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

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Message-ID: <20081214181943.GB1440@ucw.cz>
Date:	Sun, 14 Dec 2008 19:19:43 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Gerd Hoffmann <kraxel@...hat.com>
Cc:	Scott Lurndal <scott.lurndal@...afsystems.com>,
	Matthew Wilcox <matthew@....cx>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, Ulrich Drepper <drepper@...hat.com>
Subject: Re: [PATCH v2] Add preadv and pwritev system calls.

On Fri 2008-12-12 20:56:00, Gerd Hoffmann wrote:
> Russell King wrote:
> >> should be similar to pread/pwrite, e.g:
> >>
> >>     int preadv(fd, iovec, iovec_size, offset)
> > 
> > Yes, and that's easy for glibc to achieve.
> 
> This hints the ABI problem exists at syscall level only.  Is that
> correct?  So we can have
> 
> 	preadv(fd, vec, vlen, off)
> 
> argument ordering at app <-> glibc level and
> 
> 	preadv(fd, vec, off, vlen)
> 
> ordering at glibc <-> kernel (aka syscall) level and it works fine for
> ARM + MIPS + PARISC?

ltrace and strace would show different values; very misleading :-(.

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