Index · Directives systemd 250


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.

Return Value

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.

See Also

systemd(1), sd-daemon(3)