一个域名如果对应多个IP，那么实际访问这个域名会访问到哪个IP哪台服务器呢？

struct hostent *gethostbyname(const char *name);

struct hostent {
    char  *h_name;            /* official name of host */
    char **h_aliases;         /* alias list */
    int    h_addrtype;        /* host address type */
    int    h_length;          /* length of address */
    char **h_addr_list;       /* list of addresses */
}
define h_addr h_addr_list[0] /* for backward compatibility */

include 
include 
include 
include 

int main()
{
        struct hostent *host;
        struct in_addr h_addr;

        if ((host = gethostbyname("www.163.com")) != NULL) {
                h_addr.s_addr = *((unsigned long *) host->h_addr);
                printf("%s\n", inet_ntoa(h_addr));
        }
        return 0;
}