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DoDriverIO Entry Point

Generic 'ndrv' drivers must provide a single code entry point DoDriverIO, which responds to kOpenCommand, kCloseCommand, kReadCommand, kWriteCommand, kControlCommand, kStatusCommand, kKillIOCommand, kInitializeCommand, kFinalizeCommand, kReplaceCommand, and kSupersededCommand commands.



 
OSErr DoDriverIO (

                     AddressSpaceID spaceID,

                     IOCommandID ID,

                     IOCommandContents contents,

                     IOCommandCode code,

                     IOCommandKind kind);



 
typedef KernelID AddressSpaceID;

spaceID: The address space containing the buffer to be prepared. Mac OS 7.5 and later provide only one address space (kCurrentAddressSpaceID ), which it automatically passes to native drivers.
ID: Command ID.
contents: An IOCommandContents I/O parameter block. Use the InitializationInfo union member when calling to initialize the driver, FinalizationInfo when removing the driver, DriverReplaceInfo when replacing, DriverSupersededInfo when superseding, and ParmBlkPtr for all other I/O actions.
code: Selector used to determine I/O actions.
kind: Options used to determine how I/O actions are performed. The bits in this field have these meanings:

Bit	Meaning
0	synchronous I/O
1	asynchronous I/O
2	immediate I/O

DoDriverIO Entry Point

DoDriverIO Parameter Data Structures

Sample Handler Framework