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src/solaris/native/sun/nio/ch/FileDispatcherImpl.c

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   1 /*
   2  * Copyright (c) 2000, 2012, Oracle and/or its affiliates. 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * 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 <unistd.h>
  37 #if defined(__linux__)
  38 #include <linux/fs.h>
  39 #include <sys/ioctl.h>
  40 #endif
  41 #include "nio.h"
  42 #include "nio_util.h"
  43 
  44 #ifdef _ALLBSD_SOURCE
  45 #define stat64 stat


 156          * reading results in an error ("EBADF: The FileDescriptor parameter is
 157          * not a valid file descriptor open for writing.").
 158          * However, at this point it is not possibly anymore to read the
 159          * 'writable' attribute of the corresponding file channel so we have to
 160          * use 'fcntl'.
 161          */
 162         int getfl = fcntl(fd, F_GETFL);
 163         if (getfl >= 0 && (getfl & O_ACCMODE) == O_RDONLY) {
 164             return 0;
 165         }
 166 #endif
 167         result = fsync(fd);
 168     }
 169     return handle(env, result, "Force failed");
 170 }
 171 
 172 JNIEXPORT jint JNICALL
 173 Java_sun_nio_ch_FileDispatcherImpl_truncate0(JNIEnv *env, jobject this,
 174                                              jobject fdo, jlong size)
 175 {
























 176     return handle(env,
 177                   ftruncate64(fdval(env, fdo), size),
 178                   "Truncation failed");
 179 }
 180 
 181 JNIEXPORT jlong JNICALL
 182 Java_sun_nio_ch_FileDispatcherImpl_size0(JNIEnv *env, jobject this, jobject fdo)
 183 {
 184     jint fd = fdval(env, fdo);
 185     struct stat64 fbuf;
 186 
 187     if (fstat64(fd, &fbuf) < 0)
 188         return handle(env, -1, "Size failed");
 189 
 190 #ifdef BLKGETSIZE64
 191     if (S_ISBLK(fbuf.st_mode)) {
 192         uint64_t size;
 193         if (ioctl(fd, BLKGETSIZE64, &size) < 0)
 194             return handle(env, -1, "Size failed");
 195         return (jlong)size;


   1 /*
   2  * Copyright (c) 2000, 2018, Oracle and/or its affiliates. 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #if defined(__linux__)
  27 #define _FILE_OFFSET_BITS 64
  28 #endif
  29 
  30 #include "jni.h"
  31 #include "jni_util.h"
  32 #include "jvm.h"
  33 #include "jlong.h"
  34 #include "sun_nio_ch_FileDispatcherImpl.h"
  35 #include "java_lang_Long.h"
  36 #include <sys/types.h>
  37 #include <sys/socket.h>
  38 #include <fcntl.h>
  39 #include <sys/uio.h>
  40 #include <unistd.h>
  41 #if defined(__linux__)
  42 #include <linux/fs.h>
  43 #include <sys/ioctl.h>
  44 #endif
  45 #include "nio.h"
  46 #include "nio_util.h"
  47 
  48 #ifdef _ALLBSD_SOURCE
  49 #define stat64 stat


 160          * reading results in an error ("EBADF: The FileDescriptor parameter is
 161          * not a valid file descriptor open for writing.").
 162          * However, at this point it is not possibly anymore to read the
 163          * 'writable' attribute of the corresponding file channel so we have to
 164          * use 'fcntl'.
 165          */
 166         int getfl = fcntl(fd, F_GETFL);
 167         if (getfl >= 0 && (getfl & O_ACCMODE) == O_RDONLY) {
 168             return 0;
 169         }
 170 #endif
 171         result = fsync(fd);
 172     }
 173     return handle(env, result, "Force failed");
 174 }
 175 
 176 JNIEXPORT jint JNICALL
 177 Java_sun_nio_ch_FileDispatcherImpl_truncate0(JNIEnv *env, jobject this,
 178                                              jobject fdo, jlong size)
 179 {
 180     return handle(env,
 181                   ftruncate64(fdval(env, fdo), size),
 182                   "Truncation failed");
 183 }
 184 
 185 JNIEXPORT jint JNICALL
 186 Java_sun_nio_ch_FileDispatcherImpl_allocate0(JNIEnv *env, jobject this,
 187                                              jobject fdo, jlong size)
 188 {
 189 #if defined(__linux__)
 190     /*
 191      * On Linux, if the file size is being increased, then ftruncate64()
 192      * will modify the metadata value of the size without actually allocating
 193      * any blocks which can cause a SIGBUS error if the file is subsequently
 194      * memory-mapped.
 195      */
 196     // Return on success or if errno is neither EOPNOTSUPP nor ENOSYS
 197     int result = posix_fallocate(fdval(env, fdo), 0, size);
 198     if (result == 0) {
 199         return 0;
 200     } else if (errno != EOPNOTSUPP && errno != ENOSYS) {
 201         return handle(env, result, "Allocation failed");
 202     }
 203 #endif
 204     return handle(env,
 205                   ftruncate64(fdval(env, fdo), size),
 206                   "Truncation failed");
 207 }
 208 
 209 JNIEXPORT jlong JNICALL
 210 Java_sun_nio_ch_FileDispatcherImpl_size0(JNIEnv *env, jobject this, jobject fdo)
 211 {
 212     jint fd = fdval(env, fdo);
 213     struct stat64 fbuf;
 214 
 215     if (fstat64(fd, &fbuf) < 0)
 216         return handle(env, -1, "Size failed");
 217 
 218 #ifdef BLKGETSIZE64
 219     if (S_ISBLK(fbuf.st_mode)) {
 220         uint64_t size;
 221         if (ioctl(fd, BLKGETSIZE64, &size) < 0)
 222             return handle(env, -1, "Size failed");
 223         return (jlong)size;


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