Let's clean this up a bit, following our usual nomenclature to name return parameters ret-xyz. This is mostly a bit of renaming, but there's also some minor other changes: if we return a pointer to a mmap'ed object plus its offset, in almost all cases we are happy if either parameter is NULL in case the caller is not interested in it. Let's fix the remaining case to do this too, to minimize surprises.
System and Service Manager
Details
Most documentation is available on systemd's web site.
Assorted, older, general information about systemd can be found in the systemd Wiki.
Information about build requirements is provided in the README file.
Consult our NEWS file for information about what's new in the most recent systemd versions.
Please see the Hacking guide for information on how to hack on systemd and test your modifications.
Please see our Contribution Guidelines for more information about filing GitHub Issues and posting GitHub Pull Requests.
When preparing patches for systemd, please follow our Coding Style Guidelines.
If you are looking for support, please contact our mailing list or join our IRC channel.
Stable branches with backported patches are available in the stable repo.