1: /* Copyright (C) 1993, 94, 96, 97, 98, 2000 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3: 
    4:    The GNU C Library is free software; you can redistribute it and/or
    5:    modify it under the terms of the GNU Lesser General Public
    6:    License as published by the Free Software Foundation; either
    7:    version 2.1 of the License, or (at your option) any later version.
    8: 
    9:    The GNU C Library is distributed in the hope that it will be useful,
   10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   12:    Lesser General Public License for more details.
   13: 
   14:    You should have received a copy of the GNU Lesser General Public
   15:    License along with the GNU C Library; if not, write to the Free
   16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   17:    02111-1307 USA.  */
   18: 
   19: #include <hurd.h>
   20: #include <hurd/id.h>
   21: #include <string.h>
   22: 
   23: int
   24: geteuids (int n, uid_t *uidset)
   25: {
   26:   error_t err;
   27:   int nuids;
   28:   void *crit;
   29: 
   30:   crit = _hurd_critical_section_lock ();
   31:   __mutex_lock (&_hurd_id.lock);
   32: 
   33:   if (err = _hurd_check_ids ())
   34:     {
   35:       __mutex_unlock (&_hurd_id.lock);
   36:       _hurd_critical_section_unlock (crit);
   37:       return __hurd_fail (err);
   38:     }
   39: 
   40:   nuids = _hurd_id.gen.nuids;
   41: 
   42:   if (n != 0)
   43:     {
   44:       /* Copy the uids onto stack storage and then release the idlock.  */
   45:       uid_t uids[nuids];
   46:       memcpy (uids, _hurd_id.gen.uids, sizeof (uids));
   47:       __mutex_unlock (&_hurd_id.lock);
   48:       _hurd_critical_section_unlock (crit);
   49: 
   50:       /* Now that the lock is released, we can safely copy the
   51:          uid set into the user's array, which might fault.  */
   52:       if (nuids > n)
   53:         nuids = n;
   54:       memcpy (uidset, uids, nuids * sizeof (uid_t));
   55:     }
   56:   else
   57:     {
   58:       __mutex_unlock (&_hurd_id.lock);
   59:       _hurd_critical_section_unlock (crit);
   60:     }
   61: 
   62:   return nuids;
   63: }
   64: 
   65: /* XXX Remove this alias when we bump the libc soname.  */
   66: 
   67: #if defined SHARED && DO_VERSIONING
   68: weak_alias (geteuids, __getuids)
   69: #endif