Puzzle about sctp_bindx in UNP Post: 302446981

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Special Forums IP Networking Puzzle about sctp_bindx in UNP Post 302446981 by tomdean001 on Friday 20th of August 2010 10:37:19 AM

08-20-2010

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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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sctp_opt_info

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

NAME

       sctp_optinfo - Get options on a SCTP socket.

SYNOPSIS

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

       int sctp_opt_info(int sd, sctp_assoc_t id, int opt,
                         void * arg, socklen_t * size);

DESCRIPTION

       sctp_opt_info  is a wrapper library function that can be used to get SCTP level options on a socket.  sd is the socket descriptor for which
       the option is requested. For one-to-many style sockets, id specifies the association to query. For one-to-one style sockets, id is ignored.
       opt  specifes  the  SCTP  socket option to get.  arg is an option-specific structure buffer provided by the caller.  size is a value-result
       parameter, initially containing the size of the buffer pointed to by arg and modifed on return to indicate the actual  size  of  the  value
       returned.

RETURN VALUE

       On success, sctp_opt_info returns 0 and on failure -1 is returned with errno set to the appropriate error code.

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_getlad-
       drs(3),

Linux 2.6                                                           2004-01-30                                                    SCTP_OPT_INFO(3)