As mentioned before, Wine is a single process which translates Windows calls, including undocumented calls that applications need (and a few DOS int21 calls as well) to X and Unix calls, respectively. It is also responsible for properly loading Windows applications. Wine reads the executable file, and correctly loads the code, data, and resources into memory.
Wine is a single process which uses only one non-standard system call, which is required to be able to run 16-bit code instead of 32-bit code. Therefore, it is relatively simple to port Wine to operating systems which conform to POSIX (more or less), have X, and for which the source is free, or which provide an appropriate alternate non-standard system call for setting up the LDT so that 16-bit code can run. Wine was originally developed for Linux, but the port to FreeBSD and NetBSD took less than a week.
The most basic window-handling functions in Wine are written as an interface to the appropriate Xlib functions for manipulating X windows. However, wherever possible, other internal functions in Wine call the basic window-handling functions in Wine instead of Xlib. This has several benefits: it makes Wine more modular, it makes the basic window-handling functions be better tested, and it makes it less necessary for every Wine developer to have X programming expertise.
Wine can be run like any other X program: you can run it from the command line:
% wine sol
or you can put it in a menu, or launch it from a file manager. When launched, programs run and act as if they were running under Windows. By default, applications come up in a special kind of window that looks very much like those provided by Windows instead of looking like other X windows. It looks as if a normal Windows window popped up in the middle of all your X windows, because your window manager doesn't put a standard “frame” on the window. Unfortunately, those windows do not interact well with virtual window managers like fvwm (they don't go away when you switch to another virtual screen), so there is an option to bring up an X window that contains the application window, and this is well-behaved with virtual window managers.
Wine is still in ALPHA testing. It only runs a few applications (other than the test applications that come with it) at this point, although more are being added rapidly to the list. At some point, when Wine supports several major applications, it will be released as BETA software for anyone to play with. However, the BETA release will most likely be missing several features. DDE and OLE are not likely to be supported in the BETA release, and because X has no standard printing mechanism, printing will probably also be unsupported.
Development will not stop with the BETA release. If anything, it will speed up as more programmers become familiar with the project. New BETA releases will be released periodically as Wine progresses.
To continue to develop Wine, we need your help. All the work on the project is currently being done by volunteers with Internet access, so anyone with Internet access may join the project. If you are interested, but are not skilled at Windows programming, start by reading the FAQ, available from tsx-11.mit.edu or aris.com in /pub/linux/ALPHA/Wine/Wine.FAQ.
There are several projects that can be done by newcomers to the project who are not yet skilled in Windows programming, and there are also reading recommendations for learning the Windows programming skills you need to be of more help to the project.
If you have more money than time, please consider a donation to the Wine project. Donations will be used to hire programmers to accelerate the development. If you are interested in making a donation of any size, please contact firstname.lastname@example.org.
Bob Amstadt graduated from Rose-Hulman Institute of Technology in 1986 with a BS in both Electrical Engineering and Computer Science. For the past five years he has worked as an independent engineering consultant specializing in embedded control and communications systems. His first exposure to Linux was in December 1992 when he installed it on his e-mail server. He began work on Wine as a result of discussions on comp.os.linux in May and June of 1993.
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