On 7/24/19 5:16 , ngadre via dtrace-discuss wrote:
> Hi,
>
> I come from Linux background, and currently working on Dtrace on FreeBSD.
> Having worked on SystemTap on Linux, I worked with para-callgraph.stp a lot
> to trace user-space function calls, of user defined functions to understand
> new utilities.
>
> Is there a utility like para-callgraph.stp available in dtrace. If not, is it
> feasible to create one (provided there are constructs available).
>
> #!/usr/bin/stap
>
> function trace(entry_p, extra) {
> %( $# > 1 %? if (tid() in trace) %)
> printf("%s%s%s %s\n",
> thread_indent (entry_p),
> (entry_p>0?"->":"<-"),
> ppfunc (),
> extra)
> }
>
>
> %( $# > 1 %?
> global trace
> probe $2.call {
> trace[tid()] = 1
> }
> probe $2.return {
> delete trace[tid()]
> }
> %)
>
> probe $1.call { trace(1, $$parms) }
> probe $1.return { trace(-1, $$return) }
>
> I was trying to rewrite this for dtrace, dtrace understands conditional
> compilation as well. So will this work for tracing call-graphs of user space
> programs if written as a dtrace script.
The dtrace -F option (flowindent) I believe does the indenting that you
want. And the pid provider allows you to specify aribtrary parts of
userland. So, I believe that something like is a pretty close approximation:
dtrace -F -n 'pid$target:a.out::entry,pid$target:a.out::return' -c /bin/ls
You'll have to modify it for various parts of functions and libraries
you want and pick a number of explicit parameters.
Robert
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