请教：client&server通信出现地址占用问题？！

yi527

client:
int main( void )
{
        struct sockaddr_in peer;
        int s;
        int rc;
        char buf[ 20 ];

        peer.sin_family = AF_INET;
        peer.sin_port = htons( 7500 );
        peer.sin_addr.s_addr = inet_addr( "192.168.224.129" );

        s = socket( AF_INET, SOCK_STREAM, 0 );
rc = connect( s, ( struct sockaddr * )&peer, sizeof(peer ) );
        send( s, "client to server", 17, 0 );
       
        rc = recv( s, buf, 17, 0 );
        if ( rc <= 0 )
                perror( "recv call failed" );
        else
                printf( "%s\n", buf );
        exit( 0 );
}
##############################
server:

int main( void )
{
        struct sockaddr_in local;
        int s;
        int s1;
        int rc;
        char buf[ 20 ];

        local.sin_family = AF_INET;
        local.sin_port = htons( 7500 );
        local.sin_addr.s_addr = htonl( INADDR_ANY );
        s = socket( AF_INET, SOCK_STREAM, 0 );
        if ( s < 0 )
        {
                perror( "socket call failed" );
                exit( 1 );
        }
        rc = bind( s, ( struct sockaddr * )&local, sizeof( local ) );

        rc = listen( s, 5 );

        s1 = accept( s, NULL, NULL );

        rc = recv( s1, buf, 17, 0 );

        printf( "%s\n", buf );
        rc = send( s1, "server to client", 17, 0 );
        if ( rc <= 0 )
                perror( "send call failed" );
        memset( buf, 0, 20 );
        exit( 0 );
}
＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃
1，传送少量数据（比如client->;server 1,s->;c 2）时不会出问题
2,如上程序，第一次运行程序正确，第二次运行时报“bind call failure :address already in use”(在本机上，s后台运行)
请教各位这是什么道理，我已经memset( buf, 0, 20 )了？

酷于

close了套接字先```

yi527

我在server端加了close,但是问题依旧，