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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 | ||
53a4a6fd MW |
37 | static char *substitute_instance_name(void) { |
38 | const char *p = config->rtp_instance_name; | |
39 | struct utsname uts; | |
40 | size_t n; | |
41 | int ok; | |
42 | struct dynstr z; | |
43 | ||
44 | ok = (uname(&uts) >= 0); | |
45 | if(!p) p = "%h-rtp"; | |
46 | dynstr_init(&z); | |
47 | for(;;) { | |
48 | n = strcspn(p, "%"); | |
49 | if(n) { dynstr_append_bytes(&z, p, n); p += n; } | |
50 | if(!*p) break; | |
51 | p++; | |
52 | switch(*p) { | |
53 | case '%': dynstr_append_bytes(&z, "%", 1); p++; break; | |
54 | case 'h': | |
55 | if(ok) { dynstr_append_string(&z, uts.nodename); p++; } | |
56 | else { p++; if(*p) p++; } | |
57 | case 0: break; | |
58 | default: dynstr_append_bytes(&z, p - 1, 2); p++; break; | |
59 | } | |
60 | } | |
61 | dynstr_terminate(&z); | |
62 | return z.vec; | |
63 | } | |
64 | ||
a99c4e9a RK |
65 | /** @brief Initialize @ref rtp_socket and @ref rtp_log if necessary */ |
66 | static void rtp_init(void) { | |
67 | if(!rtp_socket) { | |
68 | const char *home = getenv("HOME"); | |
53a4a6fd | 69 | char *dir, *instance; |
a99c4e9a | 70 | |
c764e004 | 71 | byte_xasprintf(&dir, "%s/.disorder/", home); |
a99c4e9a | 72 | mkdir(dir, 02700); |
53a4a6fd MW |
73 | instance = substitute_instance_name(); |
74 | byte_xasprintf(&rtp_socket, "%s%s", dir, instance); | |
75 | byte_xasprintf(&rtp_log, "%s%s.log", dir, instance); | |
a99c4e9a RK |
76 | } |
77 | } | |
78 | ||
79 | /** @brief Return a connection to the RTP player's control socket */ | |
80 | static FILE *rtp_connect(void) { | |
81 | struct sockaddr_un un; | |
82 | int fd; | |
83 | FILE *fp; | |
84 | ||
85 | rtp_init(); | |
86 | memset(&un, 0, sizeof un); | |
87 | un.sun_family = AF_UNIX; | |
88 | strcpy(un.sun_path, rtp_socket); | |
89 | fd = xsocket(PF_UNIX, SOCK_STREAM, 0); | |
90 | if(connect(fd, (const struct sockaddr *)&un, sizeof un) < 0) { | |
91 | /* Connection refused just means that the player quit without deleting its | |
92 | * socket */ | |
93 | switch(errno) { | |
94 | case ECONNREFUSED: | |
95 | case ENOENT: | |
96 | break; | |
97 | default: | |
98 | /* Anything else may be a problem */ | |
99 | fpopup_msg(GTK_MESSAGE_ERROR, "connecting to %s: %s", | |
100 | rtp_socket, strerror(errno)); | |
101 | break; | |
102 | } | |
103 | close(fd); | |
104 | return 0; | |
105 | } | |
106 | if(!(fp = fdopen(fd, "r+"))) { | |
107 | fpopup_msg(GTK_MESSAGE_ERROR, "error calling fdopen: %s", strerror(errno)); | |
108 | close(fd); | |
109 | return 0; | |
110 | } | |
111 | return fp; | |
112 | } | |
113 | ||
114 | /** @brief Return non-0 iff the RTP player is running */ | |
115 | int rtp_running(void) { | |
116 | FILE *fp = rtp_connect(); | |
117 | ||
118 | if(!fp) | |
119 | return 0; /* no connection -> not running */ | |
120 | fclose(fp); /* connection -> running */ | |
121 | return 1; | |
122 | } | |
123 | ||
af21fb6b MW |
124 | int rtp_getvol(int *l, int *r) { |
125 | FILE *fp; | |
126 | int rc = -1; | |
127 | ||
128 | fp = rtp_connect(); if(!fp) goto end; | |
129 | fprintf(fp, "getvol\n"); fflush(fp); | |
130 | if(fscanf(fp, "%d %d\n", l, r) != 2) goto end; | |
131 | rc = 0; | |
132 | end: | |
133 | if(fp) fclose(fp); | |
134 | return rc; | |
135 | } | |
136 | ||
137 | int rtp_setvol(int *l, int *r) { | |
138 | FILE *fp = rtp_connect(); if(!fp) return -1; | |
139 | fprintf(fp, "setvol %d %d\n", *l, *r); fflush(fp); | |
140 | if(fscanf(fp, "%d %d\n", l, r) != 2) { /* do nothing */ } | |
141 | fclose(fp); | |
142 | return 0; | |
143 | } | |
144 | ||
a99c4e9a RK |
145 | /** @brief Activate the RTP player if it is not running */ |
146 | void start_rtp(void) { | |
147 | pid_t pid; | |
148 | int w, fd; | |
149 | ||
150 | if(rtp_running()) | |
151 | return; /* already running */ | |
152 | /* double-fork so we don't have to wait() later */ | |
153 | if(!(pid = xfork())) { | |
154 | if(setsid() < 0) | |
2e9ba080 | 155 | disorder_fatal(errno, "error calling setsid"); |
9efa107e | 156 | if(!xfork()) { |
a99c4e9a RK |
157 | /* grandchild */ |
158 | exitfn = _exit; | |
159 | /* log errors and output somewhere reasonably sane. rtp_running() | |
160 | * will have made sure the directory exists. */ | |
161 | if((fd = open(rtp_log, O_WRONLY|O_CREAT|O_TRUNC, 0600)) < 0) | |
2e9ba080 | 162 | disorder_fatal(errno, "creating %s", rtp_log); |
a99c4e9a RK |
163 | if(dup2(fd, 1) < 0 |
164 | || dup2(fd, 2) < 0) | |
2e9ba080 | 165 | disorder_fatal(errno, "dup2"); |
a99c4e9a | 166 | if(close(fd) < 0) |
2e9ba080 | 167 | disorder_fatal(errno, "close"); |
a99c4e9a RK |
168 | /* We don't want to hang onto whatever stdin was */ |
169 | if((fd = open("/dev/null", O_RDONLY)) < 0) | |
2e9ba080 | 170 | disorder_fatal(errno, "opening /dev/null"); |
a99c4e9a | 171 | if(dup2(fd, 0) < 0) |
2e9ba080 | 172 | disorder_fatal(errno, "dup2"); |
a99c4e9a | 173 | if(close(fd) < 0) |
2e9ba080 | 174 | disorder_fatal(errno, "close"); |
a99c4e9a RK |
175 | /* execute the player */ |
176 | execlp("disorder-playrtp", | |
a2364abb RK |
177 | "disorder-playrtp", |
178 | "--socket", rtp_socket, | |
179 | "--api", rtp_api, | |
180 | (char *)0); | |
2e9ba080 | 181 | disorder_fatal(errno, "disorder-playrtp"); |
a99c4e9a RK |
182 | } else { |
183 | /* child */ | |
184 | _exit(0); | |
185 | } | |
186 | } else { | |
187 | /* parent */ | |
188 | while(waitpid(pid, &w, 0) < 0 && errno == EINTR) | |
189 | ; | |
190 | } | |
191 | } | |
192 | ||
193 | /** @brief Stop the RTP player if it is running */ | |
194 | void stop_rtp(void) { | |
195 | FILE *fp = rtp_connect(); | |
196 | ||
197 | if(!fp) | |
198 | return; /* already stopped */ | |
199 | fprintf(fp, "stop\n"); | |
200 | fclose(fp); | |
201 | } | |
202 | ||
a2364abb RK |
203 | static char *rtp_config_file(void) { |
204 | static char *rtp_config; | |
205 | const char *home = getenv("HOME"); | |
206 | if(!rtp_config) | |
207 | byte_xasprintf(&rtp_config, "%s/.disorder/api", home); | |
208 | return rtp_config; | |
209 | } | |
210 | ||
211 | const char *rtp_api; | |
212 | ||
213 | void load_rtp_config(void) { | |
214 | char *rtp_config = rtp_config_file(); | |
215 | FILE *fp; | |
216 | if((fp = fopen(rtp_config, "r"))) { | |
217 | char *line; | |
218 | if(inputline(rtp_config, fp, &line, '\n') == 0) { | |
219 | for(int n = 0; uaudio_apis[n]; ++n) | |
220 | if(!strcmp(uaudio_apis[n]->name, line)) | |
221 | rtp_api = line; | |
222 | } | |
223 | fclose(fp); | |
224 | } | |
225 | if(!rtp_api) | |
226 | rtp_api = uaudio_default(uaudio_apis, UAUDIO_API_CLIENT)->name; | |
227 | } | |
228 | ||
229 | void save_rtp_config(void) { | |
230 | if(rtp_api) { | |
231 | char *rtp_config = rtp_config_file(); | |
232 | char *tmp; | |
233 | byte_xasprintf(&tmp, "%s.tmp", rtp_config); | |
234 | FILE *fp; | |
235 | if(!(fp = fopen(tmp, "w"))){ | |
236 | fpopup_msg(GTK_MESSAGE_ERROR, "error opening %s: %s", | |
237 | tmp, strerror(errno)); | |
238 | return; | |
239 | } | |
240 | if(fprintf(fp, "%s\n", rtp_api) < 0) { | |
241 | fpopup_msg(GTK_MESSAGE_ERROR, "error writing to %s: %s", | |
242 | tmp, strerror(errno)); | |
243 | fclose(fp); | |
244 | return; | |
245 | } | |
246 | if(fclose(fp) < 0) { | |
247 | fpopup_msg(GTK_MESSAGE_ERROR, "error closing %s: %s", | |
248 | tmp, strerror(errno)); | |
249 | return; | |
250 | } | |
251 | if(rename(tmp, rtp_config) < 0) { | |
252 | fpopup_msg(GTK_MESSAGE_ERROR, "error renaming %s: %s", | |
253 | tmp, strerror(errno)); | |
254 | } | |
255 | } | |
256 | } | |
257 | ||
258 | void change_rtp_api(const char *api) { | |
259 | if(rtp_api && !strcmp(api, rtp_api)) | |
260 | return; /* no change */ | |
261 | int running = rtp_running(); | |
262 | if(running) | |
263 | stop_rtp(); | |
264 | rtp_api = api; | |
265 | save_rtp_config(); | |
266 | // TODO this is racy and does not work; the player doesn't shut down quickly | |
267 | // enough. | |
268 | if(running) | |
269 | start_rtp(); | |
270 | } | |
271 | ||
a99c4e9a RK |
272 | /* |
273 | Local Variables: | |
274 | c-basic-offset:2 | |
275 | comment-column:40 | |
276 | fill-column:79 | |
277 | indent-tabs-mode:nil | |
278 | End: | |
279 | */ |