gdbcontroller.py 文件源码

def _make_non_blocking(file_obj):
    """make file object non-blocking
    Windows doesn't have the fcntl module, but someone on
    stack overflow supplied this code as an answer, and it works
    http://stackoverflow.com/a/34504971/2893090"""

    if USING_WINDOWS:
        LPDWORD = POINTER(DWORD)
        PIPE_NOWAIT = wintypes.DWORD(0x00000001)

        SetNamedPipeHandleState = windll.kernel32.SetNamedPipeHandleState
        SetNamedPipeHandleState.argtypes = [HANDLE, LPDWORD, LPDWORD, LPDWORD]
        SetNamedPipeHandleState.restype = BOOL

        h = msvcrt.get_osfhandle(file_obj.fileno())

        res = windll.kernel32.SetNamedPipeHandleState(h, byref(PIPE_NOWAIT), None, None)
        if res == 0:
            raise ValueError(WinError())

    else:
        # Set the file status flag (F_SETFL) on the pipes to be non-blocking
        # so we can attempt to read from a pipe with no new data without locking
        # the program up
        fcntl.fcntl(file_obj, fcntl.F_SETFL, os.O_NONBLOCK)