gt:             int len = s.read();
context: /*
   * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   *
   */
  
  import java.io.File;
  import java.io.FileReader;
  import java.io.FileWriter;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.io.Reader;
  import java.io.Writer;
  import java.util.Arrays;
  import java.util.List;
  
  /*
   * @test PipelineTest
   */
  
  public class PipelineTest {
  
      private static void realMain(String[] args) throws Throwable {
          t1_simplePipeline();
          t2_translatePipeline();
          t3_redirectErrorStream();
          t4_failStartPipeline();
      }
  
      /**
       * Return a list of the varargs arguments.
       * @param args elements to include in the list
       * @param <T> the type of the elements
       * @return a {@code List<T>} of the arguments
       */
      @SafeVarargs
      @SuppressWarnings("varargs")
      static <T> List<T> asList(T... args) {
          return Arrays.asList(args);
      }
  
      /**
       * T1 - simple copy between two processes
       */
      static void t1_simplePipeline() {
          try {
              String s1 = "Now is the time to check!";
              verify(s1, s1,
                      asList(new ProcessBuilder("cat")));
              verify(s1, s1,
                      asList(new ProcessBuilder("cat"),
                              new ProcessBuilder("cat")));
              verify(s1, s1,
                      asList(new ProcessBuilder("cat"),
                              new ProcessBuilder("cat"),
                              new ProcessBuilder("cat")));
          } catch (Throwable t) {
              unexpected(t);
          }
      }
  
      /**
       * Pipeline that modifies the content.
       */
      static void t2_translatePipeline() {
          try {
              String s2 = "Now is the time to check!";
              String r2 = s2.replace('e', 'E').replace('o', 'O');
              verify(s2, r2,
                      asList(new ProcessBuilder("tr", "e", "E"),
                              new ProcessBuilder("tr", "o", "O")));
          } catch (Throwable t) {
              unexpected(t);
          }
      }
  
      /**
       * Test that redirectErrorStream sends standard error of the first process
       * to the standard output. The standard error of the first process should be empty.
       * The standard output of the 2nd should contain the error message including the bad file name.
       */
      static void t3_redirectErrorStream() {
          try {
              File p1err = new File("p1-test.err");
              File p2out = new File("p2-test.out");
  
              List<Process> processes = ProcessBuilder.startPipeline(
                      asList(new ProcessBuilder("cat", "NON-EXISTENT-FILE")
                                      .redirectErrorStream(true)
                                      .redirectError(p1err),
                              new ProcessBuilder("cat").redirectOutput(p2out)));
              waitForAll(processes);
  
              check("".equals(fileContents(p1err)), "The first process standard error should be empty");
              String p2contents = fileContents(p2out);
              check(p2contents.contains("NON-EXISTENT-FILE"),
                      "The error from the first process should be in the output of the second: " + p2contents);
          } catch (Throwable t) {
              unexpected(t);
          }
      }
  
      /**
       * Test that no processes are left after a failed startPipeline.
       * Test illegal combinations of redirects.
       */
      static void t4_failStartPipeline() {
          File p1err = new File("p1-test.err");
          File p2out = new File("p2-test.out");
  
          THROWS(IllegalArgumentException.class,
                  () -> {
                      // Test that output redirect != PIPE throws IAE
                      List<Process> processes = ProcessBuilder.startPipeline(
                              asList(new ProcessBuilder("cat", "NON-EXISTENT-FILE1")
                                              .redirectOutput(p1err),
                                      new ProcessBuilder("cat")));
                  },
                  () -> {
                      // Test that input redirect != PIPE throws IAE
                      List<Process> processes = ProcessBuilder.startPipeline(
                              asList(new ProcessBuilder("cat", "NON-EXISTENT-FILE2"),
                                      new ProcessBuilder("cat").redirectInput(p2out)));
                  }
          );
  
          THROWS(NullPointerException.class,
                  () -> {
                      List<Process> processes = ProcessBuilder.startPipeline(
                              asList(new ProcessBuilder("cat", "a"), null));
                  },
                  () -> {
                      List<Process> processes = ProcessBuilder.startPipeline(
                              asList(null, new ProcessBuilder("cat", "b")));
                  }
          );
  
          THROWS(IOException.class,
                  () -> {
                      List<Process> processes = ProcessBuilder.startPipeline(
                              asList(new ProcessBuilder("cat", "c"),
                                      new ProcessBuilder("NON-EXISTENT-COMMAND")));
                  });
  
          // Check no subprocess are left behind
          ProcessHandle.current().children().forEach(PipelineTest::print);
          ProcessHandle.current().children()
                  .filter(p -> p.info().command().orElse("").contains("cat"))
                  .forEach(p -> fail("process should have been destroyed: " + p));
      }
  
      static void verify(String input, String expected, List<ProcessBuilder> builders) throws IOException {
          File infile = new File("test.in");
          File outfile = new File("test.out");
          setFileContents(infile, expected);
          for (int i = 0; i < builders.size(); i++) {
              ProcessBuilder b = builders.get(i);
              if (i == 0) {
                  b.redirectInput(infile);
              }
              if (i == builders.size() - 1) {
                  b.redirectOutput(outfile);
              }
          }
          List<Process> processes = ProcessBuilder.startPipeline(builders);
          verifyProcesses(processes);
          waitForAll(processes);
          String result = fileContents(outfile);
          System.out.printf(" in: %s%nout: %s%n", input, expected);
          check(result.equals(expected), "result not as expected");
      }
  
      /**
       * Wait for each of the processes to be done.
       *
       * @param processes the list  of processes to check
       */
      static void waitForAll(List<Process> processes) {
          processes.forEach(p -> {
              try {
                  int status = p.waitFor();
              } catch (InterruptedException ie) {
                  unexpected(ie);
              }
          });
      }
  
      static void print(ProcessBuilder pb) {
          if (pb != null) {
              System.out.printf(" pb: %s%n", pb);
              System.out.printf("    cmd: %s%n", pb.command());
          }
      }
  
      static void print(ProcessHandle p) {
          System.out.printf("process: pid: %d, info: %s%n",
                  p.getPid(), p.info());
      }
  
      // Check various aspects of the processes
      static void verifyProcesses(List<Process> processes) {
          for (int i = 0; i < processes.size(); i++) {
              Process p = processes.get(i);
              if (i != 0) {
                  verifyNullStream(p.getOutputStream(), "getOutputStream");
              }
              if (i == processes.size() - 1) {
                  verifyNullStream(p.getInputStream(), "getInputStream");
                  verifyNullStream(p.getErrorStream(), "getErrorStream");
              }
          }
      }
  
      static void verifyNullStream(OutputStream s, String msg) {
          try {
              s.write(0xff);
              fail("Stream should have been a NullStream" + msg);
          } catch (IOException ie) {
              // expected
          }
      }
  
      static void verifyNullStream(InputStream s, String msg) {
          try {
  