gtpc1m0o | Transmission Control Protocol/Internet Protocol |
The Common Link Access to Workstation (CLAW) device table is a TCP/IP control block structure located in main storage that contains information about each CLAW workstation defined in the TPF system. The CDT is also saved on file to preserve changes made to the core copy of the CDT across an initial program load (IPL). Whenever a CLAW workstation is added to the TPF system using a ZCLAW ADD command, an entry is added to the CLAW device table.
See TPF Operations for more information about the ZCLAW ADD command and for restrictions on its use.
The CLAW device table contains information such as adapter ID, workstation name, workstation application, host application, symbolic device address (SDA), and device status.
An entry is deleted from the CDT by using the ZCLAW DELETE command.
Each TPF host processor in the TPF system has its own unique CDT. Therefore, the CDT contents are not necessarily consistent across all of the processors in a loosely coupled TPF system.
See TPF Operations for more information about the ZCLAW DELETE command and for restrictions on its use.
There are many CLAW control block structures associated with the CDT. These control blocks are obtained by the TCP/IP support during CLAW I/O processing and returned to the system at various times during the I/O processing using a claw_closeadapter feature. See claw_closeadapter -- Terminate CLAW Activity on Subchannel Pair for a description of the claw_closeadapter function.