[Patches] [ python-Patches-410547 ] os.statvfs support for Windows
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Fri, 30 Mar 2001 04:22:33 -0800
Patches item #410547, was updated on 2001-03-22 08:58
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Category: Windows
Group: None
Status: Open
>Priority: 3
Submitted By: Fredrik Lundh (effbot)
>Assigned to: Fredrik Lundh (effbot)
Summary: os.statvfs support for Windows
Initial Comment:
This patch adds (partial) os.statvfs support for
Windows.
The FRSIZE, BLOCKS, BFREE, BAVAIL, and NAMEMAX
fields are set. Remaining fields are set to
zero, but should probably be set to None.
</F>
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>Comment By: Guido van Rossum (gvanrossum)
Date: 2001-03-30 04:22
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Thanks for the investigation, Tim!
Bouncing it back to Fredrik and lowered priority.
I certainly don't want to spend a lot of time on it; I
believe that the flamewar that started this was ill-advised
anyway. Finding out free space is hard; too bad.
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Comment By: Tim Peters (tim_one)
Date: 2001-03-29 20:13
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No, it did not go in. I asked for a doc patch first so I
wouldn't have to pee away time trying to guess what it
does. Now I've peed away the time, and I don't like it.
Here's what it returns on my home desktop box (Win98SE,
20Gb drive):
>>> os.statvfs("c:\") # argument is very touchy
(32768, 32768, 65526, 65526, 65526, 0, 0, 0, 0, 1024)
>>>
*Nothing* there makes sense, except for the last "max path"
result. Even the "block size" is wrong (the FAT32 fs on
this box uses 16Kb clusters, not 32Kb). Digging into the
MS docs,
"""The GetDiskFreeSpace function returns incorrect values
for volumes that are larger than 2 gigabytes"""
and
"""Even on volumes that are smaller than 2 gigabytes, the
values stored into *lpSectorsPerCluster,
*lpNumberOfFreeClusters, and *lpTotalNumberOfClusters
values may be incorrect"""
under Win95, and, to judge from my desktop box, it appears
useless under the latest flavor of Win98 too.
The function the patch uses is obsolete, and a ...Ex
version is recommended in its place, which
"""returns correct values for all volumes, including those
that are greater than 2 gigabytes"""
BUT, *that* function isn't available under the original
Win95, only under Win95 OSR2 and later. In addition, that
function only returns number of bytes total and free (as 64
bit unsigned ints), nothing about block size, # clusters,
etc. (OTOH, total bytes is free is what people asked for!
I don't recall anyone asking for a statvfs() clone)
So bouncing back to you: how much time do you want me to
devote to this?
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Comment By: Guido van Rossum (gvanrossum)
Date: 2001-03-29 09:28
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Tim, wasn't this supposed to go into 2.1b2? Did it? Can it
go into 2.1final?
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Comment By: Tim Peters (tim_one)
Date: 2001-03-22 13:35
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/F, can you add a doc patch (for os.statvfs) that says
enough so that a Windows user has some chance of guessing
what this function returns?
BTW, I have no problem w/ returning zeroes instead of Nones.
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