Notes

The maximum number of sockets that can be created globally in the DC/UCF system, and the maximum number of sockets that can be created by a single task in the DC/UCF system can be controlled:
- At startup, through the MAXIMUM NUMBER OF SOCKETS and the MAXIMUM NUMBER OF SOCKETS PER TASK clause from the TCP/IP system generation statement.
- Dynamically, through the DCMT VARY TCP/IP command.
For more information:
- About the TCP/IP system generation statement, see the CA IDMS System Generation Quick Reference Guide.
- About the DCMT VARY TCP/IP command, see the CA IDMS System Tasks and Operator Commands Guide.
The following table lists the domains that can be specified. The EQUate symbol is generated by the are located in the SOCKET-MISC-DEFINITIONS record.

EQUate Symbol	Field Name	Description

AF@INET*	SOCKET-FAMILY-AFINET	AF_INET address family
AF@INET6	SOCKET-FAMILY-AFINET6	AF_INET6 address family
z/VSE systems: —Only supports DOMAIN=AF@INET*

The following table lists the socket types that can be specified. The EQUate symbol is generated by the in the SOCKET-MISC-DEFINITIONS record.

EQUate Symbol	Field Name	Description

STREAM*	SOCKET-TYPE-STREAM	Stream—Connection oriented and reliable
DATAGRAM	SOCKET-TYPE-DATAGRAM	Datagram—Connectionless and unreliable
z/VSE systems: *—Only supports TYPE=STREAM.

The following table lists the protocols that can be specified. The EQUate symbol is generated by the SOCKET-MISC-DEFINITIONS record.

EQUate Symbol	Field Name	Description

PROTIP	SOCKET-PROTOCOL-IP	Default protocol
PROTTCP*	SOCKET-PROTOCOL-TCP	TCP protocol
PROTUDP	SOCKET-PROTOCOL-UDP	UDP protocol
PROTIPV6	SOCKET-PROTOCOL-IPV6	IPv6 protocol
z/VSE systems: *—Only supports PROTNUM=PROTTCP

PL/I programs: The SOCKET_MISC_DEFINITIONS is used and the dashes are replaced by underscores.