code.delx.au - pulseaudio/blob - src/utils/pacmd.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <assert.h>
  27 #include <signal.h>
  28 #include <sys/socket.h>
  29 #include <unistd.h>
  30 #include <errno.h>
  31 #include <string.h>
  32 #include <sys/un.h>
  33 #include <locale.h>
  34
  35 #include <pulse/util.h>
  36 #include <pulse/xmalloc.h>
  37
  38 #include <pulsecore/i18n.h>
  39 #include <pulsecore/poll.h>
  40 #include <pulsecore/macro.h>
  41 #include <pulsecore/core-util.h>
  42 #include <pulsecore/log.h>
  43 #include <pulsecore/pid.h>
  44
  45 int main(int argc, char*argv[]) {
  46     pid_t pid;
  47     int fd = -1;
  48     int ret = 1, i;
  49     struct sockaddr_un sa;
  50     char *ibuf = NULL;
  51     char *obuf = NULL;
  52     size_t buf_size, ibuf_size, ibuf_index, ibuf_length, obuf_size, obuf_index, obuf_length;
  53     char *cli;
  54     pa_bool_t ibuf_eof, obuf_eof, ibuf_closed, obuf_closed;
  55     struct pollfd pollfd[3];
  56     struct pollfd *watch_socket, *watch_stdin, *watch_stdout;
  57
  58     int stdin_type = 0, stdout_type = 0, fd_type = 0;
  59
  60     setlocale(LC_ALL, "");
  61 #ifdef ENABLE_NLS
  62     bindtextdomain(GETTEXT_PACKAGE, PULSE_LOCALEDIR);
  63 #endif
  64
  65     if (pa_pid_file_check_running(&pid, "pulseaudio") < 0) {
  66         pa_log(_("No PulseAudio daemon running, or not running as session daemon."));
  67         goto fail;
  68     }
  69
  70     if ((fd = pa_socket_cloexec(PF_UNIX, SOCK_STREAM, 0)) < 0) {
  71         pa_log(_("socket(PF_UNIX, SOCK_STREAM, 0): %s"), strerror(errno));
  72         goto fail;
  73     }
  74
  75     pa_zero(sa);
  76     sa.sun_family = AF_UNIX;
  77
  78     if (!(cli = pa_runtime_path("cli")))
  79         goto fail;
  80
  81     pa_strlcpy(sa.sun_path, cli, sizeof(sa.sun_path));
  82     pa_xfree(cli);
  83
  84     for (i = 0; i < 5; i++) {
  85         int r;
  86
  87         if ((r = connect(fd, (struct sockaddr*) &sa, sizeof(sa))) < 0 && (errno != ECONNREFUSED && errno != ENOENT)) {
  88             pa_log(_("connect(): %s"), strerror(errno));
  89             goto fail;
  90         }
  91
  92         if (r >= 0)
  93             break;
  94
  95         if (pa_pid_file_kill(SIGUSR2, NULL, "pulseaudio") < 0) {
  96             pa_log(_("Failed to kill PulseAudio daemon."));
  97             goto fail;
  98         }
  99
 100         pa_msleep(300);
 101     }
 102
 103     if (i >= 5) {
 104         pa_log(_("Daemon not responding."));
 105         goto fail;
 106     }
 107
 108     buf_size = pa_pipe_buf(fd);
 109     ibuf_size = PA_MIN(buf_size, pa_pipe_buf(STDIN_FILENO));
 110     ibuf = pa_xmalloc(ibuf_size);
 111     obuf_size = PA_MIN(buf_size, pa_pipe_buf(STDOUT_FILENO));
 112     obuf = pa_xmalloc(obuf_size);
 113     ibuf_index = ibuf_length = obuf_index = obuf_length = 0;
 114     ibuf_eof = obuf_eof = ibuf_closed = obuf_closed = FALSE;
 115
 116     if (argc > 1) {
 117         for (i = 1; i < argc; i++) {
 118             size_t k;
 119
 120             k = PA_MIN(ibuf_size - ibuf_length, strlen(argv[i]));
 121             memcpy(ibuf + ibuf_length, argv[i], k);
 122             ibuf_length += k;
 123
 124             if (ibuf_length < ibuf_size) {
 125                 ibuf[ibuf_length] = i < argc-1 ? ' ' : '\n';
 126                 ibuf_length++;
 127             }
 128         }
 129
 130         ibuf_eof = TRUE;
 131     }
 132
 133     for (;;) {
 134         struct pollfd *p;
 135
 136         if (ibuf_eof &&
 137             obuf_eof &&
 138             ibuf_length <= 0 &&
 139             obuf_length <= 0)
 140             break;
 141
 142         if (ibuf_length <= 0 && ibuf_eof && !ibuf_closed) {
 143             shutdown(fd, SHUT_WR);
 144             ibuf_closed = TRUE;
 145         }
 146
 147         if (obuf_length <= 0 && obuf_eof && !obuf_closed) {
 148             shutdown(fd, SHUT_RD);
 149             obuf_closed = TRUE;
 150         }
 151
 152         pa_zero(pollfd);
 153
 154         p = pollfd;
 155
 156         if (ibuf_length > 0 || (!obuf_eof && obuf_length <= 0)) {
 157             watch_socket = p++;
 158             watch_socket->fd = fd;
 159             watch_socket->events =
 160                 (ibuf_length > 0 ? POLLOUT : 0) |
 161                 (!obuf_eof && obuf_length <= 0 ? POLLIN : 0);
 162         } else
 163             watch_socket = NULL;
 164
 165         if (!ibuf_eof && ibuf_length <= 0) {
 166             watch_stdin = p++;
 167             watch_stdin->fd = STDIN_FILENO;
 168             watch_stdin->events = POLLIN;
 169         } else
 170             watch_stdin = NULL;
 171
 172         if (obuf_length > 0) {
 173             watch_stdout = p++;
 174             watch_stdout->fd = STDOUT_FILENO;
 175             watch_stdout->events = POLLOUT;
 176         } else
 177             watch_stdout = NULL;
 178
 179         if (pa_poll(pollfd, p-pollfd, -1) < 0) {
 180
 181             if (errno == EINTR)
 182                 continue;
 183
 184             pa_log(_("poll(): %s"), strerror(errno));
 185             goto fail;
 186         }
 187
 188         if (watch_stdin) {
 189             if (watch_stdin->revents & POLLIN) {
 190                 ssize_t r;
 191                 pa_assert(ibuf_length <= 0);
 192
 193                 if ((r = pa_read(STDIN_FILENO, ibuf, ibuf_size, &stdin_type)) <= 0) {
 194                     if (r < 0) {
 195                         pa_log(_("read(): %s"), strerror(errno));
 196                         goto fail;
 197                     }
 198
 199                     ibuf_eof = TRUE;
 200                 } else {
 201                     ibuf_length = (size_t) r;
 202                     ibuf_index = 0;
 203                 }
 204             } else if (watch_stdin->revents & POLLHUP)
 205                 ibuf_eof = TRUE;
 206         }
 207
 208         if (watch_socket) {
 209             if (watch_socket->revents & POLLIN) {
 210                 ssize_t r;
 211                 pa_assert(obuf_length <= 0);
 212
 213                 if ((r = pa_read(fd, obuf, obuf_size, &fd_type)) <= 0) {
 214                     if (r < 0) {
 215                         pa_log(_("read(): %s"), strerror(errno));
 216                         goto fail;
 217                     }
 218
 219                     obuf_eof = TRUE;
 220                 } else {
 221                     obuf_length = (size_t) r;
 222                     obuf_index = 0;
 223                 }
 224             } else if (watch_socket->revents & POLLHUP)
 225                 obuf_eof = TRUE;
 226         }
 227
 228         if (watch_stdout) {
 229             if (watch_stdout->revents & POLLHUP) {
 230                 obuf_eof = TRUE;
 231                 obuf_length = 0;
 232             } else if (watch_stdout->revents & POLLOUT) {
 233                 ssize_t r;
 234                 pa_assert(obuf_length > 0);
 235
 236                 if ((r = pa_write(STDOUT_FILENO, obuf + obuf_index, obuf_length, &stdout_type)) < 0) {
 237                     pa_log(_("write(): %s"), strerror(errno));
 238                     goto fail;
 239                 }
 240
 241                 obuf_length -= (size_t) r;
 242                 obuf_index += obuf_index;
 243             }
 244         }
 245
 246         if (watch_socket) {
 247             if (watch_socket->revents & POLLHUP) {
 248                 ibuf_eof = TRUE;
 249                 ibuf_length = 0;
 250             } if (watch_socket->revents & POLLOUT) {
 251                 ssize_t r;
 252                 pa_assert(ibuf_length > 0);
 253
 254                 if ((r = pa_write(fd, ibuf + ibuf_index, ibuf_length, &fd_type)) < 0) {
 255                     pa_log(_("write(): %s"), strerror(errno));
 256                     goto fail;
 257                 }
 258
 259                 ibuf_length -= (size_t) r;
 260                 ibuf_index += obuf_index;
 261             }
 262         }
 263     }
 264
 265     ret = 0;
 266
 267 fail:
 268     if (fd >= 0)
 269         pa_close(fd);
 270
 271     pa_xfree(obuf);
 272     pa_xfree(ibuf);
 273
 274     return ret;
 275 }