We recently added a new document to the systemd website focussing on one specific facet of the service manager: the fdstore. A concept that people should really use more to facilitate "seamless" service restarts and various other things. Please have a look:

https://systemd.io/FILE_DESCRIPTOR_STORE/

Here's a fun new feature we are working on in systemd: userspace-only reboot. In order to reduce grey-out times on image-based OS updates to next to nothing we are making a reboot happen where kernel stays as it is, but userspace shuts down as usual, then possibly transitions into a new rootfs, and starts up again with an initial transaction as it would on a classic system boot. During the transition selected services can pass along their fds and listening sockets, to pass "live" resources…

So, we are now living in a world where people generate feature requests based on random ideas AI might have? → https://github.com/systemd/systemd/issues/26212

And I thought AI was supposed to reduce the workload on humans, not add more on top!

PSA for C devs: if your library exposes a function that takes a pointer, and you add a "const" to that pointer later on, then yes, that's an API break. Why? Because the prototype of the function changed enough so that anyone taking a pointer of your function won't be able to assign it to the variable they intend to store it in. Yes, C API compat is hard. (libbpf, I am looking at you 👀👀👀, btw)