| 1 | /* |
| 2 | * This file is part of Disobedience |
| 3 | * Copyright (C) 2007-2010 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 3 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, |
| 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 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | /** @file disobedience/rtp.c |
| 19 | * @brief RTP player support for Disobedience |
| 20 | */ |
| 21 | |
| 22 | #include "disobedience.h" |
| 23 | #include <sys/types.h> |
| 24 | #include <sys/stat.h> |
| 25 | #include <unistd.h> |
| 26 | #include <fcntl.h> |
| 27 | #include <sys/un.h> |
| 28 | #include <sys/utsname.h> |
| 29 | #include <sys/wait.h> |
| 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"); |
| 41 | char *dir, *base; |
| 42 | struct utsname uts; |
| 43 | |
| 44 | byte_xasprintf(&dir, "%s/.disorder/", home); |
| 45 | mkdir(dir, 02700); |
| 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); |
| 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) |
| 110 | disorder_fatal(errno, "error calling setsid"); |
| 111 | if(!xfork()) { |
| 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) |
| 117 | disorder_fatal(errno, "creating %s", rtp_log); |
| 118 | if(dup2(fd, 1) < 0 |
| 119 | || dup2(fd, 2) < 0) |
| 120 | disorder_fatal(errno, "dup2"); |
| 121 | if(close(fd) < 0) |
| 122 | disorder_fatal(errno, "close"); |
| 123 | /* We don't want to hang onto whatever stdin was */ |
| 124 | if((fd = open("/dev/null", O_RDONLY)) < 0) |
| 125 | disorder_fatal(errno, "opening /dev/null"); |
| 126 | if(dup2(fd, 0) < 0) |
| 127 | disorder_fatal(errno, "dup2"); |
| 128 | if(close(fd) < 0) |
| 129 | disorder_fatal(errno, "close"); |
| 130 | /* execute the player */ |
| 131 | execlp("disorder-playrtp", |
| 132 | "disorder-playrtp", |
| 133 | "--socket", rtp_socket, |
| 134 | "--api", rtp_api, |
| 135 | (char *)0); |
| 136 | disorder_fatal(errno, "disorder-playrtp"); |
| 137 | } else { |
| 138 | /* child */ |
| 139 | _exit(0); |
| 140 | } |
| 141 | } else { |
| 142 | /* parent */ |
| 143 | while(waitpid(pid, &w, 0) < 0 && errno == EINTR) |
| 144 | ; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | /** @brief Stop the RTP player if it is running */ |
| 149 | void stop_rtp(void) { |
| 150 | FILE *fp = rtp_connect(); |
| 151 | |
| 152 | if(!fp) |
| 153 | return; /* already stopped */ |
| 154 | fprintf(fp, "stop\n"); |
| 155 | fclose(fp); |
| 156 | } |
| 157 | |
| 158 | static char *rtp_config_file(void) { |
| 159 | static char *rtp_config; |
| 160 | const char *home = getenv("HOME"); |
| 161 | if(!rtp_config) |
| 162 | byte_xasprintf(&rtp_config, "%s/.disorder/api", home); |
| 163 | return rtp_config; |
| 164 | } |
| 165 | |
| 166 | const char *rtp_api; |
| 167 | |
| 168 | void load_rtp_config(void) { |
| 169 | char *rtp_config = rtp_config_file(); |
| 170 | FILE *fp; |
| 171 | if((fp = fopen(rtp_config, "r"))) { |
| 172 | char *line; |
| 173 | if(inputline(rtp_config, fp, &line, '\n') == 0) { |
| 174 | for(int n = 0; uaudio_apis[n]; ++n) |
| 175 | if(!strcmp(uaudio_apis[n]->name, line)) |
| 176 | rtp_api = line; |
| 177 | } |
| 178 | fclose(fp); |
| 179 | } |
| 180 | if(!rtp_api) |
| 181 | rtp_api = uaudio_default(uaudio_apis, UAUDIO_API_CLIENT)->name; |
| 182 | } |
| 183 | |
| 184 | void save_rtp_config(void) { |
| 185 | if(rtp_api) { |
| 186 | char *rtp_config = rtp_config_file(); |
| 187 | char *tmp; |
| 188 | byte_xasprintf(&tmp, "%s.tmp", rtp_config); |
| 189 | FILE *fp; |
| 190 | if(!(fp = fopen(tmp, "w"))){ |
| 191 | fpopup_msg(GTK_MESSAGE_ERROR, "error opening %s: %s", |
| 192 | tmp, strerror(errno)); |
| 193 | return; |
| 194 | } |
| 195 | if(fprintf(fp, "%s\n", rtp_api) < 0) { |
| 196 | fpopup_msg(GTK_MESSAGE_ERROR, "error writing to %s: %s", |
| 197 | tmp, strerror(errno)); |
| 198 | fclose(fp); |
| 199 | return; |
| 200 | } |
| 201 | if(fclose(fp) < 0) { |
| 202 | fpopup_msg(GTK_MESSAGE_ERROR, "error closing %s: %s", |
| 203 | tmp, strerror(errno)); |
| 204 | return; |
| 205 | } |
| 206 | if(rename(tmp, rtp_config) < 0) { |
| 207 | fpopup_msg(GTK_MESSAGE_ERROR, "error renaming %s: %s", |
| 208 | tmp, strerror(errno)); |
| 209 | } |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | void change_rtp_api(const char *api) { |
| 214 | if(rtp_api && !strcmp(api, rtp_api)) |
| 215 | return; /* no change */ |
| 216 | int running = rtp_running(); |
| 217 | if(running) |
| 218 | stop_rtp(); |
| 219 | rtp_api = api; |
| 220 | save_rtp_config(); |
| 221 | // TODO this is racy and does not work; the player doesn't shut down quickly |
| 222 | // enough. |
| 223 | if(running) |
| 224 | start_rtp(); |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | Local Variables: |
| 229 | c-basic-offset:2 |
| 230 | comment-column:40 |
| 231 | fill-column:79 |
| 232 | indent-tabs-mode:nil |
| 233 | End: |
| 234 | */ |