'\" t
.\"     Title: function::ucallers
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: November 2020
.\"    Manual: Context Functions
.\"    Source: SystemTap Tapset Reference
.\"  Language: English
.\"
.TH "FUNCTION::UCALLERS" "3stap" "November 2020" "SystemTap Tapset Reference" "Context Functions"
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.SH "NAME"
function::ucallers \- Return first n elements of user stack backtrace
.SH "SYNOPSIS"
.sp
.nf
    ucallers:string(n:long)
.fi
.SH "ARGUMENTS"
.PP
\fIn\fR
.RS 4
number of levels to descend in the stack (not counting the top level)\&. If n is \-1, print the entire stack\&.
.RE
.SH "DESCRIPTION"
.PP
This function returns a string of the first n hex addresses from the backtrace of the user stack\&. Output may be truncated as per maximum string length (MAXSTRINGLEN)\&.
.SH "NOTE"
.PP
To get (full) backtraces for user space applications and shared shared libraries not mentioned in the current script run stap with \-d /path/to/exe\-or\-so and/or add \-\-ldd to load all needed unwind data\&.
.SH SEE ALSO\n 
.IR tapset::ucontext (3stap)