1: /* Copyright (C) 1999, 2001 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 <unistd.h>
   20: 
   21: #include <hurd.h>
   22: #include <hurd/fd.h>
   23: #include <hurd/port.h>
   24: 
   25: /* Change the current root directory to FD.  */
   26: int
   27: fchroot (int fd)
   28: {
   29:   error_t err;
   30:   file_t dir;
   31: 
   32:   err = HURD_DPORT_USE (fd,
   33:                         ({
   34:                           dir = __file_name_lookup_under (port, ".", 0, 0);
   35:                           dir == MACH_PORT_NULL ? errno : 0;
   36:                         }));
   37: 
   38:   if (! err)
   39:     {
   40:       file_t root;
   41: 
   42:       /* Prevent going through DIR's ..  */
   43:       err = __file_reparent (dir, MACH_PORT_NULL, &root);
   44:       __mach_port_deallocate (__mach_task_self (), dir);
   45:       if (! err)
   46:         _hurd_port_set (&_hurd_ports[INIT_PORT_CRDIR], root);
   47:     }
   48: 
   49:   return err ? __hurd_fail (err) : 0;
   50: }