/*
	File:			SetPropertiesTestTool.c
	
	Description:	This sample demonstrates how to set up a simple interface to a custom kernel driver
					using I/O Registry properties. It works with the VendorSpecificType00 driver included
					with this sample.
                
	Copyright:		� Copyright 2002-2006 Apple Computer, Inc. All rights reserved.
	
	Disclaimer:		IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.
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					The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
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	Change History (most recent first):
        
            1.1		08/31/2006			Updated to produce a universal binary. Now requires Xcode 2.2.1 or
										later to build.

            1.0	 	08/15/2002			New sample.
        
*/

#include <CoreFoundation/CoreFoundation.h>
#include <IOKit/IOKitLib.h>

// IO_OBJECT_NULL was added in Mac OS X 10.4. If it's not defined in the headers, define it ourselves.
// This allows the same code to build using the 10.4.0 SDK for Intel-based systems and earlier SDKs for backwards compatibility
// with PowerPC-based systems.
#ifndef IO_OBJECT_NULL
#define	IO_OBJECT_NULL	((io_object_t) 0)
#endif

int main (int argc, const char *argv[])
{
    CFMutableDictionaryRef	dictRef;
    io_iterator_t			iter;
    io_service_t			service;
    kern_return_t			kr;
    CFNumberRef				numberRef;
    SInt32					constantOne = 1;
    
    // The bulk of this code locates all instances of our driver running on the system.
	
	// First find all children of our driver. As opposed to nubs, drivers are often not registered
	// via the registerServices call because nothing is expected to match to them. Unregistered
	// objects in the I/O Registry are not returned by IOServiceGetMatchingServices.
	
	// IOBlockStorageServices is our child in the I/O Registry
	dictRef = IOServiceMatching("IOBlockStorageServices"); 
    if (!dictRef) {
		fprintf(stderr, "IOServiceMatching returned NULL.\n");
        return -1;
    }
    
    // Create an iterator over all matching IOService nubs.
    // This consumes a reference on dictRef.
    kr = IOServiceGetMatchingServices(kIOMasterPortDefault, dictRef, &iter);
    if (KERN_SUCCESS != kr) {
		fprintf(stderr, "IOServiceGetMatchingServices returned 0x%08x.\n", kr);
		CFRelease(dictRef);
        return -1;
    }

    // Create a dictionary to pass to our driver. This dictionary has the key "MyProperty"
	// and the value an integer 1. 
    dictRef = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, 
                                        &kCFTypeDictionaryKeyCallBacks,
                                        &kCFTypeDictionaryValueCallBacks);
    
    numberRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &constantOne);    
    CFDictionarySetValue(dictRef, CFSTR("MyProperty"), numberRef);    
    CFRelease(numberRef);

    // Iterate across all instances of IOBlockStorageServices.
	while ((service = IOIteratorNext(iter))) {
        io_registry_entry_t parent;
        
        // Now that our child has been found we can traverse the I/O Registry to find our driver.
		kr = IORegistryEntryGetParentEntry(service, kIOServicePlane, &parent);
        if (KERN_SUCCESS != kr) {
			fprintf(stderr, "IORegistryEntryGetParentEntry returned 0x%08x.\n", kr);
        }
        else {
            // We're only interested in the parent object if it's our driver class.
			if (IOObjectConformsTo(parent, "com_apple_dts_driver_VendorSpecificType00")) {
                // This is the function that results in ::setProperties() being called in our
                // kernel driver. The dictionary we created is passed to the driver here.
                kr = IORegistryEntrySetCFProperties(parent, dictRef);
                if (KERN_SUCCESS != kr) {
					fprintf(stderr, "IORegistryEntrySetCFProperties returned 0x%08x.\n", kr);
                }
            }
            
            // Done with the parent object.
			IOObjectRelease(parent);
        }
        
        // Done with the object returned by the iterator.
		IOObjectRelease(service);
    }

    if (iter != IO_OBJECT_NULL) {
        IOObjectRelease(iter);
        iter = IO_OBJECT_NULL;
    }

    if (dictRef) {
        CFRelease(dictRef);
        dictRef = NULL;
    }
    
    return 0;
}