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Message-ID: <012501c11f40$1b082090$0a02a8c0@acceleron>
From: "Andrew Cottrell" <acottrel AT ihug DOT com DOT au>
To: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>,
        "Charles Sandmann" <sandmann AT clio DOT rice DOT edu>
Cc: <djgpp-workers AT delorie DOT com>
Subject: Fw: Windows 2000 /dev/null permission query
Date: Tue, 7 Aug 2001 21:54:15 +1000
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Reply-To: djgpp-workers AT delorie DOT com

Email problems. I have to send this again. Sorry if people get multiple
copies.

> > Alternatively, we could use function 7143h to set file times directly,
> > without opening it.  Since this function is reported to sometimes fail
> > on Windows 98 and ME, we should use this alternative only on W2K/XP
> > (detectable by their DOS version, 5.50, together with LFN support).
> > Assuming that 7143h doesn't have any surprised (a bold assumption, I
> > know ;-), this would completely avoid the problem with LFN vs non-LFN
> > handles.
> Function 7143 works on my Win2K box, but due to buggy Win 9x
implementation
> this does not work on Win98.
>
> Previous info on 7143 issue:
> Done some digging at Bill's home and only found the following interesting
> page on Interrupt 21 function 7143 sub-functions 5 and 7 issue with Win
> 98/98SE/ME:
> http://support.microsoft.com/support/kb/articles/Q277/6/28.ASP
>
> Output of testing:
> -rw-r--r--   1 AC       root            4 Aug 24  2001 new.txt
>
> 5700 call time cx = 0xB733 date dx = 0x2B18 r.x.flags = 0x0002 r.x.ax =
> 0x5700
> 7143 call time cx = 0xB734 date di = 0x2B18 r.x.flags = 0x0002 r.x.ax =
> 0x7143
> Creation time 10 milliseconds (si)= 0x00BC
> NEW date (di)= 0x2B19
> 7143 07 call time cx = 0xB734 date di = 0x2B19 r.x.flags = 0x0002 r.x.ax =
> 0x7143
> Creation time 10 milliseconds (si)= 0x00BC
> 7143 03 call time cx = 0xB734 date di = 0x2B19 r.x.flags = 0x0002 r.x.ax =
> 0x7143
> Creation time 10 milliseconds (si)= 0x00BC
>
> -rw-r--r--   1 AC       root            4 Aug 25  2001 new.txt
>
> One advantage of this is that it would be probably quicker on NT as it one
> interrupt call and does not require any file handlers etc....
>
> Now for the hard question:
>     Which way should we go to fix utime?
>             Use 7143 or use SFN handles? My gut feel is to use the 7143
> function on Win2K where LFN is set.
>
> Not being up to date with NT 4.0 support and the LFN drivers/services what
> would occur on NT 4.0? Should LFN bet set or not set?
> No flames please on the next question as I don't like asking, but it would
> make the change easier to implement: Does NT 4.0 LFN support matter?
>
> Now to have a look at 71A6h support. Got 30 mins before a series final on
> TV.
>
> Andrew