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1 | /* |
2 | * This file is part of Disobedience | |
9efa107e | 3 | * Copyright (C) 2007-2010 Richard Kettlewell |
a99c4e9a | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
a99c4e9a | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
a99c4e9a RK |
8 | * (at your option) any later version. |
9 | * | |
e7eb3a27 RK |
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 | * | |
a99c4e9a | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
a99c4e9a RK |
17 | */ |
18 | /** @file disobedience/rtp.c | |
19 | * @brief RTP player support for Disobedience | |
20 | */ | |
21 | ||
22 | #include "disobedience.h" | |
9fbe0996 | 23 | #include <sys/types.h> |
a99c4e9a RK |
24 | #include <sys/stat.h> |
25 | #include <unistd.h> | |
26 | #include <fcntl.h> | |
27 | #include <sys/un.h> | |
c764e004 | 28 | #include <sys/utsname.h> |
9fbe0996 | 29 | #include <sys/wait.h> |
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30 | |
31 | /** @brief Path to RTP player's control socket */ | |
32 | static char *rtp_socket; | |
33 | ||
34 | /** @brief Path to RTP player's logfile */ | |
35 | static char *rtp_log; | |
36 | ||
37 | /** @brief Initialize @ref rtp_socket and @ref rtp_log if necessary */ | |
38 | static void rtp_init(void) { | |
39 | if(!rtp_socket) { | |
40 | const char *home = getenv("HOME"); | |
c764e004 RK |
41 | char *dir, *base; |
42 | struct utsname uts; | |
a99c4e9a | 43 | |
c764e004 | 44 | byte_xasprintf(&dir, "%s/.disorder/", home); |
a99c4e9a | 45 | mkdir(dir, 02700); |
c764e004 RK |
46 | if(uname(&uts) < 0) |
47 | byte_xasprintf(&base, "%s/", dir); | |
48 | else | |
49 | byte_xasprintf(&base, "%s/%s-", dir, uts.nodename); | |
50 | byte_xasprintf(&rtp_socket, "%srtp", base); | |
51 | byte_xasprintf(&rtp_log, "%srtp.log", base); | |
a99c4e9a RK |
52 | } |
53 | } | |
54 | ||
55 | /** @brief Return a connection to the RTP player's control socket */ | |
56 | static FILE *rtp_connect(void) { | |
57 | struct sockaddr_un un; | |
58 | int fd; | |
59 | FILE *fp; | |
60 | ||
61 | rtp_init(); | |
62 | memset(&un, 0, sizeof un); | |
63 | un.sun_family = AF_UNIX; | |
64 | strcpy(un.sun_path, rtp_socket); | |
65 | fd = xsocket(PF_UNIX, SOCK_STREAM, 0); | |
66 | if(connect(fd, (const struct sockaddr *)&un, sizeof un) < 0) { | |
67 | /* Connection refused just means that the player quit without deleting its | |
68 | * socket */ | |
69 | switch(errno) { | |
70 | case ECONNREFUSED: | |
71 | case ENOENT: | |
72 | break; | |
73 | default: | |
74 | /* Anything else may be a problem */ | |
75 | fpopup_msg(GTK_MESSAGE_ERROR, "connecting to %s: %s", | |
76 | rtp_socket, strerror(errno)); | |
77 | break; | |
78 | } | |
79 | close(fd); | |
80 | return 0; | |
81 | } | |
82 | if(!(fp = fdopen(fd, "r+"))) { | |
83 | fpopup_msg(GTK_MESSAGE_ERROR, "error calling fdopen: %s", strerror(errno)); | |
84 | close(fd); | |
85 | return 0; | |
86 | } | |
87 | return fp; | |
88 | } | |
89 | ||
90 | /** @brief Return non-0 iff the RTP player is running */ | |
91 | int rtp_running(void) { | |
92 | FILE *fp = rtp_connect(); | |
93 | ||
94 | if(!fp) | |
95 | return 0; /* no connection -> not running */ | |
96 | fclose(fp); /* connection -> running */ | |
97 | return 1; | |
98 | } | |
99 | ||
100 | /** @brief Activate the RTP player if it is not running */ | |
101 | void start_rtp(void) { | |
102 | pid_t pid; | |
103 | int w, fd; | |
104 | ||
105 | if(rtp_running()) | |
106 | return; /* already running */ | |
107 | /* double-fork so we don't have to wait() later */ | |
108 | if(!(pid = xfork())) { | |
109 | if(setsid() < 0) | |
2e9ba080 | 110 | disorder_fatal(errno, "error calling setsid"); |
9efa107e | 111 | if(!xfork()) { |
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112 | /* grandchild */ |
113 | exitfn = _exit; | |
114 | /* log errors and output somewhere reasonably sane. rtp_running() | |
115 | * will have made sure the directory exists. */ | |
116 | if((fd = open(rtp_log, O_WRONLY|O_CREAT|O_TRUNC, 0600)) < 0) | |
2e9ba080 | 117 | disorder_fatal(errno, "creating %s", rtp_log); |
a99c4e9a RK |
118 | if(dup2(fd, 1) < 0 |
119 | || dup2(fd, 2) < 0) | |
2e9ba080 | 120 | disorder_fatal(errno, "dup2"); |
a99c4e9a | 121 | if(close(fd) < 0) |
2e9ba080 | 122 | disorder_fatal(errno, "close"); |
a99c4e9a RK |
123 | /* We don't want to hang onto whatever stdin was */ |
124 | if((fd = open("/dev/null", O_RDONLY)) < 0) | |
2e9ba080 | 125 | disorder_fatal(errno, "opening /dev/null"); |
a99c4e9a | 126 | if(dup2(fd, 0) < 0) |
2e9ba080 | 127 | disorder_fatal(errno, "dup2"); |
a99c4e9a | 128 | if(close(fd) < 0) |
2e9ba080 | 129 | disorder_fatal(errno, "close"); |
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130 | /* execute the player */ |
131 | execlp("disorder-playrtp", | |
132 | "disorder-playrtp", "--socket", rtp_socket, (char *)0); | |
2e9ba080 | 133 | disorder_fatal(errno, "disorder-playrtp"); |
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134 | } else { |
135 | /* child */ | |
136 | _exit(0); | |
137 | } | |
138 | } else { | |
139 | /* parent */ | |
140 | while(waitpid(pid, &w, 0) < 0 && errno == EINTR) | |
141 | ; | |
142 | } | |
143 | } | |
144 | ||
145 | /** @brief Stop the RTP player if it is running */ | |
146 | void stop_rtp(void) { | |
147 | FILE *fp = rtp_connect(); | |
148 | ||
149 | if(!fp) | |
150 | return; /* already stopped */ | |
151 | fprintf(fp, "stop\n"); | |
152 | fclose(fp); | |
153 | } | |
154 | ||
155 | /* | |
156 | Local Variables: | |
157 | c-basic-offset:2 | |
158 | comment-column:40 | |
159 | fill-column:79 | |
160 | indent-tabs-mode:nil | |
161 | End: | |
162 | */ |