As a fan of C, I have to disagree. To quote OS X's `man signal`:

    void (*signal(int sig, void (*func)(int)))(int);

    or in the equivalent but easier to read typedef'd version:

    typedef void (*sig_t) (int);
    sig_t signal(int sig, sig_t func);

In, say, Go, this would be

    func signal(sig int, newFunc func(int)) func(int)

which imo is cleaner (it's clear that the second argument and return value have the same type, without having to use a typedef) without sacrificing power.