jruby/src/org/jruby/util/SunSignalFacade.java at parallel_boot · MSNexploder/jruby · GitHub

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/***** BEGIN LICENSE BLOCK *****

* Version: EPL 1.0/GPL 2.0/LGPL 2.1

* The contents of this file are subject to the Eclipse Public

* License Version 1.0 (the "License"); you may not use this file

* except in compliance with the License. You may obtain a copy of

* the License at http://www.eclipse.org/legal/epl-v10.html

* Software distributed under the License is distributed on an "AS

* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or

* implied. See the License for the specific language governing

* rights and limitations under the License.

* Alternatively, the contents of this file may be used under the terms of

* either of the GNU General Public License Version 2 or later (the "GPL"),

* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),

* in which case the provisions of the GPL or the LGPL are applicable instead

* of those above. If you wish to allow use of your version of this file only

* under the terms of either the GPL or the LGPL, and not to allow others to

* use your version of this file under the terms of the EPL, indicate your

* decision by deleting the provisions above and replace them with the notice

* and other provisions required by the GPL or the LGPL. If you do not delete

* the provisions above, a recipient may use your version of this file under

* the terms of any one of the EPL, the GPL or the LGPL.

***** END LICENSE BLOCK *****/

package org.jruby.util;

import org.jruby.Ruby;

import org.jruby.RubyModule;

import org.jruby.RubyProc;

import org.jruby.exceptions.MainExitException;

import org.jruby.exceptions.RaiseException;

import org.jruby.runtime.builtin.IRubyObject;

import org.jruby.runtime.CallBlock;

import org.jruby.runtime.Arity;

import org.jruby.runtime.Block;

import org.jruby.runtime.BlockCallback;

import org.jruby.runtime.ThreadContext;

import sun.misc.Signal;

import sun.misc.SignalHandler;

import java.util.HashMap;

import java.util.Map;

/**

* @author <a href="mailto:ola.bini@gmail.com">Ola Bini</a>

public class SunSignalFacade implements SignalFacade {

/**

* Remembers the original signal handlers before JRuby started messing around with them,

* to emulate {@code Signal.trap(...,"DEFAULT")} that's supposed to restore the platform

* default handler.

private final Map<Signal,SignalHandler> original = new HashMap<Signal, SignalHandler>();

private final static class JRubySignalHandler implements SignalHandler {

private final Ruby runtime;

private final IRubyObject block;

private final String signal;

private final BlockCallback blockCallback;

public JRubySignalHandler(Ruby runtime, IRubyObject block, String signal) {

this(runtime, block, null, signal);

}

public JRubySignalHandler(Ruby runtime, BlockCallback callback, String signal) {

this(runtime, null, callback, signal);

}

private JRubySignalHandler(Ruby runtime, IRubyObject block, BlockCallback callback, String signal) {

this.runtime = runtime;

this.block = block;

this.blockCallback = callback;

this.signal = signal;

}

public void handle(Signal signal) {

ThreadContext context = runtime.getCurrentContext();

try {

if (block != null) {

block.callMethod(context, "call");

} else {

blockCallback.call(context, new IRubyObject[0], Block.NULL_BLOCK);

}

} catch(RaiseException e) {

try {

runtime.getThread().callMethod(context, "main")

.callMethod(context, "raise", e.getException());

} catch(Exception ignored) {}

} catch (MainExitException mee) {

runtime.getThreadService().getMainThread().kill();

} finally {

Signal.handle(new Signal(this.signal), this);

}

public IRubyObject trap(final IRubyObject recv, IRubyObject blk, IRubyObject sig) {

return trap(recv.getRuntime(), new JRubySignalHandler(recv.getRuntime(), blk, sig.toString()));

}

public IRubyObject trap(final Ruby runtime, BlockCallback blk, String sig) {

return trap(runtime, new JRubySignalHandler(runtime, blk, sig));

}

private IRubyObject trap(final Ruby runtime, final JRubySignalHandler handler) {

return trap(runtime,handler.signal,handler);

}

public IRubyObject restorePlatformDefault(IRubyObject recv, IRubyObject sig) {

SignalHandler handler;

synchronized (original) {

handler = original.get(new Signal(sig.toString()));

}

if (handler!=null)

return trap(recv.getRuntime(),sig.toString(),handler);

else {

// JRuby hasn't touched this signal handler, so it should be the platform default already

return recv.getRuntime().getNil();

}

public IRubyObject restoreOSDefault(IRubyObject recv, IRubyObject sig) {

return trap(recv.getRuntime(),sig.toString(),SignalHandler.SIG_DFL);

}

public IRubyObject ignore(IRubyObject recv, IRubyObject sig) {

return trap(recv.getRuntime(),sig.toString(),SignalHandler.SIG_IGN);

}

private IRubyObject trap(final Ruby runtime, final String signalName, final SignalHandler handler) {

final SignalHandler oldHandler;

final Signal signal;

try {

signal = new Signal(signalName);

} catch (Throwable e) {

return runtime.getNil();

}

try {

oldHandler = Signal.handle(signal, handler);

} catch (Exception e) {

throw runtime.newArgumentError(e.getMessage());

}

synchronized (original) {

if (!original.containsKey(signal))

original.put(signal,oldHandler);

}

BlockCallback callback = null;

if (oldHandler instanceof JRubySignalHandler) {

JRubySignalHandler jsHandler = (JRubySignalHandler) oldHandler;

if (jsHandler.blockCallback != null) {

callback = jsHandler.blockCallback;

} else {

return jsHandler.block;

}

if (callback == null) {

callback = new BlockCallback() {

public IRubyObject call(ThreadContext context, IRubyObject[] args, Block block) {

oldHandler.handle(signal);

return runtime.getNil();

}

};

}

final RubyModule signalModule = runtime.getModule("Signal");

Block block = CallBlock.newCallClosure(signalModule, signalModule, Arity.noArguments(),

callback, runtime.getCurrentContext());

return RubyProc.newProc(runtime, block, block.type);

}

}// SunSignalFacade

jruby/src/org/jruby/util/SunSignalFacade.java at parallel_boot · MSNexploder/jruby · GitHub

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