org.apache.cassandra.utils
Class CLibrary

java.lang.Object
  org.apache.cassandra.utils.CLibrary

public final class CLibrary
extends java.lang.Object

Method Summary

static void	createHardLink(java.io.File sourceFile, java.io.File destinationFile) Create a hard link for a given file.
static int	fcntl(int fd, int command, long flags)
static int	getfd(java.io.FileDescriptor descriptor) Get system file descriptor from FileDescriptor object.
static int	posix_fadvise(int fd, int offset, int len, int flag)
static int	tryFcntl(int fd, int command, int flags)
static void	tryMlockall()
static void	trySkipCache(int fd, int offset, int len)

Methods inherited from class java.lang.Object

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

Method Detail

fcntl

public static int fcntl(int fd,
                        int command,
                        long flags)
                 throws com.sun.jna.LastErrorException

Throws:

com.sun.jna.LastErrorException

posix_fadvise

public static int posix_fadvise(int fd,
                                int offset,
                                int len,
                                int flag)
                         throws com.sun.jna.LastErrorException

Throws:

com.sun.jna.LastErrorException

tryMlockall

public static void tryMlockall()

createHardLink

public static void createHardLink(java.io.File sourceFile,
                                  java.io.File destinationFile)
                           throws java.io.IOException

Create a hard link for a given file.

Parameters:

sourceFile - The name of the source file.

destinationFile - The name of the destination file.

Throws:

java.io.IOException - if an error has occurred while creating the link.

trySkipCache

public static void trySkipCache(int fd,
                                int offset,
                                int len)

tryFcntl

public static int tryFcntl(int fd,
                           int command,
                           int flags)

getfd

public static int getfd(java.io.FileDescriptor descriptor)

Get system file descriptor from FileDescriptor object.

Parameters:

descriptor - - FileDescriptor objec to get fd from

Returns:

file descriptor, -1 or error