winpexpect.py 文件源码

def _create_named_pipe(template, sids=None):
    """INTERNAL: create a named pipe."""
    if sids is None:
        sattrs = None
    else:
        sattrs = _create_security_attributes(*sids)
    for i in range(100):
        name = template % random.randint(0, 999999)
        try:
            pipe = CreateNamedPipe(name, PIPE_ACCESS_DUPLEX,
                                   0, 1, 1, 1, 100000, sattrs)
            SetHandleInformation(pipe, HANDLE_FLAG_INHERIT, 0)
        except WindowsError, e:
            if e.winerror != ERROR_PIPE_BUSY:
                raise
        else:
            return pipe, name
    raise ExceptionPexpect, 'Could not create pipe after 100 attempts.'