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