On Thu, Nov 01, 2018 at 10:53:40AM -0700, Andy Lutomirski wrote: > If a handler is registered, then, if a synchronous exception happens > (page fault, etc), the kernel would set up an exception frame as usual > but, rather than checking for signal handlers, it would just call the > registered handler. That handler is expected to either handle the > exception entirely on its own or to call one of two new syscalls to > ask for normal signal delivery or to ask to retry the faulting > instruction. Why the syscalls are required? Couldn't the handler have just a return value to indicate the appropriate action? Another thing that I'm wondering is that what if a signal occurs inside the exception handler? /Jarkko
