On input, a buffer to be filled by completion
of the call. The length of BUF must be at least as long as the value
of NBYTE.
ERRNO
A fullword binary field. If RETCODE is
negative, the field contains an error number. See Socket call error return codes for information about ERRNO return
codes.
RETCODE
A fullword binary field that returns one
of the following values:
Value
Description
0
A 0 return code indicates that the connection is closed and no
data is available.
>0
A positive value indicates the number of bytes copied into the
buffer.