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/*
* Copyright (c) 2014, 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 <windows.h>
#include <winsock2.h>
#include "jvm.h"
#include "jni_util.h"
#include "net_util.h"
#include "java_net_AbstractPlainDatagramSocketImpl.h"
static jfieldID IO_fd_fdID = NULL;
static jfieldID apdsi_fdID = NULL;
static jfieldID apdsi_fd1ID = NULL;
static jclass two_stacks_clazz = NULL;
/*
* Class: java_net_AbstractPlainDatagramSocketImpl
* Method: init
* Signature: ()V
*/
JNIEXPORT void JNICALL
Java_java_net_AbstractPlainDatagramSocketImpl_init(JNIEnv *env, jclass cls) {
apdsi_fdID = (*env)->GetFieldID(env, cls, "fd",
"Ljava/io/FileDescriptor;");
CHECK_NULL(apdsi_fdID);
IO_fd_fdID = NET_GetFileDescriptorID(env);
CHECK_NULL(IO_fd_fdID);
two_stacks_clazz = (*env)->FindClass(env, "java/net/TwoStacksPlainDatagramSocketImpl");
CHECK_NULL(two_stacks_clazz);
/* Handle both TwoStacks and DualStack here */
if (JNU_Equals(env, cls, two_stacks_clazz)) {
/* fd1 present only in TwoStack.. */
apdsi_fd1ID = (*env)->GetFieldID(env, cls, "fd1",
"Ljava/io/FileDescriptor;");
CHECK_NULL(apdsi_fd1ID);
}
JNU_CHECK_EXCEPTION(env);
}
/*
* Class: java_net_AbstractPlainDatagramSocketImpl
* Method: dataAvailable
* Signature: ()I
*/
JNIEXPORT jint JNICALL Java_java_net_AbstractPlainDatagramSocketImpl_dataAvailable
(JNIEnv *env, jobject this) {
SOCKET fd;
SOCKET fd1;
int rv = -1, rv1 = -1;
jobject fdObj = (*env)->GetObjectField(env, this, apdsi_fdID);
if (!IS_NULL(fdObj)) {
int retval = 0;
fd = (SOCKET)(*env)->GetIntField(env, fdObj, IO_fd_fdID);
rv = ioctlsocket(fd, FIONREAD, &retval);
if (retval > 0) {
return retval;
}
}
if (!IS_NULL(apdsi_fd1ID)) {
/* TwoStacks */
jobject fd1Obj = (*env)->GetObjectField(env, this, apdsi_fd1ID);
if (!IS_NULL(fd1Obj)) {
int retval = 0;
fd1 = (SOCKET)(*env)->GetIntField(env, fd1Obj, IO_fd_fdID);
rv1 = ioctlsocket(fd1, FIONREAD, &retval);
if (retval > 0) {
return retval;
}
}
}
if (rv < 0 && rv1 < 0) {
JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
"Socket closed");
return -1;
}
return 0;
}
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