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/* Invoke pipe, but avoid some glitches.
Copyright (C) 2005, 2006 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* Written by Jim Meyering. */
#include <config.h>
#include "unistd-safer.h"
#include <unistd.h>
#include <errno.h>
/* Like pipe, but ensure that neither of the file descriptors is
STDIN_FILENO, STDOUT_FILENO, or STDERR_FILENO. Fail with ENOSYS on
platforms that lack pipe. */
int
pipe_safer (int fd[2])
{
#if HAVE_PIPE
if (pipe (fd) == 0)
{
int i;
for (i = 0; i < 2; i++)
{
fd[i] = fd_safer (fd[i]);
if (fd[i] < 0)
{
int e = errno;
close (fd[1 - i]);
errno = e;
return -1;
}
}
return 0;
}
#else
errno = ENOSYS;
#endif
return -1;
}
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