Provides access to the tablet.
The tablet special file is the application interface to the tablet. It provides the applications with the capability of receiving input from the tablet and it allows the application to change the sampling rate, dead zones, origin, resolution, and conversion mode.
There are no user commands to change the configuration of the tablet device. Applications may use ioctl commands to modify the configuration but these modifications are effective only until the tablet is closed.
The open subroutine call specifying the tablet special file is processed normally except that the Oflag and Mode parameters are ignored. The open request is rejected if the special file is already opened or if a kernel extension attempts to open the special file. All tablet inputs are flushed following an open subroutine call until an input ring is established. The tablet device is reset to the default configuration when an open request is made.
The tablet special file does not support the read or write subroutine calls. Instead, input data is obtained from the tablet through the input ring. The read and write subroutine calls behave the same as read or write subroutine calls to the /dev/null file.
The tablet special file
supports the following functions with ioctl subroutines:
The error codes can be found in
the /usr/include/sys/errno.h file.
The tablet special file is part of Base Operating System (BOS) Runtime.
| /usr/include/sys/inputdd.h | Contains declarations for ioctl commands and input ring report format. |
LFT Input Devices in AIX 5L Version 5.1 Kernel Extensions and Device Support Programming Concepts.
The close subroutine, ioctl subroutine, open subroutine, read subroutine, write subroutine.
The dials special file, GIO special file, kbd special file, lpfk special file, mouse special file.