termios interface question

I'm programming an ARM's UART that comes with a library implementing the standard unix termios interface.

Regarding termios, I have following trouble:

When I do following syscall:

It is placing myStr into an output buffer, implemented in the driver, that will send out all bytes through the UART.

I wonder if there is any way by which, using the termios interface, I can know when all bytes have been sent through the UART.

I need it because my hardware needs to have one line enabled during UART transmission (for an RS485 driver).

Thanks,-

I am not very sure...but try using the IOCTL call for this.


Raghu