It's not my problem as jhb has volunteered to fix all these.
we just add an entry point for bcopy_volatile()
next to that for bcopy.
(I called it vbcopy in my suggestion.)
bzero has the same thing
bzero_volatile() I guess.
Though I still feel that it breaks POLA to not be able to use
bcopy and bzero.
On Wed, 27 Feb 2002, Garance A Drosihn wrote:
> At 1:27 PM -0800 2/27/02, Julian Elischer wrote:
> >There are saveral places (e.g. if_ie.c) where data
> >is copied out of a buffer that is shared with the hardware.
> >The pointer to this is correctly labelled as "volatile", though
> >at the time we will copy the data out we know it to be stable.
> Note: "at the time we will copy the data ... we know"
> >A while ago I proposed the following patch:
> > * Note: the "volatile" below does not REQUIRE that the argument be
> > * volatile, but rather ony says that it is OK to use a volatile * i
> > * there. Same for the const. I know a const volatile sounds strange
> > * but it only indicates that either is acceptable.
> > */
> >void bcopy __P((volatile const void *from, volatile void *to,
> > size_t len));
> This will always allow bcopy to do the copy to or from any volatile
> location, even if the call is done at a bad time. Any programmer
> calling bcopy should at least get a little flag waved at them if
> they are working with volatile arguments.
> How philosophically sickening would it be to create a macro:
> #define bcopy_volatile(x,y) bcopy((casts)x,(casts)y)
> so that you can have cleaner-looking source code, but still have
> it so the programmer has to *explicitly* say "Yes, I know I am
> dealing with volatile memory here".
> Garance Alistair Drosehn = [EMAIL PROTECTED]
> Senior Systems Programmer or [EMAIL PROTECTED]
> Rensselaer Polytechnic Institute or [EMAIL PROTECTED]
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