I/O Multiplexing: select and poll

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Three Classes of Data Identified by poll •normal, priority band, and high priority normal priority band high priority All regular TCP data x All UDP data x TCP’s out-of-band data x Half-closed TCP x Error for TCP x (or POLLERR) New connection x x 38
Concurrent TCP Echo Server with poll •When using select, the server maintains array client[ ] and descriptor set rset. When using poll, the server maintains array client of pollfd structure. •Program flow: –allocate array of pollfd structures –initialize (listening socket: first entry in client) (set POLLRDNORM in events) –call poll; check for new connection (check, in revents, and set, in events, POLLRDNORM) –check for data on an existing connection (check POLLRDNORM or POLLERR in revents) 39
Page 1 and 2: I/O Multiplexing: select and poll
Page 3 and 4: I/O 動作如何進行 •
Page 5 and 6: Comparison of Five I/O Models block
Page 7 and 8: 對輸入裝置使用 select
Page 9 and 10: select Function #include #include
Page 11 and 12: Specifying Descriptor Values •We
Page 13 and 14: Low-Water Mark ( 低水位 ) •
Page 15 and 16: Ch. 5 兩個版本的比較 C
Page 17 and 18: Rewrite str_cli Function with selec
Page 19 and 20: 使用 select 函數常犯的
Page 21 and 22: Stop-and-Wait (Interactive) Mode
Page 23 and 24: Solution: UseShutdown Instead ofClo
Page 25 and 26: Rewrite str_cli with select and shu
Page 27 and 28: Concurrent TCP Echo Server with sel
Page 29 and 30: Initialization (cont.) tcpcliserv/t
Page 31 and 32: Loop (cont.) tcpcliserv/tcpservsele
Page 33 and 34: Denial of Service Attacks • 問
Page 35 and 36: poll Function: polling more specifi
Page 37: 設定 events 與測試 revents
Page 41 and 42: tcpcliserv/tcpservpoll01.c Initiali
Page 43 and 44: tcpcliserv/tcpservpoll01.c for (i =

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