I/O Multiplexing: select and poll

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Function shutdown #include int shutdown(int sockfd, int howto); howto: SHUT_RD, SHUT_WR, SHUT_RDWR returns: 0 if OK, -1 on error •initiates TCP normal termination regardless of descriptor’s reference count •selectively closes one direction of the connection (SHUT_RD or SHUT_WR) 24
Rewrite str_cli with select and shutdown #include "unp.h" select/strcliselect02.c void str_cli(FILE *fp, int sockfd) { int fd_set rset; char maxfdp1, stdineof; 判斷 client 至 server 方向連結是否已斷的旗標變數 sendline[MAXLINE], recvline[MAXLINE]; stdineof = 0; FD_ZERO(&rset); 當 client 至 server 方向連結 for ( ; ; ) { 未斷時才要 test stdin if (stdineof == 0) FD_SET(fileno(fp), &rset); FD_SET(sockfd, &rset); maxfdp1 = max(fileno(fp), sockfd) + 1; Select(maxfdp1, &rset, NULL, NULL, NULL); 25
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: Solution: UseShutdown Instead ofClo
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 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 =

I/O Multiplexing: select and poll

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