Re: Is there a (somewhat) portable way to get the return address of a function?

[Nick Ing-Simmons <nik at tiuk dot ti dot com>]

George T . Talbot <george@moberg.com> writes:
>I'm working on some library code in Linux, and, for debugging purposes, I'd
>like to be able to call dlinfo() on the return address of a function in my
>library so that I can track usage of the function:
>
>#define	magic()		...woudln't I like to know...
>
>void	some_library_function(void)
>{
>	void*	return_address = magic();
>	Dl_info	info;
>
>	if (dlinfo(return_address, &info))
>		fprintf(some_log_file, "some_library_function() called from %s in executable
>%s.\n",
>			info.dli_sname, info.dli_fname);
>	else
>		fprintf(some_log_file, "some_library_function() called from unknown
>caller.\n");
>}
>
>-----
>void	some_code(void)
>{
>	...
>	some_library_function();
>	...
>}
>
>
>In other words, I want magic() above to return the address in some_code()
>where some_library_function() was called.

Sure: 
void	some_library_function(void)
{
       void*	return_address = __builtin_return_address(1);
       DL_info info;
       if (dladdr(return_address,&info))
        {
        }
 ...
}

Note that is dladdr() not dlinfo().

Works at least on Linux and Solaris. 


-- 
Nick Ing-Simmons <nik@tiuk.ti.com>
Via, but not speaking for: Texas Instruments Ltd.