/* Copyright (C) 1992,93,94,95,96,99,2000,2002 Free Software Foundation, Inc.   This file is part of the GNU C Library.   The GNU C Library is free software; you can redistribute it and/or   modify it under the terms of the GNU Lesser General Public   License as published by the Free Software Foundation; either   version 2.1 of the License, or (at your option) any later version.   The GNU C Library is distributed in the hope that it will be useful,   but WITHOUT ANY WARRANTY; without even the implied warranty of   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU   Lesser General Public License for more details.   You should have received a copy of the GNU Lesser General Public   License along with the GNU C Library; if not, write to the Free   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA.  */#include <errno.h>#include <sys/socket.h>#include <sys/stat.h>#include <unistd.h>/* Create a one-way communication channel (pipe).   Actually the channel is two-way on the Hurd.   If successful, two file descriptors are stored in FDS;   bytes written on FDS[1] can be read from FDS[0].   Returns 0 if successful, -1 if not.  */int__pipe (int fds[2]){  int save_errno = errno;  int result;  /* The magic S_IFIFO protocol tells the pflocal server to create     sockets which report themselves as FIFOs, as POSIX requires for     pipes.  */  result = __socketpair (PF_LOCAL, SOCK_STREAM, S_IFIFO, fds);  if (result == -1 && errno == EPROTONOSUPPORT)    {      /* We contacted an "old" pflocal server that doesn't support the         magic S_IFIFO protocol.	 FIXME: Remove this junk somewhere in the future.  */      __set_errno (save_errno);      return __socketpair (PF_LOCAL, SOCK_STREAM, 0, fds);    }  return result;}libc_hidden_def (__pipe)weak_alias (__pipe, pipe)