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Can I write libPOSIX for Windows (Win32) without having to download a background service or DLL?

I know about Cygwin, and I know about its flaws. I also know about slowness fork, but not about why on Earth it is impossible to get around. I also know that Cygwin requires a DLL. I also understand that POSIX defines the whole environment (shell, etc.), which is not exactly what excites me here.

My question asks if there is another way to solve the problem. I see more and more POSIX features implemented in MinGW projects, but there is no complete solution providing full-scale (comparable to Linux / Mac / BSD implementation) POSIX functionality.

The question really comes down to: Is it possible to efficiently use the Win32 API (like the MSVC20?) To provide a full POSIX level over the Windows API?

Perhaps it will be full libc, which only enters the OS library for low-level things, such as file system access, threads, and process control. But I don’t know exactly what POSIX consists of. I doubt the library can turn Win32 into POSIX compatible.

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POSIX <> Win32.

If you are trying to write POSIX-targeted applications, why aren't you using any * N * X option? If you prefer to run Windows, you can run Linux / BSD / whatever inside Hyper-V / VMWare / Parallels / VirtualBox on your PC / laptop, etc.

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