org.apache.hadoop.io.nativeio
Class NativeIO

java.lang.Object
  org.apache.hadoop.io.nativeio.NativeIO

public class NativeIO
extends Object

JNI wrappers for various native IO-related calls not available in Java. These functions should generally be used alongside a fallback to another more portable mechanism.

Nested Class Summary

static class

NativeIO.Stat Result type of the fstat call

Field Summary

static int	O_APPEND
static int	O_ASYNC
static int	O_CREAT
static int	O_EXCL
static int	O_FSYNC
static int	O_NDELAY
static int	O_NOCTTY
static int	O_NONBLOCK
static int	O_RDONLY
static int	O_RDWR
static int	O_SYNC
static int	O_TRUNC
static int	O_WRONLY

Constructor Summary

NativeIO()

Method Summary

static void	chmod(String path, int mode) Wrapper around chmod(2)
static NativeIO.Stat	fstat(FileDescriptor fd) Wrapper around fstat(2)
static String	getOwner(FileDescriptor fd)
static boolean	isAvailable() Return true if the JNI-based native IO extensions are available.
static FileDescriptor	open(String path, int flags, int mode) Wrapper around open(2)

Methods inherited from class java.lang.Object

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

Field Detail

O_RDONLY

public static final int O_RDONLY

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Constant Field Values

O_WRONLY

public static final int O_WRONLY

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Constant Field Values

O_RDWR

public static final int O_RDWR

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Constant Field Values

O_CREAT

public static final int O_CREAT

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Constant Field Values

O_EXCL

public static final int O_EXCL

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Constant Field Values

O_NOCTTY

public static final int O_NOCTTY

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Constant Field Values

O_TRUNC

public static final int O_TRUNC

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Constant Field Values

O_APPEND

public static final int O_APPEND

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Constant Field Values

O_NONBLOCK

public static final int O_NONBLOCK

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Constant Field Values

O_SYNC

public static final int O_SYNC

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Constant Field Values

O_ASYNC

public static final int O_ASYNC

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Constant Field Values

O_FSYNC

public static final int O_FSYNC

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Constant Field Values

O_NDELAY

public static final int O_NDELAY

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Constant Field Values

Constructor Detail

NativeIO

public NativeIO()

Method Detail

isAvailable

public static boolean isAvailable()

Return true if the JNI-based native IO extensions are available.

open

public static FileDescriptor open(String path,
                                  int flags,
                                  int mode)
                           throws IOException

Wrapper around open(2)

Throws:

IOException

fstat

public static NativeIO.Stat fstat(FileDescriptor fd)
                           throws IOException

Wrapper around fstat(2)

Throws:

IOException

chmod

public static void chmod(String path,
                         int mode)
                  throws IOException

Wrapper around chmod(2)

Throws:

IOException

getOwner

public static String getOwner(FileDescriptor fd)
                       throws IOException

Throws:

IOException