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Kernel Functions for Driversddi_get_instance(9F)


NAME

 ddi_get_instance - get device instance number

SYNOPSIS

 
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_get_instance(dev_info_t *dip);

INTERFACE LEVEL

 

Solaris DDI specific (Solaris DDI).

PARAMETERS

 
dip
Pointer to dev_info structure.

DESCRIPTION

 

ddi_get_instance() returns the instance number of the device corresponding to dip.

The system assigns an instance number to every device. Instance numbers for devices attached to the same driver are unique. This provides a way for the system and the driver to uniquely identify one or more devices of the same type. The instance number is derived by the system from different properties for different device types in an implementation specific manner.

Once an instance number has been assigned to a device, it will remain the same even across reconfigurations and reboots. Therefore, instance numbers seen by a driver may not appear to be in consecutive order. For example, if device foo0 has been assigned an instance number of 0 and device foo1 has been assigned an instance number of 1, if foo0 is removed, foo1 will continue to be associated with instance number 1 (even though foo1 is now the only device of its type on the system).

RETURN VALUES

 

ddi_get_instance() returns the instance number of the device corresponding to dip.

CONTEXT

 

ddi_get_instance()can be called from user or interrupt context.

SEE ALSO

 

path_to_inst(4)

Writing Device Drivers


SunOS 5.9Go To TopLast Changed 20 Jul 1994

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.