Linux socket编程，connect失败.

[Mark_fish]

在VMWARE下进行的。server到listen 没有问题，client 在connect时候提示fail。可以ping通127.0.0.1 请大神帮忙看看

/* client */

#include<string.h>
#include<iostream>
#include<sys/types.h>
#include<sys/socket.h>
#include<stdlib.h>
#include<netinet/in.h>
#include<sys/time.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<sys/select.h>

#define PORT 6000
#define MAX_SIZE 1420
using namespace std;

void seconds_sleep(unsigned seconds){
    struct timeval tv;
    int errno;
    tv.tv_sec=seconds;
    tv.tv_usec=0;
    int err;
    do{
       err=select(0,NULL,NULL,NULL,&tv);
    }while(err<0 && errno==0);
}


int main()
{
	int confd;
	int recbytes;
	socklen_t sin_size;
	char send_buff[MAX_SIZE] = {0};
	char recv_buff[MAX_SIZE] = {0};
	char ntoa;
	struct sockaddr_in s_add , c_add ;
	timeval *begin;
	cout<<"Client start."<<endl;
	strcpy (send_buff,"Hi,I am mark. ");

	if ( confd = socket( AF_INET , SOCK_STREAM , 0) == -1 ) // create socket 
	{
		cout<<"Socket fail!"<<endl;
		return -1;
	}
	cout<<"Socket OK!"<<endl;
	
	bzero( &s_add , sizeof(struct sockaddr_in)); // init s_add
	s_add.sin_family = AF_INET ;
	s_add.sin_addr.s_addr = inet_addr("127.0.0.1");
	// ntoa = (s_add.sin_addr);
	s_add.sin_port = htons(PORT);
	cout<<"s_addr = "<<s_add.sin_addr.s_addr<<",port:"<<s_add.sin_port<<endl;	

	if (-1 == connect( confd , (struct sockaddr *)(&s_add),sizeof(struct sockaddr)))// connect
	{
		cout<<"connect fail!"<<endl;
		return -1;
	}	
	cout<<"Connected!"<<endl;		
	if ( -1 == send( confd , send_buff , MAX_SIZE , 0 ) ) // send
	{
		cout<<"Send fail!"<<endl;
		return -1;
	}
	if ( -1 == recv( confd , recv_buff , MAX_SIZE , 0 ) ) // recv		
	{
		cout<<"recv fail!"<<endl;
		return -1;
	}				
	recv_buff[MAX_SIZE-1] ='\0';
	cout<<"recv msg :"<<recv_buff<<endl; // output recv msg
	
	
	close(confd);

	return 0;	
}

/* server */

#include<string.h>
#include<iostream>
#include<sys/types.h>
#include<sys/socket.h>
#include<stdlib.h>
#include<netinet/in.h>
#include<sys/time.h>
#include<unistd.h>
#include<arpa/inet.h>

#define PORT 6000
#define MAX_SIZE 1420
#define back_log 1000  //max linking number	
using namespace std;
int main()
{
	int listenfd,confd; // sockfd
	struct sockaddr_in s_add,c_add;
	socklen_t sin_size;
	timeval *server_time;
	char send_buff[MAX_SIZE] = {0};
	char recv_buff[MAX_SIZE] = {0};
	strcpy(send_buff,"Welcome to mark's server!");	
	
	if ( (listenfd = socket(AF_INET,SOCK_STREAM,0)) == -1 )// create socket
	{
		cout<<"Socket fail!"<<endl;
		return -1;
	}
	cout << "Socket OK!"<<endl;	
	bzero(&s_add,sizeof(sockaddr_in));
	s_add.sin_family = AF_INET;// IPV4 
	s_add.sin_port = htons(PORT);   
	s_add.sin_addr.s_addr = htonl(INADDR_ANY);//   
	// s_add.sin_addr.s_addr = inet_addr("0.0.0.0");//   
	if (-1 == bind( listenfd , (struct sockaddr*)(&s_add) , sizeof(struct sockaddr)))// bind
	{
		cout<<"Bind port fail!"<<endl;
		return -1;	
	}
	cout<<"Bind port succeed!"<<endl;
	if (-1 == listen( listenfd , back_log ) )// listen
	{
		cout<<"Listen fail!"<<endl;
		return -1;
	}
	cout<<"Listen OK!"<<endl;
	// cout<<"s_addr = "<<s_add.sin_addr.s_addr<<",port:"<<s_add.sin_port<<endl;	
	while (true)
	{
		sin_size = sizeof(struct sockaddr_in);
		if ( ( confd = accept( listenfd , (struct sockaddr*)(&c_add) ,&sin_size )) == -1 )
		{
			cout<<"Accept fail!"<<endl;
			return -1;
		
			cout<<"Accepted!"<<endl;
			cout<<"connection from:"<<ntohl(c_add.sin_addr.s_addr)<<" port:"<<ntohs(c_add.sin_port)<<endl;
			gettimeofday(server_time,NULL);
			cout<<"Now time is:"<<server_time->tv_sec<<"s "<<server_time->tv_usec<<"us"<<endl;
			while (-1 != recv(confd,recv_buff,MAX_SIZE,0))
			{
				send(confd,send_buff,MAX_SIZE,0);
				recv_buff[MAX_SIZE-1] = '\0';
				cout<<"recv msg:"<<recv_buff<<endl;
			}		

		}
		close(confd);
	}



}	

[Mark_fish]

引用 1 楼 FightForProgrammer 的回复:

看看错误的返回值是什么，然后根据返回值的信息找到错误原因

ERRNO 88 /* Socket operation on non-socket */ 但是socket生成并没有什么问题。。。

[hanqingwu]

sin_size = sizeof(struct sockaddr_in); 不对 应该是 sizeof(struct sockaddr)

[FightForProgrammer]

看看错误的返回值是什么，然后根据返回值的信息找到错误原因

[YinPSoft]

客户端里这一段： if ( confd = socket( AF_INET , SOCK_STREAM , 0) == -1 ) // create socket { cout<<"Socket fail!"<<endl; return -1; } if条件中的写法导致confd最终是一个boolean值，不是socket fd 应该写成： if ( (confd = socket( AF_INET , SOCK_STREAM , 0)) == -1 ) { cout<<"Socket fail!"<<endl; return -1; }