Re: Help using elfutils to get function and line number

Hi -

I am trying to implement a library which substitutes libc (using LD_PRELOAD), in order to be able to inject errors into programs under test making standard library calls (e.g. fopen, malloc, etc.). I would like to log the backtrace when such a call is made, to see the execution path which lead to the error. [...]

(We're not quite there yet, but this sort of thing will be pretty easy to express with systemtap, as in ...)

# inject a fault probe process("/lib/libc.so.6").function("fread_unlocked").return { $fp->_flags |= 4 } # print the backtrace probe process("/lib/libc.so.6").function("fclose") { print_backtrace() }

- FChE