PhabricatorDaemonReference.php
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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;
	}

	}