DEVPOINTER 2 mux
NAME
devpointer - I/O interface for the pointer device
SYNOPSIS
.EX
include "draw.m"; # for Draw->Pointer
include "devpointer.m";
ptr:= load Devpointer Devpointer->PATH;
init: fn(file: string, posn: chan of ref Draw->Pointer): int;
bytes2ptr: fn(buf: array of byte) : ref Draw->Pointer;
ptr2bytes: fn(ptr: ref Draw->Pointer): array of byte;
DESCRIPTION
Devpointer reads messages from pointer devices with the same data format as
/dev/pointer , converting them to
Pointer adts.
Init spawns a process to read continually the pointer device specified by file and send a Pointer adts over the channel specified by posn . If file is nil , the default device is /dev/pointer .
Bytes2ptr converts the array of bytes buf to a Pointer and returns a reference to it. Buf should consist of exactly Devpointer->Size bytes and be in the format returned by /dev/pointer .
Ptr2bytes provides the inverse transformation of bytes2ptr : it packs the data into an array of bytes of appropriate format, which it returns.
FILES
/dev/pointer "SEE ALSO"
draw-intro (2), draw-pointer (2)