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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 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) 2008 JRuby project 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 CPL, 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 CPL, the GPL or the LGPL. END LICENSE BLOCK ***
 import org.jruby.Ruby;
An IO implementation that reads/writes to a native file descriptor.
 @JRubyClass(name="FFI::" + ., parent="IO")
 public class FileDescriptorIO extends RubyIO {
     public static final String CLASS_NAME = "FileDescriptorIO";
     private static final class Allocator implements ObjectAllocator {
         public final IRubyObject allocate(Ruby runtimeRubyClass klass) {
             return new FileDescriptorIO(runtimeklass);
         private static final ObjectAllocator INSTANCE = new Allocator();
     public FileDescriptorIO(Ruby runtimeRubyClass klass) {
     public FileDescriptorIO(Ruby runtimeIRubyObject fd) {
         ModeFlags modes;
         try {
             modes = newModeFlags(runtime.);
             int fileno = RubyNumeric.fix2int(fd);
             jnr.posix.FileStat stat = runtime.getPosix().fstat(fileno);
             java.nio.channels.ByteChannel channel;
             if (stat.isSocket()) {
                 channel = new jnr.enxio.channels.NativeSocketChannel(fileno);
             } else if (stat.isBlockDev() || stat.isCharDev()) {
                 channel = new jnr.enxio.channels.NativeDeviceChannel(fileno);
             } else {
                 channel = new FileDescriptorByteChannel(runtimefileno);
             .setMainStream(, new ChannelDescriptor(channelmodes, FileDescriptorHelper.wrap(fileno))));
         } catch (BadDescriptorException e) {
             throw runtime.newErrnoEBADFError();
     public static RubyClass createFileDescriptorIOClass(Ruby runtimeRubyModule module) {
         RubyClass result = runtime.defineClassUnder(runtime.getClass("IO"),
         return result;
     @JRubyMethod(name = "new", meta = true)
     public static FileDescriptorIO newInstance(ThreadContext contextIRubyObject recvIRubyObject fd) {
        return new FileDescriptorIO(context.runtimefd);
    @JRubyMethod(name = "wrap", required = 1, meta = true)
    public static RubyIO wrap(ThreadContext contextIRubyObject recvIRubyObject fd) {
        return new FileDescriptorIO(context.runtimefd);
    static class FileDescriptorHelper {
        static {
            try {
                constructor =;
            } catch (Throwable t) {
                constructor = null;
             = constructor;
        public static wrap(int fileno) {
            try {
                return  != null ? .newInstance(fileno) : new;
            } catch (IllegalAccessException iae) {
                return new;
            } catch (InstantiationException ie) {
                return new;
            } catch (java.lang.reflect.InvocationTargetException ite) {
                return new;
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