Per Hedbor () @ Pike (-) developers forum wrote:

Also, on a somewhat related note, does catching SIGSEGV not work for some reason?

*Catching* SIGSEGVs works fine, however... a. You should be able to distinguish segmentation faults caused by your flaky mmap() from other segfaults. That might be harder than you think (in the generic case it ultimately requires dissassembly of the instruction at the point of failure, including knowledge of the register content, which implies knowledge of the stack layout used to save the registers). b. When you return from the signal-trap-function you should either have made sure that the memory access now succeeds (making sure of that involves knowing what caused it, see (a)), or you should make sure that the thread that caused it is killed accordingly, or you should unwind the stackframe using a longjmp() back to safety.

So, yes, you can catch the SIGSEGV, but the trick is doing "the right thing" after that.

Still, doing the checks that are done now in mmap does not in any way provide protection against sigsegvs.

Granted.

No, it works just fine as far as I know.