UNIX 获取服务器时间服务器程序

#include	"unp.h"
#include	<time.h>

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);	/* daytime server */

	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);
	}
}

socket,bind,listen 三个函数创建监听描述符 一个客户端连接由accept返回一个已连接描述符 该服务请端需要在root权限下运行