[Bug libc/4737] fork is not async-signal-safe

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=4737

--- Comment #26 from Florian Weimer <fweimer at redhat dot com> ---
With this commit

commit 56290d6e762c1194547e73ff0b948cd79d3a1e03
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu May 12 08:54:17 2016 +0200

    Increase fork signal safety for single-threaded processes [BZ #19703]

and the follow-up fix for a regression

commit 669ff911e2571f74a2668493e326ac9a505776bd
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Feb 8 12:46:19 2019 +0100

    nptl: Avoid fork handler lock for async-signal-safe fork [BZ #24161]


we have an async-signal-safe fork for single-threaded processes.

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