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 <common/compat/socket.h>
35 #include <common/uri.h>
36 #include <common/defaults.h>
37 #include <common/compat/uuid.h>
39 #include <arpa/inet.h>
40 #include <netinet/in.h>
45 #include <common/unix.h>
47 /* Queue size of listen(2) */
48 #define LTTNG_SESSIOND_COMM_MAX_LISTEN 64
50 /* Maximum number of FDs that can be sent over a Unix socket */
51 #define LTTCOMM_MAX_SEND_FDS 4
54 * Get the error code index from 0 since LTTCOMM_OK start at 1000
56 #define LTTCOMM_ERR_INDEX(code) (code - LTTCOMM_CONSUMERD_COMMAND_SOCK_READY)
58 enum lttcomm_sessiond_command
{
60 LTTNG_ADD_CONTEXT
= 0,
61 /* LTTNG_CALIBRATE used to be here */
62 LTTNG_DISABLE_CHANNEL
= 2,
63 LTTNG_DISABLE_EVENT
= 3,
64 LTTNG_LIST_SYSCALLS
= 4,
65 LTTNG_ENABLE_CHANNEL
= 5,
66 LTTNG_ENABLE_EVENT
= 6,
68 /* Session daemon command */
69 LTTNG_CREATE_SESSION
= 8,
70 LTTNG_DESTROY_SESSION
= 9,
71 LTTNG_LIST_CHANNELS
= 10,
72 LTTNG_LIST_DOMAINS
= 11,
73 LTTNG_LIST_EVENTS
= 12,
74 LTTNG_LIST_SESSIONS
= 13,
75 LTTNG_LIST_TRACEPOINTS
= 14,
76 LTTNG_REGISTER_CONSUMER
= 15,
77 LTTNG_START_TRACE
= 16,
78 LTTNG_STOP_TRACE
= 17,
79 LTTNG_LIST_TRACEPOINT_FIELDS
= 18,
82 LTTNG_DISABLE_CONSUMER
= 19,
83 LTTNG_ENABLE_CONSUMER
= 20,
84 LTTNG_SET_CONSUMER_URI
= 21,
87 LTTNG_DATA_PENDING
= 24,
88 LTTNG_SNAPSHOT_ADD_OUTPUT
= 25,
89 LTTNG_SNAPSHOT_DEL_OUTPUT
= 26,
90 LTTNG_SNAPSHOT_LIST_OUTPUT
= 27,
91 LTTNG_SNAPSHOT_RECORD
= 28,
92 LTTNG_CREATE_SESSION_SNAPSHOT
= 29,
93 LTTNG_CREATE_SESSION_LIVE
= 30,
94 LTTNG_SAVE_SESSION
= 31,
96 LTTNG_UNTRACK_PID
= 33,
97 LTTNG_LIST_TRACKER_PIDS
= 34,
98 LTTNG_SET_SESSION_SHM_PATH
= 40,
99 LTTNG_REGENERATE_METADATA
= 41,
100 LTTNG_REGENERATE_STATEDUMP
= 42,
101 LTTNG_REGISTER_TRIGGER
= 43,
102 LTTNG_UNREGISTER_TRIGGER
= 44,
105 enum lttcomm_relayd_command
{
106 RELAYD_ADD_STREAM
= 1,
107 RELAYD_CREATE_SESSION
= 2,
108 RELAYD_START_DATA
= 3,
109 RELAYD_UPDATE_SYNC_INFO
= 4,
111 RELAYD_SEND_METADATA
= 6,
112 RELAYD_CLOSE_STREAM
= 7,
113 RELAYD_DATA_PENDING
= 8,
114 RELAYD_QUIESCENT_CONTROL
= 9,
115 RELAYD_BEGIN_DATA_PENDING
= 10,
116 RELAYD_END_DATA_PENDING
= 11,
117 RELAYD_ADD_INDEX
= 12,
118 RELAYD_SEND_INDEX
= 13,
119 RELAYD_CLOSE_INDEX
= 14,
120 /* Live-reading commands (2.4+). */
121 RELAYD_LIST_SESSIONS
= 15,
122 /* All streams of the channel have been sent to the relayd (2.4+). */
123 RELAYD_STREAMS_SENT
= 16,
124 /* Ask the relay to reset the metadata trace file (2.8+) */
125 RELAYD_RESET_METADATA
= 17,
126 /* Rename a chunk after the rotation is completed (2.11+) */
127 RELAYD_ROTATE_RENAME
= 19,
128 /* Create a folder on the relayd FS (2.11+) */
133 * lttcomm error code.
135 enum lttcomm_return_code
{
136 LTTCOMM_CONSUMERD_SUCCESS
= 0, /* Everything went fine. */
137 LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
= 1, /* Command socket ready */
138 LTTCOMM_CONSUMERD_SUCCESS_RECV_FD
, /* Success on receiving fds */
139 LTTCOMM_CONSUMERD_ERROR_RECV_FD
, /* Error on receiving fds */
140 LTTCOMM_CONSUMERD_ERROR_RECV_CMD
, /* Error on receiving command */
141 LTTCOMM_CONSUMERD_POLL_ERROR
, /* Error in polling thread */
142 LTTCOMM_CONSUMERD_POLL_NVAL
, /* Poll on closed fd */
143 LTTCOMM_CONSUMERD_POLL_HUP
, /* All fds have hungup */
144 LTTCOMM_CONSUMERD_EXIT_SUCCESS
, /* Consumerd exiting normally */
145 LTTCOMM_CONSUMERD_EXIT_FAILURE
, /* Consumerd exiting on error */
146 LTTCOMM_CONSUMERD_OUTFD_ERROR
, /* Error opening the tracefile */
147 LTTCOMM_CONSUMERD_SPLICE_EBADF
, /* EBADF from splice(2) */
148 LTTCOMM_CONSUMERD_SPLICE_EINVAL
, /* EINVAL from splice(2) */
149 LTTCOMM_CONSUMERD_SPLICE_ENOMEM
, /* ENOMEM from splice(2) */
150 LTTCOMM_CONSUMERD_SPLICE_ESPIPE
, /* ESPIPE from splice(2) */
151 LTTCOMM_CONSUMERD_ENOMEM
, /* Consumer is out of memory */
152 LTTCOMM_CONSUMERD_ERROR_METADATA
, /* Error with metadata. */
153 LTTCOMM_CONSUMERD_FATAL
, /* Fatal error. */
154 LTTCOMM_CONSUMERD_RELAYD_FAIL
, /* Error on remote relayd */
155 LTTCOMM_CONSUMERD_CHANNEL_FAIL
, /* Channel creation failed. */
156 LTTCOMM_CONSUMERD_CHAN_NOT_FOUND
, /* Channel not found. */
157 LTTCOMM_CONSUMERD_ALREADY_SET
, /* Resource already set. */
159 /* MUST be last element */
160 LTTCOMM_NR
, /* Last element */
163 /* lttng socket protocol. */
164 enum lttcomm_sock_proto
{
170 * Index in the net_families array below. Please keep in sync!
172 enum lttcomm_sock_domain
{
177 enum lttcomm_metadata_command
{
178 LTTCOMM_METADATA_REQUEST
= 1,
182 * Commands sent from the consumerd to the sessiond to request if new metadata
183 * is available. This message is used to find the per UID _or_ per PID registry
184 * for the channel key. For per UID lookup, the triplet
185 * bits_per_long/uid/session_id is used. On lookup failure, we search for the
186 * per PID registry indexed by session id ignoring the other values.
188 struct lttcomm_metadata_request_msg
{
189 uint64_t session_id
; /* Tracing session id */
190 uint64_t session_id_per_pid
; /* Tracing session id for per-pid */
191 uint32_t bits_per_long
; /* Consumer ABI */
193 uint64_t key
; /* Metadata channel key. */
196 struct lttcomm_sockaddr
{
197 enum lttcomm_sock_domain type
;
199 struct sockaddr_in sin
;
200 struct sockaddr_in6 sin6
;
204 struct lttcomm_sock
{
206 enum lttcomm_sock_proto proto
;
207 struct lttcomm_sockaddr sockaddr
;
208 const struct lttcomm_proto_ops
*ops
;
212 * Relayd sock. Adds the protocol version to use for the communications with
215 struct lttcomm_relayd_sock
{
216 struct lttcomm_sock sock
;
221 struct lttcomm_net_family
{
223 int (*create
) (struct lttcomm_sock
*sock
, int type
, int proto
);
226 struct lttcomm_proto_ops
{
227 int (*bind
) (struct lttcomm_sock
*sock
);
228 int (*close
) (struct lttcomm_sock
*sock
);
229 int (*connect
) (struct lttcomm_sock
*sock
);
230 struct lttcomm_sock
*(*accept
) (struct lttcomm_sock
*sock
);
231 int (*listen
) (struct lttcomm_sock
*sock
, int backlog
);
232 ssize_t (*recvmsg
) (struct lttcomm_sock
*sock
, void *buf
, size_t len
,
234 ssize_t (*sendmsg
) (struct lttcomm_sock
*sock
, const void *buf
,
235 size_t len
, int flags
);
239 * Data structure received from lttng client to session daemon.
241 struct lttcomm_session_msg
{
242 uint32_t cmd_type
; /* enum lttcomm_sessiond_command */
243 struct lttng_session session
;
244 struct lttng_domain domain
;
248 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
249 struct lttng_event event LTTNG_PACKED
;
250 /* Length of following filter expression. */
251 uint32_t expression_len
;
252 /* Length of following bytecode for filter. */
253 uint32_t bytecode_len
;
255 uint32_t exclusion_count
;
257 * After this structure, the following variable-length
258 * items are transmitted:
259 * - char exclusion_names[LTTNG_SYMBOL_NAME_LEN][exclusion_count]
260 * - unsigned char filter_expression[expression_len]
261 * - unsigned char filter_bytecode[bytecode_len]
263 } LTTNG_PACKED enable
;
265 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
266 struct lttng_event event LTTNG_PACKED
;
267 /* Length of following filter expression. */
268 uint32_t expression_len
;
269 /* Length of following bytecode for filter. */
270 uint32_t bytecode_len
;
272 * After this structure, the following variable-length
273 * items are transmitted:
274 * - unsigned char filter_expression[expression_len]
275 * - unsigned char filter_bytecode[bytecode_len]
277 } LTTNG_PACKED disable
;
280 struct lttng_channel chan LTTNG_PACKED
;
281 /* struct lttng_channel_extended is already packed. */
282 struct lttng_channel_extended extended
;
283 } LTTNG_PACKED channel
;
286 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
287 struct lttng_event_context ctx LTTNG_PACKED
;
288 uint32_t provider_name_len
;
289 uint32_t context_name_len
;
290 } LTTNG_PACKED context
;
291 /* Use by register_consumer */
297 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
299 struct lttng_calibrate calibrate
;
300 /* Used by the set_consumer_url and used by create_session also call */
302 /* Number of lttng_uri following */
306 struct lttng_snapshot_output output LTTNG_PACKED
;
307 } LTTNG_PACKED snapshot_output
;
310 struct lttng_snapshot_output output LTTNG_PACKED
;
311 } LTTNG_PACKED snapshot_record
;
314 unsigned int timer_interval
; /* usec */
315 } LTTNG_PACKED session_live
;
317 struct lttng_save_session_attr attr
; /* struct already packed */
318 } LTTNG_PACKED save_session
;
320 char shm_path
[PATH_MAX
];
321 } LTTNG_PACKED set_shm_path
;
324 } LTTNG_PACKED pid_tracker
;
327 } LTTNG_PACKED trigger
;
331 #define LTTNG_FILTER_MAX_LEN 65536
334 * Filter bytecode data. The reloc table is located at the end of the
335 * bytecode. It is made of tuples: (uint16_t, var. len. string). It
336 * starts at reloc_table_offset.
338 #define LTTNG_FILTER_PADDING 32
339 struct lttng_filter_bytecode
{
340 uint32_t len
; /* len of data */
341 uint32_t reloc_table_offset
;
343 char padding
[LTTNG_FILTER_PADDING
];
348 * Event exclusion data. At the end of the structure, there will actually
349 * by zero or more names, where the actual number of names is given by
350 * the 'count' item of the structure.
352 #define LTTNG_EVENT_EXCLUSION_PADDING 32
353 struct lttng_event_exclusion
{
355 char padding
[LTTNG_EVENT_EXCLUSION_PADDING
];
356 char names
[0][LTTNG_SYMBOL_NAME_LEN
];
359 #define LTTNG_EVENT_EXCLUSION_NAME_AT(_exclusion, _i) \
360 (&(_exclusion)->names[_i][0])
363 * Event command header.
365 struct lttcomm_event_command_header
{
366 /* Number of events */
371 * Event extended info header. This is the structure preceding each
372 * extended info data.
374 struct lttcomm_event_extended_header
{
376 * Size of filter string immediately following this header.
377 * This size includes the terminal null character.
382 * Number of exclusion names, immediately following the filter
383 * string. Each exclusion name has a fixed length of
384 * LTTNG_SYMBOL_NAME_LEN bytes, including the terminal null
387 uint32_t nb_exclusions
;
391 * Data structure for the response from sessiond to the lttng client.
393 struct lttcomm_lttng_msg
{
394 uint32_t cmd_type
; /* enum lttcomm_sessiond_command */
395 uint32_t ret_code
; /* enum lttcomm_return_code */
396 uint32_t pid
; /* pid_t */
397 uint32_t cmd_header_size
;
401 struct lttcomm_lttng_output_id
{
406 * lttcomm_consumer_msg is the message sent from sessiond to consumerd
407 * to either add a channel, add a stream, update a stream, or stop
410 struct lttcomm_consumer_msg
{
411 uint32_t cmd_type
; /* enum consumerd_command */
414 uint64_t channel_key
;
416 char pathname
[PATH_MAX
];
420 /* nb_init_streams is the number of streams open initially. */
421 uint32_t nb_init_streams
;
422 char name
[LTTNG_SYMBOL_NAME_LEN
];
423 /* Use splice or mmap to consume this fd */
424 enum lttng_event_output output
;
425 int type
; /* Per cpu or metadata. */
426 uint64_t tracefile_size
; /* bytes */
427 uint32_t tracefile_count
; /* number of tracefiles */
428 /* If the channel's streams have to be monitored or not. */
430 /* timer to check the streams usage in live mode (usec). */
431 unsigned int live_timer_interval
;
432 /* timer to sample a channel's positions (usec). */
433 unsigned int monitor_timer_interval
;
434 } LTTNG_PACKED channel
; /* Only used by Kernel. */
437 uint64_t channel_key
;
438 int32_t cpu
; /* On which CPU this stream is assigned. */
439 /* Tells the consumer if the stream should be or not monitored. */
441 } LTTNG_PACKED stream
; /* Only used by Kernel. */
444 enum lttng_stream_type type
;
445 /* Open socket to the relayd */
446 struct lttcomm_relayd_sock sock
;
447 /* Tracing session id associated to the relayd. */
449 /* Relayd session id, only used with control socket. */
450 uint64_t relayd_session_id
;
451 } LTTNG_PACKED relayd_sock
;
453 uint64_t net_seq_idx
;
454 } LTTNG_PACKED destroy_relayd
;
457 } LTTNG_PACKED data_pending
;
459 uint64_t subbuf_size
; /* bytes */
460 uint64_t num_subbuf
; /* power of 2 */
461 int32_t overwrite
; /* 1: overwrite, 0: discard */
462 uint32_t switch_timer_interval
; /* usec */
463 uint32_t read_timer_interval
; /* usec */
464 unsigned int live_timer_interval
; /* usec */
465 uint32_t monitor_timer_interval
; /* usec */
466 int32_t output
; /* splice, mmap */
467 int32_t type
; /* metadata or per_cpu */
468 uint64_t session_id
; /* Tracing session id */
469 char pathname
[PATH_MAX
]; /* Channel file path. */
470 char name
[LTTNG_SYMBOL_NAME_LEN
]; /* Channel name. */
471 uint32_t uid
; /* User ID of the session */
472 uint32_t gid
; /* Group ID ot the session */
473 uint64_t relayd_id
; /* Relayd id if apply. */
474 uint64_t key
; /* Unique channel key. */
475 unsigned char uuid
[UUID_LEN
]; /* uuid for ust tracer. */
476 uint32_t chan_id
; /* Channel ID on the tracer side. */
477 uint64_t tracefile_size
; /* bytes */
478 uint32_t tracefile_count
; /* number of tracefiles */
479 uint64_t session_id_per_pid
; /* Per-pid session ID. */
480 /* Tells the consumer if the stream should be or not monitored. */
483 * For UST per UID buffers, this is the application UID of the
484 * channel. This can be different from the user UID requesting the
485 * channel creation and used for the rights on the stream file
486 * because the application can be in the tracing for instance.
488 uint32_t ust_app_uid
;
489 int64_t blocking_timeout
;
490 char root_shm_path
[PATH_MAX
];
491 char shm_path
[PATH_MAX
];
492 } LTTNG_PACKED ask_channel
;
495 } LTTNG_PACKED get_channel
;
498 } LTTNG_PACKED destroy_channel
;
500 uint64_t key
; /* Metadata channel key. */
501 uint64_t target_offset
; /* Offset in the consumer */
502 uint64_t len
; /* Length of metadata to be received. */
503 uint64_t version
; /* Version of the metadata. */
504 } LTTNG_PACKED push_metadata
;
506 uint64_t key
; /* Metadata channel key. */
507 } LTTNG_PACKED close_metadata
;
509 uint64_t key
; /* Metadata channel key. */
510 } LTTNG_PACKED setup_metadata
;
512 uint64_t key
; /* Channel key. */
513 } LTTNG_PACKED flush_channel
;
515 uint64_t key
; /* Channel key. */
516 } LTTNG_PACKED clear_quiescent_channel
;
518 char pathname
[PATH_MAX
];
519 /* Indicate if the snapshot goes on the relayd or locally. */
521 uint32_t metadata
; /* This a metadata snapshot. */
522 uint64_t relayd_id
; /* Relayd id if apply. */
524 uint64_t nb_packets_per_stream
;
525 } LTTNG_PACKED snapshot_channel
;
527 uint64_t channel_key
;
528 uint64_t net_seq_idx
;
529 } LTTNG_PACKED sent_streams
;
532 uint64_t channel_key
;
533 } LTTNG_PACKED discarded_events
;
536 uint64_t channel_key
;
537 } LTTNG_PACKED lost_packets
;
540 } LTTNG_PACKED regenerate_metadata
;
542 char old_path
[LTTNG_PATH_MAX
];
543 char new_path
[LTTNG_PATH_MAX
];
544 uint64_t relayd_id
; /* Relayd id if apply. */
548 } LTTNG_PACKED rotate_rename
;
550 char path
[LTTNG_PATH_MAX
];
551 uint64_t relayd_id
; /* Relayd id if apply. */
555 } LTTNG_PACKED mkdir
;
560 * Channel monitoring message returned to the session daemon on every
561 * monitor timer expiration.
563 struct lttcomm_consumer_channel_monitor_msg
{
564 /* Key of the sampled channel. */
567 * Lowest and highest usage (bytes) at the moment the sample was taken.
569 uint64_t lowest
, highest
;
573 * Status message returned to the sessiond after a received command.
575 struct lttcomm_consumer_status_msg
{
576 enum lttcomm_return_code ret_code
;
579 struct lttcomm_consumer_status_channel
{
580 enum lttcomm_return_code ret_code
;
582 unsigned int stream_count
;
585 #ifdef HAVE_LIBLTTNG_UST_CTL
587 #include <lttng/ust-abi.h>
590 * Data structure for the commands sent from sessiond to UST.
592 struct lttcomm_ust_msg
{
596 struct lttng_ust_channel channel
;
597 struct lttng_ust_stream stream
;
598 struct lttng_ust_event event
;
599 struct lttng_ust_context context
;
600 struct lttng_ust_tracer_version version
;
605 * Data structure for the response from UST to the session daemon.
606 * cmd_type is sent back in the reply for validation.
608 struct lttcomm_ust_reply
{
611 uint32_t ret_code
; /* enum lttcomm_return_code */
612 uint32_t ret_val
; /* return value */
615 uint64_t memory_map_size
;
616 } LTTNG_PACKED channel
;
618 uint64_t memory_map_size
;
619 } LTTNG_PACKED stream
;
620 struct lttng_ust_tracer_version version
;
624 #endif /* HAVE_LIBLTTNG_UST_CTL */
626 extern const char *lttcomm_get_readable_code(enum lttcomm_return_code code
);
628 extern int lttcomm_init_inet_sockaddr(struct lttcomm_sockaddr
*sockaddr
,
629 const char *ip
, unsigned int port
);
630 extern int lttcomm_init_inet6_sockaddr(struct lttcomm_sockaddr
*sockaddr
,
631 const char *ip
, unsigned int port
);
633 extern struct lttcomm_sock
*lttcomm_alloc_sock(enum lttcomm_sock_proto proto
);
634 extern int lttcomm_create_sock(struct lttcomm_sock
*sock
);
635 extern struct lttcomm_sock
*lttcomm_alloc_sock_from_uri(struct lttng_uri
*uri
);
636 extern void lttcomm_destroy_sock(struct lttcomm_sock
*sock
);
637 extern struct lttcomm_sock
*lttcomm_alloc_copy_sock(struct lttcomm_sock
*src
);
638 extern void lttcomm_copy_sock(struct lttcomm_sock
*dst
,
639 struct lttcomm_sock
*src
);
641 /* Relayd socket object. */
642 extern struct lttcomm_relayd_sock
*lttcomm_alloc_relayd_sock(
643 struct lttng_uri
*uri
, uint32_t major
, uint32_t minor
);
645 extern int lttcomm_setsockopt_rcv_timeout(int sock
, unsigned int msec
);
646 extern int lttcomm_setsockopt_snd_timeout(int sock
, unsigned int msec
);
648 extern void lttcomm_init(void);
649 /* Get network timeout, in milliseconds */
650 extern unsigned long lttcomm_get_network_timeout(void);
652 #endif /* _LTTNG_SESSIOND_COMM_H */