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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 pos‐
			    sible property match satisfies the matching crite‐
			    ria.

       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 plat‐
			    forms 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  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 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)
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