Why is not const used for parameters in the socket API?

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Why isn't const used in the socket API to make it clearer?
Example:
 
int sctp_sendmsg(int s, const void *msg, size_t len, struct sockaddr
*to,
                 socklen_t tolen, uint32_t ppid, uint32_t flags,
                 uint16_t stream_no, uint32_t timetolive, uint32_t
context);

If i am not missing something, i guess the "struct sockaddr *to" could
be const (that is: "const struct sockaddr *to").

Please use const for every paramater where it is possible. This makes
usage simpler. There are more functions than the (sctp_sendmsg) where
parameters can const.

/Roger
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