2000-03-29 16:38:44 +04:00
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<html><head><title>
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Porting Hints
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</title></head><body><h3>
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Porting Hints
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</h3><hr>
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<p>NOTE: The following procedures have been replaced by GNU automake and
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autoconfigure. This page is to be updated in the next release.
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<p>Porting to a new machine or operating system ordinarily requires
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updating the <code>./machines</code> directory and the
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<code>./compilers</code> directories in order to define the build
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environment and autoconfigure means. You will probably have to modify
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the <code>ntp_machines.h</code> file and <code>"l_stdlib.h"</code> files
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as well. The two most famous trouble spots are the I/O code in
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<code>./ntpd/ntp_io.c</code> and the clock adjustment code in
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<code>./ntpd/ntp_unixclock.c</code>.
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<p>These are the rules so that older bsd systems and the POSIX standard
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system can coexist together.
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<ol>
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<li>If you use <code>select</code> then include
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<code>"ntp_select.h"</code>. <code>select</code> is not standard, since
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it is very system dependent as to where it is defined. The logic to
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include the right system dependent include file is in
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<code>"ntp_select.h"</code>.
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<p><li>Always use POSIX definition of strings. Include
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<code>"ntp_string.h"</code> instead of <code><string.h></code>.
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<p><li>Always include <code>"ntp_malloc.h"</code> if you use
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<code>malloc</code>.
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<p><li>Always include <code>"ntp_io.h"</code> instead of
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<code><sys/file.h></code> or <code><fnctl.h></code> to get
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<code>O_*</code> flags.
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<p><li>Always include <code>"ntp_if.h"</code> instead of
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<code><net/if.h></code>.
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<p><li>Always include <code>"ntp_stdlib.h"</code> instead of
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<code><stdlib.h></code>.
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<p><li>Define any special defines needed for a system in
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<code>./include/ntp_machine.h</code> based on system identifier. This
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file is included by the <code>"ntp_types.h"</code> file and should
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always be placed first after the <code><></code> defines.
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<p><li>Define any special library prototypes left over from the system
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library and include files in the <code>"l_stdlib.h"</code> file. This
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file is included by the <code>"ntp_stdlib.h"</code> file and should
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ordinarily be placed last in the includes list.
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<p><li>Don't define a include file by the same name as a system include
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file.
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</ol>
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<p><code>"l_stdlib.h"</code> can contain any extra definitions that are
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needed so that <code>gcc</code> will shut up. They should be controlled
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by a system identifier and there should be a separate section for each
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system. Really this will make it easier to maintain.
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<p>See <code>include/ntp_machines.h</code> for the various compile time
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options.
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<p>When you are satisfied the port works and that other ports are not
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adversely affected, please send <a href="patches.htm">patches</a> for
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the system files you have changed, as well as any documentation that
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should be updated, including the advice herein.
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<p>Good luck.
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2000-04-22 20:46:49 +04:00
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<hr><a href=index.htm>Home</a><address><a
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2000-03-29 16:38:44 +04:00
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href=mailto:mills@udel.edu> David L. Mills <mills@udel.edu></a>
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</address></a></body></html>
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