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IOService.h

See Also:	IORegistryEntry
Includes:	<IOKit/IORegistryEntry.h> <IOKit/IOReturn.h> <IOKit/IODeviceMemory.h> <IOKit/IONotifier.h> <IOKit/IOLocks.h> <IOKit/IOKitDebug.h> <IOKit/IOInterrupts.h> <IOKit/pwr_mgt/IOPMpowerState.h> <IOKit/IOServicePM.h> <kern/thread_call.h>

Overview

This header contains the definition of the IOService class. IOService is the sole direct subclass of IORegistryEntry and is the base class of almost all I/O Kit family superclasses. IOService defines methods that support the life cycle of I/O Kit drivers. For more information on IOService, see I/O Kit Fundamentals.

Classes

IOService: The base class for most I/O Kit families, devices, and drivers.

Typedefs

IOServiceInterestHandler

typedef IOReturn ( *IOServiceInterestHandler)(
    void *target,
    void *refCon, 
    UInt32 messageType,
    IOService *provider, 
    void *messageArgument,
    vm_size_t argSize );

Fields

target: Reference supplied when the notification was registered.
refCon: Reference constant supplied when the notification was registered.
messageType: Type of the message - IOKit defined in IOKit/IOMessage.h or family specific.
provider: The IOService object who is delivering the notification. It is retained for the duration of the handler's invocation and doesn't need to be released by the handler.
messageArgument: An argument for message, dependent on its type.
argSize: Non zero if the argument represents a struct of that size, used when delivering messages outside the kernel.

IOServiceNotificationHandler

typedef bool ( *IOServiceNotificationHandler)(
    void *target,
    void *refCon, 
    IOService *newService );

Fields

target: Reference supplied when the notification was registered.
refCon: Reference constant supplied when the notification was registered.
newService: The IOService object the notification is delivering. It is retained for the duration of the handler's invocation and doesn't need to be released by the handler.

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Last Updated: 2008-12-19