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/* Copyright (C) 1992-2017 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, see
<http://www.gnu.org/licenses/>. */
#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)
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