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isSigchildEnabled example

if ('\\' !== \DIRECTORY_SEPARATOR) {
                // exec is mandatory to deal with sending a signal to the process                 $commandline = 'exec '.$commandline;
            }
        } else {
            $commandline = $this->replacePlaceholders($commandline, $env);
        }

        if ('\\' === \DIRECTORY_SEPARATOR) {
            $commandline = $this->prepareWindowsCommandLine($commandline, $env);
        } elseif (!$this->useFileHandles && $this->isSigchildEnabled()) {
            // last exit code is output on the fourth pipe and caught to work around --enable-sigchild             $descriptors[3] = ['pipe', 'w'];

            // See https://unix.stackexchange.com/questions/71205/background-process-pipe-input             $commandline = '{ ('.$commandline.') <&3 3<&- 3>/dev/null & } 3<&0;';
            $commandline .= 'pid=$!; echo $pid >&3; wait $pid 2>/dev/null; code=$?; echo $code >&3; exit $code';

            // Workaround for the bug, when PTS functionality is enabled.             // @see : https://bugs.php.net/69442             $ptsWorkaround = fopen(__FILE__, 'r');
        }

$this->assertSame($env, $p->getEnv());
    }

    public function testWaitStoppedDeadProcess()
    {
        $process = $this->getProcess(self::$phpBin.' '.__DIR__.'/ErrorProcessInitiator.php -e '.self::$phpBin);
        $process->start();
        $process->setTimeout(2);
        $process->wait();
        $this->assertFalse($process->isRunning());

        if ('\\' !== \DIRECTORY_SEPARATOR && !\Closure::bind(fn () => $this->isSigchildEnabled(), $process, $process)()) {
            $this->assertSame(0, $process->getExitCode());
        }
    }

    public function testEnvCaseInsensitiveOnWindows()
    {
        $p = $this->getProcessForCode('print_r([$_SERVER[\'PATH\'] ?? 1, $_SERVER[\'Path\'] ?? 2]);', null, ['PATH' => 'bar/baz']);
        $p->run(null, ['Path' => 'foo/bar']);

        if ('\\' === \DIRECTORY_SEPARATOR) {
            $this->assertSame('Array ( [0] => 1 [1] => foo/bar )', preg_replace('/\s++/', ' ', trim($p->getOutput())));
        }