test/java/lang/Runtime/exec/SleepyCat.java

*** 71,82 ****
          // reproducible not only for the obvious reason, but also for
          // the subtle reason that it makes reading /proc/getppid()/fd
          // slower, making the child more likely to win the race!
          int iterations = 20;
          int timeout = 30;
!         String[] catArgs   = new String[] {"/bin/cat"};
!         String[] sleepArgs = new String[] {"/bin/sleep",
                                              String.valueOf(timeout+1)};
          Process[] cats   = new Process[iterations];
          Process[] sleeps = new Process[iterations];
          Timer timer = new Timer(true);
          TimeoutTask catExecutioner = new TimeoutTask(cats);
--- 71,82 ----
          // reproducible not only for the obvious reason, but also for
          // the subtle reason that it makes reading /proc/getppid()/fd
          // slower, making the child more likely to win the race!
          int iterations = 20;
          int timeout = 30;
!         String[] catArgs   = new String[] {UnixCommands.cat()};
!         String[] sleepArgs = new String[] {UnixCommands.sleep(),
                                              String.valueOf(timeout+1)};
          Process[] cats   = new Process[iterations];
          Process[] sleeps = new Process[iterations];
          Timer timer = new Timer(true);
          TimeoutTask catExecutioner = new TimeoutTask(cats);
*** 124,135 ****
          Process[] backgroundSleepers = new Process[iterations];
          TimeoutTask sleeperExecutioner = new TimeoutTask(backgroundSleepers);
          timer.schedule(sleeperExecutioner, timeout * 1000);
          byte[] buffer = new byte[10];
          String[] args =
!             new String[] {"/bin/sh", "-c",
!                           "exec sleep " + (timeout+1) + " >/dev/null"};
  
          for (int i = 0;
               i < backgroundSleepers.length && !sleeperExecutioner.timedOut();
               ++i) {
              backgroundSleepers[i] = rt.exec(args); // race condition here
--- 124,136 ----
          Process[] backgroundSleepers = new Process[iterations];
          TimeoutTask sleeperExecutioner = new TimeoutTask(backgroundSleepers);
          timer.schedule(sleeperExecutioner, timeout * 1000);
          byte[] buffer = new byte[10];
          String[] args =
!             new String[] {UnixCommands.sh(), "-c",
!                           "exec " + UnixCommands.sleep() + " "
!                                   + (timeout+1) + " >/dev/null"};
  
          for (int i = 0;
               i < backgroundSleepers.length && !sleeperExecutioner.timedOut();
               ++i) {
              backgroundSleepers[i] = rt.exec(args); // race condition here
*** 151,164 ****
              System.out.println("Child process has two (should be one) writable pipe fds for its stdout.");
          return sleeperExecutioner.timedOut();
      }
  
      public static void main (String[] args) throws Exception {
!         try {
              if (hang1() | hang2())
                  throw new Exception("Read from closed pipe hangs");
-         } catch (IOException e) {
-             // We will get here on non-Posix systems,
-             // which don't have cat and sleep and sh.
-         }
      }
  }
--- 152,166 ----
              System.out.println("Child process has two (should be one) writable pipe fds for its stdout.");
          return sleeperExecutioner.timedOut();
      }
  
      public static void main (String[] args) throws Exception {
!         if (! UnixCommands.isUnix) {
!             System.out.println("For UNIX only");
!             return;
!         }
!         UnixCommands.ensureCommandsAvailable("sh", "cat", "sleep");
! 
          if (hang1() | hang2())
              throw new Exception("Read from closed pipe hangs");
      }
  }