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PhabricatorDaemonReference.php
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			<?php

			// TODO: See T13321. After the removal of daemon PID files this class
			// no longer makes as much sense as it once did.

			final class PhabricatorDaemonReference extends Phobject {

			public static function isProcessRunning($pid) {
			if (!$pid) {
			return false;
			}

			if (function_exists('posix_kill')) {
			// This may fail if we can't signal the process because we are running as
			// a different user (for example, we are 'apache' and the process is some
			// other user's, or we are a normal user and the process is root's), but
			// we can check the error code to figure out if the process exists.
			$is_running = posix_kill($pid, 0);
			if (posix_get_last_error() == 1) {
			// "Operation Not Permitted", indicates that the PID exists. If it
			// doesn't, we'll get an error 3 ("No such process") instead.
			$is_running = true;
			}
			} else {
			// If we don't have the posix extension, just exec.
			list($err) = exec_manual('ps %s', $pid);
			$is_running = ($err == 0);
			}

			return $is_running;
			}

			}