Mimicking basic fcntl or SetHandleInformation call in .Net
- by Tristan
Tornado enables win32 support by faking Python's fcntl function using SetHandleInformation, which is available via ctypes on Windows. After some other small fixes, this actually works using IronPython on Windows as well (sadly, IronPython is five times slower).
I'd like to get Tornado working on any CLI platform, such using Mono on OSX or Linux. Is there a managed, cross-platform, .Net approach that can fake fcntl?
Here's the win32 code from Tornado:
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:
fd = int(fd)
success = SetHandleInformation(fd, HANDLE_FLAG_INHERIT, arg)
if not success:
raise ctypes.GetLastError()
else:
raise ValueError("Unsupported arg")
else:
raise ValueError("Unsupported op")
