#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>

void myfunc(int signum){
	printf("in handler\n");
	exit(0);
}

void main()
{
	pid_t pid;
	int n;
	if((pid = fork()) == 0){
		signal(SIGUSR1, myfunc);
		pause();
		printf("child pid is %d and parent is %d\n", getpid(), getppid());
	}
	else{

		printf("parent pid is %d\n", getpid());
		printf("child pid is %d\n", pid);
		kill(pid, SIGUSR1);
		wait(NULL);
	}
	exit(0);
}