Implement Unix task time limit

Author: Vectorial1024

README.md

@@ -30,6 +30,11 @@ via Composer:
 composer require vectorial1024/laravel-process-async
 ```
 
+Additionally:
+
+- For Unix systems (e.g. MacOS, Ubuntu, ...), the following are also required:
+  - GNU Core Utilities (`coreutils`, most probably preinstalled already)
+
 This library supports Unix and Windows; see the Testing section for more details.
 
 ## Change log

src/AsyncTask.php

@@ -94,7 +94,12 @@ public function start(): void
         }
         // assume anything not windows to be unix
         // unix use nohup
-        $this->runnerProcess = Process::quietly()->start("nohup $baseCommand");
+        // check time limit settings
+        $timeoutClause = "";
+        if ($this->timeLimit > 0) {
+            $timeoutClause = "timeout {$this->timeLimit}";
+        }
+        $this->runnerProcess = Process::quietly()->start("nohup $timeoutClause $baseCommand");
     }
 
     /**