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what is a bus error?

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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