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// context-envvar tapset
// Copyright (C) 2010 Pixar Inc. and/or Lars R. Damerow
//
// 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.
// <tapsetdescription>
// Context functions provide additional information about where an event occurred. These functions can
//provide information such as a backtrace to where the event occurred and the current register values for the
//processor.
// </tapsetdescription>
/**
* sfunction env_var - Fetch environment variable from current process
* @name: Name of the environment variable to fetch
*
* Description: Returns the contents of the specified environment value
* for the current process. If the variable isn't set an empty string
* is returned.
*/
function env_var:string(name:string)
{
if (name == "")
return ""
env_value = "";
mm = @task(task_current())->mm;
if (mm)
{
env_start = @mm(mm)->env_start;
env_end = @mm(mm)->env_end;
if (env_start != 0 && env_end != 0)
{
len = env_end - env_start;
cur = user_string(env_start, "");
env_name = tokenize(cur, "=");
while (env_name != name && len > 0)
{
env_len = strlen(cur);
env_start += env_len + 1;
len -= env_len + 1;
if (len > 0)
{
cur = user_string(env_start, "");
env_name = tokenize(cur, "=");
}
else
env_name = "";
}
if (len > 0)
env_value = tokenize("", "");
}
}
return env_value;
}
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