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a99c4e9a RK |
1 | /* |
2 | * This file is part of Disobedience | |
3 | * Copyright (C) 2007 Richard Kettlewell | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * 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 | |
18 | * USA | |
19 | */ | |
20 | /** @file disobedience/rtp.c | |
21 | * @brief RTP player support for Disobedience | |
22 | */ | |
23 | ||
24 | #include "disobedience.h" | |
9fbe0996 | 25 | #include <sys/types.h> |
a99c4e9a RK |
26 | #include <sys/stat.h> |
27 | #include <unistd.h> | |
28 | #include <fcntl.h> | |
29 | #include <sys/un.h> | |
c764e004 | 30 | #include <sys/utsname.h> |
9fbe0996 | 31 | #include <sys/wait.h> |
a99c4e9a RK |
32 | |
33 | /** @brief Path to RTP player's control socket */ | |
34 | static char *rtp_socket; | |
35 | ||
36 | /** @brief Path to RTP player's logfile */ | |
37 | static char *rtp_log; | |
38 | ||
39 | /** @brief Initialize @ref rtp_socket and @ref rtp_log if necessary */ | |
40 | static void rtp_init(void) { | |
41 | if(!rtp_socket) { | |
42 | const char *home = getenv("HOME"); | |
c764e004 RK |
43 | char *dir, *base; |
44 | struct utsname uts; | |
a99c4e9a | 45 | |
c764e004 | 46 | byte_xasprintf(&dir, "%s/.disorder/", home); |
a99c4e9a | 47 | mkdir(dir, 02700); |
c764e004 RK |
48 | if(uname(&uts) < 0) |
49 | byte_xasprintf(&base, "%s/", dir); | |
50 | else | |
51 | byte_xasprintf(&base, "%s/%s-", dir, uts.nodename); | |
52 | byte_xasprintf(&rtp_socket, "%srtp", base); | |
53 | byte_xasprintf(&rtp_log, "%srtp.log", base); | |
a99c4e9a RK |
54 | } |
55 | } | |
56 | ||
57 | /** @brief Return a connection to the RTP player's control socket */ | |
58 | static FILE *rtp_connect(void) { | |
59 | struct sockaddr_un un; | |
60 | int fd; | |
61 | FILE *fp; | |
62 | ||
63 | rtp_init(); | |
64 | memset(&un, 0, sizeof un); | |
65 | un.sun_family = AF_UNIX; | |
66 | strcpy(un.sun_path, rtp_socket); | |
67 | fd = xsocket(PF_UNIX, SOCK_STREAM, 0); | |
68 | if(connect(fd, (const struct sockaddr *)&un, sizeof un) < 0) { | |
69 | /* Connection refused just means that the player quit without deleting its | |
70 | * socket */ | |
71 | switch(errno) { | |
72 | case ECONNREFUSED: | |
73 | case ENOENT: | |
74 | break; | |
75 | default: | |
76 | /* Anything else may be a problem */ | |
77 | fpopup_msg(GTK_MESSAGE_ERROR, "connecting to %s: %s", | |
78 | rtp_socket, strerror(errno)); | |
79 | break; | |
80 | } | |
81 | close(fd); | |
82 | return 0; | |
83 | } | |
84 | if(!(fp = fdopen(fd, "r+"))) { | |
85 | fpopup_msg(GTK_MESSAGE_ERROR, "error calling fdopen: %s", strerror(errno)); | |
86 | close(fd); | |
87 | return 0; | |
88 | } | |
89 | return fp; | |
90 | } | |
91 | ||
92 | /** @brief Return non-0 iff the RTP player is running */ | |
93 | int rtp_running(void) { | |
94 | FILE *fp = rtp_connect(); | |
95 | ||
96 | if(!fp) | |
97 | return 0; /* no connection -> not running */ | |
98 | fclose(fp); /* connection -> running */ | |
99 | return 1; | |
100 | } | |
101 | ||
102 | /** @brief Activate the RTP player if it is not running */ | |
103 | void start_rtp(void) { | |
104 | pid_t pid; | |
105 | int w, fd; | |
106 | ||
107 | if(rtp_running()) | |
108 | return; /* already running */ | |
109 | /* double-fork so we don't have to wait() later */ | |
110 | if(!(pid = xfork())) { | |
111 | if(setsid() < 0) | |
112 | fatal(errno, "error calling setsid"); | |
113 | if(!(pid = xfork())) { | |
114 | /* grandchild */ | |
115 | exitfn = _exit; | |
116 | /* log errors and output somewhere reasonably sane. rtp_running() | |
117 | * will have made sure the directory exists. */ | |
118 | if((fd = open(rtp_log, O_WRONLY|O_CREAT|O_TRUNC, 0600)) < 0) | |
119 | fatal(errno, "creating %s", rtp_log); | |
120 | if(dup2(fd, 1) < 0 | |
121 | || dup2(fd, 2) < 0) | |
122 | fatal(errno, "dup2"); | |
123 | if(close(fd) < 0) | |
124 | fatal(errno, "close"); | |
125 | /* We don't want to hang onto whatever stdin was */ | |
126 | if((fd = open("/dev/null", O_RDONLY)) < 0) | |
127 | fatal(errno, "opening /dev/null"); | |
128 | if(dup2(fd, 0) < 0) | |
129 | fatal(errno, "dup2"); | |
130 | if(close(fd) < 0) | |
131 | fatal(errno, "close"); | |
132 | /* execute the player */ | |
133 | execlp("disorder-playrtp", | |
134 | "disorder-playrtp", "--socket", rtp_socket, (char *)0); | |
135 | fatal(errno, "disorder-playrtp"); | |
136 | } else { | |
137 | /* child */ | |
138 | _exit(0); | |
139 | } | |
140 | } else { | |
141 | /* parent */ | |
142 | while(waitpid(pid, &w, 0) < 0 && errno == EINTR) | |
143 | ; | |
144 | } | |
145 | } | |
146 | ||
147 | /** @brief Stop the RTP player if it is running */ | |
148 | void stop_rtp(void) { | |
149 | FILE *fp = rtp_connect(); | |
150 | ||
151 | if(!fp) | |
152 | return; /* already stopped */ | |
153 | fprintf(fp, "stop\n"); | |
154 | fclose(fp); | |
155 | } | |
156 | ||
157 | /* | |
158 | Local Variables: | |
159 | c-basic-offset:2 | |
160 | comment-column:40 | |
161 | fill-column:79 | |
162 | indent-tabs-mode:nil | |
163 | End: | |
164 | */ |