I&#39;m porting a relatively simple console program written for Unix to the Windows platform ([Visual C++ 8.0][1]). All the source files include &quot;unistd.h&quot;, which doesn&#39;t exist.  Removing it, I get complaints about misssing prototypes for &#39;srandom&#39;, &#39;random&#39;, and &#39;getopt&#39;.
I know I can replace the random functions, and I&#39;m pretty sure I can find/hack-up a getopt implementation.  

But I&#39;m sure others have run into the same challenge. 
My question is: is there a port of &quot;unistd.h&quot; to Windows? At least one containg those functions which do have a native Windows implementation - I don&#39;t need pipes or forking.

**EDIT**:

I know I can create my very own &quot;unistd.h&quot; which contains replacements for the things I need - especially in this case, since it is a limited set. But since it seems like a common problem, I was wondering if someone had done the work already for a bigger subset of the functionality.
  
Switching to a different compiler or environment isn&#39;t possible at work - I&#39;m stuck with Visual Studio.

  [1]: http://en.wikipedia.org/wiki/Visual_C++#32-bit_versions


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Is there a replacement for unistd.h for Windows (Visual C)?