UNIX socket APIs

The UNIX socket APIs that support both IPv4 and IPv6 communications are z/OS® UNIX Assembler Callable Services and z/OS C sockets.

z/OS UNIX Assembler Callable Services

z/OS UNIX Assembler Callable Services is a generalized call-based interface to z/OS UNIX IP sockets programming. This API supports both IPv4 and IPv6 communications. It includes support for the basic IPv6 API features and for a subset of the advanced IPv6 API features. For more information, see z/OS UNIX System Services Programming: Assembler Callable Services Reference.

z/OS C sockets

z/OS UNIX C sockets is used in the z/OS UNIX environment. Programmers use this API to create applications that conform to the POSIX or XPG4 standard (a UNIX specification). This API supports both IPv4 and IPv6 communications. It includes support for the basic IPv6 API features and for a subset of the advanced IPv6 API features. For more information about this API, see z/OS XL C/C++ Runtime Library Reference.