TCP/IP API Support › Using TCP/IP with CA IDMS

Using TCP/IP with CA IDMS

TCP/IP is an industry standard communications protocol. In order to understand this section, you should be familiar with the terminology and base concepts of TCP/IP. Tutorials on TCP/IP can be found on the Internet by doing a search on a general search web site with keywords "TCP/IP" and "tutorial."

CA IDMS exploits TCP/IP in the following ways:

• An online application can use the TCP/IP socket program interface to communicate with another TCP/IP application, possibly on another platform.
• Remote applications can directly access a central version and start an online task.

A "communication" consists of two socket programs exchanging messages. The program that initiates a service request is the client. The program receiving incoming requests is the server.

Typically, the client communicates with one server at a time. However, a server processes requests from multiple clients. The server type depends on how the client requests are processed:

• Iterative server—Accepts a single client request, processes it and returns the result to the client and waits for the next client request.
• Concurrent server—Accepts a client requests and spawns a "child" task to process it.

CA IDMS TCP/IP functionality is available for these operating systems:

• z/OS
• z/VSE
• z/VM

Note: The following limitations are associated with the z/VSE implementation of TCP/IP:

• Domains—Only AF_INET is supported.
• Protocol—Only TCP is supported.
• Sockets—Only streaming sockets are supported.