pseudo(4) [freebsd man page]

pseudo(4)							   File Formats 							 pseudo(4)

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(4) 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(4), ddi_prop_op(9F)

       Writing Device Drivers

SunOS 5.10							    15 Jun 1993 							 pseudo(4)