## 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 void` `createHardLinkWithExec(java.io.File sourceFile, java.io.File destinationFile)`
`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, long offset, int len, int flag)`
`static int` `tryFcntl(int fd, int command, int flags)`
`static void` `tryMlockall()`
`static void` `trySkipCache(int fd, long 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,
                                    long 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.

### createHardLinkWithExec

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

  Throws:
    `java.io.IOException`

### trySkipCache

    public static void trySkipCache(int fd,
                                    long 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

Copyright © 2012 The Apache Software Foundation