Write a C program to send SIGALRM signal by child process to parent process and parent process make a provision to catch the signal and display alarm is fired.(Use Kill, fork, signal and sleep system call)

#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include<signal.h>
#include<sys/types.h>
#include<sys/wait.h>
#include <stdlib.h>
void Dingdong()
{
printf("Ding!");
exit(1);
}
int main(int argc, char *argv[])
{
if(argc!=3)
{
printf("How much seconds you want to sleep the child process\n");
}
int PauseSecond=(argv[1]);
{
if(fork()==0)
{
printf("waiting for alarm to go off\n");
printf("%d second pause",PauseSecond);
sleep(PauseSecond);
kill(getpid(),SIGALRM);
}
else {
printf("Alarm application starting\n", getpid());
signal(SIGALRM,Dingdong);
printf("done");
}
}
}