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/* dirfd.c -- return the file descriptor associated with an open DIR*
Copyright (C) 2001, 2006, 2008-2024 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Jim Meyering. */
#include <config.h>
#include <dirent.h>
#include <errno.h>
#if GNULIB_defined_DIR
# include "dirent-private.h"
#endif
int
dirfd (DIR *dir_p)
{
#if GNULIB_defined_DIR
int fd = dir_p->fd_to_close;
if (fd == -1)
errno = EINVAL;
return fd;
#else
int fd = DIR_TO_FD (dir_p);
if (fd == -1)
errno = ENOTSUP;
return fd;
#endif
}
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