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a99c4e9a RK |
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> |
a99c4e9a RK |
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 | ||
af21fb6b MW |
100 | int rtp_getvol(int *l, int *r) { |
101 | FILE *fp; | |
102 | int rc = -1; | |
103 | ||
104 | fp = rtp_connect(); if(!fp) goto end; | |
105 | fprintf(fp, "getvol\n"); fflush(fp); | |
106 | if(fscanf(fp, "%d %d\n", l, r) != 2) goto end; | |
107 | rc = 0; | |
108 | end: | |
109 | if(fp) fclose(fp); | |
110 | return rc; | |
111 | } | |
112 | ||
113 | int rtp_setvol(int *l, int *r) { | |
114 | FILE *fp = rtp_connect(); if(!fp) return -1; | |
115 | fprintf(fp, "setvol %d %d\n", *l, *r); fflush(fp); | |
116 | if(fscanf(fp, "%d %d\n", l, r) != 2) { /* do nothing */ } | |
117 | fclose(fp); | |
118 | return 0; | |
119 | } | |
120 | ||
a99c4e9a RK |
121 | /** @brief Activate the RTP player if it is not running */ |
122 | void start_rtp(void) { | |
123 | pid_t pid; | |
124 | int w, fd; | |
125 | ||
126 | if(rtp_running()) | |
127 | return; /* already running */ | |
128 | /* double-fork so we don't have to wait() later */ | |
129 | if(!(pid = xfork())) { | |
130 | if(setsid() < 0) | |
2e9ba080 | 131 | disorder_fatal(errno, "error calling setsid"); |
9efa107e | 132 | if(!xfork()) { |
a99c4e9a RK |
133 | /* grandchild */ |
134 | exitfn = _exit; | |
135 | /* log errors and output somewhere reasonably sane. rtp_running() | |
136 | * will have made sure the directory exists. */ | |
137 | if((fd = open(rtp_log, O_WRONLY|O_CREAT|O_TRUNC, 0600)) < 0) | |
2e9ba080 | 138 | disorder_fatal(errno, "creating %s", rtp_log); |
a99c4e9a RK |
139 | if(dup2(fd, 1) < 0 |
140 | || dup2(fd, 2) < 0) | |
2e9ba080 | 141 | disorder_fatal(errno, "dup2"); |
a99c4e9a | 142 | if(close(fd) < 0) |
2e9ba080 | 143 | disorder_fatal(errno, "close"); |
a99c4e9a RK |
144 | /* We don't want to hang onto whatever stdin was */ |
145 | if((fd = open("/dev/null", O_RDONLY)) < 0) | |
2e9ba080 | 146 | disorder_fatal(errno, "opening /dev/null"); |
a99c4e9a | 147 | if(dup2(fd, 0) < 0) |
2e9ba080 | 148 | disorder_fatal(errno, "dup2"); |
a99c4e9a | 149 | if(close(fd) < 0) |
2e9ba080 | 150 | disorder_fatal(errno, "close"); |
a99c4e9a RK |
151 | /* execute the player */ |
152 | execlp("disorder-playrtp", | |
a2364abb RK |
153 | "disorder-playrtp", |
154 | "--socket", rtp_socket, | |
155 | "--api", rtp_api, | |
156 | (char *)0); | |
2e9ba080 | 157 | disorder_fatal(errno, "disorder-playrtp"); |
a99c4e9a RK |
158 | } else { |
159 | /* child */ | |
160 | _exit(0); | |
161 | } | |
162 | } else { | |
163 | /* parent */ | |
164 | while(waitpid(pid, &w, 0) < 0 && errno == EINTR) | |
165 | ; | |
166 | } | |
167 | } | |
168 | ||
169 | /** @brief Stop the RTP player if it is running */ | |
170 | void stop_rtp(void) { | |
171 | FILE *fp = rtp_connect(); | |
172 | ||
173 | if(!fp) | |
174 | return; /* already stopped */ | |
175 | fprintf(fp, "stop\n"); | |
176 | fclose(fp); | |
177 | } | |
178 | ||
a2364abb RK |
179 | static char *rtp_config_file(void) { |
180 | static char *rtp_config; | |
181 | const char *home = getenv("HOME"); | |
182 | if(!rtp_config) | |
183 | byte_xasprintf(&rtp_config, "%s/.disorder/api", home); | |
184 | return rtp_config; | |
185 | } | |
186 | ||
187 | const char *rtp_api; | |
188 | ||
189 | void load_rtp_config(void) { | |
190 | char *rtp_config = rtp_config_file(); | |
191 | FILE *fp; | |
192 | if((fp = fopen(rtp_config, "r"))) { | |
193 | char *line; | |
194 | if(inputline(rtp_config, fp, &line, '\n') == 0) { | |
195 | for(int n = 0; uaudio_apis[n]; ++n) | |
196 | if(!strcmp(uaudio_apis[n]->name, line)) | |
197 | rtp_api = line; | |
198 | } | |
199 | fclose(fp); | |
200 | } | |
201 | if(!rtp_api) | |
202 | rtp_api = uaudio_default(uaudio_apis, UAUDIO_API_CLIENT)->name; | |
203 | } | |
204 | ||
205 | void save_rtp_config(void) { | |
206 | if(rtp_api) { | |
207 | char *rtp_config = rtp_config_file(); | |
208 | char *tmp; | |
209 | byte_xasprintf(&tmp, "%s.tmp", rtp_config); | |
210 | FILE *fp; | |
211 | if(!(fp = fopen(tmp, "w"))){ | |
212 | fpopup_msg(GTK_MESSAGE_ERROR, "error opening %s: %s", | |
213 | tmp, strerror(errno)); | |
214 | return; | |
215 | } | |
216 | if(fprintf(fp, "%s\n", rtp_api) < 0) { | |
217 | fpopup_msg(GTK_MESSAGE_ERROR, "error writing to %s: %s", | |
218 | tmp, strerror(errno)); | |
219 | fclose(fp); | |
220 | return; | |
221 | } | |
222 | if(fclose(fp) < 0) { | |
223 | fpopup_msg(GTK_MESSAGE_ERROR, "error closing %s: %s", | |
224 | tmp, strerror(errno)); | |
225 | return; | |
226 | } | |
227 | if(rename(tmp, rtp_config) < 0) { | |
228 | fpopup_msg(GTK_MESSAGE_ERROR, "error renaming %s: %s", | |
229 | tmp, strerror(errno)); | |
230 | } | |
231 | } | |
232 | } | |
233 | ||
234 | void change_rtp_api(const char *api) { | |
235 | if(rtp_api && !strcmp(api, rtp_api)) | |
236 | return; /* no change */ | |
237 | int running = rtp_running(); | |
238 | if(running) | |
239 | stop_rtp(); | |
240 | rtp_api = api; | |
241 | save_rtp_config(); | |
242 | // TODO this is racy and does not work; the player doesn't shut down quickly | |
243 | // enough. | |
244 | if(running) | |
245 | start_rtp(); | |
246 | } | |
247 | ||
a99c4e9a RK |
248 | /* |
249 | Local Variables: | |
250 | c-basic-offset:2 | |
251 | comment-column:40 | |
252 | fill-column:79 | |
253 | indent-tabs-mode:nil | |
254 | End: | |
255 | */ |