termios support

[Geoffroy Montel]

Hi

> =============================================================
> void
> device_write_routine (int minor, char *buf, int count)
> {
>         UART->output_register = *buf;
>         UART->control_register |= UART_TRANSMIT_INTERRUPT_ENABLE;
> }
> 
> void
> device_transmit_interrupt_routine (int vector)
> {
>         UART->control_register &= ~UART_TRANSMIT_INTERRUPT_ENABLE;
>         rtems_termios_dequeue_characters (device_ttyp, 1);
> }
> =============================================================

I'm satisfied with this piece of code. It prevents from adding a call
to the
driver in termios.

But, wouldn't it be better if 
void rtems_termios_dequeue_characters (void *ttyp, int len)
would be stg like
int rtems_termios_dequeue_characters (void *ttyp, int len)
and we'd return the state of the buffer ? (for instance, 0 when it's
empty
so that we stop the interrupts then, and 1 otherwise)

Thanks Eric!

Geoffroy
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