linux下socket编程调试connect出错问题

Toria2015 2012-07-31 11:02:40

服务器代码socket1.c

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/socket.h>

#include <sys/wait.h>

#define SERVPORT 2300 /*服务器监听端口号 */

#define BACKLOG 10 /*最大同时连接请求数 */

main(){

	int sockfd,client_fd;

	struct sockaddr_in my_addr;

	struct sockaddr_in remote_addr;

	if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1){

	perror("socket创建出错！");

	exit(1);

	}

	my_addr.sin_family=AF_INET;

	my_addr.sin_port=htons(SERVPORT);

	my_addr.sin_addr.s_addr=INADDR_ANY;

	bzero(&(my_addr.sin_zero),8);

	if(bind(sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))==-1){

		perror("bind出错！");

		exit(1);

	}

	if(listen(sockfd,BACKLOG)==-1)

	{

		perror("listen出错！");

		exit(1);

	}

	while(1){

		int sin_size=sizeof(struct sockaddr_in);

		if((client_fd=accept(sockfd,(struct sockaddr *)&remote_addr,&sin_size))==-1)

		{

			perror("accept出错！");

			continue;

		}

	printf("received a connection from %s",inet_ntoa(remote_addr.sin_addr));

	if(!fork()){

	if(send(client_fd,"Hello,you are connect!",26,0)==-1)

	perror("send出错！");

	close(client_fd);

	exit(0);

	}

	close(client_fd);

	}

}

客户端代码socket3.c

#include<stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <netdb.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/socket.h>

#define SERVPORT 2300

#define MAXDATASIZE 100 /*每次最大数据传输量 */

main(int argc, char *argv[]){

 int sockfd,recvbytes;

 char buf[MAXDATASIZE];

 struct hostent *host;

 struct sockaddr_in serv_addr;

 if(argc<2){

   fprintf(stderr,"Please enter the server's hostname!");

   exit(1);

 }

 if((host=gethostbyname(argv[1]))==NULL){

   perror("gethostbyname出错！");

   exit(1);

 }

 if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)

 {

   perror("socket创建出错！");

   exit(1);

 }

 serv_addr.sin_family=AF_INET;

 serv_addr.sin_port=htons(SERVPORT);

 serv_addr.sin_addr=*((struct in_addr*)host->h_addr);

 bzero(&(serv_addr.sin_zero),8);



 if(connect(sockfd,(struct sockaddr *)serv_addr,sizeof(struct sockaddr))==-1){

   perror("connect出错!");

   exit(1);

 }

 if((recvbytes=recv(sockfd,buf,MAXDATASIZE,0))==-1){

 perror("recv出错！");

 exit(1);

 }

 buf[recvbytes]='\0';

 printf("Received:%s",buf);

 close(sockfd);

}