1 /*

     2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 #include <sys/types.h>

    27 #include <sys/socket.h>

    28 

    29 #ifdef __solaris__

    30 #include <unistd.h>

    31 #include <stropts.h>

    32 

    33 #ifndef BSD_COMP

    34 #define BSD_COMP

    35 #endif

    36 

    37 #endif

    38 

    39 #include <sys/ioctl.h>

    40 

    41 #include "jvm.h"

    42 #include "jni_util.h"

    43 #include "net_util.h"

    44 

    45 #include "java_net_AbstractPlainDatagramSocketImpl.h"

    46 

    47 static jfieldID IO_fd_fdID;

    48 

    49 static jfieldID apdsi_fdID;

    50 

    51 

    52 /*

    53  * Class:     java_net_AbstractPlainDatagramSocketImpl

    54  * Method:    init

    55  * Signature: ()V

    56  */

    57 JNIEXPORT void JNICALL

    58 Java_java_net_AbstractPlainDatagramSocketImpl_init(JNIEnv *env, jclass cls) {

    59 

    60     apdsi_fdID = (*env)->GetFieldID(env, cls, "fd",

    61                                    "Ljava/io/FileDescriptor;");

    62     CHECK_NULL(apdsi_fdID);

    63 

    64     IO_fd_fdID = NET_GetFileDescriptorID(env);

    65 }

    66 

    67 /*

    68  * Class:     java_net_AbstractPlainDatagramSocketImpl

    69  * Method:    dataAvailable

    70  * Signature: ()I

    71  */

    72 JNIEXPORT jint JNICALL Java_java_net_AbstractPlainDatagramSocketImpl_dataAvailable

    73 (JNIEnv *env, jobject this) {

    74     int fd, retval;

    75 

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

    77 

    78     if (IS_NULL(fdObj)) {

    79         JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",

    80                         "Socket closed");

    81         return -1;

    82     }

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

    84 

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

    86         return -1;

    87     }

    88     return retval;

    89 }