1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
150 lines
4.3 KiB
Text
150 lines
4.3 KiB
Text
kernel-doc nano-HOWTO
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=====================
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Many places in the source tree have extractable documentation in the
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form of block comments above functions. The components of this system
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are:
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- scripts/kernel-doc
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This is a perl script that hunts for the block comments and can mark
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them up directly into DocBook, man, text, and HTML. (No, not
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texinfo.)
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- Documentation/DocBook/*.tmpl
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These are SGML template files, which are normal SGML files with
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special place-holders for where the extracted documentation should
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go.
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- scripts/docproc.c
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This is a program for converting SGML template files into SGML
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files. When a file is referenced it is searched for symbols
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exported (EXPORT_SYMBOL), to be able to distinguish between internal
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and external functions.
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It invokes kernel-doc, giving it the list of functions that
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are to be documented.
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Additionally it is used to scan the SGML template files to locate
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all the files referenced herein. This is used to generate dependency
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information as used by make.
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- Makefile
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The targets 'sgmldocs', 'psdocs', 'pdfdocs', and 'htmldocs' are used
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to build DocBook files, PostScript files, PDF files, and html files
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in Documentation/DocBook.
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- Documentation/DocBook/Makefile
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This is where C files are associated with SGML templates.
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How to extract the documentation
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--------------------------------
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If you just want to read the ready-made books on the various
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subsystems (see Documentation/DocBook/*.tmpl), just type 'make
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psdocs', or 'make pdfdocs', or 'make htmldocs', depending on your
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preference. If you would rather read a different format, you can type
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'make sgmldocs' and then use DocBook tools to convert
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Documentation/DocBook/*.sgml to a format of your choice (for example,
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'db2html ...' if 'make htmldocs' was not defined).
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If you want to see man pages instead, you can do this:
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$ cd linux
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$ scripts/kernel-doc -man $(find -name '*.c') | split-man.pl /tmp/man
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$ scripts/kernel-doc -man $(find -name '*.h') | split-man.pl /tmp/man
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Here is split-man.pl:
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-->
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#!/usr/bin/perl
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if ($#ARGV < 0) {
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die "where do I put the results?\n";
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}
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mkdir $ARGV[0],0777;
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$state = 0;
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while (<STDIN>) {
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if (/^\.TH \"[^\"]*\" 4 \"([^\"]*)\"/) {
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if ($state == 1) { close OUT }
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$state = 1;
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$fn = "$ARGV[0]/$1.4";
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print STDERR "Creating $fn\n";
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open OUT, ">$fn" or die "can't open $fn: $!\n";
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print OUT $_;
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} elsif ($state != 0) {
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print OUT $_;
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}
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}
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close OUT;
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<--
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If you just want to view the documentation for one function in one
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file, you can do this:
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$ scripts/kernel-doc -man -function fn file | nroff -man | less
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or this:
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$ scripts/kernel-doc -text -function fn file
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How to add extractable documentation to your source files
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---------------------------------------------------------
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The format of the block comment is like this:
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/**
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* function_name(:)? (- short description)?
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(* @parameterx: (description of parameter x)?)*
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(* a blank line)?
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* (Description:)? (Description of function)?
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* (section header: (section description)? )*
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(*)?*/
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The short function description cannot be multiline, but the other
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descriptions can be (and they can contain blank lines). Avoid putting a
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spurious blank line after the function name, or else the description will
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be repeated!
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All descriptive text is further processed, scanning for the following special
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patterns, which are highlighted appropriately.
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'funcname()' - function
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'$ENVVAR' - environment variable
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'&struct_name' - name of a structure (up to two words including 'struct')
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'@parameter' - name of a parameter
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'%CONST' - name of a constant.
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Take a look around the source tree for examples.
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How to make new SGML template files
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-----------------------------------
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SGML template files (*.tmpl) are like normal SGML files, except that
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they can contain escape sequences where extracted documentation should
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be inserted.
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!E<filename> is replaced by the documentation, in <filename>, for
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functions that are exported using EXPORT_SYMBOL: the function list is
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collected from files listed in Documentation/DocBook/Makefile.
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!I<filename> is replaced by the documentation for functions that are
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_not_ exported using EXPORT_SYMBOL.
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!D<filename> is used to name additional files to search for functions
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exported using EXPORT_SYMBOL.
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!F<filename> <function [functions...]> is replaced by the
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documentation, in <filename>, for the functions listed.
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Tim.
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*/ <twaugh@redhat.com>
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