Line Discipline or Termios lacks ?

[Thomas Doerfler]

Hi,

> 
> Ok, I want to do this !! :-) But I don't found how
> termios_ioctl will call my private driver ioctl
> function.
> 
> Termios_icotl have a switch(command) :
> case KnwonCommand1 :
> case KnwonCommand2 :
> case KnwonCommand3 :
> default : Call line discipline ioctl function

Well, I would not change the termios code, but intercept the 
ioctl call in your private driver. 

Whenever an application performs an ioctl call for a specific 
device, then the RTEMS io system calls the "ioctl" function in 
the device driver (e.g. "console_ioctl"). A "nomal" driver 
supporting "termios" will only hand through that call to 
termios_ioctl, in that case the drivers "ioctl" function looks 
like:



/*
 * Handle ioctl request.
 */
rtems_device_driver console_control(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void                    * arg
)
{ 
  return rtems_termios_ioctl (arg);
}

In your case, you should intercept your own ioctl code in this 
function, so you would change it to:

/*
 * Handle ioctl request.
 */
rtems_device_driver console_control(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void                    * arg
)
{ 
  rtems_status_code rc;
  rtems_libio_ioctl_args_t *args = arg;

  switch(args->command) {
    case_MY_IOCTL_CODE_TO_ENABLE_RTS:
      rc = console_enable_rts(arg);
      break;
    case_MY_IOCTL_CODE_TO_DISABLE_RTS:
      rc = console_disable_rts(arg);
      break;
    default: 
      rc = rtems_termios_ioctl (arg);
      break;
  }
  return rc;
}


Does this help a bit?

wkr,
	Thomas.


> 
> So How can I do, that's what I don't understand and
> found a solution to do this and use termios ?
> 
> > wkr,
> > 	Thomas.
>  
>  
> 
> 
> 
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