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Merge pull request #61 from segrey/run-sendctrlc-with-java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| package org.jvnet.winp; | ||
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|
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| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.io.InputStreamReader; | ||
| import java.io.Reader; | ||
| import java.nio.charset.Charset; | ||
| import java.util.Locale; | ||
|
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| class CtrlCSender { | ||
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| private static final int TIMEOUT_MILLIS = 5000; | ||
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| static boolean sendCtrlC(int pid, String ctrlCExePath) { | ||
| ProcessBuilder builder = new ProcessBuilder(ctrlCExePath, String.valueOf(pid)); | ||
| builder.redirectErrorStream(true); | ||
| Process process; | ||
| try { | ||
| process = builder.start(); | ||
| } catch (IOException e) { | ||
| throw new WinpException(e); | ||
| } | ||
| StreamGobbler stdout = new StreamGobbler(new InputStreamReader(process.getInputStream(), Charset.defaultCharset())); | ||
| Integer exitCode = null; | ||
| try { | ||
| exitCode = waitFor(process); | ||
| } catch (InterruptedException ignored) { | ||
| } | ||
| stdout.stop(); | ||
| if (exitCode == null) { | ||
| process.destroy(); | ||
| throw new WinpException("Failed to send Ctrl+C to " + pid + ": " + TIMEOUT_MILLIS + " ms timeout exceeded"); | ||
| } | ||
| if (exitCode == 0) { | ||
| return true; | ||
| } | ||
| throw new WinpException("Failed to send Ctrl+C, " + new File(ctrlCExePath).getName() + | ||
| " terminated with exit code " + stringifyExitCode(exitCode) + ", output: " + stdout.getText()); | ||
| } | ||
|
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| private static String stringifyExitCode(int exitCode) { | ||
| if (exitCode >= 0xC0000000 && exitCode < 0xD0000000) { | ||
| // http://support.microsoft.com/kb/308558: | ||
| // If the result code has the "C0000XXX" format, the task did not complete successfully (the "C" indicates an error condition). | ||
| // The most common "C" error code is "0xC000013A: The application terminated as a result of a CTRL+C". | ||
| return exitCode + " (0x" + Integer.toHexString(exitCode).toUpperCase(Locale.ENGLISH) + ")"; | ||
| } | ||
| return String.valueOf(exitCode); | ||
| } | ||
|
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| private static Integer waitFor(Process process) throws InterruptedException { | ||
| long endTime = System.currentTimeMillis() + TIMEOUT_MILLIS; | ||
| int i = 0; | ||
| do { | ||
| try { | ||
| return process.exitValue(); | ||
| } | ||
| catch (IllegalThreadStateException ignore) { | ||
| Thread.sleep(i++ < 3 ? 10 : i < 5 ? 30 : 100); | ||
| } | ||
| } while (System.currentTimeMillis() < endTime); | ||
| return null; | ||
| } | ||
|
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| private static class StreamGobbler implements Runnable { | ||
|
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| private final Reader reader; | ||
| private final StringBuilder myBuffer = new StringBuilder(); | ||
| private final Thread thread; | ||
| private boolean isStopped = false; | ||
|
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| private StreamGobbler(Reader reader) { | ||
| this.reader = reader; | ||
| this.thread = new Thread(this, "sendctrlc.exe output reader"); | ||
| this.thread.start(); | ||
| } | ||
|
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| public void run() { | ||
| char[] buf = new char[8192]; | ||
| try { | ||
| int readCount; | ||
| while (!isStopped && (readCount = reader.read(buf)) >= 0) { | ||
| myBuffer.append(buf, 0, readCount); | ||
| } | ||
| if (isStopped) { | ||
| myBuffer.append("Failed to read output: force stopped"); | ||
| } | ||
| } | ||
| catch (Exception e) { | ||
| myBuffer.append("Failed to read output: ").append(e.getClass().getName()).append(" raised"); | ||
| } | ||
| } | ||
|
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| private void stop() { | ||
| try { | ||
| this.thread.join(1000); // await to read whole buffered output | ||
| } catch (InterruptedException ignored) { | ||
| } | ||
| this.isStopped = true; | ||
| } | ||
|
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| private String getText() { | ||
| return myBuffer.toString(); | ||
| } | ||
| } | ||
| } |
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