send RS232 break

I have 4 NIOS serial port's

NIOS serial driver version 0.0
ttyS0 (irq = 7) is a builtin NIOS UART
ttyS1 (irq = 8) is a builtin NIOS UART
ttyS2 (irq = 9) is a builtin NIOS UART
ttyS3 (irq = 10) is a builtin NIOS UART
Serial: JTAG UART driver $Revision: 1.3 $

i can only use the open,close and write function's

hoe to write a application that send a break?

which file must i include?

please help me i got a few weeks to graduate http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/huh.gif