| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* `group_member' -- test if process is in a given group. |
| 2 | Copyright (C) 1995-2015 Free Software Foundation, Inc. |
| 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 |
| 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. |
| 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 |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 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 |
| 29 | __group_member (gid) |
| 30 | gid_t gid; |
| 31 | { |
| 32 | int n, size; |
| 33 | gid_t *groups; |
| 34 | |
| 35 | size = NGROUPS_MAX; |
| 36 | do |
| 37 | { |
| 38 | groups = __alloca (size * sizeof *groups); |
| 39 | n = __getgroups (size, groups); |
| 40 | size *= 2; |
| 41 | } |
| 42 | while (n == size / 2); |
| 43 | |
| 44 | while (n-- > 0) |
| 45 | if (groups[n] == gid) |
| 46 | return 1; |
| 47 | |
| 48 | return 0; |
| 49 | } |
| 50 | weak_alias (__group_member, group_member) |