text: #ifndef GLOBAL
  #define GLOBAL
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <sys/types.h>
  #include <sys/wait.h>
  
  #define NO_ERR 0
  #define PROCESS_ERR -1
  #define READ_ERR -2
  
  
  #endif
  