linux-kernel - [RFC/PATCH] Add preadv and pwritev system calls.

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Message-ID: <49419EA7.6050308@redhat.com>
Date:	Fri, 12 Dec 2008 00:13:43 +0100
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [RFC/PATCH] Add preadv and pwritev system calls.

  Hi,

The attached patch adds preadv and pwritev system calls.  These syscalls
are a pretty straightforward combination of pread and readv (same for
write).  They are quite useful for doing vectored I/O in threaded
applications.  Using lseek+readv instead opens race windows you'll have
to plug with locking.

Other systems have such system calls too, for example NetBSD, check
here: http://www.daemon-systems.org/man/preadv.2.html

The patch sports the actual system call implementation and the windup in
the x86 system call tables.  Other archs are TBD.

Comments?  Reviews?  Suggestions?  Flames?

cheers,
  Gerd

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