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The Qbicc builder for the java.base JDK module
/*
* This code is based on OpenJDK source file(s) which contain the following copyright notice:
*
* ------
* Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
* ------
*
* This file may contain additional modifications which are Copyright (c) Red Hat and other
* contributors.
*/
package sun.nio.ch;
import static org.qbicc.runtime.CNative.*;
import static org.qbicc.runtime.linux.SysIoctl.*;
import static org.qbicc.runtime.posix.Errno.*;
import static org.qbicc.runtime.posix.SysStat.*;
import static org.qbicc.runtime.posix.Fcntl.SEEK_CUR;
import static org.qbicc.runtime.posix.SysStat.*;
import static org.qbicc.runtime.posix.SysTypes.*;
import static org.qbicc.runtime.posix.Unistd.*;
import static org.qbicc.runtime.stdc.Errno.*;
import static org.qbicc.runtime.stdc.Stdint.*;
import java.io.File;
import java.io.FileDescriptor;
import java.io.IOException;
import java.nio.CharBuffer;
import org.qbicc.rt.annotation.Tracking;
import org.qbicc.runtime.Build;
import jdk.internal.access.JavaIOFileDescriptorAccess;
import jdk.internal.access.SharedSecrets;
import org.qbicc.runtime.posix.Unistd;
import sun.security.action.GetPropertyAction;
@Tracking("src/java.base/unix/classes/sun/nio/ch/FileDispatcherImpl.java")
@Tracking("src/java.base/unix/native/libnio/ch/FileDispatcherImpl.c")
@Tracking("src/java.base/windows/classes/sun/nio/ch/FileDispatcherImpl.java")
class FileDispatcherImpl extends FileDispatcher {
static {
IOUtil.load();
if (Build.Target.isWindows()) {
fastFileTransfer = isFastFileTransferRequested();
} else {
fastFileTransfer = false;
}
}
private static final JavaIOFileDescriptorAccess fdAccess =
SharedSecrets.getJavaIOFileDescriptorAccess();
// set to true if fast file transmission (TransmitFile) is enabled
private static final boolean fastFileTransfer;
FileDispatcherImpl() {
}
int read(FileDescriptor fd, long address, int len) throws IOException {
return read0(fd, address, len);
}
@Override
boolean needsPositionLock() {
return Build.Target.isWindows();
}
int pread(FileDescriptor fd, long address, int len, long position)
throws IOException
{
return pread0(fd, address, len, position);
}
long readv(FileDescriptor fd, long address, int len) throws IOException {
return readv0(fd, address, len);
}
int write(FileDescriptor fd, long address, int len) throws IOException {
return write0(fd, address, len);
}
int pwrite(FileDescriptor fd, long address, int len, long position)
throws IOException
{
return pwrite0(fd, address, len, position);
}
long writev(FileDescriptor fd, long address, int len)
throws IOException
{
return writev0(fd, address, len);
}
long seek(FileDescriptor fd, long offset) throws IOException {
return seek0(fd, offset);
}
int force(FileDescriptor fd, boolean metaData) throws IOException {
return force0(fd, metaData);
}
int truncate(FileDescriptor fd, long size) throws IOException {
return truncate0(fd, size);
}
long size(FileDescriptor fd) throws IOException {
return size0(fd);
}
int lock(FileDescriptor fd, boolean blocking, long pos, long size,
boolean shared) throws IOException
{
return lock0(fd, blocking, pos, size, shared);
}
void release(FileDescriptor fd, long pos, long size) throws IOException {
release0(fd, pos, size);
}
void close(FileDescriptor fd) throws IOException {
fdAccess.close(fd);
}
void preClose(FileDescriptor fd) throws IOException {
preClose0(fd);
}
FileDescriptor duplicateForMapping(FileDescriptor fd) throws IOException {
if (Build.Target.isWindows()) {
// on Windows we need to keep a handle to the file
FileDescriptor result = new FileDescriptor();
long handle = duplicateHandle(fdAccess.getHandle(fd));
fdAccess.setHandle(result, handle);
fdAccess.registerCleanup(result);
return result;
} else {
// file descriptor not required for mapping operations; okay
// to return invalid file descriptor.
return new FileDescriptor();
}
}
boolean canTransferToDirectly(java.nio.channels.SelectableChannel sc) {
return ! Build.Target.isWindows() || fastFileTransfer && sc.isBlocking();
}
boolean transferToDirectlyNeedsPositionLock() {
return Build.Target.isWindows();
}
boolean canTransferToFromOverlappedMap() {
return ! Build.Target.isMacOs();
}
int setDirectIO(FileDescriptor fd, String path) {
int result;
if (Build.Target.isWindows()) {
String filePath = path.substring(0, path.lastIndexOf(File.separator));
CharBuffer buffer = CharBuffer.allocate(filePath.length());
buffer.put(filePath);
try {
result = setDirect0(fd, buffer);
} catch (IOException e) {
throw new UnsupportedOperationException
("Error setting up DirectIO", e);
}
} else {
try {
result = setDirect0(fd);
} catch (IOException e) {
throw new UnsupportedOperationException
("Error setting up DirectIO", e);
}
}
return result;
}
// -- Native methods --
static int read0(FileDescriptor fd, long address, int len) throws IOException {
if (Build.Target.isPosix()) {
int fdNum = fdAccess.get(fd);
int retVal = Unistd.read(word(fdNum), word(address).cast(), word(len).cast()).intValue();
if (retVal > 0) return retVal;
if (retVal == 0) return -1; // EOF
// error
// todo: cause via strerror
throw new IOException();
} else {
throw new UnsupportedOperationException();
}
}
static native int pread0(FileDescriptor fd, long address, int len,
long position) throws IOException;
static native long readv0(FileDescriptor fd, long address, int len)
throws IOException;
static native int write0(FileDescriptor fd, long address, int len)
throws IOException;
static native int pwrite0(FileDescriptor fd, long address, int len,
long position) throws IOException;
static native int force0(FileDescriptor fd, boolean metaData)
throws IOException;
static long seek0(FileDescriptor fd, long offset) throws IOException {
if (Build.Target.isPosix()) {
int fdNum = fdAccess.get(fd);
off_t result;
if (offset < 0) {
result = lseek(word(fdNum), zero(), SEEK_CUR);
} else {
result = lseek(word(fdNum), word(offset), SEEK_SET);
}
if (result.longValue() < 0) {
if (errno == EINTR.intValue()) return IOStatus.INTERRUPTED;
throw new IOException("Seek failed"); // todo: errno cause
}
return result.longValue();
} else {
throw new UnsupportedOperationException();
}
}
static native int truncate0(FileDescriptor fd, long size)
throws IOException;
static long size0(FileDescriptor fd) throws IOException {
if (Build.Target.isPosix()) {
int fdNum = fdAccess.get(fd);
struct_stat fbuf = auto();
if (fstat(word(fdNum), addr_of(fbuf)).longValue() < 0) {
if (errno == EINTR.intValue()) return IOStatus.INTERRUPTED;
throw new IOException("Size failed"); // todo: errno cause
}
if (Build.Target.isLinux() && defined(BLKGETSIZE64)) {
if ((S_IFBLK.longValue() & fbuf.st_mode.longValue()) != 0) {
uint64_t size = auto();
if (ioctl(word(fdNum), BLKGETSIZE64, addr_of(size)).longValue() < 0) {
if (errno == EINTR.intValue()) return IOStatus.INTERRUPTED;
throw new IOException("Size failed"); // todo: errno cause
}
return size.longValue();
}
}
return fbuf.st_size.longValue();
} else {
throw new UnsupportedOperationException();
}
}
static native int lock0(FileDescriptor fd, boolean blocking, long pos,
long size, boolean shared) throws IOException;
static native void release0(FileDescriptor fd, long pos, long size)
throws IOException;
// Shared with SocketDispatcher and DatagramDispatcher but
// NOT used by FileDispatcherImpl
static native void close0(FileDescriptor fd) throws IOException;
static native void closeIntFD(int fd) throws IOException;
static native int setDirect0(FileDescriptor fd) throws IOException;
// UNIX-specific
static native void preClose0(FileDescriptor fd) throws IOException;
static native long writev0(FileDescriptor fd, long address, int len)
throws IOException;
// Windows-specific
static boolean isFastFileTransferRequested() {
String fileTransferProp = GetPropertyAction
.privilegedGetProperty("jdk.nio.enableFastFileTransfer", "false");
return fileTransferProp.isEmpty() || Boolean.parseBoolean(fileTransferProp);
}
static native long writev0(FileDescriptor fd, long address, int len, boolean append)
throws IOException;
static native long duplicateHandle(long fd) throws IOException;
static native int setDirect0(FileDescriptor fd, CharBuffer buffer) throws IOException;
}
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