Package java.io

Class FileDescriptor

java.lang.Object
java.io.FileDescriptor
public final class FileDescriptor
extends Object
Wraps a Unix file descriptor. It's possible to get the file descriptor used by some classes (such as FileInputStream, FileOutputStream, and RandomAccessFile), and then create new streams that point to the same file descriptor.

  • Field Summary

    Fields
    Modifier and Type Field Description
    static FileDescriptor err
    Corresponds to stderr.
    static FileDescriptor in
    Corresponds to stdin.
    static FileDescriptor out
    Corresponds to stdout.

  • Constructor Summary

    Constructors
    Constructor Description
    FileDescriptor()
    Constructs a new invalid FileDescriptor.

  • Method Summary

    Modifier and Type Method Description
    int getInt$()
    Returns the int fd.
    void setInt$​(int fd)
    Sets the int fd.
    void sync()
    Ensures that data which is buffered within the underlying implementation is written out to the appropriate device before returning.
    String toString()
    Returns a string containing a concise, human-readable description of this object.
    boolean valid()
    Tests whether this FileDescriptor is valid.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

  • Field Details

  • Constructor Details

    • FileDescriptor

      public FileDescriptor()
      Constructs a new invalid FileDescriptor.

  • Method Details

    • sync

      public void sync() throws SyncFailedException
      Ensures that data which is buffered within the underlying implementation is written out to the appropriate device before returning.
      Throws:
      SyncFailedException

    • valid

      public boolean valid()
      Tests whether this FileDescriptor is valid.

    • getInt$

      public final int getInt$()
      Returns the int fd. It's highly unlikely you should be calling this. Please discuss your needs with a libcore maintainer before using this method.

    • setInt$

      public final void setInt$​(int fd)
      Sets the int fd. It's highly unlikely you should be calling this. Please discuss your needs with a libcore maintainer before using this method.

    • toString

      public String toString()
      Description copied from class: Object
      Returns a string containing a concise, human-readable description of this object. Subclasses are encouraged to override this method and provide an implementation that takes into account the object's type and data. The default implementation is equivalent to the following expression: 
         getClass().getName() + '@' + Integer.toHexString(hashCode())

      See Writing a useful toString method if you intend implementing your own toString method.

      Overrides:
      toString in class Object
      Returns:
      a printable representation of this object.