/* Copyright (C) 1993-2018 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 <errno.h>

#include <sys/types.h>

#include <grp.h>

#include <hurd.h>

#include <hurd/id.h>

/* Set the group set for the current user to GROUPS (N of them).  */

int

setgroups (size_t n, const gid_t *groups)

{

  error_t err;

  auth_t newauth;

  size_t i;

  gid_t new[n];

  /* Fault before taking locks.  */

  for (i = 0; i < n; ++i)

    new[i] = groups[i];

  HURD_CRITICAL_BEGIN;

  __mutex_lock (&_hurd_id.lock);

  err = _hurd_check_ids ();

  if (! err)

    {

      /* Get a new auth port using those IDs.  */

      err = __USEPORT (AUTH,

		       __auth_makeauth (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,

					_hurd_id.gen.uids, _hurd_id.gen.nuids,

					_hurd_id.aux.uids, _hurd_id.aux.nuids,

					new, n,

					_hurd_id.aux.gids, _hurd_id.aux.ngids,

					&newauth));

    }

  __mutex_unlock (&_hurd_id.lock);

  HURD_CRITICAL_END;

  if (err)

    return __hurd_fail (err);

  /* Install the new auth port and reauthenticate everything.  */

  err = __setauth (newauth);

  __mach_port_deallocate (__mach_task_self (), newauth);

  return err;

}

libc_hidden_def (setgroups)