Very Computer

I have written a program, which is very complicated
and so it happens quite often, that it has to exit itself,
because its handling an invalid index of an array.
(It never crashes, it always nicely exits).
Nevertheless - in that case, It would be very nice
if my program could display the function hierarchy,
how my program reached that exit.
I have already seen programs doing that, before they crashed.
How can I do this on a unix/linux system ?
Are there special functions to read the symbols contained within the ELF
File ?

rds

Quote:

> Nevertheless - in that case, It would be very nice
> if my program could display the function hierarchy,
> how my program reached that exit.

- Perform a backtrace, that is, trace the calling execution path
- Determine which files are where in memory
- Use the file symbol information to convert to the addresses in the
execution path into symbol names

You can do this manually (which is interesting work, but kind of a pain) or
use the glibc support functions (since you mention you're on linux). Take a
look at
http://elvin.dstc.com/ListArchive/elvin-dev/archive/2001/10/msg00077.....

Cheers,
Shaun

Quote:> Nevertheless - in that case, It would be very nice
> if my program could display the function hierarchy,
> how my program reached that exit.

This tiny module allows you to trace your function
calls and print the stack as the program is running.
It only works with gcc, but on most Unixes though.

Hope it helps
--
Nicolas