[Bug libc/21542] New: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21542

            Bug ID: 21542
           Summary: Use conservative default for sysconf
                    (_SC_NPROCESSORS_ONLN)
           Product: glibc
           Version: 2.25
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Currently, if running in a chroot environment without /proc and /sys, sysconf
(_SC_NPROCESSORS_ONLN) can return 1 on a multi-processor system.  This breaks
applications which use the return value to recognize uniprocessor systems and
apply optimizations based on that.

ysconf (_SC_NPROCESSORS_ONLN) should return 2 instead, which is a more
conservative approximation.  It can be inefficient, but at least it will not be
completely incorrect.

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