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Filename : context-envvar.stp

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// 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 */ /* unmodified-fnargs */
    // 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';

%}