193 lines
4.3 KiB
ReStructuredText
193 lines
4.3 KiB
ReStructuredText
===========================
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Including uAPI header files
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===========================
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Sometimes, it is useful to include header files and C example codes in
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order to describe the userspace API and to generate cross-references
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between the code and the documentation. Adding cross-references for
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userspace API files has an additional vantage: Sphinx will generate warnings
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if a symbol is not found at the documentation. That helps to keep the
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uAPI documentation in sync with the Kernel changes.
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The :ref:`parse_headers.pl <parse_headers>` provide a way to generate such
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cross-references. It has to be called via Makefile, while building the
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documentation. Please see ``Documentation/userspace-api/media/Makefile`` for an example
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about how to use it inside the Kernel tree.
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.. _parse_headers:
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parse_headers.pl
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^^^^^^^^^^^^^^^^
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NAME
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****
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parse_headers.pl - parse a C file, in order to identify functions, structs,
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enums and defines and create cross-references to a Sphinx book.
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SYNOPSIS
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********
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\ **parse_headers.pl**\ [<options>] <C_FILE> <OUT_FILE> [<EXCEPTIONS_FILE>]
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Where <options> can be: --debug, --help or --usage.
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OPTIONS
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*******
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\ **--debug**\
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Put the script in verbose mode, useful for debugging.
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\ **--usage**\
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Prints a brief help message and exits.
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\ **--help**\
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Prints a more detailed help message and exits.
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DESCRIPTION
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***********
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Convert a C header or source file (C_FILE), into a ReStructured Text
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included via ..parsed-literal block with cross-references for the
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documentation files that describe the API. It accepts an optional
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EXCEPTIONS_FILE with describes what elements will be either ignored or
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be pointed to a non-default reference.
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The output is written at the (OUT_FILE).
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It is capable of identifying defines, functions, structs, typedefs,
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enums and enum symbols and create cross-references for all of them.
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It is also capable of distinguish #define used for specifying a Linux
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ioctl.
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The EXCEPTIONS_FILE contain two types of statements: \ **ignore**\ or \ **replace**\ .
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The syntax for the ignore tag is:
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ignore \ **type**\ \ **name**\
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The \ **ignore**\ means that it won't generate cross references for a
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\ **name**\ symbol of type \ **type**\ .
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The syntax for the replace tag is:
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replace \ **type**\ \ **name**\ \ **new_value**\
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The \ **replace**\ means that it will generate cross references for a
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\ **name**\ symbol of type \ **type**\ , but, instead of using the default
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replacement rule, it will use \ **new_value**\ .
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For both statements, \ **type**\ can be either one of the following:
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\ **ioctl**\
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The ignore or replace statement will apply to ioctl definitions like:
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#define VIDIOC_DBG_S_REGISTER _IOW('V', 79, struct v4l2_dbg_register)
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\ **define**\
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The ignore or replace statement will apply to any other #define found
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at C_FILE.
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\ **typedef**\
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The ignore or replace statement will apply to typedef statements at C_FILE.
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\ **struct**\
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The ignore or replace statement will apply to the name of struct statements
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at C_FILE.
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\ **enum**\
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The ignore or replace statement will apply to the name of enum statements
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at C_FILE.
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\ **symbol**\
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The ignore or replace statement will apply to the name of enum value
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at C_FILE.
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For replace statements, \ **new_value**\ will automatically use :c:type:
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references for \ **typedef**\ , \ **enum**\ and \ **struct**\ types. It will use :ref:
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for \ **ioctl**\ , \ **define**\ and \ **symbol**\ types. The type of reference can
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also be explicitly defined at the replace statement.
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EXAMPLES
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********
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ignore define _VIDEODEV2_H
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Ignore a #define _VIDEODEV2_H at the C_FILE.
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ignore symbol PRIVATE
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On a struct like:
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enum foo { BAR1, BAR2, PRIVATE };
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It won't generate cross-references for \ **PRIVATE**\ .
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replace symbol BAR1 :c:type:\`foo\`
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replace symbol BAR2 :c:type:\`foo\`
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On a struct like:
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enum foo { BAR1, BAR2, PRIVATE };
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It will make the BAR1 and BAR2 enum symbols to cross reference the foo
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symbol at the C domain.
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BUGS
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****
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Report bugs to Mauro Carvalho Chehab <mchehab@kernel.org>
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COPYRIGHT
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*********
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Copyright (c) 2016 by Mauro Carvalho Chehab <mchehab+samsung@kernel.org>.
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License GPLv2: GNU GPL version 2 <https://gnu.org/licenses/gpl.html>.
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This is free software: you are free to change and redistribute it.
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There is NO WARRANTY, to the extent permitted by law.
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