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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | SEE ALSO | COLOPHON |
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SCTP_CONNECTX(3) Linux Programmer's Manual SCTP_CONNECTX(3)
sctp_connectx - initiate a connection on an SCTP socket using
multiple destination addresses.
#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);
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.
On success, 0 is returned. On failure, -1 is returned, and errno
is set appropriately.
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.
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),
This page is part of the lksctp-tools (Linux kernel SCTP tools)
project. Information about the project can be found at [unknown
-- if you know, please contact man-pages@man7.org] If you have a
bug report for this manual page, send it to sctp@vger.kernel.org.
This page was obtained from the project's upstream Git repository
⟨https://github.com/sctp/lksctp-tools.git⟩ on 2025-08-11. (At
that time, the date of the most recent commit that was found in
the repository was 2024-09-26.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
Linux 2.6 2005-10-25 SCTP_CONNECTX(3)
Pages that refer to this page: sctp_bindx(3), sctp_getladdrs(3), sctp_getpaddrs(3), sctp_opt_info(3), sctp_peeloff(3), sctp_recvmsg(3), sctp_recvv(3), sctp_sendmsg(3), sctp_sendv(3), sctp(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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