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/* `group_member' -- test if process is in a given group.
Copyright (C) 1995-2024 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
<https://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)
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