glibc/sysdeps/mach/hurd/group_member.c

/* `group_member' -- test if process is in a given group.  Hurd version.
Copyright (C) 1993, 1994, 1995 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <errno.h>
#include <unistd.h>
#include <hurd.h>
#include <hurd/id.h>

int
__group_member (gid)
     gid_t gid;
{
  int member = 0;
  error_t err;
  void *crit;

  crit = _hurd_critical_section_lock ();
  __mutex_lock (&_hurd_id.lock);

  err = _hurd_check_ids ();
  if (! err)
    {
      size_t i;
      for (i = 0; i < _hurd_id.gen.ngids; ++i)
	if (_hurd_id.gen.gids[i] == gid)
	  {
	    member = 1;
	    break;
	  }
    }

  __mutex_unlock (&_hurd_id.lock);
  _hurd_critical_section_unlock (crit);

  if (err)
    __hurd_fail (err);
  return member;
}

weak_alias (__group_member, group_member)