gh-82500: Fix asyncio sendfile overflow on 32bit

[bdraco]

asyncio has the same issue

This is the same patch we have been running for a while with Home Assistant https://raw.githubusercontent.com/home-assistant/docker-base/master/python/3.11/asynctio_unix_events.patch

• Issue: shutil.copyfile(): os.sendfile() fails with OverflowError on 32-bit system #82500

related issue and trace home-assistant/supervisor#4375

File "/usr/local/lib/python3.11/site-packages/aiohttp/web_protocol.py", line 458, in _handle_request
   reset = await self.finish_response(request, resp, start_time)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/usr/local/lib/python3.11/site-packages/aiohttp/web_protocol.py", line 611, in finish_response
   await prepare_meth(request)
 File "/usr/local/lib/python3.11/site-packages/aiohttp/web_fileresponse.py", line 286, in prepare
   return await self._sendfile(request, fobj, offset, count)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/usr/local/lib/python3.11/site-packages/aiohttp/web_fileresponse.py", line 99, in _sendfile
   await loop.sendfile(transport, fobj, offset, count)
 File "/usr/local/lib/python3.11/asyncio/base_events.py", line 1185, in sendfile
   return await self._sendfile_native(transport, file,
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/usr/local/lib/python3.11/asyncio/selector_events.py", line 725, in _sendfile_native
   return await self.sock_sendfile(transp._sock, file, offset, count,
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/usr/local/lib/python3.11/asyncio/base_events.py", line 881, in sock_sendfile
   return await self._sock_sendfile_native(sock, file,
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/usr/local/lib/python3.11/asyncio/unix_events.py", line 373, in _sock_sendfile_native
   return await fut
          ^^^^^^^^^
 File "/usr/local/lib/python3.11/asyncio/unix_events.py", line 395, in _sock_sendfile_native_impl
   sent = os.sendfile(fd, fileno, offset, blocksize)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
OverflowError: Python int too large to convert to C ssize_t

[gvanrossum]

Thanks, this is definitely worth fixing. I have a few nits.

[gvanrossum]

Thanks!

[bdraco]

thanks