And for a moment I thought StreamSelectLoop was unaffected

WyriHaximus · WyriHaximus · commit db0bda055fb8 · 2017-10-20T20:01:57.000+02:00
diff --git a/src/StreamSelectLoop.php b/src/StreamSelectLoop.php
@@ -32,8 +32,13 @@ public function __construct()
         $this->pcntl = extension_loaded('pcntl');
         $this->signals = new SignalsHandler(
             function ($signal) {
-                \pcntl_signal($signal, function ($signal) {
+                \pcntl_signal($signal, $f = function ($signal) use (&$f) {
                     $this->signals->call($signal);
+                    // Ensure there are two copies of the callable around until it has been executed.
+                    // For more information see: https://bugs.php.net/bug.php?id=62452
+                    // Only an issue for PHP 5, this hack can be removed once PHP 5 suppose has been dropped.
+                    $g = $f;
+                    $f = $g;
                 });
             },
             function ($signal) {
