Definitions for "IOCTL"
Keywords:  pfx, irp, ipa, driver, vendor
I/O control code. A system-defined or vendor-defined control code that is used to identify I/O control operations. These control codes are contained in I/O request packets, if the IRP code is IRP_MJ_DEVICE_CONTROL or IRP_MJ_INTERNAL_DEVICE_CONTROL. For more information, see Using I/O Control Codes.
Control a character device. Character device drivers may include a "special function" entry point, pfx ioct().
An I/O control operation on a communication socket, e.g. to set an option on that socket.