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 <common/compat/socket.h>
33 #include <common/uri.h>
34 #include <common/defaults.h>
35 #include <common/compat/uuid.h>
37 #include <arpa/inet.h>
38 #include <netinet/in.h>
45 /* Queue size of listen(2) */
46 #define LTTNG_SESSIOND_COMM_MAX_LISTEN 64
48 /* Maximum number of FDs that can be sent over a Unix socket */
49 #define LTTCOMM_MAX_SEND_FDS 4
52 * Get the error code index from 0 since LTTCOMM_OK start at 1000
54 #define LTTCOMM_ERR_INDEX(code) (code - LTTCOMM_CONSUMERD_COMMAND_SOCK_READY)
56 enum lttcomm_sessiond_command
{
58 LTTNG_ADD_CONTEXT
= 0,
60 LTTNG_DISABLE_CHANNEL
= 2,
61 LTTNG_DISABLE_EVENT
= 3,
62 LTTNG_LIST_SYSCALLS
= 4,
63 LTTNG_ENABLE_CHANNEL
= 5,
64 LTTNG_ENABLE_EVENT
= 6,
66 /* Session daemon command */
67 LTTNG_CREATE_SESSION
= 8,
68 LTTNG_DESTROY_SESSION
= 9,
69 LTTNG_LIST_CHANNELS
= 10,
70 LTTNG_LIST_DOMAINS
= 11,
71 LTTNG_LIST_EVENTS
= 12,
72 LTTNG_LIST_SESSIONS
= 13,
73 LTTNG_LIST_TRACEPOINTS
= 14,
74 LTTNG_REGISTER_CONSUMER
= 15,
75 LTTNG_START_TRACE
= 16,
76 LTTNG_STOP_TRACE
= 17,
77 LTTNG_LIST_TRACEPOINT_FIELDS
= 18,
80 LTTNG_DISABLE_CONSUMER
= 19,
81 LTTNG_ENABLE_CONSUMER
= 20,
82 LTTNG_SET_CONSUMER_URI
= 21,
85 LTTNG_DATA_PENDING
= 24,
86 LTTNG_SNAPSHOT_ADD_OUTPUT
= 25,
87 LTTNG_SNAPSHOT_DEL_OUTPUT
= 26,
88 LTTNG_SNAPSHOT_LIST_OUTPUT
= 27,
89 LTTNG_SNAPSHOT_RECORD
= 28,
90 LTTNG_CREATE_SESSION_SNAPSHOT
= 29,
91 LTTNG_CREATE_SESSION_LIVE
= 30,
92 LTTNG_SAVE_SESSION
= 31,
94 LTTNG_UNTRACK_PID
= 33,
95 LTTNG_LIST_TRACKER_PIDS
= 34,
96 LTTNG_SET_SESSION_SHM_PATH
= 40,
97 LTTNG_METADATA_REGENERATE
= 41,
100 enum lttcomm_relayd_command
{
101 RELAYD_ADD_STREAM
= 1,
102 RELAYD_CREATE_SESSION
= 2,
103 RELAYD_START_DATA
= 3,
104 RELAYD_UPDATE_SYNC_INFO
= 4,
106 RELAYD_SEND_METADATA
= 6,
107 RELAYD_CLOSE_STREAM
= 7,
108 RELAYD_DATA_PENDING
= 8,
109 RELAYD_QUIESCENT_CONTROL
= 9,
110 RELAYD_BEGIN_DATA_PENDING
= 10,
111 RELAYD_END_DATA_PENDING
= 11,
112 RELAYD_ADD_INDEX
= 12,
113 RELAYD_SEND_INDEX
= 13,
114 RELAYD_CLOSE_INDEX
= 14,
115 /* Live-reading commands (2.4+). */
116 RELAYD_LIST_SESSIONS
= 15,
117 /* All streams of the channel have been sent to the relayd (2.4+). */
118 RELAYD_STREAMS_SENT
= 16,
119 /* Ask the relay to reset the metadata trace file (2.8+) */
120 RELAYD_RESET_METADATA
= 17,
124 * lttcomm error code.
126 enum lttcomm_return_code
{
127 LTTCOMM_CONSUMERD_SUCCESS
= 0, /* Everything went fine. */
128 LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
= 1, /* Command socket ready */
129 LTTCOMM_CONSUMERD_SUCCESS_RECV_FD
, /* Success on receiving fds */
130 LTTCOMM_CONSUMERD_ERROR_RECV_FD
, /* Error on receiving fds */
131 LTTCOMM_CONSUMERD_ERROR_RECV_CMD
, /* Error on receiving command */
132 LTTCOMM_CONSUMERD_POLL_ERROR
, /* Error in polling thread */
133 LTTCOMM_CONSUMERD_POLL_NVAL
, /* Poll on closed fd */
134 LTTCOMM_CONSUMERD_POLL_HUP
, /* All fds have hungup */
135 LTTCOMM_CONSUMERD_EXIT_SUCCESS
, /* Consumerd exiting normally */
136 LTTCOMM_CONSUMERD_EXIT_FAILURE
, /* Consumerd exiting on error */
137 LTTCOMM_CONSUMERD_OUTFD_ERROR
, /* Error opening the tracefile */
138 LTTCOMM_CONSUMERD_SPLICE_EBADF
, /* EBADF from splice(2) */
139 LTTCOMM_CONSUMERD_SPLICE_EINVAL
, /* EINVAL from splice(2) */
140 LTTCOMM_CONSUMERD_SPLICE_ENOMEM
, /* ENOMEM from splice(2) */
141 LTTCOMM_CONSUMERD_SPLICE_ESPIPE
, /* ESPIPE from splice(2) */
142 LTTCOMM_CONSUMERD_ENOMEM
, /* Consumer is out of memory */
143 LTTCOMM_CONSUMERD_ERROR_METADATA
, /* Error with metadata. */
144 LTTCOMM_CONSUMERD_FATAL
, /* Fatal error. */
145 LTTCOMM_CONSUMERD_RELAYD_FAIL
, /* Error on remote relayd */
146 LTTCOMM_CONSUMERD_CHANNEL_FAIL
, /* Channel creation failed. */
147 LTTCOMM_CONSUMERD_CHAN_NOT_FOUND
, /* Channel not found. */
149 /* MUST be last element */
150 LTTCOMM_NR
, /* Last element */
153 /* lttng socket protocol. */
154 enum lttcomm_sock_proto
{
160 * Index in the net_families array below. Please keep in sync!
162 enum lttcomm_sock_domain
{
167 enum lttcomm_metadata_command
{
168 LTTCOMM_METADATA_REQUEST
= 1,
172 * Commands sent from the consumerd to the sessiond to request if new metadata
173 * is available. This message is used to find the per UID _or_ per PID registry
174 * for the channel key. For per UID lookup, the triplet
175 * bits_per_long/uid/session_id is used. On lookup failure, we search for the
176 * per PID registry indexed by session id ignoring the other values.
178 struct lttcomm_metadata_request_msg
{
179 uint64_t session_id
; /* Tracing session id */
180 uint64_t session_id_per_pid
; /* Tracing session id for per-pid */
181 uint32_t bits_per_long
; /* Consumer ABI */
183 uint64_t key
; /* Metadata channel key. */
186 struct lttcomm_sockaddr
{
187 enum lttcomm_sock_domain type
;
189 struct sockaddr_in sin
;
190 struct sockaddr_in6 sin6
;
194 struct lttcomm_sock
{
196 enum lttcomm_sock_proto proto
;
197 struct lttcomm_sockaddr sockaddr
;
198 const struct lttcomm_proto_ops
*ops
;
202 * Relayd sock. Adds the protocol version to use for the communications with
205 struct lttcomm_relayd_sock
{
206 struct lttcomm_sock sock
;
211 struct lttcomm_net_family
{
213 int (*create
) (struct lttcomm_sock
*sock
, int type
, int proto
);
216 struct lttcomm_proto_ops
{
217 int (*bind
) (struct lttcomm_sock
*sock
);
218 int (*close
) (struct lttcomm_sock
*sock
);
219 int (*connect
) (struct lttcomm_sock
*sock
);
220 struct lttcomm_sock
*(*accept
) (struct lttcomm_sock
*sock
);
221 int (*listen
) (struct lttcomm_sock
*sock
, int backlog
);
222 ssize_t (*recvmsg
) (struct lttcomm_sock
*sock
, void *buf
, size_t len
,
224 ssize_t (*sendmsg
) (struct lttcomm_sock
*sock
, const void *buf
,
225 size_t len
, int flags
);
229 * Data structure received from lttng client to session daemon.
231 struct lttcomm_session_msg
{
232 uint32_t cmd_type
; /* enum lttcomm_sessiond_command */
233 struct lttng_session session
;
234 struct lttng_domain domain
;
238 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
239 struct lttng_event event LTTNG_PACKED
;
240 /* Length of following filter expression. */
241 uint32_t expression_len
;
242 /* Length of following bytecode for filter. */
243 uint32_t bytecode_len
;
245 uint32_t exclusion_count
;
247 * After this structure, the following variable-length
248 * items are transmitted:
249 * - char exclusion_names[LTTNG_SYMBOL_NAME_LEN][exclusion_count]
250 * - unsigned char filter_expression[expression_len]
251 * - unsigned char filter_bytecode[bytecode_len]
253 } LTTNG_PACKED enable
;
255 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
256 struct lttng_event event LTTNG_PACKED
;
257 /* Length of following filter expression. */
258 uint32_t expression_len
;
259 /* Length of following bytecode for filter. */
260 uint32_t bytecode_len
;
262 * After this structure, the following variable-length
263 * items are transmitted:
264 * - unsigned char filter_expression[expression_len]
265 * - unsigned char filter_bytecode[bytecode_len]
267 } LTTNG_PACKED disable
;
270 struct lttng_channel chan LTTNG_PACKED
;
271 } LTTNG_PACKED channel
;
274 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
275 struct lttng_event_context ctx LTTNG_PACKED
;
276 uint32_t provider_name_len
;
277 uint32_t context_name_len
;
278 } LTTNG_PACKED context
;
279 /* Use by register_consumer */
285 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
287 struct lttng_calibrate calibrate
;
288 /* Used by the set_consumer_url and used by create_session also call */
290 /* Number of lttng_uri following */
294 struct lttng_snapshot_output output LTTNG_PACKED
;
295 } LTTNG_PACKED snapshot_output
;
298 struct lttng_snapshot_output output LTTNG_PACKED
;
299 } LTTNG_PACKED snapshot_record
;
302 unsigned int timer_interval
; /* usec */
303 } LTTNG_PACKED session_live
;
305 struct lttng_save_session_attr attr
; /* struct already packed */
306 } LTTNG_PACKED save_session
;
308 char shm_path
[PATH_MAX
];
309 } LTTNG_PACKED set_shm_path
;
312 } LTTNG_PACKED pid_tracker
;
316 #define LTTNG_FILTER_MAX_LEN 65536
319 * Filter bytecode data. The reloc table is located at the end of the
320 * bytecode. It is made of tuples: (uint16_t, var. len. string). It
321 * starts at reloc_table_offset.
323 #define LTTNG_FILTER_PADDING 32
324 struct lttng_filter_bytecode
{
325 uint32_t len
; /* len of data */
326 uint32_t reloc_table_offset
;
328 char padding
[LTTNG_FILTER_PADDING
];
333 * Event exclusion data. At the end of the structure, there will actually
334 * by zero or more names, where the actual number of names is given by
335 * the 'count' item of the structure.
337 #define LTTNG_EVENT_EXCLUSION_PADDING 32
338 struct lttng_event_exclusion
{
340 char padding
[LTTNG_EVENT_EXCLUSION_PADDING
];
341 char names
[0][LTTNG_SYMBOL_NAME_LEN
];
344 #define LTTNG_EVENT_EXCLUSION_NAME_AT(_exclusion, _i) \
345 (&(_exclusion)->names[_i][0])
348 * Event command header.
350 struct lttcomm_event_command_header
{
351 /* Number of events */
356 * Event extended info header. This is the structure preceding each
357 * extended info data.
359 struct lttcomm_event_extended_header
{
361 * Size of filter string immediately following this header.
362 * This size includes the terminal null character.
367 * Number of exclusion names, immediately following the filter
368 * string. Each exclusion name has a fixed length of
369 * LTTNG_SYMBOL_NAME_LEN bytes, including the terminal null
372 uint32_t nb_exclusions
;
376 * Channel extended info.
378 struct lttcomm_channel_extended
{
379 uint64_t discarded_events
;
380 uint64_t lost_packets
;
384 * Data structure for the response from sessiond to the lttng client.
386 struct lttcomm_lttng_msg
{
387 uint32_t cmd_type
; /* enum lttcomm_sessiond_command */
388 uint32_t ret_code
; /* enum lttcomm_return_code */
389 uint32_t pid
; /* pid_t */
390 uint32_t cmd_header_size
;
394 struct lttcomm_lttng_output_id
{
399 * lttcomm_consumer_msg is the message sent from sessiond to consumerd
400 * to either add a channel, add a stream, update a stream, or stop
403 struct lttcomm_consumer_msg
{
404 uint32_t cmd_type
; /* enum consumerd_command */
407 uint64_t channel_key
;
409 char pathname
[PATH_MAX
];
413 /* nb_init_streams is the number of streams open initially. */
414 uint32_t nb_init_streams
;
415 char name
[LTTNG_SYMBOL_NAME_LEN
];
416 /* Use splice or mmap to consume this fd */
417 enum lttng_event_output output
;
418 int type
; /* Per cpu or metadata. */
419 uint64_t tracefile_size
; /* bytes */
420 uint32_t tracefile_count
; /* number of tracefiles */
421 /* If the channel's streams have to be monitored or not. */
423 /* timer to check the streams usage in live mode (usec). */
424 unsigned int live_timer_interval
;
425 } LTTNG_PACKED channel
; /* Only used by Kernel. */
428 uint64_t channel_key
;
429 int32_t cpu
; /* On which CPU this stream is assigned. */
430 /* Tells the consumer if the stream should be or not monitored. */
432 } LTTNG_PACKED stream
; /* Only used by Kernel. */
435 enum lttng_stream_type type
;
436 /* Open socket to the relayd */
437 struct lttcomm_relayd_sock sock
;
438 /* Tracing session id associated to the relayd. */
440 /* Relayd session id, only used with control socket. */
441 uint64_t relayd_session_id
;
442 } LTTNG_PACKED relayd_sock
;
444 uint64_t net_seq_idx
;
445 } LTTNG_PACKED destroy_relayd
;
448 } LTTNG_PACKED data_pending
;
450 uint64_t subbuf_size
; /* bytes */
451 uint64_t num_subbuf
; /* power of 2 */
452 int32_t overwrite
; /* 1: overwrite, 0: discard */
453 uint32_t switch_timer_interval
; /* usec */
454 uint32_t read_timer_interval
; /* usec */
455 unsigned int live_timer_interval
; /* usec */
456 int32_t output
; /* splice, mmap */
457 int32_t type
; /* metadata or per_cpu */
458 uint64_t session_id
; /* Tracing session id */
459 char pathname
[PATH_MAX
]; /* Channel file path. */
460 char name
[LTTNG_SYMBOL_NAME_LEN
]; /* Channel name. */
461 uint32_t uid
; /* User ID of the session */
462 uint32_t gid
; /* Group ID ot the session */
463 uint64_t relayd_id
; /* Relayd id if apply. */
464 uint64_t key
; /* Unique channel key. */
465 unsigned char uuid
[UUID_LEN
]; /* uuid for ust tracer. */
466 uint32_t chan_id
; /* Channel ID on the tracer side. */
467 uint64_t tracefile_size
; /* bytes */
468 uint32_t tracefile_count
; /* number of tracefiles */
469 uint64_t session_id_per_pid
; /* Per-pid session ID. */
470 /* Tells the consumer if the stream should be or not monitored. */
473 * For UST per UID buffers, this is the application UID of the
474 * channel. This can be different from the user UID requesting the
475 * channel creation and used for the rights on the stream file
476 * because the application can be in the tracing for instance.
478 uint32_t ust_app_uid
;
479 char root_shm_path
[PATH_MAX
];
480 char shm_path
[PATH_MAX
];
481 } LTTNG_PACKED ask_channel
;
484 } LTTNG_PACKED get_channel
;
487 } LTTNG_PACKED destroy_channel
;
489 uint64_t key
; /* Metadata channel key. */
490 uint64_t target_offset
; /* Offset in the consumer */
491 uint64_t len
; /* Length of metadata to be received. */
492 uint64_t version
; /* Version of the metadata. */
493 } LTTNG_PACKED push_metadata
;
495 uint64_t key
; /* Metadata channel key. */
496 } LTTNG_PACKED close_metadata
;
498 uint64_t key
; /* Metadata channel key. */
499 } LTTNG_PACKED setup_metadata
;
501 uint64_t key
; /* Channel key. */
502 } LTTNG_PACKED flush_channel
;
504 char pathname
[PATH_MAX
];
505 /* Indicate if the snapshot goes on the relayd or locally. */
507 uint32_t metadata
; /* This a metadata snapshot. */
508 uint64_t relayd_id
; /* Relayd id if apply. */
510 uint64_t nb_packets_per_stream
;
511 } LTTNG_PACKED snapshot_channel
;
513 uint64_t channel_key
;
514 uint64_t net_seq_idx
;
515 } LTTNG_PACKED sent_streams
;
518 uint64_t channel_key
;
519 } LTTNG_PACKED discarded_events
;
522 uint64_t channel_key
;
523 } LTTNG_PACKED lost_packets
;
526 } LTTNG_PACKED metadata_regenerate
;
531 * Status message returned to the sessiond after a received command.
533 struct lttcomm_consumer_status_msg
{
534 enum lttcomm_return_code ret_code
;
537 struct lttcomm_consumer_status_channel
{
538 enum lttcomm_return_code ret_code
;
540 unsigned int stream_count
;
543 #ifdef HAVE_LIBLTTNG_UST_CTL
545 #include <lttng/ust-abi.h>
548 * Data structure for the commands sent from sessiond to UST.
550 struct lttcomm_ust_msg
{
554 struct lttng_ust_channel channel
;
555 struct lttng_ust_stream stream
;
556 struct lttng_ust_event event
;
557 struct lttng_ust_context context
;
558 struct lttng_ust_tracer_version version
;
563 * Data structure for the response from UST to the session daemon.
564 * cmd_type is sent back in the reply for validation.
566 struct lttcomm_ust_reply
{
569 uint32_t ret_code
; /* enum lttcomm_return_code */
570 uint32_t ret_val
; /* return value */
573 uint64_t memory_map_size
;
574 } LTTNG_PACKED channel
;
576 uint64_t memory_map_size
;
577 } LTTNG_PACKED stream
;
578 struct lttng_ust_tracer_version version
;
582 #endif /* HAVE_LIBLTTNG_UST_CTL */
584 extern const char *lttcomm_get_readable_code(enum lttcomm_return_code code
);
586 extern int lttcomm_init_inet_sockaddr(struct lttcomm_sockaddr
*sockaddr
,
587 const char *ip
, unsigned int port
);
588 extern int lttcomm_init_inet6_sockaddr(struct lttcomm_sockaddr
*sockaddr
,
589 const char *ip
, unsigned int port
);
591 extern struct lttcomm_sock
*lttcomm_alloc_sock(enum lttcomm_sock_proto proto
);
592 extern int lttcomm_create_sock(struct lttcomm_sock
*sock
);
593 extern struct lttcomm_sock
*lttcomm_alloc_sock_from_uri(struct lttng_uri
*uri
);
594 extern void lttcomm_destroy_sock(struct lttcomm_sock
*sock
);
595 extern struct lttcomm_sock
*lttcomm_alloc_copy_sock(struct lttcomm_sock
*src
);
596 extern void lttcomm_copy_sock(struct lttcomm_sock
*dst
,
597 struct lttcomm_sock
*src
);
599 /* Relayd socket object. */
600 extern struct lttcomm_relayd_sock
*lttcomm_alloc_relayd_sock(
601 struct lttng_uri
*uri
, uint32_t major
, uint32_t minor
);
603 extern int lttcomm_setsockopt_rcv_timeout(int sock
, unsigned int msec
);
604 extern int lttcomm_setsockopt_snd_timeout(int sock
, unsigned int msec
);
606 extern void lttcomm_init(void);
607 /* Get network timeout, in milliseconds */
608 extern unsigned long lttcomm_get_network_timeout(void);
610 #endif /* _LTTNG_SESSIOND_COMM_H */