1 /*

     2  * Copyright 2000-2002 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

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

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

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

    23  * have any questions.

    24  */

    25 

    26 #include "jni.h"

    27 #include "jni_util.h"

    28 #include "jvm.h"

    29 #include "jlong.h"

    30 #include "sun_nio_ch_FileDispatcher.h"

    31 #include <sys/types.h>

    32 #include <sys/socket.h>

    33 #include <fcntl.h>

    34 #include <sys/uio.h>

    35 #include "nio_util.h"

    36 

    37 

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

    39                                    before closing them for real */

    40 

    41 

    42 JNIEXPORT void JNICALL

    43 Java_sun_nio_ch_FileDispatcher_init(JNIEnv *env, jclass cl)

    44 {

    45     int sp[2];

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

    47         JNU_ThrowIOExceptionWithLastError(env, "socketpair failed");

    48         return;

    49     }

    50     preCloseFD = sp[0];

    51     close(sp[1]);

    52 }

    53 

    54 JNIEXPORT jint JNICALL

    55 Java_sun_nio_ch_FileDispatcher_read0(JNIEnv *env, jclass clazz,

    56                              jobject fdo, jlong address, jint len)

    57 {

    58     jint fd = fdval(env, fdo);

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

    60 

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

    62 }

    63 

    64 JNIEXPORT jint JNICALL

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

    66                             jlong address, jint len, jlong offset)

    67 {

    68     jint fd = fdval(env, fdo);

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

    70 

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

    72 }

    73 

    74 JNIEXPORT jlong JNICALL

    75 Java_sun_nio_ch_FileDispatcher_readv0(JNIEnv *env, jclass clazz,

    76                               jobject fdo, jlong address, jint len)

    77 {

    78     jint fd = fdval(env, fdo);

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

    80     if (len > 16) {

    81         len = 16;

    82     }

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

    84 }

    85 

    86 JNIEXPORT jint JNICALL

    87 Java_sun_nio_ch_FileDispatcher_write0(JNIEnv *env, jclass clazz,

    88                               jobject fdo, jlong address, jint len)

    89 {

    90     jint fd = fdval(env, fdo);

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

    92 

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

    94 }

    95 

    96 JNIEXPORT jint JNICALL

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

    98                             jlong address, jint len, jlong offset)

    99 {

   100     jint fd = fdval(env, fdo);

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

   102 

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

   104 }

   105 

   106 JNIEXPORT jlong JNICALL

   107 Java_sun_nio_ch_FileDispatcher_writev0(JNIEnv *env, jclass clazz,

   108                                        jobject fdo, jlong address, jint len)

   109 {

   110     jint fd = fdval(env, fdo);

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

   112     if (len > 16) {

   113         len = 16;

   114     }

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

   116 }

   117 

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

   119     if (fd != -1) {

   120         int result = close(fd);

   121         if (result < 0)

   122             JNU_ThrowIOExceptionWithLastError(env, "Close failed");

   123     }

   124 }

   125 

   126 JNIEXPORT void JNICALL

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

   128 {

   129     jint fd = fdval(env, fdo);

   130     closeFileDescriptor(env, fd);

   131 }

   132 

   133 JNIEXPORT void JNICALL

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

   135 {

   136     jint fd = fdval(env, fdo);

   137     if (preCloseFD >= 0) {

   138         if (dup2(preCloseFD, fd) < 0)

   139             JNU_ThrowIOExceptionWithLastError(env, "dup2 failed");

   140     }

   141 }

   142 

   143 JNIEXPORT void JNICALL

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

   145 {

   146     closeFileDescriptor(env, fd);

   147 }