diff --git a/deps/timeout/timeout.h b/deps/timeout/timeout.h
index 2c7fccb..40eaafb 100644
--- a/deps/timeout/timeout.h
+++ b/deps/timeout/timeout.h
@@ -26,6 +26,11 @@
 #ifndef TIMEOUT_H
 #define TIMEOUT_H
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 #include <stdbool.h> /* bool */
 #include <stdio.h>	 /* FILE */
 
@@ -259,4 +264,8 @@ TIMEOUT_PUBLIC struct timeout *timeouts_next(struct timeouts *, struct timeouts_
 #define timeouts_addf(T, to, timeout) \
 	timeouts_add((T), (to), timeouts_f2i((T), (timeout)))
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* TIMEOUT_H */
diff --git a/src/ip_reassembly/test/gtest_utils.h b/src/ip_reassembly/test/gtest_utils.h
index e037a29..0e652f2 100644
--- a/src/ip_reassembly/test/gtest_utils.h
+++ b/src/ip_reassembly/test/gtest_utils.h
@@ -1,13 +1,13 @@
 #ifndef _GTEST_UTILS_H
 #define _GTEST_UTILS_H
 
+#include <gtest/gtest.h>
+
 #ifdef __cplusplus
 extern "C"
 {
 #endif
 
-#include <gtest/gtest.h>
-
 #include "udp_utils.h"
 #include "tcp_utils.h"
 #include "ipv4_utils.h"
diff --git a/src/packet/packet_utils.cpp b/src/packet/packet_utils.cpp
index ad905e1..2653437 100644
--- a/src/packet/packet_utils.cpp
+++ b/src/packet/packet_utils.cpp
@@ -176,7 +176,10 @@ void packet_set_direction(struct packet *pkt, int dir)
     {
         marsio_buff_t *mbuff = (marsio_buff_t *)packet_get_io_ctx(pkt);
         assert(mbuff != NULL);
-        marsio_buff_set_metadata(mbuff, MR_BUFF_DIR, &dir, sizeof(dir));
+        if (marsio_buff_set_metadata(mbuff, MR_BUFF_DIR, &dir, sizeof(dir)) != 0)
+        {
+            PACKET_LOG_ERROR("failed to set direction");
+        }
     }
 }
 
@@ -188,7 +191,10 @@ int packet_get_direction(const struct packet *pkt)
     {
         marsio_buff_t *mbuff = (marsio_buff_t *)packet_get_io_ctx(pkt);
         assert(mbuff != NULL);
-        marsio_buff_get_metadata(mbuff, MR_BUFF_DIR, &direction, sizeof(direction));
+        if (marsio_buff_get_metadata(mbuff, MR_BUFF_DIR, &direction, sizeof(direction)) <= 0)
+        {
+            PACKET_LOG_ERROR("failed to get direction");
+        }
     }
 
     return direction;
@@ -200,7 +206,10 @@ void packet_set_session_id(struct packet *pkt, uint64_t sess_id)
     {
         marsio_buff_t *mbuff = (marsio_buff_t *)packet_get_io_ctx(pkt);
         assert(mbuff != NULL);
-        marsio_buff_set_metadata(mbuff, MR_BUFF_SESSION_ID, &sess_id, sizeof(sess_id));
+        if (marsio_buff_set_metadata(mbuff, MR_BUFF_SESSION_ID, &sess_id, sizeof(sess_id)) != 0)
+        {
+            PACKET_LOG_ERROR("failed to set session id");
+        }
     }
 }
 
@@ -211,7 +220,10 @@ uint64_t packet_get_session_id(const struct packet *pkt)
     {
         marsio_buff_t *mbuff = (marsio_buff_t *)packet_get_io_ctx(pkt);
         assert(mbuff != NULL);
-        marsio_buff_get_metadata(mbuff, MR_BUFF_SESSION_ID, &sess_id, sizeof(sess_id));
+        if (marsio_buff_get_metadata(mbuff, MR_BUFF_SESSION_ID, &sess_id, sizeof(sess_id)) <= 0)
+        {
+            PACKET_LOG_ERROR("failed to get session id");
+        }
     }
 
     return sess_id;
@@ -223,8 +235,13 @@ void packet_set_domain(struct packet *pkt, uint64_t domain)
     {
         marsio_buff_t *mbuff = (marsio_buff_t *)packet_get_io_ctx(pkt);
         assert(mbuff != NULL);
-        // TODO
-        // marsio_buff_set_metadata(mbuff, MR_BUFF_DOMAIN, &domain, sizeof(domain));
+// TODO
+#if 0
+        if (marsio_buff_set_metadata(mbuff, MR_BUFF_DOMAIN, &domain, sizeof(domain)) != 0)
+        {
+            PACKET_LOG_ERROR("failed to set domain");
+        }
+#endif
     }
 }
 
@@ -235,8 +252,13 @@ uint64_t packet_get_domain(const struct packet *pkt)
     {
         marsio_buff_t *mbuff = (marsio_buff_t *)packet_get_io_ctx(pkt);
         assert(mbuff != NULL);
-        // TODO
-        // marsio_buff_get_metadata(mbuff, MR_BUFF_DOMAIN, &domain, sizeof(domain));
+// TODO
+#if 0
+        if (marsio_buff_get_metadata(mbuff, MR_BUFF_DOMAIN, &domain, sizeof(domain)) <= 0)
+        {
+            PACKET_LOG_ERROR("failed to get domain");
+        }
+#endif
     }
 
     return domain;
@@ -248,7 +270,10 @@ void packet_set_route_ctx(struct packet *pkt, const char *route, int len)
     {
         marsio_buff_t *mbuff = (marsio_buff_t *)packet_get_io_ctx(pkt);
         assert(mbuff != NULL);
-        marsio_buff_set_metadata(mbuff, MR_BUFF_ROUTE_CTX, (void *)route, len);
+        if (marsio_buff_set_metadata(mbuff, MR_BUFF_ROUTE_CTX, (void *)route, len) != 0)
+        {
+            PACKET_LOG_ERROR("failed to set route ctx");
+        }
     }
 }
 
@@ -261,6 +286,10 @@ int packet_get_route_ctx(const struct packet *pkt, char *buff, int size)
         marsio_buff_t *mbuff = (marsio_buff_t *)packet_get_io_ctx(pkt);
         assert(mbuff != NULL);
         len = marsio_buff_get_metadata(mbuff, MR_BUFF_ROUTE_CTX, buff, size);
+        if (len <= 0)
+        {
+            PACKET_LOG_ERROR("failed to get route ctx");
+        }
     }
 
     return len;
@@ -272,7 +301,10 @@ void packet_set_sid_list(struct packet *pkt, uint16_t *sid, int num)
     {
         marsio_buff_t *mbuff = (marsio_buff_t *)packet_get_io_ctx(pkt);
         assert(mbuff != NULL);
-        marsio_buff_set_sid_list(mbuff, sid, num);
+        if (marsio_buff_set_sid_list(mbuff, sid, num) != 0)
+        {
+            PACKET_LOG_ERROR("failed to set sid list");
+        }
     }
 }
 
@@ -295,7 +327,10 @@ void packet_prepend_sid_list(struct packet *pkt, uint16_t *sid, int num)
     {
         marsio_buff_t *mbuff = (marsio_buff_t *)packet_get_io_ctx(pkt);
         assert(mbuff != NULL);
-        marsio_buff_prepend_sid_list(mbuff, sid, num);
+        if (marsio_buff_prepend_sid_list(mbuff, sid, num) != 0)
+        {
+            PACKET_LOG_ERROR("failed to prepend sid list");
+        }
     }
 }
 
@@ -305,6 +340,9 @@ void packet_append_sid_list(struct packet *pkt, uint16_t *sid, int num)
     {
         marsio_buff_t *mbuff = (marsio_buff_t *)packet_get_io_ctx(pkt);
         assert(mbuff != NULL);
-        marsio_buff_append_sid_list(mbuff, sid, num);
+        if (marsio_buff_append_sid_list(mbuff, sid, num) != 0)
+        {
+            PACKET_LOG_ERROR("failed to append sid list");
+        }
     }
 }