/*

 * 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 <sys/types.h>

#include <sys/socket.h>

#ifdef __solaris__

#include <unistd.h>

#include <stropts.h>

#ifndef BSD_COMP

#define BSD_COMP

#endif

#endif

#include <sys/ioctl.h>

#include "jvm.h"

#include "jni_util.h"

#include "net_util.h"

#include "java_net_AbstractPlainDatagramSocketImpl.h"

static jfieldID IO_fd_fdID;

static jfieldID apdsi_fdID;

/*

 * 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);

}

/*

 * Class:     java_net_AbstractPlainDatagramSocketImpl

 * Method:    dataAvailable

 * Signature: ()I

 */

JNIEXPORT jint JNICALL Java_java_net_AbstractPlainDatagramSocketImpl_dataAvailable

(JNIEnv *env, jobject this) {

    int fd, retval;

    jobject fdObj = (*env)->GetObjectField(env, this, apdsi_fdID);

    if (IS_NULL(fdObj)) {

        JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",

                        "Socket closed");

        return -1;

    }

    fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);

    if (ioctl(fd, FIONREAD, &retval) < 0) {

        return -1;

    }

    return retval;

}