[Bug libc/19701] New: Restore errno around signal handlers

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

https://sourceware.org/bugzilla/show_bug.cgi?id=19701

            Bug ID: 19701
           Summary: Restore errno around signal handlers
           Product: glibc
           Version: 2.24
            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: ---

Future POSIX versions allow preserving the errno variable of the interrupted
thread in a signal handler.  We should implement this because a lot of
application code does not handle this correctly, which can result in
difficult-to-debug rare failures.

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