This function closes the hosts database file
    (TCPIP$ETC:IPNODES.DAT), previously opened with a
    gethostbyaddr(), gethostent(),  or gethostbyname() function call.
    If the most recent sethostent() function call is executed with
    a nonzero stay_open parameter, the endhostent() function does
    not close the hosts database file. You cannot close the hosts
    database file until you make a call to exit(). A second call
    to sethostent() is issued with a stay_open parameter equal
    to 0 (zero). This ensures that a subsequent endhostent() call
    succeeds.
    Related Functions
    See also gethostbyaddr(), gethostent(),  and gethostbyname().