ldi_prop_exists(9F) Kernel Functions for Drivers ldi_prop_exists(9F)NAMEldi_prop_exists - Check for the existence of a property
SYNOPSIS
#include <sys/sunldi.h>
int ldi_prop_exists(ldi_handle_t lh, uint_t flags, char *name);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI)
PARAMETERS
lh Layered handle.
flags Possible flag values are some combination of:
LDI_DEV_T_ANY
Match the lookup request independent of the actual dev_t value that
was used when the property was created. The flag indicates any
dev_t value (including DDI_DEV_T_NONE) associated with a possible
property match satisfies the matching criteria.
DDI_PROP_DONTPASS
Do not pass request to parent device information node if the prop‐
erty is not found.
DDI_PROP_NOTPROM
Do not look at PROM properties (ignored on platforms that do not
support PROM properties).
name
String containing the name of the property.
DESCRIPTIONldi_prop_exists() checks for the existence of a property associated
with a device represented by the layered driver handle, regardless of
the property value data type.
Properties are searched for based on the dip and dev_t values associ‐
ated with the layered handle, and the property name. This association
is handled by the layered driver infrastructure on behalf of the con‐
sumers of ldi_prop_exists().
The property search order is as follows:
1.
Search software-properties created by the driver.
2. Search the software properties created by the system (or nexus
nodes in the device info tree).
3. Search the driver global properties list.
4. If DDI_PROP_NOTPROM is not set, search the PROM properties (if they
exist).
5. If DDI_PROP_DONTPASS is not set, pass this request to the parent
device information node of the device represented by the layered
handle.
6. Return 0 if not found and 1 if found.
Typically, the specific dev_t value associated with the device repre‐
sented by the layered handle (ldi_handle_t) is used as a part of the
property match criteria. This association is handled by the layered
driver infrastructure on behalf of the consumers of the ldi property
look up functions.
However, if the LDI_DEV_T_ANY flag is used, the ldi property lookup
functions will match the request regardless of the dev_t value associ‐
ated with the property at the time of its creation. If a property was
created with a dev_t set to DDI_DEV_T_NONE, the only way to look up
this property is with the LDI_DEV_T_ANY flag. PROM properties are
always created with a dev_t set to DDI_DEV_T_NONE.
name must always be set to the name of the property being looked up.
RETURN VALUESldi_prop_exists() returns 1 if the property exists and 0 otherwise.
CONTEXT
This function may be called from user or kernel context.
EXAMPLE
The following example demonstrates the use of ldi_prop_exists().
/* Determine the existence of the "interrupts" property */
ldi_prop_exists(lh, LDI_DEV_T_ANY|DDI_PROP_NOTPROM, "interrupts");
SEE ALSOddi_prop_exists(9F)
Writing Device Drivers
SunOS 5.10 3 June 2003 ldi_prop_exists(9F)
