re PR libgcj/6389 (System.getProperty("") should always throw an IllegalArgumentException)
Fixes PR libgcj/6389: * Makefile.in: Rebuilt. * Makefile.am (nat_source_files): Added natTimeZone.cc. * java/util/natTimeZone.cc: New file. * java/util/TimeZone.java (getDefaultTimeZoneId): New method. * java/lang/System.java: Merged with Classpath. * java/lang/Runtime.java: Merged with Classpath. * java/lang/natSystem.cc (setErr0): Renamed from setErr; don't run security check. (setIn0): Renamed from setIn; don't run security check. (setOut0): Renamed from setOut; don't run security check. (file_encoding, getpwuid_adaptor, getSystemTimeZone, init_properties): Moved to natRuntime.cc. Moved many includes to natRuntime.cc. (isWordsBigEndian): New method. * java/lang/natRuntime.cc: Include Long.h, also other includes previously in natSystem.cc. (maxMemory): New function. (exitInternal): Renamed from `_exit'. (exit): Removed. (init): Don't set finalize_on_exit. (exitInternal): Use `finalizeOnExit'. (file_encoding, getpwuid_adaptor): New functions from natSystem.cc. (insertSystemProperties): New method, renamed from System::init_properties. Don't set user.timezone. (_load): Don't call checkLink. (execInternal): New method. (availableProcessors): Likewise. (nativeGetLibname): Likewise. From-SVN: r53429
This commit is contained in:
Tom Tromey
Tom Tromey
parent
16133d0058
commit
8639786815
9 changed files with 1881 additions and 725 deletions
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@ -1,252 +1,563 @@
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// System.java - System-specific info.
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/* System.java -- useful methods to interface with the system
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Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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/* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation
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This file is part of GNU Classpath.
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|
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This file is part of libgcj.
|
||||
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. */
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|
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This software is copyrighted work licensed under the terms of the
|
||||
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.lang;
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import java.io.FileDescriptor;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.FilterInputStream;
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import java.io.InputStream;
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import java.io.PrintStream;
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.*;
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import java.util.Properties;
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import java.util.PropertyPermission;
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import java.util.TimeZone;
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import gnu.classpath.Configuration;
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/**
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* @author Tom Tromey <tromey@cygnus.com>
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* @date August 27, 1998
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* System represents system-wide resources; things that represent the
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* general environment. As such, all methods are static.
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*
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* @author John Keiser
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* @author Eric Blake <ebb9@email.byu.edu>
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* @since 1.0
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* @status still missing 1.4 functionality
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*/
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/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
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* "The Java Language Specification", ISBN 0-201-63451-1
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* plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
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* Status: 1.1. Some 1.2 methods missing. Properties code not fully
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* implemented.
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*/
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public final class System
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{
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public static native void arraycopy (Object src, int srcOffset,
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Object dst, int dstOffset,
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int count);
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// WARNING: System is a CORE class in the bootstrap cycle. See the comments
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// in vm/reference/java/lang/Runtime for implications of this fact.
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public static native long currentTimeMillis ();
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// FIXME: When merging with Classpath, remember to remove the call to
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// getDefaultTimeZoneId from java.util.Timezone.
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private static native String getSystemTimeZone ();
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// Get the System Timezone as reported by the OS. It should be in
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// the form PST8PDT so we'll need to parse it and check that it's valid.
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// The result is used to set the user.timezone property in init_properties.
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// FIXME: Using the code from Classpath for generating the System
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// Timezone IMO is suboptimal because it ignores whether the rules for
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// DST match up.
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private static String getDefaultTimeZoneId ()
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/**
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* Add to the default properties. The field is stored in Runtime, because
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* of the bootstrap sequence; but this adds several useful properties to
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* the defaults. Once the default is stabilized, it should not be modified;
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* instead it is passed as a parent properties for fast setup of the
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* defaults when calling <code>setProperties(null)</code>.
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*/
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static
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{
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String sysTimeZoneId = getSystemTimeZone ();
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// Note that this loadLibrary() takes precedence over the one in Object,
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// since Object.<clinit> is waiting for System.<clinit> to complete
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// first; but loading a library twice is harmless.
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if (Configuration.INIT_LOAD_LIBRARY)
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loadLibrary("javalang");
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// Check if this is a valid timezone. Make sure the IDs match
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// since getTimeZone returns GMT if no match is found.
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TimeZone tz = TimeZone.getTimeZone (sysTimeZoneId);
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if (tz.getID ().equals (sysTimeZoneId))
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return sysTimeZoneId;
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Properties defaultProperties = Runtime.defaultProperties;
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defaultProperties.put("gnu.cpu.endian",
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isWordsBigEndian() ? "big" : "little");
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// Check if the base part of sysTimeZoneId is a valid timezone that
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// matches with daylight usage and rawOffset. Make sure the IDs match
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// since getTimeZone returns GMT if no match is found.
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// First find start of GMT offset info and any Daylight zone name.
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int startGMToffset = 0;
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int sysTimeZoneIdLength = sysTimeZoneId.length();
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for (int i = 0; i < sysTimeZoneIdLength && startGMToffset == 0; i++)
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{
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if (Character.isDigit (sysTimeZoneId.charAt (i)))
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startGMToffset = i;
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}
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// XXX FIXME - Temp hack for old systems that set the wrong property
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if (defaultProperties.get("java.io.tmpdir") == null)
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defaultProperties.put("java.io.tmpdir",
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defaultProperties.get("java.tmpdir"));
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}
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/**
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* Stores the current system properties. This can be modified by
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* {@link #setProperties(Properties)}, but will never be null, because
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* setProperties(null) sucks in the default properties.
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*/
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private static Properties properties
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= new Properties(Runtime.defaultProperties);
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int startDaylightZoneName = 0;
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boolean usesDaylight = false;
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for (int i = sysTimeZoneIdLength - 1;
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i >= 0 && !Character.isDigit (sysTimeZoneId.charAt (i)); --i)
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{
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startDaylightZoneName = i;
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}
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if (startDaylightZoneName > 0)
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usesDaylight = true;
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/**
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* The standard InputStream. This is assigned at startup and starts its
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* life perfectly valid. Although it is marked final, you can change it
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* using {@link #setIn(InputStream)} through some hefty VM magic.
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*
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* <p>This corresponds to the C stdin and C++ cin variables, which
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* typically input from the keyboard, but may be used to pipe input from
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* other processes or files. That should all be transparent to you,
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* however.
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*/
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public static final InputStream in
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= new BufferedInputStream (new FileInputStream(FileDescriptor.in));
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/**
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* The standard output PrintStream. This is assigned at startup and
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* starts its life perfectly valid. Although it is marked final, you can
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* change it using {@link #setOut(PrintStream)} through some hefty VM magic.
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*
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* <p>This corresponds to the C stdout and C++ cout variables, which
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* typically output normal messages to the screen, but may be used to pipe
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* output to other processes or files. That should all be transparent to
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* you, however.
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*/
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public static final PrintStream out
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= new PrintStream(new BufferedOutputStream (new FileOutputStream(FileDescriptor.out)), true);
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/**
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* The standard output PrintStream. This is assigned at startup and
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* starts its life perfectly valid. Although it is marked final, you can
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* change it using {@link #setOut(PrintStream)} through some hefty VM magic.
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*
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* <p>This corresponds to the C stderr and C++ cerr variables, which
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* typically output error messages to the screen, but may be used to pipe
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* output to other processes or files. That should all be transparent to
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* you, however.
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*/
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public static final PrintStream err
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= new PrintStream(new BufferedOutputStream (new FileOutputStream(FileDescriptor.err)), true);
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int GMToffset = Integer.parseInt (startDaylightZoneName == 0 ?
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sysTimeZoneId.substring (startGMToffset) :
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sysTimeZoneId.substring (startGMToffset, startDaylightZoneName));
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// Offset could be in hours or seconds. Convert to millis.
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if (GMToffset < 24)
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GMToffset *= 60 * 60;
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GMToffset *= -1000;
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String tzBasename = sysTimeZoneId.substring (0, startGMToffset);
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tz = TimeZone.getTimeZone (tzBasename);
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if (tz.getID ().equals (tzBasename) && tz.getRawOffset () == GMToffset)
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{
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boolean tzUsesDaylight = tz.useDaylightTime ();
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if (usesDaylight && tzUsesDaylight || !usesDaylight && !tzUsesDaylight)
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return tzBasename;
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}
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// If no match, see if a valid timezone has the same attributes as this
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// and then use it instead.
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String[] IDs = TimeZone.getAvailableIDs (GMToffset);
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for (int i = 0; i < IDs.length; ++i)
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{
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// FIXME: The daylight savings rules may not match the rules
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// for the desired zone.
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boolean IDusesDaylight =
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TimeZone.getTimeZone (IDs[i]).useDaylightTime ();
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if (usesDaylight && IDusesDaylight || !usesDaylight && !IDusesDaylight)
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return IDs[i];
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}
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// If all else fails, return null.
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return null;
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/**
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* This class is uninstantiable.
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*/
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private System()
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{
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}
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public static void exit (int status)
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/**
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* Set {@link #in} to a new InputStream. This uses some VM magic to change
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* a "final" variable, so naturally there is a security check,
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* <code>RuntimePermission("setIO")</code>.
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*
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* @param in the new InputStream
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* @throws SecurityException if permission is denied
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* @since 1.1
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*/
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public static void setIn(InputStream in)
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{
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SecurityManager sm = Runtime.securityManager; // Be thread-safe.
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if (sm != null)
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sm.checkPermission(new RuntimePermission("setIO"));
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setIn0(in);
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}
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/**
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* Set {@link #out} to a new PrintStream. This uses some VM magic to change
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* a "final" variable, so naturally there is a security check,
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* <code>RuntimePermission("setIO")</code>.
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*
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* @param out the new PrintStream
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* @throws SecurityException if permission is denied
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* @since 1.1
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*/
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public static void setOut(PrintStream out)
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{
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SecurityManager sm = Runtime.securityManager; // Be thread-safe.
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if (sm != null)
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sm.checkPermission(new RuntimePermission("setIO"));
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setOut0(out);
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}
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/**
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* Set {@link #err} to a new PrintStream. This uses some VM magic to change
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* a "final" variable, so naturally there is a security check,
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* <code>RuntimePermission("setIO")</code>.
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*
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* @param err the new PrintStream
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* @throws SecurityException if permission is denied
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* @since 1.1
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*/
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public static void setErr(PrintStream err)
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{
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SecurityManager sm = Runtime.securityManager; // Be thread-safe.
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if (sm != null)
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sm.checkPermission(new RuntimePermission("setIO"));
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setErr0(err);
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}
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/**
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* Set the current SecurityManager. If a security manager already exists,
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* then <code>RuntimePermission("setSecurityManager")</code> is checked
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* first. Since this permission is denied by the default security manager,
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* setting the security manager is often an irreversible action.
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*
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* <STRONG>Spec Note:</STRONG> Don't ask me, I didn't write it. It looks
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* pretty vulnerable; whoever gets to the gate first gets to set the policy.
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* There is probably some way to set the original security manager as a
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* command line argument to the VM, but I don't know it.
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*
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* @param sm the new SecurityManager
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* @throws SecurityException if permission is denied
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*/
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public synchronized static void setSecurityManager(SecurityManager sm)
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{
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// Implementation note: the field lives in Runtime because of bootstrap
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// initialization issues. This method is synchronized so that no other
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// thread changes it to null before this thread makes the change.
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if (Runtime.securityManager != null)
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Runtime.securityManager.checkPermission
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(new RuntimePermission("setSecurityManager"));
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Runtime.securityManager = sm;
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}
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|
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/**
|
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* Get the current SecurityManager. If the SecurityManager has not been
|
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* set yet, then this method returns null.
|
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*
|
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* @return the current SecurityManager, or null
|
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*/
|
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public static SecurityManager getSecurityManager()
|
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{
|
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// Implementation note: the field lives in Runtime because of bootstrap
|
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// initialization issues.
|
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return Runtime.securityManager;
|
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}
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|
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/**
|
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* Get the current time, measured in the number of milliseconds from the
|
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* beginning of Jan. 1, 1970. This is gathered from the system clock, with
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* any attendant incorrectness (it may be timezone dependent).
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*
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* @return the current time
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* @see java.util.Date
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*/
|
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public static native long currentTimeMillis();
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/**
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* Copy one array onto another from <code>src[srcStart]</code> ...
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* <code>src[srcStart+len-1]</code> to <code>dest[destStart]</code> ...
|
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* <code>dest[destStart+len-1]</code>. First, the arguments are validated:
|
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* neither array may be null, they must be of compatible types, and the
|
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* start and length must fit within both arrays. Then the copying starts,
|
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* and proceeds through increasing slots. If src and dest are the same
|
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* array, this will appear to copy the data to a temporary location first.
|
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* An ArrayStoreException in the middle of copying will leave earlier
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* elements copied, but later elements unchanged.
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*
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* @param src the array to copy elements from
|
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* @param srcStart the starting position in src
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* @param dest the array to copy elements to
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* @param destStart the starting position in dest
|
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* @param len the number of elements to copy
|
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* @throws NullPointerException if src or dest is null
|
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* @throws ArrayStoreException if src or dest is not an array, if they are
|
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* not compatible array types, or if an incompatible runtime type
|
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* is stored in dest
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* @throws IndexOutOfBoundsException if len is negative, or if the start or
|
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* end copy position in either array is out of bounds
|
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*/
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public static native void arraycopy(Object src, int srcStart,
|
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Object dest, int destStart, int len);
|
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|
||||
/**
|
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* Get a hash code computed by the VM for the Object. This hash code will
|
||||
* be the same as Object's hashCode() method. It is usually some
|
||||
* convolution of the pointer to the Object internal to the VM. It
|
||||
* follows standard hash code rules, in that it will remain the same for a
|
||||
* given Object for the lifetime of that Object.
|
||||
*
|
||||
* @param o the Object to get the hash code for
|
||||
* @return the VM-dependent hash code for this Object
|
||||
* @since 1.1
|
||||
*/
|
||||
public static native int identityHashCode(Object o);
|
||||
|
||||
/**
|
||||
* Get all the system properties at once. A security check may be performed,
|
||||
* <code>checkPropertiesAccess</code>. Note that a security manager may
|
||||
* allow getting a single property, but not the entire group.
|
||||
*
|
||||
* <p>The required properties 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>
|
||||
*
|
||||
* In addition, gnu defines several other properties, where ? stands for
|
||||
* each character in '0' through '9':
|
||||
* <dl>
|
||||
* <dt> gnu.cpu.endian <dd>big or little
|
||||
* <dt> gnu.java.io.encoding_scheme_alias.ISO-8859-? <dd>8859_?
|
||||
* <dt> gnu.java.io.encoding_scheme_alias.iso-8859-? <dd>8859_?
|
||||
* <dt> gnu.java.io.encoding_scheme_alias.iso8859_? <dd>8859_?
|
||||
* <dt> gnu.java.io.encoding_scheme_alias.iso-latin-_? <dd>8859_?
|
||||
* <dt> gnu.java.io.encoding_scheme_alias.latin? <dd>8859_?
|
||||
* <dt> gnu.java.io.encoding_scheme_alias.UTF-8 <dd>UTF8
|
||||
* <dt> gnu.java.io.encoding_scheme_alias.utf-8 <dd>UTF8
|
||||
* </dl>
|
||||
*
|
||||
* @return the system properties, will never be null
|
||||
* @throws SecurityException if permission is denied
|
||||
*/
|
||||
public static Properties getProperties()
|
||||
{
|
||||
SecurityManager sm = Runtime.securityManager; // Be thread-safe.
|
||||
if (sm != null)
|
||||
sm.checkPropertiesAccess();
|
||||
return properties;
|
||||
}
|
||||
|
||||
/**
|
||||
* Set all the system properties at once. A security check may be performed,
|
||||
* <code>checkPropertiesAccess</code>. Note that a security manager may
|
||||
* allow setting a single property, but not the entire group. An argument
|
||||
* of null resets the properties to the startup default.
|
||||
*
|
||||
* @param properties the new set of system properties
|
||||
* @throws SecurityException if permission is denied
|
||||
*/
|
||||
public static void setProperties(Properties properties)
|
||||
{
|
||||
SecurityManager sm = Runtime.securityManager; // Be thread-safe.
|
||||
if (sm != null)
|
||||
sm.checkPropertiesAccess();
|
||||
if (properties == null)
|
||||
properties = new Properties(Runtime.defaultProperties);
|
||||
System.properties = properties;
|
||||
}
|
||||
|
||||
/**
|
||||
* Get a single system property by name. A security check may be performed,
|
||||
* <code>checkPropertyAccess(key)</code>.
|
||||
*
|
||||
* @param key the name of the system property to get
|
||||
* @return the property, or null if not found
|
||||
* @throws SecurityException if permission is denied
|
||||
* @throws NullPointerException if key is null
|
||||
* @throws IllegalArgumentException if key is ""
|
||||
*/
|
||||
public static String getProperty(String key)
|
||||
{
|
||||
SecurityManager sm = Runtime.securityManager; // Be thread-safe.
|
||||
if (sm != null)
|
||||
sm.checkPropertyAccess(key);
|
||||
else if (key.length() == 0)
|
||||
throw new IllegalArgumentException("key can't be empty");
|
||||
return properties.getProperty(key);
|
||||
}
|
||||
|
||||
/**
|
||||
* Get a single system property by name. A security check may be performed,
|
||||
* <code>checkPropertyAccess(key)</code>.
|
||||
*
|
||||
* @param key the name of the system property to get
|
||||
* @param def the default
|
||||
* @return the property, or def if not found
|
||||
* @throws SecurityException if permission is denied
|
||||
* @throws NullPointerException if key is null
|
||||
* @throws IllegalArgumentException if key is ""
|
||||
*/
|
||||
public static String getProperty(String key, String def)
|
||||
{
|
||||
SecurityManager sm = Runtime.securityManager; // Be thread-safe.
|
||||
if (sm != null)
|
||||
sm.checkPropertyAccess(key);
|
||||
return properties.getProperty(key, def);
|
||||
}
|
||||
|
||||
/**
|
||||
* Set a single system property by name. A security check may be performed,
|
||||
* <code>checkPropertyAccess(key, "write")</code>.
|
||||
*
|
||||
* @param key the name of the system property to set
|
||||
* @param value the new value
|
||||
* @return the previous value, or null
|
||||
* @throws SecurityException if permission is denied
|
||||
* @throws NullPointerException if key is null
|
||||
* @throws IllegalArgumentException if key is ""
|
||||
* @since 1.2
|
||||
*/
|
||||
public static String setProperty(String key, String value)
|
||||
{
|
||||
SecurityManager sm = Runtime.securityManager; // Be thread-safe.
|
||||
if (sm != null)
|
||||
sm.checkPermission(new PropertyPermission(key, "write"));
|
||||
return (String) properties.setProperty(key, value);
|
||||
}
|
||||
|
||||
/**
|
||||
* This used to get an environment variable, but following Sun's lead,
|
||||
* it now throws an Error. Use <code>getProperty</code> instead.
|
||||
*
|
||||
* @param name the name of the environment variable
|
||||
* @return this does not return
|
||||
* @throws Error this is not supported
|
||||
* @deprecated use {@link #getProperty(String)}; getenv is not supported
|
||||
*/
|
||||
public static String getenv(String name)
|
||||
{
|
||||
throw new Error("getenv no longer supported, use properties instead: "
|
||||
+ name);
|
||||
}
|
||||
|
||||
/**
|
||||
* Terminate the Virtual Machine. This just calls
|
||||
* <code>Runtime.getRuntime().exit(status)</code>, and never returns.
|
||||
* Obviously, a security check is in order, <code>checkExit</code>.
|
||||
*
|
||||
* @param status the exit status; by convention non-zero is abnormal
|
||||
* @throws SecurityException if permission is denied
|
||||
* @see Runtime#exit(int)
|
||||
*/
|
||||
public static void exit(int status)
|
||||
{
|
||||
Runtime.getRuntime().exit(status);
|
||||
}
|
||||
|
||||
public static void gc ()
|
||||
/**
|
||||
* Calls the garbage collector. This is only a hint, and it is up to the
|
||||
* implementation what this hint suggests, but it usually causes a
|
||||
* best-effort attempt to reclaim unused memory from discarded objects.
|
||||
* This calls <code>Runtime.getRuntime().gc()</code>.
|
||||
*
|
||||
* @see Runtime#gc()
|
||||
*/
|
||||
public static void gc()
|
||||
{
|
||||
Runtime.getRuntime().gc();
|
||||
}
|
||||
|
||||
// Marked deprecated in 1.1. We implement what the JCL book says.
|
||||
public static String getenv (String name)
|
||||
{
|
||||
throw new Error ();
|
||||
}
|
||||
|
||||
private static native void init_properties ();
|
||||
|
||||
public static Properties getProperties ()
|
||||
{
|
||||
if (secman != null)
|
||||
secman.checkPropertiesAccess();
|
||||
if (properties == null)
|
||||
init_properties ();
|
||||
return properties;
|
||||
}
|
||||
|
||||
public static String getProperty (String property)
|
||||
{
|
||||
if (secman != null)
|
||||
secman.checkPropertyAccess(property);
|
||||
if (properties == null)
|
||||
init_properties ();
|
||||
return properties.getProperty(property);
|
||||
}
|
||||
|
||||
public static String getProperty (String property, String defval)
|
||||
{
|
||||
if (secman != null)
|
||||
secman.checkPropertyAccess(property);
|
||||
if (properties == null)
|
||||
init_properties ();
|
||||
return properties.getProperty(property, defval);
|
||||
}
|
||||
|
||||
public static SecurityManager getSecurityManager ()
|
||||
{
|
||||
return secman;
|
||||
}
|
||||
|
||||
public static native int identityHashCode (Object obj);
|
||||
|
||||
public static void load (String pathname)
|
||||
{
|
||||
Runtime.getRuntime().load(pathname);
|
||||
}
|
||||
|
||||
public static void loadLibrary (String libname)
|
||||
{
|
||||
Runtime.getRuntime().loadLibrary(libname);
|
||||
}
|
||||
|
||||
public static void runFinalization ()
|
||||
/**
|
||||
* Runs object finalization on pending objects. This is only a hint, and
|
||||
* it is up to the implementation what this hint suggests, but it usually
|
||||
* causes a best-effort attempt to run finalizers on all objects ready
|
||||
* to be reclaimed. This calls
|
||||
* <code>Runtime.getRuntime().runFinalization()</code>.
|
||||
*
|
||||
* @see Runtime#runFinalization()
|
||||
*/
|
||||
public static void runFinalization()
|
||||
{
|
||||
Runtime.getRuntime().runFinalization();
|
||||
}
|
||||
|
||||
// Marked as deprecated in 1.2.
|
||||
public static void runFinalizersOnExit (boolean run)
|
||||
/**
|
||||
* Tell the Runtime whether to run finalization before exiting the
|
||||
* JVM. This is inherently unsafe in multi-threaded applications,
|
||||
* since it can force initialization on objects which are still in use
|
||||
* by live threads, leading to deadlock; therefore this is disabled by
|
||||
* default. There may be a security check, <code>checkExit(0)</code>. This
|
||||
* calls <code>Runtime.getRuntime().runFinalizersOnExit()</code>.
|
||||
*
|
||||
* @param finalizeOnExit whether to run finalizers on exit
|
||||
* @throws SecurityException if permission is denied
|
||||
* @see Runtime#runFinalizersOnExit()
|
||||
* @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)
|
||||
{
|
||||
Runtime.getRuntime().runFinalizersOnExit(run);
|
||||
Runtime.getRuntime().runFinalizersOnExit(finalizeOnExit);
|
||||
}
|
||||
|
||||
private static void checkSetIO ()
|
||||
/**
|
||||
* Load a code file using its explicit system-dependent filename. A security
|
||||
* check may be performed, <code>checkLink</code>. This just calls
|
||||
* <code>Runtime.getRuntime().load(filename)</code>.
|
||||
*
|
||||
* @param filename the code file to load
|
||||
* @throws SecurityException if permission is denied
|
||||
* @throws UnsatisfiedLinkError if the file cannot be loaded
|
||||
* @see Runtime#load(String)
|
||||
*/
|
||||
public static void load(String filename)
|
||||
{
|
||||
// In 1.1, we are supposed to call checkExec, but the argument is
|
||||
// not specified. In 1.2, we are supposed to use checkPermission,
|
||||
// which doesn't exist in 1.1.
|
||||
if (secman != null)
|
||||
secman.checkExec("");
|
||||
Runtime.getRuntime().load(filename);
|
||||
}
|
||||
|
||||
public static native void setErr (PrintStream newErr);
|
||||
public static native void setIn (InputStream newIn);
|
||||
public static native void setOut (PrintStream newOut);
|
||||
|
||||
public static void setProperties (Properties props)
|
||||
/**
|
||||
* Load a library using its explicit system-dependent filename. A security
|
||||
* check may be performed, <code>checkLink</code>. This just calls
|
||||
* <code>Runtime.getRuntime().load(filename)</code>.
|
||||
*
|
||||
* @param libname the library file to load
|
||||
* @throws SecurityException if permission is denied
|
||||
* @throws UnsatisfiedLinkError if the file cannot be loaded
|
||||
* @see Runtime#load(String)
|
||||
*/
|
||||
public static void loadLibrary(String libname)
|
||||
{
|
||||
if (secman != null)
|
||||
secman.checkPropertiesAccess();
|
||||
synchronized (System.class)
|
||||
{
|
||||
properties = props;
|
||||
}
|
||||
Runtime.getRuntime().loadLibrary(libname);
|
||||
}
|
||||
|
||||
public static String setProperty (String key, String value)
|
||||
/**
|
||||
* Convert a library name to its platform-specific variant.
|
||||
*
|
||||
* @param libname the library name, as used in <code>loadLibrary</code>
|
||||
* @return the platform-specific mangling of the name
|
||||
* @since 1.2
|
||||
*/
|
||||
public static String mapLibraryName(String libname)
|
||||
{
|
||||
if (secman != null)
|
||||
secman.checkPermission (new PropertyPermission (key, "write"));
|
||||
if (properties == null)
|
||||
init_properties ();
|
||||
return (String) properties.setProperty (key, value);
|
||||
// XXX Fix this!!!!
|
||||
return Runtime.nativeGetLibname("", libname);
|
||||
}
|
||||
|
||||
// TODO 1.2.
|
||||
// public static String mapLibraryName (String libname);
|
||||
/**
|
||||
* Detect big-endian systems.
|
||||
*
|
||||
* @return true if the system is big-endian.
|
||||
*/
|
||||
static native boolean isWordsBigEndian();
|
||||
|
||||
public static void setSecurityManager (SecurityManager s)
|
||||
{
|
||||
if (secman != null)
|
||||
secman.checkPermission(new RuntimePermission("setSecurityManager"));
|
||||
secman = s;
|
||||
}
|
||||
/**
|
||||
* Set {@link #in} to a new InputStream.
|
||||
*
|
||||
* @param in the new InputStream
|
||||
* @see #setIn(InputStream)
|
||||
*/
|
||||
private static native void setIn0(InputStream in);
|
||||
|
||||
// Public data.
|
||||
public static final InputStream in = new BufferedInputStream (new FileInputStream (FileDescriptor.in));
|
||||
/**
|
||||
* Set {@link #out} to a new PrintStream.
|
||||
*
|
||||
* @param out the new PrintStream
|
||||
* @see #setOut(PrintStream)
|
||||
*/
|
||||
private static native void setOut0(PrintStream out);
|
||||
|
||||
public static final PrintStream out = new PrintStream (new BufferedOutputStream (new FileOutputStream (FileDescriptor.out)), true);
|
||||
|
||||
public static final PrintStream err = new PrintStream (new BufferedOutputStream (new FileOutputStream (FileDescriptor.err)), true);
|
||||
|
||||
// Don't allow System objects to be made.
|
||||
private System ()
|
||||
{
|
||||
}
|
||||
|
||||
// Private data.
|
||||
private static SecurityManager secman = null;
|
||||
private static Properties properties = null;
|
||||
}
|
||||
/**
|
||||
* Set {@link #err} to a new PrintStream.
|
||||
*
|
||||
* @param err the new PrintStream
|
||||
* @see #setErr(PrintStream)
|
||||
*/
|
||||
private static native void setErr0(PrintStream err);
|
||||
} // class System
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue