hubertf's NetBSD Blog
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[20080428] Reducing libc size
In embedded environments, space is always scarce - be it physically, for storage (disk/flash space), or for for computer memory. Mikko Rapeli has made that experience with NetBSD, and posted his solution, which is to reduce NetBSD's libc in size -- see his documentation!

Jörg Sonnenberger pointed out that another possible approach to save both diskspace and also (to some extent) RAM when running executables is not to use shared libs, but to use NetBSD's "crunchgen". Crunchgen statically links multiple binaries and their libs into a single executable, saving diskspace and RAM -- exactly what "busybox" does in the Linux world, just highly configurable and working with any sources. This is a very cool feature of NetBSD, which is used to prepare the install media from src/distrib, but it's also a very undocumented area of NetBSD. Any takers for a "beastybox" article? :-)

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[20050910] Upcoming compat kernel and libc changes
Christos Zoulas has made a stab at revamping the compat infrastructure of the kernel and libc, see his posting for all the information.

As far as I understand, the problem addressed by the compat framework is to "version" system call, i.e. to have (say) an old version 1.2 and a new version 1.3 of things like stat(2) and glob(3) with different semantics and arguments. The way this is done right now is similar to adding some #defines that make glob(3) and stat(2) calls really call things like __glob13() and __stat13(), which then map to the apporpriate kernel versions. That way old binaries will still work, even when they were linked against functions stat() and glob() (i.e. when they were linked before the system call was started to get versioned at all). Christos' work tries to sort out the resulting mess that evolved over time from this by moving around header files etc.

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Disclaimer: All opinion expressed here is purely my own. No responsibility is taken for anything.

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