1 /*

     2  * Copyright 2000-2009 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_FileDispatcherImpl.h"

    31 #include "java_lang_Long.h"

    32 #include <sys/types.h>

    33 #include <sys/socket.h>

    34 #include <fcntl.h>

    35 #include <sys/uio.h>

    36 #include "nio.h"

    37 #include "nio_util.h"

    38 

    39 

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

    41                                    before closing them for real */

    42 

    43 

    44 JNIEXPORT void JNICALL

    45 Java_sun_nio_ch_FileDispatcherImpl_init(JNIEnv *env, jclass cl)

    46 {

    47     int sp[2];

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

    49         JNU_ThrowIOExceptionWithLastError(env, "socketpair failed");

    50         return;

    51     }

    52     preCloseFD = sp[0];

    53     close(sp[1]);

    54 }

    55 

    56 JNIEXPORT jint JNICALL

    57 Java_sun_nio_ch_FileDispatcherImpl_read0(JNIEnv *env, jclass clazz,

    58                              jobject fdo, jlong address, jint len)

    59 {

    60     jint fd = fdval(env, fdo);

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

    62 

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

    64 }

    65 

    66 JNIEXPORT jint JNICALL

    67 Java_sun_nio_ch_FileDispatcherImpl_pread0(JNIEnv *env, jclass clazz, jobject fdo,

    68                             jlong address, jint len, jlong offset)

    69 {

    70     jint fd = fdval(env, fdo);

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

    72 

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

    74 }

    75 

    76 JNIEXPORT jlong JNICALL

    77 Java_sun_nio_ch_FileDispatcherImpl_readv0(JNIEnv *env, jclass clazz,

    78                               jobject fdo, jlong address, jint len)

    79 {

    80     jint fd = fdval(env, fdo);

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

    82     if (len > 16) {

    83         len = 16;

    84     }

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

    86 }

    87 

    88 JNIEXPORT jint JNICALL

    89 Java_sun_nio_ch_FileDispatcherImpl_write0(JNIEnv *env, jclass clazz,

    90                               jobject fdo, jlong address, jint len)

    91 {

    92     jint fd = fdval(env, fdo);

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

    94 

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

    96 }

    97 

    98 JNIEXPORT jint JNICALL

    99 Java_sun_nio_ch_FileDispatcherImpl_pwrite0(JNIEnv *env, jclass clazz, jobject fdo,

   100                             jlong address, jint len, jlong offset)

   101 {

   102     jint fd = fdval(env, fdo);

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

   104 

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

   106 }

   107 

   108 JNIEXPORT jlong JNICALL

   109 Java_sun_nio_ch_FileDispatcherImpl_writev0(JNIEnv *env, jclass clazz,

   110                                        jobject fdo, jlong address, jint len)

   111 {

   112     jint fd = fdval(env, fdo);

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

   114     if (len > 16) {

   115         len = 16;

   116     }

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

   118 }

   119 

   120 static jlong

   121 handle(JNIEnv *env, jlong rv, char *msg)

   122 {

   123     if (rv >= 0)

   124         return rv;

   125     if (errno == EINTR)

   126         return IOS_INTERRUPTED;

   127     JNU_ThrowIOExceptionWithLastError(env, msg);

   128     return IOS_THROWN;

   129 }

   130 

   131 JNIEXPORT jint JNICALL

   132 Java_sun_nio_ch_FileDispatcherImpl_force0(JNIEnv *env, jobject this,

   133                                           jobject fdo, jboolean md)

   134 {

   135     jint fd = fdval(env, fdo);

   136     int result = 0;

   137 

   138     if (md == JNI_FALSE) {

   139         result = fdatasync(fd);

   140     } else {

   141         result = fsync(fd);

   142     }

   143     return handle(env, result, "Force failed");

   144 }

   145 

   146 JNIEXPORT jint JNICALL

   147 Java_sun_nio_ch_FileDispatcherImpl_truncate0(JNIEnv *env, jobject this,

   148                                              jobject fdo, jlong size)

   149 {

   150     return handle(env,

   151                   ftruncate64(fdval(env, fdo), size),

   152                   "Truncation failed");

   153 }

   154 

   155 JNIEXPORT jlong JNICALL

   156 Java_sun_nio_ch_FileDispatcherImpl_size0(JNIEnv *env, jobject this, jobject fdo)

   157 {

   158     struct stat64 fbuf;

   159 

   160     if (fstat64(fdval(env, fdo), &fbuf) < 0)

   161         return handle(env, -1, "Size failed");

   162     return fbuf.st_size;

   163 }

   164 

   165 JNIEXPORT jint JNICALL

   166 Java_sun_nio_ch_FileDispatcherImpl_lock0(JNIEnv *env, jobject this, jobject fdo,

   167                                       jboolean block, jlong pos, jlong size,

   168                                       jboolean shared)

   169 {

   170     jint fd = fdval(env, fdo);

   171     jint lockResult = 0;

   172     int cmd = 0;

   173     struct flock64 fl;

   174 

   175     fl.l_whence = SEEK_SET;

   176     if (size == (jlong)java_lang_Long_MAX_VALUE) {

   177         fl.l_len = (off64_t)0;

   178     } else {

   179         fl.l_len = (off64_t)size;

   180     }

   181     fl.l_start = (off64_t)pos;

   182     if (shared == JNI_TRUE) {

   183         fl.l_type = F_RDLCK;

   184     } else {

   185         fl.l_type = F_WRLCK;

   186     }

   187     if (block == JNI_TRUE) {

   188         cmd = F_SETLKW64;

   189     } else {

   190         cmd = F_SETLK64;

   191     }

   192     lockResult = fcntl(fd, cmd, &fl);

   193     if (lockResult < 0) {

   194         if ((cmd == F_SETLK64) && (errno == EAGAIN))

   195             return sun_nio_ch_FileDispatcherImpl_NO_LOCK;

   196         if (errno == EINTR)

   197             return sun_nio_ch_FileDispatcherImpl_INTERRUPTED;

   198         JNU_ThrowIOExceptionWithLastError(env, "Lock failed");

   199     }

   200     return 0;

   201 }

   202 

   203 JNIEXPORT void JNICALL

   204 Java_sun_nio_ch_FileDispatcherImpl_release0(JNIEnv *env, jobject this,

   205                                          jobject fdo, jlong pos, jlong size)

   206 {

   207     jint fd = fdval(env, fdo);

   208     jint lockResult = 0;

   209     struct flock64 fl;

   210     int cmd = F_SETLK64;

   211 

   212     fl.l_whence = SEEK_SET;

   213     if (size == (jlong)java_lang_Long_MAX_VALUE) {

   214         fl.l_len = (off64_t)0;

   215     } else {

   216         fl.l_len = (off64_t)size;

   217     }

   218     fl.l_start = (off64_t)pos;

   219     fl.l_type = F_UNLCK;

   220     lockResult = fcntl(fd, cmd, &fl);

   221     if (lockResult < 0) {

   222         JNU_ThrowIOExceptionWithLastError(env, "Release failed");

   223     }

   224 }

   225 

   226 

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

   228     if (fd != -1) {

   229         int result = close(fd);

   230         if (result < 0)

   231             JNU_ThrowIOExceptionWithLastError(env, "Close failed");

   232     }

   233 }

   234 

   235 JNIEXPORT void JNICALL

   236 Java_sun_nio_ch_FileDispatcherImpl_close0(JNIEnv *env, jclass clazz, jobject fdo)

   237 {

   238     jint fd = fdval(env, fdo);

   239     closeFileDescriptor(env, fd);

   240 }

   241 

   242 JNIEXPORT void JNICALL

   243 Java_sun_nio_ch_FileDispatcherImpl_preClose0(JNIEnv *env, jclass clazz, jobject fdo)

   244 {

   245     jint fd = fdval(env, fdo);

   246     if (preCloseFD >= 0) {

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

   248             JNU_ThrowIOExceptionWithLastError(env, "dup2 failed");

   249     }

   250 }

   251 

   252 JNIEXPORT void JNICALL

   253 Java_sun_nio_ch_FileDispatcherImpl_closeIntFD(JNIEnv *env, jclass clazz, jint fd)

   254 {

   255     closeFileDescriptor(env, fd);

   256 }