raised an error.

Replace them with using concrete types API that never fails if appropriate.

FreeBSD is the only platforms with unsigned FD_SETSIZE.

possible.  Patch is writen with Coccinelle.

EPOLL_CLOEXEC is the only value that can be passed
to epoll_create1() and we are passing EPOLL_CLOEXEC
unconditionally since Python 3.4.

Patch by Ed Schouten.

Patch by Matt Frank.

timeout when interrupted by a signal, except if the signal handler raises an
exception. This change is part of the PEP 475.

The asyncore and selectors module doesn't catch the InterruptedError exception
anymore when calling select.select(), since this function should not raise
InterruptedError anymore.

All these functions only accept positive timeouts, so this change has no effect
in practice.

by a signal (EINTR).

Modify devpoll_flush() to use _Py_write() instead of calling directly write().

* _Py_open() now raises exceptions on error. If open() fails, it raises an
  OSError with the filename.
* _Py_open() now releases the GIL while calling open()
* Add _Py_open_noraise() when _Py_open() cannot be used because the GIL is not
  held

Cast from time_t (64 bit) to long (32 bit). It should fix a compiler warning.

aways from zero, instead of rounding towards zero.

It should make test_asyncio more reliable, especially test_timeout_rounding() test.

poll and epoll

Improve also debug info to analyze the issue

towards zero

instead of rounding towards zero. For example, a timeout of one microsecond is
now rounded to one millisecond, instead of being rounded to zero.

The bug was introduced with the select.epoll module! So it's 5 years old :-)

descriptor

are now created non-inheritable; add functions os.get/set_inheritable(),
os.get/set_handle_inheritable() and socket.socket.get/set_inheritable().