Initial revision

From-SVN: r26263
1999-04-07 14:42:40 +00:00
parent 140fa895c6
commit ee9dd3721b
370 changed files with 173494 additions and 0 deletions
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+// FileDescriptor.java - Open file or device
+
+/* Copyright (C) 1998, 1999  Cygnus Solutions
+
+   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 = new FileDescriptor (0);
+  public static final FileDescriptor out = new FileDescriptor (1);
+  public static final FileDescriptor err = new FileDescriptor (2);
+
+  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;
+
+  // These are WHENCE values for seek.
+  static final int SET = 0;
+  static final int CUR = 1;
+
+  // Open a file.  MODE is a combination of the above mode flags.
+  FileDescriptor (String path, int mode) throws IOException
+  {
+    fd = open (path, mode);
+  }
+
+  public FileDescriptor ()
+  {
+    fd = -1;
+  }
+
+  native int open (String path, int mode) throws IOException;
+  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 int seek (long pos, int whence) 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.
+  private int fd;
+}