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_ROTATION_GET_INFO
= 46,
106 LTTNG_SESSION_GET_CURRENT_OUTPUT
= 48,
109 enum lttcomm_relayd_command
{
110 RELAYD_ADD_STREAM
= 1,
111 RELAYD_CREATE_SESSION
= 2,
112 RELAYD_START_DATA
= 3,
113 RELAYD_UPDATE_SYNC_INFO
= 4,
115 RELAYD_SEND_METADATA
= 6,
116 RELAYD_CLOSE_STREAM
= 7,
117 RELAYD_DATA_PENDING
= 8,
118 RELAYD_QUIESCENT_CONTROL
= 9,
119 RELAYD_BEGIN_DATA_PENDING
= 10,
120 RELAYD_END_DATA_PENDING
= 11,
121 RELAYD_ADD_INDEX
= 12,
122 RELAYD_SEND_INDEX
= 13,
123 RELAYD_CLOSE_INDEX
= 14,
124 /* Live-reading commands (2.4+). */
125 RELAYD_LIST_SESSIONS
= 15,
126 /* All streams of the channel have been sent to the relayd (2.4+). */
127 RELAYD_STREAMS_SENT
= 16,
128 /* Ask the relay to reset the metadata trace file (2.8+) */
129 RELAYD_RESET_METADATA
= 17,
130 /* Ask the relay to rotate a stream file (2.11+) */
131 RELAYD_ROTATE_STREAM
= 18,
132 /* Rename a chunk after the rotation is completed (2.11+) */
133 RELAYD_ROTATE_RENAME
= 19,
134 /* Check if a chunk has data pending (2.11+) */
135 RELAYD_ROTATE_PENDING
= 20,
136 /* Create a folder on the relayd FS (2.11+) */
141 * lttcomm error code.
143 enum lttcomm_return_code
{
144 LTTCOMM_CONSUMERD_SUCCESS
= 0, /* Everything went fine. */
145 LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
= 1, /* Command socket ready */
146 LTTCOMM_CONSUMERD_SUCCESS_RECV_FD
, /* Success on receiving fds */
147 LTTCOMM_CONSUMERD_ERROR_RECV_FD
, /* Error on receiving fds */
148 LTTCOMM_CONSUMERD_ERROR_RECV_CMD
, /* Error on receiving command */
149 LTTCOMM_CONSUMERD_POLL_ERROR
, /* Error in polling thread */
150 LTTCOMM_CONSUMERD_POLL_NVAL
, /* Poll on closed fd */
151 LTTCOMM_CONSUMERD_POLL_HUP
, /* All fds have hungup */
152 LTTCOMM_CONSUMERD_EXIT_SUCCESS
, /* Consumerd exiting normally */
153 LTTCOMM_CONSUMERD_EXIT_FAILURE
, /* Consumerd exiting on error */
154 LTTCOMM_CONSUMERD_OUTFD_ERROR
, /* Error opening the tracefile */
155 LTTCOMM_CONSUMERD_SPLICE_EBADF
, /* EBADF from splice(2) */
156 LTTCOMM_CONSUMERD_SPLICE_EINVAL
, /* EINVAL from splice(2) */
157 LTTCOMM_CONSUMERD_SPLICE_ENOMEM
, /* ENOMEM from splice(2) */
158 LTTCOMM_CONSUMERD_SPLICE_ESPIPE
, /* ESPIPE from splice(2) */
159 LTTCOMM_CONSUMERD_ENOMEM
, /* Consumer is out of memory */
160 LTTCOMM_CONSUMERD_ERROR_METADATA
, /* Error with metadata. */
161 LTTCOMM_CONSUMERD_FATAL
, /* Fatal error. */
162 LTTCOMM_CONSUMERD_RELAYD_FAIL
, /* Error on remote relayd */
163 LTTCOMM_CONSUMERD_CHANNEL_FAIL
, /* Channel creation failed. */
164 LTTCOMM_CONSUMERD_CHAN_NOT_FOUND
, /* Channel not found. */
165 LTTCOMM_CONSUMERD_ALREADY_SET
, /* Resource already set. */
167 /* MUST be last element */
168 LTTCOMM_NR
, /* Last element */
171 /* lttng socket protocol. */
172 enum lttcomm_sock_proto
{
178 * Index in the net_families array below. Please keep in sync!
180 enum lttcomm_sock_domain
{
185 enum lttcomm_metadata_command
{
186 LTTCOMM_METADATA_REQUEST
= 1,
190 * Commands sent from the consumerd to the sessiond to request if new metadata
191 * is available. This message is used to find the per UID _or_ per PID registry
192 * for the channel key. For per UID lookup, the triplet
193 * bits_per_long/uid/session_id is used. On lookup failure, we search for the
194 * per PID registry indexed by session id ignoring the other values.
196 struct lttcomm_metadata_request_msg
{
197 uint64_t session_id
; /* Tracing session id */
198 uint64_t session_id_per_pid
; /* Tracing session id for per-pid */
199 uint32_t bits_per_long
; /* Consumer ABI */
201 uint64_t key
; /* Metadata channel key. */
204 struct lttcomm_sockaddr
{
205 enum lttcomm_sock_domain type
;
207 struct sockaddr_in sin
;
208 struct sockaddr_in6 sin6
;
212 struct lttcomm_sock
{
214 enum lttcomm_sock_proto proto
;
215 struct lttcomm_sockaddr sockaddr
;
216 const struct lttcomm_proto_ops
*ops
;
220 * Relayd sock. Adds the protocol version to use for the communications with
223 struct lttcomm_relayd_sock
{
224 struct lttcomm_sock sock
;
229 struct lttcomm_net_family
{
231 int (*create
) (struct lttcomm_sock
*sock
, int type
, int proto
);
234 struct lttcomm_proto_ops
{
235 int (*bind
) (struct lttcomm_sock
*sock
);
236 int (*close
) (struct lttcomm_sock
*sock
);
237 int (*connect
) (struct lttcomm_sock
*sock
);
238 struct lttcomm_sock
*(*accept
) (struct lttcomm_sock
*sock
);
239 int (*listen
) (struct lttcomm_sock
*sock
, int backlog
);
240 ssize_t (*recvmsg
) (struct lttcomm_sock
*sock
, void *buf
, size_t len
,
242 ssize_t (*sendmsg
) (struct lttcomm_sock
*sock
, const void *buf
,
243 size_t len
, int flags
);
247 * Data structure received from lttng client to session daemon.
249 struct lttcomm_session_msg
{
250 uint32_t cmd_type
; /* enum lttcomm_sessiond_command */
251 struct lttng_session session
;
252 struct lttng_domain domain
;
256 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
257 struct lttng_event event LTTNG_PACKED
;
258 /* Length of following filter expression. */
259 uint32_t expression_len
;
260 /* Length of following bytecode for filter. */
261 uint32_t bytecode_len
;
263 uint32_t exclusion_count
;
265 * After this structure, the following variable-length
266 * items are transmitted:
267 * - char exclusion_names[LTTNG_SYMBOL_NAME_LEN][exclusion_count]
268 * - unsigned char filter_expression[expression_len]
269 * - unsigned char filter_bytecode[bytecode_len]
271 } LTTNG_PACKED enable
;
273 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
274 struct lttng_event event LTTNG_PACKED
;
275 /* Length of following filter expression. */
276 uint32_t expression_len
;
277 /* Length of following bytecode for filter. */
278 uint32_t bytecode_len
;
280 * After this structure, the following variable-length
281 * items are transmitted:
282 * - unsigned char filter_expression[expression_len]
283 * - unsigned char filter_bytecode[bytecode_len]
285 } LTTNG_PACKED disable
;
288 struct lttng_channel chan LTTNG_PACKED
;
289 /* struct lttng_channel_extended is already packed. */
290 struct lttng_channel_extended extended
;
291 } LTTNG_PACKED channel
;
294 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
295 struct lttng_event_context ctx LTTNG_PACKED
;
296 uint32_t provider_name_len
;
297 uint32_t context_name_len
;
298 } LTTNG_PACKED context
;
299 /* Use by register_consumer */
305 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
307 struct lttng_calibrate calibrate
;
308 /* Used by the set_consumer_url and used by create_session also call */
310 /* Number of lttng_uri following */
314 struct lttng_snapshot_output output LTTNG_PACKED
;
315 } LTTNG_PACKED snapshot_output
;
318 struct lttng_snapshot_output output LTTNG_PACKED
;
319 } LTTNG_PACKED snapshot_record
;
322 unsigned int timer_interval
; /* usec */
323 } LTTNG_PACKED session_live
;
325 struct lttng_save_session_attr attr
; /* struct already packed */
326 } LTTNG_PACKED save_session
;
328 char shm_path
[PATH_MAX
];
329 } LTTNG_PACKED set_shm_path
;
332 } LTTNG_PACKED pid_tracker
;
335 } LTTNG_PACKED trigger
;
337 uint64_t rotation_id
;
338 } LTTNG_PACKED get_rotation_info
;
342 #define LTTNG_FILTER_MAX_LEN 65536
345 * Filter bytecode data. The reloc table is located at the end of the
346 * bytecode. It is made of tuples: (uint16_t, var. len. string). It
347 * starts at reloc_table_offset.
349 #define LTTNG_FILTER_PADDING 32
350 struct lttng_filter_bytecode
{
351 uint32_t len
; /* len of data */
352 uint32_t reloc_table_offset
;
354 char padding
[LTTNG_FILTER_PADDING
];
359 * Event exclusion data. At the end of the structure, there will actually
360 * by zero or more names, where the actual number of names is given by
361 * the 'count' item of the structure.
363 #define LTTNG_EVENT_EXCLUSION_PADDING 32
364 struct lttng_event_exclusion
{
366 char padding
[LTTNG_EVENT_EXCLUSION_PADDING
];
367 char names
[0][LTTNG_SYMBOL_NAME_LEN
];
370 #define LTTNG_EVENT_EXCLUSION_NAME_AT(_exclusion, _i) \
371 (&(_exclusion)->names[_i][0])
374 * Event command header.
376 struct lttcomm_event_command_header
{
377 /* Number of events */
382 * Event extended info header. This is the structure preceding each
383 * extended info data.
385 struct lttcomm_event_extended_header
{
387 * Size of filter string immediately following this header.
388 * This size includes the terminal null character.
393 * Number of exclusion names, immediately following the filter
394 * string. Each exclusion name has a fixed length of
395 * LTTNG_SYMBOL_NAME_LEN bytes, including the terminal null
398 uint32_t nb_exclusions
;
402 * Data structure for the response from sessiond to the lttng client.
404 struct lttcomm_lttng_msg
{
405 uint32_t cmd_type
; /* enum lttcomm_sessiond_command */
406 uint32_t ret_code
; /* enum lttcomm_return_code */
407 uint32_t pid
; /* pid_t */
408 uint32_t cmd_header_size
;
412 struct lttcomm_lttng_output_id
{
417 * lttcomm_consumer_msg is the message sent from sessiond to consumerd
418 * to either add a channel, add a stream, update a stream, or stop
421 struct lttcomm_consumer_msg
{
422 uint32_t cmd_type
; /* enum consumerd_command */
425 uint64_t channel_key
;
427 char pathname
[PATH_MAX
];
431 /* nb_init_streams is the number of streams open initially. */
432 uint32_t nb_init_streams
;
433 char name
[LTTNG_SYMBOL_NAME_LEN
];
434 /* Use splice or mmap to consume this fd */
435 enum lttng_event_output output
;
436 int type
; /* Per cpu or metadata. */
437 uint64_t tracefile_size
; /* bytes */
438 uint32_t tracefile_count
; /* number of tracefiles */
439 /* If the channel's streams have to be monitored or not. */
441 /* timer to check the streams usage in live mode (usec). */
442 unsigned int live_timer_interval
;
443 /* timer to sample a channel's positions (usec). */
444 unsigned int monitor_timer_interval
;
445 } LTTNG_PACKED channel
; /* Only used by Kernel. */
448 uint64_t channel_key
;
449 int32_t cpu
; /* On which CPU this stream is assigned. */
450 /* Tells the consumer if the stream should be or not monitored. */
452 } LTTNG_PACKED stream
; /* Only used by Kernel. */
455 enum lttng_stream_type type
;
456 /* Open socket to the relayd */
457 struct lttcomm_relayd_sock sock
;
458 /* Tracing session id associated to the relayd. */
460 /* Relayd session id, only used with control socket. */
461 uint64_t relayd_session_id
;
462 } LTTNG_PACKED relayd_sock
;
464 uint64_t net_seq_idx
;
465 } LTTNG_PACKED destroy_relayd
;
468 } LTTNG_PACKED data_pending
;
470 uint64_t subbuf_size
; /* bytes */
471 uint64_t num_subbuf
; /* power of 2 */
472 int32_t overwrite
; /* 1: overwrite, 0: discard */
473 uint32_t switch_timer_interval
; /* usec */
474 uint32_t read_timer_interval
; /* usec */
475 unsigned int live_timer_interval
; /* usec */
476 uint32_t monitor_timer_interval
; /* usec */
477 int32_t output
; /* splice, mmap */
478 int32_t type
; /* metadata or per_cpu */
479 uint64_t session_id
; /* Tracing session id */
480 char pathname
[PATH_MAX
]; /* Channel file path. */
481 char name
[LTTNG_SYMBOL_NAME_LEN
]; /* Channel name. */
482 uint32_t uid
; /* User ID of the session */
483 uint32_t gid
; /* Group ID ot the session */
484 uint64_t relayd_id
; /* Relayd id if apply. */
485 uint64_t key
; /* Unique channel key. */
486 unsigned char uuid
[UUID_LEN
]; /* uuid for ust tracer. */
487 uint32_t chan_id
; /* Channel ID on the tracer side. */
488 uint64_t tracefile_size
; /* bytes */
489 uint32_t tracefile_count
; /* number of tracefiles */
490 uint64_t session_id_per_pid
; /* Per-pid session ID. */
491 /* Tells the consumer if the stream should be or not monitored. */
494 * For UST per UID buffers, this is the application UID of the
495 * channel. This can be different from the user UID requesting the
496 * channel creation and used for the rights on the stream file
497 * because the application can be in the tracing for instance.
499 uint32_t ust_app_uid
;
500 int64_t blocking_timeout
;
501 char root_shm_path
[PATH_MAX
];
502 char shm_path
[PATH_MAX
];
503 } LTTNG_PACKED ask_channel
;
506 } LTTNG_PACKED get_channel
;
509 } LTTNG_PACKED destroy_channel
;
511 uint64_t key
; /* Metadata channel key. */
512 uint64_t target_offset
; /* Offset in the consumer */
513 uint64_t len
; /* Length of metadata to be received. */
514 uint64_t version
; /* Version of the metadata. */
515 } LTTNG_PACKED push_metadata
;
517 uint64_t key
; /* Metadata channel key. */
518 } LTTNG_PACKED close_metadata
;
520 uint64_t key
; /* Metadata channel key. */
521 } LTTNG_PACKED setup_metadata
;
523 uint64_t key
; /* Channel key. */
524 } LTTNG_PACKED flush_channel
;
526 uint64_t key
; /* Channel key. */
527 } LTTNG_PACKED clear_quiescent_channel
;
529 char pathname
[PATH_MAX
];
530 /* Indicate if the snapshot goes on the relayd or locally. */
532 uint32_t metadata
; /* This a metadata snapshot. */
533 uint64_t relayd_id
; /* Relayd id if apply. */
535 uint64_t nb_packets_per_stream
;
536 } LTTNG_PACKED snapshot_channel
;
538 uint64_t channel_key
;
539 uint64_t net_seq_idx
;
540 } LTTNG_PACKED sent_streams
;
543 uint64_t channel_key
;
544 } LTTNG_PACKED discarded_events
;
547 uint64_t channel_key
;
548 } LTTNG_PACKED lost_packets
;
551 } LTTNG_PACKED regenerate_metadata
;
553 char pathname
[PATH_MAX
];
554 uint32_t metadata
; /* This is a metadata channel. */
555 uint64_t relayd_id
; /* Relayd id if apply. */
557 uint64_t new_chunk_id
;
558 } LTTNG_PACKED rotate_channel
;
560 char old_path
[LTTNG_PATH_MAX
];
561 char new_path
[LTTNG_PATH_MAX
];
562 uint64_t relayd_id
; /* Relayd id if apply. */
566 } LTTNG_PACKED rotate_rename
;
571 } LTTNG_PACKED rotate_pending_relay
;
573 char path
[LTTNG_PATH_MAX
];
574 uint64_t relayd_id
; /* Relayd id if apply. */
578 } LTTNG_PACKED mkdir
;
583 * Channel monitoring message returned to the session daemon on every
584 * monitor timer expiration.
586 struct lttcomm_consumer_channel_monitor_msg
{
587 /* Key of the sampled channel. */
590 * Lowest and highest usage (bytes) at the moment the sample was taken.
592 uint64_t lowest
, highest
;
596 * Status message returned to the sessiond after a received command.
598 struct lttcomm_consumer_status_msg
{
599 enum lttcomm_return_code ret_code
;
602 struct lttcomm_consumer_status_channel
{
603 enum lttcomm_return_code ret_code
;
605 unsigned int stream_count
;
608 #ifdef HAVE_LIBLTTNG_UST_CTL
610 #include <lttng/ust-abi.h>
613 * Data structure for the commands sent from sessiond to UST.
615 struct lttcomm_ust_msg
{
619 struct lttng_ust_channel channel
;
620 struct lttng_ust_stream stream
;
621 struct lttng_ust_event event
;
622 struct lttng_ust_context context
;
623 struct lttng_ust_tracer_version version
;
628 * Data structure for the response from UST to the session daemon.
629 * cmd_type is sent back in the reply for validation.
631 struct lttcomm_ust_reply
{
634 uint32_t ret_code
; /* enum lttcomm_return_code */
635 uint32_t ret_val
; /* return value */
638 uint64_t memory_map_size
;
639 } LTTNG_PACKED channel
;
641 uint64_t memory_map_size
;
642 } LTTNG_PACKED stream
;
643 struct lttng_ust_tracer_version version
;
647 #endif /* HAVE_LIBLTTNG_UST_CTL */
649 extern const char *lttcomm_get_readable_code(enum lttcomm_return_code code
);
651 extern int lttcomm_init_inet_sockaddr(struct lttcomm_sockaddr
*sockaddr
,
652 const char *ip
, unsigned int port
);
653 extern int lttcomm_init_inet6_sockaddr(struct lttcomm_sockaddr
*sockaddr
,
654 const char *ip
, unsigned int port
);
656 extern struct lttcomm_sock
*lttcomm_alloc_sock(enum lttcomm_sock_proto proto
);
657 extern int lttcomm_create_sock(struct lttcomm_sock
*sock
);
658 extern struct lttcomm_sock
*lttcomm_alloc_sock_from_uri(struct lttng_uri
*uri
);
659 extern void lttcomm_destroy_sock(struct lttcomm_sock
*sock
);
660 extern struct lttcomm_sock
*lttcomm_alloc_copy_sock(struct lttcomm_sock
*src
);
661 extern void lttcomm_copy_sock(struct lttcomm_sock
*dst
,
662 struct lttcomm_sock
*src
);
664 /* Relayd socket object. */
665 extern struct lttcomm_relayd_sock
*lttcomm_alloc_relayd_sock(
666 struct lttng_uri
*uri
, uint32_t major
, uint32_t minor
);
668 extern int lttcomm_setsockopt_rcv_timeout(int sock
, unsigned int msec
);
669 extern int lttcomm_setsockopt_snd_timeout(int sock
, unsigned int msec
);
671 extern void lttcomm_init(void);
672 /* Get network timeout, in milliseconds */
673 extern unsigned long lttcomm_get_network_timeout(void);
675 #endif /* _LTTNG_SESSIOND_COMM_H */