ojluni/src/main/native/SocketChannelImpl.c

/*
 * Copyright (c) 2000, 2010, 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 <sys/socket.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <poll.h>

#if __linux__
#include <netinet/in.h>
#endif

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

#include "JNIHelp.h"

#define NATIVE_METHOD(className, functionName, signature) \
{ #functionName, signature, (void*)(Java_sun_nio_ch_ ## className ## _ ## functionName) }

JNIEXPORT jint JNICALL
Java_sun_nio_ch_SocketChannelImpl_checkConnect(JNIEnv *env, jobject this,
                                               jobject fdo, jboolean block,
                                               jboolean ready)
{
    int error = 0;
    socklen_t n = sizeof(int);
    jint fd = fdval(env, fdo);
    int result = 0;
    struct pollfd poller;

    poller.revents = 1;
    if (!ready) {
        poller.fd = fd;
        poller.events = POLLOUT;
        poller.revents = 0;
        result = poll(&poller, 1, block ? -1 : 0);
        if (result < 0) {
            JNU_ThrowIOExceptionWithLastError(env, "Poll failed");
            return IOS_THROWN;
        }
        if (!block && (result == 0))
            return IOS_UNAVAILABLE;
    }

    if (poller.revents) {
        errno = 0;
        result = getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &n);
        if (result < 0) {
            handleSocketError(env, errno);
            return JNI_FALSE;
        } else if (error) {
            handleSocketError(env, error);
            return JNI_FALSE;
        }
        return 1;
    }
    return 0;
}

JNIEXPORT jint JNICALL
Java_sun_nio_ch_SocketChannelImpl_sendOutOfBandData(JNIEnv* env, jclass this,
                                                    jobject fdo, jbyte b)
{
    int n = send(fdval(env, fdo), (const void*)&b, 1, MSG_OOB);
    return convertReturnVal(env, n, JNI_FALSE);
}

static JNINativeMethod gMethods[] = {
  NATIVE_METHOD(SocketChannelImpl, checkConnect, "(Ljava/io/FileDescriptor;ZZ)I"),
  NATIVE_METHOD(SocketChannelImpl, sendOutOfBandData, "(Ljava/io/FileDescriptor;B)I"),
};

void register_sun_nio_ch_SocketChannelImpl(JNIEnv* env) {
  jniRegisterNativeMethods(env, "sun/nio/ch/SocketChannelImpl", gMethods, NELEM(gMethods));
}