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[[meta copyright="Copyright © 2008, 2009 Free Software Foundation, Inc."]]
[[meta license="""[[toggle id="license" text="GFDL 1.2+"]][[toggleable
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Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
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[[meta title="Bindings to Other Programming Languages"]]
The main idea of the Hurd design is giving users the ability to easily
modify/extend the system's functionality ([[extensible_system|extensibility]]).
This is done by creating [[filesystem_translators|hurd/translator]] and other
kinds of Hurd servers.
However, in practice this is not as easy as it should, because creating
translators and other servers is quite involved -- the interfaces for doing
that are not exactly simple, and available only for C programs. Being able to
easily create simple translators in RAD languages is highly desirable, to
really be able to reap the advantages of the Hurd architecture.
Originally Lisp was meant to be the second system language besides C in the GNU
system; but that doesn't mean we are bound to Lisp. Bindings for any popular
high-level language, that helps quickly creating simple programs, are highly
welcome.
Several approaches are possible when creating such bindings. One way is simply
to provide wrappers to all the available C libraries ([[hurd/libtrivfs]], [[hurd/libnetfs]]
etc.). While this is easy (it requires relatively little consideration), it may
not be the optimal solution. It is preferable to hook in at a lower level, thus
being able te create interfaces that are specially adapted to make good use of
the features available in the respective language.
These more specialised bindings could hook in at some of the lower level
library interfaces ([[hurd/libports]], [[hurd/glibc]], etc.); use the
[[microkernel/mach/MIG]]-provided [[microkernel/mach/RPC]] stubs directly; or
even create native stubs directly from the interface definitions. The
[[lisp_bindings_created_by_Flavio_Cruz|flaviocruz]] in last year's GSoC mostly
use the latter approach, and can serve as a good example.
The task is to create easy to use Hurd bindings for a language of the student's
choice, and some example servers to prove that it works well in practice. This
project will require gaining a very good understanding of the various Hurd
interfaces. Skills in designing nice programming interfaces are a must.
There has already been some [earlier work on Python
bindings](http://www.sigill.org/files/pytrivfs-20060724-ro-test1.tar.bz2), that
perhaps can be re-used. Also some work on [Perl
bindings](http://www.nongnu.org/hurdextras/#pith) is availabled.
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