[OpenAFS-devel] Re: Problem with IP address based ACL?

[Jeffrey Altman]

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Joe Buehler wrote:

> This is perilous for other reasons.  On AIX, for example, my recollection
> is that the first 8 parameters of a given type (float or int) are passed
> in registers -- and floats and ints go into different registers.  If there
> are floats involved the above method of doing varargs may fail badly because
> the registers will get all confused.
> 
> I would say that the faster this sort of thing gets removed, the better --
> it is based on ABI assumptions that are not valid for all machines.

We are well aware of the seriousness of the situation.  There are 374
calls to ubik_Call() in the code and that is a lot of surgery to perform.

Jim Rees wrote:
> I assume these are leftover from the days when not all platforms had
> varargs, and can be changed now to use varargs.  Unfortunately this is
> easier said than done.

Using varargs is not a desirable solution because it does not provide
for any additional compile time type safety.  There are two proposals
on the table at the moment.  One involves redefining ubik_Call() to
take a procedure specific data structure containing the procedure's
parameters.  The other involves getting rid of ubik_Call() entirely
by incorporating its functionality into the generated RPC client stubs.

Derrick Brashear is evaluating the feasibility of the two proposals.

Jeffrey Altman


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