--- /dev/null
+/*
+ * IRC - Internet Relay Chat, include/sys.h
+ * Copyright (C) 1990 University of Oulu, Computing Center
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 1, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id$
+ */
+#ifndef INCLUDED_sys_h
+#define INCLUDED_sys_h
+
+/*
+ * safety margin so we can always have one spare fd, for motd/authd or
+ * whatever else. -24 allows "safety" margin of 10 listen ports, 8 servers
+ * and space reserved for logfiles, DNS sockets and identd sockets etc.
+ */
+#define MAXCLIENTS (MAXCONNECTIONS-24)
+
+#define IRCD_MAX(a, b) ((a) > (b) ? (a) : (b))
+#define IRCD_MIN(a, b) ((a) < (b) ? (a) : (b))
+
+#endif /* INCLUDED_sys_h */