/*

 * Copyright 2000-2002 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

#include "jni.h"

#include "jni_util.h"

#include "jvm.h"

#include "jlong.h"

#include "sun_nio_ch_FileDispatcher.h"

#include <sys/types.h>

#include <sys/socket.h>

#include <fcntl.h>

#include <sys/uio.h>

#include "nio_util.h"

static int preCloseFD = -1;     /* File descriptor to which we dup other fd's

                                   before closing them for real */

JNIEXPORT void JNICALL

Java_sun_nio_ch_FileDispatcher_init(JNIEnv *env, jclass cl)

{

    int sp[2];

    if (socketpair(PF_UNIX, SOCK_STREAM, 0, sp) < 0) {

        JNU_ThrowIOExceptionWithLastError(env, "socketpair failed");

        return;

    }

    preCloseFD = sp[0];

    close(sp[1]);

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_FileDispatcher_read0(JNIEnv *env, jclass clazz,

                             jobject fdo, jlong address, jint len)

{

    jint fd = fdval(env, fdo);

    void *buf = (void *)jlong_to_ptr(address);

    return convertReturnVal(env, read(fd, buf, len), JNI_TRUE);

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_FileDispatcher_pread0(JNIEnv *env, jclass clazz, jobject fdo,

                            jlong address, jint len, jlong offset)

{

    jint fd = fdval(env, fdo);

    void *buf = (void *)jlong_to_ptr(address);

    return convertReturnVal(env, pread64(fd, buf, len, offset), JNI_TRUE);

}

JNIEXPORT jlong JNICALL

Java_sun_nio_ch_FileDispatcher_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);

    if (len > 16) {

        len = 16;

    }

    return convertLongReturnVal(env, readv(fd, iov, len), JNI_TRUE);

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_FileDispatcher_write0(JNIEnv *env, jclass clazz,

                              jobject fdo, jlong address, jint len)

{

    jint fd = fdval(env, fdo);

    void *buf = (void *)jlong_to_ptr(address);

    return convertReturnVal(env, write(fd, buf, len), JNI_FALSE);

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_FileDispatcher_pwrite0(JNIEnv *env, jclass clazz, jobject fdo,

                            jlong address, jint len, jlong offset)

{

    jint fd = fdval(env, fdo);

    void *buf = (void *)jlong_to_ptr(address);

    return convertReturnVal(env, pwrite64(fd, buf, len, offset), JNI_FALSE);

}

JNIEXPORT jlong JNICALL

Java_sun_nio_ch_FileDispatcher_writev0(JNIEnv *env, jclass clazz,

                                       jobject fdo, jlong address, jint len)

{

    jint fd = fdval(env, fdo);

    struct iovec *iov = (struct iovec *)jlong_to_ptr(address);

    if (len > 16) {

        len = 16;

    }

    return convertLongReturnVal(env, writev(fd, iov, len), JNI_FALSE);

}

static void closeFileDescriptor(JNIEnv *env, int fd) {

    if (fd != -1) {

        int result = close(fd);

        if (result < 0)

            JNU_ThrowIOExceptionWithLastError(env, "Close failed");

    }

}

JNIEXPORT void JNICALL

Java_sun_nio_ch_FileDispatcher_close0(JNIEnv *env, jclass clazz, jobject fdo)

{

    jint fd = fdval(env, fdo);

    closeFileDescriptor(env, fd);

}

JNIEXPORT void JNICALL

Java_sun_nio_ch_FileDispatcher_preClose0(JNIEnv *env, jclass clazz, jobject fdo)

{

    jint fd = fdval(env, fdo);

    if (preCloseFD >= 0) {

        if (dup2(preCloseFD, fd) < 0)

            JNU_ThrowIOExceptionWithLastError(env, "dup2 failed");

    }

}

JNIEXPORT void JNICALL

Java_sun_nio_ch_FileDispatcher_closeIntFD(JNIEnv *env, jclass clazz, jint fd)

{

    closeFileDescriptor(env, fd);

}