bind '#d' /dev /dev/draw/new /dev/draw/<n>/ctl /dev/draw/<n>/data /dev/draw/<n>/refresh
Each client of the device connects by opening /dev/draw/new and reading back seven decimal numbers in the standard 12-character format. The seven values are:
The ctl file accepts no messages; its only purpose is to return the initialization information.|
The data file accepts messages corresponding to procedures in the Draw module, such as:|
Allocate a window or image
Draw on the image.
Such messages generate data to be returned to the client which can be recovered by reading the data file. The format of the messages to and from the data file is described later.
As windows owned by the client are uncovered, they may not be refreshed by the server. For example, they could have refresh functions associated with them. In this case, the client is notified by a message refresh file reporting what needs to be repainted by the client. The message has five decimal integers formatted as in the ctl message: |
The image id of the window.
Four decimal values (min.x, min.y, max.x, and max.y) that define the display image in need of refreshment.