C++ IOServiceGetMatchingServices函数代码示例

// static
void QextSerialEnumerator::scanPortsOSX(QList<QextPortInfo> & infoList)
{
    io_iterator_t serialPortIterator = 0;
    kern_return_t kernResult = KERN_FAILURE;
    CFMutableDictionaryRef matchingDictionary;

    // first try to get any serialbsd devices, then try any USBCDC devices
    if( !(matchingDictionary = IOServiceMatching(kIOSerialBSDServiceValue) ) ) {
        qWarning("IOServiceMatching returned a NULL dictionary.");
        return;
    }
    CFDictionaryAddValue(matchingDictionary, CFSTR(kIOSerialBSDTypeKey), CFSTR(kIOSerialBSDAllTypes));

    // then create the iterator with all the matching devices
    if( IOServiceGetMatchingServices(kIOMasterPortDefault, matchingDictionary, &serialPortIterator) != KERN_SUCCESS ) {
        qCritical() << "IOServiceGetMatchingServices failed, returned" << kernResult;
        return;
    }
    iterateServicesOSX(serialPortIterator, infoList);
    IOObjectRelease(serialPortIterator);
    serialPortIterator = 0;

    if( !(matchingDictionary = IOServiceNameMatching("AppleUSBCDC")) ) {
        qWarning("IOServiceNameMatching returned a NULL dictionary.");
        return;
    }

    if( IOServiceGetMatchingServices(kIOMasterPortDefault, matchingDictionary, &serialPortIterator) != KERN_SUCCESS ) {
        qCritical() << "IOServiceGetMatchingServices failed, returned" << kernResult;
        return;
    }
    iterateServicesOSX(serialPortIterator, infoList);
    IOObjectRelease(serialPortIterator);
}

static kern_return_t createSerialIterator(io_iterator_t *serialIterator)
{
    kern_return_t   kernResult;
    mach_port_t     masterPort;
    CFMutableDictionaryRef  classesToMatch;

    if ((kernResult = IOMasterPort(0, &masterPort)) != KERN_SUCCESS)
    {
        printf("IOMasterPort returned %d\n", kernResult);
        return kernResult;
    }

    if ((classesToMatch = IOServiceMatching(kIOSerialBSDServiceValue)) == NULL)
    {
        printf("IOServiceMatching returned NULL\n");
        return kernResult;
    }

    CFDictionarySetValue(classesToMatch, CFSTR(kIOSerialBSDTypeKey),CFSTR(kIOSerialBSDAllTypes));
    kernResult = IOServiceGetMatchingServices(masterPort, classesToMatch, serialIterator);
    if (kernResult != KERN_SUCCESS)
    {
        printf("IOServiceGetMatchingServices returned %d\n", kernResult);
    }

    return kernResult;
}

kern_return_t SMCOpen(io_connect_t *conn, const char *serviceName)
{
    kern_return_t result;
    mach_port_t   masterPort;
    io_iterator_t iterator;
    io_object_t   device;

    IOMasterPort(MACH_PORT_NULL, &masterPort);

    CFMutableDictionaryRef matchingDictionary = IOServiceMatching(serviceName);
    result = IOServiceGetMatchingServices(masterPort, matchingDictionary, &iterator);
    if (result != kIOReturnSuccess)
    {
        //printf("Error: IOServiceGetMatchingServices() = %08x\n", result);
        return 1;
    }

    device = IOIteratorNext(iterator);
    IOObjectRelease((io_object_t)iterator);
    if (device == 0)
    {
        //printf("Error: no SMC found\n");
        return 1;
    }

    result = IOServiceOpen(device, mach_task_self(), 0, conn);
    IOObjectRelease(device);
    if (result != kIOReturnSuccess)
    {
        //printf("Error: IOServiceOpen() = %08x\n", result);
        return 1;
    }

    return kIOReturnSuccess;
}

static int
getstats(void)
{
    time_t                 now;
    io_iterator_t          drivelist;
    io_registry_entry_t    drive;
    CFMutableDictionaryRef match;
    kern_return_t          status;

    now = time(NULL);	/* register current time and check wether cache can be used */
    if (cache_time + CACHE_TIMEOUT > now) {
        return 0;
    }

    /*  Retrieve a list of drives. */
    match = IOServiceMatching("IOMedia");
    CFDictionaryAddValue(match, CFSTR(kIOMediaWholeKey), kCFBooleanTrue);
    status = IOServiceGetMatchingServices(masterPort, match, &drivelist);
    if (status != KERN_SUCCESS) {
	snmp_log(LOG_ERR, "diskio: couldn't match whole IOMedia devices\n");
/*	fprintf(stderr,"Couldn't match whole IOMedia devices\n"); */
	return(1);
    }

    num_drives = 0;  /* NB: Incremented by handle_drive */
    while ((drive = IOIteratorNext(drivelist)) && (num_drives < MAXDRIVES)) {
	handle_drive(drive, &drivestat[num_drives]);
	IOObjectRelease(drive);
    }
    IOObjectRelease(drivelist);

    cache_time = now;
    return (0);
}

void
serial_enumerate_device_names (serial_enumerate_device_names_callback *callback) {
    io_object_t serialPort;
    io_iterator_t serialPortIterator;

// ask for all the serial ports
    IOServiceGetMatchingServices(kIOMasterPortDefault,
       IOServiceMatching(kIOSerialBSDServiceValue),
       &serialPortIterator);

// loop through all the serial ports and add them to the array
    while ((serialPort = IOIteratorNext(serialPortIterator))) {
        CFStringRef string = IORegistryEntryCreateCFProperty(serialPort, CFSTR(kIOCalloutDeviceKey),  kCFAllocatorDefault, 0);
        CFIndex length = CFStringGetLength(string);
        CFIndex maxSize = CFStringGetMaximumSizeForEncoding(length, kCFStringEncodingUTF8);
        char *buffer = (char *)malloc(maxSize);
        if (CFStringGetCString(string, buffer, maxSize, kCFStringEncodingUTF8)) {
            callback(buffer);
        }
        free(buffer);
        CFRelease(string);
        IOObjectRelease(serialPort);
    }

    IOObjectRelease(serialPortIterator);
}

/**
 * Given a BSD device node name, guess its media type
 */
MythMediaType MediaTypeForBSDName(const char *bsdName)
{
    CFMutableDictionaryRef  matchingDict;
    kern_return_t           kernResult;
    io_iterator_t           iter;
    io_service_t            service;
    QString                 msg = QString("MediaTypeForBSDName(%1)")
                                  .arg(bsdName);
    MythMediaType           mediaType;


    if (!bsdName || !*bsdName)
    {
        LOG(VB_GENERAL, LOG_ALERT, msg + " - No name supplied?");
        return MEDIATYPE_UNKNOWN;
    }

    matchingDict = IOBSDNameMatching(sMasterPort, 0, bsdName);
    if (!matchingDict)
    {
        LOG(VB_GENERAL, LOG_ALERT, 
                 msg + " - IOBSDNameMatching() returned a NULL dictionary.");
        return MEDIATYPE_UNKNOWN;
    }

    // Return an iterator across all objects with the matching
    // BSD node name. Note that there should only be one match!
    kernResult = IOServiceGetMatchingServices(sMasterPort, matchingDict, &iter);

    if (KERN_SUCCESS != kernResult)
    {
        LOG(VB_GENERAL, LOG_ALERT,
                 QString(msg + " - IOServiceGetMatchingServices() returned %2")
                         .arg(kernResult));
        return MEDIATYPE_UNKNOWN;
    }
    if (!iter)
    {
        LOG(VB_GENERAL, LOG_ALERT,
                 msg + " - IOServiceGetMatchingServices() returned a NULL "
                       "iterator");
        return MEDIATYPE_UNKNOWN;
    }

    service = IOIteratorNext(iter);

    // Release this now because we only expect
    // the iterator to contain a single io_service_t.
    IOObjectRelease(iter);

    if (!service)
    {
        LOG(VB_GENERAL, LOG_ALERT, 
                 msg + " - IOIteratorNext() returned a NULL iterator");
        return MEDIATYPE_UNKNOWN;
    }
    mediaType = FindMediaType(service);
    IOObjectRelease(service);
    return mediaType;
}

bool isComputerIdle(int idle_secs)
{
    int64_t os_idle_secs = 0;
    io_iterator_t iter = 0;
    if (IOServiceGetMatchingServices(kIOMasterPortDefault, 
                                     IOServiceMatching("IOHIDSystem"), 
                                     &iter) == KERN_SUCCESS)
    {
        io_registry_entry_t entry = IOIteratorNext(iter);
        if (entry)
        {
            CFMutableDictionaryRef dict = NULL;
            if (IORegistryEntryCreateCFProperties(entry, &dict, 
                                                  kCFAllocatorDefault, 
                                                  0) == KERN_SUCCESS)
            {
                CFNumberRef obj = static_cast<CFNumberRef>
                (CFDictionaryGetValue(dict, 
                                      CFSTR("HIDIdleTime")));
                if (obj)
                {
                    int64_t nanoseconds = 0;
                    if (CFNumberGetValue(obj, kCFNumberSInt64Type, 
                                         &nanoseconds))
                    {
// Divide by 10^9 to convert from nanoseconds to seconds.
                        os_idle_secs = (nanoseconds >> 30); 
                    }
                }
            }

CFArrayRef getSerialModemList() {
    uint32_t serialModemCount = 0;
    CFMutableArrayRef devicePaths = CFArrayCreateMutable(kCFAllocatorDefault, serialModemCount, &kCFTypeArrayCallBacks);
    
    kern_return_t kernalReturnValue;
    
    CFMutableDictionaryRef deviceMatchingDictionary = NULL;
    deviceMatchingDictionary = IOServiceMatching(kIOSerialBSDServiceValue);
    io_iterator_t deviceIterator;
    kernalReturnValue = IOServiceGetMatchingServices(kIOMasterPortDefault, deviceMatchingDictionary,
                                                     &deviceIterator);
    if (kernalReturnValue != KERN_SUCCESS) {
        return NULL;
    }
    
    io_service_t device;
    while ((device = IOIteratorNext(deviceIterator)))
    {
        CFMutableDictionaryRef deviceProperties = NULL;
        kernalReturnValue = IORegistryEntryCreateCFProperties(device, &deviceProperties, kCFAllocatorDefault, kNilOptions);
        if (kernalReturnValue != KERN_SUCCESS) {
            return NULL;
        }
        
        CFStringRef devicePathKey = CFStringCreateWithCString(kCFAllocatorDefault, kIOCalloutDeviceKey, kCFStringEncodingASCII);
        CFStringRef devicePath = CFDictionaryGetValue(deviceProperties, devicePathKey);
        IOObjectRelease(device);
        CFArrayAppendValue(devicePaths, devicePath);
    }
    
    IOObjectRelease(deviceIterator);
    return CFArrayCreateCopy(kCFAllocatorDefault, devicePaths);
}

// This function is much inspired by record_all_devices() from
// http://opensource.apple.com/source/system_cmds/system_cmds-230/iostat.tproj/iostat.c
static void measureIoLoad(meter_sysload_t *load) {
  dynamic_accumulator_t *ioLoad = (dynamic_accumulator_t*)load->user;
  dynamic_accumulator_startReporting(ioLoad);
  
  // For all devices..
  io_iterator_t drivelist;
  io_registry_entry_t drive;
  CFMutableDictionaryRef match;
  kern_return_t status;
  
  // Get an iterator for IOMedia objects.
  match = IOServiceMatching("IOMedia");
  CFDictionaryAddValue(match, CFSTR(kIOMediaWholeKey), kCFBooleanTrue);
  status = IOServiceGetMatchingServices(masterPort, match, &drivelist);
  assert(status == KERN_SUCCESS);
  
  // Scan all of the IOMedia objects, report each object that has a parent
  // IOBlockStorageDriver
  while ((drive = IOIteratorNext(drivelist))) {
    reportDrive(ioLoad, drive);
    
    IOObjectRelease(drive);
  }
  IOObjectRelease(drivelist);
  
  load->ioLoad = dynamic_accumulator_getLoadPercentage(ioLoad);
}

int
main(void)
{
    kern_return_t          kr;
    io_iterator_t          io_hw_sensors;
    io_service_t           io_hw_sensor;
    CFMutableDictionaryRef sensor_properties;
    CFStringEncoding       systemEncoding = CFStringGetSystemEncoding();
   
    kr = IOServiceGetMatchingServices(kIOMasterPortDefault,
             IOServiceNameMatching("IOHWSensor"), &io_hw_sensors);
   
    while ((io_hw_sensor = IOIteratorNext(io_hw_sensors))) {
        kr = IORegistryEntryCreateCFProperties(io_hw_sensor, &sensor_properties,
                 kCFAllocatorDefault, kNilOptions);
        if (kr == KERN_SUCCESS)
            printTemperatureSensor(sensor_properties, systemEncoding);
   
        CFRelease(sensor_properties);
        IOObjectRelease(io_hw_sensor);
    }
   
    IOObjectRelease(io_hw_sensors);
   
    exit(kr);
}

io_connect_t open_and_connect_user_client(char* service_name, int type) {
    kern_return_t err;
    io_connect_t conn = MACH_PORT_NULL;
    
    CFMutableDictionaryRef matching = IOServiceMatching("IOGraphicsAccelerator2");
    if(!matching){
        printf("unable to create service matching dictionary\n");
        return conn;
    }
    
    io_iterator_t iterator;
    err = IOServiceGetMatchingServices(kIOMasterPortDefault, matching, &iterator);
    if (err != KERN_SUCCESS){
        printf("no matches\n");
        return conn;
    }
    
    io_service_t service = IOIteratorNext(iterator);
    
    if (service == IO_OBJECT_NULL){
        printf("unable to find service\n");
        return conn;
    }
    printf("got service: %x\n", service);
    
    
    err = IOServiceOpen(service, mach_task_self(), type, &conn);
    if (err != KERN_SUCCESS){
        printf("unable to get user client connection\n");
        return MACH_PORT_NULL;
    }
    //getchar();
    printf("got userclient connection: %x\n", conn);
    return conn;
}

IOReturn darwin_get_service_from_location_id ( unsigned int location_id, io_service_t *service )
{
	io_iterator_t deviceIterator;
	unsigned int found_location_id;

	CFMutableDictionaryRef matchingDict = IOServiceMatching(kIOUSBDeviceClassName);

	if (!matchingDict)
		return kIOReturnError;

	IOServiceGetMatchingServices(kIOMasterPortDefault, matchingDict, &deviceIterator);

	while ((*service = IOIteratorNext (deviceIterator))) {
		/* get the location from the i/o registry */

		found_location_id = GetLocationID(*service);

		if (location_id == found_location_id) {
		  found_location_id = GetLocationID(*service);
		  IOObjectRelease(deviceIterator);
		  return kIOReturnSuccess;
		}
	}
	/* not found, shouldn't happen */
	IOObjectRelease(deviceIterator);
	return kIOReturnError;
}

// Returns an iterator containing the primary (built-in) Ethernet interface. The caller is responsible for
// releasing the iterator after the caller is done with it.
static kern_return_t FindEthernetInterfaces(io_iterator_t *matchingServices, char* interfaceName)
{
    kern_return_t    kernResult;
    CFMutableDictionaryRef  matchingDict;
    //CFMutableDictionaryRef  propertyMatchDict;

    // Ethernet interfaces are instances of class kIOEthernetInterfaceClass.
    // IOServiceMatching is a convenience function to create a dictionary with the key kIOProviderClassKey and
    // the specified value.
  // Note by mike: we're not using this method and then filtering by kIOPropertyMatchKey anymore,
  // because that way we were getting authorization errors for some people for whom, for whatever reason,
  // kIOPropertyMatchKey was not TRUE for their en0 interface
    //matchingDict = IOServiceMatching(kIOEthernetInterfaceClass);

    matchingDict = IOBSDNameMatching(kIOMasterPortDefault, 0, interfaceName);

    if (NULL == matchingDict) {
      printf("IOBSDNameMatching returned a NULL dictionary.\n");
    }

    // IOServiceGetMatchingServices retains the returned iterator, so release the iterator when we're done with it.
    // IOServiceGetMatchingServices also consumes a reference on the matching dictionary so we don't need to release
    // the dictionary explicitly.
    kernResult = IOServiceGetMatchingServices(kIOMasterPortDefault, matchingDict, matchingServices);
    if (KERN_SUCCESS != kernResult) {
        printf("IOServiceGetMatchingServices returned 0x%08x\n", kernResult);
    }

    return kernResult;
}

 kern_return_t 
 CPUTemp::SMCOpen(void)
 {
     kern_return_t result;
     io_iterator_t iterator;
     io_object_t   device;
 
     CFMutableDictionaryRef matchingDictionary = IOServiceMatching("AppleSMC");
     result = IOServiceGetMatchingServices(kIOMasterPortDefault, matchingDictionary, &iterator);
     if (result != kIOReturnSuccess)
     {
         printf("Error: IOServiceGetMatchingServices() = %08x\n", result);
         return 1;
     }
 
     device = IOIteratorNext(iterator);
     IOObjectRelease(iterator);
     if (device == 0)
     {
         printf("Error: no SMC found\n");
         return 1;
     }
 
     result = IOServiceOpen(device, mach_task_self(), 0, &conn);
     IOObjectRelease(device);
     if (result != kIOReturnSuccess)
     {
         printf("Error: IOServiceOpen() = %08x\n", result);
         return 1;
     }
 
     return kIOReturnSuccess;
 }

int inputopen(usbdevice* kb){
    // Open master port (if not done yet)
    static mach_port_t master = 0;
    kern_return_t res;
    if(!master&& (res = IOMasterPort(bootstrap_port, &master)) != KERN_SUCCESS){
        master = 0;
        printf("Unable to open master port: 0x%08x\n", res);
        return 0;
    }
    // Open an HID service
    io_iterator_t iter;
    if((res = IOServiceGetMatchingServices(master, IOServiceMatching(kIOHIDSystemClass), &iter)) != KERN_SUCCESS){
        printf("Unable to get input service iterator: 0x%08x\n", res);
        return 0;
    }
    if((res = IOServiceOpen(IOIteratorNext(iter), mach_task_self(), kIOHIDParamConnectType, &kb->event)) != KERN_SUCCESS){
        IOObjectRelease(iter);
        printf("Unable to open IO service: 0x%08x\n", res);
        kb->event = 0;
        return 0;
    }
    IOObjectRelease(iter);
    clearkeys(kb);
    return 1;
}