https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284660

            Bug ID: 284660
           Summary: sigaction(2) anachronism
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Manual Pages
          Assignee: b...@freebsd.org
          Reporter: r...@gid.co.uk
                CC: d...@freebsd.org

In the last paragraph under NOTES, the page says:

"Also, it  is good practice to make a copy of the global variable errno and
restore it before returning from the signal handler."

It's a long time since errno was a global variable.

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