code.delx.au - pulseaudio/blob - src/pulsecore/pipe.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2006-2007 Pierre Ossman <ossman@cendio.se> for Cendio AB
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <errno.h>
  29 #include <unistd.h>
  30 #include <fcntl.h>
  31
  32 #include <sys/types.h>
  33
  34 #ifdef HAVE_SYS_SOCKET_H
  35 #include <sys/socket.h>
  36 #endif
  37
  38 #include "winsock.h"
  39
  40 #include "pipe.h"
  41
  42 #ifndef HAVE_PIPE
  43
  44 static int set_block(int fd, int blocking) {
  45 #ifdef O_NONBLOCK
  46
  47     int v;
  48
  49     assert(fd >= 0);
  50
  51     if ((v = fcntl(fd, F_GETFL)) < 0)
  52         return -1;
  53
  54     if (blocking)
  55         v &= ~O_NONBLOCK;
  56     else
  57         v |= O_NONBLOCK;
  58
  59     if (fcntl(fd, F_SETFL, v) < 0)
  60         return -1;
  61
  62     return 0;
  63
  64 #elif defined(OS_IS_WIN32)
  65
  66     u_long arg;
  67
  68     arg = !blocking;
  69
  70     if (ioctlsocket(fd, FIONBIO, &arg) < 0)
  71         return -1;
  72
  73     return 0;
  74
  75 #else
  76
  77     return -1;
  78
  79 #endif
  80 }
  81
  82 int pipe(int filedes[2]) {
  83     int listener;
  84     struct sockaddr_in addr, peer;
  85     socklen_t len;
  86
  87     listener = -1;
  88     filedes[0] = -1;
  89     filedes[1] = -1;
  90
  91     listener = socket(PF_INET, SOCK_STREAM, 0);
  92     if (listener < 0)
  93         goto error;
  94
  95     filedes[0] = socket(PF_INET, SOCK_STREAM, 0);
  96     if (filedes[0] < 0)
  97         goto error;
  98
  99     filedes[1] = socket(PF_INET, SOCK_STREAM, 0);
 100     if (filedes[1] < 0)
 101         goto error;
 102
 103     /* Make non-blocking so that connect() won't block */
 104     if (set_block(filedes[0], 0) < 0)
 105         goto error;
 106
 107     addr.sin_family = AF_INET;
 108     addr.sin_port = 0;
 109     addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 110
 111     if (bind(listener, (struct sockaddr*)&addr, sizeof(addr)) < 0)
 112         goto error;
 113
 114     if (listen(listener, 1) < 0)
 115         goto error;
 116
 117     len = sizeof(addr);
 118     if (getsockname(listener, (struct sockaddr*)&addr, &len) < 0)
 119         goto error;
 120
 121     if (connect(filedes[0], (struct sockaddr*)&addr, sizeof(addr)) < 0) {
 122 #ifdef OS_IS_WIN32
 123         if (WSAGetLastError() != EWOULDBLOCK)
 124 #else
 125         if (errno != EINPROGRESS)
 126 #endif
 127             goto error;
 128     }
 129
 130     len = sizeof(peer);
 131     filedes[1] = accept(listener, (struct sockaddr*)&peer, &len);
 132     if (filedes[1] < 0)
 133         goto error;
 134
 135     /* Restore blocking */
 136     if (set_block(filedes[0], 1) < 0)
 137         goto error;
 138
 139     len = sizeof(addr);
 140     if (getsockname(filedes[0], (struct sockaddr*)&addr, &len) < 0)
 141         goto error;
 142
 143     /* Check that someone else didn't steal the connection */
 144     if ((addr.sin_port != peer.sin_port) || (addr.sin_addr.s_addr != peer.sin_addr.s_addr))
 145         goto error;
 146
 147     pa_close(listener);
 148
 149     return 0;
 150
 151 error:
 152         if (listener >= 0)
 153                 pa_close(listener);
 154         if (filedes[0] >= 0)
 155                 pa_close(filedes[0]);
 156         if (filedes[1] >= 0)
 157                 pa_close(filedes[0]);
 158
 159         return -1;
 160 }
 161
 162 #endif /* HAVE_PIPE */