sysdeps/mach/hurd/chroot.c

   1 /* Copyright (C) 1991, 1992, 1993, 1994 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <stddef.h>
  22 #include <unistd.h>
  23 #include <hurd.h>
  24 #include <fcntl.h>
  25 #include <hurd/port.h>
  26
  27 /* Change the current root to FILE_NAME.  */
  28 int
  29 DEFUN(chroot, (file_name), CONST char *file_name)
  30 {
  31   file_t file, dir;
  32   error_t err;
  33
  34   file = __file_name_lookup (file_name, O_EXEC, 0);
  35   if (file == MACH_PORT_NULL)
  36     return -1;
  37   err = __USEPORT (CRDIR, __hurd_file_name_lookup (port, file, "",
  38                                                    O_EXEC, 0, &dir));
  39   __mach_port_deallocate (__mach_task_self (), file);
  40   if (err)
  41     return __hurd_fail (err);
  42
  43   _hurd_port_set (&_hurd_ports[INIT_PORT_CRDIR], dir);
  44   return 0;
  45 }