Re: number of eth0 device

[Coywolf Qi Hunt <qiyong@fc-cn.com>]

On Wed, Oct 19, 2005 at 01:23:48PM +0200, Mathieu Segaud wrote:
> Erik Mouw <erik@harddisk-recovery.com> disait dernièrement que :
> 
> > On Wed, Oct 19, 2005 at 12:31:35PM +0200, Karel Kulhavy wrote:
> >> I am looking into Documentation/devices.txt in 2.4.25 and eth0 is not listed
> >> there. If I grep "eth", I get only
> >> 
> >> 38 char        Myricom PCI Myrinet board
> >> [...]
> >> "This device is used for status query, board control and "user level
> >> packet I/O."  This board is also accessible as a standard networking
> >> "eth" device.  "
> >> 
> >> and then
> >> 
> >> /dev/pethr0
> >> 
> >> Is eth0 some kind of special device that doesn't have any number
> >> assigned?
> >
> > Yes, there's no such thing as /dev/eth0, network interfaces have their
> > own namespace. Linux uses the defacto standard BSD socket interface for
> > networking, so blame the BSD people for violating the "everything is a
> > file" rule.
> 
> well, the way NIC's behave kind of forbids this
> taken from Linux Device Drivers, 3rd Edition, page 497
> "The normal file operations (read, write, and so on) do not make sense
> when applied to network interfaces, so it is not possible to apply the
> Unix ''everything is a file'' approach to them"   

I think there're other nodes in /dev on which normal file
operations do not make sense either.
-- 
Coywolf
-
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/