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
31 int
pipe_safer(int fd[2])32 pipe_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