JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2003, 2019, 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.
 */

#include "jni.h"
#include "jni_util.h"

/*
 * Macros to use the right data type for file descriptors
 */
#define FD jlong

/*
 * Prototypes for functions in io_util_md.c called from io_util.c,
 * FileDescriptor.c, FileInputStream.c, FileOutputStream.c,
 * ProcessImpl_md.c
 */
WCHAR* pathToNTPath(JNIEnv *env, jstring path, jboolean throwFNFE);
WCHAR* fileToNTPath(JNIEnv *env, jobject file, jfieldID id);
JNIEXPORT WCHAR* getPrefixed(const WCHAR* path, int pathlen);
WCHAR* currentDir(int di);
int currentDirLength(const WCHAR* path, int pathlen);
int handleAvailable(FD fd, jlong *pbytes);
int handleSync(FD fd);
jint handleSetLength(FD fd, jlong length);
jlong handleGetLength(FD fd);
JNIEXPORT jint handleRead(FD fd, void *buf, jint len);
jint handleWrite(FD fd, const void *buf, jint len);
jint handleAppend(FD fd, const void *buf, jint len);
void fileDescriptorClose(JNIEnv *env, jobject this);
JNIEXPORT jlong JNICALL
handleLseek(FD fd, jlong offset, jint whence);

/*
 * Returns an opaque handle to file named by "path".  If an error occurs,
 * returns -1 and an exception is pending.
 */
FD winFileHandleOpen(JNIEnv *env, jstring path, int flags);

/*
 * Macros to set/get fd from the java.io.FileDescriptor.
 * If GetObjectField returns null, SET_FD will stop and GET_FD
 * will simply return -1 to avoid crashing VM.
 */
#define SET_FD(this, fd, fid) \
    if ((*env)->GetObjectField(env, (this), (fid)) != NULL) \
        (*env)->SetLongField(env, (*env)->GetObjectField(env, (this), (fid)), IO_handle_fdID, (fd))

#define GET_FD(this, fid) \
    ((*env)->GetObjectField(env, (this), (fid)) == NULL) ? \
      -1 : (*env)->GetLongField(env, (*env)->GetObjectField(env, (this), (fid)), IO_handle_fdID)

/*
 * Macros to set/get fd when inside java.io.FileDescriptor
 */
#define THIS_FD(obj) (*env)->GetLongField(env, obj, IO_handle_fdID)

/*
 * Route the routines away from VM
 */
#define IO_Append handleAppend
#define IO_Write handleWrite
#define IO_Sync handleSync
#define IO_Read handleRead
#define IO_Lseek handleLseek
#define IO_Available handleAvailable
#define IO_SetLength handleSetLength
#define IO_GetLength handleGetLength

/*
 * Setting the handle field in Java_java_io_FileDescriptor_set for
 * standard handles stdIn, stdOut, stdErr
 */
#define SET_HANDLE(fd) \
if (fd == 0) { \
    return (jlong)GetStdHandle(STD_INPUT_HANDLE); \
} else if (fd == 1) { \

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