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Puzzle about sctp_bindx in UNP

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Old 08-20-2010
Question Puzzle about sctp_bindx in UNP
It writes in Section 9.3 in Unix Network programming about SCTP:
"The sctp_bindx call can be used on a bound or unbound socket."
And then it writes:
"The port number in all the socket address structures must be the same and must match any port number that is already bound; if it doesn't, then sctp_bindx will fail, returning the error code EINVAL."

It is easy to understand that the port number must be the same. What confuses me is that the port number must match any port number that is already bound. But previously it says that the sctp_bindx can be used on a unbound socket. I think that if the socket is unbound, the port number the socket will use must be unused as well. For example, assuming that a SCTP server wants to use port 123 to receive requests, the unbound SCTP socket will call sctp_bindx to bind itself to the port 123. Can it be done?
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LEARN ABOUT CENTOS

sctp_getladdrs

SCTP_GETLADDRS(3)					     Linux Programmer's Manual						 SCTP_GETLADDRS(3)

NAME

       sctp_getladdrs - Returns all locally bound addresses on a socket.

SYNOPSIS

       #include <sys/types.h>
       #include <sys/socket.h>
       #include <netinet/sctp.h>

       int sctp_getladdrs(int sd, sctp_assoc_t assoc_id,
			  struct sockaddr **addrs);

       void sctp_freeladdrs(struct sockaddr *addrs);

DESCRIPTION

       sctp_getladdrs  returns	all  locally  bound  addresses on a socket. On return, addrs will point to a dynamically allocated packed array of
       sockaddr structures of the appropriate type for each local address. The caller should use sctp_freeladdrs to free the memory. Note that the
       in/out parameter addrs must not be NULL.

       If sd is an IPv4 socket, the addresses returned will be all IPv4 addresses. If sd is an IPv6 socket, the addresses returned can be a mix of
       IPv4 or IPv6 addresses.

       For one-to-many style sockets, id specifies the association to query. For one-to-one style sockets, id is ignored.

       If the id field is set to 0, then the locally bound addresses are returned without regard to any particular association.

       sctp_freeladdrs frees all the resources allocated by sctp_getladdrs

RETURN VALUE

       On success, sctp_getladdrs returns the number of local addresses bound to the socket. If the socket is unbound, 0 is returned and the value
       of *addrs is undefined. On error, sctp_getladdrs returns -1 and the value of *addrs is undefined.

SEE ALSO

       sctp(7)	  sctp_bindx(3),   sctp_connectx(3),   sctp_sendmsg(3),   sctp_send(3),   sctp_recvmsg(3),   sctp_peeloff(3),	sctp_getpaddrs(3),
       sctp_opt_info(3),

Linux 2.6							    2005-10-25							 SCTP_GETLADDRS(3)