'\" t
.\"     Title: function::ustack
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: October 2018
.\"    Manual: Context Functions
.\"    Source: SystemTap Tapset Reference
.\"  Language: English
.\"
.TH "FUNCTION::USTACK" "3stap" "October 2018" "SystemTap Tapset Reference" "Context Functions"
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.SH "NAME"
function::ustack \- Return address at given depth of user stack backtrace
.SH "SYNOPSIS"
.sp
.nf
    ustack:long(n:long)
.fi
.SH "ARGUMENTS"
.PP
\fIn\fR
.RS 4
number of levels to descend in the stack\&.
.RE
.SH "DESCRIPTION"
.PP
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
\fBustack\fR
is called, or in what order\&.
.SH SEE ALSO\n 
.IR tapset::ucontext-symbols (3stap)