Section: Context Functions (3stap)
Updated: March 2013
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function::ustack - Return address at given depth of user stack backtrace
number of levels to descend in the stack.
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
is called, or in what order.
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Time: 09:58:17 GMT, March 20, 2013