[Bug 230330] _SC_NPROCESSORS_ONLN reports offline CPUs

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

--- Comment #9 from Mark Millard <[email protected]> ---
(In reply to Mark Millard from comment #7)

Looking at the code that resulted is probably easier than
interpreting the bugzilla wording:

https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=97a912f7a832a662960749948049e15f3aecb2a7;hp=f787e138aa0bf677bf74fa2a08595c446292f3d7
shows:

__get_nprocs now first tries:

int result = read_sysfs_file ("/sys/devices/system/cpu/online");

__get_nprocs_conf now first tries:

int result = read_sysfs_file ("/sys/devices/system/cpu/possible");

It was __get_nprocs_conf that had the semantic change back to the
old way. __get_nprocs had stayed with /sys/devices/system/cpu/online
use in the first place.

For reference:

   case _SC_NPROCESSORS_CONF:
     return __get_nprocs_conf ();

   case _SC_NPROCESSORS_ONLN:
     return __get_nprocs ();

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