author | jzavgren |
Thu, 11 Apr 2013 12:33:33 -0400 | |
changeset 16860 | 8fecebee12b0 |
parent 13149 | 27d52f97a5cc |
child 19399 | e2e5122cd62e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1995, 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.lang; |
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import java.io.*; |
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import java.util.concurrent.TimeUnit; |
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/* java.lang.Process subclass in the UNIX environment. |
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* |
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* @author Mario Wolczko and Ross Knippel. |
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*/ |
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final class UNIXProcess extends Process { |
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private static final sun.misc.JavaIOFileDescriptorAccess fdAccess |
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= sun.misc.SharedSecrets.getJavaIOFileDescriptorAccess(); |
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private final int pid; |
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private int exitcode; |
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private boolean hasExited; |
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private OutputStream stdin_stream; |
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private InputStream stdout_stream; |
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private DeferredCloseInputStream stdout_inner_stream; |
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private InputStream stderr_stream; |
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/* this is for the reaping thread */ |
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private native int waitForProcessExit(int pid); |
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/** |
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* Create a process using fork(2) and exec(2). |
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* |
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* @param std_fds array of file descriptors. Indexes 0, 1, and |
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* 2 correspond to standard input, standard output and |
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* standard error, respectively. On input, a value of -1 |
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* means to create a pipe to connect child and parent |
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* processes. On output, a value which is not -1 is the |
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* parent pipe fd corresponding to the pipe which has |
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* been created. An element of this array is -1 on input |
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* if and only if it is <em>not</em> -1 on output. |
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* @return the pid of the subprocess |
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*/ |
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private native int forkAndExec(byte[] prog, |
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byte[] argBlock, int argc, |
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byte[] envBlock, int envc, |
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byte[] dir, |
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int[] std_fds, |
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boolean redirectErrorStream) |
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throws IOException; |
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UNIXProcess(final byte[] prog, |
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final byte[] argBlock, int argc, |
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final byte[] envBlock, int envc, |
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final byte[] dir, |
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final int[] std_fds, |
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final boolean redirectErrorStream) |
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throws IOException { |
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pid = forkAndExec(prog, |
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argBlock, argc, |
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envBlock, envc, |
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dir, |
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std_fds, |
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redirectErrorStream); |
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java.security.AccessController.doPrivileged( |
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new java.security.PrivilegedAction<Void>() { public Void run() { |
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if (std_fds[0] == -1) |
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stdin_stream = ProcessBuilder.NullOutputStream.INSTANCE; |
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else { |
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FileDescriptor stdin_fd = new FileDescriptor(); |
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fdAccess.set(stdin_fd, std_fds[0]); |
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stdin_stream = new BufferedOutputStream( |
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new FileOutputStream(stdin_fd)); |
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} |
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if (std_fds[1] == -1) |
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stdout_stream = ProcessBuilder.NullInputStream.INSTANCE; |
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else { |
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FileDescriptor stdout_fd = new FileDescriptor(); |
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fdAccess.set(stdout_fd, std_fds[1]); |
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stdout_inner_stream = new DeferredCloseInputStream(stdout_fd); |
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stdout_stream = new BufferedInputStream(stdout_inner_stream); |
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} |
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if (std_fds[2] == -1) |
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stderr_stream = ProcessBuilder.NullInputStream.INSTANCE; |
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else { |
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FileDescriptor stderr_fd = new FileDescriptor(); |
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fdAccess.set(stderr_fd, std_fds[2]); |
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stderr_stream = new DeferredCloseInputStream(stderr_fd); |
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} |
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return null; }}); |
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/* |
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* For each subprocess forked a corresponding reaper thread |
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* is started. That thread is the only thread which waits |
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* for the subprocess to terminate and it doesn't hold any |
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* locks while doing so. This design allows waitFor() and |
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* exitStatus() to be safely executed in parallel (and they |
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* need no native code). |
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*/ |
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java.security.AccessController.doPrivileged( |
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new java.security.PrivilegedAction<Void>() { public Void run() { |
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Thread t = new Thread("process reaper") { |
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public void run() { |
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int res = waitForProcessExit(pid); |
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synchronized (UNIXProcess.this) { |
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hasExited = true; |
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exitcode = res; |
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UNIXProcess.this.notifyAll(); |
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} |
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} |
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}; |
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t.setDaemon(true); |
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t.start(); |
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return null; }}); |
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} |
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public OutputStream getOutputStream() { |
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return stdin_stream; |
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} |
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public InputStream getInputStream() { |
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return stdout_stream; |
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} |
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public InputStream getErrorStream() { |
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return stderr_stream; |
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} |
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public synchronized int waitFor() throws InterruptedException { |
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while (!hasExited) { |
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wait(); |
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} |
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return exitcode; |
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} |
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@Override |
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public synchronized boolean waitFor(long timeout, TimeUnit unit) |
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throws InterruptedException |
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{ |
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if (hasExited) return true; |
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if (timeout <= 0) return false; |
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long timeoutAsNanos = unit.toNanos(timeout); |
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long startTime = System.nanoTime(); |
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long rem = timeoutAsNanos; |
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while (!hasExited && (rem > 0)) { |
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wait(Math.max(TimeUnit.NANOSECONDS.toMillis(rem), 1)); |
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rem = timeoutAsNanos - (System.nanoTime() - startTime); |
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} |
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return hasExited; |
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} |
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|
2 | 180 |
public synchronized int exitValue() { |
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if (!hasExited) { |
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throw new IllegalThreadStateException("process hasn't exited"); |
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} |
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return exitcode; |
2 | 185 |
} |
186 |
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private static native void destroyProcess(int pid, boolean force); |
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private synchronized void destroy(boolean force) { |
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// There is a risk that pid will be recycled, causing us to |
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// kill the wrong process! So we only terminate processes |
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// that appear to still be running. Even with this check, |
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// there is an unavoidable race condition here, but the window |
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// is very small, and OSes try hard to not recycle pids too |
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// soon, so this is quite safe. |
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if (!hasExited) |
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destroyProcess(pid, force); |
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try { |
2 | 198 |
stdin_stream.close(); |
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if (stdout_inner_stream != null) |
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stdout_inner_stream.closeDeferred(stdout_stream); |
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if (stderr_stream instanceof DeferredCloseInputStream) |
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((DeferredCloseInputStream) stderr_stream) |
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.closeDeferred(stderr_stream); |
2 | 204 |
} catch (IOException e) { |
205 |
// ignore |
|
206 |
} |
|
207 |
} |
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public void destroy() { |
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destroy(false); |
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} |
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212 |
|
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213 |
@Override |
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public Process destroyForcibly() { |
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destroy(true); |
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return this; |
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} |
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218 |
|
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219 |
@Override |
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220 |
public synchronized boolean isAlive() { |
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221 |
return !hasExited; |
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222 |
} |
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223 |
|
2 | 224 |
// A FileInputStream that supports the deferment of the actual close |
225 |
// operation until the last pending I/O operation on the stream has |
|
226 |
// finished. This is required on Solaris because we must close the stdin |
|
227 |
// and stdout streams in the destroy method in order to reclaim the |
|
228 |
// underlying file descriptors. Doing so, however, causes any thread |
|
229 |
// currently blocked in a read on one of those streams to receive an |
|
230 |
// IOException("Bad file number"), which is incompatible with historical |
|
231 |
// behavior. By deferring the close we allow any pending reads to see -1 |
|
232 |
// (EOF) as they did before. |
|
233 |
// |
|
234 |
private static class DeferredCloseInputStream |
|
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extends FileInputStream |
2 | 236 |
{ |
237 |
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238 |
private DeferredCloseInputStream(FileDescriptor fd) { |
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super(fd); |
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240 |
} |
2 | 241 |
|
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private Object lock = new Object(); // For the following fields |
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private boolean closePending = false; |
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244 |
private int useCount = 0; |
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245 |
private InputStream streamToClose; |
2 | 246 |
|
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247 |
private void raise() { |
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248 |
synchronized (lock) { |
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249 |
useCount++; |
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250 |
} |
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251 |
} |
2 | 252 |
|
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253 |
private void lower() throws IOException { |
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254 |
synchronized (lock) { |
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255 |
useCount--; |
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256 |
if (useCount == 0 && closePending) { |
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257 |
streamToClose.close(); |
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258 |
} |
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259 |
} |
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260 |
} |
2 | 261 |
|
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262 |
// stc is the actual stream to be closed; it might be this object, or |
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263 |
// it might be an upstream object for which this object is downstream. |
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264 |
// |
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265 |
private void closeDeferred(InputStream stc) throws IOException { |
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266 |
synchronized (lock) { |
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267 |
if (useCount == 0) { |
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268 |
stc.close(); |
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269 |
} else { |
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270 |
closePending = true; |
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271 |
streamToClose = stc; |
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|
272 |
} |
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273 |
} |
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274 |
} |
2 | 275 |
|
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276 |
public void close() throws IOException { |
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277 |
synchronized (lock) { |
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|
278 |
useCount = 0; |
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|
279 |
closePending = false; |
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|
280 |
} |
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281 |
super.close(); |
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282 |
} |
2 | 283 |
|
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284 |
public int read() throws IOException { |
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|
285 |
raise(); |
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|
286 |
try { |
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|
287 |
return super.read(); |
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|
288 |
} finally { |
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|
289 |
lower(); |
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|
290 |
} |
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|
291 |
} |
2 | 292 |
|
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293 |
public int read(byte[] b) throws IOException { |
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|
294 |
raise(); |
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|
295 |
try { |
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|
296 |
return super.read(b); |
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|
297 |
} finally { |
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|
298 |
lower(); |
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|
299 |
} |
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|
300 |
} |
2 | 301 |
|
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302 |
public int read(byte[] b, int off, int len) throws IOException { |
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|
303 |
raise(); |
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|
304 |
try { |
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|
305 |
return super.read(b, off, len); |
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|
306 |
} finally { |
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|
307 |
lower(); |
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|
308 |
} |
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|
309 |
} |
2 | 310 |
|
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|
311 |
public long skip(long n) throws IOException { |
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|
312 |
raise(); |
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|
313 |
try { |
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|
314 |
return super.skip(n); |
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|
315 |
} finally { |
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|
316 |
lower(); |
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|
317 |
} |
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|
318 |
} |
2 | 319 |
|
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|
320 |
public int available() throws IOException { |
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|
321 |
raise(); |
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diff
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|
322 |
try { |
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|
323 |
return super.available(); |
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|
324 |
} finally { |
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|
325 |
lower(); |
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|
326 |
} |
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|
327 |
} |
2 | 328 |
|
329 |
} |
|
330 |
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331 |
private static native void init(); |
2 | 332 |
|
333 |
static { |
|
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334 |
init(); |
2 | 335 |
} |
336 |
} |