centos man page for function::ustack

FUNCTION::USTACK(3stap) 					 Context Functions					   FUNCTION::USTACK(3stap)

NAME
       function::ustack - Return address at given depth of user stack backtrace

SYNOPSIS
	   ustack:long(n:long)

ARGUMENTS
       n
	   number of levels to descend in the stack.

DESCRIPTION
       Performs a simple (user space) backtrace, and returns the element at the specified position. The results of the backtrace itself are
       cached, so that the backtrace computation is performed at most once no matter how many times ustack is called, or in what order.

SystemTap Tapset Reference					     June 2014						   FUNCTION::USTACK(3stap)