different behaviors between Unix and Windows versions

[Bapst Frédéric]

Hi, 
 
We are trying to write an Eclipse plugin for Eclipse dedicated to GNU  prolog programming. In this context, I start GNU prolog as a separate  process, writing commands to the interpreter (e.g. compilations with  consult(...)), and reading the results (e.g. parsing error messages).  I'm working on Windows, so I set the LINEDIT environment variable to  "gui=no". 
 
It works for simple commands. But under Windows, there is a difference  in the behavior of gprolog between an interactive command-line and a  non-interactive process: when there is multiple answers, I get an  endless loop with this prompt: 
 
        Action (; for next solution, a for all solutions, RET to stop) ? 
 
while I do not send any character on the pipe. 
 
Any hint about that problem would be welcome. 
 
Here is a small Java program as an illustration of my problem. 
 
Note that the prob
 lem only happens on Windows; on Solaris, it works fine 
(but the "| ?-" prompt also disappears...why ?). 
 
Thanks in advance. 
 
-------------------------------------------------------------------------- 
--------------------  Java program 
-------------------------------------------------------------------------- 
import java.io.*; 
public class CallingProlog { 
static InputStreamReader fromProlog; 
static OutputStream      toProlog; 
// ---------------------------------------------------------------------- 
public static void main (String [] args) throws IOException{ 
  startProlog(); 
  while(true) { 
    if (fromProlog.ready()) {  // something to read from gprolog process 
      System.out.write( (char)(fromProlog.read())); 
      System.out.flush(); 
 &
 nbsp;  } 
    if (System.in.available()>0) { // something to read from stdin 
      toProlog.write((char)(System.in.read())); 
      toProlog.flush(); 
    } 
  } 
} 
// ---------------------------------------------------------------------- 
public static void startProlog() throws IOException { 
  String Cmd = "gprolog"; 
  Process prcss = Runtime.getRuntime().exec(Cmd); 
  fromProlog = new InputStreamReader(prcss.getInputStream()); 
  toProlog = prcss.getOutputStream(); 
} 
} 
 
-------------------------------------------------------------------------- 
--------------------  Execution 
-------------------------------------------------------------------------- 
E:\java CallingProlog 
GNU Prolog 1.2.16 
By Daniel Diaz 
Copyright (C) 1999-2002
  Daniel Diaz 
append([],A,[]). 
 
A = [] 
 
yes 
append(A,B,C). 
 
A = [] 
C = B ? 
Action (; for next solution, a for all solutions, RET to stop) ? 
Action (; for next solution, a for all solutions, RET to stop) ? 
Action (; for next solution, a for all solutions, RET to stop) ? 
...

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