#include <stdio.h>
#include <termios.h>
#include <sys/ioctl.h>

int getchar_imm() {
	struct termios ts;
	struct termios new_ts;
	int c;
	// read old termios
	ioctl(0, TCGETS, &ts);
	// copy old termios
	new_ts = ts;
	// modify it
	new_ts.c_lflag &= !(ICANON | ECHO); // delete line buffer and echo flag
	new_ts.c_lflag |= ISIG;             // set "send signal on specific keys" flag: ctrl-c, ctrl-z, ctrl-alt-\
	// set it
	ioctl(0, TCSETS, &new_ts);
	// read char
	c = getchar();
	// set old one
	ioctl(0, TCSETS, &ts);
	return c;
}

int main() {
	int c;
	while (EOF != (c = getchar_imm())) {
		printf("Char '%c' (%i)\n", c, c);
	}
	return 0;
}