/usr/share/systemtap/tapset/dyninst/context-envvar.stp is in systemtap-common 2.3-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | // context-envvar tapset
// Copyright (C) 2012 Red Hat, Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
// NB: functionally equivalent to linux/context-envvar.stp
%{
#include <stdlib.h>
%}
function env_var:string(name:string)
%{ /* pure */
// XXX getenv may not be reentrant!
const char* env = getenv(STAP_ARG_name);
if (env)
strlcpy (STAP_RETVALUE, env, MAXSTRINGLEN);
else
STAP_RETVALUE[0] = '\0';
%}
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