New submission from Christophe Kalt <pyt...@ote.taranis.org>:
The following snippet of code is a concise way to exhibit the problem:
import os
wr = open('/tmp/test', 'w')
wr.write('oink\noink\n')
rd = open('/tmp/test', 'r')
rdlns = open('/tmp/test', 'r')
# first, read til EOF is reached (which is right away)
assert len(rd.read()) == 0
assert len(rdlns.readlines()) == 0
# add data to the file
wr.flush()
# try to read again
print 'read : ', rd.read().split() # fails
print 'readlines: ', rdlns.readlines() # fails
print 'readline : ', rdlns.readline().strip() # succeeds
# cleanup
wr.close()
rd.close()
rdlns.close()
os.remove('/tmp/test')
On Linux, here is the output:
$ python2.6 src/readlines.py
read : ['oink', 'oink']
readlines: ['oink\n', 'oink\n']
readline :
On Solaris, here is the output:
$ python src/readlines.py
read : []
readlines: []
readline : oink
The problems comes from the fact that once EOF is reached, nothing more will be
read from the file on subsequent reads, as noted in the manual page
(http://docs.sun.com/app/docs/doc/816-5168/getchar-3c?a=view):
"If the stream is at end-of-file, the end-of-file indicator for the stream is
set and these functions return EOF. For standard-conforming (see standards(5))
applications, if the end-of-file indicator for the stream is set, these
functions return EOF whether or not the stream is at end-of-file."
The attached diff fixes the problem.
----------
assignee: theller
components: ctypes
files: fileobject.diff
keywords: patch
messages: 106999
nosy: kalt, theller
priority: normal
severity: normal
status: open
title: file.{read,readlines} behaviour on Solaris
type: behavior
versions: Python 2.6
Added file: http://bugs.python.org/file17542/fileobject.diff
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue8893>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
