Added signal() and getPid() methods to Process

lib/Context/Process.php

@@ -232,6 +232,32 @@ class Process implements Context {
         });
     }
 
+    /**
+     * Send a signal to the process.
+     *
+     * @see \Amp\Process\Process::signal()
+     *
+     * @param int $signo
+     *
+     * @throws \Amp\Process\ProcessException
+     * @throws \Amp\Process\StatusError
+     */
+    public function signal(int $signo) {
+        $this->process->signal($signo);
+    }
+
+    /**
+     * Returns a promise resolving to the process PID.
+     *
+     * @see \Amp\Process\Process::getPid()
+     *
+     * @return \Amp\Promise
+     * @throws \Amp\Process\StatusError
+     */
+    public function getPid(): Promise {
+        return $this->process->getPid();
+    }
+
     /**
      * {@inheritdoc}
      */