Yes, signalfd() is wonderful and nice, but it makes it a pain in the behind to port your software. If you need to use signals and do it in an event loop of some sort take a look at libev which abstracts away the OS and handles it in the best way possible depending on the system it is run on.

Not only that, but libev will make use of epoll/kqueue/select/poll as required on the OS it is running on, so you get easier portability with the various different event mechanisms that do exist across systems.

It's not particularly hard to emulate (most of) signalfd()'s behavior by writing a byte to a pipe and checking for it in your main loop.