Ah, I had a hunch that it’s done that way. Thanks for hinting at it, I’ll try to reproduce that on OS X.
Thank you Robert. That made it pretty clear! > Am 08.05.2016 um 23:03 schrieb Robert Mustacchi <r...@joyent.com>: > > On 5/8/16 13:53 , Robert Lindstädt wrote: >> Hi, >> >> as a reference (and nicer rendering), I was asking this question on stack >> overflow but got pointed here. I would be very thankful for your help: >> http://stackoverflow.com/questions/37033240/dtrace-from-c-does-not-yield-same-profiling-result-compared-to-command-line >> >> <http://stackoverflow.com/questions/37033240/dtrace-from-c-does-not-yield-same-profiling-result-compared-to-command-line> >> >> >> I want to programmatically trace stacks from C for Node.js (JS addresses >> aside). >> >> The following command gives me stacks with resolved c++ symbols. >> >> sudo dtrace -C -n 'profile-101 /pid == 13221/ { ustack() }‘ >> >> The following C code however only returns addresses for Node's C/C++ code. >> What would be the equivalent? > > So, all the symbol resolution processing is always done in user land. In > other words, DTrace in the kernel only ever gathers addresses like > you're seeing for the cases where you're using ustack and not a ustack > handler via the jstack() action (jstack() also only returns symbols for > non-native frames). Note that if you want to see the JavaScript specific > symbols in addition to the native ones, you'll want to be using jstack() > in your examples and not ustack(). > > The way that these you can perform these mappings will change depending > on what system you're on. If you look at what DTrace does on illumos for > printing the results of ustack() > (http://src.illumos.org/source/xref/illumos-gate/usr/src/lib/libdtrace/common/dt_consume.c#1320), > then you'll see that it uses libproc and the Plookup_by_addr() function > to perform the translation. Though it's worth pointing out that neither > are stable interfaces, though they seldom change. > > Robert ------------------------------------------- dtrace-discuss Archives: https://www.listbox.com/member/archive/184261/=now RSS Feed: https://www.listbox.com/member/archive/rss/184261/25769126-e243886f Modify Your Subscription: https://www.listbox.com/member/?member_id=25769126&id_secret=25769126-8d47a7b2 Powered by Listbox: http://www.listbox.com
