regarding the handling of resource type data in PHP extensions

Hi All, I am involved in writing a mapper extension wherein I take a api of mysql extension like mysql_connect() and map it to db2_connect() and then connect to the database and return the connection handle to the script(.php file). The *problem involved* is with the *resource types*. In the connection handle structure of my extension there is a field which is the *pointer* to the *db2 connection handle*(conn_handle *connection).After I establish the connection to the database and then use the *connection handle* to *close* the connection to the database, I face problems.In the connection handle of my extension I have fileds like database,username,password etc which I am able to *access properly* but when I try to access the *db2 connection handle* fields through the *pointer*present in my connection handle structure (conn_handle *connection) I get segmentation fault. Is it that the an extension cannot return values(a resource type in my case) to another extension. Please do suggest what wrong I am doing. With Regards, Harsha