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+.\" Copyright (c) 1983, 1991, 1993
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+.Dd February 2, 2024
+.Dt SCTP_BINDX 3
+.Os
+.Sh NAME
+.Nm sctp_bindx
+.Nd bind or unbind an SCTP socket to a list of addresses
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.In netinet/sctp.h
+.Ft int
+.Fn sctp_bindx "int s" "struct sockaddr *addrs" "int num" "int type"
+.Sh DESCRIPTION
+The
+.Fn sctp_bindx
+call binds or unbinds a address or a list of addresses to an
+SCTP endpoint.
+This allows a user to bind a subset of
+addresses.
+The
+.Fn sctp_bindx
+call operates similarly to
+.Fn bind
+but allows a list of addresses and also allows a bind or an
+unbind.
+The argument
+.Fa s
+must be a valid SCTP socket descriptor.
+The argument
+.Fa addrs
+is a list of addresses (where the list may be only 1 in
+length) that the user wishes to bind or unbind to the
+socket.
+The argument
+.Fa type
+must be one of the following values.
+.Pp
+.Dv SCTP_BINDX_ADD_ADDR
+This value indicates that the listed address(es) need to
+be added to the endpoint.
+.Pp
+.Dv SCTP_BINDX_REM_ADDR
+This value indicates that the listed address(es) need to
+be removed from the endpoint.
+.Pp
+Note that when a user adds or deletes an address to an
+association if the dynamic address flag
+.Va net.inet.sctp.auto_asconf
+is enabled any associations in the endpoint will attempt to
+have the address(es) added dynamically to the existing
+association.
+.Sh RETURN VALUES
+The call returns 0 on success and -1 upon failure.
+.Sh ERRORS
+The
+.Fn sctp_bindx
+function can return the following errors:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+This value is returned if the
+.Fa type
+field is not one of the allowed values (see above).
+.It Bq Er ENOMEM
+This value is returned if the number of addresses
+being added causes a memory allocation failure in
+the call.
+.It Bq Er EBADF
+The argument
+.Fa s
+is not a valid descriptor.
+.It Bq Er ENOTSOCK
+The argument
+.Fa s
+is not a socket.
+.El
+.Sh SEE ALSO
+.Xr bind 2 ,
+.Xr sctp 4
+.Rs
+.%A R. Stewart
+.%A M. Tuexen
+.%A K. Poon
+.%A P. Lei
+.%A V. Yasevich
+.%T Sockets API Extensions for the Stream Control Transmission Protocol (SCTP)
+.%R RFC 6458
+.%D December 2011
+.Re
+.Sh STANDARDS
+The
+.Fn sctp_bindx
+function conforms to RFC 6458.