ddi_get_instance(9F) Kernel Functions for Drivers ddi_get_instance(9F)NAMEddi_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
The ddi_get_instance() function returns the instance number of the
device corresponding to dip.
The system assigns an instance number to every device. Instance num‐
bers for devices attached to the same driver are unique. This pro‐
vides 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
The ddi_get_instance() function returns the instance number of the
device corresponding to dip.
CONTEXT
The ddi_get_instance() function can be called from user, interrupt, or
kernel context.
SEE ALSOpath_to_inst(4)
Writing Device Drivers
SunOS 5.11 16 Jan 2006 ddi_get_instance(9F)