8067796: (process) Process.waitFor(timeout, unit) doesn't throw NPE if timeout...

8067796: (process) Process.waitFor(timeout, unit) doesn't throw NPE if timeout is less than, or equal to zero when unit == null
Summary: Implement checking for NPE in Process implementation before other conditions
Reviewed-by: martin, chegar, aph, andrew

src/solaris/classes/java/lang/UNIXProcess.java

@@ -401,12 +401,11 @@ final class UNIXProcess extends Process {
     public synchronized boolean waitFor(long timeout, TimeUnit unit)
         throws InterruptedException
     {
+        long remainingNanos = unit.toNanos(timeout);    // throw NPE before other conditions
         if (hasExited) return true;
         if (timeout <= 0) return false;
 
-        long remainingNanos = unit.toNanos(timeout);
         long deadline = System.nanoTime() + remainingNanos;
-
         do {
             TimeUnit.NANOSECONDS.timedWait(this, remainingNanos);
             if (hasExited) {

src/windows/classes/java/lang/ProcessImpl.java

@@ -516,12 +516,11 @@ final class ProcessImpl extends Process {
     public boolean waitFor(long timeout, TimeUnit unit)
         throws InterruptedException
     {
+        long remainingNanos = unit.toNanos(timeout);    // throw NPE before other conditions
         if (getExitCodeProcess(handle) != STILL_ACTIVE) return true;
         if (timeout <= 0) return false;
 
-        long remainingNanos  = unit.toNanos(timeout);
         long deadline = System.nanoTime() + remainingNanos;
-
         do {
             // Round up to next millisecond
             long msTimeout = TimeUnit.NANOSECONDS.toMillis(remainingNanos + 999_999L);

test/java/lang/ProcessBuilder/Basic.java

@@ -27,6 +27,7 @@
  *      5026830 5023243 5070673 4052517 4811767 6192449 6397034 6413313
  *      6464154 6523983 6206031 4960438 6631352 6631966 6850957 6850958
  *      4947220 7018606 7034570 4244896 5049299
+ *      8067796
  * @summary Basic tests for Process and Environment Variable code
  * @run main/othervm/timeout=300 Basic
  * @run main/othervm/timeout=300 -Djdk.lang.Process.launchMechanism=fork Basic
@@ -2366,6 +2367,56 @@ public class Basic {
             p.destroy();
         } catch (Throwable t) { unexpected(t); }
 
+        //----------------------------------------------------------------
+        // Check that Process.waitFor(timeout, null) throws NPE.
+        //----------------------------------------------------------------
+        try {
+            List<String> childArgs = new ArrayList<String>(javaChildArgs);
+            childArgs.add("sleep");
+            final Process p = new ProcessBuilder(childArgs).start();
+            THROWS(NullPointerException.class,
+                    () ->  p.waitFor(10L, null));
+            THROWS(NullPointerException.class,
+                    () ->  p.waitFor(0L, null));
+            THROWS(NullPointerException.class,
+                    () -> p.waitFor(-1L, null));
+            // Terminate process and recheck after it exits
+            p.destroy();
+            p.waitFor();
+            THROWS(NullPointerException.class,
+                    () -> p.waitFor(10L, null));
+            THROWS(NullPointerException.class,
+                    () -> p.waitFor(0L, null));
+            THROWS(NullPointerException.class,
+                    () -> p.waitFor(-1L, null));
+        } catch (Throwable t) { unexpected(t); }
+
+        //----------------------------------------------------------------
+        // Check that default implementation of Process.waitFor(timeout, null) throws NPE.
+        //----------------------------------------------------------------
+        try {
+            List<String> childArgs = new ArrayList<String>(javaChildArgs);
+            childArgs.add("sleep");
+            final Process proc = new ProcessBuilder(childArgs).start();
+            final DelegatingProcess p = new DelegatingProcess(proc);
+
+            THROWS(NullPointerException.class,
+                    () ->  p.waitFor(10L, null));
+            THROWS(NullPointerException.class,
+                    () ->  p.waitFor(0L, null));
+            THROWS(NullPointerException.class,
+                    () ->  p.waitFor(-1L, null));
+            // Terminate process and recheck after it exits
+            p.destroy();
+            p.waitFor();
+            THROWS(NullPointerException.class,
+                    () -> p.waitFor(10L, null));
+            THROWS(NullPointerException.class,
+                    () -> p.waitFor(0L, null));
+            THROWS(NullPointerException.class,
+                    () -> p.waitFor(-1L, null));
+        } catch (Throwable t) { unexpected(t); }
+
         //----------------------------------------------------------------
         // Check the default implementation for
         // Process.waitFor(long, TimeUnit)