SCTP_CONNECTX(3) Linux Programmer's Manual SCTP_CONNECTX(3)
sctp_connectx - initiate a connection on an SCTP socket using multiple
int sctp_connectx(int sd, struct sockaddr * addrs, int addrcnt,
sctp_assoc_t * id);
sctp_connectx initiates a connection to a set of addresses passed in
the array addrs to/from the socket sd. addrcnt is the number of
addresses in the array.
If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
If sd is an IPv6 socket, the addresses passed can be either IPv4 or
addrs is a pointer to an array of one or more socket addresses. Each
address is contained in its appropriate structure(i.e. struct sock-
addr_in or struct sockaddr_in6). The family of the address type must be
used to distinguish the address length. The caller specifies the number
of addresses in the array with addrcnt.
id is a pointer to the association id and, if provided, will be set to
the identifier of the newly created association.
On success, 0 is returned. On failure, -1 is returned, and errno is set
EBADF sd is not a valid descriptor.
sd is a descriptor for a file, not a socket.
EFAULT Error while copying in or out from the user address space.
EINVAL Invalid port or address.
EACCES The address is protected, and the user is not the super-user.
The socket is already connected.
No one listening on the remote address.
Timeout while attempting connection. The server may be too busy
to accept new connections. Note that for IP sockets the timeout
may be very long when syncookies are enabled on the server.
Network is unreachable.
Local address is already in use.
The socket is non-blocking and the connection cannot be com-
pleted immediately. It is possible to select(2) or poll(2) for
completion by selecting the socket for writing. After select
indicates writability, use getsockopt(2) to read the SO_ERROR
option at level SOL_SOCKET to determine whether connect com-
pleted successfully (SO_ERROR is zero) or unsuccessfully
(SO_ERROR is one of the usual error codes listed here, explain-
ing the reason for the failure).
The socket is non-blocking and a previous connection attempt has
not yet been completed.
EAGAIN No more free local ports or insufficient entries in the routing
cache. For PF_INET see the net.ipv4.ip_local_port_range sysctl
in ip(7) on how to increase the number of local ports.
The passed address didn't have the correct address family in its
The user tried to connect to a broadcast address without having
the socket broadcast flag enabled or the connection request
failed because of a local firewall rule.
sctp(7) sctp_bindx(3), sctp_sendmsg(3), sctp_send(3), sctp_recvmsg(3),
sctp_peeloff(3), sctp_getpaddrs(3), sctp_getladdrs(3),
Linux 2.6 2005-10-25 SCTP_CONNECTX(3)
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