1/*
2  File: acl_get_fd.c
3
4  Copyright (C) 1999, 2000
5  Andreas Gruenbacher, <a.gruenbacher@computer.org>
6
7  This program is free software; you can redistribute it and/or
8  modify it under the terms of the GNU Library General Public
9  License as published by the Free Software Foundation; either
10  version 2 of the License, or (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 GNU
15  Library General Public License for more details.
16
17  You should have received a copy of the GNU Library General Public
18  License along with this library; if not, write to the Free Software
19  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20*/
21
22#include <sys/types.h>
23#include <sys/stat.h>
24#include <unistd.h>
25#include <stdio.h>
26#include "../../attr/include/xattr.h"
27#include <acl/libacl.h>
28#include "libacl.h"
29#include "__acl_from_xattr.h"
30
31#include "byteorder.h"
32#include "acl_ea.h"
33
34
35/* 23.4.15 */
36acl_t
37acl_get_fd(int fd)
38{
39	const size_t size_guess = acl_ea_size(16);
40	char *ext_acl_p = alloca(size_guess);
41	int retval;
42
43	if (!ext_acl_p)
44		return NULL;
45	retval = fgetxattr(fd, ACL_EA_ACCESS, ext_acl_p, size_guess);
46	if (retval == -1 && errno == ERANGE) {
47		retval = fgetxattr(fd, ACL_EA_ACCESS, NULL, 0);
48		if (retval > 0) {
49			ext_acl_p = alloca(retval);
50			if (!ext_acl_p)
51				return NULL;
52			retval = fgetxattr(fd, ACL_EA_ACCESS, ext_acl_p,retval);
53		}
54	}
55	if (retval > 0) {
56		acl_t acl = __acl_from_xattr(ext_acl_p, retval);
57		return acl;
58	} else if (retval == 0 || errno == ENOATTR || errno == ENODATA) {
59		struct stat st;
60
61		if (fstat(fd, &st) == 0)
62			return acl_from_mode(st.st_mode);
63		else
64			return NULL;
65	} else
66		return NULL;
67}
68
69