Get the current terminal control settings
#include <termios.h> int tcgetattr( int fildes, struct termios *termios_p );
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The tcgetattr() function gets the current terminal control settings for the opened device indicated by fildes, and stores the results in the structure pointed to by termios_p.
errno, fpathconf(), ioctl(), tcsetattr(), termios
Chapter 7 of POSIX 1003.1