> Again, a signal handler that is blocked from running except during epoll_pwait() has no special safety concerns different from those of a regular function cal

> Again, a signal handler that is blocked from running except during epoll_pwait() has no special safety concerns different from those of a regular function call. You're absolutely correct. Mea culpa for objecting too soon. I would've deleted my comment immediately after submitting as discussing my sigaltstack made me realize my error. But I got locked out by the procrastination setting. :(