Major changes for the daemon data transmission
[lttng-tools.git] / liblttsessiondcomm / liblttsessiondcomm.h
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1/* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
2 *
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU General Public License
5 * as published by the Free Software Foundation; either version 2
6 * of the License, or (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
16 *
17 */
18
19#ifndef _LIBLTTSESSIONDCOMM_H
20#define _LIBLTTSESSIONDCOMM_H
21
22#include <limits.h>
23#include <uuid/uuid.h>
24
25/* Default unix socket path */
26#define DEFAULT_GLOBAL_CLIENT_UNIX_SOCK "/tmp/client-ltt-sessiond"
27#define DEFAULT_GLOBAL_APPS_UNIX_SOCK "/tmp/apps-ltt-sessiond"
28#define DEFAULT_HOME_APPS_UNIX_SOCK "%s/.apps-ltt-sessiond"
29#define DEFAULT_HOME_CLIENT_UNIX_SOCK "%s/.client-ltt-sessiond"
30
31/* Queue size of listen(2) */
32#define MAX_LISTEN 10
33
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34/* Get the error code index from 0 since
35 * LTTCOMM_OK start at 1000
36 */
686204ab 37#define LTTCOMM_ERR_INDEX(code) (code - LTTCOMM_OK)
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38
39enum lttcomm_command_type {
40 LTTNG_CREATE_SESSION,
41 LTTNG_DESTROY_SESSION,
42 LTTNG_FORCE_SUBBUF_SWITCH,
43 LTTNG_GET_ALL_SESSION,
44 LTTNG_GET_SOCK_PATH,
45 LTTNG_GET_SUBBUF_NUM_SIZE,
46 LTTNG_LIST_MARKERS,
47 LTTNG_LIST_SESSIONS,
48 LTTNG_LIST_TRACE_EVENTS,
49 LTTNG_SETUP_TRACE,
50 LTTNG_SET_SOCK_PATH,
51 LTTNG_SET_SUBBUF_NUM,
52 LTTNG_SET_SUBBUF_SIZE,
53 UST_ALLOC_TRACE,
54 UST_CREATE_TRACE,
55 UST_DESTROY_TRACE,
56 UST_DISABLE_MARKER,
57 UST_ENABLE_MARKER,
58 UST_LIST_APPS,
59 UST_START_TRACE,
60 UST_STOP_TRACE,
61};
62
63/*
64 * lttcomm error code.
65 */
66enum lttcomm_return_code {
67 LTTCOMM_OK = 1000, /* Ok */
68 LTTCOMM_ERR, /* Unknown Error */
69 LTTCOMM_UND, /* Undefine command */
70 LTTCOMM_ALLOC_FAIL, /* Trace allocation fail */
71 LTTCOMM_NO_SESSION, /* No session found */
72 LTTCOMM_CREATE_FAIL, /* Create trace fail */
73 LTTCOMM_SESSION_FAIL, /* Create session fail */
74 LTTCOMM_START_FAIL, /* Start tracing fail */
75 LTTCOMM_LIST_FAIL, /* Listing apps fail */
e065084a 76 LTTCOMM_NO_APPS, /* No traceable application */
57167058 77 LTTCOMM_NO_SESS, /* No sessions available */
ca95a216 78 LTTCOMM_FATAL, /* Session daemon had a fatal error */
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79 LTTCOMM_NR, /* Last element */
80};
81
82/*
83 * Data structure for ltt-session received message
84 */
85struct lttcomm_session_msg {
86 /* Common data to almost all command */
87 enum lttcomm_command_type cmd_type;
88 uuid_t session_id;
89 char trace_name[NAME_MAX];
90 char session_name[NAME_MAX];
91 pid_t pid;
92 union {
93 struct {
94 int auto_session;
95 } create_session;
96 /* Marker data */
97 struct {
98 char channel[NAME_MAX];
99 char marker[NAME_MAX];
100 } marker;
101 /* SET_SOCK_PATH */
102 struct {
103 char sock_path[PATH_MAX];
104 } sock_path;
105 /* SET_SUBBUF_NUM */
106 struct {
107 unsigned int subbuf_num;
108 char channel[NAME_MAX];
109 } subbuf_num;
110 /* SET_SUBBUF_SIZE */
111 struct {
112 unsigned int subbuf_size;
113 char channel[NAME_MAX];
114 } subbuf_size;
115 } u;
116};
117
118/*
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119 * Data structure for the lttng client response.
120 *
121 * This data structure is the control struct use in
122 * the header of the transmission. NEVER put variable
123 * size data in here.
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124 */
125struct lttcomm_lttng_msg {
126 enum lttcomm_command_type cmd_type;
127 enum lttcomm_return_code ret_code;
128 uuid_t session_id;
129 pid_t pid;
130 char trace_name[NAME_MAX];
ca95a216 131 unsigned int size_payload;
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132};
133
134extern int lttcomm_create_unix_sock(const char *pathname);
135extern int lttcomm_connect_unix_sock(const char *pathname);
136extern int lttcomm_accept_unix_sock(int sock);
137extern int lttcomm_listen_unix_sock(int sock);
138extern ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len);
139extern ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len);
140extern const char *lttcomm_get_readable_code(enum lttcomm_return_code code);
141
142#endif /* _LIBLTTSESSIONDCOMM_H */
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