--- /dev/null
+(*
+ * Copyright (C) 2003-2004:
+ * Stefano Zacchiroli <zack@cs.unibo.it>
+ * for the HELM Team http://helm.cs.unibo.it/
+ *
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ *
+ * HELM 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * HELM 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 HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ *
+ * For details, see the HELM World-Wide-Web page,
+ * http://helm.cs.unibo.it/
+ *)
+
+(** {2 Debugger and logger} *)
+
+ (** log level
+ * 0 -> logging disabled
+ * 1 -> standard logging
+ * >=2 -> verbose logging
+ * default is 1 *)
+val get_log_level: unit -> int
+val set_log_level: int -> unit
+
+ (** log a message through the logger with a given log level
+ * level defaults to 1, higher level denotes more verbose messages which are
+ * ignored with the default log_level *)
+val log: ?level: int -> string -> unit
+
+ (** if set to Some fname, fname will be used as a logfile, otherwise stderr
+ * will be used *)
+val get_log_file: unit -> string option
+val set_log_file: string option -> unit
+val close_log_file: unit -> unit
+