I/O Multiplexing: select and poll

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Solutions to the Attack •When a server is handling multiple clients the server can never block in a function call related to a single client •Possible solutions: –Use nonblocking I/O (Ch. 15) –separate thread/process for each client –timeout on I/O operations (Sec. 13.2) 34
poll Function: polling more specific conditions than select 結構陣列儲存位址陣列中的資料數目微秒 #include int poll (struct pollfd *fdarray, unsigned long ndfs, int timeout); returns: count of ready descriptors, 0 on timeout, -1 on error 每個 descriptor 要 test 的條件是用 pollfd 結構來表示這些 pollfd 結構集合成一個陣列 struct pollfd { 要測的 file descriptor number; -1 表此結構無效 int fd; /* a descriptor to poll */ short events; /* events of interested fd, value argument */ short revents; /* events that occurred on fd, result argument */ }; 要測試的條件真正測到的事件 35
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: Denial of Service Attacks • 問
Page 37 and 38: 設定 events 與測試 revents
Page 39 and 40: Concurrent TCP Echo Server with pol
Page 41 and 42: tcpcliserv/tcpservpoll01.c Initiali
Page 43 and 44: tcpcliserv/tcpservpoll01.c for (i =

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