New submission from Sergei Lebedev <superbo...@gmail.com>:
Current `mmap` implementation raises a ValueError if a sum of offset and length
exceeds file size, as reported by `fstat`. While perfectly valid for most
use-cases, it doesn't work for "special" files, for example:
>>> with open("/proc/sys/debug/exception-trace", "r+b") as f:
... mmap.mmap(f.fileno(), 0)
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
ValueError: mmap offset is greater than file size
Same goes for almost any other /proc file, because most of them have S_ISREG()
== True and st_size = 0.
How about adding a keyword argument to `mmap.mmap()`, which disables
fstat-based size checks?
----------
components: Library (Lib)
messages: 140330
nosy: superbobry
priority: normal
severity: normal
status: open
title: Disable size checks in mmap.mmap()
type: feature request
versions: Python 2.6
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12556>
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