New submission from Serhiy Storchaka <storchaka+cpyt...@gmail.com>:
Local converters for file descriptors which uses PyObject_AsFileDescriptor() 
are defined and used in several files: Modules/fcntlmodule.c, 
Modules/posixmodule.c, Modules/selectmodule.c, Modules/termios.c.

The proposed PR replaces them all with a global private function 
_PyLong_FileDescriptor_Converter() and adds corresponding Argument Clinic 
converter "fildes".

In future it could be used in more places, allowing to pass a file with 
fileno() method to functions which accept file descriptor.

----------
components: Argument Clinic
messages: 378338
nosy: larry, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Argument Clinic: add converter for file descriptor
type: enhancement
versions: Python 3.10

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41985>
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