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Subject: Re: Bug: Synchronous signals broken on Cygwin 64
To: cygwin AT cygwin DOT com
References: <bc993d03-a9ac-d1c9-c33a-03cfc810edbe AT users DOT sourceforge DOT net> <d76cfa4797d30702799a93892d454d95 AT smtp-cloud9 DOT xs4all DOT net>
From: Thomas Zimmermann <tdz AT users DOT sourceforge DOT net>
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Autocrypt: addr=tdz AT users DOT sourceforge DOT net; prefer-encrypt=mutual; keydata= xsDiBEQ8FzARBAD9199cx5bJZ7nvSuaGA6ZLv1WyPtIeKWXj8mOfpn/tfmKUlzFijUChGBGP 1/FGssV/KnR+1zWdxsgtYuE8bbslJEGRP/fgaOgxisCKjkU8/SKXKKYoxS568m2TwBO512so PTj2mC3yWz4nU7ZTmgoJzf8r8TDZ3GBbHCoO21tUjwCgkjiAm08Kh72NtbMysXW88eOcFfUE ANvt1VrkyDjLD/viv7MHYUMLKLaFdNZUnJi4Rx6NwIqNxLDeGyPPp17/X2ls397Wl9PAZRJB 96/3E5WAOCyaKJc605luoyvv0CJ5+VuAQDVXKGdX/jr7EnhkyXmcm8ChKR/1Lct6jn5Wp922 utdklQcYEkSNMJbRsKReluxXaD6kBAC2qI/mOyRtJLxoszYG2hLf1BAOopJb13J1TCRQv3Df El2zmbPyYOfMQzbnFBrZ5yMve6I5/9hWksMMUWrdtgGDEsBFMa8iFb9FPsbKrDBmR66wpNFf s7GPEcWpIueBGu+vmXtUN8zE4mvUxFixc7iiPx46TCctKFqujGf6ubhlpc0tVGhvbWFzIFpp bW1lcm1hbm4gPHRkekB1c2Vycy5zb3VyY2Vmb3JnZS5uZXQ+wl0EExECAB0FAkQ8FzAGCwkI BwMCBBUCCAMEFgIDAQIeAQIXgAAKCRDZ2tfUTvHfCIydAJ4ndgH+dGp131Bx0su0VkWIiCfg iwCdHB339NSWt0kXY4+/Zhfpenzj9EXOwE0ERDwXMRAEAKcJyo9UpIp4Z4Mer58CL+ErcgwU xWdH5yhRV0++D70R6N5e+Yoa20V5trrNhpCEeAvjLW77VRqCYPO3hn0mmN2jSO8qMdBn7rXS ND9WFrlnSSCGsYQeoKj0z2KlQ8Waxg+r3b23azbMinF30x9303S3ZhrWvSf8wxIgd+u3HeXj AAMGA/9s/AWniacRR8T2ABN0ASjXp1SCSYmezL9Jp8MfSWvLcNrB/0Oi/o3+1HfJiTHg7o8l H6tpqScWsKpPZbYxmo9vb9sVjAOLzGpeV8S6Pe1pcXfiOuZLMJ5OTga6GxWimmP7rrWKTIlP x57wXD+v6c4A4VYW973YXNh1mVXwON3ydMJGBBgRAgAGBQJEPBcxAAoJENna19RO8d8IASEA niQqMp4Yd00/t47D09opsugE9GBHAJ9sJZgtyq9lLB3xCFm16nooejR/XA==
Message-ID: <4a3b47db-fcdb-85f0-ec80-4cffcb7c495a@users.sourceforge.net>
Date: Thu, 26 Apr 2018 12:52:54 +0200
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From: Thomas Zimmermann <tdz AT users DOT sourceforge DOT net>
To: cygwin AT cygwin DOT com
Message-ID: <4a3b47db-fcdb-85f0-ec80-4cffcb7c495a AT users DOT sourceforge DOT net>
Subject: Re: Bug: Synchronous signals broken on Cygwin 64
References: <bc993d03-a9ac-d1c9-c33a-03cfc810edbe AT users DOT sourceforge DOT net>
 <d76cfa4797d30702799a93892d454d95 AT smtp-cloud9 DOT xs4all DOT net>
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Hi

Am 26.04.2018 um 12:45 schrieb Houder:
>> The expected behavior is that an installed signal handler runs exactly
>> once for a signal and the OS terminates the program if the handler
>> returns. This works on 32-bit Cygwin. From my observation, Cygwin 64
>> differs in the follow ways:
>=20
> .. uhm, unless SA_RESETHAND (sa_flags) has been specified, I expect the
> handler to be invoked again and again ...

What I mean is that the installed signal handler is re-called constantly
for the same HW exception (div-by-zero in this case). It is as if
there's an endless loop around the signal-handler function.

Best regards
Thomas

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Implement thread-safe and fault-tolerant software in C: visit picotm.org
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