Absolute File Name: | /home/opencoverage/opencoverage/guest-scripts/coreutils/src/gnulib/lib/fd-safer-flag.c |
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1 | /* Adjust a file descriptor result so that it avoids clobbering | - | ||||||||||||
2 | STD{IN,OUT,ERR}_FILENO, with specific flags. | - | ||||||||||||
3 | - | |||||||||||||
4 | Copyright (C) 2005-2006, 2009-2018 Free Software Foundation, Inc. | - | ||||||||||||
5 | - | |||||||||||||
6 | This program is free software: you can redistribute it and/or modify | - | ||||||||||||
7 | it under the terms of the GNU General Public License as published by | - | ||||||||||||
8 | the Free Software Foundation; either version 3 of the License, or | - | ||||||||||||
9 | (at your option) any later version. | - | ||||||||||||
10 | - | |||||||||||||
11 | This program is distributed in the hope that it will be useful, | - | ||||||||||||
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | - | ||||||||||||
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | - | ||||||||||||
14 | GNU General Public License for more details. | - | ||||||||||||
15 | - | |||||||||||||
16 | You should have received a copy of the GNU General Public License | - | ||||||||||||
17 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ | - | ||||||||||||
18 | - | |||||||||||||
19 | /* Written by Paul Eggert and Eric Blake. */ | - | ||||||||||||
20 | - | |||||||||||||
21 | #include <config.h> | - | ||||||||||||
22 | - | |||||||||||||
23 | /* Specification. */ | - | ||||||||||||
24 | #include "unistd-safer.h" | - | ||||||||||||
25 | - | |||||||||||||
26 | #include <errno.h> | - | ||||||||||||
27 | #include <unistd.h> | - | ||||||||||||
28 | - | |||||||||||||
29 | /* Return FD, unless FD would be a copy of standard input, output, or | - | ||||||||||||
30 | error; in that case, return a duplicate of FD, closing FD. If FLAG | - | ||||||||||||
31 | contains O_CLOEXEC, the returned FD will have close-on-exec | - | ||||||||||||
32 | semantics. On failure to duplicate, close FD, set errno, and | - | ||||||||||||
33 | return -1. Preserve errno if FD is negative, so that the caller | - | ||||||||||||
34 | can always inspect errno when the returned value is negative. | - | ||||||||||||
35 | - | |||||||||||||
36 | This function is usefully wrapped around functions that return file | - | ||||||||||||
37 | descriptors, e.g., fd_safer_flag (open ("file", O_RDONLY | flag), flag). */ | - | ||||||||||||
38 | - | |||||||||||||
39 | int | - | ||||||||||||
40 | fd_safer_flag (int fd, int flag) | - | ||||||||||||
41 | { | - | ||||||||||||
42 | if (STDIN_FILENO <= fd && fd <= STDERR_FILENO)
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43 | { | - | ||||||||||||
44 | int f = dup_safer_flag (fd, flag); | - | ||||||||||||
45 | int e = errno; | - | ||||||||||||
46 | close (fd); | - | ||||||||||||
47 | errno = e; | - | ||||||||||||
48 | fd = f; | - | ||||||||||||
49 | } never executed: end of block | 0 | ||||||||||||
50 | - | |||||||||||||
51 | return fd; executed 2379 times by 1 test: return fd; Executed by:
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52 | } | - | ||||||||||||
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