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: > > .. 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 -- Implement thread-safe and fault-tolerant software in C: visit picotm.org -- GnuPG: http://tdz.users.sourceforge.net/tdz.asc Fingerprint: 16FF F599 82F8 E5AA 18C6 5220 D9DA D7D4 4EF1 DF08 Website: tzimmermann.org