Date: Tue, 27 Feb 2001 20:18:47 -0800 From: Julian Elischer <julian@elischer.org> To: Kostas Magoutis <magoutis@eecs.harvard.edu> Cc: freebsd-arch@freebsd.org Subject: Re: Logical device instances Message-ID: <3A9C7C27.D29A06A1@elischer.org> References: <200102280048.f1S0m9n09106@wally.eecs.harvard.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
Kostas Magoutis wrote:
>
> I am writing a device driver for a user-level networking card. User
> level code interacts with it via open, close, mmap, and ioctl. A
> separate logical instance of the device needs to be created each time
> a process opens the device (as in when a file is created when a vnode
> is opened). The device driver needs to have a way to find out on what
> logical instance of the device a system call is performed. It seems
> to me that at present (with either specfs or devfs), the device driver
> has no way to find out on what opened instance of the device an
> operation is performed. Am I missing something or the present device
> driver interfaces just don't support such functionality?
> Thanks,
>
> Kostas
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-arch" in the body of the message
device drivers for networking don't use the
open/close/read/write interface.
they use sockets, so that different processs open differnt sockets
which are multiplexed onto the device using a protocol.
--
__--_|\ Julian Elischer
/ \ julian@elischer.org
( OZ ) World tour 2000-2001
---> X_.---._/
v
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-arch" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3A9C7C27.D29A06A1>