lkml.org 
[lkml]   [2001]   [May]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] adding PCI bus information to SCSI layer
On Tue, May 01, 2001 at 09:32:41PM +0100, Alan Cox wrote:
> Having thought over the issues I plan to maintain a 32bit dev_t kernel with
> conventional mknod behaviour, even if Linus won't. One very interesting item
> that Peter Anvin noted is that its not clear in POSIX that
>
> mknod /dev/ttyF00 c 100 100
>
> open("/dev/ttyF00/speed=9600,clocal");
>
> is illegal. That may be a nice way to get much of the desired
> behaviour without totally breaking compatibility

Ouch!

How is that supposed to work with the dcache?

1. Does POSIX state, that "/" is the directory/entry[1] separator?
2. Can a device node be an directory?

If 1. and not 2., there is no way to implement it like that.

I don't know how people call this, if they call sth. like DevFS
"crappy", but I would be very surprised, if they call it "clean".

Just think of:

test -r /dev/ttyF00/speed=9600,clocal && cat /dev/ttyF00/speed=9600,clocal

Or the equivalent in C in most of the programs, which read sth.

POSIX might not forbid this, because common sense already does ;-)

Regards

Ingo Oeser

[1] entry := directory | file
--
10.+11.03.2001 - 3. Chemnitzer LinuxTag <http://www.tu-chemnitz.de/linux/tag>
<<<<<<<<<<<< been there and had much fun >>>>>>>>>>>>
-
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/

\
 
 \ /
  Last update: 2005-03-22 12:52    [W:0.053 / U:1.464 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site