truct in_addr {
unsigned long s_addr; // that’s a 32-bit long, or 4 bytes
};
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struct sockaddr {
unsigned short sa_family; // address family, AF_xxx
char sa_data[14]; // 14 bytes of protocol address
};
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struct sockaddr_in {
short int sin_family; // Address family
unsigned short int sin_port; // Port number
struct in_addr sin_addr; // Internet address
unsigned char sin_zero[8]; // Same size as struct sockaddr
};
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#define h_addr h_addr_list[0] /*在h-addr-list中的第一个地址*/
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struct hostent {
char *h_name; /* 主机的官方域名 */
char **h_aliases; /* 一个以NULL结尾的主机别名数组 */
int h_addrtype; /* 返回的地址类型，在Internet环境下为AF-INET */
int h_length; /* 地址的字节长度 */
char **h_addr_list; /* 一个以0结尾的数组，包含该主机的所有地址*/
