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3bbceb12 | 1 | /* `group_member' -- test if process is in a given group. |
d77a71c5 | 2 | Copyright (C) 1995, 1997, 2002 Free Software Foundation, Inc. |
478b92f0 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
478b92f0 UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
478b92f0 | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
3bbceb12 RM |
19 | |
20 | #include <sys/types.h> | |
21 | #include <unistd.h> | |
22 | #include <stdlib.h> | |
23 | #include <limits.h> | |
24 | ||
25 | #ifndef NGROUPS_MAX | |
26 | #define NGROUPS_MAX 16 /* First guess. */ | |
27 | #endif | |
28 | ||
29 | int | |
30 | __group_member (gid) | |
31 | gid_t gid; | |
32 | { | |
33 | int n, size; | |
34 | gid_t *groups; | |
35 | ||
36 | size = NGROUPS_MAX; | |
37 | do | |
38 | { | |
39 | groups = __alloca (size * sizeof *groups); | |
40 | n = __getgroups (size, groups); | |
41 | size *= 2; | |
42 | } while (n == size / 2); | |
43 | ||
d77a71c5 | 44 | while (n >= 0) |
3bbceb12 RM |
45 | if (groups[n--] == gid) |
46 | return 1; | |
47 | ||
48 | return 0; | |
49 | } | |
50 | weak_alias (__group_member, group_member) |