From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: root@chaos.analogic.com
Cc: "Srinivas G." <srinivasg@esntechnologies.co.in>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Having problem with mmap system call!!!
Date: Thu, 16 Sep 2004 14:31:36 +0100 [thread overview]
Message-ID: <1095341494.22744.26.camel@localhost.localdomain> (raw)
In-Reply-To: <Pine.LNX.4.53.0409160958070.12146@chaos>
On Iau, 2004-09-16 at 15:07, Richard B. Johnson wrote:
> if((vp = mmap((caddr_t) HINT, len, PROT, FLAGS, fd, addr)) == SHM_FAIL)
> {
> fprintf(stderr, "Can't access shared memory\n");
> exit(EXIT_FAILURE);
SHM_FAIL is the wrong error check btw.
It is much better to do this in the driver than do nasty user mode hacks
using /dev/mem. When you do it kernel driver side you end up with a
cleaner mmap interface, a sensible permissions model and the hardware
device pages mapped directly and nicely into the app
next prev parent reply other threads:[~2004-09-16 14:40 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4EE0CBA31942E547B99B3D4BFAB348111078FE@mail.esn.co.in>
2004-09-16 14:07 ` Having problem with mmap system call!!! Richard B. Johnson
2004-09-16 13:31 ` Alan Cox [this message]
2004-09-16 14:54 ` Richard B. Johnson
2004-09-16 15:57 ` Alan Cox
2004-09-16 18:13 ` Richard B. Johnson
2004-09-16 20:01 ` Alan Cox
2004-09-16 14:42 Srinivas G.
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1095341494.22744.26.camel@localhost.localdomain \
--to=alan@lxorguk.ukuu.org.uk \
--cc=linux-kernel@vger.kernel.org \
--cc=root@chaos.analogic.com \
--cc=srinivasg@esntechnologies.co.in \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.