Parameter values set by the application

SOC-FUNCTION
A 16-byte character field containing READ. The field is left-justified and padded to the right with blanks.
S
A halfword binary number set to the socket descriptor of the socket that is going to read the data.
NBYTE
A fullword binary number set to the size of BUF. READ does not return more than the number of bytes of data in NBYTE even if more data is available.