1/* File descriptor related functions.
2
3   Copyright (C) 2019-2022 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, F_GETFD) >= 0;
44#else
45  return dup2 (fd, fd) < 0;
46#endif
47}
48