Looking at the kernel code, it appears that Linux
uses SIGBUS only in couple of extreme (or weird??)
cases: no page available when handling a page fault,
segment not present. AFAIK, these aren't the original
intended uses of this signal.
Since this signal reports a kernel problem rather than
a userland error, it would be hard to simulate from a
program.
-Ravi.
--- Peter Jay Salzman <p@dirac.org> wrote:
> we all know what a segfault is.
>
> however, what exactly is a "bus error"? can somone
> show me a "hello
> world" type program that barfs with a SIGBUS?
> something like:
>
> char *p; /* p is a pointer to a
> char */
> p = (char *) rand(); /* now p points to la-la
> land */
> printf("\%c", *p); /* whammo: a segfault! */
>
> but which produces a bus error...
>
> pete
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