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📄 如何编写linux下的客户机-服务器软件-xxlinux_com2.htm

📁 如何编写linux的客户端与服务器的教程,简单实用
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            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR><SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>int main(int argc,char 
            *argv[])<SPAN style="DISPLAY: none">it6Linux联盟</SPAN><BR>{<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>int 
            listenfd,communfd;<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>struct sockaddr_in 
            servaddr;<SPAN style="DISPLAY: none">it6Linux联盟</SPAN><BR>pid_t 
            childpid;<SPAN style="DISPLAY: none">it6Linux联盟</SPAN><BR>time_t 
            tick;<SPAN style="DISPLAY: none">it6Linux联盟</SPAN><BR>char 
            buf[1024];<SPAN style="DISPLAY: none">it6Linux联盟</SPAN><BR><SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>if((listenfd=socket(AF_INET,SOCK_STREAM,0))==-1)<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>{<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>perror("Could not create 
            socket");<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>exit(1);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>}<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR><SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>servaddr.sin_family=AF_INET;<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>servaddr.sin_addr.s_addr=INADDR_ANY; 
            <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>servaddr.sin_port=htons(13);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>if(bind(listenfd,(struct 
            sockaddr *)&amp;servaddr,sizeof(servaddr))==-1)<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>{<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>perror("bind 
            error");<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>exit(1);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>}<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>if(listen(listenfd,254)==-1)<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>{<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>perror("listen 
            error");<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>exit(1);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>}<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>while(communfd=accept(listenfd,(struct 
            sockaddr*)NULL,NULL))<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>{<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>if((childpid=fork())==-1)<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>{<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>perror("fork 
            error");<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>exit(1);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>}<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>else if(childpid==0)<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>{<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>tick=time(NULL);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>snprintf(buf,sizeof(buf),"%.24s<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>",ctime(&amp;tick));<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>write(communfd,buf,strlen(buf));<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>close(communfd);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>}<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>else 
            if(childpid&gt;0)<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>close(communfd); <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR><SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>}<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>exit(0);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>}<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR><SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR><SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>/*timeclient.h*/<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>#include <SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR><SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>int main(int argc,char 
            *argv[])<SPAN style="DISPLAY: none">it6Linux联盟</SPAN><BR>{<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>int communfd,n;<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>struct sockaddr_in 
            servaddr;<SPAN style="DISPLAY: none">it6Linux联盟</SPAN><BR>char 
            recieve[1024],buf[1024];<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR><SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>if(argc!=2)<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>{<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>perror("Usage: client 
            ");<SPAN style="DISPLAY: none">it6Linux联盟</SPAN><BR>exit(1);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>}<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>if((communfd=socket(AF_INET,SOCK_STREAM,0))==-1)<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>{<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>perror("socket 
            error");<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>exit(1);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>}<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>servaddr.sin_family=AF_INET;<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>servaddr.sin_port=htons(13);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>if((servaddr.sin_addr.s_addr=inet_addr(argv[1]))==INADDR_NONE)<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>{<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>perror("inet_addr 
            error");<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>exit(1);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>}<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>if(connect(communfd,(struct 
            sockaddr*)&amp;servaddr,sizeof(servaddr))==-1)<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>{<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>perror("connect 
            error");<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>exit(1);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>}<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>while((n=read(communfd,recieve,1024))&gt;0)<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>{<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>recieve[n]=0;<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>if(fputs(recieve,stdout)==EOF)<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>perror("fputs 
            error");<SPAN style="DISPLAY: none">it6Linux联盟</SPAN><BR>}<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>close(communfd);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>exit(0);<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>}<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR><SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>用gcc编译两个源程序分别取名为server和client，以根用户身份运行服务器程序（设服务器网络地址为192.168.0.1）：<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>server &amp;<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>然后运行客户机程序（设服务器网络地址为192.168.0.1）：<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>client 192.168.0.1<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>在客户机上就会反映出服务器上当前的时间如（Tue 
            Feb 29 21:46:19 2000）。<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR><SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR>以上程序代码在redhat 
            6.0上试验通过。在程序代码中有关库函数snprintf、fputs、read、write、close的用法就不在这里说明了，如想了解这些库函数的调用方法可到我的网页http://lzdx.yeah. 
            net/pro_unix.html去查找。在我的网页http://lzdx.yeah.net/pro_uici.html中有关于通用Internet接口（UICI）专用库的介绍，通用Internet接口（UICI）利用Socket库函数提供了一个简化的独立于传输的接口，它从整体上简化了网络程序设计过程。有兴趣的人可到那里去看看。最后祝愿我们每个人都能编写出自己的网络程序。<SPAN 
            style="DISPLAY: none">it6Linux联盟</SPAN><BR></FONT><A 
            href="http://www.xxlinux.com/">Linux联盟</A>收集整理 
            ,转贴请标明原始链接,如有任何疑问欢迎来本站<A 
            href="http://bbs.xxlinux.com/">Linux论坛</A>讨论</FONT></TD>
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