160 lines
7.6 KiB
Plaintext
160 lines
7.6 KiB
Plaintext
@chapter What is it?
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The Cygwin tools are ports of the popular GNU development tools for
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Microsoft Windows. They run thanks to the Cygwin library which
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provides the UNIX system calls and environment these programs expect.
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With these tools installed, it is possible to write Win32 console or
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GUI applications that make use of the standard Microsoft Win32 API
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and/or the Cygwin API. As a result, it is possible to easily
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port many significant Unix programs without the need
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for extensive changes to the source code. This includes configuring
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and building most of the available GNU software (including the packages
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included with the Cygwin development tools themselves). Even if
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the development tools are of little to no use to you, you may have
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interest in the many standard Unix utilities provided with the package.
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They can be used both from the bash shell (provided) or from the
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standard Windows command shell.
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@section What versions of Windows are supported?
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Wait a minute... Cygwin is only @emph{supported} if you are paying for
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it, such as through a support contract with Red Hat. For information
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about getting a Red Hat support contract, see
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@file{http://www.redhat.com/software/tools/cygwin/}.
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That said, Cygwin can be expected to run on all modern 32 bit versions of
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Windows, except Windows CE. This includes Windows 95/98/ME/NT/2000/XP.
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Keep in mind that Cygwin can only do as much as the underlying OS
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supports. Because of this, Cygwin will behave differently, and
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exhibit different limitations, on the various versions of Windows.
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@section Where can I get it?
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The home page for the Cygwin project is @file{http://cygwin.com/}.
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There you should find everything you need for Cygwin, including links
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for download and setup, a current list of mirror sites, a User's
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Guide, an API Reference, mailing lists and archives, and additional
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ported software.
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You can find documentation for the individual GNU tools at
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@file{http://www.fsf.org/manual/}. (You should read GNU manuals from a
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local mirror. Check @file{http://www.fsf.org/server/list-mirrors.html}
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for a list of them.)
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@section Is it free software?
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Yes. Parts are GNU software (gcc, gas, ld, etc...), parts are covered
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by the standard X11 license, some of it is public domain, some of
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it was written by Cygnus and placed under the GPL. None of it is
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shareware. You don't have to pay anyone to use it but you should be
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sure to read the copyright section of the FAQ more more information on
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how the GNU General Public License may affect your use of these tools.
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In particular, if you intend to port a proprietary (non-GPL'd)
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application using Cygwin, you will need the proprietary-use license
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for the Cygwin library. This is available for purchase; please visit
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@file{http://www.redhat.com/software/tools/cygwin/} for more information.
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All other questions should be sent to the project
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mailing list cygwin@@cygwin.com.
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Note that when we say "free" we mean freedom, not price. The goal of
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such freedom is that the people who use a given piece of software
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should be able to change it to fit their needs, learn from it, share
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it with their friends, etc. The Cygwin license allows you those
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freedoms, so it is free software.
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The Cygwin 1.0 product was a "commercial" distribution of cygwin. As
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such, it included such non-software things as printed manuals,
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support, and aggregation of useful utilities. There was nothing
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(software-wise) in there that you couldn't get off the net already, if
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you took the time to find and download everything (and usually, build
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it yourself), although the @emph{versions} available for download may
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have been different than those distributed with the commercial
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product. We tested it all to make sure it worked together, and
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packaged it in a convenient form. We considered such testing and
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packaging to be a valuable service and thus charged a fee for it.
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Plus, it provided income for the Cygwin project so we could continue
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working on it. However, Red Hat is no longer offering Cygwin 1.0 on
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CD, and there are no plans to do so again. The latest news about this
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can be found at @file{http://cygwin.com/cygwin-cd.html}.
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@section Recent history of the project: What version @emph{is} this, anyway?
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Starting on April 17, 2000, the Cygwin team changed the procedure for
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doing net releases.
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Previously, net releases entailed downloading one or two large files
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(called something like @code{FULL.EXE} or @code{USER.EXE}). These files
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unpacked a "Cygwin Distribution" to a static (and arcane) directory
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structure. This distribution contained lots of .exe, .a, .h, and other
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files.
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These distributions were named after the version of the Cygwin DLL which
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they contained. The last version released with this method was Cygwin
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B20.1.
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This distribution method has the advantage that everything was "all in
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one place". You could copy the huge FULL.EXE file around and know that
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you were getting the complete "Cygwin Distribution".
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The method had several disadvantages, however. 1) it was huge, 2) it
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was hard to download in one error-free piece, and 3) it was hard to
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update.
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Why was it hard to update? Because any change to any package in
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FULL.EXE meant re-generating all of FULL.EXE. This process was not easy
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to automate since FULL.EXE was an InstallShield executable. As a
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result, until recently, Cygwin development was relatively static.
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To rectify these problems, the Cygwin team decided, early in January
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2000, to break up the packages in the release and make a small program
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(@code{setup.exe}) available to use in downloading packages. After much
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development and internal discussion on the cygwin-developers mailing
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list, the new, improved version of a Cygwin release was made available
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on April 17, 2000.
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This new release also had a new version of the Cygwin DLL -- 1.1.0.
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Most of the other packages were updated and some packages from the
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Cygwin CD were included. Meanwhile, the Cygwin DLL continues to be
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updated, and since release 1.3.1, is more generically referred to as
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"1.3.x".
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Users obtain this package by first downloading a version of
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Cygwin Setup. This program started as a simple command line tool,
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has metamorphosed into a GUI, and is in the process of continual
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improvement. However, its purpose is simple -- it is designed to
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install packages from the cygwin web site at @file{http://cygwin.com/}.
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In effect, it is a smaller, more intelligent replacement for FULL.EXE.
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It does not require the downloading a huge executable but rather
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downloads individual small packages.
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Does this mean that the new net release of the Cygwin package is 1.3.x?
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No. We no longer label the releases with the Cygwin version number.
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Each package in the cygwin release has its own version now.
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Does this mean that Cygwin 1.3.x is newer than B20.1? Yes! The cygwin
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1.3.x versions all represent continual improvement in the Cygwin DLL.
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Although the 1.3.x code is still considered "beta quality", the Cygwin
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team felt comfortable enough with the cygwin technology to bump the
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version number to "1".
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The other packages in the latest directory are also continually
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improving, thanks to the efforts of net volunteers who maintain the
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cygwin binary ports. Each package has its own version numbers and its
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own release process.
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So, how do you get the most up-to-date version of cygwin? Easy. Just
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download the Cygwin Setup program from
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@file{http://cygwin.com/setup.exe}. This program will handle the task
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of updating the packages on your system to the latest version. The
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Cygwin team frequently updates and adds new packages to the sourceware
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web site. The Cygwin Setup program is the easiest way to determine what
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you need on your system.
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For some "ancient" history of the project (rather, just woefully out of
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date), visit the Project History page at
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@file{http://cygwin.com/history.html}.
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