[Python-bugs-list] [ python-Bugs-577782 ] resire readonly memory mapped file

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Bugs item #577782, was opened at 2002-07-05 10:07
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Category: Windows
Group: None
Status: Open
>Resolution: Works For Me
Priority: 5
Submitted By: Grzegorz Makarewicz (makaron)
Assigned to: Tim Peters (tim_one)
Summary: resire readonly memory mapped file

Initial Comment:

When file is open as readonly and mmf if created as R/O
too, then resizing this mapping will change its
protection and desired acces to read-write.

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>Comment By: Tim Peters (tim_one)
Date: 2002-08-27 16:09

Message:
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user_id=31435

Which version of Python are you talking about?  Also, please 
give a concrete example so we don't have to guess at what 
you mean.  Here's mine:

"""
import mmap

f = open('in.txt', 'rb')
m = mmap.mmap(f.fileno(), 0, 
access=mmap.ACCESS_READ)
f.close()

print `m[:]`
m.resize(5)
"""
The m.resizes() attempt yields a TypeError, "mmap can't 
resize a readonly or copy-on-write memory map".  I tried this 
under current CVS, and under 2.2.1, on Win2K.


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