'\" t
.TH "SD_BOOTED" "3" "" "systemd 204" "sd_booted"
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.SH "NAME"
sd_booted \- Test whether the system is running the systemd init system
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <systemd/sd\-daemon\&.h>
.fi
.ft
.HP \w'int\ sd_booted('u
.BI "int sd_booted(void);"
.SH "DESCRIPTION"
.PP
\fBsd_booted()\fR
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
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\&.
.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\&.
.PP
For details about the algorithm check the liberally licensed reference implementation sources:
\m[blue]\fB\%http://cgit.freedesktop.org/systemd/systemd/plain/src/libsystemd-daemon/sd-daemon.c\fR\m[]
and
\m[blue]\fB\%http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-daemon.h\fR\m[]
.PP
\fBsd_booted()\fR
is implemented in the reference implementation\*(Aqs
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
\fBpkg-config\fR(1)
file\&. Alternatively, applications consuming these APIs may copy the implementation into their source tree\&. For more details about the reference implementation see
\fBsd-daemon\fR(3)\&.
.PP
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\&.
.SH "SEE ALSO"
.PP

\fBsystemd\fR(1),
\fBsd-daemon\fR(3)