ex14_echoserv1.c

linux 高级编程的例子源码,包括了本书上的所有代码

/*filename :ex14_echoserv1.c*/
#include "ourhead.h"

int main(int argc,char **argv)
{
	int sockfd;
	struct sockaddr_in servaddr,cliaddr;
	int re;
	char buf[MAXLINE+1];
	int count;
	socklen_t clilen;

    sockfd=socket(AF_INET,SOCK_DGRAM,0);
	if (sockfd<0)
	{
        printf("can not create socket:%s\n",strerror(errno));
        exit(1);
	}
	bzero(&servaddr,sizeof(servaddr));
	servaddr.sin_family=AF_INET;
	servaddr.sin_port=htons(9999);
	servaddr.sin_addr.s_addr=htonl(INADDR_ANY);

	re=bind(sockfd,(struct sockaddr*)&servaddr,sizeof(servaddr));
    if (re<0)
    {
	    printf("can not bind address:%s\n",strerror(errno));
        exit(1);
    }
	for (;;)
	{
		clilen=sizeof(cliaddr);

		count=recvfrom(sockfd,buf,MAXLINE,0,&cliaddr,&clilen);
		if (count<0)
		{
		    printf("can not recv data:%s\n",strerror(errno));
            exit(1);
		}
		re=sendto(sockfd,buf,count,0,&cliaddr,clilen);
        if (re<0)
        {
		    printf("can not send data:%s\n",strerror(errno));
            exit(1);
       }
	}
	close(sockfd);
	exit(0);
  }