Before I'm working on the PR, I need to know why not use libuv to poll libinput with event loop? Using systemd on most embedded system is like driving a bus to a picnic site where the only passenger is spouse and the rest seats are left empty. In our case, we included around 25 systemd binaries with some unrelated services including systemd-machined, but we only need sd-event. This is a huge resource waste for embedded system. If you think it's okay to replace systemd with libuv, I'm going to continue finish the PR. Thanks!