function::ns_sid - Returns the session ID of the current process as seen in a pid namespace

       None

       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.

       function::ns_sid - Returns the session ID of the current process as seen in a pid namespace

tapset::context(3stap)

SystemTap Tapset Reference                         April 2024                            FUNCTION::NS_SID(3stap)

           ns_sid:long()