Handle fsockopen() failure

.psalm/baseline.xml

@@ -899,6 +899,10 @@
       <code><![CDATA[nameAndVersion]]></code>
     </InternalMethod>
     <MissingThrowsDocblock>
+      <code><![CDATA[DefaultPrinter::from(
+                        $configuration->logfileTeamcity(),
+                    )]]></code>
+      <code><![CDATA[OutputFacade::printerFor($configuration->logfileJunit())]]></code>
       <code><![CDATA[atLeastVersion]]></code>
       <code><![CDATA[build]]></code>
       <code><![CDATA[configurationFile]]></code>
@@ -1153,6 +1157,9 @@
     <MissingThrowsDocblock>
       <code><![CDATA[DefaultPrinter::standardError()]]></code>
       <code><![CDATA[DefaultPrinter::standardError()]]></code>
+      <code><![CDATA[DefaultPrinter::standardError()]]></code>
+      <code><![CDATA[DefaultPrinter::standardOutput()]]></code>
+      <code><![CDATA[DefaultPrinter::standardOutput()]]></code>
       <code><![CDATA[DefaultPrinter::standardOutput()]]></code>
       <code><![CDATA[DefaultPrinter::standardOutput()]]></code>
       <code><![CDATA[DefaultPrinter::standardOutput()]]></code>

src/TextUI/Exception/CannotOpenSocketException.php

@@ -0,0 +1,30 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of PHPUnit.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PHPUnit\TextUI;
+
+use function sprintf;
+use RuntimeException;
+
+/**
+ * @internal This class is not covered by the backward compatibility promise for PHPUnit
+ */
+final class CannotOpenSocketException extends RuntimeException implements Exception
+{
+    public function __construct(string $hostname, int $port)
+    {
+        parent::__construct(
+            sprintf(
+                'Cannot open socket %s:%d',
+                $hostname,
+                $port,
+            ),
+        );
+    }
+}

src/TextUI/Output/Facade.php

@@ -17,6 +17,7 @@
 use PHPUnit\Logging\TestDox\TestResultCollection;
 use PHPUnit\Runner\DirectoryDoesNotExistException;
 use PHPUnit\TestRunner\TestResult\TestResult;
+use PHPUnit\TextUI\CannotOpenSocketException;
 use PHPUnit\TextUI\Configuration\Configuration;
 use PHPUnit\TextUI\InvalidSocketException;
 use PHPUnit\TextUI\Output\Default\ProgressPrinter\ProgressPrinter as DefaultProgressPrinter;
@@ -101,6 +102,7 @@ public static function printResult(TestResult $result, ?array $testDoxResult, Du
     }
 
     /**
+     * @throws CannotOpenSocketException
      * @throws DirectoryDoesNotExistException
      * @throws InvalidSocketException
      */

src/TextUI/Output/Printer/DefaultPrinter.php

@@ -20,6 +20,7 @@
 use function str_replace;
 use function str_starts_with;
 use PHPUnit\Runner\DirectoryDoesNotExistException;
+use PHPUnit\TextUI\CannotOpenSocketException;
 use PHPUnit\TextUI\InvalidSocketException;
 use PHPUnit\Util\Filesystem;
 
@@ -36,6 +37,7 @@ final class DefaultPrinter implements Printer
     private bool $isOpen;
 
     /**
+     * @throws CannotOpenSocketException
      * @throws DirectoryDoesNotExistException
      * @throws InvalidSocketException
      */
@@ -45,6 +47,7 @@ public static function from(string $out): self
     }
 
     /**
+     * @throws CannotOpenSocketException
      * @throws DirectoryDoesNotExistException
      * @throws InvalidSocketException
      */
@@ -54,6 +57,7 @@ public static function standardOutput(): self
     }
 
     /**
+     * @throws CannotOpenSocketException
      * @throws DirectoryDoesNotExistException
      * @throws InvalidSocketException
      */
@@ -63,6 +67,7 @@ public static function standardError(): self
     }
 
     /**
+     * @throws CannotOpenSocketException
      * @throws DirectoryDoesNotExistException
      * @throws InvalidSocketException
      */
@@ -77,7 +82,13 @@ private function __construct(string $out)
                 throw new InvalidSocketException($out);
             }
 
-            $this->stream = fsockopen($tmp[0], (int) $tmp[1]);
+            $stream = @fsockopen($tmp[0], (int) $tmp[1]);
+
+            if ($stream === false) {
+                throw new CannotOpenSocketException($tmp[0], (int) $tmp[1]);
+            }
+
+            $this->stream = $stream;
             $this->isOpen = true;
 
             return;