sysdeps/mach/hurd/chroot.c

   1 /* Copyright (C) 1991, 92, 93, 94, 95, 97 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 not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <stddef.h>
  21 #include <unistd.h>
  22 #include <hurd.h>
  23 #include <fcntl.h>
  24 #include <hurd/port.h>
  25
  26 /* Change the current root to FILE_NAME.  */
  27
  28 /* XXX shouldn't this be __chroot? */
  29 int
  30 chroot (file_name)
  31      const char *file_name;
  32 {
  33   error_t err;
  34   file_t file, dir, root;
  35
  36   file = __file_name_lookup (file_name, O_EXEC, 0);
  37   if (file == MACH_PORT_NULL)
  38     return -1;
  39   dir = __file_name_lookup_under (file, "", O_EXEC, 0);
  40   __mach_port_deallocate (__mach_task_self (), file);
  41   if (dir == MACH_PORT_NULL)
  42     return -1;
  43
  44   /* Prevent going through DIR's .. */
  45   err = __file_reparent (dir, MACH_PORT_NULL, &root);
  46   __mach_port_deallocate (__mach_task_self (), dir);
  47   if (err)
  48     return __hurd_fail (err);
  49
  50   _hurd_port_set (&_hurd_ports[INIT_PORT_CRDIR], root);
  51   return 0;
  52 }