src/java.base/share/native/libjava/FileOutputStream.c

/*
 * Copyright (c) 1997, 2021, 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"
#include "jvm.h"

#include "io_util.h"
#include "io_util_md.h"
#include "java_io_FileOutputStream.h"

#include <fcntl.h>

/*******************************************************************/
/*  BEGIN JNI ********* BEGIN JNI *********** BEGIN JNI ************/
/*******************************************************************/

jfieldID fos_fd; /* id for jobject 'fd' in java.io.FileOutputStream */

/**************************************************************
 * static methods to store field ID's in initializers
 */

JNIEXPORT void JNICALL
Java_java_io_FileOutputStream_initIDs(JNIEnv *env, jclass fosClass) {
    fos_fd = (*env)->GetFieldID(env, fosClass, "fd", "Ljava/io/FileDescriptor;");
}

/**************************************************************
 * Output stream
 */

JNIEXPORT void JNICALL
Java_java_io_FileOutputStream_open0(JNIEnv *env, jobject this,
                                    jstring path, jboolean append) {
    fileOpen(env, this, path, fos_fd,
             O_WRONLY | O_CREAT | (append ? O_APPEND : O_TRUNC));
}

JNIEXPORT void JNICALL
Java_java_io_FileOutputStream_write(JNIEnv *env, jobject this, jint byte, jboolean append) {
    writeSingle(env, this, byte, append, fos_fd);
}

JNIEXPORT void JNICALL
Java_java_io_FileOutputStream_writeBytes(JNIEnv *env,
    jobject this, jbyteArray bytes, jint off, jint len, jboolean append) {
    writeBytes(env, this, bytes, off, len, append, fos_fd);
}