/*
 * Copyright (c) 2000, 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 <netdb.h>
#include <sys/types.h>
#include <rdma/rsocket.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <poll.h>

#include <netinet/in.h>

#include "jni.h"
#include "jni_util.h"
#include "net_util.h"
#include "jvm.h"
#include "jlong.h"
#include "rdma_ch_RdmaSocketChannelImpl.h"
#include "nio_util.h"
#include "nio.h"

static jfieldID fd_fdID;

JNIEXPORT void JNICALL
Java_rdma_ch_RdmaSocketChannelImpl_initIDs(JNIEnv *env, jclass clazz)
{
    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_rdma_ch_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 = rpoll(&poller, 1, block ? -1 : 0);

    if (result < 0) {
        if (errno == EINTR) {
            return IOS_INTERRUPTED;
        } else {
            JNU_ThrowIOExceptionWithLastError(env, "poll failed");
            return IOS_THROWN;
        }
    }
    if (!block && (result == 0))
        return IOS_UNAVAILABLE;

    if (result > 0) {
        errno = 0;
        result = rgetsockopt(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_rdma_ch_RdmaSocketChannelImpl_sendOutOfBandData(JNIEnv* env, jclass this,
                                                    jobject fdo, jbyte b)
{
    int n = rsend(fdVal(env, fdo), (const void*)&b, 1, MSG_OOB);
    return convertReturnVal(env, n, JNI_FALSE);
}