source: rtems/c/src/exec/libcsupport/src/ioctl.c @ 2d733c42

4.104.114.84.95
Last change on this file since 2d733c42 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: 1.3 KB
Line 
1/*
2 *  ioctl() system call
3 *
4 *  This routine is not defined in the POSIX 1003.1b standard but is
5 *  commonly supported on most UNIX and POSIX systems.
6 *
7 *  COPYRIGHT (c) 1989-1998.
8 *  On-Line Applications Research Corporation (OAR).
9 *  Copyright assigned to U.S. Government, 1994.
10 *
11 *  The license and distribution terms for this file may be
12 *  found in the file LICENSE in this distribution or at
13 *  http://www.OARcorp.com/rtems/license.html.
14 *
15 *  $Id$
16 */
17
18#include "libio_.h"
19
20int ioctl(
21  int         fd,
22  unsigned32  command,
23  void *      buffer
24)
25{
26  rtems_status_code  rc;
27  rtems_libio_t     *iop;
28
29  rtems_libio_check_fd( fd );
30  iop = rtems_libio_iop( fd );
31  rtems_libio_check_is_open(iop);
32
33  /*
34   *  If this file descriptor is mapped to an external set of handlers,
35   *  then pass the request on to them.
36   */
37
38  if ( iop->flags & LIBIO_FLAGS_HANDLER_MASK ) {
39    rtems_libio_ioctl_t fp;
40
41    fp = rtems_libio_handlers[
42           (iop->flags >> LIBIO_FLAGS_HANDLER_SHIFT) - 1].ioctl;
43    if ( fp == NULL )
44      set_errno_and_return_minus_one( EBADF );
45
46    return (*fp)( fd, command, buffer );
47  }
48
49  /*
50   *  Now process the ioctl().
51   */
52
53  if ( !iop->handlers->ioctl )
54    set_errno_and_return_minus_one( ENOTSUP );
55
56  rc = (*iop->handlers->ioctl)( iop, command, buffer );
57
58  return rc;
59}
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