1: /* Change a port cell to a directory in an open file descriptor.
    2:    Copyright (C) 1999, 2002 Free Software Foundation, Inc.
    3:    This file is part of the GNU C Library.
    4: 
    5:    The GNU C Library is free software; you can redistribute it and/or
    6:    modify it under the terms of the GNU Lesser General Public
    7:    License as published by the Free Software Foundation; either
    8:    version 2.1 of the License, or (at your option) any later version.
    9: 
   10:    The GNU C Library is distributed in the hope that it will be useful,
   11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:    Lesser General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU Lesser General Public
   16:    License along with the GNU C Library; if not, write to the Free
   17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   18:    02111-1307 USA.  */
   19: 
   20: #include <errno.h>
   21: #include <unistd.h>
   22: #include <hurd.h>
   23: #include <hurd/port.h>
   24: #include <hurd/fd.h>
   25: #include <fcntl.h>
   26: 
   27: int
   28: _hurd_change_directory_port_from_fd (struct hurd_port *portcell, int fd)
   29: {
   30:   int ret;
   31:   struct hurd_fd *d = _hurd_fd_get (fd);
   32: 
   33:   if (!d)
   34:     return __hurd_fail (EBADF);
   35: 
   36:   HURD_CRITICAL_BEGIN;
   37: 
   38:   ret = HURD_PORT_USE (&d->port,
   39:                        ({
   40:                          int ret;
   41:                          /* We look up "." to force ENOTDIR if it's not a
   42:                             directory and EACCES if we don't have search
   43:                             permission.  */
   44:                          file_t dir = __file_name_lookup_under (port, ".",
   45:                                                                 O_NOTRANS, 0);
   46:                          if (dir == MACH_PORT_NULL)
   47:                            ret = -1;
   48:                          else
   49:                            {
   50:                              _hurd_port_set (portcell, dir);
   51:                              ret = 0;
   52:                            }
   53:                          ret;
   54:                        }));
   55: 
   56:   HURD_CRITICAL_END;
   57: 
   58:   return ret;
   59: }