/*
  kill1.c++ signal from child to parent
*/
#include <iostream>
using namespace std;
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

int main() { // kill1.c++
   int cPID, status ;

   cPID = fork();
   if(cPID == -1){
     perror("fork() failed\n");
     exit(1); 
   }
   if(cPID > 0) {  
      while(1){
          cout << "Parent running...\n";
          sleep(1);
      }
      waitpid(cPID, &status, 0) ;
   }
   else {  // child
       int pPID = getppid();
       
       sleep(5);
       kill(pPID, SIGTSTP);
       cout << "SIGTSTP sent to parent\n";
       sleep(5);
       cout << "SIGCONT sent to parent\n";
       kill(pPID, SIGCONT);
       sleep(5);
       cout << "SIGINT sent to parent\n";
       kill(pPID, SIGINT);
   }
   return 0 ;
}