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glibc  2.9
setgroups.c
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00001 /* Copyright (C) 1993,94,97,2002 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <sys/types.h>
00021 #include <grp.h>
00022 #include <hurd.h>
00023 #include <hurd/id.h>
00024 
00025 /* Set the group set for the current user to GROUPS (N of them).  */
00026 int
00027 setgroups (n, groups)
00028      size_t n;
00029      const gid_t *groups;
00030 {
00031   error_t err;
00032   auth_t newauth;
00033   size_t i;
00034   gid_t new[n];
00035 
00036   /* Fault before taking locks.  */
00037   for (i = 0; i < n; ++i)
00038     new[i] = groups[i];
00039 
00040   HURD_CRITICAL_BEGIN;
00041   __mutex_lock (&_hurd_id.lock);
00042   err = _hurd_check_ids ();
00043   if (! err)
00044     {
00045       /* Get a new auth port using those IDs.  */
00046       err = __USEPORT (AUTH,
00047                      __auth_makeauth (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
00048                                    _hurd_id.gen.uids, _hurd_id.gen.nuids,
00049                                    _hurd_id.aux.uids, _hurd_id.aux.nuids,
00050                                    new, n,
00051                                    _hurd_id.aux.gids, _hurd_id.aux.ngids,
00052                                    &newauth));
00053     }
00054   __mutex_unlock (&_hurd_id.lock);
00055   HURD_CRITICAL_END;
00056 
00057   if (err)
00058     return __hurd_fail (err);
00059 
00060   /* Install the new auth port and reauthenticate everything.  */
00061   err = __setauth (newauth);
00062   __mach_port_deallocate (__mach_task_self (), newauth);
00063   return err;
00064 }
00065 libc_hidden_def (setgroups)