Handle splice errors
[lttng-tools.git] / liblttsessiondcomm / liblttsessiondcomm.h
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Julien Desfossez <julien.desfossez@polymtl.ca>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 *
19 */
20
21 #ifndef _LIBLTTSESSIONDCOMM_H
22 #define _LIBLTTSESSIONDCOMM_H
23
24 #include <limits.h>
25 #include <uuid/uuid.h>
26
27 #include "lttng-share.h"
28
29 #define LTTNG_RUNDIR "/var/run/lttng"
30
31 /* Default unix socket path */
32 #define DEFAULT_GLOBAL_CLIENT_UNIX_SOCK LTTNG_RUNDIR "/client-ltt-sessiond"
33 #define DEFAULT_GLOBAL_APPS_UNIX_SOCK LTTNG_RUNDIR "/apps-ltt-sessiond"
34 #define DEFAULT_HOME_APPS_UNIX_SOCK "%s/.apps-ltt-sessiond"
35 #define DEFAULT_HOME_CLIENT_UNIX_SOCK "%s/.client-ltt-sessiond"
36
37 /* Kernel consumer path */
38 #define KCONSUMERD_PATH LTTNG_RUNDIR "/kconsumerd"
39 #define KCONSUMERD_CMD_SOCK_PATH KCONSUMERD_PATH "/command"
40 #define KCONSUMERD_ERR_SOCK_PATH KCONSUMERD_PATH "/error"
41
42 /* Queue size of listen(2) */
43 #define MAX_LISTEN 10
44
45 /* Get the error code index from 0 since
46 * LTTCOMM_OK start at 1000
47 */
48 #define LTTCOMM_ERR_INDEX(code) (code - LTTCOMM_OK)
49
50 enum lttcomm_sessiond_command {
51 KERNEL_CREATE_CHANNEL,
52 KERNEL_CREATE_SESSION,
53 KERNEL_DISABLE_EVENT,
54 KERNEL_ENABLE_EVENT,
55 KERNEL_START_TRACE,
56 KERNEL_STOP_TRACE,
57 LTTNG_CREATE_SESSION,
58 LTTNG_DESTROY_SESSION,
59 LTTNG_FORCE_SUBBUF_SWITCH,
60 LTTNG_GET_ALL_SESSION,
61 LTTNG_GET_SOCK_PATH,
62 LTTNG_GET_SUBBUF_NUM_SIZE,
63 LTTNG_LIST_MARKERS,
64 LTTNG_LIST_SESSIONS,
65 LTTNG_LIST_TRACES,
66 LTTNG_LIST_TRACE_EVENTS,
67 LTTNG_SETUP_TRACE,
68 LTTNG_SET_SOCK_PATH,
69 LTTNG_SET_SUBBUF_NUM,
70 LTTNG_SET_SUBBUF_SIZE,
71 UST_ALLOC_TRACE,
72 UST_CREATE_TRACE,
73 UST_DESTROY_TRACE,
74 UST_DISABLE_MARKER,
75 UST_ENABLE_MARKER,
76 UST_LIST_APPS,
77 UST_START_TRACE,
78 UST_STOP_TRACE,
79 };
80
81 /*
82 * lttcomm error code.
83 */
84 enum lttcomm_return_code {
85 LTTCOMM_OK = 1000, /* Ok */
86 LTTCOMM_ERR, /* Unknown Error */
87 LTTCOMM_UND, /* Undefine command */
88 LTTCOMM_ALLOC_FAIL, /* Trace allocation fail */
89 LTTCOMM_NO_SESSION, /* No session found */
90 LTTCOMM_CREATE_FAIL, /* Create trace fail */
91 LTTCOMM_SESSION_FAIL, /* Create session fail */
92 LTTCOMM_START_FAIL, /* Start tracing fail */
93 LTTCOMM_STOP_FAIL, /* Stop tracing fail */
94 LTTCOMM_LIST_FAIL, /* Listing apps fail */
95 LTTCOMM_NO_APPS, /* No traceable application */
96 LTTCOMM_NO_SESS, /* No sessions available */
97 LTTCOMM_NO_TRACE, /* No trace exist */
98 LTTCOMM_FATAL, /* Session daemon had a fatal error */
99 LTTCOMM_NO_TRACEABLE, /* Error for non traceable app */
100 LTTCOMM_SELECT_SESS, /* Must select a session */
101 LTTCOMM_EXIST_SESS, /* Session name already exist */
102 LTTCOMM_NO_EVENT, /* No event found */
103 LTTCOMM_KERN_NA, /* Kernel tracer unavalable */
104 LTTCOMM_KERN_SESS_FAIL, /* Kernel create session failed */
105 LTTCOMM_KERN_CHAN_FAIL, /* Kernel create channel failed */
106 KCONSUMERD_COMMAND_SOCK_READY, /* when kconsumerd command socket ready */
107 KCONSUMERD_SUCCESS_RECV_FD, /* success on receiving fds */
108 KCONSUMERD_ERROR_RECV_FD, /* error on receiving fds */
109 KCONSUMERD_POLL_ERROR, /* Error in polling thread in kconsumerd */
110 KCONSUMERD_POLL_NVAL, /* Poll on closed fd */
111 KCONSUMERD_POLL_HUP, /* All fds have hungup */
112 KCONSUMERD_EXIT_SUCCESS, /* kconsumerd exiting normally */
113 KCONSUMERD_EXIT_FAILURE, /* kconsumerd exiting on error */
114 KCONSUMERD_OUTFD_ERROR, /* error opening the tracefile */
115 KCONSUMERD_SPLICE_EBADF, /* EBADF from splice(2) */
116 KCONSUMERD_SPLICE_EINVAL, /* EINVAL from splice(2) */
117 KCONSUMERD_SPLICE_ENOMEM, /* ENOMEM from splice(2) */
118 KCONSUMERD_SPLICE_ESPIPE, /* ESPIPE from splice(2) */
119 /* MUST be last element */
120 LTTCOMM_NR, /* Last element */
121 };
122
123 /* commands for kconsumerd */
124 enum lttcomm_consumerd_command {
125 LTTCOMM_ADD_STREAM = 1100,
126 LTTCOMM_UPDATE_STREAM, /* pause, delete, start depending on fd state */
127 LTTCOMM_STOP, /* delete all */
128 };
129
130 /* state of each fd in consumerd */
131 enum lttcomm_kconsumerd_fd_state {
132 ACTIVE_FD,
133 PAUSE_FD,
134 DELETE_FD,
135 };
136
137 /*
138 * Data structure received from lttng client to session daemon.
139 */
140 struct lttcomm_session_msg {
141 u32 cmd_type; /* enum lttcomm_sessiond_command */
142 uuid_t session_uuid;
143 char trace_name[NAME_MAX];
144 char session_name[NAME_MAX];
145 u32 pid; /* pid_t */
146 union {
147 struct {
148 int auto_session;
149 } create_session;
150 /* Marker data */
151 struct {
152 char event_name[NAME_MAX];
153 } event;
154 } u;
155 };
156
157 /*
158 * Data structure for the response from sessiond to the lttng client.
159 */
160 struct lttcomm_lttng_msg {
161 u32 cmd_type; /* enum lttcomm_sessiond_command */
162 u32 ret_code; /* enum lttcomm_return_code */
163 u32 pid; /* pid_t */
164 u32 trace_name_offset;
165 u32 data_size;
166 uuid_t session_uuid;
167 /* Contains: trace_name + data */
168 char payload[];
169 };
170
171 /*
172 * Data structures for the kconsumerd communications
173 *
174 * The header structure is sent to the kconsumerd daemon to inform
175 * how many lttcomm_kconsumerd_msg it is about to receive
176 */
177 struct lttcomm_kconsumerd_header {
178 u32 payload_size;
179 u32 cmd_type; /* enum lttcomm_consumerd_command */
180 u32 ret_code; /* enum lttcomm_return_code */
181 };
182
183 /* lttcomm_kconsumerd_msg represents a file descriptor to consume the
184 * data and a path name to write it
185 */
186 struct lttcomm_kconsumerd_msg {
187 char path_name[PATH_MAX];
188 int fd;
189 u32 state; /* enum lttcomm_kconsumerd_fd_state */
190 unsigned long max_sb_size; /* the subbuffer size for this channel */
191 };
192
193 extern int lttcomm_create_unix_sock(const char *pathname);
194 extern int lttcomm_connect_unix_sock(const char *pathname);
195 extern int lttcomm_accept_unix_sock(int sock);
196 extern int lttcomm_listen_unix_sock(int sock);
197 extern int lttcomm_close_unix_sock(int sock);
198 extern ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len);
199 extern ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len);
200 extern const char *lttcomm_get_readable_code(enum lttcomm_return_code code);
201
202 #endif /* _LIBLTTSESSIONDCOMM_H */
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