Provided by: systemtap-doc_1.6-1ubuntu1_all
function::user_string_n_warn - Retrieves string from user space
addr the user space address to retrieve the string from n the maximum length of the string (if not null terminated)
Returns up to n characters of a C string from a given user space memory address. Reports “<unknown>” on the rare cases when userspace data is not accessible and warns (but does not abort) about the failure.