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int getsockopt(int sock, int level, int optname, void *optval, socklen_t *optlen);
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struct sockaddr
{
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char sa_data[14]; //14×Ö½ÚÐÒ鵨ַ
};
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{
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};
struct in_addr
{
unsigned long s_addr; // that’s a 32-bit long, or 4 bytes
};
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