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533da483 NC |
1 | /* File descriptor related functions. |
2 | ||
3 | Copyright (C) 2019-2020 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of the libiberty library. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, | |
20 | Boston, MA 02110-1301, USA. */ | |
21 | ||
22 | #include "config.h" | |
23 | #include "ansidecl.h" | |
24 | #include "libiberty.h" | |
25 | ||
26 | #ifdef HAVE_FCNTL_H | |
27 | #include <fcntl.h> | |
28 | #endif | |
29 | ||
30 | #if defined (_WIN32) | |
31 | #define WIN32_LEAN_AND_MEAN | |
32 | #include <windows.h> /* for GetFullPathName */ | |
33 | #endif | |
34 | /* Return true when FD file descriptor exists. */ | |
35 | ||
36 | int | |
37 | is_valid_fd (int fd) | |
38 | { | |
39 | #if defined(_WIN32) | |
40 | HANDLE h = (HANDLE) _get_osfhandle (fd); | |
41 | return h != (HANDLE) -1; | |
42 | #elif defined(F_GETFD) | |
43 | return fcntl (fd, F_GETFD) >= 0; | |
44 | #else | |
45 | return dup2 (fd, fd) < 0; | |
46 | #endif | |
47 | } |