| /* SelectorProviderImpl.java -- |
| Copyright (C) 2002, 2003 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.java.nio; |
| |
| |
| import gnu.classpath.SystemProperties; |
| |
| import java.io.IOException; |
| import java.nio.channels.DatagramChannel; |
| import java.nio.channels.Pipe; |
| import java.nio.channels.ServerSocketChannel; |
| import java.nio.channels.SocketChannel; |
| import java.nio.channels.spi.AbstractSelector; |
| import java.nio.channels.spi.SelectorProvider; |
| |
| public class SelectorProviderImpl extends SelectorProvider |
| { |
| private static final String SELECTOR_IMPL_KQUEUE = "kqueue"; |
| private static final String SELECTOR_IMPL_EPOLL = "epoll"; |
| private static final String SELECTOR_IMPL = "gnu.java.nio.selectorImpl"; |
| private static boolean epoll_failed = false; |
| |
| public SelectorProviderImpl () |
| { |
| } |
| |
| public DatagramChannel openDatagramChannel () |
| throws IOException |
| { |
| return new DatagramChannelImpl (this); |
| } |
| |
| public Pipe openPipe () |
| throws IOException |
| { |
| return new PipeImpl (this); |
| } |
| |
| public AbstractSelector openSelector () |
| throws IOException |
| { |
| String selectorImpl = "default"; |
| if (KqueueSelectorImpl.kqueue_supported()) |
| selectorImpl = SELECTOR_IMPL_KQUEUE; |
| if (EpollSelectorImpl.epoll_supported() && !epoll_failed) |
| selectorImpl = SELECTOR_IMPL_EPOLL; |
| selectorImpl = SystemProperties.getProperty(SELECTOR_IMPL, selectorImpl); |
| |
| if (selectorImpl.equals(SELECTOR_IMPL_KQUEUE)) |
| return new KqueueSelectorImpl(this); |
| |
| if (selectorImpl.equals(SELECTOR_IMPL_EPOLL)) |
| { |
| // We jump through these hoops because even though epoll may look |
| // like it's available (sys/epoll.h exists, and you can link against |
| // all the epoll functions) it may not be available in the kernel |
| // (especially 2.4 kernels), meaning you will get ENOSYS at run time. |
| // |
| // Madness! |
| try |
| { |
| return new EpollSelectorImpl(this); |
| } |
| catch (InternalError e) |
| { |
| // epoll_create throws this on ENOSYS. |
| epoll_failed = true; |
| } |
| } |
| |
| return new SelectorImpl (this); |
| } |
| |
| public ServerSocketChannel openServerSocketChannel () |
| throws IOException |
| { |
| return new ServerSocketChannelImpl (this); |
| } |
| |
| public SocketChannel openSocketChannel () |
| throws IOException |
| { |
| return new SocketChannelImpl (this); |
| } |
| |
| } |