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Diffstat (limited to 'libjava/java/lang/Runtime.java')
| -rw-r--r-- | libjava/java/lang/Runtime.java | 812 |
1 files changed, 725 insertions, 87 deletions
diff --git a/libjava/java/lang/Runtime.java b/libjava/java/lang/Runtime.java index 28befc26d19..65f73a337be 100644 --- a/libjava/java/lang/Runtime.java +++ b/libjava/java/lang/Runtime.java @@ -1,147 +1,785 @@ -// Runtime.java - Runtime class. +/* Runtime.java -- access to the VM process + Copyright (C) 1998, 2002 Free Software Foundation -/* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation +This file is part of GNU Classpath. - 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. -This software is copyrighted work licensed under the terms of the -Libgcj License. Please consult the file "LIBGCJ_LICENSE" for -details. */ +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.IOException; +import java.io.File; import java.io.InputStream; +import java.io.IOException; import java.io.OutputStream; +import java.util.HashSet; +import java.util.Iterator; +import java.util.Properties; +import java.util.Set; import java.util.StringTokenizer; /** - * @author Tom Tromey <tromey@cygnus.com> - * @date August 27, 1998 + * Runtime represents the Virtual Machine. + * + * @author John Keiser + * @author Eric Blake <ebb9@email.byu.edu> + * @status still missing 1.4 functionality */ - -/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3 - * "The Java Language Specification", ISBN 0-201-63451-1 - * plus online API docs for JDK 1.2 beta from http://www.javasoft.com. - * Status: All 1.1 methods exist. exec() is not fully implemented. - */ - +// No idea why this class isn't final, since you can't build a subclass! public class Runtime { - public Process exec (String prog) throws IOException + /** + * 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 + * Runtime, 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 insertSystemProperties; 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 { - return exec (prog, null); + insertSystemProperties(defaultProperties); } - public Process exec (String prog, String[] envp) throws IOException + /** + * 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() { - StringTokenizer st = new StringTokenizer(prog); - String[] a = new String[st.countTokens ()]; - for (int i = 0; i < a.length; i++) - a[i] = st.nextToken (); - return exec (a, envp); + 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]; + + init (); } - public Process exec (String[] progarray) throws IOException + /** + * 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 exec (progarray, null); + return current; } - public Process exec (String[] progarray, String[] envp) throws IOException + /** + * 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>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>. + * + * @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 s = System.getSecurityManager(); - if (s != null) - s.checkExec(progarray[0]); - return new ConcreteProcess (progarray, envp); + 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 + { + exitSequence.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). + } } - private final static void checkExit (int status) + /** + * 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>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>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. + * + * @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 s = System.getSecurityManager(); - if (s != null) - s.checkExit(status); + 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(); + } } - public native void exit (int status); - - // Shutdown the runtime without a SecurityManager check. libgcj uses this - // exit function internally. - final native void _exit (int status); + /** + * 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; + } - public native long freeMemory (); - public native void gc (); + /** + * 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); + } - // Deprecated in 1.1. We implement what the JCL book says. - public InputStream getLocalizedInputStream (InputStream in) + /** + * 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) { - return in; + SecurityManager sm = securityManager; // Be thread-safe! + if (sm != null) + sm.checkExit(0); + current.finalizeOnExit = finalizeOnExit; } - // Deprecated in 1.1. We implement what the JCL book says. - public OutputStream getLocalizedOutputStream (OutputStream out) + /** + * 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 out; + return exec(cmdline, null, null); } - public static Runtime getRuntime () + /** + * 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 self; + return exec(cmdline, env, null); } - private final void checkLink (String lib) + /** + * 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 { - if (lib == null) - throw new NullPointerException (); - SecurityManager s = System.getSecurityManager(); - if (s != null) - s.checkLink(lib); + 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); } - private native void _load (String pathname, boolean do_search); + /** + * 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); + } - public void load (String pathname) + /** + * 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 { - _load (pathname, false); + return exec(cmd, env, null); } - public void loadLibrary (String libname) + /** + * 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 + * @XXX Ignores dir, for now + */ + public Process exec(String[] cmd, String[] env, File dir) + throws IOException { - _load (libname, true); + SecurityManager sm = securityManager; // Be thread-safe! + if (sm != null) + sm.checkExec(cmd[0]); + if (env == null) + env = new String[0]; + //XXX Should be: return execInternal(cmd, env, dir); + return execInternal(cmd, env); } - // 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); + /** + * 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(); - public native void runFinalization (); + /** + * 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(); - // This method is static in JDK 1.1, but isn't listed as static in - // the books. It is marked as static in the 1.2 docs. - public static void runFinalizersOnExit (boolean run) + /** + * 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) { - // The status we pass to the security check is unspecified. - checkExit (0); - self.finalize_on_exit = run; + SecurityManager sm = securityManager; // Be thread-safe! + if (sm != null) + sm.checkLink(filename); + _load(filename, false); } - public native long totalMemory (); - public native void traceInstructions (boolean on); - public native void traceMethodCalls (boolean on); + /** + * 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 filename the file 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, false); + } - // A helper for the constructor. - private final native void init (); + /** + * 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; + } - // The sole constructor. - private Runtime () + /** + * 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) { - init (); + return out; } - // Private data. - private static Runtime self = new Runtime (); - // FIXME: for now this can't be static. If it is, our compiler will - // mark it as local, and it will be inaccessible to natRuntime.cc. - private boolean finalize_on_exit; -} + /** + * 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 the constructor which does some internal native + * initialization. + */ + private 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. + * XXX Add directory support. + * + * @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 + */ + // native Process execInternal(String[] cmd, String[] env, File dir); + native Process execInternal(String[] cmd, String[] env); + + /** + * 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 |