source: rtems/c/src/lib/libc/close.c @ ee733965

4.104.114.84.95
Last change on this file since ee733965 was 2d733c42, checked in by Joel Sherrill <joel.sherrill@…>, on 01/20/99 at 15:48:22

More general fix based on bug report and patch from Ian Lance Taylor
<ian@…> to fix this problem:

There is a small bug in rtems_close in c/src/lib/libc/libio.c. It
does not check whether the file descriptor it is passed is open. This
can cause it to make a null dereference if it is passed a file
descriptor which is in the valid range but which was not opened, or
which was already closed.

  • Property mode set to 100644
File size: 1.4 KB
Line 
1/*
2 *  close() - POSIX 1003.1b 6.3.1 - Close a File
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 "libio_.h"
16
17int close(
18  int  fd
19)
20{
21  rtems_libio_t      *iop;
22  rtems_status_code   rc;
23  int                 status;
24
25  rtems_libio_check_fd(fd);
26  iop = rtems_libio_iop(fd);
27  rtems_libio_check_is_open(iop);
28  if ( iop->flags & LIBIO_FLAGS_HANDLER_MASK ) {
29    int (*fp)(int  fd);
30
31    fp = rtems_libio_handlers[
32            (iop->flags >> LIBIO_FLAGS_HANDLER_SHIFT) - 1].close;
33    if ( fp == NULL )
34      set_errno_and_return_minus_one( EBADF );
35    status = (*fp)( fd );
36    return status;
37  }
38
39  if ( !iop->handlers )
40    set_errno_and_return_minus_one( EBADF );
41
42  if ( !iop->handlers->close )
43    set_errno_and_return_minus_one( ENOTSUP );
44
45  rc = (*iop->handlers->close)( iop );
46
47  rtems_libio_free( iop );
48
49  if (rc != RTEMS_SUCCESSFUL)
50    set_errno_and_return_minus_one( rc );
51
52  return rc;
53}
54
55/*
56 *  _close_r
57 *
58 *  This is the Newlib dependent reentrant version of close().
59 */
60
61#if defined(RTEMS_NEWLIB)
62
63#include <reent.h>
64
65int _close_r(
66  struct _reent *ptr,
67  int            fd
68)
69{
70  return close( fd );
71}
72#endif
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