Re: 2.2.17pre15 and SA_SIGINFO

From: Miquel van Smoorenburg (
Date: Wed Aug 02 2000 - 04:45:08 EST

In article >>,
H. Peter Anvin <> wrote:
>I have a program which relies on being able to derive the address of
>a SIGSEGV. To do that, I use the SA_SIGINFO option to sigaction() and
>read out the faulting address from the si_addr parameter of the siginfo
>structure (second argument.) I also check si_code for SEGV_ACCERR.
>Under 2.4 kernels, this works great. However, under 2.2.17pre15 (I
>downgraded because of stability problems) and glibc 2.1.2, si_code
>and si_addr are both 0. Is this simply unimplemented in 2.2 kernels,
>or is this a bug?

Well, I can't help you with that, but I know of an alternative for
i386 at least:

#include <signal.h>

void segv_handler(int sig, struct sigcontext ctx)
        void *addr = (void *)ctx.eip;



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