10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.nio.ch;
27
28 import java.io.FileDescriptor;
29 import java.io.IOException;
30 import java.nio.ByteBuffer;
31 import java.nio.MappedByteBuffer;
32 import java.nio.channels.ClosedByInterruptException;
33 import java.nio.channels.ClosedChannelException;
34 import java.nio.channels.FileChannel;
35 import java.nio.channels.FileLock;
36 import java.nio.channels.FileLockInterruptionException;
37 import java.nio.channels.NonReadableChannelException;
38 import java.nio.channels.NonWritableChannelException;
39 import java.nio.channels.OverlappingFileLockException;
40 import java.nio.channels.ReadableByteChannel;
41 import java.nio.channels.SelectableChannel;
42 import java.nio.channels.WritableByteChannel;
43 import java.security.AccessController;
44 import java.util.ArrayList;
45 import java.util.List;
46
47 import jdk.internal.misc.JavaIOFileDescriptorAccess;
48 import jdk.internal.misc.JavaNioAccess;
49 import jdk.internal.misc.SharedSecrets;
50 import jdk.internal.ref.Cleaner;
51 import sun.security.action.GetPropertyAction;
52
53 public class FileChannelImpl
54 extends FileChannel
55 {
56 // Memory allocation size for mapping buffers
57 private static final long allocationGranularity;
58
59 // Access to FileDispatcher internals
60 private static final JavaIOFileDescriptorAccess fdAccess =
61 SharedSecrets.getJavaIOFileDescriptorAccess();
62
63 // Used to make native read and write calls
64 private final FileDispatcher nd;
65
66 // File descriptor
67 private final FileDescriptor fd;
68
69 // File access mode (immutable)
70 private final boolean writable;
828 address = 0;
829
830 // if this mapping has a valid file descriptor then we close it
831 if (fd.valid()) {
832 try {
833 nd.close(fd);
834 } catch (IOException ignore) {
835 // nothing we can do
836 }
837 }
838
839 synchronized (Unmapper.class) {
840 count--;
841 totalSize -= size;
842 totalCapacity -= cap;
843 }
844 }
845 }
846
847 private static void unmap(MappedByteBuffer bb) {
848 Cleaner cl = ((DirectBuffer)bb).cleaner();
849 if (cl != null)
850 cl.clean();
851 }
852
853 private static final int MAP_RO = 0;
854 private static final int MAP_RW = 1;
855 private static final int MAP_PV = 2;
856
857 public MappedByteBuffer map(MapMode mode, long position, long size)
858 throws IOException
859 {
860 ensureOpen();
861 if (mode == null)
862 throw new NullPointerException("Mode is null");
863 if (position < 0L)
864 throw new IllegalArgumentException("Negative position");
865 if (size < 0L)
866 throw new IllegalArgumentException("Negative size");
867 if (position + size < 0)
868 throw new IllegalArgumentException("Position + size overflow");
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10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.nio.ch;
27
28 import java.io.FileDescriptor;
29 import java.io.IOException;
30 import java.lang.ref.Cleaner;
31 import java.nio.ByteBuffer;
32 import java.nio.MappedByteBuffer;
33 import java.nio.channels.ClosedByInterruptException;
34 import java.nio.channels.ClosedChannelException;
35 import java.nio.channels.FileChannel;
36 import java.nio.channels.FileLock;
37 import java.nio.channels.FileLockInterruptionException;
38 import java.nio.channels.NonReadableChannelException;
39 import java.nio.channels.NonWritableChannelException;
40 import java.nio.channels.OverlappingFileLockException;
41 import java.nio.channels.ReadableByteChannel;
42 import java.nio.channels.SelectableChannel;
43 import java.nio.channels.WritableByteChannel;
44 import java.security.AccessController;
45 import java.util.ArrayList;
46 import java.util.List;
47
48 import jdk.internal.misc.JavaIOFileDescriptorAccess;
49 import jdk.internal.misc.JavaNioAccess;
50 import jdk.internal.misc.SharedSecrets;
51 import sun.security.action.GetPropertyAction;
52
53 public class FileChannelImpl
54 extends FileChannel
55 {
56 // Memory allocation size for mapping buffers
57 private static final long allocationGranularity;
58
59 // Access to FileDispatcher internals
60 private static final JavaIOFileDescriptorAccess fdAccess =
61 SharedSecrets.getJavaIOFileDescriptorAccess();
62
63 // Used to make native read and write calls
64 private final FileDispatcher nd;
65
66 // File descriptor
67 private final FileDescriptor fd;
68
69 // File access mode (immutable)
70 private final boolean writable;
828 address = 0;
829
830 // if this mapping has a valid file descriptor then we close it
831 if (fd.valid()) {
832 try {
833 nd.close(fd);
834 } catch (IOException ignore) {
835 // nothing we can do
836 }
837 }
838
839 synchronized (Unmapper.class) {
840 count--;
841 totalSize -= size;
842 totalCapacity -= cap;
843 }
844 }
845 }
846
847 private static void unmap(MappedByteBuffer bb) {
848 Cleaner.Cleanable cl = ((DirectBuffer)bb).cleaner();
849 if (cl != null)
850 cl.clean();
851 }
852
853 private static final int MAP_RO = 0;
854 private static final int MAP_RW = 1;
855 private static final int MAP_PV = 2;
856
857 public MappedByteBuffer map(MapMode mode, long position, long size)
858 throws IOException
859 {
860 ensureOpen();
861 if (mode == null)
862 throw new NullPointerException("Mode is null");
863 if (position < 0L)
864 throw new IllegalArgumentException("Negative position");
865 if (size < 0L)
866 throw new IllegalArgumentException("Negative size");
867 if (position + size < 0)
868 throw new IllegalArgumentException("Position + size overflow");
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