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/*
* ftruncate() - Truncate a File to the Specified Length
*
* COPYRIGHT (c) 1989-1999.
* 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.
*
* $Id$
*/
#include <unistd.h>
#include <errno.h>
#include "libio_.h"
int ftruncate(
int fd,
off_t length
)
{
rtems_libio_t *iop;
rtems_filesystem_location_info_t loc;
rtems_libio_check_fd( fd );
iop = rtems_libio_iop( fd );
rtems_libio_check_is_open(iop);
/*
* Now process the ftruncate() request.
*/
/*
* Make sure we are not working on a directory
*/
loc = iop->pathinfo;
if ( !loc.ops->node_type )
set_errno_and_return_minus_one( ENOTSUP );
if ( (*loc.ops->node_type)( &loc ) == RTEMS_FILESYSTEM_DIRECTORY )
set_errno_and_return_minus_one( EISDIR );
rtems_libio_check_permissions( iop, LIBIO_FLAGS_WRITE );
if ( !iop->handlers->ftruncate )
set_errno_and_return_minus_one( ENOTSUP );
return (*iop->handlers->ftruncate)( iop, length );
}
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