SD_BOOTED(3)

  .SH "NAME" sd_booted - Test whether the system is running the systemd init system
  .SH "SYNOPSIS"

#include <systemd/sd-daemon.h>

      .HP u int sd_booted(void);

  .SH "DESCRIPTION"

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

  .SH "RETURN VALUE"

    .PP 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.

  .SH "NOTES"

    .PP These APIs are implemented as a shared library, which can be compiled and linked to with the libsystemd pkg-config(1) file.
    .PP 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.

  .SH "SEE ALSO"

    .PP systemd(1), sd-daemon(3)