errcode: added ETIMEOUT error code

src/common/errcode.c

@@ -66,6 +66,7 @@ const error_table_t knot_error_msgs[] = {
 	{ KNOT_EXFRREFUSED, "Zone transfer refused by the server." },
 	{ KNOT_EDENIED, "Not allowed." },
 	{ KNOT_ECONN, "Connection reset." },
+	{ KNOT_ETIMEOUT, "Connection timeout." },
 	{ KNOT_EIXFRSPACE, "IXFR reply did not fit in." },
 	{ KNOT_ECNAME, "CNAME loop found in zone." },
 	{ KNOT_ENODIFF, "Cannot create zone diff." },

src/common/errcode.h

@@ -85,6 +85,7 @@ enum knot_error {
 	KNOT_EXFRREFUSED,     /*!< Zone transfer refused by the server. */
 	KNOT_EDENIED,         /*!< Not allowed. */
 	KNOT_ECONN,           /*!< Connection reset. */
+	KNOT_ETIMEOUT,        /*!< Connection timeout. */
 	KNOT_EIXFRSPACE,      /*!< IXFR reply did not fit in. */
 	KNOT_ECNAME,          /*!< CNAME loop found in zone. */
 	KNOT_ENODIFF,         /*!< No zone diff can be created. */

src/knot/server/tcp-handler.c

@@ -242,7 +242,7 @@ int tcp_recv_data(int fd, uint8_t *buf, int len, struct timeval *timeout)
 			if (ret) {
 				continue;
 			} else {
-				return KNOT_EBUSY;
+				return KNOT_ETIMEOUT;
 			}
 		} else {
 			return KNOT_ECONN;