SCTP_CONNECTX(3) BSD Library Functions Manual SCTP_CONNECTX(3)NAMEsctp_connectx — connect an SCTP socket with multiple destination
Standard C Library (libc, -lc)
sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
The sctp_connectx() call attempts to initiate an association to a peer
SCTP endpoint. The call operates similarly to connect() but it also pro‐
vides the ability to specify multiple destination addresses for the peer.
This allows a fault tolerant method of initiating an association. When
one of the peers addresses is unreachable, the subsequent listed
addresses will also be used to set up the association with the peer.
The user also needs to consider that any address listed in an
sctp_connectx() call is also considered "confirmed". A confirmed address
is one in which the SCTP transport will trust is a part of the associa‐
tion and it will not send a confirmation heartbeat to it with a random
If the peer SCTP stack does not list one or more of the provided
addresses in its response message then the extra addresses sent in the
sctp_connectx() call will be silently discarded from the association. On
successful completion the provided id will be filled in with the associa‐
tion identification of the newly forming association.
The call returns 0 on success and -1 upon failure.
The sctp_connectx() function can return the following errors:
[EINVAL] An address listed has an invalid family or no
addresses were provided.
[E2BIG] The size of the address list exceeds the amount of
[EBADF] The argument s is not a valid descriptor.
[ENOTSOCK] The argument s is not a socket.
SEE ALSOconnect(2), sctp(4)BSD June 19, 2007 BSD