NAME

       sctp_connectx - initiate a connection on an SCTP socket using multiple destination addresses.

SYNOPSIS

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

       int sctp_connectx(int sd, struct sockaddr * addrs, int addrcnt,
                         sctp_assoc_t  * id);

DESCRIPTION

       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 IPv6 addresses.

       addrs  is  a  pointer  to  an  array  of  one  or more socket addresses. Each address is contained in its
       appropriate structure(i.e. struct sockaddr_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.

RETURN VALUE

       On success, 0 is returned. On failure, -1 is returned, and errno is set appropriately.

ERRORS

       EBADF  sd is not a valid descriptor.

       ENOTSOCK
              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.

       EISCONN
              The socket is already connected.

       ECONNREFUSED
              No one listening on the remote address.

       ETIMEDOUT
              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.

       ENETUNREACH
              Network is unreachable.

       EADDRINUSE
              Local address is already in use.

       EINPROGRESS
              The socket is non-blocking and the connection cannot be completed 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  completed  successfully (SO_ERROR is zero) or unsuccessfully (SO_ERROR is one of
              the usual error codes listed here, explaining the reason for the failure).

       EALREADY
              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.

       EAFNOSUPPORT
              The passed address didn't have the correct address family in its sa_family field.

       EACCES, EPERM
              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.

SEE ALSO

       sctp(7) sctp_bindx(3),  sctp_sendmsg(3),  sctp_sendv(3),  sctp_send(3),  sctp_recvmsg(3),  sctp_recvv(3),
       sctp_peeloff(3), sctp_getpaddrs(3), sctp_getladdrs(3), sctp_opt_info(3),