'\" t
.TH "SD_BUS_PROCESS" "3" "" "elogind 239.3" "sd_bus_process"
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.SH "NAME"
sd_bus_process \- Drive the connection
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <elogind/sd\-bus\&.h>
.fi
.ft
.HP \w'int\ sd_bus_process('u
.BI "int sd_bus_process(sd_bus\ *" "bus" ", sd_bus_message\ **" "r" ");"
.SH "DESCRIPTION"
.PP
\fBsd_bus_process()\fR
drives the connection between the message bus and the client\&. That is, it handles connecting, authentication, and message processing\&. It should be called in a loop until no further progress can be made or an error occurs\&.
.PP
Once no further progress can be made,
\fBsd_bus_wait\fR(3)
should be called\&. Alternatively the user can wait for incoming data on the file descriptor returned by
\fBsd_bus_get_fd\fR(3)\&.
.PP
\fBsd_bus_process\fR
processes at most one incoming message per call\&. If the parameter
\fIr\fR
is not NULL and the call processed a message,
*r
is set to this message\&. The caller owns a reference to this message and should call
\fBsd_bus_message_unref\fR(3)
when the message is no longer needed\&. If
\fIr\fR
is not NULL, progress was made, but no message was processed,
*r
is set to NULL\&.
.SH "RETURN VALUE"
.PP
If progress was made, a positive integer is returned\&. If no progress was made, 0 is returned\&. If an error occurs, a negative errno\-style error code is returned\&.
.SH "SEE ALSO"
.PP

\fBelogind\fR(8),

\fBsd-bus\fR(3),