'\" t
.TH "SD_BUS_NEW" "3" "" "systemd 219" "sd_bus_new"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
sd_bus_new, sd_bus_ref, sd_bus_unref \- Create a new bus object and create or destroy references to it
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <systemd/sd\-bus\&.h>
.fi
.ft
.HP \w'int\ sd_bus_new('u
.BI "int sd_bus_new(sd_bus\ **" "bus" ");"
.HP \w'sd_bus\ *sd_bus_ref('u
.BI "sd_bus *sd_bus_ref(sd_bus\ *" "bus" ");"
.HP \w'sd_bus\ *sd_bus_unref('u
.BI "sd_bus *sd_bus_unref(sd_bus\ *" "bus" ");"
.SH "DESCRIPTION"
.PP
\fBsd_bus_new()\fR
creates a new bus object\&. This object is reference\-counted, and will be destroyed when all references are gone\&. Initially, the caller of this function owns the sole reference\&.
.PP
\fBsd_bus_ref()\fR
creates a new reference to
\fIbus\fR\&. This bus object will not be destroyed until
\fBsd_bus_unref()\fR
has been called as many times plus once more\&. Once the reference count has dropped to zero,
\fIbus\fR
cannot be used anymore, so further calls to
\fBsd_bus_ref()\fR
or
\fBsd_bus_unref()\fR
are illegal\&.
.PP
\fBsd_bus_unref()\fR
destroys a reference to
\fIbus\fR\&.
.SH "RETURN VALUE"
.PP
On success,
\fBsd_bus_new()\fR
returns 0 or a positive integer\&. On failure, it returns a negative errno\-style error code\&.
.PP
\fBsd_bus_ref\fR
always returns the argument\&.
.PP
\fBsd_bus_unref\fR
always returns
\fBNULL\fR\&.
.SH "ERRORS"
.PP
Returned errors may indicate the following problems:
.PP
\fB\-ENOMEM\fR
.RS 4
Memory allocation failed\&.
.RE
.SH "NOTES"
.PP
\fBsd_bus_new()\fR
and other functions described here are available as a shared library, which can be compiled and linked to with the
\fBlibsystemd\fR\ \&\fBpkg-config\fR(1)
file\&.
.SH "SEE ALSO"
.PP
\fBsystemd\fR(1),
\fBsd-bus\fR(3),
\fBsd_bus_open_user\fR(3),
\fBsd_bus_open_system\fR(3),
\fBsd_bus_default_user\fR(3),
\fBsd_bus_default_system\fR(3)