788 lines
29 KiB
Java
788 lines
29 KiB
Java
/* Runtime.java -- access to the VM process
|
|
Copyright (C) 1998, 2002, 2003, 2004 Free Software Foundation
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
|
|
package java.lang;
|
|
|
|
import java.io.File;
|
|
import java.io.IOException;
|
|
import java.io.InputStream;
|
|
import java.io.OutputStream;
|
|
import java.util.HashSet;
|
|
import java.util.Iterator;
|
|
import java.util.Properties;
|
|
import java.util.Set;
|
|
import java.util.StringTokenizer;
|
|
|
|
/**
|
|
* Runtime represents the Virtual Machine.
|
|
*
|
|
* @author John Keiser
|
|
* @author Eric Blake <ebb9@email.byu.edu>
|
|
* @status still missing 1.4 functionality
|
|
*/
|
|
// No idea why this class isn't final, since you can't build a subclass!
|
|
public class Runtime
|
|
{
|
|
/**
|
|
* The library path, to search when loading libraries. We can also safely use
|
|
* this as a lock for synchronization.
|
|
*/
|
|
private final String[] libpath;
|
|
|
|
/**
|
|
* The current security manager. This is located here instead of in
|
|
* System, to avoid security problems, as well as bootstrap issues.
|
|
* Make sure to access it in a thread-safe manner; it is package visible
|
|
* to avoid overhead in java.lang.
|
|
*/
|
|
static SecurityManager securityManager;
|
|
|
|
/**
|
|
* The default properties defined by the system. This is likewise located
|
|
* here instead of in Runtime, to avoid bootstrap issues; it is package
|
|
* visible to avoid overhead in java.lang. Note that System will add a
|
|
* few more properties to this collection, but that after that, it is
|
|
* treated as read-only.
|
|
*
|
|
* No matter what class you start initialization with, it defers to the
|
|
* superclass, therefore Object.<clinit> will be the first Java code
|
|
* executed. From there, the bootstrap sequence, up to the point that
|
|
* native libraries are loaded (as of March 24, when I traced this
|
|
* manually) is as follows:
|
|
*
|
|
* Object.<clinit> uses a String literal, possibly triggering initialization
|
|
* String.<clinit> calls WeakHashMap.<init>, triggering initialization
|
|
* AbstractMap, WeakHashMap, WeakHashMap$1 have no dependencies
|
|
* String.<clinit> calls CaseInsensitiveComparator.<init>, triggering
|
|
* initialization
|
|
* CaseInsensitiveComparator has no dependencies
|
|
* Object.<clinit> calls System.loadLibrary, triggering initialization
|
|
* System.<clinit> calls System.loadLibrary
|
|
* System.loadLibrary calls Runtime.getRuntime, triggering initialization
|
|
* Runtime.<clinit> calls Properties.<init>, triggering initialization
|
|
* Dictionary, Hashtable, and Properties have no dependencies
|
|
* Runtime.<clinit> calls VMRuntime.insertSystemProperties, triggering
|
|
* initialization of VMRuntime; the VM must make sure that there are
|
|
* not any harmful dependencies
|
|
* Runtime.<clinit> calls Runtime.<init>
|
|
* Runtime.<init> calls StringTokenizer.<init>, triggering initialization
|
|
* StringTokenizer has no dependencies
|
|
* System.loadLibrary calls Runtime.loadLibrary
|
|
* Runtime.loadLibrary should be able to load the library, although it
|
|
* will probably set off another string of initializations from
|
|
* ClassLoader first
|
|
*/
|
|
static Properties defaultProperties = new Properties();
|
|
|
|
static
|
|
{
|
|
init();
|
|
insertSystemProperties(defaultProperties);
|
|
}
|
|
|
|
/**
|
|
* The thread that started the exit sequence. Access to this field must
|
|
* be thread-safe; lock on libpath to avoid deadlock with user code.
|
|
* <code>runFinalization()</code> may want to look at this to see if ALL
|
|
* finalizers should be run, because the virtual machine is about to halt.
|
|
*/
|
|
private Thread exitSequence;
|
|
|
|
/**
|
|
* All shutdown hooks. This is initialized lazily, and set to null once all
|
|
* shutdown hooks have run. Access to this field must be thread-safe; lock
|
|
* on libpath to avoid deadlock with user code.
|
|
*/
|
|
private Set shutdownHooks;
|
|
|
|
/** True if we should finalize on exit. */
|
|
private boolean finalizeOnExit;
|
|
|
|
/**
|
|
* The one and only runtime instance. This must appear after the default
|
|
* properties have been initialized by the VM.
|
|
*/
|
|
private static final Runtime current = new Runtime();
|
|
|
|
/**
|
|
* Not instantiable by a user, this should only create one instance.
|
|
*/
|
|
private Runtime()
|
|
{
|
|
if (current != null)
|
|
throw new InternalError("Attempt to recreate Runtime");
|
|
|
|
// We don't use libpath in the libgcj implementation. We still
|
|
// set it to something to allow the various synchronizations to
|
|
// work.
|
|
libpath = new String[0];
|
|
|
|
}
|
|
|
|
/**
|
|
* Get the current Runtime object for this JVM. This is necessary to access
|
|
* the many instance methods of this class.
|
|
*
|
|
* @return the current Runtime object
|
|
*/
|
|
public static Runtime getRuntime()
|
|
{
|
|
return current;
|
|
}
|
|
|
|
/**
|
|
* Exit the Java runtime. This method will either throw a SecurityException
|
|
* or it will never return. The status code is returned to the system; often
|
|
* a non-zero status code indicates an abnormal exit. Of course, there is a
|
|
* security check, <code>checkExit(status)</code>.
|
|
*
|
|
* <p>First, all shutdown hooks are run, in unspecified order, and
|
|
* concurrently. Next, if finalization on exit has been enabled, all pending
|
|
* finalizers are run. Finally, the system calls <code>halt</code>.</p>
|
|
*
|
|
* <p>If this is run a second time after shutdown has already started, there
|
|
* are two actions. If shutdown hooks are still executing, it blocks
|
|
* indefinitely. Otherwise, if the status is nonzero it halts immediately;
|
|
* if it is zero, it blocks indefinitely. This is typically called by
|
|
* <code>System.exit</code>.</p>
|
|
*
|
|
* @param status the status to exit with
|
|
* @throws SecurityException if permission is denied
|
|
* @see #addShutdownHook(Thread)
|
|
* @see #runFinalizersOnExit(boolean)
|
|
* @see #runFinalization()
|
|
* @see #halt(int)
|
|
*/
|
|
public void exit(int status)
|
|
{
|
|
SecurityManager sm = securityManager; // Be thread-safe!
|
|
if (sm != null)
|
|
sm.checkExit(status);
|
|
boolean first = false;
|
|
synchronized (libpath) // Synch on libpath, not this, to avoid deadlock.
|
|
{
|
|
if (exitSequence == null)
|
|
{
|
|
first = true;
|
|
exitSequence = Thread.currentThread();
|
|
if (shutdownHooks != null)
|
|
{
|
|
Iterator i = shutdownHooks.iterator();
|
|
while (i.hasNext()) // Start all shutdown hooks.
|
|
try
|
|
{
|
|
((Thread) i.next()).start();
|
|
}
|
|
catch (IllegalThreadStateException e)
|
|
{
|
|
i.remove();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (first)
|
|
{
|
|
if (shutdownHooks != null)
|
|
{
|
|
// Check progress of all shutdown hooks. As a hook completes,
|
|
// remove it from the set. If a hook calls exit, it removes
|
|
// itself from the set, then waits indefinitely on the
|
|
// exitSequence thread. Once the set is empty, set it to null to
|
|
// signal all finalizer threads that halt may be called.
|
|
while (! shutdownHooks.isEmpty())
|
|
{
|
|
Thread[] hooks;
|
|
synchronized (libpath)
|
|
{
|
|
hooks = new Thread[shutdownHooks.size()];
|
|
shutdownHooks.toArray(hooks);
|
|
}
|
|
for (int i = hooks.length; --i >= 0; )
|
|
if (! hooks[i].isAlive())
|
|
synchronized (libpath)
|
|
{
|
|
shutdownHooks.remove(hooks[i]);
|
|
}
|
|
try
|
|
{
|
|
Thread.sleep(1); // Give other threads a chance.
|
|
}
|
|
catch (InterruptedException e)
|
|
{
|
|
// Ignore, the next loop just starts sooner.
|
|
}
|
|
}
|
|
synchronized (libpath)
|
|
{
|
|
shutdownHooks = null;
|
|
}
|
|
}
|
|
// XXX Right now, it is the VM that knows whether runFinalizersOnExit
|
|
// is true; so the VM must look at exitSequence to decide whether
|
|
// this should be run on every object.
|
|
runFinalization();
|
|
}
|
|
else
|
|
synchronized (libpath)
|
|
{
|
|
if (shutdownHooks != null)
|
|
{
|
|
shutdownHooks.remove(Thread.currentThread());
|
|
status = 0; // Change status to enter indefinite wait.
|
|
}
|
|
}
|
|
|
|
if (first || status > 0)
|
|
halt(status);
|
|
while (true)
|
|
try
|
|
{
|
|
exitSequence.join();
|
|
}
|
|
catch (InterruptedException e)
|
|
{
|
|
// Ignore, we've suspended indefinitely to let all shutdown
|
|
// hooks complete, and to let any non-zero exits through, because
|
|
// this is a duplicate call to exit(0).
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Register a new shutdown hook. This is invoked when the program exits
|
|
* normally (because all non-daemon threads ended, or because
|
|
* <code>System.exit</code> was invoked), or when the user terminates
|
|
* the virtual machine (such as by typing ^C, or logging off). There is
|
|
* a security check to add hooks,
|
|
* <code>RuntimePermission("shutdownHooks")</code>.
|
|
*
|
|
* <p>The hook must be an initialized, but unstarted Thread. The threads
|
|
* are run concurrently, and started in an arbitrary order; and user
|
|
* threads or daemons may still be running. Once shutdown hooks have
|
|
* started, they must all complete, or else you must use <code>halt</code>,
|
|
* to actually finish the shutdown sequence. Attempts to modify hooks
|
|
* after shutdown has started result in IllegalStateExceptions.</p>
|
|
*
|
|
* <p>It is imperative that you code shutdown hooks defensively, as you
|
|
* do not want to deadlock, and have no idea what other hooks will be
|
|
* running concurrently. It is also a good idea to finish quickly, as the
|
|
* virtual machine really wants to shut down!</p>
|
|
*
|
|
* <p>There are no guarantees that such hooks will run, as there are ways
|
|
* to forcibly kill a process. But in such a drastic case, shutdown hooks
|
|
* would do little for you in the first place.</p>
|
|
*
|
|
* @param hook an initialized, unstarted Thread
|
|
* @throws IllegalArgumentException if the hook is already registered or run
|
|
* @throws IllegalStateException if the virtual machine is already in
|
|
* the shutdown sequence
|
|
* @throws SecurityException if permission is denied
|
|
* @since 1.3
|
|
* @see #removeShutdownHook(Thread)
|
|
* @see #exit(int)
|
|
* @see #halt(int)
|
|
*/
|
|
public void addShutdownHook(Thread hook)
|
|
{
|
|
SecurityManager sm = securityManager; // Be thread-safe!
|
|
if (sm != null)
|
|
sm.checkPermission(new RuntimePermission("shutdownHooks"));
|
|
if (hook.isAlive() || hook.getThreadGroup() == null)
|
|
throw new IllegalArgumentException();
|
|
synchronized (libpath)
|
|
{
|
|
if (exitSequence != null)
|
|
throw new IllegalStateException();
|
|
if (shutdownHooks == null)
|
|
shutdownHooks = new HashSet(); // Lazy initialization.
|
|
if (! shutdownHooks.add(hook))
|
|
throw new IllegalArgumentException();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* De-register a shutdown hook. As when you registered it, there is a
|
|
* security check to remove hooks,
|
|
* <code>RuntimePermission("shutdownHooks")</code>.
|
|
*
|
|
* @param hook the hook to remove
|
|
* @return true if the hook was successfully removed, false if it was not
|
|
* registered in the first place
|
|
* @throws IllegalStateException if the virtual machine is already in
|
|
* the shutdown sequence
|
|
* @throws SecurityException if permission is denied
|
|
* @since 1.3
|
|
* @see #addShutdownHook(Thread)
|
|
* @see #exit(int)
|
|
* @see #halt(int)
|
|
*/
|
|
public boolean removeShutdownHook(Thread hook)
|
|
{
|
|
SecurityManager sm = securityManager; // Be thread-safe!
|
|
if (sm != null)
|
|
sm.checkPermission(new RuntimePermission("shutdownHooks"));
|
|
synchronized (libpath)
|
|
{
|
|
if (exitSequence != null)
|
|
throw new IllegalStateException();
|
|
if (shutdownHooks != null)
|
|
return shutdownHooks.remove(hook);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Forcibly terminate the virtual machine. This call never returns. It is
|
|
* much more severe than <code>exit</code>, as it bypasses all shutdown
|
|
* hooks and initializers. Use caution in calling this! Of course, there is
|
|
* a security check, <code>checkExit(status)</code>.
|
|
*
|
|
* @param status the status to exit with
|
|
* @throws SecurityException if permission is denied
|
|
* @since 1.3
|
|
* @see #exit(int)
|
|
* @see #addShutdownHook(Thread)
|
|
*/
|
|
public void halt(int status)
|
|
{
|
|
SecurityManager sm = securityManager; // Be thread-safe!
|
|
if (sm != null)
|
|
sm.checkExit(status);
|
|
exitInternal(status);
|
|
}
|
|
|
|
/**
|
|
* Tell the VM to run the finalize() method on every single Object before
|
|
* it exits. Note that the JVM may still exit abnormally and not perform
|
|
* this, so you still don't have a guarantee. And besides that, this is
|
|
* inherently unsafe in multi-threaded code, as it may result in deadlock
|
|
* as multiple threads compete to manipulate objects. This value defaults to
|
|
* <code>false</code>. There is a security check, <code>checkExit(0)</code>.
|
|
*
|
|
* @param finalizeOnExit whether to finalize all Objects on exit
|
|
* @throws SecurityException if permission is denied
|
|
* @see #exit(int)
|
|
* @see #gc()
|
|
* @since 1.1
|
|
* @deprecated never rely on finalizers to do a clean, thread-safe,
|
|
* mop-up from your code
|
|
*/
|
|
public static void runFinalizersOnExit(boolean finalizeOnExit)
|
|
{
|
|
SecurityManager sm = securityManager; // Be thread-safe!
|
|
if (sm != null)
|
|
sm.checkExit(0);
|
|
current.finalizeOnExit = finalizeOnExit;
|
|
}
|
|
|
|
/**
|
|
* Create a new subprocess with the specified command line. Calls
|
|
* <code>exec(cmdline, null, null)</code>. A security check is performed,
|
|
* <code>checkExec</code>.
|
|
*
|
|
* @param cmdline the command to call
|
|
* @return the Process object
|
|
* @throws SecurityException if permission is denied
|
|
* @throws IOException if an I/O error occurs
|
|
* @throws NullPointerException if cmdline is null
|
|
* @throws IndexOutOfBoundsException if cmdline is ""
|
|
*/
|
|
public Process exec(String cmdline) throws IOException
|
|
{
|
|
return exec(cmdline, null, null);
|
|
}
|
|
|
|
/**
|
|
* Create a new subprocess with the specified command line and environment.
|
|
* If the environment is null, the process inherits the environment of
|
|
* this process. Calls <code>exec(cmdline, env, null)</code>. A security
|
|
* check is performed, <code>checkExec</code>.
|
|
*
|
|
* @param cmdline the command to call
|
|
* @param env the environment to use, in the format name=value
|
|
* @return the Process object
|
|
* @throws SecurityException if permission is denied
|
|
* @throws IOException if an I/O error occurs
|
|
* @throws NullPointerException if cmdline is null, or env has null entries
|
|
* @throws IndexOutOfBoundsException if cmdline is ""
|
|
*/
|
|
public Process exec(String cmdline, String[] env) throws IOException
|
|
{
|
|
return exec(cmdline, env, null);
|
|
}
|
|
|
|
/**
|
|
* Create a new subprocess with the specified command line, environment, and
|
|
* working directory. If the environment is null, the process inherits the
|
|
* environment of this process. If the directory is null, the process uses
|
|
* the current working directory. This splits cmdline into an array, using
|
|
* the default StringTokenizer, then calls
|
|
* <code>exec(cmdArray, env, dir)</code>. A security check is performed,
|
|
* <code>checkExec</code>.
|
|
*
|
|
* @param cmdline the command to call
|
|
* @param env the environment to use, in the format name=value
|
|
* @param dir the working directory to use
|
|
* @return the Process object
|
|
* @throws SecurityException if permission is denied
|
|
* @throws IOException if an I/O error occurs
|
|
* @throws NullPointerException if cmdline is null, or env has null entries
|
|
* @throws IndexOutOfBoundsException if cmdline is ""
|
|
* @since 1.3
|
|
*/
|
|
public Process exec(String cmdline, String[] env, File dir)
|
|
throws IOException
|
|
{
|
|
StringTokenizer t = new StringTokenizer(cmdline);
|
|
String[] cmd = new String[t.countTokens()];
|
|
for (int i = 0; i < cmd.length; i++)
|
|
cmd[i] = t.nextToken();
|
|
return exec(cmd, env, dir);
|
|
}
|
|
|
|
/**
|
|
* Create a new subprocess with the specified command line, already
|
|
* tokenized. Calls <code>exec(cmd, null, null)</code>. A security check
|
|
* is performed, <code>checkExec</code>.
|
|
*
|
|
* @param cmd the command to call
|
|
* @return the Process object
|
|
* @throws SecurityException if permission is denied
|
|
* @throws IOException if an I/O error occurs
|
|
* @throws NullPointerException if cmd is null, or has null entries
|
|
* @throws IndexOutOfBoundsException if cmd is length 0
|
|
*/
|
|
public Process exec(String[] cmd) throws IOException
|
|
{
|
|
return exec(cmd, null, null);
|
|
}
|
|
|
|
/**
|
|
* Create a new subprocess with the specified command line, already
|
|
* tokenized, and specified environment. If the environment is null, the
|
|
* process inherits the environment of this process. Calls
|
|
* <code>exec(cmd, env, null)</code>. A security check is performed,
|
|
* <code>checkExec</code>.
|
|
*
|
|
* @param cmd the command to call
|
|
* @param env the environment to use, in the format name=value
|
|
* @return the Process object
|
|
* @throws SecurityException if permission is denied
|
|
* @throws IOException if an I/O error occurs
|
|
* @throws NullPointerException if cmd is null, or cmd or env has null
|
|
* entries
|
|
* @throws IndexOutOfBoundsException if cmd is length 0
|
|
*/
|
|
public Process exec(String[] cmd, String[] env) throws IOException
|
|
{
|
|
return exec(cmd, env, null);
|
|
}
|
|
|
|
/**
|
|
* Create a new subprocess with the specified command line, already
|
|
* tokenized, and the specified environment and working directory. If the
|
|
* environment is null, the process inherits the environment of this
|
|
* process. If the directory is null, the process uses the current working
|
|
* directory. A security check is performed, <code>checkExec</code>.
|
|
*
|
|
* @param cmd the command to call
|
|
* @param env the environment to use, in the format name=value
|
|
* @param dir the working directory to use
|
|
* @return the Process object
|
|
* @throws SecurityException if permission is denied
|
|
* @throws IOException if an I/O error occurs
|
|
* @throws NullPointerException if cmd is null, or cmd or env has null
|
|
* entries
|
|
* @throws IndexOutOfBoundsException if cmd is length 0
|
|
* @since 1.3
|
|
*/
|
|
public Process exec(String[] cmd, String[] env, File dir)
|
|
throws IOException
|
|
{
|
|
SecurityManager sm = securityManager; // Be thread-safe!
|
|
if (sm != null)
|
|
sm.checkExec(cmd[0]);
|
|
return execInternal(cmd, env, dir);
|
|
}
|
|
|
|
/**
|
|
* Returns the number of available processors currently available to the
|
|
* virtual machine. This number may change over time; so a multi-processor
|
|
* program want to poll this to determine maximal resource usage.
|
|
*
|
|
* @return the number of processors available, at least 1
|
|
*/
|
|
public native int availableProcessors();
|
|
|
|
/**
|
|
* Find out how much memory is still free for allocating Objects on the heap.
|
|
*
|
|
* @return the number of bytes of free memory for more Objects
|
|
*/
|
|
public native long freeMemory();
|
|
|
|
/**
|
|
* Find out how much memory total is available on the heap for allocating
|
|
* Objects.
|
|
*
|
|
* @return the total number of bytes of memory for Objects
|
|
*/
|
|
public native long totalMemory();
|
|
|
|
/**
|
|
* Returns the maximum amount of memory the virtual machine can attempt to
|
|
* use. This may be <code>Long.MAX_VALUE</code> if there is no inherent
|
|
* limit (or if you really do have a 8 exabyte memory!).
|
|
*
|
|
* @return the maximum number of bytes the virtual machine will attempt
|
|
* to allocate
|
|
*/
|
|
public native long maxMemory();
|
|
|
|
/**
|
|
* Run the garbage collector. This method is more of a suggestion than
|
|
* anything. All this method guarantees is that the garbage collector will
|
|
* have "done its best" by the time it returns. Notice that garbage
|
|
* collection takes place even without calling this method.
|
|
*/
|
|
public native void gc();
|
|
|
|
/**
|
|
* Run finalization on all Objects that are waiting to be finalized. Again,
|
|
* a suggestion, though a stronger one than {@link #gc()}. This calls the
|
|
* <code>finalize</code> method of all objects waiting to be collected.
|
|
*
|
|
* @see #finalize()
|
|
*/
|
|
public native void runFinalization();
|
|
|
|
/**
|
|
* Tell the VM to trace every bytecode instruction that executes (print out
|
|
* a trace of it). No guarantees are made as to where it will be printed,
|
|
* and the VM is allowed to ignore this request.
|
|
*
|
|
* @param on whether to turn instruction tracing on
|
|
*/
|
|
public native void traceInstructions(boolean on);
|
|
|
|
/**
|
|
* Tell the VM to trace every method call that executes (print out a trace
|
|
* of it). No guarantees are made as to where it will be printed, and the
|
|
* VM is allowed to ignore this request.
|
|
*
|
|
* @param on whether to turn method tracing on
|
|
*/
|
|
public native void traceMethodCalls(boolean on);
|
|
|
|
/**
|
|
* Load a native library using the system-dependent filename. This is similar
|
|
* to loadLibrary, except the only name mangling done is inserting "_g"
|
|
* before the final ".so" if the VM was invoked by the name "java_g". There
|
|
* may be a security check, of <code>checkLink</code>.
|
|
*
|
|
* @param filename the file to load
|
|
* @throws SecurityException if permission is denied
|
|
* @throws UnsatisfiedLinkError if the library is not found
|
|
*/
|
|
public void load(String filename)
|
|
{
|
|
SecurityManager sm = securityManager; // Be thread-safe!
|
|
if (sm != null)
|
|
sm.checkLink(filename);
|
|
_load(filename, false);
|
|
}
|
|
|
|
/**
|
|
* Load a native library using a system-independent "short name" for the
|
|
* library. It will be transformed to a correct filename in a
|
|
* system-dependent manner (for example, in Windows, "mylib" will be turned
|
|
* into "mylib.dll"). This is done as follows: if the context that called
|
|
* load has a ClassLoader cl, then <code>cl.findLibrary(libpath)</code> is
|
|
* used to convert the name. If that result was null, or there was no class
|
|
* loader, this searches each directory of the system property
|
|
* <code>java.library.path</code> for a file named
|
|
* <code>System.mapLibraryName(libname)</code>. There may be a security
|
|
* check, of <code>checkLink</code>.
|
|
*
|
|
* @param libname the library to load
|
|
*
|
|
* @throws SecurityException if permission is denied
|
|
* @throws UnsatisfiedLinkError if the library is not found
|
|
*
|
|
* @see System#mapLibraryName(String)
|
|
* @see ClassLoader#findLibrary(String)
|
|
*/
|
|
public void loadLibrary(String libname)
|
|
{
|
|
// This is different from the Classpath implementation, but I
|
|
// believe it is more correct.
|
|
SecurityManager sm = securityManager; // Be thread-safe!
|
|
if (sm != null)
|
|
sm.checkLink(libname);
|
|
_load(libname, true);
|
|
}
|
|
|
|
/**
|
|
* Return a localized version of this InputStream, meaning all characters
|
|
* are localized before they come out the other end.
|
|
*
|
|
* @param in the stream to localize
|
|
* @return the localized stream
|
|
* @deprecated <code>InputStreamReader</code> is the preferred way to read
|
|
* local encodings
|
|
*/
|
|
public InputStream getLocalizedInputStream(InputStream in)
|
|
{
|
|
return in;
|
|
}
|
|
|
|
/**
|
|
* Return a localized version of this OutputStream, meaning all characters
|
|
* are localized before they are sent to the other end.
|
|
*
|
|
* @param out the stream to localize
|
|
* @return the localized stream
|
|
* @deprecated <code>OutputStreamWriter</code> is the preferred way to write
|
|
* local encodings
|
|
*/
|
|
public OutputStream getLocalizedOutputStream(OutputStream out)
|
|
{
|
|
return out;
|
|
}
|
|
|
|
/**
|
|
* Native method that actually shuts down the virtual machine.
|
|
*
|
|
* @param status the status to end the process with
|
|
*/
|
|
native void exitInternal(int status);
|
|
|
|
/**
|
|
* Load a file. If it has already been loaded, do nothing. The name has
|
|
* already been mapped to a true filename.
|
|
*
|
|
* @param filename the file to load
|
|
* @param do_search True if we should search the load path for the file
|
|
*/
|
|
native void _load(String filename, boolean do_search);
|
|
|
|
/**
|
|
*This is a helper function for the ClassLoader which can load
|
|
* compiled libraries. Returns true if library (which is just the
|
|
* base name -- path searching is done by this function) was loaded,
|
|
* false otherwise.
|
|
*/
|
|
native boolean loadLibraryInternal(String libname);
|
|
|
|
/**
|
|
* A helper for Runtime static initializer which does some internal native
|
|
* initialization.
|
|
*/
|
|
private static native void init ();
|
|
|
|
/**
|
|
* Map a system-independent "short name" to the full file name, and append
|
|
* it to the path.
|
|
* XXX This method is being replaced by System.mapLibraryName.
|
|
*
|
|
* @param pathname the path
|
|
* @param libname the short version of the library name
|
|
* @return the full filename
|
|
*/
|
|
static native String nativeGetLibname(String pathname, String libname);
|
|
|
|
/**
|
|
* Execute a process. The command line has already been tokenized, and
|
|
* the environment should contain name=value mappings. If directory is null,
|
|
* use the current working directory; otherwise start the process in that
|
|
* directory.
|
|
*
|
|
* @param cmd the non-null command tokens
|
|
* @param env the non-null environment setup
|
|
* @param dir the directory to use, may be null
|
|
* @return the newly created process
|
|
* @throws NullPointerException if cmd or env have null elements
|
|
* @throws IOException if the exec fails
|
|
*/
|
|
native Process execInternal(String[] cmd, String[] env, File dir)
|
|
throws IOException;
|
|
|
|
|
|
/**
|
|
* Get the system properties. This is done here, instead of in System,
|
|
* because of the bootstrap sequence. Note that the native code should
|
|
* not try to use the Java I/O classes yet, as they rely on the properties
|
|
* already existing. The only safe method to use to insert these default
|
|
* system properties is {@link Properties#setProperty(String, String)}.
|
|
*
|
|
* <p>These properties MUST include:
|
|
* <dl>
|
|
* <dt>java.version <dd>Java version number
|
|
* <dt>java.vendor <dd>Java vendor specific string
|
|
* <dt>java.vendor.url <dd>Java vendor URL
|
|
* <dt>java.home <dd>Java installation directory
|
|
* <dt>java.vm.specification.version <dd>VM Spec version
|
|
* <dt>java.vm.specification.vendor <dd>VM Spec vendor
|
|
* <dt>java.vm.specification.name <dd>VM Spec name
|
|
* <dt>java.vm.version <dd>VM implementation version
|
|
* <dt>java.vm.vendor <dd>VM implementation vendor
|
|
* <dt>java.vm.name <dd>VM implementation name
|
|
* <dt>java.specification.version <dd>Java Runtime Environment version
|
|
* <dt>java.specification.vendor <dd>Java Runtime Environment vendor
|
|
* <dt>java.specification.name <dd>Java Runtime Environment name
|
|
* <dt>java.class.version <dd>Java class version number
|
|
* <dt>java.class.path <dd>Java classpath
|
|
* <dt>java.library.path <dd>Path for finding Java libraries
|
|
* <dt>java.io.tmpdir <dd>Default temp file path
|
|
* <dt>java.compiler <dd>Name of JIT to use
|
|
* <dt>java.ext.dirs <dd>Java extension path
|
|
* <dt>os.name <dd>Operating System Name
|
|
* <dt>os.arch <dd>Operating System Architecture
|
|
* <dt>os.version <dd>Operating System Version
|
|
* <dt>file.separator <dd>File separator ("/" on Unix)
|
|
* <dt>path.separator <dd>Path separator (":" on Unix)
|
|
* <dt>line.separator <dd>Line separator ("\n" on Unix)
|
|
* <dt>user.name <dd>User account name
|
|
* <dt>user.home <dd>User home directory
|
|
* <dt>user.dir <dd>User's current working directory
|
|
* </dl>
|
|
*
|
|
* @param p the Properties object to insert the system properties into
|
|
*/
|
|
static native void insertSystemProperties(Properties p);
|
|
} // class Runtime
|