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The h2xs Converter
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For all libraries there is a corresponding header file that contains the definitions of any constant values, structure definitions, and the prototypes of any functions contained within the library Although the XS system does not handle C structures, you can use the h2xs utility to convert an existing header file into an XS file, suitable for producing the interface The h2xs command reads in the contents of the header file and produces an XS file that consists of all the basic definitions and function-interface components to make the C functions available as an extension in Perl The file produced is very basic and is only suitable for functions that return one of the basic data types You will need to modify the file if you want to do more complex conversions or if you want to return, say, the contents of a structure as a list of return values The modification and production of this information makes up the bulk of this section of the chapter In addition, h2xs produces a module file with all the necessary code required to import the external C function and provide the necessary constants and other values to a Perl script The module file also includes a bare template of some POD (Plain Old Documentation) formatted documentation that you should modify if you plan to distribute the module to other people
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The other major component is a Perl makefile called MakefilePL This contains the absolute minimum of definitions required to ensure that the MakeMaker module produces a makefile suitable for building and installing the extension This takes a lot of the guesswork out of the process of compiling the extension, as you will see It s also the method used in the CPAN modules to automatically extract, build, and install the extension on any destination machine See 2, for more information Finally, h2xs produces a test script and two documentation files The testpl file just calls each of the functions mentioned to make sure they could be loaded Again, this file should be modified to include more complex tests to ensure that the extension can be used properly By default, it s the script used to test the distribution when a make test command is run The Changes file is provided for you to record any modifications, and the MANIFEST file lists the files that make up the core files required for the extension These files are vital components of a typical CPAN module, because they provide additional information to the user about the expected contents of the package they have downloaded The h2xs script is very straightforward to use:
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$ h2xs /usr/include/sys/statvfsh Writing Statvfs/Statvfspm Writing Statvfs/Statvfsxs Writing Statvfs/MakefilePL Writing Statvfs/testpl Writing Statvfs/Changes Writing Statvfs/MANIFEST
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The file name and package name are title case, as per the usual Perl standards; and, depending on the source content, the files are written into a separate subdirectory In theory, the files produced should be ready for compilation and installation If you need to include additional libraries when using the functions, you should append the library names to the command line you supply There are also some options to the h2xs command, but refer to the man page for more information The core of the XS system is the XS file; and, although one is produced by the h2xs system, it is much more likely that you will want to build in some form of customization
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The XS file is the core of the XS system It defines the interface between Perl and the underlying C functions you are providing an interface to Although in some cases the file will be automatically produced by the h2xs utility, it s unlikely that it will perfectly match either the desired results or the interface you have come to expect between callers and functions in the Perl language
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