Provided by: systemtap-doc_2.3-1ubuntu1.4_all 

NAME
tapset::context-envvar - systemtap context-envvar tapset
DESCRIPTION
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.
env_var
Fetch environment variable from current process
See function::env_var(3stap)
for details.
SEE ALSO
function::env_var(3stap), stap(1), stapprobes(3stap)
IBM --- tapset::context-envvar(3stap)