acl_init.c revision 331722 
1/*-
2 * Copyright (c) 1999, 2000, 2001 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26/*
27 * acl_init -- return a fresh acl structure
28 * acl_dup -- duplicate an acl and return the new copy
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: stable/11/lib/libc/posix1e/acl_init.c 331722 2018-03-29 02:50:57Z eadler $");
33
34#include <sys/types.h>
35#include "namespace.h"
36#include <sys/acl.h>
37#include "un-namespace.h"
38#include <errno.h>
39#include <stdlib.h>
40#include <string.h>
41#include <assert.h>
42
43#include "acl_support.h"
44
45#ifndef CTASSERT
46#define CTASSERT(x)		_CTASSERT(x, __LINE__)
47#define _CTASSERT(x, y)		__CTASSERT(x, y)
48#define __CTASSERT(x, y)	typedef char __assert_ ## y [(x) ? 1 : -1]
49#endif
50
51CTASSERT(1 << _ACL_T_ALIGNMENT_BITS > sizeof(struct acl_t_struct));
52
53acl_t
54acl_init(int count)
55{
56	int error;
57	acl_t acl;
58
59	if (count > ACL_MAX_ENTRIES) {
60		errno = ENOMEM;
61		return (NULL);
62	}
63	if (count < 0) {
64		errno = EINVAL;
65		return (NULL);
66	}
67
68	error = posix_memalign((void *)&acl, 1 << _ACL_T_ALIGNMENT_BITS,
69	    sizeof(struct acl_t_struct));
70	if (error) {
71		errno = error;
72		return (NULL);
73	}
74
75	bzero(acl, sizeof(struct acl_t_struct));
76	acl->ats_brand = ACL_BRAND_UNKNOWN;
77	acl->ats_acl.acl_maxcnt = ACL_MAX_ENTRIES;
78
79	return (acl);
80}
81
82acl_t
83acl_dup(acl_t acl)
84{
85	acl_t	acl_new;
86
87	acl_new = acl_init(ACL_MAX_ENTRIES);
88	if (acl_new != NULL) {
89		*acl_new = *acl;
90		acl->ats_cur_entry = 0;
91		acl_new->ats_cur_entry = 0;
92	}
93
94	return (acl_new);
95}
96