I&#39;m having issues getting the C sockets API to work properly in C++ on z/OS.

Although I am including `sys/socket.h`, I still get compile time errors telling me that `AF_INET` is not defined.

Am I missing something obvious, or is this related to the fact that being on z/OS makes my problems much more complicated?

I discovered that there is an `#ifdef` that I&#39;m hitting. Apparently z/OS isn&#39;t happy unless I define which &quot;type&quot; of sockets I&#39;m using with:

    #define _OE_SOCKETS

Now, I personally have no idea what this `_OE_SOCKETS` is actually for, so if any z/OS sockets programmers are out there (all 3 of you), perhaps you could give me a rundown of how this all works?


Test App

    #include &lt;sys/socket.h&gt;

    int main()
    {
        return AF_INET;
    }


Compile/Link Output:

    cxx -Wc,xplink -Wl,xplink -o inet_test inet.C

    &quot;./inet.C&quot;, line 5.16: CCN5274 (S) The name lookup for &quot;AF_INET&quot; did not find a declaration.
    CCN0797(I) Compilation failed for file ./inet.C. Object file not created.

A check of sys/sockets.h does include the definition I need, and as far as I can tell, it is not being blocked by any `#ifdef` statements.

I have however noticed it contains the following:

    #ifdef __cplusplus
      extern &quot;C&quot; {
    #endif

which encapsulates basically the whole file? Not sure if it matters.

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How to use the C socket API in C++ on z/OS