--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/applib/dtn_errno.c	Thu Apr 21 14:57:45 2011 +0100
@@ -0,0 +1,50 @@
+/*
+ *    Copyright 2007 Intel Corporation
+ * 
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ * 
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+#include <stdio.h>
+#include "dtn_errno.h"
+
+//----------------------------------------------------------------------
+char*
+dtn_strerror(int err)
+{
+    switch(err) {
+    case DTN_SUCCESS: 	return "success";
+    case DTN_EINVAL: 	return "invalid argument";
+    case DTN_EXDR: 	return "error in xdr routines";
+    case DTN_ECOMM: 	return "error in ipc communication";
+    case DTN_ECONNECT: 	return "error connecting to server";
+    case DTN_ETIMEOUT: 	return "operation timed out";
+    case DTN_ESIZE: 	return "payload too large";
+    case DTN_ENOTFOUND: return "not found";
+    case DTN_EINTERNAL: return "internal error";
+    case DTN_EINPOLL:   return "illegal operation called after dtn_poll";
+    case DTN_EBUSY:     return "registration already in use";
+    case DTN_EVERSION:  return "ipc version mismatch";
+    case DTN_EMSGTYPE:  return "unknown ipc message type";
+    case DTN_ENOSPACE:	return "no storage space";
+    case -1:            return "(invalid error code -1)";
+    }
+
+    // there's a small race condition here in case there are two
+    // simultaneous calls that will clobber the same buffer, but this
+    // should be rare and the worst that happens is that the output
+    // string is garbled
+    static char buf[128];
+    snprintf(buf, sizeof(buf), "(unknown error %d)", err);
+    return buf;
+}
+