Parameter values set by the application

SOC-FUNCTION: A 16-byte character field containing LISTEN. The field is left-justified and padded to the right with blanks.
S: A halfword binary number set to the socket descriptor.
BACKLOG: A fullword binary number set to the number of communication requests to be queued.
Rule: The BACKLOG value specified on the LISTEN call is limited to the value configured by the SOMAXCONN statement in the stack's TCPIP PROFILE (default=10); no error is returned if a larger backlog is requested. SOMAXCONN might need to be updated if a larger backlog is desired. see z/OS Communications Server: IP Configuration Reference for details.