sd_booted man page on Fedora

sd_booted man page on Fedora

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SD_BOOTED(3)			   sd_booted			  SD_BOOTED(3)

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

SYNOPSIS
       #include <systemd/sd-daemon.h>

       int sd_booted(void);

DESCRIPTION
       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.

NOTES
       This function is provided by the reference implementation of APIs for
       new-style daemons and distributed with the systemd package. The
       algorithm it implements is simple, and can easily be reimplemented in
       daemons if it is important to support this interface without using the
       reference implementation.

       Internally, this function checks whether the /sys/fs/cgroup/systemd
       virtual file system is mounted, by comparing the st_dev value of the
       stat() data of /sys/fs/cgroup and /sys/fs/cgroup/systemd.

       For details about the algorithm check the liberally licensed reference
       implementation sources:
       http://cgit.freedesktop.org/systemd/systemd/plain/src/sd-daemon.c resp.
       http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-daemon.h

       sd_booted() is implemented in the reference implementation's
       sd-daemon.c and sd-daemon.h files. These interfaces are available as
       shared library, which can be compiled and linked to with the
       libsystemd-daemon pkg-config(1) file. Alternatively, applications
       consuming these APIs may copy the implementation into their source
       tree. For more details about the reference implementation see
       sd_daemon(7).

       If the reference implementation is used as drop-in files and
       -DDISABLE_SYSTEMD is set during compilation this function will always
       return 0 and otherwise become a NOP.

SEE ALSO
       systemd(1), sd_daemon(7)

AUTHOR
       Lennart Poettering <lennart@poettering.net>
	   Developer

systemd				  05/23/2012			  SD_BOOTED(3)

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