Clear data at serial port in Linux in C?

Answer 1

Either your comment or your code is wrong:

// Set the baud rates to 19200... 
cfsetispeed(&options, B9600); 
cfsetospeed(&options, B9600); 

This says it will be setting the baud rate to 19200, but it really sets it to 9600. Maybe you want this:

// Set the baud rates to 19200... 
cfsetispeed(&options, B19200);
cfsetospeed(&options, B19200);