mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-19 13:09:37 +08:00
1d5c46dc84
* java/io/FileDescriptor.java (position): New private field.
* java/io/natFileDescriptorPosix.cc (write): Up position.
(setLength): Use and set position.
(seek): Set position.
(getFilePointer): Return position.
(read): Up position.
From-SVN: r60869
107 lines
3.2 KiB
Java
107 lines
3.2 KiB
Java
// FileDescriptor.java - Open file or device
|
|
|
|
/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation
|
|
|
|
This file is part of libgcj.
|
|
|
|
This software is copyrighted work licensed under the terms of the
|
|
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
|
|
details. */
|
|
|
|
package java.io;
|
|
|
|
/**
|
|
* @author Tom Tromey <tromey@cygnus.com>
|
|
* @date September 24, 1998
|
|
*/
|
|
|
|
/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
|
|
* "The Java Language Specification", ISBN 0-201-63451-1
|
|
* Status: Complete to 1.1
|
|
*/
|
|
|
|
// For now we assume a POSIXy file system. This can be changed later
|
|
// if need be.
|
|
public final class FileDescriptor
|
|
{
|
|
|
|
public static final FileDescriptor in = null;
|
|
public static final FileDescriptor out = null;
|
|
public static final FileDescriptor err = null;
|
|
|
|
private static native void init();
|
|
static
|
|
{
|
|
init();
|
|
}
|
|
|
|
public native void sync () throws SyncFailedException;
|
|
public native boolean valid ();
|
|
|
|
// These are mode values for open().
|
|
static final int READ = 1;
|
|
static final int WRITE = 2;
|
|
static final int APPEND = 4;
|
|
// EXCL is used only when making a temp file.
|
|
static final int EXCL = 8;
|
|
|
|
// These are WHENCE values for seek.
|
|
static final int SET = 0;
|
|
static final int CUR = 1;
|
|
|
|
// This constructor is specified to create an invalid descriptor.
|
|
public FileDescriptor ()
|
|
{
|
|
}
|
|
|
|
// Open a file. MODE is a combination of the above mode flags.
|
|
FileDescriptor (String path, int mode) throws FileNotFoundException
|
|
{
|
|
fd = open (path, mode);
|
|
}
|
|
|
|
native int open (String path, int mode) throws FileNotFoundException;
|
|
native void write (int b) throws IOException;
|
|
native void write (byte[] b, int offset, int len)
|
|
throws IOException, NullPointerException, IndexOutOfBoundsException;
|
|
native void close () throws IOException;
|
|
native void setLength (long pos) throws IOException;
|
|
// EOF_TRUNC is true if a request to seek past the end of file
|
|
// should actually stop at the end of file. If false, then a seek
|
|
// past the end is ok (and if a subsequent write occurs the file
|
|
// will grow).
|
|
native int seek (long pos, int whence, boolean eof_trunc) throws IOException;
|
|
native long length () throws IOException;
|
|
native long getFilePointer () throws IOException;
|
|
native int read () throws IOException;
|
|
native int read (byte[] bytes, int offset, int len) throws IOException;
|
|
native int available () throws IOException;
|
|
|
|
|
|
// When collected, close.
|
|
protected void finalize () throws IOException
|
|
{
|
|
if (valid ())
|
|
close ();
|
|
}
|
|
|
|
// Attach to an already-opened file. This is not private because we
|
|
// need access to it from other packages, for instance java.net.
|
|
// Ordinarily that wouldn't work, either, but in our case we know
|
|
// the access comes from C++, where "package private" is translated
|
|
// into "public". Eww.
|
|
FileDescriptor (int desc)
|
|
{
|
|
fd = desc;
|
|
}
|
|
|
|
// System's notion of file descriptor. It might seem redundant to
|
|
// initialize this given that it is reassigned in the constructors.
|
|
// However, this is necessary because if open() throws an exception
|
|
// we want to make sure this has the value -1. This is the most
|
|
// efficient way to accomplish that.
|
|
private int fd = -1;
|
|
|
|
private long position = 0;
|
|
}
|