Commit | Line | Data |
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6ec2e0f5 | 1 | /* Invoke pipe, but avoid some glitches. |
5e8754f9 | 2 | Copyright (C) 2005-2006, 2009-2016 Free Software Foundation, Inc. |
6ec2e0f5 SDJ |
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 | |
5e8754f9 | 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
6ec2e0f5 SDJ |
16 | |
17 | /* Written by Jim Meyering. */ | |
18 | ||
19 | #include <config.h> | |
20 | ||
21 | #include "unistd-safer.h" | |
22 | ||
23 | #include <unistd.h> | |
24 | #include <errno.h> | |
25 | ||
26 | /* Like pipe, but ensure that neither of the file descriptors is | |
27 | STDIN_FILENO, STDOUT_FILENO, or STDERR_FILENO. Fail with ENOSYS on | |
28 | platforms that lack pipe. */ | |
29 | ||
30 | int | |
31 | pipe_safer (int fd[2]) | |
32 | { | |
33 | #if HAVE_PIPE | |
34 | if (pipe (fd) == 0) | |
35 | { | |
36 | int i; | |
37 | for (i = 0; i < 2; i++) | |
38 | { | |
39 | fd[i] = fd_safer (fd[i]); | |
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 | #else | |
52 | errno = ENOSYS; | |
53 | #endif | |
54 | ||
55 | return -1; | |
56 | } |