JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2019, 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
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 */

 #include <sys/types.h>
 #include <sys/uio.h>
 #include <unistd.h>

 #include "jni.h"
 #include "jni_util.h"
 #include "jlong.h"
 #include "nio.h"
 #include "nio_util.h"
 #include "sun_nio_ch_SocketDispatcher.h"

 JNIEXPORT jint JNICALL
 Java_sun_nio_ch_SocketDispatcher_read0(JNIEnv *env, jclass clazz,
                                        jobject fdo, jlong address, jint len)
 {
     jint fd = fdval(env, fdo);
     void *buf = (void *)jlong_to_ptr(address);
     jint n = read(fd, buf, len);
     if ((n == -1) && (errno == ECONNRESET || errno == EPIPE)) {
         JNU_ThrowByName(env, "sun/net/ConnectionResetException", "Connection reset");
         return IOS_THROWN;
     } else {
         return convertReturnVal(env, n, JNI_TRUE);
     }
 }

 JNIEXPORT jlong JNICALL
 Java_sun_nio_ch_SocketDispatcher_readv0(JNIEnv *env, jclass clazz,
                                         jobject fdo, jlong address, jint len)
 {
     jint fd = fdval(env, fdo);
     struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
     jlong n = readv(fd, iov, len);

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