DOKK / manpages / debian 12 / systemtap-doc / function::user_string_n_warn.3stap.en
FUNCTION::USER_STRIN(3stap) String and data retrieving fun FUNCTION::USER_STRIN(3stap)

function::user_string_n_warn - Retrieves string from user space

1) user_string_n_warn:string(addr:long,n:long)

2) user_string_n_warn:string(addr:long,n:long,warn_msg:string)

addr

the user space address to retrieve the string from

n

the maximum length of the string (if not null terminated)

warn_msg

the warning message to return when data isn't available

1) 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.

2) Returns up to n characters of a C string from a given user space memory address. Reports the given warning message on the rare cases when userspace data is not accessible and warns (but does not abort) about the failure.

tapset::uconversions(3stap)

November 2022 SystemTap Tapset Reference