Bugs item #1124861, was opened at 2005-02-17 09:23
Message generated for change (Comment added) made by bediviere
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Category: Windows
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: davids (davidschein)
Assigned to: Nobody/Anonymous (nobody)
Summary: GetStdHandle in interactive GUI
Initial Comment:
Using the suprocess module from with IDLE or PyWindows,
it appears that calls GetStdHandle (STD_<???>_HANDLE)
returns None, which causes an error. (All appears fine
on Linux, the standard Python command-line, and ipython.)
For example:
>>> import subprocess
>>> p = subprocess.Popen("dir", stdout=subprocess.PIPE)
Traceback (most recent call last):
File "<pyshell#49>", line 1, in -toplevel-
p = subprocess.Popen("dir", stdout=subprocess.PIPE)
File "C:\Python24\lib\subprocess.py", line 545, in
__init__
(p2cread, p2cwrite,
File "C:\Python24\lib\subprocess.py", line 605, in
_get_handles
p2cread = self._make_inheritable(p2cread)
File "C:\Python24\lib\subprocess.py", line 646, in
_make_inheritable
DUPLICATE_SAME_ACCESS)
TypeError: an integer is required
The error originates in the mswindows implementation of
_get_handles. You need to set one of stdin, stdout, or
strerr because the first line in the method is:
if stdin == None and stdout == None and stderr == None:
...return (None, None, None, None, None, None)
I added "if not handle: return GetCurrentProcess()" to
_make_inheritable() as below and it worked. Of course,
I really do not know what is going on, so I am letting
go now...
def _make_inheritable(self, handle):
..."""Return a duplicate of handle, which is inheritable"""
...if not handle: return GetCurrentProcess()
...return DuplicateHandle(GetCurrentProcess(), handle,
....................................GetCurrentProcess(),
0, 1,
....................................DUPLICATE_SAME_ACCESS)
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Comment By: Steven Bethard (bediviere)
Date: 2005-08-13 14:37
Message:
Logged In: YES
user_id=945502
I ran into a similar problem in Ellogon (www.ellogon.org)
which interfaces with Python through tclpython
(http://jfontain.free.fr/tclpython.htm).
My current workaround is to always set all of stdin, stdout,
and stderr to subprocess.PIPE. I never use the stderr pipe,
but at least this keeps the broken GetStdHandle calls from
happening.
Looking at the code, I kinda think the fix should be::
if handle is None:
return handle
return DuplicateHandle(GetCurrentProcess(), ...
where if handle is None, it stays None. But I'm also
probably in over my head here.
----------------------------------------------------------------------
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