The z/OS® Communications Server socket API for REXX supports IPv4 and IPv6 socket call instructions.

The REXX socket API uses the REXX built-in function RXSOCKET to access the z/OS Communications Server socket interface. This API provides similar socket functions to those in other high-level languages. When possible, the REXX socket functions match the C socket functions; an example of the corresponding LE C/C++ socket function is included when applicable.