Thread: Address family not supported by protocol in C socket programming in linux

Hi everyone, I am writing on C simple socket programs in Linux. I wrote client and server C programs. My client program is

Code:

#include<sys/socket.h>//for socket(), connect(), sendto() and recvform()

#include<sys/types.h>

#include<netinet/in.h>

#include<netdb.h>

#include<stdio.h>// for printf() and fprintf()

#include<string.h>//for memset()

#include<stdlib.h>//for atoi() and exit()

#include<unistd.h>//for close()

#include<errno.h>

#include<arpa/inet.h>//for sockaddr_in and inet_addr()

 


#define SERVERPORT 11000 

int main()

{

    
int sockfd  = 0;

    
struct sockaddr_in serv_addr;

    
if((sockfd=socket(AF_INET, SOCK_STREAM,0))< 0)

    {

        printf("Cannot create socket\n");
        
         return 1;

    }

    printf("Already create socket!!!\n");

    memset(&serv_addr, 0 , sizeof(serv_addr));

    serv_addr.sin_family = AF_INET;  //AF_INET is IP address family, Internet = IP addr 

    printf("Finished AF_INET\n"); 

    serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");  //sin_addr = ip addr

    printf("Finished inet_addr\n");

    serv_addr.sin_port = htons(11000);  //sin_port = tcp/ip port no        

    printf("Finished port\n");

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

    

    
if(connect(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr)) < 0) 

        {

            perror("Cannot connect\n");            

            exit (1);

        }

    
else

        printf("Connected\n");

}


　

and my server program is

Code:

#include<sys/socket.h>

#include<sys/types.h>

#include<netinet/in.h>

#include<netdb.h>

#include<stdio.h>

#include<string.h>

#include<stdlib.h>

#include <unistd.h>

#include<errno.h>

#include<arpa/inet.h>


int main()

{

    
int listenfd = 0;

    
struct sockaddr_in serv_addr;

    listenfd = socket(AF_INET, SOCK_STREAM, 0);

    

    
if (listenfd < 0)

    {

        printf("Cannot create socket\n");

        close(listenfd);

        
return 1;

    }

    printf("Already create socket!!!\n");

    serv_addr.sin_family = AF_INET;

    printf("Finished AF_INET\n");

    serv_addr.sin_addr.s_addr=htonl(INADDR_ANY);

    printf("Finished INADDR_ANY\n");

    serv_addr.sin_port = htons(11000);

    printf("Finished port\n");

    

    
if(bind (listenfd,(struct sockaddr *)&serv_addr, sizeof (serv_addr))<0)

    {

        printf("Cannot bind socket\n");

        close(listenfd);

        
           return 1;

    }

    

    

}

I am just testing whether can connect or not. I run server program first and client later. But when I run client, it showed that
"Address family not supported by protocol". Why is it so? if anyone knows it, pls kindly guide me. thanks

Look at this. Why is it so?

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Edit: Also, and especially, http://www.youtube.com/watch?v=4wzSKEruj70