modbus_set_slave error handling

v-zhuravlev · Sep 24, 2018 · 5f55508 · 5f55508
1 parent 7dd939a
commit 5f55508
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/src/modbus.c b/src/modbus.c
@@ -212,7 +212,12 @@ int zbx_modbus_read_registers(AGENT_REQUEST *request, AGENT_RESULT *result)
 		modbus_free(ctx);
 		return SYSINFO_RET_FAIL;
 	}
-	modbus_set_slave(ctx, slave_id);
+	if (modbus_set_slave(ctx, slave_id) == -1)
+	{
+		SET_MSG_RESULT(result, strdup(modbus_strerror(errno)));
+		modbus_free(ctx);
+		return SYSINFO_RET_FAIL;
+	}
 
 	//<reg> set register to start from
 	errno = 0;