```
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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`getInt$()`	Returns the int fd.
`boolean`	`isSocket$()`
`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 Detail
  - in
```
public static final FileDescriptor in
```
    Corresponds to stdin.
  - out
```
public static final FileDescriptor out
```
    Corresponds to stdout.
  - err
```
public static final FileDescriptor err
```
    Corresponds to stderr.
- Constructor Detail
  - FileDescriptor
```
public FileDescriptor()
```
    Constructs a new invalid FileDescriptor.
- Method Detail
  - 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$(int fd)
```
    Sets the int fd. It's highly unlikely you should be calling this. Please discuss your needs with a libcore maintainer before using this method.
  - isSocket$
```
public final boolean isSocket$()
```
  - 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.

Class FileDescriptor

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

in

out

err

Constructor Detail

FileDescriptor

Method Detail

sync

valid

getInt$

setInt$

isSocket$

toString