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396 lines
13 KiB
Plaintext
396 lines
13 KiB
Plaintext
<chapter id="porting">
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<title>Porting Wine to new Platforms</title>
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<para>Porting Wine to different (UNIX-based) operating systems...</para>
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<sect1 id="wine-porting">
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<title>Porting</title>
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<para>
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written by ???
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</para>
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<para>
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(Extracted from <filename>wine/documentation/how-to-port</filename>)
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</para>
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<sect2>
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<title>What is this?</title>
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<para>
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This note is a short description of:
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</para>
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<itemizedlist>
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<listitem>
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<para>How to port Wine to your favourite operating system</para>
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</listitem>
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<listitem>
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<para>Why you probably shouldn't use <symbol>#ifdef MyOS</symbol></para>
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</listitem>
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<listitem>
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<para>What to do instead.</para>
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</listitem>
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</itemizedlist>
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<para>
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This document does not say a thing about how to port Wine to
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non-386 operating systems, though. You would need a CPU
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emulator. Let's get Wine into a better shape on 386 first,
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OK?
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</para>
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</sect2>
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<sect2>
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<title>Why <symbol>#ifdef MyOS</symbol> is probably a mistake.</title>
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<para>
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Operating systems change. Maybe yours doesn't have the
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<filename>foo.h</filename> header, but maybe a future
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version will have it. If you want to <symbol>#include
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<foo.h></symbol>, it doesn't matter what operating
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system you are using; it only matters whether
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<filename>foo.h</filename> is there.
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</para>
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<para>
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Furthermore, operating systems change names or "fork" into
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several ones. An <symbol>#ifdef MyOs</symbol> will break
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over time.
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</para>
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<para>
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If you use the feature of <command>autoconf</command> -- the
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Gnu auto-configuration utility -- wisely, you will help
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future porters automatically because your changes will test
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for <emphasis>features</emphasis>, not names of operating
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systems. A feature can be many things:
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</para>
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<itemizedlist>
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<listitem>
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<para>existance of a header file</para>
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</listitem>
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<listitem>
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<para>existance of a library function</para>
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</listitem>
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<listitem>
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<para>existance of libraries</para>
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</listitem>
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<listitem>
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<para>bugs in header files, library functions, the compiler, ...</para>
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</listitem>
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<listitem>
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<para>(you name it)</para>
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</listitem>
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</itemizedlist>
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<para>
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You will need Gnu Autoconf, which you can get from your
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friendly Gnu mirror. This program takes Wine's
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<filename>configure.in</filename> file and produces a
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<filename>configure</filename> shell script that users use
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to configure Wine to their system.
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</para>
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<para>
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There <emphasis>are</emphasis> exceptions to the "avoid
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<symbol>#ifdef MyOS</symbol>" rule. Wine, for example, needs
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the internals of the signal stack -- that cannot easily be
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described in terms of features.
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</para>
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<para>
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Let's now turn to specific porting problems and how to solve
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them.
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</para>
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</sect2>
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<sect2>
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<title>MyOS doesn't have the <filename>foo.h</filename> header!</title>
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<para>
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This first step is to make <command>autoconf</command> check
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for this header. In <filename>configure.in</filename> you
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add a segment like this in the section that checks for
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header files (search for "header files"):
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</para>
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<programlisting>
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AC_CHECK_HEADER(foo.h, AC_DEFINE(HAVE_FOO_H))
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</programlisting>
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<para>
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If your operating system supports a header file with the
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same contents but a different name, say
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<filename>bar.h</filename>, add a check for that also.
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</para>
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<para>
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Now you can change
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</para>
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<programlisting>
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#include <foo.h>
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</programlisting>
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<para>
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to
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</para>
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<programlisting>
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#ifdef HAVE_FOO_H
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#include <foo.h>
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#elif defined (HAVE_BAR_H)
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#include <bar.h>
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#endif
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</programlisting>
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<para>
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If your system doesn't have a corresponding header file even
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though it has the library functions being used, you might
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have to add an <symbol>#else</symbol> section to the
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conditional. Avoid this if you can.
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</para>
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<para>
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You will also need to add <symbol>#undef HAVE_FOO_H</symbol>
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(etc.) to <filename>include/config.h.in</filename>
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</para>
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<para>
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Finish up with <command>make configure</command> and
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<command>./configure</command>.
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</para>
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</sect2>
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<sect2>
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<title>MyOS doesn't have the <function>bar</function> function!</title>
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<para>
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A typical example of this is the
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<function>memmove</function> function. To solve this
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problem you would add <function>memmove</function> to the
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list of functions that <command>autoconf</command> checks
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for. In <filename>configure.in</filename> you search for
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<function>AC_CHECK_FUNCS</function> and add
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<function>memmove</function>. (You will notice that someone
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already did this for this particular function.)
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</para>
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<para>
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Secondly, you will also need to add <symbol>#undef
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HAVE_BAR</symbol> to
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<filename>include/config.h.in</filename>
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</para>
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<para>
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The next step depends on the nature of the missing function.
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</para>
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<variablelist>
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<varlistentry>
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<term>Case 1:</term>
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<listitem>
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<para>
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It's easy to write a complete implementation of the
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function. (<function>memmove</function> belongs to
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this case.)
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</para>
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<para>
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You add your implementation in
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<filename>misc/port.c</filename> surrounded by
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<symbol>#ifndef HAVE_MEMMOVE</symbol> and
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<symbol>#endif</symbol>.
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</para>
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<para>
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You might have to add a prototype for your function.
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If so, <filename>include/miscemu.h</filename> might be the place. Don't
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forget to protect that definition by <symbol>#ifndef
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HAVE_MEMMOVE</symbol> and <symbol>#endif</symbol> also!
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>Case 2:</term>
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<listitem>
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<para>
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A general implementation is hard, but Wine is only
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using a special case.
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</para>
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<para>
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An example is the various <function>wait</function>
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calls used in <function>SIGNAL_child</function> from
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<filename>loader/signal.c</filename>. Here we have a
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multi-branch case on features:
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</para>
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<programlisting>
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#ifdef HAVE_THIS
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...
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#elif defined (HAVE_THAT)
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...
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#elif defined (HAVE_SOMETHING_ELSE)
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...
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#endif
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</programlisting>
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<para>
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Note that this is very different from testing on
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operating systems. If a new version of your operating
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systems comes out and adds a new function, this code
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will magically start using it.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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Finish up with <command>make configure</command> and
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<command>./configure</command>.
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</para>
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</sect2>
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</sect1>
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<sect1 id="os2-wine">
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<title>Running & Compiling WINE in OS/2</title>
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<para>
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Written by &name-robert-pouliot; <email>&email-robert-pouliot;</email>,
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January 9, 1997
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</para>
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<para>
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(Extracted from <filename>wine/documentation/wine_os2</filename>)
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</para>
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<para>
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If you want to help the port of WINE to OS/2, send me a
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message at <email>krynos@clic.net</email> I currently don't
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want beta testers. It must work before we can test it.
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</para>
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<para>
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Here is what you need to (try to) compile Wine for OS/2:
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</para>
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<itemizedlist>
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<listitem>
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<para>EMX 0.9c (fix 2)</para>
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</listitem>
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<listitem>
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<para>XFree86 3.2 OS/2 (with development libraries)</para>
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</listitem>
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<listitem>
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<para>
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<command>bash</command>, gnu <command>make</command>,
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<command>grep</command>, <command>tar</command>,
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<command>bison</command>, <command>flex</command>
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</para>
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</listitem>
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<listitem>
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<para><command>sed</command> (a working copy of)</para>
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</listitem>
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<listitem>
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<para>xpm</para>
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</listitem>
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<listitem>
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<para><command>diff</command> and <command>patch</command>
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are recommended</para>
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</listitem>
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<listitem>
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<para>Lots of disk space (about 40-50 megs after EMX and XFree installed)</para>
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</listitem>
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</itemizedlist>
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<para>
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To compile:
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</para>
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<screen>
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<prompt>$ </prompt><userinput>sh</userinput>
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<prompt>$ </prompt><userinput>tools/make_os2.sh</userinput>
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<prompt>$ </prompt><userinput>make depend</userinput>
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<prompt>$ </prompt><userinput>make</userinput>
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<prompt>$ </prompt><userinput>emxbind wine</userinput>
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</screen>
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<para>
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Currently:
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</para>
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<itemizedlist>
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<listitem>
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<para><command>configure</command> and <command>make depend</command> work...</para>
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</listitem>
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<listitem>
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<para><command>make</command> compiles (with a modified
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Linux <filename>mman.h</filename>), but doesn't
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link.</para>
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</listitem>
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<listitem>
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<para>signal handling is horrible... (if any)</para>
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</listitem>
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<listitem>
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<para>EMX doesn't support <function>mmap</function> (and
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related), SysV IPC and <function>stafs()</function></para>
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</listitem>
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<listitem>
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<para>
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XFree86/OS2 3.2 doesn't support
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<function>XShmQueryExtension()</function> and
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<function>XShmPixmapFormat()</function> due to the same
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lack in EMX...
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</para>
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</listitem>
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</itemizedlist>
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<para>
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What needs to be redone:
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</para>
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<itemizedlist>
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<listitem>
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<para>LDT (using <function>DosAllocSeg</function> in
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<filename>memory/ldt.c</filename>) *</para>
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</listitem>
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<listitem>
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<para>Implement <function>mmap()</function> and SysV IPC in EMX *</para>
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</listitem>
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<listitem>
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<para>File functions, </para>
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</listitem>
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<listitem>
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<para>I/O access (do it!),</para>
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</listitem>
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<listitem>
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<para>Communication (modem),</para>
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</listitem>
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<listitem>
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<para>Interrupt (if int unknown, call current RealMode one...), </para>
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</listitem>
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<listitem>
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<para>
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Verify that everything is thread safe (how does Win95/NT handle multi-thread?),
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</para>
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</listitem>
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<listitem>
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<para>
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Move X functions in some files (and make a wrapper, to use PM instead latter),
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</para>
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</listitem>
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<listitem>
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<para>Return right CPU type, </para>
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</listitem>
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<listitem>
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<para>Make winsock work</para>
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</listitem>
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</itemizedlist>
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<para>
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The good things:
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</para>
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<itemizedlist>
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<listitem>
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<para>OS/2 have DOS interrupts</para>
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</listitem>
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<listitem>
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<para>OS/2 have I/O port access</para>
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</listitem>
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<listitem>
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<para>OS/2 have multi-thread</para>
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</listitem>
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<listitem>
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<para>Merlin have Open32 (to be used later...)</para>
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</listitem>
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</itemizedlist>
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</sect1>
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</chapter>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-parent-document:("wine-doc.sgml" "set" "book" "part" "chapter" "")
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End:
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-->
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