Parameter values returned to the application

BUF

The input buffer to receive the data.

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: The socket is closed.
>0: A positive return code indicates the number of bytes copied into the buffer.
-1: Check ERRNO for an error code.