I/O Multiplexing: select and poll

select Fucntion
OR
•We can call select and tell the kernel to
return only when
–any descriptor in {1, 4, 5} is ready for
reading (buffer 中 已 有 資 料 )
–any descriptor in {2, 7} is ready for writing
–any descriptor in {1, 4} has an exception
condition pending
–after 10.2 seconds have elapsed
Buffer
中 已 有
空 間
裝 置 有 例
外 狀 況
10