FileDescriptor (GNU Classpath 0.94-pre Documentation)

Class FileDescriptor

public final class FileDescriptor extends Object

This class represents an opaque file handle as a Java class. It should be used only to pass to other methods that expect an object of this type. No system specific information can be obtained from this object.

UNKNOWN: September 24, 1998

Field Summary
static FileDescriptor	err A `FileDescriptor` representing the system standard error stream.
static FileDescriptor	in A `FileDescriptor` representing the system standard input stream.
static FileDescriptor	out A `FileDescriptor` representing the system standard output stream.

Field Summary

static FileDescriptor

err

A FileDescriptor representing the system standard error stream.

static FileDescriptor

A FileDescriptor representing the system standard input stream.

static FileDescriptor

out

A FileDescriptor representing the system standard output stream.

Constructor Summary
	FileDescriptor() This method is used to initialize an invalid FileDescriptor object.

Constructor Summary

FileDescriptor()

This method is used to initialize an invalid FileDescriptor object.

Method Summary
void	sync() This method forces all data that has not yet been physically written to the underlying storage medium associated with this `FileDescriptor` to be written out.
boolean	valid() This methods tests whether or not this object represents a valid open native file handle.

Method Summary

void

sync()

This method forces all data that has not yet been physically written to the underlying storage medium associated with this FileDescriptor to be written out.

boolean

valid()

This methods tests whether or not this object represents a valid open native file handle.

Field Detail

err

A FileDescriptor representing the system standard error stream. This will usually be accessed through the System.errvariable.

A FileDescriptor representing the system standard input stream. This will usually be accessed through the System.invariable.

out

A FileDescriptor representing the system standard output stream. This will usually be accessed through the System.outvariable.

Constructor Detail

FileDescriptor

This method is used to initialize an invalid FileDescriptor object.

Method Detail

sync

This method forces all data that has not yet been physically written to the underlying storage medium associated with this FileDescriptor to be written out. This method will not return until all data has been fully written to the underlying device. If the device does not support this functionality or if an error occurs, then an exception will be thrown.

valid

This methods tests whether or not this object represents a valid open native file handle.

Returns: true if this object represents a valid native file handle, false otherwise