cxa_throw_replace_backtrace.c

#include <stdio.h>
#include <dlfcn.h>
#include <execinfo.h>

typedef void (*cxa_throw_type)(void *, void *, void (*) (void *));
cxa_throw_type orig_cxa_throw = 0;

void load_orig_throw_code()
{
    orig_cxa_throw = (cxa_throw_type) dlsym(RTLD_NEXT, "__cxa_throw");
}

#ifdef __cplusplus
extern "C" {
#endif

void __cxa_throw (void *thrown_exception, void *pvtinfo, void (*dest)(void *)) {
    printf(" ################ DETECT A THROWN !!!!! #############\n");
    if (orig_cxa_throw == 0)
        load_orig_throw_code();

    {
        static int throw_count = 0;
        void *array[10];
        int size;

        size = backtrace(array, 10);
        fprintf(stderr, "#### EXCEPTION THROWN (#%d) ####\n", ++throw_count);
        backtrace_symbols_fd(array, size, 2); // 2 == stderr
    }

    orig_cxa_throw(thrown_exception, pvtinfo, dest);
}

#ifdef __cplusplus
}
#endif