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# pylint: disable=no-member
# This module is only used to create and compile the gevent._corecffi module;
# nothing should be directly imported from it except `ffi`, which should only be
# used for `ffi.compile()`; programs should import gevent._corecfffi.
# However, because we are using "out-of-line" mode, it is necessary to examine
# this file to know what functions are created and available on the generated
# module.
from __future__ import absolute_import, print_function
import sys
import os
import os.path # pylint:disable=no-name-in-module
import struct
__all__ = []
def system_bits():
return struct.calcsize('P') * 8
def st_nlink_type():
if sys.platform == "darwin" or sys.platform.startswith("freebsd"):
return "short"
if system_bits() == 32:
return "unsigned long"
return "long long"
from cffi import FFI
ffi = FFI()
thisdir = os.path.dirname(os.path.abspath(__file__))
def read_source(name):
with open(os.path.join(thisdir, name), 'r') as f:
return f.read()
_cdef = read_source('_corecffi_cdef.c')
_source = read_source('_corecffi_source.c')
_cdef = _cdef.replace('#define GEVENT_ST_NLINK_T int', '')
_cdef = _cdef.replace('#define GEVENT_STRUCT_DONE int', '')
_cdef = _cdef.replace('GEVENT_ST_NLINK_T', st_nlink_type())
_cdef = _cdef.replace("GEVENT_STRUCT_DONE _;", '...;')
if sys.platform.startswith('win'):
# We must have the vfd_open, etc, functions on
# Windows. But on other platforms, going through
# CFFI to just return the file-descriptor is slower
# than just doing it in Python, so we check for and
# workaround their absence in corecffi.py
_cdef += """
typedef int... vfd_socket_t;
int vfd_open(vfd_socket_t);
vfd_socket_t vfd_get(int);
void vfd_free(int);
"""
include_dirs = [
thisdir, # libev_vfd.h
os.path.abspath(os.path.join(thisdir, '..', '..', '..', 'deps', 'libev')),
]
ffi.cdef(_cdef)
ffi.set_source('gevent.libev._corecffi', _source, include_dirs=include_dirs)
if __name__ == '__main__':
# XXX: Note, on Windows, we would need to specify the external libraries
# that should be linked in, such as ws2_32 and (because libev_vfd.h makes
# Python.h calls) the proper Python library---at least for PyPy. I never got
# that to work though, and calling python functions is strongly discouraged
# from CFFI code.
ffi.compile()
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