{"id":176,"date":"2016-04-09T17:46:16","date_gmt":"2016-04-09T17:46:16","guid":{"rendered":""},"modified":"2016-04-09T17:46:16","modified_gmt":"2016-04-09T17:46:16","slug":"","status":"publish","type":"post","link":"http:\/\/weizn.net\/?p=176","title":{"rendered":"I\/O\u591a\u8def\u590d\u7528\u4e2dselect\u6a21\u578b\u7684\u6d88\u606f\u89e6\u53d1\u5f62\u5f0f"},"content":{"rendered":"

\n\t    \u5728I\/O\u591a\u8def\u590d\u7528\u4e2d\uff0c\u6d88\u606f\u6709\u4e24\u79cd\u4e0d\u540c\u7684\u89e6\u53d1\u65b9\u5f0f\uff0c\u5206\u522b\u662f\uff1a<\/span>\n<\/p>\n

\n\t    \u6c34\u5e73\u89e6\u53d1(level-triggered\uff0c\u4e5f\u88ab\u79f0\u4e3a\u6761\u4ef6\u89e6\u53d1)LT:  \u53ea\u8981\u6ee1\u8db3\u6761\u4ef6\uff0c\u5c31\u89e6\u53d1\u4e00\u4e2a\u4e8b\u4ef6(\u53ea\u8981\u6709\u6570\u636e\u6ca1\u6709\u88ab\u83b7\u53d6\uff0c\u5185\u6838\u5c31\u4e0d\u65ad\u901a\u77e5\u4f60) \u3002<\/span>\n<\/p>\n

\n\t    \u8fb9\u7f18\u89e6\u53d1(edge-triggered)ET: \u6bcf\u5f53\u72b6\u6001\u53d8\u5316\u65f6\uff0c\u89e6\u53d1\u4e00\u4e2a\u4e8b\u4ef6\u3002<\/span>\n<\/p>\n

\n\t
\n<\/span>\n<\/p>\n

\n\t<\/span>\n<\/p>\n

\n\t    \u4e00\u822c\u5728I\/O\u591a\u8def\u590d\u7528\u4e2d\uff0c\u6709\u4e09\u4e2a\u7ecf\u5178\u7684\u6a21\u578b\uff0c\u5206\u522b\u662f\uff1aselect\u3001poll\u548cepoll\u3002\u4f46\u662f\u5bf9\u4e8e\u540e\u4e24\u8005\uff0c\u5728\u5e94\u7528\u65f6\u90fd\u4f1a\u6709\u660e\u786e\u7684\u53c2\u6570\u6765\u8bbe\u7f6e\u6d88\u606f\u89e6\u53d1\u7c7b\u578b\uff0c\u552f\u72ecselect\u6ca1\u6709\u8fd9\u79cd\u53ef\u9009\u7684\u8bbe\u7f6e\uff0c\u90a3\u4e48select\u7a76\u7adf\u5c5e\u4e8e\u54ea\u79cd\u89e6\u53d1\u5f62\u5f0f\uff0c\u4e0d\u59a8\u505a\u4e2a\u5b9e\u9a8c\u3002<\/span>\n<\/p>\n

\n\t    \u5b9e\u9a8c\u7684\u57fa\u672c\u601d\u8def\u5c31\u662f\uff0cserver\u901a\u8fc7select\u6a21\u578b\u6765\u76d1\u542c\u4e8b\u4ef6\uff0c\u82e5\u6709\u4e8b\u4ef6\u53d1\u751f\uff0c\u5219\u4e00\u6b21\u53ea\u63a5\u6536\u4e00\u4e2a\u5b57\u8282\u7684\u6570\u636e\uff0c\u800cclient\u4f1a\u4e00\u6b21\u6027\u7684\u5411server\u53d1\u9001\u5927\u4e8e1\u5b57\u8282\u7684\u62a5\u6587\uff0c\u82e5server\u4e0d\u65ad\u7684\u89e6\u53d1\u4e86select\u7684\u6d88\u606f\u901a\u77e5\uff0c\u5219\u4f1a\u5c06client\u53d1\u9001\u6765\u7684\u6240\u6709\u6570\u636e\u5168\u90e8\u63a5\u6536\uff0c\u4f46\u82e5server\u53ea\u89e6\u53d1\u4e86\u4e00\u6b21\u6d88\u606f\uff0c\u5219\u4e0d\u4f1a\u5c06\u5b8c\u6574\u7684\u6570\u636e\u590d\u5236\u5230\u7528\u6237\u5185\u5b58\u4e2d\uff0c\u7531\u6b64\u5c31\u53ef\u5224\u65adselect\u7684\u6d88\u606f\u89e6\u53d1\u7c7b\u578b\u3002<\/span>\n<\/p>\n

\n\t    <\/span>\n<\/p>\n

\n\t\u4e0b\u9762\u7ed9\u51fa\u5b9e\u9a8c\u4ee3\u7801\uff1a<\/span>\n<\/p>\n

\n\t\/\/Server<\/span>\n<\/p>\n

\n\t#include <stdio.h><\/span>
\n#include <stdlib.h><\/span>
\n#include <string.h><\/span>
\n#include <sys\/socket.h><\/span>
\n#include <sys\/types.h><\/span>
\n#include <sys\/select.h><\/span>
\n#include <time.h><\/span>
\n#include <arpa\/inet.h><\/span><\/p>\n

int main()<\/span>
\n{<\/span>
\n    struct sockaddr_in localAddr;<\/span>
\n    struct sockaddr_in clientAddr;<\/span>
\n    struct timeval timeo;<\/span>
\n    int listenSoc;<\/span>
\n    int clientSoc;<\/span>
\n    int addrLen;<\/span>
\n    fd_set fdRead;<\/span>
\n    char recvBuff[100];<\/span><\/p>\n

    memset(&localAddr,NULL,sizeof(localAddr));<\/span>
\n    memset(&clientAddr,NULL,sizeof(clientAddr));<\/span>
\n    memset(&timeo,NULL,sizeof(timeo));<\/span><\/p>\n

    timeo.tv_sec=1;<\/span><\/p>\n

    localAddr.sin_addr.s_addr=INADDR_ANY;<\/span>
\n    localAddr.sin_port=htons(7777);<\/span>
\n    localAddr.sin_family=AF_INET;<\/span><\/p>\n

    listenSoc=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);<\/span>
\n    if(listenSoc==-1)<\/span>
\n    {<\/span>
\n        printf(“create socket failed.\\n”);<\/span>
\n        return -1;<\/span>
\n    }<\/span><\/p>\n

    if(bind(listenSoc,(struct sockaddr *)&localAddr,sizeof(localAddr))!=0)<\/span>
\n    {<\/span>
\n        printf(“bind addr failed.\\n”);<\/span>
\n        return -1;<\/span>
\n    }<\/span><\/p>\n

    if(listen(listenSoc,SOMAXCONN)!=0)<\/span>
\n    {<\/span>
\n        printf(“listen socket failed.\\n”);<\/span>
\n        return -1;<\/span>
\n    }<\/span><\/p>\n

    addrLen=sizeof(clientAddr);<\/span>
\n    clientSoc=accept(listenSoc,(struct sockaddr *)&clientAddr,&addrLen);<\/span>
\n    if(clientSoc==-1)<\/span>
\n    {<\/span>
\n        printf(“accept conn failed.\\n”);<\/span>
\n        return -1;<\/span>
\n    }<\/span><\/p>\n

    while(1)<\/span>
\n    {<\/span>
\n        FD_ZERO(&fdRead);<\/span>
\n        FD_SET(clientSoc,&fdRead);<\/span><\/p>\n

        if(select(clientSoc+1,&fdRead,NULL,NULL,&timeo)<=0)<\/span>
\n            continue;<\/span>
\n        if(FD_ISSET(clientSoc,&fdRead))<\/span>
\n        {<\/span>
\n            memset(recvBuff,NULL,sizeof(recvBuff));<\/span>
\n            if(recv(clientSoc,recvBuff,1,0)<=0)<\/span>
\n            {<\/span>
\n                printf(“close conn.\\n”);<\/span>
\n                return 0;<\/span>
\n            }<\/span>
\n            printf(“%s”,recvBuff);<\/span>
\n        }<\/span>
\n    }<\/span><\/p>\n

    return 0;<\/span>
\n}<\/span><\/p>\n

\n\/\/Client<\/span>\n<\/p>\n

\n\t#include <stdio.h><\/span>
\n#include <stdlib.h><\/span>
\n#include <string.h><\/span>
\n#include <sys\/socket.h><\/span>
\n#include <sys\/types.h><\/span>
\n#include <arpa\/inet.h><\/span><\/p>\n

int main()<\/span>
\n{<\/span>
\n    struct sockaddr_in servAddr;<\/span>
\n    int servSoc;<\/span>
\n    char *sendStr=”Hello,I’m client.\\n”;<\/span><\/p>\n

    memset(&servAddr,NULL,sizeof(servAddr));<\/span><\/p>\n

    servAddr.sin_addr.s_addr=inet_addr(“127.0.0.1”);<\/span>
\n    servAddr.sin_port=htons(7777);<\/span>
\n    servAddr.sin_family=AF_INET;<\/span><\/p>\n

    servSoc=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);<\/span>
\n    if(servSoc==-1)<\/span>
\n    {<\/span>
\n        printf(“create socket failed.\\n”);<\/span>
\n        return -1;<\/span>
\n    }<\/span><\/p>\n

    if(connect(servSoc,(struct sockaddr *)&servAddr,sizeof(servAddr))!=0)<\/span>
\n    {<\/span>
\n        printf(“conn failed.\\n”);<\/span>
\n        return -1;<\/span>
\n    }<\/span><\/p>\n

    if(send(servSoc,sendStr,strlen(sendStr),0)<=0)<\/span>
\n    {<\/span>
\n        printf(“send failed.\\n”);<\/span>
\n        return -1;<\/span>
\n    }<\/span><\/p>\n

    return 0;<\/span>
\n}<\/span><\/p>\n

\n\u5b9e\u9a8c\u7ed3\u679c\uff1a<\/span>\n<\/p>\n

\n\t\"20160410010643.jpg\"<\/a>\n<\/p>\n

\n\t\n<\/p>\n

\n\t\u7531\u6b64\u53ef\u5f97\uff0cselect\u6a21\u578b\u7684\u6d88\u606f\u89e6\u53d1\u5f62\u5f0f\u4e3a\u6c34\u5e73\u89e6\u53d1\u3002<\/span>
\n<\/span>\n<\/p>\n

\n\t<\/p>\n","protected":false},"excerpt":{"rendered":"

\n\t    \u5728I\/O\u591a\u8def\u590d\u7528\u4e2d\uff0c\u6d88\u606f\u6709\u4e24\u79cd\u4e0d\u540c\u7684\u89e6\u53d1\u65b9\u5f0f\uff0c\u5206\u522b\u662f\uff1a<\/span>\n<\/p>\n

\n\t    \u6c34\u5e73\u89e6\u53d1(level-triggered\uff0c\u4e5f\u88ab\u79f0\u4e3a\u6761\u4ef6\u89e6\u53d1)LT:  \u53ea\u8981\u6ee1\u8db3\u6761\u4ef6\uff0c\u5c31\u89e6\u53d1\u4e00\u4e2a\u4e8b\u4ef6(\u53ea\u8981\u6709\u6570\u636e\u6ca1\u6709\u88ab\u83b7\u53d6\uff0c\u5185\u6838\u5c31\u4e0d\u65ad\u901a\u77e5\u4f60) \u3002<\/span>\n<\/p>\n

\n\t    \u8fb9\u7f18\u89e6\u53d1(edge-triggered)ET: \u6bcf\u5f53\u72b6\u6001\u53d8\u5316\u65f6\uff0c\u89e6\u53d1…<\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[324],"tags":[],"class_list":["post-176","post","type-post","status-publish","format-standard","hentry"],"yoast_head":"\nI\/O\u591a\u8def\u590d\u7528\u4e2dselect\u6a21\u578b\u7684\u6d88\u606f\u89e6\u53d1\u5f62\u5f0f - Wayne's Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/weizn.net\/?p=176\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"I\/O\u591a\u8def\u590d\u7528\u4e2dselect\u6a21\u578b\u7684\u6d88\u606f\u89e6\u53d1\u5f62\u5f0f - Wayne's Blog\" \/>\n<meta property=\"og:description\" content=\"    \u5728I\/O\u591a\u8def\u590d\u7528\u4e2d\uff0c\u6d88\u606f\u6709\u4e24\u79cd\u4e0d\u540c\u7684\u89e6\u53d1\u65b9\u5f0f\uff0c\u5206\u522b\u662f\uff1a     \u6c34\u5e73\u89e6\u53d1(level-triggered\uff0c\u4e5f\u88ab\u79f0\u4e3a\u6761\u4ef6\u89e6\u53d1)LT:  \u53ea\u8981\u6ee1\u8db3\u6761\u4ef6\uff0c\u5c31\u89e6\u53d1\u4e00\u4e2a\u4e8b\u4ef6(\u53ea\u8981\u6709\u6570\u636e\u6ca1\u6709\u88ab\u83b7\u53d6\uff0c\u5185\u6838\u5c31\u4e0d\u65ad\u901a\u77e5\u4f60) \u3002     \u8fb9\u7f18\u89e6\u53d1(edge-triggered)ET: \u6bcf\u5f53\u72b6\u6001\u53d8\u5316\u65f6\uff0c\u89e6\u53d1...\" \/>\n<meta property=\"og:url\" content=\"http:\/\/weizn.net\/?p=176\" \/>\n<meta property=\"og:site_name\" content=\"Wayne's Blog\" \/>\n<meta property=\"article:published_time\" content=\"2016-04-09T17:46:16+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.weizn.net\/content\/uploadfile\/201604\/2b671460221074.jpg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"zinan\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"http:\/\/weizn.net\/#website\",\"url\":\"http:\/\/weizn.net\/\",\"name\":\"Wayne's Blog\",\"description\":\"\",\"publisher\":{\"@id\":\"http:\/\/weizn.net\/#\/schema\/person\/e88bc12c590502d8b6249326f960b264\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"http:\/\/weizn.net\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"ImageObject\",\"@id\":\"http:\/\/weizn.net\/?p=176#primaryimage\",\"inLanguage\":\"zh-Hans\",\"url\":\"http:\/\/www.weizn.net\/content\/uploadfile\/201604\/2b671460221074.jpg\",\"contentUrl\":\"http:\/\/www.weizn.net\/content\/uploadfile\/201604\/2b671460221074.jpg\"},{\"@type\":\"WebPage\",\"@id\":\"http:\/\/weizn.net\/?p=176#webpage\",\"url\":\"http:\/\/weizn.net\/?p=176\",\"name\":\"I\/O\\u591a\\u8def\\u590d\\u7528\\u4e2dselect\\u6a21\\u578b\\u7684\\u6d88\\u606f\\u89e6\\u53d1\\u5f62\\u5f0f - 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