Re: [PATCH v2] Add preadv and pwritev system calls.

Scott Lurndal
2008-12-12T18:44:40Z

On Fri, Dec 12, 2008 at 05:02:05PM +0100, Gerd Hoffmann wrote:
> Matthew Wilcox wrote:
> > On the other hand, NetBSD have approximately 0% market share.
> > We shouldn't let them lock us into making a bad decision. Is there
> > anyone other than NetBSD who has added these syscalls?
>
> Free- and OpenBSD have it too. For Solaris I've found a feature request
> only. Dunno about MacOS/Darwin. Other un*xes which are important these
> days?
>
> I'd *really* hate it to have the same system call with different
> argument ordering on different systems though. Especially when swapping
> two integer values, so gcc wouldn't error out on wrong usage.

I would suggest that from the end-users perspective, the user-mode API
should be similar to pread/pwrite, e.g:

int preadv(fd, iovec, iovec_size, offset)

scott