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Status code csCode 43 (0x2B) is defined as DriverGestalt. It takes two parameters, at csParam and csParam +4, that contain a gestalt-like selector and long word output. Similarly, control csCode 43 is defined as DriverConfigure. It also takes two parameters, an OSType selector that specifies the requested operation and a long word. The parameter blocks have these structures:
struct DriverGestaltParam {
QElemPtr qLink;
short qType;
short ioTrap;
Ptr ioCmdAddr;
ProcPtr ioCompletion;
OSErr ioResult;
StringPtr ioNamePtr;
short ioVRefNum;
short ioCRefNum; /* refNum for I/O operation*/
short csCode; /* == kDriverGestaltCode */
OSType driverGestaltSelector;
UInt32 driverGestaltResponse; /* Could be a */
/* pointer, bit field or */
/* other format */
UInt32 driverGestaltResponse1; /* Could be a */
/* pointer, bit field or */
/* other format */
UInt32 driverGestaltResponse2; /* Could be a */
/* pointer, bit field or */
/* other format */
UInt32 driverGestaltResponse3; /* Could be a */
/* pointer, bit field or */
/* other format */
UInt16 driverGestaltfiller; /* To pad out to the */
/* size of a controlPB */
};
struct DriverConfigParam {
QElemPtr qLink;
short qType;
short ioTrap;
Ptr ioCmdAddr;
IOCompletionUPP ioCompletion;
OSErr ioResult;
StringPtr ioNamePtr;
short ioVRefNum;
short ioCRefNum; /* refNum for I/O operation*/
short csCode; /* == driverConfigureCode*/
OSType driverConfigureSelector;
UInt32 driverConfigureParameter;
};
The OSType selectors for DriverGestalt and DriverConfigure are defined according to the rules of gestalt selector definition set forth in Inside Macintosh: Operating System Utilities. In particular, Apple reserves all four-character sequences consisting entirely of lowercase letters and nonalphabetic characters.