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("$FreeBSD$");
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
51 CTASSERT(1 << _ACL_T_ALIGNMENT_BITS > sizeof(struct acl_t_struct));
52
53 acl_t
acl_init(int count)54 acl_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 acl->ats_acl.acl_cnt = count;
79
80 return (acl);
81 }
82
83 acl_t
acl_dup(acl_t acl)84 acl_dup(acl_t acl)
85 {
86 acl_t acl_new;
87
88 acl_new = acl_init(ACL_MAX_ENTRIES);
89 if (acl_new != NULL) {
90 *acl_new = *acl;
91 acl->ats_cur_entry = 0;
92 acl_new->ats_cur_entry = 0;
93 }
94
95 return (acl_new);
96 }
97