Class VirtualMachine.ForOpenJ9.Dispatcher.ForJnaWindowsEnvironment

java.lang.Object

net.bytebuddy.agent.VirtualMachine.ForOpenJ9.Dispatcher.ForJnaWindowsEnvironment

All Implemented Interfaces:

VirtualMachine.ForOpenJ9.Dispatcher

Enclosing interface:

VirtualMachine.ForOpenJ9.Dispatcher

public static class VirtualMachine.ForOpenJ9.Dispatcher.ForJnaWindowsEnvironment
extends Object
implements VirtualMachine.ForOpenJ9.Dispatcher

A connector implementation for a Windows environment using JNA.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	VirtualMachine.ForOpenJ9.Dispatcher.ForJnaWindowsEnvironment.AttachmentHandle	A handle for an attachment which is represented by a pair of handles.
protected static interface	VirtualMachine.ForOpenJ9.Dispatcher.ForJnaWindowsEnvironment.WindowsLibrary	A library for interacting with Windows.

Nested classes/interfaces inherited from interface VirtualMachine.ForOpenJ9.Dispatcher

VirtualMachine.ForOpenJ9.Dispatcher.ForJnaPosixEnvironment, VirtualMachine.ForOpenJ9.Dispatcher.ForJnaWindowsEnvironment

Field Summary

Fields

Modifier and Type	Field	Description
private static final String	CREATION_MUTEX_NAME	The name of the creation mutex.
private final VirtualMachine.ForOpenJ9.Dispatcher.ForJnaWindowsEnvironment.WindowsLibrary	library	A library to use for interacting with Windows.
private static final int	NO_USER_ID	Indicates a missing user id what is not supported on Windows.

Constructor Summary

Constructors

Constructor	Description
ForJnaWindowsEnvironment()	Creates a new connector for a Windows environment using JNA.

Method Summary

Modifier and Type	Method	Description
void	chownFileToUser(File file, long userId)	Changes the ownership of a file.
void	decrementSemaphore(File directory, String name, boolean global, int count)	Decrements a semaphore.
int	getOwnerIdOf(File file)	Returns the user id of the owner of the supplied file.
String	getTemporaryFolder(String processId)	Returns this machine's temporary folder.
void	incrementSemaphore(File directory, String name, boolean global, int count)	Increments a semaphore.
boolean	isExistingProcess(int processId)	Returns true if the supplied process id is a running process.
private VirtualMachine.ForOpenJ9.Dispatcher.ForJnaWindowsEnvironment.AttachmentHandle	openSemaphore(File directory, String name, boolean global)	Opens a semaphore for signaling another process that an attachment is performed.
int	pid()	Returns the process id of this process.
void	setPermissions(File file, int permissions)	Sets permissions for the supplied file.
int	userId()	Returns the user id of this process.

Methods inherited from class Object

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

Field Details

NO_USER_ID

private static final int NO_USER_ID

Indicates a missing user id what is not supported on Windows.

See Also:

• Constant Field Values

CREATION_MUTEX_NAME

private static final String CREATION_MUTEX_NAME

The name of the creation mutex.

See Also:

• Constant Field Values

library

private final VirtualMachine.ForOpenJ9.Dispatcher.ForJnaWindowsEnvironment.WindowsLibrary library

A library to use for interacting with Windows.

Constructor Details

ForJnaWindowsEnvironment

public ForJnaWindowsEnvironment()

Creates a new connector for a Windows environment using JNA.

Method Details

getTemporaryFolder

public String getTemporaryFolder(String processId)

Returns this machine's temporary folder.

Specified by:

getTemporaryFolder in interface VirtualMachine.ForOpenJ9.Dispatcher

Parameters:

processId - The target process's id.

Returns:

The temporary folder.

pid

public int pid()

Returns the process id of this process.

Specified by:

pid in interface VirtualMachine.ForOpenJ9.Dispatcher

Returns:

The process id of this process.

userId

public int userId()

Returns the user id of this process.

Specified by:

userId in interface VirtualMachine.ForOpenJ9.Dispatcher

Returns:

The user id of this process

isExistingProcess

public boolean isExistingProcess(int processId)

Returns true if the supplied process id is a running process.

Specified by:

isExistingProcess in interface VirtualMachine.ForOpenJ9.Dispatcher

Parameters:

processId - The process id to evaluate.

Returns:

true if the supplied process id is currently running.

getOwnerIdOf

public int getOwnerIdOf(File file)

Returns the user id of the owner of the supplied file.

Specified by:

getOwnerIdOf in interface VirtualMachine.ForOpenJ9.Dispatcher

Parameters:

file - The file for which to locate the owner.

Returns:

The owner id of the supplied file.

setPermissions

public void setPermissions(File file,
 int permissions)

Sets permissions for the supplied file.

Specified by:

setPermissions in interface VirtualMachine.ForOpenJ9.Dispatcher

Parameters:

file - The file for which to set the permissions.

permissions - The permission bits to set.

incrementSemaphore

public void incrementSemaphore(File directory,
 String name,
 boolean global,
 int count)

Increments a semaphore.

Specified by:

incrementSemaphore in interface VirtualMachine.ForOpenJ9.Dispatcher

Parameters:

directory - The sempahore's control directory.

name - The semaphore's name.

global - true if the semaphore is in the global namespace (only applicable on Windows).

count - The amount of increments.

decrementSemaphore

public void decrementSemaphore(File directory,
 String name,
 boolean global,
 int count)

Decrements a semaphore.

Specified by:

decrementSemaphore in interface VirtualMachine.ForOpenJ9.Dispatcher

Parameters:

directory - The sempahore's control directory.

name - The semaphore's name.

global - true if the semaphore is in the global namespace (only applicable on Windows).

count - The amount of decrements.

chownFileToUser

public void chownFileToUser(File file,
 long userId)

Changes the ownership of a file. Can be called only if this process is owned by root.

Specified by:

chownFileToUser in interface VirtualMachine.ForOpenJ9.Dispatcher

Parameters:

file - The path of the file to change ownership of.

userId - The user that should own the file.

openSemaphore

private VirtualMachine.ForOpenJ9.Dispatcher.ForJnaWindowsEnvironment.AttachmentHandle openSemaphore(File directory,
 String name,
 boolean global)

Opens a semaphore for signaling another process that an attachment is performed.

Parameters:

directory - The control directory.

name - The semaphore's name.

global - true if the semaphore is in the global namespace.

Returns:

A handle for signaling an attachment to the target process.