[Python-bugs-list] [ python-Bugs-570044 ] "python -u" not binary on cygwin
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Fri, 09 Aug 2002 08:10:21 -0700
Bugs item #570044, was opened at 2002-06-17 15:56
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Category: Python Interpreter Core
Group: None
>Status: Closed
Resolution: Accepted
Priority: 5
Submitted By: Sjoerd Mullender (sjoerd)
Assigned to: Martin v. Löwis (loewis)
>Summary: "python -u" not binary on cygwin
Initial Comment:
python -u is supposed to put sys.stdin and sys.stdout
in binary mode on systems where such things matter.
This does not happen on Window under Cygwin.
Try
python -u -c 'import sys;
open("x","wb").write(sys.stdin.read())' < some-text-file
and notice that the newly created file "x" has just \n
line endings instead of \r\n.
A patch is included.
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>Comment By: Sjoerd Mullender (sjoerd)
Date: 2002-08-09 17:10
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Closed this bug.
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Comment By: Jason Tishler (jlt63)
Date: 2002-08-09 17:03
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> I guess we can close this now?
Yes.
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Comment By: Sjoerd Mullender (sjoerd)
Date: 2002-08-09 16:41
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mount -p says
Prefix Type Flags
/cygdrive system binmode
Now that I look more carefully at the mount output, I see
that my current directory was mounted twice, once in
textmode and once in binmode. To make a long story short,
the python I tried this on was running on textmode mount.
I guess we can close this now?
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Comment By: Jason Tishler (jlt63)
Date: 2002-08-09 16:24
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> I checked in the changes.
Thanks!
> If a execute the command "mount" it mentions
> "binmode" on every line, so I guess that means
> I'm not using text mode.
What does "mount -p" indicate? If textmode, was
your current working directory under the cygdrive
prefix? If so, then we completely under this
issue. If not, then I'm at a loss to explain your
reported behavior.
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Comment By: Sjoerd Mullender (sjoerd)
Date: 2002-08-09 15:38
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I checked in the changes.
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Comment By: Sjoerd Mullender (sjoerd)
Date: 2002-08-09 15:26
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If a execute the command "mount" it mentions "binmode" on
every line, so I guess that means I'm not using text mode.
I think the documentation should be extended to mention this
binary mode stuff, but that should be a separate bug report.
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Comment By: Martin v. Löwis (loewis)
Date: 2002-08-09 15:18
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The patch is fine, please apply it. Also add a note to
python.man documenting that this changes the streams to
binary mode.
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Comment By: Jason Tishler (jlt63)
Date: 2002-08-09 15:10
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Martin,
This looks good. Can I commit it?
Sjoerd,
> Does the patch make sense on other Cygwin
> installations than my own?
Yes, see below for the details.
My WAG is that you are using text mode mounts. Is
this correct? In my testing, I could only reproduce
this problem under text mode mounts -- never under
binary mode mounts. Nevertheless, this patch
should be applied to guarantee proper behavior
regardless of the user's mount table.
Thanks for tracking down this issue and providing
a patch to fix it.
I wonder if there are any other binary vs. text
mode issues lurking...
BTW, the man page states the following:
-u Force stdin, stdout and stderr to be
totally unbuffered.
However, after reading the code, it is clear that
the "-u" option does more... :,)
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Comment By: Sjoerd Mullender (sjoerd)
Date: 2002-08-09 10:26
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Assigned to Jason, since he seems to be the Cygwin expert. :-)
Does the patch make sense on other Cygwin installations than
my own?
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