@Heywood Floyd: that works, but what exactly am I permitted to use inside the handler, as I assume it's a C function? This might be a useless question as non-atomic operations touching global data aren't supposed to be in signal handlers, but I'm still interested to know.
@Alex Rønne Petersen: what exactly is https://github.com/D-Programming-Language/druntime/blob/master/src/core/sys/posix/signal.d? I don't see it mentioned anywhere on dlang.org? :/ I'm still new to all this stuff. When programming in C, everything I ever needed was in the default repositories of my Linux distribution, so I neved needed to worry about anything. :) Thanks, Matej