50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/* `group_member' -- test if process is in a given group.
|
|
Copyright (C) 1995-2019 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)
|