如果有完整的行，我怎么能从IO :: Socket :: INET文件句柄中读取？

When reading from a IO::Socket::INET filehandle it can not be assumed that there will always be data available on the stream. What techniques are available to either peek at the stream to check if data is available or when doing the read take no data without a valid line termination and immediately pass through the read? filehandle