using off_t in talloc

[Love Hörnquist Åstrand]

"Stefan (metze) Metzmacher" <metze at samba.org> writes:

> Hi *,
>
> I thought about removing off_t from talloc,
> it's used as return value of talloc_total_size() and
> talloc_total_blocks().
>
> I have added some configure checks
> to the standalone build of talloc.
> And it seems that:
>
> sizeof(off_t) is 8 (only Stratos has 4)
> sizeof(size_t) is 4 on x86 and 8 on 64bit platforms
>
> Are there any platforms where the total RAM-size per
> process doesn't fit into size_t?

short answer: no.

size_t is the type returned by sizeof operator. c99 defines MAX_SIZE (that
is the maximum value of size_t) to be 65535, or greater.

That said, you should look at mmap for a clue how its used. size_t for
memory sizes, off_t is for disk offsets, so depending on what you want to
return, memory offset or disk offset you have to choose from size_t or
off_t.

http://www.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_12.html
contains defintions for both types.

Love

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