When should I use tt_free?

libtt maintains an internal storage stack from which you receive data buffers. When you call a ToolTalk API routine, any char * or void * returned points to a copy that you are responsible for freeing.

Use the mark and release functions to free allocated buffers during a sequence of operations. However, the release call frees everything allocated since the corresponding mark call. If you want to store certain data that was returned by the ToolTalk service, make a copy of the data before you do any operations that may free it.