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author | Ton Voon <tonvoon@users.sourceforge.net> | 2007-01-24 22:47:25 +0000 |
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committer | Ton Voon <tonvoon@users.sourceforge.net> | 2007-01-24 22:47:25 +0000 |
commit | fe856aa957978504137c1d425815d4ed8a22be40 (patch) | |
tree | a5bb46ce0e64b2056f75700eadbf27aba7c39418 /gl/fd-safer.c | |
parent | 210f39bc84cfbb21cd72dc054e43f13815ee0616 (diff) | |
download | monitoring-plugins-fe856aa957978504137c1d425815d4ed8a22be40.tar.gz |
Sync with gnulib - lots of extraneous code removed in preference to GNU code
git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1580 f882894a-f735-0410-b71e-b25c423dba1c
Diffstat (limited to 'gl/fd-safer.c')
-rw-r--r-- | gl/fd-safer.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/gl/fd-safer.c b/gl/fd-safer.c new file mode 100644 index 00000000..256bfa4a --- /dev/null +++ b/gl/fd-safer.c | |||
@@ -0,0 +1,57 @@ | |||
1 | /* Return a safer copy of a file descriptor. | ||
2 | |||
3 | Copyright (C) 2005, 2006 Free Software Foundation, Inc. | ||
4 | |||
5 | This program is free software; you can redistribute it and/or modify | ||
6 | it under the terms of the GNU General Public License as published by | ||
7 | the Free Software Foundation; either version 2, or (at your option) | ||
8 | any later version. | ||
9 | |||
10 | This program is distributed in the hope that it will be useful, | ||
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
13 | GNU General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU General Public License | ||
16 | along with this program; if not, write to the Free Software Foundation, | ||
17 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | ||
18 | |||
19 | /* Written by Paul Eggert. */ | ||
20 | |||
21 | #include <config.h> | ||
22 | |||
23 | #include "unistd-safer.h" | ||
24 | |||
25 | #include <errno.h> | ||
26 | |||
27 | #include <unistd.h> | ||
28 | #ifndef STDIN_FILENO | ||
29 | # define STDIN_FILENO 0 | ||
30 | #endif | ||
31 | #ifndef STDERR_FILENO | ||
32 | # define STDERR_FILENO 2 | ||
33 | #endif | ||
34 | |||
35 | /* Return FD, unless FD would be a copy of standard input, output, or | ||
36 | error; in that case, return a duplicate of FD, closing FD. On | ||
37 | failure to duplicate, close FD, set errno, and return -1. Preserve | ||
38 | errno if FD is negative, so that the caller can always inspect | ||
39 | errno when the returned value is negative. | ||
40 | |||
41 | This function is usefully wrapped around functions that return file | ||
42 | descriptors, e.g., fd_safer (open ("file", O_RDONLY)). */ | ||
43 | |||
44 | int | ||
45 | fd_safer (int fd) | ||
46 | { | ||
47 | if (STDIN_FILENO <= fd && fd <= STDERR_FILENO) | ||
48 | { | ||
49 | int f = dup_safer (fd); | ||
50 | int e = errno; | ||
51 | close (fd); | ||
52 | errno = e; | ||
53 | fd = f; | ||
54 | } | ||
55 | |||
56 | return fd; | ||
57 | } | ||