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my ($total, $used, $free) = fsstat("/"); print ((($total+$used+$free) '' : 'not'),"ok 2\n"); # We should get a number >= 0 print (((fsavail("/")>=0) '' : 'not'), "ok 3\n");
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The first thing you should do is check that the module and, therefore, the XS library can be loaded correctly You do this by printing the preamble in a BEGIN block and printing an error via the END block if the module didn t load This will be automatically generated for you if you use the h2xs script Each individual test is then executed, printing OK or not OK accordingly Remember to create tests that are compatible I could have equally requested the space on the /users file system, which is perfect for my system but may not appear on other people s systems This would have caused the functions to fail, even though the functions may be working perfectly
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The h2xs utility, which was covered near the start of the extension-making process covered in this chapter, created a number of files, including one called MakefilePL This file is a Perl makefile, similar in principle to the file used by make to build Perl in the first place The content of the file produced by the h2xs program is very basic, but it provides enough configuration information to the MakeMaker module to generate a makefile for automatically building your extension In fact, the file produced will split your module into any component parts, generate the C source from your XS definition file, and compile the source code into a library suitable for use within your Perl scripts It takes all the guesswork and trials out of the compilation process, automatically specifying the correct location of headers and libraries so that the extension compiles correctly If you ve written any documentation for your module, it will create the man file for the module, suitable for inclusion with the man pages for other modules and extensions Finally, MakeMaker provides all the necessary installation routines for copying your module, extension libraries, and documentation into the platform-specific directory of the machine you want to install the extension on Better still, because the source definition for the makefile is written in Perl, you can package the raw files that is, the MakefilePL, Modulepm, Modulexs, and any typemap file and send them to another machine, or even other users, and they can install and compile the module for their machines The process accounts for all of the platform specifics, such as file locations and the available C compiler, and installs your module and extension in the right place This is the way most of the modules on CPAN are supplied Even some of the Perl extensions, such as NDBM_File, are supplied in this way within the Perl distribution During the build process, the main Perl makefile runs the necessary commands to
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extract the makefile for the module in question, before asking make to parse the file and produce and build the extension I frequently use the h2xs command on an empty header file It provides a complete set of skeleton files for any XS development All you have to do is fill in the blanks something many people would argue is the complex part This only adds more weight to the use of h2xs, as it takes all the guesswork out of the development process Make a change to the XS file, and then just type make to produce and compile the library Then use make install to install the library, ready for use Because the format of the MakefilePL file can be customized to incorporate all sorts of features and abilities, it is the subject of 25 at the end of Part IV Before you refer to that chapter, I should explain that the reason it is at the end is because it should be the last thing you do before supplying your extension to the world at large Before then, you should ensure that your module is debugged (see 21), and you might want to investigate the Perl compiler, which provides other useful information and abilities (see 22)
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