获取时间的小程序

来源：互联网发布：沙发推荐知乎编辑：程序博客网时间：2024/04/28 18:19

服务端：

#include<stdio.h>
#include<time.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<string.h>
#define LISTENQ 1024
#define SA struct sockaddr
#define MAXLINE 4096
int 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(13);
    bind(listenfd,(SA*)&servaddr,sizeof(servaddr));
    listen(listenfd,LISTENQ);
    for( ; ;){
        connfd=accept(listenfd,(SA*)NULL,NULL);
        ticks=time(NULL);
        snprintf(buff,sizeof(buff),"%.24s\r\n",ctime(&ticks));
        write(connfd,buff,strlen(buff));
         close(connfd);
            }
}

客户端：

#include<stdio.h>
#include<string.h>
#include<sys/socket.h>
#include<stdlib.h>
#include<netinet/in.h>
#define SA struct sockaddr
#define MAXLINE 2048
int main(int argc,char * *argv){
    int sockfd,n;
    char recvline[MAXLINE+1];
    struct sockaddr_in servaddr;
    if(argc!=2)printf("usage:a.out<IPaddress>");
    if((sockfd=socket(AF_INET,SOCK_STREAM,0))<0)printf("socket error");
    bzero(&servaddr,sizeof(servaddr));
    servaddr.sin_family=AF_INET;
    servaddr.sin_port =htons(13); //datime server
    if(inet_pton(AF_INET,argv[1],&servaddr.sin_addr)<=0)printf("inet_pton error for %s",argv[1]);
    if(connect(sockfd,(SA *)&servaddr,sizeof(servaddr))<0)printf("connect error");
    while((n=read(sockfd,recvline,MAXLINE))>0){
        recvline[n]=0; //null terminate
        if(fputs(recvline,stdout)==EOF)printf("fputs error");
    }
    if(n<0)printf("read error");
    exit(0);
}

注意事项：root权限 ,先客户端，再服务端

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