syscall calling question

[Attilio Rao]

The only functions can be called at userspace are syscalls through
software interrupt.

Attilio

2006/5/6, Gergely CZUCZY <phoemix at harmless.hu>:
> hello,
>
> There's an issue on jails i've decided to look into
> (jails keep on stucking into the system). Yet, i examining
> the 6-STABLE tree, and there is a point i don't understands
>
> in libc.so.6 there is jail_attach (i've picked a call) defined,
> while i was unable to find any jail-related functions defined in
> lib/libc. The only place they are defined is under kern/kern_jail.c,
> which has a different prototype than the one in the libc (according
> to the manual page and the source of jexec(8)).
>
> my question is, from a userland libcall, how does a kernel-functions
> be invoked? i couldn't figure it out by looking at the source, and
> also the developers handbook hadn't told this to me.
>
> Bye,
>
> Gergely Czuczy
> mailto: gergely.czuczy at harmless.hu
> PGP: http://phoemix.harmless.hu/phoemix.pgp
>
> Weenies test. Geniuses solve problems that arise.
>
>
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>


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