pipeline.py 文件源码

def getFd(self, pio):
        "get file descriptor for given PInOut object"
        if self.fd is None:
            if isinstance(pio, PIn):
                self.fd = os.open(self.path, os.O_RDONLY)
            elif self.append:
                self.fd = os.open(self.path, os.O_WRONLY|os.O_CREAT|os.O_APPEND, 0666)
            else:
                self.fd = os.open(self.path, os.O_WRONLY|os.O_CREAT|os.O_TRUNC, 0666)
        return self.fd