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2691221a MD |
1 | /* |
2 | * lttng-ust-comm.c | |
3 | * | |
4 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> | |
5 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
6 | * | |
7 | * This library is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; only | |
10 | * version 2.1 of the License. | |
11 | * | |
12 | * This library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with this library; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include <sys/types.h> | |
23 | #include <sys/socket.h> | |
24 | #include <unistd.h> | |
25 | #include <errno.h> | |
26 | #include <lttng-sessiond-comm.h> | |
27 | #include <ust/usterr-signal-safe.h> | |
28 | ||
29 | /* Socket from app (connect) to session daemon (listen) for communication */ | |
30 | static int global_apps_socket = -1; | |
31 | static char global_apps_sock_path[PATH_MAX] = DEFAULT_GLOBAL_APPS_UNIX_SOCK; | |
32 | ||
33 | /* TODO: allow global_apps_sock_path override */ | |
34 | ||
35 | static int local_apps_socket = -1; | |
36 | static char local_apps_sock_path[PATH_MAX]; | |
37 | ||
38 | static | |
39 | int connect_global_apps_socket(void) | |
40 | { | |
41 | int ret; | |
42 | ||
43 | ret = lttcomm_connect_unix_sock(global_apps_sock_path); | |
44 | if (ret < 0) | |
45 | return ret; | |
46 | global_apps_socket = ret; | |
47 | ||
48 | return 0; | |
49 | } | |
50 | ||
51 | static | |
52 | int connect_local_apps_socket(void) | |
53 | { | |
54 | const char *home_dir; | |
55 | int ret; | |
56 | ||
57 | home_dir = (const char *) getenv("HOME"); | |
58 | if (!home_dir) | |
59 | return -ENOENT; | |
60 | snprintf(local_apps_sock_path, PATH_MAX, | |
61 | DEFAULT_HOME_APPS_UNIX_SOCK, home_dir); | |
62 | ||
63 | ret = lttcomm_connect_unix_sock(local_apps_sock_path); | |
64 | if (ret < 0) | |
65 | return ret; | |
66 | local_apps_socket = ret; | |
67 | ||
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | static | |
73 | int register_app_to_sessiond(int socket) | |
74 | { | |
75 | ssize_t ret; | |
76 | struct { | |
77 | pid_t pid; | |
78 | uid_t uid; | |
79 | } reg_msg; | |
80 | ||
81 | reg_msg.pid = getpid(); | |
82 | reg_msg.uid = getuid(); | |
83 | ||
84 | ret = lttcomm_send_unix_sock(socket, ®_msg, sizeof(reg_msg)); | |
85 | if (ret >= 0 && ret != sizeof(reg_msg)) | |
86 | return -EIO; | |
87 | return ret; | |
88 | } | |
89 | ||
90 | /* | |
91 | * sessiond monitoring thread: monitor presence of global and per-user | |
92 | * sessiond by polling the application common named pipe. | |
93 | */ | |
94 | /* TODO */ | |
95 | ||
96 | void __attribute__((constructor)) lttng_ust_comm_init(void) | |
97 | { | |
98 | int ret; | |
99 | ||
100 | init_usterr(); | |
101 | ||
102 | #if 0 | |
103 | /* Connect to the global sessiond apps socket */ | |
104 | ret = connect_global_apps_socket(); | |
105 | if (ret) { | |
106 | ERR("Error connecting to global apps socket"); | |
107 | } | |
108 | #endif //0 | |
109 | ||
110 | /* Connect to the per-user (local) sessiond apps socket */ | |
111 | ret = connect_local_apps_socket(); | |
112 | if (ret) { | |
113 | ERR("Error connecting to local apps socket"); | |
114 | } | |
115 | ||
116 | if (global_apps_socket >= 0) { | |
117 | ret = register_app_to_sessiond(global_apps_socket); | |
118 | if (ret < 0) { | |
119 | ERR("Error registering app to global apps socket"); | |
120 | } | |
121 | } | |
122 | if (local_apps_socket >= 0) { | |
123 | ret = register_app_to_sessiond(local_apps_socket); | |
124 | if (ret < 0) { | |
125 | ERR("Error registering app to local apps socket"); | |
126 | } | |
127 | } | |
128 | } | |
129 | ||
130 | void __attribute__((destructor)) lttng_ust_comm_exit(void) | |
131 | { | |
132 | int ret; | |
133 | ||
134 | #if 0 | |
135 | ERR("dest %d", global_apps_socket); | |
136 | if (global_apps_socket >= 0) { | |
137 | ret = unregister_app_to_sessiond(global_apps_socket); | |
138 | if (ret < 0) { | |
139 | ERR("Error registering app to global apps socket"); | |
140 | } | |
141 | ret = close(global_apps_socket); | |
142 | if (ret) { | |
143 | ERR("Error closing global apps socket"); | |
144 | } | |
145 | } | |
146 | #endif | |
147 | if (local_apps_socket >= 0) { | |
148 | ret = close(local_apps_socket); | |
149 | if (ret) { | |
150 | ERR("Error closing local apps socket"); | |
151 | } | |
152 | } | |
153 | } |