{"id":3503,"date":"2017-08-06T08:34:15","date_gmt":"2017-08-06T00:34:15","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=3503"},"modified":"2017-08-06T08:34:15","modified_gmt":"2017-08-06T00:34:15","slug":"linux%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b%e6%9c%8d%e5%8a%a1%e5%99%a8%e6%a8%a1%e5%9e%8b%e4%b9%8b%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/3503.html","title":{"rendered":"Linux\u7f51\u7edc\u7f16\u7a0b\u670d\u52a1\u5668\u6a21\u578b\u4e4b\u5e76\u53d1\u670d\u52a1\u5668"},"content":{"rendered":"<p>=Start=<\/p>\n<h4 id=\"id-\u6a21\u677f-\u7f18\u7531\uff1a\">\u7f18\u7531\uff1a<\/h4>\n<p>\u5b66\u4e60\u9700\u8981<\/p>\n<h4 id=\"id-\u6a21\u677f-\u6b63\u6587\uff1a\">\u6b63\u6587\uff1a<\/h4>\n<h5 id=\"id-\u6a21\u677f-\u53c2\u8003\u89e3\u7b54\uff1a\">\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n<pre class=\"lang:default decode:true \">\/*\r\nLinux\u7f51\u7edc\u7f16\u7a0b\u670d\u52a1\u5668\u6a21\u578b\u9009\u62e9\u4e4b\u5e76\u53d1\u670d\u52a1\u5668\uff08\u4e0a\uff09\r\nhttp:\/\/www.cnblogs.com\/lizhenghn\/p\/3617666.html\r\n*\/\r\n#include &lt;sys\/types.h&gt;\r\n#include &lt;sys\/socket.h&gt;\r\n#include &lt;netinet\/in.h&gt;\r\n#include &lt;time.h&gt;\r\n#include &lt;string.h&gt;\r\n#include &lt;stdio.h&gt;\r\n\r\n#define BUFFLEN 1024\r\n#define SERVER_PORT 12347\r\n#define BACKLOG 5\r\n\r\nstatic void handle_request(int s_c)\r\n{\r\n    time_t now;        \r\n    char buff[BUFFLEN];\r\n    int n = 0;\r\n    memset(buff, 0, BUFFLEN);\r\n    n = recv(s_c, buff, BUFFLEN, 0); \/*\u63a5\u6536\u53d1\u9001\u65b9\u6570\u636e*\/\r\n    if(n &gt; 0 &amp;&amp; !strncmp(buff, \"TIME\", 4)) \/*\u5224\u65ad\u662f\u5426\u5408\u6cd5\u63a5\u6536\u6570\u636e*\/\r\n    {\r\n        memset(buff, 0, BUFFLEN);\r\n        now = time(NULL);\r\n        sprintf(buff, \"%24s\\r\\n\",ctime(&amp;now));\r\n        send(s_c, buff, strlen(buff),0); \/*\u53d1\u9001\u6570\u636e*\/\r\n    }        \r\n    \r\n    close(s_c); \/*\u5173\u95ed\u5ba2\u6237\u7aef*\/\r\n}\r\n\r\nstatic void handle_connect(int s_s)\r\n{    \r\n    int s_c;    \/*\u5ba2\u6237\u7aef\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26*\/\r\n    struct sockaddr_in from;    \/*\u5ba2\u6237\u7aef\u5730\u5740*\/\r\n    int len = sizeof(from);\r\n    \r\n    \/*\u4e3b\u5904\u7406\u8fc7\u7a0b*\/\r\n    while(1)\r\n    {\r\n        \/*\u63a5\u6536\u5ba2\u6237\u7aef\u8fde\u63a5*\/\r\n        s_c = accept(s_s, (struct sockaddr*)&amp;from, &amp;len);\r\n        if(s_c &gt; 0)\/*\u5ba2\u6237\u7aef\u6210\u529f\u8fde\u63a5*\/\r\n        {\r\n            \/*\u521b\u5efa\u8fdb\u7a0b\u8fdb\u884c\u6570\u636e\u5904\u7406*\/\r\n            if(fork() &gt; 0)\/*\u7236\u8fdb\u7a0b*\/\r\n            {\r\n                \/\/ printf(\"Remote IP:Port is '%s:%d'\\n\", inet_ntoa(from.sin_addr), (int)ntohs(from.sin_port)); \/\/ Segmentation fault (why?)\r\n                close(s_c);\/*\u5173\u95ed\u7236\u8fdb\u7a0b\u7684\u5ba2\u6237\u7aef\u8fde\u63a5\u5957\u63a5\u5b57*\/\r\n            }\r\n            else\r\n            {\r\n                handle_request(s_c);\/*\u5904\u7406\u8fde\u63a5\u8bf7\u6c42*\/\r\n                \/\/ printf(\"Remote IP:Port is '%s:%d'\\n\", inet_ntoa(from.sin_addr), (int)ntohs(from.sin_port)); \/\/ Nothing happens (why?)\r\n                return ;    \r\n            }\r\n        }\r\n    }        \r\n}\r\n\r\n\r\nint main(int argc, char *argv[])\r\n{\r\n    int s_s; \/*\u670d\u52a1\u5668\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26*\/\r\n    struct sockaddr_in local; \/*\u672c\u5730\u5730\u5740*\/    \r\n    \r\n    \/*\u5efa\u7acbTCP\u5957\u63a5\u5b57*\/\r\n    s_s = socket(AF_INET, SOCK_STREAM, 0);\r\n    \r\n    \/*\u521d\u59cb\u5316\u5730\u5740*\/\r\n    memset(&amp;local, 0, sizeof(local));\r\n    local.sin_family = AF_INET;\/*AF_INET\u534f\u8bae\u65cf*\/\r\n    local.sin_addr.s_addr = htonl(INADDR_ANY);\/*\u4efb\u610f\u672c\u5730\u5730\u5740*\/\r\n    local.sin_port = htons(SERVER_PORT);\/*\u670d\u52a1\u5668\u7aef\u53e3*\/\r\n    \r\n    int err;\r\n    \/*\u5c06\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26\u7ed1\u5b9a\u5230\u672c\u5730\u5730\u5740\u548c\u7aef\u53e3*\/\r\n    err = bind(s_s, (struct sockaddr*)&amp;local, sizeof(local));\r\n    err = listen(s_s, BACKLOG);\/*\u4fa6\u542c*\/\r\n    \r\n    \/*\u5904\u7406\u5ba2\u6237\u7aef\u8fde\u63a5*\/\r\n    handle_connect(s_s);\r\n    \r\n    close(s_s);\r\n    \r\n    return 0;        \r\n}<\/pre>\n<p>&amp;<\/p>\n<pre class=\"lang:default decode:true\">\/*\r\nLinux\u7f51\u7edc\u7f16\u7a0b\u670d\u52a1\u5668\u6a21\u578b\u9009\u62e9\u4e4bIO\u590d\u7528\u5faa\u73af\u5e76\u53d1\u670d\u52a1\u5668\r\nhttp:\/\/www.cnblogs.com\/lizhenghn\/p\/3619091.html\r\n\r\nhttp:\/\/man7.org\/linux\/man-pages\/man3\/pthread_create.3.html\r\nhttp:\/\/man7.org\/linux\/man-pages\/man2\/socket.2.html\r\nhttp:\/\/man7.org\/linux\/man-pages\/man2\/bind.2.html\r\nhttp:\/\/man7.org\/linux\/man-pages\/man2\/listen.2.html\r\nhttp:\/\/man7.org\/linux\/man-pages\/man2\/select.2.html\r\n*\/\r\n#include &lt;sys\/types.h&gt;\r\n#include &lt;sys\/socket.h&gt;\r\n#include &lt;netinet\/in.h&gt;\r\n#include &lt;time.h&gt;\r\n#include &lt;string.h&gt;\r\n#include &lt;stdio.h&gt;\r\n#include &lt;pthread.h&gt;\r\n#include &lt;sys\/select.h&gt;\r\n\r\n#define BUFFLEN 1024\r\n#define SERVER_PORT 12349\r\n#define BACKLOG 5 \/*\u6302\u8d77\u961f\u5217\u7684\u6700\u5927\u957f\u5ea6*\/\r\n#define CLIENTNUM 1024 \/*\u6700\u5927\u652f\u6301\u5ba2\u6237\u7aef\u6570\u91cf*\/\r\n\r\n\/\/ \u5168\u5c40\u53d8\u91cf\r\nint connect_host[CLIENTNUM]; \/*\u53ef\u8fde\u63a5\u5ba2\u6237\u7aef\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u7ec4*\/\r\nint connect_number = 0;\r\n\r\nstatic void *handle_request(void *argv)\r\n{\r\n    time_t now; \/*\u65f6\u95f4*\/\r\n    char buff[BUFFLEN]; \/*\u6536\u53d1\u6570\u636e\u7f13\u51b2\u533a*\/\r\n\r\n    fd_set scanfd; \/*\u4fa6\u542c\u63cf\u8ff0\u7b26\u96c6\u5408*\/\r\n\r\n    struct timeval timeout; \/*\u8d85\u65f6*\/\r\n    timeout.tv_sec = 1; \/*\u963b\u585e1\u79d2\u540e\u8d85\u65f6\u8fd4\u56de*\/\r\n    timeout.tv_usec = 0;\r\n\r\n    int i = 0;\r\n    int maxfd = -1; \/*\u6700\u5927\u4fa6\u542c\u6587\u4ef6\u63cf\u8ff0\u7b26*\/\r\n    int err = -1;\r\n    int n = 0;\r\n    for(;;)\r\n    {\r\n        \/*\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26\u503c\u521d\u59cb\u5316\u4e3a-1*\/\r\n        maxfd = -1;\r\n        FD_ZERO(&amp;scanfd); \/*\u6e05\u96f6\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408*\/\r\n        for(i=0; i&lt;CLIENTNUM; i++) \/*\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u653e\u5165\u96c6\u5408*\/\r\n        {\r\n            if(connect_host[i] != -1)\/*\u5408\u6cd5\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26*\/\r\n            {\r\n                FD_SET(connect_host[i], &amp;scanfd); \/*\u653e\u5165\u96c6\u5408*\/\r\n                if(maxfd &lt; connect_host[i]) \/*\u66f4\u65b0\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26\u503c*\/\r\n                {\r\n                    maxfd = connect_host[i];\r\n                }\r\n            }\r\n        }\r\n        \r\n        err = select(maxfd + 1, &amp;scanfd, NULL, NULL, &amp;timeout); \/*select\u7b49\u5f85*\/\r\n        switch(err)\r\n        {\r\n            case 0: \/*\u8d85\u65f6*\/\r\n                break;\r\n            case -1: \/*\u9519\u8bef\u53d1\u751f*\/\r\n                break;\r\n            default: \/*\u6709\u53ef\u8bfb\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26*\/\r\n                if(connect_number &lt;= 0)\r\n                    break;\r\n                for(i = 0; i&lt;CLIENTNUM; i++)\r\n                {\r\n                    \/*\u67e5\u627e\u6fc0\u6d3b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26*\/\r\n                    if(connect_host[i] != -1 &amp;&amp; FD_ISSET(connect_host[i], &amp;scanfd))\r\n                    {\r\n                        memset(buff, 0, BUFFLEN); \/*\u6e05\u96f6*\/\r\n                        n = recv(connect_host[i], buff, BUFFLEN, 0); \/*\u63a5\u6536\u53d1\u9001\u65b9\u6570\u636e*\/\r\n                        if(n &gt; 0 &amp;&amp; !strncmp(buff, \"TIME\", 4))\/*\u5224\u65ad\u662f\u5426\u5408\u6cd5\u63a5\u6536\u6570\u636e*\/\r\n                        {\r\n                            memset(buff, 0, BUFFLEN); \/*\u6e05\u96f6*\/\r\n                            now = time(NULL); \/*\u5f53\u524d\u65f6\u95f4*\/\r\n                            sprintf(buff, \"%24s\\r\\n\", ctime(&amp;now)); \/*\u5c06\u65f6\u95f4\u62f7\u8d1d\u5165\u7f13\u51b2\u533a*\/\r\n                            send(connect_host[i], buff, strlen(buff), 0); \/*\u53d1\u9001\u6570\u636e*\/\r\n                        }\r\n                        \/*\u5173\u95ed\u5ba2\u6237\u7aef*\/\r\n                        close(connect_host[i]);\r\n                        \r\n                        connect_host[i] = -1; \/*\u66f4\u65b0\u6587\u4ef6\u63cf\u8ff0\u7b26\u5728\u6570\u7ec4\u4e2d\u7684\u503c*\/\r\n                        connect_number--; \/*\u5ba2\u6237\u7aef\u8ba1\u6570\u5668\u51cf1*\/\r\n                    }\r\n                }\r\n                break;\r\n        }\r\n    }\r\n\r\n    return NULL;\r\n}\r\n\r\nstatic void *handle_connect(void *argv)\r\n{\r\n    int sock_fd = *((int*)argv); \/*\u83b7\u5f97\u670d\u52a1\u5668\u4fa6\u542c\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26*\/\r\n    int s_c = -1; \/*\u8fde\u63a5\u5ba2\u6237\u7aef\u6587\u4ef6\u63cf\u8ff0\u7b26*\/\r\n    struct sockaddr_in from;\r\n    int len = sizeof(from);\r\n    \r\n    \/*\u63a5\u6536\u5ba2\u6237\u7aef\u8fde\u63a5*\/\r\n    for(;;)\r\n    {\r\n        int i = 0;\r\n        s_c = accept(sock_fd, (struct sockaddr *)&amp;from, &amp;len); \/*\u63a5\u6536\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42*\/\r\n        \/\/ printf(\"a client connect, from:%s\\n\", inet_ntoa(from.sin_addr)); \/\/ Segmentation fault (why?)\r\n        \/*\u67e5\u627e\u5408\u9002\u4f4d\u7f6e\uff0c\u5c06\u5ba2\u6237\u7aef\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u653e\u5165*\/\r\n        for(i=0; i&lt;CLIENTNUM; i++)\r\n        {\r\n            if(connect_host[i] == -1)\/*\u627e\u5230*\/\r\n            {\r\n                connect_host[i]= s_c; \/*\u653e\u5165*\/\r\n\r\n                connect_number++; \/*\u5ba2\u6237\u7aef\u8ba1\u6570\u5668\u52a01*\/\r\n                \r\n                break; \/*\u7ee7\u7eed\u8f6e\u8be2\u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5*\/\r\n            }\r\n        }\r\n    }\r\n    return NULL;\r\n}\r\n\r\nint main(int argc, char *argv[])\r\n{\r\n    memset(connect_host, -1, CLIENTNUM);\r\n\r\n    int sock_fd; \/*\u670d\u52a1\u5668\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26*\/\r\n    sock_fd = socket(AF_INET, SOCK_STREAM, 0); \/*\u5efa\u7acbTCP\u5957\u63a5\u5b57*\/\r\n\r\n    struct sockaddr_in local; \/*\u672c\u5730\u5730\u5740*\/\r\n    \/*\u521d\u59cb\u5316\u5730\u5740\u8fde\u63a5\u4fe1\u606f*\/\r\n    memset(&amp;local, 0, sizeof(local)); \/*\u6e05\u96f6*\/\r\n    local.sin_family = AF_INET; \/*AF_INET\u534f\u8bae\u65cf*\/\r\n    local.sin_addr.s_addr = htonl(INADDR_ANY); \/*\u4efb\u610f\u672c\u5730\u5730\u5740*\/\r\n    local.sin_port = htons(SERVER_PORT); \/*\u670d\u52a1\u5668\u7aef\u53e3*\/\r\n\r\n    int err;\r\n    err = bind(sock_fd, (struct sockaddr *)&amp;local, sizeof(local)); \/*\u5c06\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26\u7ed1\u5b9a\u5230\u672c\u5730\u5730\u5740\u548c\u7aef\u53e3*\/\r\n    \/\/ if(err == -1) perror(\"bind() error\");\r\n\r\n    err = listen(sock_fd, BACKLOG); \/*\u5c06 sock_fd \u8bbe\u7f6e\u4e3a\u76d1\u542c\u6a21\u5f0f\uff0c\u53c2\u6570 BACKLOG \u5b9a\u4e49\u6302\u8d77\u961f\u5217\u7684\u6700\u5927\u957f\u5ea6*\/\r\n    \/\/ if(err == -1) perror(\"listen() error\");\r\n\r\n    pthread_t thread_do[2]; \/*\u7ebf\u7a0bID*\/\r\n\r\n    \/*\u521b\u5efa\u7ebf\u7a0b\u5904\u7406\u5ba2\u6237\u7aef\u8fde\u63a5*\/\r\n    pthread_create(&amp;thread_do[0], \/*\u7ebf\u7a0bID*\/\r\n                    NULL, \/*\u5c5e\u6027*\/\r\n                    handle_connect, \/*\u7ebf\u7a0b\u56de\u8c03\u51fd\u6570*\/\r\n                    (void*)&amp;sock_fd); \/*\u4f20\u9012\u7ed9\u7ebf\u7a0b\u56de\u8c03\u51fd\u6570\u7684\u552f\u4e00\u7ebf\u7a0b\u53c2\u6570*\/\r\n\r\n    \/*\u521b\u5efa\u7ebf\u7a0b\u5904\u7406\u5ba2\u6237\u7aef\u8bf7\u6c42*\/\r\n    pthread_create(&amp;thread_do[1], \/*\u7ebf\u7a0bID*\/\r\n                    NULL, \/*\u5c5e\u6027*\/\r\n                    handle_request, \/*\u7ebf\u7a0b\u56de\u8c03\u51fd\u6570*\/\r\n                    NULL); \/*\u4f20\u9012\u7ed9\u7ebf\u7a0b\u56de\u8c03\u51fd\u6570\u7684\u552f\u4e00\u7ebf\u7a0b\u53c2\u6570*\/\r\n    int i = 0;\r\n    for(i=0; i&lt;2; i++)\r\n        pthread_join(thread_do[i], NULL); \/*\u7b49\u5f85\u7ebf\u7a0b\u7ed3\u675f*\/\r\n\r\n    close(sock_fd);\r\n\r\n    return 0;\r\n}<\/pre>\n<h5 id=\"id-\u6a21\u677f-\u53c2\u8003\u94fe\u63a5\uff1a\">\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n<p>Linux\u7f51\u7edc\u7f16\u7a0b\u670d\u52a1\u5668\u6a21\u578b\u9009\u62e9\u4e4b\u5e76\u53d1\u670d\u52a1\u5668\uff08\u4e0a\uff09<br \/>\n<a href=\"http:\/\/www.cnblogs.com\/lizhenghn\/p\/3617666.html\">http:\/\/www.cnblogs.com\/lizhenghn\/p\/3617666.html<\/a><\/p>\n<p>Linux\u7f51\u7edc\u7f16\u7a0b\u670d\u52a1\u5668\u6a21\u578b\u9009\u62e9\u4e4bIO\u590d\u7528\u5faa\u73af\u5e76\u53d1\u670d\u52a1\u5668<br \/>\n<a href=\"http:\/\/www.cnblogs.com\/lizhenghn\/p\/3619091.html\">http:\/\/www.cnblogs.com\/lizhenghn\/p\/3619091.html<\/a><\/p>\n<p><a href=\"http:\/\/man7.org\/linux\/man-pages\/man3\/pthread_create.3.html\">http:\/\/man7.org\/linux\/man-pages\/man3\/pthread_create.3.html<\/a><br \/>\n<a href=\"http:\/\/man7.org\/linux\/man-pages\/man2\/socket.2.html\">http:\/\/man7.org\/linux\/man-pages\/man2\/socket.2.html<\/a><br \/>\n<a href=\"http:\/\/man7.org\/linux\/man-pages\/man2\/bind.2.html\">http:\/\/man7.org\/linux\/man-pages\/man2\/bind.2.html<\/a><br \/>\n<a href=\"http:\/\/man7.org\/linux\/man-pages\/man2\/listen.2.html\">http:\/\/man7.org\/linux\/man-pages\/man2\/listen.2.html<\/a><br \/>\n<a href=\"http:\/\/man7.org\/linux\/man-pages\/man2\/select.2.html\">http:\/\/man7.org\/linux\/man-pages\/man2\/select.2.html<\/a><\/p>\n<p>=END=<\/p>\n","protected":false},"excerpt":{"rendered":"<p>=Start= \u7f18\u7531\uff1a \u5b66\u4e60\u9700\u8981 \u6b63\u6587\uff1a \u53c2\u8003\u89e3\u7b54\uff1a \/* Linux\u7f51\u7edc\u7f16\u7a0b\u670d\u52a1\u5668\u6a21\u578b\u9009\u62e9\u4e4b\u5e76\u53d1\u670d\u52a1\u5668\uff08\u4e0a\uff09 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,11,7],"tags":[100,902,30,901],"class_list":["post-3503","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-linux","category-programing","tag-c","tag-io","tag-linux","tag-901"],"views":4478,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3503","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=3503"}],"version-history":[{"count":1,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3503\/revisions"}],"predecessor-version":[{"id":3504,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3503\/revisions\/3504"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=3503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=3503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=3503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}