QA - pcntl_signal - error when handler is int and not SIG_DFL or SIG_IGN

Closes GH-9001.

Author: juan-morales

ext/pcntl/tests/pcntl_signal_002.phpt

@@ -0,0 +1,16 @@
+--TEST--
+pcntl_signal() - If handler is an int value different than SIG_DFL or SIG_IGN
+--EXTENSIONS--
+pcntl
+--FILE--
+<?php
+
+try {
+    pcntl_signal(SIGTERM, -1);
+} catch (Error $error) {
+    echo $error->getMessage();
+}
+
+?>
+--EXPECT--
+pcntl_signal(): Argument #2 ($handler) must be either SIG_DFL or SIG_IGN when an integer value is given