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

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