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/* File descriptor related functions.
Copyright (C) 2019-2025 Free Software Foundation, Inc.
This file is part of the libiberty library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "config.h"
#include "ansidecl.h"
#include "libiberty.h"
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#if defined (_WIN32)
#define WIN32_LEAN_AND_MEAN
#include <windows.h> /* for GetFullPathName */
#endif
/* Return true when FD file descriptor exists. */
int
is_valid_fd (int fd)
{
#if defined(_WIN32)
HANDLE h = (HANDLE) _get_osfhandle (fd);
return h != (HANDLE) -1;
#elif defined(F_GETFD)
return fcntl (fd, F_GETFD) >= 0;
#else
return dup2 (fd, fd) < 0;
#endif
}
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