| /* `group_member' -- test if process is in a given group. |
| Copyright (C) 1995-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sys/types.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <limits.h> |
| |
| #ifndef NGROUPS_MAX |
| #define NGROUPS_MAX 16 /* First guess. */ |
| #endif |
| |
| int |
| __group_member (gid_t gid) |
| { |
| int n, size; |
| gid_t *groups; |
| |
| size = NGROUPS_MAX; |
| do |
| { |
| groups = __alloca (size * sizeof *groups); |
| n = __getgroups (size, groups); |
| size *= 2; |
| } |
| while (n == size / 2); |
| |
| while (n-- > 0) |
| if (groups[n] == gid) |
| return 1; |
| |
| return 0; |
| } |
| weak_alias (__group_member, group_member) |