[Bug tapsets/23738] c++ string access tapset

[wcohen at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23738

--- Comment #1 from William Cohen <wcohen at redhat dot com> ---
There are differences between f28 and rhel7, so needed something like the
following on rhel7 for the code to work.

  // Dig through C++ string private fields to find the systemtap script name
  cmdline_script = @cast(session, "struct
systemtap_session")->cmdline_script->_M_dataplus->_M_p
  if (strlen(user_string2(cmdline_script, "<unavailable>"))){
    script = "<cmdline_script>"
  } else {
    script_file = @cast(session, "struct
systemtap_session")->script_file->_M_dataplus->_M_p
    script = user_string2(script_file, "<unavailable>")
  }

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