runit.c seems to rely on a transitive dependency between sys/types.h and
sys/select.h that exists on some systems such as Linux.
When we tried porting runit to managarm we ran into an issue related to
it, where fd_set and timeval weren't declared at time of use in runit.c.
Consulting the Open
It's maybe a little heavy-handed, but is there any technical reason not to
just pick an arbitrary FD, like say 3, and just always use that for a
particular daemon?
For a given daemon, no, there's no reason not to pick an arbitrary fd
and stick to it. That's the intended usage.
For a
