1 /*
2 * Copyright (C) 2008 The Android Open Source Project
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 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28 #include <grp.h>
29 #include <unistd.h>
30 #include <stdlib.h>
31
32 #define INIT_GROUPS 2
33
34 int
initgroups(const char * user,gid_t group)35 initgroups (const char *user, gid_t group)
36 {
37 gid_t groups0[ INIT_GROUPS ];
38 gid_t* groups = groups0;
39 int ret = -1;
40 int numgroups = INIT_GROUPS;
41
42 if (getgrouplist(user, group, groups, &numgroups) < 0) {
43 groups = malloc(numgroups*sizeof(groups[0]));
44 if (groups == NULL)
45 return -1;
46 if (getgrouplist(user,group,groups,&numgroups) < 0) {
47 goto EXIT;
48 }
49 }
50
51 ret = setgroups(numgroups, groups);
52
53 EXIT:
54 if (groups != groups0)
55 free(groups);
56
57 return ret;
58 }
59