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NAME |SYNOPSIS |DESCRIPTION |RETURN VALUE |ERRORS |SEE ALSO |COLOPHON | |
SCTP_CONNECTX(3) Linux Programmer's ManualSCTP_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(intsd, struct sockaddr *addrs, intaddrcnt,sctp_assoc_t *id);
sctp_connectxinitiates a connection to a set of addresses passed in the arrayaddrs to/from the socketsd.addrcnt is the number of addresses in the array. Ifsd is an IPv4 socket, the addresses passed must be IPv4 addresses. Ifsd 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 withaddrcnt.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, anderrno is set appropriately.
EBADFsd is not a valid descriptor.ENOTSOCKsd is a descriptor for a file, not a socket.EFAULTError while copying in or out from the user address space.EINVALInvalid port or address.EACCESThe 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 toselect(2) orpoll(2) for completion by selecting the socket for writing. Afterselectindicates writability, usegetsockopt(2) to read theSO_ERRORoption at levelSOL_SOCKETto determine whetherconnectcompleted successfully (SO_ERRORis zero) or unsuccessfully (SO_ERRORis 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.EAGAINNo more free local ports or insufficient entries in the routing cache. ForPF_INETsee thenet.ipv4.ip_local_port_rangesysctl inip(7) on how to increase the number of local ports.EAFNOSUPPORT The passed address didn't have the correct address family in itssa_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 thelksctp-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 isnot part of the original manual page), send a mail to man-pages@man7.orgLinux 2.6 2005-10-25SCTP_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)
HTML rendering created 2025-09-06 byMichael Kerrisk, author ofThe Linux Programming Interface. For details of in-depthLinux/UNIX system programming training courses that I teach, lookhere. Hosting byjambit GmbH. | |