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IOKitLib.c
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IOKitLib.c
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/*
* Copyright (c) 1998-2012 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#ifndef IOCONNECT_MAPMEMORY_10_6
#define IOCONNECT_MAPMEMORY_10_6 1
#endif
#include <IOKit/IOTypes.h>
#include <device/device_types.h>
#include <mach/mach.h>
#include <mach/mach_port.h>
#include <stdlib.h>
#include <stdarg.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <unistd.h>
#include <asl.h>
#include <dispatch/dispatch.h>
#include <dispatch/private.h>
#include <CoreFoundation/CoreFoundation.h>
#include <CoreFoundation/CFMachPort.h>
#include <IOKit/IOBSD.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/IOKitServer.h>
#include <IOKit/IOCFSerialize.h>
#include <IOKit/IOCFUnserialize.h>
#include <IOKit/IOKitLibPrivate.h>
#if __LP64__
static const int kIsLP64 = 1;
typedef struct OSNotificationHeader64 NotificationHeader;
// XXX gvdl: Need to conditionalise this for LP64
#define mig_external __private_extern__
#include <iokitmig64.h>
#undef mig_external
#else
// To stage the IOKitUser map the 64 bit aware APIs locally
# if EMULATE_IOCONNECT
# define EMULATE_IOCONNECT_64 1
# define EMULATE_IOCONNECT_ASYNC_64 1
# endif
# if EMULATE_IOCONNECT_64
# define io_connect_method em_connect_method
# endif
# if EMULATE_IOCONNECT_ASYNC_64
# define io_connect_async_method em_connect_async_method
# endif
typedef struct OSNotificationHeader NotificationHeader;
static const int kIsLP64 = 0;
#include <iokitmig32.h>
#endif
/*
* Ports
*/
extern mach_port_t mach_task_self();
const mach_port_t kIOMasterPortDefault = MACH_PORT_NULL;
static mach_port_t
__IOGetDefaultMasterPort()
{
mach_port_t masterPort;
kern_return_t result = IOMasterPort(MACH_PORT_NULL, &masterPort);
if( KERN_SUCCESS != result)
masterPort = MACH_PORT_NULL;
return( masterPort );
}
kern_return_t
IOMasterPort( mach_port_t bootstrapPort __unused,
mach_port_t * masterPort )
{
kern_return_t result = KERN_SUCCESS;
mach_port_t host_port = 0;
host_port = mach_host_self();
result = host_get_io_master(host_port, masterPort);
/* Dispose of the host port to prevent security breaches and port
* leaks. We don't care about the kern_return_t value of this
* call for now as there's nothing we can do if it fails.
*/
if (host_port) mach_port_deallocate(mach_task_self(), host_port);
return result;
}
kern_return_t
IOCreateReceivePort( uint32_t msgType, mach_port_t * recvPort )
{
kern_return_t res;
switch (msgType) {
case kOSNotificationMessageID:
case kOSAsyncCompleteMessageID:
res = mach_port_allocate(mach_task_self(),
MACH_PORT_RIGHT_RECEIVE, recvPort);
break;
default:
res = kIOReturnBadArgument;
}
return res;
}
/*
* IOObject
*/
kern_return_t
IOObjectRelease(
io_object_t object )
{
return( mach_port_deallocate( mach_task_self(), object ));
}
kern_return_t
IOObjectRetain(
io_object_t object )
{
return( mach_port_mod_refs(mach_task_self(),
object,
MACH_PORT_RIGHT_SEND,
1 ));
}
kern_return_t
IOObjectGetClass(
io_object_t object,
io_name_t className )
{
return( io_object_get_class( object, className ));
}
CFStringRef
IOObjectCopyClass(io_object_t object)
{
io_name_t my_name;
CFStringRef my_str = NULL;
// if there's no argument, no point going on. Return NULL.
if (!object)
return my_str;
io_object_get_class( object, my_name );
my_str = CFStringCreateWithCString (kCFAllocatorDefault, my_name, kCFStringEncodingUTF8);
return my_str;
}
CFStringRef
IOObjectCopySuperclassForClass(CFStringRef classname)
{
io_name_t my_name, orig_name;
CFStringRef my_str = NULL;
char * my_cstr;
kern_return_t kr;
// if there's no argument, no point going on. Return NULL.
if (classname == NULL) {
return my_str;
}
my_cstr = malloc(sizeof(char) * 128);
CFStringGetCString (classname, my_cstr, 128, kCFStringEncodingUTF8);
strncpy(orig_name, my_cstr, sizeof(io_name_t));
mach_port_t masterPort = __IOGetDefaultMasterPort();
kr = io_object_get_superclass(masterPort, orig_name, my_name);
if (masterPort != MACH_PORT_NULL)
mach_port_deallocate(mach_task_self(), masterPort);
if (kr == kIOReturnSuccess) {
my_str = CFStringCreateWithCString (kCFAllocatorDefault, my_name, kCFStringEncodingUTF8);
}
free(my_cstr);
return my_str;
}
CFStringRef
IOObjectCopyBundleIdentifierForClass(CFStringRef classname)
{
io_name_t my_name, orig_name;
CFStringRef my_str = NULL;
char * my_cstr;
kern_return_t kr;
// if there's no argument, no point going on. Return NULL.
if (classname == NULL) {
return my_str;
}
my_cstr = malloc(sizeof(char) * 128);
CFStringGetCString (classname, my_cstr, 128, kCFStringEncodingUTF8);
strncpy(orig_name, my_cstr, sizeof(io_name_t));
mach_port_t masterPort = __IOGetDefaultMasterPort();
kr = io_object_get_bundle_identifier(masterPort, orig_name, my_name);
if (masterPort != MACH_PORT_NULL)
mach_port_deallocate(mach_task_self(), masterPort);
if (kr == kIOReturnSuccess) {
my_str = CFStringCreateWithCString (kCFAllocatorDefault, my_name, kCFStringEncodingUTF8);
}
free(my_cstr);
return my_str;
}
boolean_t
IOObjectConformsTo(
io_object_t object,
const io_name_t className )
{
boolean_t conforms;
if( kIOReturnSuccess != io_object_conforms_to(
object, (char *) className, &conforms ))
conforms = 0;
return( conforms );
}
boolean_t
IOObjectIsEqualTo(
io_object_t object,
io_object_t anObject )
{
return( object == anObject );
}
uint32_t
IOObjectGetKernelRetainCount(
io_object_t object )
{
uint32_t count;
if( kIOReturnSuccess != io_object_get_retain_count( object, &count))
count = 0;
return( count );
}
uint32_t
IOObjectGetRetainCount(
io_object_t object )
{
return( IOObjectGetKernelRetainCount(object) );
}
uint32_t
IOObjectGetUserRetainCount(
io_object_t object )
{
mach_port_urefs_t urefs;
if( kIOReturnSuccess != mach_port_get_refs( mach_task_self(), object, MACH_PORT_RIGHT_SEND, &urefs))
urefs = 0;
return( urefs );
}
/*
* IOIterator
*/
io_object_t
IOIteratorNext(
io_iterator_t iterator )
{
io_object_t next;
if( kIOReturnSuccess != io_iterator_next( iterator, &next))
next = 0;
return( next );
}
void
IOIteratorReset(
io_iterator_t iterator )
{
io_iterator_reset( iterator );
}
boolean_t
IOIteratorIsValid(
io_iterator_t iterator )
{
boolean_t valid;
if( kIOReturnSuccess != io_iterator_is_valid( iterator, &valid ))
valid = FALSE;
return( valid );
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* IOService
*/
io_service_t
IOServiceGetMatchingService(
mach_port_t _masterPort,
CFDictionaryRef matching )
{
kern_return_t kr;
CFDataRef data;
CFIndex dataLen;
mach_port_t masterPort;
io_service_t service = MACH_PORT_NULL;
if( !matching)
return( MACH_PORT_NULL);
data = IOCFSerialize( matching, kNilOptions );
CFRelease( matching );
if( !data)
return( MACH_PORT_NULL );
dataLen = CFDataGetLength(data);
if (MACH_PORT_NULL == _masterPort)
masterPort = __IOGetDefaultMasterPort();
else
masterPort = _masterPort;
if ((size_t) dataLen < sizeof(io_string_t))
kr = io_service_get_matching_service( masterPort,
(char *) CFDataGetBytePtr(data), &service );
else {
kern_return_t result;
kr = io_service_get_matching_service_ool( masterPort,
(char *) CFDataGetBytePtr(data), dataLen, &result, &service );
if (KERN_SUCCESS == kr)
kr = result;
}
CFRelease( data );
if ((masterPort != MACH_PORT_NULL) && (masterPort != _masterPort))
mach_port_deallocate(mach_task_self(), masterPort);
if (KERN_SUCCESS != kr)
service = MACH_PORT_NULL;
return( service );
}
kern_return_t
IOServiceGetMatchingServices(
mach_port_t _masterPort,
CFDictionaryRef matching,
io_iterator_t * existing )
{
kern_return_t kr;
CFDataRef data;
CFIndex dataLen;
mach_port_t masterPort;
if( !matching)
return( kIOReturnBadArgument);
data = IOCFSerialize( matching, kNilOptions );
CFRelease( matching );
if( !data)
return( kIOReturnUnsupported );
dataLen = CFDataGetLength(data);
if (MACH_PORT_NULL == _masterPort)
masterPort = __IOGetDefaultMasterPort();
else
masterPort = _masterPort;
if ((size_t) dataLen < sizeof(io_string_t))
kr = io_service_get_matching_services( masterPort,
(char *) CFDataGetBytePtr(data), existing );
else {
kern_return_t result;
kr = io_service_get_matching_services_ool( masterPort,
(char *) CFDataGetBytePtr(data), dataLen, &result, existing );
if (KERN_SUCCESS == kr)
kr = result;
}
CFRelease( data );
if ((masterPort != MACH_PORT_NULL) && (masterPort != _masterPort))
mach_port_deallocate(mach_task_self(), masterPort);
return( kr );
}
kern_return_t
IOServiceMatchPropertyTable( io_service_t service, CFDictionaryRef matching,
boolean_t * matches )
{
kern_return_t kr;
CFDataRef data;
CFIndex dataLen;
if( !matching)
return( kIOReturnBadArgument);
data = IOCFSerialize( matching, kNilOptions );
if( !data)
return( kIOReturnUnsupported );
dataLen = CFDataGetLength(data);
if ((size_t) dataLen < sizeof(io_string_t))
kr = io_service_match_property_table( service,
(char *) CFDataGetBytePtr(data), matches );
else {
kern_return_t result;
kr = io_service_match_property_table_ool( service,
(char *) CFDataGetBytePtr(data), dataLen, &result, matches );
if (KERN_SUCCESS == kr)
kr = result;
}
CFRelease( data );
return( kr );
}
kern_return_t
IOServiceAddNotification(
mach_port_t _masterPort,
const io_name_t notificationType,
CFDictionaryRef matching,
mach_port_t wakePort,
uintptr_t reference,
io_iterator_t *notification )
{
kern_return_t kr;
CFDataRef data;
CFIndex dataLen;
mach_port_t masterPort;
if( !matching)
return( kIOReturnBadArgument);
data = IOCFSerialize( matching, kNilOptions );
CFRelease( matching );
if( !data)
return( kIOReturnUnsupported );
dataLen = CFDataGetLength(data);
if (MACH_PORT_NULL == _masterPort)
masterPort = __IOGetDefaultMasterPort();
else
masterPort = _masterPort;
if ((size_t) dataLen < sizeof(io_string_t))
kr = io_service_add_notification( masterPort, (char *) notificationType,
(char *) CFDataGetBytePtr(data),
wakePort, (io_user_reference_t *) &reference, 1,
notification );
else {
kern_return_t result;
kr = io_service_add_notification_ool( masterPort, (char *) notificationType,
(char *) CFDataGetBytePtr(data), dataLen,
wakePort, (io_user_reference_t *) &reference, 1,
&result, notification );
if (KERN_SUCCESS == kr)
kr = result;
}
CFRelease( data );
if ((masterPort != MACH_PORT_NULL) && (masterPort != _masterPort))
mach_port_deallocate(mach_task_self(), masterPort);
return( kr );
}
kern_return_t
IOServiceAddMatchingNotification(
IONotificationPortRef notifyPort,
const io_name_t notificationType,
CFDictionaryRef matching,
IOServiceMatchingCallback callback,
void * refcon,
io_iterator_t * notification )
{
kern_return_t kr;
CFDataRef data;
CFIndex dataLen;
io_user_reference_t asyncRef[kIOMatchingCalloutCount];
if( !matching)
return( kIOReturnBadArgument);
data = IOCFSerialize( matching, kNilOptions );
CFRelease( matching );
if( !data)
return( kIOReturnUnsupported );
asyncRef[kIOMatchingCalloutFuncIndex] = (io_user_reference_t) callback;
asyncRef[kIOMatchingCalloutRefconIndex] = (io_user_reference_t) refcon;
dataLen = CFDataGetLength(data);
if ((size_t) dataLen < sizeof(io_string_t))
kr = io_service_add_notification( notifyPort->masterPort,
(char *) notificationType,
(char *) CFDataGetBytePtr(data),
notifyPort->wakePort,
asyncRef, kIOMatchingCalloutCount, notification );
else {
kern_return_t result;
kr = io_service_add_notification_ool( notifyPort->masterPort,
(char *) notificationType,
(char *) CFDataGetBytePtr(data), dataLen,
notifyPort->wakePort,
asyncRef, kIOMatchingCalloutCount, &result, notification );
if (KERN_SUCCESS == kr)
kr = result;
}
CFRelease( data );
return( kr );
}
kern_return_t
IOServiceAddInterestNotification(
IONotificationPortRef notifyPort,
io_service_t service,
const io_name_t interestType,
IOServiceInterestCallback callback,
void * refcon,
io_object_t * notification )
{
io_user_reference_t asyncRef[kIOInterestCalloutCount];
kern_return_t kr;
asyncRef[kIOInterestCalloutFuncIndex] = (io_user_reference_t) callback;
asyncRef[kIOInterestCalloutRefconIndex] = (io_user_reference_t) refcon;
asyncRef[kIOInterestCalloutServiceIndex] = (io_user_reference_t) service;
kr = io_service_add_interest_notification( service, (char *) interestType,
notifyPort->wakePort,
asyncRef, kIOInterestCalloutCount,
notification );
return( kr );
}
IONotificationPortRef
IONotificationPortCreate(
mach_port_t masterPort )
{
kern_return_t kr;
IONotificationPort *notify;
if (MACH_PORT_NULL == masterPort) {
masterPort = __IOGetDefaultMasterPort();
} else {
IOObjectRetain(masterPort);
}
notify = calloc( 1, sizeof( IONotificationPort));
if (!notify) {
return( 0 );
}
notify->masterPort = masterPort;
kr = IOCreateReceivePort(kOSNotificationMessageID, ¬ify->wakePort);
if( kr != kIOReturnSuccess) {
free( notify );
return( 0 );
}
return notify;
}
void
IONotificationPortDestroy(
IONotificationPortRef notify )
{
if (notify->cfmachPort) {
CFMachPortInvalidate(notify->cfmachPort);
CFRelease(notify->cfmachPort);
}
if( notify->source) {
CFRelease(notify->source);
}
if (notify->dispatchSource) {
dispatch_release(notify->dispatchSource);
}
mach_port_mod_refs(mach_task_self(), notify->wakePort,
MACH_PORT_RIGHT_RECEIVE, -1);
mach_port_deallocate(mach_task_self(), notify->masterPort);
free( notify );
}
CFRunLoopSourceRef
IONotificationPortGetRunLoopSource(
IONotificationPortRef notify )
{
CFMachPortContext context;
Boolean cfReusedPort = false;
if (notify->source)
return (notify->source);
context.version = 1;
context.info = (void *) notify;
context.retain = NULL;
context.release = NULL;
context.copyDescription = NULL;
notify->cfmachPort = CFMachPortCreateWithPort(NULL, notify->wakePort,
IODispatchCalloutFromCFMessage, &context, &cfReusedPort);
if (!notify->cfmachPort)
return NULL;
if (cfReusedPort)
{
// We got a CFMachPortRef that CF re-used from its pool.
// This is probably a race condition, and this belongs
// to a recently dead port.
// We expect a new CFMachPortRef - we treat it as an error.
CFStringRef description = NULL;
char str[255];
if (notify->cfmachPort) {
description = CFCopyDescription(notify->cfmachPort);
if (description) {
CFStringGetCString(description, str, sizeof(str), kCFStringEncodingUTF8);
CFRelease(description);
}
}
asl_log(NULL, NULL, ASL_LEVEL_ERR,
"IOKit.framework:IONotificationPortGetRunLoopSource bad CFMachPort, %s\n",
description ? str : "No Description");
CFRelease(notify->cfmachPort);
notify->cfmachPort = NULL;
goto exit;
}
notify->source = CFMachPortCreateRunLoopSource(NULL, notify->cfmachPort, 0);
exit:
return (notify->source);
}
mach_port_t
IONotificationPortGetMachPort(
IONotificationPortRef notify )
{
return( notify->wakePort );
}
boolean_t _IODispatchCalloutWithDispatch(mach_msg_header_t *msg, mach_msg_header_t *reply)
{
mig_reply_setup(msg, reply);
((mig_reply_error_t*)reply)->RetCode = MIG_NO_REPLY;
IODispatchCalloutFromCFMessage(NULL, msg, msg->msgh_size, dispatch_mach_msg_get_context(msg));
return TRUE;
}
#define MAX_MSG_SIZE (8ul * 1024ul - MAX_TRAILER_SIZE)
void
IONotificationPortSetDispatchQueue(IONotificationPortRef notify, dispatch_queue_t queue)
{
if (!queue) return;
if (notify->dispatchSource)
{
dispatch_release(notify->dispatchSource);
notify->dispatchSource = NULL;
}
notify->dispatchSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_MACH_RECV, notify->wakePort, 0, queue);
dispatch_source_set_event_handler(notify->dispatchSource, ^{
dispatch_mig_server(notify->dispatchSource, MAX_MSG_SIZE, _IODispatchCalloutWithDispatch);
});
/* Note: normally, dispatch sources for mach ports should destroy the underlying
* mach port in their cancellation handler. We take care to destroy the port
* after we destroy the source in IONotificationPortDestroy(), which gives us the
* flexibility of changing the queue used for the dispatch source.
*/
dispatch_resume(notify->dispatchSource);
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Matching creation helpers
*/
static CFMutableDictionaryRef
MakeOneStringProp(
CFStringRef key,
const char * name )
{
CFMutableDictionaryRef dict;
CFStringRef string;
dict = CFDictionaryCreateMutable( kCFAllocatorDefault, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
if( !dict)
return( dict);
string = CFStringCreateWithCString( kCFAllocatorDefault, name,
kCFStringEncodingMacRoman );
if( string) {
CFDictionarySetValue( dict, key, string );
CFRelease( string );
} else {
CFRelease( dict );
dict = 0;
}
return( dict );
}
static CFMutableDictionaryRef
MakeOneNumProp(
CFStringRef key,
uint64_t value )
{
CFMutableDictionaryRef dict;
CFNumberRef num;
dict = CFDictionaryCreateMutable( kCFAllocatorDefault, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
if( !dict)
return( dict);
num = CFNumberCreate( kCFAllocatorDefault, kCFNumberSInt64Type, &value );
if( num) {
CFDictionarySetValue( dict, key, num );
CFRelease( num );
} else {
CFRelease( dict );
dict = 0;
}
return( dict );
}
CFMutableDictionaryRef
IOServiceMatching(
const char * name )
{
return( MakeOneStringProp( CFSTR(kIOProviderClassKey), name ) );
}
CFMutableDictionaryRef
IOServiceNameMatching(
const char * name )
{
return( MakeOneStringProp( CFSTR(kIONameMatchKey), name ));
}
CFMutableDictionaryRef
IORegistryEntryIDMatching(
uint64_t entryID )
{
return( MakeOneNumProp( CFSTR(kIORegistryEntryIDKey), entryID ));
}
CFMutableDictionaryRef
IOBSDNameMatching(
mach_port_t masterPort __unused,
uint32_t options __unused,
const char * name )
{
if( !name)
return( 0 );
return( MakeOneStringProp( CFSTR(kIOBSDNameKey), name ));
}
CFMutableDictionaryRef
IOOpenFirmwarePathMatching(
mach_port_t masterPort __unused,
uint32_t options __unused,
const char * path )
{
io_string_t buf;
int maxLen;
char * comp;
int len;
maxLen = sizeof( io_string_t);
do {
len = strlen( kIODeviceTreePlane ":" );
maxLen -= len;
if( maxLen <= 0)
continue;
strlcpy( buf, kIODeviceTreePlane ":", len + 1 );
comp = buf + len;
len = strlen( path );
maxLen -= len;
if( maxLen <= 0)
continue;
strlcpy( comp, path, len + 1 );
return( MakeOneStringProp( CFSTR(kIOPathMatchKey), buf ));
} while( false );
return( 0 );
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
kern_return_t
OSGetNotificationFromMessage(
mach_msg_header_t *msg,
uint32_t index,
uint32_t *type,
uintptr_t *reference,
void **content,
vm_size_t *size )
{
// The kernel handles the downcast of the reference vector for 32bit tasks
NotificationHeader * header;
if( msg->msgh_id != kOSNotificationMessageID)
return( kIOReturnBadMessageID );
if( msg->msgh_size < (sizeof( mach_msg_header_t)
+ sizeof( NotificationHeader)))
return( kIOReturnNoResources );
if( index)
return( kIOReturnNoResources );
header = (NotificationHeader *) (msg + 1);
if( type)
*type = header->type;
if( reference)
*reference = (uintptr_t) header->reference[0];
if( size)
*size = header->size;
if( content) {
if( header->size)
*content = &header->content[0];
else
*content = 0;
}
return( kIOReturnSuccess );
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
void
IODispatchCalloutFromMessage(void *cfPort, mach_msg_header_t *msg, void *info)
{
return( IODispatchCalloutFromCFMessage( cfPort, msg, -1, info ));
}
void
IODispatchCalloutFromCFMessage(CFMachPortRef port __unused,
void *_msg, CFIndex size __unused, void *info __unused)
{
struct ComplexMsg {
mach_msg_header_t msgHdr;
mach_msg_body_t msgBody;
mach_msg_port_descriptor_t ports[1];
} * complexMsg = NULL;
mach_msg_header_t * msg = (mach_msg_header_t *)_msg;
NotificationHeader * header;
io_iterator_t notifier = MACH_PORT_NULL;
io_service_t service = MACH_PORT_NULL;
uint32_t leftOver;
boolean_t deliver = TRUE;
if( msg->msgh_id != kOSNotificationMessageID)
return;
if( MACH_MSGH_BITS_COMPLEX & msg->msgh_bits) {
complexMsg = (struct ComplexMsg *)_msg;
if( complexMsg->msgBody.msgh_descriptor_count)
service = complexMsg->ports[0].name;
header = (NotificationHeader *) &complexMsg->ports[complexMsg->msgBody.msgh_descriptor_count];
} else
header = (NotificationHeader *) (msg + 1);
leftOver = msg->msgh_size - (((vm_address_t) (header + 1)) - ((vm_address_t) msg));
// remote port is the notification (an iterator_t) that fired
notifier = msg->msgh_remote_port;
if( MACH_PORT_NULL != notifier) {
kern_return_t kr;
mach_port_urefs_t urefs;
kr = mach_port_get_refs( mach_task_self(), msg->msgh_remote_port, MACH_PORT_RIGHT_SEND, &urefs);
if( (KERN_SUCCESS != kr) || (urefs < 2)) {
// one ref carried by the message - < 2 means owner has released the notifier
deliver = false;
}
}
if(deliver)
{
switch( header->type )
{
case kIOAsyncCompletionNotificationType:
{
IOAsyncCompletionContent *asyncHdr;
asyncHdr = (IOAsyncCompletionContent *)(header + 1);
leftOver = (leftOver - sizeof(*asyncHdr)) / sizeof(void *);
void *func = (void *) header->reference[kIOAsyncCalloutFuncIndex];
void *refCon = (void *) header->reference[kIOAsyncCalloutRefconIndex];
switch (leftOver) {
case 0:
((IOAsyncCallback0) func)(refCon, asyncHdr->result);
break;
case 1:
((IOAsyncCallback1) func)(refCon, asyncHdr->result,
asyncHdr->args[0]);
break;