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 <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_DISABLE_ALL_EVENT
= 4,
63 LTTNG_ENABLE_CHANNEL
= 5,
64 LTTNG_ENABLE_EVENT
= 6,
65 LTTNG_ENABLE_ALL_EVENT
= 7,
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,
94 enum lttcomm_relayd_command
{
95 RELAYD_ADD_STREAM
= 1,
96 RELAYD_CREATE_SESSION
= 2,
97 RELAYD_START_DATA
= 3,
98 RELAYD_UPDATE_SYNC_INFO
= 4,
100 RELAYD_SEND_METADATA
= 6,
101 RELAYD_CLOSE_STREAM
= 7,
102 RELAYD_DATA_PENDING
= 8,
103 RELAYD_QUIESCENT_CONTROL
= 9,
104 RELAYD_BEGIN_DATA_PENDING
= 10,
105 RELAYD_END_DATA_PENDING
= 11,
106 RELAYD_ADD_INDEX
= 12,
107 RELAYD_SEND_INDEX
= 13,
108 RELAYD_CLOSE_INDEX
= 14,
109 /* Live-reading commands (2.4+). */
110 RELAYD_LIST_SESSIONS
= 15,
111 /* All streams of the channel have been sent to the relayd (2.4+). */
112 RELAYD_STREAMS_SENT
= 16,
116 * lttcomm error code.
118 enum lttcomm_return_code
{
119 LTTCOMM_CONSUMERD_SUCCESS
= 0, /* Everything went fine. */
120 LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
= 1, /* Command socket ready */
121 LTTCOMM_CONSUMERD_SUCCESS_RECV_FD
, /* Success on receiving fds */
122 LTTCOMM_CONSUMERD_ERROR_RECV_FD
, /* Error on receiving fds */
123 LTTCOMM_CONSUMERD_ERROR_RECV_CMD
, /* Error on receiving command */
124 LTTCOMM_CONSUMERD_POLL_ERROR
, /* Error in polling thread */
125 LTTCOMM_CONSUMERD_POLL_NVAL
, /* Poll on closed fd */
126 LTTCOMM_CONSUMERD_POLL_HUP
, /* All fds have hungup */
127 LTTCOMM_CONSUMERD_EXIT_SUCCESS
, /* Consumerd exiting normally */
128 LTTCOMM_CONSUMERD_EXIT_FAILURE
, /* Consumerd exiting on error */
129 LTTCOMM_CONSUMERD_OUTFD_ERROR
, /* Error opening the tracefile */
130 LTTCOMM_CONSUMERD_SPLICE_EBADF
, /* EBADF from splice(2) */
131 LTTCOMM_CONSUMERD_SPLICE_EINVAL
, /* EINVAL from splice(2) */
132 LTTCOMM_CONSUMERD_SPLICE_ENOMEM
, /* ENOMEM from splice(2) */
133 LTTCOMM_CONSUMERD_SPLICE_ESPIPE
, /* ESPIPE from splice(2) */
134 LTTCOMM_CONSUMERD_ENOMEM
, /* Consumer is out of memory */
135 LTTCOMM_CONSUMERD_ERROR_METADATA
, /* Error with metadata. */
136 LTTCOMM_CONSUMERD_FATAL
, /* Fatal error. */
137 LTTCOMM_CONSUMERD_RELAYD_FAIL
, /* Error on remote relayd */
138 LTTCOMM_CONSUMERD_CHANNEL_FAIL
, /* Channel creation failed. */
140 /* MUST be last element */
141 LTTCOMM_NR
, /* Last element */
144 /* lttng socket protocol. */
145 enum lttcomm_sock_proto
{
151 * Index in the net_families array below. Please keep in sync!
153 enum lttcomm_sock_domain
{
158 enum lttcomm_metadata_command
{
159 LTTCOMM_METADATA_REQUEST
= 1,
163 * Commands sent from the consumerd to the sessiond to request if new metadata
164 * is available. This message is used to find the per UID _or_ per PID registry
165 * for the channel key. For per UID lookup, the triplet
166 * bits_per_long/uid/session_id is used. On lookup failure, we search for the
167 * per PID registry indexed by session id ignoring the other values.
169 struct lttcomm_metadata_request_msg
{
170 uint64_t session_id
; /* Tracing session id */
171 uint64_t session_id_per_pid
; /* Tracing session id for per-pid */
172 uint32_t bits_per_long
; /* Consumer ABI */
174 uint64_t key
; /* Metadata channel key. */
177 struct lttcomm_sockaddr
{
178 enum lttcomm_sock_domain type
;
180 struct sockaddr_in sin
;
181 struct sockaddr_in6 sin6
;
185 struct lttcomm_sock
{
187 enum lttcomm_sock_proto proto
;
188 struct lttcomm_sockaddr sockaddr
;
189 const struct lttcomm_proto_ops
*ops
;
193 * Relayd sock. Adds the protocol version to use for the communications with
196 struct lttcomm_relayd_sock
{
197 struct lttcomm_sock sock
;
202 struct lttcomm_net_family
{
204 int (*create
) (struct lttcomm_sock
*sock
, int type
, int proto
);
207 struct lttcomm_proto_ops
{
208 int (*bind
) (struct lttcomm_sock
*sock
);
209 int (*close
) (struct lttcomm_sock
*sock
);
210 int (*connect
) (struct lttcomm_sock
*sock
);
211 struct lttcomm_sock
*(*accept
) (struct lttcomm_sock
*sock
);
212 int (*listen
) (struct lttcomm_sock
*sock
, int backlog
);
213 ssize_t (*recvmsg
) (struct lttcomm_sock
*sock
, void *buf
, size_t len
,
215 ssize_t (*sendmsg
) (struct lttcomm_sock
*sock
, void *buf
, size_t len
,
220 * Data structure received from lttng client to session daemon.
222 struct lttcomm_session_msg
{
223 uint32_t cmd_type
; /* enum lttcomm_sessiond_command */
224 struct lttng_session session
;
225 struct lttng_domain domain
;
228 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
230 } LTTNG_PACKED disable
;
233 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
234 struct lttng_event event
;
235 /* Length of following filter expression. */
236 uint32_t expression_len
;
237 /* Length of following bytecode for filter. */
238 uint32_t bytecode_len
;
240 uint32_t exclusion_count
;
242 * After this structure, the following variable-length
243 * items are transmitted:
244 * - char exclusion_names[LTTNG_SYMBOL_NAME_LEN][exclusion_count]
245 * - unsigned char filter_expression[expression_len]
246 * - unsigned char filter_bytecode[bytecode_len]
248 } LTTNG_PACKED enable
;
251 struct lttng_channel chan
;
252 } LTTNG_PACKED channel
;
255 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
256 struct lttng_event_context ctx
;
257 } LTTNG_PACKED context
;
258 /* Use by register_consumer */
264 char channel_name
[LTTNG_SYMBOL_NAME_LEN
];
266 struct lttng_calibrate calibrate
;
267 /* Used by the set_consumer_url and used by create_session also call */
269 /* Number of lttng_uri following */
273 struct lttng_snapshot_output output
;
274 } LTTNG_PACKED snapshot_output
;
277 struct lttng_snapshot_output output
;
278 } LTTNG_PACKED snapshot_record
;
281 unsigned int timer_interval
; /* usec */
282 } LTTNG_PACKED session_live
;
286 #define LTTNG_FILTER_MAX_LEN 65536
289 * Filter bytecode data. The reloc table is located at the end of the
290 * bytecode. It is made of tuples: (uint16_t, var. len. string). It
291 * starts at reloc_table_offset.
293 #define LTTNG_FILTER_PADDING 32
294 struct lttng_filter_bytecode
{
295 uint32_t len
; /* len of data */
296 uint32_t reloc_table_offset
;
298 char padding
[LTTNG_FILTER_PADDING
];
303 * Event exclusion data. At the end of the structure, there will actually
304 * by zero or more names, where the actual number of names is given by
305 * the 'count' item of the structure.
307 #define LTTNG_EVENT_EXCLUSION_PADDING 32
308 struct lttng_event_exclusion
{
310 char padding
[LTTNG_EVENT_EXCLUSION_PADDING
];
311 char names
[LTTNG_SYMBOL_NAME_LEN
][0];
315 * Data structure for the response from sessiond to the lttng client.
317 struct lttcomm_lttng_msg
{
318 uint32_t cmd_type
; /* enum lttcomm_sessiond_command */
319 uint32_t ret_code
; /* enum lttcomm_return_code */
320 uint32_t pid
; /* pid_t */
322 /* Contains: trace_name + data */
326 struct lttcomm_lttng_output_id
{
331 * lttcomm_consumer_msg is the message sent from sessiond to consumerd
332 * to either add a channel, add a stream, update a stream, or stop
335 struct lttcomm_consumer_msg
{
336 uint32_t cmd_type
; /* enum consumerd_command */
339 uint64_t channel_key
;
341 char pathname
[PATH_MAX
];
345 /* nb_init_streams is the number of streams open initially. */
346 uint32_t nb_init_streams
;
347 char name
[LTTNG_SYMBOL_NAME_LEN
];
348 /* Use splice or mmap to consume this fd */
349 enum lttng_event_output output
;
350 int type
; /* Per cpu or metadata. */
351 uint64_t tracefile_size
; /* bytes */
352 uint32_t tracefile_count
; /* number of tracefiles */
353 /* If the channel's streams have to be monitored or not. */
355 /* timer to check the streams usage in live mode (usec). */
356 unsigned int live_timer_interval
;
357 } LTTNG_PACKED channel
; /* Only used by Kernel. */
360 uint64_t channel_key
;
361 int32_t cpu
; /* On which CPU this stream is assigned. */
362 /* Tells the consumer if the stream should be or not monitored. */
364 } LTTNG_PACKED stream
; /* Only used by Kernel. */
367 enum lttng_stream_type type
;
368 /* Open socket to the relayd */
369 struct lttcomm_relayd_sock sock
;
370 /* Tracing session id associated to the relayd. */
372 /* Relayd session id, only used with control socket. */
373 uint64_t relayd_session_id
;
374 } LTTNG_PACKED relayd_sock
;
376 uint64_t net_seq_idx
;
377 } LTTNG_PACKED destroy_relayd
;
380 } LTTNG_PACKED data_pending
;
382 uint64_t subbuf_size
; /* bytes */
383 uint64_t num_subbuf
; /* power of 2 */
384 int32_t overwrite
; /* 1: overwrite, 0: discard */
385 uint32_t switch_timer_interval
; /* usec */
386 uint32_t read_timer_interval
; /* usec */
387 unsigned int live_timer_interval
; /* usec */
388 int32_t output
; /* splice, mmap */
389 int32_t type
; /* metadata or per_cpu */
390 uint64_t session_id
; /* Tracing session id */
391 char pathname
[PATH_MAX
]; /* Channel file path. */
392 char name
[LTTNG_SYMBOL_NAME_LEN
]; /* Channel name. */
393 uint32_t uid
; /* User ID of the session */
394 uint32_t gid
; /* Group ID ot the session */
395 uint64_t relayd_id
; /* Relayd id if apply. */
396 uint64_t key
; /* Unique channel key. */
397 unsigned char uuid
[UUID_LEN
]; /* uuid for ust tracer. */
398 uint32_t chan_id
; /* Channel ID on the tracer side. */
399 uint64_t tracefile_size
; /* bytes */
400 uint32_t tracefile_count
; /* number of tracefiles */
401 uint64_t session_id_per_pid
; /* Per-pid session ID. */
402 /* Tells the consumer if the stream should be or not monitored. */
405 * For UST per UID buffers, this is the application UID of the
406 * channel. This can be different from the user UID requesting the
407 * channel creation and used for the rights on the stream file
408 * because the application can be in the tracing for instance.
410 uint32_t ust_app_uid
;
411 } LTTNG_PACKED ask_channel
;
414 } LTTNG_PACKED get_channel
;
417 } LTTNG_PACKED destroy_channel
;
419 uint64_t key
; /* Metadata channel key. */
420 uint64_t target_offset
; /* Offset in the consumer */
421 uint64_t len
; /* Length of metadata to be received. */
422 } LTTNG_PACKED push_metadata
;
424 uint64_t key
; /* Metadata channel key. */
425 } LTTNG_PACKED close_metadata
;
427 uint64_t key
; /* Metadata channel key. */
428 } LTTNG_PACKED setup_metadata
;
430 uint64_t key
; /* Channel key. */
431 } LTTNG_PACKED flush_channel
;
433 char pathname
[PATH_MAX
];
434 /* Indicate if the snapshot goes on the relayd or locally. */
436 uint32_t metadata
; /* This a metadata snapshot. */
437 uint64_t relayd_id
; /* Relayd id if apply. */
439 uint64_t max_stream_size
;
440 } LTTNG_PACKED snapshot_channel
;
442 uint64_t channel_key
;
443 uint64_t net_seq_idx
;
444 } LTTNG_PACKED sent_streams
;
449 * Status message returned to the sessiond after a received command.
451 struct lttcomm_consumer_status_msg
{
452 enum lttcomm_return_code ret_code
;
455 struct lttcomm_consumer_status_channel
{
456 enum lttcomm_return_code ret_code
;
458 unsigned int stream_count
;
461 #ifdef HAVE_LIBLTTNG_UST_CTL
463 #include <lttng/ust-abi.h>
466 * Data structure for the commands sent from sessiond to UST.
468 struct lttcomm_ust_msg
{
472 struct lttng_ust_channel channel
;
473 struct lttng_ust_stream stream
;
474 struct lttng_ust_event event
;
475 struct lttng_ust_context context
;
476 struct lttng_ust_tracer_version version
;
481 * Data structure for the response from UST to the session daemon.
482 * cmd_type is sent back in the reply for validation.
484 struct lttcomm_ust_reply
{
487 uint32_t ret_code
; /* enum lttcomm_return_code */
488 uint32_t ret_val
; /* return value */
491 uint64_t memory_map_size
;
492 } LTTNG_PACKED channel
;
494 uint64_t memory_map_size
;
495 } LTTNG_PACKED stream
;
496 struct lttng_ust_tracer_version version
;
500 #endif /* HAVE_LIBLTTNG_UST_CTL */
502 extern const char *lttcomm_get_readable_code(enum lttcomm_return_code code
);
504 extern int lttcomm_init_inet_sockaddr(struct lttcomm_sockaddr
*sockaddr
,
505 const char *ip
, unsigned int port
);
506 extern int lttcomm_init_inet6_sockaddr(struct lttcomm_sockaddr
*sockaddr
,
507 const char *ip
, unsigned int port
);
509 extern struct lttcomm_sock
*lttcomm_alloc_sock(enum lttcomm_sock_proto proto
);
510 extern int lttcomm_create_sock(struct lttcomm_sock
*sock
);
511 extern struct lttcomm_sock
*lttcomm_alloc_sock_from_uri(struct lttng_uri
*uri
);
512 extern void lttcomm_destroy_sock(struct lttcomm_sock
*sock
);
513 extern struct lttcomm_sock
*lttcomm_alloc_copy_sock(struct lttcomm_sock
*src
);
514 extern void lttcomm_copy_sock(struct lttcomm_sock
*dst
,
515 struct lttcomm_sock
*src
);
517 /* Relayd socket object. */
518 extern struct lttcomm_relayd_sock
*lttcomm_alloc_relayd_sock(
519 struct lttng_uri
*uri
, uint32_t major
, uint32_t minor
);
521 extern int lttcomm_setsockopt_rcv_timeout(int sock
, unsigned int msec
);
522 extern int lttcomm_setsockopt_snd_timeout(int sock
, unsigned int msec
);
524 extern void lttcomm_init(void);
525 /* Get network timeout, in milliseconds */
526 extern unsigned long lttcomm_get_network_timeout(void);
528 #endif /* _LTTNG_SESSIOND_COMM_H */