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Java example source code file (InheritedChannel.c)

This example Java source code file (InheritedChannel.c) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

af_inet6, java_sun_nio_ch_inheritedchannel_close0, java_sun_nio_ch_inheritedchannel_dup, java_sun_nio_ch_inheritedchannel_dup2, java_sun_nio_ch_inheritedchannel_peerport0, jnicall, jniexport, jnu_getstringplatformchars, jnu_throwioexceptionwithlasterror, net_allocsockaddr, net_sockaddrtoinetaddress, null, o_rdonly, sock_dgram

The InheritedChannel.c Java example source code

/*
 * Copyright (c) 2003, 2008, 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 <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <fcntl.h>

#include "jni.h"

#include "jni.h"
#include "jni_util.h"
#include "net_util.h"

#include "sun_nio_ch_InheritedChannel.h"

static int matchFamily(struct sockaddr *sa) {
    int family = sa->sa_family;
#ifdef AF_INET6
    if (ipv6_available()) {
        return (family == AF_INET6);
    }
#endif
    return (family == AF_INET);
}

JNIEXPORT jobject JNICALL
Java_sun_nio_ch_InheritedChannel_peerAddress0(JNIEnv *env, jclass cla, jint fd)
{
    struct sockaddr *sa;
    socklen_t sa_len;
    jobject remote_ia = NULL;
    jint remote_port;

    NET_AllocSockaddr(&sa, (int *)&sa_len);
    if (getpeername(fd, sa, &sa_len) == 0) {
        if (matchFamily(sa)) {
            remote_ia = NET_SockaddrToInetAddress(env, sa, (int *)&remote_port);
        }
    }
    free((void *)sa);

    return remote_ia;
}


JNIEXPORT jint JNICALL
Java_sun_nio_ch_InheritedChannel_peerPort0(JNIEnv *env, jclass cla, jint fd)
{
    struct sockaddr *sa;
    socklen_t sa_len;
    jint remote_port = -1;

    NET_AllocSockaddr(&sa, (int *)&sa_len);
    if (getpeername(fd, sa, &sa_len) == 0) {
        if (matchFamily(sa)) {
            NET_SockaddrToInetAddress(env, sa, (int *)&remote_port);
        }
    }
    free((void *)sa);

    return remote_port;
}

JNIEXPORT jint JNICALL
Java_sun_nio_ch_InheritedChannel_soType0(JNIEnv *env, jclass cla, jint fd)
{
    int sotype;
    socklen_t arglen=sizeof(sotype);
    if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (void *)&sotype, &arglen) == 0) {
        if (sotype == SOCK_STREAM)
            return sun_nio_ch_InheritedChannel_SOCK_STREAM;
        if (sotype == SOCK_DGRAM)
            return sun_nio_ch_InheritedChannel_SOCK_DGRAM;
    }
    return sun_nio_ch_InheritedChannel_UNKNOWN;
}

JNIEXPORT jint JNICALL
Java_sun_nio_ch_InheritedChannel_dup(JNIEnv *env, jclass cla, jint fd)
{
   int newfd = dup(fd);
   if (newfd < 0) {
        JNU_ThrowIOExceptionWithLastError(env, "dup failed");
   }
   return (jint)newfd;
}

JNIEXPORT void JNICALL
Java_sun_nio_ch_InheritedChannel_dup2(JNIEnv *env, jclass cla, jint fd, jint fd2)
{
   if (dup2(fd, fd2) < 0) {
        JNU_ThrowIOExceptionWithLastError(env, "dup2 failed");
   }
}

JNIEXPORT jint JNICALL
Java_sun_nio_ch_InheritedChannel_open0(JNIEnv *env, jclass cla, jstring path, jint oflag)
{
    const char* str;
    int oflag_actual;

    /* convert to OS specific value */
    switch (oflag) {
        case sun_nio_ch_InheritedChannel_O_RDWR :
            oflag_actual = O_RDWR;
            break;
        case sun_nio_ch_InheritedChannel_O_RDONLY :
            oflag_actual = O_RDONLY;
            break;
        case sun_nio_ch_InheritedChannel_O_WRONLY :
            oflag_actual = O_WRONLY;
            break;
        default :
            JNU_ThrowInternalError(env, "Unrecognized file mode");
            return -1;
    }

    str = JNU_GetStringPlatformChars(env, path, NULL);
    if (str == NULL) {
        return (jint)-1;
    } else {
        int fd = open(str, oflag_actual);
        if (fd < 0) {
            JNU_ThrowIOExceptionWithLastError(env, str);
        }
        JNU_ReleaseStringPlatformChars(env, path, str);
        return (jint)fd;
    }
}

JNIEXPORT void JNICALL
Java_sun_nio_ch_InheritedChannel_close0(JNIEnv *env, jclass cla, jint fd)
{
    if (close(fd) < 0) {
        JNU_ThrowIOExceptionWithLastError(env, "close failed");
    }
}

Other Java examples (source code examples)

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