Simon McVittie:
You mean like libsystemd, which looks in /run to see whether systemd
is in use, talks to it if it is, and returns some suitable error code
(-ENOSYS?) if it isn't? :-)
Here's interesting for you. (-:
Here's libsystemd and Arturo Borrero Gonzalez's code that calls it.
Please point to the line that checks in /run for systemd running.
*
https://github.com/formorer/pkg-conntrack-tools/blob/1ed72f0e691bbd92a78a0a944a9c448260e6ff41/src/systemd.c#L30
*
https://github.com/systemd/systemd/blob/master/src/libsystemd/sd-daemon/sd-daemon.c#L404
