xdrs
    A pointer to an XDR stream handle created by one of the XDR
    stream-handle creation routines.
 sendnow
    Indicates whether the record should be sent. If sendnow is TRUE,
    xdrrec_endofrecord sends the record by calling the writeit
    routine specified in the call to xdrrec_create. If sendnow is
    FALSE, xdrrec_endofrecord marks the end of the record and calls
    writeit when the buffer is full.