Add UST event exist error code
[lttng-tools.git] / include / lttng-sessiond-comm.h
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1#ifndef _LTTNG_SESSIOND_COMM_H
2#define _LTTNG_SESSIOND_COMM_H
3
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4/*
5 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
6 * Julien Desfossez <julien.desfossez@polymtl.ca>
773168b7 7 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
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11 * as published by the Free Software Foundation; only version 2
12 * of the License.
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13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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22 */
23
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24/*
25 * This header is meant for liblttng and libust internal use ONLY.
26 * These declarations should NOT be considered stable API.
27 */
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28
29#include <limits.h>
f3ed775e 30#include <lttng/lttng.h>
5e16da05 31
f4688807 32#define LTTNG_RUNDIR "/var/run/lttng"
1526bda7 33
fac6795d 34/* Default unix socket path */
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35#define DEFAULT_GLOBAL_CLIENT_UNIX_SOCK LTTNG_RUNDIR "/client-lttng-sessiond"
36#define DEFAULT_GLOBAL_APPS_UNIX_SOCK LTTNG_RUNDIR "/apps-lttng-sessiond"
37#define DEFAULT_HOME_APPS_UNIX_SOCK "%s/.apps-lttng-sessiond"
38#define DEFAULT_HOME_CLIENT_UNIX_SOCK "%s/.client-lttng-sessiond"
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39
40/* Queue size of listen(2) */
f158a754 41#define LTTNG_SESSIOND_COMM_MAX_LISTEN 64
fac6795d 42
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43/*
44 * Get the error code index from 0 since LTTCOMM_OK start at 1000
fac6795d 45 */
686204ab 46#define LTTCOMM_ERR_INDEX(code) (code - LTTCOMM_OK)
fac6795d 47
6abb15de 48enum lttcomm_sessiond_command {
0d0c377a 49 /* Tracer command */
b579acd9 50 LTTNG_ADD_CONTEXT,
f4688807 51 LTTNG_CALIBRATE,
0b97ec54 52 LTTNG_DISABLE_CHANNEL,
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53 LTTNG_DISABLE_EVENT,
54 LTTNG_DISABLE_ALL_EVENT,
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55 LTTNG_ENABLE_CHANNEL,
56 LTTNG_ENABLE_EVENT,
57 LTTNG_ENABLE_ALL_EVENT,
58 /* Session daemon command */
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59 LTTNG_CREATE_SESSION,
60 LTTNG_DESTROY_SESSION,
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61 LTTNG_LIST_CHANNELS,
62 LTTNG_LIST_DOMAINS,
f3ed775e 63 LTTNG_LIST_EVENTS,
9f19cc17 64 LTTNG_LIST_SESSIONS,
052da939 65 LTTNG_LIST_TRACEPOINTS,
d9800920 66 LTTNG_REGISTER_CONSUMER,
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67 LTTNG_START_TRACE,
68 LTTNG_STOP_TRACE,
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69};
70
71/*
72 * lttcomm error code.
73 */
74enum lttcomm_return_code {
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75 LTTCOMM_OK = 1000, /* Ok */
76 LTTCOMM_ERR, /* Unknown Error */
77 LTTCOMM_UND, /* Undefine command */
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78 LTTCOMM_NOT_IMPLEMENTED, /* Command not implemented */
79 LTTCOMM_UNKNOWN_DOMAIN, /* Tracing domain not known */
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80 LTTCOMM_ALLOC_FAIL, /* Trace allocation fail */
81 LTTCOMM_NO_SESSION, /* No session found */
82 LTTCOMM_CREATE_FAIL, /* Create trace fail */
83 LTTCOMM_SESSION_FAIL, /* Create session fail */
84 LTTCOMM_START_FAIL, /* Start tracing fail */
85 LTTCOMM_STOP_FAIL, /* Stop tracing fail */
86 LTTCOMM_LIST_FAIL, /* Listing apps fail */
87 LTTCOMM_NO_APPS, /* No traceable application */
f3ed775e 88 LTTCOMM_SESS_NOT_FOUND, /* Session name not found */
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89 LTTCOMM_NO_TRACE, /* No trace exist */
90 LTTCOMM_FATAL, /* Session daemon had a fatal error */
91 LTTCOMM_NO_TRACEABLE, /* Error for non traceable app */
92 LTTCOMM_SELECT_SESS, /* Must select a session */
93 LTTCOMM_EXIST_SESS, /* Session name already exist */
94 LTTCOMM_NO_EVENT, /* No event found */
d9800920 95 LTTCOMM_CONNECT_FAIL, /* Unable to connect to unix socket */
2b0bf864 96 LTTCOMM_APP_NOT_FOUND, /* App not found in traceable app list */
20fe2104 97 LTTCOMM_KERN_NA, /* Kernel tracer unavalable */
7d29a247 98 LTTCOMM_KERN_EVENT_EXIST, /* Kernel event already exists */
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99 LTTCOMM_KERN_SESS_FAIL, /* Kernel create session failed */
100 LTTCOMM_KERN_CHAN_FAIL, /* Kernel create channel failed */
f3ed775e 101 LTTCOMM_KERN_CHAN_NOT_FOUND, /* Kernel channel not found */
26cc6b4e 102 LTTCOMM_KERN_CHAN_DISABLE_FAIL, /* Kernel disable channel failed */
d36b8583 103 LTTCOMM_KERN_CHAN_ENABLE_FAIL, /* Kernel enable channel failed */
d65106b1 104 LTTCOMM_KERN_CONTEXT_FAIL, /* Kernel add context failed */
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105 LTTCOMM_KERN_ENABLE_FAIL, /* Kernel enable event failed */
106 LTTCOMM_KERN_DISABLE_FAIL, /* Kernel disable event failed */
aaf26714 107 LTTCOMM_KERN_META_FAIL, /* Kernel open metadata failed */
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108 LTTCOMM_KERN_START_FAIL, /* Kernel start trace failed */
109 LTTCOMM_KERN_STOP_FAIL, /* Kernel stop trace failed */
110 LTTCOMM_KERN_CONSUMER_FAIL, /* Kernel consumer start failed */
111 LTTCOMM_KERN_STREAM_FAIL, /* Kernel create stream failed */
112 LTTCOMM_KERN_DIR_FAIL, /* Kernel trace directory creation failed */
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113 LTTCOMM_KERN_DIR_EXIST, /* Kernel trace directory exist */
114 LTTCOMM_KERN_NO_SESSION, /* No kernel session found */
2ef84c95 115 LTTCOMM_KERN_LIST_FAIL, /* Kernel listing events failed */
0177d773 116 LTTCOMM_UST_SESS_FAIL, /* UST create session failed */
f6a9efaa 117 LTTCOMM_UST_CHAN_EXIST, /* UST channel already exist */
2bdd86d4 118 LTTCOMM_UST_CHAN_FAIL, /* UST create channel failed */
2b0bf864 119 LTTCOMM_UST_CHAN_NOT_FOUND, /* UST channel not found */
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120 LTTCOMM_UST_CHAN_DISABLE_FAIL, /* UST disable channel failed */
121 LTTCOMM_UST_CHAN_ENABLE_FAIL, /* UST enable channel failed */
122 LTTCOMM_UST_CONTEXT_FAIL, /* UST add context failed */
123 LTTCOMM_UST_ENABLE_FAIL, /* UST enable event failed */
124 LTTCOMM_UST_DISABLE_FAIL, /* UST disable event failed */
125 LTTCOMM_UST_META_FAIL, /* UST open metadata failed */
126 LTTCOMM_UST_START_FAIL, /* UST start trace failed */
127 LTTCOMM_UST_STOP_FAIL, /* UST stop trace failed */
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128 LTTCOMM_UST_CONSUMER64_FAIL, /* 64-bit UST consumer start failed */
129 LTTCOMM_UST_CONSUMER32_FAIL, /* 32-bit UST consumer start failed */
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130 LTTCOMM_UST_STREAM_FAIL, /* UST create stream failed */
131 LTTCOMM_UST_DIR_FAIL, /* UST trace directory creation failed */
132 LTTCOMM_UST_DIR_EXIST, /* UST trace directory exist */
133 LTTCOMM_UST_NO_SESSION, /* No UST session found */
134 LTTCOMM_UST_LIST_FAIL, /* UST listing events failed */
3b25d04d 135 LTTCOMM_UST_EVENT_EXIST, /* UST event exist */
2bdd86d4 136
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137 CONSUMERD_COMMAND_SOCK_READY, /* when consumerd command socket ready */
138 CONSUMERD_SUCCESS_RECV_FD, /* success on receiving fds */
139 CONSUMERD_ERROR_RECV_FD, /* error on receiving fds */
f2fc6720 140 CONSUMERD_ERROR_RECV_CMD, /* error on receiving command */
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141 CONSUMERD_POLL_ERROR, /* Error in polling thread in kconsumerd */
142 CONSUMERD_POLL_NVAL, /* Poll on closed fd */
143 CONSUMERD_POLL_HUP, /* All fds have hungup */
144 CONSUMERD_EXIT_SUCCESS, /* kconsumerd exiting normally */
145 CONSUMERD_EXIT_FAILURE, /* kconsumerd exiting on error */
146 CONSUMERD_OUTFD_ERROR, /* error opening the tracefile */
147 CONSUMERD_SPLICE_EBADF, /* EBADF from splice(2) */
148 CONSUMERD_SPLICE_EINVAL, /* EINVAL from splice(2) */
149 CONSUMERD_SPLICE_ENOMEM, /* ENOMEM from splice(2) */
150 CONSUMERD_SPLICE_ESPIPE, /* ESPIPE from splice(2) */
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151 /* MUST be last element */
152 LTTCOMM_NR, /* Last element */
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153};
154
155/*
9bda164d 156 * Data structure received from lttng client to session daemon.
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157 */
158struct lttcomm_session_msg {
773168b7 159 uint32_t cmd_type; /* enum lttcomm_sessiond_command */
42abccdb 160 struct lttng_session session;
9f19cc17 161 struct lttng_domain domain;
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162 union {
163 struct {
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164 char channel_name[NAME_MAX];
165 char name[NAME_MAX];
166 } disable;
167 /* Event data */
fac6795d 168 struct {
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169 char channel_name[NAME_MAX];
170 struct lttng_event event;
171 } enable;
172 /* Create channel */
173 struct {
174 struct lttng_channel chan;
175 } channel;
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176 /* Context */
177 struct {
178 char channel_name[NAME_MAX];
179 char event_name[NAME_MAX];
7d29a247 180 struct lttng_event_context ctx;
d65106b1 181 } context;
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182 /* Use by register_consumer */
183 struct {
184 char path[PATH_MAX];
185 } reg;
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186 /* List */
187 struct {
188 char channel_name[NAME_MAX];
189 } list;
d0254c7c 190 struct lttng_calibrate calibrate;
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191 } u;
192};
193
194/*
5e16da05 195 * Data structure for the response from sessiond to the lttng client.
fac6795d 196 */
5461b305 197struct lttcomm_lttng_msg {
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198 uint32_t cmd_type; /* enum lttcomm_sessiond_command */
199 uint32_t ret_code; /* enum lttcomm_return_code */
200 uint32_t pid; /* pid_t */
201 uint32_t data_size;
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202 /* Contains: trace_name + data */
203 char payload[];
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204};
205
6e3805e2 206/*
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207 * lttcomm_consumer_msg is the message sent from sessiond to consumerd
208 * to either add a channel, add a stream, update a stream, or stop
209 * operation.
6e3805e2 210 */
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211struct lttcomm_consumer_msg {
212 uint32_t cmd_type; /* enum consumerd_command */
213 union {
214 struct {
215 int channel_key;
216 uint64_t max_sb_size; /* the subbuffer size for this channel */
217 /* shm_fd and wait_fd are sent as ancillary data */
218 uint64_t mmap_len;
219 } channel;
220 struct {
221 int channel_key;
222 int stream_key;
223 /* shm_fd and wait_fd are sent as ancillary data */
224 uint32_t state; /* enum lttcomm_consumer_fd_state */
225 enum lttng_event_output output; /* use splice or mmap to consume this fd */
226 uint64_t mmap_len;
227 char path_name[PATH_MAX];
228 } stream;
229 } u;
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230};
231
74d0b642 232#ifdef HAVE_LIBLTTNG_UST_CTL
3bd1e081 233
9df8df5e 234#include <lttng/ust-abi.h>
6e3805e2 235
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236/*
237 * Data structure for the commands sent from sessiond to UST.
238 */
239struct lttcomm_ust_msg {
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240 uint32_t handle;
241 uint32_t cmd;
242 union {
3817e7df 243 struct lttng_ust_channel channel;
00a17c97 244 struct lttng_ust_stream stream;
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245 struct lttng_ust_event event;
246 struct lttng_ust_context context;
00a17c97 247 struct lttng_ust_tracer_version version;
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248 } u;
249};
250
251/*
252 * Data structure for the response from UST to the session daemon.
253 * cmd_type is sent back in the reply for validation.
254 */
255struct lttcomm_ust_reply {
256 uint32_t handle;
257 uint32_t cmd;
258 uint32_t ret_code; /* enum lttcomm_return_code */
259 uint32_t ret_val; /* return value */
260 union {
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261 struct {
262 uint64_t memory_map_size;
263 } channel;
264 struct {
265 uint64_t memory_map_size;
266 } stream;
00a17c97 267 struct lttng_ust_tracer_version version;
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268 } u;
269};
270
74d0b642 271#endif /* HAVE_LIBLTTNG_UST_CTL */
3bd1e081 272
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273extern int lttcomm_create_unix_sock(const char *pathname);
274extern int lttcomm_connect_unix_sock(const char *pathname);
275extern int lttcomm_accept_unix_sock(int sock);
276extern int lttcomm_listen_unix_sock(int sock);
87378cf5 277extern int lttcomm_close_unix_sock(int sock);
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278
279#define LTTCOMM_MAX_SEND_FDS 4
280/* Send a message accompanied by fd(s) over a unix socket. */
281extern ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd);
282/* Recv a message accompanied by fd(s) from a unix socket */
283extern ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd);
284
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285extern ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len);
286extern ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len);
287extern const char *lttcomm_get_readable_code(enum lttcomm_return_code code);
288
773168b7 289#endif /* _LTTNG_SESSIOND_COMM_H */
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