ldi_prop_exists(9F)					   Kernel Functions for Drivers 				       ldi_prop_exists(9F)

NAME

       ldi_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 property  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.

DESCRIPTION

       ldi_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 associated with the layered handle, and the property name. This   association
       is handled by the layered driver infrastructure on behalf of the consumers 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 lay-
		  ered handle.

	   6.	  Return 0 if not found and 1 if found.

       Typically, the specific dev_t value associated with the device represented 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 VALUES

       ldi_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 ALSO

       ddi_prop_exists(9F)

       Writing Device Drivers

SunOS 5.11							    3 June 2003 					       ldi_prop_exists(9F)