1/*
2 * Copyright (c) 2008 Apple Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23#define	_DARWIN_C_SOURCE
24
25#include <errno.h>
26#include <pwd.h>
27#include <stdint.h>
28#include <unistd.h>
29
30int32_t getgroupcount(const char *name, gid_t basegid);
31
32/*
33 * getgroups extension; not limited by NGROUPS_MAX
34 */
35int
36getgroups(int gidsetsize, gid_t grouplist[])
37{
38    struct passwd *pw;
39    int n;
40
41    if ((pw = getpwuid(getuid())) == NULL) {
42	errno = EINVAL;
43	return -1;
44    }
45    if (gidsetsize == 0) {
46	if ((n = getgroupcount(pw->pw_name, pw->pw_gid)) == 0) {
47	    errno = EINVAL;
48	    return -1;
49	}
50	return n;
51    }
52    n = gidsetsize;
53    if (getgrouplist(pw->pw_name, pw->pw_gid, (int *)grouplist, &n) < 0) {
54	errno = EINVAL;
55	return -1;
56    }
57    return n;
58}
59