/*

  File: acl_get_fd.c

  Copyright (C) 1999, 2000

  Andreas Gruenbacher, <a.gruenbacher@bestbits.at>

  This program 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 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

  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public

  License along with this library; if not, write to the Free Software

  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

*/

#include "config.h"

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

#include <stdio.h>

#include <sys/xattr.h>

#include "libacl.h"

#include "__acl_from_xattr.h"

#include "byteorder.h"

#include "acl_ea.h"

/* 23.4.15 */

acl_t

acl_get_fd(int fd)

{

	const size_t size_guess = acl_ea_size(16);

	char *ext_acl_p = alloca(size_guess);

	int retval;

	if (!ext_acl_p)

		return NULL;

	retval = fgetxattr(fd, ACL_EA_ACCESS, ext_acl_p, size_guess);

	if (retval == -1 && errno == ERANGE) {

		retval = fgetxattr(fd, ACL_EA_ACCESS, NULL, 0);

		if (retval > 0) {

			ext_acl_p = alloca(retval);

			if (!ext_acl_p)

				return NULL;

			retval = fgetxattr(fd, ACL_EA_ACCESS, ext_acl_p,retval);

		}

	}

	if (retval > 0) {

		acl_t acl = __acl_from_xattr(ext_acl_p, retval);

		return acl;

	} else if (retval == 0 || errno == ENOATTR || errno == ENODATA) {

		struct stat st;

		if (fstat(fd, &st) == 0)

			return acl_from_mode(st.st_mode);

		else

			return NULL;

	} else

		return NULL;

}