On 08/28/2012 04:45 PM, Adam Barta wrote:
Thanks
Okay looks like the culprit is *sshfs* I tried it my side and it seems
to fail when using it that way. I guess the problem is that *fuse*
just wont let you read a zero byte file.
I never thought of that! Thanks. There's Glenn's approach which is a
bit more complex.
It might be possible to trick fuse by making a character device.
(mknod or mkfifo)
I suspect that given the learning curve that would involve for me, pyro
will be the way to go.
Thanks for helping me track it down.
Out of curiosity, do you know why the files sizes are correct at the
beginning and don't stay that way?
Tom
Adam
On Wed, Aug 29, 2012 at 1:36 AM, Tom Kuiper <[email protected]
<mailto:[email protected]>> wrote:
On 08/28/2012 04:24 PM, Adam Barta wrote:
Could you share a code snippet?
Here's the code.
If you cat the file to hd does it read correctly even with the
zero filesize?
I'll have to make a small mod before trying that. I'll let you know.
Tom
On Wed, Aug 29, 2012 at 1:19 AM, Tom Kuiper <[email protected]
<mailto:[email protected]>> wrote:
On 08/28/2012 04:11 PM, Adam Barta wrote:
is it possible that ipython is not actually closing the file
but keeping the file descriptor open behind your back, if so
then seeking to 0 might solve it?
Clever idea! but, alas, Python is cleverer than that. I put
a seek(0) after (re)opening the file and before reading.
Still get 0 bytes back.
I'm not having much luck in finding a way to change the file
size. There is a 'truncate' method that will do it but Linux
will zero fill an extended file.
Cheers
Tom
On Wed, Aug 29, 2012 at 1:00 AM, Tom Kuiper
<[email protected] <mailto:[email protected]>> wrote:
On 08/28/2012 03:54 PM, David MacMahon wrote:
On Aug 28, 2012, at 3:39 PM, Tom Kuiper wrote:
I don't know how to get Python to read more than
teh nominal file size if it is supposed to look
like a file.
If you want to read the register value a second
time, you need to seek to the beginning of the file
first, then read four bytes. You should be able to
repeat the seek/read pattern as many times as you want.
I close the file after I write to it and open it again
for the read. After I write to the file, "ls -l" gives
a size of zero instead of 4.
If that's not what's confusing you, can you please
clarify what is?
I am not trying to mix reads and writes on an open file.
I know about seek and tell if that were what I wanted
to do.
Tom
--
*Adam Barta*
c: +27 72 105 8611 <tel:%2B27%2072%20105%208611>
e: [email protected] <mailto:[email protected]>
w: www.ska.ac.za <http://www.ska.ac.za>
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I or me?http://www.oxforddictionaries.com/page/145
--
*Adam Barta*
c: +27 72 105 8611 <tel:%2B27%2072%20105%208611>
e: [email protected] <mailto:[email protected]>
w: www.ska.ac.za <http://www.ska.ac.za>
--
I or me?http://www.oxforddictionaries.com/page/145
--
*Adam Barta*
c: +27 72 105 8611
e: [email protected] <mailto:[email protected]>
w: www.ska.ac.za <http://www.ska.ac.za>
--
I or me? http://www.oxforddictionaries.com/page/145
