It was added originally in 65f568bbeb9b8c70200e44c19a797df3a0bfd485. The API is has stabilized pretty much, and generally follows the usual style for libsystemd. We've held it as a public-but-private library for almost 10 years, let's export it. sd_netlink_sendv() and sd_nfnl_nft_*() are excluded. libsystemd.so seems to grow by 12k.
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 Code Map for information about this repository's layout and content.
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.