/*

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

#include "nio_util.h"

#include "nio.h"

#include <Rsocket.h>

static jfieldID fd_fdID;

JNIEXPORT void JNICALL

Java_jdk_internal_net_rdma_RdmaSocketChannelImpl_initIDs(JNIEnv *env,

        jclass clazz) {

    loadRdmaFuncs(env);

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

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

}

jint fdVal(JNIEnv *env, jobject fdo) {

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

}

JNIEXPORT jint JNICALL

Java_jdk_internal_net_rdma_RdmaSocketChannelImpl_checkConnect(JNIEnv *env,

        jobject this, jobject fdo, jboolean block) {

    int error = 0;

    socklen_t n = sizeof(int);

    jint fd = fdVal(env, fdo);

    int result = 0;

    struct pollfd poller;

    poller.fd = fd;

    poller.events = POLLOUT;

    poller.revents = 0;

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

    if (result < 0) {

        if (errno == EINTR) {

            return IOS_INTERRUPTED;

        } else {

            JNU_ThrowIOExceptionWithLastError(env, "rpoll failed");

            return IOS_THROWN;

        }

    }

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

        return IOS_UNAVAILABLE;

    if (result > 0) {

        errno = 0;

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

        if (result < 0) {

            return handleSocketError(env, errno);

        } else if (error) {

            return handleSocketError(env, error);

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

            return handleSocketError(env, ENOTCONN);

        }

        // connected

        return 1;

    }

    return 0;

}

JNIEXPORT jint JNICALL

Java_jdk_internal_net_rdma_RdmaSocketChannelImpl_sendOutOfBandData(JNIEnv* env,

        jclass this, jobject fdo, jbyte b) {

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

    return convertReturnVal(env, n, JNI_FALSE);

}