Parent not ignoring chiild process

I've got this function which is supposed to return to the calling main if amp is 1 without waiting for the child to finish. When it returns, it's supposed to show a prompt but it doesn't show anything?

int my_system(char** argv,int amp) 
{
  int pid=0;
  int status;
  if(amp)
  {
      signal(SIGCHLD, SIG_IGN);
  }     
  pid = fork();
  if(pid==0)
    execvp(argv[0], argv);
  else if(pid>0)
  {
  if(amp==0)
  {
    wait(&status);
    if(status>=0)
       return 0;
    else
        exit(EXIT_FAILURE);
  }
   else 
   {
        return 0;
    }
}

}