Consensus on MT-, AS- and AC-Safety docs.

[Andreas Schwab]

"Carlos O'Donell" <carlos@redhat.com> writes:

> * Was it ever POSIX's intent to allow a signal handler to
>   modify the errno of the interrupted code sequence or was
>   that simply a consequence of being a signal handler and
>   modifying global state?

<http://pubs.opengroup.org/onlinepubs/9699919799/functions/sigaction.htm>:

    Note in particular that even the "safe" functions may modify errno; the
    signal-catching function, if not executing as an independent thread,
    should save and restore its value in order to avoid the possibility that
    delivery of a signal in between an error return from a function that
    sets errno and the subsequent examination of errno could result in the
    signal-catching function changing the value of errno.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
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