Someone

#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

// prototype
static void sig_handler(int);

int main() {

  int i;
  int parent_pid;
  int child_pid;
  int status;

  if( signal(SIGHUP, sig_handler) == SIG_ERR)
    printf("Parent: Unable to create handler for SIGHUP\n");

  // Getting the parents process id
  parent_pid = getpid();

  // Spawn the child process and get the process id.
  if ((child_pid = fork()) == 0) {
    printf("Child: This is the child --> %d \n", child_pid);
    printf("Child: Sending SIGHUP to parent \n");
    kill(parent_pid, SIGHUP);
    exit(0);
  }
  else {
    printf("Parent: Waiting for child to exit\n");
    wait(&status);
    printf("Parent: Process completed\n");
  }

}


// Signal Handler
static void sig_handler(int signo) {
  printf("Signal is recieved!");
  switch (signo) {
  case SIGHUP: /* Incoming signal is SIGHUP signal */
    printf("---> SIGHUP recieved");
    break;
  }
  return;
}