632 } LTTNG_PACKED stream
;
633 struct lttng_ust_tracer_version version
;
637 #endif /* HAVE_LIBLTTNG_UST_CTL */
639 extern const char *lttcomm_get_readable_code(enum lttcomm_return_code code
);
641 extern int lttcomm_init_inet_sockaddr(struct lttcomm_sockaddr
*sockaddr
,
642 const char *ip
, unsigned int port
);
643 extern int lttcomm_init_inet6_sockaddr(struct lttcomm_sockaddr
*sockaddr
,
644 const char *ip
, unsigned int port
);
646 extern struct lttcomm_sock
*lttcomm_alloc_sock(enum lttcomm_sock_proto proto
);
647 extern int lttcomm_create_sock(struct lttcomm_sock
*sock
);
648 extern struct lttcomm_sock
*lttcomm_alloc_sock_from_uri(struct lttng_uri
*uri
);
649 extern void lttcomm_destroy_sock(struct lttcomm_sock
*sock
);
650 extern struct lttcomm_sock
*lttcomm_alloc_copy_sock(struct lttcomm_sock
*src
);
651 extern void lttcomm_copy_sock(struct lttcomm_sock
*dst
,
652 struct lttcomm_sock
*src
);
654 /* Relayd socket object. */
655 extern struct lttcomm_relayd_sock
*lttcomm_alloc_relayd_sock(
656 struct lttng_uri
*uri
, uint32_t major
, uint32_t minor
);
658 extern int lttcomm_setsockopt_rcv_timeout(int sock
, unsigned int msec
);
659 extern int lttcomm_setsockopt_snd_timeout(int sock
, unsigned int msec
);
661 extern void lttcomm_init(void);
662 /* Get network timeout, in milliseconds */
663 extern unsigned long lttcomm_get_network_timeout(void);
665 #endif /* _LTTNG_SESSIOND_COMM_H */