Corrections for signal handlers

[Markus Elfring]

Hello,

Some signal handler implementations are also affected by technical details that are described in an article by Justin Pincar.
https://www.securecoding.cert.org/confluence/display/seccode/SIG30-C.+Call+only+asynchronous-safe+functions+within+signal+handlers

Would you like to adjust any source code for the bug report "Fix signal handler"?
http://bugs.winehq.org/show_bug.cgi?id=14789

Regards,
Markus
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