struct sockaddr_in - question

[Michael Bretterklieber]

Hi,

the struct sockaddr_in (netinet/in.h) of FreeBSD has the member sin_len, but other OS's don't have this structure-member. The sockaddr_in structure declared on many systems like this:
struct sockkaddr_in {
short int sin_family;
unsigned short int sin_port;
struct in_addr sin_addr;
}

My question is do I realy need to fill this? Or is it there just for future use?

bye,
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