Creating a daemon in Linux

Question

In Linux I want to add a daemon that cannot be stopped and which monitors filesystem changes. If any changes are detected, it should write the path to the console where it was started plus a newline.

I already have the filesystem changing code almost ready but I cannot figure out how to create a daemon.

My code is from here: http://www.yolinux.com/TUTORIALS/ForkExecProcesses.html

What to do after the fork?

int main (int argc, char **argv) {

  pid_t pID = fork();
  if (pID == 0)  {              // child
          // Code only executed by child process    
      sIdentifier = "Child Process: ";
    }
    else if (pID < 0) {
        cerr << "Failed to fork" << endl;
        exit(1);
       // Throw exception
    }
    else                                   // parent
    {
      // Code only executed by parent process

      sIdentifier = "Parent Process:";
    }       

    return 0;
}