Fail fast without waiting for timeout if process dies while connecting

src/Factory.php

@@ -305,6 +305,16 @@ private function openSocketIo($filename, $flags = null)
             $deferred->reject(new \RuntimeException('No connection detected'));
         });
 
+        $process->on('exit', function () use ($deferred, $server, $timeout) {
+            $this->loop->cancelTimer($timeout);
+            if (is_resource($server)) {
+                $this->loop->removeReadStream($server);
+                fclose($server);
+            }
+
+            $deferred->reject(new \RuntimeException('Database process died while setting up connection'));
+        });
+
         $this->loop->addReadStream($server, function () use ($server, $timeout, $filename, $flags, $deferred, $process) {
             // accept once connection on server socket and stop server socket
             $this->loop->cancelTimer($timeout);

tests/FunctionalFactoryTest.php

@@ -61,7 +61,9 @@ public function testOpenReturnsPromiseWhichRejectsWithExceptionWhenPathIsInvalid
             echo 'Error: ' . $e->getMessage() . PHP_EOL;
         });
 
-        $this->expectOutputString('Error: Unable to open database: unable to open database file' . PHP_EOL);
+        // Unable to open database: unable to open database file
+        // Unable to open database: bad parameter or other API misuse (only between PHP 7.4.0 and PHP 7.4.7 as per https://3v4l.org/9SjgK)
+        $this->expectOutputRegex('/^' . preg_quote('Error: Unable to open database: ', '/') . '.*$/');
         Loop::run();
     }
 
@@ -82,7 +84,7 @@ public function testOpenReturnsPromiseWhichRejectsWithExceptionWhenExplicitPhpBi
             echo 'Error: ' . $e->getMessage() . PHP_EOL;
         });
 
-        $this->expectOutputString('Error: No connection detected' . PHP_EOL);
+        $this->expectOutputString('Error: Database process died while setting up connection' . PHP_EOL);
         Loop::run();
     }
 }