jruby · Jan 26, 2016 · Jan 26, 2016 · Jan 26, 2016 · Jan 26, 2016 · Jan 26, 2016
diff --git a/core/src/main/java/org/jruby/util/cli/Options.java b/core/src/main/java/org/jruby/util/cli/Options.java
@@ -224,6 +224,7 @@ public class Options {
     public static final Option<Boolean> TRUFFLE_COVERAGE_GLOBAL = bool(TRUFFLE, "truffle.coverage.global", false, "Run coverage for all code and print results on exit.");
 
     public static final Option<String> TRUFFLE_CORE_LOAD_PATH = string(TRUFFLE, "truffle.core.load_path", "truffle:/jruby-truffle", "Location to load the Truffle core library from.");
+    public static final Option<Boolean> TRUFFLE_POSIX_USE_JAVA = bool(TRUFFLE, "truffle.posix.use_java", false, "Use a Java emulation of POSIX.");
 
     public static final Option<Integer> TRUFFLE_ARRAY_UNINITIALIZED_SIZE = integer(TRUFFLE, "truffle.array.uninitialized_size", 32, "How large an Array to allocate when we have no other information to go on.");
     public static final Option<Integer> TRUFFLE_ARRAY_SMALL = integer(TRUFFLE, "truffle.array.small", 3, "Maximum size of an Array to consider small for optimisations.");

diff --git a/truffle/src/main/java/org/jruby/truffle/runtime/BaseLibC.java b/truffle/src/main/java/org/jruby/truffle/runtime/BaseLibC.java
diff --git a/truffle/src/main/java/org/jruby/truffle/runtime/JavaLibC.java b/truffle/src/main/java/org/jruby/truffle/runtime/JavaLibC.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved. This
+ * code is released under a tri EPL/GPL/LGPL license. You can use it,
+ * redistribute it and/or modify it under the terms of the:
+ *
+ * Eclipse Public License version 1.0
+ * GNU General Public License version 2
+ * GNU Lesser General Public License version 2.1
+ */
+package org.jruby.truffle.runtime;
+
+import jnr.posix.LibC;
+
+public class JavaLibC extends BaseLibC implements LibC {
+
+    public static final JavaLibC INSTANCE = new JavaLibC();
+
+    private JavaLibC() {
+    }
+
+    @Override
+    public int isatty(int fd) {
+        return System.console() != null ? 1 : 0;
+    }
+}
diff --git a/truffle/src/main/java/org/jruby/truffle/runtime/Options.java b/truffle/src/main/java/org/jruby/truffle/runtime/Options.java
@@ -19,6 +19,7 @@ public class Options {
     // Resources
 
     public final String CORE_LOAD_PATH = org.jruby.util.cli.Options.TRUFFLE_CORE_LOAD_PATH.load();
+    public final boolean POSIX_USE_JAVA = org.jruby.util.cli.Options.TRUFFLE_POSIX_USE_JAVA.load();
 
     // Data structures
 

diff --git a/truffle/src/main/java/org/jruby/truffle/runtime/POSIXDelegator.java b/truffle/src/main/java/org/jruby/truffle/runtime/POSIXDelegator.java
diff --git a/truffle/src/main/java/org/jruby/truffle/runtime/RubyContext.java b/truffle/src/main/java/org/jruby/truffle/runtime/RubyContext.java
@@ -168,8 +168,11 @@ public RubyContext(Ruby runtime, TruffleLanguage.Env env) {
 
         this.runtime = runtime;
 
-        // JRuby+Truffle uses POSIX for all IO - we need the native version
-        posix = POSIXFactory.getNativePOSIX(new TrufflePOSIXHandler(this));
+        if (options.POSIX_USE_JAVA) {
+            posix = new TruffleJavaPOSIX(this, POSIXFactory.getJavaPOSIX(new TrufflePOSIXHandler(this)));
+        } else {
+            posix = POSIXFactory.getNativePOSIX(new TrufflePOSIXHandler(this));
+        }
 
         nativeSockets = LibraryLoader.create(NativeSockets.class).library("c").load();
 

diff --git a/truffle/src/main/java/org/jruby/truffle/runtime/TruffleJavaPOSIX.java b/truffle/src/main/java/org/jruby/truffle/runtime/TruffleJavaPOSIX.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved. This
+ * code is released under a tri EPL/GPL/LGPL license. You can use it,
+ * redistribute it and/or modify it under the terms of the:
+ *
+ * Eclipse Public License version 1.0
+ * GNU General Public License version 2
+ * GNU Lesser General Public License version 2.1
+ */
+package org.jruby.truffle.runtime;
+
+import jnr.constants.platform.Fcntl;
+import jnr.posix.LibC;
+import jnr.posix.POSIX;
+
+public class TruffleJavaPOSIX extends POSIXDelegator implements POSIX {
+
+    private final RubyContext context;
+
+    public TruffleJavaPOSIX(RubyContext context, POSIX delegateTo) {
+        super(delegateTo);
+        this.context = context;
+    }
+
+    @Override
+    public int fcntlInt(int fd, Fcntl fcntlConst, int arg) {
+        if (fcntlConst.longValue() == Fcntl.F_GETFL.longValue()) {
+            switch (fd) {
+                case 0:
+                case 1:
+                case 2:
+                    return 0;
+            }
+        }
+
+        return super.fcntlInt(fd, fcntlConst, arg);
+    }
+
+    @Override
+    public int getpid() {
+        return context.hashCode();
+    }
+
+    @Override
+    public LibC libc() {
+        return JavaLibC.INSTANCE;
+    }
+
+}