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/error.h>
  36 #include <pulse/util.h>
  37 #include <pulse/xmalloc.h>
  38 #include <pulse/i18n.h>
  39
  40 #include <pulsecore/poll.h>
  41 #include <pulsecore/macro.h>
  42 #include <pulsecore/core-util.h>
  43 #include <pulsecore/log.h>
  44 #include <pulsecore/pid.h>
  45
  46 int main(int argc, char*argv[]) {
  47     pid_t pid;
  48     int fd = -1;
  49     int ret = 1, i;
  50     struct sockaddr_un sa;
  51     char ibuf[PIPE_BUF], obuf[PIPE_BUF];
  52     size_t ibuf_index, ibuf_length, 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     bindtextdomain(GETTEXT_PACKAGE, PULSE_LOCALEDIR);
  62
  63     if (pa_pid_file_check_running(&pid, "pulseaudio") < 0) {
  64         pa_log(_("No PulseAudio daemon running, or not running as session daemon."));
  65         goto fail;
  66     }
  67
  68     if ((fd = pa_socket_cloexec(PF_UNIX, SOCK_STREAM, 0)) < 0) {
  69         pa_log(_("socket(PF_UNIX, SOCK_STREAM, 0): %s"), strerror(errno));
  70         goto fail;
  71     }
  72
  73     pa_zero(sa);
  74     sa.sun_family = AF_UNIX;
  75
  76     if (!(cli = pa_runtime_path("cli")))
  77         goto fail;
  78
  79     pa_strlcpy(sa.sun_path, cli, sizeof(sa.sun_path));
  80     pa_xfree(cli);
  81
  82     for (i = 0; i < 5; i++) {
  83         int r;
  84
  85         if ((r = connect(fd, (struct sockaddr*) &sa, sizeof(sa))) < 0 && (errno != ECONNREFUSED && errno != ENOENT)) {
  86             pa_log(_("connect(): %s"), strerror(errno));
  87             goto fail;
  88         }
  89
  90         if (r >= 0)
  91             break;
  92
  93         if (pa_pid_file_kill(SIGUSR2, NULL, "pulseaudio") < 0) {
  94             pa_log(_("Failed to kill PulseAudio daemon."));
  95             goto fail;
  96         }
  97
  98         pa_msleep(300);
  99     }
 100
 101     if (i >= 5) {
 102         pa_log(_("Daemon not responding."));
 103         goto fail;
 104     }
 105
 106     ibuf_index = ibuf_length = obuf_index = obuf_length = 0;
 107     ibuf_eof = obuf_eof = ibuf_closed = obuf_closed = FALSE;
 108
 109     if (argc > 1) {
 110         for (i = 1; i < argc; i++) {
 111             size_t k;
 112
 113             k = PA_MIN(sizeof(ibuf) - ibuf_length, strlen(argv[i]));
 114             memcpy(ibuf + ibuf_length, argv[i], k);
 115             ibuf_length += k;
 116
 117             if (ibuf_length < sizeof(ibuf)) {
 118                 ibuf[ibuf_length] = i < argc-1 ? ' ' : '\n';
 119                 ibuf_length++;
 120             }
 121         }
 122
 123         ibuf_eof = TRUE;
 124     }
 125
 126     for (;;) {
 127         struct pollfd *p;
 128
 129         if (ibuf_eof &&
 130             obuf_eof &&
 131             ibuf_length <= 0 &&
 132             obuf_length <= 0)
 133             break;
 134
 135         if (ibuf_length <= 0 && ibuf_eof && !ibuf_closed) {
 136             shutdown(fd, SHUT_WR);
 137             ibuf_closed = TRUE;
 138         }
 139
 140         if (obuf_length <= 0 && obuf_eof && !obuf_closed) {
 141             shutdown(fd, SHUT_RD);
 142             obuf_closed = TRUE;
 143         }
 144
 145         pa_zero(pollfd);
 146
 147         p = pollfd;
 148
 149         if (ibuf_length > 0 || (!obuf_eof && obuf_length <= 0)) {
 150             watch_socket = p++;
 151             watch_socket->fd = fd;
 152             watch_socket->events =
 153                 (ibuf_length > 0 ? POLLOUT : 0) |
 154                 (!obuf_eof && obuf_length <= 0 ? POLLIN : 0);
 155         } else
 156             watch_socket = NULL;
 157
 158         if (!ibuf_eof && ibuf_length <= 0) {
 159             watch_stdin = p++;
 160             watch_stdin->fd = STDIN_FILENO;
 161             watch_stdin->events = POLLIN;
 162         } else
 163             watch_stdin = NULL;
 164
 165         if (obuf_length > 0) {
 166             watch_stdout = p++;
 167             watch_stdout->fd = STDOUT_FILENO;
 168             watch_stdout->events = POLLOUT;
 169         } else
 170             watch_stdout = NULL;
 171
 172         if (pa_poll(pollfd, p-pollfd, -1) < 0) {
 173
 174             if (errno == EINTR)
 175                 continue;
 176
 177             pa_log(_("poll(): %s"), strerror(errno));
 178             goto fail;
 179         }
 180
 181         if (watch_stdin) {
 182             if (watch_stdin->revents & POLLIN) {
 183                 ssize_t r;
 184                 pa_assert(ibuf_length <= 0);
 185
 186                 if ((r = pa_read(STDIN_FILENO, ibuf, sizeof(ibuf), &stdin_type)) <= 0) {
 187                     if (r < 0) {
 188                         pa_log(_("read(): %s"), strerror(errno));
 189                         goto fail;
 190                     }
 191
 192                     ibuf_eof = TRUE;
 193                 } else {
 194                     ibuf_length = (size_t) r;
 195                     ibuf_index = 0;
 196                 }
 197             } else if (watch_stdin->revents & POLLHUP)
 198                 ibuf_eof = TRUE;
 199         }
 200
 201         if (watch_socket) {
 202             if (watch_socket->revents & POLLIN) {
 203                 ssize_t r;
 204                 pa_assert(obuf_length <= 0);
 205
 206                 if ((r = pa_read(fd, obuf, sizeof(obuf), &fd_type)) <= 0) {
 207                     if (r < 0) {
 208                         pa_log(_("read(): %s"), strerror(errno));
 209                         goto fail;
 210                     }
 211
 212                     obuf_eof = TRUE;
 213                 } else {
 214                     obuf_length = (size_t) r;
 215                     obuf_index = 0;
 216                 }
 217             } else if (watch_socket->revents & POLLHUP)
 218                 obuf_eof = TRUE;
 219         }
 220
 221         if (watch_stdout) {
 222             if (watch_stdout->revents & POLLHUP) {
 223                 obuf_eof = TRUE;
 224                 obuf_length = 0;
 225             } else if (watch_stdout->revents & POLLOUT) {
 226                 ssize_t r;
 227                 pa_assert(obuf_length > 0);
 228
 229                 if ((r = pa_write(STDOUT_FILENO, obuf + obuf_index, obuf_length, &stdout_type)) < 0) {
 230                     pa_log(_("write(): %s"), strerror(errno));
 231                     goto fail;
 232                 }
 233
 234                 obuf_length -= (size_t) r;
 235                 obuf_index += obuf_index;
 236             }
 237         }
 238
 239         if (watch_socket) {
 240             if (watch_socket->revents & POLLHUP) {
 241                 ibuf_eof = TRUE;
 242                 ibuf_length = 0;
 243             } if (watch_socket->revents & POLLOUT) {
 244                 ssize_t r;
 245                 pa_assert(ibuf_length > 0);
 246
 247                 if ((r = pa_write(fd, ibuf + ibuf_index, ibuf_length, &fd_type)) < 0) {
 248                     pa_log(_("write(): %s"), strerror(errno));
 249                     goto fail;
 250                 }
 251
 252                 ibuf_length -= (size_t) r;
 253                 ibuf_index += obuf_index;
 254             }
 255         }
 256     }
 257
 258     ret = 0;
 259
 260 fail:
 261     if (fd >= 0)
 262         pa_close(fd);
 263
 264     return ret;
 265 }