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IOStreamShared.h

Includes:

Overview

IOStream definitions shared between kernel and user space.

Typedefs

IOStreamBufferID

typedef UInt32 IOStreamBufferID;

Structs and Unions

IOStreamBufferQueue

struct IOStreamBufferQueue { 
    UInt32 entryCount; 
    volatile UInt32 headIndex; 
    volatile UInt32 tailIndex; 
    UInt32 reserved; 
    IOStreamBufferQueueEntry queue[0]; 
};

Fields

entryCount: The number of queue entries in the queue.
headIndex: The index of the next queue slot that will be filled in by the queue writer.
tailIndex: The index of the next queue slot that can be read by the queue reader.
reserved: Reserved for future use.
queue: The array of queue entries.

IOStreamBufferQueueEntry

struct IOStreamBufferQueueEntry { 
    IOStreamBufferID bufferID; 
    UInt32 dataOffset; 
    UInt32 dataLength; 
    UInt32 controlOffset; 
    UInt32 controlLength; 
    UInt32 reserved[3]; 
};

Fields

bufferID: The ID of the buffer passed in this queue entry.
dataLength: The length of the valid data in the buffer.
reserved: Reserved for future use.

Enumerations

IOStream

enum { 
    kIOStreamOptionOpenExclusive = 0x00010000, 
    kIOStreamOptionOpenShared = 0x00020000 
};

Discussion

open options

Mach

Port types used with IOConnectSetNotificationPort().

enum { 
    kIOStreamPortTypeOutput, 
    kIOStreamPortTypeInput 
};

Constants

kIOStreamPortTypeOutput

kIOStreamPortTypeInput

Discussion

port types

Memory

Memory types used with IOConnectMapMemory().

enum { 
    kIOStreamMemoryTypeOutputQueue = 0x10000000, 
    kIOStreamMemoryTypeInputQueue = 0x20000000, 
    kIOStreamMemoryTypeBufferData = 0x30000000, 
    kIOStreamMemoryTypeBufferControl = 0x40000000, 
    kIOStreamBufferIDMask = 0x0FFFFFFF, 
    kIOStreamMemoryTypeMask = 0xF0000000 
};

Constants

kIOStreamMemoryTypeOutputQueue

kIOStreamMemoryTypeInputQueue

kIOStreamMemoryTypeBufferData

kIOStreamMemoryTypeBufferControl

kIOStreamBufferIDMask

kIOStreamMemoryTypeMask

Discussion

mapping types

User

Client method numbers used with IOConnectMethod...() functions.

enum { 
    kIOStreamMethodOpen, 
    kIOStreamMethodClose, 
    kIOStreamMethodStart, 
    kIOStreamMethodStop, 
    kIOStreamMethodSuspend, 
    kIOStreamMethodGetMode, 
    kIOStreamMethodSetMode, 
    kIOStreamMethodGetBufferCount 
};

Constants

kIOStreamMethodOpen

kIOStreamMethodClose

kIOStreamMethodStart

kIOStreamMethodStop

kIOStreamMethodSuspend

kIOStreamMethodGetMode

kIOStreamMethodSetMode

Discussion

client methods

User

Client trap numbers used with IOConnectTrap..() functions.

enum { 
    kIOStreamEnqueueInputTrap, 
    kIOStreamEnqueueInputSyncTrap 
};

Constants

kIOStreamEnqueueInputTrap

kIOStreamEnqueueInputSyncTrap

Discussion

client traps

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Last Updated: 2008-12-19