log.c: Added basic logging support.

src/log.h

@@ -0,0 +1,30 @@
+/* log.h
+ *
+ *   Copyright (C) 2010   Henrik Hautakoski <henrik@fiktivkod.org>
+ *
+ *   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 3 of the License, or
+ *   (at your option) any later version.
+ */
+#ifndef __LOG_H
+#define __LOG_H
+
+#include <stdarg.h>
+#include <stddef.h>
+
+#define LOG_INFO  (1<<0)
+#define LOG_WARN  (1<<1) 
+#define LOG_CRIT  (1<<2)
+#define LOG_DEBUG (1<<3)
+#define LOG_ALL   (LOG_INFO | LOG_WARN | LOG_CRIT | LOG_DEBUG)
+
+void init_log(unsigned level, const char *path);
+
+const char* loglvltostr(unsigned level);
+
+void logmsg(unsigned level, const char *fmt, ...);
+
+void logerrno(unsigned level, const char *prefix, int err);
+
+#endif /* __LOG_H */