PSEUDO(5) File Formats and Configurations PSEUDO(5)

NAME

pseudo - configuration files for pseudo device drivers

DESCRIPTION

Pseudo devices are devices that are implemented entirely in software.
Drivers for pseudo devices must provide driver configuration files to
inform the system of each pseudo device that should be created.


Configuration files for pseudo device drivers must identify the
parent driver explicitly as pseudo, and must create an integer
property called instance which is unique to this entry in the
configuration file.


Each entry in the configuration file creates a prototype devinfo
node. Each node is assigned an instance number which is determined by
the value of the instance property. This property is only applicable
to children of the pseudo parent, and is required since pseudo
devices have no hardware address from which to determine the instance
number. See driver.conf(5) for further details of configuration file
syntax.

EXAMPLES

Example 1: A sample configuration file.

Here is a configuration file called ramdisk.conf for a pseudo device
driver that implements a RAM disk. This file creates two nodes called
"ramdisk". The first entry creates ramdisk node instance 0, and the
second creates ramdisk node, instance 1, with the additional disk-
size property set to 512.


#
# Copyright (c) 1993, by Sun Microsystems, Inc.
#
#ident "@(#)ramdisk.conf 1.3 93/06/04 SMI"
name="ramdisk" parent="pseudo" instance=0;
name="ramdisk" parent="pseudo" instance=1 disk-size=512;

SEE ALSO

driver.conf(5), ddi_prop_op(9F)


Writing Device Drivers

June 15, 1993 PSEUDO(5)