AW: UNIX signals on DragonFly

[Sascha Wildner]

> We can add defines but someone would need to research it.  Linux does have
> a RTSIG_MAX (set to 32) in <linux/limits.h> which we do not appear to have.
> There is also a __SIGRTMAX define in linux (set to 64).  I don't see anything for
> a RTSIG_MIN, however.

I don't know if adding just the defines makes a lot of sense.

The SIGRT{MIN,MAX} are the range of signals for which POSIX Real-Time Signals behavior is supported, but we are missing the actual support for that in DragonFly (we're missing a sigqueue(2) system call for example).

This small page by Oracle has more info on POSIX Real-Time Signals:

https://docs.oracle.com/cd/E19048-01/chorus5/806-6897/architecture-123/index.html

Sascha