mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
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157 lines
3.4 KiB
C
157 lines
3.4 KiB
C
/***
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This file is part of PulseAudio.
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Copyright 2006-2007 Pierre Ossman <ossman@cendio.se> for Cendio AB
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License,
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or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PulseAudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <pulsecore/socket.h>
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#include <pulsecore/core-util.h>
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#include "pipe.h"
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#ifndef HAVE_PIPE
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static int set_block(int fd, int blocking) {
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#ifdef O_NONBLOCK
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int v;
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assert(fd >= 0);
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if ((v = fcntl(fd, F_GETFL)) < 0)
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return -1;
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if (blocking)
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v &= ~O_NONBLOCK;
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else
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v |= O_NONBLOCK;
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if (fcntl(fd, F_SETFL, v) < 0)
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return -1;
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return 0;
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#elif defined(OS_IS_WIN32)
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u_long arg;
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arg = !blocking;
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if (ioctlsocket(fd, FIONBIO, &arg) < 0)
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return -1;
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return 0;
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#else
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return -1;
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#endif
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}
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int pipe(int filedes[2]) {
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int listener;
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struct sockaddr_in addr, peer;
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socklen_t len;
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listener = -1;
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filedes[0] = -1;
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filedes[1] = -1;
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listener = socket(PF_INET, SOCK_STREAM, 0);
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if (listener < 0)
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goto error;
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filedes[0] = socket(PF_INET, SOCK_STREAM, 0);
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if (filedes[0] < 0)
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goto error;
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filedes[1] = socket(PF_INET, SOCK_STREAM, 0);
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if (filedes[1] < 0)
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goto error;
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/* Make non-blocking so that connect() won't block */
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if (set_block(filedes[0], 0) < 0)
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goto error;
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addr.sin_family = AF_INET;
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addr.sin_port = 0;
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addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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if (bind(listener, (struct sockaddr*)&addr, sizeof(addr)) < 0)
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goto error;
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if (listen(listener, 1) < 0)
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goto error;
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len = sizeof(addr);
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if (getsockname(listener, (struct sockaddr*)&addr, &len) < 0)
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goto error;
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if (connect(filedes[0], (struct sockaddr*)&addr, sizeof(addr)) < 0) {
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#ifdef OS_IS_WIN32
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if (WSAGetLastError() != EWOULDBLOCK)
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#else
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if (errno != EINPROGRESS)
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#endif
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goto error;
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}
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len = sizeof(peer);
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filedes[1] = accept(listener, (struct sockaddr*)&peer, &len);
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if (filedes[1] < 0)
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goto error;
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/* Restore blocking */
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if (set_block(filedes[0], 1) < 0)
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goto error;
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len = sizeof(addr);
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if (getsockname(filedes[0], (struct sockaddr*)&addr, &len) < 0)
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goto error;
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/* Check that someone else didn't steal the connection */
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if ((addr.sin_port != peer.sin_port) || (addr.sin_addr.s_addr != peer.sin_addr.s_addr))
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goto error;
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pa_close(listener);
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return 0;
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error:
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if (listener >= 0)
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pa_close(listener);
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if (filedes[0] >= 0)
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pa_close(filedes[0]);
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if (filedes[1] >= 0)
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pa_close(filedes[1]);
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return -1;
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}
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#endif /* HAVE_PIPE */
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