Manpages - sd_booted.3

sd_booted - Test whether the system is running the systemd init system

  #include <systemd/sd-daemon.h>

int sd_booted(void);

sd_booted() checks whether the system was booted up using the systemd init system.

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.

*systemd*(1), *sd-daemon*(3)