Programming

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <signal.h>
#include <termios.h>

void sig_handler(int signo) {
    char key;
    
    read(STDIN_FILENO, &key, 1);
    printf("Key %c\n", key);
}

int main(int argc, char** argv) {
    int y = 1;
    struct termios raw;
    
    if (tcgetattr(STDIN_FILENO, &raw) < 0)
        return 1;
    
    /* raw input */
    raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
    
    /* 8bits per char */
    raw.c_cflag |= (CS8);
    
    /* turn off echoing */
    raw.c_lflag &= ~(ECHO | ICANON | IEXTEN);
    
    if (tcsetattr(STDIN_FILENO , TCSAFLUSH, &raw) < 0)
        return 1;
    
    
    /* async IO handling for stdin */
    if (ioctl(STDIN_FILENO, FIOASYNC, &y) == -1)
        return 1;
    
    if (signal(SIGIO, sig_handler) == SIG_ERR)
        return 1;
    
    while(1)
        sleep(1);

    return (EXIT_SUCCESS);
}

  while(1)
    {
        printf("Other program Processing Stuff Here. \n");
            sleep(1);
    }