> > I want to catch stack overflow exceptions in my program. > > I use sigaltstack to set up alternate stack on which SIGSEGV signals should > > processed, and siglongjmp from signal handler to jump to restore point. > > > > But in this case signal handler executes on alternate stack only once. > > In next times signal handler executes on main program stack. > > Yep, known bug. Need to add a function (with MD implementation) to > return the stack pointer from the userframe, then use that to test > whether the thread is running on its altstack instead of the current > implementation which sets a flag when a signal is delivered to a > thread that puts it on its altstack and only clears that flag when > sigreturn() is invoked. > > It would be nice if you could convert your test program into something > that fits under regress/, so that we can have a test for this going > forward... >
Thank you. It turns out that regression test already present -- regress/sys/kern/stackjmp Best regards, Alexander.
