1/* File descriptor related functions.
2
3 Copyright (C) 2019-2024 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
36int
37is_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: fd, F_GETFD) >= 0;
44#else
45 return dup2 (fd, fd) < 0;
46#endif
47}
48

source code of libiberty/filedescriptor.c