Eryk Sun added the comment:
Windows doesn't have terminal devices, so the C runtime's isatty() function
just checks for a character device, which includes NUL among others.
This can lead to hanging the REPL, albeit with a contrived example such as
redirecting stdin to COM3:
C:\>python < COM3
Python 3.5.2 (v3.5.2:4def2a2901a5, Jun 25 2016, 22:18:55)
[MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> ^C
Ctrl+C doesn't work because the main thread is blocked (we'd have to call
CancelSynchronousIo in the C signal handler). I killed the process using the
default Ctrl+Break handler. "^C" was printed by the cmd shell's Ctrl+Break
handler.
I don't think the CRT's check for a character device is generally useful. It
could be replaced with a check that specifically looks for a console handle
(e.g. by calling GetConsoleMode), which is what someone calling isatty()
generally wants to know.
----------
components: +IO
nosy: +eryksun
versions: +Python 3.6, Python 3.7
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