diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/kernel-doc-nano-HOWTO.txt |
Linux-2.6.12-rc2v2.6.12-rc2
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!
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1 | kernel-doc nano-HOWTO | ||
2 | ===================== | ||
3 | |||
4 | Many places in the source tree have extractable documentation in the | ||
5 | form of block comments above functions. The components of this system | ||
6 | are: | ||
7 | |||
8 | - scripts/kernel-doc | ||
9 | |||
10 | This is a perl script that hunts for the block comments and can mark | ||
11 | them up directly into DocBook, man, text, and HTML. (No, not | ||
12 | texinfo.) | ||
13 | |||
14 | - Documentation/DocBook/*.tmpl | ||
15 | |||
16 | These are SGML template files, which are normal SGML files with | ||
17 | special place-holders for where the extracted documentation should | ||
18 | go. | ||
19 | |||
20 | - scripts/docproc.c | ||
21 | |||
22 | This is a program for converting SGML template files into SGML | ||
23 | files. When a file is referenced it is searched for symbols | ||
24 | exported (EXPORT_SYMBOL), to be able to distinguish between internal | ||
25 | and external functions. | ||
26 | It invokes kernel-doc, giving it the list of functions that | ||
27 | are to be documented. | ||
28 | Additionally it is used to scan the SGML template files to locate | ||
29 | all the files referenced herein. This is used to generate dependency | ||
30 | information as used by make. | ||
31 | |||
32 | - Makefile | ||
33 | |||
34 | The targets 'sgmldocs', 'psdocs', 'pdfdocs', and 'htmldocs' are used | ||
35 | to build DocBook files, PostScript files, PDF files, and html files | ||
36 | in Documentation/DocBook. | ||
37 | |||
38 | - Documentation/DocBook/Makefile | ||
39 | |||
40 | This is where C files are associated with SGML templates. | ||
41 | |||
42 | |||
43 | How to extract the documentation | ||
44 | -------------------------------- | ||
45 | |||
46 | If you just want to read the ready-made books on the various | ||
47 | subsystems (see Documentation/DocBook/*.tmpl), just type 'make | ||
48 | psdocs', or 'make pdfdocs', or 'make htmldocs', depending on your | ||
49 | preference. If you would rather read a different format, you can type | ||
50 | 'make sgmldocs' and then use DocBook tools to convert | ||
51 | Documentation/DocBook/*.sgml to a format of your choice (for example, | ||
52 | 'db2html ...' if 'make htmldocs' was not defined). | ||
53 | |||
54 | If you want to see man pages instead, you can do this: | ||
55 | |||
56 | $ cd linux | ||
57 | $ scripts/kernel-doc -man $(find -name '*.c') | split-man.pl /tmp/man | ||
58 | $ scripts/kernel-doc -man $(find -name '*.h') | split-man.pl /tmp/man | ||
59 | |||
60 | Here is split-man.pl: | ||
61 | |||
62 | --> | ||
63 | #!/usr/bin/perl | ||
64 | |||
65 | if ($#ARGV < 0) { | ||
66 | die "where do I put the results?\n"; | ||
67 | } | ||
68 | |||
69 | mkdir $ARGV[0],0777; | ||
70 | $state = 0; | ||
71 | while (<STDIN>) { | ||
72 | if (/^\.TH \"[^\"]*\" 4 \"([^\"]*)\"/) { | ||
73 | if ($state == 1) { close OUT } | ||
74 | $state = 1; | ||
75 | $fn = "$ARGV[0]/$1.4"; | ||
76 | print STDERR "Creating $fn\n"; | ||
77 | open OUT, ">$fn" or die "can't open $fn: $!\n"; | ||
78 | print OUT $_; | ||
79 | } elsif ($state != 0) { | ||
80 | print OUT $_; | ||
81 | } | ||
82 | } | ||
83 | |||
84 | close OUT; | ||
85 | <-- | ||
86 | |||
87 | If you just want to view the documentation for one function in one | ||
88 | file, you can do this: | ||
89 | |||
90 | $ scripts/kernel-doc -man -function fn file | nroff -man | less | ||
91 | |||
92 | or this: | ||
93 | |||
94 | $ scripts/kernel-doc -text -function fn file | ||
95 | |||
96 | |||
97 | How to add extractable documentation to your source files | ||
98 | --------------------------------------------------------- | ||
99 | |||
100 | The format of the block comment is like this: | ||
101 | |||
102 | /** | ||
103 | * function_name(:)? (- short description)? | ||
104 | (* @parameterx: (description of parameter x)?)* | ||
105 | (* a blank line)? | ||
106 | * (Description:)? (Description of function)? | ||
107 | * (section header: (section description)? )* | ||
108 | (*)?*/ | ||
109 | |||
110 | The short function description cannot be multiline, but the other | ||
111 | descriptions can be (and they can contain blank lines). Avoid putting a | ||
112 | spurious blank line after the function name, or else the description will | ||
113 | be repeated! | ||
114 | |||
115 | All descriptive text is further processed, scanning for the following special | ||
116 | patterns, which are highlighted appropriately. | ||
117 | |||
118 | 'funcname()' - function | ||
119 | '$ENVVAR' - environment variable | ||
120 | '&struct_name' - name of a structure (up to two words including 'struct') | ||
121 | '@parameter' - name of a parameter | ||
122 | '%CONST' - name of a constant. | ||
123 | |||
124 | Take a look around the source tree for examples. | ||
125 | |||
126 | |||
127 | How to make new SGML template files | ||
128 | ----------------------------------- | ||
129 | |||
130 | SGML template files (*.tmpl) are like normal SGML files, except that | ||
131 | they can contain escape sequences where extracted documentation should | ||
132 | be inserted. | ||
133 | |||
134 | !E<filename> is replaced by the documentation, in <filename>, for | ||
135 | functions that are exported using EXPORT_SYMBOL: the function list is | ||
136 | collected from files listed in Documentation/DocBook/Makefile. | ||
137 | |||
138 | !I<filename> is replaced by the documentation for functions that are | ||
139 | _not_ exported using EXPORT_SYMBOL. | ||
140 | |||
141 | !D<filename> is used to name additional files to search for functions | ||
142 | exported using EXPORT_SYMBOL. | ||
143 | |||
144 | !F<filename> <function [functions...]> is replaced by the | ||
145 | documentation, in <filename>, for the functions listed. | ||
146 | |||
147 | |||
148 | Tim. | ||
149 | */ <twaugh@redhat.com> | ||
150 | |||