Hi all: hope you guys are doing great!. So i have a few questions, hope this is the best place for them.
I've been doing a lot of work with `sd-bus.h` (basically i've been trying to bind it to other languages to then interact with systemd natively). I've been reading the man pages/blog post/general docs, but mostly the src code. and i stumble across https://github.com/systemd/systemd/blob/master/src/shared/bus-util.c#L598-L605 and saw that you can connect to systemd using the sockets, for root would be `/run/systemd/private`, and for users something like `/run/user/<uid>/systemd/private` and this trigger lots of questions, that i have not been able to answer, so here they are: Question 1) what would be the advantage of connecting through dbus instead of directly through the socket? the way i connect to systemd is with `sd_bus_open_system` but i can also do ``` sd_bus_new(&bus); sd_bus_set_address(bus, "unix:path=/run/systemd/private"); sd_bus_start(bus); ``` why (or when) would one be better than the other? question 2); i also look that you can do the same with the user connections (and this is mostly true when the --user flag is given, at least on systemd-run), and you can connect to something like `/run/user/<uid>/systemd/private`, where `/run/user/<uid>` is $XDG_RUNTIME_DIR, and i guess this is really the best form to connect to systemd as a user, but is there any difference between using that socket or doing `sd_bus_open_user`. ? question 3) systemd source code is pretty clear, really easy to learn from, also sd-bus.h is incredible helpful and easy to use. But the docs is good, don't get me wrong, but it could definitely use more love. for instance the usage of the sockets `/run/{user/uid,}/systemd/private`, is not documented anywhere that i could find. is this intentional?, is this because this is a implementation detail that may change in the future?. if so, what would be the correct way to connect to systemd's socket? i was particularly surprise that the sockets' path are hardcoded in the code. if this parts have not just gotten into the docs, i would be more than happy to submit the PR for the docs. Thank you guys! Alvaro Leiva
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