On Fri, 20 Mar 2009 at 07:09, Sreejith K wrote:
On Mar 20, 4:43?pm, "R. David Murray" <rdmur...@bitdance.com> wrote:
Sreejith K <sreejith...@gmail.com> wrote:
Hi,
snapdir = './mango.txt_snaps'
snap_cnt = 1
block = 0
import os
os.chdir('/mnt/gfs_local')
snap = open(snapdir + '/snap%s/%s' % (repr(snap_cnt), repr(block)),'r')
snap.read()
'dfdfdgagdfgdf\ngdgfadgagadg\nagafg\n\nfs\nf\nsadf\n\nsdfsdfsadf\n'
snapdir + '/snap%s/%s' % (repr(snap_cnt), repr(block))
'./mango.txt_snaps/snap1/0'
The above code works fine and it reads the wholefiletill EOF. But
when this method is used in a different scenario thefileis notread
completely. I'll post the code thatreadonly some part of thefile...
self.snap = open(self.snapdir + '/snap%d/%d' % (self.snap_cnt,
block),'r') ## opens /mnt/gfs_local/mango.txt_snaps/snap1/0
self.snap.seek(off%4096) ## seeks to 0 in this case
bend = 4096-(off%4096) ## 4096 in this case
if length-bend <= 0: ? ?## true in this case as length is 4096
? ?tf.writelines("returned \n")
? ?data = self.snap.read(length)
? ?self.snap.close()
? ?break
the output data is supposed toreadthe whole fie but it only reads a
part of it. Why is it encountering an early EOF ?
It's not. ?In the second case you told it toreadonly 4096 bytes. ?You
might want toreadthe docs for the 'read' method, paying particular
attention to the optional argument and its meaning.
--
R. David Murray ? ? ? ? ?http://www.bitdance.com
Thanks for the reply,
Actually the file is only few bytes and file.read() and file.read
(4096) will give the same result, i.e the whole file. But in my case
its not happening (using it in python-fuse file class).. Any other
ideas ?
Not offhand. If it were me I'd start playing with parameters and moving
things around, trying to find additional clues. See if calling read
without the argument in the second case works, start stripping the second
case down until it starts working (even if wrongly for the ultimate goal),
and things like that.
--
R. David Murray http://www.bitdance.com
--
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