+/* Many OVS functions return an int which is one of:
+ * - 0: no error yet
+ * - >0: errno value
+ * - EOF: end of file (not necessarily an error; depends on the function called)
+ *
+ * Returns the appropriate human-readable string. The caller must copy the
+ * string if it wants to hold onto it, as the storage may be overwritten on
+ * subsequent function calls.
+ */
+const char *
+ovs_retval_to_string(int retval)
+{
+ static char unknown[48];
+
+ if (!retval) {
+ return "";
+ }
+ if (retval > 0) {
+ return strerror(retval);
+ }
+ if (retval == EOF) {
+ return "End of file";
+ }
+ snprintf(unknown, sizeof unknown, "***unknown return value: %d***", retval);
+ return unknown;
+}
+