1/* Invoke pipe2, but avoid some glitches.
2 Copyright (C) 2005-2006, 2009-2019 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 3 of the License, or
7 (at your option) 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, see <https://www.gnu.org/licenses/>. */
16
17/* Written by Eric Blake. */
18
19#include <config.h>
20
21/* Specification. */
22#include "unistd-safer.h"
23
24#include <unistd.h>
25#include <errno.h>
26
27/* Like pipe2, but ensure that neither of the file descriptors is
28 STDIN_FILENO, STDOUT_FILENO, or STDERR_FILENO. */
29
30int
31pipe2_safer (int fd[2], int flags)
32{
33 /* This is a generalization of the pipe_safer implementation. */
34 if (pipe2 (fd, flags) == 0)
35 {
36 int i;
37 for (i = 0; i < 2; i++)
38 {
39 fd[i] = fd_safer_flag (fd[i], flags);
40 if (fd[i] < 0)
41 {
42 int e = errno;
43 close (fd[1 - i]);
44 errno = e;
45 return -1;
46 }
47 }
48
49 return 0;
50 }
51 return -1;
52}
53