1 /*

     2  * Copyright (c) 2018, 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 "jdk_internal_net_rdma_RdmaSocketChannelImpl.h"

    27 #include "nio_util.h"

    28 #include "nio.h"

    29 #include <Rsocket.h>

    30 

    31 static jfieldID fd_fdID;

    32 

    33 JNIEXPORT void JNICALL

    34 Java_jdk_internal_net_rdma_RdmaSocketChannelImpl_initIDs(JNIEnv *env,

    35         jclass clazz) {

    36     loadRdmaFuncs(env);

    37     CHECK_NULL(clazz = (*env)->FindClass(env, "java/io/FileDescriptor"));

    38     CHECK_NULL(fd_fdID = (*env)->GetFieldID(env, clazz, "fd", "I"));

    39 }

    40 

    41 jint fdVal(JNIEnv *env, jobject fdo) {

    42     return (*env)->GetIntField(env, fdo, fd_fdID);

    43 }

    44 

    45 JNIEXPORT jint JNICALL

    46 Java_jdk_internal_net_rdma_RdmaSocketChannelImpl_checkConnect(JNIEnv *env,

    47         jobject this, jobject fdo, jboolean block) {

    48     int error = 0;

    49     socklen_t n = sizeof(int);

    50     jint fd = fdVal(env, fdo);

    51     int result = 0;

    52     struct pollfd poller;

    53 

    54     poller.fd = fd;

    55     poller.events = POLLOUT;

    56     poller.revents = 0;

    57 

    58     result = rs_poll(&poller, 1, block ? -1 : 0);

    59 

    60     if (result < 0) {

    61         if (errno == EINTR) {

    62             return IOS_INTERRUPTED;

    63         } else {

    64             JNU_ThrowIOExceptionWithLastError(env, "rpoll failed");

    65             return IOS_THROWN;

    66         }

    67     }

    68     if (!block && (result == 0))

    69         return IOS_UNAVAILABLE;

    70 

    71     if (result > 0) {

    72         errno = 0;

    73         result = rs_getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &n);

    74         if (result < 0) {

    75             return handleSocketError(env, errno);

    76         } else if (error) {

    77             return handleSocketError(env, error);

    78         } else if ((poller.revents & POLLHUP) != 0) {

    79             return handleSocketError(env, ENOTCONN);

    80         }

    81         // connected

    82         return 1;

    83     }

    84     return 0;

    85 }

    86 

    87 JNIEXPORT jint JNICALL

    88 Java_jdk_internal_net_rdma_RdmaSocketChannelImpl_sendOutOfBandData(JNIEnv* env,

    89         jclass this, jobject fdo, jbyte b) {

    90     int n = rs_send(fdVal(env, fdo), (const void*)&b, 1, MSG_OOB);

    91     return convertReturnVal(env, n, JNI_FALSE);

    92 }