Re: alignment

[Jun-ichiro itojun Hagino <itojun () iijlab net>]

> > > changes the layout of the structure, so you'd have to add padding to
> > > structures that lack it.
> >      if they don't have padding, they do not work right even now.
> I.e., a structure
>       struct foo {
>               u_int32_t       a;
>               u_int8_t        b;
>               u_int32_t       c;
>       };
> won't work as a packet format description - you have to use
>       struct foo {
>               u_int32_t       a;
>               u_int8_t        b;
>               u_int8_t        pad[3];
>               u_int32_t       c;
>       };
> ?  If so, are there any structures of the sort that won't work?

        i mean, if there's any structure decl which depends on automatic
        padding now, the struct definition will be interpreted differently
        on 64bit and 32bit arch (= doesn't work correctly).

itojun
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