source: rtems/c/src/lib/libc/ftruncate.c @ 0bf2ff8

4.104.114.84.95
Last change on this file since 0bf2ff8 was 73f6236, checked in by Joel Sherrill <joel.sherrill@…>, on 03/01/99 at 22:40:08

Patch from Eric Norum <eric@…> to eliminate external
IO handlers scheme that was implemented originally just to support
sockets. The file system IO switch is more general and works fine.

  • Property mode set to 100644
File size: 1.2 KB
Line 
1/*
2 *  ftruncate() - Truncate a File to the Specified Length
3 *
4 *  COPYRIGHT (c) 1989-1998.
5 *  On-Line Applications Research Corporation (OAR).
6 *  Copyright assigned to U.S. Government, 1994.
7 *
8 *  The license and distribution terms for this file may be
9 *  found in the file LICENSE in this distribution or at
10 *  http://www.OARcorp.com/rtems/license.html.
11 *
12 *  $Id$
13 */
14
15#include <unistd.h>
16#include <errno.h>
17
18#include "libio_.h"
19
20int ftruncate(
21  int     fd,
22  off_t   length
23)
24{
25  rtems_libio_t                    *iop;
26  rtems_filesystem_location_info_t  loc;
27 
28  rtems_libio_check_fd( fd );
29  iop = rtems_libio_iop( fd );
30  rtems_libio_check_is_open(iop);
31
32  /*
33   *  Now process the ftruncate() request.
34   */
35 
36  /*
37   *  Make sure we are not working on a directory
38   */
39
40  loc = iop->pathinfo;
41  if ( !loc.ops->node_type )
42    set_errno_and_return_minus_one( ENOTSUP );
43   
44  if ( (*loc.ops->node_type)( &loc ) == RTEMS_FILESYSTEM_DIRECTORY )
45    set_errno_and_return_minus_one( EISDIR );
46
47  rtems_libio_check_permissions( iop, LIBIO_FLAGS_WRITE );
48
49  if ( !iop->handlers->ftruncate )
50    set_errno_and_return_minus_one( ENOTSUP );
51
52  return (*iop->handlers->ftruncate)( iop, length );
53}
54 
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