On Mon, Jun 11, 2007 at 10:39:56PM +0300, Eduard-Gabriel Munteanu wrote:
> No offense, but this is an ugly hack.
I'm not going to defend it too much, but the alternatives don't seem any
better to me.
> What if sizeof(int) != sizeof(long)?
Doesn't matter - the casting will preserve the value. Of greater
concern is the relationship between sizeof(void *) and sizeof(long).
That's not guaranteed by the standard, but is by gcc.
> You're calling glibc functions
> with that fd as a parameter. On some arches, compiling will issue
> warnings or simply fail.
Which ones?
> An alternative would be to use kmalloc instead of a global static
> variable. Do you like this one more?
No, that trades the global variable for a new point of failure.
The main reason I like the current casting better than your global
(not by a lot) is that globals have to be audited for SMP safety. So,
I don't want any globals which don't need to be. This implies a
local, and to minimize the machinery associated with that (kmalloc, or
passing a pointer and synchronizing to avoid returning too soon), just
passing the descriptor in the pointer and accepting the casting needed
to get it through the compiler.
Jeff
--
Work email - jdike at linux dot intel dot com
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