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Uses of Class
java.io.FileDescriptor

• Packages that useFileDescriptor 

  Package	Description
  java.io	Provides for system input and output through data streams, serialization and the file system.
  java.lang	Provides classes that are fundamental to the design of the Java programming language.
  java.net	Provides the classes for implementing networking applications.
  jdk.nio	Defines JDK-specificchannel APIs.

• • Uses ofFileDescriptor injava.io

    Fields injava.io declared asFileDescriptor 

    Modifier and Type	Field	Description
    staticFileDescriptor	FileDescriptor.err	A handle to the standard error stream.
    staticFileDescriptor	FileDescriptor.in	A handle to the standard input stream.
    staticFileDescriptor	FileDescriptor.out	A handle to the standard output stream.

    Methods injava.io that returnFileDescriptor 

    Modifier and Type	Method	Description
    FileDescriptor	FileInputStream.getFD()	Returns theFileDescriptor object that represents the connection to the actual file in the file system being used by thisFileInputStream.
    FileDescriptor	FileOutputStream.getFD()	Returns the file descriptor associated with this stream.
    FileDescriptor	RandomAccessFile.getFD()	Returns the opaque file descriptor object associated with this stream.

    Constructors injava.io with parameters of typeFileDescriptor 

    Constructor	Description
    FileInputStream​(FileDescriptor fdObj)	Creates aFileInputStream by using the file descriptorfdObj, which represents an existing connection to an actual file in the file system.
    FileOutputStream​(FileDescriptor fdObj)	Creates a file output stream to write to the specified file descriptor, which represents an existing connection to an actual file in the file system.
    FileReader​(FileDescriptor fd)	Creates a newFileReader, given theFileDescriptor to read, using the platform'sdefault charset.
    FileWriter​(FileDescriptor fd)	Constructs aFileWriter given a file descriptor, using the platform'sdefault charset.

  • Uses ofFileDescriptor injava.lang

    Methods injava.lang with parameters of typeFileDescriptor 

    Modifier and Type	Method	Description
    void	SecurityManager.checkRead​(FileDescriptor fd)	Throws aSecurityException if the calling thread is not allowed to read from the specified file descriptor.
    void	SecurityManager.checkWrite​(FileDescriptor fd)	Throws aSecurityException if the calling thread is not allowed to write to the specified file descriptor.

  • Uses ofFileDescriptor injava.net

    Fields injava.net declared asFileDescriptor 

    Modifier and Type	Field	Description
    protectedFileDescriptor	DatagramSocketImpl.fd	The file descriptor object.
    protectedFileDescriptor	SocketImpl.fd	The file descriptor object for this socket.

    Methods injava.net that returnFileDescriptor 

    Modifier and Type	Method	Description
    protectedFileDescriptor	DatagramSocketImpl.getFileDescriptor()	Gets the datagram socket file descriptor.
    protectedFileDescriptor	SocketImpl.getFileDescriptor()	Returns the value of this socket'sfd field.

  • Uses ofFileDescriptor injdk.nio

    Methods injdk.nio with parameters of typeFileDescriptor 

    Modifier and Type	Method	Description
    staticSelectableChannel	Channels.readWriteSelectableChannel​(FileDescriptor fd,Channels.SelectableChannelCloser closer)	Creates a selectable channel to a file descriptor that supports anoperation-set ofOP_READ andOP_WRITE.