[Bug 230330] _SC_NPROCESSORS_ONLN reports offline CPUs

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230330

--- Comment #8 from Jan Beich <jbeich@FreeBSD.org> ---
(In reply to Mark Millard from comment #5)
> I've not checked on Solaris.

Solaris appears to restrict _ONLN and _CONF by zone which is closer to
*_getaffinity solution.
https://src.illumos.org/source/xref/illumos-gate/usr/src/uts/common/syscall/sysconfig.c?r=440a8a36#107-111

Given Solaris uses a syscall glibc probably behaves the same under
Linux-branded zones. I'm not familar with Solaris to find how it implements
/sys/devices/system/cpu

> But _SC_NPROCESSORS_ONLN and _SC_NPROCESSORS_CONF as names are not from/for POSIX.

I've linked a POSIX proposal in "See also" here. It has a suggestion to use
"execution units" instead of "processors" and "available" instead of "online".
One can't get more "execution units" than what cpuset/taskset or
jail/zone/container has provided.

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