Executing code at module unload

[Lexy Zhitenev]

Hi folks.

I have to write a C module which pings machines using Microsoft ICMP
library.

Unfortunately, 'ping' package written in Python won't work for me. (I can't
create SOCK_RAW sockets).

So, I do WSAStartup, LoadLibrary and etc on import of this module. This is
easy. But I have to call FreeLibrary, WSACleanup when I stop using this
module.

How to accomplish this? In Python I do the following:

...
class __Cleanup:
    def __del__(self):
        # Cleaning up
        pass

__cup = Cleanup()

So, this code is executed in current module scope and only when it is
unloaded. How to do this in C?

Regards, Lexy.