Package net.bytebuddy.agent

Class VirtualMachine.ForOpenJ9.Dispatcher.ForJnaPosixEnvironment

java.lang.Object

net.bytebuddy.agent.VirtualMachine.ForOpenJ9.Dispatcher.ForJnaPosixEnvironment

All Implemented Interfaces:

VirtualMachine.ForOpenJ9.Dispatcher

Enclosing interface:

VirtualMachine.ForOpenJ9.Dispatcher

public static class VirtualMachine.ForOpenJ9.Dispatcher.ForJnaPosixEnvironment
extends java.lang.Object
implements VirtualMachine.ForOpenJ9.Dispatcher

A connector implementation for a POSIX environment using JNA.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static interface	VirtualMachine.ForOpenJ9.Dispatcher.ForJnaPosixEnvironment.PosixLibrary	An API for interaction with POSIX systems.
protected static interface	VirtualMachine.ForOpenJ9.Dispatcher.ForJnaPosixEnvironment.PosixOwnerProvider	Represents a system that supports POSIX ownership.

Nested classes/interfaces inherited from interface net.bytebuddy.agent.VirtualMachine.ForOpenJ9.Dispatcher

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

Field Summary

Fields

Modifier and Type	Field	Description
private VirtualMachine.ForOpenJ9.Dispatcher.ForJnaPosixEnvironment.PosixLibrary	library	The JNA library to use.
private VirtualMachine.ForOpenJ9.Dispatcher.ForJnaPosixEnvironment.PosixOwnerProvider	provider	The POSIX owner provider to use.

Constructor Summary

Constructors

Constructor	Description
ForJnaPosixEnvironment(int attempts, long pause, java.util.concurrent.TimeUnit timeUnit)	Creates a new connector for a POSIX environment using JNA.

Method Summary

Modifier and Type	Method	Description
void	chownFileToUser(java.io.File file, long userId)	Changes the ownership of a file.
void	decrementSemaphore(java.io.File directory, java.lang.String name, boolean global, int count)	Decrements a semaphore.
int	getOwnerIdOf(java.io.File file)	Returns the user id of the owner of the supplied file.
java.lang.String	getTemporaryFolder(java.lang.String processId)	Returns this machine's temporary folder.
void	incrementSemaphore(java.io.File directory, java.lang.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 void	notifySemaphore(java.io.File directory, java.lang.String name, int count, short operation, short flags, boolean acceptUnavailable)	Notifies a POSIX semaphore.
int	pid()	Returns the process id of this process.
void	setPermissions(java.io.File file, int permissions)	Sets permissions for the supplied file.
int	userId()	Returns the user id of this process.

Methods inherited from class java.lang.Object

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

Field Detail

library

private final VirtualMachine.ForOpenJ9.Dispatcher.ForJnaPosixEnvironment.PosixLibrary library

The JNA library to use.

provider

private final VirtualMachine.ForOpenJ9.Dispatcher.ForJnaPosixEnvironment.PosixOwnerProvider provider

The POSIX owner provider to use.

Constructor Detail

ForJnaPosixEnvironment

public ForJnaPosixEnvironment(int attempts,
                              long pause,
                              java.util.concurrent.TimeUnit timeUnit)

Creates a new connector for a POSIX environment using JNA.

Parameters:

attempts - The maximum amount of attempts for checking the result of a foreign process.

pause - The pause between two checks for another process to return.

timeUnit - The time unit of the pause time.

Method Detail

getTemporaryFolder

public java.lang.String getTemporaryFolder(java.lang.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(java.io.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(java.io.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(java.io.File directory,
                               java.lang.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(java.io.File directory,
                               java.lang.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(java.io.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.

notifySemaphore

private void notifySemaphore(java.io.File directory,
                             java.lang.String name,
                             int count,
                             short operation,
                             short flags,
                             boolean acceptUnavailable)

Notifies a POSIX semaphore.

Parameters:

directory - The semaphore's directory.

name - The semaphore's name.

count - The amount of notifications to send.

operation - The operation to apply.

flags - The flags to set.

acceptUnavailable - true if a EAGAIN code should be accepted.