compat.linux.osrelease behavior

[Alexander Leidinger]

On Fri, 18 Sep 2009 15:08:31 +0200 (CEST) Alexander Best
<alexbestms at math.uni-muenster.de> wrote:


> hi there,
> 
> i have a question regarding the behavior of compat.linux.osrelease.
> setting it to 2.4.2 sets linuxulator into 2.4 kernel-emulation and
> 2.6.16 sets it into 2.6 kernel-emulation right?

Sort of. 2.6.x set's 2.6 mode, and everything else is 2.4 mode. But
this is AFAIK only a semantic change of some functions. This does not
disable syscalls which are in 2.6 but not in 2.4.

> but what happens when compat.linux.osrelease gets set to a different
> value? ports/Updating entry 20071101 e.g. advises skype users to set
> compat.linux.osrelease to 2.4.20. does this trigger 2.6
> kernel-emulation because 2.4.20 > 2.4.2 or are there more than two
> kernel-emulation layers inside the linuxulator??

It does not affect the kernel emulation. But the glibc will try to use
new syscalls.

Bye,
Alexander.