russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
115 lines
4.2 KiB
Java
115 lines
4.2 KiB
Java
/*
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* Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2026, IBM Corp.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test id=FORK
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* @bug 8377907
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* @summary Check that we don't open pipes without CLOEXCEC
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* @requires os.family == "linux"
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* @requires vm.flagless
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* @library /test/lib
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* @run main/othervm/native -Djdk.lang.Process.launchMechanism=FORK PipesCloseOnExecTest
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*/
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/*
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* @test id=VFORK
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* @bug 8377907
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* @summary Check that we don't open pipes without CLOEXCEC
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* @requires os.family == "linux"
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* @requires vm.flagless
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* @library /test/lib
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* @run main/othervm/native -Djdk.lang.Process.launchMechanism=VFORK PipesCloseOnExecTest
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*/
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/*
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* @test id=POSIX_SPAWN
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* @bug 8377907
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* @summary Check that we don't open pipes without CLOEXCEC
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* @requires os.family == "linux"
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* @requires vm.flagless
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* @library /test/lib
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* @run main/othervm/native -Djdk.lang.Process.launchMechanism=POSIX_SPAWN PipesCloseOnExecTest
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*/
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import jdk.test.lib.process.OutputAnalyzer;
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import java.io.IOException;
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import java.time.LocalTime;
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public class PipesCloseOnExecTest {
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// How this works:
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// - We start a child process A. Does not matter what, we just call "/bin/date".
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// - Concurrently, we (natively, continuously) iterate all pipe file descriptors in
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// the process and count all those that are not tagged with CLOEXEC. Finding one
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// counts as error.
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// Note that this test can only reliably succeed with Linux and the xxxBSDs, where
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// we have pipe2(2).
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//
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// On MacOs and AIX, we emulate pipe2(2) with pipe(2) and fcntl(2); therefore we
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// have a tiny time window in which a concurrent thread can can observe pipe
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// filedescriptors without CLOEXEC. Furthermore, on MacOS, we also have to employ
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// the double-dup-trick to workaround a the buggy MacOS implementation of posix_spawn.
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// Therefore, on these platforms, the test would (correctly) spot "bad" file descriptors.
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native static boolean startTester();
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native static boolean stopTester();
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static final int num_tries = 100;
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static void printOpenFileDescriptors() {
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long mypid = ProcessHandle.current().pid();
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try(Process p = new ProcessBuilder("lsof", "-p", Long.toString(mypid))
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.inheritIO().start()) {
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p.waitFor();
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} catch (InterruptedException | IOException ignored) {
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// Quietly swallow; it was just an attempt.
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}
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}
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public static void main(String[] args) throws Exception {
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System.out.println("jdk.lang.Process.launchMechanism=" +
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System.getProperty("jdk.lang.Process.launchMechanism"));
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System.loadLibrary("PipesCloseOnExec");
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if (!startTester()) {
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throw new RuntimeException("Failed to start testers (see stdout)");
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}
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System.out.println(LocalTime.now() + ": Call ProcessBuilder.start...");
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for (int i = 0; i < num_tries; i ++) {
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ProcessBuilder pb = new ProcessBuilder("true").inheritIO();
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new OutputAnalyzer(pb.start()).shouldHaveExitValue(0);
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}
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if (!stopTester()) {
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printOpenFileDescriptors();
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throw new RuntimeException("Catched FDs without CLOEXEC? Check output.");
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}
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}
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}
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