| /* |
| * Copyright (c) 2000, 2017, 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 "jni.h" |
| #include "jni_util.h" |
| #include "jvm.h" |
| #include "jlong.h" |
| #include "sun_nio_ch_FileDispatcherImpl.h" |
| #include "java_lang_Long.h" |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <fcntl.h> |
| #include <sys/uio.h> |
| #include <unistd.h> |
| #if defined(__linux__) |
| #include <linux/fs.h> |
| #include <sys/ioctl.h> |
| #endif |
| #include "nio.h" |
| #include "nio_util.h" |
| |
| #ifdef _ALLBSD_SOURCE |
| #define stat64 stat |
| #define flock64 flock |
| #define off64_t off_t |
| #define F_SETLKW64 F_SETLKW |
| #define F_SETLK64 F_SETLK |
| |
| #define pread64 pread |
| #define pwrite64 pwrite |
| #define ftruncate64 ftruncate |
| #define fstat64 fstat |
| |
| #define fdatasync fsync |
| #endif |
| |
| 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_FileDispatcherImpl_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_FileDispatcherImpl_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_FileDispatcherImpl_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_FileDispatcherImpl_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); |
| return convertLongReturnVal(env, readv(fd, iov, len), JNI_TRUE); |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_FileDispatcherImpl_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_FileDispatcherImpl_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_FileDispatcherImpl_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); |
| return convertLongReturnVal(env, writev(fd, iov, len), JNI_FALSE); |
| } |
| |
| static jlong |
| handle(JNIEnv *env, jlong rv, char *msg) |
| { |
| if (rv >= 0) |
| return rv; |
| if (errno == EINTR) |
| return IOS_INTERRUPTED; |
| JNU_ThrowIOExceptionWithLastError(env, msg); |
| return IOS_THROWN; |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_FileDispatcherImpl_force0(JNIEnv *env, jobject this, |
| jobject fdo, jboolean md) |
| { |
| jint fd = fdval(env, fdo); |
| int result = 0; |
| |
| #ifdef MACOSX |
| result = fcntl(fd, F_FULLFSYNC); |
| if (result == -1 && errno == ENOTSUP) { |
| /* Try fsync() in case F_FULLSYUNC is not implemented on the file system. */ |
| result = fsync(fd); |
| } |
| #else /* end MACOSX, begin not-MACOSX */ |
| if (md == JNI_FALSE) { |
| result = fdatasync(fd); |
| } else { |
| #ifdef _AIX |
| /* On AIX, calling fsync on a file descriptor that is opened only for |
| * reading results in an error ("EBADF: The FileDescriptor parameter is |
| * not a valid file descriptor open for writing."). |
| * However, at this point it is not possibly anymore to read the |
| * 'writable' attribute of the corresponding file channel so we have to |
| * use 'fcntl'. |
| */ |
| int getfl = fcntl(fd, F_GETFL); |
| if (getfl >= 0 && (getfl & O_ACCMODE) == O_RDONLY) { |
| return 0; |
| } |
| #endif /* _AIX */ |
| result = fsync(fd); |
| } |
| #endif /* not-MACOSX */ |
| return handle(env, result, "Force failed"); |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_FileDispatcherImpl_truncate0(JNIEnv *env, jobject this, |
| jobject fdo, jlong size) |
| { |
| return handle(env, |
| ftruncate64(fdval(env, fdo), size), |
| "Truncation failed"); |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_FileDispatcherImpl_allocate0(JNIEnv *env, jobject this, |
| jobject fdo, jlong size) |
| { |
| #if defined(__linux__) |
| /* |
| * On Linux, if the file size is being increased, then ftruncate64() |
| * will modify the metadata value of the size without actually allocating |
| * any blocks which can cause a SIGBUS error if the file is subsequently |
| * memory-mapped. |
| */ |
| // Return on success or if errno is neither EOPNOTSUPP nor ENOSYS |
| int result = fallocate64(fdval(env, fdo), 0, 0, size); |
| if (result == 0) { |
| return 0; |
| } else if (errno != EOPNOTSUPP && errno != ENOSYS) { |
| return handle(env, result, "Allocation failed"); |
| } |
| #endif |
| return handle(env, |
| ftruncate64(fdval(env, fdo), size), |
| "Truncation failed"); |
| } |
| |
| JNIEXPORT jlong JNICALL |
| Java_sun_nio_ch_FileDispatcherImpl_size0(JNIEnv *env, jobject this, jobject fdo) |
| { |
| jint fd = fdval(env, fdo); |
| struct stat64 fbuf; |
| |
| if (fstat64(fd, &fbuf) < 0) |
| return handle(env, -1, "Size failed"); |
| |
| #ifdef BLKGETSIZE64 |
| if (S_ISBLK(fbuf.st_mode)) { |
| uint64_t size; |
| if (ioctl(fd, BLKGETSIZE64, &size) < 0) |
| return handle(env, -1, "Size failed"); |
| return (jlong)size; |
| } |
| #endif |
| |
| return fbuf.st_size; |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_FileDispatcherImpl_lock0(JNIEnv *env, jobject this, jobject fdo, |
| jboolean block, jlong pos, jlong size, |
| jboolean shared) |
| { |
| jint fd = fdval(env, fdo); |
| jint lockResult = 0; |
| int cmd = 0; |
| struct flock64 fl; |
| |
| fl.l_whence = SEEK_SET; |
| if (size == (jlong)java_lang_Long_MAX_VALUE) { |
| fl.l_len = (off64_t)0; |
| } else { |
| fl.l_len = (off64_t)size; |
| } |
| fl.l_start = (off64_t)pos; |
| if (shared == JNI_TRUE) { |
| fl.l_type = F_RDLCK; |
| } else { |
| fl.l_type = F_WRLCK; |
| } |
| if (block == JNI_TRUE) { |
| cmd = F_SETLKW64; |
| } else { |
| cmd = F_SETLK64; |
| } |
| lockResult = fcntl(fd, cmd, &fl); |
| if (lockResult < 0) { |
| if ((cmd == F_SETLK64) && (errno == EAGAIN || errno == EACCES)) |
| return sun_nio_ch_FileDispatcherImpl_NO_LOCK; |
| if (errno == EINTR) |
| return sun_nio_ch_FileDispatcherImpl_INTERRUPTED; |
| JNU_ThrowIOExceptionWithLastError(env, "Lock failed"); |
| } |
| return 0; |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_sun_nio_ch_FileDispatcherImpl_release0(JNIEnv *env, jobject this, |
| jobject fdo, jlong pos, jlong size) |
| { |
| jint fd = fdval(env, fdo); |
| jint lockResult = 0; |
| struct flock64 fl; |
| int cmd = F_SETLK64; |
| |
| fl.l_whence = SEEK_SET; |
| if (size == (jlong)java_lang_Long_MAX_VALUE) { |
| fl.l_len = (off64_t)0; |
| } else { |
| fl.l_len = (off64_t)size; |
| } |
| fl.l_start = (off64_t)pos; |
| fl.l_type = F_UNLCK; |
| lockResult = fcntl(fd, cmd, &fl); |
| if (lockResult < 0) { |
| JNU_ThrowIOExceptionWithLastError(env, "Release failed"); |
| } |
| } |
| |
| |
| 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_FileDispatcherImpl_close0(JNIEnv *env, jclass clazz, jobject fdo) |
| { |
| jint fd = fdval(env, fdo); |
| closeFileDescriptor(env, fd); |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_sun_nio_ch_FileDispatcherImpl_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_FileDispatcherImpl_closeIntFD(JNIEnv *env, jclass clazz, jint fd) |
| { |
| closeFileDescriptor(env, fd); |
| } |