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Darling could potentially be used to run applications compiled for iOS, he writes on the project site.

A developer from Prague named Lubo Doleel is trying to change that with Darling, an emulation layer for OS X.

Darling works by parsing executable files for the Darwin kernel.

Darling needs to provide an ABI-compatible application binary interface set of libraries and frameworks as available on OS X.

Darling is in the early stages, able to run numerous console applications but not much else.

These are indeed the easiest ones to get working, albeit easy is not the right word to describe the amount of work required to achieve that, Doleel said.

Such applications include: Midnight Commander, Bash, VIM, or Apples GCC GNU Compiler Collection.

I know it doesnt sound all that great, but it proves that Darling provides a solid base for further work.

One roadblock is actually getting Mac.dmg and.pkg application files working on a Linux system.

Because doing so isnt that straightforward, Doleel said, Ive written a FUSE module that enables users to mount.dmg files under Linux directly and without root privileges.

Instead of implementing all the system APIs, it was sufficient to create simple wrappers around the ones available on Linux.

I had to check every function for ABI compatibility and then test whether my wrapper works, so it wasnt as easy as it may sound.

Doleel isnt the first to try it, as Darling was initially based on a separate project called maloader.

Doleel said he heard from another group of people who started a similar project before but abandoned the idea due to lack of time.

I have personally looked for something like Darling before, before I realized I would have to start working on it myself, he said.

GNUstep provides several core frameworks to Darling, and the answer to can it run this GUI app heavily depends on GNUstep, Doleel said.

Doleel is the only developer of Darling, using up all his spare time on the project.

If it is someone elses application, I first examine it with one of the tools that come with Darling to see what frameworks and APIs it requires.

I look up the APIs that are missing in Apples documentation; then I create stub functions for them and possibly for the rest of the framework, too.

Stub functions only print a warning when they are called but dont do any real work.).

I also add trace statements into important functions to have an insight into whats happening.

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Many OS X applications seem to contain complete pieces of example code from Apples documentation, presumably because one would have to spend a lot of time getting to understand how the APIs interact.

This is why I appreciate open source so muchwhen the documentation is sketchy, you can always look into the code.

Similar to Wine, Having a list of applications known to be working is probably the best way to go, Doleel said.

I personally use Gentoo Linux, so Im gradually creating a Portage overlay that would compile Darling and all dependencies for both 32-bit and 64-bit applications.

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