Java example source code file (UnixNativeDispatcher.java)
The UnixNativeDispatcher.java Java example source code/*
* Copyright (c) 2008, 2013, 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.
*/
package sun.nio.fs;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* Unix system and library calls.
*/
class UnixNativeDispatcher {
protected UnixNativeDispatcher() { }
// returns a NativeBuffer containing the given path
private static NativeBuffer copyToNativeBuffer(UnixPath path) {
byte[] cstr = path.getByteArrayForSysCalls();
int size = cstr.length + 1;
NativeBuffer buffer = NativeBuffers.getNativeBufferFromCache(size);
if (buffer == null) {
buffer = NativeBuffers.allocNativeBuffer(size);
} else {
// buffer already contains the path
if (buffer.owner() == path)
return buffer;
}
NativeBuffers.copyCStringToNativeBuffer(cstr, buffer);
buffer.setOwner(path);
return buffer;
}
/**
* char *getcwd(char *buf, size_t size);
*/
static native byte[] getcwd();
/**
* int dup(int filedes)
*/
static native int dup(int filedes) throws UnixException;
/**
* int open(const char* path, int oflag, mode_t mode)
*/
static int open(UnixPath path, int flags, int mode) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
return open0(buffer.address(), flags, mode);
} finally {
buffer.release();
}
}
private static native int open0(long pathAddress, int flags, int mode)
throws UnixException;
/**
* int openat(int dfd, const char* path, int oflag, mode_t mode)
*/
static int openat(int dfd, byte[] path, int flags, int mode) throws UnixException {
NativeBuffer buffer = NativeBuffers.asNativeBuffer(path);
try {
return openat0(dfd, buffer.address(), flags, mode);
} finally {
buffer.release();
}
}
private static native int openat0(int dfd, long pathAddress, int flags, int mode)
throws UnixException;
/**
* close(int filedes)
*/
static native void close(int fd);
/**
* FILE* fopen(const char *filename, const char* mode);
*/
static long fopen(UnixPath filename, String mode) throws UnixException {
NativeBuffer pathBuffer = copyToNativeBuffer(filename);
NativeBuffer modeBuffer = NativeBuffers.asNativeBuffer(Util.toBytes(mode));
try {
return fopen0(pathBuffer.address(), modeBuffer.address());
} finally {
modeBuffer.release();
pathBuffer.release();
}
}
private static native long fopen0(long pathAddress, long modeAddress)
throws UnixException;
/**
* fclose(FILE* stream)
*/
static native void fclose(long stream) throws UnixException;
/**
* link(const char* existing, const char* new)
*/
static void link(UnixPath existing, UnixPath newfile) throws UnixException {
NativeBuffer existingBuffer = copyToNativeBuffer(existing);
NativeBuffer newBuffer = copyToNativeBuffer(newfile);
try {
link0(existingBuffer.address(), newBuffer.address());
} finally {
newBuffer.release();
existingBuffer.release();
}
}
private static native void link0(long existingAddress, long newAddress)
throws UnixException;
/**
* unlink(const char* path)
*/
static void unlink(UnixPath path) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
unlink0(buffer.address());
} finally {
buffer.release();
}
}
private static native void unlink0(long pathAddress) throws UnixException;
/**
* unlinkat(int dfd, const char* path, int flag)
*/
static void unlinkat(int dfd, byte[] path, int flag) throws UnixException {
NativeBuffer buffer = NativeBuffers.asNativeBuffer(path);
try {
unlinkat0(dfd, buffer.address(), flag);
} finally {
buffer.release();
}
}
private static native void unlinkat0(int dfd, long pathAddress, int flag)
throws UnixException;
/**
* mknod(const char* path, mode_t mode, dev_t dev)
*/
static void mknod(UnixPath path, int mode, long dev) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
mknod0(buffer.address(), mode, dev);
} finally {
buffer.release();
}
}
private static native void mknod0(long pathAddress, int mode, long dev)
throws UnixException;
/**
* rename(const char* old, const char* new)
*/
static void rename(UnixPath from, UnixPath to) throws UnixException {
NativeBuffer fromBuffer = copyToNativeBuffer(from);
NativeBuffer toBuffer = copyToNativeBuffer(to);
try {
rename0(fromBuffer.address(), toBuffer.address());
} finally {
toBuffer.release();
fromBuffer.release();
}
}
private static native void rename0(long fromAddress, long toAddress)
throws UnixException;
/**
* renameat(int fromfd, const char* old, int tofd, const char* new)
*/
static void renameat(int fromfd, byte[] from, int tofd, byte[] to) throws UnixException {
NativeBuffer fromBuffer = NativeBuffers.asNativeBuffer(from);
NativeBuffer toBuffer = NativeBuffers.asNativeBuffer(to);
try {
renameat0(fromfd, fromBuffer.address(), tofd, toBuffer.address());
} finally {
toBuffer.release();
fromBuffer.release();
}
}
private static native void renameat0(int fromfd, long fromAddress, int tofd, long toAddress)
throws UnixException;
/**
* mkdir(const char* path, mode_t mode)
*/
static void mkdir(UnixPath path, int mode) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
mkdir0(buffer.address(), mode);
} finally {
buffer.release();
}
}
private static native void mkdir0(long pathAddress, int mode) throws UnixException;
/**
* rmdir(const char* path)
*/
static void rmdir(UnixPath path) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
rmdir0(buffer.address());
} finally {
buffer.release();
}
}
private static native void rmdir0(long pathAddress) throws UnixException;
/**
* readlink(const char* path, char* buf, size_t bufsize)
*
* @return link target
*/
static byte[] readlink(UnixPath path) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
return readlink0(buffer.address());
} finally {
buffer.release();
}
}
private static native byte[] readlink0(long pathAddress) throws UnixException;
/**
* realpath(const char* path, char* resolved_name)
*
* @return resolved path
*/
static byte[] realpath(UnixPath path) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
return realpath0(buffer.address());
} finally {
buffer.release();
}
}
private static native byte[] realpath0(long pathAddress) throws UnixException;
/**
* symlink(const char* name1, const char* name2)
*/
static void symlink(byte[] name1, UnixPath name2) throws UnixException {
NativeBuffer targetBuffer = NativeBuffers.asNativeBuffer(name1);
NativeBuffer linkBuffer = copyToNativeBuffer(name2);
try {
symlink0(targetBuffer.address(), linkBuffer.address());
} finally {
linkBuffer.release();
targetBuffer.release();
}
}
private static native void symlink0(long name1, long name2)
throws UnixException;
/**
* stat(const char* path, struct stat* buf)
*/
static void stat(UnixPath path, UnixFileAttributes attrs) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
stat0(buffer.address(), attrs);
} finally {
buffer.release();
}
}
private static native void stat0(long pathAddress, UnixFileAttributes attrs)
throws UnixException;
/**
* lstat(const char* path, struct stat* buf)
*/
static void lstat(UnixPath path, UnixFileAttributes attrs) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
lstat0(buffer.address(), attrs);
} finally {
buffer.release();
}
}
private static native void lstat0(long pathAddress, UnixFileAttributes attrs)
throws UnixException;
/**
* fstat(int filedes, struct stat* buf)
*/
static native void fstat(int fd, UnixFileAttributes attrs) throws UnixException;
/**
* fstatat(int filedes,const char* path, struct stat* buf, int flag)
*/
static void fstatat(int dfd, byte[] path, int flag, UnixFileAttributes attrs)
throws UnixException
{
NativeBuffer buffer = NativeBuffers.asNativeBuffer(path);
try {
fstatat0(dfd, buffer.address(), flag, attrs);
} finally {
buffer.release();
}
}
private static native void fstatat0(int dfd, long pathAddress, int flag,
UnixFileAttributes attrs) throws UnixException;
/**
* chown(const char* path, uid_t owner, gid_t group)
*/
static void chown(UnixPath path, int uid, int gid) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
chown0(buffer.address(), uid, gid);
} finally {
buffer.release();
}
}
private static native void chown0(long pathAddress, int uid, int gid)
throws UnixException;
/**
* lchown(const char* path, uid_t owner, gid_t group)
*/
static void lchown(UnixPath path, int uid, int gid) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
lchown0(buffer.address(), uid, gid);
} finally {
buffer.release();
}
}
private static native void lchown0(long pathAddress, int uid, int gid)
throws UnixException;
/**
* fchown(int filedes, uid_t owner, gid_t group)
*/
static native void fchown(int fd, int uid, int gid) throws UnixException;
/**
* chmod(const char* path, mode_t mode)
*/
static void chmod(UnixPath path, int mode) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
chmod0(buffer.address(), mode);
} finally {
buffer.release();
}
}
private static native void chmod0(long pathAddress, int mode)
throws UnixException;
/**
* fchmod(int fildes, mode_t mode)
*/
static native void fchmod(int fd, int mode) throws UnixException;
/**
* utimes(conar char* path, const struct timeval times[2])
*/
static void utimes(UnixPath path, long times0, long times1)
throws UnixException
{
NativeBuffer buffer = copyToNativeBuffer(path);
try {
utimes0(buffer.address(), times0, times1);
} finally {
buffer.release();
}
}
private static native void utimes0(long pathAddress, long times0, long times1)
throws UnixException;
/**
* futimes(int fildes,, const struct timeval times[2])
*/
static native void futimes(int fd, long times0, long times1) throws UnixException;
/**
* DIR *opendir(const char* dirname)
*/
static long opendir(UnixPath path) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
return opendir0(buffer.address());
} finally {
buffer.release();
}
}
private static native long opendir0(long pathAddress) throws UnixException;
/**
* DIR* fdopendir(int filedes)
*/
static native long fdopendir(int dfd) throws UnixException;
/**
* closedir(DIR* dirp)
*/
static native void closedir(long dir) throws UnixException;
/**
* struct dirent* readdir(DIR *dirp)
*
* @return dirent->d_name
*/
static native byte[] readdir(long dir) throws UnixException;
/**
* size_t read(int fildes, void* buf, size_t nbyte)
*/
static native int read(int fildes, long buf, int nbyte) throws UnixException;
/**
* size_t writeint fildes, void* buf, size_t nbyte)
*/
static native int write(int fildes, long buf, int nbyte) throws UnixException;
/**
* access(const char* path, int amode);
*/
static void access(UnixPath path, int amode) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
access0(buffer.address(), amode);
} finally {
buffer.release();
}
}
private static native void access0(long pathAddress, int amode) throws UnixException;
/**
* struct passwd *getpwuid(uid_t uid);
*
* @return passwd->pw_name
*/
static native byte[] getpwuid(int uid) throws UnixException;
/**
* struct group *getgrgid(gid_t gid);
*
* @return group->gr_name
*/
static native byte[] getgrgid(int gid) throws UnixException;
/**
* struct passwd *getpwnam(const char *name);
*
* @return passwd->pw_uid
*/
static int getpwnam(String name) throws UnixException {
NativeBuffer buffer = NativeBuffers.asNativeBuffer(Util.toBytes(name));
try {
return getpwnam0(buffer.address());
} finally {
buffer.release();
}
}
private static native int getpwnam0(long nameAddress) throws UnixException;
/**
* struct group *getgrnam(const char *name);
*
* @return group->gr_name
*/
static int getgrnam(String name) throws UnixException {
NativeBuffer buffer = NativeBuffers.asNativeBuffer(Util.toBytes(name));
try {
return getgrnam0(buffer.address());
} finally {
buffer.release();
}
}
private static native int getgrnam0(long nameAddress) throws UnixException;
/**
* statvfs(const char* path, struct statvfs *buf)
*/
static void statvfs(UnixPath path, UnixFileStoreAttributes attrs)
throws UnixException
{
NativeBuffer buffer = copyToNativeBuffer(path);
try {
statvfs0(buffer.address(), attrs);
} finally {
buffer.release();
}
}
private static native void statvfs0(long pathAddress, UnixFileStoreAttributes attrs)
throws UnixException;
/**
* long int pathconf(const char *path, int name);
*/
static long pathconf(UnixPath path, int name) throws UnixException {
NativeBuffer buffer = copyToNativeBuffer(path);
try {
return pathconf0(buffer.address(), name);
} finally {
buffer.release();
}
}
private static native long pathconf0(long pathAddress, int name)
throws UnixException;
/**
* long fpathconf(int fildes, int name);
*/
static native long fpathconf(int filedes, int name) throws UnixException;
/**
* char* strerror(int errnum)
*/
static native byte[] strerror(int errnum);
/**
* Capabilities
*/
private static final int SUPPORTS_OPENAT = 1 << 1; // syscalls
private static final int SUPPORTS_FUTIMES = 1 << 2;
private static final int SUPPORTS_BIRTHTIME = 1 << 16; // other features
private static final int capabilities;
/**
* Supports openat and other *at calls.
*/
static boolean openatSupported() {
return (capabilities & SUPPORTS_OPENAT) != 0;
}
/**
* Supports futimes or futimesat
*/
static boolean futimesSupported() {
return (capabilities & SUPPORTS_FUTIMES) != 0;
}
/**
* Supports file birth (creation) time attribute
*/
static boolean birthtimeSupported() {
return (capabilities & SUPPORTS_BIRTHTIME) != 0;
}
private static native int init();
static {
AccessController.doPrivileged(new PrivilegedAction<Void>() {
public Void run() {
System.loadLibrary("nio");
return null;
}});
capabilities = init();
}
}
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