Re: bytegroesse, was endianess/Re: audio-cd

Christian Weisgerber <naddy(at)mips.inka.de> wrote:
> Oliver Fromme <de-bsd-questions(at)DE.FreeBSD.ORG> wrote:
> > und starte mal folgendes C-Programm auf 'ner Alpha:
> >
> > int main() {
> > char c; int *p;
> > p = (int *) &c + 1;
> > return *p;
> > }
> >
> > Das fliegt Dir um die Ohren,
>
> Nein.

Sorry, Du hast recht, da ist mir einfach ein Klammernpaar
abhanden gekommen ... Jetzt aber:

$ uname -m
alpha
$ sysctl -a | grep unaligned
machdep.unaligned_print: 1
machdep.unaligned_fix: 0
machdep.unaligned_sigbus: 1
$ cat foo.c
int main() {
        char c; int *p;
        p = (int *) (&c + 1);
        return *p;
}
$ cc -Wall -ansi -pedantic -g -o foo foo.c
$ ./foo
pid 1642 (foo): unaligned access: va=0x11ffb471 pc=0x1200007a0 ra=0x120000698 op=ldl
zsh: 1642 bus error (core dumped) ./foo
$ gdb foo foo.core
[...]
Program terminated with signal 10, Bus error.
#0 0x1200007a0 in main () at foo.c:4
4 return *p;

Gruß
   Olli

-- 
Oliver Fromme, secnetix GmbH & Co KG, Oettingenstr. 2, 80538 München
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