Provided by: systemtap-doc_2.9-2ubuntu2_all 

NAME
function::ns_sid - Returns the session ID of the current process as seen in a pid namespace
SYNOPSIS
ns_sid:long()
ARGUMENTS
None
DESCRIPTION
The namespace-aware session ID of a process is the process group ID of the session leader as seen in the
target pid namespace if provided, or the stap process namespace. Session ID is stored in the
signal_struct since Kernel 2.6.0.
SEE ALSO
tapset::context(3stap)
SystemTap Tapset Reference April 2016 FUNCTION::NS_SID(3stap)