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diff --git a/src/common/errors.h b/src/common/errors.h
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--- /dev/null
+++ b/src/common/errors.h
@@ -0,0 +1,80 @@
+/*  Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    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.
+
+    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, see <http://www.gnu.org/licenses/>.
+ */
+/*!
+ * \file errors.h
+ *
+ * \author Lubos Slovak <lubos.slovak@nic.cz>
+ * \author Marek Vavrusa <marek.vavrusa@nic.cz>
+ *
+ * \brief Error codes and function for getting error message.
+ *
+ * \addtogroup common_lib
+ * @{
+ */
+
+#ifndef _KNOTD_COMMON_ERROR_H_
+#define _KNOTD_COMMON_ERROR_H_
+
+#include <errno.h>
+
+/*! \brief Error lookup table. */
+typedef struct error_table_t {
+	int id;
+	const char *name;
+} error_table_t;
+
+/*!
+ * \brief Returns error message for the given error code.
+ *
+ * \param table Table of error messages to use.
+ * \param code Error code.
+ *
+ * \return String containing the error message.
+ */
+const char *error_to_str(const error_table_t *table, int code);
+
+/*!
+ * \brief Safe errno mapper that automatically appends sentinel value.
+ *
+ * \see _map_errno()
+ *
+ * \param fallback_value Fallback error value (used if the code could not be
+ *                       mapped.
+ * \param err POSIX errno.
+ * \param ... List of handled codes.
+ *
+ * \return Mapped error code.
+ */
+#define map_errno(fallback_value, err...) _map_errno(fallback_value, err, 0)
+
+/*!
+ * \brief Returns a mapped POSIX errcode.
+ *
+ * \warning Last error must be 0, it serves as a sentinel value.
+ *          Use map_errno() instead.
+ *
+ * \param fallback_value Fallback error value (used if the code could not be
+ *                       mapped.
+ * \param arg0 First mandatory argument.
+ * \param ... List of handled codes.
+ *
+ * \return Mapped error code.
+ */
+int _map_errno(int fallback_value, int arg0, ...);
+
+#endif /* _KNOTD_COMMON_ERROR_H_ */
+
+/*! @} */