本文共 1941 字，大约阅读时间需要 6 分钟。

0、基本流程

1. 代码分为clien和server

client：连接服务器server，并获取时间。

server：检测到client连接上来，获取当前时间，并传给client

2. 源码如下

client.c

#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          // #include "unpv13e/lib/unp.h"#define MAXLINE 4096 int main(int argc, char **argv){ int sockfd, n; char recvline[MAXLINE + 1]; struct sockaddr_in servaddr; if (argc != 2) { printf("usage: a.out 
          
           \n"); } if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { printf("socket error\n"); } bzero(&servaddr, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_port = htons(8888); /* daytime server */ if (inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0) { printf("inet_pton error for %s\n", argv[1]); goto done; } if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) { perror("connect error: "); goto done; } while((n = read(sockfd, recvline, MAXLINE)) > 0) { recvline[n] = 0; /* null terminate */ if(fputs(recvline, stdout) == EOF) { printf("fputs error\n"); } } if(n < 0) { printf("read error\n"); } done: exit(0);}
          
         
        
       
      
     
    
   

server.c

#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #include 
          
           #define MAXLINE 4096 #define LISTENQ 1024int main(int argc, char **argv){ int listenfd, connfd; struct sockaddr_in servaddr; char buff[MAXLINE]; time_t ticks; listenfd = socket(AF_INET, SOCK_STREAM, 0); bzero(&servaddr, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = htonl(INADDR_ANY); servaddr.sin_port = htons(8888); /* daytime server */ bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr)); listen(listenfd, LISTENQ); for(;;) { connfd = accept(listenfd, (struct sockaddr *)NULL, NULL); ticks = time(NULL); snprintf(buff, sizeof(buff), "%.24s\n", ctime(&ticks)); write(connfd, buff, strlen(buff)); close(connfd); }}
          
         
        
       
      
     
    
   

3. 运行log

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