X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvpp-api%2Fvapi%2Fvapi_common.h;h=764a0b71f50c0b8972b277f718730591fb3ed50b;hb=fd67ece3d3eda0bd896aaa166d89b4f8e7f4e98f;hp=ce64469d02cd94f34a004282b0889cdb8b44dd73;hpb=e4bb5bc7c153ec1b26abae00461aaf19f5541419;p=vpp.git

diff --git a/src/vpp-api/vapi/vapi_common.h b/src/vpp-api/vapi/vapi_common.h
index ce64469d02c..764a0b71f50 100644
--- a/src/vpp-api/vapi/vapi_common.h
+++ b/src/vpp-api/vapi/vapi_common.h
@@ -52,7 +52,9 @@ typedef enum
   VAPI_WAIT_FOR_READ_WRITE,  /**< wait until a read or write can be done */
 } vapi_wait_mode_e;
 
-typedef int vapi_msg_id_t;
+typedef unsigned int vapi_msg_id_t;
+
+#define INVALID_MSG_ID ((vapi_msg_id_t)(~0))
 
 #ifdef __cplusplus
 }