Open

Declaration

virtual kern_return_t Open(IOService *forClient, IOOptionBits options, uint8_t *arg);

Parameters

• forClient:

  The service object that is opening the session.

• options:

  The options to use when opening the session. Specify Kusbhostopenoptionselectalternatesetting to select an alternative setting for this interface immediately. Specify the alternative setting in the arg parameter.

• arg:

  Additional arguments to the function. If you specify Kusbhostopenoptionselectalternatesetting for the options parameter, use this value to specify the value for the alternative setting; otherwise, specify NULL.

Return Value

kIOReturnSuccess on success, or another value if an error occurs. See Error Codes.

Discussion

This method opens a session to the IOUSBHostInterface, and acquires the service’s workloop lock. Only one service at a time may open a session to the interface.

See Also

Managing the Device Session

• Close