| /* |
| * Copyright (c) 2002, 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. |
| */ |
| |
| /* @test |
| * @bug 4763384 |
| * @summary Ensure that piped input always works with exec'd processes |
| */ |
| |
| import java.io.*; |
| |
| |
| /** |
| * This class demonstrates a regression in java1.4.1 in the handling of the |
| * Process OutputStream (exec'd process stdin). The subprocess completes 100% |
| * of the time in 1.4, but about only about 50% of the time under 1.4.1. Issue |
| * exists for client JVM, Linux Redhat 6.2 not sure about other variants of |
| * Linux or other OSes, or server JVM. |
| */ |
| |
| public class ExecWithInput { |
| |
| private static final int N = 200; |
| |
| static int go(int i) throws Exception { |
| /* |
| * Execute /bin/cat supplying two lines of input. cat should |
| * read the input lines and copy them to stdout. On completion, |
| * p.waitFor should return and the exit status is printed and this |
| * program exits. Under 1.4.1, cat sometimes gets stuck on a pipe |
| * read and never terminates. |
| */ |
| Process p = Runtime.getRuntime().exec(UnixCommands.cat()); |
| |
| String input = i + ": line 1\n" + i + ": line 2\n"; |
| StringBufferInputStream in = new StringBufferInputStream(input); |
| // create threads to handle I/O streams |
| IO ioIn = new IO("stdin", in, p.getOutputStream()); |
| IO ioOut = new IO("stdout", p.getInputStream(), System.out); |
| IO ioErr = new IO("stderr", p.getErrorStream(), System.err); |
| |
| // wait for process to exit |
| return p.waitFor(); |
| } |
| |
| public static void main(String[] args) throws Exception { |
| if (! UnixCommands.isLinux) { |
| System.out.println("For Linux only"); |
| return; |
| } |
| UnixCommands.ensureCommandsAvailable("cat"); |
| |
| for (int i = 0; i < N; i++) |
| go(i); |
| } |
| |
| /** |
| * Handle IO. Thread is started in constructor. |
| */ |
| static class IO extends Thread { |
| |
| private InputStream in; |
| private OutputStream out; |
| |
| IO(String name, InputStream in, OutputStream out) |
| { |
| this.in = in; |
| this.out = out; |
| setName(name); |
| start(); |
| } |
| |
| public void run() { |
| try { |
| byte[] buf = new byte[8192]; |
| int n; |
| while ((n = in.read(buf)) != -1) { |
| out.write(buf, 0, n); |
| out.flush(); |
| } |
| /* |
| while ((c = in.read()) != -1) { |
| out.write(c); |
| if (c == '\n') |
| out.flush(); |
| } |
| out.flush(); |
| */ |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } finally { |
| if (!System.out.equals(out) && !System.err.equals(out)) { |
| // Note: in order to get an exec'd java process to |
| // see EOF on input, it is necessary to close stdin |
| if (out != null) { |
| try { out.close(); } catch (Exception e) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| } |