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3bbceb12 | 1 | /* `group_member' -- test if process is in a given group. |
04277e02 | 2 | Copyright (C) 1995-2019 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 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
3bbceb12 RM |
18 | |
19 | #include <sys/types.h> | |
20 | #include <unistd.h> | |
21 | #include <stdlib.h> | |
22 | #include <limits.h> | |
23 | ||
24 | #ifndef NGROUPS_MAX | |
25 | #define NGROUPS_MAX 16 /* First guess. */ | |
26 | #endif | |
27 | ||
28 | int | |
9d46370c | 29 | __group_member (gid_t gid) |
3bbceb12 RM |
30 | { |
31 | int n, size; | |
32 | gid_t *groups; | |
33 | ||
34 | size = NGROUPS_MAX; | |
35 | do | |
36 | { | |
37 | groups = __alloca (size * sizeof *groups); | |
38 | n = __getgroups (size, groups); | |
39 | size *= 2; | |
ac2b484c UD |
40 | } |
41 | while (n == size / 2); | |
3bbceb12 | 42 | |
ac2b484c UD |
43 | while (n-- > 0) |
44 | if (groups[n] == gid) | |
3bbceb12 RM |
45 | return 1; |
46 | ||
47 | return 0; | |
48 | } | |
49 | weak_alias (__group_member, group_member) |