Path: utzoo!utgpu!news-server.csri.toronto.edu!me!writer
Newsgroups: comp.lang.c
From: writer@me.utoronto.ca (Tim Writer)
Subject: How do I get the address of the current function?
Message-ID: <90Jun28.195353edt.19442@me.utoronto.ca>
Organization: University of Toronto, Department of Mechanical Engineering
Date: 28 Jun 90 23:54:03 GMT

This is a question that has puzzled me for some time.  It may be more
appropriate in comp.unix.wizards but I thought I'd try my luck here first.

Is there a way to get the address of the function which is currently
executing?  For example:

char	*fcn;

void
foo()
{
	...

	fcn=current_function();

	... do something with fcn
}

You may ask why?  Or why not just "fcn=(char *) foo"?  I am using setjmp()
and longjmp() to do some error handling.  When I use longjmp() it may jump
out of the current function or it may not.  Sometimes I want to jump back
to where I used longjmp().  I do this with another setjmp(), longjmp() pair.
However,  I can only do the second longjmp() if the first remained within
the current function.  In short, I am trying to discern if a longjmp()
would jump into a function that has already returned.  I thought that a
function like current_function() would be helpful.

On some systems, if longjmp() encounters a problem, it calls a user
definable function, longjmperror().  Mine doesn't.

If someone has a solution to this longjmp() problem which doesn't involve
something like current_function(), I'd be happy to hear from you.  But, I'd
still like to know if it is possible to do something like
current_function().

Thanks in advance.

Tim

P.S I'm using a sparcStation running Sun 4.0.