fork();
                  
                  
                  if (pid < 0) {
                  
                  
                      error();
                  
                  
                  } else if (pid == 0) {
                  
                  
                      exec();
                  
                  
                      error();
                  
                  
                      exit(EXIT_FAILURE);
                  
                  
                  }
                  
                  
                  
                  
                  
                  wait();
                  
                  
                
so pid should be 0. i just checked for -1
and what is that wait?
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