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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/nio/SelectorProviderImpl.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/nio/SelectorProviderImpl.java')
-rw-r--r-- | libjava/classpath/gnu/java/nio/SelectorProviderImpl.java | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/nio/SelectorProviderImpl.java b/libjava/classpath/gnu/java/nio/SelectorProviderImpl.java new file mode 100644 index 000000000..a205bbd61 --- /dev/null +++ b/libjava/classpath/gnu/java/nio/SelectorProviderImpl.java @@ -0,0 +1,121 @@ +/* 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); + } + +} |