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/*
* fchdir() - compatible with SVr4, 4.4BSD and X/OPEN - Change Directory
*
* COPYRIGHT (c) 1989-2000.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <unistd.h>
#include <sys/stat.h>
#include <errno.h>
#include <rtems.h>
#include <rtems/libio.h>
#include <rtems/libio_.h>
#include <rtems/seterr.h>
int fchdir(
int fd
)
{
rtems_libio_t *iop;
rtems_filesystem_location_info_t loc, saved;
rtems_libio_check_fd( fd );
iop = rtems_libio_iop( fd );
rtems_libio_check_is_open(iop);
/*
* Now process the fchmod().
*/
rtems_libio_check_permissions( iop, LIBIO_FLAGS_READ );
/*
* Verify you can change directory into this node.
*/
if ( !iop->pathinfo.ops ) {
rtems_set_errno_and_return_minus_one( ENOTSUP );
}
if ( !iop->pathinfo.ops->node_type_h ) {
rtems_set_errno_and_return_minus_one( ENOTSUP );
}
if ( (*iop->pathinfo.ops->node_type_h)( &iop->pathinfo ) !=
RTEMS_FILESYSTEM_DIRECTORY ) {
rtems_set_errno_and_return_minus_one( ENOTDIR );
}
/*
* FIXME : I feel there should be another call to
* actually take into account the extra reference to
* this node which we are making here. I can
* see the freenode interface but do not see
* allocnode node interface. It maybe node_type.
*
* FIXED: T.Straumann: it is evaluate_path()
* but note the race condition. Threads who
* share their rtems_filesystem_current better
* be synchronized!
*/
saved = rtems_filesystem_current;
rtems_filesystem_current = iop->pathinfo;
/* clone the current node */
if (rtems_filesystem_evaluate_path(".", 0, &loc, 0)) {
/* cloning failed; restore original and bail out */
rtems_filesystem_current = saved;
return -1;
}
/* release the old one */
rtems_filesystem_freenode( &saved );
rtems_filesystem_current = loc;
return 0;
}
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