Rawmode Serial port programming

#include <stdio.h>
#include <unistd.h>
#include <termios.h>
#include <ctype.h>
#define QUIT_CHAR 0x04 // Ctrl+D --> quit

struct termios CookedTermIos; // for cooked mode
struct termios RawTermIos; // for raw mode

int main(void)
{
 char c;
 // save present terminal setting
 tcgetattr(STDIN_FILENO, &CookedTermIos);

 // Create raw mode terminal setting 
 RawTermIos = CookedTermIos;
 cfmakeraw(&RawTermIos);

 // Set 
 tcsetattr(STDIN_FILENO, 0, &RawTermIos);

 while((c = getchar()) != QUIT_CHAR )
 {
  if(isprint(c)){
   printf("you push key: ");
   putchar(c);
   putchar('\n');
  }else{
   printf("control key <%02X> \n" , c);
   if(c == '\n') fputs("\r\n", stdout);
  }
 }

 tcsetattr(STDIN_FILENO, 0, &CookedTermIos);
 putchar('\n');

 return 0;
}