Re: sleep from terminal

In article <haberg-0301061058340001@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
haberg@xxxxxxxxxx (Hans Aberg) wrote:

> In article <znu-F6B1F2.20180502012006@xxxxxxxxxxxxxx>, ZnU
> <znu@xxxxxxxxxxxx> wrote:
>
> > > Then stuff, like sleep and probably some drivers, that does not fit
> > > into that model is added by code external to that. This is what is
> > > causing kernel panics, external faulty code that the UNIX
> > > kernel cannot handle. So if one should get the UNIX kernel to handle
> > > things like sleep, it must call an external Mac OS X program that can
> > > do the job. AppleScript evidently can do it (by the other posts).
> >
> > Power management, including sleeping, is definitely something handled
> > within the kernel. Whether it's actually in the base kernel code or in a
> > kernel extension isn't really relevant; it all ends up in kernel space
> > at run-time.
>
> Sure it is relevant, whether it is in the UNIX kernel, or if it is in
> non-UNIX kernel extensions, as it affects reliability, for example.
>
> The situations seems to be like that of Tenon BSD UNIX running as a
> program within Mac OS 9. In that case, the reliability and capacities of
> the UNIX programs are limited by Mac OS 9 reliability.
>
> For Mac OS X, it seems that one has added a mini-OS, by which the FreeBSD
> and its Mach kernel run within.

There is no separate 'UNIX kernel' component in OS X. There's just a
kernel, called 'xnu', which contains Mach code, code borrowed from
various BSD systems, and a bunch of code written by Apple and NeXT over
the last couple of decades. Then, there are a bunch of kernel modules
which extend the kernel, to add support for specific hardware, file
systems, etc. Everything else, including everything that makes OS X
Mac-like, runs *on top* of this kernel.

> > But just because something is in the kernel, doesn't mean there's a *nix
> > command to access it. And just because something is outside of the
> > kernel, doesn't mean a *nix command can't access it.
>
> The original the answer I gave, was for a UNIX shell command; I should
> have added that one must call something without that UNIX environment to
> get the effect. The answer given, using AppleScript, also gives hint that
> some of these things cannot be handled within the UNIX proper itself.

There *is* nothing in OS X which occurs outside of the *nix environment.

> Sure, Apple has added commands by which it seems almost anything can be
> run from a suitable Apple shell command, and in later Mac OS X versions,
> more and more it put over to the UNIX part proper.

Once again, there is no separate UNIX environment in OS X. OS X is a
*nix operating system. All the Mac-like stuff runs *within* this
environment.

--
"Those who enter the country illegally violate the law."
-- George W. Bush in Tucson, Ariz., Nov. 28, 2005
.

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