124 lines
4.2 KiB
Python
124 lines
4.2 KiB
Python
# NOTE: win32 support is currently experimental, and not recommended
|
|
# for production use.
|
|
|
|
import ctypes
|
|
import ctypes.wintypes
|
|
import os
|
|
import socket
|
|
import errno
|
|
|
|
|
|
# See: http://msdn.microsoft.com/en-us/library/ms738573(VS.85).aspx
|
|
ioctlsocket = ctypes.windll.ws2_32.ioctlsocket
|
|
ioctlsocket.argtypes = (ctypes.wintypes.HANDLE, ctypes.wintypes.LONG, ctypes.wintypes.ULONG)
|
|
ioctlsocket.restype = ctypes.c_int
|
|
|
|
# See: http://msdn.microsoft.com/en-us/library/ms724935(VS.85).aspx
|
|
SetHandleInformation = ctypes.windll.kernel32.SetHandleInformation
|
|
SetHandleInformation.argtypes = (ctypes.wintypes.HANDLE, ctypes.wintypes.DWORD, ctypes.wintypes.DWORD)
|
|
SetHandleInformation.restype = ctypes.wintypes.BOOL
|
|
|
|
HANDLE_FLAG_INHERIT = 0x00000001
|
|
|
|
|
|
F_GETFD = 1
|
|
F_SETFD = 2
|
|
F_GETFL = 3
|
|
F_SETFL = 4
|
|
|
|
FD_CLOEXEC = 1
|
|
|
|
os.O_NONBLOCK = 2048
|
|
|
|
FIONBIO = 126
|
|
|
|
|
|
def fcntl(fd, op, arg=0):
|
|
if op == F_GETFD or op == F_GETFL:
|
|
return 0
|
|
elif op == F_SETFD:
|
|
# Check that the flag is CLOEXEC and translate
|
|
if arg == FD_CLOEXEC:
|
|
success = SetHandleInformation(fd, HANDLE_FLAG_INHERIT, arg)
|
|
if not success:
|
|
raise ctypes.GetLastError()
|
|
else:
|
|
raise ValueError("Unsupported arg")
|
|
#elif op == F_SETFL:
|
|
## Check that the flag is NONBLOCK and translate
|
|
#if arg == os.O_NONBLOCK:
|
|
##pass
|
|
#result = ioctlsocket(fd, FIONBIO, 1)
|
|
#if result != 0:
|
|
#raise ctypes.GetLastError()
|
|
#else:
|
|
#raise ValueError("Unsupported arg")
|
|
else:
|
|
raise ValueError("Unsupported op")
|
|
|
|
|
|
class Pipe(object):
|
|
"""Create an OS independent asynchronous pipe"""
|
|
def __init__(self):
|
|
# Based on Zope async.py: http://svn.zope.org/zc.ngi/trunk/src/zc/ngi/async.py
|
|
|
|
self.writer = socket.socket()
|
|
# Disable buffering -- pulling the trigger sends 1 byte,
|
|
# and we want that sent immediately, to wake up ASAP.
|
|
self.writer.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
|
|
|
|
count = 0
|
|
while 1:
|
|
count += 1
|
|
# Bind to a local port; for efficiency, let the OS pick
|
|
# a free port for us.
|
|
# Unfortunately, stress tests showed that we may not
|
|
# be able to connect to that port ("Address already in
|
|
# use") despite that the OS picked it. This appears
|
|
# to be a race bug in the Windows socket implementation.
|
|
# So we loop until a connect() succeeds (almost always
|
|
# on the first try). See the long thread at
|
|
# http://mail.zope.org/pipermail/zope/2005-July/160433.html
|
|
# for hideous details.
|
|
a = socket.socket()
|
|
a.bind(("127.0.0.1", 0))
|
|
connect_address = a.getsockname() # assigned (host, port) pair
|
|
a.listen(1)
|
|
try:
|
|
self.writer.connect(connect_address)
|
|
break # success
|
|
except socket.error, detail:
|
|
if detail[0] != errno.WSAEADDRINUSE:
|
|
# "Address already in use" is the only error
|
|
# I've seen on two WinXP Pro SP2 boxes, under
|
|
# Pythons 2.3.5 and 2.4.1.
|
|
raise
|
|
# (10048, 'Address already in use')
|
|
# assert count <= 2 # never triggered in Tim's tests
|
|
if count >= 10: # I've never seen it go above 2
|
|
a.close()
|
|
self.writer.close()
|
|
raise socket.error("Cannot bind trigger!")
|
|
# Close `a` and try again. Note: I originally put a short
|
|
# sleep() here, but it didn't appear to help or hurt.
|
|
a.close()
|
|
|
|
self.reader, addr = a.accept()
|
|
self.reader.setblocking(0)
|
|
self.writer.setblocking(0)
|
|
a.close()
|
|
self.reader_fd = self.reader.fileno()
|
|
|
|
def read(self):
|
|
"""Emulate a file descriptors read method"""
|
|
try:
|
|
return self.reader.recv(1)
|
|
except socket.error, ex:
|
|
if ex.args[0] == errno.EWOULDBLOCK:
|
|
raise IOError
|
|
raise
|
|
|
|
def write(self, data):
|
|
"""Emulate a file descriptors write method"""
|
|
return self.writer.send(data)
|