WineHQ
We have chats with members of the Wine community.

Interviews

22 July 2003
Interview with Jon Griffiths by Brian Vincent

This is our 10th interview with Wine developers. Check out the Interviews page for previous ones.

Jon Griffiths gets my vote for having the most interesting life of any Wine developer. He was born in England but has lived most of his life in Auckland, New Zealand. He considers himself a Kiwi and his English friends agree. He left New Zealand six years ago for a working "holiday". (For the American readers out there, this is an extended vacation many folks from Australia or New Zealand take. It often lasts somewhere between several months and their entire lives.)

Jon attended Waikato University in Hamilton, New Zealand and earned a degree in psychology and computer science. For the most part he's been traveling for the past few years. He does admit to doing some work, including converting a friend's Internet cafe from Windows NT to Linux. Aside from programming, his other hobbies include playing guitar and singing. He's also willing to read any book that happens to be laying around.

BV: How did you get involved with Wine?

Jon: I followed Wine's development for a very long time before I really got involved, mostly because the scope and complexity of the project intrigued me, also because politically I have always wanted a viable alternative to Windows to become available.

I started contributing code about three years ago, when my circumstances allowed, and I saw an area that obviously needed work and I could contribute to (the C runtime).

BV: Do you remember the first patch you submitted?

Jon: Yes, it was an update to crtdll (whose implementation was later migrated into msvcrt.dll). I spent a while hacking around on it before I decided to actually send it. The peer review process was initially quite daunting since at that time it seemed there was only a small group of core workers, who all had a lot of experience and weren't afraid to be blunt if they didn't like something. But eventually I had too much code to just let it bit-rot, and sent it off.

BV: Could you give a little background on MS's C runtime? A lot of people just suggest using the MS implementation for the time being. Is Wine developed enough to worry about that library?

Jon: The C run time originated with crtdll.dll, which was a relatively lightweight, single threaded version of the run time. This migrated into msvcrt, which is multithreaded and provides a much bigger range of standard C functions, and also support routines for MSVC C++ applications. This includes RTTI (Run time type information, used to dynamically cast objects from one type to another), and exception handling. The C compiler and run-time are linked in that using certain features of C++ relyies on this support.

The dll is a part of every standard Windows install, and it exists in many different versions since it is pretty essential that bugs in it get fixed.

Every application developed with MS tools uses this dll (unless they take special care not to, for some reason). This includes all the MFC apps in existence, so I'd say it's pretty important for Wine to provide a reasonably up to date implementation of it. Although the native dll can be redistributed, the native version may not always work better than our version, depending on what calls it makes to implement a given function. For example, until a few months ago, the latest versions of native msvcrt wouldn't even load in Wine, due to it getting a too low version number from one of ntdlls version API calls. Even now there is a problem with memory management using this version of the dll, although I haven't tracked down what it is doing with heap allocation that could be the cause.

I guess I don't really consider the C run time to be peripheral. Can you imagine a linux distribution that didn't come with glibc? ;-)

BV: What areas of Wine do you like to work on?

Jon: My current preference is anything undocumented. I like discovering how a piece of code works, then finding out how best to replicate its functionality. I also like to work around the same areas since it's satisfying to watch something move towards completion. But occasionally I randomly pick something for a change and work on that for a while. Just recently I started some OLE work which snowballed into enough code that i haven't figured out how to merge it yet!

BV: Wine needs more masochistic developers working on undocumented stuff.

Jon: Agreed! Actually Wine just needs more developers, period. So, any lurkers out there, start sending your patches now!.

BV: So what motivated the recent OLE work, were you trying to solve a particular problem?

Jon: No, I just looked around and saw that considering how old the basic OLE framework is, Wine's implementation looked way too incomplete.

BV: What kind of development environment do you use?

Jon: For Wine hacking I'm basically a command line guy, using vim or kate as my editor. I do 99% of my work under Linux. When I'm hacking on private projects I usually use KDevelop, it's a great integrated environment, and I'd love to see it have more customization for Winelib development so it could function as a Visual Studio replacement.

BV: You mean integrate something into KDevelop to build Winelib apps? Something like reading in MSVC projects and building with Wine?

Jon: Exactly that. Being able to generate resource files from QT designer, integrating the API documentation, having appwizards for Winelib projects, that sort of thing. I have to upgrade to gideon (the new source base of KDevelop) before I can look at any of that though. And to upgrade my system I first want to clear my patch queue :-)

BV: It seems like a bunch of your recent patches reference building under MSVC. Do you spend a lot of time testing under Windows?

Jon: I hardly ever use Windows, but for testing purposes I will boot it up if I have to. The recent VC patches came about as a result of my writing a script to convert Wine's makefiles (that control the building of the various software components by winebuild/gcc etc), into makefiles suitable for nmake (used by msvc). This naturally led to fixes for the build process under Microsoft's tools. The VC command line tools actually run under Wine quite well.

BV: From time to time you resurface with a ton of patches. It happened about a year ago and then again this week. Why do you go so long between syncing up?

Jon: I've been travelling in SE Asia (on holiday) for the last 3 years, and so it's hard for me to sync up. Often when I come to send my patches someone has modified the same files as I did, so I have to merge our work together and re-test before I can send. I usually manage to get synced every few months (my last set of patches was in mid March), but it does depend where I am and what I'm doing.

Also my patches tend to be big, and sometimes significant parts don't get applied because of a small part of the patch that could be cleaner. That's why you occasionally see someone reworking a patch of mine and resubmitting part of it while I'm off in cyber-limbo.

I have to send my patches from Internet cafes, which is sometimes a hassle to set up with limited time. This current merge is being sent from Khao San Rd in Bangkok, Thailand, for example. I'm looking for work here, so I expect this situation will change when I get a job (and an Internet connection), and can send smaller patches more regularly.

BV: Three years on holiday seems like more than a "holiday". What countries have you gone to?

Jon: You're right, it's fairly gratuitous! I figured most people do their travelling later in life, and thought I should travel while still young(ish).

Since I stopped work I traveled the UK, went to Ireland, Holland, Germany, the Czeck Republic, back home to New Zealand, Laos, Cambodia and Thailand. Previously I have been through Europe and Africa.

I just turned 30, and I will start work again sometime this year, where upon I expect I will be hit by the urge to travel again, but I'll have to resist.

BV: Are you specifically looking for software development work? How's the IT industry in Thaliand doing?

Jon: Yes, I am, preferably in the financial sector, since that's my previous experience. The industry here is huge, but the incomes are not very high. Luckily, It is cheap to live here (you can rent a small apartment for around US$150 a month, for example).

BV: What's been the favorite place you've visited?

Jon: Thailand as a whole is a great place, with wonderful people and a fascinating (although tongue twisting) language. That's why I'd like to stay here a bit longer. I also really liked Prague, because it's charming and very lively. But given the weather here, Thailand is the clear winner!

One of the nice things about travelling is the variety of experiences and people you get to meet. But there isn't enough time here to relate all of that. It's something that's best experienced oneself, I think.

BV: SARS made the news here, but it wasn't too big a deal. Were you affected by SARS at all? It seems like businesses may have closed or travel may have been restricted.

Jon: Tourism was badly affected by both SARS and the Bali bombings, but Thailand escaped actually having an epidemic with a pretty good government response (quarantine, heath screening at airports, etc). A lot of Thais took to wearing surgical masks which was quite funny, but on the whole no-one really seemed to feel that threatened. As far as tourists go the biggest danger here is a Bali style attack, since security here is relatively light at the majority of tourist hangouts.

BV: I imagine getting Internet access is a challenge. Have you noticed improvement in the last few years?

Jon: Actually, getting net access is easy, if all you want to do is read mail. Thais are in love with chat and email and are constantly in touch with people from all around the world. So you're never far from an Internet shop. However, finding one that will let you plug your laptop in and start pulling down through CVS is a different story. I use the same place now when I'm in Bangkok, since they know me. Actually, I'll be installing Linux on one of their computers for them when I go back in a few days.

BV: Alright, back to Wine questions. You've submitted lots of patches for the Shell Lightweight API DLL, shlwapi. What is this DLL responsible for in Windows?

Jon: Basically it's a utility dll. A whole bunch of little functions were written to smooth over the differences between the various flavours of Windows that Internet Explorer ran on back when it was a standalone application. That way the developers of the application can prevent their code getting bogged down with lots of special cases every time they make Windows API calls.

Of the functions in this category, most relate to providing unicode functionality. Very little of the code is Explorer specific, it's just that Explorer makes heavy use of it because originally it was part of the Explorer application.

BV: How much of the DLL is undocumented? Do you have any idea how complete Wine's implementation is?

Jon: About half of it is undocumented, which is irritating considering it is supposed to be an 'essential operating system component'. With the patches I just sent, I would say Wine's version is now about 75-80% complete. However the last 20% always requires 80% of the effort :-)

BV: Are there any significant missing pieces? Or is it just a matter of fleshing out the existing work?

Jon: Implementing IQueryAssociations is one that stands out, as it's semi-documented, the framework is in place, but there's no code at all. However, the whole dll has to be done eventually, and until you investigate what some of these calls do it's hard to know if they are related to anything else at all. So it's just chipping through the stub functions at present.

BV: One recent patch enabled Wine's shlwapi to build and be used natively under Windows. What use could developers get out of that?

Jon: The idea of building native versions of Wine's dlls is appealing because it allows you to look 'under the hood' of what a dll is doing. You could print out all of the arguments to a function, in much more detail than something like today's relay/snoop tracing can. This can help understand what's happening in a live Windows system. Also it means we can create redistributable versions of native dlls, potentially usable by (for example) ReactOS or similar projects. Finally though, exposing your code to different compilers is a great way to show up bugs and assumptions that may not be true on all platforms.

BV: Any idea how many of Wine's DLLs can be used in Windows?

Jon: Based on my first stab at getting them to build, 1: shlwapi ;-)

The changes required to the build tools will require a few iterations of arguing^H^H^H^H^H^H discussion before we have something that works seamlessly. Some of this is just a matter of clarifying how it should be done, then there's the mechanics of making it work in a style that Alexandre will accept.

In theory, many of Wine's dlls should at least partially work under Windows. setupx comes to mind as it's a dll I've wanted to hack on for a while now.

BV: One topic that comes up quite a bit is integrating some kind of browser into Wine. Do you think that's necessary?

Jon: I followed the discussion, and I think it will need to be done, eventually. It's a question of how best to take advantage of all the work that other free projects have been doing in this area, and to integrate it into Wine. But I don't intend to be involved in that!

BV: What would you like to see Wine do that it can't right now?

Jon: I'd like to see it integrate into the user's environment seamlessly, to be transparent. I think that's the only way people will ever migrate from Windows, essentially when they don't really see the difference, and everything 'just works'. When I finally get my tree synced up I may try to do some work in this area.

Other than that I would like to see Winelib used more, since Linux is such a great development platform (the development tools, and stability were the main reasons for me to abandon Windows).

BV: It seems like CodeWeavers has done some interesting work in usability and integrating with different distros. Should it be up to Wine to integrate with the desktop, or is that up to the individual distributions?

Jon: It's clear (and very beneficial for Wine) that CodeWeavers considers this important.

I think it's Wine's job, rather than the distributors. Obviously we can't follow all the desktops, but integration with KDE and Gnome should be a goal for the project.

BV: Do you have any particular ideas about what Wine should be integrating with that it isn't? Is Wine too much of a moving target to work on that right now?

Jon: Perhaps Wine changes a little radically at the moment, but after 1.0 the foundations should be there for some really cool work. Things like using rendering GUI elements in the style of the desktop (this would fit naturally on top of a uxtheme.dll implementation). Also things like integrating with the desktop's print system, configuration and setup, etc are important.

BV: Thanks for the interview!