Comment 38 for bug 955379

What cmake is doing is an entirely legitimate and well-recognized Unix idiom for converting signals into effects on filedescriptors for select(), and there's no reason for them to change it. This is absolutely a bug in QEMU, it's just one that's not easy for us to fix. (Using socketpair would not help here. You'd have to use signalfd(), which of course is much less portable.)