Absolute File Name: | /home/opencoverage/opencoverage/guest-scripts/coreutils/src/gnulib/lib/fd-safer.c |
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1 | /* Return a safer copy of a file descriptor. | - | ||||||||||||
2 | - | |||||||||||||
3 | Copyright (C) 2005-2006, 2009-2018 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 3 of the License, or | - | ||||||||||||
8 | (at your option) 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, see <https://www.gnu.org/licenses/>. */ | - | ||||||||||||
17 | - | |||||||||||||
18 | /* Written by Paul Eggert. */ | - | ||||||||||||
19 | - | |||||||||||||
20 | #include <config.h> | - | ||||||||||||
21 | - | |||||||||||||
22 | #include "unistd-safer.h" | - | ||||||||||||
23 | - | |||||||||||||
24 | #include <errno.h> | - | ||||||||||||
25 | #include <unistd.h> | - | ||||||||||||
26 | - | |||||||||||||
27 | /* Return FD, unless FD would be a copy of standard input, output, or | - | ||||||||||||
28 | error; in that case, return a duplicate of FD, closing FD. On | - | ||||||||||||
29 | failure to duplicate, close FD, set errno, and return -1. Preserve | - | ||||||||||||
30 | errno if FD is negative, so that the caller can always inspect | - | ||||||||||||
31 | errno when the returned value is negative. | - | ||||||||||||
32 | - | |||||||||||||
33 | This function is usefully wrapped around functions that return file | - | ||||||||||||
34 | descriptors, e.g., fd_safer (open ("file", O_RDONLY)). */ | - | ||||||||||||
35 | - | |||||||||||||
36 | int | - | ||||||||||||
37 | fd_safer (int fd) | - | ||||||||||||
38 | { | - | ||||||||||||
39 | if (STDIN_FILENO <= fd && fd <= STDERR_FILENO)
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40 | { | - | ||||||||||||
41 | int f = dup_safer (fd); | - | ||||||||||||
42 | int e = errno; | - | ||||||||||||
43 | close (fd); | - | ||||||||||||
44 | errno = e; | - | ||||||||||||
45 | fd = f; | - | ||||||||||||
46 | } executed 5 times by 3 tests: end of block Executed by:
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47 | - | |||||||||||||
48 | return fd; executed 88049 times by 15 tests: return fd; Executed by:
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49 | } | - | ||||||||||||
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