SHELL UNIX LINUX PROGRAM TO IMPLEMENT SIGNAL

#include <stdio.h>     
#include <unistd.h>    
#include <signal.h>    
void catch_int(int sig_num)
{
    signal(SIGINT, catch_int);
    printf("Don't do that\n");
    fflush(stdout);
}

int main(int argc, char* argv[])
{
    /* set the INT (Ctrl-C) signal handler to 'catch_int' */
    signal(SIGINT, catch_int);

    /* now, lets get into an infinite loop of doing nothing. */
    for ( ;; )
        pause();
}


Output:

[csuser@localhost ~]$ vi sig.c
[csuser@localhost ~]$ gcc sig.c
[csuser@localhost ~]$ ./a.out
^CDon't do that
^Z
[1]+  Stopped                 ./a.out