Fix: missing reset when listing UST fields for multiple PIDs
[lttng-tools.git] / src / common / sessiond-comm / sessiond-comm.h
CommitLineData
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Julien Desfossez <julien.desfossez@polymtl.ca>
773168b7 4 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 5 *
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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.
fac6795d 9 *
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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
d14d33bf 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
990570ed 13 * more details.
fac6795d 14 *
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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.
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18 */
19
773168b7 20/*
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21 * This header is meant for liblttng and libust internal use ONLY. These
22 * declarations should NOT be considered stable API.
773168b7 23 */
fac6795d 24
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25#ifndef _LTTNG_SESSIOND_COMM_H
26#define _LTTNG_SESSIOND_COMM_H
27
d19d9ada 28#define _GNU_SOURCE
fac6795d 29#include <limits.h>
f3ed775e 30#include <lttng/lttng.h>
da3c9ec1 31#include <lttng/snapshot-internal.h>
b17231c6 32#include <common/compat/socket.h>
a4b92340 33#include <common/uri.h>
ce2a9e76 34#include <common/defaults.h>
ffe60014 35#include <common/compat/uuid.h>
5e16da05 36
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37#include <arpa/inet.h>
38#include <netinet/in.h>
39#include <sys/un.h>
40
41#include "inet.h"
42#include "inet6.h"
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43#include "unix.h"
44
fac6795d 45/* Queue size of listen(2) */
f158a754 46#define LTTNG_SESSIOND_COMM_MAX_LISTEN 64
fac6795d 47
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48/* Maximum number of FDs that can be sent over a Unix socket */
49#define LTTCOMM_MAX_SEND_FDS 4
50
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51/*
52 * Get the error code index from 0 since LTTCOMM_OK start at 1000
fac6795d 53 */
f73fabfd 54#define LTTCOMM_ERR_INDEX(code) (code - LTTCOMM_CONSUMERD_COMMAND_SOCK_READY)
fac6795d 55
6abb15de 56enum lttcomm_sessiond_command {
0d0c377a 57 /* Tracer command */
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58 LTTNG_ADD_CONTEXT = 0,
59 LTTNG_CALIBRATE = 1,
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,
0d0c377a 66 /* Session daemon command */
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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,
53a80697 78
de5e9086 79 /* Consumer */
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80 LTTNG_DISABLE_CONSUMER = 19,
81 LTTNG_ENABLE_CONSUMER = 20,
82 LTTNG_SET_CONSUMER_URI = 21,
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83 /* 22 */
84 /* 23 */
7c9534d6 85 LTTNG_DATA_PENDING = 24,
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86 LTTNG_SNAPSHOT_ADD_OUTPUT = 25,
87 LTTNG_SNAPSHOT_DEL_OUTPUT = 26,
88 LTTNG_SNAPSHOT_LIST_OUTPUT = 27,
89 LTTNG_SNAPSHOT_RECORD = 28,
27babd3a 90 LTTNG_CREATE_SESSION_SNAPSHOT = 29,
ecc48a90 91 LTTNG_CREATE_SESSION_LIVE = 30,
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92};
93
94enum lttcomm_relayd_command {
95 RELAYD_ADD_STREAM = 1,
96 RELAYD_CREATE_SESSION = 2,
97 RELAYD_START_DATA = 3,
98 RELAYD_UPDATE_SYNC_INFO = 4,
99 RELAYD_VERSION = 5,
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,
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106 RELAYD_ADD_INDEX = 12,
107 RELAYD_SEND_INDEX = 13,
108 RELAYD_CLOSE_INDEX = 14,
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109 /* Live-reading commands. */
110 RELAYD_LIST_SESSIONS = 15,
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111};
112
113/*
114 * lttcomm error code.
115 */
116enum lttcomm_return_code {
0c759fc9 117 LTTCOMM_CONSUMERD_SUCCESS = 0, /* Everything went fine. */
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118 LTTCOMM_CONSUMERD_COMMAND_SOCK_READY = 1, /* Command socket ready */
119 LTTCOMM_CONSUMERD_SUCCESS_RECV_FD, /* Success on receiving fds */
120 LTTCOMM_CONSUMERD_ERROR_RECV_FD, /* Error on receiving fds */
121 LTTCOMM_CONSUMERD_ERROR_RECV_CMD, /* Error on receiving command */
122 LTTCOMM_CONSUMERD_POLL_ERROR, /* Error in polling thread */
123 LTTCOMM_CONSUMERD_POLL_NVAL, /* Poll on closed fd */
124 LTTCOMM_CONSUMERD_POLL_HUP, /* All fds have hungup */
125 LTTCOMM_CONSUMERD_EXIT_SUCCESS, /* Consumerd exiting normally */
126 LTTCOMM_CONSUMERD_EXIT_FAILURE, /* Consumerd exiting on error */
127 LTTCOMM_CONSUMERD_OUTFD_ERROR, /* Error opening the tracefile */
128 LTTCOMM_CONSUMERD_SPLICE_EBADF, /* EBADF from splice(2) */
129 LTTCOMM_CONSUMERD_SPLICE_EINVAL, /* EINVAL from splice(2) */
130 LTTCOMM_CONSUMERD_SPLICE_ENOMEM, /* ENOMEM from splice(2) */
131 LTTCOMM_CONSUMERD_SPLICE_ESPIPE, /* ESPIPE from splice(2) */
ffe60014 132 LTTCOMM_CONSUMERD_ENOMEM, /* Consumer is out of memory */
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133 LTTCOMM_CONSUMERD_ERROR_METADATA, /* Error with metadata. */
134 LTTCOMM_CONSUMERD_FATAL, /* Fatal error. */
618a6a28 135 LTTCOMM_CONSUMERD_RELAYD_FAIL, /* Error on remote relayd */
0c759fc9 136 LTTCOMM_CONSUMERD_CHANNEL_FAIL, /* Channel creation failed. */
80e327fa 137
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138 /* MUST be last element */
139 LTTCOMM_NR, /* Last element */
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140};
141
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142/* lttng socket protocol. */
143enum lttcomm_sock_proto {
144 LTTCOMM_SOCK_UDP,
145 LTTCOMM_SOCK_TCP,
146};
147
148/*
149 * Index in the net_families array below. Please keep in sync!
150 */
151enum lttcomm_sock_domain {
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152 LTTCOMM_INET = 0,
153 LTTCOMM_INET6 = 1,
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154};
155
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156enum lttcomm_metadata_command {
157 LTTCOMM_METADATA_REQUEST = 1,
158};
159
160/*
161 * Commands sent from the consumerd to the sessiond to request if new metadata
162 * is available. This message is used to find the per UID _or_ per PID registry
163 * for the channel key. For per UID lookup, the triplet
164 * bits_per_long/uid/session_id is used. On lookup failure, we search for the
165 * per PID registry indexed by session id ignoring the other values.
166 */
167struct lttcomm_metadata_request_msg {
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168 uint64_t session_id; /* Tracing session id */
169 uint64_t session_id_per_pid; /* Tracing session id for per-pid */
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170 uint32_t bits_per_long; /* Consumer ABI */
171 uint32_t uid;
172 uint64_t key; /* Metadata channel key. */
173} LTTNG_PACKED;
174
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175struct lttcomm_sockaddr {
176 enum lttcomm_sock_domain type;
177 union {
178 struct sockaddr_in sin;
179 struct sockaddr_in6 sin6;
180 } addr;
fc5e05b7 181} LTTNG_PACKED;
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182
183struct lttcomm_sock {
d88aee68 184 int32_t fd;
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185 enum lttcomm_sock_proto proto;
186 struct lttcomm_sockaddr sockaddr;
187 const struct lttcomm_proto_ops *ops;
fc5e05b7 188} LTTNG_PACKED;
de5e9086 189
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190/*
191 * Relayd sock. Adds the protocol version to use for the communications with
192 * the relayd.
193 */
194struct lttcomm_relayd_sock {
195 struct lttcomm_sock sock;
196 uint32_t major;
197 uint32_t minor;
198} LTTNG_PACKED;
199
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200struct lttcomm_net_family {
201 int family;
202 int (*create) (struct lttcomm_sock *sock, int type, int proto);
203};
204
205struct lttcomm_proto_ops {
206 int (*bind) (struct lttcomm_sock *sock);
207 int (*close) (struct lttcomm_sock *sock);
208 int (*connect) (struct lttcomm_sock *sock);
209 struct lttcomm_sock *(*accept) (struct lttcomm_sock *sock);
210 int (*listen) (struct lttcomm_sock *sock, int backlog);
211 ssize_t (*recvmsg) (struct lttcomm_sock *sock, void *buf, size_t len,
212 int flags);
213 ssize_t (*sendmsg) (struct lttcomm_sock *sock, void *buf, size_t len,
214 int flags);
215};
216
fac6795d 217/*
9bda164d 218 * Data structure received from lttng client to session daemon.
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219 */
220struct lttcomm_session_msg {
d0b96690 221 uint32_t cmd_type; /* enum lttcomm_sessiond_command */
42abccdb 222 struct lttng_session session;
9f19cc17 223 struct lttng_domain domain;
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224 union {
225 struct {
db8870ed 226 char channel_name[LTTNG_SYMBOL_NAME_LEN];
f3ed775e 227 char name[NAME_MAX];
fc5e05b7 228 } LTTNG_PACKED disable;
f3ed775e 229 /* Event data */
fac6795d 230 struct {
db8870ed 231 char channel_name[LTTNG_SYMBOL_NAME_LEN];
f3ed775e 232 struct lttng_event event;
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233 /* Length of following bytecode for filter. */
234 uint32_t bytecode_len;
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235 /* exclusion data */
236 uint32_t exclusion_count;
237 /*
238 * After this structure, the following variable-length
239 * items are transmitted:
240 * - char exclusion_names[LTTNG_SYMBOL_NAME_LEN][exclusion_count]
241 * - unsigned char filter_bytecode[bytecode_len]
242 */
fc5e05b7 243 } LTTNG_PACKED enable;
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244 /* Create channel */
245 struct {
246 struct lttng_channel chan;
fc5e05b7 247 } LTTNG_PACKED channel;
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248 /* Context */
249 struct {
db8870ed 250 char channel_name[LTTNG_SYMBOL_NAME_LEN];
7d29a247 251 struct lttng_event_context ctx;
fc5e05b7 252 } LTTNG_PACKED context;
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253 /* Use by register_consumer */
254 struct {
255 char path[PATH_MAX];
fc5e05b7 256 } LTTNG_PACKED reg;
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257 /* List */
258 struct {
db8870ed 259 char channel_name[LTTNG_SYMBOL_NAME_LEN];
fc5e05b7 260 } LTTNG_PACKED list;
d0254c7c 261 struct lttng_calibrate calibrate;
a4b92340 262 /* Used by the set_consumer_url and used by create_session also call */
de5e9086 263 struct {
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264 /* Number of lttng_uri following */
265 uint32_t size;
fc5e05b7 266 } LTTNG_PACKED uri;
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267 struct {
268 struct lttng_snapshot_output output;
269 } LTTNG_PACKED snapshot_output;
270 struct {
271 uint32_t wait;
272 struct lttng_snapshot_output output;
273 } LTTNG_PACKED snapshot_record;
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274 struct {
275 uint32_t nb_uri;
276 unsigned int timer_interval; /* usec */
277 } LTTNG_PACKED session_live;
fac6795d 278 } u;
fc5e05b7 279} LTTNG_PACKED;
fac6795d 280
d93c4f1f 281#define LTTNG_FILTER_MAX_LEN 65536
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282
283/*
284 * Filter bytecode data. The reloc table is located at the end of the
285 * bytecode. It is made of tuples: (uint16_t, var. len. string). It
286 * starts at reloc_table_offset.
287 */
b6bbed5f 288#define LTTNG_FILTER_PADDING 32
53a80697 289struct lttng_filter_bytecode {
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290 uint32_t len; /* len of data */
291 uint32_t reloc_table_offset;
f3f0db50 292 uint64_t seqnum;
b6bbed5f 293 char padding[LTTNG_FILTER_PADDING];
53a80697 294 char data[0];
fc5e05b7 295} LTTNG_PACKED;
53a80697 296
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297/*
298 * Event exclusion data. At the end of the structure, there will actually
299 * by zero or more names, where the actual number of names is given by
300 * the 'count' item of the structure.
301 */
302#define LTTNG_EVENT_EXCLUSION_PADDING 32
303struct lttng_event_exclusion {
304 uint32_t count;
305 char padding[LTTNG_EVENT_EXCLUSION_PADDING];
306 char names[LTTNG_SYMBOL_NAME_LEN][0];
307} LTTNG_PACKED;
308
fac6795d 309/*
5e16da05 310 * Data structure for the response from sessiond to the lttng client.
fac6795d 311 */
5461b305 312struct lttcomm_lttng_msg {
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313 uint32_t cmd_type; /* enum lttcomm_sessiond_command */
314 uint32_t ret_code; /* enum lttcomm_return_code */
315 uint32_t pid; /* pid_t */
773168b7 316 uint32_t data_size;
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317 /* Contains: trace_name + data */
318 char payload[];
fc5e05b7 319} LTTNG_PACKED;
fac6795d 320
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321struct lttcomm_lttng_output_id {
322 uint32_t id;
323} LTTNG_PACKED;
324
6e3805e2 325/*
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326 * lttcomm_consumer_msg is the message sent from sessiond to consumerd
327 * to either add a channel, add a stream, update a stream, or stop
328 * operation.
6e3805e2 329 */
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330struct lttcomm_consumer_msg {
331 uint32_t cmd_type; /* enum consumerd_command */
332 union {
333 struct {
d88aee68 334 uint64_t channel_key;
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335 uint64_t session_id;
336 char pathname[PATH_MAX];
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337 uint32_t uid;
338 uint32_t gid;
339 uint64_t relayd_id;
c30aaa51 340 /* nb_init_streams is the number of streams open initially. */
d88aee68 341 uint32_t nb_init_streams;
de5e9086 342 char name[LTTNG_SYMBOL_NAME_LEN];
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343 /* Use splice or mmap to consume this fd */
344 enum lttng_event_output output;
345 int type; /* Per cpu or metadata. */
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346 uint64_t tracefile_size; /* bytes */
347 uint32_t tracefile_count; /* number of tracefiles */
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348 /* If the channel's streams have to be monitored or not. */
349 uint32_t monitor;
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350 /* timer to check the streams usage in live mode (usec). */
351 unsigned int live_timer_interval;
ffe60014 352 } LTTNG_PACKED channel; /* Only used by Kernel. */
3bd1e081 353 struct {
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354 uint64_t stream_key;
355 uint64_t channel_key;
356 int32_t cpu; /* On which CPU this stream is assigned. */
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357 /* Tells the consumer if the stream should be or not monitored. */
358 uint32_t no_monitor;
ffe60014 359 } LTTNG_PACKED stream; /* Only used by Kernel. */
de5e9086 360 struct {
d88aee68 361 uint64_t net_index;
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362 enum lttng_stream_type type;
363 /* Open socket to the relayd */
6151a90f 364 struct lttcomm_relayd_sock sock;
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365 /* Tracing session id associated to the relayd. */
366 uint64_t session_id;
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367 /* Relayd session id, only used with control socket. */
368 uint64_t relayd_session_id;
fc5e05b7 369 } LTTNG_PACKED relayd_sock;
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370 struct {
371 uint64_t net_seq_idx;
fc5e05b7 372 } LTTNG_PACKED destroy_relayd;
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373 struct {
374 uint64_t session_id;
fc5e05b7 375 } LTTNG_PACKED data_pending;
ffe60014 376 struct {
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377 uint64_t subbuf_size; /* bytes */
378 uint64_t num_subbuf; /* power of 2 */
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379 int32_t overwrite; /* 1: overwrite, 0: discard */
380 uint32_t switch_timer_interval; /* usec */
381 uint32_t read_timer_interval; /* usec */
ecc48a90 382 unsigned int live_timer_interval; /* usec */
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383 int32_t output; /* splice, mmap */
384 int32_t type; /* metadata or per_cpu */
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385 uint64_t session_id; /* Tracing session id */
386 char pathname[PATH_MAX]; /* Channel file path. */
ffe60014 387 char name[LTTNG_SYMBOL_NAME_LEN]; /* Channel name. */
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388 uint32_t uid; /* User ID of the session */
389 uint32_t gid; /* Group ID ot the session */
390 uint64_t relayd_id; /* Relayd id if apply. */
391 uint64_t key; /* Unique channel key. */
b6d38284 392 unsigned char uuid[UUID_LEN]; /* uuid for ust tracer. */
7972aab2 393 uint32_t chan_id; /* Channel ID on the tracer side. */
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394 uint64_t tracefile_size; /* bytes */
395 uint32_t tracefile_count; /* number of tracefiles */
1950109e 396 uint64_t session_id_per_pid; /* Per-pid session ID. */
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397 /* Tells the consumer if the stream should be or not monitored. */
398 uint32_t monitor;
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399 /*
400 * For UST per UID buffers, this is the application UID of the
401 * channel. This can be different from the user UID requesting the
402 * channel creation and used for the rights on the stream file
403 * because the application can be in the tracing for instance.
404 */
405 uint32_t ust_app_uid;
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406 } LTTNG_PACKED ask_channel;
407 struct {
d88aee68 408 uint64_t key;
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409 } LTTNG_PACKED get_channel;
410 struct {
d88aee68 411 uint64_t key;
ffe60014 412 } LTTNG_PACKED destroy_channel;
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413 struct {
414 uint64_t key; /* Metadata channel key. */
415 uint64_t target_offset; /* Offset in the consumer */
416 uint64_t len; /* Length of metadata to be received. */
417 } LTTNG_PACKED push_metadata;
418 struct {
419 uint64_t key; /* Metadata channel key. */
420 } LTTNG_PACKED close_metadata;
421 struct {
422 uint64_t key; /* Metadata channel key. */
423 } LTTNG_PACKED setup_metadata;
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424 struct {
425 uint64_t key; /* Channel key. */
426 } LTTNG_PACKED flush_channel;
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427 struct {
428 char pathname[PATH_MAX];
429 /* Indicate if the snapshot goes on the relayd or locally. */
430 uint32_t use_relayd;
431 uint32_t metadata; /* This a metadata snapshot. */
432 uint64_t relayd_id; /* Relayd id if apply. */
433 uint64_t key;
5c786ded 434 uint64_t max_stream_size;
6dc3064a 435 } LTTNG_PACKED snapshot_channel;
3bd1e081 436 } u;
fc5e05b7 437} LTTNG_PACKED;
6e3805e2 438
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439/*
440 * Status message returned to the sessiond after a received command.
441 */
442struct lttcomm_consumer_status_msg {
0c759fc9 443 enum lttcomm_return_code ret_code;
fc5e05b7 444} LTTNG_PACKED;
f50f23d9 445
ffe60014 446struct lttcomm_consumer_status_channel {
0c759fc9 447 enum lttcomm_return_code ret_code;
d88aee68 448 uint64_t key;
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449 unsigned int stream_count;
450} LTTNG_PACKED;
451
74d0b642 452#ifdef HAVE_LIBLTTNG_UST_CTL
3bd1e081 453
9df8df5e 454#include <lttng/ust-abi.h>
6e3805e2 455
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456/*
457 * Data structure for the commands sent from sessiond to UST.
458 */
459struct lttcomm_ust_msg {
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460 uint32_t handle;
461 uint32_t cmd;
462 union {
3817e7df 463 struct lttng_ust_channel channel;
00a17c97 464 struct lttng_ust_stream stream;
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465 struct lttng_ust_event event;
466 struct lttng_ust_context context;
00a17c97 467 struct lttng_ust_tracer_version version;
3817e7df 468 } u;
fc5e05b7 469} LTTNG_PACKED;
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470
471/*
472 * Data structure for the response from UST to the session daemon.
473 * cmd_type is sent back in the reply for validation.
474 */
475struct lttcomm_ust_reply {
476 uint32_t handle;
477 uint32_t cmd;
478 uint32_t ret_code; /* enum lttcomm_return_code */
479 uint32_t ret_val; /* return value */
480 union {
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481 struct {
482 uint64_t memory_map_size;
fc5e05b7 483 } LTTNG_PACKED channel;
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484 struct {
485 uint64_t memory_map_size;
fc5e05b7 486 } LTTNG_PACKED stream;
00a17c97 487 struct lttng_ust_tracer_version version;
3817e7df 488 } u;
fc5e05b7 489} LTTNG_PACKED;
3817e7df 490
74d0b642 491#endif /* HAVE_LIBLTTNG_UST_CTL */
3bd1e081 492
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493extern const char *lttcomm_get_readable_code(enum lttcomm_return_code code);
494
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495extern int lttcomm_init_inet_sockaddr(struct lttcomm_sockaddr *sockaddr,
496 const char *ip, unsigned int port);
497extern int lttcomm_init_inet6_sockaddr(struct lttcomm_sockaddr *sockaddr,
498 const char *ip, unsigned int port);
499
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500extern struct lttcomm_sock *lttcomm_alloc_sock(enum lttcomm_sock_proto proto);
501extern int lttcomm_create_sock(struct lttcomm_sock *sock);
502extern struct lttcomm_sock *lttcomm_alloc_sock_from_uri(struct lttng_uri *uri);
503extern void lttcomm_destroy_sock(struct lttcomm_sock *sock);
504extern struct lttcomm_sock *lttcomm_alloc_copy_sock(struct lttcomm_sock *src);
505extern void lttcomm_copy_sock(struct lttcomm_sock *dst,
506 struct lttcomm_sock *src);
6364a07a 507
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508/* Relayd socket object. */
509extern struct lttcomm_relayd_sock *lttcomm_alloc_relayd_sock(
510 struct lttng_uri *uri, uint32_t major, uint32_t minor);
511
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512extern int lttcomm_setsockopt_rcv_timeout(int sock, unsigned int msec);
513extern int lttcomm_setsockopt_snd_timeout(int sock, unsigned int msec);
514
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515extern void lttcomm_init(void);
516/* Get network timeout, in milliseconds */
517extern unsigned long lttcomm_get_network_timeout(void);
518
773168b7 519#endif /* _LTTNG_SESSIOND_COMM_H */
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