hurd/fchroot.c

   1 /* Copyright (C) 1991, 92, 93, 94, 95, 96 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 <unistd.h>
  21 #include <hurd.h>
  22 #include <hurd/fd.h>
  23 #include <fcntl.h>
  24
  25 /* Change the current root directory to FD.  */
  26 int
  27 DEFUN(fchroot, (fd), 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, "", O_EXEC, 0);
  35                           dir == MACH_PORT_NULL ? errno : 0;
  36                         }));
  37
  38   if (! err)
  39     _hurd_port_set (&_hurd_ports[INIT_PORT_CRDIR], dir);
  40
  41   return err ? __hurd_fail (err) : 0;
  42 }