Fix: report error to client on consumerd error
[lttng-tools.git] / src / common / sessiond-comm / sessiond-comm.h
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Julien Desfossez <julien.desfossez@polymtl.ca>
4 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 *
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.
9 *
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
13 * more details.
14 *
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.
18 */
19
20 /*
21 * This header is meant for liblttng and libust internal use ONLY. These
22 * declarations should NOT be considered stable API.
23 */
24
25 #ifndef _LTTNG_SESSIOND_COMM_H
26 #define _LTTNG_SESSIOND_COMM_H
27
28 #define _GNU_SOURCE
29 #include <limits.h>
30 #include <lttng/lttng.h>
31 #include <common/compat/socket.h>
32
33 /* Queue size of listen(2) */
34 #define LTTNG_SESSIOND_COMM_MAX_LISTEN 64
35
36 /* Maximum number of FDs that can be sent over a Unix socket */
37 #define LTTCOMM_MAX_SEND_FDS 4
38
39 /*
40 * Get the error code index from 0 since LTTCOMM_OK start at 1000
41 */
42 #define LTTCOMM_ERR_INDEX(code) (code - LTTCOMM_OK)
43
44 enum lttcomm_sessiond_command {
45 /* Tracer command */
46 LTTNG_ADD_CONTEXT,
47 LTTNG_CALIBRATE,
48 LTTNG_DISABLE_CHANNEL,
49 LTTNG_DISABLE_EVENT,
50 LTTNG_DISABLE_ALL_EVENT,
51 LTTNG_ENABLE_CHANNEL,
52 LTTNG_ENABLE_EVENT,
53 LTTNG_ENABLE_ALL_EVENT,
54 /* Session daemon command */
55 LTTNG_CREATE_SESSION,
56 LTTNG_DESTROY_SESSION,
57 LTTNG_LIST_CHANNELS,
58 LTTNG_LIST_DOMAINS,
59 LTTNG_LIST_EVENTS,
60 LTTNG_LIST_SESSIONS,
61 LTTNG_LIST_TRACEPOINTS,
62 LTTNG_REGISTER_CONSUMER,
63 LTTNG_START_TRACE,
64 LTTNG_STOP_TRACE,
65 };
66
67 /*
68 * lttcomm error code.
69 */
70 enum lttcomm_return_code {
71 LTTCOMM_OK = 10, /* Ok */
72 LTTCOMM_ERR, /* Unknown Error */
73 LTTCOMM_UND, /* Undefine command */
74 LTTCOMM_NOT_IMPLEMENTED, /* Command not implemented */
75 LTTCOMM_UNKNOWN_DOMAIN, /* Tracing domain not known */
76 LTTCOMM_ALLOC_FAIL, /* Trace allocation fail */
77 LTTCOMM_NO_SESSION, /* No session found */
78 LTTCOMM_CREATE_DIR_FAIL, /* Create directory fail */
79 LTTCOMM_SESSION_FAIL, /* Create session fail */
80 LTTCOMM_START_FAIL, /* Start tracing fail */
81 LTTCOMM_STOP_FAIL, /* Stop tracing fail */
82 LTTCOMM_LIST_FAIL, /* Listing apps fail */
83 LTTCOMM_NO_APPS, /* No traceable application */
84 LTTCOMM_SESS_NOT_FOUND, /* Session name not found */
85 LTTCOMM_NO_TRACE, /* No trace exist */
86 LTTCOMM_FATAL, /* Session daemon had a fatal error */
87 LTTCOMM_NO_TRACEABLE, /* Error for non traceable app */
88 LTTCOMM_SELECT_SESS, /* Must select a session */
89 LTTCOMM_EXIST_SESS, /* Session name already exist */
90 LTTCOMM_NO_EVENT, /* No event found */
91 LTTCOMM_CONNECT_FAIL, /* Unable to connect to unix socket */
92 LTTCOMM_APP_NOT_FOUND, /* App not found in traceable app list */
93 LTTCOMM_EPERM, /* Permission denied */
94 LTTCOMM_KERN_NA, /* Kernel tracer unavalable */
95 LTTCOMM_KERN_VERSION, /* Kernel tracer version is not compatible */
96 LTTCOMM_KERN_EVENT_EXIST, /* Kernel event already exists */
97 LTTCOMM_KERN_SESS_FAIL, /* Kernel create session failed */
98 LTTCOMM_KERN_CHAN_EXIST, /* Kernel channel already exists */
99 LTTCOMM_KERN_CHAN_FAIL, /* Kernel create channel failed */
100 LTTCOMM_KERN_CHAN_NOT_FOUND, /* Kernel channel not found */
101 LTTCOMM_KERN_CHAN_DISABLE_FAIL, /* Kernel disable channel failed */
102 LTTCOMM_KERN_CHAN_ENABLE_FAIL, /* Kernel enable channel failed */
103 LTTCOMM_KERN_CONTEXT_FAIL, /* Kernel add context failed */
104 LTTCOMM_KERN_ENABLE_FAIL, /* Kernel enable event failed */
105 LTTCOMM_KERN_DISABLE_FAIL, /* Kernel disable event failed */
106 LTTCOMM_KERN_META_FAIL, /* Kernel open metadata failed */
107 LTTCOMM_KERN_START_FAIL, /* Kernel start trace failed */
108 LTTCOMM_KERN_STOP_FAIL, /* Kernel stop trace failed */
109 LTTCOMM_KERN_CONSUMER_FAIL, /* Kernel consumer start failed */
110 LTTCOMM_KERN_STREAM_FAIL, /* Kernel create stream failed */
111 LTTCOMM_KERN_DIR_FAIL, /* Kernel trace directory creation failed */
112 LTTCOMM_KERN_DIR_EXIST, /* Kernel trace directory exist */
113 LTTCOMM_KERN_NO_SESSION, /* No kernel session found */
114 LTTCOMM_KERN_LIST_FAIL, /* Kernel listing events failed */
115 LTTCOMM_UST_CALIBRATE_FAIL, /* UST calibration failed */
116 LTTCOMM_UST_VERSION, /* UST tracer version is not compatible */
117 LTTCOMM_UST_SESS_FAIL, /* UST create session failed */
118 LTTCOMM_UST_CHAN_EXIST, /* UST channel already exist */
119 LTTCOMM_UST_CHAN_FAIL, /* UST create channel failed */
120 LTTCOMM_UST_CHAN_NOT_FOUND, /* UST channel not found */
121 LTTCOMM_UST_CHAN_DISABLE_FAIL, /* UST disable channel failed */
122 LTTCOMM_UST_CHAN_ENABLE_FAIL, /* UST enable channel failed */
123 LTTCOMM_UST_CONTEXT_FAIL, /* UST add context failed */
124 LTTCOMM_UST_ENABLE_FAIL, /* UST enable event failed */
125 LTTCOMM_UST_DISABLE_FAIL, /* UST disable event failed */
126 LTTCOMM_UST_META_FAIL, /* UST open metadata failed */
127 LTTCOMM_UST_START_FAIL, /* UST start trace failed */
128 LTTCOMM_UST_STOP_FAIL, /* UST stop trace failed */
129 LTTCOMM_UST_CONSUMER64_FAIL, /* 64-bit UST consumer start failed */
130 LTTCOMM_UST_CONSUMER32_FAIL, /* 32-bit UST consumer start failed */
131 LTTCOMM_UST_STREAM_FAIL, /* UST create stream failed */
132 LTTCOMM_UST_DIR_FAIL, /* UST trace directory creation failed */
133 LTTCOMM_UST_DIR_EXIST, /* UST trace directory exist */
134 LTTCOMM_UST_NO_SESSION, /* No UST session found */
135 LTTCOMM_UST_LIST_FAIL, /* UST listing events failed */
136 LTTCOMM_UST_EVENT_EXIST, /* UST event exist */
137 LTTCOMM_UST_EVENT_NOT_FOUND, /* UST event not found */
138 LTTCOMM_UST_CONTEXT_EXIST, /* UST context exist */
139 LTTCOMM_UST_CONTEXT_INVAL, /* UST context invalid */
140 LTTCOMM_NEED_ROOT_SESSIOND, /* root sessiond is needed */
141 LTTCOMM_TRACE_ALREADY_STARTED, /* Tracing already started */
142 LTTCOMM_TRACE_ALREADY_STOPPED, /* Tracing already stopped */
143 LTTCOMM_KERN_EVENT_ENOSYS, /* Kernel event type not supported */
144
145 CONSUMERD_COMMAND_SOCK_READY, /* when consumerd command socket ready */
146 CONSUMERD_SUCCESS_RECV_FD, /* success on receiving fds */
147 CONSUMERD_ERROR_RECV_FD, /* error on receiving fds */
148 CONSUMERD_ERROR_RECV_CMD, /* error on receiving command */
149 CONSUMERD_POLL_ERROR, /* Error in polling thread in kconsumerd */
150 CONSUMERD_POLL_NVAL, /* Poll on closed fd */
151 CONSUMERD_POLL_HUP, /* All fds have hungup */
152 CONSUMERD_EXIT_SUCCESS, /* kconsumerd exiting normally */
153 CONSUMERD_EXIT_FAILURE, /* kconsumerd exiting on error */
154 CONSUMERD_OUTFD_ERROR, /* error opening the tracefile */
155 CONSUMERD_SPLICE_EBADF, /* EBADF from splice(2) */
156 CONSUMERD_SPLICE_EINVAL, /* EINVAL from splice(2) */
157 CONSUMERD_SPLICE_ENOMEM, /* ENOMEM from splice(2) */
158 CONSUMERD_SPLICE_ESPIPE, /* ESPIPE from splice(2) */
159 LTTCOMM_INVALID, /* Invalid parameter */
160 LTTCOMM_NO_USTCONSUMERD, /* No UST consumer detected */
161 LTTCOMM_NO_KERNCONSUMERD, /* No Kernel consumer detected */
162
163 /* MUST be last element */
164 LTTCOMM_NR, /* Last element */
165 };
166
167 /*
168 * Data structure received from lttng client to session daemon.
169 */
170 struct lttcomm_session_msg {
171 uint32_t cmd_type; /* enum lttcomm_sessiond_command */
172 struct lttng_session session;
173 struct lttng_domain domain;
174 union {
175 struct {
176 char channel_name[NAME_MAX];
177 char name[NAME_MAX];
178 } disable;
179 /* Event data */
180 struct {
181 char channel_name[NAME_MAX];
182 struct lttng_event event;
183 } enable;
184 /* Create channel */
185 struct {
186 struct lttng_channel chan;
187 } channel;
188 /* Context */
189 struct {
190 char channel_name[NAME_MAX];
191 char event_name[NAME_MAX];
192 struct lttng_event_context ctx;
193 } context;
194 /* Use by register_consumer */
195 struct {
196 char path[PATH_MAX];
197 } reg;
198 /* List */
199 struct {
200 char channel_name[NAME_MAX];
201 } list;
202 struct lttng_calibrate calibrate;
203 } u;
204 };
205
206 /*
207 * Data structure for the response from sessiond to the lttng client.
208 */
209 struct lttcomm_lttng_msg {
210 uint32_t cmd_type; /* enum lttcomm_sessiond_command */
211 uint32_t ret_code; /* enum lttcomm_return_code */
212 uint32_t pid; /* pid_t */
213 uint32_t data_size;
214 /* Contains: trace_name + data */
215 char payload[];
216 };
217
218 /*
219 * lttcomm_consumer_msg is the message sent from sessiond to consumerd
220 * to either add a channel, add a stream, update a stream, or stop
221 * operation.
222 */
223 struct lttcomm_consumer_msg {
224 uint32_t cmd_type; /* enum consumerd_command */
225 union {
226 struct {
227 int channel_key;
228 uint64_t max_sb_size; /* the subbuffer size for this channel */
229 /* shm_fd and wait_fd are sent as ancillary data */
230 uint64_t mmap_len;
231 } channel;
232 struct {
233 int channel_key;
234 int stream_key;
235 /* shm_fd and wait_fd are sent as ancillary data */
236 uint32_t state; /* enum lttcomm_consumer_fd_state */
237 enum lttng_event_output output; /* use splice or mmap to consume this fd */
238 uint64_t mmap_len;
239 uid_t uid; /* User ID owning the session */
240 gid_t gid; /* Group ID owning the session */
241 char path_name[PATH_MAX];
242 } stream;
243 } u;
244 };
245
246 #ifdef HAVE_LIBLTTNG_UST_CTL
247
248 #include <lttng/ust-abi.h>
249
250 /*
251 * Data structure for the commands sent from sessiond to UST.
252 */
253 struct lttcomm_ust_msg {
254 uint32_t handle;
255 uint32_t cmd;
256 union {
257 struct lttng_ust_channel channel;
258 struct lttng_ust_stream stream;
259 struct lttng_ust_event event;
260 struct lttng_ust_context context;
261 struct lttng_ust_tracer_version version;
262 } u;
263 };
264
265 /*
266 * Data structure for the response from UST to the session daemon.
267 * cmd_type is sent back in the reply for validation.
268 */
269 struct lttcomm_ust_reply {
270 uint32_t handle;
271 uint32_t cmd;
272 uint32_t ret_code; /* enum lttcomm_return_code */
273 uint32_t ret_val; /* return value */
274 union {
275 struct {
276 uint64_t memory_map_size;
277 } channel;
278 struct {
279 uint64_t memory_map_size;
280 } stream;
281 struct lttng_ust_tracer_version version;
282 } u;
283 };
284
285 #endif /* HAVE_LIBLTTNG_UST_CTL */
286
287 extern int lttcomm_create_unix_sock(const char *pathname);
288 extern int lttcomm_connect_unix_sock(const char *pathname);
289 extern int lttcomm_accept_unix_sock(int sock);
290 extern int lttcomm_listen_unix_sock(int sock);
291 extern int lttcomm_close_unix_sock(int sock);
292
293 /* Send a message accompanied by fd(s) over a unix socket. */
294 extern ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd);
295 /* Recv a message accompanied by fd(s) from a unix socket */
296 extern ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd);
297
298 extern ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len);
299 extern ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len);
300
301 extern ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len);
302 extern ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len,
303 lttng_sock_cred *creds);
304
305 extern const char *lttcomm_get_readable_code(enum lttcomm_return_code code);
306 extern int lttcomm_setsockopt_creds_unix_sock(int sock);
307
308 #endif /* _LTTNG_SESSIOND_COMM_H */
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