function::returnstr - Formats the return value as a string

format
           Variable to determine return type base value

       This function is used by the nd_syscall tapset, and returns a string. Set format equal to 1 for a
       decimal, 2 for hex, 3 for octal.

       Note that this function should only be used in dwarfless probes (i.e. 'kprobe.function(“foo”)'). Other
       probes should use return_str.

       function::returnstr - Formats the return value as a string

tapset::errno(3stap)

SystemTap Tapset Reference                         April 2024                         FUNCTION::RETURNSTR(3stap)

           returnstr:string(format:long)