iphone - bsd套接字连接超时iPhone

Question

如何编写指定 BSD 套接字 connect 系统调用超时的代码？我编写 iPhone 应用程序，需要等待很长时间才能从 connect 系统调用获得响应。有例子吗？ 谢谢

现在我有这样的东西:

host_name = NULL ;
host_name = gethostbyname([[host_value hostname] UTF8String]) ; 
if (host_name != NULL)
{
    struct sockaddr_in sin;
    sock = socket(AF_INET, SOCK_STREAM, 0);
    sin.sin_family = AF_INET;
    sin.sin_port = htons([[host_value port_number] intValue]);
    memcpy((char *)&sin.sin_addr,(char*)host_name->h_addr,host_name->h_length);
    if (connect(sock, (struct sockaddr*)(&sin),sizeof(struct sockaddr_in)) != 0) 
    {
       /* code */
    }
}

Answer 1

s = socket(AF_INET, SOCK_STREAM, 0);  
int x;
x=fcntl(s,F_GETFL,0);
fcntl(s,F_SETFL,x | O_NONBLOCK);

来自:http://rhoden.id.au/doc/sockets2.html