45         int optsLen = (options == null) ? 0 : options.length;
  46         int argsLen = (args == null) ? 0 : args.length;
  47         int len = 1 + optsLen + 1 + argsLen;
  48         String cmdarray[] = new String[len];
  49         int pos = 0;
  50         cmdarray[pos++] = Util.javaCommand();
  51         if (options != null) {
  52             for (String opt: options) {
  53                 cmdarray[pos++] = opt;
  54             }
  55         }
  56         cmdarray[pos++] = className;
  57         if (args != null) {
  58             for (String arg: args) {
  59                 cmdarray[pos++] = arg;
  60             }
  61         }
  62         launch0(cmdarray, fd);
  63     }
  64 













  65     /*
  66      * Launch 'java' with specified class with the specified arguments (may be null).
  67      * The launched process will inherit a connected TCP socket. The remote endpoint
  68      * will be the SocketChannel returned by this method.
  69      */
  70     public static SocketChannel launchWithSocketChannel(String className, String options[], String args[]) throws IOException {
  71         ServerSocketChannel ssc = ServerSocketChannel.open();
  72         ssc.socket().bind(new InetSocketAddress(0));
  73         InetSocketAddress isa = new InetSocketAddress(InetAddress.getLocalHost(),
  74                                                       ssc.socket().getLocalPort());
  75         SocketChannel sc1 = SocketChannel.open(isa);
  76         SocketChannel sc2 = ssc.accept();
  77         launch(className, options, args, Util.getFD(sc2));
  78         sc2.close();
  79         ssc.close();
  80         return sc1;
  81     }
  82 
  83     public static SocketChannel launchWithSocketChannel(String className, String args[]) throws IOException {
  84         return launchWithSocketChannel(className, null, args);

  45         int optsLen = (options == null) ? 0 : options.length;
  46         int argsLen = (args == null) ? 0 : args.length;
  47         int len = 1 + optsLen + 1 + argsLen;
  48         String cmdarray[] = new String[len];
  49         int pos = 0;
  50         cmdarray[pos++] = Util.javaCommand();
  51         if (options != null) {
  52             for (String opt: options) {
  53                 cmdarray[pos++] = opt;
  54             }
  55         }
  56         cmdarray[pos++] = className;
  57         if (args != null) {
  58             for (String arg: args) {
  59                 cmdarray[pos++] = arg;
  60             }
  61         }
  62         launch0(cmdarray, fd);
  63     }
  64 
  65 
  66     /**
  67      * Launch 'java' with specified class using a UnixDomainSocket pair linking calling
  68      * process to the child VM. UnixDomainSocket is a simplified interface to PF_UNIX sockets
  69      * which supports byte a time reads and writes.
  70      */
  71     public static UnixDomainSocket launchWithUnixDomainSocket(String className) throws IOException {
  72         UnixDomainSocket[] socks = UnixDomainSocket.socketpair();
  73         launch(className, null, null, socks[0].fd());
  74         socks[0].close();
  75         return socks[1];
  76     }
  77 
  78     /*
  79      * Launch 'java' with specified class with the specified arguments (may be null).
  80      * The launched process will inherit a connected TCP socket. The remote endpoint
  81      * will be the SocketChannel returned by this method.
  82      */
  83     public static SocketChannel launchWithSocketChannel(String className, String options[], String args[]) throws IOException {
  84         ServerSocketChannel ssc = ServerSocketChannel.open();
  85         ssc.socket().bind(new InetSocketAddress(0));
  86         InetSocketAddress isa = new InetSocketAddress(InetAddress.getLocalHost(),
  87                                                       ssc.socket().getLocalPort());
  88         SocketChannel sc1 = SocketChannel.open(isa);
  89         SocketChannel sc2 = ssc.accept();
  90         launch(className, options, args, Util.getFD(sc2));
  91         sc2.close();
  92         ssc.close();
  93         return sc1;
  94     }
  95 
  96     public static SocketChannel launchWithSocketChannel(String className, String args[]) throws IOException {
  97         return launchWithSocketChannel(className, null, args);