find element in ioregistry

from client program:


#include <IOKit/network/IOEthernetInterface.h>

#include <IOKit/IOType.h>

int findClassesInIoregistry(io_iterator_t*  iterator, char *match_name)

{

        CFDictionaryRef classToMatch;

kern_return_t kernResult; 

classToMatch = IOServiceMatching(match_name);

if (classToMatch == NULL)

        {

              return -1;

        }

// use class name to match

        kernResult = IOServiceGetMatchingServices(kIOMasterPortDefault,    
                      classToMatch, iterator);

if (kernResult != KERN_SUCCESS) 

        {

        

             return -1;

        }

return kIOReturnSuccess;

}

io_iterator_t ethernetInterfaceIterator;

result = findClassesInIoregistry(& ethernetInterfaceIterator, kIOEthernetInterfaceIterator);

if(result == kIOReturnSuccess)

{

        io_service_t ethernetInterface;

    while(ethernetInterface = IOIteratorNext(ethernetInterfaceIterator))

    {
        NSString *bsdName =
             (NSString*)IORegistryEntrySearchCFProperty(ethernetInterface,

                                                        kIOServicePlane, 

                                                        CFSTR("BSD Name"), 

                                                        kCFAllocatorDefault,

                                                   kIORegistryIterateRecursively);

       io_service_t ethernetController;

       result = IORegistryEntryGetParentEntry(ethernetInterface, 

                                           kIOServicePlane, 

                                           &ethernetController);

       if(result == kIOReturnSuccess)

       {

        

           IOObjectRelease(ethernetController);

       }

        IOObjectRelease(ethernetInterface);

        

    }

    IOObjectRelease(ethernetInterfaceIterator);

}

from driver program:

OSIterator *blockDriverIter =  this->getProviderIterator();

com_my_BlockStorageDriver *blockDriver;

if(blockDriverIter)

{

while (blockDriver = (com_my_BlockStorageDriver*)blockDriverIter->getNextObject()) 

        {

    

IOLog("blockDriver %p inAct %d\n", blockDriver,

blockDriver->isInactive());

   

}

blockDriverIter->release();

}