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hurdfchdir.c

/* Change a port cell to a directory in an open file descriptor.
   Copyright (C) 1999, 2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <errno.h>
#include <unistd.h>
#include <hurd.h>
#include <hurd/port.h>
#include <hurd/fd.h>
#include <fcntl.h>

int
_hurd_change_directory_port_from_fd (struct hurd_port *portcell, int fd)
{
  int ret;
  struct hurd_fd *d = _hurd_fd_get (fd);

  if (!d)
    return __hurd_fail (EBADF);

  HURD_CRITICAL_BEGIN;

  ret = HURD_PORT_USE (&d->port,
                   ({
                   int ret;
                   /* We look up "." to force ENOTDIR if it's not a
                      directory and EACCES if we don't have search
                      permission.  */
                   file_t dir = __file_name_lookup_under (port, ".",
                                                O_NOTRANS, 0);
                   if (dir == MACH_PORT_NULL)
                     ret = -1;
                   else
                     {
                       _hurd_port_set (portcell, dir);
                       ret = 0;
                     }
                   ret;
                   }));

  HURD_CRITICAL_END;

  return ret;
}

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