Windows' kbhit() ported to POSIX systems

posix_kbhit.c

#include <unistd.h> // STDIN_FILENO
#include <termios.h> //tcsetattr/tcgetattr
#include <sys/ioctl.h> // ioctl

int kbhit(){
	struct termios term;
	tcgetattr(STDIN_FILENO, &term);
	struct termios term2 = term;
	term2.c_lflag &= ~ICANON; // disable canonical mode
	tcsetattr(STDIN_FILENO, TCSANOW, &term2);
	int byteswaiting;
	ioctl(STDIN_FILENO, FIONREAD, &byteswaiting);
	tcsetattr(STDIN_FILENO, TCSANOW, &term); // restore original terminal settings
	return byteswaiting /* > 0 */;
}