/***** BEGIN LICENSE BLOCK *****
 * Version: CPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Common 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/cpl-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.
 *
 * Copyright (C) 2007 Ola Bini <ola@ologix.com>
 * 
 * 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
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package org.jruby;

import jnr.constants.platform.Signal;
import org.jruby.anno.JRubyMethod;
import org.jruby.anno.JRubyModule;
import org.jruby.internal.runtime.ThreadService;
import org.jruby.javasupport.util.RuntimeHelpers;
import org.jruby.runtime.Block;
import org.jruby.runtime.BlockCallback;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.backtrace.BacktraceData;
import org.jruby.runtime.backtrace.TraceType.Gather;
import org.jruby.runtime.builtin.IRubyObject;

import org.jruby.util.SignalFacade;
import org.jruby.util.NoFunctionalitySignalFacade;

import java.util.Arrays;

@JRubyModule(name="Signal")
public class RubySignal {
    private final static SignalFacade SIGNALS = getSignalFacade();

    private final static SignalFacade getSignalFacade() {
        try {
            Class realFacadeClass = Class.forName("org.jruby.util.SunSignalFacade");
            return (SignalFacade)realFacadeClass.newInstance();
        } catch(Throwable e) {
            return new NoFunctionalitySignalFacade();
        }
    }
    
    public static void createSignal(Ruby runtime) {
        RubyModule mSignal = runtime.defineModule("Signal");
        
        mSignal.defineAnnotatedMethods(RubySignal.class);
        //registerThreadDumpSignalHandler(runtime);
    }
    
    @JRubyMethod(module = true)
    public static IRubyObject list(ThreadContext context, IRubyObject recv) {
        Ruby runtime = recv.getRuntime();
        RubyHash names = RubyHash.newHash(runtime);
        for (Signal s : Signal.values()) {
            if (!s.description().startsWith("SIG")) continue;

            // replace CLD with CHLD value
            long longValue = s.longValue();
            if (s == Signal.SIGCLD) longValue = Signal.SIGCHLD.longValue();

            // omit unsupported signals
            if (longValue >= 20000) continue;

            names.op_aset(context, runtime.newString(s.description().substring("SIG".length())), runtime.newFixnum(longValue));
        }
        names.op_aset(context, runtime.newString("EXIT"), runtime.newFixnum(0));
        return names;
    }

    @JRubyMethod(name = "__jtrap_kernel", required = 2, module = true)
    public static IRubyObject __jtrap_kernel(final IRubyObject recv, IRubyObject block, IRubyObject sig) {
        return SIGNALS.trap(recv, block, sig);
    }

    @JRubyMethod(name = "__jtrap_platform_kernel", required = 1, module = true)
    public static IRubyObject __jtrap_platform_kernel(final IRubyObject recv, IRubyObject sig) {
        return SIGNALS.restorePlatformDefault(recv, sig);
    }

    @JRubyMethod(name = "__jtrap_osdefault_kernel", required = 1, module = true)
    public static IRubyObject __jtrap_osdefault_kernel(final IRubyObject recv, IRubyObject sig) {
        return SIGNALS.restoreOSDefault(recv, sig);
    }

    @JRubyMethod(name = "__jtrap_ignore_kernel", required = 1, module = true)
    public static IRubyObject __jtrap_restore_kernel(final IRubyObject recv, IRubyObject sig) {
        return SIGNALS.ignore(recv, sig);
    }
}// RubySignal
