sd_booted — Test whether the system is running the systemd init system
#include <systemd/sd-daemon.h>
int sd_booted( | void); |
On failure, this call returns a negative errno-style error code. If the system was booted up with systemd as init system, this call returns a positive return value, zero otherwise.
These APIs are implemented as a shared
library, which can be compiled and linked to with the
libsystemd pkg-config(1)
file.
Internally, this function checks whether the directory
/run/systemd/system/ exists. A simple check
like this can also be implemented trivially in shell or any other
language.