Eryk Sun added the comment:
The following is an example of the problem, right?
>>> fd = os.open('stdout.txt', os.O_CREAT | os.O_WRONLY)
>>> os.dup2(fd, 1)
>>> print('spam')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
OSError: [WinError 87] The parameter is incorrect
Code like this used to work, so possibly this needs to be addressed more
generally. I have a couple ideas, but they're major changes. It's simpler to
require code that pulls the rug out from under _WindowsConsoleIO to rebind
sys.std*.
For a counterexample, PyOS_StdioReadline always checks for a console and falls
back on the old my_fgets function for a non-console. For example:
>>> open('stdin.txt', 'w').write('x=42; os.dup2(oldfd, 0)\n')
24
>>> fd = os.open('stdin.txt', os.O_RDONLY)
>>> oldfd = os.dup(0); os.dup2(fd, 0)
>>> Breakpoint 0 hit
python36!my_fgets:
00000000`66e98318 488bc4 mov rax,rsp
0:000> g
>>> x
42
----------
keywords: +3.2regression
nosy: +eryksun
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