928 lines
38 KiB
928 lines
38 KiB
/*
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* Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.lang;
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import java.io.*;
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import java.util.StringTokenizer;
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import sun.reflect.CallerSensitive;
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import sun.reflect.Reflection;
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/**
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* Every Java application has a single instance of class
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* <code>Runtime</code> that allows the application to interface with
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* the environment in which the application is running. The current
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* runtime can be obtained from the <code>getRuntime</code> method.
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* <p>
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* An application cannot create its own instance of this class.
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*
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* @author unascribed
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* @see java.lang.Runtime#getRuntime()
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* @since JDK1.0
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*/
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public class Runtime {
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private static Runtime currentRuntime = new Runtime();
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/**
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* Returns the runtime object associated with the current Java application.
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* Most of the methods of class <code>Runtime</code> are instance
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* methods and must be invoked with respect to the current runtime object.
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*
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* @return the <code>Runtime</code> object associated with the current
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* Java application.
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*/
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public static Runtime getRuntime() {
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return currentRuntime;
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}
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/** Don't let anyone else instantiate this class */
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private Runtime() {}
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/**
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* Terminates the currently running Java virtual machine by initiating its
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* shutdown sequence. This method never returns normally. The argument
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* serves as a status code; by convention, a nonzero status code indicates
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* abnormal termination.
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*
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* <p> The virtual machine's shutdown sequence consists of two phases. In
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* the first phase all registered {@link #addShutdownHook shutdown hooks},
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* if any, are started in some unspecified order and allowed to run
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* concurrently until they finish. In the second phase all uninvoked
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* finalizers are run if {@link #runFinalizersOnExit finalization-on-exit}
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* has been enabled. Once this is done the virtual machine {@link #halt
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* halts}.
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*
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* <p> If this method is invoked after the virtual machine has begun its
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* shutdown sequence then if shutdown hooks are being run this method will
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* block indefinitely. If shutdown hooks have already been run and on-exit
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* finalization has been enabled then this method halts the virtual machine
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* with the given status code if the status is nonzero; otherwise, it
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* blocks indefinitely.
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*
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* <p> The <tt>{@link System#exit(int) System.exit}</tt> method is the
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* conventional and convenient means of invoking this method. <p>
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*
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* @param status
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* Termination status. By convention, a nonzero status code
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* indicates abnormal termination.
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*
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* @throws SecurityException
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* If a security manager is present and its <tt>{@link
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* SecurityManager#checkExit checkExit}</tt> method does not permit
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* exiting with the specified status
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*
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* @see java.lang.SecurityException
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* @see java.lang.SecurityManager#checkExit(int)
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* @see #addShutdownHook
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* @see #removeShutdownHook
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* @see #runFinalizersOnExit
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* @see #halt(int)
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*/
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public void exit(int status) {
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SecurityManager security = System.getSecurityManager();
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if (security != null) {
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security.checkExit(status);
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}
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Shutdown.exit(status);
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}
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/**
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* Registers a new virtual-machine shutdown hook.
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*
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* <p> The Java virtual machine <i>shuts down</i> in response to two kinds
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* of events:
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*
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* <ul>
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*
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* <li> The program <i>exits</i> normally, when the last non-daemon
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* thread exits or when the <tt>{@link #exit exit}</tt> (equivalently,
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* {@link System#exit(int) System.exit}) method is invoked, or
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*
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* <li> The virtual machine is <i>terminated</i> in response to a
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* user interrupt, such as typing <tt>^C</tt>, or a system-wide event,
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* such as user logoff or system shutdown.
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*
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* </ul>
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*
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* <p> A <i>shutdown hook</i> is simply an initialized but unstarted
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* thread. When the virtual machine begins its shutdown sequence it will
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* start all registered shutdown hooks in some unspecified order and let
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* them run concurrently. When all the hooks have finished it will then
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* run all uninvoked finalizers if finalization-on-exit has been enabled.
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* Finally, the virtual machine will halt. Note that daemon threads will
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* continue to run during the shutdown sequence, as will non-daemon threads
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* if shutdown was initiated by invoking the <tt>{@link #exit exit}</tt>
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* method.
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*
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* <p> Once the shutdown sequence has begun it can be stopped only by
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* invoking the <tt>{@link #halt halt}</tt> method, which forcibly
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* terminates the virtual machine.
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*
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* <p> Once the shutdown sequence has begun it is impossible to register a
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* new shutdown hook or de-register a previously-registered hook.
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* Attempting either of these operations will cause an
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* <tt>{@link IllegalStateException}</tt> to be thrown.
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*
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* <p> Shutdown hooks run at a delicate time in the life cycle of a virtual
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* machine and should therefore be coded defensively. They should, in
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* particular, be written to be thread-safe and to avoid deadlocks insofar
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* as possible. They should also not rely blindly upon services that may
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* have registered their own shutdown hooks and therefore may themselves in
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* the process of shutting down. Attempts to use other thread-based
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* services such as the AWT event-dispatch thread, for example, may lead to
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* deadlocks.
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*
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* <p> Shutdown hooks should also finish their work quickly. When a
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* program invokes <tt>{@link #exit exit}</tt> the expectation is
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* that the virtual machine will promptly shut down and exit. When the
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* virtual machine is terminated due to user logoff or system shutdown the
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* underlying operating system may only allow a fixed amount of time in
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* which to shut down and exit. It is therefore inadvisable to attempt any
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* user interaction or to perform a long-running computation in a shutdown
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* hook.
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*
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* <p> Uncaught exceptions are handled in shutdown hooks just as in any
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* other thread, by invoking the <tt>{@link ThreadGroup#uncaughtException
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* uncaughtException}</tt> method of the thread's <tt>{@link
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* ThreadGroup}</tt> object. The default implementation of this method
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* prints the exception's stack trace to <tt>{@link System#err}</tt> and
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* terminates the thread; it does not cause the virtual machine to exit or
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* halt.
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*
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* <p> In rare circumstances the virtual machine may <i>abort</i>, that is,
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* stop running without shutting down cleanly. This occurs when the
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* virtual machine is terminated externally, for example with the
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* <tt>SIGKILL</tt> signal on Unix or the <tt>TerminateProcess</tt> call on
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* Microsoft Windows. The virtual machine may also abort if a native
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* method goes awry by, for example, corrupting internal data structures or
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* attempting to access nonexistent memory. If the virtual machine aborts
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* then no guarantee can be made about whether or not any shutdown hooks
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* will be run. <p>
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*
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* @param hook
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* An initialized but unstarted <tt>{@link Thread}</tt> object
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*
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* @throws IllegalArgumentException
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* If the specified hook has already been registered,
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* or if it can be determined that the hook is already running or
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* has already been run
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*
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* @throws IllegalStateException
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* If the virtual machine is already in the process
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* of shutting down
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*
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* @throws SecurityException
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* If a security manager is present and it denies
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* <tt>{@link RuntimePermission}("shutdownHooks")</tt>
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*
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* @see #removeShutdownHook
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* @see #halt(int)
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* @see #exit(int)
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* @since 1.3
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*/
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public void addShutdownHook(Thread hook) {
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SecurityManager sm = System.getSecurityManager();
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if (sm != null) {
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sm.checkPermission(new RuntimePermission("shutdownHooks"));
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}
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ApplicationShutdownHooks.add(hook);
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}
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/**
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* De-registers a previously-registered virtual-machine shutdown hook. <p>
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*
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* @param hook the hook to remove
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* @return <tt>true</tt> if the specified hook had previously been
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* registered and was successfully de-registered, <tt>false</tt>
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* otherwise.
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*
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* @throws IllegalStateException
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* If the virtual machine is already in the process of shutting
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* down
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*
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* @throws SecurityException
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* If a security manager is present and it denies
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* <tt>{@link RuntimePermission}("shutdownHooks")</tt>
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*
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* @see #addShutdownHook
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* @see #exit(int)
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* @since 1.3
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*/
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public boolean removeShutdownHook(Thread hook) {
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SecurityManager sm = System.getSecurityManager();
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if (sm != null) {
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sm.checkPermission(new RuntimePermission("shutdownHooks"));
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}
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return ApplicationShutdownHooks.remove(hook);
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}
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/**
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* Forcibly terminates the currently running Java virtual machine. This
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* method never returns normally.
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*
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* <p> This method should be used with extreme caution. Unlike the
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* <tt>{@link #exit exit}</tt> method, this method does not cause shutdown
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* hooks to be started and does not run uninvoked finalizers if
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* finalization-on-exit has been enabled. If the shutdown sequence has
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* already been initiated then this method does not wait for any running
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* shutdown hooks or finalizers to finish their work. <p>
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*
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* @param status
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* Termination status. By convention, a nonzero status code
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* indicates abnormal termination. If the <tt>{@link Runtime#exit
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* exit}</tt> (equivalently, <tt>{@link System#exit(int)
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* System.exit}</tt>) method has already been invoked then this
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* status code will override the status code passed to that method.
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*
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* @throws SecurityException
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* If a security manager is present and its <tt>{@link
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* SecurityManager#checkExit checkExit}</tt> method does not permit
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* an exit with the specified status
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*
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* @see #exit
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* @see #addShutdownHook
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* @see #removeShutdownHook
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* @since 1.3
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*/
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public void halt(int status) {
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SecurityManager sm = System.getSecurityManager();
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if (sm != null) {
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sm.checkExit(status);
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}
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Shutdown.halt(status);
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}
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/**
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* Enable or disable finalization on exit; doing so specifies that the
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* finalizers of all objects that have finalizers that have not yet been
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* automatically invoked are to be run before the Java runtime exits.
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* By default, finalization on exit is disabled.
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*
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* <p>If there is a security manager,
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* its <code>checkExit</code> method is first called
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* with 0 as its argument to ensure the exit is allowed.
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* This could result in a SecurityException.
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*
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* @param value true to enable finalization on exit, false to disable
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* @deprecated This method is inherently unsafe. It may result in
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* finalizers being called on live objects while other threads are
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* concurrently manipulating those objects, resulting in erratic
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* behavior or deadlock.
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*
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* @throws SecurityException
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* if a security manager exists and its <code>checkExit</code>
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* method doesn't allow the exit.
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*
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* @see java.lang.Runtime#exit(int)
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* @see java.lang.Runtime#gc()
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* @see java.lang.SecurityManager#checkExit(int)
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* @since JDK1.1
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*/
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@Deprecated
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public static void runFinalizersOnExit(boolean value) {
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SecurityManager security = System.getSecurityManager();
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if (security != null) {
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try {
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security.checkExit(0);
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} catch (SecurityException e) {
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throw new SecurityException("runFinalizersOnExit");
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}
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}
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Shutdown.setRunFinalizersOnExit(value);
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}
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/**
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* Executes the specified string command in a separate process.
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*
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* <p>This is a convenience method. An invocation of the form
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* <tt>exec(command)</tt>
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* behaves in exactly the same way as the invocation
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* <tt>{@link #exec(String, String[], File) exec}(command, null, null)</tt>.
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*
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* @param command a specified system command.
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*
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* @return A new {@link Process} object for managing the subprocess
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*
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* @throws SecurityException
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* If a security manager exists and its
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* {@link SecurityManager#checkExec checkExec}
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* method doesn't allow creation of the subprocess
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*
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* @throws IOException
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* If an I/O error occurs
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*
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* @throws NullPointerException
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* If <code>command</code> is <code>null</code>
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*
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* @throws IllegalArgumentException
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* If <code>command</code> is empty
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*
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* @see #exec(String[], String[], File)
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* @see ProcessBuilder
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*/
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public Process exec(String command) throws IOException {
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return exec(command, null, null);
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}
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/**
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* Executes the specified string command in a separate process with the
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* specified environment.
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*
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* <p>This is a convenience method. An invocation of the form
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* <tt>exec(command, envp)</tt>
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* behaves in exactly the same way as the invocation
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* <tt>{@link #exec(String, String[], File) exec}(command, envp, null)</tt>.
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*
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* @param command a specified system command.
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*
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* @param envp array of strings, each element of which
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* has environment variable settings in the format
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* <i>name</i>=<i>value</i>, or
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* <tt>null</tt> if the subprocess should inherit
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* the environment of the current process.
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*
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* @return A new {@link Process} object for managing the subprocess
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*
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* @throws SecurityException
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* If a security manager exists and its
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* {@link SecurityManager#checkExec checkExec}
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* method doesn't allow creation of the subprocess
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*
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* @throws IOException
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* If an I/O error occurs
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*
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* @throws NullPointerException
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* If <code>command</code> is <code>null</code>,
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* or one of the elements of <code>envp</code> is <code>null</code>
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*
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* @throws IllegalArgumentException
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* If <code>command</code> is empty
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*
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* @see #exec(String[], String[], File)
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* @see ProcessBuilder
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*/
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public Process exec(String command, String[] envp) throws IOException {
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return exec(command, envp, null);
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}
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/**
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* Executes the specified string command in a separate process with the
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* specified environment and working directory.
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*
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* <p>This is a convenience method. An invocation of the form
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* <tt>exec(command, envp, dir)</tt>
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* behaves in exactly the same way as the invocation
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* <tt>{@link #exec(String[], String[], File) exec}(cmdarray, envp, dir)</tt>,
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* where <code>cmdarray</code> is an array of all the tokens in
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* <code>command</code>.
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*
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* <p>More precisely, the <code>command</code> string is broken
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* into tokens using a {@link StringTokenizer} created by the call
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* <code>new {@link StringTokenizer}(command)</code> with no
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* further modification of the character categories. The tokens
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* produced by the tokenizer are then placed in the new string
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* array <code>cmdarray</code>, in the same order.
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*
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* @param command a specified system command.
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*
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* @param envp array of strings, each element of which
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* has environment variable settings in the format
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* <i>name</i>=<i>value</i>, or
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* <tt>null</tt> if the subprocess should inherit
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* the environment of the current process.
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*
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* @param dir the working directory of the subprocess, or
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* <tt>null</tt> if the subprocess should inherit
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* the working directory of the current process.
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*
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* @return A new {@link Process} object for managing the subprocess
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*
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* @throws SecurityException
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* If a security manager exists and its
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* {@link SecurityManager#checkExec checkExec}
|
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* method doesn't allow creation of the subprocess
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*
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* @throws IOException
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* If an I/O error occurs
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*
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* @throws NullPointerException
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* If <code>command</code> is <code>null</code>,
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* or one of the elements of <code>envp</code> is <code>null</code>
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*
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* @throws IllegalArgumentException
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* If <code>command</code> is empty
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*
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* @see ProcessBuilder
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* @since 1.3
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*/
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public Process exec(String command, String[] envp, File dir)
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throws IOException {
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if (command.length() == 0)
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throw new IllegalArgumentException("Empty command");
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StringTokenizer st = new StringTokenizer(command);
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String[] cmdarray = new String[st.countTokens()];
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for (int i = 0; st.hasMoreTokens(); i++)
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cmdarray[i] = st.nextToken();
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return exec(cmdarray, envp, dir);
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}
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|
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/**
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* Executes the specified command and arguments in a separate process.
|
|
*
|
|
* <p>This is a convenience method. An invocation of the form
|
|
* <tt>exec(cmdarray)</tt>
|
|
* behaves in exactly the same way as the invocation
|
|
* <tt>{@link #exec(String[], String[], File) exec}(cmdarray, null, null)</tt>.
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|
*
|
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* @param cmdarray array containing the command to call and
|
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* its arguments.
|
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*
|
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* @return A new {@link Process} object for managing the subprocess
|
|
*
|
|
* @throws SecurityException
|
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* If a security manager exists and its
|
|
* {@link SecurityManager#checkExec checkExec}
|
|
* method doesn't allow creation of the subprocess
|
|
*
|
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* @throws IOException
|
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* If an I/O error occurs
|
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*
|
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* @throws NullPointerException
|
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* If <code>cmdarray</code> is <code>null</code>,
|
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* or one of the elements of <code>cmdarray</code> is <code>null</code>
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*
|
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* @throws IndexOutOfBoundsException
|
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* If <code>cmdarray</code> is an empty array
|
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* (has length <code>0</code>)
|
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*
|
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* @see ProcessBuilder
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*/
|
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public Process exec(String cmdarray[]) throws IOException {
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return exec(cmdarray, null, null);
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}
|
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|
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/**
|
|
* Executes the specified command and arguments in a separate process
|
|
* with the specified environment.
|
|
*
|
|
* <p>This is a convenience method. An invocation of the form
|
|
* <tt>exec(cmdarray, envp)</tt>
|
|
* behaves in exactly the same way as the invocation
|
|
* <tt>{@link #exec(String[], String[], File) exec}(cmdarray, envp, null)</tt>.
|
|
*
|
|
* @param cmdarray array containing the command to call and
|
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* its arguments.
|
|
*
|
|
* @param envp array of strings, each element of which
|
|
* has environment variable settings in the format
|
|
* <i>name</i>=<i>value</i>, or
|
|
* <tt>null</tt> if the subprocess should inherit
|
|
* the environment of the current process.
|
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*
|
|
* @return A new {@link Process} object for managing the subprocess
|
|
*
|
|
* @throws SecurityException
|
|
* If a security manager exists and its
|
|
* {@link SecurityManager#checkExec checkExec}
|
|
* method doesn't allow creation of the subprocess
|
|
*
|
|
* @throws IOException
|
|
* If an I/O error occurs
|
|
*
|
|
* @throws NullPointerException
|
|
* If <code>cmdarray</code> is <code>null</code>,
|
|
* or one of the elements of <code>cmdarray</code> is <code>null</code>,
|
|
* or one of the elements of <code>envp</code> is <code>null</code>
|
|
*
|
|
* @throws IndexOutOfBoundsException
|
|
* If <code>cmdarray</code> is an empty array
|
|
* (has length <code>0</code>)
|
|
*
|
|
* @see ProcessBuilder
|
|
*/
|
|
public Process exec(String[] cmdarray, String[] envp) throws IOException {
|
|
return exec(cmdarray, envp, null);
|
|
}
|
|
|
|
|
|
/**
|
|
* Executes the specified command and arguments in a separate process with
|
|
* the specified environment and working directory.
|
|
*
|
|
* <p>Given an array of strings <code>cmdarray</code>, representing the
|
|
* tokens of a command line, and an array of strings <code>envp</code>,
|
|
* representing "environment" variable settings, this method creates
|
|
* a new process in which to execute the specified command.
|
|
*
|
|
* <p>This method checks that <code>cmdarray</code> is a valid operating
|
|
* system command. Which commands are valid is system-dependent,
|
|
* but at the very least the command must be a non-empty list of
|
|
* non-null strings.
|
|
*
|
|
* <p>If <tt>envp</tt> is <tt>null</tt>, the subprocess inherits the
|
|
* environment settings of the current process.
|
|
*
|
|
* <p>A minimal set of system dependent environment variables may
|
|
* be required to start a process on some operating systems.
|
|
* As a result, the subprocess may inherit additional environment variable
|
|
* settings beyond those in the specified environment.
|
|
*
|
|
* <p>{@link ProcessBuilder#start()} is now the preferred way to
|
|
* start a process with a modified environment.
|
|
*
|
|
* <p>The working directory of the new subprocess is specified by <tt>dir</tt>.
|
|
* If <tt>dir</tt> is <tt>null</tt>, the subprocess inherits the
|
|
* current working directory of the current process.
|
|
*
|
|
* <p>If a security manager exists, its
|
|
* {@link SecurityManager#checkExec checkExec}
|
|
* method is invoked with the first component of the array
|
|
* <code>cmdarray</code> as its argument. This may result in a
|
|
* {@link SecurityException} being thrown.
|
|
*
|
|
* <p>Starting an operating system process is highly system-dependent.
|
|
* Among the many things that can go wrong are:
|
|
* <ul>
|
|
* <li>The operating system program file was not found.
|
|
* <li>Access to the program file was denied.
|
|
* <li>The working directory does not exist.
|
|
* </ul>
|
|
*
|
|
* <p>In such cases an exception will be thrown. The exact nature
|
|
* of the exception is system-dependent, but it will always be a
|
|
* subclass of {@link IOException}.
|
|
*
|
|
*
|
|
* @param cmdarray array containing the command to call and
|
|
* its arguments.
|
|
*
|
|
* @param envp array of strings, each element of which
|
|
* has environment variable settings in the format
|
|
* <i>name</i>=<i>value</i>, or
|
|
* <tt>null</tt> if the subprocess should inherit
|
|
* the environment of the current process.
|
|
*
|
|
* @param dir the working directory of the subprocess, or
|
|
* <tt>null</tt> if the subprocess should inherit
|
|
* the working directory of the current process.
|
|
*
|
|
* @return A new {@link Process} object for managing the subprocess
|
|
*
|
|
* @throws SecurityException
|
|
* If a security manager exists and its
|
|
* {@link SecurityManager#checkExec checkExec}
|
|
* method doesn't allow creation of the subprocess
|
|
*
|
|
* @throws IOException
|
|
* If an I/O error occurs
|
|
*
|
|
* @throws NullPointerException
|
|
* If <code>cmdarray</code> is <code>null</code>,
|
|
* or one of the elements of <code>cmdarray</code> is <code>null</code>,
|
|
* or one of the elements of <code>envp</code> is <code>null</code>
|
|
*
|
|
* @throws IndexOutOfBoundsException
|
|
* If <code>cmdarray</code> is an empty array
|
|
* (has length <code>0</code>)
|
|
*
|
|
* @see ProcessBuilder
|
|
* @since 1.3
|
|
*/
|
|
public Process exec(String[] cmdarray, String[] envp, File dir)
|
|
throws IOException {
|
|
return new ProcessBuilder(cmdarray)
|
|
.environment(envp)
|
|
.directory(dir)
|
|
.start();
|
|
}
|
|
|
|
/**
|
|
* Returns the number of processors available to the Java virtual machine.
|
|
*
|
|
* <p> This value may change during a particular invocation of the virtual
|
|
* machine. Applications that are sensitive to the number of available
|
|
* processors should therefore occasionally poll this property and adjust
|
|
* their resource usage appropriately. </p>
|
|
*
|
|
* @return the maximum number of processors available to the virtual
|
|
* machine; never smaller than one
|
|
* @since 1.4
|
|
*/
|
|
public native int availableProcessors();
|
|
|
|
/**
|
|
* Returns the amount of free memory in the Java Virtual Machine.
|
|
* Calling the
|
|
* <code>gc</code> method may result in increasing the value returned
|
|
* by <code>freeMemory.</code>
|
|
*
|
|
* @return an approximation to the total amount of memory currently
|
|
* available for future allocated objects, measured in bytes.
|
|
*/
|
|
public native long freeMemory();
|
|
|
|
/**
|
|
* Returns the total amount of memory in the Java virtual machine.
|
|
* The value returned by this method may vary over time, depending on
|
|
* the host environment.
|
|
* <p>
|
|
* Note that the amount of memory required to hold an object of any
|
|
* given type may be implementation-dependent.
|
|
*
|
|
* @return the total amount of memory currently available for current
|
|
* and future objects, measured in bytes.
|
|
*/
|
|
public native long totalMemory();
|
|
|
|
/**
|
|
* Returns the maximum amount of memory that the Java virtual machine will
|
|
* attempt to use. If there is no inherent limit then the value {@link
|
|
* java.lang.Long#MAX_VALUE} will be returned.
|
|
*
|
|
* @return the maximum amount of memory that the virtual machine will
|
|
* attempt to use, measured in bytes
|
|
* @since 1.4
|
|
*/
|
|
public native long maxMemory();
|
|
|
|
/**
|
|
* Runs the garbage collector.
|
|
* Calling this method suggests that the Java virtual machine expend
|
|
* effort toward recycling unused objects in order to make the memory
|
|
* they currently occupy available for quick reuse. When control
|
|
* returns from the method call, the virtual machine has made
|
|
* its best effort to recycle all discarded objects.
|
|
* <p>
|
|
* The name <code>gc</code> stands for "garbage
|
|
* collector". The virtual machine performs this recycling
|
|
* process automatically as needed, in a separate thread, even if the
|
|
* <code>gc</code> method is not invoked explicitly.
|
|
* <p>
|
|
* The method {@link System#gc()} is the conventional and convenient
|
|
* means of invoking this method.
|
|
*/
|
|
public native void gc();
|
|
|
|
/* Wormhole for calling java.lang.ref.Finalizer.runFinalization */
|
|
private static native void runFinalization0();
|
|
|
|
/**
|
|
* Runs the finalization methods of any objects pending finalization.
|
|
* Calling this method suggests that the Java virtual machine expend
|
|
* effort toward running the <code>finalize</code> methods of objects
|
|
* that have been found to be discarded but whose <code>finalize</code>
|
|
* methods have not yet been run. When control returns from the
|
|
* method call, the virtual machine has made a best effort to
|
|
* complete all outstanding finalizations.
|
|
* <p>
|
|
* The virtual machine performs the finalization process
|
|
* automatically as needed, in a separate thread, if the
|
|
* <code>runFinalization</code> method is not invoked explicitly.
|
|
* <p>
|
|
* The method {@link System#runFinalization()} is the conventional
|
|
* and convenient means of invoking this method.
|
|
*
|
|
* @see java.lang.Object#finalize()
|
|
*/
|
|
public void runFinalization() {
|
|
runFinalization0();
|
|
}
|
|
|
|
/**
|
|
* Enables/Disables tracing of instructions.
|
|
* If the <code>boolean</code> argument is <code>true</code>, this
|
|
* method suggests that the Java virtual machine emit debugging
|
|
* information for each instruction in the virtual machine as it
|
|
* is executed. The format of this information, and the file or other
|
|
* output stream to which it is emitted, depends on the host environment.
|
|
* The virtual machine may ignore this request if it does not support
|
|
* this feature. The destination of the trace output is system
|
|
* dependent.
|
|
* <p>
|
|
* If the <code>boolean</code> argument is <code>false</code>, this
|
|
* method causes the virtual machine to stop performing the
|
|
* detailed instruction trace it is performing.
|
|
*
|
|
* @param on <code>true</code> to enable instruction tracing;
|
|
* <code>false</code> to disable this feature.
|
|
*/
|
|
public native void traceInstructions(boolean on);
|
|
|
|
/**
|
|
* Enables/Disables tracing of method calls.
|
|
* If the <code>boolean</code> argument is <code>true</code>, this
|
|
* method suggests that the Java virtual machine emit debugging
|
|
* information for each method in the virtual machine as it is
|
|
* called. The format of this information, and the file or other output
|
|
* stream to which it is emitted, depends on the host environment. The
|
|
* virtual machine may ignore this request if it does not support
|
|
* this feature.
|
|
* <p>
|
|
* Calling this method with argument false suggests that the
|
|
* virtual machine cease emitting per-call debugging information.
|
|
*
|
|
* @param on <code>true</code> to enable instruction tracing;
|
|
* <code>false</code> to disable this feature.
|
|
*/
|
|
public native void traceMethodCalls(boolean on);
|
|
|
|
/**
|
|
* Loads the native library specified by the filename argument. The filename
|
|
* argument must be an absolute path name.
|
|
* (for example
|
|
* <code>Runtime.getRuntime().load("/home/avh/lib/libX11.so");</code>).
|
|
*
|
|
* If the filename argument, when stripped of any platform-specific library
|
|
* prefix, path, and file extension, indicates a library whose name is,
|
|
* for example, L, and a native library called L is statically linked
|
|
* with the VM, then the JNI_OnLoad_L function exported by the library
|
|
* is invoked rather than attempting to load a dynamic library.
|
|
* A filename matching the argument does not have to exist in the file
|
|
* system. See the JNI Specification for more details.
|
|
*
|
|
* Otherwise, the filename argument is mapped to a native library image in
|
|
* an implementation-dependent manner.
|
|
* <p>
|
|
* First, if there is a security manager, its <code>checkLink</code>
|
|
* method is called with the <code>filename</code> as its argument.
|
|
* This may result in a security exception.
|
|
* <p>
|
|
* This is similar to the method {@link #loadLibrary(String)}, but it
|
|
* accepts a general file name as an argument rather than just a library
|
|
* name, allowing any file of native code to be loaded.
|
|
* <p>
|
|
* The method {@link System#load(String)} is the conventional and
|
|
* convenient means of invoking this method.
|
|
*
|
|
* @param filename the file to load.
|
|
* @exception SecurityException if a security manager exists and its
|
|
* <code>checkLink</code> method doesn't allow
|
|
* loading of the specified dynamic library
|
|
* @exception UnsatisfiedLinkError if either the filename is not an
|
|
* absolute path name, the native library is not statically
|
|
* linked with the VM, or the library cannot be mapped to
|
|
* a native library image by the host system.
|
|
* @exception NullPointerException if <code>filename</code> is
|
|
* <code>null</code>
|
|
* @see java.lang.Runtime#getRuntime()
|
|
* @see java.lang.SecurityException
|
|
* @see java.lang.SecurityManager#checkLink(java.lang.String)
|
|
*/
|
|
@CallerSensitive
|
|
public void load(String filename) {
|
|
load0(Reflection.getCallerClass(), filename);
|
|
}
|
|
|
|
synchronized void load0(Class<?> fromClass, String filename) {
|
|
SecurityManager security = System.getSecurityManager();
|
|
if (security != null) {
|
|
security.checkLink(filename);
|
|
}
|
|
if (!(new File(filename).isAbsolute())) {
|
|
throw new UnsatisfiedLinkError(
|
|
"Expecting an absolute path of the library: " + filename);
|
|
}
|
|
ClassLoader.loadLibrary(fromClass, filename, true);
|
|
}
|
|
|
|
/**
|
|
* Loads the native library specified by the <code>libname</code>
|
|
* argument. The <code>libname</code> argument must not contain any platform
|
|
* specific prefix, file extension or path. If a native library
|
|
* called <code>libname</code> is statically linked with the VM, then the
|
|
* JNI_OnLoad_<code>libname</code> function exported by the library is invoked.
|
|
* See the JNI Specification for more details.
|
|
*
|
|
* Otherwise, the libname argument is loaded from a system library
|
|
* location and mapped to a native library image in an implementation-
|
|
* dependent manner.
|
|
* <p>
|
|
* First, if there is a security manager, its <code>checkLink</code>
|
|
* method is called with the <code>libname</code> as its argument.
|
|
* This may result in a security exception.
|
|
* <p>
|
|
* The method {@link System#loadLibrary(String)} is the conventional
|
|
* and convenient means of invoking this method. If native
|
|
* methods are to be used in the implementation of a class, a standard
|
|
* strategy is to put the native code in a library file (call it
|
|
* <code>LibFile</code>) and then to put a static initializer:
|
|
* <blockquote><pre>
|
|
* static { System.loadLibrary("LibFile"); }
|
|
* </pre></blockquote>
|
|
* within the class declaration. When the class is loaded and
|
|
* initialized, the necessary native code implementation for the native
|
|
* methods will then be loaded as well.
|
|
* <p>
|
|
* If this method is called more than once with the same library
|
|
* name, the second and subsequent calls are ignored.
|
|
*
|
|
* @param libname the name of the library.
|
|
* @exception SecurityException if a security manager exists and its
|
|
* <code>checkLink</code> method doesn't allow
|
|
* loading of the specified dynamic library
|
|
* @exception UnsatisfiedLinkError if either the libname argument
|
|
* contains a file path, the native library is not statically
|
|
* linked with the VM, or the library cannot be mapped to a
|
|
* native library image by the host system.
|
|
* @exception NullPointerException if <code>libname</code> is
|
|
* <code>null</code>
|
|
* @see java.lang.SecurityException
|
|
* @see java.lang.SecurityManager#checkLink(java.lang.String)
|
|
*/
|
|
@CallerSensitive
|
|
public void loadLibrary(String libname) {
|
|
loadLibrary0(Reflection.getCallerClass(), libname);
|
|
}
|
|
|
|
synchronized void loadLibrary0(Class<?> fromClass, String libname) {
|
|
SecurityManager security = System.getSecurityManager();
|
|
if (security != null) {
|
|
security.checkLink(libname);
|
|
}
|
|
if (libname.indexOf((int)File.separatorChar) != -1) {
|
|
throw new UnsatisfiedLinkError(
|
|
"Directory separator should not appear in library name: " + libname);
|
|
}
|
|
ClassLoader.loadLibrary(fromClass, libname, false);
|
|
}
|
|
|
|
/**
|
|
* Creates a localized version of an input stream. This method takes
|
|
* an <code>InputStream</code> and returns an <code>InputStream</code>
|
|
* equivalent to the argument in all respects except that it is
|
|
* localized: as characters in the local character set are read from
|
|
* the stream, they are automatically converted from the local
|
|
* character set to Unicode.
|
|
* <p>
|
|
* If the argument is already a localized stream, it may be returned
|
|
* as the result.
|
|
*
|
|
* @param in InputStream to localize
|
|
* @return a localized input stream
|
|
* @see java.io.InputStream
|
|
* @see java.io.BufferedReader#BufferedReader(java.io.Reader)
|
|
* @see java.io.InputStreamReader#InputStreamReader(java.io.InputStream)
|
|
* @deprecated As of JDK 1.1, the preferred way to translate a byte
|
|
* stream in the local encoding into a character stream in Unicode is via
|
|
* the <code>InputStreamReader</code> and <code>BufferedReader</code>
|
|
* classes.
|
|
*/
|
|
@Deprecated
|
|
public InputStream getLocalizedInputStream(InputStream in) {
|
|
return in;
|
|
}
|
|
|
|
/**
|
|
* Creates a localized version of an output stream. This method
|
|
* takes an <code>OutputStream</code> and returns an
|
|
* <code>OutputStream</code> equivalent to the argument in all respects
|
|
* except that it is localized: as Unicode characters are written to
|
|
* the stream, they are automatically converted to the local
|
|
* character set.
|
|
* <p>
|
|
* If the argument is already a localized stream, it may be returned
|
|
* as the result.
|
|
*
|
|
* @deprecated As of JDK 1.1, the preferred way to translate a
|
|
* Unicode character stream into a byte stream in the local encoding is via
|
|
* the <code>OutputStreamWriter</code>, <code>BufferedWriter</code>, and
|
|
* <code>PrintWriter</code> classes.
|
|
*
|
|
* @param out OutputStream to localize
|
|
* @return a localized output stream
|
|
* @see java.io.OutputStream
|
|
* @see java.io.BufferedWriter#BufferedWriter(java.io.Writer)
|
|
* @see java.io.OutputStreamWriter#OutputStreamWriter(java.io.OutputStream)
|
|
* @see java.io.PrintWriter#PrintWriter(java.io.OutputStream)
|
|
*/
|
|
@Deprecated
|
|
public OutputStream getLocalizedOutputStream(OutputStream out) {
|
|
return out;
|
|
}
|
|
|
|
}
|