The include file is definitely a part of glibc (see /usr/include/execinfo.h).
/ David Hedbor
Previous text:
2003-02-13 09:36: Subject: Re: Weird problem with Image.SVG in Pike 7.4/7.5
I've never seen or used that call, but it sounds a lot more like a glibc function than a system call.
/ Niels Möller ()