This documentation differs from the official API.
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java.io
class FileDescriptor
-
Most common way to construct:
-
FileDescriptor stderr_fd = new FileDescriptor();
Based on 9 examples
public final class FileDescriptor
extends Object
Instances of the file descriptor class serve as an opaque handle
to the underlying machine-specific structure representing an open
file, an open socket, or another source or sink of bytes. The
main practical use for a file descriptor is to create a
FileInputStream or FileOutputStream to
contain it.
Applications should not create their own file descriptors.
- See Also (auto-generated):
-
RandomAccessFile
FileInputStream
FileOutputStream
| Constructor Summary |
Constructs an (invalid) FileDescriptor
object.
|
| Method Summary |
native void |
Force all system buffers to synchronize with the underlying
device.
|
boolean |
Tests if this file descriptor object is valid.
|
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
err
public static final FileDescriptor err
-
A handle to the standard error stream. Usually, this file
descriptor is not used directly, but rather via the output stream
known as
System.err.
in
public static final FileDescriptor in
-
A handle to the standard input stream. Usually, this file
descriptor is not used directly, but rather via the input stream
known as
System.in.
out
public static final FileDescriptor out
-
A handle to the standard output stream. Usually, this file
descriptor is not used directly, but rather via the output stream
known as
System.out.
FileDescriptor
public FileDescriptor()
-
Constructs an (invalid) FileDescriptor
object.
sync
public native void sync()
throws SyncFailedException
-
Force all system buffers to synchronize with the underlying
device. This method returns after all modified data and
attributes of this FileDescriptor have been written to the
relevant device(s). In particular, if this FileDescriptor
refers to a physical storage medium, such as a file in a file
system, sync will not return until all in-memory modified copies
of buffers associated with this FileDesecriptor have been
written to the physical medium.
sync is meant to be used by code that requires physical
storage (such as a file) to be in a known state For
example, a class that provided a simple transaction facility
might use sync to ensure that all changes to a file caused
by a given transaction were recorded on a storage medium.
sync only affects buffers downstream of this FileDescriptor. If
any in-memory buffering is being done by the application (for
example, by a BufferedOutputStream object), those buffers must
be flushed into the FileDescriptor (for example, by invoking
OutputStream.flush) before that data will be affected by sync.
- Throws:
SyncFailedException - Thrown when the buffers cannot be flushed,
or because the system cannot guarantee that all the
buffers have been synchronized with physical media.
valid
public boolean valid()
-
Tests if this file descriptor object is valid.
- Returns:
true if the file descriptor object represents a
valid, open file, socket, or other active I/O connection;
false otherwise.
This documentation differs from the official API.
Jadeite adds
extra features to the API including:
variable font sizes,
constructions examples,
placeholders for classes and methods, and auto-generated “See Also” links.
Additionally it
is missing some items found in standard Javadoc documentation, including:
generics type information,
“Deprecated” tags and comments,
“See Also” links,
along with other minor differences.
Please send any questions or feedback to
bam@cs.cmu.edu.
This page displays the
Jadeite version of the documention, which is derived from the offical documentation that contains this copyright notice:
The official Sun™ documentation can be found here at
http://java.sun.com/javase/6/docs/api/.
java.io.FileDescriptor