/* 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 <hurd.h>

#include <hurd/id.h>

#include <string.h>

int

geteuids (int n, uid_t *uidset)

{

  error_t err;

  int nuids;

  void *crit;

  crit = _hurd_critical_section_lock ();

  __mutex_lock (&_hurd_id.lock);

  if (err = _hurd_check_ids ())

    {

      __mutex_unlock (&_hurd_id.lock);

      _hurd_critical_section_unlock (crit);

      return __hurd_fail (err);

    }

  nuids = _hurd_id.gen.nuids;

  if (n != 0)

    {

      /* Copy the uids onto stack storage and then release the idlock.  */

      uid_t uids[nuids];

      memcpy (uids, _hurd_id.gen.uids, sizeof (uids));

      __mutex_unlock (&_hurd_id.lock);

      _hurd_critical_section_unlock (crit);

      /* Now that the lock is released, we can safely copy the

	 uid set into the user's array, which might fault.  */

      if (nuids > n)

	nuids = n;

      memcpy (uidset, uids, nuids * sizeof (uid_t));

    }

  else

    {

      __mutex_unlock (&_hurd_id.lock);

      _hurd_critical_section_unlock (crit);

    }

  return nuids;

}

/* XXX Remove this alias when we bump the libc soname.  */

#ifdef SHARED

weak_alias (geteuids, __getuids)

#endif