4.2. Accessing User-Space Target Variables
User-space target variables can be accessed in the same manner as described in
Section 3.3.2, “Target Variables”. However, in Linux there are separate address spaces for the user and kernel code. When using "->" operator SystemTap will access the appropriate address space. For pointers to base types such as integers and strings there are a number of functions listed below to access user-space data. The first argument for each functions is the pointer to the data item.