sysdeps/mach/hurd/setgroups.c

   1 /* Copyright (C) 1993,94,97,2002 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 <errno.h>
  20 #include <sys/types.h>
  21 #include <grp.h>
  22 #include <hurd.h>
  23 #include <hurd/id.h>
  24
  25 /* Set the group set for the current user to GROUPS (N of them).  */
  26 int
  27 setgroups (n, groups)
  28      size_t n;
  29      const gid_t *groups;
  30 {
  31   error_t err;
  32   auth_t newauth;
  33   size_t i;
  34   gid_t new[n];
  35
  36   /* Fault before taking locks.  */
  37   for (i = 0; i < n; ++i)
  38     new[i] = groups[i];
  39
  40   HURD_CRITICAL_BEGIN;
  41   __mutex_lock (&_hurd_id.lock);
  42   err = _hurd_check_ids ();
  43   if (! err)
  44     {
  45       /* Get a new auth port using those IDs.  */
  46       err = __USEPORT (AUTH,
  47                        __auth_makeauth (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
  48                                         _hurd_id.gen.uids, _hurd_id.gen.nuids,
  49                                         _hurd_id.aux.uids, _hurd_id.aux.nuids,
  50                                         new, n,
  51                                         _hurd_id.aux.gids, _hurd_id.aux.ngids,
  52                                         &newauth));
  53     }
  54   __mutex_unlock (&_hurd_id.lock);
  55   HURD_CRITICAL_END;
  56
  57   if (err)
  58     return __hurd_fail (err);
  59
  60   /* Install the new auth port and reauthenticate everything.  */
  61   err = __setauth (newauth);
  62   __mach_port_deallocate (__mach_task_self (), newauth);
  63   return err;
  64 }
  65 libc_hidden_def (setgroups)