📄 1021.html
字号:
{<br>
fork()<br>
子进程：<br>
{<br>
读出当前时间；<br>
将当前时间写入通信文件描述符；<br>
关闭通信文件描述符；<br>
}<br>
父进程：<br>
关闭通信文件描述符；<br>
}<br>
*/<br>
<br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
<br>
int main(int argc,char *argv[])<br>
{<br>
int listenfd,communfd;<br>
struct sockaddr_in servaddr;<br>
pid_t childpid;<br>
time_t tick;<br>
char buf[1024];<br>
<br>
if((listenfd=socket(AF_INET,SOCK_STREAM,0))==-1)<br>
{<br>
perror("Could not create socket");<br>
exit(1);<br>
}<br>
<br>
servaddr.sin_family=AF_INET;<br>
servaddr.sin_addr.s_addr=INADDR_ANY; <br>
servaddr.sin_port=htons(13);<br>
if(bind(listenfd,(struct sockaddr *)&servaddr,sizeof(servaddr))==-1)<br>
{<br>
perror("bind error");<br>
exit(1);<br>
}<br>
if(listen(listenfd,254)==-1)<br>
{<br>
perror("listen error");<br>
exit(1);<br>
}<br>
while(communfd=accept(listenfd,(struct sockaddr*)NULL,NULL))<br>
{<br>
if((childpid=fork())==-1)<br>
{<br>
perror("fork error");<br>
exit(1);<br>
}<br>
else if(childpid==0)<br>
{<br>
tick=time(NULL);<br>
snprintf(buf,sizeof(buf),"%.24s
",ctime(&tick));<br>
write(communfd,buf,strlen(buf));<br>
close(communfd);<br>
}<br>
else if(childpid>0)<br>
close(communfd); <br>
<br>
}<br>
exit(0);<br>
}<br>
<br>
<br>
/*timeclient.h*/<br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
#include <br>
<br>
int main(int argc,char *argv[])<br>
{<br>
int communfd,n;<br>
struct sockaddr_in servaddr;<br>
char recieve[1024],buf[1024];<br>
<br>
if(argc!=2)<br>
{<br>
perror("Usage: client ");<br>
exit(1);<br>
}<br>
if((communfd=socket(AF_INET,SOCK_STREAM,0))==-1)<br>
{<br>
perror("socket error");<br>
exit(1);<br>
}<br>
servaddr.sin_family=AF_INET;<br>
servaddr.sin_port=htons(13);<br>
if((servaddr.sin_addr.s_addr=inet_addr(argv[1]))==INADDR_NONE)<br>
{<br>
perror("inet_addr error");<br>
exit(1);<br>
}<br>
if(connect(communfd,(struct sockaddr*)&servaddr,sizeof(servaddr))==-1)<br>
{<br>
perror("connect error");<br>
exit(1);<br>
}<br>
while((n=read(communfd,recieve,1024))>0)<br>
{<br>
recieve[n]=0;<br>
if(fputs(recieve,stdout)==EOF)<br>
perror("fputs error");<br>
}<br>
close(communfd);<br>
exit(0);<br>
}<br>
<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）：<br>
server &<br>
然后运行客户机程序（设服务器网络地址为192.168.0.1）：<br>
client 192.168.0.1<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）。<br>
<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。<br>
<br>
dexin<br>
lzdx@163.net<br>
http://lzdx.yeah.net
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