1/* Invoke pipe, but avoid some glitches.
2   Copyright (C) 2005 Free Software Foundation, Inc.
3
4   This program is free software; you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 2, or (at your option)
7   any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program; if not, write to the Free Software Foundation,
16   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
17
18/* Written by Jim Meyering.  */
19
20#ifdef HAVE_CONFIG_H
21# include <config.h>
22#endif
23
24#include "unistd-safer.h"
25
26#include <unistd.h>
27
28/* Like pipe, but ensure that neither of the file descriptors is
29   STDIN_FILENO, STDOUT_FILENO, or STDERR_FILENO.  */
30
31int
32pipe_safer (int fd[2])
33{
34  int fail = pipe (fd);
35  if (fail)
36    return fail;
37
38  {
39    int i;
40    for (i = 0; i < 2; i++)
41      {
42	int f = fd_safer (fd[i]);
43	if (f < 0)
44	  return -1;
45	fd[i] = f;
46      }
47  }
48
49  return 0;
50}
51