Copyright (C) 1994, Digital Equipment Corp.
UNSAFE MODULE Jv;
IMPORT Atom, AtomList, Ctypes, OSError, OSErrorPosix, Rd, Thread, Wr;
REVEAL
T = Public BRANDED OBJECT
rd: Rd.T;
wr: Wr.T;
OVERRIDES
init := Init;
close := Close;
END;
PROCEDURE Init (<*UNUSED*> t: T;
<*UNUSED*> pipeName: TEXT): T RAISES {OSError.E} =
(* open Unix domain connection to server. *)
BEGIN
OSErrorPosix.Raise();
RETURN NIL;
END Init;
PROCEDURE Close (t: T) =
BEGIN
TRY
Wr.Close(t.wr);
Rd.Close(t.rd);
EXCEPT
| Thread.Alerted, Wr.Failure, Rd.Failure => (* skip *)
END;
END Close;
-- send and receiving stuff, assume BYTESIZE(CHAR) = byte --
TYPE
LongArrayPtr =
UNTRACED REF
ARRAY [0 .. ((LAST(CARDINAL) DIV BITSIZE(CHAR)) - 1)] OF CHAR;
hack to get around type system. The horrible formula for the length of
the array gives the longest possible array
PROCEDURE Send (t: T; buf: ADDRESS; nbytes: CARDINAL)
RAISES {OSError.E, Thread.Alerted} =
BEGIN
TRY
WITH chars = LOOPHOLE(buf, LongArrayPtr) DO
Wr.PutString(t.wr, SUBARRAY(chars^, 0, nbytes));
END;
Wr.Flush(t.wr);
EXCEPT
| Wr.Failure (e) =>
RAISE OSError.E(AtomList.Cons(Atom.FromText("Write"), e));
END;
END Send;
PROCEDURE Recv (t: T; buf: ADDRESS; nbytes: CARDINAL)
RAISES {OSError.E, Thread.Alerted} =
VAR nchars: CARDINAL;
BEGIN
TRY
WITH chars = LOOPHOLE(buf, LongArrayPtr) DO
nchars := Rd.GetSub(t.rd, SUBARRAY(chars^, 0, nbytes));
END;
IF nchars < nbytes THEN
RAISE
OSError.E(AtomList.List2(ServerFailure, Atom.FromText("Read")));
END;
EXCEPT
| Rd.Failure (e) =>
RAISE OSError.E(AtomList.Cons(Atom.FromText("Read"), e));
END;
END Recv;
BEGIN
<* ASSERT BYTESIZE(CHAR) = BYTESIZE(Ctypes.char) *>
(* dumb consistency check *)
ServerFailure := Atom.FromText("Jv ServerFailure");
END Jv.