daytimeser.c

来自「SUN Solaris8平台下进程间通信」· C语言 代码 · 共 55 行

#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include "err_exit.h"
#define LISTENQ  5
#define MAXLINE  512
int make_socket(unsigned short int);
int main(int argc, char **argv)
{
    int listenfd,connfd;
    socklen_t len;
    struct sockaddr_in servaddr,cliaddr;
    char buff[MAXLINE];
    time_t ticks;
    /* 创建并命名套接字，make_socket参见程序12－9 */
    listenfd = make_socket(13);   /* daytime 服务端口 */
    /* 创建侦听队列 */
    listen(listenfd, LISTENQ);
    /* 连接处理 */
    for(; ;){
        len = sizeof(cliaddr);
        /* 接收连接 */
        connfd = accept(listenfd, (struct sockaddr *)&cliaddr, &len);
        /* 打印出连接的客户是谁 */
        printf("connect from %s,port %d\n", 
            inet_ntoa(cliaddr.sin_addr.s_addr),ntohs(cliaddr.sin_port));
        /* 向客户报告时间 */
        ticks = time(NULL);
        sprintf(buff,"%.24s\r\n",ctime(&ticks));
        write(connfd,buff,strlen(buff));
        /* 关闭连接套接字 */
        close(connfd);
    }
}

int make_socket(unsigned short int port)
{
    int sock;
    struct sockaddr_in name;
    /* 创建套接字 */
    sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock < 0)
        err_exit("socket");
    /* 命名该套接字 */
    name.sin_family = AF_INET;
    name.sin_port = htons (port);
    name.sin_addr.s_addr = htonl (INADDR_ANY);
    if (bind(sock, (struct sockaddr *) &name, sizeof(name)) < 0)
        err_exit ("bind");
    return sock;
}