Provides access to the graphics I/O (GIO) adapter.
The GIO special file is the application interface to the GIO adapter. The GIO special file provides applications with the ability to determine what I/O devices are attached to the GIO adapter.
Standard configuration methods are provided for the GIO special file. User configurable attributes for the GIO special file do not exist.
The open subroutine call specifying the GIO special file is processed normally except that the Oflag and Mode parameters are ignored. An open request is rejected if the special file is already opened or if a kernel extension attempts to open the GIO special file.
Calls to the read and write routines behave as if the call was made to the /dev/null file.
The GIO special file
supports the following functions with ioctls:
| IOCINFO | Returns the devinfo structure. |
| GIOQUERYID | Returns the identifier of device connected to the GIO adapter. |
The following error codes can be
found in the /usr/include/sys/errno.h file:
The GIO special file is part of Base Operating System (BOS) Runtime.
| /usr/include/sys/inputdd.h | Contains the ioctl commands. |
The close subroutine, ioctl subroutine, open subroutine, read subroutine, write subroutine.
The dials special file, lpfk special file.