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Subjectsigaction SA_SIGINFO functionality

I can't get sigaction to work with SA_SIGINFO type of handler. I can see
that this is already in the kernel but does it work?

This is the program that doesn't work:

#include <stdio.h>
#include <asm/signal.h> /* ???! */
#include <setjmp.h>

jmp_buf main_loop;

void sigsegv_handler (int arg, struct siginfo *si, void *parg)
printf ("Signal SEGV! si = 0x%p\n", si);
longjmp (main_loop, 1);

main ()
char *f = NULL;
int retval;
struct sigaction sa;

sigaction (SIGSEGV, NULL, &sa);
sa.sa_sigaction = sigsegv_handler;
sa.sa_flags = SA_SIGINFO;
sigemptyset (&sa.sa_mask);
retval = sigaction (SIGSEGV, &sa, NULL);
if (retval < 0)
exit (10);

printf ("Entering the loop\n");

if (setjmp (main_loop))
printf ("Back at main_loop\n");
*f = 0;

return 0;

This results in the following output:
Signal SEGV! si = 0x(nil)
Back at main_loop
Signal SEGV! si = 0x(nil)
Back at main_loop

So, the si parameter (as well as parg) is NULL. The kernel didn't realize
that I have a siginfo type of handler, did it?

Is it something with the program or the kernel?

Thanks in advance,
| Josip Gracin
| Zagreb, Croatia

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