The udev_root value.
.RE
.PP
+\fB$sys\fR, \fB%S\fR
+.RS 4
+The sysfs mount point.
+.RE
+.PP
\fB$tempnode\fR, \fB%N\fR
.RS 4
The name of a created temporary device node to provide access to the device from a external program before the real node is created.