The curent one has:
 
       pid=`pidofproc ypbind`
        if [ -n "$pid" ]; then
          echo -n $"Listening for an NIS domain server."
          times=1
          until ypwhich > /dev/null 2>&1 || [ "$times" = "3" ]
          do
             RETVAL=$?
             echo -n "."
             times=$[$times+1]
          done
        fi

It has several problems:

1. If first time ypwhich failes, RETVAL will always be non-zero. 
2. There is no sleep in bewteen. On my network, it may take up to
15 seconds from starting ypbind to working ypwhich.