On Fri, Oct 6, 2017 at 4:27 PM, Thomas Jollans <t...@tjol.eu> wrote: > On 2017-10-06 17:01, eryk sun wrote: >> >> POSIX defines STDIN_FILENO as 0, and the Windows C runtime reserves FD >> 0 to map to the native StandardInput handle. But as I noted in a >> previous message, on Windows isatty(0) returns true if a process isn't >> executed with a valid StandardInput. In this case sys.stdin will be >> None, so call sys.stdin.fileno() and handle the exception if that >> fails. > > Seriously? sys.stdin can be None? That's terrifying.
Just check for None or handle the exception. It could be worse in Windows -- like inheriting broken standard I/O. This can happen if a console application is run without a console (i.e. dwCreationFlags=DETACHED_PROCESS) yet console handles are inherited in the standard handles via STARTUPINFO. isatty() will return True, but using the handles will fail. To avoid this problem with subprocess.Popen, if you use creationflags=DETACHED_PROCESS, make sure to set unused standard handles to subprocess.DEVNULL. -- https://mail.python.org/mailman/listinfo/python-list
