X-Spam-Check-By: sourceware.org
To: cygwin AT cygwin DOT com
From: =?ISO-8859-1?Q?Ren=E9_Berber?= <r DOT berber AT computer DOT org>
Subject:  Re: C exe redirection blank file
Date:  Sat, 06 May 2006 15:49:09 -0500
Lines: 98
Message-ID: <e3j244$4hm$1@sea.gmane.org>
References:  <4e225417b8AndyBurgess AT argonet DOT co DOT uk> <e3g084$921$1 AT sea DOT gmane DOT org> <4e2269bfcfAndy AT jet-net DOT co DOT uk> <e3gi0p$23s$1 AT sea DOT gmane DOT org> <4e22e3825fAndy AT jet-net DOT co DOT uk>
Mime-Version:  1.0
Content-Type:  text/plain; charset=ISO-8859-1
Content-Transfer-Encoding:  quoted-printable
User-Agent: Thunderbird 1.5.0.2 (Windows/20060308)
In-Reply-To: <4e22e3825fAndy@jet-net.co.uk>
OpenPGP: url=hkp://random.sks.keyserver.penguin.de
X-IsSubscribed: yes
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

Andy AT Jet-Net wrote:

[snip]
> Is there any way of checking which particular Windows.dll it could be
> needing?

cygcheck <program>

will list the dynamic libraries used.

> Could there be any serial port setting that may be affecting it?

I don't see how.

> Incidentally I'm run a one minute cron job (for the working process) - wo=
uld
> that affect anything?

Could be, if the process runs more than once concurrently and tries to acce=
ss
the same file.  It certainly will try to access the same port.

[snip]
>>> Is there a limit to the number of files on XP - like the old config.sys
>>> option files=3D99?
>> I don't know.
> Would archiving files to a separate directory help?

I don't know what functionality you are looking for, do you expect a limit =
on
the number of files on a directory?  Windows does have a limit on the size =
of a
path, and there is a limit on the number of files but it is pretty big (I d=
on't
remember it at the moment.)

[snip]
> Incidentally I tried something else today. I created a shell script junk.=
sh
> that did the following:
>=20
>         echo "starting problem program"
>         ./problem_program
>         echo "ending problem program"
>=20
> I ran this with=20
>         ./junk.sh > junk.txt
>=20
> Surprise, surprise in junk.txt I got=20
>         starting problem program
>         ending problem program
>=20
> with again none of problem_program's output!

This is only on one machine, right? just as if you are closing stdout.

There are many possibilities but none will stand if the program works one w=
ay on
a computer and another way on a different computer.  So the most probable c=
ause
is some difference between computers.

> * Is the chkdsk error significant, or is it just a "red herring" do you t=
hink?

I don't see how it could be a factor, but I may be missing something.  Bett=
er
try to see what's the cause (a damaged sector that cannot be remapped?).

> * Have you ever heard of anything similar on Linux/Unix?

Anything is possible.  For instance, an uninitialized pointer could cause
writing in the file descriptor table same effect as closing/changing those =
file
descriptors, if the program is not too complex I would use gdb to see the
execution at least once, if it is complex then better isolate the problem f=
irst.

> * Does windows have a lock on a file or something?

Yes.  You probably have seen it, when Windows doesn't allow you to delete a=
 file
because it is "in use" (try deleting all the .tmp files in your temp direct=
ory).

> * I'm sure I haven't, but if something in the program redirected 'stdout',
> would this have any affect like I'm experiencing - i.e. overriding the
> command line's redirection?

As I said, anything is possible.  The important clue is that it runs always=
 on
one computer, it never runs on another (I should really say "seems to").
--=20
Ren=E9 Berber


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/