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.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" From: @(#)send.2 8.2 (Berkeley) 2/21/94
.\" $FreeBSD$
.\"
.Dd June 18, 2011
.Dt SCTP_OPT_INFO 3
.Os
.Sh NAME
.Nm sctp_opt_info
.Nd get SCTP socket information
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/types.h
.In sys/socket.h
.In netinet/sctp.h
.Ft int
.Fn sctp_opt_info "int sd" "sctp_assoc_t id" "int opt" "void *arg" "socklen_t *size"
.Sh DESCRIPTION
The
.Fn sctp_opt_info
call provides a multi-os compatible method for getting
specific
.Fn getsockopt
data where an association identification needs to be passed
into the operating system.
For
.Fx
a direct
.Fn getsockopt
may be used, since
.Fx
has the ability to pass information
into the operating system on a
.Fn getsockopt
call.
Other operating systems may not have this ability.
For those
who wish to write portable code amongst multiple operating systems
this call should be used for the following SCTP
socket options.
.Pp
.Dv SCTP_RTOINFO
.Pp
.Dv SCTP_ASSOCINFO
.Pp
.Dv SCTP_PRIMARY_ADDR
.Pp
.Dv SCTP_PEER_ADDR_PARAMS
.Pp
.Dv SCTP_DEFAULT_SEND_PARAM
.Pp
.Dv SCTP_MAX_SEG
.Pp
.Dv SCTP_AUTH_ACTIVE_KEY
.Pp
.Dv SCTP_DELAYED_SACK
.Pp
.Dv SCTP_MAX_BURST
.Pp
.Dv SCTP_CONTEXT
.Pp
.Dv SCTP_EVENT
.Pp
.Dv SCTP_DEFAULT_SNDINFO
.Pp
.Dv SCTP_DEFAULT_PRINFO
.Pp
.Dv SCTP_STATUS
.Pp
.Dv SCTP_GET_PEER_ADDR_INFO
.Pp
.Dv SCTP_PEER_AUTH_CHUNKS
.Pp
.Dv SCTP_LOCAL_AUTH_CHUNKS
.Sh RETURN VALUES
The call returns 0 on success and -1 upon error.
.Sh ERRORS
The
.Fn sctp_opt_info
function can return the following errors:
.Bl -tag -width Er
.It Bq Er EINVAL
The argument
.Fa arg
value was invalid.
.It Bq Er EOPNOTSUPP
The argument
.Fa opt
was not one of the above listed SCTP socket
options.
.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 getsockopt 2 ,
.Xr sctp 4
.Sh BUGS
Because the structure used for
.Fa arg
of the
.Dv SCTP_MAX_BURST
socket option has changed in FreeBSD 9.0 and higher,
using
.Dv SCTP_MAX_BURST
as
.Fa opt
is only supported in FreeBSD 9.0 and higher.
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