getentropy() is used (OpenBSD 5.6+).

(OpenBSD 5.6+).

implementation is used.

Add _Py_fstat_noraise() function when a Python exception is not welcome.

read() is interrupted by a signal.

dev_urandom_python() now calls _Py_read() helper instead of calling directly
read().

opening /dev/urandom.

and stored in pyconfig.h as the new HAVE_GETRANDOM_SYSCALL define.

Fix os.urandom() tests using file descriptors if os.urandom() uses getrandom().

available, syscall introduced in the Linux kernel 3.17. It is more reliable
and more secure, because it avoids the need of a file descriptor and waits
until the kernel has enough entropy.

* _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

fstat() may fail with EOVERFLOW on files larger than 2 GB because the file size type is an signed 32-bit integer.