tcp 客戶 伺服器程式示例

1）client 從標準輸入讀入一行文字，並寫給伺服器。

2）伺服器從網路輸入讀入這行文字，並回射給客戶。

3）客戶從網路輸入讀入這行回射的文字，顯示在標準輸出上

標準輸入—–fgets—-> tcp 客戶—write——————-read–>tcp 伺服器

標準輸出<—-fputs—–tcp 客戶<—read——————-write—tcp 伺服器

client **

#include 

#include /* see notes */
#include 
#include 
#include 
#include 
void str_cli(file *fp, int sockfd)
fputs(recvline, stdout);
}}int main(int argc , char** argv)
if((sockfd = socket(af_inet, sock_stream, 0)) < 0)
bzero(&seraddr, sizeof(seraddr));
seraddr.sin_family = af_inet;
seraddr.sin_port = htons(13000);
if((inet_pton(af_inet, argv[1], &seraddr.sin_addr)) < 0)
if(connect(sockfd, (struct sockaddr*)&seraddr, sizeof(seraddr)) < 0)
str_cli(stdin, sockfd);
return
0;}

#include 

#include /* see notes */
#include 
#include 
#include 
#include 
#include 
#include 
void str_echo(int sockfd)
if(n < 0)
}int main(int argc, char** argv)
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = af_inet;
servaddr.sin_port = htons(13000);
servaddr.sin_addr.s_addr = inet_addr("0.0.0.0");
if( bind(listenfd, (struct sockaddr* )&servaddr, sizeof(servaddr)) < 0)
if(listen(listenfd, 0) < 0)
for( ; ;)
close(connectfd);
}}

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